10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2022

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 001-38503

Iterum Therapeutics plc

(Exact name of Registrant as specified in its Charter)

Ireland	98-1283148
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

Fitzwilliam Court, 1st Floor,

Leeson Close,

Dublin 2, Ireland

(Address of principal executive offices)

Not applicable

(Zip Code)

(+353) 1 669-4820

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Ordinary Shares, $0.01 par value per share	ITRM	The Nasdaq Stock Market LLC

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes ☐ No ☒

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☒
		Emerging growth company	☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☒

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. Yes ☐ No ☒.

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. □

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to § 240.10D-1(b). □

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the Registrant, based on the closing price of the Registrant’s ordinary shares, $0.01 par value per share, on the Nasdaq Capital Market on June 30, 2022, the last business day of the Registrant’s most recently completed second fiscal quarter was $36.7 million.

The number of shares of Registrant’s ordinary shares outstanding as of February 28, 2023 was 12,705,961.

DOCUMENTS INCORPORATED BY REFERENCE

Part III of this Annual Report on Form 10-K incorporates by reference information from the definitive proxy statement for the Registrant’s 2023 Annual Meeting of Shareholders, which is expected to be filed with the Securities and Exchange Commission not later than 120 days after the Registrant’s fiscal year ended December 31, 2022.

Table of Contents

		Page
PART I
Item 1.	Business	1
Item 1A.	Risk Factors	36
Item 1B.	Unresolved Staff Comments	92
Item 2.	Properties	92
Item 3.	Legal Proceedings	92
Item 4.	Mine Safety Disclosures	93
PART II
Item 5.	Market for Registrant’s Common Equity, Related Shareholder Matters and Issuer Purchases of Equity Securities	94
Item 6.	[Reserved]	94
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	95
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	111
Item 8.	Financial Statements and Supplementary Data	112
Item 9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	145
Item 9A.	Controls and Procedures	145
Item 9B.	Other Information	145
Item 9C.	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	145
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	147
Item 11.	Executive Compensation	147
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters	147
Item 13.	Certain Relationships and Related Transactions, and Director Independence	147
Item 14.	Principal Accounting Fees and Services	147
PART IV
Item 15.	Exhibits, Financial Statement Schedules	148
Item 16	Form 10-K Summary	157

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS AND INDUSTRY DATA

This Annual Report on Form 10-K contains forward-looking statements that involve risks and uncertainties. All statements other than statements of historical facts contained in this Annual Report are forward-looking statements. In some cases, you can identify forward-looking statements by words such as “anticipate,” “believe,” “contemplate,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “seek,” “should,” “target,” “will,” “would,” or the negative of these words or other comparable terminology. These forward-looking statements include, but are not limited to, statements about:

•our use of cash reserves;

•the design, initiation, timing, progress and results of our preclinical studies and clinical trials, and our research and development programs including the ongoing Phase 3 clinical trial being conducted in response to the Complete Response Letter (CRL) received from the U.S. Food and Drug Administration in July 2021 in connection with our New Drug Application (NDA) for oral sulopenem;

•our ability to resolve the issues set forth in the CRL and resubmit our NDA;

•our ability to retain the continued service of our key professionals and to identify, hire and retain additional qualified professionals;

•our ability to advance product candidates into, and successfully complete, clinical trials;

•the potential advantages of our product candidates;

•the timing or likelihood of regulatory filings and approvals, including with respect to the potential resubmission of our NDA for oral sulopenem;

•the commercialization of our product candidates, if approved;

•our manufacturing plans;

•our sales, marketing and distribution capabilities and strategy;

•market acceptance of any product we successfully commercialize;

•the pricing, coverage and reimbursement of our product candidates, if approved;

•the implementation of our business model, strategic plans for our business and product candidates;

•the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates and our ability to defend and enforce any such intellectual property rights;

•our ability to enter into strategic arrangements, collaborations and/or commercial partnerships in the United States and other territories and the potential benefits of such arrangements;

•our estimates regarding expenses, capital requirements and needs for additional financing;

•our expectations regarding how far into the future our cash on hand will fund our ongoing operations;

•our financial performance;

•developments relating to our competitors and our industry;

•our ability to maintain compliance with listing requirements of the Nasdaq Capital Market; and

•the outcome, impact, effects and results of our evaluation of corporate, strategic, financial and financing alternatives, including the terms, timing, structure, value, benefits and costs of any corporate, strategic, financial or financing alternative and our ability to complete one at all.

These forward-looking statements are subject to a number of risks, uncertainties and assumptions, including those described in “Risk Factors” and elsewhere in this Annual Report. Moreover, we operate in a very competitive and rapidly changing environment, and new risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this Annual Report may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements.

You should not rely upon forward-looking statements as predictions of future events. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee that the future results, levels of activity, performance

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or events and circumstances reflected in the forward-looking statements will be achieved or occur. We undertake no obligation to update publicly any forward-looking statements for any reason after the date of this Annual Report to conform these statements to new information, actual results or to changes in our expectations, except as required by law.

You should read this Annual Report and the documents that we have filed with the Securities and Exchange Commission (SEC) as exhibits to this Annual Report with the understanding that our actual future results, levels of activity, performance, and events and circumstances may be materially different from what we expect.

This Annual Report also contains industry, market and competitive position data from our own internal estimates and research as well as industry and general publications and research surveys and studies conducted by third parties. Industry publications, studies, and surveys generally state that they have been obtained from sources believed to be reliable, although they do not guarantee the accuracy or completeness of such information. Our internal data and estimates are based upon information obtained from trade and business organizations and other contacts in the markets in which we operate and our management’s understanding of industry conditions. While we believe that each of these studies and publications is reliable, we have not independently verified market and industry data from third-party sources. While we believe our internal company research is reliable and the market definitions are appropriate, neither such research nor these definitions have been verified by any independent source. The industry in which we operate is subject to a high degree of uncertainty and risks due to various factors, including those described in the section titled “Summary of Risk Factors” and “Risk Factors.”

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this Annual Report, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements.

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SUMMARY OF RISK FACTORS

Below is a summary of the principal factors that make an investment in our ordinary shares speculative or risky. This summary does not address all of the risks that we face. Additional discussion of the risks summarized in this risk factor summary, and other risks that we face, can be found below in the “Risk Factors” section of this Annual Report on Form 10-K, and should be carefully considered, together with other information in this Annual Report on Form 10-K and our other filings with the SEC before making investment decisions regarding our ordinary shares. These risks include the following:

•We have incurred net losses in each year since our inception and anticipate that we will continue to incur significant losses unless we successfully commercialize our sulopenem program. As of December 31, 2022, we had an accumulated deficit of $422.9 million.

•We will require additional capital to fund our operations and may be unable to obtain financing when needed or on acceptable terms.

•In July 2021, we received a complete response letter (“CRL”) from the U.S. Food and Drug Administration (FDA) regarding our new drug application (“NDA”) for oral sulopenem for the treatment of uncomplicated urinary tract infections (uUTIs) in patients with a quinolone non-susceptible pathogen. In the CRL, the FDA determined that additional data are necessary to support approval for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone. The FDA recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. There can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing Phase 3 clinical trial intended to support a resubmission of our NDA or that any data generated by such clinical trial will be adequate to support resubmission or approval of our NDA.

•We are heavily dependent on the success of our sulopenem program, and our ability to develop, obtain marketing approval for and successfully commercialize oral sulopenem and sulopenem. If we are unable to obtain marketing approvals for oral sulopenem or sulopenem, or if thereafter we fail to commercialize oral sulopenem or sulopenem or experience significant delays in doing so, our business will be materially harmed.

•Our company has no experience in obtaining regulatory approval for a drug. If clinical trials of oral sulopenem, sulopenem or any other product candidate that we may advance to clinical trials fail to demonstrate safety and efficacy to the satisfaction of the FDA or comparable foreign regulatory authorities, or do not otherwise produce favorable results, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and commercialization of oral sulopenem, sulopenem or any other product candidate.

•Serious adverse events or undesirable side effects or other unexpected properties of oral sulopenem, sulopenem or any other product candidate may be identified during development or after approval that could delay, prevent or cause the withdrawal of regulatory approval, limit the commercial potential, or result in significant negative consequences following marketing approval.

•Even if a product candidate does obtain regulatory approval, it may never achieve the market acceptance by physicians, patients, hospitals, third-party payors and others in the medical community that is necessary for commercial success, and the market opportunity may be smaller than we estimate.

•We currently have no commercial organization. If we are unable to establish sales, marketing and distribution capabilities or enter into sales, marketing and distribution agreements with third parties, we may not be successful in commercializing oral sulopenem, sulopenem or any other product candidate if such product candidate is approved.

•We cannot predict whether bacteria may develop resistance to oral sulopenem or sulopenem, which could affect their revenue potential.

•We contract with third parties for the manufacture of preclinical and clinical supplies and expect to continue to do so in connection with any future commercialization and for any future clinical trials and commercialization of our product candidates and potential product candidates. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or such quantities at an acceptable cost, which could delay, prevent or impair our development or commercialization efforts.

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•We rely heavily on the exclusive license agreement with Pfizer Inc., or Pfizer, for the patent rights and know-how required to develop and commercialize sulopenem etzadroxil and the know-how required to develop the IV formulation of sulopenem. If we fail to comply with our obligations in our agreement with Pfizer, we could lose such rights that are important to our business.

•If we are unable to obtain and maintain patent protection or other intellectual property rights for oral sulopenem or our other technology and product candidates, or if the scope of the patent protection or intellectual property rights we obtain is not sufficiently broad, we may not be able to successfully develop or commercialize oral sulopenem or any other product candidates or technology or otherwise compete effectively in our markets.

•The volatility of our shares and shareholder base may hinder or prevent us from engaging in beneficial corporate initiatives. As our shareholder base is comprised of a large number of retail (or non-institutional) investors, this creates more volatility since shares change hands frequently. As a result, there can be a significant turnover of shareholders between the record date and the meeting date which makes it harder to get shareholders to vote. Failure to secure sufficient votes or to achieve the minimum quorum needed for a meeting to happen may impede our ability to move forward with initiatives that are intended to grow the business and create shareholder value or prevent us from engaging in such initiatives at all.

•We are currently limited in our authorized share capital and an increase in authorized shares will be required for future financings or other strategic transactions which requires shareholder approval. If we are unable to increase our authorized shares, we will be limited in our efforts to raise additional capital and/or could be required to settle any exchanges of our outstanding 6.500% Exchangeable Senior Subordinated Notes due 2025 with cash. As a result, our operations and financial condition may be materially and adversely affected.

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PART I

Item 1. Business.

Overview

We are a clinical-stage pharmaceutical company dedicated to developing and commercializing sulopenem to be potentially the first oral penem available in the United States and the first and only oral and intravenous (IV) branded penem available globally. Penems, including thiopenems and carbapenems, belong to a class of antibiotics more broadly defined as ß-lactam antibiotics, the original example of which was penicillin, but which now also includes cephalosporins. Sulopenem is a potent, thiopenem antibiotic delivered intravenously which is active against bacteria that belong to the group of organisms known as gram-negatives and cause urinary tract and intra-abdominal infections. We have also successfully developed sulopenem in an oral tablet formulation, sulopenem etzadroxil-probenecid, which we refer to as oral sulopenem. We believe that sulopenem and oral sulopenem have the potential to be important new treatment alternatives to address growing concerns related to antibacterial resistance without the known toxicities of some of the most widely used antibiotics, specifically fluoroquinolones.

During the third quarter of 2018, we initiated three clinical trials in our Phase 3 development program which included: a Phase 3 uncomplicated urinary tract infection (uUTI) clinical trial, known as Sulopenem for Resistant Enterobacteriaceae (SURE) 1, comparing oral sulopenem to oral ciprofloxacin in women with uUTI, a Phase 3 complicated urinary tract infection (cUTI) clinical trial known as SURE 2, comparing IV sulopenem followed by oral sulopenem to IV ertapenem followed by oral ciprofloxacin in adults with cUTI and a Phase 3 complicated intra-abdominal infection (cIAI) clinical trial known as SURE 3, comparing IV sulopenem followed by oral sulopenem to IV ertapenem followed by a combination of oral ciprofloxacin and oral metronidazole in adults with cIAI. We designed one Phase 3 clinical trial in each indication based on our end of Phase 2 meeting with the U.S. Food and Drug Administration (FDA) and feedback from the European Medicines Agency (EMA). We conducted the Phase 3 clinical trials under Special Protocol Assessment (SPA) agreements from the FDA. In December 2019, we announced that sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapy for the cIAI trial (SURE 3). In the second quarter of 2020, we announced the results of our Phase 3 clinical trials in cUTI (SURE 2) and uUTI (SURE 1). In the cUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapies with the difference in response rates driven almost entirely by higher rates of asymptomatic bacteriuria on the sulopenem IV to oral sulopenem arm relative to the ertapenem IV to oral ciprofloxacin arm, only evident at the test of cure visit. The rates of patients receiving additional antibiotics or with residual cUTI symptoms were similar between therapies. Similarly, in the uUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to ciprofloxacin in the population of patients with baseline pathogens susceptible to ciprofloxacin driven to a large degree by a greater amount of asymptomatic bacteriuria in the sulopenem treated patients at the test of cure visit relative to those receiving ciprofloxacin. However, in the uUTI trial, in the population of patients with baseline pathogens resistant to quinolones, sulopenem achieved the related primary endpoint by demonstrating statistical significance in the overall response rate by treatment arm in the ciprofloxacin-resistant population, providing evidence of a treatment effect in patients with uUTI. Based on discussions with the FDA at a pre-New Drug Application (NDA) meeting in September 2020 and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. We received a Complete Response Letter (CRL) from the FDA on July 23, 2021 in respect of our NDA. The CRL provided that the FDA had completed its review of the NDA and had determined that it could not approve the NDA in its present form. The CRL further provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REnewed ASsessment of Sulopenem in uUTI caused by Resistant Enterobacterales (REASSURE), in October 2022 and anticipate completing enrollment in the first half of 2024. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical Pharmacokinetics and Pharmacodynamics (PK/PD) studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem.

In November 2015, we acquired an exclusive, worldwide license under certain patents and know-how to develop and commercialize sulopenem and its oral prodrug, sulopenem etzadroxil, from Pfizer Inc. (Pfizer). Pfizer conducted Phase 1 and Phase 2 clinical trials of sulopenem delivered intravenously in Japan in over 1,450 patients with a variety of hospital and community acquired infections. These clinical trials documented a treatment effect in the indications studied and provided preliminary insights into the safety profile for sulopenem, which will continue to be assessed with additional clinical trials. Pfizer subsequently developed sulopenem into a prodrug formulation, sulopenem etzadroxil, to enable oral delivery. Once this prodrug is absorbed in the gastrointestinal tract, the etzadroxil ester is immediately cleaved off and the active moiety, sulopenem, is released into the bloodstream. We have further enhanced this prodrug formulation with the addition of probenecid to extend sulopenem’s half-life and enhance its antibacterial potential. Probenecid is a pharmacokinetic enhancer that has been safely and extensively used globally for

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decades. The oral dose of sulopenem etzadroxil-probenecid has been combined in a single bilayer tablet, which we refer to as oral sulopenem. We refer to sulopenem delivered intravenously as sulopenem and, together with oral sulopenem, as our sulopenem program.

The treatment of urinary tract and intra-abdominal infections has become more challenging because of the development of resistance by pathogens responsible for these diseases. There are approximately 15 million emergency room and office visits for symptoms of urinary tract infections (UTIs) and approximately 33 million uUTIs in the United States annually, with approximately 30% of those infections caused by a quinolone non-susceptible organism, and approximately 1% of infections are caused by pathogens that are resistant to all commonly available classes of oral antibiotics. Based on market research, physicians estimated that approximately 35% of these patients are at elevated risk for treatment failure. Proper antibiotic treatment of drug-resistant infections in this group is particularly important due to the risks associated with treatment failure. Elevated risk patients were defined in the research as patients with recurrent UTIs, elderly patients, patients who have a suspected or confirmed drug-resistant infection, patients with comorbidities (e.g., Diabetes mellitus) or that are immunocompromised, patients that have had a recent hospitalization, patients with a history of prior antibiotic failure and patients in a long-term care setting. Treatment failures pose significant clinical and economic challenges to the healthcare system. A recent retrospective database analysis of 5,395 evaluable outpatient UTI episodes revealed that 22% of patients received an antibiotic to which the pathogen was resistant in vitro, and those patients were almost twice as likely to require a second prescription (34% versus 19%) or be hospitalized (15% versus 8%) within 28 days of the initial prescription fill compared to patients who received an antibiotic to which the pathogen was susceptible. There are also approximately 3.6 million patients with cUTI and approximately 350,000 patients with cIAI that require antibiotic therapy every year in the United States.

Growing antibiotic resistance to E. coli, the primary cause of UTIs, has complicated the choice of treatment alternatives in both the community and hospital settings, reducing effective treatment choices for physicians. In addition, the Infectious Diseases Society of America and European Society for Microbiology and Infectious Diseases recommend against empiric use, or prescribing without results from a bacterial culture, of fluoroquinolones for uUTIs in their 2010 Update to the International Clinical Practice Guidelines for the Treatment of Acute Uncomplicated Cystitis and Pyelonephritis in Women. Similarly, the FDA in its November 2015 Advisory Committee meeting stated that the risk of serious side effects caused by fluoroquinolones generally outweighs the benefits for patients with uUTIs and other uncomplicated infections. Subsequently, the FDA mandated labeling modifications for fluoroquinolone antibiotics directing healthcare professionals to reserve fluoroquinolones for patients with no other treatment alternatives. In December 2018, the FDA further warned that fluoroquinolone antibiotics could cause aortic aneurysm and dissection in certain patients, especially older persons. In October 2018, the EMA’s pharmacovigilance risk assessment committee recommended restrictions on the use of broad-spectrum antibiotics, fluoroquinolones and quinolones, following a review of side effects that were reported to be “disabling and potentially long-lasting.” The committee further stated that fluoroquinolones and quinolones should only be used to treat infections where an antibiotic is essential, and others cannot be used.

None of the most commonly used oral antibiotics for treatment of uUTIs were initially approved by the FDA within the last two decades. We believe oral sulopenem will be an important treatment option for elevated risk uUTI patients because of its potency against resistant pathogens, as well as its spectrum of antibacterial activity. In addition, oral sulopenem will allow patients who develop an infection with a resistant pathogen but are stable enough to be treated in the community, to avoid the need for an IV catheter and even hospitalization.

In the hospital setting, the lack of effective oral stepdown options results in the potential for lengthy hospital stays or insertion of a peripherally inserted central catheter (PICC) to facilitate administration of IV antibiotics, even for some patients with relatively straightforward infections. Our sulopenem program may enable faster discharges, providing cost-saving advantages for the hospital and mitigating the risk of catheter-related infection for patients. Based on potency, safety and formulation advantages, we believe our sulopenem program is uniquely positioned to address unmet medical needs for patients suffering from uncomplicated and complicated infections in both the community and hospital settings.

If approved, we intend to commercialize our sulopenem program in the United States with a commercial partner and/or on our own with a targeted sales force in the community setting. Data from an ongoing epidemiology study to quantify quinolone resistance by zip code, in addition to data from our clinical trials and available prescriber data, will inform our initial targeted sales force as to where the medical need for a new, effective therapy for UTIs is highest in the community setting. Outside of the United States, we are evaluating our options to maximize the value of our sulopenem program.

We expect to register two suppliers and have validated one supplier for the manufacture of active pharmaceutical ingredient (API) for oral sulopenem at the time of a potential resubmission of our NDA. We will initially rely on a single third-party facility to manufacture all of our sulopenem tablets. In the future, given the importance of oral sulopenem to our potential commercial results, we will consider establishing additional sources.

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As of February 28, 2023, we exclusively license from Pfizer two U.S. patents and three foreign patents, including one U.S. patent directed to composition of matter of sulopenem etzadroxil, which is projected to expire in 2029, subject to potential extension under the Drug Price Competition and Patent Term Restoration Act of 1984, or Hatch-Waxman Act, to 2034, and three foreign patents related to sulopenem etzadroxil. We also own two U.S. patents, with one patent directed to the composition of the bilayer tablet of oral sulopenem and its related uses and the other directed to the method of use of oral sulopenem in treating multiple diseases, including uUTIs. Both patents are projected to expire in 2039, excluding any additional term for patent adjustments or patent term extensions. We also own three U.S. patent applications and twenty-seven foreign patent applications, which collectively cover uses of sulopenem and probenecid and bilayer tablets of sulopenem etzadroxil and probenecid. Any U.S. or foreign patents issuing from the pending applications are projected to expire between 2039 and 2041, excluding any additional term for patent adjustments or patent term extensions. In addition, the FDA has designated sulopenem and oral sulopenem as Qualified Infectious Disease Products (QIDP) for the indications of uUTI, cUTI, cIAI, community-acquired bacterial pneumonia, acute bacterial prostatitis, gonococcal urethritis, and pelvic inflammatory disease pursuant to the Generating Antibiotic Incentives Now Act (the GAIN Act). Fast track designation for these seven indications in both the oral and intravenous formulations has also been granted. QIDP status makes sulopenem and oral sulopenem eligible to benefit from certain incentives for the development of new antibiotics provided under the GAIN Act. Further, QIDP status could add five years to any regulatory exclusivity period that we may be granted. QIDP status for other indications is also possible given the coverage of gram-negative and gram-positive bacteria by sulopenem, pending submission of additional documentation and acceptance by the FDA. Fast track status provides an opportunity for more frequent meetings with the FDA, more frequent written communication related to the clinical trials, eligibility for accelerated approval and priority review and the potential for a rolling review. None of our licensed patents cover the IV formulation of sulopenem.

Sulopenem Program, Clinical and Regulatory Status

We pursued three initial indications for oral sulopenem and sulopenem in three Phase 3 clinical trials. We designed these Phase 3 clinical trials based on extensive in vitro microbiologic surveillance data, Phase 1 pharmacokinetic data from healthy volunteers as well as population pharmacokinetic data from patients, animal models in relevant disease settings, Phase 2 data from a program performed with sulopenem by Pfizer in Japan in the early 1990s, and regulatory feedback from the FDA at our end-of-Phase 2 meeting, all supported by an advanced commercial manufacturing program which provided clinical supplies.

During the third quarter of 2018, we initiated three clinical trials in our Phase 3 development program, being the SURE 1 trial, the SURE 2 trial and the SURE 3 trial. We designed one Phase 3 clinical trial in each indication based on our end of Phase 2 meeting with the FDA and feedback from the EMA. We conducted the Phase 3 clinical trials under SPA agreements from the FDA. In December 2019, we announced that sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapy for the cIAI trial (SURE 3). In the second quarter of 2020, we announced the results of our Phase 3 clinical trials in cUTI (SURE 2) and uUTI (SURE 1). In the cUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapies with the difference in response rates driven almost entirely by higher rates of asymptomatic bacteriuria on the sulopenem IV to oral sulopenem arm relative to the ertapenem IV to oral ciprofloxacin arm, only evident at the test of cure visit. The rates of patients receiving additional antibiotics or with residual cUTI symptoms were similar between therapies. Similarly, in the uUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to ciprofloxacin in the population of patients with baseline pathogens susceptible to ciprofloxacin driven to a large degree by a greater amount of asymptomatic bacteriuria in the sulopenem treated patients at the test of cure visit relative to those receiving ciprofloxacin. However, in the uUTI trial, in the population of patients with baseline pathogens resistant to quinolones, sulopenem achieved the related primary endpoint by demonstrating statistical significance in the overall response rate by treatment arm in the ciprofloxacin-resistant population, providing evidence of a treatment effect in patients with uUTI. Based on discussions with the FDA at a pre-NDA meeting in September 2020 and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. We received a CRL from the FDA on July 23, 2021 in respect of our NDA. The CRL provided that the FDA had completed its review of the NDA and had determined that it could not approve the NDA in its present form. The CRL further provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone, and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem.

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Our Strategy

Our strategy is to develop and commercialize our sulopenem program for multiple indications, and in the long term to build a market-leading anti-infective business. The key elements of this strategy include the following:

•Obtain regulatory approval for oral sulopenem in the United States. Complete the ongoing REASSURE trial to support the resubmission of our NDA to the FDA for oral sulopenem.

•Consider regulatory strategy outside the United States. We are considering the timing of a potential submission of a Marketing Authorization Application (MAA) to the EMA.

•Maximize commercial potential of our sulopenem program. If approved, we intend to seek a commercial partner and/or directly commercialize oral sulopenem in the United States with a targeted sales force in the community setting. Outside of the United States, we are evaluating our options to maximize the value of our sulopenem program.

•Pursue the development of oral sulopenem and sulopenem in additional indications. In the future, we may also pursue development of our sulopenem program in additional indications in adults and children, including cUTIs, community acquired bacterial pneumonia, non-tuberculous mycobacterial pulmonary disease, cIAIs, bacterial prostatitis, gonorrhea, diabetic foot infection and bone and joint infection, as well as new formulations to support these indications.

•Build a portfolio of differentiated anti-infective products. We intend to enhance our product pipeline through strategically in-licensing or acquiring clinical stage product candidates or approved products for the community and/or hospital and acute care markets. We believe that our focus on acute care in both the community and hospital markets will make us an attractive partner for companies seeking to out-license products or product candidates in our areas of focus.

The Medical Need

Urinary Tract and Intra-Abdominal Infections

UTIs are among the most common bacterial infections encountered in the ambulatory setting. A UTI occurs when one or more parts of the urinary system (kidneys, ureters, bladder or urethra) become infected with a pathogen (most frequently, bacteria). While many UTIs are not considered life-threatening, if the infection reaches the kidneys, serious illness, and even death, can occur. UTI diagnoses are stratified between either complicated or uncomplicated infections. uUTI refers to the invasion of a structurally and functionally normal urinary tract by a nonresident infectious organism (e.g., acute cystitis), and is diagnosed and commonly treated in an outpatient setting with an oral agent. Conversely, cUTIs, including acute pyelonephritis, are defined as a UTI ascending from the bladder accompanied by local and systemic signs and symptoms, including fever, chills, malaise, flank pain, back pain, and/or costo-vertebral angle pain or tenderness, that occur in the presence of a functional or anatomical abnormality of the urinary tract or in the presence of catheterization, with treatment typically initiated by IV therapy in a hospital setting.

cIAIs have similar challenges to those of cUTIs. These complicated infections extend from a gastrointestinal source, such as the appendix or the colon, into the peritoneal space and can be associated with abscess formation.

Antimicrobial Resistance is Increasing

E. coli is growing increasingly resistant to many classes of antibiotics, which is especially problematic for patients suffering from UTIs because E. coli is the primary cause of those infections. The market-leading antibiotics, fluoroquinolones (e.g., Cipro, Levaquin) and trimethoprim-sulfamethoxazole (e.g., Bactrim, Septra), currently have E. coli resistance rates over 20% nationally. In 2019, approximately 40% of oral prescriptions for UTIs written in the United States were for fluoroquinolones or trimethoprim-sulfamethoxazole. In hospitals, fluoroquinolones have greater than 30% resistance to E. coli in approximately half the states in the United States, and have greater than 25% resistance rates in nearly 80% of the states. According to national data published by the Centers for Disease Control and Prevention (CDC), fluoroquinolones had greater than 33% resistance to E. coli in the United States in 2019 in hospitalized patients, and in 2020, the national resistance rate of E. coli to fluoroquinolones increased to 35.2%. Further, the national resistance rate of E. coli to cephalosporins, which is a common marker for extended spectrum ß-lactamases (ESBL)-producing E. coli, was estimated to be approximately 13% for the combined years of 2011 to 2015, and in 2020, and the resistance rate to cephalosporins was reported to be 24.7% by the CDC. Between 2000 and 2009 the prevalence of extended spectrum ß-lactamases (ESBL)-producing E. coli and ESBL-producing K. pneumoniae more than doubled from 3.3% to 8.0% and from 9.1% to 18.6%, respectively. During the same timeframe, hospitalizations caused by ESBL-producing organisms increased by about 300%.

We have further delineated the prevalence of bacterial resistance to antibiotics used to treat UTIs in the United States. Based on urine culture results obtained at the zip code level from outpatient UTIs, we concluded that the prevalence of resistance of Enterobacteriaceae to quinolone antibiotics is over 20% in a significant portion of the country. In addition, in 2015, 25 states identified as high prevalence for E. coli resistance produced approximately 75% of all UTI prescriptions in the United States.

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Geographic prevalence of quinolone non-susceptible Enterobacteriaceae by zip code in outpatient
urine cultures.

 

Numbers represent hospital centers from which data were derived

As antibiotic resistance leads to increased costs of treatment and increased morbidity, as well as increased mortality, there is an urgent unmet medical need for antimicrobial agents that can be utilized in community and hospital infections. A recent nationwide database study that evaluated trends in antibiotic resistance in urinary Enterobacterales isolates from ambulatory patients in the United States revealed that antimicrobial resistance was common in urinary Enterobacterales isolates. Isolates with an ESBL-producing phenotype increased by about 30% between 2011 and 2020, and significant increases were also observed in nitrofurantoin non-susceptible Enterobacterales isolates. Resistance rates for all four antibiotic classes (fluoroquinolones, trimethoprim-sulphamethoxazole, nitrofurantoin and β-lactams), were higher than thresholds recommended for use as empiric therapy. The antimicrobial class of penems has the potential to address many of the relevant resistance issues associated with ß-lactam antibiotics because of a targeted spectrum of antibacterial activity and intrinsic stability against hydrolytic attack by many ß-lactamases, including ESBL and AmpC enzymes.

There is a Significant Population at Risk

There are approximately 15 million emergency room and office visits for symptoms of UTIs and approximately 33 million uUTIs in the United States annually with approximately 30% of those infections caused by a quinolone non-susceptible organism, and approximately 1% of infections are caused by pathogens that are resistant to all commonly available classes of oral antibiotics. Based on market research, physicians estimated that approximately 35% of these patients are at elevated risk for treatment failure. Proper antibiotic treatment of drug-resistant infections in this group is particularly important due to the consequences associated with treatment failure. Elevated risk patients were defined in the research as patients with recurrent UTIs, elderly patients, patients who have a suspected or confirmed drug-resistant infection, patients with comorbidities (e.g., Diabetes mellitus) or that are immunocompromised, patients that have had a recent hospitalization, patients with a history of prior antibiotic failure and patients in a long-term care setting.

There are also approximately 3.6 million patients with cUTI and approximately 350,000 patients with cIAI that require antibiotic therapy every year in the United States.

Limited Treatment Options

In addition to worsening antibiotic resistance, many of the antibiotics currently used for first-line empiric oral treatment of uUTIs, such as nitrofurantoin and trimethoprim-sulfamethoxazole, suffer from significant safety and tolerability concerns. Pulmonary fibrosis and diffuse interstitial pneumonitis have been observed in patients treated with nitrofurantoin, which is contraindicated in pregnant women after 38 weeks of gestation and newborn children due to hemolytic anemia and in patients with poor renal function. Trimethoprim-sulfamethoxazole is associated with fatal hypersensitivity reactions, embryofetal toxicity, hyperkalemia, gastrointestinal disturbances and rashes, including rare cases of Stevens-Johnson Syndrome. In addition, some antibiotics, such as nitrofurantoin and fosfomycin, have poor tissue penetration. While fluoroquinolones are now the most widely used antibiotic class in

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treating community and hospital gram-negative infections, the Infectious Diseases Society of America and the European Society for Microbiology and Infectious Diseases now recommend against empiric use of fluoroquinolones for uUTIs in their 2010 Update to the International Clinical Practice Guidelines for the Treatment of Acute Uncomplicated Cystitis and Pyelonephritis in Women as they “have a propensity for collateral damage and should be reserved for important uses other than acute cystitis and thus should be considered alternative antimicrobials for acute cystitis.” Similarly, the FDA in its November 2015 Advisory Committee meeting stated that the risk of serious side effects caused by fluoroquinolones generally outweighs the benefits for patients with uUTIs and other uncomplicated infections. Serious side effects associated with fluoroquinolones include tendon rupture, tendinitis, and worsening symptoms of myasthenia gravis and peripheral neuropathy. Subsequently, the FDA mandated labeling modifications for fluoroquinolones antibiotics directing healthcare professionals to reserve fluoroquinolones for patients with no other treatment alternatives. In December 2018 the FDA further warned that fluoroquinolone antibiotics could cause aortic aneurysm and dissection in certain patients, especially older persons. In October 2018, the EMA’s pharmacovigilance risk assessment committee recommended restrictions on the use of broad-spectrum antibiotics, fluoroquinolones and quinolones, following a review of side effects that were reported to be “disabling and potentially long-lasting”. The committee further stated that fluoroquinolones and quinolones should only be used to treat infections where an antibiotic is essential, and others cannot be used.

The limited oral antibiotic treatment options for patients with uUTIs can sometimes result in hospitalization to facilitate administration of IV antibiotics for patients whose infection progresses. In addition, some patients whose uUTI remains uncomplicated may require hospital admission for IV therapy. For patients with cUTIs, the lack of effective oral stepdown options, and the paucity of new treatment options, which is demonstrated by the fact that none of the most commonly used oral agents were initially approved by the FDA in the last two decades, results in the potential for lengthy hospital stays or insertion of a PICC to facilitate administration of IV antibiotics, even for some patients with relatively straightforward infections. Therefore, based both on the epidemiology described above and recent discussions with practicing clinicians and pharmacists, we believe there is a pressing need for a novel oral antibacterial therapy for UTI, both complicated and uncomplicated, that has potent activity against ESBL producing and quinolone resistant gram-negative organisms.

The Challenge of Developing Antibiotics

Antibiotics work by targeting a critical function of the bacteria and rendering it non-functional. These critical functions include the ability to make proteins, to replicate further, and to build protective envelopes against the harsh external environment. These functions are coded in the bacteria’s DNA, which is copied over to each generation. Occasionally errors are made in the copying; typically, these errors kill off the progeny but can sometimes actually help them survive under specific circumstances, namely when threatened by an antibiotic.

Bacterial mutations, these changes in DNA coding, allow the organism to adapt their protein structures so as to prevent target-specific antibiotics from working. Over time, subsequent generations of bacteria retain these mutations and even develop additional mutations making them resistant to multiple classes of antibiotics and generating what is known as multi-drug resistant (MDR) pathogens. Furthermore, bacteria have also developed mechanisms that allow them to pass these genetic mutations directly to other nearby bacteria, even those from a different species. As there are a limited number of antibiotic classes available today, there is a concern that eventually we will not have any antibiotics to treat patients who develop an infection caused by these MDR bacteria. We continue to need new antibiotics that stay one step ahead of these mutating bacteria in order to protect against the infections that they cause.

The Solution to Rising Resistance

The solution to the problem of resistance is based on strategies to use those antibiotics only when patients really need them, limiting the number of opportunities for the bacteria to develop these mutations, and to continue efforts aimed at the discovery and development of new and effective antibacterial agents.

These new agents will need to:

•kill the organisms responsible for the actual infection;

•target a specific bacterial function and overcome the existing resistance mechanisms around that function;

•be powerful enough to require a minimal amount of drug to kill the organism at the site of infection; and

•be delivered to a patient in a manner which is safe, tolerable and convenient.

For the last thirty years, the penem class of antibiotics, including carbapenems such as imipenem, meropenem, doripenem and ertapenem, have been potent and reliable therapeutic options for patients with serious infections. Their spectrum of activity includes those pathogens responsible for infections such as those in the intra-abdominal space, urinary tract, and respiratory tract with a

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potency as good or better than any other antibiotic class, targeting the cell wall of bacteria, a critical element of bacterial defense. Resistance to the class, generally caused by organisms which have acquired a carbapenemase, is rarely, if ever, seen in the community setting and is primarily localized to patients with substantial healthcare exposures, particularly recent hospitalizations. These drugs are generally very well tolerated. Their limitation is the requirement to be delivered intravenously, restricting their utility to hospitalized patients.

Our Sulopenem Program

Our sulopenem program has the potential to offer a solution to the problem of antibiotic resistance and the limitations of existing agents. Sulopenem has in vitro activity against gram-negative organisms with resistance to one or more established antibiotics and can be delivered in an oral formulation. If a UTI occurs in the community setting, oral sulopenem can be provided as a tablet, offering an option for care of those with a culture proven or suspected MDR pathogen, potentially avoiding the need for hospitalization. If a patient requires hospitalization for an infection due to a resistant organism, treatment can be initiated intravenously with sulopenem and once the infection begins to improve, stepped down to oral sulopenem, potentially enabling the patient to leave the hospital.

Potential Advantages of Oral Sulopenem and Sulopenem

We are developing our sulopenem program to offer patients and clinical care providers a new option to treat drug-resistant gram-negative infections with confidence in its antimicrobial activity, and the flexibility to treat patients in the community while getting those hospitalized back home.

Sulopenem’s differentiating characteristics include:

•Activity as an oral agent and favorable pharmacokinetic profile. Sulopenem is the active moiety with antibacterial activity. Oral sulopenem is a prodrug specifically selected among many other prodrug candidates because it enables the absorption of sulopenem from the gastrointestinal tract. It is this oral agent, sulopenem etzadroxil, combined with probenecid that we believe meets an urgent medical need to allow patients with resistant pathogens to be treated safely in the community, as well as allowing hospitalized patients to continue their treatment at home. Oral sulopenem is sufficiently absorbed from the gastrointestinal tract to allow the parent compound, sulopenem, to achieve adequate exposure in the tissues and, as demonstrated in animal models, to significantly reduce the burden of offending pathogens. Based on pharmacokinetic modeling we believe dosing of the oral agent twice daily will provide tissue exposure sufficient to resolve clinical infection.

•Targeted spectrum of activity against relevant pathogens without pressure on other incidental gram-negative organisms. Sulopenem is active against the pathogens that are most likely to cause infection of the urinary and gastrointestinal tract, including E. coli, K. pneumoniae, P. mirabilis and B. fragilis. Like ertapenem, sulopenem is not active against certain gram-negative organisms such as Pseudomonas aeruginosa and Acinetobacter baumannii. These organisms are not typically seen in community UTIs and are infrequently identified in UTIs in the hospital, except when patients have had an indwelling urinary catheter for an extended duration. As a result, we believe the targeted spectrum of sulopenem is less likely to put pressure on those pathogens which could otherwise have led to carbapenem resistance.

•Activity against multidrug resistant pathogens. Bacteria are accumulating resistance mechanisms to multiple classes of antibiotics within the same organism, and, as a consequence, physicians are losing confidence in existing antibiotics as empiric therapy before culture results become available. Sulopenem is active against organisms that have multiple resistance mechanisms and can help avoid some of the consequences of ineffective antibiotic therapy.

•Documented safety and tolerability profile. In our completed Phase 3 program, sulopenem IV and oral sulopenem were well tolerated. In the cIAI clinical trial, among the 668 patients treated, treatment-related adverse events were observed in 6.0% and 5.1% of patients on sulopenem and ertapenem, respectively, with the most commonly reported drug-related adverse event being diarrhea, which was observed in 4.5% and 2.4% of patients on sulopenem and ertapenem, respectively. Discontinuations from treatment were uncommon for both regimens, occurring in 1.5% of patients on sulopenem and 2.1% of patients on ertapenem. Serious adverse events unrelated to study treatment were seen in 7.5% of patients on sulopenem and 3.6% of patients on ertapenem. In the cUTI trial, patients received either sulopenem IV followed by sulopenem etzadroxil, if eligible for oral therapy, or ertapenem IV followed by ciprofloxacin or amoxicillin-clavulanate, if eligible for oral therapy. Among 1,392 treated patients, treatment-related adverse events were observed in 6.0% and 9.2% of patients on sulopenem and ertapenem, respectively, with the most commonly reported adverse events being headache (3.0% and 2.2%), diarrhea (2.7% and 3.0%) and nausea (1.3% and 1.6%), on sulopenem and ertapenem, respectively. Discontinuations from treatment were uncommon for both regimens, occurring in 0.4% of patients on sulopenem and 0.6% of patients on ertapenem. Serious adverse events unrelated to study treatment were seen in 2.0% of patients on sulopenem and 0.9% of patients on ertapenem. In the uUTI trial, patients received either oral sulopenem or ciprofloxacin. Among 1,660 treated patients, treatment related adverse events were observed in 17.0% and 6.2% of patients on sulopenem and ciprofloxacin, respectively. The most commonly reported adverse events were diarrhea (12.4% and 2.5%), nausea (3.7% and 3.6%), and headache (2.2% and

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2.2%), for sulopenem and ciprofloxacin patients, respectively. The difference in adverse events was driven by diarrhea which, in the majority of patients, was mild and self-limited. Overall discontinuations due to adverse events were uncommon on both regimens and were seen in 1.6% of patients on sulopenem and 1.0% of patients on ciprofloxacin. Serious adverse events were seen in 0.7% of patients on sulopenem with one drug-related serious adverse event due to transient angioedema and 0.2% of patients on ciprofloxacin with no drug-related serious adverse event.

•Availability of an IV formulation. Patients sick enough to require hospitalization may not be good candidates for initial oral therapy given potential uncertainties around the ability to absorb drugs due to diminished gastrointestinal and target tissue perfusion in patients with compromised cardiovascular status associated with sepsis or reduced gastrointestinal motility. An IV and oral formulation will enable the conduct of clinical registration trials in a manner consistent with typical clinical practice, allow for confidence in the initiation of therapy in seriously ill patients and, if approved, offer both important formulations as therapeutic options.

•Advanced manufacturing program. The synthetic pathway for sulopenem, initially defined in the 1980s, has now evolved through its third iteration, incorporating improvements in yield and scalability. We plan to register two different contract manufacturing organizations to manufacture the API for oral sulopenem. One manufacturer has completed process validation for oral sulopenem to date providing sufficient API for clinical supplies and commercial launch if oral sulopenem is approved for marketing. We will initially rely on a single third-party facility to manufacture all of our sulopenem tablets. In the future, given the importance of sulopenem to our potential commercial results, we will consider establishing additional sources.

Market Opportunity for Oral Sulopenem and Sulopenem

Based upon the clinical evidence to date in eradicating key pathogens, coupled with unmet medical need, if approved, we expect the commercial opportunity for oral sulopenem to be substantial with initial focus on the treatment of uUTIs in elevated risk patients caused by drug-resistant pathogens in the community. We estimate that approximately 30% of uUTIs in the United States are caused by quinolone non-susceptible pathogens, and approximately 1% of infections are caused by pathogens that are resistant to all commonly available classes of oral antibiotics.

Acute cystitis remains one of the most common indications for prescribing antimicrobials to otherwise healthy women, resulting in as many as 15 million office or emergency room visits in the United States annually, according to a review published in 2015. Up to 50% of all women experience one episode by 32 years of age. In addition, there are approximately 3.6 million patients a year in the United States for the more serious cases of cUTI.

In the United States, E. coli resistance presently exceeds 20% for fluoroquinolones, trimethoprim-sulfamethoxazole and ampicillin. Our market research indicated that physicians identified the lack of effective oral agents for these more difficult drug-resistant infections as a key unmet need in their practice. Physicians are particularly concerned by drug-resistant infections in the 35% of patients considered to be at elevated risk for treatment failure, as they pose significant potential clinical and economic challenges to the healthcare system when initial therapy is unsuccessful.

Given the growing prevalence of bacterial resistance that has rendered existing oral therapies ineffective, coupled with the FDA mandating new safety labeling changes to enhance warnings limiting fluoroquinolone use in uncomplicated infections due to the association with disabling and potentially permanent side effects, physicians are seeking new alternatives to safely and effectively treat their patients.

We believe oral sulopenem’s value proposition will aid physicians in the community setting to address the unmet need for a safe and effective oral uUTI therapy to treat the growing number of patients with suspected or confirmed resistant pathogen(s). In addition, we believe our sulopenem program will offer a compelling value proposition to hospitals by enabling the transition of patients from IV therapy in the inpatient setting to an oral therapy in the community.

Oral Sulopenem and Sulopenem Clinical Development Program

The objective of our sulopenem program is to deliver to patients an oral and IV formulation of sulopenem approved in the United States and Europe for the treatment of infections due to resistant gram-negative pathogens. Sulopenem’s spectrum of activity, the availability of an oral agent delivered in a convenient dosing schedule and the evolving safety profile supported its further development for the target indications of uUTI, cUTI and cIAI. Oral sulopenem is the oral prodrug metabolized to sulopenem, its therapeutically active form, combined with probenecid.

Both sulopenem and oral sulopenem have received QIDP designation status for the indications of uUTI, cUTI and cIAI as well as for community-acquired bacterial pneumonia, acute bacterial prostatitis, gonococcal urethritis, and pelvic inflammatory disease. Fast track designation for these seven indications in both the oral and intravenous formulations has also been granted. QIDP designation status for other indications is also possible given the coverage of gram-negative and gram-positive bacteria by sulopenem, pending submission of additional documentation and acceptance by the FDA. We had received feedback on the development program in an end of Phase 2 meeting with the FDA, which provided guidance on the size of the safety database, the non-clinical study

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requirements, the design of the Phase 1 and Phase 3 clinical trials, the pediatric development plan, as well as support for the proposed chemistry, manufacturing, and controls (CMC) development activities through production of commercial supplies. The Phase 3 clinical trials for treatment of cIAI, cUTI and uUTI received SPA agreements with the FDA. All three Phase 3 clinical trials were initiated in the third quarter of 2018 and completed enrollment by the end of 2019. In December 2019, we announced that sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapy for the cIAI trial. EMA Scientific Advice received by us, consistent with the existing guidance for this indication, supports an endpoint assessed earlier than the primary study endpoint and a non-inferiority margin of -12.5%. In the second quarter of 2020, we announced the results of our Phase 3 clinical trials in cUTI and uUTI. In the cUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapies, with the difference in response rates driven almost entirely by higher rates of asymptomatic bacteriuria on the sulopenem IV to oral sulopenem arm relative to the ertapenem IV to oral ciprofloxacin arm, only evident at the test of cure visit. The rates of patients receiving additional antibiotics or with residual cUTI symptoms were similar between therapies. Similarly, in the uUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to ciprofloxacin in the population of patients with baseline pathogens susceptible to ciprofloxacin, driven to a large degree by a greater amount of asymptomatic bacteriuria in the sulopenem treated patients at the test of cure visit relative to those receiving ciprofloxacin. However, in the uUTI trial, in the population of patients with baseline pathogens resistant to quinolones, sulopenem achieved the related primary endpoint by demonstrating superiority to ciprofloxacin, providing evidence of a treatment effect in patients with uUTI. Notwithstanding failure to meet the endpoints described above, in all three Phase 3 clinical trials, at all timepoints measured, the clinical response to sulopenem and/or oral sulopenem was similar to the comparator regimen (non-inferior), except in the instance of the quinolone non-susceptible population in the Phase 3 uUTI trial in which oral sulopenem was statistically superior. Further, we believe the secondary supporting analyses and safety data support the potential of sulopenem in the treatment of multi-drug resistant infections. Based on discussions with the FDA at a pre-NDA meeting in September 2020 and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. As described above, we received a CRL from the FDA on July 23, 2021 in respect of our NDA. The CRL provided that the FDA had completed its review of the NDA and had determined that it could not approve the NDA in its present form. The CRL further provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem.

Microbiology Surveillance Data

Sulopenem has demonstrated potent in vitro activity, as defined by its minimum inhibitory concentration (MIC), against nearly all genera of Enterobacteriaceae, in anaerobes such as Bacteroides, Prevotella, Porphyromonas, Fusobacterium and Peptostreptococcus, gram-positive organisms including methicillin-susceptible staphylococci, Streptococcus pyogenes and Streptococcus pneumoniae, as well as other community respiratory pathogens such as Haemophilus influenzae and Moraxella catarrhalis. The MIC is a measure used to describe the results of an in vitro assay in which a fixed number of a strain of bacteria are added to a 96-well plate and increasing concentrations of antibiotic are sequentially added to the wells. The concentration of antibiotic which inhibits growth of the bacteria in a well is considered the MIC. When looking across a collection of many strains of a species of bacteria, the MIC90 is the lowest concentration of antibiotic at which 90% of the strains are inhibited. Sulopenem lacks in vitro activity (MIC90 ≥ 16 µg/mL) against the oxidative non-fermenting pathogens such as Pseudomonas aeruginosa, Acinetobacter baumanii, Burkholderia cepacia, and Stenotrophomonas maltophilia. Given its lack of potency against Pseudomonas aeruginosa, its use in treatment of infections caused by pathogenic Enterobacteriaceae should not select for pseudomonas resistant to carbapenems, as can occur with imipenem and meropenem. For various species of enterococci, the MIC90 values were 4 to ≥ 64 µg/mL. Methicillin-resistant staphylococci also have high MIC values.

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The table below highlights the MIC50 and MIC90 of key target pathogens collected by JMI Laboratories in 2019 responsible for the infections studied in our Phase 3 program.

Organism Class	N	MIC50	MIC90
		(µg/mL)	(µg/mL)
E. coli	983	0.03	0.03
ESBL negative	813	0.03	0.03
ESBL positive	170	0.03	0.06
Klebsiella spp.	347	0.03	0.12
ESBL negative	224	0.03	0.06
ESBL positive	49	0.06	1
P. mirabilis	91	0.25	0.25
E. cloacae species complex	110	0.12	0.5
C. koseri	9	0.03	-
S. marcescens	36	0.5	2
Gram-negative anaerobes	287	0.12	1

A comparison of the in vitro activity of sulopenem relative to other carbapenems, as well as to currently prescribed oral agents for UTI, is provided below. The activity of sulopenem at slightly higher doses was very similar to that of ertapenem and meropenem, which are currently commercially available. In addition, sulopenem is noted to have potent in vitro activity against relevant organisms that are resistant to fluoroquinolones and trimethoprim-sulfamethoxazole and are ESBL positive. The prevalence of resistance for the existing generic antibiotics, now exceeding 20% for many pathogens, underscores the challenge of treating patients with uUTI in an outpatient setting or releasing patients from the hospital with a cUTI or cIAI on a reliable stepdown oral therapy.

	E. coli		K. pneumoniae		P. mirabilis
	N = 983		N = 273		N = 91
Penem Class:	MIC90 (μg/mL)	%S*	MIC90 (μg/mL)	%S*	MIC90 (μg/mL)	%S*
Sulopenem	0.03	-	0.06	-	0.25	-
Ertapenem	0.03	99.7	0.06	97.1	0.015	100
Imipenem	<0.12	99.9	0.5	98.5	2	38.5
Meropenem	0.03	99.9	0.03	98.5	0.12	100
Oral Agents Currently on Market:
Nitrofurantoin	32	96	>64	23.1	>64	2.2
Ciprofloxacin	>16	70.3	4	78.3	>16	74.7
Trimethoprim-Sulfamethoxazole	>16	65.9	>16	80.2	>16	80
Amoxicillin-Clavulanate	16	80.3	16	85.3	2	97.8

N = bacterial samples; each product candidate was tested using the same sample size

% S = percentage susceptible, meaning the proportion of the number of isolates tested that had a MIC below the FDA defined
susceptibility breakpoint; boxed values signify a percentage susceptible below 80%, which is the threshold for concern for
use of an antibiotic before a culture is available

* Susceptibility breakpoints are established by the FDA and documented in product labeling based on the antibacterial agent treatment efficacy in Phase 3 clinical trials associated with a specific MIC. As such, susceptibility breakpoints have not yet been determined for sulopenem.

Animal Models

Sulopenem reduced the bacterial burden in the bladder and tissues of infected animals in a uUTI model in both diabetic and normal C3H/HeN mice using a MDR ST131 E. coli, a strain which is ESBL positive and resistant to fluoroquinolones and trimethoprim-sulfamethoxazole. Sulopenem was highly efficacious and remarkably robust in its reduction in bacterial burden, leading to complete resolution of bacteriuria in all or most of the animals in both study arms with the high dose treatment regimen also reducing bacterial burden in bladder tissue and the kidney.

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Non-clinical Pharmacology

Metabolic clearance is primarily characterized by hydrolysis of the ß-lactam ring. Sulopenem does not inhibit the major cytochrome P450 isoforms suggesting a low potential for drug interactions at therapeutic concentrations. It is predominantly excreted in the urine. Plasma protein binding for sulopenem is low at approximately 11%.

Phase 1 Program

The table below outlines the Phase 1 clinical trials that have been conducted with sulopenem etzadroxil and sulopenem.

Protocol	Year	Dose (mg), other medication	Subjects on sulopenem or sulopenem etzadroxil	Treatment (Days)
Sulopenem (CP-70,429)—Phase 1 Single Dose Clinical Trials
A109001	1987	1000 mg	6	1
Japanese PK		250 mg, 500 mg, 1000 mg	18	1
A7371007	2007	400 mg, 800 mg, 1600 mg, 2400 mg, 2800 mg, placebo	24	1
IT001-105	2018	366 mg IV	34	1
Sulopenem (CP-70,429)—Phase 1 Multiple Dose Clinical Trials
Japanese PK		500 mg, 1000 mg	12	5
Japanese PK		1000 mg	6	5
A1091001	2009	800 mg, 1200 mg, 1600 mg, 2000 mg, placebo	40	14
IT001-103	2019	1000 mg	15	2
IT001-104	2019	1000 mg	10	3
IT001-105	2018	1000 mg	12	3
Sulopenem etzadroxil (PF-03709270)—Phase 1 Single Dose Clinical Trials
A8811001	2007	400 mg, 600 mg, 1000 mg, 2000 mg, placebo	9	1
A8811006	2008	2000 mg	4	1
A8811007	2007	600 mg, probenecid	4	1
A8811008	2008	1200 mg, probenecid	24	1
A8811018	2008	1000 mg, 1200 mg, probenecid, aluminum hydroxide, pantoprazole	17	1
A8811003	2008	2000 mg, 4000 mg, 6000 mg, 8000 mg, placebo	11	1
IT001-101	2017	500 mg, 1000 mg, probenecid	48	1
IT001-102	2017	500 mg, probenecid	13	1
Sulopenem etzadroxil (PF-03709270)—Phase 1 Multiple Dose Clinical Trials
A8811003	2008	2000 mg, 1200 mg, probenecid, placebo	18	10
A8811015	2009	500 mg, 1000 mg, 1500 mg, probenecid, placebo, Augmentin	48	7
IT001-101	2017	500 mg, probenecid	64	7
IT001-103	2019	Bilayer tablet, 500 mg	47	2
IT001-104	2019	Bilayer tablet, 500 mg	19	3
IT001-105	2018	500 mg, bilayer tablet	34	2
Sulopenem (CP-70,429), Sulopenem etzadroxil (PF-03709270)—Phase 1 Renal Impairment Clinical Trial
A8811009	2010	200mg, 800 mg sulopenem or 1000 mg sulopenem etzadroxil	29	1
		Total	566

Note: Total number reflects the sum of patients exposed to a specific formulation and dosing duration and will overestimate the number of subjects exposed as some subjects received more than one formulation in a study.

Oral Sulopenem

We have designed oral sulopenem to include probenecid, a pharmacokinetic enhancer that delays the excretion through the kidneys of sulopenem and other ß-lactam antibiotics and has been extensively used for this purpose and the treatment of gout. It enables us to maximize the antibacterial potential of any given dose of oral sulopenem.

We conducted three Phase 1 clinical trials, IT001-101, IT001-102 and IT001-105, in healthy volunteers, in part to select the prodrug and explore various doses of probenecid combined with 500 mg of sulopenem etzadroxil. Findings from these clinical trials are consistent with those from other pharmacokinetic studies that employed different total doses of sulopenem etzadroxil. Specifically,

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the AUC (area under the curve, a measure of total exposure) and Cmax (maximum plasma concentration) are generally dose-proportional, and the concomitant use of probenecid increases the plasma exposure of sulopenem with any dose with which it was studied.

The mean total sulopenem exposures in the urine after a single 500 mg dose in IT001-101 exceeded the MIC90 for the entire twice-daily dosing interval in the 32 healthy volunteers who received 500 mg of sulopenem etzadroxil, as illustrated in the graph below. In a urine antibacterial assay, urine collected at two hours post-dose was bactericidal for numerous strains of E. coli and K. pneumoniae, including a strain of K. pneumoniae that was resistant to meropenem and imipenem, with a sulopenem MIC of 16 µg/mL.

Mean total sulopenem exposure in urine after single 500 mg dose of sulopenem etzadroxil with or without probenecid

 

In IT001-102, we evaluated sulopenem etzadroxil administered with and without probenecid in a randomized cross-over trial in healthy volunteers in a fasted state. Subjects receiving sulopenem etzadroxil in a powder-in-a-bottle formulation co-administered with a separate tablet of probenecid demonstrated an increase in the time over MIC (of a 12 hour dosing interval) and AUC of sulopenem, as shown in the table below.

			Sulopenem Parameter (Day 1)
Treatment	N	Descriptive Statistic	Cmax (ng/mL)	AUC0-¥ (hr*ng/mL)	T>MIC (0.5 µg/mL) [hr]	T>MIC (0.5 µg/mL) [%]
500 mg Sulopenem etzadroxil	10	Mean	1928	3871	2.8	23.3
500 mg Sulopenem etzadroxil + 500 mg probenecid	11	Mean	1929	4964	3.6	30.2

N = number of subjects; Cmax = maximum plasma concentration; AUC0- = area under the curve from the initiation of dosing extrapolated
through infinite time

In addition, results from IT001-101 demonstrated that food increases the mean AUC and mean time over MIC (0.5 µg/mL) of 500 mg sulopenem etzadroxil dosed with 500 mg probenecid on Day 1 by 62% and 68%, respectively.

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In IT001-105 we studied the bioavailability of sulopenem etzadroxil/probenecid in our planned commercial formulation of a bilayer tablet. The absolute bioavailability of the bilayer tablet was approximately 40% in a fasted state and 64% in the fed state. A graph of the sulopenem plasma concentrations in the patients in this trial is provided below.

 

A Phase 1 drug interaction study with itraconazole demonstrated no interaction. An additional Phase 1 drug interaction study with valproic acid was also conducted which showed that IV sulopenem decreased the AUC and Cmax of valproic acid by approximately 33% and 28%, respectively, and oral sulopenem etzadroxil tablet without probenecid decreased valproic acid AUC and Cmax by approximately 25% and 19%, respectively, relative to valproic acid alone. These results are consistent with reports in the literature for other penem antibiotics co-administered with valproic acid. In contrast, multiple doses of sulopenem etzadroxil as the bilayer tablet had no effect on valproic acid AUC and Cmax relative to administration of valproic acid alone.

Sulopenem, IV Formulation

Doses of sulopenem up to 2800 mg as a single IV dose and 2000 mg BID, or twice daily, of sulopenem as IV over fourteen days were studied in three Phase 1 clinical trials in healthy adults, one study in patients with renal insufficiency in the United States and two Phase 1 clinical trials in Japan. Results from these pharmacokinetic studies with various IV doses of sulopenem delivered over various durations established dose proportionality among the regimens with regard to AUC and maximal plasma concentrations (Cmax). A representative analysis of pharmacokinetic parameters, a subset of study A1091001, is described in the table below.

	N	Dose (mg)	Infusion duration (h)	Cmax (µg/mL)	AUC 0-¥ (µg hr/mL)	T1/2 (h)	CLtotal (mL/min/kg)
Day 1	8	800	3	7.27	22.4	0.83
	8	1200	1	32.5	42.3	1.04
	8	1200	2.5	16.6	41.9	1.12
Day 14	5	800	3	8.97	26.5	0.89	15.4
	6	1200	1	30.7	41.4	1.05	14.7
	6	1200	2.5	13.5	34.6	1.01	18.8

N = number of subjects; Cmax = maximum plasma concentration; AUC0-¥ = area under the curve from the initiation of dosing extrapolated
through infinite time; T½ = half-life; CLtotal = clearance (only measured on Day 14)

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A single dose cross-over design study of 1000 mg of sulopenem infused over 3 hours was given to fasting healthy adults in our IT001-105 Phase 1 clinical trial. Pharmacokinetic parameters observed in this trial are described in the table below.

	N	Dose (mg)	Infusion duration (h)	Cmax (µg/mL)	AUC 0- (µg hr/mL)	T1/2 (h)
Day 1	12	1000	3	9.15	28.9	1.65

 

Modeling and Dose Selection

Based on in vitro susceptibility data from surveillance studies, pharmacokinetics gathered from Phase 1 clinical trials, and population pharmacokinetic data from patients, we performed modeling to help choose the doses for the Phase 3 program. The MIC90 for all Enterobacteriaceae potentially involved in the target indications was 0.25 µg/mL and for the weighted distribution of pathogens most likely to be associated with the indication was 0.06 µg/mL. We have performed modeling both for the weighted distribution of MICs expected in the clinical trials as well as at a fixed MIC of 0.5 µg/mL. Data obtained from animal experiments confirmed that, similar to carbapenems and lower than that for other ß-lactams, the %Tfree >MIC required for bacteriostasis is approximately 10–19%, depending on the dosing regimen; we have used 17% in our models. Based on the outputs from those models, the IV dose of sulopenem studied in the Phase 3 clinical trials was 1000 mg sulopenem delivered over 3 hours once a day. The oral dose studied was 500 mg of sulopenem etzadroxil given with 500 mg of probenecid in a single bilayer tablet twice daily.

Phase 2 Clinical Trial with sulopenem and sulopenem etzadroxil

In 2009, Pfizer initiated a Phase 2, randomized, double-blind, double-dummy clinical trial in hospitalized patients with CAP comparing two regimens of IV sulopenem followed by sulopenem etzadroxil to ceftriaxone IV followed by amoxicillin-clavulanate. The sulopenem regimens were a single 600 mg IV dose of sulopenem followed by 1000 mg BID of sulopenem etzadroxil or a 600 mg of sulopenem for a minimum of four doses followed by 1000 mg BID of sulopenem etzadroxil. The clinical trial was terminated early for business reasons after 33 of 250 planned total patients were enrolled and treated. Clinical response rates at the test-of-cure visit (7–14 days after end of therapy) of the ITT patients were similar on each regimen (9/10, 9/11 and 7/12, on sulopenem single IV dose, sulopenem multidose IV and ceftriaxone, respectively). Treatment-emergent adverse events were reported in six subjects each in the sulopenem groups and eight subjects in the ceftriaxone group. The most common treatment-emergent adverse event was diarrhea, reported by a total of six subjects (two in each treatment group). Treatment related diarrhea was reported by one subject following sulopenem single dose IV, and by a further two subjects following ceftriaxone. There was one treatment-related serious adverse event in the ceftriaxone group. There were no deaths reported in this clinical trial.

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Phase 3 Clinical Trials - Completed

Based on FDA Guidance from February 2015 (Complicated Intra-Abdominal Infections: Developing Drugs for Treatment. Guidance for Industry; Complicated Urinary Tract Infections: Developing Drugs for Treatment. Guidance for Industry) and on studies conducted by other sponsors, we negotiated SPA agreements for cUTI, cIAI and uUTI. All three Phase 3 clinical trials were initiated in the third quarter of 2018, and completed enrollment by the end of 2019. Oral sulopenem alone was studied for the treatment of outpatients with a uUTI. Oral sulopenem and sulopenem were studied for the treatment of cIAI and cUTI. A brief overview of the comparator agents, sample size, timing of efficacy assessments and duration of oral and IV dosing is provided in the graphic below. Non-inferiority in these clinical trials was defined by the lower limit of the confidence interval in the treatment difference of no more than -10%. The uUTI clinical trial also tested for superiority in the subset of patients with ciprofloxacin resistant pathogens at baseline. An open-label noncomparative treatment study of oral ciprofloxacin 250 mg twice daily for three days in uUTI patients was conducted to help characterize certain sample size assumptions as well as enable study logistics for this Phase 3 clinical trial. Patients in the cUTI and cIAI clinical trials received five days of sulopenem IV or comparator and then stepped down to two to five additional days of oral treatment with either oral sulopenem or ciprofloxacin. In the cIAI study, metronidazole was added to ciprofloxacin in the oral stepdown regimen.

Patients with an organism resistant to ciprofloxacin in the cUTI and cIAI clinical trials were allowed to substitute amoxicillin-clavulanate for the stepdown oral therapy. Patients who received oral sulopenem were encouraged, but not required, to dose with food.

 

In the uUTI trial, clinical outcome at the test-of-cure visit was noted as cure for those patients who are alive, who demonstrate resolution of the symptoms of uUTI present at trial entry (and no new symptoms) such that no new antibiotics are required, as well as the demonstration that the bacterial pathogen(s) found at trial entry are reduced to <103 CFU/mL on urine culture on Day 12. The primary endpoint was clinical and microbiologic response on Day 12 in the micro-MITT population. The micro-MITT population consists of those randomized patients who received a dose of study drug and had a gram-negative organism isolated in their urine. Two independent populations were prespecified and tested for an overall response of success at the test of cure (TOC) (Day 12): a) Superiority (286 patients): quinolone non-susceptible population assessed for superiority, defined as a p value <0.05, and b) Non-inferiority (785 patients): quinolone-susceptible population tested for non-inferiority, based on lower limit of 95% confidence interval for difference in microbiologic-modified intent to treat population being less than -10%.

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Micro-MITT population		Sulopenem n/N (%)	Ciprofloxacin n/N (%)	Difference (95% CI)	P value
Quinolone Non-Susceptible Population	Overall Response (TOC)	92/147 (62.6%)	50/139 (36.0%)	26.6% (15.1, 37.4)	< 0.001
	Reason for Failure: ASB	27 (18.4%)	38 (27.3%)
	Clinical Response (TOC)	122/147 (83.0%)	87/139 (62.6%)	20.4% (10.2, 30.4)	< 0.001
	Overall Response (EOT)	95/147 (64.6%)	42/139 (30.2%)	34.4% (23.1, 44.8)	< 0.001
Quinolone Susceptible Population	Overall Response (TOC)	247/370 (66.8%)	326/415 (78.6%)	-11.8% (-18.0, -5.6)
	Reason for Failure: ASB	47 (12.7%)	16 (3.9%)
	Clinical Response (TOC)	300/370 (81.1%)	349/415 (84.1%)	-3.0% (-8.4, 2.3)
	Overall Response (EOT)	240/370 (64.9%)	271/415 (65.3%)	-0.4% (-7.1, 6.2)
Combined (Quinolone Susceptible and Quinolone Non-Susceptible Populations)	Overall Response (TOC)	339/517 (65.6%)	376/554 (67.9%)	-2.3% (-7.9, 3.3)
	Reason for Failure: ASB	74 (14.3%)	54 (9.7%)
	Clinical Response (TOC)	422/517 (81.6%)	436/554 (78.7%)	2.9% (-1.9, 7.7)
	Overall Response (EOT)	335/517 (64.8%)	313/554 (56.5%)	8.3% (2.4, 14.1)	0.006

ASB = asymptomatic bacteriuria; EOT = end of trial; TOC = test of cure

In the quinolone non-susceptible population, sulopenem is superior to ciprofloxacin. In the Combined TOC (quinolone susceptible and quinolone non-susceptible populations), sulopenem is non-inferior to ciprofloxacin; however, in the quinolone susceptible population only, sulopenem is not non-inferior due primarily to asymptomatic bacteriuria at TOC (at end of treatment, results are similar between arms).

In the Phase 3 cUTI trial, clinical outcome at the test-of-cure visit was noted as cure for those patients who are alive, who demonstrate resolution of the symptoms of cUTI present at trial entry (and no new symptoms) such that no new antibiotics are required, as well as the demonstration that the bacterial pathogen(s) found at trial entry are reduced to <103 CFU/mL on urine culture on Day 21. The primary endpoint was clinical and microbiologic response on Day 21 in the micro-MITT population. The micro-MITT population consists of those randomized patients who received a dose of study drug and had a gram-negative organism isolated in their urine. In this population, the difference in outcomes was 6.1% with a 95% confidence interval on that difference of -12.0% to -0.1%. Non-inferiority for the primary endpoint required that the lower limit of the difference in the outcome rates be >-10%.

	Sulopenem	Ertapenem	Difference (95% Confidence Interval)
Test of Cure
microMITT	67.80%	73.90%	-6.1% (-12.0, -0.1)
Clinically Evaluable	89.4%	88.4%	1.0% (-3.1, 5.1)
End of Treatment
Overall Response	86.70%	88.90%	-2.2% (-6.5, 2.2)

In the Phase 3 cIAI trial, clinical outcome at the test-of-cure visit was noted as cure for those patients who are alive, have resolution in signs and symptoms of the index infection and for whom no new antibiotics or interventions for treatment failure were required. The primary endpoint was clinical response on Day 28 in the micro-MITT population. The micro-MITT population consists of those randomized patients who received a dose of study drug and had a gram-negative organism isolated from their infection site. In

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this population, the difference in outcomes was 4.7% with a 95% confidence interval on that difference of -10.3% to 1.0%. Non-inferiority for the primary endpoint required that the lower limit of the difference in the outcome rates be >-10%:

	Sulopenem	Ertapenem	Difference (95% Confidence Interval)
Test of Cure
microMITT	85.5%	90.2%	-4.7% (-10.3, 1.0)
MITT	87.2%	90.0%	-2.9% (- 7.7, 2.0)
Clinically Evaluable	93.6%	95.7%	-2.0% (-5.7, 1.7)
Microbiologically Evaluable	92.5%	95.5%	-3.0% (-7.5, 1.4)
End of Treatment
microMITT	83.5%	85.3%	-1.8% (- 8.1, 4.5)
MITT	83.7%	85.4%	-1.7% (-7.1, 3.8)
Clinically Evaluable	89.4%	90.0%	-0.7% (-5.6, 4.3)
Microbiologically Evaluable	88.5%	88.9%	-0.4% (-6.3, 5.4)

Safety Profile of Oral Sulopenem and Sulopenem

Sulopenem is a thiopenem and a member of the class of ß-lactam antibiotics, a class from which numerous safe and well tolerated antibiotics have been available for over thirty years.

In the cIAI trial, among 668 treated patients, treatment-related adverse events were observed in 6.0% and 5.1% of patients on sulopenem and ertapenem, respectively, with the most commonly reported drug-related adverse event being diarrhea, which was observed in 4.5% and 2.4% of patients on sulopenem and ertapenem, respectively. Discontinuations from treatment were uncommon for both regimens, occurring in 1.5% of patients on sulopenem and 2.1% of patients on ertapenem. Serious adverse events unrelated to study treatment were seen in 7.5% of patients on sulopenem and 3.6% of patients on ertapenem. In the cUTI trial, patients received either sulopenem IV followed by sulopenem etzadroxil, if eligible for oral therapy, or ertapenem IV followed by ciprofloxacin or amoxicillin-clavulanate, if eligible for oral therapy. Among 1,392 treated patients, treatment-related adverse events were observed in 6.0% and 9.2% of patients on sulopenem and ertapenem, respectively, with the most commonly reported adverse events being headache (3.0% and 2.2%), diarrhea (2.7% and 3.0%) and nausea (1.3% and 1.6%), on sulopenem and ertapenem, respectively. Discontinuations from treatment were uncommon for both regimens, occurring in 0.4% of patients on sulopenem and 0.6% of patients on ertapenem. Serious adverse events unrelated to study treatment were seen in 2.0% of patients on sulopenem and 0.9% of patients on ertapenem. In the uUTI trial, patients received either oral sulopenem or ciprofloxacin. Among 1,660 treated patients, treatment related adverse events were observed in 17.0% and 6.2% of patients on sulopenem and ciprofloxacin, respectively. The most commonly reported adverse events were diarrhea (12.4% and 2.5%), nausea (3.7% and 3.6%), and headache (2.2% and 2.2%), for sulopenem and ciprofloxacin patients, respectively. The difference in adverse events was driven by diarrhea which, in the majority of patients, was mild and self-limited. Overall discontinuations due to adverse events were uncommon on both regimens and were seen in 1.6% of patients on sulopenem and 1.0% of patients on ciprofloxacin. Serious adverse events were seen in 0.7% of patients on sulopenem with one drug-related serious adverse event due to transient angioedema and 0.2% of patients on ciprofloxacin with no drug-related serious adverse event.

Data is also available for the oral formulation collected in healthy volunteers in the Phase 1 program conducted by Pfizer and Iterum that is consistent with the adverse event profile observed above. An additional adverse event of interest identified with the oral prodrug, as further assessed in detail in clinical trial IT001-101, is loose stool/diarrhea, which was considered of mild severity and self-limited, as seen with other broad spectrum oral antibiotics with activity against the anaerobic flora of the gastrointestinal tract. During the seven-day dosing interval, the incidence of diarrhea, defined as having three or more episodes of loose stool in one day or having two or more episodes of loose stool per day for two consecutive days, peaked at 13% on Day 3 and fell to 2% by Day 7, with no patient discontinuing their dosing due to this event. For patients who took their dose with food, the peak incidence was 9%, dropping again to 3% by Day 4, similar to placebo. Some patients also identified a mild change in the odor of their urine after dosing with either the oral or IV formulations, as can be seen with other ß-lactam antibiotics.

We have received a waiver from the FDA for the requirement of performing a thorough QT interval study given the lack both of any significant preclinical findings and signals in Phase 1 clinical trials during which intensive electrocardiogram monitoring was performed. The EMA in written scientific advice also agreed that a QT interval study is not warranted. A preclinical study of the hydrolysis product of etzadroxil (2-ethylbutyric acid) has been performed in which no effect on plasma carnitine in rats was identified, while a significant effect of a different prodrug moiety, pivoxil, was observed. No reports of seizures, seen with some members of the carbapenem class, were noted in preclinical studies or clinical trials.

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Phase 3 Clinical Trial – Ongoing

In July 2022, we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. We anticipate completing enrollment in the first half of 2024. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Oral sulopenem alone is being studied for the treatment of outpatients with a uUTI. A brief overview of the comparator agent, sample size, timing of efficacy assessment and duration of oral dosing is provided in the graphic below. Non-inferiority in this clinical trial is defined by the lower limit of the 95% confidence interval for the treatment difference of no more than -10%. If successful, this trial would form the basis for a resubmission of our NDA to the FDA for oral sulopenem for the treatment of uUTI, which may potentially include for a limited population. REASSURE will also test for superiority in the subset of patients with Augmentin® resistant pathogens at baseline.

 

Pfizer License Agreement

In November 2015, we and our wholly owned subsidiary, Iterum Therapeutics International Limited, entered into a license agreement with Pfizer (the Pfizer License), pursuant to which we acquired from Pfizer an exclusive, royalty-bearing license under certain patent rights and know-how to develop, manufacture and commercialize sulopenem and related compounds, including, among others, sulopenem etzadroxil and three other sulopenem prodrugs, globally for the treatment, diagnosis and prevention of infectious diseases and infections in humans. The licensed patents include two U.S. patents, one of which covers the composition of matter of sulopenem etzadroxil, one patent in Japan, one patent in Hong Kong and one patent in Mexico. None of the licensed patents cover the IV formulation of sulopenem. All patents directed to the compound sulopenem expired prior to us entering into the Pfizer License. Pursuant to the Pfizer License, our exclusive license from Pfizer includes certain know-how, data and regulatory documents that will support the development of sulopenem. We have the right to grant development or commercialization sublicenses to third parties, provided that we (1) obtain Pfizer’s prior written consent in connection with such sublicense, (2) enter into a written sublicense agreement consistent with the terms and conditions of the Pfizer License and (3) include Pfizer as a third-party beneficiary under such sublicense. As between Pfizer and us, we own all right, title and interest in any intellectual property rights that are developed by us or our sublicensees in connection with the Pfizer License.

Under the Pfizer License, we have sole responsibility for and control over the development, regulatory approval, manufacture and commercialization of licensed products worldwide, including bearing all costs and expenses associated therewith. We are obligated to use commercially reasonable efforts to develop and seek regulatory approval for one licensed product in the United States and in at least one country out of any of France, Germany, Italy, Japan, Spain or the United Kingdom (Major Market Countries) and, if deemed appropriate by us in our exercise of commercially reasonable efforts, for a second licensed product in the United States or at least one Major Market Country. In addition, we must use commercially reasonable efforts to commercialize a licensed product in the United States and each Major Market Country in which we have received regulatory approval for such product.

Under the Pfizer License, we have paid Pfizer a one-time nonrefundable upfront fee of $5.0 million and a total of $15.0 million in clinical milestones based on first patient dosed in our Phase 3 clinical trials with sulopenem etzadroxil and sulopenem IV and are obligated to pay Pfizer potential future regulatory milestone payments, as well as potential sales milestones upon achievement of net sales ranging from $250.0 million to $1.0 billion for each product type (sulopenem etzadroxil and other prodrugs, and sulopenem and other non-prodrugs). We are obligated to pay Pfizer royalties ranging from a single-digit to mid-teens percentage of marginal net sales of each licensed product. Pfizer also received 381,922 of our Series A preferred shares (which converted to 25,461 ordinary shares in connection with our initial public offering) at a value of $15.71 per share as additional payment for the licensed rights. In addition, if we sublicense or assign any of our rights to any licensed products to a third party, and we receive in connection with such transaction a threshold amount of at least a low nine figure dollar amount over a specified period of time, we will be obligated to pay Pfizer an additional one-time payment of a low eight figure dollar amount.

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At our cost and expense, we are responsible for the prosecution and maintenance of the licensed patents worldwide, using specific legal counsel in various jurisdictions as set forth in the Pfizer License. If we elect to forgo prosecution or maintenance of a licensed patent, we must notify Pfizer and Pfizer has the right to continue prosecution and maintenance of such licensed patent and the exclusive license granted to us under such licensed patent will become a non-exclusive and non-sublicensable license. Subject to certain consultation rights granted to Pfizer, we have the first right, but not the obligation, to enforce the licensed patents at our cost and expense. If we elect to enforce any licensed patent, we may not enter into a settlement agreement that would: (1) adversely affect the validity, enforceability or scope of any of the licensed patents, (2) give rise to any liability for Pfizer, (3) admit non-infringement of any of the licensed patents or (4) otherwise impair Pfizer’s rights in any of the licensed patents or licensed know-how without the prior written consent of Pfizer.

The Pfizer License continues in effect until the expiration of all royalty terms thereunder, unless earlier terminated. Upon such expiration, the Pfizer License shall become non-exclusive, fully-paid, royalty free, perpetual and irrevocable. The royalty term for each licensed product in each country begins as of the first commercial sale of such licensed product in such country and lasts until the later of (1) the expiration of the applicable licensed patents in such country, (2) the expiration of regulatory or data exclusivity for such licensed product in such country and (3) fifteen years after the first commercial sale of such licensed product in such country. Pursuant to the terms of the Pfizer License, each party has the right to terminate the Pfizer License upon the other party’s (1) material breach of the Pfizer License that remains uncured after 60 days (or, if the breach cannot be cured in 60 days, up to 150 days) of receipt of notice or (2) insolvency. In addition, we have the unilateral right to terminate the Pfizer License for convenience by providing 90 days’ written notice to Pfizer.

Intellectual Property

We strive to protect the proprietary technology that we believe is important to our business, including seeking and maintaining rights in patents intended to cover our product candidates and compositions, their methods of use and processes for their manufacture and any other inventions that are commercially important to the development of our business. We own two U.S. patents, with one patent directed to the composition of the bilayer tablet of oral sulopenem and its related uses, and the other directed to the method of use of oral sulopenem in treating multiple diseases, including uUTIs. In addition to patents owned by us, we also rely on the Pfizer License for intellectual property rights that are important or necessary for the development of sulopenem etzadroxil and the IV formulation of sulopenem. We do not however license any patent rights that cover the IV formulation of sulopenem and all patent rights covering the compound sulopenem expired prior to us entering into the Pfizer License. We also rely, in some circumstances, on trade secrets to protect aspects of our business that are not amenable to, or that we do not consider appropriate for, patent protection.

Our success will significantly depend on our ability to obtain and maintain patent and other proprietary protection for commercially important technology and inventions and know-how related to our business, defend and enforce our in-licensed patents and patents we may own in the future, preserve the confidentiality of our trade secrets and operate without infringing the valid and enforceable patents and other proprietary rights of third parties. We also rely on know-how and continuing technological innovation to develop and maintain our proprietary position.

Intellectual Property Relating to Oral Sulopenem

As of February 28, 2023, we exclusively license from Pfizer two U.S. patents and three foreign patents, including one U.S. patent directed to composition of matter of sulopenem etzadroxil, which is projected to expire in 2029, subject to potential extension under the Hatch-Waxman Act to 2034, and three foreign patents related to oral sulopenem. We also own two U.S. patents, with one patent directed to the composition of the bilayer tablet of oral sulopenem and its related uses, and the other directed to the method of use of oral sulopenem in treating multiple diseases, including uUTIs. Both patents are projected to expire in 2039, excluding any additional term for patent adjustments or patent term extensions. We also own three pending U.S. patent applications and twenty-seven pending foreign patent applications, which collectively cover uses of sulopenem and probenecid and bilayer tablets of sulopenem etzadroxil and probenecid. Any U.S. or foreign patents issuing from the pending applications are projected to expire between 2039 and 2041, excluding any additional term for patent adjustments or patent term extensions.

Patent Term and Patent Term Extensions

The term of individual patents depends upon the legal term for patents in the countries in which they are obtained. In most countries, including the United States, the patent term is 20 years from the earliest filing date of a non-provisional patent application. In the United States, a patent’s term may be lengthened by patent term adjustment, which compensates a patentee for administrative delays by the United States Patent and Trademark Office in examining and granting a patent, or may be shortened if a patent is terminally disclaimed over an earlier filed patent. The term of a patent that covers a drug, biological product or medical device approved pursuant to a pre-market approval may also be eligible for patent term extension when FDA approval is granted, provided statutory and regulatory requirements are met. The length of the patent term extension is related to the length of time the drug is under regulatory review while the patent is in force. The Hatch-Waxman Act permits a patent term extension of up to five years beyond the

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expiration date set for the patent. Patent extension cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval, only one patent applicable to each regulatory review period may be granted an extension and only those claims reading on the approved drug are extended. Similar provisions are available in Europe and other foreign jurisdictions to extend the term of a patent that covers an approved drug.

Trade Secrets

We rely, in some circumstances, on trade secrets to protect our unpatented technology. However, trade secrets can be difficult to protect. We seek to protect our trade secrets and proprietary technology and processes, in part, by entering into non-disclosure and confidentiality agreements with our employees, consultants, scientific advisors, suppliers, contractors and other third parties. We also seek to preserve the integrity and confidentiality of our data and trade secrets by maintaining physical security of our premises and physical and electronic security of our information technology systems. While we have confidence in these individuals, organizations and systems, agreements or security measures may be breached and our trade secrets and other proprietary information may be disclosed. We may not have adequate remedies for any breach and could lose our trade secrets and other proprietary information through such a breach. In addition, our trade secrets may otherwise become known or be independently discovered by competitors. To the extent that our consultants, contractors or collaborators use intellectual property owned by others in their work for us, disputes may arise as to the rights in related or resulting trade secrets, know-how and inventions. For more information regarding the risks related to our intellectual property, see the section titled “Risk Factors—Risks Related to our Intellectual Property.”

Competition

The pharmaceutical industry is characterized by intense competition and rapid innovation. Our potential competitors include large pharmaceutical and biotechnology companies, specialty pharmaceutical companies and generic drug companies. Many of our potential competitors have greater financial, technical and human resources than we do, as well as greater experience in the discovery and development of product candidates, obtaining FDA and other regulatory approvals of products and the commercialization of those products. Accordingly, our potential competitors may be more successful than us in obtaining FDA approved drugs and achieving widespread market acceptance. We anticipate that we will face intense and increasing competition as new drugs enter the market and advanced technologies become available. Finally, the development of new treatment methods for the diseases we are targeting could render our product candidates non-competitive or obsolete.

We believe the key competitive factors that will affect the development and commercial success of oral sulopenem and sulopenem, if approved, will be efficacy, coverage of drug-resistant strains of bacteria, safety and tolerability profile, reliability, convenience of oral dosing, price, availability of reimbursement from governmental and other third-party payors and susceptibility to drug resistance.

If approved, oral sulopenem could compete with a few oral antibiotics currently in late-stage clinical development to treat uUTIs, including gepotidacin from GlaxoSmithKline and pivmecillinam from Utility Therapeutics Limited. If our competitors obtain marketing approval from the FDA or comparable foreign regulatory authorities for their product candidates more rapidly than us, it could result in our competitors establishing a strong market position before we are able to enter the market.

We also expect that oral sulopenem, if approved, would compete with future and current generic versions of marketed oral antibiotics such as levofloxacin, ciprofloxacin, nitrofurantoin, fosfomycin, amoxicillin-clavulanate, cephalexin and trimethoprim-sulfamethoxazole. If approved, we believe that oral sulopenem would compete effectively against these compounds on the basis of sulopenem’s potential:

•broad range of activity against a wide variety of resistant and MDR gram-negative bacteria;

•low probability of drug resistance;

•favorable safety and tolerability profile;

•convenient oral dosing regimen and opportunity to step down from IV-administered therapy; and

•use as a monotherapy treatment for resistant and MDR gram-negative infections.

There are several IV-administered products marketed for the treatment of infections resistant to first-line therapy for gram-negative infections, including Avycaz from AbbVie Inc. and Pfizer, Vabomere from Melinta Therapeutics, Inc., Zerbaxa from Merck & Co., Zemdri from Cipla, Xerava from La Jolla Pharmaceutical Company, Recarbrio from Merck & Co, and Fetroja from Shionogi & Co., Ltd.

If approved, we believe that sulopenem would compete effectively and potentially occupy an earlier place in treatment against these compounds on the basis of sulopenem’s potential, including that sulopenem:

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•allows physicians to stay in the same molecule with stepdown therapy to oral sulopenem;

•has a convenient once a day dosing over a three-hour infusion period;

•has a broad spectrum activity against a wide variety of resistant and MDR gram-negative bacteria;

•has a low probability of drug resistance; and

•has a favorable safety and tolerability profile.

QIDP Status

As noted above, the FDA has designated sulopenem and oral sulopenem as QIDPs for the indications of uUTI, cUTI and cIAI as well as community-acquired bacterial pneumonia, acute bacterial prostatitis, gonococcal urethritis, and pelvic inflammatory disease. Fast track designation for these seven indications in both the oral and intravenous formulations has also been granted. QIDP status makes sulopenem eligible to benefit from certain incentives for the development of new antibiotics provided under the GAIN Act. Further, QIDP status could add five years to any other regulatory exclusivity period that may be granted. QIDP status for other indications is also possible given the coverage of gram-negative and gram-positive bacteria by sulopenem, pending submission of additional documentation and acceptance by the FDA. Fast track status provides an opportunity for more frequent meetings with the FDA, more frequent written communication related to the clinical trials, eligibility for accelerated approval and priority review and the potential for a rolling review.

Government Regulation and Product Approval

Government authorities in the United States, at the federal, state and local level, and in other countries, extensively regulate, among other things, the research, development, clinical trials, testing, manufacture, including any manufacturing changes, authorization, pharmacovigilance, adverse event reporting, recalls, packaging, storage, recordkeeping, labeling, advertising, promotion, distribution, marketing, sales, import and export of pharmaceutical products and product candidates such as those we are developing. The processes for obtaining regulatory approvals in the United States and in other countries, along with subsequent compliance with applicable statutes and regulations, require the expenditure of substantial time and financial resources.

United States Government Regulation

In the United States, the FDA regulates drug products under the Federal Food, Drug, and Cosmetic Act (FDCA) and implementing regulations. The process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations requires the expenditure of substantial time and financial resources. A company, institution, or organization which takes responsibility for the initiation and management of a clinical development program for such products, and for their regulatory approval, is typically referred to as a sponsor.

The process required by the FDA before a drug product may be marketed in the United States generally involves the following:

•completion of preclinical laboratory tests, animal studies and formulation studies in compliance with good laboratory practices (GLP) regulations;

•design of a clinical protocol and submission to the FDA of an investigational new drug (IND) application which must become effective before human clinical trials may begin;

•approval by an independent institutional review board (IRB) at each clinical site before each trial may be initiated;

•performance of adequate and well-controlled human clinical trials in accordance with good clinical practices (GCPs) to establish the safety and efficacy of the proposed drug product for each indication;

•submission to the FDA of an NDA;

•satisfactory completion of an FDA advisory committee review, if applicable;

•satisfactory completion of an FDA pre-approval inspection of the manufacturing facility or facilities at which the product is produced to assess compliance with current good manufacturing practices (cGMP), and to assure that the facilities, methods and controls are adequate to preserve the drug’s identity, strength, quality and purity;

•satisfactory completion of FDA audits of clinical trial sites to assure compliance with GCPs and the integrity of clinical data;

•payment of user fees and securing FDA review and approval of the NDA; and

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•commitment to comply with any post-approval requirements and the potential requirement to conduct post-approval studies.

Preclinical Studies

Preclinical studies include laboratory evaluation of product chemistry, toxicity and formulation, as well as animal studies to assess potential safety and efficacy. Preclinical tests intended for submission to the FDA to support the safety of a product candidate must be conducted in compliance with GLP regulations and the United States Department of Agriculture’s Animal Welfare Act. A drug sponsor must submit the results of the preclinical tests, together with manufacturing information, analytical data and any available clinical data or literature, among other things, to the FDA as part of an IND. Such studies are typically referred to as IND-enabling studies. Some preclinical testing may continue even after the IND is submitted.

The IND and IRB Processes

An IND is an exemption from the FDCA that allows an unapproved product candidate to be shipped in interstate commerce for use in an investigational clinical trial and a request for FDA authorization to administer such investigational product to humans. An IND automatically becomes effective 30 days after receipt by the FDA, unless before that time the FDA raises concerns or questions related to one or more proposed clinical trials and places the clinical trial on a clinical hold. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. As a result, submission of an IND may not result in the FDA allowing clinical trials to commence.

Following commencement of a clinical trial under an IND, the FDA may also place a clinical hold or partial clinical hold on that trial. Clinical holds are imposed by the FDA whenever there is concern for patient safety and may be a result of new data, findings, or developments in clinical trials, non-clinical studies, and/or CMC. A clinical hold is an order issued by the FDA to the sponsor to delay a proposed clinical investigation or to suspend an ongoing investigation. A partial clinical hold is a delay or suspension of only part of the clinical work requested under the IND. For example, a specific protocol or part of a protocol is not allowed to proceed, while other protocols may do so. Following issuance of a clinical hold or partial clinical hold, an investigation may only resume after the FDA has notified the sponsor that the investigation may proceed. The FDA will base that determination on information provided by the sponsor correcting the deficiencies previously cited or otherwise satisfying the FDA that the investigation can proceed.

In addition to the foregoing IND requirements, an IRB representing each institution participating in the clinical trial must review and approve the plan for any clinical trial before it commences at that institution, and the IRB must continue to review and reapprove the study at least annually. The IRB, which must operate in compliance with FDA regulations, must review and approve, among other things, the study protocol and informed consent information to be provided to study subjects and must monitor the trial until completed. An IRB can suspend or terminate approval of a clinical trial at its institution, or an institution it represents, if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the product candidate has been associated with unexpected serious harm to patients.

Additionally, some trials are overseen by an independent group of qualified experts organized by the trial sponsor, known as a data safety monitoring board (DSMB). This group provides authorization as to whether or not a trial may move forward at designated checkpoints based on review of available data from the study, to which only the DSMB maintains access. Suspension or termination of development during any phase of a clinical trial can occur if the DSMB determines that the participants or patients are being exposed to an unacceptable health risk.

Clinical Trials

Clinical trials involve the administration of the investigational product to human subjects under the supervision of qualified investigators in accordance with GCP requirements, which include the requirement that all research subjects provide their informed consent in writing for their participation in any clinical trial along with the requirement to ensure that the data and results reported from the clinical trials are credible and accurate. Clinical trials are conducted under protocols detailing, among other things, the objectives of the trial, the criteria for determining subject eligibility, the dosing plan, the parameters to be used in monitoring safety, the procedure for timely reporting of adverse events, and the effectiveness criteria to be evaluated. A protocol for each clinical trial and any subsequent protocol amendments must be submitted to the FDA as part of the IND. In addition, an IRB at each institution participating in the clinical trial must review and approve the plan for any clinical trial before it commences at that institution.

Human clinical trials are typically conducted in three sequential phases, which may overlap or be combined:

Phase 1: The drug is initially introduced into healthy human subjects or patients with the target disease or condition and tested for safety, dosage tolerance, absorption, metabolism, distribution, excretion and, if possible, to gain an early indication of its effectiveness. During Phase 1 clinical trials, sufficient information about the investigational drug’s pharmacokinetics and pharmacological effects may be obtained to permit the design of well-controlled and scientifically valid Phase 2 clinical trials.

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Phase 2: The drug is administered to a larger, but still limited patient population to identify possible adverse effects and safety risks, to preliminarily evaluate the efficacy of the product for specific targeted indications and to determine dosage tolerance and optimal dosage. Phase 2 clinical trials are typically well-controlled and closely monitored.

Phase 3: The drug is administered to an expanded patient population, generally at geographically dispersed clinical trial sites, in well-controlled clinical trials to generate enough data to statistically evaluate the efficacy and safety of the product for approval, to establish the overall risk-benefit profile of the product, and to provide adequate information for the labeling of the product. Phase 3 clinical trials usually involve a larger number of participants than a Phase 2 clinical trial.

In some cases, the FDA may approve an NDA for a product candidate but require the sponsor to conduct additional clinical trials to further assess the product candidate’s safety and effectiveness after approval. Such post-approval trials, typically referred to as Phase 4 clinical trials, may be conducted after initial marketing approval. Moreover, a clinical trial may combine the elements of more than one phase and the FDA often requires more than one Phase 3 trial to support marketing approval of a product candidate. A company’s designation of a clinical trial as being of a particular phase is not necessarily indicative that the study will be sufficient to satisfy the FDA requirements of that phase because this determination cannot be made until the protocol and data have been submitted to and reviewed by the FDA.

In December 2022, with the passage of the Food and Drug Omnibus Reform Act (FDORA), Congress required sponsors to develop and submit a diversity action plan for each Phase 3 clinical trial or any other “pivotal study” of a new drug or biological product. These plans are meant to encourage the enrollment of more diverse patient populations in late-stage clinical trials of FDA-regulated products. Specifically, action plans must include the sponsor’s goals for enrollment, the underlying rationale for those goals, and an explanation of how the sponsor intends to meet them. In addition to these requirements, the legislation directs the FDA to issue new guidance on diversity action plans.

Progress reports detailing the results of the clinical trials must be submitted at least annually to the FDA and more frequently if serious adverse events occur. Phase 1, Phase 2 and Phase 3 clinical trials may not be completed successfully within any specified period, or at all. Results from one trial may not be predictive of results from subsequent trials. Furthermore, the FDA or the sponsor may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug has been associated with unexpected serious harm to patients.

Sponsors of clinical trials are required to register and disclose certain clinical trial information on a public registry (clinicaltrials.gov) maintained by the U.S. National Institutes of Health. In particular, information related to the product, patient population, phase of investigation, study sites and investigators and other aspects of the clinical trial is made public as part of the registration of the clinical trial. The failure to submit clinical trial information to clinicaltrials.gov, as required, is a prohibited act under the FDCA with violations subject to potential civil monetary penalties of up to $10,000 for each day the violation continues. Although the FDA has historically not enforced these reporting requirements due to the long delay of the Department of Health and Human Services (HHS) in issuing final implementing regulations, those regulations have now been issued and the FDA has issued several Notices of Noncompliance to manufacturers since April 2021.

Expanded Access to an Investigational Drug for Treatment Use

Expanded access, sometimes called “compassionate use,” is the use of investigational new drug products outside of clinical trials to treat patients with serious or immediately life-threatening diseases or conditions when there are no comparable or satisfactory alternative treatment options. The rules and regulations related to expanded access are intended to improve access to investigational drugs for patients who may benefit from investigational therapies. FDA regulations allow access to investigational drugs under an IND by the company or the treating physician for treatment purposes on a case-by-case basis for: individual patients (single-patient IND applications for treatment in emergency settings and non-emergency settings); intermediate-size patient populations; and larger populations for use of the drug under a treatment protocol or Treatment IND Application. Our Expanded Access Program for oral sulopenem for the treatment of cUTIs due to quinolone non-susceptible uropathogens after an initial course of effective intravenous therapy became available in December 2020.

There is no obligation for a sponsor to make its drug products available for expanded access; however, as required by the 21st Century Cures Act, or Cures Act, passed in 2016, sponsors are required to make policies for evaluating and responding to requests for expanded access for patients publicly available upon the earlier of initiation of a Phase 2 or Phase 3 clinical trial, or 15 days after the investigational drug or biologic receives designation as a breakthrough therapy, fast track product, or regenerative medicine advanced therapy.

In addition, on May 30, 2018, the Right to Try Act, was signed into law. The law, among other things, provides a federal framework for certain patients to access certain investigational new drug products that have completed a Phase I clinical trial and that

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are undergoing investigation for FDA approval. Under certain circumstances, eligible patients can seek treatment without enrolling in clinical trials and without obtaining FDA permission under the FDA expanded access program. There is no obligation for a drug manufacturer to make its drug products available to eligible patients as a result of the Right to Try Act, but the manufacturer must develop an internal policy and respond to patient requests according to that policy.

Pediatric Studies

Under the Pediatric Research Equity Act of 2003, or PREA, a biologics license application or supplement thereto must contain data that are adequate to assess the safety and effectiveness of the product for the claimed indications in all relevant pediatric subpopulations, and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. Sponsors must also submit pediatric study plans prior to the assessment data. Those plans must contain an outline of the proposed pediatric study or studies the sponsor plans to conduct, including study objectives and design, any deferral or waiver requests, and other information required by regulation. The sponsor, the FDA, and the FDA’s internal review committee must then review the information submitted, consult with each other, and agree upon a final plan. The FDA or the sponsor may request an amendment to the plan at any time.

The FDA may, on its own initiative or at the request of the sponsor, grant deferrals for submission of some or all pediatric data until after approval of the product for use in adults, or full or partial waivers from the pediatric data requirements. A deferral may be granted for several reasons, including a finding that the product or therapeutic candidate is ready for approval for use in adults before pediatric trials are complete or that additional safety or effectiveness data needs to be collected before the pediatric trials begin. The law requires the FDA to send a PREA Non-Compliance letter to sponsors who have failed to submit their pediatric assessments required under PREA, have failed to seek or obtain a deferral or deferral extension or have failed to request approval for a required pediatric formulation. The FDA maintains a list of diseases that are exempt from PREA requirements due to low prevalence of disease in the pediatric population.

Submission and Review of an NDA

Assuming successful completion of the required clinical testing, the results of the preclinical studies and clinical trials, together with detailed information relating to the product’s CMC and proposed labeling, among other things, are submitted to the FDA as part of an NDA requesting approval to market the product for one or more indications. In most cases, the submission of an NDA is subject to a substantial application user fee. Under federal law, the submission of most NDAs is subject to an application user fee, which for federal fiscal year 2022 is $3,117,218 for an application requiring clinical data. The sponsor of an approved NDA is also subject to an annual program fee, which for fiscal year 2022 is $369,413. Under the Prescription Drug User Fee Act (PDUFA) guidelines that are currently in effect, the FDA has a goal of ten months from the date of “filing” of a standard NDA for a new molecular entity to review and act on the submission.

The FDA conducts a preliminary review of all applications within 60 days of receipt and must inform the sponsor at that time or before whether an application is sufficiently complete to permit its filing and substantive review. In pertinent part, the FDA’s regulations state that an application “shall not be considered as filed until all pertinent information and data have been received” by the FDA. In the event that FDA determines that an application does not satisfy this standard, it will issue a Refuse to File, or RTF, determination to the sponsor. The FDA may request additional information rather than accept an application for filing. In this event, the application must be resubmitted with the additional information, and it will also be subject to review before the FDA accepts it for filing.

Once the submission is accepted for filing, the FDA begins an in-depth substantive review. The FDA reviews an NDA to determine, among other things, whether the drug is safe and effective and whether the facilities in which it is manufactured, processed, packaged or held meet standards designed to assure the product’s continued safety, quality and purity.

In connection with its review of an NDA, the FDA typically will inspect the facility or facilities where the product is manufactured. The FDA will not approve an application unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent production of the product within required specifications.

Additionally, before approving an NDA, the FDA will typically inspect one or more clinical trial sites to assure compliance with GCP. The FDA generally accepts data from foreign clinical trials in support of an NDA if the trials were conducted under an IND. If a foreign clinical trial is not conducted under an IND, the FDA nevertheless may accept the data in support of an NDA if the study was conducted in accordance with GCPs and the FDA is able to validate the data through an on-site inspection, if deemed necessary.

The FDA may refer an application for a novel drug to an advisory committee. An advisory committee is a panel of independent experts, including clinicians and other scientific experts, that reviews, evaluates and provides a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions.

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The FDA also may require submission of a Risk Evaluation and Mitigation Strategy (REMS) plan to mitigate any identified or suspected serious risks. The REMS plan could include medication guides, physician communication plans, assessment plans, and elements to assure safe use, such as restricted distribution methods, patient registries, or other risk minimization tools. The FDA provided written notice to us in February 2021 that there is currently no requirement for a REMS plan in connection with our NDA for oral sulopenem.

Decisions on an NDA

The FDA reviews an application to determine whether the product is safe and whether it is effective for its intended use(s), with the latter determination being made on the basis of substantial evidence. The FDA has interpreted this evidentiary standard to require at least two adequate and well-controlled clinical investigations to establish effectiveness of a new product. Under certain circumstances, however, the FDA has indicated that a single trial with certain characteristics and additional information may satisfy this standard. Ultimately, the FDA will determine whether the expected benefits of the drug product outweigh its potential risks to patients.

Before approving an application, the FDA typically will inspect the facility or facilities where the product is or will be manufactured. These pre-approval inspections may cover all facilities associated with an NDA or Biologics License Application (BLA) submission, including drug component manufacturing, (e.g., active pharmaceutical ingredients), finished drug product manufacturing, and control testing laboratories. The FDA will not approve an application unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent production of the product within required specifications. The PREVENT Pandemics Act, which was enacted in December 2022, clarifies that foreign drug manufacturing establishments are subject to registration and listing requirements even if a drug or biologic undergoes further manufacture, preparation, propagation, compounding, or processing at a separate establishment outside the United States prior to being imported or offered for import into the United States. Additionally, before approving an NDA or BLA, the FDA will typically inspect one or more clinical sites to assure compliance with GCP. With passage of FDORA, Congress clarified the FDA’s authority to conduct inspections by expressly permitting inspection of facilities involved in the preparation, conduct, or analysis of clinical and non-clinical studies submitted to the FDA as well as other persons holding study records or involved in the study process.

After evaluating the NDA and all related information, including the advisory committee recommendation, if any, and inspection reports regarding the manufacturing facilities and clinical trial sites, the FDA will issue either a Complete Response Letter (CRL), or an approval letter. A CRL generally contains a statement of specific conditions that must be met before the NDA may be resubmitted and may require additional clinical or preclinical testing in order for FDA to reconsider the application. If a CRL is issued, the sponsor will have one year to respond to the deficiencies identified by the FDA, at which time the FDA can deem the application withdrawn or, in its discretion, grant the sponsor an additional six month extension to respond. The FDA has committed to reviewing resubmissions in response to an issued CRL in either two or six months depending on the type of information included. Even with submission of this additional information, the FDA ultimately may decide that the application does not satisfy the regulatory criteria for approval. For those seeking to challenge the FDA’s CRL decision, the agency has indicated that sponsors may request a formal hearing on the CRL or they may file a request for reconsideration or a request for a formal dispute resolution.

If and when those conditions have been met to the FDA’s satisfaction, the FDA will issue an approval letter. An approval letter authorizes commercial marketing of the drug with specific prescribing information for specific indications.

Even if the FDA approves a product, it may limit the approved indications for use of the product, require that contraindications, warnings or precautions be included in the product labeling, require that post-approval studies, including Phase 4 clinical trials, be conducted to further assess a drug’s safety after approval, require testing and surveillance programs to monitor the product after commercialization, or impose other conditions, including distribution and use restrictions or other risk management mechanisms under a REMS which can materially affect the potential market and profitability of the product. The FDA may prevent or limit further marketing of a product based on the results of post-marketing studies or surveillance programs. After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes, and additional labeling claims, are subject to further testing requirements and FDA review and approval.

Special FDA Expedited Review and Approval Programs

The FDA has various programs that are intended to expedite or simplify the process for the development and FDA review of drugs that are intended for the treatment of serious or life threatening diseases or conditions and demonstrate the potential to address unmet medical needs. The purpose of these programs is to provide important new drugs to patients earlier than under standard FDA review procedures. Even if a product qualifies for one or more of these programs, the FDA may later decide that the product no longer meets the conditions for qualification or decide that the time period for FDA review or approval will not be shortened. In addition, none of these expedited programs changes the standards for approval but they may help expedite the development or approval process of product candidates.

To be eligible for a fast track designation, the FDA must determine, based on the request of a sponsor, that a product is intended to treat a serious or life threatening disease or condition and demonstrates the potential to address an unmet medical need, or if the

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drug qualifies as a QIDP under the GAIN Act. The FDA will determine that a product will fill an unmet medical need if it will provide a therapy where none exists or provide a therapy that may be potentially superior to existing therapy based on efficacy or safety factors. Fast track designation provides additional opportunities for interaction with the FDA’s review team and may allow for rolling review of NDA components before the completed application is submitted, if the sponsor provides a schedule for the submission of the sections of the NDA, the FDA agrees to accept sections of the NDA and determines that the schedule is acceptable, and the sponsor pays any required user fees upon submission of the first section of the NDA. The FDA may decide to rescind the fast track designation if it determines that the qualifying criteria no longer apply.

The FDA may give a priority review designation to drugs that offer major advances in treatment for a serious condition or provide a treatment where no adequate therapy exists. Most products that are eligible for fast track designation are also likely to be considered appropriate to receive a priority review. A priority review means that the goal for the FDA to review an application is six months, rather than the standard review of ten months under current PDUFA guidelines. These six and ten month review periods are measured from the “filing” date for NDAs for new molecular entities. The FDA will automatically give a priority review designation for the first application submitted in respect of a product for which a QIDP designation was granted, such as sulopenem and oral sulopenem.

Limited Population Drug Pathway

With passage of the Cures Act, Congress also authorized the FDA to approve an antibacterial or antifungal drug product, alone or in combination with one or more other drugs, as a “limited population drug.” To qualify for this approval, or LPAD, pathway, the drug product must be intended to treat a serious or life‑threatening infection in a limited population of patients with unmet needs; the standards for approval of drugs under the FDCA must be satisfied; and FDA must receive a written request from the sponsor to approve the drug as a limited population drug pursuant to this provision. The FDA’s determination of safety and effectiveness for such a product must reflect the benefit‑risk profile of such drug in the intended limited population, taking into account the severity, rarity, or prevalence of the infection the drug is intended to treat and the availability or lack of alternative treatment in such a limited population. Accordingly, the FDA expects that development programs for drugs eligible for approval under the LPAD pathway will follow streamlined approaches to clinical development such as smaller, shorter or fewer clinical trials.

Any drug product approved under this pathway must be labeled with the statement “Limited Population” in a prominent manner and adjacent to the proprietary name of the drug product. The prescribing information must also state that the drug is indicated for use in a limited and specific population of patients and copies of all promotional materials relating to the drug must be submitted to the FDA at least 30 days prior to dissemination of the materials. If the FDA subsequently approves the drug for a broader indication, the agency may remove any post‑marketing conditions applicable to the product, including requirements with respect to labeling and review of promotional materials. Nothing in this pathway to approval of a limited population drug prevents sponsors of such products from seeking designation or approval under other provisions of the FDCA, such as accelerated approval.

Post-Approval Requirements

Drugs manufactured or distributed pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among other things, requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising and promotion and reporting of adverse experiences with the product. After approval, most changes to the approved product label, such as adding new indications or other labeling claims, are subject to prior FDA review and approval. There also are continuing, annual program user fee requirements for any marketed products, as well as new application fees for supplemental applications with clinical data.

The FDA may impose a number of post-approval requirements as a condition of approval of an NDA. For example, the FDA may require post-marketing testing, including Phase 4 clinical trials, and surveillance to further assess and monitor the product’s safety and effectiveness after commercialization.

In addition, drug manufacturers and other entities involved in the manufacture and distribution of approved drugs are required to register their establishments with the FDA and state agencies and are subject to periodic unannounced inspections by the FDA and these state agencies for compliance with cGMP requirements. Changes to the manufacturing process are strictly regulated and often require prior FDA approval before being implemented. FDA regulations also require investigation and correction of any deviations from cGMP and impose reporting and documentation requirements upon the sponsor and any third-party manufacturers that the sponsor may decide to use. Accordingly, manufacturers must continue to expend time, money, and effort in the area of production and quality control to maintain cGMP compliance.

The FDA strictly regulates the marketing, labeling, advertising and promotion of drug products that are placed on the market. A product cannot be commercially promoted before it is approved, and approved drugs may generally be promoted only for their approved indications. Promotional claims must also be consistent with the product’s FDA-approved label, including claims related to safety and effectiveness. The FDA and other federal agencies also closely regulate the promotion of drugs in specific contexts such as direct-to-consumer advertising, industry-sponsored scientific and education activities, and promotional activities involving the Internet

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and social media. In September 2021, the FDA published final regulations which describe the types of evidence that the agency will consider in determining the intended use of a drug product.

It may be permissible, under very specific, narrow conditions, for a manufacturer to engage in nonpromotional, non-misleading communication regarding off-label information, such as distributing scientific or medical journal information. Moreover, with passage of the Pre-Approval Information Exchange Act in December 2022, sponsors of products that have not been approved may proactively communicate to payors certain information about products in development to help expedite patient access upon product approval. Previously, such communications were permitted under FDA guidance, but the new legislation explicitly provides protection to sponsors who convey certain information about products in development to payors, including unapproved uses of approved products.

Once an approval is granted, the FDA may withdraw the approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the product reaches the market.

Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with manufacturing processes or failure to comply with regulatory requirements, may result in mandatory revisions to the approved labeling to add new safety information; imposition of post-market studies or clinical trials to assess new safety risks; or imposition of distribution or other restrictions under a REMS program. Other potential consequences of regulatory non-compliance include, among other things:

•restrictions on, or suspensions of, the marketing or manufacturing of the product, complete withdrawal of the product from the market or product recalls;

•interruption of production processes, including the shutdown of manufacturing facilities or production lines or the imposition of new manufacturing requirements;

•fines, warning letters or other enforcement letters or holds on post-approval clinical trials;

•refusal of the FDA to approve pending NDAs or supplements to approved NDAs, or suspension or revocation of product license approvals;

•product seizure or detention, or refusal to permit the import or export of products; or

•injunctions or the imposition of civil or criminal penalties.

In addition, the distribution of prescription pharmaceutical products is subject to the Prescription Drug Marketing Act (PDMA), which regulates the distribution of drugs and drug samples at the federal level, and sets minimum standards for the registration and regulation of drug distributors by the states. Both the PDMA and state laws limit the distribution of prescription pharmaceutical product samples and impose requirements to ensure accountability in distribution. Congress more recently enacted the Drug Supply Chain Security Act (DSCSA), which made significant amendments to the FDCA, including by replacing certain provisions from the PDMA pertaining to wholesale distribution of prescription drugs with a more comprehensive statutory scheme. The DSCSA now requires uniform national standards for wholesale distribution and, for the first time, for third-party logistics providers; it also provides for preemption of certain state laws in the areas of licensure and prescription drug traceability.

Exclusivity and Approval of Competing Products

Hatch-Waxman Exclusivity

In 1984, with passage of the Hatch-Waxman Amendments to the FDCA, Congress established an abbreviated regulatory scheme authorizing the FDA to approve generic drugs that are shown to contain the same active ingredients as, and to be bioequivalent to, drugs previously approved by the FDA. To obtain approval of a generic drug, a sponsor must submit an abbreviated new drug application (ANDA) to the agency. In support of such applications, a generic manufacturer may rely on the preclinical and clinical testing conducted for a drug product previously approved under an NDA, known as the reference listed drug (RLD). In addition, Congress authorized the FDA to approve a 505(b)(2) NDA for a drug for which the investigations made to show whether or not the drug is safe for use and effective in use and relied upon by the sponsor for approval of the application “were not conducted by or for the sponsor and for which the sponsor has not obtained a right of reference or use from the person by or for whom the investigations were conducted.”

Market and data exclusivity provisions under the FDCA can delay the submission or the approval of certain applications for competing products. The FDCA provides a five-year period of non-patent data exclusivity within the United States to the first sponsor to gain approval of an NDA for a new chemical entity. A drug is a new chemical entity if the FDA has not previously approved any other new drug containing the same active moiety, which is the molecule or ion responsible for the activity of the drug substance. This interpretation was confirmed with enactment of the Ensuring Innovation Act in April 2021. During the exclusivity period, the FDA may not accept for review an abbreviated new drug application (ANDA), or a 505(b)(2) NDA, submitted by another company that references the previously approved drug. However, an ANDA or 505(b)(2) NDA may be submitted after four years if it contains a certification of patent invalidity or non-infringement.

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The FDCA also provides three years of data exclusivity for an NDA, 505(b)(2) NDA, or supplement to an existing NDA or 505(b)(2) NDA if new clinical investigations, other than bioavailability studies, that were conducted or sponsored by the applicant, are deemed by the FDA to be essential to the approval of the application or supplement. Three-year exclusivity may be awarded for changes to a previously approved drug product, such as new indications, dosages, strengths or dosage forms of an existing drug. This three-year exclusivity covers only the conditions of use associated with the new clinical investigations and, as a general matter, does not prohibit the FDA from approving ANDAs or 505(b)(2) NDAs for generic versions of the original, unmodified drug product. Five-year and three-year exclusivity will not delay the submission or approval of a full NDA; however, an applicant submitting a full NDA would be required to conduct or obtain a right of reference to all of the preclinical studies and adequate and well-controlled clinical trials necessary to demonstrate safety and effectiveness.

Qualified Infectious Disease Product Exclusivity

Under the GAIN Act, the FDA may designate a product as a QIDP. In order to receive this designation, a drug must qualify as an antibiotic or antifungal drug for human use intended to treat serious or life-threatening infections, including those caused by either (i) an antibiotic or antifungal resistant pathogen, including novel or emerging infectious pathogens, or (ii) a so-called “qualifying pathogen” found on a list of potentially dangerous, drug-resistant organisms established and maintained by the FDA. A sponsor must request such designation before submitting a marketing application.

Upon approving an application for a QIDP, the FDA will extend by an additional five years any regulatory exclusivity period awarded, such as a five-year exclusivity period awarded for a new molecular entity. This extension is in addition to any pediatric exclusivity extension awarded, and the extension will be awarded only to a drug first approved on or after the date of enactment.

The GAIN Act provisions prohibit the grant of an exclusivity extension where the application is a supplement to an application for which an extension is in effect or has expired, is a subsequent application for a specified change to an approved product or is an application for a product that does not meet the definition of QIDP based on the uses for which it is ultimately approved.

Pediatric Exclusivity

Pediatric exclusivity is another type of non-patent marketing exclusivity in the United States and, if granted, provides for the attachment of an additional six months of regulatory exclusivity to the term of any existing patent or non-patent regulatory exclusivity, including orphan exclusivity, for drug products. This six-month exclusivity may be granted if an NDA sponsor submits pediatric data that fairly respond to a written request from the FDA for such data. The data does not need to show the product to be effective in the pediatric population studied; rather, if the clinical trial is deemed to fairly respond to the FDA’s request, the additional protection is granted. If reports of requested pediatric studies are submitted to and accepted by the FDA within the statutory time limits, whatever statutory or regulatory periods of exclusivity or patent protection cover the product are extended by six months. This is not a patent term extension, but it effectively extends the period during which the FDA cannot approve another application.

Patent Term Restoration and Extension

A patent claiming a new drug product may be eligible for a limited patent term extension under the Hatch-Waxman Act, which permits a patent restoration of up to five years for patent term lost during product development and the FDA regulatory review. The restoration period granted on a patent covering a product is typically one-half the time between the effective date of the IND and the submission date of an application, plus the time between the submission date of an application and the ultimate approval date. Patent term restoration cannot be used to extend the remaining term of a patent past a total of 14 years from the product’s approval date. Only one patent applicable to an approved product is eligible for the extension, and the application for the extension must be submitted prior to the expiration of the patent in question. A patent that covers multiple products for which approval is sought can only be extended in connection with one of the approvals. The U.S. Patent and Trademark Office reviews and approves the application for any patent term extension or restoration in consultation with the FDA.

Regulation Outside of the United States

In addition to regulations in the United States, we will be subject to a variety of regulations governing clinical trials and commercial sales and distribution of our products outside of the United States. Whether or not we obtain FDA approval for a product, we must obtain approval by the comparable regulatory authorities of other countries or economic areas, such as the European Union, before we may commence clinical trials or market products in those countries or areas. The approval process and requirements governing the conduct of clinical trials, product authorization, pricing and reimbursement vary greatly from place to place, and the time may be longer or shorter than that required for FDA approval.

Clinical Trials

On January 31, 2022, the new Clinical Trials Regulation (EU) No 536/2014 became effective in the European Union and replaced the prior Clinical Trials Directive 2001/20/EC. The new regulation aims at simplifying and streamlining the authorization, conduct and transparency of clinical trials in the European Union. Under the new coordinated procedure for the approval of clinical trials, the sponsor of a clinical trial to be conducted in more than one EU Member State will only be required to submit a single

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application for approval. The submission will be made through the Clinical Trials Information System, a new clinical trials portal overseen by the EMA and available to clinical trial sponsors, competent authorities of the EU Member States and the public.

Beyond streamlining the process, the new regulation includes a single set of documents to be prepared and submitted for the application as well as simplified reporting procedures for clinical trial sponsors, and a harmonized procedure for the assessment of applications for clinical trials, which is divided into two parts. Part I is assessed by the competent authorities of all EU Member States in which an application for authorization of a clinical trial has been submitted (Member States concerned). Part II is assessed separately by each Member State concerned. Strict deadlines have been established for the assessment of clinical trial applications. The role of the relevant ethics committees in the assessment procedure will continue to be governed by the national law of the concerned EU Member State. However, overall related timelines will be defined by the Clinical Trials Regulation.

The new regulation did not change the preexisting requirement that a sponsor must obtain prior approval from the competent national authority of the EU Member State in which the clinical trial is to be conducted. If the clinical trial is conducted in different EU Member States, the competent authorities in each of these EU Member States must provide their approval for the conduct of the clinical trial. Furthermore, the sponsor may only start a clinical trial at a specific study site after the applicable ethics committee has issued a favorable opinion.

Parties conducting certain clinical trials must, as in the United States, post clinical trial information in the European Union at the EudraCT website: https://eudract.ema.europa.eu.

Marketing Authorization

Under European Union regulatory systems, a company may submit marketing authorization applications either under a centralized or decentralized procedure. The centralized procedure is compulsory for medicinal products produced by biotechnology or those medicinal products containing new active substances for specific indications such as the treatment of AIDS, cancer, neurodegenerative disorders, diabetes, viral diseases and designated orphan medicines, and optional for other medicines which are highly innovative. Under the centralized procedure, a marketing application is submitted to the EMA where it will be evaluated by the Committee for Medicinal Products for Human Use and a favorable opinion typically results in the grant by the European Commission of a single marketing authorization that is valid for all European Union member states within 67 days of receipt of the opinion. The initial marketing authorization is valid for five years, but once renewed is usually valid for an unlimited period. The decentralized procedure provides for approval by one or more “concerned” member states based on an assessment of an application performed by one member state, known as the “reference” member state. Under the decentralized approval procedure, a sponsor submits an application, or dossier, and related materials to the reference member state and concerned member states. The reference member state prepares a draft assessment and drafts of the related materials within 120 days after receipt of a valid application. Within 90 days of receiving the reference member state’s assessment report, each concerned member state must decide whether to approve the assessment report and related materials. If a member state does not recognize the marketing authorization, the disputed points are eventually referred to the European Commission, whose decision is binding on all member states.

Brexit and the Regulatory Framework in the United Kingdom

The United Kingdom’s withdrawal from the European Union took place on January 31, 2020. The European Union and the United Kingdom reached an agreement on their new partnership in the Trade and Cooperation Agreement (Agreement), which was applied provisionally beginning on January 1, 2021 and which entered into force on May 1, 2021. The Agreement focuses primarily on free trade by ensuring no tariffs or quotas on trade in goods, including healthcare products such as medicinal products. Thereafter, the European Union and the United Kingdom will form two separate markets governed by two distinct regulatory and legal regimes. As such, the Agreement seeks to minimize barriers to trade in goods while accepting that border checks will become inevitable as a consequence that the United Kingdom is no longer part of the single market. As of January 1, 2021, the Medicines and Healthcare products Regulatory Agency (MHRA), became responsible for supervising medicines and medical devices in Great Britain, comprising England, Scotland and Wales under domestic law whereas Northern Ireland continues to be subject to EU rules under the Northern Ireland Protocol. The MHRA will rely on the Human Medicines Regulations 2012 (SI 2012/1916) (as amended) (HMR) as the basis for regulating medicines. The HMR has incorporated into the domestic law the body of EU law instruments governing medicinal products that pre-existed prior to the United Kingdom’s withdrawal from the European Union. The MHRA may rely on a decision taken by the European Commission on the approval of a new marketing authorization via the centralized procedure, until December 31, 2023.

General Data Protection Regulation

The collection, use, disclosure, transfer, or other processing of personal data regarding individuals in the EU, including personal health data, is subject to the EU General Data Protection Regulation (GDPR) which became effective on May 25, 2018. The GDPR is wide-ranging in scope and imposes numerous requirements on companies that process personal data, including requirements relating

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to processing health and other sensitive data, obtaining consent of the individuals to whom the personal data relates, providing information to individuals regarding data processing activities, implementing safeguards to protect the security and confidentiality of personal data, providing notification of data breaches, and taking certain measures when engaging third-party processors. The GDPR also imposes strict rules on the transfer of personal data to countries outside the European Union, including the United States, and permits data protection authorities to impose large penalties for violations of the GDPR, including potential fines of up to €20 million or 4% of annual global revenues, whichever is greater. The GDPR also confers a private right of action on data subjects and consumer associations to lodge complaints with supervisory authorities, seek judicial remedies, and obtain compensation for damages resulting from violations of the GDPR. Compliance with the GDPR is a rigorous and time-intensive process that may increase the cost of doing business or require companies to change their business practices to ensure full compliance.

In July 2020, the Court of Justice of the European Union (CJEU) invalidated the EU-U.S. Privacy Shield framework, one of the mechanisms used to legitimize the transfer of personal data from the European Economic Area (EEA) to the United States. The CJEU decision also drew into question the long-term viability of an alternative means of data transfer, the standard contractual clauses, for transfers of personal data from the EEA to the United States. This CJEU decision may lead to increased scrutiny on data transfers from the European Union to the United States generally and increase our costs of compliance with data privacy legislation as well as our costs of negotiating appropriate privacy and security agreements with our vendors and business partners. Additionally, in October 2022, President Biden signed an executive order to implement the EU-U.S. Data Privacy Framework, which would serve as a replacement to the EU-US Privacy Shield. The European Commission initiated the process to adopt an adequacy decision for the EU-US Data Privacy Framework in December 2022. It is unclear if and when the framework will be finalized and whether it will be challenged in court. The uncertainty around this issue may further impact our business operations in the European Union.

Pharmaceutical Coverage and Reimbursement

Sales of drug products depend, in part, on the availability and extent of coverage and reimbursement by third-party payors, such as government health programs, including Medicare and Medicaid, commercial insurance and managed healthcare organizations. Obtaining coverage and reimbursement approval for a drug product from third-party payors is a time-consuming and costly process that can require the provision of supporting scientific, clinical and cost effectiveness data for the use of drug products to the payor. There may be significant delays in obtaining such coverage and reimbursement for newly approved drug products, and coverage may be more limited than the purposes for which the drug product is approved by the FDA or similar regulatory authorities outside of the United States. Moreover, eligibility for coverage and reimbursement does not imply that a drug product will be paid for in all cases or at a rate that covers operating costs, including research, development, intellectual property, manufacture, sale and distribution expenses. Reimbursement rates may vary according to the use of the drug product and the clinical setting in which it is used, may be based on reimbursement levels already set for lower cost drug products and may be incorporated into existing payments for other services.

There is significant uncertainty related to the insurance coverage and reimbursement of newly approved drug products. In the United States, third-party payors often rely upon Medicare coverage policy and payment limitations in setting their own reimbursement policies, but also have their own methods and approval process apart from Medicare coverage and reimbursement determinations. It is difficult to predict what third-party payors will decide with respect to coverage and reimbursement for new drug products. An inability to promptly obtain coverage and adequate reimbursement rates from third-party payors for any approved drug products could have a material adverse effect on a pharmaceutical manufacturer’s operating results, ability to raise capital needed to commercialize drug products and overall financial condition.

Reimbursement may impact the demand for, and/or the price of, any drug product which obtains marketing approval. Even if coverage is obtained for a given drug product by a third-party payor, the resulting reimbursement payment rates may not be adequate or may require co-payments that patients find unacceptably high. Patients who are prescribed medications for the treatment of their conditions, and their prescribing physicians, generally rely on third-party payors to reimburse all or part of the costs associated with those medications. Patients are unlikely to use a drug product, and physicians may be less likely to prescribe a drug product, unless coverage is provided and reimbursement is adequate to cover all or a significant portion of the cost of the drug product. Therefore, coverage and adequate reimbursement is critical to new drug product acceptance. Coverage decisions may depend upon clinical and economic standards that disfavor new drug products when more established or lower cost therapeutic alternatives are already available or subsequently become available.

The containment of healthcare costs has become a priority of federal and state governments, and the prices of drugs have been a focus in this effort. The U.S. government, state legislatures and foreign governments have shown significant interest in implementing cost-containment programs, including price controls, restrictions on coverage and reimbursement, and requirements for substitution of generic drug products. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit a pharmaceutical manufacturer’s net revenue and results.

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In addition, it is expected that the increased emphasis on managed care and cost containment measures in the United States by third-party payors will continue and place further pressure on pharmaceutical pricing and coverage. Coverage policies and third-party reimbursement rates may change at any time. Even if favorable coverage and reimbursement status is attained for one or more drug products that gain regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

In addition, in some foreign countries, the proposed pricing for a drug must be approved before it may be lawfully marketed. The requirements governing drug pricing vary widely from country to country. For example, in the EU, the sole legal instrument at the EU level governing the pricing and reimbursement of medicinal products is Council Directive 89/105/EEC (the Price Transparency Directive). The aim of the Price Transparency Directive is to ensure that pricing and reimbursement mechanisms established in the EU Member States are transparent and objective, do not hinder the free movement of and trade in medicinal products in the EU, and do not hinder, prevent or distort competition on the market. The Price Transparency Directive does not provide any guidance concerning the specific criteria on the basis of which pricing and reimbursement decisions are to be made in individual EU Member States, nor does it have any direct consequence for pricing or reimbursement levels in individual EU Member States. The EU Member States are free to restrict the range of medicinal products for which their national health insurance systems provide reimbursement, and to control the prices and/or reimbursement levels of medicinal products for human use. An EU Member State may approve a specific price or level of reimbursement for the medicinal product, or alternatively adopt a system of direct or indirect controls on the profitability of the company responsible for placing the medicinal product on the market, including volume-based arrangements, caps and reference pricing mechanisms.

Health Technology Assessment (HTA) of medicinal products is becoming an increasingly common part of the pricing and reimbursement procedures in some EU Member States, including the United Kingdom, France, Germany, Ireland, Italy and Sweden. The HTA process in the EU Member States is governed by the national laws of these countries. HTA is the procedure according to which the assessment of the public health impact, therapeutic impact, and the economic and societal impact of use of a given medicinal product in the national healthcare systems of the individual country is conducted. HTA generally focuses on the clinical efficacy and effectiveness, safety, cost, and cost-effectiveness of individual medicinal products as well as their potential implications for the healthcare system. Those elements of medicinal products are compared with other treatment options available on the market. The outcome of HTA regarding specific medicinal products will often influence the pricing and reimbursement status granted to these medicinal products by the competent authorities of individual EU Member States. The extent to which pricing and reimbursement decisions are influenced by the HTA of the specific medicinal product vary between EU Member States. A negative HTA of one of our products by a leading and recognized HTA body, such as the National Institute for Health and Care Excellence in the United Kingdom, could not only undermine our ability to obtain reimbursement for such product in the EU Member State in which such negative assessment was issued, but also in other EU Member States. For example, EU Member States that have not yet developed HTA mechanisms could rely to some extent on the HTA performed in countries with a developed HTA framework, such as the United Kingdom, when adopting decisions concerning the pricing and reimbursement of a specific medicinal product.

Other Healthcare Laws

Healthcare providers, physicians and third-party payors play a primary role in the recommendation and prescription of drug product candidates which obtain marketing approval. In addition to FDA restrictions on marketing of pharmaceutical products, pharmaceutical manufacturers are exposed, directly, or indirectly, through customers, to broadly applicable fraud and abuse and other healthcare laws and regulations that may affect the business or financial arrangements and relationships through which a pharmaceutical manufacturer can market, sell and distribute drug products. Such laws include, without limitation the federal Anti-Kickback Statute; the federal false claims and civil monetary penalty laws, including the federal False Claims Act; the federal Health Insurance Portability and Accountability Act of 1996 (HIPAA); HIPAA, as amended by the Health Information Technology and Clinical Health Act of 2009, and its implementing regulations; the federal physician payment transparency requirements, sometimes referred to as the “Physician Payments Sunshine Act,” and its implementing regulations; and state and foreign law equivalents of each of the aforementioned federal laws, such as anti-kickback and false claims laws.

Because of the breadth of these laws and the narrowness of their exceptions and safe harbors, it is possible that business activities can be subject to challenge under one or more of such laws. The scope and enforcement of each of these laws is uncertain and subject to rapid change in the current environment of healthcare reform, especially in light of the lack of applicable precedent and regulations. Federal and state enforcement bodies have recently increased their scrutiny of interactions between healthcare companies and healthcare providers, which has led to a number of investigations, prosecutions, convictions and settlements in the healthcare industry.

Ensuring that business arrangements with third parties comply with applicable healthcare laws and regulations is costly and time consuming. If business operations are found to be in violation of any of the laws described above or any other applicable governmental regulations a pharmaceutical manufacturer may be subject to penalties, including civil, criminal and administrative penalties, damages, fines, disgorgement, individual imprisonment, exclusion from governmental funded healthcare programs, such as Medicare and Medicaid, contractual damages, reputational harm, diminished profits and future earnings, additional reporting

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obligations and oversight if subject to a corporate integrity agreement or other agreement to resolve allegations of non-compliance with these laws, and curtailment or restructuring of operations, any of which could adversely affect a pharmaceutical manufacturer’s ability to operate its business and the results of its operations.

Healthcare Reform

In the United States, there have been, and continue to be, a number of legislative and regulatory changes and proposed changes to the healthcare system that could affect the future results of pharmaceutical manufacturers’ operations. In particular, there have been and continue to be a number of initiatives at the federal and state levels that seek to reduce healthcare costs.

In March 2010, the United States Congress enacted the ACA, which, among other things, includes changes to the coverage and payment for drug products under government health care programs. Other legislative changes have been proposed and adopted since the ACA was enacted. In August 2011, the Budget Control Act of 2011, among other things, created measures for spending reductions by Congress. A Joint Select Committee on Deficit Reduction, tasked with recommending a targeted deficit reduction of at least $1.2 trillion for the years 2013 through 2021, was unable to reach required goals, thereby triggering the legislation’s automatic reduction to several government programs. These changes included aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, which went into effect in April 2013 and will remain in effect through 2031 under the Coronavirus Aid, Relief, and Economic Security Act. These Medicare sequester reductions were suspended and reduced through the end of June 2022, with the full 2% cut resuming thereafter. The American Taxpayer Relief Act of 2012, among other things, reduced Medicare payments to several providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. These laws may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtain for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used. Under current legislation, the actual reductions in Medicare payments may vary up to 4%.

Since enactment of the ACA, there have been, and continue to be, numerous legal challenges and Congressional actions to repeal and replace provisions of the law. For example, with enactment of the Tax Cuts and Jobs Act of 2017, or the TCJA, Congress repealed the “individual mandate.” The repeal of this provision, which requires most Americans to carry a minimal level of health insurance, became effective in 2019. Further, on December 14, 2018, a U.S. District Court judge in the Northern District of Texas ruled that the individual mandate portion of the ACA is an essential and inseverable feature of the ACA, and therefore because the mandate was repealed as part of the TCJA, the remaining provisions of the ACA are invalid as well. The U.S. Supreme Court heard this case on November 10, 2020 and, on June 17, 2021, dismissed this action after finding that the plaintiffs do not have standing to challenge the constitutionality of the ACA. Litigation and legislation over the ACA are likely to continue, with unpredictable and uncertain results.

The Trump Administration also took executive actions to undermine or delay implementation of the ACA, including directing federal agencies with authorities and responsibilities under the ACA to waive, defer, grant exemptions from, or delay the implementation of any provision of the ACA that would impose a fiscal or regulatory burden on states, individuals, healthcare providers, health insurers, or manufacturers of pharmaceuticals or medical devices. On January 28, 2021, however, President Biden issued a new executive order which directs federal agencies to reconsider rules and other policies that limit Americans’ access to health care, and consider actions that will protect and strengthen that access. Under this executive order, federal agencies are directed to re-examine: policies that undermine protections for people with pre-existing conditions, including complications related to COVID-19; demonstrations and waivers under Medicaid and the ACA that may reduce coverage or undermine the programs, including work requirements; policies that undermine the Health Insurance Marketplace or other markets for health insurance; policies that make it more difficult to enroll in Medicaid and the ACA; and policies that reduce affordability of coverage or financial assistance, including for dependents.

The prices of prescription pharmaceuticals have also been the subject of considerable discussion in the United States. There have been several recent U.S. congressional inquiries, as well as proposed and enacted state and federal legislation designed to, among other things, bring more transparency to pharmaceutical pricing, review the relationship between pricing and manufacturer patient programs, and reduce the costs of pharmaceuticals under Medicare and Medicaid. In 2020, President Trump issued several executive orders intended to lower the costs of prescription products and certain provisions in these orders have been incorporated into regulations. These regulations include an interim final rule implementing a most favored nation model for prices that would tie Medicare Part B payments for certain physician-administered pharmaceuticals to the lowest price paid in other economically advanced countries, effective January 1, 2021. That rule, however, has been subject to a nationwide preliminary injunction and, on December 29, 2021, Centers for Medicare and Medicaid Services (CMS) issued a final rule to rescind it. With issuance of this rule, CMS stated that it will explore all options to incorporate value into payments for Medicare Part B pharmaceuticals and improve beneficiaries’ access to evidence-based care.

In addition, in October 2020, HHS and the FDA published a final rule allowing states and other entities to develop a Section 804 Importation Program (SIP), to import certain prescription drugs from Canada into the United States. The final rule is currently the subject of ongoing litigation, but at least six states (Vermont, Colorado, Florida, Maine, New Mexico, and New Hampshire) have passed laws allowing for the importation of drugs from Canada with the intent of developing SIPs for review and approval by the

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FDA. Further, on November 20, 2020, HHS finalized a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to plan sponsors under Part D, either directly or through pharmacy benefit managers, unless the price reduction is required by law. The final rule would also eliminate the current safe harbor for Medicare drug rebates and create new safe harbors for beneficiary point-of-sale discounts and pharmacy benefit manager (PBM) service fees. It originally was set to go into effect on January 1, 2022, but with passage of the Inflation Reduction Act of 2022 (IRA) has been delayed by Congress to January 1, 2032.

On July 9, 2021, President Biden signed Executive Order 14063, which focuses on, among other things, the price of pharmaceuticals. To address these costs, the executive order directs the HHS to create a plan within 45 days to combat “excessive pricing of prescription drugs and enhance domestic pharmaceutical supply chains, to reduce the prices paid by the federal government for such drugs, and to address the recurrent problem of price gouging.” Thereafter, on September 9, 2021, HHS released its plan to reduce drug prices. The key features of that plan are to: (a) make drug prices more affordable and equitable for all consumers and throughout the health care system by supporting drug price negotiations with manufacturers; (b) improve and promote competition throughout the prescription drug industry by supporting market changes that strengthen supply chains, promote biosimilars and generic drugs, and increase transparency; and (c) foster scientific innovation to promote better healthcare and improve health by supporting public and private research and making sure that market incentives promote discovery of valuable and accessible new treatments.

More recently, on August 16, 2022, the IRA was signed into law by President Biden. The new legislation has implications for Medicare Part D, which is a program available to individuals who are entitled to Medicare Part A or enrolled in Medicare Part B to give them the option of paying a monthly premium for outpatient prescription drug coverage. Among other things, the IRA requires manufacturers of certain drugs to engage in price negotiations with Medicare beginning in 2026, with prices that can be negotiated subject to a cap; imposes rebates under Medicare Part B and Medicare Part D to penalize price increases that outpace inflation first due in 2023; and replaces the Part D coverage gap discount program with a new discounting program beginning in 2025. The IRA permits the Secretary of the HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years.

Specifically, with respect to price negotiations, Congress authorized Medicare to negotiate lower prices for certain costly single-source drug and biologic products that do not have competing generics or biosimilars and are reimbursed under Medicare Part B and Part D. CMS may negotiate prices for ten high-cost drugs paid for by Medicare Part D starting in 2026, followed by 15 Part D drugs in 2027, 15 Part B or Part D drugs in 2028, and 20 Part B or Part D drugs in 2029 and beyond. This provision applies to drug products that have been approved for at least nine years and biologics that have been licensed for 13 years, but it does not apply to drugs and biologics that have been approved for a single rare disease or condition. Further, the legislation subjects drug manufacturers to civil monetary penalties and a potential excise tax for failing to comply with the legislation by offering a price that is not equal to or less than the negotiated “maximum fair price” under the law or for taking price increases that exceed inflation. The legislation also requires manufacturers to pay rebates for drugs in Medicare Part D whose price increases exceed inflation. The new law also caps Medicare out-of-pocket drug costs at an estimated $4,000 a year in 2024 and, thereafter beginning in 2025, at $2,000 a year.

At the state level, individual states are increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. A number of states, for example, require drug manufacturers and other entities in the drug supply chain, including health carriers, pharmacy benefit managers, and wholesale distributors, to disclose information about pricing of pharmaceuticals. In addition, regional health care organizations and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription drug and other health care programs. These measures could reduce the ultimate demand for our products, once approved, or put pressure on our product pricing. We expect that additional state and federal healthcare reform measures will be adopted in the future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, which could result in reduced demand for our product candidates or additional pricing pressures.

Commercialization Strategy and Organization

Given our stage of development, we have not yet established a commercial organization or distribution capabilities for our initial indication. If approved, we intend to commercialize our sulopenem program in the United States with a commercial partner and/or on our own with a targeted sales force in the community setting.

Prior to receiving marketing approval, we plan to build an awareness program to familiarize physicians in the community setting with the rising rate of resistance of pathogens to the current oral therapies for uUTI, and in particular, the resistance rate of E. coli to quinolones in the specific areas those physicians are practicing. Additionally, prior to approval, we plan to develop marketing, sales and training materials as well as begin interacting with physicians to discuss the uUTI disease state and challenges that the existing treatments are facing. Some pre-commercialization activities including research and planning were undertaken in early 2021 which can be built on when we are in a position to resume commercialization activities.

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If the FDA approves oral sulopenem, we plan to build a commercial infrastructure to launch oral sulopenem in the United States. The commercial infrastructure would be led operationally by highly experienced management personnel and comprised of a sales force, marketing team, health resource group and a managed markets group focused on reimbursement and access with third-party payors. We also plan to have in place a patient and healthcare practitioner support group to assist with information requests, reimbursement logistics and assistance, and provide educational materials where appropriate.

We expect our sales team to focus its efforts on the physicians in the community and we plan to segment these physicians into priority targets based on three key variables: the rate of resistance in a physician’s territory, the number of prescriptions generated by an individual physician for uUTI and the commercial payor coverage in that territory. With these target physicians, we plan to deploy our commercial resources to highlight the patient profiles that would be appropriate for oral sulopenem, including patients with suspected or known quinolone resistant pathogens. We expect our commercial teams will work with physicians in the infectious disease field to answer questions regarding sulopenem’s clinical results and its pharmacokinetic profile, conduct medical education events regarding the emerging science and build awareness of sulopenem. To the extent access for, and awareness of, our sulopenem program increases, we would plan to broaden our target audience and geography by increasing the number of sales representatives to capture a larger percentage of the market.

We plan to focus our initial commercial efforts on the U.S. market, which we believe represents the largest market opportunity for our sulopenem program. We are currently evaluating our potential commercialization strategy outside the United States and believe that Europe and Asia represent significant opportunities because of rising rates of ESBL and quinolone resistance in these geographies, which in many countries exceeds the United States’ resistance rate.

Manufacturing

We do not currently own or operate manufacturing facilities for the production of any of our product candidates. We currently rely on a small number of third-party contract manufacturers for all of our required raw materials, drug substance, and finished drug product for our preclinical research and clinical trials. As of February 28, 2023, we had a 3-person team dedicated to managing the relationships with these manufacturers and the manufacturing process. Due to the complex and critical nature of drug manufacturing, we have employed a dual sourcing strategy in order to register two suppliers and validate one supplier for sulopenem etzadroxil API, with each supplier capable of producing commercial scale quantities under cGMP conditions. We also intend to have a third-party manufacturer produce the oral sulopenem bilayer tablets. In the future, given the importance of our oral formulation, we plan to pursue additional sources to manufacture tablets.

Employees and Human Capital

As of February 28, 2023, we had 14 full-time employees, including a total of three employees with M.D. or Ph.D. degrees. We are also supported by consultants and contractors in most areas of the business, including clinical, regulatory, CMC, Quality Assurance and finance and business and operations support. Eight of our employees were primarily engaged in research and development activities, with the rest providing administrative, business and operations support. None of our employees are represented by labor unions or covered by collective bargaining agreements. We consider our employee relations to be good. We may need to increase our workforce to support additional clinical activities, and, if we pursue additional clinical work related to other indications, we may increase our research and development headcount.

Our human capital resources objectives include, as applicable, identifying, recruiting, retaining, incentivizing and integrating our existing employees and additional employees that may be hired. The principal purposes of our equity incentive plans are to attract, retain and motivate selected employees, consultants and directors through the granting of share-based compensation awards.

Our Corporate Information

We were incorporated under the laws of the Republic of Ireland in June 2015 as a limited company and re-registered as a public limited company on March 20, 2018. Our principal executive offices are located at Fitzwilliam Court, 1st Floor, Leeson Close, Dublin 2, D02 YW24, Ireland, and our telephone number is (+353) 1 669-4820.

Available Information

We maintain a website with the address www.iterumtx.com. We make available free of charge through our website our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Sections 13(a) and 15(d) of the Securities Exchange Act of 1934 (the Exchange Act). We make these reports available through our website as soon as reasonably practicable after we electronically file such reports with, or furnish such reports to, the SEC. You can review our electronically filed reports, proxy and information statements and other information that we file with the SEC on the SEC’s web site at http://www.sec.gov. We also make available, free of charge on our website, the reports filed with the SEC by our executive officers, directors and 10% shareholders pursuant to Section 16 under the Exchange Act as soon as reasonably

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practicable after copies of those filings are provided to us by those persons. The information contained on, or that can be accessed through, our website is not a part of or incorporated by reference in this Annual Report on Form 10-K.

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Item 1A. Risk Factors.

Careful consideration should be given to the following risk factors, in addition to the other information set forth in this Annual Report on Form 10-K and in other documents that we file with the Securities and Exchange Commission, or SEC, in evaluating our company and our business. Investing in our ordinary shares involves a high degree of risk. If any of the events described in the following Risk Factors and the risks described elsewhere in this Annual Report on Form 10-K actually occur, our business, financial condition, results of operations and future growth prospects could be materially and adversely affected. In these circumstances, the market price of our ordinary shares could decline, and you may lose all or part of your investment.

Risks Related to Our Financial Position and Capital Requirements

We have incurred net losses in each year since our inception and anticipate that we will continue to incur significant losses unless we successfully commercialize our sulopenem program.

We are a clinical-stage pharmaceutical company with a limited operating history. We have not generated any product revenue and have incurred net losses in each year since our inception in 2015. As of December 31, 2022, we had an accumulated deficit of $422.9 million, cash and cash equivalents of $21.1 million and short-term investments of $39.7 million. Our product candidates, oral sulopenem and sulopenem (together, the sulopenem program), are in clinical development, and have not been approved for sale and we may never have our product candidates approved for commercialization. We submitted a New Drug Application (NDA) for oral sulopenem for the treatment of uncomplicated urinary tract infections (uUTIs) in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the U.S. Food and Drug Administration (FDA) accepted the application for review in January 2021. We received a Complete Response Letter (CRL) from the FDA on July 23, 2021, in respect of our NDA. The CRL provided that the FDA had completed its review of the NDA and had determined that it could not approve the NDA in its present form. The CRL further provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the special protocol assessment (SPA) process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REnewed ASsessment of Sulopenem in uUTI caused by Resistant Enterobacterales (REASSURE), in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical Pharmacokinetics and Pharmacodynamics (PK/PD) studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem.

We have financed our operations to date primarily with the issuance of ordinary shares and convertible preferred shares, pre-funded warrants and warrants, debt raised under a financing arrangement with Silicon Valley Bank (SVB), a sub-award from the Trustees of Boston University under the Combating Antibiotic Resistant Bacteria Biopharmaceutical Accelerator (CARB-X) program and the proceeds of a private placement which closed in January 2020 (the Private Placement) and a subsequent rights offering (the Rights Offering) pursuant to which our wholly owned subsidiary, Iterum Therapeutics Bermuda Limited (Iterum Bermuda), sold units (Units) consisting of (i) 6.500% Exchangeable Senior Subordinated Notes due 2025 (Exchangeable Notes); and (ii) Limited Recourse Royalty-Linked Subordinated Notes (RLNs and, together with the Exchangeable Notes, the Securities), to certain existing and new investors. In April 2018, we entered into a secured credit facility with SVB and made an initial drawdown of $15.0 million pursuant to a loan and security agreement. In April 2020, we entered into a note (PPP loan) with SVB of $0.7 million under the Paycheck Protection Program. In early June 2020, we issued and sold, in a registered direct offering (June 3, 2020 Offering), ordinary shares for aggregate gross proceeds to us of $5.0 million and net proceeds of $4.3 million after deducting fees payable to the placement agent and other offering expenses payable by us. In late June 2020, we issued and sold, in a registered direct offering (June 30, 2020 Offering), ordinary shares for aggregate gross proceeds to us of $5.0 million and net proceeds of $4.2 million after deducting fees payable to the placement agent and other offering expenses payable by us. In October 2020, we issued and sold, in a registered public offering (October 2020 Offering), ordinary shares and pre-funded warrants exercisable for ordinary shares, each offered together with warrants exercisable for ordinary shares, for aggregate gross proceeds to us of $17.4 million and net proceeds of $15.5 million after deducting fees payable to the placement agent and other offering expenses payable by us. On February 8 and February 10, 2021, we issued and sold, pursuant to an underwritten agreement and including the underwriter’s exercise in full of its option to purchase additional ordinary shares (February 2021 Underwritten Offering), ordinary shares for aggregate gross proceeds to us of $46.0 million and net proceeds of $42.1 million after deducting fees payable to the underwriter and other offering expenses payable by us. On February 12, 2021, we issued and sold, in a registered public offering (February 2021 Registered Direct Offering), ordinary shares for aggregate gross proceeds to us of $35.0 million and net proceeds of $32.2 million after deducting fees payable to the placement agent and other offering expenses payable by us. On October 7, 2022, we entered into an at the market offering agreement (the Sales Agreement) with H.C. Wainwright & Co., LLC (HC Wainwright), as agent, pursuant to which we may offer and sell ordinary shares, nominal value $0.01 per share for aggregate gross sales proceeds of up to $16.0 million (subject to the availability of ordinary shares),

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from time to time through HC Wainwright by any method permitted that is deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended. During the year ended December 31, 2022, we sold 356,933 ordinary shares under the Sales Agreement at an average price of $1.25 per share for net proceeds of $0.4 million. As of December 31, 2022, net proceeds of $16.2 million have been received from the exercise of certain warrants issued as part of the June 30, 2020 Offering, October 2020 Offering and February 2021 Underwritten Offering. We have devoted substantially all of our financial resources and efforts to research and development, including preclinical and clinical development, for our sulopenem program.

Following receipt of the CRL, in order to reduce operating expenses and conserve cash resources, we halted any remaining pre-commercial activities for oral sulopenem and plan to limit spending to essential costs required in connection with the potential resubmission of the NDA.

We expect to continue to incur significant expenses and increasing operating losses as we conduct clinical trials of oral sulopenem and sulopenem including the ongoing Phase 3 clinical trial being conducted in response to the CRL, seek marketing approval for oral sulopenem if clinical trials are successful, engage in pre-commercialization activities and pursue the development of our sulopenem program in additional indications, including through preclinical and clinical development. Our expenses will also increase substantially if and as we:

•conduct additional clinical trials for oral sulopenem and/or sulopenem, which includes the ongoing Phase 3 clinical trial being conducted to support potential resubmission of our NDA for oral sulopenem;

•initiate other studies as part of our sulopenem program, some of which may be required for regulatory approval of our product candidates and/or may be conducted in response to the CRL;

•establish sales, marketing and distribution capabilities either directly or through a third-party, to commercialize oral sulopenem and/or sulopenem in the United States if we obtain marketing approval from the FDA;

•establish manufacturing and supply chain capacity sufficient to provide commercial quantities of oral sulopenem and/or sulopenem, if we obtain marketing approval and undertake commercialization activities;

•pursue the development of our sulopenem program in additional indications;

•maintain, expand, defend and protect our intellectual property portfolio;

•hire additional clinical, scientific and commercial personnel;

•add operational, financial and management information systems and personnel, including personnel to support our product development and planned future commercialization efforts; and

•acquire or in-license other product candidates or technologies.

We will require additional capital to fund our operations. If we fail to obtain financing when needed or on acceptable terms, we could be forced to delay, reduce or eliminate our product development programs or commercialization efforts.

Developing pharmaceutical products is a time-consuming, expensive and uncertain process that takes years to complete. We expect to continue to incur significant expenses and increasing operating losses as we conduct clinical trials of oral sulopenem and sulopenem, including the ongoing Phase 3 clinical trial and non-clinical development being conducted in response to the CRL, seek marketing approval for oral sulopenem if clinical trials are successful, engage in pre-commercialization activities, and pursue the development of our sulopenem program in additional indications, including through preclinical and clinical development. If we obtain marketing approval for oral sulopenem, sulopenem or any future product candidate and undertake commercialization activities, we expect to incur significant commercialization expenses related to product sales, marketing, distribution and manufacturing. Some of these expenses may be incurred in advance of marketing approval, and could be substantial.

Based on our current operating plan, we estimate that our cash, cash equivalents and short-term investments as of December 31, 2022 should be sufficient to fund our operating expenses until mid-2024. However, we have based this estimate on assumptions that may prove to be wrong, and our operating plans may change as a result of many factors and various risks and uncertainties.

We will be required to obtain further funding through public or private equity offerings, debt financings, collaborations and licensing arrangements or other sources. Adequate additional financing may not be available to us on acceptable terms, or at all. Although we have successfully raised capital in the past, there is no assurance that we will be successful in obtaining sufficient funding on terms acceptable to us to fund continuing operations, if at all. If we fail to obtain financing when needed or on acceptable terms, we could be forced to delay, reduce or eliminate our product development programs or commercialization efforts, which would have a negative effect on our financial condition and our ability to develop and commercialize our sulopenem program and otherwise pursue our business strategy.

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Changing circumstances could cause us to consume capital significantly faster than we currently anticipate, and we may need to spend more than currently expected because of circumstances beyond our control. Our future funding requirements, both short-term and long-term, will depend on many factors, including:

•the timing and costs of our clinical trials of oral sulopenem and sulopenem, including any clinical trials or non-clinical studies which may be required for regulatory approval of our product candidates, including the ongoing Phase 3 clinical trial being conducted in response to the CRL and to support a potential resubmission of the NDA for approval of oral sulopenem;

•any other activities that may be required in connection with the potential resubmission of the NDA for oral sulopenem;

•the timing of regulatory filings including a potential resubmission of the NDA for oral sulopenem;

•the timing of regulatory review and potential approval of any product candidates, including oral sulopenem for the treatment of uUTI;

•the initiation, progress, timing, costs and results of preclinical studies and clinical trials of other potential product candidates and of our current product candidates in additional indications;

•the amount of funding that we receive under government awards that we may apply for in the future;

•the number and characteristics of product candidates that we pursue;

•the outcome, timing and costs of seeking regulatory approvals;

•the costs of commercialization activities for oral sulopenem and/or sulopenem and other product candidates if we receive marketing approval, including the costs and timing of establishing product sales, marketing, distribution and manufacturing capabilities;

•the receipt of marketing approval and revenue received from any potential commercial sales of oral sulopenem and/or sulopenem;

•the terms and timing of any future collaborations, licensing or other arrangements that we may establish;

•the amount and timing of any payments we may be required to make, or that we may receive, in connection with the licensing, filing, prosecution, defense and enforcement of any patents or other intellectual property rights, including milestone and royalty payments and patent prosecution fees that we are obligated to pay pursuant to an exclusive license agreement with Pfizer Inc. (Pfizer) (the Pfizer License) or other future license agreements;

•the amount and timing of any payments we may be required to make in connection with the RLNs and the repayment of the Exchangeable Notes, if required;

•the costs of preparing, filing and prosecuting patent applications, maintaining and protecting our intellectual property rights and defending against any intellectual property related claims;

•the costs of operating as a public company;

•the extent to which we in-license or acquire other products and technologies; and

•the outcome, impact, effects and results of our evaluation of corporate, strategic, financial and financing alternatives, including the terms, timing, structure, value, benefits and costs of any corporate, strategic, financial or financing alternative and our ability to complete one at all.

Our financial statements include substantial non-operating gains or losses resulting from required quarterly revaluation under generally accepted accounting principles of our outstanding derivative instruments.

Generally accepted accounting principles in the United States require that we report the value of certain derivatives in instruments we have issued as liabilities on our balance sheet and report changes in the value of these derivatives as non-operating gains or losses on our statement of operations. The value of the derivatives is required to be recalculated (and resulting non-operating gains or losses reflected in our statement of operations and resulting adjustments to the associated liability amounts reflected on our balance sheet) on a quarterly basis. The valuations are based upon a number of factors and estimates, including estimates based upon management's judgment. Certain of the derivative values are directly correlated to the value of our ordinary shares. Due to the nature of the required calculations and the large number of ordinary shares involved in such calculations, changes in our share price and/or changes in management's assumptions may result in significant changes in the value of the derivatives and resulting gains and losses on our statement of operations.

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In light of the FDA’s CRL regarding our NDA for oral sulopenem, we halted any remaining pre-commercial activities while we work toward our goal of approval of oral sulopenem. Neither resubmission nor approval of our NDA for oral sulopenem is assured.

In July 2021, we received a CRL from the FDA regarding our NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen. In light of the CRL and in order to reduce operating expenses and conserve cash resources, we have halted all remaining pre-commercial activities for oral sulopenem.

In the CRL, the FDA determined that additional data are necessary to support approval for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone. The FDA recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. There can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing Phase 3 clinical trial intended to support a resubmission of our NDA or that any data generated by such trial will be adequate to support resubmission or approval of our NDA.

Provisions in the EN Indenture and RLN Indenture may deter or prevent us from raising additional capital to fund our operations.

Provisions in the agreements we entered into in connection with our financings may deter or prevent us from raising additional capital to fund our operations as and when needed. For example, the indenture governing the Exchangeable Notes (the EN Indenture) contains negative covenants prohibiting our wholly owned subsidiary, Iterum Therapeutics Bermuda Limited (Iterum Bermuda), as well as us and our wholly owned subsidiaries and their subsidiaries (the Guarantors), who guaranteed Iterum Bermuda’s obligations under the Exchangeable Notes, from, among other things, incurring any indebtedness that is not permitted by the EN Indenture and entering into transactions with significant shareholders (as defined in the EN Indenture). In addition, the indenture governing the RLNs (the RLN Indenture) contains negative covenants prohibiting Iterum Bermuda and the Guarantors from, among other things, selling, transferring or assigning certain assets and taking other actions outside the ordinary course of business that would reasonably be expected to reduce the amount of payments under the RLNs.

These provisions could deter or prevent us from raising additional capital. Our failure to raise capital as and when needed would have a negative effect on our financial condition and our ability to develop and commercialize our sulopenem program and otherwise pursue our business strategy.

We are heavily dependent on the success of our sulopenem program, and our ability to develop, obtain marketing approval for and successfully commercialize oral sulopenem and sulopenem. If we are unable to achieve and sustain profitability, the market value of our ordinary shares will likely decline.

Our ability to become and remain profitable depends on our ability to generate revenue. To date, we have invested substantially all of our efforts and financial resources in the development of oral sulopenem and sulopenem, which are currently our two product candidates in development. Our prospects, including our ability to finance our operations and generate revenue from product sales, currently depend entirely on the development and commercialization of our sulopenem program.

We do not expect to generate significant revenue unless and until we obtain marketing approval for, and commercialize, oral sulopenem and/or sulopenem. Our ability to generate future revenue from product sales will require us to be successful in a range of challenging clinical and commercial activities, including:

•resolving the matters set out in the CRL received in July 2021 in connection with our NDA for oral sulopenem;

•enrolling and successfully completing any clinical trials that may be required for regulatory approval of our product candidates, including the ongoing Phase 3 clinical trial being conducted in response to the CRL;

•applying for and obtaining marketing approval for oral sulopenem and/or sulopenem;

•protecting and maintaining our rights to our intellectual property portfolio related to our sulopenem program;

•establishing and maintaining supply and manufacturing relationships with third parties that can support clinical development and can provide adequate commercial quantities of oral sulopenem and/or sulopenem, if approved;

•establishing sales, marketing and distribution capabilities either directly or through a third-party, to commercialize oral sulopenem and/or sulopenem or entering into collaboration arrangements for the commercialization of oral sulopenem and/or sulopenem where we choose not to commercialize directly ourselves; and

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•obtaining market acceptance of oral sulopenem and/or sulopenem as viable treatment options.

Because of the numerous risks and uncertainties associated with developing pharmaceutical products, we are unable to predict the extent of any future losses or when, or if, we will become profitable. We may never succeed in any or all of these activities and, even if we do, we may never generate revenue that is significant or large enough to achieve profitability. Our expenses could increase if we are required by the FDA, the European Medicines Agency (EMA), or any comparable foreign regulatory authority, to perform different studies or studies in addition to those currently expected, including in response to the CRL received in July 2021, or if there are any delays in completing such studies or with the development of our sulopenem program or any future product candidates. Even if oral sulopenem or sulopenem are approved for commercial sale, we anticipate incurring significant costs associated with the commercial launch of oral sulopenem and/or sulopenem. Where we enter into collaboration arrangements with third-party collaborators for commercialization of product candidates, our product revenues or the profitability of these product revenues to us would likely be lower than if we were to directly market and sell products in those markets.

Our failure to become and remain profitable would decrease the value of our company and could impair our ability to raise capital, maintain our research and development efforts, expand our business or continue our operations. A decline in the value of our company could cause our shareholders to lose all or part of their investment.

Our indebtedness imposes certain operating and other restrictions on us and could adversely affect our ability to raise additional capital.

The EN Indenture and the RLN Indenture each contain affirmative and negative covenants which impose operating and other restrictions on us, including, among other things, incurring any indebtedness that is not permitted by the EN Indenture or amending the terms of any subordinated indebtedness, entering into strategic transactions or transferring any material assets and undergoing a change of control transaction (subject to certain exceptions, including in the case of a change of control transaction, a transaction in which each holder of an outstanding Exchangeable Note receives cash consideration of at least 300% of the outstanding principal amount of such Exchangeable Notes). For example, pursuant to the EN Indenture, we are required to obtain the consent of a portion of the holders of the Exchangeable Notes prior to entering into collaboration agreements, exclusive selling arrangements or similar partnerships including a definitive agreement for commercialization services in the United States. Failure to comply with these terms could result in an event of default which could lead, among other things, to an acceleration of amounts due under the EN Indenture and the obligation to pay default interest. Moreover, obtaining a consent to a waiver of these terms is subject to a veto right of the holders of 30% of the outstanding Exchangeable Notes, in the case of the EN Indenture, and 30% of the outstanding RLNs, in the case of the RLN Indenture, and must include Sarissa Capital Offshore Master Fund LP, Sarissa Capital Catapult Fund LLC and Sarissa Capital Hawkeye Fund LP (collectively with their affiliates, Sarissa) so long as Sarissa and its affiliates own at least 10% of the outstanding RLNs. This veto right could make it more difficult for us to obtain a waiver than would otherwise be the case. In addition, the rate at which the Exchangeable Notes are exchangeable for our ordinary shares is subject to adjustment, including pursuant to anti-dilution protections. For example, following the sales made under an at the market offering (ATM) pursuant to the Sales Agreement entered into with HC Wainwright, as agent, on October 7, 2022, as of March 15, 2023, the exchange rate of the Exchangeable Notes increased and the exchange price of the Exchangeable Notes adjusted to $11.3107 per ordinary share (at an adjusted exchange rate of 88.4122 shares per $1,000 of principal and interest on the Exchangeable Notes). As of December 31, 2022, $12.6 million aggregate principal amount of Exchangeable Notes remained outstanding.

Depending on the public offering prices, the number of shares that we sell pursuant to our Sales Agreement with HC Wainwright as agent and any potential increase to the exchange rate of the Exchangeable Notes, we may not have sufficient authorized share capital or share issuance authorities to convert all of the Exchangeable Notes into ordinary shares following any sales of shares pursuant to the Sales Agreement and could be required to settle any exchanges with cash to the extent we do not have available authorized shares. If we elect to settle any exchanges in cash, or we do not have authorized and available ordinary shares needed to satisfy physical exchange of the Exchangeable Notes, our liquidity could be adversely affected and/or we may not have sufficient cash available at that time to satisfy such cash settlement. In addition, in the event we elect to settle exchanges of Exchangeable Notes with ordinary shares, we would be limited in our ability to issue equity for other purposes which could adversely affect our shareholders and our ability to raise additional capital. During the year ended December 31, 2022, we sold 356,933 ordinary shares under the Sales Agreement at an average price of $1.25 per share for net proceeds of $0.4 million.

In addition, the exercise price and the number of shares issuable under our outstanding warrants are subject to adjustment pursuant to the terms of the applicable warrant. This indebtedness could make it more difficult for us to raise additional capital to fund our operations.

Servicing our indebtedness will require a significant amount of cash, and we may not have sufficient cash flow from our business to pay our indebtedness.

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Our ability to make payments of the principal of, to pay interest and special interest on the Exchangeable Notes, or to make cash payments, if we so elect, in connection with any exchange of Exchangeable Notes depends on our future performance, which is subject to economic, financial, competitive and other factors beyond our control. Our business may not generate cash flow sufficient to service the Exchangeable Notes or other indebtedness and make necessary capital expenditures. If we are unable to generate such cash flow, we may be required to adopt one or more alternatives, such as selling assets, restructuring indebtedness or obtaining additional equity capital on terms that may be onerous or highly dilutive. Our ability to refinance indebtedness will depend on the capital markets and our financial condition at such time. We may not be able to engage in any of these activities or engage in these activities on desirable terms, which could result in a default on our debt obligations.

We may incur substantially more debt or take other actions that would intensify the risks discussed above.

We and our subsidiaries may be able to incur substantial additional debt in the future, subject to the restrictions contained in our current and future debt instruments, some of which may be secured debt. While the EN Indenture restricts our ability to incur additional indebtedness, it allows for certain additional indebtedness and any such restrictions may be waived. If new debt is added to our current debt levels, the related risks that we now face could intensify.

We may not have the ability to raise the funds necessary to settle exchanges of the Exchangeable Notes in cash or to repurchase the Exchangeable Notes upon a fundamental change, and our future debt may limit our ability to pay cash upon exchange or repurchase of the Exchangeable Notes.

Holders of the Exchangeable Notes will have the right to require us to repurchase all or a portion of their Exchangeable Notes upon the occurrence of a fundamental change at specified repurchase prices. In addition, upon exchange of the Exchangeable Notes, unless we elect to deliver solely ordinary shares to settle such exchange (other than paying cash in lieu of delivering any fractional share), we would be required to make specified cash payments in respect of the Exchangeable Notes being exchanged. However, we may not have enough available cash or be able to obtain financing at the time we are required to make repurchases of Exchangeable Notes surrendered therefor or to pay cash with respect to Exchangeable Notes being exchanged. In addition, our ability to repurchase or to pay cash upon exchange of the Exchangeable Notes may be limited by law, regulatory authority, and future indebtedness.

Our failure to repurchase Exchangeable Notes at a time when the repurchase is required by the EN Indenture or to pay cash upon exchange of the Exchangeable Notes as required by the EN Indenture would constitute a default under the EN Indenture. A default under the EN Indenture or a fundamental change itself could also lead to a default under agreements governing our future indebtedness. If the payment of the related indebtedness were to be accelerated after any applicable notice or grace periods, we may not have sufficient funds to repay the indebtedness and any accrued and unpaid interest and repurchase the Exchangeable Notes or to pay cash upon exchange of the Exchangeable Notes. As of December 31, 2022, $12.6 million aggregate principal amount of Exchangeable Notes remained outstanding.

The exchange feature of the Exchangeable Notes may adversely affect our financial condition and operating results.

Beginning January 21, 2021 and prior to the earlier of (i) the close of business on the scheduled trading day immediately preceding a mandatory exchange notice for the Exchangeable Notes, which would be triggered by the occurrence of any of certain mandatory exchange trigger events specified in the EN Indenture, and (ii) the close of business on the second scheduled trading day immediately preceding the interest record date, holders of Exchangeable Notes are entitled to exchange the Exchangeable Notes at any time at their option. If holders continue to elect to exchange their Exchangeable Notes, unless we elect to satisfy our exchange obligation by delivering solely ordinary shares (other than paying cash in lieu of delivering any fractional share), we would be required to settle a portion or all of our exchange obligation in cash, which could adversely affect our liquidity. The relevant accounting rules require that we recognize liabilities which appropriately reflect our obligations specified in the EN Indenture. Therefore, even if holders do not elect to exchange their Exchangeable Notes, our liabilities and statement of operations could be significantly impacted.

Raising additional capital may cause dilution to our shareholders, restrict our operations or require us to relinquish rights to our technologies or product candidates.

Unless and until we can generate a substantial amount of revenue from our sulopenem program or future product candidates, we expect to finance our future cash needs through equity offerings, debt financings, collaboration agreements, other third-party funding, strategic alliances, licensing arrangements, marketing and distribution arrangements or government funding.

We may seek additional capital due to favorable market conditions or strategic considerations, even if we believe that we have sufficient funds for our current or future operating plans.

On October 7, 2022, we filed a universal shelf registration statement on Form S-3 with the SEC, which was declared effective on October 17, 2022 (File No. 333-267795), and pursuant to which we registered for sale up to $100.0 million of any combination of our debt securities, ordinary shares, preferred shares, subscription rights, purchase contracts, units and/or warrants

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from time to time and at prices and on terms that we may determine. The extent to which we are able to utilize a shelf registration statement as a source of funding will depend on a number of factors, including the prevailing market price of our ordinary shares, general market conditions and applicability of restrictions on our ability to utilize the shelf registration statement to sell more than one-third of the market value of our public float, meaning the aggregate market value of voting and non-voting ordinary shares held by non-affiliates, in any trailing 12-month period.

On October 7, 2022, we entered into the Sales Agreement with HC Wainwright, as agent, pursuant to which we may offer and sell ordinary shares, nominal value $0.01 per share for aggregate gross sales proceeds of up to $16.0 million (not to exceed 4,478,180), from time to time through HC Wainwright, by any method permitted that is deemed to be an "at the market offering" as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended.

Our issuance of additional securities, whether equity or debt, or the possibility of such issuance, may cause the market price of our ordinary shares to decline, and our shareholders may not agree with our financing plans or the terms of such financings. To the extent that we raise additional capital through the sale of ordinary shares, convertible securities or other equity securities, the ownership interests of our then existing shareholders may be materially diluted, and the terms of these securities could include liquidation or other preferences and antidilution protections that could adversely affect the rights of our then existing shareholders. Further debt financing, if available, would result in increased fixed payment obligations and may involve agreements that include restrictive covenants that limit our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends, which could adversely affect our ability to conduct our business. In addition, securing additional financing would require a substantial amount of time and attention from our management and may divert a disproportionate amount of their attention away from day-to-day activities, which may adversely affect our management’s ability to oversee the development of our product candidates.

If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams or product candidates or grant licenses on terms that may not be favorable to us.

We may expend our limited resources to pursue a particular product candidate or indication and fail to capitalize on product candidates or indications that may be more profitable or for which there is a greater likelihood of success.

Because we have limited financial resources, we initially focused our sulopenem development program on the specific indications of uUTI, complicated urinary tract infections (cUTI) and complicated intra-abdominal infections (cIAI), all of which are focused on what we believe to be the most pressing near-term medical needs, in terms of both their potential for marketing approval and commercialization. As a result, we may forego or delay pursuit of opportunities with other potential product candidates or developing our sulopenem program in other indications that may prove to have greater commercial potential. For example, while we believe that sulopenem has the potential to treat cIAIs and cUTIs in humans based on the results of prior preclinical studies and clinical trials, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapy in our Phase 3 cIAI and cUTI clinical trials. While we believe the secondary supporting analyses and safety data in all three prior Phase 3 clinical trials support the potential of sulopenem in the treatment of multi-drug resistant infections, we cannot guarantee that these supporting analyses are indicative of efficacy of sulopenem in treating cIAIs or cUTIs. Similarly, while we believe that sulopenem has the potential to treat uUTIs in humans based on the results of prior preclinical studies and clinical trials, oral sulopenem did not meet the primary endpoint of statistical non-inferiority compared to ciprofloxacin in the population of patients with baseline pathogens susceptible to ciprofloxacin in our prior Phase 3 uUTI clinical trial. However, in the uUTI clinical trial, in the population of patients with baseline pathogens resistant to quinolones, sulopenem achieved the related primary endpoint by demonstrating statistical significance in the overall response rate by treatment arm in the ciprofloxacin-resistant population, providing evidence of a treatment effect in patients with uUTI. Based on discussions with the FDA at a pre-NDA meeting in September 2020 and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. We received a CRL from the FDA on July 23, 2021 for our NDA. The CRL provided that the FDA had completed its review of the NDA and had determined that it could not approve the NDA in its present form. The CRL further provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. There can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing

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Phase 3 clinical trial intended to support a resubmission of our NDA or that any data generated by such clinical trial will be adequate to support resubmission or approval of our NDA.

Further, due to a variety of factors, including those described in this “Risk Factors” section, we may nonetheless be delayed in obtaining or ultimately be unable to obtain FDA approval for oral sulopenem for uUTI or any other indication or for any other product or to successfully commercialize sulopenem.

Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market opportunities. Our spending on current and future research and development programs and product candidates for specific indications may not yield any commercially viable product candidates. If we do not accurately evaluate the commercial potential or target market for a particular product candidate, we may relinquish valuable rights to that product candidate through collaboration, licensing or other royalty arrangements in cases in which it would have been more advantageous for us to retain sole development and commercialization rights to the product candidate.

We have broad discretion in the use of our funds and may not use them effectively.

We have broad discretion in the application of our available funds and could spend the funds in ways that do not improve our results of operations or enhance the value of our ordinary shares. Our failure to apply these funds effectively could result in financial losses that could have a material adverse effect on our business, cause the price of our ordinary shares to decline and delay the development of our product candidates. Pending their use, we may invest funds in a manner that does not produce income or that loses value.

We hold our cash and cash equivalents that we use to meet our working capital and operating expense needs in deposit accounts that could be adversely affected if the financial institutions holding such funds fail.

We hold our cash and cash equivalents that use to meet our working capital and operating expense needs in deposit accounts at multiple financial institutions. The balance held in these accounts typically exceeds the Federal Deposit Insurance Corporation (“FDIC”), standard deposit insurance limit or similar government guarantee schemes. If a financial institution in which we hold such funds fails or is subject to significant adverse conditions in the financial or credit markets, we could be subject to a risk of loss of all or a portion of such uninsured funds or be subject to a delay in accessing all or a portion of such uninsured funds. Any such loss or lack of access to these funds could adversely impact our short-term liquidity and ability to meet our operating expense obligations.

For example, on March 10, 2023, Silicon Valley Bank (“SVB”), and Signature Bank, were closed by state regulators and the FDIC was appointed receiver for each bank. The FDIC created successor bridge banks and all deposits of SVB and Signature Bank were transferred to the bridge banks under a systemic risk exception approved by the United States Department of the Treasury, the Federal Reserve and the FDIC. If financial institutions in which we hold funds for working capital and operating expenses were to fail, we cannot provide any assurances that such governmental agencies would take action to protect our uninsured deposits in a similar manner.

We also maintain investment accounts with other financial institutions in which we hold our investments and, if access to the funds we use for working capital and operating expenses is impaired, we may not be able to open new operating accounts or to sell investments or transfer funds from our investment accounts to new operating accounts on a timely basis sufficient to meet our operating expense obligations.

Risks Related to Clinical Development and Commercialization

We are heavily dependent on the success of our sulopenem program, and our ability to develop, obtain marketing approval for and successfully commercialize oral sulopenem and/or sulopenem. If we are unable to obtain marketing approvals for oral sulopenem or sulopenem, or if thereafter we fail to commercialize oral sulopenem or sulopenem or experience significant delays in doing so, our business will be materially harmed.

We currently have no products approved for sale and have invested substantially all of our efforts and financial resources in the development of our sulopenem program. Our near-term prospects are substantially dependent on our ability to develop, apply for and obtain marketing approval for and successfully commercialize oral sulopenem and/or sulopenem. The success of our sulopenem program will depend on several factors, including the following:

•resolving the issues set out in the CRL received in July 2021 in connection with our NDA for oral sulopenem;

•successful enrollment in, and completion of, clinical trials, including any clinical trials that may be required for regulatory approval of our product candidates, including the ongoing Phase 3 trial being conducted in response to the CRL;

•clinical trial results with safety, tolerability and efficacy profiles that are satisfactory to the FDA or any comparable foreign regulatory authority;

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•timely completion of any additional clinical trials and non-clinical studies conducted to support the filing for regulatory approvals of our sulopenem program, if required by the FDA or any comparable foreign regulatory authority, including the ongoing Phase 3 clinical trial and non-clinical studies being conducted in response to the CRL;

•receipt of marketing approvals from applicable regulatory authorities;

•establishment and maintenance of arrangements with third-party manufacturers to obtain commercial supply at a scale sufficient to meet anticipated demand and at a cost appropriate for our commercialization;

•acquisition and maintenance of patent, trade secret and other intellectual property protection and regulatory exclusivity, both in the United States and internationally, including our ability to maintain the Pfizer License;

•protection of our rights in our intellectual property portfolio;

•launch of commercial sales of oral sulopenem and/or sulopenem, if approved, whether alone or in collaboration with others;

•the effectiveness of our own or any future collaborators’ marketing, sales and distribution strategy and operations;

•acceptance of oral sulopenem and/or sulopenem, if approved, by patients, physicians and the medical community at large;

•our ability to obtain and sustain coverage and an adequate level of reimbursement by third-party payors;

•the prevalence, frequency and severity of adverse side effects of oral sulopenem and/or sulopenem;

•the availability, perceived advantages, relative cost and relative efficacy of alternative and competing therapies; and

•an acceptable safety profile of oral sulopenem and/or sulopenem following approval.

Many of these factors are beyond our control, including clinical development, the regulatory submission process, potential threats to our intellectual property rights, manufacturing and the impact of competition.

Based on discussions with the FDA at a pre-NDA meeting in September 2020 and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. We received a CRL from the FDA on July 23, 2021 in respect of our NDA. The CRL provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. There can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing Phase 3 clinical trial intended to support a resubmission of our NDA or that any data generated by such clinical trial will be adequate to support resubmission or approval of our NDA. As we work with the FDA to resolve the issues set out in the CRL, we will be delayed in obtaining, and may ultimately be unable to obtain, FDA approval for sulopenem for this or any other indication or for any other product or to successfully commercialize sulopenem.

If we are unable to develop, receive marketing approval for, or successfully commercialize oral sulopenem and/or sulopenem, or if we experience delays as a result of any of these factors or otherwise, our business could be materially harmed.

Our company has no experience in obtaining regulatory approval for a drug.

Our company has never obtained regulatory approval for, or commercialized, a drug. We must complete extensive preclinical and clinical trials to demonstrate the safety and efficacy of our product candidates in humans before we will be able to obtain these approvals. To gain approval to market a product candidate, we must provide the FDA and foreign regulatory authorities with non-clinical, clinical and chemistry, manufacturing, and controls (CMC) data that adequately demonstrates the safety and efficacy of the product for the intended indication(s) applied for in the NDA(s) or other respective regulatory filing.

We may never succeed in achieving regulatory approval for any of our product candidates. For example, in the results of our cIAI clinical trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapy for the cIAI trial. In the second quarter of 2020, we announced the results of our Phase 3 clinical trials of sulopenem for the treatment of cUTI

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and uUTI. In the cUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapies with the difference in response rates driven almost entirely by higher rates of asymptomatic bacteriuria on the sulopenem IV to oral sulopenem arm relative to the ertapenem IV to oral ciprofloxacin arm, only evident at the test of cure visit; the rates of patients receiving additional antibiotics or with residual cUTI symptoms were similar between therapies. Similarly, in the uUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to ciprofloxacin in the population of patients with baseline pathogens susceptible to ciprofloxacin driven to a large degree by a greater amount of asymptomatic bacteriuria in the sulopenem treated patients at the test of cure visit relative to those receiving ciprofloxacin. However, in the uUTI trial, in the population of patients with baseline pathogens resistant to quinolones, sulopenem achieved the related primary endpoint by demonstrating statistical significance in the overall response rate by treatment arm in the ciprofloxacin-resistant population, providing evidence of a treatment effect in patients with uUTI. Notwithstanding failure to meet the endpoints described above, in all three Phase 3 clinical trials, at all timepoints measured, the clinical response to sulopenem and/or oral sulopenem was similar to the comparator regimen (non-inferior), except in the instance of the quinolone non-susceptible population in the prior Phase 3 uUTI trial in which oral sulopenem was statistically superior. Based on discussions with the FDA at a pre-NDA meeting in September 2020 and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. We received a CRL from the FDA on July 23, 2021 for our NDA. The CRL provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. Depending on the extent of these or any other FDA-required studies, approval of any NDA(s) or other application that we submit may be significantly delayed, possibly for several years, or may require us to expend more resources than we have available. There can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing Phase 3 clinical trial intended to support a resubmission of our NDA or that any data generated by such clinical trial will be adequate to support resubmission or approval of our NDA.

We may elect to discontinue, delay or modify clinical trials of some product candidates or focus on others. Any changes in the outcome of any of these variables with respect to the development of our product candidates in clinical development could mean a significant change in the costs and timing associated with the development of these product candidates.

Additionally, any failure or delay in obtaining regulatory approvals would prevent us from commercializing oral sulopenem and/or sulopenem, generating revenues and achieving and sustaining profitability. It is also possible that additional studies, if performed and completed, may not be considered sufficient by the FDA to approve any NDA(s) or other application that we submit. If any of these outcomes occur, we may be forced to abandon the development of our product candidates, which would materially adversely affect our business and could potentially cause us to cease operations. We face similar risks for our applications in other countries.

If clinical trials of oral sulopenem, sulopenem or any other product candidate that we may advance to clinical trials fail to demonstrate safety and efficacy to the satisfaction of the FDA or comparable foreign regulatory authorities, or do not otherwise produce favorable results, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and commercialization of oral sulopenem, sulopenem or any other product candidate.

We may not commercialize, market, promote, or sell any product candidate in the United States without obtaining marketing approval from the FDA or in other countries without obtaining approvals from comparable foreign regulatory authorities, such as the EMA, and we may never receive such approvals. Clinical testing is expensive, difficult to design and implement, can take many years to complete and is inherently uncertain as to outcome. While we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020, for which we received a CRL from the FDA on July 23, 2021, we had not previously submitted an NDA to the FDA or similar applications to comparable foreign regulatory authorities for any of our product candidates.

Our business currently heavily depends on the successful development, regulatory approval and commercialization of our sulopenem program. The clinical development of our sulopenem program, or any future product candidates, is susceptible to the risk of failure inherent at any stage of drug development, including failure to demonstrate efficacy in a clinical trial or across a broad population of patients, the occurrence of severe adverse events, failure to comply with protocols or applicable regulatory requirements, and determination by the FDA or any comparable foreign regulatory authority that a drug product is not approvable. A number of companies in the pharmaceutical industry, including biotechnology companies, have suffered significant setbacks in clinical trials, even after promising results in earlier non-clinical studies or clinical trials. The results of preclinical and other non-clinical studies

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and/or early clinical trials of our product candidates or future product candidates may not be predictive of the results of later-stage clinical trials and interim results of a clinical trial do not necessarily predict final results. Notwithstanding any promising results in early non-clinical studies or clinical trials, we cannot be certain that we will not face similar setbacks.

Preclinical and clinical data are often susceptible to varying interpretations and analyses. Although data from clinical trials of oral sulopenem and sulopenem provides support for the overall safety profile of the product candidates, many companies that believed their product candidates performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval for the product candidates. Even if we believe that the results of our clinical trials warrant marketing approval, the FDA or comparable foreign regulatory authorities may disagree and may not grant marketing approval of our product candidates. For example, we received a CRL from the FDA on July 23, 2021 for our NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen. The CRL provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. Notwithstanding our interactions with the FDA to date, there can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing Phase 3 clinical trial intended to support a resubmission of our NDA or that any data generated by such clinical trial will be adequate to support resubmission or approval of our NDA.

In some instances, there can be significant variability in safety and/or efficacy results between different clinical trials of the same product candidate due to numerous factors, including changes in trial procedures set forth in protocols, differences in the size and type of the patient populations, adherence to the dosing regimen and other trial protocols and the rate of dropout among clinical trial participants, among others. It is possible that even if one or more of our product candidates has a beneficial effect, that effect will not be detected during clinical evaluation as a result of one of the factors listed or otherwise. Conversely, as a result of the same factors, our clinical trials may indicate an apparent positive effect of a product candidate that is greater than the actual positive effect, if any. Similarly, in our clinical trials, we may fail to detect toxicity of or intolerability of our product candidates or may determine that our product candidates are toxic or not well tolerated when that is not in fact the case. In the case of our clinical trials, results may differ on the basis of the type of bacteria with which patients are infected. We cannot assure our shareholders that any clinical trials that we are conducting or other clinical trials that we may conduct will demonstrate consistent or adequate efficacy and safety to obtain regulatory approval to market our product candidates.

We may encounter unforeseen events prior to, during, or as a result of, clinical trials that could delay or prevent us from obtaining regulatory approval for oral sulopenem, sulopenem or any of our other product candidates, including:

•although we conducted our prior Phase 3 clinical trials pursuant to SPA agreements, the FDA or other comparable foreign regulatory authorities may ultimately disagree as to the design or implementation of such clinical trials or other clinical trials, or may request additional data to support approval, such as that requested in the CRL from July 2021;

•although we are conducting the additional Phase 3 clinical trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) pursuant to an SPA agreement, there is no guarantee that the FDA, or any other regulatory authorities, will approve any application that is supported by a clinical trial conducted in accordance with such agreement;

•we may not reach agreement on acceptable terms with all clinical trial sites, the terms of which can be subject to extensive negotiation and may vary significantly among different trial sites;

•clinical trials of our product candidates, including the ongoing Phase 3 clinical trial being conducted in response to the CRL, may produce unfavorable or inconclusive results;

•we may decide, or regulators may require us, to conduct additional clinical trials or abandon product development programs;

•our third-party contractors, including those manufacturing our product candidates or conducting clinical trials on our behalf, may fail to comply with regulatory requirements or meet their contractual obligations to us in a timely manner, or at all;

•the FDA, the local National Health Authorities or institutional review boards may not authorize us or our investigators to commence a clinical trial or conduct a clinical trial at a prospective trial site;

•we may have to suspend or terminate clinical trials of a product candidate for various reasons, including non-compliance with regulatory requirements or a finding that the participants are being exposed to unacceptable health risks, undesirable side effects or other unexpected characteristics of the product candidate;

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•the FDA or comparable foreign regulatory authorities may fail to approve the manufacturing processes or facilities of third-party manufacturers with which we enter into agreement for clinical and commercial supplies; or

•the supply or quality of our product candidates or other materials necessary to conduct clinical trials of our product candidates may be insufficient or inadequate.

If we are required to conduct additional clinical trials or other testing of oral sulopenem, sulopenem or any other product candidate beyond the clinical trials and testing that we contemplate, if we are unable to successfully complete clinical trials or other testing of our product candidates, if the results of these clinical trials or tests are unfavorable or are only modestly favorable or if there are safety concerns associated with oral sulopenem, sulopenem or any other product candidate, we may:

•incur additional unplanned costs;

•be delayed in obtaining marketing approval for our product candidates;

•not obtain marketing approval at all;

•obtain approval for indications or patient populations that are not as broad as intended or desired;

•obtain approval with labeling that includes significant use or distribution restrictions or significant safety warnings, including boxed warnings;

•be subject to additional post-marketing testing or other requirements; or

•be required to remove the product from the market after obtaining marketing approval.

In addition, the FDA’s and other regulatory authorities’ policies with respect to clinical trials may change and additional government regulations may be enacted. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies governing clinical trials, our development plans may be impacted. For example, in December 2022, with the passage of the Food and Drug Omnibus Reform Act (FDORA), Congress required sponsors to develop and submit a diversity action plan for each phase 3 clinical trial or any other “pivotal study” of a new drug or biological product. These plans are meant to encourage the enrollment of more diverse patient populations in late-stage clinical trials of FDA-regulated products. Specifically, action plans must include the sponsor’s goals for enrollment, the underlying rationale for those goals, and an explanation of how the sponsor intends to meet them. In addition to these requirements, the legislation directs the FDA to issue new guidance on diversity action plans.

In addition, the regulatory landscape related to clinical trials in the European Union recently evolved. The EU Clinical Trials Regulation (CTR) which was adopted in April 2014 and repeals the EU Clinical Trials Directive, became applicable on January 31, 2022. While the Clinical Trials Directive required a separate clinical trial application (CTA) to be submitted in each member state, to both the competent national health authority and an independent ethics committee, the CTR introduces a centralized process and only requires the submission of a single application to all member states concerned. The CTR allows sponsors to make a single submission to both the competent authority and an ethics committee in each member state, leading to a single decision per member state. The assessment procedure of the CTA has been harmonized as well, including a joint assessment by all member states concerned, and a separate assessment by each member state with respect to specific requirements related to its own territory, including ethics rules. Each member state’s decision is communicated to the sponsor via the centralized EU portal. Once the CTA is approved, clinical study development may proceed.

If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies governing clinical trials, our development plans may be impacted.

Our failure to successfully initiate and complete clinical trials of our product candidates and to demonstrate the efficacy and safety necessary to obtain regulatory approval to market any of our product candidates would significantly harm our business. Significant clinical trial delays also could shorten any periods during which we may have the exclusive right to commercialize our product candidates or allow our competitors to bring products to market before we do and impair our ability to successfully commercialize our product candidates, which may harm our business and results of operations. In addition, many of the factors that cause, or lead to, delays of clinical trials may ultimately lead to the denial of regulatory approval of oral sulopenem, sulopenem or any other product candidate.

If we experience delays or difficulties in the enrollment of patients in clinical trials, clinical development activities could be delayed or otherwise adversely affected.

The timely completion of clinical trials in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of patients who remain in the study until its conclusion. While we successfully completed enrollment for all

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three of our prior Phase 3 clinical trials, we may not be able to initiate and/or continue or complete other clinical trials (including the ongoing Phase 3 clinical trial being conducted in response to the CRL) of oral sulopenem, sulopenem or any other product candidate that we develop if we are unable to locate and enroll a sufficient number of eligible patients to participate in clinical trials as required by the FDA or comparable foreign regulatory authorities, such as the EMA. Patient enrollment is a significant factor in the timing of clinical trials, and is affected by many factors, including:

•the size and nature of the patient population;

•the severity of the disease under investigation;

•the proximity of patients to clinical sites;

•the eligibility criteria for participation in the clinical trial;

•the number of sites at which we conduct the trial and the speed at which we are able to open such sites;

•the prevalence of antibiotic resistance to pathogens where we conduct the clinical trial;

•the accuracy of certain estimates and assumptions upon which the design of the protocols are predicated;

•our ability to recruit clinical trial investigators with appropriate experience;

•competing clinical trials and clinicians’ and patients’ perceptions as to the potential advantages and risks of the product candidate being studied in relation to other available therapies, including any new drugs that may be approved for the indications that we are investigating;

•our ability to obtain and maintain patient consents; and

•the risk that patients enrolled in clinical trials will drop out of the clinical trials before completion.

The inclusion and exclusion criteria for any clinical trials of oral sulopenem and sulopenem may adversely affect our enrollment rates for patients in those clinical trials. In addition, we may face competition in enrolling suitable patients as a result of other companies conducting clinical trials for antibiotic product candidates that are intended to treat similar infections, resulting in slower than anticipated enrollment in our clinical trials. Enrollment delays in our clinical trials may result in increased development costs for oral sulopenem and/or sulopenem, or slow down or halt our product development for oral sulopenem and/or sulopenem.

Accordingly, our inability to enroll a sufficient number of patients for our clinical trials would result in significant delays or might require us to abandon one or more clinical trials altogether. Enrollment delays in our clinical trials, such as the ongoing clinical trial being conducted in response to the CRL, may result in increased development costs for our product candidates, slow down or halt our product candidate development and approval process and jeopardize our ability to seek and obtain the marketing approval required to commence product sales and generate revenue, which would cause the value of our company to decline and limit our ability to obtain additional financing if needed. Furthermore, we rely on and expect to continue to rely on contract research organizations (CROs) and clinical trial sites to ensure the proper and timely conduct of our clinical trials, and we have limited influence over their performance.

Success in non-clinical testing and early clinical trials does not ensure that later clinical trials will be successful, and we cannot assure our shareholders that any clinical trials that we may conduct will demonstrate consistent or adequate efficacy and safety to obtain regulatory approval to market our sulopenem program in any indication.

Although we believe that oral sulopenem and sulopenem have the potential to treat uUTI, cUTI and cIAI in humans based on the results of prior preclinical studies and clinical trials, we cannot guarantee that oral sulopenem and/or sulopenem will demonstrate the expected efficacy in clinical trial patients to the satisfaction of the FDA and/or other regulators. We also cannot guarantee that the projections made from the pharmacokinetic and pharmacodynamic models that we developed from non-clinical and clinical oral sulopenem and sulopenem studies will be validated in these clinical trials. For example, while we believe that sulopenem has the potential to treat cIAIs and cUTIs in humans based on the results of prior preclinical studies and clinical trials, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapy in our Phase 3 cIAI and cUTI clinical trials. While we believe the secondary supporting analyses and safety data in all three Phase 3 clinical trials support the potential of sulopenem in the treatment of multi-drug resistant infections, we cannot guarantee that these supporting analyses are indicative of efficacy of sulopenem in treating cIAI or cUTI. Similarly, while we believe that sulopenem has the potential to treat uUTI in humans based on the results of prior preclinical studies and clinical trials, and based on our prior Phase 3 uUTI clinical trial, in the population of patients with baseline pathogens resistant to quinolones, in which sulopenem met the related primary endpoint by demonstrating statistical significance in the overall response rate by treatment arm in the ciprofloxacin-resistant population, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to ciprofloxacin in the population of patients with baseline pathogens susceptible to ciprofloxacin in our prior Phase 3 uUTI clinical trial. Based on discussions with the FDA at a pre-NDA meeting and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTI in patients with a

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quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. On July 23, 2021, we received a CRL from the FDA in respect of the NDA. The CRL provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. There can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing Phase 3 clinical trial intended to support a resubmission of our NDA or that any data generated by such clinical investigation will be adequate to support resubmission or approval of our NDA.

Other companies in the pharmaceutical industry have frequently suffered significant setbacks in later clinical trials, even after achieving promising results in earlier non-clinical studies or clinical trials.

Serious adverse events or undesirable side effects or other unexpected properties of oral sulopenem, sulopenem or any other product candidate may be identified during development or after approval that could delay, prevent or cause the withdrawal of regulatory approval, limit the commercial potential, or result in significant negative consequences following marketing approval.

Serious adverse events or undesirable side effects caused by, or other unexpected properties of, our product candidates could cause us, an institutional review board (IRB), or regulatory authorities to interrupt, delay or halt our clinical trials and could result in a more restrictive label, the imposition of distribution or use restrictions or the delay or denial of regulatory approval by the FDA or comparable foreign regulatory authorities. If oral sulopenem, sulopenem or any of our other product candidates is associated with serious or unexpected adverse events or undesirable side effects, the FDA or the IRBs at the institutions in which our studies are conducted, could suspend or terminate our clinical trials or the FDA or comparable foreign regulatory authorities could order us to cease clinical trials or deny approval of our product candidates for any or all targeted indications. Treatment-related side effects could also affect patient recruitment or the ability of enrolled patients to complete the clinical trial or result in potential product liability claims. Any of these occurrences may harm our business, financial condition and prospects significantly.

To date, sulopenem and sulopenem etzadroxil have generally been well tolerated in clinical trials conducted in healthy subjects and patients and there were no safety issues found in any patients treated with sulopenem in our prior Phase 3 clinical trials. During the development of oral sulopenem and sulopenem, patients have experienced drug-related side effects including diarrhea, temporary increases in hepatic enzymes, allergic reactions, and rash.

While the active pharmaceutical ingredient in the bilayer tablet is sulopenem etzadroxil, the combination product with probenecid has not yet been tested extensively in patients. In the cIAI trial, patients received either sulopenem IV followed by sulopenem etzadroxil or ertapenem followed by ciprofloxacin/metronidazole or amoxicillin-clavulanate. Among 668 treated patients, treatment-related adverse events were observed in 6.0% and 5.1% of patients on sulopenem and ertapenem, respectively, with the most commonly reported drug-related adverse event being diarrhea, which was observed in 4.5% and 2.4% of patients on sulopenem and ertapenem, respectively. Discontinuations from treatment were uncommon for both regimens, occurring in 1.5% of patients on sulopenem and 2.1% of patients on ertapenem. Serious adverse events unrelated to study treatment were seen in 7.5% of patients on sulopenem and 3.6% of patients on ertapenem. In the cUTI trial, patients received either sulopenem IV followed by sulopenem etzadroxil, if eligible for oral therapy, or ertapenem IV followed by ciprofloxacin or amoxicillin-clavulanate, if eligible for oral therapy. Among 1,392 treated patients, treatment-related adverse events were observed in 6.0% and 9.2% of patients on sulopenem and ertapenem, respectively, with the most commonly reported adverse events being headache (3.0% and 2.2%), diarrhea (2.7% and 3.0%) and nausea (1.3% and 1.6%), on sulopenem and ertapenem, respectively. Discontinuations from treatment were uncommon for both regimens, occurring in 0.4% of patients on sulopenem and 0.6% of patients on ertapenem. Serious adverse events unrelated to study treatment were seen in 2.0% of patients on sulopenem and 0.9% of patients on ertapenem. In the uUTI trial, patients received either oral sulopenem or ciprofloxacin. Among 1,660 treated patients, treatment related adverse events were observed in 17.0% and 6.2% of patients on sulopenem and ciprofloxacin, respectively. The most commonly reported adverse events were diarrhea (12.4% and 2.5%), nausea (3.7% and 3.6%), and headache (2.2% and 2.2%), for sulopenem and ciprofloxacin patients, respectively. The difference in adverse events was driven by diarrhea which, in the majority of patients, was mild and self-limited. Overall discontinuations due to adverse events were uncommon on both regimens and were seen in 1.6% of patients on sulopenem and 1.0% of patients on ciprofloxacin. Serious adverse events were seen in 0.7% of patients on sulopenem with one drug-related serious adverse event due to transient angioedema and 0.2% of patients on ciprofloxacin with no drug-related serious adverse event.

While we believe these results support a positive safety and tolerability profile for sulopenem and there were no safety issues identified in the CRL received from the FDA in July 2021, in future trials there may be unforeseen serious adverse events or side

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effects that differ from those seen in our prior Phase 3 program, in Phase 1 normal healthy volunteers with oral sulopenem or the prior post-marketing experience with probenecid. There may also be unexpected adverse events associated with probenecid that have not been seen to date.

If unexpected adverse events occur in any of our clinical trials, we may need to abandon development of our product candidates, or limit development to lower doses or to certain uses or subpopulations in which the undesirable side effects or other unfavorable characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective. Many compounds that initially showed promise in clinical or earlier stage testing are later found to cause undesirable or unexpected side effects that prevent further development of the compound.

Undesirable side effects or other unexpected adverse events or properties of oral sulopenem, sulopenem or any of our other future product candidates could arise or become known either during clinical development or, if approved, after the approved product has been marketed. If such an event occurs during development, our clinical trials could be suspended or terminated and the FDA or comparable foreign regulatory authorities could order us to cease further development of, or could deny approval of, oral sulopenem, sulopenem or other product candidates. If such an event occurs after such product candidates are approved, a number of potentially significant negative consequences may result, including:

•regulatory authorities may withdraw the approval of such product;

•we may be required to recall a product or change the way such product is administered to patients;

•regulatory authorities may require additional warnings on the label or impose distribution or use restrictions;

•regulatory authorities may require one or more post-marketing studies;

•regulatory authorities may require the addition of a “black box” warning;

•we may be required to implement a Risk Evaluation and Mitigation Strategy (REMS), including the creation of a medication guide outlining the risks of such side effects for distribution to patients;

•we could be sued and held liable for harm caused to patients;

•our product may become less competitive; and

•our reputation may suffer.

Additionally, if the safety warnings in our product labels are not followed, adverse medical situations in patients may arise, resulting in negative publicity and potential lawsuits, even if our products worked as we described. Any of these events could prevent us from achieving or maintaining market acceptance of the affected product candidate, if approved, or could substantially increase commercialization costs and expenses, which could delay or prevent us from generating revenue from the sale of our products and harm our business and results of operations.

Even if a product candidate does obtain regulatory approval, it may never achieve the market acceptance by physicians, patients, hospitals, third-party payors and others in the medical community that is necessary for commercial success, and the market opportunity may be smaller than we estimate.

Even if we obtain FDA or other regulatory approvals and are able to launch oral sulopenem, sulopenem or any other product candidate commercially, the product candidate may not achieve market acceptance among physicians, patients, hospitals (including pharmacy directors) and third-party payors and, ultimately, may not be commercially successful. For example, physicians are often reluctant to switch their patients from existing therapies even when new and potentially more effective or convenient treatments enter the market. Moreover, many antibiotics currently exist for the pathogens underlying uUTI, cUTI and cIAI. While many of those pathogens are resistant to certain drugs in the market, the selection is broad, and individual physicians’ prescribing patterns vary widely and are affected by resistance rates in their geographies, whether their patients are at elevated risk, the ability of patients to afford branded drugs and concerns regarding generating resistance with specific classes of antibiotics.

Efforts to educate the medical community and third-party payors on the benefits of our product candidates may require significant resources and may not be successful. If oral sulopenem, sulopenem or any other product candidate that we develop does not achieve an adequate level of market acceptance, we may not generate significant product revenues and, therefore, we may not become profitable. Market acceptance of any product candidate for which we receive approval depends on a number of factors, including:

•the efficacy and safety of the product candidate as demonstrated in clinical trials as compared to alternative treatments;

•the potential and perceived advantages and disadvantages of the product candidates, including cost and clinical benefit relative to alternative treatments;

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•relative convenience and ease of administration;

•the clinical indications for which the product candidate is approved;

•the willingness of physicians to prescribe the product;

•the willingness of hospital pharmacy directors to purchase the product for their formularies;

•acceptance by physicians, patients, operators of hospitals and treatment facilities and parties responsible for coverage and reimbursement of the product;

•the availability of coverage and adequate reimbursement by third-party payors and government authorities;

•the effectiveness of our sales and marketing efforts or those of collaborators, where we choose not to commercialize directly ourselves;

•the strength of marketing and distribution support;

•limitations or warnings, including distribution or use restrictions, contained in the product’s approved labeling or an approved REMS;

•whether the product is designated under physician treatment guidelines as a first-line therapy or as a second- or third-line therapy for particular infections;

•the approval of other new products for the same indications;

•the timing of market introduction of the approved product as well as competitive products;

•adverse publicity about the product or favorable publicity about competitive products;

•the emergence of bacterial resistance to the product; and

•the rate at which resistance to other drugs in the target infections grows.

In addition, the potential market opportunity for oral sulopenem and sulopenem is difficult to estimate. Our estimates of the potential market opportunity are predicated on several key assumptions such as industry knowledge and publications, third-party research reports and other surveys. While we believe that our internal assumptions are reasonable, these assumptions involve the exercise of significant judgment on the part of our management, are inherently uncertain and the reasonableness of these assumptions has not been assessed by an independent source. If any of the assumptions prove to be inaccurate, then the actual market for oral sulopenem and/or sulopenem could be smaller than our estimates of the potential market opportunity. If the actual market for oral sulopenem and/or sulopenem is smaller than we expect, or if the product fails to achieve an adequate level of acceptance by physicians, health care payors, patients, hospitals and others in the medical community, our product revenue may be limited and it may be more difficult for us to achieve or maintain profitability.

We have a limited operating history and no history of commercializing pharmaceutical products, which may make it difficult to evaluate the prospects for our future viability.

We began operations in November 2015. Since our inception, we have devoted substantially all of our financial resources and efforts to organizing and staffing our company, business planning, raising capital, planning for potential commercialization, and research and development, including preclinical and clinical development, for our sulopenem program. While the members of our development team have successfully developed and registered other antibiotics in past roles at different companies, our company has limited experience and has not yet demonstrated an ability to successfully obtain marketing approval, manufacture a commercial scale product (or arrange for a third party to do so on our behalf), or conduct sales and marketing activities necessary for successful product commercialization. Consequently, predictions about our future success or viability may not be as accurate as they could be if we had a longer operating history or a history of successfully developing and commercializing pharmaceutical products. Assuming we obtain marketing approval for oral sulopenem or sulopenem, we will need to transition from a company with a research and development focus to a company capable of supporting commercial activities whether we choose to commercialize product candidates directly ourselves or seek to commercialize them through third-party collaboration arrangements. We may encounter unforeseen expenses, difficulties, complications and delays, and may not be successful in such a transition.

We currently have no commercial organization. If we are unable to establish and maintain sales, marketing and distribution capabilities or enter into sales, marketing and distribution agreements with third parties, we may not be successful in commercializing oral sulopenem, sulopenem or any other product candidate if such product candidate is approved.

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If we are unable to establish and maintain sales, marketing and distribution capabilities or enter into sales, marketing and distribution agreements with third parties, we may not be successful in commercializing oral sulopenem, sulopenem or any other product candidate if such product candidate is approved.

We are currently evaluating our commercialization strategy in the United States and other territories. We are focusing our initial commercial efforts on the United States market, which we believe represents the largest market opportunity for our sulopenem program. We currently do not have a sales, marketing or distribution infrastructure and we have no experience in the sales, marketing or distribution of pharmaceutical products. To achieve commercial success for any approved product, we must either build our marketing, sales, distribution, managerial and other non-technical capabilities, or make arrangements to outsource those functions to third parties. If oral sulopenem and/or sulopenem receive regulatory approval, we may build a commercial organization and recruit a targeted sales force with technical expertise, an internal marketing and health resource group, as well as a managed markets group focused on reimbursement activities with third-party payors and a specialty distribution team to ensure pharmacy-level stocking and, where we choose not to commercialize directly ourselves, we will seek to commercialize oral sulopenem and/or sulopenem through collaboration arrangements. We are not currently party to any such arrangements but engaged a potential commercial partner to provide pre-commercial activities and we commenced negotiations on a definitive agreement for commercialization services. Following receipt of the CRL in July 2021, in order to reduce operating expenses and conserve cash resources, we halted any remaining pre-commercial activities and paused negotiations on the definitive agreement for commercialization services. There is no assurance that we will seek or be able to reach a definitive agreement for commercialization services in the future.

The development of sales, marketing and distribution capabilities will require substantial resources, will be time-consuming and could delay any product launch. If the commercial launch of a product candidate for which we recruit a sales force and establish marketing and distribution capabilities is delayed or does not occur for any reason, we would have prematurely or unnecessarily incurred these commercialization costs. This may be costly, and our investment would be lost if we cannot retain or reposition our sales and marketing personnel. In addition, we may not be able to hire a sales force in the United States that is sufficient in size or has adequate expertise in the medical markets that we intend to target. If we are unable to establish a sales force and marketing and distribution capabilities, our operating results may be adversely affected. Any failure or delay in the development of our internal sales, marketing and distribution capabilities would adversely impact the commercialization of our product candidates.

Other factors that may inhibit our efforts to commercialize our products directly include:

•our inability to recruit, train and retain adequate numbers of effective sales and marketing personnel;

•the inability of a health resources group to obtain access to educate physicians regarding the attributes of our future products;

•lack of adequate number of physicians to use or prescribe our products;

•the lack of complementary products to be offered by sales personnel, which may put us at a competitive disadvantage relative to companies with more extensive product lines;

•costs and expenses associated with creating an independent sales and marketing organization;

•challenges in developing a commercialization strategy or launching new drug products using a traditional marketing model following a global health crisis or pandemic, like COVID-19; and

•our inability to reach a definitive agreement for commercialization services with respect to the potential commercialization of sulopenem in the United States or abroad, should we chose to outsource such services to a third party.

For those countries in which we choose not to commercialize directly ourselves, we intend to use collaborators that have direct sales forces and established distribution systems to assist with the commercialization of oral sulopenem, sulopenem and any other product candidate. As a result of entering into arrangements with third parties to perform sales, marketing and distribution services, our product revenues or the profitability of these product revenues to us would likely be lower than if we were to directly market and sell products in those markets.

Furthermore, we may be unsuccessful in entering into the necessary arrangements with third parties, or in obtaining all necessary approvals that may be required to enter into such arrangements, or may be unable to do so on terms that are favorable to us. In addition, we likely would have little control over such third parties, and any of them might fail to devote the necessary resources and attention to sell and market our products effectively.

If we do not establish sales and marketing capabilities successfully, either on our own or in collaboration with third parties, we will not be successful in commercializing our product candidates.

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We face substantial competition from other pharmaceutical and biotechnology companies and our business may suffer if we fail to compete effectively.

The development and commercialization of new drug products is highly competitive. We face competition from major pharmaceutical companies, specialty pharmaceutical companies and biotechnology companies worldwide with respect to oral sulopenem, sulopenem and other product candidates that we may seek to develop and commercialize in the future. There are a number of pharmaceutical and biotechnology companies that currently market and sell products or are pursuing the development of product candidates for the treatment of multi-drug resistant infections. Potential competitors also include academic institutions, government agencies and other public and private research organizations. Our competitors may succeed in developing, acquiring or licensing technologies and drug products that are more effective or less costly than oral sulopenem, sulopenem or any other product candidates that we may develop, which could render our product candidates obsolete and noncompetitive.

There are a variety of available oral therapies marketed for the treatment of multi-drug resistant infections that we would expect would compete with oral sulopenem and sulopenem, such as levofloxacin, ciprofloxacin, nitrofurantoin, fosfomycin, amoxicillin-clavulanate, cephalexin and trimethoprim-sulfamethoxazole. Many of the available therapies are well established and widely accepted by physicians, patients and third-party payors. Insurers and other third-party payors may also encourage the use of generic products, for example in the fluoroquinolone class. If oral sulopenem or sulopenem is approved, the pricing may be at a significant premium over other competitive products that are generic. This may make it difficult for oral sulopenem or sulopenem to compete with these products.

There are also a few oral product candidates in clinical development by third parties that are intended to treat uUTIs. Late-stage product candidates include gepotidacin from GlaxoSmithKline and pivmecillinam from Utility Therapeutics Limited. If our competitors obtain marketing approval from the FDA or comparable foreign regulatory authorities for their product candidates more rapidly than us, it could result in our competitors establishing a strong market position before we are able to enter the market.

There are several IV-administered products marketed for the treatment of infections resistant to first-line therapy for gram-negative infections, including Avycaz from AbbVie Inc and Pfizer, Vabomere from Melinta Therapeutics, Inc., Zerbaxa from Merck & Co., Zemdri from Cipla, Xerava from La Jolla Pharmaceutical Company, Recarbrio from Merck & Co, and Fetroja from Shionogi & Co., Ltd.

Many of our competitors have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals and marketing approved products than we do. Mergers and acquisitions in the pharmaceutical and biotechnology industries may result in even more resources being concentrated among a smaller number of our competitors. Smaller and other early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. These third parties compete with us in recruiting and retaining qualified scientific, management and sales and marketing personnel, establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring technologies complementary to, or necessary for, our programs.

In July 2012, the Food and Drug Administration Safety and Innovation Act was passed, which included the Generating Antibiotics Incentives Now Act (the GAIN Act). The GAIN Act is intended to provide incentives for the development of new, qualified infectious disease products (QIDP). One such incentive is that, once a product receives QIDP designation and completes the necessary clinical trials and is approved by the FDA, it will be given an additional five years of regulatory exclusivity regardless of whether it is protected by a patent, provided that it is already eligible for another type of regulatory exclusivity. The FDA has designated sulopenem and oral sulopenem as QIDPs for the indications of uUTI, cUTI, cIAI, community-acquired bacterial pneumonia, acute bacterial prostatitis, gonococcal urethritis, and pelvic inflammatory disease. Fast track designation for these seven indications in both the oral and intravenous formulations has also been granted. In December 2016, the Cures Act was passed, providing additional support for the development of new infectious disease products. These incentives may result in more competition in the market for new antibiotics, and may cause pharmaceutical and biotechnology companies with more resources than we have to shift their efforts towards the development of product candidates that could be competitive with oral sulopenem, sulopenem and our other product candidates.

Even if we are able to commercialize oral sulopenem, sulopenem or any other product candidate, the product may become subject to unfavorable pricing regulations, or third-party payor coverage and reimbursement policies that could harm our business.

Marketing approvals, pricing, coverage and reimbursement for new drug products vary widely from country to country. Some countries require approval of the sale price of a drug before it can be marketed. In many countries, the pricing review period begins after marketing or product licensing approval is granted. In some foreign markets, prescription pharmaceutical pricing remains subject to continuing governmental control even after initial approval is granted. As a result, we might obtain marketing approval for a product in a particular country, but then be subject to price regulations that delay our commercial launch of the product, possibly for lengthy time periods, which may negatively affect the revenues that we are able to generate from the sale of the product in that country. Adverse pricing limitations may hinder our ability to recoup our investment in one or more product candidates, even if our product candidates obtain marketing approval.

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The commercial success of oral sulopenem and any future product candidates, if approved, will depend substantially, both in the United States and outside the United States, on the extent to which coverage and adequate reimbursement for the product and related treatments are available from government health programs, private health insurers and other third-party payors. If coverage is not available, or reimbursement is limited, we may not be able to successfully commercialize our product candidates. Even if coverage is provided, the approved reimbursement amount may not be high enough to allow us to establish or maintain pricing sufficient to realize a sufficient return on our investments. Government authorities and third-party payors, such as health insurers and managed care organizations, publish formularies that identify the medications they will cover and the related payment levels. The healthcare industry is focused on cost containment, both in the United States and elsewhere. Government authorities and third-party payors have attempted to control costs by limiting coverage and the amount of reimbursement for particular medications, which could affect our ability to sell our product candidates profitably.

In the United States, sales of our product candidates will depend, in part, on the availability and extent of coverage and reimbursement by third-party payors, such as government health programs, including Medicare and Medicaid, commercial insurance and managed healthcare organizations. There is no uniform coverage and reimbursement policy among third-party payors; however, private third-party payors often follow Medicare coverage policy and payment limitations in setting their own reimbursement rates. Obtaining coverage and reimbursement approval for a product candidate from third-party payors is a time-consuming and costly process that may require the provision of supporting scientific, clinical and cost effectiveness data for the use of such product candidate to the third-party payor. There may be significant delays in obtaining such coverage and reimbursement for newly approved products, and coverage may be more limited than the purposes for which the product candidate is approved by the FDA. Moreover, eligibility for coverage and reimbursement does not imply that a product candidate will be paid for in all cases or at a rate that covers operating costs, including research, development, intellectual property, manufacture, sales and distribution expenses. Reimbursement rates may vary according to the use of the product candidate and the clinical setting in which it is used, may be based on reimbursement levels already set for lower cost products and may be incorporated into existing payments for other services. It is difficult to predict what third-party payors will decide with respect to coverage and reimbursement for our product candidates.

We currently expect that sulopenem IV, if approved, will be administered in a hospital setting, and oral sulopenem, if approved, will be used in a community setting and possibly be administered in a hospital inpatient setting as well. In the United States, third-party payors generally reimburse hospitals a single bundled payment established on a prospective basis intended to cover all items and services provided to the patient during a single hospitalization. Hospitals bill third-party payors for all or a portion of the fees associated with the patient’s hospitalization and bill patients for any deductibles or co-payments. Because there is typically no separate reimbursement for drugs administered in a hospital inpatient setting, some of our target customers may be unwilling to adopt our product candidates in light of the additional associated cost. If we are forced to lower the price we charge for our product candidates, if approved, our gross margins may decrease, which would adversely affect our ability to invest in and grow our business. Centers for Medicare and Medicaid Services (CMS) recently revised its reimbursement system for certain antibiotics in order to address challenges associated with antimicrobial resistance. Based on the final rule published on August 2, 2019, CMS is finalizing an alternative new technology add-on payment pathway (NTAP) for certain breakthrough devices, and under this policy, a QIDP product will be considered new and will not need to demonstrate that it meets the substantial clinical improvement criterion. Instead it will only need to meet the cost criterion. CMS has also increased the NTAP percentage to 75 percent for an antimicrobial designated by the FDA as a QIDP. The potential impact of this rule on sulopenem has not yet been assessed.

On April 18, 2022, CMS released the Fiscal Year (FY) 2023 Inpatient Prospective Payment System (IPPS) proposed rule. Within each IPPS proposed rule, CMS assesses technologies that have been submitted for potential NTAP status and reconsiders the eligibility for technologies already so designated. In connection with this proposed rule, CMS assessed 13 technologies that were submitted for FY 2023 NTAP consideration through alternative application pathways. These pathways streamline the NTAP application process for (1) devices with FDA breakthrough designation, (2) drugs designated as qualified infectious disease products, and (3) technologies approved through the FDA’s Limited Population Pathway for Antibacterial and Antifungal Drugs. CMS has once again proposed to approve these 13 technologies applying through the alternative pathway depending on FDA approval or clearance.

An inability to promptly obtain coverage and adequate payment rates from third-party payors for any approved product candidates that we develop could have a material adverse effect on our operating results, our ability to raise capital needed to commercialize products and our overall financial condition.

We cannot predict whether bacteria may develop resistance to oral sulopenem or sulopenem, which could affect their revenue potential.

We are developing oral sulopenem and sulopenem to treat drug-resistant bacterial infections. The bacteria responsible for these infections evolve quickly and readily transfer their resistance mechanisms within and between species. We cannot predict whether or when bacterial resistance to oral sulopenem and sulopenem may develop.

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As with some commercially available carbapenems, oral sulopenem and sulopenem are not active against organisms expressing a resistance mechanism mediated by enzymes known as carbapenemases. Although occurrence of this resistance mechanism is currently uncommon, we cannot predict whether carbapenemase-mediated resistance will become widespread in regions where we intend to market sulopenem if it is approved. The use of carbapenems or penems in areas with drug-resistant infections or in countries with poor public health infrastructures, or the potentially extensive use of oral sulopenem or sulopenem outside of controlled hospital settings or in the community, could contribute to the rise of resistance. In addition, prescribers may be less likely to prescribe oral sulopenem and sulopenem if they are concerned about contributing to the rise of antibiotic resistance. If resistance to oral sulopenem or sulopenem becomes prevalent, or concerns about such resistance are strong, our ability to generate revenue from oral sulopenem and sulopenem could suffer.

We may be subject to costly product liability claims related to our clinical trials and product candidates and, if we are unable to obtain adequate insurance or are required to pay for liabilities resulting from a claim excluded from, or beyond the limits of our insurance coverage, a material liability claim could adversely affect our financial condition.

Because we conduct clinical trials with human patients, we face the risk that the use of our product candidates may result in adverse side effects to patients in our clinical trials. We face even greater risks upon any commercialization of our product candidates. Although we have product liability insurance, which covers our clinical trials for up to $10.0 million, our insurance may be insufficient to reimburse us for any expenses or losses we may suffer. We will need to increase our insurance coverage if and when we receive marketing approval for and begin selling oral sulopenem, sulopenem or any other product candidate. We do not know whether we will be able to continue to obtain product liability coverage and obtain expanded coverage if we require it, on acceptable terms, if at all.

We may not have sufficient resources to pay for any liabilities resulting from a claim excluded from, or beyond the limits of, our insurance coverage. Where we have provided indemnities in favor of third parties under our agreements with them, there is also a risk that these third parties could incur a liability and bring a claim under such indemnities. An individual may bring a product liability claim against us alleging that one of our product candidates or products causes, or is claimed to have caused, an injury or is found to be unsuitable for consumer use. Any product liability claim brought against us, with or without merit, could result in:

•withdrawal of clinical trial volunteers, investigators, patients or trial sites;

•the inability to commercialize our product candidates;

•decreased demand for our product candidates;

•regulatory investigations that could require costly recalls or product modifications;

•loss of revenue;

•substantial costs of litigation;

•liabilities that substantially exceed our product liability insurance, which we would then be required to pay ourselves;

•an increase in our product liability insurance rates or the inability to maintain insurance coverage in the future on acceptable terms, if at all;

•the diversion of management’s attention from our business; and

•damage to our reputation and the reputation of our products.

Our operations, including our use of hazardous materials, chemicals, bacteria and viruses, require us to comply with regulatory requirements and expose us to significant potential liabilities.

Our operations involve the use of hazardous materials, including chemicals, and may produce dangerous waste products. Accordingly, we, along with the third parties that conduct clinical trials and manufacture our products and product candidates on our behalf, are subject to federal, state, local and foreign laws and regulations that govern the use, manufacture, distribution, storage, handling, exposure, disposal and recordkeeping with respect to these materials. We are also subject to a variety of environmental and occupational health and safety laws. Compliance with current or future laws and regulations can require significant costs and we could be subject to substantial fines and penalties in the event of non-compliance. In addition, the risk of contamination or injury from these materials cannot be completely eliminated. In such event, we could be held liable for substantial civil damages or costs associated with the cleanup of hazardous materials.

If we experience a significant disruption in our information technology systems or breaches of data security, our business could be adversely affected.

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We rely on information technology systems to keep financial records, capture laboratory data, maintain clinical trial data and corporate records, communicate with staff and external parties and operate other critical functions. Our information technology systems are potentially vulnerable to disruption due to breakdown, malicious intrusion and computer viruses or other disruptive events including, but not limited to, natural disaster. If we were to experience a prolonged system disruption in our information technology systems or those of certain of our vendors, it could delay or negatively impact the development and commercialization of our sulopenem program and any future product candidates or technology, which could adversely impact our business. Although we maintain offsite back-ups of our data, if operations at our facilities were disrupted, it may cause a material disruption in our business if we are not capable of restoring function on an acceptable timeframe. In addition, our information technology systems are potentially vulnerable to data security breaches, whether by employees or others, which may expose sensitive data to unauthorized persons. Such data security breaches could lead to the loss of trade secrets or other intellectual property, or could lead to the public exposure of personal information (including sensitive personal information) of our employees and others, any of which could have a material adverse effect on our business, financial condition and results of operations. Moreover, a security breach or privacy violation that leads to disclosure or modification of, personally identifiable information, could harm our reputation, compel us to comply with applicable European, and United States federal and/or state, breach notification laws, subject us to mandatory corrective action, require us to verify the correctness of database contents and otherwise subject us to litigation and liability under laws and regulations that protect personal data, resulting in increased costs or loss of revenue. In addition, a data security breach could result in loss of clinical trial data or damage to the integrity of that data. If we are unable to prevent such security breaches or privacy violations or implement satisfactory remedial measures, our operations could be disrupted, and we may suffer reputational damage, financial loss and other negative consequences because of lost or misappropriated information. In addition, these breaches and other inappropriate access can be difficult to detect, and any delay in identifying them may lead to increased harm of the type described above.

Risks Related to Our Dependence on Third Parties

If we fail to comply with our obligations in our agreement with Pfizer, we could lose such rights that are important to our business.

We rely heavily on the Pfizer License pursuant to which we exclusively in-license certain patent rights and know-how related to sulopenem etzadroxil and certain know-how related to the IV formulation of sulopenem. The Pfizer License imposes diligence, development and commercialization timelines, milestone payments, royalties, insurance and other obligations on us, and we may enter into additional agreements, including license agreements, with other parties in the future which impose similar obligations.

The Pfizer License gives us exclusive worldwide rights to develop, manufacture, and commercialize sulopenem etzadroxil and sulopenem, or any other prodrug of sulopenem previously identified by Pfizer as well as the right to use relevant information and regulatory documentation developed by Pfizer to support any regulatory filing worldwide. In exchange for those rights, we are obligated to satisfy diligence requirements, including using commercially reasonable efforts to develop, obtain regulatory approval for and commercialize sulopenem etzadroxil and sulopenem by implementing a specified development plan and providing an update on progress on an annual basis. Under the Pfizer License, we paid Pfizer a one-time non-refundable upfront fee of $5.0 million, clinical milestone payments totaling $15.0 million, upon first patient dosing of oral sulopenem and sulopenem in a Phase 3 clinical trial, and are obligated to pay Pfizer milestone payments upon the achievement of other specified regulatory and sales milestones, as well as royalties ranging from a single-digit to mid-teens percentage based on the amount of marginal net sales of each licensed product. Pfizer also received 381,922 of our Series A preferred shares (which converted to 25,461 ordinary shares in connection with our initial public offering (IPO)) as additional payment for the licensed rights.

If we fail to comply with our obligations to Pfizer under the Pfizer License, Pfizer may have the right to terminate the Pfizer License, in which event we would not be able to develop, obtain regulatory approval for, manufacture or market any product candidate that is covered by the Pfizer License, including sulopenem etzadroxil and sulopenem, which would materially harm our business, financial condition, results of operations and growth prospects. Any termination of the Pfizer License or reduction or elimination of our rights thereunder may result in our having to negotiate new or reinstated agreements with less favorable terms. Any termination of the Pfizer License would cause us to lose our rights to important intellectual property or technology.

We expect to depend on collaborations with third parties for the development and commercialization of oral sulopenem and/or sulopenem in certain territories. Our prospects with respect to those product candidates will depend in part on the success of those collaborations.

Although we are focusing our initial commercial efforts on the United States market, which we believe represents the largest market opportunity for our sulopenem program, we are also evaluating our commercialization strategy both within and outside the United States. We currently do not have a sales, marketing or distribution infrastructure and we have no experience in the sales, marketing or distribution of pharmaceutical products. To achieve commercial success for any approved product, we must either build our marketing, sales, distribution, managerial and other non-technical capabilities, or make arrangements to outsource those functions to third parties. For those countries in which we choose not to commercialize directly ourselves, we intend to seek to commercialize oral sulopenem and/or sulopenem through collaboration arrangements. In addition, we may seek third-party collaborators for

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development and commercialization of other product candidates in the United States and other territories. Our likely collaborators for any marketing, distribution, development, licensing or broader collaboration arrangements include service providers to the pharmaceutical industry, large and mid-size pharmaceutical companies, regional and national pharmaceutical companies and biotechnology companies. We are not currently party to any such arrangements but engaged a potential commercial partner to provide pre-commercial activities and we commenced negotiations on a definitive agreement for commercialization services. Following receipt of the CRL in July 2021, in order to reduce operating expenses and conserve cash resources, we halted any remaining pre-commercial activities and paused negotiations on a definitive agreement for commercialization services. There is no assurance that we will seek or be able to reach a definitive agreement for commercialization services in the future.

We may derive revenue from research and development fees, license fees, milestone payments and royalties under any collaborative arrangement into which we enter. Our ability to generate revenue from these arrangements will depend on our collaborators’ abilities to successfully perform the functions assigned to them in these arrangements. In addition, our collaborators may have the right to abandon research or development projects and terminate applicable agreements, including funding obligations, prior to or upon the expiration of the agreed upon terms. As a result, we can expect to relinquish some or all of the control over the future success of a product candidate that we license to a third party.

We face significant competition in seeking and obtaining appropriate collaborators. Collaborations involving our product candidates may pose a number of risks, including the following:

•collaborators have significant discretion in determining the efforts and resources that they will apply to these collaborations;

•collaborators may not perform their obligations as expected;

•collaborators may not pursue development and commercialization of our product candidates or may elect not to continue or renew development or commercialization programs based on clinical trial results, changes in the collaborators’ strategic focus or available funding, or external factors, such as an acquisition, that divert resources or create competing priorities;

•collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for clinical testing;

•product candidates discovered in collaboration with us may be viewed by our collaborators as competitive with their own product candidates or products, which may cause collaborators to cease to devote resources to the commercialization of our product candidates;

•a collaborator with marketing and distribution rights to one or more products may not commit sufficient resources to the marketing and distribution of such product or products;

•disagreements with collaborators, including disagreements over proprietary rights, contract interpretation or the preferred course of development, might cause delays or termination of the research, development or commercialization of product candidates, might lead to additional responsibilities for us with respect to product candidates, or might result in litigation or arbitration, any of which would be time consuming and expensive;

•collaborators may not properly maintain, defend or enforce our intellectual property rights or may use our proprietary information in such a way as to invite litigation that could jeopardize or invalidate our intellectual property or proprietary information or expose us to potential litigation;

•collaborators may infringe, misappropriate or otherwise violate the intellectual property rights of third parties, which may expose us to litigation and potential liability; and

•collaborations may be terminated and, if terminated, may result in a need for additional capital to pursue further development or commercialization of the applicable product candidates.

Collaboration agreements may not lead to development or commercialization of product candidates in the most efficient manner or at all. If a collaborator of ours is involved in a business combination, it could decide to delay, diminish or terminate the development or commercialization of any product candidate licensed to it by us.

If we are unable to reach agreements with suitable collaborators on a timely basis, on acceptable terms, or at all, we may have to curtail the development of a product candidate, reduce or delay its development program or one or more of our other development programs, delay its potential commercialization or reduce the scope of any sales or marketing activities, or increase our expenditures and undertake development or commercialization activities at our own expense. If we elect to fund and undertake development or commercialization activities on our own, we will need to obtain additional expertise and additional capital, which may not be available to us on acceptable terms or at all. If we fail to enter into collaborations and do not have sufficient funds or expertise to undertake the

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necessary development and commercialization activities, we may not be able to further develop our product candidates or bring them to market or continue to develop our product platform.

We may rely on third parties to perform many essential services for any products that we commercialize, including services related to warehousing and inventory control, distribution, government price reporting, customer service, accounts receivable management, cash collection, and pharmacovigilance and adverse event reporting. If these third parties fail to perform as expected or to comply with legal and regulatory requirements, our ability to commercialize our product candidates will be significantly impacted and we may be subject to regulatory sanctions.

We may retain third-party service providers to perform a variety of functions related to the sale and distribution of our product candidates, key aspects of which will be out of our direct control. These service providers may provide key services related to warehousing and inventory control, distribution, customer service, accounts receivable management, and cash collection. If we retain a service provider, we would substantially rely on it as well as other third-party providers that perform services for us, including entrusting our inventories of products to their care and handling. If these third-party service providers fail to comply with applicable laws and regulations, fail to meet expected deadlines, or otherwise do not carry out their contractual duties to us, or encounter physical or natural damage at their facilities, our ability to deliver product to meet commercial demand would be significantly impaired and we may be subject to regulatory enforcement action. In addition, we may engage third parties to perform various other services for us relating to pharmacovigilance and adverse event reporting, safety database management, fulfillment of requests for medical information regarding our product candidates and related services. If the quality or accuracy of the data maintained by these service providers is insufficient, or these third parties otherwise fail to comply with regulatory requirements, we could be subject to regulatory sanctions. Additionally, we may contract with a third party to calculate and report pricing information mandated by various government programs. If a third party fails to timely report or adjust prices as required, or errors in calculating government pricing information from transactional data in our financial records, it could impact our discount and rebate liability, and potentially subject us to regulatory sanctions or False Claims Act lawsuits.

We rely on third parties to conduct our preclinical studies and our clinical trials. If these third parties do not successfully carry out their contractual duties or meet expected deadlines, we may be unable to obtain regulatory approval for or commercialize any of our product candidates. If they do not perform satisfactorily, our business may be materially harmed.

We do not independently conduct non-clinical studies that comply with good laboratory practice (GLP) requirements. We also do not have the ability to independently conduct clinical trials of any of our product candidates. We rely on third parties, such as CROs, clinical data management organizations, medical institutions, and clinical investigators to conduct our clinical trials of oral sulopenem and sulopenem and expect to rely on these third parties to conduct clinical trials of any potential product candidates. Any of these third parties may terminate their engagements with us at any time. If we need to enter into alternative arrangements, it would delay our product development activities.

Our reliance on these third parties for clinical development activities limits our control over these activities but we remain responsible for ensuring that each of our studies is conducted in accordance with the applicable protocol, legal, regulatory and scientific standards. For example, notwithstanding the obligations of a CRO for a clinical trial of one of our product candidates, we remain responsible for ensuring that each of our clinical trials is conducted in accordance with the general investigational plan and protocols for the clinical trial. While we will have agreements governing their activities, we control only certain aspects of their activities and have limited influence over their actual performance. The third parties with whom we contract for execution of our GLP studies and our clinical trials play a significant role in the conduct of these studies and clinical trials and the subsequent collection and analysis of data.

Although we rely on these third parties to conduct our GLP-compliant non-clinical studies and clinical trials, we remain responsible for ensuring that each of our non-clinical studies and clinical trials are conducted in accordance with applicable laws and regulations, and our reliance on the CROs does not relieve us of our regulatory responsibilities. The FDA and regulatory authorities in other jurisdictions also require us to comply with standards, commonly referred to as good clinical practices (GCPs), for conducting, monitoring, recording and reporting the results of clinical trials to assure that data and reported results are accurate and that the trial subjects are adequately informed of the potential risks of participating in clinical trials. The FDA enforces these GCPs through periodic inspections of trial sponsors, principal investigators, clinical trial sites and institutional review boards. If we or our third-party contractors fail to comply with applicable GCPs, the clinical data generated in our clinical trials may be deemed unreliable and the FDA may require us to perform additional clinical trials before approving our product candidates, which would delay the regulatory approval process. We cannot assure our shareholders that, upon inspection, the FDA will determine that any of our clinical trials comply with GCPs. We are also required to register clinical trials and post the results of completed clinical trials on a government-sponsored database, ClinicalTrials.gov, within certain timeframes. Failure to do so can result in fines, adverse publicity and civil and criminal sanctions.

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Furthermore, the third parties conducting clinical trials on our behalf are not our employees, and except for remedies available to us under our agreements with such contractors, we cannot control whether or not they devote sufficient time and resources to our development programs. These contractors may also have relationships with other commercial entities, including our competitors, for whom they may also be conducting clinical trials or other drug development activities, which could impede their ability to devote appropriate time to our clinical programs. If these third parties do not successfully carry out their contractual duties, meet expected deadlines or conduct our clinical trials in accordance with regulatory requirements or our stated protocols, we may not be able to obtain, or may be delayed in obtaining, marketing approvals for our product candidates. If that occurs, we may not be able to, or may be delayed in our efforts to, successfully commercialize our product candidates. In such an event, our financial results and the commercial prospects for oral sulopenem, sulopenem or other product candidates could be harmed, our costs could increase and our ability to generate revenue could be delayed, impaired or foreclosed.

We also rely on other third parties to store and distribute drug supplies for our clinical trials. Any performance failure on the part of our distributors could delay clinical development or marketing approval of our product candidates or commercialization of any resulting products, producing additional losses and depriving us of potential product revenue.

We contract with third parties for the manufacture of preclinical and clinical supplies of oral sulopenem and sulopenem and expect to continue to do so in connection with any future clinical trials and future commercialization of our product candidates and potential product candidates. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or such quantities at an acceptable cost, which could delay, prevent or impair our development or commercialization efforts.

We do not have the internal infrastructure or capability to manufacture oral sulopenem and sulopenem for use in the conduct of our preclinical research or clinical trials or for commercialization. We rely on third-party contract manufacturers to manufacture supplies of oral sulopenem and sulopenem, and we expect to rely on third-party contract manufacturers to manufacture commercial quantities of any product candidate that we commercialize following approval for marketing by applicable regulatory authorities, if any. Reliance on third-party manufacturers entails risks, including:

•manufacturing delays if our third-party manufacturers give greater priority to the supply of other products over our product candidates or otherwise do not satisfactorily perform according to the terms of their agreement with us;

•the possible termination or nonrenewal of the agreement by the third party at a time that is costly or inconvenient for us;

•the possible breach of the manufacturing agreement by the third party;

•the failure of the third-party manufacturer to comply with applicable regulatory requirements; and

•the possible misappropriation of our proprietary information, including our trade secrets and know-how.

We currently rely on a small number of third-party contract manufacturers for all of our required raw materials, drug substance and finished product for our preclinical research and clinical trials. We do not have long-term agreements with any of these third parties. We also do not have any current contractual relationships for the manufacture of commercial supplies of any of our product candidates. If any of our existing manufacturers should become unavailable to us for any reason, we may incur delays in identifying or qualifying replacements.

We will enter into agreements with third-party contract manufacturers for the commercial production of oral sulopenem and/or sulopenem. This process is difficult and time consuming and we may face competition for access to manufacturing facilities as there are a limited number of contract manufacturers operating under current Good Manufacturing Practices, or cGMPs, that are capable of manufacturing our product candidates. Consequently, we may not be able to reach agreement with third-party manufacturers on satisfactory terms, which could delay our commercialization.

Third-party manufacturers are required to comply with cGMPs and similar regulatory requirements outside the United States. Facilities used by our third-party manufacturers must be approved by the FDA after we submit an NDA(s) and before potential approval of the product candidate. Similar regulations apply to manufacturers of our product candidates for use or sale in countries outside of the United States. We have no direct control over the ability of our third-party manufacturers to maintain adequate quality control, quality assurance and qualified personnel, and are completely dependent on our third-party manufacturers for compliance with the applicable regulatory requirements for the manufacture of our product candidates. If our manufacturers cannot successfully manufacture material that conforms to the strict regulatory requirements of the FDA and any applicable regulatory authority, they will not be able to secure the applicable approval for their manufacturing facilities. If these facilities are not approved for commercial manufacture, we may need to find alternative manufacturing facilities, which could result in delays in obtaining approval for the applicable product candidate. In addition, our manufacturers are subject to ongoing periodic unannounced inspections by the FDA and

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corresponding state and foreign agencies for compliance with cGMPs and similar regulatory requirements. Failure by any of our manufacturers to comply with applicable cGMPs or other regulatory requirements could result in sanctions being imposed on us, including fines, injunctions, civil penalties, delays, suspensions or withdrawals of approvals, operating restrictions, interruptions in supply and criminal prosecutions, any of which could significantly and adversely affect supplies of our product candidates and have a material adverse effect on our business, financial condition and results of operations.

We and our third-party suppliers also continue to refine and improve the manufacturing process, certain aspects of which are complex and unique, and we may encounter difficulties with new or existing processes, particularly as we seek to significantly increase our capacity to commercialize oral sulopenem and/or sulopenem. Our reliance on contract manufacturers also exposes us to the possibility that they, or third parties with access to their facilities, will have access to and may appropriate our trade secrets or other proprietary information.

As drug candidates are developed through non-clinical studies to late-stage clinical trials towards approval and commercialization, it is common that various aspects of the development program, such as manufacturing methods, methods of making drug formulations, and drug formulations, are altered along the way in an effort to optimize processes and results. Such changes carry the risk that they will not achieve these intended objectives. Any of these changes could cause our drug candidates to perform differently and affect the results of clinical trials or other future clinical trials conducted with the altered materials. Such changes may also require additional testing, FDA notification or FDA approval. This could delay completion of clinical trials, require us to conduct bridging clinical trials or the repetition of one or more clinical trials, increase clinical trial costs, delay approval of our drug candidates and jeopardize our ability to commence sales and generate revenue.

While no issues with regard to third-party manufacturers or the manufacturing process were identified in the CRL received from the FDA in July 2021, there can be no assurance that issues will not be identified in the future or that our third-party manufacturers will continue to maintain adequate quality control, quality assurance and qualified personnel and/or will continue to comply with the applicable regulatory requirements for the manufacture of our product candidates.

Our current and anticipated future dependence upon others for the manufacture of oral sulopenem and sulopenem and any future product candidates may adversely affect our future profit margins and our ability to commercialize any products for which we receive marketing approval on a timely and competitive basis.

Risks Related to Our Intellectual Property

We rely heavily on the Pfizer License for the patent rights and know-how required to develop and commercialize oral sulopenem and the know-how required to develop the IV formulation of sulopenem.

We rely heavily on the Pfizer License for intellectual property rights that are important or necessary for the development of oral sulopenem and sulopenem. We do not own or license any patent rights that cover the IV formulation of sulopenem. In addition, all patents directed to the compound sulopenem expired prior to us entering into the Pfizer License. Licenses to additional third-party intellectual property, technology and materials that may be required for the development and commercialization of our sulopenem program or any other product candidates or technology may not be available at all or on commercially reasonable terms. In that event, we may be required to expend significant time and resources to redesign our sulopenem program and any other product candidates or technology we may obtain in the future or to develop or license replacement technology, all of which may not be feasible on a technical or commercial basis. If we are unable to do so, we may be unable to develop or commercialize oral sulopenem or sulopenem or other future product candidates or technologies, which could materially harm our business, financial condition, results of operations and growth prospects.

Under the Pfizer License, and we expect under certain of our future license agreements, we are responsible for prosecution and maintenance of the licensed patents and for bringing any actions against any third party for infringing on such patents. In addition, the Pfizer License requires, and we expect certain of our future license agreements would also require, us to meet certain development thresholds to maintain the license, including establishing a set timeline for developing and commercializing products. In addition, such license agreements are complex, and certain provisions in such agreements may be susceptible to multiple interpretations. The resolution of any contract interpretation disagreement that may arise could narrow what we believe to be the scope of our rights to the relevant intellectual property or technology, or increase what we believe to be our financial or other obligations under the relevant agreement, either of which could have a material adverse effect on our business, financial condition, results of operations and growth prospects. Disputes may arise regarding intellectual property subject to the Pfizer License or any of our future license agreements, including:

•the scope of rights granted under the license agreement and other interpretation-related issues;

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•the extent to which our technology and processes infringe, misappropriate or otherwise violate any intellectual property of the licensor that is not subject to the licensing agreement;

•the sublicensing of patent and other rights under the license agreement;

•our diligence obligations under the license agreement and what activities satisfy those diligence obligations;

•the inventorship and ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our licensors and us and our partners; and

•the priority of invention of patented technology.

In spite of our best efforts, Pfizer and any potential future licensors might conclude that we have materially breached our license agreements and might therefore terminate the relevant license agreements, thereby removing our ability to develop and commercialize products and technology covered by such license agreements. If any of our inbound license agreements are terminated, or if the underlying patents fail to provide the intended exclusivity, competitors would have the freedom to seek regulatory approval of, and to market, products identical to ours. This could have a material adverse effect on our competitive position, business, financial condition, results of operations and growth prospects.

If we are unable to obtain and maintain patent protection or other intellectual property rights for oral sulopenem or our other technology and product candidates, or if the scope of the patent protection or intellectual property rights we obtain is not sufficiently broad, we may not be able to successfully develop or commercialize oral sulopenem or any other product candidates or technology or otherwise compete effectively in our markets.

We rely upon a combination of patents, trademarks, trade secret protection, confidentiality agreements and other proprietary rights to protect the intellectual property related to our development programs and product candidates. Our success depends, in part, on obtaining and maintaining patent protection and successfully enforcing these patents and defending them against third-party challenges in the United States and other countries. If we or our licensors are unable to obtain or maintain patent protection with respect to oral sulopenem or any other product candidates or technology we develop, our business, financial condition, results of operations and growth prospects could be materially harmed.

We have sought to protect our proprietary position by in-licensing patents in the United States and abroad related to oral sulopenem. We own two U.S. patents, with one patent directed to the composition of the bilayer tablet of oral sulopenem and its related uses, and the other directed to the method of use of oral sulopenem in treating multiple diseases, including uUTIs. We also own three pending U.S. patent applications, and 27 pending foreign patent applications, which collectively cover uses of sulopenem and probenecid and bilayer tablets of sulopenem etzadroxil and probenecid. The patent prosecution process is expensive and time-consuming, and we and our licensors may not be able to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner or in all jurisdictions. It is also possible that we will fail to identify patentable aspects of our research and development output before it is too late to obtain patent protection. Moreover, although we control prosecution of the patents we have licensed from Pfizer related to our sulopenem program, we may not always have the right to control the preparation, filing and prosecution of patent applications, or to maintain, enforce or defend the patents, covering technology that we may license from third parties. Therefore, these patents and patent applications may not be prosecuted, maintained, enforced or defended in a manner consistent with the best interests of our business.

If any patent applications we own or may own or in-license in the future with respect to our development programs or product candidates fail to issue, if their breadth or strength of protection is threatened or if they fail to provide meaningful exclusivity for our current and future product candidates, it could dissuade companies from collaborating with us to develop product candidates and threaten our ability to commercialize products. Any such outcome could materially harm our competitive position, business, financial condition, results of operations and growth prospects.

The patent position of pharmaceutical companies generally is highly uncertain, involves complex legal and factual questions and has in recent years been the subject of much litigation. In addition, the laws of countries outside the United States may not protect our rights to the same extent as the laws of the United States. For example, European Union (EU) patent law restricts the patentability of methods of treatment of the human body more than U.S. law does. In addition, publications of discoveries in scientific literature often lag behind the actual discoveries, patent applications in the United States and other jurisdictions remain confidential for a period after filing, and some remain so until issued. Therefore, we cannot know with certainty whether we were the first to make the inventions claimed in the patents or pending patent applications we currently own, license or may own or license in the future, or that we were the first to file for patent protection of such inventions. As a result, the issuance, scope, validity, enforceability and commercial value of our patent rights are highly uncertain. There is no assurance that all potentially relevant prior art relating to our patent rights has been found, and such prior art could potentially invalidate one or more of the patents we currently license or may own or license in the future or prevent a patent from issuing from one or more pending patent applications we own or may own or license in the future. There is also no assurance that prior art of which we are aware, but which we do not believe affects the validity

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or enforceability of a claim in our patent rights, may, nonetheless, ultimately be found to affect the validity or enforceability of a claim. Even if patents do successfully issue and even if such patents cover our current and future product candidates, third parties may challenge their ownership, validity, enforceability or scope, which may result in such patents being narrowed, invalidated or held unenforceable, which could allow third parties to commercialize our technology or products and compete directly with us, without payment to us, or result in our inability to manufacture or commercialize products without infringing third-party patent rights. Any successful opposition to these patents or any other patents owned by us in the future or licensed to us could deprive us of rights necessary for the successful commercialization of any product candidates that we may develop. Furthermore, even if they are unchallenged, our patents rights may not adequately protect our product candidates and technology, provide exclusivity for our product candidates, prevent others from designing around our claims or provide us with a competitive advantage. Any of these outcomes could impair our ability to prevent competition from third parties. Changes in either the patent laws or interpretation of the patent laws in the United States or other countries may diminish the value of our patent rights or narrow the scope of our patent protection.

We cannot offer any assurances about whether any issued patents will be found invalid and unenforceable or will be challenged by third parties. Any successful challenge or opposition to patents owned by or licensed to us could deprive us of rights necessary for the successful commercialization of any product candidates that we may develop. Further, if we encounter delays in regulatory approvals, the period of time during which we could market a product candidate under patent protection could be reduced.

Furthermore, our patent rights may be subject to a reservation of rights by one or more third parties. For example, certain research we conducted was funded in part by the U.S. government. As a result, the U.S. government may have certain march-in rights to patents and technology arising out of such research, if any. When new technologies are developed with government funding, the government generally obtains certain rights in any resulting patents, including a non-exclusive license authorizing the government to use the invention. These rights may permit the government to disclose our confidential information to third parties and to exercise march-in rights to use or allow third parties to use our licensed technology. The government can exercise its march-in rights if it determines that action is necessary because we fail to achieve practical application of the government-funded technology, to alleviate health or safety needs, to meet requirements of federal regulations or to give preference to U.S. industry. In addition, our rights in such inventions may be subject to certain requirements to manufacture products embodying such inventions in the United States. Any exercise by the government of such rights could harm our competitive position, business, financial condition, results of operations and growth prospects.

We may not identify relevant third-party patents or may incorrectly interpret the relevance, scope or expiration of a third-party patent which might adversely affect our ability to develop and market our product candidates.

We cannot guarantee that any of our or our licensors’ patent searches or analyses, including but not limited to the identification of relevant patents, the scope of patent claims or the expiration of relevant patents, are complete or thorough, nor can we be certain that we have identified each and every third-party patent and pending application in the United States and abroad that is relevant to or necessary for the commercialization of our product candidates in any jurisdiction. For example, U.S. applications filed before November 29, 2000 and certain U.S. applications filed after that date that will not be filed outside the United States remain confidential until patents issue. Patent applications in the United States and elsewhere are published approximately 18 months after the earliest filing for which priority is claimed, with such earliest filing date being commonly referred to as the priority date. Therefore, patent applications covering our product candidates could have been filed by others without our knowledge. Additionally, pending patent applications that have been published can, subject to certain limitations, be later amended in a manner that could cover our product candidates or the use of our product candidates. The scope of a patent claim is determined by an interpretation of the law, the written disclosure in a patent and the patent’s prosecution history. Our interpretation of the relevance or the scope of a patent or a pending application may be incorrect, which may negatively impact our ability to market our product candidates. We may incorrectly determine that our product candidates are not covered by a third-party patent or may incorrectly predict whether a third party’s pending application will issue with claims of relevant scope. Our determination of the expiration date of any patent in the United States or abroad that we consider relevant may be incorrect, which may negatively impact our ability to develop and market our product candidates. Our failure to identify and correctly interpret relevant patents may negatively impact our ability to develop and market our product candidates.

The patent protection for our product candidates may expire before we are able to maximize their commercial value which may subject us to increased competition and reduce or eliminate our opportunity to generate product revenue.

Patents have a limited lifespan. In the United States, if all maintenance fees are paid timely, the natural expiration of a patent is generally 20 years from its earliest U.S. non-provisional filing date. Various extensions may be available, but the life of a patent, and the protection it affords, is limited. The patents for our product candidates have varying expiration dates and, if these patents expire, we may be subject to increased competition and we may not be able to recover our development costs. For example, our licensed U.S. patent claim for a composition of matter patent for oral sulopenem is due to expire in 2029, subject to potential extension to 2034 under the Drug Price Competition and Patent Term Restoration Act of 1984 (referred to as the Hatch-Waxman Act)

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and our newly granted patent directed to the composition of the bilayer tablet of sulopenem etzadroxil and probenecid is due to expire no earlier than 2039, absent any extensions. Given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such product candidates might expire before or shortly after such product candidates are commercialized. As a result, our patent rights may not provide us with sufficient rights to exclude others from commercializing product candidates similar or identical to ours.

The FDA designated sulopenem and oral sulopenem as QIDPs for the indications of uUTI, cUTI, cIAI, community-acquired bacterial pneumonia, acute bacterial prostatitis, gonococcal urethritis, and pelvic inflammatory disease. Fast track designation for these seven indications in both the oral and intravenous formulations has also been granted. QIDP status provides the potential for a more rapid review cycle for an NDA and could add five years to any regulatory exclusivity period that we may be granted. However, that does not guarantee that we will receive any regulatory exclusivity or that any such exclusivity will be for a period sufficient to provide us with any commercial advantage. Moreover, we do not own or license any patent directed to the compound sulopenem.

Depending upon the timing, duration and conditions of FDA marketing approval of our product candidates, one or more of the U.S. patents we currently license and/or own may be eligible for limited patent term extension under the Hatch-Waxman Act, and similar legislation in the European Union. The Hatch-Waxman Act permits a patent term extension of up to five years for a patent covering an approved product as compensation for effective patent term lost during product development and the FDA regulatory review process. A patent term extension cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval, only one patent may be extended and only those claims covering the approved drug, a method for using it or a method for manufacturing it may be extended. We may not receive an extension if we fail to apply within applicable deadlines, fail to apply prior to expiration of the relevant patents or otherwise fail to satisfy applicable requirements and the length of the extension could be less than we request. To the extent we wish to pursue patent term extension based on a patent that we in-license from Pfizer or another third party, we would need the cooperation of Pfizer or the third party. Moreover, similar extensions may be available in some of the larger economic territories but may not be available in all of our markets of interest.

If we are unable to obtain patent term extension/restoration or some other exclusivity, or the term of any such extension is less than we request, the period during which we can enforce our exclusive rights for that product will be shortened and our competitors may obtain approval to market competing products sooner. As a result, we could be subject to increased competition and our opportunity to establish or maintain product revenue could be substantially reduced or eliminated. Furthermore, we may not have sufficient time to recover our development costs prior to the expiration of our U.S. and non-U.S. patent rights. If this occurs, our competitors may take advantage of our investment in development and trials by referencing our clinical and preclinical data and launch their product earlier than might otherwise be the case. Any of the foregoing would materially harm our business, financial condition, results of operations and growth prospects.

Intellectual property rights do not necessarily address all potential threats to our business.

Once granted, patents may remain open to opposition, interference, re-examination, post-grant review,inter partes review, nullification or derivation action in court or before patent offices or similar proceedings for a given period after allowance or grant, during which time third parties can raise objections against such grant. In the course of such proceedings, which may continue for a protracted period of time, the patent owner may be compelled to limit the scope of the allowed or granted claims thus attacked, or may lose the allowed or granted claims altogether. In addition, the degree of future protection afforded by our intellectual property rights is uncertain because even granted intellectual property rights have limitations, and may not adequately protect our business. The following examples are illustrative:

•others may be able to make compounds or formulations that are similar to oral sulopenem and sulopenem compounds or formulations but that are not covered by the claims of our patent rights;

•the patents of third parties may have an adverse effect on our business;

•we or our licensors or any future strategic partners might not have been the first to conceive or reduce to practice the inventions covered by the issued patents that we own or have exclusively licensed;

•we or our licensors or any future strategic partners might not have been the first to file patent applications covering certain of our inventions;

•others may independently develop similar or alternative technologies or duplicate any of our technologies without infringing our intellectual property rights;

•it is possible our pending patent applications, and any future patent applications, will not lead to issued patents or afford meaningful protection for our product candidates;

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•issued patents that we may own in the future or have exclusively licensed may not provide us with any competitive advantage, or may be held invalid or unenforceable, as a result of legal challenges by our competitors;

•our competitors might conduct research and development activities in countries where we do not have patent rights and then use the information learned from such activities to develop competitive products for sale in our major commercial markets;

•third parties performing manufacturing or testing for us using our product candidates or technologies could use the intellectual property of others without obtaining a proper license; and

•we may not develop additional proprietary technologies that are patentable.

Should any of these events occur, they could have a material adverse effect on our business, financial condition, results of operations and growth prospects.

Changes in patent laws or patent jurisprudence could diminish the value of patents in general, thereby impairing our ability to protect our product candidates.

As is the case with other pharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining and enforcing patents in the pharmaceutical industry involves both technological complexity and legal complexity. Therefore, obtaining and enforcing pharmaceutical patents is costly, time-consuming and inherently uncertain. In addition, the America Invents Act (the AIA) was signed into law on September 16, 2011, and many of its substantive changes became effective on March 16, 2013.

An important change introduced by the AIA is that, as of March 16, 2013, the United States transitioned to a “first-to-file” system for deciding which party should be granted a patent when two or more patent applications are filed by different parties claiming the same invention. A third party that files a patent application in the U.S. Patent and Trademark Office (USPTO) after that date but before us could therefore be awarded a patent covering an invention of ours even if we had made the invention before it was made by the third party. This will require us to be cognizant going forward of the time from invention to filing of a patent application, but circumstances could prevent us from promptly filing patent applications on our inventions.

Among some of the other changes introduced by the AIA are changes that limit where a patentee may file a patent infringement suit and providing opportunities for third parties to challenge any issued patent in the USPTO, including through post-issuance patent review procedures such as inter partes review, post-grant review and covered business methods. This applies to all U.S. patents, including those issued before March 16, 2013. Because of a lower evidentiary standard in USPTO proceedings compared to the evidentiary standard in United States federal courts necessary to invalidate a patent claim, a third party could potentially provide evidence in a USPTO proceeding sufficient for the USPTO to hold a claim invalid even though the same evidence would be insufficient to invalidate the claim if first presented in a district court action. Accordingly, a third party may attempt to use the USPTO procedures to invalidate our patent claims that would not have been invalidated if first challenged by the third party as a defendant in a district court action. The AIA and its implementation could increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents.

The USPTO has developed regulations and procedures to govern administration of the AIA, and many of the substantive changes to patent law associated with the AIA. Accordingly, it is not clear what, if any, impact the AIA will have on the operation of our business and this may not be known until such time as we, or our licensors or collaboration partners, are filing patent applications for an invention or seeking to defend issued patents. However, the AIA and its implementation could increase the uncertainties and costs surrounding the prosecution of our or our licensors’ or collaboration partners’ patent applications and the enforcement or defense of our or our licensors’ or collaboration partners’ issued patents, all of which could have an adverse effect on our business and financial condition.

Moreover, the standards that the USPTO and foreign patent office’s use to grant patents are not always applied predictably or uniformly and can change. Consequently, any patents we currently license or may own or license in the future may have a shorter patent term than expected or may not contain claims that will permit us to stop competitors from using our technology or similar technology or from copying our products. Similarly, the standards that courts use to interpret patents are not always applied predictably or uniformly and may evolve, particularly as new technologies develop. In addition, changes to patent laws in the United States or other countries may be applied retroactively to affect the ownership, validity, enforceability or term of patents we currently license or may own or license in the future.

For example, the U.S. Supreme Court’s rulings on several patent cases, such as Association for Molecular Pathology v. Myriad Genetics, Inc., Mayo Collaborative Services v. Prometheus Laboratories, Inc., and Alice Corporation Pty. Ltd. v. CLS Bank International, either narrow the scope of patent protection available in certain circumstances or weaken the rights of patent owners in certain situations. In addition to increasing uncertainty with regard to our ability to obtain patents in the future, this combination of events has created uncertainty with respect to the value of patents, once obtained. Depending on decisions by the U.S. Congress, the federal courts and the USPTO, the laws and regulations governing patents could change in unpredictable ways that could weaken our ability to obtain new patents or to enforce our existing patents and patents that we might obtain in the future. Similarly, the complexity and uncertainty of European patent laws has also increased in recent years. In addition, the European patent system is relatively

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stringent in the type of amendments that are allowed during prosecution. These changes could limit our ability to obtain new patents in the future that may be important for our business.

We may become involved in lawsuits to protect or enforce our patents or other intellectual property, which could be expensive, time consuming and unsuccessful.

Competitors may infringe, misappropriate or otherwise violate our patents, trademarks, copyrights or other intellectual property or those of our licensors. To counter infringement, misappropriation, unauthorized use or other violations, we may be required to file legal claims, which can be expensive and time consuming and divert the time and attention of our management and scientific personnel. We may not be able to prevent, alone or with our licensors, infringement, misappropriation or other violations of our intellectual property rights, particularly in countries where the laws may not protect those rights as fully as in the United States. Any claims we assert against perceived infringers could provoke these parties to assert counterclaims against us alleging that we infringe their patents. In addition, in a patent infringement proceeding, there is a risk that a court will decide that a patent of ours is invalid or unenforceable, in whole or in part, and that we do not have the right to stop the other party from using the invention at issue. There is also a risk that, even if the validity of such patents is upheld, the court will construe the patent’s claims narrowly or decide that we do not have the right to stop the other party from using the invention at issue on the grounds that our patents do not cover the invention. An adverse outcome in a litigation or proceeding involving our patents could limit our ability to assert our patents against those parties or other competitors, and may curtail or preclude our ability to exclude third parties from making and selling similar or competitive products. Any of these occurrences could adversely affect our competitive business position, business prospects and financial condition. Similarly, if we assert trademark infringement claims, a court may determine that the marks we have asserted are invalid or unenforceable, or that the party against whom we have asserted trademark infringement has superior rights to the marks in question. In this case, we could ultimately be forced to cease use of such trademarks.

In any infringement, misappropriation or other intellectual property litigation, any award of monetary damages we receive may not be commercially valuable. Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during litigation. Moreover, there can be no assurance that we will have sufficient financial or other resources to file and pursue such infringement claims, which typically last for years before they are concluded. Even if we ultimately prevail in such claims, the monetary cost of such litigation and the diversion of the attention of our management and scientific personnel could outweigh any benefit we receive as a result of the proceedings.

Third parties may initiate legal proceedings alleging that we are infringing, misappropriating or otherwise violating their intellectual property rights, the outcome of which would be uncertain and could have a negative impact on the success of our business.

Our commercial success depends, in part, upon our ability, and the ability of our future collaborators, to develop, manufacture, market and sell oral sulopenem, sulopenem and any future product candidates, if approved, and use our proprietary technologies without alleged or actual infringement, misappropriation or other violation of the patents and other intellectual property rights of third parties. There have been many lawsuits and other proceedings involving patent and other intellectual property rights in the biotechnology and pharmaceutical industries, including patent infringement lawsuits, interferences, oppositions and reexamination proceedings before the USPTO and corresponding foreign patent offices. Numerous U.S. and foreign issued patents and pending patent applications, which are owned by third parties, exist in the fields in which we are developing product candidates. Some claimants may have substantially greater resources than we do and may be able to sustain the costs of complex intellectual property litigation to a greater degree and for longer periods of time than we could. In addition, patent holding companies that focus solely on extracting royalties and settlements by enforcing patent rights may target us. As the biotechnology and pharmaceutical industries expand and more patents are issued, the risk increases that our product candidates may be subject to claims of infringement of the intellectual property rights of third parties.

We may in the future become party to, or be threatened with, adversarial proceedings or litigation regarding intellectual property rights with respect to oral sulopenem, sulopenem or any future product candidates and technology, including interference or derivation proceedings, post grant review and inter partes review before the USPTO or similar adversarial proceedings or litigation in other jurisdictions. Similarly, we or our licensors or collaborators may initiate such proceedings or litigation against third parties, e.g., to challenge the validity or scope of intellectual property rights controlled by third parties. In order to successfully challenge the validity of any U.S. patent in federal court, we would need to overcome a presumption of validity. As this burden is a high one requiring us to present clear and convincing evidence as to the invalidity of any such U.S. patent claim, there is no assurance that a court would invalidate the claims of any such U.S. patent. Moreover, third parties may assert infringement claims against us based on existing patents or patents that may be granted in the future, regardless of their merit. There is a risk that third parties may choose to engage in litigation with us to enforce or to otherwise assert their patent rights against us. Even if we believe such claims are without merit, a court of competent jurisdiction could hold that these third-party patents are valid, enforceable and infringed, and the holders of any such patents may be able to block our ability to commercialize such product candidate unless we obtained a license under the applicable patents, or until such patents expire or are finally determined to be invalid or unenforceable. Similarly, if any third-party

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patents were held by a court of competent jurisdiction to cover aspects of our compositions, formulations, or methods of treatment, prevention or use, the holders of any such patents may be able to block our ability to develop and commercialize the applicable product candidate unless we obtained a license or until such patent expires or is finally determined to be invalid or unenforceable. In either case, such a license may not be available on commercially reasonable terms, or at all. Even if we were able to obtain a license, it could be nonexclusive, thereby giving our competitors access to the same technologies licensed to us. Furthermore, even in the absence of litigation, we may need to obtain licenses from third parties to advance our research. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all. In such an event, we would be unable to further practice our technologies or develop and commercialize any of our product candidates at issue, which could harm our business significantly.

Parties making claims against us may obtain injunctive or other equitable relief, which could effectively block our ability to further develop and commercialize one or more of our product candidates, if approved. Defense of these claims, regardless of their merit, would involve substantial litigation expense and would be a substantial diversion of management and employee time and resources from our business. Third parties making such claims may have the ability to dedicate substantially greater resources to these legal actions than we or our licensors or collaborators can. In the event of a successful claim of infringement, misappropriation or other violation against us, we may have to pay substantial damages, including treble damages and attorneys’ fees for willful infringement, pay royalties, redesign our infringing products or obtain one or more licenses from third parties, which may be impossible or require substantial time and monetary expenditure.

There has been substantial litigation and other proceedings regarding patent and other intellectual property rights in the pharmaceutical and biotechnology industries. In addition to infringement claims against us, we may become a party to other patent litigation and other adversarial proceedings such as proceedings before the Patent Trial and Appeal Board and opposition proceedings in the European Patent Office regarding intellectual property rights with respect to our products and technology.

Patent litigation and other proceedings may also absorb significant management time. The cost to us of any patent litigation or other proceeding, even if resolved in our favor, could be substantial. During the course of any patent or other intellectual property litigation or other proceeding, there could be public announcements of the results of hearings, rulings on motions, and other interim proceedings or developments and if securities analysts or investors regard these announcements as negative, the perceived value of our product candidates or intellectual property could be diminished. Accordingly, the market price of our ordinary shares may decline. Uncertainties resulting from the initiation and continuation of patent litigation or other proceedings could have a material adverse effect on our business, ability to compete in the marketplace, financial condition, results of operations and growth prospects.

We may not be able to protect our intellectual property rights globally, which could negatively impact our business.

Filing, prosecuting and defending patents covering oral sulopenem, sulopenem and any future product candidates globally would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can be less extensive than those in the United States. In addition, the laws of some countries do not protect intellectual property rights to the same extent as federal and state laws in the United States. Further, licensing partners may not prosecute patents in certain jurisdictions in which we may obtain commercial rights, thereby precluding the possibility of later obtaining patent protection in these countries. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and may also export infringing products to territories where we have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our product candidates, and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property protection, particularly those relating to biotechnology products, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions, whether or not successful, could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly and any current or future patent applications at risk of not issuing, and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license. Furthermore, while we intend to protect our intellectual property rights in our expected significant markets, we cannot ensure that we will be able to initiate or maintain similar efforts in all jurisdictions in which we may wish to market our product candidates. Accordingly, our efforts to protect our intellectual property rights in such countries may be inadequate, which may have an adverse effect on our ability to successfully commercialize our product candidates in all of our expected significant foreign markets.

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It is expected that by the end of 2023, owners of European patents or European patent applications will have the option, upon grant of a patent, to request a Unitary Patent which will be subject to the jurisdiction of the Unitary Patent Court (UPC). This will be a significant change in European patent practice. As the UPC is a new court system, there is no precedent for the court, thereby increasing the uncertainty of any potential litigation. It is our initial belief that the UPC, while offering a cheaper streamlined process, has potential disadvantages to patent holders, such as making a single European patent vulnerable to challenges in all participating jurisdictions when challenged in a single participating jurisdiction. Given the present uncertainty, we plan to opt out of the UPC where we are able.

Additionally, the requirements for patentability may differ in certain countries, particularly developing countries. For example, unlike other countries, China has a heightened requirement for patentability, and specifically requires a detailed description of medical uses of a claimed drug. In India, unlike the United States, there is no link between regulatory approval of a drug and its patent status. Furthermore, generic or biosimilar drug manufacturers or other competitors may challenge the scope, validity or enforceability of our or our licensors’ patents, requiring us or our licensors to engage in complex, lengthy and costly litigation or other proceedings. Generic or biosimilar drug manufacturers may develop, seek approval for, and launch biosimilar versions of our products. In addition, certain countries in Europe and developing countries, including China and India, have compulsory licensing laws under which a patent owner may be compelled to grant licenses to third parties. In those countries, we and our licensors may have limited remedies if patents are infringed or if we or our licensors are compelled to grant a license to a third party, which could materially diminish the value of those patents. This could limit our potential revenue opportunities. Accordingly, our and our licensors’ efforts to enforce intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we own or license.

We may be subject to claims that we or our employees, consultants, contractors or advisors have infringed, misappropriated or otherwise violated the intellectual property of a third party, or claiming ownership of what we regard as our own intellectual property.

Many of our employees were previously employed at universities or other biotechnology or pharmaceutical companies, including our competitors or potential competitors. Although we try to ensure that our employees do not use the intellectual property and other proprietary information, know-how or trade secrets of others in their work for us, we may be subject to claims that we or these employees have used or disclosed such intellectual property or other proprietary information. Litigation may be necessary to defend against these claims.

In addition, we may in the future be subject to claims that former employees, collaborators or other third parties have an interest in our patents or other intellectual property as an inventor or co-inventor. While we typically require our employees, consultants and contractors who may be involved in the development of intellectual property to execute agreements assigning such intellectual property to us, we may be unsuccessful in executing such an agreement with each party who in fact develops intellectual property that we regard as our own. To the extent that we fail to obtain such assignments, such assignments do not contain a self-executing assignment of intellectual property rights or such assignments are breached, we may be forced to bring claims against third parties, or defend claims they may bring against us, to determine the ownership of what we regard as our intellectual property. If we fail in prosecuting or defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel. Such intellectual property rights could be awarded to a third party, and we could be required to obtain a license from such third party to commercialize our technology or products. Such a license may not be available on commercially reasonable terms or at all. Even if we are successful in prosecuting or defending against such claims, litigation could result in substantial costs and be a distraction to our management and scientific personnel.

Obtaining and maintaining our patent protection depends on compliance with various procedural, document submission, fee payment and other requirements imposed by governmental patent agencies, and our patent protection could be reduced or eliminated for non-compliance with these requirements.

Periodic maintenance and annuity fees on any issued patent are due to be paid to the USPTO and foreign patent agencies in several stages over the lifetime of the patent. The USPTO and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other similar provisions during the patent application process. While an inadvertent lapse can in many cases be cured by payment of a late fee or by other means in accordance with the applicable rules, there are situations in which non-compliance can result in abandonment or lapse of the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. Non-compliance events that could result in abandonment or lapse of a patent or a patent application include failure to respond to official actions within prescribed time limits, non-payment of fees and failure to properly legalize and submit formal documents. If we or our licensors fail to maintain the patents covering our products, our

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competitors might be able to enter the market, which would have a material adverse effect on our business, financial condition, results of operations and growth prospects.

If we are unable to protect the confidentiality of our trade secrets, the value of our technology could be materially adversely affected and our business would be harmed.

In addition to seeking patents for some of our technology and products, we also rely on trade secrets, including unpatented know-how, technology and other proprietary information, in seeking to develop and maintain a competitive position. We seek to protect these trade secrets, in part, by entering into non-disclosure and confidentiality agreements with parties who have access to them, such as our employees, consultants, independent contractors, advisors, corporate collaborators, outside scientific collaborators, contract manufacturers, suppliers and other third parties. We, as well as our licensors, also enter into confidentiality and invention or patent assignment agreements with employees and certain consultants. We also seek to preserve the integrity and confidentiality of our data, trade secrets and know-how by maintaining physical security of our premises and physical and electronic security of our information technology systems. Monitoring unauthorized uses and disclosures is difficult, and we do not know whether the steps we have taken to protect our proprietary technologies will be effective. We cannot guarantee that our trade secrets and other proprietary and confidential information will not be disclosed or that competitors will not otherwise gain access to our trade secrets. Any party with whom we have executed such an agreement may breach that agreement and disclose our proprietary information, including our trade secrets, and we may not be able to obtain adequate remedies for such breaches. Enforcing a claim that a party illegally disclosed or misappropriated a trade secret is difficult, expensive and time consuming and the outcome is unpredictable. In addition, some courts both within and outside the United States may be less willing or unwilling to protect trade secrets. Further, if any of our trade secrets were to be lawfully obtained or independently developed by a competitor, we would have no right to prevent such third party, or those to whom they communicate such technology or information, from using that technology or information to compete with us. If any of our trade secrets were to be disclosed to or independently developed by a competitor, our business and competitive position could be harmed.

Trade secrets and know-how can be difficult to protect as trade secrets and know-how will over time be disseminated within the industry through independent development, the publication of journal articles, and the movement of personnel skilled in the art from company to company or academic to industry scientific positions. If we fail to prevent material disclosure of the know-how, trade secrets and other intellectual property related to our technologies to third parties, we will not be able to establish or maintain a competitive advantage in our market, which could materially adversely affect our business, results of operations and financial condition. Even if we are able to adequately protect our trade secrets and proprietary information, our trade secrets could otherwise become known or could be independently discovered by our competitors. For example, competitors could purchase our products and attempt to replicate some or all of the competitive advantages we derive from our development efforts, design around our protected technology or develop their own competitive technologies that fall outside of our intellectual property rights. If any of our trade secrets were to be lawfully obtained or independently developed by a competitor, in the absence of patent protection, we would have no right to prevent them, or those to whom they communicate, from using that technology or information to compete with us.

We may not be able to prevent misappropriation of our intellectual property, trade secrets or confidential information, particularly in countries where the laws may not protect those rights as fully as in the United States. Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation.

We have not yet registered our trademarks in certain jurisdictions. Failure to secure those registrations could adversely affect our business.

We have registered trademarks for “Iterum” and certain other trademarks for product candidates in certain jurisdictions including the United States, European Union, Japan, Switzerland and Canada. If we are unable to secure registrations for our trademarks in other countries, we may encounter more difficulty in enforcing them against third parties than we otherwise would, which could adversely affect our business. We are in the process of registering trademarks for our product candidates in the United States, Europe and Canada. Any trademark applications we have filed for our product candidates or may file in the future are not guaranteed to be allowed for registration, and even if they are, we may fail to maintain or enforce such registered trademarks. During trademark registration proceedings in the United States, Europe, Canada and other jurisdictions, we may receive rejections. We are given an opportunity to respond to those rejections, but we may not be able to overcome such rejections. In addition, in the USPTO and in comparable agencies in many other jurisdictions, third parties are given an opportunity to oppose pending trademark applications and to seek to cancel registered trademarks. Opposition or cancellation proceedings may be filed against our trademarks, and our trademarks may not survive such proceedings.

In addition, any proprietary name we propose to use with oral sulopenem, sulopenem or any other product candidate in the United States must be approved by the FDA, and in Europe by the EMA, regardless of whether we have registered it, or applied to

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register it, as a trademark. The FDA and the EMA each typically conduct a review of proposed product names, including an evaluation of potential for confusion with other product names. We had submitted our proposed proprietary name for oral sulopenem in connection with our NDA for oral sulopenem and we received conditional acceptance from the FDA at that time. However, as provided in the CRL received in July 2021, we will be required to resubmit the proposed proprietary name if and when we respond to the application deficiencies and resubmit the NDA for oral sulopenem and as such, there is no guarantee that the FDA will conclude that the proprietary name continues to be acceptable when resubmitted. If the FDA objects to our proposed proprietary product name, we may be required to expend significant additional resources in an effort to identify a suitable proprietary product name that would qualify under applicable trademark laws, not infringe, misappropriate or otherwise violate the existing rights of third parties and be acceptable to the FDA.

Over the long term, if we are unable to establish name recognition based on our trademarks and trade names, then we may not be able to compete effectively and our business may be adversely affected. Our efforts to enforce or protect our proprietary rights related to trademarks, trade secrets, domain names, copyrights or other intellectual property may be ineffective and could result in substantial costs and diversion of resources and could adversely impact our business, financial condition, results of operations and growth prospects.

Risks Related to Regulatory Approval and Other Legal Compliance Matters

If we are not able to obtain, or if there are delays in obtaining, required regulatory approvals, we will not be able to commercialize oral sulopenem, sulopenem or other future product candidates, and our ability to generate revenue will be materially impaired.

Our product candidates, oral sulopenem and sulopenem, and the activities associated with their development and commercialization, including their design, testing, manufacture, safety, efficacy, recordkeeping, labeling, storage, approval, advertising, promotion, sale and distribution, are subject to comprehensive regulation by the FDA and other regulatory agencies in the United States and by comparable foreign regulatory authorities, with regulations differing from country to country. Failure to obtain marketing approval for a product candidate will prevent us from commercializing the product candidate. We currently do not have any products approved for sale in any jurisdiction. We have only limited experience in filing and supporting the applications necessary to gain marketing approvals and expect to rely on third-party CROs to assist us in this process.

Although we have QIDP status and fast track designation for sulopenem and oral sulopenem for the indications of uUTI, cUTI and cIAI (and for the indications of community-acquired bacterial pneumonia, acute bacterial prostatitis, gonococcal urethritis, and pelvic inflammatory disease) which may provide for a more rapid NDA review cycle, the time required to obtain approval, if any, by the FDA and comparable foreign authorities is unpredictable and typically takes many years following the commencement of clinical trials and depends upon numerous factors, including the substantial discretion of the regulatory authorities. Approval policies, regulations, or the type and amount of clinical data necessary to gain approval may also change during the course of a product candidate’s clinical development and may vary among jurisdictions. We have not obtained regulatory approval for any product candidate and it is possible that we will not be able to obtain regulatory approval for sulopenem or any product candidates or other indications that we may seek to develop in the future will ever obtain regulatory approval. Neither we nor any future collaborator is permitted to market any of our product candidates in the United States until we or they receive regulatory approval of an NDA(s) from the FDA.

In order to obtain approval to commercialize a product candidate in the United States or abroad, we or our collaborators must demonstrate to the satisfaction of the FDA or foreign regulatory agencies, that such product candidates are safe and effective for their intended uses. Results from non-clinical studies and clinical trials can be interpreted in different ways. Even if we believe that the non-clinical or clinical data for our product candidates are promising, such data may not be sufficient to support approval by the FDA and other regulatory authorities. Although we conducted our prior Phase 3 clinical trials pursuant to SPA agreements, met with the FDA at a pre-NDA meeting and had our NDA application accepted for review by the FDA in January 2021, we received a CRL from the FDA on July 23, 2021 in respect of our NDA. The CRL provided that the FDA had completed its review of the NDA and had determined that it could not approve the NDA in its present form. The CRL further provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. There can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing Phase 3 clinical trial

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intended to support a resubmission of our NDA or that any data generated by such clinical trial will be adequate to support resubmission or approval of our NDA.

An NDA must include extensive preclinical and clinical data and supporting information to establish the product candidate’s safety and efficacy for each desired indication. The NDA must also include significant information regarding the CMC for the product candidate. Obtaining approval of an NDA is a lengthy, expensive and uncertain process. The FDA has substantial discretion in the review and approval process and may refuse to accept for filing any application or may decide that our data is insufficient for approval and require additional non-clinical, clinical or other studies. Foreign regulatory authorities have differing requirements for approval of drugs with which we must comply prior to marketing. Obtaining marketing approval for marketing of a product candidate in one country does not ensure that we will be able to obtain marketing approval in other countries, but the failure to obtain marketing approval in one jurisdiction could negatively affect our ability to obtain marketing approval in other jurisdictions. The FDA or any foreign regulatory body can delay, limit or deny approval of our product candidates or require us to conduct additional non-clinical or clinical testing or abandon a program for many reasons, including:

•the FDA or the applicable foreign regulatory agency’s disagreement with the design or implementation of our clinical trials, such as the FDA stating in the CRL received in July 2021 that additional data are necessary to support approval of oral sulopenem;

•negative or ambiguous results from our clinical trials or results that may not meet the level of statistical significance required by the FDA or comparable foreign regulatory agencies for approval;

•serious and unexpected drug-related side effects experienced by participants in our clinical trials or by individuals using drugs similar to our product candidates;

•our inability to demonstrate to the satisfaction of the FDA or the applicable foreign regulatory body that our product candidates are safe and effective for the proposed indication(s);

•the FDA’s or the applicable foreign regulatory agency’s disagreement with the interpretation of data from non-clinical studies or clinical trials;

•our inability to demonstrate the clinical and other benefits of our product candidates outweigh any safety or other perceived risks;

•the FDA’s or the applicable foreign regulatory agency’s requirement for additional non-clinical studies or clinical trials, such as the FDA’s request for additional clinical trial work in the CRL received in July 2021;

•the FDA’s or the applicable foreign regulatory agency’s disagreement regarding the formulation, labeling and/or the specifications for our product candidates; or

•the potential for approval policies or regulations of the FDA or the applicable foreign regulatory agencies to significantly change in a manner rendering our clinical data insufficient for approval.

Of the large number of drugs in development, only a small percentage complete the FDA or foreign regulatory approval processes and are successfully commercialized. The lengthy review process as well as the unpredictability of future clinical trial results may result in our failing to obtain regulatory approval, which would significantly harm our business, financial condition, results of operations and growth prospects.

Even if we eventually receive approval of an NDA or foreign marketing application for our product candidates, the FDA or the applicable foreign regulatory agency may grant approval contingent on the performance of costly additional clinical trials, often referred to as Phase 4 clinical trials, and the FDA may require the implementation of a REMS, which may be required to ensure safe use of the drug after approval. The FDA or the applicable regulatory agency also may approve a product candidate for a more limited indication or patient population than we originally requested, and the FDA or applicable foreign regulatory agency may not approve the labeling that we believe is necessary or desirable for the successful commercialization of a product candidate. Any delay in obtaining, or inability to obtain, applicable regulatory approval would delay or prevent commercialization of that product candidate and would materially adversely impact our business and prospects.

Although we are conducting the ongoing Phase 3 clinical trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) under an SPA agreement with the FDA, an SPA agreement does not guarantee marketing approval of, or any other particular outcome from, regulatory review.

We are conducting the ongoing Phase 3 clinical trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) under an SPA agreement with the FDA. Under the SPA process, the FDA provides a clinical trial sponsor with an official evaluation and written guidance on the design of a proposed protocol intended to form the basis for an NDA. An SPA agreement indicates concurrence by the FDA with the adequacy and acceptability of specific critical elements of the overall protocol design for a clinical

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trial intended to support a future marketing application, but it does not indicate FDA concurrence on every protocol detail. An SPA agreement also does not ensure the receipt of marketing approval or that the approval process will be faster than conventional procedures. A determination regarding marketing approval is addressed during the review of a submitted NDA and depends on efficacy and safety results and an evaluation of the overall benefits and risks of treatment after review of the data from the development program in its totality.

Even after the FDA agrees to the design, execution, and analysis proposed in a protocol reviewed under the SPA process, the FDA may revoke or alter its agreement if a substantial scientific issue essential to determining the safety or effectiveness of the drug has been identified after the testing has begun. An SPA agreement may also be changed through written agreement between the sponsor and the FDA. A revocation or alteration in an existing SPA agreement could delay or prevent approval an NDA. In addition, any significant change to the protocol for a clinical trial subject to an SPA agreement would require prior FDA approval, which could delay implementation of such a change and the conduct of the related clinical trial. The FDA retains significant discretion in interpreting the terms of the SPA agreement and the data and results from any study that is the subject of the SPA agreement.

Disruptions in the FDA and other government agencies caused by funding shortages or global health concerns could hinder their ability to hire and retain key leadership and other personnel, or otherwise prevent new products and services from being developed or commercialized in a timely manner, which could negatively impact our business.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels, ability to hire and retain key personnel and accept the payment of user fees, and statutory, regulatory, and policy changes and other events that may otherwise affect the FDA’s ability to perform routine functions. Average review times at the agency have fluctuated in recent years as a result. In addition, government funding of other government agencies that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable.

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs to be reviewed or approved by necessary government agencies, which would adversely affect our business. For example, over the last several years, including for 35 days beginning on December 22, 2018, the U.S. government has shut down several times and certain regulatory agencies, such as the FDA, have had to furlough critical employees and stop critical activities. If a prolonged government shutdown occurs, it could significantly impact the ability of the FDA to timely review and process our regulatory submissions, which could have a material adverse effect on our business.

If a prolonged government shutdown or other disruption occurs, it could significantly impact the ability of the FDA to timely review and process our regulatory submissions, which could have a material adverse effect on our business. Future shutdowns or other disruptions could also affect other government agencies such as the SEC, which may also impact our business by delaying review of our public filings, to the extent such review is necessary, and our ability to access the public markets.

If we are unable to obtain marketing approval in jurisdictions outside the United States, we will not be able to market our product candidates outside of the United States.

In order to market and sell oral sulopenem, sulopenem or our other future product candidates in the European Union and many other jurisdictions, we must obtain separate marketing approvals and comply with numerous and varying regulatory requirements. Approval by the FDA does not ensure approval by regulatory authorities in other countries or jurisdictions, and approval by one regulatory authority outside the United States does not ensure approval by regulatory authorities in other countries or jurisdictions or by the FDA. The approval procedure varies among countries and can involve additional testing. In addition, clinical trials conducted in one country may not be accepted by regulatory authorities in other countries. For example, although we have obtained agreement on an SPA with the FDA for the additional Phase 3 clinical trial for oral sulopenem, the EMA or other regulatory authorities may not agree with the overall protocol design for this additional clinical trial. The time required to obtain approval may differ substantially from that required to obtain FDA approval. The regulatory approval process outside the United States generally includes all of the risks associated with obtaining FDA approval. In addition, in many countries outside the United States, it is required that the product be approved for reimbursement before the product can be approved for sale in that country. We may not obtain approvals from regulatory authorities outside the United States on a timely basis or at all.

For example, we obtained scientific advice from the EMA for each of the prior Phase 3 clinical trials in the uUTI, cUTI and cIAI indications, as well as to gain alignment on non-clinical supportive information required for EMA submission. We are not in alignment with regard to the comparator agent selected for the cUTI clinical trial and would need to consider other options to accommodate a European filing for this indication. The EMA may request that we conduct one or more additional clinical trials or non-clinical studies to support potential approval for oral sulopenem and sulopenem for the cUTI indication. We cannot predict how the EMA will interpret the data and results from our Phase 3 clinical trial and other elements of our development program, or whether oral sulopenem or sulopenem will receive any regulatory approvals in the European Union.

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We are currently evaluating our commercialization strategy in the United States and other territories. We believe that in addition to the United States, Europe represents a significant market opportunity because of rising rates of extended spectrum ß-lactamases (ESBL) resistance.

On June 23, 2016, the electorate in the United Kingdom voted in favor of leaving the European Union, commonly referred to as Brexit. Following protracted negotiations, the United Kingdom left the European Union on January 31, 2020 and a transition period to December 31, 2020, was established to allow the United Kingdom and the European Union to negotiate the United Kingdom’s withdrawal. As a result, effective January 1, 2021, the United Kingdom is no longer part of the European Single Market and European Union Customs Union.

Since the regulatory framework for pharmaceutical products in the United Kingdom covering the quality, safety, and efficacy of pharmaceutical products, clinical trials, marketing authorization, commercial sales, and distribution of pharmaceutical products is derived from European Union directives and regulations, the consequences of Brexit and the impact the future regulatory regime that applies to products and the approval of product candidates in the United Kingdom remains unclear. As of January 1, 2021, the Medicines and Healthcare products Regulatory Agency, or the MHRA, became responsible for supervising medicines and medical devices in Great Britain, comprising England, Scotland and Wales under domestic law, whereas Northern Ireland will continue to be subject to European Union rules under the Northern Ireland Protocol. The MHRA will rely on the Human Medicines Regulations 2012 (SI 2012/1916) (as amended), or the HMR, as the basis for regulating medicines. The HMR has incorporated into the domestic law of the body of European Union law instruments governing medicinal products that pre-existed prior to the United Kingdom’s withdrawal from the European Union. Any delay in obtaining, or an inability to obtain, any marketing approvals, as a result of Brexit or otherwise, may force us to restrict or delay efforts to seek regulatory approval in the United Kingdom for our product candidates, which could significantly and materially harm our business.

If we receive regulatory approval for any product candidate, we will be subject to ongoing obligations and continuing regulatory review, which may result in significant additional expense. Our product candidates, including oral sulopenem and sulopenem, if approved, could be subject to restrictions or withdrawal from the market, and we may be subject to penalties if we fail to comply with regulatory requirements or if we experience unanticipated problems with our product candidates, when and if approved.

Any product candidate, including oral sulopenem and sulopenem, for which we obtain marketing approval will also be subject to ongoing regulatory requirements for labeling, packaging, storage, distribution, advertising, promotion, record-keeping and submission of safety and other post marketing information. For example, approved products, manufacturers and manufacturers’ facilities are required to comply with extensive FDA requirements, including ensuring that quality control and manufacturing procedures conform to cGMPs. As such, we and our contract manufacturers will be subject to continual review and periodic inspections to assess compliance with cGMPs. Accordingly, we and others with whom we work must continue to expend time, money and effort in all areas of regulatory compliance, including manufacturing, production and quality control. We will also be required to report certain adverse reactions and production problems, if any, to the FDA and to comply with requirements concerning advertising and promotion for our products.

In addition, even if marketing approval of a product candidate is granted, the approval may be subject to limitations on the indicated uses for which the product may be marketed, may be subject to significant conditions of approval or may impose requirements for costly post-marketing testing and surveillance to monitor the safety or efficacy of the product. The FDA may also require a REMS as a condition of approval of our product candidates, which could include requirements for a medication guide, physician communication plans or additional elements to ensure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. The FDA closely regulates the post-approval marketing and promotion of drugs to ensure that drugs are marketed only for the approved indications and in accordance with the provisions of the approved labeling and regulatory requirements. The FDA also imposes stringent restrictions on manufacturers’ communications regarding off-label use and if we do not restrict the marketing of our products only to their approved indications, we may be subject to enforcement action for off-label marketing. In September 2021, the FDA published final regulations which describe the types of evidence that the agency will consider in determining the intended use of a drug product.

If a regulatory agency discovers previously unknown problems with a product, such as adverse events of unanticipated severity or frequency, or problems with the facility where the product is manufactured, or disagrees with the promotion, marketing or labeling of a product, it may impose restrictions on that product or us. In addition, if any product fails to comply with applicable regulatory requirements, a regulatory agency may:

•issue fines, warning letters, untitled letters or impose holds on clinical trials if any are still ongoing;

•mandate modifications to promotional materials or require provision of corrective information to healthcare practitioners;

•impose restrictions on the product or its manufacturers or manufacturing processes;

•impose restrictions on the labeling or marketing of the product;

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•impose restrictions on product distribution or use;

•require post-marketing clinical trials;

•require withdrawal of the product from the market;

•refuse to approve pending applications or supplements to approved applications that we submit;

•require recall of the product;

•require entry into a consent decree, which can include imposition of various fines (including restitution or disgorgement of profits or revenue), reimbursements for inspection costs, required due dates for specific actions and penalties for non-compliance;

•suspend or withdraw marketing approvals;

•refuse to permit the import or export of the product;

•seize or detain supplies of the product; or

•issue injunctions or impose civil or criminal penalties.

Similar restrictions apply to the approval of our products in the European Union. The holder of a marketing authorization is required to comply with a range of requirements applicable to the manufacturing, marketing, promotion and sale of medicinal products. These include compliance with the European Union’s stringent pharmacovigilance or safety reporting rules, which can impose post-authorization studies and additional monitoring obligations; the manufacturing of authorized medicinal products, for which a separate manufacturer’s license is mandatory; and the marketing and promotion of authorized drugs, which are strictly regulated in the European Union and are also subject to EU Member State laws.

Accordingly, in connection with our currently approved products and assuming we, or our collaborators, receive marketing approval for one or more of our product candidates, we, and our collaborators, and our and their contract manufacturers will continue to expend time, money and effort in all areas of regulatory compliance, including manufacturing, production, product surveillance and quality control. If we, and our collaborators, are not able to comply with post-approval regulatory requirements, our or our collaborators’ ability to market any future products could be limited, which could adversely affect our ability to achieve or sustain profitability. Further, the cost of compliance with post-approval regulations may have a negative effect on our operating results and financial condition.

Any relationships we may have with customers, healthcare providers and professionals and third-party payors, among others, will be subject to applicable anti-kickback, fraud and abuse and other healthcare laws and regulations, which could expose us to penalties, including criminal sanctions, civil penalties, contractual damages, reputational harm, fines, disgorgement, exclusion from participation in government healthcare programs, curtailment or restricting of our operations and diminished profits and future earnings.

Healthcare providers, physicians and third-party payors will play a primary role in the recommendation and prescription of any products for which we are able to obtain marketing approval. Any arrangements we have with healthcare providers, third-party payors and customers will subject us to broadly applicable fraud and abuse and other healthcare laws and regulations. The laws and regulations may constrain the business or financial arrangements and relationships through which we conduct clinical research, market, sell and distribute any products for which we obtain marketing approval. These include the following:

•Anti-Kickback Statute. The federal Anti-Kickback Statute prohibits, among other things, persons and entities from knowingly and willfully soliciting, offering, receiving or providing remuneration (including any kickback, bribe or rebate), directly or indirectly, in cash or in kind, to induce or reward or in return for, either the referral of an individual for or the purchase, lease or order of a good, facility, item or service for which payment may be made under a federal healthcare program such as Medicare and Medicaid.

•False Claims Laws. The federal false claims and civil monetary penalties laws, including the federal civil False Claims Act, impose criminal and civil penalties, including through civil whistleblower or qui tam actions against individuals or entities for, among other things, knowingly presenting or causing to be presented false or fraudulent claims for payment by a federal healthcare program or making a false statement or record material to payment of a false claim or avoiding, decreasing or concealing an obligation to pay money to the federal government, with potential liability including mandatory treble damages and significant per-claim penalties.

•Health Insurance Portability and Accountability Act of 1996 (HIPAA). HIPAA imposes criminal and civil liability for, among other things, executing a scheme or making materially false statements in connection with the delivery of or payment for health care benefits, items or services. Additionally, HIPAA, as amended by the Health Information

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Technology for Economic and Clinical Health Act and its implementing regulations, also imposes obligations on covered entities and their business associates that perform certain functions or activities that involve the use or disclosure of protected health information on their behalf, including mandatory contractual terms and technical safeguards, with respect to maintaining the privacy, security and transmission of individually identifiable health information.

•Transparency Requirements. The federal Physician Payments Sunshine Act requires certain manufacturers of drugs, devices, biologics and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health Insurance Program, with specific exceptions, to report annually to CMS information related to payments or transfers of value made to physicians, other healthcare providers and teaching hospitals, as well as information regarding ownership and investment interests held by physicians and their immediate family members.

•Analogous State and Foreign Laws. Analogous state and foreign fraud and abuse laws and regulations, such as state anti-kickback and false claims laws, can apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors and are generally broad and are enforced by many different federal and state agencies as well as through private actions. Some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government and require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures. State and foreign laws also govern the privacy and security of health information in some circumstances, many of which differ from each other in significant ways and often are not pre-empted by HIPAA, thus complicating compliance efforts.

Efforts to ensure that any business arrangements we have with third parties and our business generally, will comply with applicable healthcare laws and regulations will involve substantial costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative penalties, damages, fines, individual imprisonment, additional reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, exclusion of products from government funded healthcare programs, such as Medicare and Medicaid, disgorgement, contractual damages, reputational harm and the curtailment or restructuring of our operations. Defending against any such actions can be costly, time-consuming and may require significant financial and personnel resources. Therefore, even if we are successful in defending against any such actions that may be brought against us, our business may be impaired. Further, if any of the physicians or other healthcare providers or entities with whom we expect to do business is found to be not in compliance with applicable laws, they may be subject to criminal, civil or administrative sanctions, including exclusions from government funded healthcare programs.

The provision of benefits or advantages to physicians to induce or encourage the prescription, recommendation, endorsement, purchase, supply, order or use of medicinal products is also prohibited in the European Union. The provision of benefits or advantages to physicians is governed by the national anti-bribery laws of EU Member States. In addition, payments made to physicians in certain EU Member States must be publicly disclosed. Moreover, agreements with physicians often must be the subject of prior notification and approval by the physician’s employer, his or her competent professional organization and/or the regulatory authorities of the individual EU Member States. These requirements are provided in the national laws, industry codes or professional codes of conduct, applicable in the EU Member States. Failure to comply with these requirements could result in reputational risk, public reprimands, administrative penalties, fines or imprisonment.

Healthcare legislative reform measures may have a material adverse effect on our business and results of operations.

In the United States, there have been and continue to be a number of legislative and regulatory changes, and proposed changes, that could affect the future results of our business and operations. In particular, there have been and continue to be a number of initiatives at the federal and state levels that seek to reduce healthcare costs. For example, in March 2010 the Patient Protection and Affordable Care Act (as amended by the Health Care and Education Reconciliation Act) (ACA) was enacted, which has substantially changed the way health care is financed by both governmental and private insurers, and significantly impacted the U.S. pharmaceutical industry.

In addition, other legislative changes have been proposed and adopted since the ACA was enacted. In August 2011, the Budget Control Act of 2011, among other things, created measures for spending reductions by Congress. A Joint Select Committee on Deficit Reduction, tasked with recommending a targeted deficit reduction of at least $1.2 trillion for the years 2013 through 2021, was unable to reach required goals, thereby triggering the legislation’s automatic reduction to several government programs. These changes included aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, which went into effect in April 2013. The Coronavirus Aid, Relief, and Economic Security (CARES) Act suspended the 2% Medicare sequester from May 1, 2020 through December 31, 2020, and extended the sequester by one year, through 2031.These Medicare sequester reductions were suspended through the end of June 2022 but the full 2% cut resumed thereafter on July 1, 2022. The American Taxpayer Relief Act of

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2012, among other things, reduced Medicare payments to several providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. These new laws may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtain for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used. Under current legislation, the actual reductions in Medicare payments may vary up to 4%.

Since enactment of the ACA, there have been, and continue to be, numerous legal challenges and Congressional actions to repeal and replace provisions of the law. For example, with enactment of the Tax Cuts and Jobs Act of 2017, or the TCJA, Congress repealed the “individual mandate.” The repeal of this provision, which requires most Americans to carry a minimal level of health insurance, became effective in 2019. Further, on December 14, 2018, a U.S. District Court judge in the Northern District of Texas ruled that the individual mandate portion of the ACA is an essential and inseverable feature of the ACA, and therefore because the mandate was repealed as part of the TCJA, the remaining provisions of the ACA are invalid as well. The U.S. Supreme Court heard this case on November 10, 2020 and, on June 17, 2021, dismissed this action after finding that the plaintiffs do not have standing to challenge the constitutionality of the ACA. Litigation and legislation over the ACA are likely to continue, with unpredictable and uncertain results.

The Trump Administration also took executive actions to undermine or delay implementation of the ACA, including directing federal agencies with authorities and responsibilities under the ACA to waive, defer, grant exemptions from, or delay the implementation of any provision of the ACA that would impose a fiscal or regulatory burden on states, individuals, healthcare providers, health insurers, or manufacturers of pharmaceuticals or medical devices. On January 28, 2021, however, President Biden issued a new executive order which directs federal agencies to reconsider rules and other policies that limit Americans’ access to health care, and consider actions that will protect and strengthen that access. Under this executive order, federal agencies are directed to re-examine: policies that undermine protections for people with pre-existing conditions, including complications related to COVID-19; demonstrations and waivers under Medicaid and the ACA that may reduce coverage or undermine the programs, including work requirements; policies that undermine the Health Insurance Marketplace or other markets for health insurance; policies that make it more difficult to enroll in Medicaid and the ACA; and policies that reduce affordability of coverage or financial assistance, including for dependents.

In addition, the CMS has proposed regulations that would give states greater flexibility in setting benchmarks for insurers in the individual and small group marketplaces, which may have the effect of relaxing the essential health benefits required under the ACA for plans sold through such marketplaces. On November 30, 2018, CMS announced a proposed rule that would amend the Medicare Advantage and Medicare Part D prescription drug benefit regulations to reduce out of pocket costs for plan enrollees and allow Medicare plans to negotiate lower rates for certain drugs. Among other things, the proposed rule changes would allow Medicare Advantage plans to use pre authorization (PA) and step therapy (ST) for six protected classes of drugs, with certain exceptions, permit plans to implement PA and ST in Medicare Part B drugs; and change the definition of “negotiated prices” while adding a definition of “price concession” in the regulations. It is unclear whether these proposed changes will be accepted, and if so, what effect such changes will have on our business.

We expect that these healthcare reforms, as well as other healthcare reform measures that may be adopted in the future, may result in additional reductions in Medicare and other healthcare funding, more rigorous coverage criteria, new payment methodologies and additional downward pressure on the price that we receive for any approved product and/or the level of reimbursement physicians receive for administering any approved product we might bring to market. Reductions in reimbursement levels may negatively impact the prices we receive or the frequency with which our products are prescribed or administered. Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors. Accordingly, such reforms, if enacted, could have an adverse effect on anticipated revenue from product candidates that we may successfully develop and for which we may obtain marketing approval and may affect our overall financial condition and ability to develop or commercialize product candidates.

The prices of prescription pharmaceuticals in the United States and foreign jurisdictions are subject to considerable legislative and executive actions and could impact the prices we obtain for our products, if and when approved.

The prices of prescription pharmaceuticals have also been the subject of considerable discussion in the United States. There have been several recent U.S. congressional inquiries, as well as proposed and enacted state and federal legislation designed to, among other things, bring more transparency to pharmaceutical pricing, review the relationship between pricing and manufacturer patient programs, and reduce the costs of pharmaceuticals under Medicare and Medicaid.

In October 2020, the Department of Health and Human Services (HHS) and the FDA published a final rule allowing states and other entities to develop a Section 804 Importation Program (SIP), to import certain prescription drugs from Canada into the United States. The final rule is currently the subject of ongoing litigation, but at least six states (Vermont, Colorado, Florida, Maine, New Mexico, and New Hampshire) have passed laws allowing for the importation of drugs from Canada with the intent of developing

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SIPs for review and approval by the FDA. Further, on November 20, 2020, HHS finalized a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to plan sponsors under Part D, either directly or through pharmacy benefit managers, unless the price reduction is required by law. The implementation of the rule was delayed by the Biden administration from January 1, 2022 to January 1, 2023 in response to ongoing litigation. The rule also creates a new safe harbor for price reductions reflected at the point-of-sale, as well as a new safe harbor for certain fixed fee arrangements between pharmacy benefit managers and manufacturers, the implementation of which have also been delayed until January 1, 2026 by the Infrastructure Investment and Jobs Act.

On July 9, 2021, President Biden signed Executive Order 14063, which focuses on, among other things, the price of pharmaceuticals. To address these costs, the executive order directs HHS to create a plan within 45 days to combat “excessive pricing of prescription drugs and enhance domestic pharmaceutical supply chains, to reduce the prices paid by the federal government for such drugs, and to address the recurrent problem of price gouging.” Thereafter, on September 9, 2021, HHS released its plan to reduce drug prices. The key features of that plan are to: (a) make drug prices more affordable and equitable for all consumers and throughout the health care system by supporting drug price negotiations with manufacturers; (b) improve and promote competition throughout the prescription drug industry by supporting market changes that strengthen supply chains, promote biosimilars and generic drugs, and increase transparency; and (c) foster scientific innovation to promote better healthcare and improve health by supporting public and private research and making sure that market incentives promote discovery of valuable and accessible new treatments.

More recently, on August 16, 2022, the Inflation Reduction Act of 2022 (IRA) was signed into law by President Biden. The new legislation has implications for Medicare Part D, which is a program available to individuals who are entitled to Medicare Part A or enrolled in Medicare Part B to give them the option of paying a monthly premium for outpatient prescription drug coverage. Among other things, the IRA requires manufacturers of certain drugs to engage in price negotiations with Medicare (beginning in 2026), with prices that can be negotiated subject to a cap; imposes rebates under Medicare Part B and Medicare Part D to penalize price increases that outpace inflation (first due in 2023); and replaces the Part D coverage gap discount program with a new discounting program (beginning in 2025). The IRA permits the Secretary of HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years.

Specifically, with respect to price negotiations, Congress authorized Medicare to negotiate lower prices for certain costly single-source drug and biologic products that do not have competing generics or biosimilars and are reimbursed under Medicare Part B and Part D. CMS may negotiate prices for ten high-cost drugs paid for by Medicare Part D starting in 2026, followed by 15 Part D drugs in 2027, 15 Part B or Part D drugs in 2028, and 20 Part B or Part D drugs in 2029 and beyond. This provision applies to drug products that have been approved for at least nine years and biologics that have been licensed for 13 years, but it does not apply to drugs and biologics that have been approved for a single rare disease or condition. Nonetheless, since CMS may establish a maximum price for these products in price negotiations, we would be fully at risk of government action if our products are the subject of Medicare price negotiations. Moreover, given the risk that could be the case, these provisions of the IRA may also further heighten the risk that we would not be able to achieve the expected return on our drug products or full value of our patents protecting our products if prices are set after such products have been on the market for nine years.

Further, the new legislation subjects drug manufacturers to civil monetary penalties and a potential excise tax for failing to comply with the legislation by offering a price that is not equal to or less than the negotiated “maximum fair price” under the law or for taking price increases that exceed inflation. The legislation also requires manufacturers to pay rebates for drugs in Medicare Part D whose price increases exceed inflation. The new law also caps Medicare out-of-pocket drug costs at an estimated $4,000 a year in 2024 and, thereafter beginning in 2025, at $2,000 a year. In addition, the IRA potentially raises legal risks with respect to individuals participating in a Medicare Part D prescription drug plan who may experience a gap in coverage if they required coverage above their initial annual coverage limit before they reached the higher threshold, or “catastrophic period” of the plan. Individuals requiring services exceeding the initial annual coverage limit and below the catastrophic period, must pay 100% of the cost of their prescriptions until they reach the catastrophic period. Among other things, the IRA contains many provisions aimed at reducing this financial burden on individuals by reducing the co-insurance and co-payment costs, expanding eligibility for lower income subsidy plans, and price caps on annual out-of-pocket expenses, each of which could have potential pricing and reporting implications.

Accordingly, while it is currently unclear how the IRA will be effectuated, we cannot predict with certainty what impact any federal or state health reforms will have on us, but such changes could impose new or more stringent regulatory requirements on our activities or result in reduced reimbursement for our products, any of which could adversely affect our business, results of operations and financial condition.

At the state level, individual states are increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. In addition, regional health care organizations and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their

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prescription drug and other health care programs. These measures could reduce the ultimate demand for our products, once approved, or put pressure on our product pricing. We expect that additional state and federal healthcare reform measures will be adopted in the future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, which could result in reduced demand for our product candidates or additional pricing pressures.

Finally, in the European Union, similar political, economic and regulatory developments may affect our ability to profitably commercialize our product candidates, if approved. In addition to continuing pressure on prices and cost containment measures, legislative developments at the European Union or member state level may result in significant additional requirements or obstacles that may increase our operating costs. The delivery of healthcare in the European Union, including the establishment and operation of health services and the pricing and reimbursement of medicines, is almost exclusively a matter for national, rather than European Union, law and policy. National governments and health service providers have different priorities and approaches to the delivery of healthcare and the pricing and reimbursement of products in that context. In general, however, the healthcare budgetary constraints in most European Union member states have resulted in restrictions on the pricing and reimbursement of medicines by relevant health service providers. Coupled with ever-increasing European Union and national regulatory burdens on those wishing to develop and market products, this could prevent or delay marketing approval of our product candidates, restrict or regulate post-approval activities and affect our ability to commercialize our product candidates, if approved.

In markets outside of the United States and the European Union, reimbursement and healthcare payment systems vary significantly by country, and many countries have instituted price ceilings on specific products and therapies. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action in the United States, the European Union or any other jurisdiction. If we or any third parties we may engage are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we or such third parties are not able to maintain regulatory compliance, our product candidates may lose any regulatory approval that may have been obtained and we may not achieve or sustain profitability.

Reporting and payment obligations under the Medicaid Drug Rebate Program and other governmental drug pricing programs are complex and may involve subjective decisions. Any failure to comply with those obligations could subject us to penalties and sanctions.

As a condition of reimbursement by various federal and state health insurance programs, pharmaceutical companies are required to calculate and report certain pricing information to federal and state agencies. The regulations governing the calculations, price reporting and payment obligations are complex and subject to interpretation by various government and regulatory agencies, as well as the courts. Reasonable assumptions have been made where there is lack of regulations or clear guidance and such assumptions involve subjective decisions and estimates. Pharmaceutical companies are required to report any revisions to our calculation, price reporting and payment obligations previously reported or paid. Such revisions could affect liability to federal and state payers and also adversely impact reported financial results of operations in the period of such restatement.

Uncertainty exists as new laws, regulations, judicial decisions, or new interpretations of existing laws, or regulations related to our calculations, price reporting or payments obligations increases the chances of a legal challenge, restatement or investigation. If a company becomes subject to investigations, restatements, or other inquiries concerning compliance with price reporting laws and regulations, it could be required to pay or be subject to additional reimbursements, penalties, sanctions or fines, which could have a material adverse effect on the business, financial condition and results of operations. In addition, it is possible that future healthcare reform measures could be adopted, which could result in increased pressure on pricing and reimbursement of products and thus have an adverse impact on financial position or business operations.

Further, state Medicaid programs may be slow to invoice pharmaceutical companies for calculated rebates resulting in a lag between the time a sale is recorded and the time the rebate is paid. This results in a company having to carry a liability on its consolidated balance sheets for the estimate of rebate claims expected for Medicaid patients. If actual claims are higher than current estimates, the company’s financial position and results of operations could be adversely affected.

In addition to retroactive rebates and the potential for 340B Program refunds, if a pharmaceutical firm is found to have knowingly submitted any false price information related to the Medicaid Drug Rebate Program to CMS, it may be liable for civil monetary penalties. Such failure could also be grounds for CMS to terminate the Medicaid drug rebate agreement, pursuant to which companies participate in the Medicaid program. In the event that CMS terminates a rebate agreement, federal payments may not be available under government programs, including Medicaid or Medicare Part B, for covered outpatient drugs.

Additionally, if a pharmaceutical company overcharges the government in connection with the Family Self-Sufficiency Program or Tricare Retail Pharmacy Program, whether due to a misstated Federal Ceiling Price or otherwise, it is required to refund the difference to the government. Failure to make necessary disclosures and/or to identify contract overcharges can result in allegations against a company under the False Claims Act and other laws and regulations. Unexpected refunds to the government, and

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responding to a government investigation or enforcement action, would be expensive and time-consuming, and could have a material adverse effect on our business, financial condition, results of operations and growth prospects.

We are subject to anti-corruption laws, as well as export control laws, customs laws, sanctions laws and other laws governing our operations. If we fail to comply with these laws, we could be subject to civil or criminal penalties, other remedial measures and legal expenses, which could adversely affect our business, results of operations and financial condition.

Our operations are subject to anti-corruption laws, including the U.S. Foreign Corrupt Practices Act (FCPA), the Irish Criminal Justice (Corruption Offenses) Act 2018, and other anti-corruption laws that apply in countries where we do business and may do business in the future. The FCPA and these other laws generally prohibit us, our officers, and our employees and intermediaries from bribing, being bribed or making other prohibited payments to government officials or other persons to obtain or retain business or gain some other business advantage. We may in the future operate in jurisdictions that pose a high risk of potential FCPA violations, and we may participate in collaborations and relationships with third parties whose actions could potentially subject us to liability under the FCPA or local anti-corruption laws. In addition, we cannot predict the nature, scope or effect of future regulatory requirements to which our international operations might be subject or the manner in that existing laws might be administered or interpreted.

Compliance with the FCPA is expensive and difficult, particularly in countries in which corruption is a recognized problem. In addition, the FCPA presents particular challenges in the pharmaceutical industry, because, in many countries, hospitals are operated by the government, and doctors and other hospital employees are considered foreign officials. Certain payments to hospitals in connection with clinical trials and other work have been deemed to be improper payments to government officials and have led to FCPA enforcement actions.

We are also subject to other laws and regulations governing our international operations, including regulations administered by the governments of the United States, and authorities in the European Union, including applicable export control regulations, economic sanctions on countries and persons, customs requirements and currency exchange regulations, collectively referred to as the trade control laws. Further, the provision of benefits or advantages to physicians to induce or encourage the prescription, recommendation, endorsement, purchase, supply, order, or use of medicinal products is prohibited in the European Union. The provision of benefits or advantages to physicians is also governed by the national anti-bribery laws of European Union member states, such as the UK Bribery Act 2010. Infringement of these laws could result in substantial fines and imprisonment. Payments made to physicians in certain European Union member states must be publicly disclosed. Moreover, agreements with physicians often must be the subject of prior notification and approval by the physician’s employer, his or her competent professional organization, and/or the regulatory authorities of the individual European Union member states. These requirements are provided in the national laws, industry codes, or professional codes of conduct applicable in the European Union member states. Failure to comply with these requirements could result in reputational risk, public reprimands, administrative penalties, fines, or imprisonment.

There is no assurance that we will be effective in ensuring our compliance with all applicable anti-corruption laws, including the FCPA or other legal requirements, including trade control laws. If we are not in compliance with the FCPA and other anti-corruption laws or trade control laws, we may be subject to criminal and civil penalties, disgorgement and other sanctions and remedial measures, and legal expenses, which could have an adverse impact on our business, financial condition, results of operations and liquidity. Likewise, any investigation of any potential violations of the FCPA, other anti-corruption laws or trade control laws by U.S. or other authorities could also have an adverse impact on our reputation, our business, results of operations and financial condition.

We are subject to various laws protecting the confidentiality of certain patient health information, and our failure to comply could result in penalties and reputational damage. Compliance with global privacy and data security requirements could result in additional costs and liabilities to us or inhibit our ability to collect and process data globally, and the failure to comply with such requirements could subject us to significant fines and penalties, which may have a material adverse effect on our business, financial condition or results of operations.

The regulatory framework for the collection, use, safeguarding, sharing, transfer and other processing of information worldwide is rapidly evolving and is likely to remain uncertain for the foreseeable future. Globally, virtually every jurisdiction in which we operate has established its own data security and privacy frameworks with which we must comply. For example, the collection, use, disclosure, transfer, or other processing of personal data regarding individuals in the European Union, including personal health data, is subject to the EU General Data Protection Regulation (GDPR), which took effect across all member states of the European Economic Area (EEA), in May 2018. The GDPR is wide-ranging in scope and imposes numerous requirements on companies that process personal data (including health and other sensitive data), including the following: to provide information to individuals regarding data processing activities; to implement safeguards to protect the security and confidentiality of personal data; to make a mandatory breach notification in certain circumstances; and to take certain measures when engaging third-party processors. The GDPR increases our obligations with respect to clinical trials conducted in the EEA by expanding the definition of personal data to include coded data and requiring changes to informed consent practices and more detailed notices for clinical trial subjects and

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investigators. In addition, the GDPR also imposes strict rules on the transfer of personal data to countries outside the European Union, including the United States and, as a result, increases the scrutiny that clinical trial sites located in the EEA should apply to transfers of personal data from such sites to countries that are considered to lack an adequate level of data protection, such as the United States. The GDPR also permits data protection authorities to require destruction of improperly gathered or used personal information and/or impose substantial fines for violations of the GDPR, which can be up to four percent of global revenues or 20 million Euros, whichever is greater. The GDPR also confers a private right of action on data subjects to lodge complaints with supervisory authorities, seek judicial remedies, and obtain compensation for damages resulting from violations of the GDPR. In addition, the GDPR provides that EU member states may make their own further laws and regulations limiting the processing of personal data, including genetic, biometric or health data adding to the complexity of processing personal data in the European Union.

In July 2020, the Court of Justice of the European Union (CJEU) invalidated the EU-U.S. Privacy Shield framework, one of the mechanisms used to legitimize the transfer of personal data from the EEA to the United States. The CJEU decision also drew into question the long-term viability of an alternative means of data transfer, the standard contractual clauses, for transfers of personal data from the EEA to the United States. Additionally, in October 2022, President Biden signed an executive order to implement the EU-U.S. Data Privacy Framework, which would serve as a replacement to the EU-US Privacy Shield. The European Commission initiated the process to adopt an adequacy decision for the EU-U.S. Data Privacy Framework in December 2022. It is unclear if and when the framework will be finalized and whether it will be challenged in court. The uncertainty around this issue may further impact our business operations in the European Union.

Similar actions are either in place or under way in the United States. There are a broad variety of data protection laws that are applicable to our activities, and a wide range of enforcement agencies at both the state and federal levels that can review companies for privacy and data security concerns based on general consumer protection laws. The Federal Trade Commission and state Attorneys General all are aggressive in reviewing privacy and data security protections for consumers. New laws also are being considered at both the state and federal levels. For example, the California Consumer Privacy Act—which went into effect on January 1, 2020—is creating similar risks and obligations as those created by GDPR, though the Act does exempt certain information collected as part of a clinical trial subject to the Federal Policy for the Protection of Human Subjects (the Common Rule). Many other states are considering similar legislation. A broad range of legislative measures also have been introduced at the federal level. Accordingly, failure to comply with federal and state laws (both those currently in effect and future legislation) regarding privacy and security of personal information could expose us to fines and penalties under such laws. There also is the threat of consumer class actions related to these laws and the overall protection of personal data. Even if we are not determined to have violated these laws, government investigations into these issues typically require the expenditure of significant resources and generate negative publicity, which could harm our reputation and our business.

Given the breadth and depth of changes in data protection obligations, complying with the GDPR’s requirements is rigorous and time intensive and requires significant resources and a review of our technologies, systems and practices, as well as those of any third-party collaborators, service providers, contractors or consultants that process or transfer personal data collected in the European Union. The GDPR and other changes in laws or regulations associated with the enhanced protection of certain types of sensitive data, such as healthcare data or other personal information from our clinical trials, could require us to change our business practices and put in place additional compliance mechanisms, may interrupt or delay our development, regulatory and commercialization activities, and could lead to government enforcement actions, private litigation and significant fines and penalties against us, all of which could increase our cost of doing business and have a material adverse effect on our business, financial condition or results of operations. Similarly, failure to comply with federal and state laws regarding privacy and security of personal information could expose us to fines and penalties under such laws. Even if we are not determined to have violated these laws, government investigations into these issues typically require the expenditure of significant resources and generate negative publicity, which could harm our reputation and our business.

Further, we cannot assure you that our third-party service providers with access to our or our customers’, suppliers’, trial patients’ and employees’ personally identifiable and other sensitive or confidential information in relation to which we are responsible will not breach contractual obligations imposed by us, or that they will not experience data security breaches or attempts thereof, which could have a corresponding effect on our business, including putting us in breach of our obligations under privacy laws and regulations and/or which could in turn adversely affect our business, results of operations and financial condition. We cannot assure you that our contractual measures and our own privacy and security-related safeguards will protect us from the risks associated with the third-party processing, storage and transmission of such information.

Our employees, independent contractors, principal investigators, CROs, consultants or vendors may engage in misconduct or other improper activities, including non-compliance with regulatory standards and requirements.

We are exposed to the risk that our employees, independent contractors, principal investigators, CROs, consultants or vendors may engage in fraudulent or other illegal activity. Misconduct by these parties could include intentional, reckless and/or negligent conduct or disclosure of unauthorized activities to us that violates FDA regulations, including those laws requiring the

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reporting of true, complete and accurate information to the FDA; manufacturing standards; federal and state healthcare fraud and abuse laws and regulations; or laws that require the true, complete and accurate reporting of financial information or data. Specifically, sales, marketing and business arrangements in the healthcare industry are subject to extensive laws and regulations intended to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs and other business arrangements. Activities subject to these laws also involve the improper use or misrepresentation of information obtained in the course of clinical trials or creating fraudulent data in our preclinical studies or clinical trials, which could result in regulatory sanctions and serious harm to our reputation. It is not always possible to identify and deter misconduct by our employees and other third parties, and the precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. Additionally, we are subject to the risk that a person could allege such fraud or other misconduct, even if none occurred. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business, including the imposition of civil, criminal and administrative penalties, damages, monetary fines, disgorgement, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs, individual imprisonment, additional reporting obligations and oversight if subject to a corporate integrity agreement or other agreement to resolve allegations of non-compliance with these laws, curtailment of our operations, contractual damages, reputational harm, and diminished potential profits and future earnings, any of which could adversely affect our business, financial condition, results of operations or growth prospects.

Risks Related to Employee Matters and Managing Growth

Our future success depends on our ability to retain our Chief Executive Officer and other key executives and to attract, retain and motivate qualified personnel.

Our industry has experienced a high rate of turnover of management personnel in recent years. We are highly dependent on the development, regulatory, commercialization and business development expertise of Corey N. Fishman, our Chief Executive Officer, as well as the other principal members of our management team. Although we have formal employment agreements with our executive officers, these agreements do not prevent them from terminating their employment with us at any time. We do not maintain “key man” insurance with respect to any of our executive officers or key employees.

If we lose one or more of our executive officers or key employees, our ability to implement our business strategy successfully could be seriously harmed. Furthermore, replacing executive officers and key employees may be difficult and may take an extended period of time because of the limited number of individuals in our industry with the breadth of skills and experience required to develop, gain regulatory approval of and commercialize product candidates successfully. Competition to hire from this limited pool is intense, and we may be unable to hire, train, retain or motivate these additional key personnel on acceptable terms given the competition among numerous pharmaceutical and biotechnology companies for similar personnel. We also experience competition for the hiring of scientific and clinical personnel from universities and research institutions. In addition, we have in the past, and may continue to do so in the future, relied on consultants and advisors, including scientific and clinical advisors, to assist us in formulating our research and development and commercialization strategy. Our consultants and advisors may be engaged by entities other than us and may have commitments under consulting or advisory contracts with other entities that may limit their availability to us. If we are unable to continue to attract and retain high quality personnel, our ability to develop and commercialize product candidates will be limited.

We may encounter difficulties in managing growth, which could disrupt our operations.

We could experience growth in the number of our employees and the scope of our operations, if we need to conduct additional clinical trials or non-clinical investigation to support the potential resubmission of our NDA or in the event we are successful in obtaining regulatory approval particularly in the areas of manufacturing, regulatory affairs, sales, marketing and health resources. Our management may need to divert a disproportionate amount of its attention away from our day-to-day activities to devote time to managing these growth activities. To manage these growth activities, we must continue to implement and improve our managerial, operational and financial systems, expand our facilities and continue to recruit and train additional qualified personnel. Due to the limited experience of our management team in managing a company with such anticipated growth, we may not be able to effectively manage the expansion of our operations or recruit and train additional qualified personnel. Our inability to effectively manage any expansion of our operations may result in weaknesses in our infrastructure, give rise to operational mistakes, loss of business opportunities, loss of employees and reduced productivity among remaining employees. Any growth experienced could require significant capital expenditures and may divert financial resources from other projects, such as the development of additional product candidates. If our management is unable to effectively manage such growth, our expenses may increase more than expected, our potential ability to generate revenue could be reduced and we may not be able to implement our business strategy.

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In addition, we have and may continue to need to adjust the size of our workforce as a result of changes to our expectations for our business, which can result in diversion of management attention, disruptions to our business, and related expenses.

If approvals are obtained outside of the United States, we will be subject to additional risks in conducting business in those markets.

Even if we are able to obtain approval for commercialization of a product candidate in a country outside of the United States, we will be subject to additional risks related to international business operations, including:

•potentially reduced protection for intellectual property rights;

•the potential for so-called parallel importing, which is what happens when a local seller, faced with high or higher local prices, opts to import goods from a market outside of the United States (with low or lower prices) rather than buying them locally;

•unexpected changes in tariffs, trade barriers and regulatory requirements;

•economic weakness, including inflation, or political instability in particular economies and markets;

•workforce uncertainty in countries where labor unrest is more common than in the United States;

•production shortages resulting from any events affecting a product candidate and/or finished drug product supply or manufacturing capabilities abroad;

•business interruptions resulting from geo-political actions, including war and terrorism, or natural disasters, including earthquakes, hurricanes, typhoons, floods and fires, public health crises, or pandemics; and

•failure to comply with Office of Foreign Asset Control rules and regulations and the FCPA.

These and other risks may materially adversely affect our ability to attain or sustain revenue from markets outside of the United States.

We may engage in acquisitions that could disrupt our business, cause dilution to our shareholders or reduce our financial resources.

In the future, we may enter into transactions to acquire other businesses, products or technologies. Any such proposed acquisitions may be subject to the consent of certain holders of the Securities in accordance with the terms and conditions of the EN Indenture and RLN Indenture. If we do identify suitable candidates for acquisition, we may not be able to make such acquisitions on favorable terms, or at all, and we may not be able to obtain approval of or consent to such acquisitions from holders of the Securities. Any acquisitions we make may not strengthen our competitive position, and these transactions may be viewed negatively by customers or investors. We may decide to incur debt in connection with an acquisition or issue our ordinary shares or other equity securities to the shareholders of the acquired company, which would reduce the percentage ownership of our then current shareholders. We could incur losses resulting from undiscovered liabilities of the acquired business that are not covered by the indemnification we may obtain from the seller. In addition, we may not be able to successfully integrate the acquired personnel, technologies and operations into our existing business in an effective, timely and non-disruptive manner. Acquisitions may also divert management attention from day-to-day responsibilities, increase our expenses and reduce our cash available for operations and other uses. We cannot predict the number, timing or size of future acquisitions or the effect that any such transactions might have on our operating results.

Risks Related to Taxation

As used in this section, Risks Related to Taxation, the term “U.S. Holder” means a beneficial owner of our ordinary shares that is, for U.S. federal income tax purposes, (1) an individual who is a citizen or resident of the United States, (2) a corporation (or entity treated as a corporation) created or organized in or under the laws of the United States, any state thereof, or the District of Columbia or otherwise treated as a “domestic corporation” for such purposes, (3) an estate the income of which is subject to U.S. federal income tax regardless of its source or (4) a trust (x) with respect to which a court within the United States is able to exercise primary supervision over its administration and one or more United States persons have the authority to control all of its substantial decisions or (y) that has elected under applicable U.S. Treasury regulations to be treated as a domestic trust. If a partnership or other pass-through entity holds our ordinary shares, the U.S. federal income tax treatment of a partner in that partnership or entity generally will depend upon the status of that partner and the activities of that partnership or entity.

We have been a passive foreign investment company for U.S. federal income tax purposes in the past and we could be a passive foreign investment company in the future, which could subject U.S. Holders to adverse U.S. federal income tax consequences.

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We were a passive foreign investment company (PFIC) for U.S. federal income tax purposes for our taxable year ended December 31, 2017. Based on our gross income and average value of our gross assets, we do not believe we (or our wholly owned non-U.S. subsidiaries) were a PFIC for the taxable year ended December 31, 2018 or for any subsequent completed taxable year. We do not expect to be a PFIC for the taxable year ending December 31, 2023; however, our status, and the status of our non-U.S. subsidiaries, in any taxable year will depend on our assets and activities as determined at various times throughout that taxable year. As our PFIC status is a factual determination made annually after the end of each taxable year, there can be no assurances as to that status for the current taxable year or any future taxable year.

We will be a PFIC in any taxable year if at least (i) 75% of our gross income is “passive income” or (ii) 50% of the average gross value of our assets, determined on a quarterly basis, is attributable to assets that produce, or are held for the production of, passive income. We refer to the passive income test as the “PFIC Income Test” and the asset test as the “PFIC Asset Test”.

If we are a PFIC in any taxable year in which a U.S. Holder holds the shares of our stock, subject to the next sentence, we always will be a PFIC with respect to those shares, regardless of the results of the PFIC Income Test or the PFIC Asset Test as applied to us in subsequent taxable years. However, under applicable Treasury regulations, if the preceding sentence applies to a U.S. Holder we will cease to be treated as a PFIC with respect to that U.S. Holder if, in the manner and at the time required by those regulations, the U.S. Holder elects to recognize (and pay tax on, in the manner described in the next paragraph) any unrealized gain in the shares of our stock owned by that U.S. Holder.

If we are a PFIC and a U.S. Holder does not make a mark-to-market election (discussed below) with respect to our ordinary shares, under the so-called “excess distribution” regime that U.S. Holder may be subject to adverse tax consequences, including deferred tax and interest charges, with respect to certain distributions on our ordinary shares, any gain realized on a disposition of our ordinary shares and certain other events. The effect of these tax consequences could be materially adverse to the shareholder. If, in any taxable year during which a U.S. Holder holds our ordinary shares and any of our non-U.S. subsidiaries is a PFIC (i.e., a lower-tier PFIC), such U.S. Holder would be treated as owning a proportionate amount (by value) of the shares of the lower-tier PFIC and would be taxed under the excess distribution regime on distributions by the lower-tier PFIC and on gain from the disposition of shares of the lower-tier PFIC even though such U.S. Holder would not receive the proceeds of those distributions or dispositions.

If a U.S. Holder makes a valid and timely mark-to-market election with respect to our ordinary shares, that U.S. Holder will recognize as ordinary income or loss in each taxable year that we meet the PFIC Income Test or PFIC Asset Test an amount equal to the difference between that U.S. Holder’s adjusted basis in our ordinary shares and the fair market value of the ordinary shares, thus also possibly giving rise to phantom income and a potential out-of-pocket tax liability. Ordinary loss generally is recognized only to the extent of net mark-to-market gains previously included in income. The mark-to-market election generally will not be available with respect to any of our subsidiaries that is a PFIC and gain recognized on the sale of our ordinary shares that is attributable to a subsidiary that is a PFIC may result in such gain being subject to deferred tax and interest charges.

In certain circumstances a U.S. Holder may make a qualified electing fund, or “QEF election,” under the U.S. federal income tax laws with respect to that holder’s interest in a PFIC. Such an election may mitigate some of the adverse U.S. federal income tax consequences that could otherwise apply to a U.S. Holder under the excess distribution regime. However, we do not expect to provide U.S. Holders with the information necessary to make a valid QEF election, and U.S. Holders should therefore assume that a QEF election will not be available.

If the IRS determines that we are not a PFIC, and a U.S. Holder previously paid taxes pursuant to a mark-to-market election, that holder may have paid more taxes than the holder legally owed.

If the U.S. Internal Revenue Service (IRS) makes a determination that we were not a PFIC in a prior taxable year and a U.S. Holder previously paid taxes pursuant to a mark-to-market election, that U.S. Holder may have paid more taxes than were legally owed due to such election. If such U.S. Holder does not, or is not able to, file a refund claim before the expiration of the applicable statute of limitations, that U.S. Holder will not be able to claim a refund for those taxes.

Changes to U.S. federal income tax laws could have material consequences for us and U.S. Holders of our ordinary shares.

Future U.S. legislation, U.S. Treasury regulations, judicial decisions and IRS rulings could affect the U.S. federal income tax treatment of us and U.S. Holders of our ordinary shares, possibly with retroactive effect.

A future transfer of a shareholder’s ordinary shares, other than one effected by means of the transfer of book entry interests in DTC, may be subject to Irish stamp duty.

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Transfers of our ordinary shares effected by means of the transfer of book entry interests in the Depository Trust Company (DTC) should not be subject to Irish stamp duty. Where the ordinary shares are traded through DTC through brokers who hold such ordinary shares on behalf of customers an exemption should be available because our ordinary shares are traded on a recognized stock exchange in the U.S. However, if a shareholder holds their ordinary shares directly rather than beneficially through DTC through a broker, any transfer of their ordinary shares could be subject to Irish stamp duty (currently at the rate of 1% of the higher of the price paid or the market value of the shares acquired). Payment of Irish stamp duty is generally a legal obligation of the transferee. The potential for stamp duty to arise could adversely affect the price of our ordinary shares.

Dividends paid by us may be subject to Irish dividend withholding tax.

We have never declared or paid cash dividends on our ordinary shares and we do not expect to pay dividends for the foreseeable future. To the extent that we do make dividend payments (or other returns to shareholders that are treated as “distributions” for Irish tax purposes), it should be noted that, in certain limited circumstances, dividend withholding tax (currently at a rate of 25%) may arise in respect of dividends paid on our ordinary shares. A number of exemptions from dividend withholding tax exist, such that shareholders resident in EU member states (other than Ireland) or other countries with which Ireland has signed a double tax treaty, which includes the United States, should generally be entitled to exemptions from dividend withholding tax provided that the appropriate documentation is in place. The ability of a U.S. Holder to credit any Irish dividend withholding tax against that U.S. Holder’s tentative U.S. federal tax liability may be subject to limitations.

Dividends received by Irish residents and certain other shareholders may be subject to Irish income tax.

We have never declared or paid cash dividends on our ordinary shares and we do not expect to pay dividends for the foreseeable future. To the extent that we do make dividend payments (or other returns to shareholders that are treated as “distributions” for Irish tax purposes), it should be noted that shareholders who are entitled to an exemption from Irish dividend withholding tax on dividends received from us will not be subject to Irish income tax in respect of those dividends, unless they have some connection with Ireland other than their shareholding in Iterum Therapeutics plc (for example, they are resident in Ireland) or they hold their ordinary shares through a branch or agency in Ireland which carries out a trade of their behalf. Shareholders who are not resident nor ordinarily resident in Ireland, but who are not entitled to an exemption from Irish dividend withholding tax, will generally have no further liability to Irish income tax on those dividends which suffer dividend withholding tax.

Our ordinary shares received by means of a gift or inheritance could be subject to Irish capital acquisitions tax.

Irish capital acquisitions tax (CAT) could apply to a gift or inheritance of our ordinary shares irrespective of the place of residence, ordinary residence or domicile of the parties. This is because our ordinary shares will be regarded as property situated in Ireland. The person who receives the gift or inheritance has primary liability for CAT.

Risks Related to Our Ordinary Shares

An active trading market for our ordinary shares may not be sustained.

Our ordinary shares began trading on the Nasdaq Global Market on May 25, 2018 and on December 23, 2020, we transferred the listing of our ordinary shares to The Nasdaq Capital Market. Given the relatively limited trading history of our ordinary shares and the intermittent volume of trading of our ordinary shares during that time, there is a risk that an active trading market for our shares may not be sustained, which could put downward pressure on the market price of our ordinary shares and thereby affect the ability of shareholders to sell their shares. An inactive trading market for our ordinary shares may also impair our ability to raise capital to continue to fund our operations by issuing shares and may impair our ability to acquire other companies or technologies by using our shares as consideration.

The price of our ordinary shares has been volatile and could be subject to volatility related or unrelated to our operations and our shareholders’ investment in us could suffer a decline in value.

Our share price has been and may continue to be volatile. The daily closing market price for our ordinary shares has varied between a high price of $6.72 on March 25, 2022, and a low price of $0.705 on December 27, 2022, in the twelve-month period ending on March 14, 2023. During this time, the price per ordinary share has ranged from an intra-day low of $0.601 per share to an intra-day high of $7.05 per share. The stock market in general and the market for biopharmaceutical companies in particular have experienced extreme volatility that has often been unrelated to the operating performance of particular companies. As a result of this volatility, investors may not be able to sell their ordinary shares at or above the price paid for the shares.

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We may continue to incur rapid and substantial increases or decreases in our stock price in the foreseeable future that may not coincide in timing with the disclosure of news or developments by or affecting us. Accordingly, the market price of our ordinary shares may fluctuate dramatically, and may decline rapidly, regardless of any developments in our business.

The trading price of our ordinary shares could be subject to wide fluctuations in response to various factors, some of which are beyond our control. The market price for our ordinary shares may be influenced by those factors discussed elsewhere in this “Risk Factors” section of this document and others, such as:

•results from, and any delays in, clinical trials;

•announcements of regulatory approval, failure to obtain regulatory approvals or receipt of a "complete response letter" from the FDA with respect to any of our product candidates;

•announcements with respect to the outcome, impact, effects or results of our evaluation of corporate, strategic, financial and financing alternatives, including the terms, timing, structure, value, benefits and costs of any corporate, strategic, financial or financing alternative and our ability to complete one at all;

•our need to raise additional funds;

•announcements relating to changes to our capital structure including a reorganization, recapitalization, share split or reverse share split, exchange of shares, or any similar equity restructuring transaction;

•the sentiment of retail investors including the perception of our clinical trial results by such retail investors, which investors may be subject to the influence of information provided by social media, third party investor websites and independent authors distributing information on the internet;

•delays in the commercialization of oral sulopenem, sulopenem or any future product candidates;

•manufacturing and supply issues related to our development programs and commercialization of oral sulopenem, sulopenem or any of our future product candidates;

•quarterly variations in our results of operations or those of our competitors;

•changes in our earnings estimates or recommendations, or withdrawal of coverage, by securities analysts;

•announcements by us or our competitors of new product candidates, significant contracts, commercial relationships, acquisitions or capital commitments;

•announcements relating to future development or license agreements including termination of such agreements;

•adverse developments with respect to our intellectual property rights or those of our principal collaborators;

•commencement of litigation involving us or our competitors;

•changes in our board of directors, management, or key scientific personnel;

•new legislation in the United States relating to the prescription, sale, distribution or pricing of drugs;

•product liability claims, other litigation or public concern about the safety of oral sulopenem, sulopenem or future products;

•failure to comply with the Nasdaq Capital Market continued listing requirements;

•market conditions in the healthcare market in general, or in the antibiotics segment in particular, including performance of our competitors;

•publication of research reports about us or our industry, or antibiotics in particular;

•changes in the market valuations of similar companies;

•sales of large blocks of our ordinary shares by our existing shareholders; and

•general economic conditions in the United States and abroad, including resulting from geo-political actions, including war and terrorism, natural disasters, including earthquakes, hurricanes, typhoons, floods and fires, public health crises, or pandemics.

In addition, the stock market in general, or the market for equity securities in our industry, may experience extreme volatility unrelated to our operating performance. In recent years, the market for pharmaceutical and biotechnology companies in particular has experienced significant price and volume fluctuations that have often been unrelated or disproportionate to changes in the operating

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performance of the companies whose shares are experiencing those price and volume fluctuations. These broad market fluctuations may adversely affect the trading price or liquidity of our ordinary shares regardless of our actual operating performance. Any sudden decline in the market price of our ordinary shares could trigger securities class-action lawsuits against us. If any of our shareholders were to bring such a lawsuit against us, we could incur substantial costs defending the lawsuit and the time and attention of our management would be diverted from our business and operations. We also could be subject to damages claims if we are found to be at fault in connection with a decline in our share price.

The volatility of our shares and shareholder base may hinder or prevent us from engaging in beneficial corporate initiatives.

Our shareholder base is comprised of a large number of retail (or non-institutional) investors, which creates more volatility since shares change hands frequently. In accordance with our governing documents and applicable laws, there are a number of initiatives that require the approval of shareholders at an annual or extraordinary general meeting of shareholders. To hold a valid meeting, a quorum comprised of one or more Members (as defined in our Amended and Restated Constitution) whose name is entered in our register of members as a registered holder of our ordinary shares, present in person or by proxy (whether or not such Member actually exercises his voting rights in whole, in part or at all), holding not less than a majority of our issued and outstanding ordinary shares entitled to vote at a meeting of shareholders, is required. A record date is established to determine which shareholders are eligible to vote at the meeting, which record date must not be more than 60 days prior to the date of the meeting. Since our shares change hands frequently, there can be a significant turnover of shareholders between the record date and the meeting date which makes it harder to get shareholders to vote. While we make every effort to engage retail investors, such efforts can be expensive and the frequent turnover creates logistical issues for obtaining shareholder approval. Further, retail investors tend to be less likely to vote in comparison to institutional investors. Failure to secure sufficient votes or to achieve the minimum quorum needed for a meeting to happen may impede our ability to move forward with initiatives that are intended to grow the business and create shareholder value or prevent us from engaging in such initiatives at all. If we find it necessary to delay or adjourn meetings or to seek approval again, it will be time consuming and we will incur additional costs.

If we fail to comply with the listing requirements of the Nasdaq Capital Market, we may be delisted and the price of our ordinary shares, our ability to access the capital markets and our financial condition could be negatively impacted and the delisting of our ordinary shares would result in an event of default and/or fundamental change under our debt instruments.

Our ordinary shares are currently listed for quotation on the Nasdaq Capital Market. To maintain the listing of our ordinary shares on the Nasdaq Capital Market, we are required to meet certain listing requirements, including, among others:

•a minimum closing bid price of $1.00 per share, and

•a market value of publicly held shares (excluding shares held by our officers, directors and 10% or more shareholders) of at least $1.0 million.

In addition to the above requirements, we must meet at least one of the following requirements:

•shareholders’ equity of at least $2.5 million; or

•a market value of listed securities of at least $35 million; or

•net income from continuing operations of $500,000.

On September 7, 2021, we received a letter from the Listing Qualifications Department of The Nasdaq Stock Market, LLC (Nasdaq), indicating that, based on the closing bid price for the previous 30 consecutive business days, the listing of our ordinary shares was not in compliance with Nasdaq Listing Rule 5550(a)(2) to maintain a minimum bid price of $1.00 per share (the Bid Price Rule). Under Nasdaq Listing Rule 5810(c)(3)(A), we were given a period of 180 calendar days, or until March 7, 2022, to regain compliance with the Bid Price Rule. Subsequently, on March 9, 2022 we were granted an additional 180-day compliance period, or until September 5, 2022, in which to regain compliance with the Bid Price Rule after meeting the continued listing requirement for market value of publicly held shares and all other initial listing standards for The Nasdaq Capital Market, with the exception of the Bid Price Rule, and providing written notice to Nasdaq of our intention to cure the deficiency during the second compliance period, by effecting a reverse share split, if necessary. At the annual general meeting of shareholders on June 15, 2022 our shareholders approved, subject to and conditional upon the board of directors determining, in its sole discretion, that a reverse share split is necessary for the Company to comply with the Bid Price Rule, a proposal to effect a reverse share split (i.e., a consolidation of share capital under Irish law), whereby every 15 ordinary shares of $0.01 (nominal value) each in the authorized and unissued and authorized and issued share capital of the Company be consolidated into 1 ordinary share of $0.15 (nominal value) each, and the subsequent (i) reduction in the nominal value of the ordinary shares in the authorized and unissued and authorized and issued share capital of the Company from $0.15 each to $0.01 each and (ii) increase in the authorized ordinary share capital of the Company in

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order to round up the authorized share capital to an even number following the reverse share split, with our board of directors able to elect to abandon such amendments and not effect the reverse share split authorized by the shareholders, in its sole discretion. On August 17, 2022, we filed an Amended and Restated Memorandum and Articles of Association with the Irish Companies Registration Office and effected, as of 5:00 p.m. Eastern Standard Time on August 17, 2022, a one-for-fifteen reverse share split of our ordinary shares. Trading of the ordinary shares on a reverse share split-adjusted basis began at the opening of trading on August 18, 2022.

On September 1, 2022, we received notification from Nasdaq that, for 10 consecutive business days from August 18, 2022 to August 31, 2022, the closing bid price of our ordinary shares was above $1.00, confirming that we had regained compliance with the Bid Price Rule.

Although we have been able to regain compliance with Nasdaq listing requirements within the manner and time periods prescribed by Nasdaq in the past, there can be no assurance that we will be able to maintain compliance with the Nasdaq Capital Market continued listing requirements in the future or regain compliance with respect to any future deficiencies. This could impair the liquidity and market price of our ordinary shares. In addition, the delisting of our ordinary shares from a national exchange could have a material adverse effect on our access to capital markets, and any limitation on market liquidity or reduction in the price of our ordinary shares as a result of that delisting could adversely affect our ability to raise capital on terms acceptable to us, or at all. The delisting of our ordinary shares from The Nasdaq Stock Market could also negatively impact our financial condition as it would constitute a fundamental change under the EN Indenture, which could trigger an obligation for us to repurchase the Exchangeable Notes at a repurchase price of 300% of the principal amount of the outstanding Exchangeable Notes.

Through the RLNs, we transferred to the holders thereof rights to receive certain payments in connection with commercial sales of sulopenem, which may reduce our ability to realize potential future revenue from such sales.

As part of a private placement which closed in January 2020 (the Private Placement) and subsequent rights offering (the Rights Offering), Iterum Bermuda issued RLNs which entitle the holders thereof to certain payments in connection with commercial sales of sulopenem. Holders of RLNs are entitled to payments based solely on a percentage of our net revenues from U.S. sales of specified sulopenem products (Specified Net Revenues). Payments will be due within 75 days of the end of each six-month payment measuring period (each, a Payment Measuring Period), beginning with the Payment Measuring Period ending June 30, 2020 until (i) the “Maximum Return” (as defined below) has been paid in respect of the RLNs, or (ii) December 31, 2045 (the End Date), or (iii) December 31, 2025, in the event that we have not yet received FDA approval with respect to one or more specified sulopenem products by such date. The aggregate amount of payments in respect of all RLNs during each Payment Measuring Period will be equal to the product of total Specified Net Revenues earned during such period and the applicable payment rate (Payment Rate), determined based on which of the specified sulopenem products have received FDA approval. The Payment Rate will be based on the maximum aggregate principal amount of RLNs and will equal (i) up to 15% if we or one of our affiliates has received FDA approval for the use of specified sulopenem products for the treatment of uUTIs and (ii) up to 20% if we or one of our affiliates has received FDA approval for the use of specified sulopenem products for the treatment of cUTIs but has not received FDA approval for treatment of uUTIs.

Prior to the End Date, Iterum Bermuda will be obligated to make payments on the RLNs from Specified Net Revenues until each RLN has received payments equal to $160.00 (or 4,000 times the principal amount of such RLN) (the Maximum Return). The principal amount of the RLNs, equal to $0.04 per RLN, is the last portion of the Maximum Return amount to which payments from Specified Net Revenue are applied. If any portion of the principal amount of the outstanding RLNs has not been paid as of the End Date, Iterum Bermuda must pay the unpaid portion of the principal amount. If Iterum Bermuda fails to pay any amounts on the RLNs that are due and payable, such defaulted amounts will accrue default interest at a rate per annum equal to the prime rate plus three percent (3.00%). Default interest will also accrue on the Principal Amount Multiple (as defined in the RLN Indenture) as a result of certain other defaults under the RLN Indenture at a rate per annum equal to four percent (4.00%).

Iterum Bermuda may at any time redeem for cash all, but not less than all, of the RLNs, at its option. The redemption price per RLN will be equal to the Maximum Return for each RLN, less payments made through and including the redemption date, plus certain accrued but unpaid default interest (if any). Upon a change of control of our company, we will require the ultimate beneficial owner or owners controlling the acquiring person or persons to guarantee the obligations of Iterum Bermuda under the RLN Indenture. In the event that a change of control occurs before we receive FDA approval with respect to one or more specified sulopenem products, the redemption price per RLN will be reduced to 50% of the Maximum Return for each RLN, less payments made through and including the redemption date, plus certain accrued but unpaid default interest (if any).

The payment obligations under the RLNs may reduce the revenue we are able to derive from commercial sales of sulopenem and a redemption of the RLNs would require us to use our cash resources, which could adversely affect the value of our company and the prices that investors are willing to pay for our ordinary shares and could adversely affect our business, financial condition and results of operations.

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If securities or industry analysts do not publish research or reports about our company, or if they issue adverse or misleading opinions regarding us or our ordinary shares, our share price and trading volume could decline.

The trading market for our ordinary shares relies, in part, on the research and reports that industry or financial analysts publish about our company. If no, or only a few, analysts publish research or reports about our company, the market price for our ordinary shares may be adversely affected. Our share price also may decline if any analyst who covers us issues an adverse or misleading opinion regarding us, our business model, our intellectual property or our share performance, or if our pivotal safety and efficacy studies and operating results fail to meet analysts’ expectations. If one or more analysts cease coverage of us or fail to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our share price or trading volume to decline and possibly adversely affect our ability to engage in future financings.

The issuance of additional ordinary shares may dilute our existing shareholders’ level of ownership in our Company or require us to relinquish rights.

Any issuance of securities we may undertake, whether in the future to raise additional capital or upon exchange or exercise of outstanding convertible securities, could cause the price of our ordinary shares to decline, or require us to issue shares at a price that is lower than that paid by holders of our ordinary shares in the past, which would result in those newly issued shares being dilutive.

In addition, the Exchangeable Notes are exchangeable for ordinary shares, cash or a combination of ordinary shares and cash, at our election, upon the terms and conditions specified therein. If we elect for physical settlement, the issuance of ordinary shares for the Exchangeable Notes may dilute the ownership percentage or voting power of our shareholders. As of December 31, 2022, $12.6 million aggregate principal amount of Exchangeable Notes remained outstanding. The outstanding warrants that we issued the purchasers and/or the designees of the placement agent and underwriter, as applicable, in connection with the June 3, 2020 Offering, the June 30, 2020 Offering, the October 2020 Offering, the February 2021 Underwritten Offering and the February 2021 Registered Direct Offering are exercisable at any time until a specified expiration date, and any exercise of outstanding warrants will increase the number of shares outstanding, which may dilute the ownership percentage or voting power of our shareholders.

Similarly, the outstanding warrants that we issued SVB and Life Sciences Fund II LLC in connection with the secured credit facility with SVB are exercisable at any time until April 27, 2028, and any exercise of such warrants will increase the number of shares outstanding, which may dilute the ownership percentage or voting power of our shareholders. Additionally, the exercise of outstanding options and vesting of restricted share units under our equity incentive plans or equity inducement incentive plan or exercise of other outstanding warrants for ordinary shares may also dilute the ownership percentage or voting power of our shareholders.

Further, if we obtain funds through the sale of equity or a debt financing or through the issuance of convertible debt or preference securities, these securities would likely have rights senior to the rights of our ordinary shareholder, which could impair the value of our ordinary shares. Any debt financing we enter into may include covenants that limit our flexibility in conducting our business. We also could be required to seek funds through arrangements with collaborators or others, which might require us to relinquish valuable rights to our intellectual property or product candidates that we would have otherwise retained.

Sales of a substantial number of our ordinary shares in the public market, or the perception that these sales could occur, could cause our share price to fall.

A substantial portion of our outstanding ordinary shares can be traded without restriction at any time. If our current shareholders sell, or indicate an intention to sell, substantial amounts of our ordinary shares in the public market, the trading price of our ordinary shares could decline.

A portion of our outstanding ordinary shares is currently restricted as a result of federal securities laws but can be sold at any time subject to applicable volume limitations.

In addition, the Exchangeable Notes are exchangeable for our ordinary shares upon the terms and conditions specified therein and a substantial portion have been exchanged for our ordinary shares. Pursuant to the investor rights agreement we entered into in connection with the Private Placement, we have filed a registration statement covering the resale of the ordinary shares issuable in connection with the exchange of the Exchangeable Notes issued as part of the Private Placement, among other securities, and the resale of the ordinary shares issuable in connection with the exchange of the Exchangeable Notes issued in connection with the Rights Offering are also covered by a registration statement. Also, in connection with our June 3, 2020 Offering and June 30, 2020 Offering, we filed a registration statement providing for the resale by the purchasers in such offerings of ordinary shares issued and issuable upon exercise of the warrants purchased in such offerings and a substantial portion of the warrants have been exercised. As a result, the shares issuable upon exchange of such notes and upon exercise of such warrants are able to be sold by the holders thereof without restrictions, subject to compliance with securities laws.

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In addition, on October 7, 2022, we entered into the Sales Agreement with HC Wainwright as agent, pursuant to which we may offer and sell ordinary shares, nominal value $0.01 per share for aggregate gross sales proceeds of up to $16.0 million, from time to time through HC Wainwright by any method permitted that is deemed to be an "at the market offering" as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended. We cannot predict if and when shares sold pursuant to the Sales Agreement, if any, will be resold in the public markets. Any of our outstanding shares that are not restricted as a result of securities laws may be resold in the public market without restriction unless purchased by our affiliates.

Furthermore, ordinary shares that are issuable upon exercise of outstanding options or reserved for future issuance under our equity incentive plans and equity inducement plan or are issuable upon exercise of our other outstanding warrants will become eligible for sale in the public market to the extent permitted by the provisions of various vesting schedules or performance criteria, and applicable securities laws. If any of these additional ordinary shares are sold, or if it is perceived that they will be sold, in the public market, the trading price of our ordinary shares could decline.

We are currently limited in our authorized share capital and an increase in authorized shares will be required for future financings or other strategic transactions.

We will need to seek the additional capital necessary to fund our operations through public or private equity offerings, debt financings, and collaborative and licensing arrangements, including through sales under the Sales Agreement with HC Wainwright. We have limited ordinary shares currently available and authorized for issuance. Investors in prior transactions have purchased our ordinary shares or our convertible securities, such as warrants and the Exchangeable Notes, for which we must reserve unissued ordinary shares. Furthermore, the warrants and Exchangeable Notes are subject to certain anti-dilution protections, including, for the outstanding Exchangeable Notes, upon the issuance of shares at a price per share less than the exchange price of the outstanding Exchangeable Notes. We therefore will likely need to increase the number of authorized ordinary shares, which requires shareholder approval, in order to issue ordinary shares or securities convertible, exercisable or exchangeable into ordinary shares to investors and other strategic partners, to utilize the full availability under the Sales Agreement and/or in other capital raising transactions. If we are unable to increase our authorized shares, we will be limited in our efforts to raise additional capital and/or could be required to settle any exchanges of our outstanding Exchangeable Notes with cash. As a result, our operations and financial condition may be materially and adversely affected.

Irish law differs from the laws in effect in the United States and may afford less protection to holders of our securities.

Shareholders may have difficulties enforcing, in actions brought in courts in jurisdictions located outside the United States, judgments obtained in the U.S. courts under the U.S. securities laws. In particular, if a shareholder sought to bring proceedings in Ireland based on U.S. securities laws, the Irish court might consider:

•that it did not have jurisdiction;

•that it was not the appropriate forum for such proceedings;

•that, applying Irish conflict of law rules, U.S. law (including U.S. securities laws) did not apply to the relationship between the shareholder and us or our directors and officers; or

•that the U.S. securities laws were of a penal nature and violated Irish public policy and should not be enforced by the Irish court.

It may not be possible to enforce court judgments obtained in the United States against us in Ireland based on the civil liability provisions of the U.S. federal or state securities laws. In addition, there is some uncertainty as to whether the courts of Ireland would recognize or enforce judgments of U.S. courts obtained against us or our directors or officers based on the civil liabilities provisions of the U.S. federal or state securities laws. We have been advised that the United States currently does not have a treaty with Ireland providing for the reciprocal recognition and enforcement of judgments in civil and commercial matters. Therefore, a final judgment for the payment of money rendered by any U.S. federal or state court based on civil liability, whether or not based solely on U.S. federal or state securities laws, would not automatically be enforceable in Ireland.

A judgment obtained against us will be enforced by the courts of Ireland only if the following general requirements are met:

•U.S. courts must have had jurisdiction in relation to the particular defendant according to Irish conflict of law rules (the submission to jurisdiction by the defendant would satisfy this rule); and

•the judgment must be final and conclusive and the decree must be final and unalterable in the court which pronounces it.

A judgment can be final and conclusive even if it is subject to appeal or even if an appeal is pending. But where the effect of lodging an appeal under the applicable law is to stay execution of the judgment, it is possible that in the meantime the judgment may

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not be actionable in Ireland. It remains to be determined whether final judgment given in default of appearance is final and conclusive. Irish courts may also refuse to enforce a judgment of the U.S. courts which meets the above requirements for one of the following reasons:

•the judgment is not for a definite sum of money;

•the judgment was obtained by fraud;

•the enforcement of the judgment in Ireland would be contrary to natural or constitutional justice;

•the judgment is contrary to Irish public policy or involves certain U.S. laws which will not be enforced in Ireland; or

•jurisdiction cannot be obtained by the Irish courts over the judgment debtors in the enforcement proceedings by personal service in Ireland or outside Ireland under Order 11 of the Irish Superior Courts Rules.

As an Irish company, we are governed by the Irish Companies Act 2014 (the Irish Companies Act), which differs in some material respects from laws generally applicable to U.S. corporations and shareholders, including, among others, differences relating to interested director and officer transactions and shareholder lawsuits. Likewise, the duties of directors and officers of an Irish company generally are owed to the company only. Shareholders of Irish companies generally do not have a personal right of action against directors or officers of the company and may exercise such rights of action on behalf of the company only in limited circumstances. Accordingly, holders of our securities may have more difficulty protecting their interests than would holders of securities of a corporation incorporated in a jurisdiction of the United States.

Our shareholders should also be aware that Irish law does not allow for any form of legal proceedings directly equivalent to the class action available in the United States.

We have incurred and will continue to incur increased costs as a result of operating as a public company, and our management is required to devote substantial time and attention to our public reporting obligations.

As a publicly-traded company, we have incurred and will continue to incur significant additional legal, accounting and other expenses compared to historical levels. In addition, new and changing laws, regulations and standards relating to corporate governance and public disclosure, including the Dodd-Frank Wall Street Reform and Consumer Protection Act and the rules and regulations promulgated and to be promulgated thereunder, as well as under the Sarbanes-Oxley Act of 2002 (the Sarbanes-Oxley Act), the Jumpstart Our Business Startups Act of 2012 (the JOBS Act) and the rules and regulations of the SEC and the Nasdaq Capital Market, have created uncertainty for public companies and increased our costs and time that our board of directors and management must devote to complying with these rules and regulations. We expect these rules and regulations to continue to increase our legal and financial compliance costs substantially and lead to diversion of management time and attention from revenue-generating activities.

We are an “emerging growth company,” and the reduced disclosure requirements applicable to “emerging growth companies” may make our ordinary shares less attractive to investors.

We are an “emerging growth company” as defined in the JOBS Act, and, therefore, we may take advantage of reduced disclosure and regulatory requirements that are otherwise generally applicable to public companies, including not being required to have our internal control over financial reporting audited by our independent registered public accounting firm pursuant to Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and any golden parachute payments. We may take advantage of these reduced disclosure and regulatory requirements until we are no longer an “emerging growth company”. We will remain an “emerging growth company” until as late as December 31, 2023 (the fiscal year-end following the fifth anniversary of our IPO). In addition, the JOBS Act provides that an emerging growth company can delay adopting new or revised accounting standards until those standards apply to private companies. We have irrevocably elected not to avail ourselves of this delayed adoption of new or revised accounting standards and, therefore, we are subject to the same new or revised accounting standards as public companies that are not emerging growth companies.

We are also a "smaller reporting company" as defined in Rule 12b-2 promulgated under the Securities Exchange Act of 1934, as amended (the Exchange Act). We may remain a smaller reporting company until we have a non-affiliate public float in excess of $250 million and annual revenues in excess of $100 million, or a non-affiliate public float in excess of $700 million, each as determined on an annual basis. Even after we no longer qualify as an "emerging growth company", we may still qualify as a smaller reporting company, which would allow us to take advantage of many of the same exemptions from disclosure requirements as those allowed for an emerging growth company.

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Investors may find our ordinary shares less attractive if we rely on certain or all of these exemptions. If some investors find our ordinary shares less attractive as a result, there may be a less active trading market for our ordinary shares and our share price may decline or become more volatile.

If we fail to maintain an effective system of disclosure controls and internal control over financial reporting, our ability to produce timely and accurate financial statements or comply with applicable regulations could be impaired.

As a public company, we are subject to the reporting requirements of the Exchange Act, the Sarbanes-Oxley Act, and the rules and regulations of the applicable listing standards of the Nasdaq Capital Market. The Sarbanes-Oxley Act requires, among other things, that we maintain effective disclosure controls and procedures and internal control over financial reporting. Our current controls and any new controls that we develop may become inadequate because of changes in conditions in our business. Further, weaknesses in our disclosure controls and internal control over financial reporting may be discovered in the future. Any failure to develop or maintain effective controls or any difficulties encountered in their implementation or improvement could harm our results of operations or cause us to fail to meet our reporting obligations and may result in a restatement of our consolidated financial statements for prior periods. Any failure to implement and maintain effective internal control over financial reporting could also adversely affect the results of periodic management evaluations and annual independent registered public accounting firm attestation reports regarding the effectiveness of our internal control over financial reporting that we will eventually be required to include in our periodic reports that will be filed with the SEC. Ineffective disclosure controls and procedures and internal control over financial reporting could also cause investors to lose confidence in our reported financial and other information, which would likely have a negative effect on the trading price of our ordinary shares. In addition, if we are unable to continue to meet these requirements, we may not be able to remain listed on the Nasdaq Capital Market.

Pursuant to Section 404 of the Sarbanes-Oxley Act, we are required to furnish a report by our management on our internal control over financial reporting. However, while we remain an emerging growth company and/or a smaller reporting company with less than $100 million in revenue, we will not be required to include an attestation report on internal control over financial reporting issued by our independent registered public accounting firm. To achieve compliance with Section 404, we engaged and continue to engage in a process to document and evaluate our internal control over financial reporting, which is both costly and challenging. In this regard, we need to continue to dedicate internal resources, potentially engage outside consultants and adopt a detailed work plan to assess and document the adequacy of internal control over financial reporting, continue steps to improve control processes as appropriate, validate through testing that controls are functioning as documented and implement a continuous reporting and improvement process for internal control over financial reporting. Despite our efforts, there is a risk that we will not be able to conclude, within the prescribed timeframe or at all, that our internal control over financial reporting is effective as required by Section 404. If we identify one or more material weaknesses, it could result in an adverse reaction in the financial markets due to a loss of confidence in the reliability of our financial statements. Additionally, we will be unable to issue securities in the public markets through the use of a shelf registration if we are not in compliance with Section 404.

Any failure to maintain effective disclosure controls and internal control over financial reporting could have a material and adverse effect on our business, results of operations and financial condition and could cause a decline in the trading price of our ordinary shares.

We have never paid cash dividends, do not anticipate paying any cash dividends and our ability to pay dividends, or repurchase or redeem our ordinary shares, is limited by law.

We have never declared or paid cash dividends on our ordinary shares and do not anticipate paying any dividends on our ordinary shares in the foreseeable future. Any determination to pay dividends in the future will be at the sole discretion of our board of directors after considering our financial condition, results of operations, capital requirements, contractual restrictions, general business conditions and other factors our board of directors deems relevant, and subject to compliance with applicable laws, including the Irish Companies Act which requires Irish companies to have distributable reserves available for distribution equal to or greater than the amount of the proposed dividend. Distributable reserves are the accumulated realized profits of the company that have not previously been utilized in a distribution or capitalization less accumulated realized losses that have not previously been written off in a reduction or reorganization of capital. Unless the company creates sufficient distributable reserves from its business activities, the creation of such distributable reserves would involve a reduction of the company’s share premium account, which would require the approval of (i) 75% of our shareholders present and voting at a shareholder meeting, and (ii) the Irish High Court. In the event that we do not undertake a reduction of capital to create distributable reserves, no distributions by way of dividends, share repurchases or otherwise will be permitted under Irish law until such time as the company has created sufficient distributable reserves from its business activities.

Accordingly, the only opportunity for a shareholder to achieve a return on their investment in our company is expected to be if the market price of our ordinary shares appreciates and they sell their ordinary shares at a profit.

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Anti-takeover provisions in our Articles of Association and under Irish law could make an acquisition of us more difficult, limit attempts by our shareholders to replace or remove our current directors and management team, and limit the market price of our ordinary shares.

Our Articles of Association contain provisions that may delay or prevent a change of control, discourage bids at a premium over the market price of our ordinary shares, and adversely affect the market price of our ordinary shares and the voting and other rights of the holders of our ordinary shares. These provisions include:

•dividing our board of directors into three classes, with each class serving a staggered three-year term;

•permitting our board of directors to adopt a shareholder rights plan upon such terms and conditions as it deems expedient and in our best interests;

•permitting our board of directors to issue preference shares, with such rights, preferences and privileges as they may designate;

•establishing an advance notice procedure for shareholder proposals to be brought before an annual meeting, including proposed nominations of persons for election to our board of directors; and

•imposing particular approval and other requirements in relation to certain business combinations.

These provisions would apply even if the offer may be considered beneficial by some shareholders. In addition, these provisions may frustrate or prevent any attempts by our shareholders to replace or remove our current management team by making it more difficult for shareholders to replace members of our board of directors, which is responsible for appointing the members of our management.

Provisions in the EN Indenture and RLN Indenture may deter or prevent a business combination that may be favorable to the holders of our ordinary shares.

If a fundamental change occurs prior to the interest record date of the Exchangeable Notes, holders of the Exchangeable Notes will have the right, at their option, to require us to repurchase for cash all or a portion of their Exchangeable Notes. The negative covenants in the EN Indenture also prohibit us from undergoing a change of control transaction, other than a transaction in which each Exchangeable Note holder receives cash consideration of at least 300% of the outstanding principal amount of its notes. Furthermore, the EN Indenture prohibits us from engaging in certain mergers or acquisitions unless, among other things, the surviving entity assumes our obligations under the Exchangeable Notes, the EN Indenture and the guarantees. In addition, the RLN Indenture prohibits us from engaging in certain mergers or acquisitions unless, among other things, the surviving entity assumes our obligations under the RLNs, the RLN Indenture and the guarantees and the RLN Indenture prohibits us from selling, transferring or assigning certain assets and prohibits Iterum Bermuda, the Guarantors or any of our significant subsidiaries from undergoing a change of control, other than in connection with a change of control of us. These and other provisions in the EN Indenture and the RLN Indenture could deter or prevent a third party from acquiring us even when the acquisition may be favorable to the holders of our ordinary shares.

Irish law differs from the laws in effect in the United States with respect to defending unwanted takeover proposals and may give our board of directors less ability to control negotiations with hostile offerors.

Following the authorization for trading of our ordinary shares on the Nasdaq Global Market on May 25, 2018, we became subject to the Irish Takeover Panel Act, 1997, Irish Takeover Rules 2013 (Irish Takeover Rules). Under the Irish Takeover Rules, our board of directors is not permitted to take any action that might frustrate an offer for our ordinary shares once our board of directors has received an approach that may lead to an offer or has reason to believe that such an offer is or may be imminent, subject to certain exceptions. Potentially frustrating actions such as (i) the issue of shares, options, restricted share units or convertible securities, (ii) material acquisitions or disposals, (iii) entering into contracts other than in the ordinary course of business or (iv) any action, other than seeking alternative offers, which may result in frustration of an offer, are prohibited during the course of an offer or at any earlier time during which our board of directors has reason to believe an offer is or may be imminent. These provisions may give our board of directors less ability to control negotiations with hostile offerors than would be the case for a corporation incorporated in a jurisdiction of the United States.

The operation of the Irish Takeover Rules may affect the ability of certain parties to acquire our ordinary shares.

Under the Irish Takeover Rules, if an acquisition of ordinary shares were to increase the aggregate holding of the acquirer and its concert parties to ordinary shares that represent 30% or more of the voting rights of the company, then the acquirer and/or, in certain circumstances, its concert parties would be required (except with the consent of the Irish Takeover Panel) to make an offer for all of the outstanding ordinary shares at a price not less than the highest price paid for the ordinary shares by the acquirer or its concert

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parties during the previous 12 months (known as a mandatory cash offer). This requirement would also be triggered by an acquisition of ordinary shares by a person holding (together with its concert parties) ordinary shares that represent between 30% and 50% of the voting rights in the company, if the effect of such acquisition was to increase that person’s percentage of the voting rights by 0.05% within any 12 month period. The EN Indenture provides that if a holder of Exchangeable Notes notifies us that they would be subject to this mandatory offer requirement, we will only issue to such holder such number of ordinary shares that can be issued without triggering a mandatory cash offer on an exchange with the remaining ordinary shares to be delivered as promptly as practicable after the holder notifies us that they would no longer be subject to a mandatory cash offer request.

Under the Irish Takeover Rules, certain separate concert parties are presumed to be acting in concert. Our board of directors and their relevant family members, related trusts and “controlled companies” are presumed to be acting in concert with any corporate shareholder who holds 20% or more of our shares. The application of these presumptions may result in restrictions upon the ability of any such concert parties and/or members of our board of directors and the other holders of the Exchangeable Notes to acquire more of our securities, including under the terms of the Exchangeable Notes and any executive incentive arrangements. We, or any such holders, may consult with the Irish Takeover Panel from time to time with respect to the application of this presumption and the restrictions on the ability to acquire further securities, although we are unable to provide any assurance as to whether the Irish Takeover Panel would overrule this presumption. Accordingly, the application of the Irish Takeover Rules may restrict the ability of certain of our shareholders and directors to acquire our ordinary shares.

As an Irish public limited company, certain capital structure decisions require shareholder approval, which may limit our flexibility to manage our capital structure.

Under Irish law, our authorized share capital can be increased by an ordinary resolution of our shareholders and the directors may issue new ordinary or preferred shares up to a maximum amount equal to the authorized but unissued share capital, without shareholder approval, once authorized to do so by our Articles of Association or by a resolution approved by not less than 50% of the votes cast at a general meeting of our shareholders. Additionally, subject to specified exceptions, Irish law grants statutory preemption rights to existing shareholders where shares are being issued for cash consideration but allows shareholders to disapply such statutory preemption rights either in our Articles of Association or by way of a resolution approved by not less than 75% of the votes cast at a general meeting of our shareholders. Such disapplication can either be generally applicable or be in respect of a particular allotment of shares. Accordingly, at an extraordinary meeting of our shareholders on January 28, 2021, our shareholders authorized the board to issue new shares, and to disapply statutory preemption rights for such issuances up to the amount of our authorized but unissued share capital until January 26, 2026. The authorization of the directors to issue shares and the disapplication of statutory preemption rights must both be renewed by the shareholders at least every five years, and we cannot provide any assurance that these authorizations will always be approved, or be approved without limitations, which could limit our ability to issue equity and thereby adversely affect the holders of our securities.

Item 1B. Unresolved Staff Comments.

Not applicable.

Item 2. Properties.

Our headquarters are located in Dublin, Ireland, where we hold a license for office space through October 2023.

In June 2018 we entered into a lease for a commercial unit in Dublin that extends through June 2038, with the option to terminate the lease in June 2028 with no penalty provided one year’s notice is given. In September 2020 we entered into a sub-lease agreement for this commercial unit in Dublin that extends through September 2023.

We also lease office space in Old Saybrook, Connecticut. Our lease extends through June 2025.

We also lease office space in Chicago, Illinois. Our lease extends through November 2023.

We believe that our current facilities are adequate to meet our near-term needs, and that suitable additional or substitute space will be available as needed on commercially reasonable terms.

Item 3. Legal Proceedings.

On August 5, 2021, a putative class action lawsuit was filed against the Company, its Chief Executive Officer and Chief Financial Officer in the United States District Court for the Northern District of Illinois. The complaint was purported to be brought on behalf of shareholders who purchased the Company's securities between November 30, 2020 and July 26, 2021. The complaint

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generally alleged that the defendants violated Section 10(b) and/or 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder by making purportedly material misstatements or omissions concerning the Company’s submission of its NDA to the FDA for marketing approval of oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen and the likelihood of such approval. The complaint sought, among other things, unspecified damages, attorneys' fees, expert fees and other costs. The court appointed a lead plaintiff and approved plaintiff’s selection of lead counsel on November 3, 2021. On January 26, 2022, plaintiff filed an amended complaint which included allegations similar to those made in the original complaint and sought similar relief. On April 8, 2022, the Company filed a motion to dismiss with the court seeking dismissal of all claims asserted. Oral argument on the motion to dismiss occurred on August 17, 2022. On December 28, 2022, the court granted the Company's motion to dismiss without prejudice giving the plaintiffs until January 24, 2023 to file an amended complaint. As no amended complaint was filed, the dismissal was converted to a dismissal with prejudice on January 25, 2023.

Item 4. Mine Safety Disclosures.

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Shareholder Matters and Issuer Purchases of Equity Securities.

Market Information

Between May 25, 2018 and December 22, 2020, our ordinary shares were publicly traded on The Nasdaq Global Market under the symbol “ITRM”. On December 23, 2020, we transferred the listing of our ordinary shares to The Nasdaq Capital Market. Prior to May 25, 2018, there was no public market for our shares.

Holders of Record

On February 28, 2023, we had 8 shareholders of record of our ordinary shares. The actual number of shareholders is greater than this number of record holders and includes shareholders who are beneficial owners, but whose shares are held in street name by brokers and other nominees.

Dividends

We have never declared or paid cash dividends on our ordinary shares and do not anticipate paying any cash dividends on our ordinary shares in the foreseeable future. Any determination to pay dividends in the future will be at the sole discretion of our board of directors after considering our financial condition, results of operations, capital requirements, contractual restrictions, general business conditions and other factors our board of directors deem relevant, and subject to compliance with applicable laws, including Irish Company law which requires Irish companies to have distributable reserves available for distribution equal to or greater than the amount of the proposed dividend.

Recent Sales of Unregistered Securities

During the period January 1, 2022 through December 31, 2022, we did not issue any equity securities that were not registered under the Securities Act of 1933, as amended, other than pursuant to transactions previously disclosed in our Current Reports on Form 8-K.

Use of Proceeds from Registered Securities

Not applicable.

Purchases of Equity Securities by the Issuer

None.

Item 6. [Reserved]

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

You should read the following discussion and analysis of our financial condition and results of operations together with our consolidated financial statements and the related notes and the other financial information included elsewhere in this Annual Report on Form 10-K. Some of the information contained in this discussion and analysis or set forth elsewhere in this Annual Report on Form 10-K, including information with respect to our plans and strategy for our business and related financing, includes forward-looking statements that involve risks and uncertainties. As a result of many factors, including those factors set forth in the “Risk Factors” section of this Annual Report on Form 10-K, our actual results could differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis. Unless otherwise stated herein, all ordinary shares, exchange rates for the Exchangeable Notes, equity awards, warrants and per share amounts have been adjusted to reflect the 1-for-15 reverse share split which became effective on August 17, 2022, for all prior periods presented.

Overview

We are a clinical stage pharmaceutical company dedicated to developing and commercializing sulopenem to be potentially the first oral branded penem available in the United States and the first and only oral and intravenous (IV) branded penem available globally. Penems, including thiopenems and carbapenems, belong to a class of antibiotics more broadly defined as ß-lactam antibiotics, the original example of which was penicillin, but which now also includes cephalosporins. Sulopenem is a potent, thiopenem antibiotic delivered intravenously which is active against bacteria that belong to the group of organisms known as gram-negatives and cause urinary tract and intra-abdominal infections. We have also developed sulopenem in an oral tablet formulation, sulopenem etzadroxil-probenecid, which we refer to herein as oral sulopenem. We believe that sulopenem and oral sulopenem have the potential to be important new treatment alternatives to address growing concerns related to antibacterial resistance without the known toxicities of some of the most widely used antibiotics, specifically fluoroquinolones.

During the third quarter of 2018, we initiated three clinical trials in our Phase 3 development program which included: a Phase 3 uncomplicated urinary tract infection (uUTI) clinical trial, known as Sulopenem for Resistant Enterobacteriaceae (SURE) 1, comparing oral sulopenem to oral ciprofloxacin in women with uUTI, a Phase 3 complicated urinary tract infection (cUTI) clinical trial known as SURE 2, comparing IV sulopenem followed by oral sulopenem to IV ertapenem followed by oral ciprofloxacin in adults with cUTI and a Phase 3 complicated intra-abdominal infection (cIAI) clinical trial known as SURE 3, comparing IV sulopenem followed by oral sulopenem to IV ertapenem followed by a combination of oral ciprofloxacin and oral metronidazole in adults with cIAI. We designed one Phase 3 clinical trial in each indication based on our end of Phase 2 meeting with the U.S. Food and Drug Administration (FDA) and feedback from the European Medicines Agency (EMA). We conducted the Phase 3 clinical trials under Special Protocol Assessment (SPA) agreements from the FDA. In December 2019, we announced that sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapy for the cIAI trial. In the second quarter of 2020, we announced the results of our Phase 3 clinical trials in cUTI and uUTI. In the cUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapies with the difference in response rates driven almost entirely by higher rates of asymptomatic bacteriuria on the sulopenem IV to oral sulopenem arm relative to the ertapenem IV to oral ciprofloxacin arm, only evident at the test of cure visit. The rates of patients receiving additional antibiotics or with residual cUTI symptoms were similar between therapies. Similarly, in the uUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to ciprofloxacin in the population of patients with baseline pathogens susceptible to ciprofloxacin driven to a large degree by a greater amount of asymptomatic bacteriuria in the sulopenem treated patients at the test of cure visit relative to those receiving ciprofloxacin. However, in the uUTI trial, in the population of patients with baseline pathogens resistant to quinolones, sulopenem achieved the related primary endpoint by demonstrating statistical significance in the overall response rate by treatment arm in the ciprofloxacin-resistant population, providing evidence of a treatment effect in patients with uUTI. Based on discussions with the FDA at a pre-New Drug Application (NDA) meeting in September 2020 and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. We received a Complete Response Letter (CRL) from the FDA on July 23, 2021 in respect of our NDA. The CRL provided that the FDA had completed its review of the NDA and had determined that it could not approve the NDA in its present form. The CRL further provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REnewed ASsessment of Sulopenem in uUTI caused by Resistant Enterobacterales (REASSURE), in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical Pharmacokinetics and Pharmacodynamics (PK/PD) studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem.

Since our inception, we have incurred significant operating losses. Our ability to generate product revenue sufficient to achieve profitability will depend heavily on the successful development and eventual commercialization of oral sulopenem and sulopenem. As

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of December 31, 2022, we had an accumulated deficit of $422.9 million. We expect to continue to incur significant expenses for the foreseeable future as we conduct additional clinical and non-clinical work to support a potential resubmission of the NDA for approval of oral sulopenem. In addition, if we obtain marketing approval for oral sulopenem, we expect to incur significant commercialization expenses related to product manufacturing, marketing, sales and distribution. We may also incur expenses in connection with the further clinical development of IV sulopenem and clinical development of sulopenem in additional indications, the establishment of additional sources for the manufacture of sulopenem tablets and, if relevant, IV vials or the in-license or acquisition of additional product candidates. Additionally, we have incurred and expect to incur additional costs associated with operating as a public company, including significant legal, accounting, investor relations and other expenses that we did not incur as a private company.

Until such time as we can obtain marketing approval for oral sulopenem, sulopenem or any future product candidate and generate significant revenue from product sales, if ever, we expect to finance our operations through a combination of equity offerings, debt financings, collaboration agreements, other third-party funding, strategic alliances, licensing arrangements, marketing and distribution arrangements or government funding. We may be unable to raise additional funds or enter into such other agreements or arrangements when needed on favorable terms, or at all. If we fail to raise capital or enter into such agreements as, and when, needed, we may have to significantly delay, scale back or discontinue the development and commercialization of our sulopenem program, or otherwise change our strategy.

Because of the numerous risks and uncertainties associated with product development, we are unable to predict the timing or amount of increased expenses or when or if we will be able to achieve or maintain profitability. Even if we are able to generate product sales, we may not become profitable. If we fail to become profitable or are unable to sustain profitability on a continuing basis, then we may be unable to continue our operations at planned levels and be forced to reduce or terminate our operations.

As of December 31, 2022, we had cash, cash equivalents and short-term investments of $60.8 million. We believe that our existing cash, cash equivalents and short-term investments as of December 31, 2022 should be sufficient to fund our operating expenses and capital expenditure requirements until mid-2024, based on our current operating plan. However, this estimate is based on assumptions that may prove to be wrong, and our operating plans may change as a result of many factors and various risks and uncertainties.

We are currently evaluating our corporate, strategic, financial and financing alternatives, with the goal of maximizing value for our stakeholders while prudently managing our remaining resources. These alternatives could potentially include the licensing, sale or divestiture of our assets or proprietary technologies, a sale of our company, a merger or other business combination or another strategic transaction involving us. The evaluation of corporate, strategic, financial and financing alternatives may not result in any particular action or any transaction being pursued, entered into or consummated, and there is no assurance as to the timing, sequence or outcome of any action or transaction or series of actions or transactions.

Components of Our Results of Operations

Operating Expenses

Research and Development Expenses

Research and development expenses consist primarily of costs incurred in connection with the development of our sulopenem program, which include:

•expenses incurred under agreements with contract research organizations (CROs), contract manufacturing organizations (CMOs), as well as investigative sites and consultants that conduct our clinical trials, preclinical studies and other scientific development services;

•manufacturing scale-up expenses and the cost of acquiring and manufacturing preclinical and clinical trial materials and commercial materials, including manufacturing validation batches;

•employee-related expenses, including salaries, related benefits, travel and share-based compensation expense for employees engaged in research and development functions;

•costs related to compliance with regulatory requirements, including the preparation and support of regulatory filings;

•facilities costs, depreciation, amortization and other expenses, which include rent under operating lease agreements and utilities; and

•payments made in cash, equity securities or other forms of consideration under third-party licensing agreements.

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We expense research and development costs as incurred. Advance payments we make for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. We recognize external development costs based on an evaluation of the progress to completion of specific tasks using information provided to us by our service providers.

The successful development and commercialization of oral sulopenem and/or sulopenem is highly uncertain. At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the clinical development of our sulopenem program or when, if ever, material net cash inflows may commence from any of our product candidates. This uncertainty is due to the numerous risks and uncertainties associated with product development and commercialization, including the uncertainty of:

•the scope, progress, outcome and costs of our clinical trials and other research and development activities;

•successful patient enrollment in, and the initiation and completion of, clinical trials;

•our ability to apply for regulatory approval, including the potential resubmission of our NDA for oral sulopenem, and the timing or likelihood of any such filings and approvals;

•the timing, receipt and terms of any marketing approvals from applicable regulatory authorities;

•establishing commercial manufacturing capabilities or making arrangements with third-party manufacturers;

•development and timely delivery of commercial drug formulations (i) that can be used in our clinical trials and (ii) that are available for commercial launch;

•obtaining, maintaining, defending and enforcing patent claims and other intellectual property rights;

•significant and changing government regulation;

•launching commercial sales of our product candidates, if and when approved, whether alone or in collaboration with others; and

•maintaining a continued acceptable safety profile of the product candidates following approval.

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We may never succeed in achieving regulatory approval for any of our product candidates. For example, in the results of our cIAI clinical trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapy for the cIAI trial. In the second quarter of 2020, we announced the results of our Phase 3 clinical trials of sulopenem for the treatment of cUTI and uUTI. In the cUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to the control therapies with the difference in response rates driven almost entirely by higher rates of asymptomatic bacteriuria on the sulopenem IV to oral sulopenem arm relative to the ertapenem IV to oral ciprofloxacin arm, only evident at the test of cure visit; the rates of patients receiving additional antibiotics or with residual cUTI symptoms were similar between therapies. Similarly, in the uUTI trial, sulopenem did not meet the primary endpoint of statistical non-inferiority compared to ciprofloxacin in the population of patients with baseline pathogens susceptible to ciprofloxacin driven to a large degree by a greater amount of asymptomatic bacteriuria in the sulopenem treated patients at the test of cure visit relative to those receiving ciprofloxacin. However, in the uUTI trial, in the population of patients with baseline pathogens resistant to quinolones, sulopenem achieved the related primary endpoint by demonstrating statistical significance in the overall response rate by treatment arm in the ciprofloxacin-resistant population, providing evidence of a treatment effect in patients with uUTI. Notwithstanding failure to meet the endpoints described above, in all three Phase 3 clinical trials, at all timepoints measured, the clinical response to sulopenem and/or oral sulopenem was similar to the comparator regimen (non-inferior), except in the instance of the quinolone non-susceptible population in the Phase 3 uUTI trial in which oral sulopenem was statistically superior. Based on discussions with the FDA at a pre-NDA meeting in September 2020 and previous correspondence with the FDA, we submitted an NDA for oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen in the fourth quarter of 2020 and the FDA accepted the application for review in January 2021. We received a CRL from the FDA on July 23, 2021, for our NDA. The CRL provided that additional data are necessary to support approval of oral sulopenem for the treatment of adult women with uUTIs caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone and recommended that we conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. In July 2022 we reached an agreement with the FDA under the SPA process on the design, endpoints and statistical analysis of a Phase 3 clinical trial for oral sulopenem for the treatment of uUTIs and we commenced enrollment in that clinical trial, known as REASSURE, in October 2022. The study is designed as a non-inferiority trial comparing oral sulopenem and Augmentin® (amoxicillin/clavulanate) in the Augmentin® susceptible population. Additionally, though not an approvability issue, the FDA recommended in its CRL that we conduct additional non-clinical PK/PD studies to support dose selection for the proposed treatment indication(s). We have completed the additional non-clinical PK/PD investigations, as recommended by the FDA, which we believe support the dosing regimen selected for oral sulopenem. There can be no assurance that we will be in a position to resolve the matters set forth in the CRL, that we will be able to complete the ongoing Phase 3 clinical trial intended to support a resubmission of our NDA or that any data generated by such clinical trial will be adequate to support resubmission or approval of our NDA.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries, related benefits and share-based compensation expense for personnel in executive, finance, market research and administrative functions. General and administrative expenses also include director compensation, travel expenses, insurance, professional fees for legal, patent, consulting, accounting and audit services, pre-commercialization activities and market preparation expenses.

Following receipt of the CRL in the third quarter of 2021, in order to reduce operating expenses and conserve cash resources, we halted any remaining pre-commercial activities for oral sulopenem and plan to limit spending to essential costs required in connection with the potential resubmission of the NDA. If and when we believe regulatory approval of oral sulopenem and/or sulopenem appears likely, we anticipate an increase in payroll and expenses as a result of our preparation for commercial operations.

Interest Expense, Net

Interest expense, net consists of interest accrued and amortization of debt costs with respect to the 6.500% Exchangeable Senior Subordinated Notes due 2025 (Exchangeable Notes) and Limited Recourse Royalty-Linked Subordinated Notes (RLNs) issued in 2020 (through January 2021), realized gains and losses on our short-term investments, interest earned on our cash and cash equivalents, which are generally invested in money market accounts, interest earned on our investments in marketable securities and interest incurred and amortization of debt costs on our loan from Silicon Valley Bank (SVB) (fully repaid in March 2022) and interest incurred on our note received under the Payment Protection Program (the PPP loan) (fully repaid in March 2022). Interest on the Exchangeable Notes is not payable until maturity of the instrument unless exchanged prior to maturity in accordance with the terms of the indenture governing the Exchangeable Notes (Exchangeable Notes Indenture) at which time any accrued and unpaid interest becomes due and payable.

Financing Transaction Costs

Financing transaction costs consist of the portion of transaction costs incurred in relation to the private placement completed in January 2020 (Private Placement) and subsequent rights offering (Rights Offering) in September 2020, in which we issued Exchangeable Notes and RLNs, allocated to derivative liabilities (the Derivative liability).

Adjustments to Fair Value of Derivatives

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Derivative liabilities are revalued at each balance sheet date and the change in fair value during the reporting period is recorded in the consolidated statements of operations as adjustments to fair value of derivatives.

Other Income, Net

Other income, net consists of realized and unrealized foreign currency gains and losses incurred in the normal course of business based on movement in the applicable exchange rates and sub-lease income from a sub-lease agreement for a commercial unit.

Provision for Income Taxes

We recognize income taxes under the asset and liability method. Deferred income taxes are recognized for differences between the financial reporting and tax bases of assets and liabilities at enacted statutory tax rates in effect for the years in which the differences are expected to reverse. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. In evaluating our ability to recover our deferred tax assets, we consider all available positive and negative evidence including past operating results, the existence of cumulative income in the most recent fiscal years, changes in the business in which we operate and our forecast of future taxable income. In determining future taxable income, we are responsible for assumptions utilized including the amount of Irish, U.S. and other foreign pre-tax operating income, the reversal of temporary differences and the implementation of feasible and prudent tax planning strategies. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates that we are using to manage the underlying business.

Valuation allowances are provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized. We account for uncertain tax positions using a more-likely-than-not threshold for recognizing and resolving uncertain tax positions. The evaluation of uncertain tax positions is based on factors including, but not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, new audit activity and changes in facts or circumstances related to a tax position. We evaluate our tax positions on a quarterly basis. We also accrue for potential interest and penalties related to unrecognized tax benefits in income tax expense.

Critical Accounting Policies and Significant Judgments and Estimates

Our consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States. The preparation of our consolidated financial statements and related disclosures requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue, costs and expenses, and the disclosure of contingent assets and liabilities in our financial statements. We base our estimates on historical experience, known trends and events and various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an ongoing basis. Our actual results may differ from these estimates under different assumptions or conditions.

While our significant accounting policies are described in more detail in Note 2 to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K, we believe that the following accounting policies are those most critical to the judgments and estimates used in the preparation of our consolidated financial statements.

Accrued Research and Development Expenses

As part of the process of preparing our consolidated financial statements, we are required to estimate our accrued research and development expenses. This process involves reviewing open contracts and purchase orders, communicating with our personnel to identify services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of actual costs. The majority of our service providers invoice us in arrears for services performed, on a pre-determined schedule or when contractual milestones are met; however, some require advanced payments. We make estimates of our accrued expenses as of each balance sheet date in the consolidated financial statements based on facts and circumstances known to us at that time. We periodically confirm the accuracy of these estimates with the service providers and make adjustments if necessary. Examples of estimated accrued research and development expenses include fees paid to:

•vendors, including central laboratories, in connection with preclinical development activities;

•CROs and investigative sites in connection with preclinical studies and clinical trials; and

•CMOs in connection with drug substance and drug product formulation of preclinical and clinical trial materials.

99

We base our expenses related to preclinical studies and clinical trials on our estimates of the services received and efforts expended pursuant to quotes and contracts with multiple research institutions and CROs that conduct and manage preclinical studies and clinical trials on our behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the expense. Payments under some of these contracts depend on factors such as the successful enrollment of patients and the completion of clinical trial milestones. In accruing service fees, we estimate the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, we adjust the accrual or the amount of prepaid expenses accordingly. Although we do not expect our estimates to be materially different from amounts actually incurred, our understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in reporting amounts that are too high or too low in any particular period. To date, there have not been any material adjustments to our prior estimates of accrued research and development expenses.

Share-Based Compensation

We measure share options and other share-based awards granted to employees and directors with service based vesting conditions only based on the fair value on the date of grant using the Black-Scholes option-pricing model. Compensation expense of those awards is recognized over the requisite service period, which is generally the vesting period of the respective award, using the straight-line method.

We measure share-based awards granted to employees and directors with both performance and service based vesting conditions based on the fair value on the date of grant using the Monte Carlo simulation model. Compensation expense of those awards is recognized over the determined vesting period, the period over which all the specified vesting conditions are to be satisfied, using the straight-line method.

For awards granted to consultants and non-employees, compensation expense is recognized over the period during which services are rendered until completed. At the end of each financial reporting period prior to completion of the service, the fair value of these awards is remeasured using the then-current fair value of our ordinary shares and updated assumption inputs in the Black-Scholes option-pricing model or the Monte Carlo simulation model.

We classify share-based compensation expense in the consolidated statement of operations and comprehensive loss in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified.

The Black-Scholes option-pricing model uses key inputs and assumptions including the expected term of the option, share price volatility, risk-free interest rate, dividend yield, share price and exercise price which is equivalent to closing market value on the date of grant. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of share-based compensation expense.

The Monte Carlo simulation model uses key inputs and assumptions including share price volatility, risk-free interest rate, the expected date of satisfaction of vesting conditions and share price. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of share-based compensation expense.

We have elected to account for forfeitures as they occur.

Derivative Liability

We account for derivative instruments in accordance with Accounting Standard Codification (ASC) 815, Derivatives and Hedging – Contracts in Entity’s Own Equity, which establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other financial instruments or contracts which require bifurcation and measurement at fair value for accounting purposes on the balance sheet date. Any liabilities recorded at fair value are revalued each reporting period with the resulting change in fair value reflected in the consolidated statements of operations as adjustments to fair value of derivatives.

In determining the appropriate fair values, we use the binomial option pricing model, and in the case of the change of control component, in combination with a discounted cash flow (DCF) analysis. Our derivative financial instruments consist of embedded features in the Exchangeable Notes. The embedded derivatives include provisions that provide the noteholder with certain exchange rights and protections on a fundamental change such as a change of control. The effects of interactions between embedded derivatives are calculated and accounted for in arriving at the overall fair value of the financial instruments.

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The binomial option-pricing model uses certain key inputs and assumptions including share price and share price volatility, the exchange rate, risk-free interest rate and dividend yield. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of the derivative liability balances.

Royalty-Linked Notes

On recognition, the RLNs qualified as debt instruments under ASC 470, Debt, and were initially recorded at fair value, applying a DCF model, and then subsequently measured at amortized cost. In January 2021, the RLNs were exchange listed, and therefore, derivative accounting has been applied in accordance with ASC 815, Derivatives and Hedging, which establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other financial instruments or contracts which require bifurcation and measurement at fair value for accounting purposes on the balance sheet date. Any liabilities recorded at fair value are revalued at each reporting period with the resulting change in fair value reflected in the consolidated statements of operations as adjustments to fair value of derivatives.

The RLN liability is carried at fair value on the consolidated balance sheets and determined using a DCF analysis. The key inputs and assumptions used in the DCF model at each reporting date include the terms of the indenture governing the RLNs, probability of regulatory approval of sulopenem, royalty payments based on estimated sales volumes and the discount rate. These assumptions require significant judgment and any changes could have a material impact in the determination of revaluation of the RLNs at each reporting date.

Results of Operations

Comparison of the Years Ended December 31, 2022 and 2021

The following table summarizes our operating loss and loss before income tax for the years ended December 31, 2022 and 2021:

	Year Ended December 31,
	2022			2021			Change
	(In thousands)
Operating expenses:
Research and development	$	(17,617	)	$	(10,712	)	$	(6,905	)
General and administrative		(12,766	)		(13,825	)		1,059
Total operating expenses	$	(30,383	)	$	(24,537	)	$	(5,846	)
Operating loss		(30,383	)		(24,537	)		(5,846	)
Total other expense		(13,750	)		(66,322	)		52,572
Loss before income taxes	$	(44,133	)	$	(90,859	)	$	46,726

Research and Development Expenses
 

	Year Ended December 31,
	2022		2021		Change
	(In thousands)
CRO and other preclinical and clinical trial expenses	$	9,374	$	2,153	$	7,221
Personnel related (including share-based compensation)		4,446		2,630		1,816
Chemistry, manufacturing and control (CMC) related expenses		2,642		2,981		(339	)
Consulting fees		1,155		2,948		(1,793	)
Total research and development expenses	$	17,617	$	10,712	$	6,905

The increase in CRO and other preclinical and clinical trial expenses of $7.2 million was primarily due to an increase in costs incurred to support our REASSURE trial, which began enrollment in October 2022. Personnel related expenses increased by $1.8 million as a result of an increase in headcount. Personnel related expenses for the years ended December 31, 2022 and 2021 included share-based compensation expense of $1.4 million and $1.3 million, respectively. CMC related expenses decreased by $0.3 million primarily due to process qualification work completed in 2021. The decrease in consulting fees of $1.8 million was primarily due to a decrease in consultants used for research and development activities in 2022. Consulting fees for the year ending December 31, 2021 primarily related to consultants used during the FDA review of our NDA for oral sulopenem.

General and Administrative Expenses

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	Year Ended December 31,
	2022		2021		Change
	(In thousands)
Personnel related (including share-based compensation)	$	6,153	$	4,870	$	1,283
Facility related and other		3,527		3,416		111
Professional and consultant fees		3,086		5,539		(2,453	)
Total general and administrative expenses	$	12,766	$	13,825	$	(1,059	)

Personnel related expenses increased by $1.3 million primarily as a result of an increase in compensation and headcount. Personnel related expenses for the years ended December 31, 2022 and 2021 included share-based compensation expense of $2.8 million and $2.7 million, respectively. Facility related and other costs increased by $0.1 million primarily as a result of an increase in directors’ fees and directors’ share-based compensation, partially offset by a reduction in rent expense. Facility related and other costs for the years ended December 31, 2022 and 2021 included directors’ share-based compensation expense of $0.6 million and $0.3 million, respectively. Professional and consulting fees decreased by $2.5 million primarily as a result of pre-commercialization activities carried out in 2021 prior to receipt of the CRL and a decrease in consultants used to support our general and administrative functions, partially offset by an increase in legal fees associated with the lawsuit filed in August 2021 which was dismissed with prejudice (case cannot be brought back to court) in January 2023.

The following table summarizes our total other expense for the years ended December 31, 2022 and 2021:

	Year Ended December 31,
	2022			2021			Change
	(In thousands)
Interest expense, net	$	(2,361	)	$	(5,553	)	$	3,192
Adjustments to fair value of derivatives		5,458			(60,964	)		66,422
Cancellation of share options		(17,350	)		—			(17,350	)
Other income, net		503			195			308
Total other expense	$	(13,750	)	$	(66,322	)	$	52,572

Interest Expense, Net

Interest expense, net decreased by $3.2 million for the year ended December 31, 2022 primarily as a result of a decrease in the amortization of the debt discounts and deferred financing costs relating to the RLNs which were listed, and therefore fully amortized, in January 2021, a decrease in interest accruing on our Exchangeable Notes and a decrease in the amortization of the debt discounts and deferred financing costs relating to them due to the reduction in the Exchangeable Notes outstanding balance and a reduction in interest expense associated with our credit facility with SVB, which was repaid in full in March 2022, and a decrease in unrealized losses on our short-term investments.

Adjustments to Fair Value of Derivatives

Adjustments to the fair value of the Derivative liability were $5.4 million and $61.0 million for the years ended December 31, 2022 and 2021, respectively. This non-cash adjustment in 2022 primarily related to a decrease in the value of derivative components associated with the Exchangeable Notes due to the decrease in our market value. This non-cash adjustment in 2021 related to an increase in the value of derivative components associated with the Exchangeable Notes that were exchanged in the first half of 2021 and an increase in the fair value of our RLNs, partially offset by a decrease in the value of the derivative components associated with the remaining Exchangeable Notes.

Cancellation of Share Options

On July 7, 2022, certain of our executive officers and employees agreed to the surrender and cancellation of certain previously granted share options in order to make available additional shares under our Amended and Restated 2018 Equity Incentive Plan. Total expense recognized in connection with the cancellation of these employee share options was $17.4 million for the year ended December 31, 2022.

Other Income, Net

Other income, net consists of realized and unrealized foreign currency gains incurred in the normal course of business based on movement in the applicable exchange rates and sub-lease income from a sub-lease agreement for a commercial unit.

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Comparison of the Years Ended December 31, 2021 and 2020

The following table summarizes our operating loss and loss before tax for the years ended December 31, 2021 and 2020:

	Year Ended December 31,
	2021			2020			Change
	(In thousands)
Operating expenses:
Research and development	$	(10,712	)	$	(21,074	)	$	10,362
General and administrative		(13,825	)		(11,052	)		(2,773	)
Total operating expenses	$	(24,537	)	$	(32,126	)	$	7,589
Operating loss		(24,537	)		(32,126	)		7,589
Total other expense		(66,322	)		(19,137	)		(47,185	)
Loss before income taxes	$	(90,859	)	$	(51,263	)	$	(39,596	)

Research and Development Expenses

	Year Ended December 31,
	2021		2020		Change
	(In thousands)
CRO and other preclinical and clinical trial expenses	$	2,153	$	9,881	$	(7,728	)
Personnel related (including share-based compensation)		2,630		4,682		(2,052	)
Chemistry, manufacturing and control (CMC) related expenses		2,981		3,031		(50	)
Consulting fees		2,948		3,480		(532	)
Total research and development expenses	$	10,712	$	21,074	$	(10,362	)

The decrease in CRO and other preclinical and clinical trial expenses of $7.7 million was primarily due to a decrease in costs incurred related to our three Phase 3 clinical trials, which were completed in 2020. Personnel related expenses decreased by $2.1 million as a result of a reduction in headcount in our CMC, clinical and regulatory functions partially offset by an increase in share-based compensation. Personnel related expenses for the years ended December 31, 2021 and 2020 included share-based compensation expense of $1.3 million and $0.8 million, respectively. CMC related expenses remained flat year over year at $3.0 million. The decrease in consulting fees of $0.5 million was primarily due to the decrease in research and development activities in 2021.

General and Administrative Expenses

	Year Ended December 31,
	2021		2020		Change
	(In thousands)
Personnel related (including share-based compensation)	$	4,870	$	5,433	$	(563	)
Facility related and other		3,416		3,141		275
Professional and consultant fees		5,539		2,478		3,061
Total general and administrative expenses	$	13,825	$	11,052	$	2,773

Personnel related expenses decreased by $0.6 million primarily as a result of a reduction in headcount in our general and administrative and commercial functions partially offset by an increase in share-based compensation. Personnel related expenses for the years ended December 31, 2021 and 2020 included share-based compensation expense of $2.7 million and $1.8 million, respectively. Facility related and other costs increased by $0.3 million primarily as a result of an increase in directors’ fees and directors’ share-based compensation. Facility related and other costs for the years ended December 31, 2021 and 2020 included directors’ share-based compensation expense of $0.3 million and $0.2 million, respectively. Professional and consulting fees increased by $3.1 million primarily as a result of an increase in consultants used for pre-commercialization activities conducted prior to receipt of the CRL in July 2021 and to support our general and administrative function.

The following table summarizes our total other expense for the years ended December 31, 2021 and 2020:

	Year Ended December 31,
	2021			2020			Change
	(In thousands)
Interest expense, net	$	(5,553	)	$	(15,097	)	$	9,544
Financing transaction costs		—			(2,848	)		2,848
Adjustments to fair value of derivatives		(60,964	)		(1,745	)		(59,219	)
Extinguishment of debt		—			340			(340	)
Other income, net		195			213			(18	)
Total other expense	$	(66,322	)	$	(19,137	)	$	(47,185	)

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Interest Expense, Net

Interest expense, net decreased by $9.5 million for the year ended December 31, 2021 primarily as a result of the decrease in interest accruing on our Exchangeable Notes of $2.1 million, a decrease in the amortization of the debt discounts and deferred financing costs relating to the Exchangeable Notes and RLNs of $6.4 million, a reduction in interest expense of $1.1 million associated with our credit facility with SVB as the outstanding balance reduced as well as an increase in interest income of $0.5 million, partially offset by an increase in unrealized losses of $0.6 million.

Financing Transaction Costs

Financing transaction costs, which include costs expensed on recognition of the Derivative liability, were $2.8 million for the year ended December 31, 2020. No such costs were expensed for the year ended December 31, 2021.

Adjustments to Fair Value of Derivatives

Adjustments to the fair value of the Derivative liability were $61.0 million and $1.7 million for the years ended December 31, 2021 and 2020, respectively. This non-cash adjustment in 2021 related to an increase in the value of derivative components associated with the Exchangeable Notes that were exchanged in the first half of 2021 and an increase in the fair value of our RLNs, partially offset by a decrease in the value of the derivative components associated with the remaining Exchangeable Notes.

Extinguishment of Debt

In November 2020, the SBA forgave $0.3 million of the $0.7 million loan we received in 2020 as part of the Coronavirus Aid, Relief, and Economic Security Act (CARES Act).

Other Income, Net

Other income, net consists of realized and unrealized foreign currency gains incurred in the normal course of business based on movement in the applicable exchange rates and sub-lease income from a sub-lease agreement for a commercial unit.

Liquidity and Capital Resources

Since our inception, we have incurred significant operating losses and negative cash flows from our operations. We have generated limited revenue to date from a funding arrangement with the Trustees of Boston University under the Combating Antibiotic Resistant Bacteria Biopharmaceutical Accelerator (CARB-X) program. We have funded our operations to date primarily through the issuance of ordinary and convertible preferred shares, warrants, debt raised under financing arrangements with SVB including the PPP loan, a sub-award from the Trustees of Boston University under the CARB-X program and the proceeds of the private placement which closed in January 2020 (the Private Placement) and the subsequent rights offering (the Rights Offering) pursuant to which our wholly owned subsidiary, Iterum Therapeutics Bermuda Limited (Iterum Bermuda), issued and sold $51.8 million aggregate principal amount of Exchangeable Notes and $0.1 million aggregate principal amount of RLNs. Through December 31, 2022, we had received cash proceeds of $198.2 million from sales of our Series A and Series B preferred shares and ordinary shares, $15.0 million from the first drawdown of our SVB loan, net proceeds of $45.0 million from the Private Placement and the Rights Offering, $0.7 million from the drawdown of our PPP loan, combined net proceeds of $8.6 million from the registered direct offering in June 2020 (June 3, 2020 Offering) and the registered direct offering in June 2020 (June 30, 2020 Offering) and $1.8 million from the exercise of warrants issued in the June 30, 2020 Offering, net proceeds of $15.5 million from the underwritten offering in October 2020 (October 2020 Offering) and $13.9 million from the exercise of warrants issued in the October 2020 Offering, net proceeds of $42.1 million from the underwritten offering in February 2021 (February 2021 Underwritten Offering) and $0.5 million from the exercise of warrants issued in the February 2021 Underwritten Offering and net proceeds of $32.2 million from the registered direct offering in February 2021 (February 2021 Registered Direct Offering).

On October 7, 2022, we filed a universal shelf registration statement on Form S-3 with the SEC, which was declared effective on October 17, 2022 (File No. 333-267795), and pursuant to which we registered for sale up to $100.0 million of any combination of debt securities, ordinary shares, preferred shares, subscription rights, purchase contracts, units and/or warrants from time to time and at prices and on terms that we may determine. On October 7, 2022, we entered into a sales agreement (the Sales Agreement), with H.C. Wainwright & Co., LLC (HC Wainwright), as agent, pursuant to which we may offer and sell ordinary shares, nominal value $0.01 per share, for aggregate gross sales proceeds of up to $16.0 million (subject to the availability of ordinary shares), from time to time through HC Wainwright by any method permitted that is deemed to be an "at the market offering" as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended. During the year ended December 31, 2022, we sold 356,933 ordinary shares under the Sales Agreement at an average price of $1.25 per share for net proceeds of $0.4 million, after deducting commissions to HC Wainwright of $0.01 million.

As of December 31, 2022, we had cash, cash equivalents and short-term investments of $60.8 million.

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Secured credit facility

On April 27, 2018, our subsidiaries, Iterum Therapeutics International Limited, Iterum Therapeutics US Holding Limited and Iterum Therapeutics US Limited (Borrowers), entered into a loan and security agreement with SVB (Loan and Security Agreement) pursuant to which SVB agreed to lend the Borrowers up to $30.0 million in two term loans. $15.0 million of the secured credit facility was funded on closing. A second draw of up to $15.0 million was available to us through October 31, 2019, upon satisfaction of either of the following: (i) the achievement by us of both non-inferiority and superiority primary endpoints from our Phase 3 uUTI trial, as well as reporting satisfactory safety data from the trial, or (ii) the achievement of non-inferiority primary endpoints from both our Phase 3 uUTI and cUTI trials, as well as reporting satisfactory safety data from the trials. We did not satisfy the conditions for the second draw above before the deadline of October 31, 2019.

Required monthly amortization payments for the initial $15.0 million draw commenced on November 1, 2019 and total principal repayments of $1,552 were made during the year ended December, 31, 2022. Interest accrued at a floating per annum rate equal to the greater of (i) 8.31%; or (ii) 3.89% above the Wall Street Journal prime rate, and was payable monthly in arrears. All outstanding principal, plus a 4.20% final interest payment, were repaid on March 1, 2022 (the maturity date), effectively terminating the Loan and Security Agreement. The final payment fee of $0.6 million which represented 4.2% of the funded loan, was accreted using the effective interest method over the life of the loan as interest expense.

In connection with the initial $15.0 million draw, we issued SVB and Life Sciences Fund II LLC (LSF) warrants to purchase an aggregate of 19,890 Series B convertible preferred shares (which converted into warrants to purchase 1,326 ordinary shares upon our IPO) at an exercise price of $282.75 per share. These warrants will expire on April 27, 2028.

In connection with the Private Placement, Iterum Bermuda was joined as a party to the Loan and Security Agreement as a borrower and the Loan and Security Agreement was amended to, among other things, modify the definition of subordinated debt to include the RLNs and Exchangeable Notes.

2025 Exchangeable Notes and Royalty-Linked Notes

On January 21, 2020, we completed the Private Placement pursuant to which our wholly owned subsidiary, Iterum Bermuda issued and sold $51.6 million aggregate principal amount of Exchangeable Notes and $0.1 million aggregate principal amount of RLNs, to a group of accredited investors. On September 8, 2020, we completed the Rights Offering pursuant to which Iterum Bermuda issued and sold $0.2 million aggregate principal amount of Exchangeable Notes and $0.04 million aggregate principal amount of RLNs, to existing shareholders. The Exchangeable Notes and RLNs were sold in Units with each Unit consisting of an Exchangeable Note in the original principal amount of $1,000 and 50 RLNs. The Units were sold at a price of $1,000 per Unit. At any time on or after January 21, 2021, subject to specified limitations, the Exchangeable Notes are exchangeable for our ordinary shares, cash or a combination of ordinary shares and cash, at an exchange rate of 87.8139 shares per $1,000 principal and interest on the Exchangeable Notes (equivalent to an exchange price of approximately $11.3877 per ordinary share) as of December 31, 2022, which exchange rate was adjusted from an initial exchange rate of 66.666 shares per $1,000 of principal and interest on the Exchangeable Notes (equivalent to an initial exchange price of approximately $15.00 per ordinary share), and is subject to further adjustment pursuant to the terms of the Exchangeable Notes Indenture. The Exchangeable Notes will mature on January 31, 2025. Beginning on January 21, 2021 to December 31, 2022, certain noteholders of $39.2 million aggregate principal amount of Exchangeable Notes have exchanged their notes for an aggregate of 3,592,555 of our ordinary shares, which included accrued and unpaid interest relating to such notes. The aggregate principal amount of Exchangeable Notes outstanding as of December 31, 2022 was $12.6 million. The RLNs entitle holders to payments based on a percentage of our net revenues from potential U.S. sales of specified sulopenem products subject to the terms and conditions of the indenture governing the RLNs (the RLN Indenture). Pursuant to the RLN Indenture, the payments on the RLNs will be up to either 15% or 20% of net revenues from U.S. sales of such products, depending on the indication approved by the FDA. The aggregate amount of payments on each RLN is capped at $160.00 (or 4,000 times the principal amount of such RLN). Iterum Bermuda received net proceeds from the sale of the Units of $45.0 million, after deducting placement agent fees and offering expenses.

Registered Direct Offerings

On June 3, 2020, we entered into the securities purchase agreement (June 3, 2020 SPA) with certain institutional investors pursuant to which we issued and sold, in the June 3, 2020 Offering, an aggregate of 198,118 ordinary shares, $0.01 nominal value per share, at a purchase price per share of $25.2375, for aggregate gross proceeds to us of $5.0 million and net proceeds of $4.3 million after deducting fees payable to the placement agent and other offering expenses payable by us. We offered the ordinary shares in the June 3, 2020 Offering pursuant to our universal shelf registration statement on Form S-3, which was declared effective on July 16, 2019 (File No. 333-232569) (the 2019 Shelf Registration Statement). Pursuant to the June 3, 2020 SPA, in a concurrent private placement, we issued and sold to the June 3 Purchasers warrants to purchase up to 99,057 ordinary shares. Upon closing, the warrants became exercisable immediately at an exercise price of $24.30 per ordinary share, subject to adjustment in certain circumstances, and will expire on December 5, 2025. The closing date of the June 3, 2020 Offering was June 5, 2020. Warrants to purchase 13,868 ordinary shares, amounting to 7% of the ordinary shares issued under the June 3, 2020 SPA, were issued to designees of the placement agent on the closing of the June 3, 2020 Offering. Upon closing, the warrants issued to such designees became exercisable immediately at an exercise price of $31.5465 per ordinary share, and will expire on June 3, 2025.

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On June 30, 2020, we entered into the securities purchase agreement (June 30, 2020 SPA) with certain institutional investors pursuant to which we issued and sold in the June 30, 2020 Offering an aggregate of 224,845 ordinary shares, $0.01 nominal value per share, at a purchase price per share of $22.2375, for aggregate gross proceeds to us of $5.0 million and net proceeds of $4.2 million after deducting fees payable to the placement agent and other offering expenses payable by us. We offered the ordinary shares in the June 30, 2020 Offering pursuant to the 2019 Shelf Registration Statement. Pursuant to the June 30, 2020 SPA, in a concurrent private placement, we issued and sold to the June 30 Purchasers warrants to purchase up to 112,422 ordinary shares. Upon closing, the warrants were exercisable immediately at an exercise price of $21.30 per ordinary share, subject to adjustment in certain circumstances, and will expire on January 2, 2026. The June 30, 2020 Offering closed on July 2, 2020. Warrants to purchase 15,739 ordinary shares, amounting to 7% of the ordinary shares issued under the June 30, 2020 SPA, were issued to designees of the placement agent on closing of the June 30, 2020 Offering. Upon closing, the warrants issued to such designees became exercisable immediately at an exercise price of $27.7965 per ordinary share, and will expire on June 30, 2025.

On February 9, 2021, we entered into the securities purchase agreement (February SPA) with certain institutional investors pursuant to which we issued and sold in the February 2021 Registered Direct Offering an aggregate of 1,166,666 ordinary shares, $0.01 nominal value per share, at a purchase price of $30.00 per share, for aggregate net proceeds to us of $32.2 million after deducting placement agent fees and other offering expenses payable by us. We offered the ordinary shares in the February 2021 Registered Direct Offering pursuant to the 2019 Shelf Registration Statement. The February 2021 Registered Direct Offering closed on February 12, 2021. Warrants to purchase 81,666 ordinary shares, amounting to 7.0% of the aggregate number of ordinary shares issued under the February SPA, were issued to designees of the placement agent on closing of the February 2021 Registered Direct Offering. Upon closing, warrants issued to such designees became exercisable immediately at an exercise price of $37.50 per ordinary share and will expire on February 9, 2026.

October Offering

On October 27, 2020, we completed the October 2020 Offering in which we sold an aggregate of (i) 1,034,102 ordinary shares, $0.01 nominal value per share, (ii) pre-funded warrants exercisable for an aggregate of 760,769 ordinary shares and (iii) warrants exercisable for an aggregate of 1,346,153 ordinary shares. The pre-funded warrants were issued and sold to certain purchasers whose purchase of ordinary shares in the October 2020 Offering would have otherwise resulted in the purchaser, together with its affiliates and certain related parties, beneficially owning more than 4.99% (or, at the election of the purchaser, 9.99%) of our outstanding ordinary shares immediately following the consummation of the October 2020 Offering, if the purchaser so chose in lieu of ordinary shares that would have otherwise resulted in such excess ownership. The ordinary shares and pre-funded warrants were each offered together with the warrants, but the ordinary shares and pre-funded warrants were issued separately from the warrants. The combined offering price was $9.75 per ordinary share and warrant and $9.60 per pre-funded warrant and warrant. Our net proceeds from the October 2020 Offering, after deducting placement agent fees and other offering expenses payable by us, were approximately $15.5 million. The warrants are exercisable upon issuance at a price of $9.75 per ordinary share, subject to adjustment in certain circumstances, and expire on October 27, 2025. The pre-funded warrants are exercisable upon issuance at a price of $0.15 per ordinary share, subject to adjustment in certain circumstances, and expire when exercised in full, subject to certain conditions. All pre-funded warrants have been exercised for net proceeds of $0.11 million. In connection with the October 2020 Offering, we entered into a Purchase Agreement on October 22, 2020 with certain institutional investors. The Purchase Agreement contains customary representations and warranties of ours, termination rights of the parties, and certain indemnification obligations of ours. Warrants to purchase 125,641 ordinary shares, which represents a number of ordinary shares equal to 7.0% of the aggregate number of ordinary shares and pre-funded warrants sold in the October 2020 Offering, were issued to designees of the placement agent on closing of the October 2020 Offering. Upon closing, the warrants issued to such designees became exercisable immediately at an exercise price of $12.1875 per ordinary share and will expire on October 22, 2025.

February 2021 Underwritten Offering

On February 3, 2021, we entered into an underwriting agreement (the Underwriting Agreement) pursuant to which we issued and sold 2,318,840 ordinary shares, $0.01 nominal value per share, at a public offering price of $17.25 per share. We offered the ordinary shares in the February 2021 Underwritten Offering pursuant to the 2019 Shelf Registration Statement. The February 2021 Underwritten Offering closed on February 8, 2021. Pursuant to the Underwriting Agreement, we granted the underwriter an option for a period of 30 days to purchase up to an additional 347,826 ordinary shares on the same terms and conditions, which the underwriter exercised in full on February 10, 2021. This increased the total number of ordinary shares we sold in the February 2021 Underwritten Offering to 2,666,666 shares, which resulted in aggregate net proceeds of $42.1 million after deducting underwriting discounts and commissions and offering expenses. In addition, pursuant to the Underwriting Agreement, we agreed to issue to the underwriter’s designees warrants to purchase 186,665 ordinary shares, which is equal to 7.0% of the aggregate number of ordinary shares sold in the February 2021 Underwritten Offering, including the underwriter’s option to purchase an additional 347,826 ordinary shares. The warrants issued to such designees of the underwriter have an exercise price of $21.5625 per ordinary share, were exercisable upon issuance and will expire on February 3, 2026.

Payment Protection Program

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In April 2020, we began deferring payment on our share of U.S. payroll taxes owed, as allowed by the CARES Act through December 31, 2020. We paid half of our share of the 2020 U.S. payroll taxes owed in December 2021, with the remaining half paid in December 2022.

On April 3, 2020, the U.S. Small Business Administration (SBA) launched the Paycheck Protection Program, which was established following the signing of the CARES Act on March 27, 2020. On April 30, 2020, our wholly owned subsidiary, Iterum Therapeutics US Limited (the Borrower), entered into the PPP loan with SVB under the Paycheck Protection Program, pursuant to the Borrower receiving a loan of $0.7 million with a fixed 1% annual interest rate and a maturity of two years. Under the terms of the agreement, there were no payments due until the earlier of the SBA remitting the forgiveness amount to the Borrower or the deferral period. Following the deferral period, equal monthly repayments of principal and interest were due to fully amortize the principal amount outstanding on the PPP loan by the maturity date. The SBA forgave $0.3 million of the loan in November 2020, and the remaining loan of $0.4 million began amortization in December 2020 with equal monthly repayments of $26 through March 2022. All outstanding amounts, including the final interest payment, were repaid on March 17, 2022, effectively terminating the PPP loan.

Cash Flows

The following table summarizes our cash flows for each of the periods presented:

	Year Ended December 31,
	2022	2021	2020
	(In thousands)
Net cash used in operating activities	$(18,473)	$(15,842)	$(54,528)
Net cash provided by / (used in) investing activities	13,957	(54,595)	(11)
Net cash (used in) / provided by financing activities	(1,818)	83,127	64,475
Effect of exchange rates on cash and cash equivalents	(50)	4	(11)
Net (decrease) / increase in cash, cash equivalents and restricted cash	$(6,384)	$12,694	$9,925

Operating Activities

During the year ended December 31, 2022, operating activities used $18.5 million of cash, resulting from our net loss of $44.4 million, partially offset by non-cash charges of $23.7 million, consisting primarily of $17.4 million of expense for the cancellation of share options, and net cash provided by changes in our operating assets and liabilities of $2.3 million. Net cash provided by changes in our operating assets and liabilities for the year ended December 31, 2022 consisted primarily of an increase in accounts payable and accrued expenses.

During the year ended December 31, 2021, operating activities used $15.8 million of cash, resulting from our net loss of $91.6 million and net cash used by changes in our operating assets and liabilities of $0.4 million, partially offset by non-cash charges of $76.2 million. Net cash used by changes in our operating assets and liabilities for the year ended December 31, 2021 consisted primarily of decreases in other liabilities and accrued expenses, offset by a decrease in prepaid expenses and other current assets, primarily due to the refund of the FDA filing fees of $2.9 million received in January 2021.

During the year ended December 31, 2020, operating activities used $54.5 million of cash, resulting from our net loss of $52.0 million and net cash used by changes in our operating assets and liabilities of $24.5 million, partially offset by non-cash charges of $19.2 million and financing transaction costs reclassified to financing activities of $2.8 million. Net cash used by changes in our operating assets and liabilities for the year ended December 31, 2020 consisted of primarily of decreases in accounts payable and accrued expenses primarily due to payments made for clinical trial expenses incurred in the fourth quarter of 2019 and lower clinical trial expenses for the year ended December 31, 2020.

Investing Activities

During the year ended December 31, 2022, net cash provided by investing activities was primarily related to sales of short-term investments of $59.7 million, partially offset by purchases of short-term investments of $45.7 million. During the year ended December 31, 2021, net cash used in investing activities was primarily related to purchases of short-term investments of $67.0 million, partially offset by sales of short-term investments of $12.5 million. During the year ended December 31, 2020, net cash used in investing activities was related to purchases of property and equipment.

Financing Activities

During the year ended December 31, 2022, net cash used in financing activities of $1.8 million was related to principal repayments made to SVB under the Loan and Security Agreement, including a final payment fee, and the PPP loan, partially offset by net proceeds from the sale of ordinary shares of $0.4 million pursuant to the Sales Agreement. During the year ended December 31, 2021, net cash provided by financing activities was $83.1 million and consisted of net cash proceeds of $42.1 million from the February Underwritten Offering, net cash proceeds of $32.2 million from the February Registered Direct Offering and $15.3 million

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from the exercise of warrants, partially offset by principal repayments of $6.5 million made to SVB under the Loan and Security Agreement and the PPP loan. During the year ended December 31, 2020, net cash provided by financing activities was $64.5 million and consisted of net cash proceeds of approximately $45.0 million from the Private Placement and the Rights Offering, net cash proceeds of $8.6 million from the June 3 and June 30 Offerings, net cash proceeds of approximately $15.5 million from the October 2020 Offering, net cash proceeds of $0.9 million from the exercise of warrants and $0.7 million from the drawdown of the PPP loan, partially offset by principal repayments of $6.2 million made to SVB under the Loan and Security Agreement.

Funding Requirements

We expect to continue to incur significant expenses and increasing operating losses as we seek potential marketing approval for oral sulopenem, resume any pre-commercialization activities and pursue the development of our sulopenem program in additional indications through preclinical and clinical development. Our expenses will also increase substantially if and as we:

•conduct additional clinical trials for oral sulopenem and/or sulopenem, which includes our REASSURE trial being conducted to support potential resubmission of our NDA for oral sulopenem;

•initiate other studies as part of our sulopenem program, some of which may be required for regulatory approval of our product candidates and/or may be conducted in response to the CRL;

•establish sales, marketing and distribution capabilities either directly or through a third-party, to commercialize oral sulopenem and/or sulopenem in the United States if we obtain marketing approval from the FDA;

•establish manufacturing and supply chain capacity sufficient to provide commercial quantities of oral sulopenem and/or sulopenem, if we obtain marketing approval and undertake commercialization activities;

•pursue the development of our sulopenem program in additional indications;

•maintain, expand, defend and protect our intellectual property portfolio;

•hire additional clinical, scientific and commercial personnel;

•add operational, financial and management information systems and personnel, including personnel to support our product development and planned future commercialization efforts; and

•acquire or in-license other product candidates or technologies.

Because of the numerous risks and uncertainties associated with research, development and commercialization of pharmaceutical product candidates, we are unable to estimate the exact amount of our working capital requirements. Our future funding requirements, both short-term and long-term, will depend on many factors, including:

•the timing and costs of our clinical trials of oral sulopenem and sulopenem, including any clinical trials or non-clinical studies which may be required for regulatory approval of our product candidates, including our REASSURE trial being conducted in response to the CRL and to support a potential resubmission of the NDA for approval of oral sulopenem;

•any other activities that may be required in connection with the potential resubmission of the NDA for oral sulopenem;

•the timing of regulatory filings including a potential resubmission of the NDA for oral sulopenem;

•the timing of regulatory review and potential approval of any product candidates, including oral sulopenem for the treatment of uUTI;

•the initiation, progress, timing, costs and results of preclinical studies and clinical trials of other potential product candidates and of our current product candidates in additional indications;

•the amount of funding that we receive under government awards that we may apply for in the future;

•the number and characteristics of product candidates that we pursue;

•the outcome, timing and costs of seeking regulatory approvals;

•the costs of commercialization activities for oral sulopenem and/or sulopenem and other product candidates if we receive marketing approval, including the costs and timing of establishing product sales, marketing, distribution and manufacturing capabilities;

•the receipt of marketing approval and revenue received from any potential commercial sales of oral sulopenem and/or sulopenem;

•the terms and timing of any future collaborations, licensing or other arrangements that we may establish;

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•the amount and timing of any payments we may be required to make, or that we may receive, in connection with the licensing, filing, prosecution, defense and enforcement of any patents or other intellectual property rights, including milestone and royalty payments and patent prosecution fees that we are obligated to pay pursuant to an exclusive license agreement with Pfizer Inc. (Pfizer) (the Pfizer License) or other future license agreements;

•the amount and timing of any payments we may be required to make in connection with the RLNs and the repayment of the Exchangeable Notes, if required;

•the costs of preparing, filing and prosecuting patent applications, maintaining and protecting our intellectual property rights and defending against any intellectual property related claims;

•the costs of operating as a public company;

•the extent to which we in-license or acquire other products and technologies; and

•the outcome, impact, effects and results of our evaluation of corporate, strategic, financial and financing alternatives, including the terms, timing, structure, value, benefits and costs of any corporate, strategic, financial or financing alternative and our ability to complete one at all.

Until such time, if ever, that we can generate product revenue sufficient to achieve profitability, we expect to finance our cash needs through a combination of public or private equity offerings, debt financings, collaboration agreements, other third-party funding, strategic alliances, licensing arrangements, marketing and distribution arrangements or government funding. To the extent that we raise additional capital through the sale of equity or convertible debt securities, our shareholders’ ownership interest will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our ordinary shareholders. Debt financing and preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. The RLNs, the Exchangeable Notes and the investor rights agreement we entered into in connection with the Private Placement each impose operating and other restrictions on us. Such restrictions affect, and in many cases limit or prohibit, our ability to dispose of certain assets, pay dividends, incur additional indebtedness, undergo a change of control and enter into certain collaborations, strategic alliances or other similar partnerships, among other things. If we raise additional funds through other third-party funding, collaboration agreements, strategic alliances, licensing arrangements or marketing and distribution arrangements, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market products or product candidates that we would otherwise prefer to develop and market ourselves. In addition, as described above, we are evaluating our corporate, strategic, financial and financing alternatives, with the goal of maximizing value for our stakeholders while prudently managing our remaining resources.

Contractual Obligations and Commitments

Under the Pfizer License, we have agreed to make certain regulatory and sales milestone payments and are obligated to make a potential one-time payment related to sublicensing income that exceeds a certain threshold. We are obligated to pay Pfizer royalties ranging from a single-digit to mid-teens percentage based on marginal net sales of each licensed product.

Under the RLN Indenture, holders of RLNs will be entitled to payments based solely on a percentage of our net revenues from U.S. sales of specified sulopenem products (Specified Net Revenues). Payments will be due within 75 days of the end of each six-month payment measuring period (Payment Measuring Period), beginning with the Payment Measuring Period ending June 30, 2020 until (i) the “Maximum Return” (as described below) has been paid in respect of the RLNs, or (ii) the “End Date” occurs, which is December 31, 2045, or (iii) December 31, 2025, in the event that we have not yet received FDA approval with respect to one or more specified sulopenem products by such date. The aggregate amount of payments in respect of all RLNs during each Payment Measuring Period will be equal to the product of total Specified Net Revenues earned during such period and the applicable payment rate (the Payment Rate), determined based on which of the specified sulopenem products have received FDA approval. The Payment Rate will be based on the maximum aggregate principal amount of RLNs and will equal (i) up to 15% if we or one of our affiliates has received FDA approval for the use of specified sulopenem products for the treatment of uUTIs and (ii) up to 20% if we or one of our affiliates has received FDA approval for the use of specified sulopenem products for the treatment of cUTIs but has not received FDA approval for treatment of uUTIs. There was no payment due for each of the Payment Measuring Periods through the payment measuring period ending December 31, 2022. Prior to the End Date, we are obligated to make payments on the RLNs from Specified Net Revenues until each RLN has received payments equal to $160.00 (or 4,000 times the principal amount of such RLN) (Maximum Return).

Our operating lease obligations primarily consist of payments for office space and commercial property, which are described further in Note 8 of our consolidated financial statements included in this Annual Report on Form 10-K. Future contractual payments

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on operating lease obligations due within one year of December 31, 2022 are $0.6 million, and future contractual payments on operating lease obligations due greater than one year from December 31, 2022 are $1.4 million.

Emerging Growth Company Status

The Jumpstart Our Business Startups Act of 2012 permits an “emerging growth company” such as us to take advantage of an extended transition period to comply with new or revised accounting standards applicable to public companies until those standards would otherwise apply to private companies. We have irrevocably elected to “opt out” of this provision and, as a result, we will comply with new or revised accounting standards when they are required to be adopted by public companies that are not emerging growth companies.

Off-Balance Sheet Arrangements

We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined in the rules and regulations of the SEC.

Recently Issued Accounting Pronouncements

A description of recently issued accounting pronouncements that may potentially impact our financial position and results of operations is disclosed in Note 2 to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

110

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

As of December 31, 2022, we had cash, cash equivalents and short-term investments of $60.8 million, consisting of cash, money market funds, commercial paper and U.S. treasury and agency bills. The primary objectives of our investment activities are to preserve principal, provide liquidity and maximize income without significantly increasing risk. We are exposed to interest rate risk in connection with our investments in marketable securities. As interest rates change, the unrealized gains and losses associated with those securities will fluctuate accordingly. An immediate interest rate increase of 100 basis points would result in a decrease of $0.1 million in the fair market value of our portfolio as of December 31, 2022. Such losses would only be realized if we sold the investments prior to maturity.

We contract with CROs and CMOs globally. We may be subject to fluctuations in foreign currency rates in connection with certain of these agreements. Transactions denominated in currencies other than the functional currency are recorded based on exchange rates at the time such transactions arise. As of December 31, 2022 and 2021, substantially all of our liabilities were denominated in U.S. dollars. Realized net foreign currency gains and losses did not have a material effect on our results of operations for the years ended December 31, 2022 and 2021. We do not currently engage in any hedging activities against our foreign currency exchange rate risk.

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Item 8. Financial Statements and Supplementary Data.

ITERUM THERAPEUTICS PLC

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm (KPMG, Dublin, Ireland, Auditor Firm ID: 1116)	113
Consolidated Balance Sheets	114
Consolidated Statements of Operations and Comprehensive Loss	115
Consolidated Statements of Shareholders’ Equity / (Deficit)	116
Consolidated Statements of Cash Flows	117
Notes to Consolidated Financial Statements	118

112

Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Directors
Iterum Therapeutics plc:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Iterum Therapeutics plc and subsidiaries (the Company) as of December 31, 2022 and 2021, the related consolidated statements of operations and comprehensive loss, shareholders’ equity/(deficit), and cash flows for each of the years in the three‑year period ended December 31, 2022, and the related notes (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2022 and 2021, and the results of its operations and its cash flows for each of the years in the three‑year period ended December 31, 2022, in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

s/ KPMG

We have served as the Company’s auditor since 2015.

Dublin, Ireland
March 16, 2023

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ITERUM THERAPEUTICS PLC

Consolidated Balance Sheets

(In thousands, except share and per share data)

	December 31,			December 31,
	2022			2021
Assets
Current assets:
Cash and cash equivalents	$	21,092		$	27,446
Short-term investments		39,712			53,898
Prepaid expenses and other current assets		1,338			1,922
Income taxes receivable		302			—
Total current assets		62,444			83,266
Intangible asset, net		1,719			3,435
Property and equipment, net		69			91
Restricted cash		34			64
Other assets		2,567			4,653
Total assets	$	66,833		$	91,509
Liabilities and Shareholders’ Equity
Current liabilities:
Accounts payable	$	2,774		$	878
Accrued expenses		4,346			1,165
Derivative liability		196			6,058
Current portion of long-term debt		—			1,627
Other current liabilities		1,748			2,992
Income taxes payable		—			221
Total current liabilities		9,064			12,941
Long-term debt, less current portion		10,094			6,930
Royalty-linked notes		18,372			17,968
Other liabilities		1,304			3,436
Total liabilities	$	38,834		$	41,275
Commitments and contingencies (Note 15)
Shareholders’ equity
Undesignated preferred shares, $0.01 par value per share: 100,000,000 shares authorized at December 31, 2022 and December 31, 2021; no shares issued at December 31, 2022 and December 31, 2021		—			—
Ordinary shares, $0.01 par value per share: 20,000,000 shares authorized at December 31, 2022 and December 31, 2021, 12,598,641 shares issued at December 31, 2022; 12,185,019 shares issued at December 31, 2021		126			122
Additional paid-in capital		451,150			428,605
Accumulated deficit		(422,927	)		(378,493	)
Accumulated other comprehensive loss		(350	)		—
Total shareholders' equity		27,999			50,234
Total liabilities and shareholders’ equity	$	66,833		$	91,509

The accompanying notes are an integral part of these consolidated financial statements.

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ITERUM THERAPEUTICS PLC

Consolidated Statements of Operations and Comprehensive Loss

(In thousands, except share and per share data)

	Year ended December 31,
	2022			2021			2020
Operating expenses:
Research and development	$	(17,617	)	$	(10,712	)	$	(21,074	)
General and administrative		(12,766	)		(13,825	)		(11,052	)
Total operating expenses		(30,383	)		(24,537	)		(32,126	)
Operating loss		(30,383	)		(24,537	)		(32,126	)
Interest expense, net		(2,361	)		(5,553	)		(15,097	)
Financing transaction costs		—			—			(2,848	)
Adjustments to fair value of derivatives		5,458			(60,964	)		(1,745	)
Cancellation of share options		(17,350	)		—			—
Extinguishment of debt		—			—			340
Other income, net		503			195			213
Total other expense		(13,750	)		(66,322	)		(19,137	)
Loss before income taxes		(44,133	)		(90,859	)		(51,263	)
Income tax expense		(301	)		(705	)		(743	)
Net loss	$	(44,434	)	$	(91,564	)	$	(52,006	)
Net loss per share – basic and diluted	$	(3.63	)	$	(8.41	)	$	(32.49	)
Weighted average ordinary shares outstanding – basic and diluted		12,236,607			10,891,178			1,600,655
Statements of Comprehensive Income
Net loss	$	(44,434	)	$	(91,564	)	$	(52,006	)
Other comprehensive loss:
Unrealized loss on marketable securities		(350	)		—			—
Comprehensive loss	$	(44,784	)	$	(91,564	)	$	(52,006	)

The accompanying notes are an integral part of these consolidated financial statements.

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ITERUM THERAPEUTICS PLC

Consolidated Statements of Shareholders’ Equity / (Deficit)

(In thousands, except share and per share data)

	Ordinary Shares				Additional
	Shares		Amount		Paid in Capital		Accumulated Deficit			Accumulated Other Comprehensive Loss			Total
Balance at December 31, 2019		991,265	$	10	$	208,675	$	(234,923	)	$	—		$	(26,238	)
Issuance of ordinary shares, net		2,304,137		23		13,309		—			—			13,332
Share-based compensation expense		—		—		2,759		—			—			2,759
Issuance of warrants for ordinary shares		—		—		11,594		—			—			11,594
Net loss		—		—		—		(52,006	)		—			(52,006	)
Balance at December 31, 2020		3,295,402	$	33	$	236,337	$	(286,929	)	$	—		$	(50,559	)
Issuance of ordinary shares, net		3,879,300		39		68,123		—			—			68,162
Share-based compensation expense		—		—		4,319		—			—			4,319
Issuance of warrants for ordinary shares		—		—		6,199		—			—			6,199
Exercise of warrants for ordinary shares		1,417,761		14		15,275		—			—			15,289
Issuance of ordinary shares on conversion of exchangeable notes		3,592,556		36		98,352		—			—			98,388
Net loss		—		—		—		(91,564	)		—			(91,564	)
Balance at December 31, 2021		12,185,019	$	122	$	428,605	$	(378,493	)	$	—		$	50,234
Issuance of ordinary shares, net		413,622		4		437		—			—			441
Share-based compensation expense		—		—		4,758		—			—			4,758
Cancellation of share options		—		—		17,350		—			—			17,350
Net loss		—		—		—		(44,434	)					(44,434	)
Unrealized loss on available-for-sale securities		—		—		—		—			(350	)		(350	)
Balance at December 31, 2022		12,598,641	$	126	$	451,150	$	(422,927	)	$	(350	)	$	27,999

The accompanying notes are an integral part of these consolidated financial statements.

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ITERUM THERAPEUTICS PLC

Consolidated Statements of Cash Flows

(In thousands, except share and per share data)

	Year ended December 31,
	2022			2021			2020
Cash flows from operating activities:
Net loss	$	(44,434	)	$	(91,564	)	$	(52,006	)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation		84			391			161
Amortization		1,716			1,713			—
Share-based compensation expense		4,758			4,319			2,759
Cancellation of share options expense		17,350			—			—
Amortization of short-term investments		(183	)		636			—
Interest on short-term investments		(55	)		(290	)		—
Amortization of debt discount and deferred financing costs		2,338			4,097			10,929
Interest on exchangeable notes - non-cash		819			1,078			3,180
Financing transaction costs included in financing activities		—			—			2,848
Adjustments to fair value of derivatives		(5,458	)		60,964			1,745
Extinguishment of debt		—			—			(340	)
Other		2,281			3,254			752
Changes in operating assets and liabilities:
Prepaid expenses and other current assets		(1,551	)		1,008			1,671
Other assets		—			(8	)		308
Accounts payable		1,895			63			(14,671	)
Accrued expenses		3,185			(662	)		(10,628	)
Income taxes		(510	)		271			(120	)
Other liabilities		(708	)		(1,112	)		(1,116	)
Net cash used in operating activities		(18,473	)		(15,842	)		(54,528	)
Cash flows from investing activities:
Purchases of property and equipment		(62	)		(61	)		(11	)
Purchases of short-term investments		(45,708	)		(67,034	)		—
Proceeds from sale of short-term investments		59,727			12,500			—
Net cash (used in) / provided by investing activities		13,957			(54,595	)		(11	)
Cash flows from financing activities:
Proceeds from PPP Loan		—			—			744
Repayments of long-term debt		(2,251	)		(6,516	)		(6,233	)
Proceeds from private placement and rights offering, net of transactions costs		—			—			45,038
Proceeds from issuance of ordinary shares, net of transaction costs		433			89,643			24,926
Net cash (used in) provided by financing activities		(1,818	)		83,127			64,475
Effect of exchange rates on cash and cash equivalents		(50	)		4			(11	)
Net increase / (decrease) in cash, cash equivalents and restricted cash		(6,384	)		12,694			9,925
Cash, cash equivalents and restricted cash, at beginning of period		27,510			14,816			4,891
Cash, cash equivalents and restricted cash, at end of period	$	21,126		$	27,510		$	14,816
Supplemental Disclosure of Cash Flow Information:
Income tax paid—U.S.	$	821		$	435		$	120
Interest paid		22			416			996

The accompanying notes are an integral part of these consolidated financial statements.

117

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

(1)Nature of Operations and Basis of Presentation

Iterum Therapeutics plc (the Company) was incorporated under the laws of the Republic of Ireland in June 2015 as a limited company and re-registered as a public limited company on March 20, 2018. The Company maintains its registered office at Fitzwilliam Court, 1st Floor, Leeson Close, Dublin 2, Ireland. The Company commenced operations in November 2015. The Company licensed global rights to its novel anti-infective compound, sulopenem, from Pfizer Inc. (Pfizer). The Company is a clinical-stage pharmaceutical company dedicated to developing and commercializing sulopenem to be potentially the first oral penem available in the United States and the first and only oral and intravenous (IV) branded penem available globally.

Since inception, the Company has devoted substantially all of its efforts to research and development, recruiting management and technical staff, and raising capital, and has financed its operations through the issuance of ordinary and convertible preferred shares, debt raised under a financing arrangement with Silicon Valley Bank (SVB) including the Paycheck Protection Program loan (PPP loan), a sub-award from the Trustees of Boston University under the Combating Antibiotic Resistant Bacteria Biopharmaceutical Accelerator (CARB-X) program and the proceeds of a private placement (Private Placement) and subsequent rights offering (Rights Offering) pursuant to which its wholly owned subsidiary, Iterum Therapeutics Bermuda Limited (Iterum Bermuda) issued and sold approximately $51.8 million aggregate principal amount of 6.500% Exchangeable Senior Subordinated Notes due 2025 (Exchangeable Notes) and $0.1 million aggregate principal amount of Limited Recourse Royalty-Linked Subordinated Notes (the RLNs and, together with the Exchangeable Notes, the Securities). The Company has not generated any product revenue. The Company is subject to risks and uncertainties common to early-stage companies in the pharmaceutical industry, including, but not limited to, the ability to secure additional capital to fund operations, failure to achieve regulatory approval, failure to successfully develop and commercialize its product candidates, development by competitors of new technological innovations, dependence on key personnel, protection of proprietary technology and compliance with government regulations. Product candidates currently under development will require additional research and development efforts, including regulatory approval prior to commercialization.

Even if the Company’s product development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales.

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and include the accounts of the Company and its subsidiaries. Certain reclassifications have been made to prior period amounts to conform with the current period's presentation, including in connection with the application of the hierarchy for fair value measurements of short-term investments, and the classification, amortised cost and unrealized gains and losses of short-term investments.

The Company's shareholders approved a reverse share split of the Company's ordinary shares on June 15, 2022, which became effective on August 17, 2022, (the Reverse Share Split). As of 5:00 p.m. Eastern Standard Time on August 17, 2022, every fifteen ordinary shares of $0.01 each (nominal value) in the authorized and unissued and authorized and issued share capital of the Company were consolidated into one ordinary share of $0.15 each (nominal value), and the nominal value of each ordinary share was subsequently reduced from $0.15 to $0.01 nominal value per share. No fractional shares were issued to any shareholders in connection with the Reverse Share Split. Shareholders who were otherwise entitled to receive a fractional ordinary share instead received a cash payment in an amount equal to the net cash proceeds attributable to the sale of such fractional entitlement following aggregation and sale by the Company on behalf of each of the relevant shareholders of the Company's ordinary shares, on the basis of prevailing market prices at such time. As the par value per share of the Company's shares remained at $0.01 per share following the Reverse Share Split, the difference between the total share capital at (par value) prior to the Reverse Share Split and the total share capital (par value) after the Reverse Share Split, has been reclassified as additional paid-in-capital on a retroactive basis. The number of ordinary shares reserved for issuance upon exercise of the Exchangeable Notes, outstanding share options and warrants or upon the vesting of outstanding restricted share units, was adjusted and proportionately decreased and the exercise price of all share options, Exchangeable Notes and warrants was proportionately increased. Additionally, the number of shares that may be the subject of future grants under our share plans was proportionally decreased. Accordingly, all historical share and per share information related to the issued and outstanding ordinary shares, the Exchangeable Notes, share options, restricted share units, warrants and shares reserved for future issuance under the Company's share plans have been adjusted to reflect the Reverse Share Split for all prior periods presented.

The Company filed a universal shelf registration statement on Form S-3 with the SEC, which was declared effective on October 17, 2022 (File No. 333-267795), and pursuant to which the Company registered for sale up to $100.0 million of any combination of debt securities, ordinary shares, preferred shares, subscription rights, purchase contracts, units and/or warrants from time to time and at prices and on terms that the Company may determine. On October 7, 2022, the Company entered into a sales agreement with H.C. Wainwright & Co., LLC (HC Wainwright), as agent, pursuant to which the Company may offer and sell ordinary shares, nominal value $0.01 per share, for aggregate gross sales proceeds of up to $16.0 million (subject to the availability of ordinary shares), from time to time through HC Wainwright by any method permitted that is deemed to be an "at the market offering" as defined in Rule 415 (a)(4) promulgated under the Securities Act of 1933, as amended.

118

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

In accordance with Accounting Standards Update (ASU) 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (Subtopic 205-40), the Company has evaluated whether there are conditions and events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year of the date of issue of the consolidated financial statements.

The Company has funded its operations to date primarily with proceeds from the sale of preferred shares and ordinary shares, warrants, debt raised under its financing arrangement with SVB including the PPP loan (both of which have been repaid), payments received under the CARB-X program and proceeds of the Private Placement and Rights Offering. The Company has incurred operating losses since inception, including net losses of $44,434, $91,564 and $52,006 for the years ended December 31, 2022, 2021 and 2020, respectively. The Company had an accumulated deficit of $422,927 as of December 31, 2022 and expects to continue to incur net losses for the foreseeable future. Management believes that its cash and cash equivalents balance of $21,092 and short-term investments of $39,712 at December 31, 2022 are sufficient to fund operations until mid-2024. In making this assessment management have considered the planned operations of the company and the ability to adjust its plans if required.

In addition, in parallel, the Company is evaluating its corporate, strategic, financial and financing alternatives, with the goal of maximizing value for its stakeholders. These alternatives could potentially include the licensing, sale or divestiture of the Company’s assets or proprietary technologies, a sale of the Company, a merger or other business combination or another strategic transaction involving the Company. The evaluation of corporate, strategic, financial and financing alternatives may not result in any particular action or any transaction being pursued, entered into or consummated, and there is no assurance as to the timing, sequence or outcome of any action or transaction or series of actions or transactions.

(2)Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, the valuation of share-based compensation awards, the valuation of the RLNs and the Derivative liabilities, which consist of embedded features in the Exchangeable Notes, and the accrual for research and development expenses. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates as there are changes in circumstances, facts and experience. Actual results could differ materially from those estimates.

Specifically, management has estimated variables used to calculate the discounted cash flow analysis (DCF) and assumptions used in the binomial option pricing model to value derivative instruments (see Note 3 – Fair Value of Financial Assets and Liabilities).

Comprehensive Loss

Comprehensive loss includes net loss as well as other changes in stockholders’ equity that result from transactions and economic events other than those with shareholders. For the year ended December 31, 2022, these changes related to unrealized gains and losses on the Company’s available-for-sale short-term investments. For the year ended December 31, 2021, there was no difference between net loss and comprehensive loss. There were no reclassifications out of comprehensive loss for the years ended December 31, 2022 and 2021.

Consolidation

The accompanying consolidated financial statements include the accounts of Iterum Therapeutics plc and its wholly owned subsidiaries (which are referred to herein, collectively, as the Company where context requires). All significant intercompany balances and transactions have been eliminated on consolidation. The Company has no involvement with variable interest entities.

Short-term Investments

The Company's investments consist primarily of debt securities, including investment-grade corporate bonds. The Company considers its portfolio of investments to be available-for-sale. Accordingly, these investments are recorded at fair value, which is based on quoted market prices. Investments with maturities beyond one year are generally classified as short term, based on their highly liquid nature and because such marketable securities represent the investment of cash that is available for current operations. Unrealized gains and losses are reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity.

119

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

Realized gains and losses and declines in value are included as a component of other income (expense), net based on the specific identification method. Any credit impairments are recorded through an allowance account.

Cash and Cash Equivalents

The Company’s cash and cash equivalents consist of cash balances and highly liquid investments with maturities of three months or less at the date of purchase. Accounts held at U.S. financial institutions are insured by the Federal Deposit Insurance Corporation (FDIC) up to $250, while accounts held at Irish financial institutions are insured under the Deposit Guarantee Scheme up to $107 (€100).

Cash accounts with any type of restriction are classified as restricted cash. If restrictions are expected to be lifted in the next twelve months, the restricted cash account is classified as current. Included within restricted cash on the Company’s consolidated balance sheet is $17 and $17 for the years ended December 31, 2022 and 2021, respectively, relating to the warrants issued on June 5, 2020 pursuant to the securities purchase agreement (June 3, 2020 SPA) in the June 3, 2020 registered direct offering (June 3, 2020 Offering), $6 and $6 for the years ended December 31, 2022 and 2021, respectively, relating to the warrants issued on July 2, 2020 pursuant to the securities purchase agreement (June 30, 2020 SPA) in the June 30, 2020 registered direct offering (June 30, 2020 Offering) and $11 and $11 for the years ended December 31, 2022 and 2021, respectively, relating to warrants issued in the underwritten offering in October 2020 (October 2020 Offering). On the closing date of each of the registered direct offerings in June 2020 (June 3 Offering) and July 2020 (June 30 Offering) and the underwritten offering in the October 2020 Offering, each investor deposited $0.01 per warrant issued being the nominal value of the underlying ordinary share represented by each warrant. This amount will be held in trust by the Company pending a decision by the relevant investor to exercise the warrant by means of a “cashless exercise” pursuant to the terms of the warrant, in which case the $0.01 will be used to pay up the nominal value of the ordinary share issued pursuant to the warrant. Upon the exercise of the warrants other than by means of a "cashless exercise", the amount held in trust will be returned to the relevant investor in accordance with the terms of the applicable purchase agreement or prospectus. Also included within restricted cash on the Company’s consolidated balance sheet is a certificate of deposit for $30 for the year ended December 31, 2021, which was being held by a third party bank as collateral for the irrevocable letter of credit issued in March 2018 to secure an office lease (see Note 8 – Leases).

Foreign Currencies

Items included in the consolidated financial statements are measured using the currency of the primary economic environment in which the entity operates (functional currency). The consolidated financial statements are presented in U.S. dollars.

Transactions in foreign currencies are recorded at the rate of exchange at the date of the transaction. Monetary assets and liabilities denominated in foreign currencies at the balance sheet date are retranslated into the functional currency at the rate of exchange at the balance sheet date, and the resulting gains and losses are recognized in the consolidated statement of operations and comprehensive loss. Non-monetary items in a foreign currency that are measured in terms of historical cost are translated using the exchange rate at the date of transaction.

Intangible Assets

The Company’s finite-lived intangible asset is stated at cost less accumulated amortization. The Company calculates amortization expense using the straight-line method over the estimated useful life of the related asset which the Company believes reasonably represents the time period in which the economic benefit of the intangible asset is consumed or otherwise realized. The Company reviews the recoverability of the finite-lived intangible asset and, when there are indications that this asset is more likely than not to have become impaired, will test for impairment.

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation. Property and equipment are depreciated using the straight-line method over the estimated useful life of each asset as follows:

	Estimated Useful Life
Leasehold improvements	Shorter of life of lease or 10 years
Furniture and fixtures	5 years
Laboratory equipment	5 years
Computer equipment	3 years

120

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is included in loss from operations. Repairs and maintenance costs are expensed as incurred. The Company reviews the recoverability of all long-lived assets, including the related useful life, whenever events or changes in circumstances indicate that the carrying amount of a long-lived asset might not be recoverable.

Leases

The Company determines if an arrangement contains a lease at inception. For arrangements that contain a lease, lease classification, recognition, and measurement are determined at the lease commencement date. The Company has elected to separately account for lease and non-lease components in determining the lease liabilities and right-of-use assets. Lease liabilities and their corresponding right-of-use assets are recorded based on the present value of lease payments over the expected lease term. The Company’s lease agreements generally do not provide an implicit borrowing rate, therefore the Company uses its incremental borrowing rate at lease commencement to determine the present value of lease payments. The incremental borrowing rate is an entity-specific rate which represents the rate of interest a lessee would pay to borrow on a collateralized basis over a similar term with similar payments. All operating lease expenses are recognized on a straight-line basis over the lease term.

Research and Development Expenses

The Company expenses the cost of research and development as incurred. Research and development expenses comprise costs incurred in performing research and development activities, including salaries, share-based compensation and benefits, facilities costs, depreciation, amortization, manufacturing expenses and external costs of third-parties engaged to supply active pharmaceutical ingredient and drug product and conduct preclinical and clinical development activities and trials, as well as the cost of licensing technology, license fees, and other external costs. Advance payments for goods and services that will be used in future research and development activities are recorded as prepaid expenses and expensed when the activity is performed or when the goods have been received.

Accrued Research and Development Expenses

The Company has entered into various research and development contracts with research institutions and other companies. These agreements are generally cancelable, and related payments are recorded as research and development expenses as incurred. This process involves reviewing open contracts and purchase orders, communicating with Company personnel to identify services that have been performed on the Company’s behalf and estimating the level of service performed and the associated cost incurred for the service when the Company has not yet been invoiced or otherwise notified of actual costs. The majority of the Company’s service providers invoice in arrears for services performed, on a pre-determined schedule or when contractual milestones are met; however, some require advanced payments. The Company estimates accrued expenses as of each balance sheet date in the consolidated financial statements based on facts and circumstances known at that time. It periodically confirms the accuracy of these estimates with the service providers and makes adjustments if necessary. Examples of estimated accrued research and development expenses include fees paid to:

•Vendors, including central laboratories, in connection with preclinical development activities;

•Clinical Research Organizations, or CROs, and investigative sites in connection with preclinical studies and clinical trials; and

•Contract Manufacturing Organizations, or CMOs, in connection with drug substance and drug product formulation of preclinical and clinical trial materials.

The Company bases expenses related to preclinical studies and clinical trials on estimates of the services received and efforts expended pursuant to quotes and contracts with multiple research institutions and CROs that conduct and manage preclinical studies and clinical trials on its behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to vendors will exceed the level of services provided and result in a prepayment of the expense. Payments under some of these contracts depend on factors such as the successful enrollment of patients and the completion of clinical trial milestones. In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, the accrual or the amount of prepaid expenses is adjusted accordingly. Although the Company does not expect the estimates to be materially different from amounts actually incurred, its understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in reporting amounts that are too high or too low in any particular period. To date, there have not been any material adjustments to prior estimates of accrued research and development expenses.

121

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

Patent Costs

All patent related costs incurred in connection with filing and prosecuting patent applications are expensed as incurred due to the uncertainty about the recovery of the expenditure. Amounts incurred are classified as general and administrative expenses.

Share-Based Compensation

The Company measures share-based awards granted to employees and directors with service based vesting conditions only based on the fair value on the date of grant using the Black-Scholes option-pricing model. Compensation expense of those awards is recognized over the requisite service period, which is generally the vesting period of the respective award, using the straight-line method.

The Company measures share-based awards granted to employees and directors with both performance and service based vesting conditions based on the fair value on the date of grant using the Monte Carlo simulation model. Compensation expense of those awards is recognized over the determined vesting period, the period over which all the specified vesting conditions are to be satisfied, using the straight-line method.

For awards granted to consultants and non-employees, compensation expense is recognized over the period during which services are rendered until completed. At the end of each financial reporting period prior to completion of the service, the fair value of these awards is remeasured using the then-current fair value of the Company’s ordinary shares and updated assumption inputs in the Black-Scholes option-pricing model or the Monte Carlo simulation model.

The Company classifies share-based compensation expense in the consolidated statement of operations and comprehensive loss in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified.

The Black-Scholes option-pricing model uses key inputs and assumptions including the expected term of the option, share price volatility, risk-free interest rate, dividend yield, share price and exercise price which is equivalent to closing market value on the date of grant. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of share-based compensation expense.

The Monte Carlo simulation model uses key inputs and assumptions including share price volatility, risk-free interest rate, the expected date of satisfaction of vesting conditions and share price. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of share-based compensation expense.

The Company has elected to account for forfeitures as they occur.

Grant Awards

The Company may generate revenue from grant awards that reimburse certain allowable costs for specified projects. For contracts with third parties, when the Company has concluded that it is the principal in conducting the research and development, and where the funding arrangement is considered central to the Company’s ongoing operations, it classifies the recognized funding received as revenue.

Research and Development Credits

Research and development credits are available to the Company under the tax laws in both Ireland and the United States, based on qualifying research and development spend in each jurisdiction as defined under those tax laws. Research and development credits are generally recognized as a reduction of research and development expenses.

Fair Value of Financial Instruments

FASB guidance specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).

122

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

The three levels of the fair value hierarchy are as follows:

•Level 1 — Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 1 primarily consists of financial instruments whose value is based on quoted market prices such as exchange-traded instruments and listed equities.

•Level 2 — Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly (e.g. quoted prices of similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in markets that are not active). Level 2 includes financial instruments that are valued using models or other valuation methodologies.

•Level 3 — Unobservable inputs for the asset or liability. Financial instruments are considered Level 3 when their fair values are determined using pricing models, discounted cash flows or similar techniques and at least one significant model assumption or input is unobservable.

The Company’s short-term investments, RLNs and Derivative liability are carried at fair value, determined according to the fair value hierarchy above, see Note 3 for further details. The carrying amounts reported in the consolidated balance sheets for cash and cash equivalents, prepaid expenses and other current assets, accounts payable accrued expenses and other liabilities approximate their fair value based on the short-term maturity of these instruments.

Borrowings

Interest bearing long-term debt is recognized initially at fair value, net of transactions costs incurred. Subsequent to initial recognition, interest bearing long-term debt is measured at amortized cost with any difference between cost and redemption value being recognized as a non-cash component of interest expense in the income statement over the period of the borrowings on an effective interest basis.

Derivative Liability

The Company accounts for derivative instruments in accordance with ASC 815, which establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other financial instruments or contracts which require bifurcation and measurement at fair value for accounting purposes on the balance sheet date. Any liabilities recorded at fair value are revalued each reporting period with the resulting change in fair value reflected in adjustments to fair value of derivatives.

In determining the appropriate fair values, the Company uses the binomial option pricing model, and in the case of the change of control component, in combination with a DCF analysis, which is discussed in Note 3 – Fair Value of Financial Assets and Liabilities. The Company’s derivative financial instruments consist of embedded features in the Exchangeable Notes. The embedded derivatives include provisions that provide the noteholder with certain exchange rights and protections on a fundamental change such as a change of control. The effects of interactions between embedded derivatives are calculated and accounted for in arriving at the overall fair value of the financial instruments.

Royalty-Linked Notes

On recognition, the RLNs qualified as debt instruments under ASC 470, Debt, and were initially recorded at fair value, applying a DCF model, and then subsequently measured at amortized cost. In January 2021, the RLNs were exchange listed, and therefore, derivative accounting has been applied in accordance with ASC 815, Derivatives and Hedging, which establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other financial instruments or contracts which require bifurcation and measurement at fair value for accounting purposes on the balance sheet date. Any liabilities recorded at fair value are revalued at each reporting period with the resulting change in fair value reflected in adjustments to fair value of derivatives.

Ordinary Share Warrants

1.The Company accounts for ordinary share warrants in accordance with applicable accounting guidance provided in ASC 815, Derivatives and Hedging – Contracts in Entity's Own Equity, as either derivative liabilities or as equity instruments depending on the specific terms of the warrant agreement. Any warrants that (i) require physical settlement or net-share settlement or (ii) provide the Company with a choice of net-cash settlement or settlement in its own shares (physical settlement or net-share settlement), provided that such warrants are indexed to the Company's own shares is classified as equity. The Company completed a number of offerings containing freestanding derivatives which satisfy the criteria for

123

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

classification as equity instruments as the warrants do not contain cash settlement features or variable settlement provision that cause them to not be indexed to the Company's own stock. The Company assesses classification of its ordinary share warrants at each reporting date to determine whether the instruments still qualify for the scope exception under ASC 815.

Concentration of Credit Risk

Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, cash equivalents and short-term investments. The Company has most of its cash, cash equivalents and short-term investments at three accredited financial institutions in the United States and Ireland, in amounts that exceed federally insured limits. The Company does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships.

Income Taxes

The Company accounts for income taxes under the asset and liability method which requires deferred tax assets and liabilities to be recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, as well as net operating loss carryforwards and research and development tax credits.

Valuation allowances are provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized.

Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that has a greater than 50% likelihood of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest related to unrecognized tax benefits in interest expense and penalties in general and administrative expenses.

Net Loss Per Ordinary Share

Basic and diluted net loss per ordinary share is determined by dividing net loss attributable to ordinary shareholders by the weighted-average ordinary shares outstanding during the period in accordance with ASC 260, Earnings per Share. For the periods presented, the following ordinary shares underlying the options, unvested restricted share units, unvested performance restricted share units, warrants and the Exchangeable Notes have been excluded from the calculation because they would be anti-dilutive.

	Year ended December 31,
	2022		2021		2020
Options to purchase ordinary shares		355,591		1,068,639		63,431
Unvested restricted share units		128,728		119,017		—
Unvested performance restricted share units		—		—		65,527
Warrants		480,186		480,186		1,629,619
Exchangeable Notes		1,287,660		1,217,386		4,715,004
Total		2,252,165		2,885,228		6,473,581

Segment and Other Information

The Company determines and presents operating segments based on the information that is internally provided to the Chief Executive Officer, Chief Financial Officer and Chief Medical Officer, who together are considered the Company’s chief operating decision maker, in accordance with ASC 280, Segment Reporting. The Company has determined that it operates as a single business segment, which is the development and commercialization of innovative treatments for drug resistant bacterial infections.

124

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

The distribution of total operating expenses by geographical area was as follows:

	Year ended December 31,
Operating expenses	2022		2021		2020
Ireland	$	22,015	$	15,926	$	23,423
U.S.		8,332		8,554		8,703
Bermuda		36		57		—
Total	$	30,383	$	24,537	$	32,126

The distribution of long-lived assets by geographical area was as follows:

Long lived assets	December 31, 2022		December 31, 2021
Ireland	$	4,052	$	7,601
U.S.		303		578
Total	$	4,355	$	8,179

Retirement Plan

The Company has a defined contribution plan under Section 401(k) of the Internal Revenue Code (the 401(k) Plan). The 401(k) Plan covers all U.S. employees who meet defined minimum age and service requirements, and allows participants to defer a portion of their annual compensation on a pre-tax basis. If the 401(k) Plan is considered top-heavy at the end of the financial year, with key employee accounts accounting for greater than 60% of total 401(k) Plan assets, the Company is required to contribute a deferral rate of up to 3% to the 401(k) Plan on behalf of certain employees. The Company was not required to make a top-heavy contribution for the years ended December 31, 2022, 2021 and 2020.

Inventory

Inventories are valued at the lower of cost or net realizable value. Cost is determined using the first-in, first-out method for all inventories. The Company’s policy is to write down inventory that has become obsolete, inventory that has a cost basis in excess of its expected net realizable value and inventory in excess of expected requirements. The estimate of excess quantities is subjective and primarily dependent on the estimates of future demand for a particular product. If the estimate of future demand changes, the Company considers the impact on the reserve for excess inventory and adjusts the reserve as required. Increases in the reserve are recorded as charges in cost of product sales. For product candidates that have not been approved by the FDA, inventory used in clinical trials is expensed at the time of production and recorded as research and development expenses. For products that have been approved by the FDA, inventory used in clinical trials is expensed at the time the inventory is packaged for the clinical trial. Prior to an advisory committee providing a recommendation to the FDA that the Company’s application should be approved, costs related to manufacturing the product candidates are recorded as research and development expenses. All direct manufacturing costs incurred after this recommendation will be capitalized into inventory. The Company had no inventory as of December 31, 2022 or December 31, 2021.

Contingent Consideration

Certain license agreements contain milestone payments that could result in the requirement to make contingent consideration payments, see Note 15 for further details. Contingent consideration is recorded at the acquisition date estimated fair value of the contingent payment. The fair value of the contingent consideration is measured at each reporting period. Any related unwinding of discount is recognized as a finance expense. Other changes in fair value are recognized in profit or loss or capitalized as an intangible asset depending on the stage of development. As of December 31, 2022, no milestones had been met that required the Company to recognize contingent consideration.

Recently Adopted Accounting Pronouncements

In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity, which reduces the number of accounting models for convertible instruments and allows more contracts to qualify for equity classification. The ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2021. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

125

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

In May 2021, the FASB issued ASU 2021-04, Earnings Per Share (Topic 260), Debt—Modifications and Extinguishments (Subtopic 470-50), Compensation—Stock Compensation (Topic 718), and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options, which clarifies an issuer’s accounting for modifications or exchanges of freestanding written call options that remain equity-classified after modification. The ASU 2021-04 is effective for all entities for interim and annual periods in fiscal years beginning after December 15, 2021. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

In July 2021, the FASB issued ASU 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments, which requires a lessor to classify a lease with entirely or partially variable payments that do not depend on an index or rate as an operating lease if a different classification would result in a commencement date selling loss (Day 1 loss). For entities that have adopted ASU 2016-02, Leases, as of July 19, 2021, ASU 2021-05 is effective for annual and interim periods in fiscal years beginning after December 15, 2021 for public business entities and annual periods in fiscal years beginning after December 15, 2021 and interim periods in fiscal years beginning after December 15, 2022 for all other entities. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the FASB or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

(3)Fair Value of Financial Assets and Liabilities

The following table presents information about the Company’s financial assets that were carried at fair value on a recurring basis on the consolidated balance sheet as of December 31, 2022 and December 31, 2021 and indicates the fair value hierarchy of the valuation inputs utilized to determine such fair value.

December 31, 2022
Assets	Total		Level 1		Level 2		Level 3
Short-term investments:
Corporate bonds	$	7,781	$	—	$	7,781	$	—
Commercial paper		15,232		—		15,232		—
U.S. Treasury bonds		16,699		—		16,699		—
	$	39,712	$	—	$	39,712	$	—
December 31, 2021
Assets	Total		Level 1		Level 2		Level 3
Short-term investments:
Corporate bonds	$	31,703	$	—	$	31,703	$	—
Commercial paper		5,293		—		5,293		—
U.S. Treasury bonds		16,902		—		16,902		—
	$	53,898	$	—	$	53,898	$	—

See Note 4 for details on the short-term investments. The carrying amounts reported in the consolidated balance sheets for cash and cash equivalents, prepaid expenses and other current assets, accounts payable, accrued expenses and other current liabilities approximate their fair value based on the short-term maturity of these instruments.

126

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

The following table presents information about the Company’s debt, Exchangeable Notes, Derivative liability and RLNs and indicates the fair value hierarchy of the valuation inputs utilized to determine the approximate fair value:

December 31, 2022
Liabilities	Book Value		Approximate Fair Value		Level 1		Level 2		Level 3
Exchangeable Notes
Long-term exchangeable notes	$	10,094	$	10,827	$	—	$	10,827	$	—
Derivative liability - exchange option and change of control		196		196		—		—		196
Revenue Futures
Royalty-linked notes		18,372		18,372		—		—		18,372
Total	$	28,662	$	29,395	$	—	$	10,827	$	18,568
December 31, 2021
Liabilities	Book Value		Approximate Fair Value		Level 1		Level 2		Level 3
Debt
Current portion of long-term debt	$	1,627	$	1,627	$	—	$	1,627	$	—
Exchangeable Notes
Long-term exchangeable notes		6,930		9,495		—		9,495		—
Derivative liability - exchange option and change of control		6,058		6,058		—		—		6,058
Revenue Futures
Royalty-linked notes		17,968		17,968		—		—		17,968
Total	$	32,583	$	35,148	$	—	$	11,122	$	24,026

The book value of the current portion of long-term debt approximates its fair value due to the short-term nature of the balance.

The fair value of long-term Exchangeable Notes was determined using DCF analysis using the fixed interest rate outlined in the indenture governing the Exchangeable Notes (Exchangeable Notes Indenture), without consideration of transaction costs, which represents a Level 2 basis of fair value measurement.

The Level 3 liabilities held as of December 31, 2022 consist of the embedded exchange option and change of control premium contained in the Exchangeable Notes (see Note 10 – Debt) and a separate financial instrument, that was issued as part of the Units, the RLNs (see Note 11 – Royalty-Linked Notes). The exchange option and change of control premium met the criteria requiring these to be bifurcated and accounted for separately from the host debt in accordance with ASC 815-15, Derivatives and Hedging; Embedded Derivatives. The exchange option and change of control premium are presented as a Derivative liability upon issuance of the Exchangeable Notes under the Private Placement and Rights Offering and are subsequently remeasured to fair value at the end of each reporting period. At any time on or after January 21, 2021, subject to specified limitations, the Exchangeable Notes are exchangeable for the Company’s ordinary shares, cash or a combination of ordinary shares and cash, at an exchange rate of 87.8139 shares per $1,000 of principal and interest on the Exchangeable Notes (equivalent to an exchange price of approximately $11.3877 per ordinary share) as of December 31, 2022, which was adjusted from an initial exchange rate of 66.666 shares per $1,000 principal and interest on the Exchangeable Notes (equivalent to an initial exchange price of $15.00 per ordinary share) and is subject to further adjustment pursuant to the terms of the Exchangeable Notes Indenture. Beginning on January 21, 2021 to December 31, 2022, certain noteholders of $39,201 aggregate principal amount of Exchangeable Notes have exchanged their notes for an aggregate of 3,592,555 of the Company’s ordinary shares, which included accrued and unpaid interest relating to such notes. The aggregate principal amount of Exchangeable Notes outstanding as of December 31, 2022 was $12,607. The fair value of the exchange option at December 31, 2022 is $49.

In the event of a fundamental change that is not a liquidation event (Fundamental Change), under the Exchangeable Notes Indenture, the Company will be required to pay each holder of an Exchangeable Note the greater of three times the outstanding principal amount of such Exchangeable Note and the consideration that would be received by the holder of such Exchangeable Note, in connection with such Fundamental Change, if the holder had exchanged its note for ordinary shares immediately prior to the consummation of such Fundamental Change, plus any accrued and unpaid interest. The Derivative liability, representing the change of control feature, was recorded at a fair value of $147 at December 31, 2022.

The fair value of each component of the Derivative liability was determined using the binomial option pricing model, and in the case of the change of control component, in combination with a DCF analysis, without consideration of transaction costs, which represents a Level 3 basis of fair value measurement. The key inputs to valuing the Derivative liability as of December 31, 2022 include the terms of the Exchangeable Notes Indenture, the Company’s share price and market capitalization, the expected annual

127

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

volatility of the Company’s ordinary shares, management’s assumption regarding the probability of a Fundamental Change pursuant to the terms of the Exchangeable Notes Indenture, and the risk-free interest rate. Fair value measurements are highly sensitive to changes in these inputs and significant changes in these inputs could result in a significantly higher or lower fair value.

The following table presents the changes in fair value of the Company's Derivative liability:

	Year Ended December 31, 2022			Year Ended December 31, 2021
Balance at January 1	$	6,058		$	28,865
Conversion of Exchangeable Notes		—			(80,512	)
Adjustment to fair value		(5,862	)		57,705
Balance at December 31	$	196		$	6,058

The following summary table shows the assumptions used in the binomial option pricing model to estimate the fair value of the exchange option:

	December 31, 2022	December 31, 2021
Share price	$0.84	$5.88
Market capitalization	$10,582,858	$71,647,911
Volatility	100%	130%
Risk-free interest rate	4.46%	1.00%
Dividend rate	0%	0%

The additional significant assumption used in the DCF model to estimate the fair value of the change of control feature at December 31, 2022 was management’s assumption regarding the probability of a Fundamental Change pursuant to the terms of the Exchangeable Notes Indenture.

The RLN liability is carried at fair value on the consolidated balance sheet (see Note 11 – Royalty-Linked Notes). The total fair value of $18,372 was determined using DCF analysis, without consideration of transaction costs, which represents a Level 3 basis of fair value measurement. The key inputs to valuing the RLNs were the terms of the indenture governing the RLNs (RLN Indenture), the expected cash flows to be received by holders of the RLNs based on management’s revenue forecasts of U.S. sulopenem sales and a risk-adjusted discount rate to derive the net present value of expected cash flows. The RLNs will be subject to a maximum return amount, including all principal and payments and certain default interest in respect of uncurable defaults, of $160.00 (or 4,000 times the principal amount of such note). The discount rate applied to the model was 22% and 20% for the years ended December 31, 2022 and 2021, respectively. Fair value measurements are highly sensitive to changes in these inputs and significant changes in these inputs could result in a significantly higher or lower fair value.

There have been no transfers of assets or liabilities between the fair value measurement levels.

(4)Short-term Investments

The Company classifies its short-term investments as available-for-sale. Short-term investments comprise highly liquid investments with minimum “A-” rated securities and as at year end consist of corporate bonds, commercial paper and U.S. Treasury bonds with maturities of more than three months at the date of purchase. Short-term investments as of December 31, 2022 have a weighted average maturity of 0.36 years. The investments are reported at fair value with unrealized gains or losses recorded in the consolidated statements of operations and comprehensive loss. Any differences between the amortized cost and fair value of investments are represented by unrealized gains or losses. The fair value of U.S. Treasury bonds, corporate bonds and commercial paper are represented by Level 2 fair value measurements - quoted price for a similar asset, or other observable inputs such as interest rates or yield curves.

The following table represents the Company’s available-for-sale short-term investments by major security type as of December 31, 2022:

December 31, 2022					Maturity by period
	Amortized	Unrealized	Unrealized	Fair Value	Less than 1
Available-for-sale	Cost	Gains	(Losses)	Total	Year	1 to 5 Years
Corporate bonds	$7,836	$—	$(55)	$7,781	$7,781	$—
Commercial paper	15,230	2	—	15,232	15,232	—
U.S. Treasury bonds	16,996	—	(297)	16,699	16,699	—
Total	$40,062	$2	$(352)	$39,712	$39,712	$—

128

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

The following table represents the Company’s available for sale short-term investments by major security type as of December 31, 2021:

December 31, 2021					Maturity by period
	Amortized	Unrealized	Unrealized	Fair Value	Less than 1
Available-for-sale	Cost	Gains	(Losses)	Total	Year	1 to 5 Years
Corporate bonds	$31,723	$1	$(21)	$31,703	$30,677	$1,026
Commercial paper	5,293	—	—	5,293	5,293	—
U.S. Treasury bonds	16,989	—	(87)	16,902	—	16,902
Total	$54,005	$1	$(108)	$53,898	$35,970	$17,928

(5)Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

	December 31, 2022		December 31, 2021
Prepaid research and development expenses	$	458	$	—
Research and development tax credit receivable		118		840
Prepaid insurance		592		624
Interest receivable		55		290
Value added tax receivable		38		75
Other prepaid assets		42		56
Short-term deposits		35		37
Total	$	1,338	$	1,922

(6)Intangible Asset, net

Intangible asset and related accumulated amortization are as follows:

	December 31, 2022	December 31, 2021
Gross intangible asset	$5,148	$5,148
Less: accumulated amortization	(3,429)	(1,713)
	$1,719	$3,435

On December 10, 2021, the Company entered into an amendment to an agreement with a supplier whereby advance payments made from June 2016 to January 2020 are being set against a reservation fee for a tableting facility for the period from January 1, 2021 to December 31, 2023. This reservation right is being amortized over the three year term of the amended agreement.

(7)Property and Equipment, net

Property and equipment and related accumulated depreciation are as follows:

	December 31, 2022			December 31, 2021
Leasehold improvements	$	148		$	148
Furniture and fixtures		120			120
Laboratory equipment		—			86
Computer equipment		85			23
		353			377
Less: accumulated depreciation		(284	)		(286	)
	$	69		$	91

Depreciation expense was $84, $391 and $161 for the years ended December 31, 2022, 2021 and 2020, respectively.

(8)Leases

The Company has entered into a number of operating leases, primarily for office space and commercial property. These leases have remaining terms which range from .83 years to 5.49 years. The renewal option on one lease was exercised in February 2022 for an additional period of three years, extending this lease term to June 2025. The renewal option on another lease was derecognized in

129

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

June 2022 as it is no longer reasonably certain that the option will be exercised, resulting in a reduction in the remaining term from 16 to six years. In September 2020, the Company entered into a sublease agreement for a commercial unit that extends through September 2023. In November 2021, the Company entered into a 12-month lease, with a rolling extension, for office space, and in May 2022, the Company entered into a 6-month lease for office space, which was extended to November 2023 and has elected not to apply the measurement and recognition requirements of ASC 842 to these short-term leases as any renewal term exercised or considered reasonably certain of exercise by the Company does not extend more than 12 months from the end of the previously determined lease term. Certain leases contain variable lease payments, including payments based on an index or rate. Variable lease payments based on an index or rate are initially measured using the index or rate in effect at lease commencement. Certain agreements contain both lease and non-lease components. The Company has elected to separately account for these components in determining the lease liabilities and right-of-use assets. The Company’s lease agreements generally do not provide an implicit borrowing rate; therefore, an internal incremental borrowing rate was determined based on information available at lease commencement date for the purposes of determining the present value of lease payments. The Company used the incremental borrowing rate on January 1, 2019 for all leases that commenced prior to that date. All operating lease expenses are recognized on a straight-line basis over the lease term. The Company recognized $753, $1,009 and $991 of operating lease costs for right-of-use assets during the years ended December 31, 2022, 2021 and 2020, respectively. The Company recognized $243 of rental expenses on short-term leases during the year ended December 31, 2022. The Company recognized $293, $335 and $118 of sublease income during the years ended December 31, 2022, 2021 and 2020, respectively.

Information related to the Company’s right-of-use assets and related lease liabilities is as follows:

	December 31, 2022		December 31, 2021
Cash paid for operating lease liabilities	$	709	$	944

	December 31, 2022			December 31, 2021
Weighted-average remaining lease term	5.04 years			13.97 years
Weighted-average discount rate		5.5	%		7.0	%

Right-of-use assets and lease liabilities for the Company’s operating leases were recorded in the consolidated balance sheet as follows, representing the Company’s right to use the underlying asset for the lease term (“Other assets”) and the Company’s obligation to make lease payments (“Other current liabilities” and “Other liabilities”):
 

	December 31, 2022	December 31, 2021
Other assets	$1,770	$3,741
Other current liabilities	$332	$464
Other liabilities	1,304	3,436
Total lease liabilities	$1,636	$3,900

Future lease payments included in the measurement of lease liabilities on the consolidated balance sheet as of December 31, 2022 for the following five fiscal years and thereafter were as follows:

Due in 12 month period ended December 31,
2023	$407
2024	412
2025	344
2026	295
2027	295
Thereafter	74
	$1,827
Less imputed interest	(191)
Total lease liabilities	$1,636

130

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

(9)Accrued Expenses

Accrued expenses consist of the following:

	December 31, 2022		December 31, 2021
Accrued payroll and bonus expenses	$	1,971	$	771
Accrued clinical trial costs		1,549		45
Accrued professional fees		606		16
Accrued other expenses		206		256
Accrued manufacturing expenses		14		77
Total	$	4,346	$	1,165

(10)Debt

Secured Credit Facility

On April 27, 2018, the Company’s subsidiaries, Iterum Therapeutics International Limited, Iterum Therapeutics US Holding Limited and Iterum Therapeutics US Limited (the Borrowers), entered into a loan and security agreement (the Loan and Security Agreement) with SVB pursuant to which SVB agreed to lend the Borrowers up to $30,000 in two term loans. $15,000 of the secured credit facility was funded on closing. A second draw of up to $15,000 was available to the Company through October 31, 2019, upon satisfaction of either of the following: (i) the achievement by the Company of both non-inferiority and superiority primary endpoints from its Phase 3 uncomplicated urinary tract infection (uUTI) trial, as well as reporting satisfactory safety data from the trial, or (ii) the achievement of non-inferiority primary endpoints from both its Phase 3 uUTI and complicated urinary tract infection (cUTI) trials, as well as reporting satisfactory safety data from the trials. The Company did not satisfy the conditions for the second draw before the deadline of October 31, 2019.

Required monthly amortization payments for the initial $15,000 draw commenced on November 1, 2019 and total principal repayments of $1,552 were made during the year ended December 31, 2022. Interest accrued at a floating per annum rate equal to the greater of (i) 8.31%; or (ii) 3.89% above the Wall Street Journal prime rate, and was payable monthly in arrears. All outstanding principal, plus a 4.20% final interest payment, were due and paid on March 1, 2022 (the maturity date), effectively terminating the Loan and Security Agreement. The final payment fee of $630, which represented 4.2% of the funded loan, was accreted using the effective interest method over the life of the loan as interest expense.

In connection with the initial $15,000 draw, the Company issued SVB and Life Sciences Fund II LLC (LSF) warrants to purchase an aggregate of 19,890 Series B convertible preferred shares (which converted into warrants to purchase 1,326 ordinary shares upon the Company’s initial public offering (IPO)) at an exercise price of $282.75 per share. These warrants will expire on April 27, 2028.

The loan proceeds were allocated based on the relative fair values of the debt instrument and the warrant instrument. The fair value of the warrants and the closing costs were recorded as debt discounts and are being amortized using the effective interest rate method over the term of the loan. The effective annual interest rate of the outstanding debt was approximately 12.51% on March 1, 2022. The Company recognized $16, $556 and $1,355 of interest expense related to the Loan and Security Agreement during the years ended December 31, 2022, 2021 and 2020, respectively, including $6, $142 and $404 related to the accretion of the debt discounts and deferred financing costs during the years ended December 31, 2022, 2021 and 2020, respectively. All outstanding amounts were repaid on March 1, 2022, effectively terminating the Loan and Security Agreement.

In connection with the Private Placement, Iterum Bermuda was joined as a party to the Loan and Security Agreement as a borrower and the Loan and Security Agreement was amended on January 16, 2020 to, among other things, modify the definition of subordinated debt to include the RLNs and Exchangeable Notes.

2025 Exchangeable Notes

On January 21, 2020, the Company completed a Private Placement pursuant to which its wholly owned subsidiary, Iterum Bermuda issued and sold $51,588 aggregate principal amount of Exchangeable Notes and $103 aggregate principal amount of RLNs, to a group of accredited investors. On September 8, 2020, the Company completed a Rights Offering pursuant to which Iterum Bermuda issued and sold $220 aggregate principal amount of Exchangeable Notes and $0.5 aggregate principal amount of RLNs, to existing shareholders. The Securities were sold in Units with each Unit consisting of an Exchangeable Note in the original principal amount of $1,000 and 50 RLNs. The Units were sold at a price of $1,000 per Unit.

131

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

At any time on or after January 21, 2021, subject to specified limitations, the Exchangeable Notes are exchangeable for the Company’s ordinary shares, cash or a combination of ordinary shares and cash, at the Company’s election, at an exchange rate of 87.8139 shares per $1,000 principal and interest on the Exchangeable Notes (equivalent to an exchange price of approximately $11.3877 per ordinary share) as of December 31, 2022, which exchange rate was adjusted from an initial exchange rate of 66.666 shares per $1,000 principal and interest on the Exchangeable Notes (equivalent to an initial exchange price of $15.00 per ordinary share) and is subject to further adjustment pursuant to the terms of the Exchangeable Notes Indenture. Any accrued and unpaid interest being exchanged will be calculated to include all interest accrued on the Exchangeable Notes being exchanged to, but excluding, the exchange settlement date. Beginning on January 21, 2021 to December 31, 2022, certain noteholders of $39,201 aggregate principal amount of Exchangeable Notes have completed a non-cash exchange of their notes for an aggregate of 3,592,555 of the Company’s ordinary shares, which included accrued and unpaid interest relating to such notes. The aggregate principal amount of Exchangeable Notes outstanding as of December 31, 2022 was $12,607.

In addition, the Exchangeable Notes will become due and payable by the Company upon the occurrence of a Fundamental Change as defined in the Exchangeable Notes Indenture. The Company will be required to pay each holder of the Exchangeable Notes the greater of three times the outstanding principal amount of such Exchangeable Note and the consideration that would be received by the holder of such Exchangeable Note in connection with such Fundamental Change if the holder had exchanged its note for ordinary shares immediately prior to the consummation of such Fundamental Change, plus any accrued and unpaid interest.

The Company evaluates its debt and equity issuances to determine if those contracts, or embedded components of those contracts, qualify as derivatives under ASC 815-15, Derivatives and Hedging, requiring separate recognition in the Company’s financial statements. The Company evaluated the accounting for the issuance of the Exchangeable Notes and concluded that the embedded exchange option and change of control feature are considered a Derivative liability under ASC 815-15 requiring bifurcation, from the Exchangeable Notes, as it does not qualify for the scope exceptions for contracts in an entity’s own equity given the terms of the Exchangeable Notes. The exchange option and change of control feature are accounted for as a Derivative liability, under ASC 815-15, and are required to be separated and recorded as a single liability, which is revalued each reporting period with the resulting change in fair value reflected in other income, net, in the consolidated statements of operations and comprehensive loss.

The fair value of the Derivative liability related to the Private Placement on January 21, 2020 was $27,038, and the fair value of the Derivative liability related to the Rights Offering on September 8, 2020 was $82, both of which were recorded as a reduction to the book value of the host debt contract. This debt discount is being amortized to interest expense over the term of the debt using the effective interest method. Transaction costs amounting to $2,848 were allocated to the exchange option. These costs are reflected in financing transaction costs in the consolidated statements of operations and comprehensive loss for the year ended December 31, 2020. Transaction costs amounting to $2,814 were allocated to the debt host and capitalized in the host debt book value.

In circumstances where the embedded exchange option in a convertible instrument is required to be bifurcated, and there are other embedded derivative instruments in the convertible instrument that are required to be bifurcated, the derivative instruments are accounted for as a single, compound derivative instrument. The classification of derivative instruments, including whether such instruments should be recorded as liabilities or as equity, is reassessed at the end of each reporting period. Derivative instrument liabilities are classified in the balance sheet as current or non-current based on whether or not settlement of the derivative instrument is expected within twelve months of the balance sheet date.

The Company determined that all other features of the Exchangeable Notes were clearly and closely associated with a debt host and did not require bifurcation as a Derivative liability. The initial value of the Exchangeable Notes on inception, net of transaction costs was $9,891.

The Company recognized $820, $1,078 and $3,180 of interest expense related to the Exchangeable Notes during the years ended December 31, 2022, 2021 and 2020, respectively, and $2,344 , $2,893 and $7,764 related to the amortization of the debt discounts and deferred financing costs during the years ended December 31, 2022, 2021 and 2020, respectively. These amounts are recorded in interest expense, net in the consolidated statements of operations and comprehensive loss for the years ended December 31, 2022, 2021 and 2020, respectively. The balance of the Exchangeable Notes at each reporting date is as follows:

132

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

	December 31, 2022
	Principal	Accrued Interest
January 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	$51,588	$5,058
September 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	220	20
Conversion of $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	(39,201)	(2,697)
2025 Exchangeable Notes	12,607	2,381
Unamortized discount and debt issuance costs	(4,894)	—
2025 Exchangeable Notes, net	$7,713	$2,381

	December 31, 2021
	Principal	Accrued Interest
January 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	$51,588	$4,246
September 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	220	12
Conversion of $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	(39,201)	(2,697)
2025 Exchangeable Notes	12,607	1,561
Unamortized discount and debt issuance costs	(7,238)	—
2025 Exchangeable Notes, net	$5,369	$1,561

Payment Protection Program

On April 3, 2020, the U.S. Small Business Administration (SBA) launched the Paycheck Protection Program, which was established following the signing of the CARES Act on March 27, 2020. On April 30, 2020, our wholly owned subsidiary, Iterum Therapeutics US Limited (Iterum US Limited), entered into the PPP loan with SVB under the Paycheck Protection Program, pursuant to the Company receiving a PPP loan of $744 with a fixed 1% annual interest rate and a maturity of two years. Under the terms of the agreement, there were no payments due by the Company until the SBA remitted the forgiveness amount to Iterum US Limited or until after the 10 months after the end of the six-month period beginning April 30, 2020 (the Deferral Period). Following the Deferral Period, equal monthly repayments of principal and interest were due to fully amortize the principal amount outstanding on the PPP loan by the maturity date. The SBA forgave $340 of the loan in November 2020, and the remaining loan of $404 began amortization in December 2020. Total principal repayments of $69, $309 and $26 were made during the years ended December 31, 2022, 2021 and 2020, respectively. The Company recognized $0, $2 and $1 of interest expense related to the loan agreement during the years ended December 31, 2022, 2021 and 2020, respectively.

Scheduled principal payments on outstanding debt, including principal amounts owed to RLN holders (see Note 11 – Royalty-Linked Notes) as of December 31, 2022, for the following five fiscal years and thereafter were as follows:

Year Ending December 31,
2023	$—
2024	—
2025	12,607
2026	—
2027	—
Thereafter	104
	$12,711

(11)Royalty-Linked Notes

Liability Related to Sale of Future Royalties

133

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

On January 21, 2020, as part of the Private Placement, the Company issued 2,579,400 RLNs to a group of accredited investors. On September 8, 2020, as part of the Rights Offering, the Company issued 11,000 RLNs to existing shareholders. The RLNs will entitle the holders thereof to payments, at the applicable payment rate, based solely on a percentage of the Company’s net revenues from U.S. sales of specified sulopenem products earned through December 31, 2045, but will not entitle the holders thereof to any payments unless the Company receives FDA approval for one or more specified sulopenem products prior to December 31, 2025 and the Company earns net revenues on such product. If any portion of the principal amount of the outstanding RLNs, equal to $0.04 per RLN, has not been paid as of the end date on December 31, 2045 (or December 31, 2025, in the event that the Company has not yet received FDA approval with respect to one or more specified sulopenem products by such date), Iterum Bermuda must pay the unpaid portion of the principal amount. The RLNs will earn default interest if the Company breaches certain obligations under the RLN Indenture (but do not otherwise bear interest) and will be subject to a maximum return amount, including all principal and payments and certain default interest in respect of uncurable defaults, of $160.00 (or 4,000 times the principal amount of such note). The RLNs are redeemable at any time, at the Company’s option, subject to the terms of the RLN Indenture.

In accordance with exceptions allowed under ASC 815-10, Derivatives and Hedging, this transaction was initially accounted for as a debt liability under ASC 470, Debt. Subsequent to the listing of the RLNs on the Bermuda Stock Exchange in January 2021, the RLNs are accounted for as a derivative and are remeasured to fair value at each reporting date. The Company has no obligation to pay any amount to the noteholders until the net revenue of the specified products are earned. In order to record the amortization of the liability, the Company was required to estimate the total amount of future net revenue to be earned in each period under the RLN Indenture and the payments that will be passed through to the noteholders over the life of the RLN Indenture.

The note proceeds from both the Private Placement and subsequent Rights Offering were allocated based on the relative fair value of the debt instrument, less transaction costs amounting to $1,239, as debt discounts. The Company imputed interest on the amortized cost of the liability using an estimated effective interest rate of 31.7% up to the date of the change in measurement. Payments to the noteholders in each period, related to future sales of sulopenem, would offset the liability. Subsequent to recognition of the RLN in accordance with ASC 815, Derivatives and Hedging, in January 2021, the fair value of the RLN is determined using DCF analysis, without consideration of transaction costs, which represents a Level 3 basis of fair value measurement. The Company periodically assesses the revenue forecasts of the specified sulopenem products and the related payments.

Subsequent to the listing of the RLNs on the Bermuda Stock Exchange in January 2021, the Company recognized the remaining unaccreted interest balance of $1,024 related to debt discounts and deferred financing costs under ASC 470, Debt, in the consolidated statement of operations and comprehensive loss for the year ended December 31, 2021. The balance of the RLNs at each reporting date is as follows:

	December 31, 2022
Total liability related to the sale of future royalties, on inception	$10,990
Liability related to the sale of future royalties, arising from the Rights Offering	51
Amortization of discount and debt issuance costs	3,666
Adjustments to fair value	3,665
Total liability related to the sale of future royalties at December 31, 2021	$18,372
Current Portion	—
Long-term Portion	$18,372

	December 31, 2021
Total liability related to the sale of future royalties, on inception	$10,990
Liability related to the sale of future royalties, arising from the Rights Offering	51
Amortization of discount and debt issuance costs	3,666
Adjustments to fair value	3,261
Total liability related to the sale of future royalties at December 31, 2020	$17,968
Current Portion	—
Long-term Portion	$17,968

(12)Shareholders’ Equity / (Deficit)

The Company’s capital structure consists of ordinary shares and undesignated preferred shares. Under Irish law, the Company is prohibited from allotting shares without consideration. Accordingly, at least the nominal value of the shares issued underlying any

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Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

warrant, pre-funded warrant, restricted share award, restricted share unit, performance share award, bonus share or any other share based grant must be paid pursuant to the Irish Companies Act 2014 (Irish Companies Act).

Ordinary Shares

At the Company’s extraordinary general meeting of shareholders on January 28, 2021, the Company’s shareholders approved an increase of 10,000,000 ordinary shares of $0.01 par value each to the number of authorized ordinary shares and the Company’s Articles of Association were amended accordingly. The Company has authorized ordinary shares of 20,000,000 ordinary shares of $0.01 par value each as of December 31, 2022. The holders of ordinary shares are entitled to one vote for each share held. The holders of ordinary shares currently have no preemptive or other subscription rights, and there are no redemption or sinking fund provisions with respect to such shares.

The Company filed a universal shelf registration statement on Form S-3 with the SEC, which was declared effective on October 17, 2022 (File No. 333-267795), and pursuant to which the Company registered for sale up to $100.0 million of any combination of debt securities, ordinary shares, preferred shares, subscription rights, purchase contracts, units and/or warrants from time to time and at prices and on terms that the Company may determine.

On October 7, 2022, the Company entered into a sales agreement with HC Wainwright, as agent, pursuant to which the Company may offer and sell ordinary shares, nominal value $0.01 per share, for aggregate gross sales proceeds of up to $16.0 million (subject to the availability of ordinary shares), from time to time through HC Wainwright by any method permitted that is deemed to be an "at the market offering" as defined in Rule 415 (a)(4) promulgated under the Securities Act of 1933, as amended. During the year ended December 31, 2022, the Company sold 356,933 ordinary shares under the “at-the-market” agreement at an average price of $1.25 per share for net proceeds of $0.4 million.

On February 3, 2021, the Company entered into an underwriting agreement (the Underwriting Agreement) pursuant to which it issued and sold 2,318,840 ordinary shares, $0.01 nominal value per share, at a public offering price per share of $17.25 (the February 2021 Underwritten Offering). The February 2021 Underwritten Offering closed on February 8, 2021. Pursuant to the Underwriting Agreement, the Company granted the underwriter an option for a period of 30 days to purchase up to an additional 347,826 ordinary shares on the same terms and conditions, which the underwriter exercised in full on February 10, 2021. This exercise increased the total number of ordinary shares sold by the Company in the offering to 2,666,666 shares, which resulted in aggregate gross proceeds of $46,000 and net proceeds of $42,119 after deducting underwriting discounts and commissions and other offering expenses.

On February 9, 2021, the Company completed a registered direct offering (the February 2021 Registered Direct Offering), pursuant to which the Company issued and sold an aggregate of 1,166,666 ordinary shares, $0.01 nominal value per share, at a purchase price per share of $30.00, for aggregate gross proceeds of $35,000 and net proceeds of $32,235 after deducting placement agent fees and other offering expenses. The closing date of the February 2021 Registered Direct Offering was February 12, 2021. The Company offered the ordinary shares in the June 3, 2020 Offering, June 30, 2020 Offering, February 2021 Underwritten Offering and February 2021 Registered Direct Offering pursuant to its universal shelf registration statement on Form S-3, which was declared effective on July 16, 2019 (File No. 333-232569).

Beginning on January 21, 2021 to December 31, 2022, certain noteholders of $39,201 aggregate principal amount of Exchangeable Notes have exchanged their notes for an aggregate of 3,592,555 of the Company’s ordinary shares, which included accrued and unpaid interest relating to such notes. The aggregate principal amount of Exchangeable Notes outstanding as of December 31, 2022 was $12,607.

Warrants to purchase Ordinary Shares

In connection with the initial drawdown under the Loan and Security Agreement, the Company issued SVB and LSF warrants to purchase an aggregate of 19,890 Series B convertible preferred shares (which converted into warrants to purchase 1,326 ordinary shares upon the Company’s IPO) at an exercise price of $282.75 per share. These warrants will expire on April 27, 2028. No warrants had been exercised as of December 31, 2022.

In connection with the June 3, 2020 Offering completed on June 5, 2020, pursuant to the June 3, 2020 SPA, in a concurrent private placement, the Company issued and sold to institutional investors warrants to purchase up to 99,057 ordinary shares. Upon closing, the warrants became exercisable immediately at an exercise price of $24.30 per ordinary share, subject to adjustment in certain circumstances, and will expire on December 5, 2025. Warrants to purchase 13,868 ordinary shares, amounting to 7% of the ordinary shares issued under the June 3, 2020 SPA, were issued to designees of the placement agent on the closing of the June 3, 2020 Offering. Upon closing, the warrants issued to such designees were exercisable immediately at an exercise price of $31.5465 per ordinary share and will expire on June 3, 2025. No warrants had been exercised as of December 31, 2022.

In connection with the June 30, 2020 Offering completed on July 2, 2020, pursuant to the June 30, 2020 SPA, in a concurrent private placement, the Company has also issued and sold to institutional investors warrants to purchase up to 112,422 ordinary shares. Upon closing, the warrants became exercisable immediately at an exercise price of $21.30 per ordinary share, subject to adjustment in

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ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

certain circumstances, and will expire on January 2, 2026. Warrants to purchase 15,739 ordinary shares, amounting to 7% of the ordinary shares issued under the June 30, 2020 SPA, were issued to designees of the placement agent on closing of the June 30, 2020 Offering. Upon closing, the warrants issued to such designees were exercisable immediately at an exercise price of $27.7965 per ordinary share and will expire on June 30, 2025. As of December 31, 2022, warrants issued in connection with the June 30, 2020 Offering had been exercised for 84,317 ordinary shares, for net proceeds of $1,796.

In connection with the October 2020 Offering, the Company issued and sold warrants to purchase up to 1,346,153 ordinary shares. Upon closing, the warrants became exercisable immediately at an exercise price of $9.75 per ordinary share, subject to adjustment in certain circumstances, and will expire on October 27, 2025. Warrants to purchase 125,641 ordinary shares, which represents a number of ordinary shares equal to 7.0% of the aggregate number of ordinary shares and pre-funded warrants sold in the October 2020 Offering, were issued to designees of the placement agent on closing of the October 2020 Offering. Upon closing, the warrants issued to such designees became exercisable immediately at an exercise price of $12.1875 per ordinary share and expire on October 22, 2025. As of December 31, 2022, warrants issued in connection with the October 2020 Offering had been exercised for 1,392,701 ordinary shares, for net proceeds of $13,885.

In connection with the February 2021 Underwritten Offering, the Company issued to the underwriter’s designees warrants to purchase 162,318 ordinary shares, amounting to 7.0% of the aggregate number of ordinary shares sold in the February 2021 Underwritten Offering which closed on February 8, 2021. The warrants issued to such designees have an exercise price of $21.5625 per ordinary share, were exercisable upon issuance and will expire on February 3, 2026. As of December 31, 2022, warrants issued in connection with the February 2021 Underwritten Offering had been exercised for 25,333 ordinary shares, for net proceeds of $546.

In connection with the February 2021 Underwritten Offering, the Company granted the underwriter an option for a period of 30 days to purchase an additional 347,826 ordinary shares. Upon the underwriter’s exercise of its option, on February 10, 2021, the Company issued warrants to purchase an additional 24,347 ordinary shares to the underwriter’s designees, amounting to 7.0% of the aggregate number of additional ordinary shares sold pursuant to the underwriter’s option. The warrants issued to such designees have an exercise price of $21.5625 per ordinary share, were exercisable upon issuance and will expire on February 3, 2026. No warrants had been exercised as of December 31, 2022.

In connection with the February 2021 Registered Direct Offering which closed on February 12, 2021, warrants to purchase 81,666 ordinary shares, amounting to 7.0% of the aggregate number of ordinary shares issued under the securities purchase agreement, were issued to designees of the placement agent upon closing. The warrants issued to such designees were exercisable upon issuance at an exercise price of $37.50 per ordinary share and will expire on February 9, 2026. No warrants had been exercised as of December 31, 2022.

Undesignated Preferred Shares

The Company has authorized 100,000,000 undesignated preferred shares of $0.01 par value each as of December 31, 2022. The Company's Board of Directors is authorized by the Company’s Articles of Association to determine the rights attaching to the undesignated preferred shares including rights of redemption, rights as to dividends, rights on winding up and conversion rights. There were no undesignated preferred shares in issue as of December 31, 2022 or December 31, 2021.

(13)Share-Based Compensation

On November 18, 2015, the Company’s Board of Directors adopted and approved the 2015 Equity Incentive Plan (the 2015 Plan), which authorized the Company to grant up to 14,895 ordinary shares in the form of incentive share options, nonstatutory share options, share appreciation rights, restricted share awards, restricted share units and other share awards. The types of share-based awards, including the rights amount, terms, and exercisability provisions of grants are determined by the Company’s Board of Directors. The purpose of the 2015 Plan was to provide the Company with the flexibility to issue share-based awards as part of an overall compensation package to attract and retain qualified personnel. On May 18, 2017, the Company amended the 2015 Plan to increase the number of ordinary shares available for issuance under the 2015 Plan by 14,640 shares to 29,535 shares.

On March 14, 2018, the Company’s Board of Directors adopted and approved the 2018 Equity Incentive Plan (the 2018 Plan), which became effective upon the execution and delivery of the underwriting agreement related to the Company’s IPO in May 2018. Since adopting the 2018 Plan, no further grants will be made under the 2015 Plan. The ordinary shares underlying any options that are forfeited, canceled, repurchased or are otherwise terminated by the Company under the 2015 Plan will not be added back to the ordinary shares available for issuance.

The 2018 Plan originally authorized the Company to grant up to 67,897 ordinary shares in the form of incentive share options, nonstatutory share options, share appreciation rights, restricted share awards, restricted share units, performance share awards,

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ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

performance cash awards and other share awards. The types of share-based awards, including the amount, terms, and exercisability provisions of grants are determined by the Company’s Board of Directors. The ordinary shares underlying any options that are forfeited, canceled, repurchased or are otherwise terminated by the Company under the 2018 Plan are added back to the ordinary shares available for issuance under the 2018 Plan.

On December 5, 2018, pursuant to powers delegated to it by the Board of Directors of the Company, the Compensation Committee approved an increase in the number of ordinary shares available to be granted pursuant to the 2018 Plan by 4% of the total number of shares of the Company’s issued share capital on December 31, 2018, being 38,272 ordinary shares.

On February 14, 2020, pursuant to powers delegated to it by the Board of Directors of the Company, the Compensation Committee approved, by written resolution, an increase of 39,650 ordinary shares to the number of ordinary shares available to be granted pursuant to the 2018 Plan, being just under 4% of the total number of the Company’s ordinary shares outstanding on December 31, 2019, in accordance with the terms of the 2018 Plan.

On June 10, 2020, at the Company’s annual general meeting of shareholders, the shareholders approved and adopted an amended and restated 2018 Plan which, among other things included an increase of 150,000 ordinary shares to the number of ordinary shares reserved for issuance under the 2018 Plan.

On June 23, 2021, at the Company’s annual general meeting of shareholders, the shareholders approved an amendment to the amended and restated 2018 Plan to increase the number of ordinary shares reserved for issuance under the amended and restated 2018 Plan by 1,000,000 ordinary shares to 1,295,819 ordinary shares.

On November 24, 2021, the Company’s Board of Directors adopted and approved the 2021 Inducement Equity Incentive Plan (the 2021 Inducement Plan) reserving 333,333 of its ordinary shares to be used exclusively for grants of awards to individuals that were not previously employees or directors of the Company (or following such individuals’ bona fide period of non-employment with the company), as a material inducement to such individuals’ entry into employment with the company within the meaning of Rule 5635(c)(4) of the Nasdaq Listing Rules. The terms and conditions of the 2021 Inducement Plan are substantially similar to the 2018 Plan.

Share Options

Unless specified otherwise in an individual option agreement, share options granted under the 2015 Plan, the 2018 Plan and the 2021 Inducement Plan generally have a ten year term and a four year vesting period for employees and a one year vesting period for directors. The vesting requirement is conditioned upon a grantee’s continued service with the Company during the vesting period. Once vested, all awards are exercisable from the date of grant until they expire. The option grants are non-transferable. Vested options generally remain exercisable for 90 days subsequent to the termination of the option holder’s service with the Company. In the event of an option holder’s disability or death while employed by or providing service to the Company, the exercisable period extends to twelve months or eighteen months, respectively.

The fair value of options granted are estimated using the Black-Scholes option-pricing model. The inputs for the Black-Scholes model require significant management assumptions. The risk-free interest rate is based on a normalized estimate of the 7-year U.S. treasury yield. The Company has estimated the expected term utilizing the “simplified” method for awards that qualify as “plain vanilla”. The Company does not have sufficient company-specific historical and implied volatility information and it therefore estimates its expected share volatility based on historical volatility information of reasonably comparable guideline public companies and itself. The Company expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded share price. Expected dividend yield is based on the fact that the Company has never paid cash dividends and the Company’s future ability to pay cash dividends on its shares may be limited by the terms of any future debt or preferred securities. The Company has elected to account for forfeitures as they occur.

The Company granted 197,085, 1,028,090 and 4,322 share options to employees and directors during the years ended December 31, 2022, 2021 and 2020, respectively. There were 296,199, 1,033,820 and 17,778 unvested employee and director options outstanding as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively. Total expense recognized related to the employee and director share options was $3,580, $3,779, and $1,136, for the years ended December 31, 2022, 2021 and 2020, respectively. Total unamortized compensation expense related to employee and director share options was $929, $21,521 and $970 as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively, expected to be recognized over a remaining weighted average vesting period of 1.41 years, 3.49 years and 1.47 years as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively.

On July 7, 2022, certain of the Company's executive officers and employees agreed to the surrender and cancellation of certain previously granted share options for an aggregate of 906,800 ordinary shares in order to make additional shares available under the

137

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

2018 Plan. Total expense recognized in connection with the cancellation of these employee share options was $17,350 for the year ended December 31, 2022, and was recorded in other income and expense as Cancellation of Share Options.

The range of assumptions that the Company used to determine the grant date fair value of employee and director options granted were as follows:

	Year Ended December 31,
	2022	2021	2020
Volatility	100 - 130%	120 - 140%	90.3 - 99.5%
Expected term in years	5.50 - 6.25	5.50 - 6.25	5.50 - 6.25
Dividend rate	0%	0%	0%
Risk-free interest rate	1.90 - 3.96%	0.90 - 1.42%	0.18 - 0.78%
Share price	$0.81-$6.72	$0.48-$2.01	$1.68-$2.03
Fair value of option on grant date	$0.64-$5.95	$0.45-$1.75	$1.27-$1.52

The following table summarizes total stock option activity for all Company plans:

	Equity Plans	Inducement Plan	Total
Options outstanding December 31, 2019	76,636	—	76,636
Granted	4,322	—	4,322
Exercised	—	—	—
Forfeited	(9,260)	—	(9,260)
Expired	(8,267)	—	(8,267)
Options outstanding December 31, 2020	63,431	—	63,431
Granted	908,090	120,000	1,028,090
Exercised	—	—	—
Forfeited	—	—	—
Expired	(22,882)	—	(22,882)
Options outstanding December 31, 2021	948,639	120,000	1,068,639
Granted	190,753	6,332	197,085
Exercised	—	—	—
Forfeited	—	(3,333)	(3,333)
Cancelled Shares	(906,800)	—	(906,800)
Expired	—	—	—
Options outstanding December 31, 2022	232,592	122,999	355,591

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ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

The following table summarizes the total number of options outstanding and the weighted-average exercise price:

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value (in thousands)
Options outstanding December 31, 2019		76,636		$	118.79		8.59		254
Granted		4,322		$	25.36
Exercised		—
Forfeited		(9,260	)	$	129.07
Expired		(8,267	)	$	122.83
Options outstanding December 31, 2020		63,431		$	110.40		5.41		—
Granted		1,028,090		$	27.13
Exercised		—
Forfeited		—
Expired		(22,882	)	$	118.49
Options outstanding December 31, 2021		1,068,639		$	30.12		9.42		—
Granted		197,085		$	2.88
Exercised		—
Forfeited		(3,333	)	$	6.15
Cancelled Shares		(906,800	)	$	33.16
Expired		—
Options outstanding December 31, 2022		355,591		$	7.49		9.12		—
Exercisable at December 31, 2022		59,392		$	22.21		8.09

The aggregate intrinsic value of share options is calculated as the difference between the exercise price of the share options and the fair value of the Company’s ordinary shares for those share options that had exercise prices lower than the fair value of the Company’s ordinary shares as of December 31, 2022, December 31, 2021 and December 31, 2020.

The weighted average grant-date fair value per share of share options granted during the years ended December 31, 2022, 2021 and 2020 was $2.39, $23.67 and $19.17, respectively.

Restricted Share Units (RSUs)

The Company granted 66,398 RSUs to directors during the year ended December 31, 2022 and 123,017 RSUs to employees and directors during the year ended December 31, 2021. No RSUs were granted to employees or directors during the year ended December 31, 2020.

The following table summarizes the number of RSUs granted covering an equal number of the Company’s ordinary shares for all of our plans:

	Equity Plans	Inducement Plan	Total
RSUs outstanding December 31, 2019	2,090	—	2,090
Granted	—	—	—
Shares vested	(1,710)	—	(1,710)
Forfeited	(380)	—	(380)
RSUs outstanding December 31, 2020	—	—	—
Granted	89,684	33,333	123,017
Shares vested	(4,000)	—	(4,000)
Forfeited	—	—	—
RSUs outstanding December 31, 2021	85,684	33,333	119,017
Granted	66,398	—	66,398
Shares vested	(48,353)	(8,334)	(56,687)
Forfeited	—	—	—
RSUs outstanding December 31, 2022	103,729	24,999	128,728

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ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

The table below shows the total number of RSUs granted and the weighted-average grant date fair value of the total RSUs granted:

	Number of Shares			Weighted Average Grant Date Fair Value per Share
RSUs outstanding December 31, 2019		2,090		$	105.21
Granted		—
Shares vested		(1,710	)	$	105.21
Forfeited		(380	)	$	105.21
RSUs outstanding December 31, 2020		—
Granted		123,017		$	19.32
Shares vested		(4,000	)	$	24.00
Forfeited		—
RSUs outstanding December 31, 2021		119,017		$	19.16
Granted		66,398		$	2.91
Shares vested		(56,687	)	$	21.23
Forfeited		—
RSUs outstanding December 31, 2022		128,728		$	9.87

The fair value of the RSUs is determined on the date of grant based on the market price of the Company’s ordinary shares on that date. The fair value of RSUs is expensed ratably over the vesting period, which is generally one year for directors and two years for employees under our 2018 Plan and four years for employees under our 2021 Inducement Plan. Total expense recognized related to the RSUs was $1,178, $960 and $63 for the years ended December 31, 2022, 2021 and 2020, respectively. Total unamortized compensation expense related to the RSUs was $434 and $1,416 as of December 31, 2022 and December 31, 2021, respectively, and is expected to be recognized over a remaining average vesting period of 0.88 years and 1.89 years as of December 31, 2022 and December 31, 2021, respectively.

No RSUs, which are subject to certain performance-based vesting conditions (Performance RSUs), were awarded during the years ended December 31, 2022 and 2021. The Company awarded 71,927 RSUs to certain employees during the year ended December 31, 2020 which were subject to certain vesting conditions (Performance RSUs).

The table below shows the number of Performance RSUs granted covering an equal number of the Company’s ordinary shares and the weighted-average grant date fair value of the Performance RSUs granted:

	Number of Shares			Weighted Average Grant Date Fair Value per Share
Performance RSUs outstanding December 31, 2019		3,326		$	123.15
Granted		71,927		$	30.71
Shares vested		—
Forfeited		(9,726	)	$	45.75
Performance RSUs outstanding December 31, 2020		65,527		$	33.18
Granted		—
Shares vested		(41,961	)	$	30.90
Expired		(1,733	)	$	29.85
Forfeited		(21,833	)	$	123.15
Performance RSUs outstanding December 31, 2021		—

The weighted average grant date fair value of Performance RSUs with a market condition was determined using the Monte Carlo simulation model. The fair value of Performance RSUs is expensed ratably over the vesting period. Due to the expiration of Performance RSUs, a credit of $0 was recognized for the year ended December 31, 2021. Total expense recognized related to Performance RSUs was $1,560 for the year ended December 31, 2020. All Performance RSUs were fully expensed as of December 31, 2021. Total unamortized compensation expense related to Performance RSUs was $152 for the year ended December 31, 2020, expected to be recognized over a remaining average vesting period of 0.20 years as of December 31, 2020.

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ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

The Company’s share-based compensation expense was classified in the consolidated statements of operations and comprehensive loss as follows:

	Year ended December 31,
	2022		2021		2020
Research and development expense	$	1,396	$	1,322	$	754
General and administrative expense		3,362		2,997		2,005

There was a total of $1,363, $22,937 and $1,122 unamortized share-based compensation expense for share options, restricted share units and performance restricted share units as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively, expected to be recognized over a remaining average vesting period of 1.28 years, 3.32 years and 0.80 years as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively.

(14)Income Taxes

During the years ended December 31, 2022, 2021 and 2020, the Company recorded no income tax benefits for the net operating losses incurred in each year due to its uncertainty of realizing a benefit from those items.

The provision for income taxes consists of the following components:

	Year Ended December 31,
	2022		2021		2020
Current
U.S.	$	301	$	705	$	743
Ireland		—		—		—
Total Current	$	301	$	705	$	743
Deferred
U.S.	$	—	$	—	$	—
Ireland		—		—		—
Total Deferred	$	—	$	—	$	—
Income Tax Provision	$	301	$	705	$	743

Income taxes have been based on the following components of income (loss) before provision for income taxes:

	Year Ended December 31,
	2022			2021			2020
U.S.	$	(13,701	)	$	(34	)	$	696
Ireland		(30,432	)		(90,825	)		(51,959	)
Total	$	(44,133	)	$	(90,859	)	$	(51,263	)

The Irish federal statutory rate is reconciled to the effective tax rate as follows:

	Year Ended December 31, 2022		Year Ended December 31, 2021		Year Ended December 31, 2020
Statutory rate	12.50%	$(5,517)	12.50%	$(11,357)	12.50%	$(6,408)
Impact of U.S. tax rate	4.71%	(2,080)	0.01%	(5)	(0.20)%	105
Impact of valuation allowance	(5.30)%	2,341	(3.64)%	3,304	(6.47)%	3,319
Research and development tax credit	0.00%	—	0.00%	—	0.14%	(71)
Adjustments for current tax of prior periods	(4.19)%	1,851	0.14%	(131)	(1.94)%	995
Cancellation of share options	(9.02)%	3,983	0.00%	—	0.00%	—
Fair value movements on derivative financial instruments	1.55%	(682)	(8.37)%	7,603	(4.34)%	2,227
Other, net	(0.92)%	405	(1.42)%	1,292	(1.13)%	577
Effective tax rate	(0.68)%	$301	(0.78)%	$705	(1.44)%	$743

141

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

The significant components of the Company’s deferred tax assets and liabilities are as follows:

	Year Ended December 31,
	2022			2021			2020
Deferred tax assets
Share-based compensation	$	438		$	822		$	650
Depreciation		42			127			31
Net operating loss carryforwards		36,059			33,218			30,261
Other		(11	)		120			41
Valuation allowance		(36,528	)		(34,287	)		(30,983	)
Total deferred tax assets	$	—		$	—		$	—
Deferred tax liabilities		—			—			—
Net deferred tax asset	$	—		$	—		$	—

As a company incorporated in Ireland, it is principally subject to taxation in Ireland.

The Company has net operating loss carryforwards in Ireland of approximately $36,059, $33,218 and $30,261 as of the years ended December 31, 2022, 2021 and 2020, respectively, for which a full valuation allowance has been recognized as it was determined that it is more-likely-than-not that these net deferred tax assets will not be realized. The net operating loss carryforwards do not expire, but are carried forward indefinitely. Realization of these deferred tax assets is dependent on the generation of sufficient taxable income. If the Company demonstrates consistent profitability in the future, the evaluation of the recoverability of these deferred tax assets may change and the remaining valuation allowance may be released in part or in whole. While management expects to realize the deferred tax assets, net of valuation allowances, changes in estimates of future taxable income or in tax laws may alter this expectation.

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows:

	2022			2021
Balance at January 1	$	3,300		$	3,024
(Decrease) / Increase in tax positions		(456	)		276
Balance at December 31	$	2,844		$	3,300

The Company's federal and state income tax returns for 2019 through 2021 remain open to examination by the IRS. The Company's income tax returns in Ireland remain open to examination from 2018 to 2021. The Company is not currently subject to any audits or examination.

In August 2022, the Inflation Reduction Act of 2022 ("IRA") was signed into law in the United States. The IRA created a new corporate alternative minimum tax of 15% on adjusted financial statement income and an excise tax of 1% of the value of certain stock repurchases. The provisions of the IRA will be effective for periods beginning after December 31, 2022. The enactment of the IRA did not result in any material adjustments to the Company's income tax provisions or net deferred tax assets as of December 31, 2022.
 

(15)Commitments and Contingencies

License Agreement

On November 18, 2015, the Company entered into a license agreement with Pfizer for the worldwide exclusive rights to research, develop, manufacture and commercialize sulopenem.

As part of the license agreement, the Company is obligated to pay Pfizer potential future regulatory milestone payments, as well as sales milestones upon achievement of net sales ranging from $250.0 million to $1.0 billion for each product type. The Company is also obligated to pay Pfizer royalties ranging from a single-digit to mid-teens percentage based on marginal net sales of each licensed product.

142

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

Royalty-Linked Notes

On January 21, 2020, as part of the Private Placement, the Company issued 2,579,400 RLNs to a group of accredited investors. On September 8, 2020, as part of the Rights Offering, the Company issued 11,000 RLNs to existing shareholders. The RLNs will entitle the holders thereof to payments, at the applicable payment rate, based solely on a percentage of the Company’s net revenues from U.S. sales of specified sulopenem products earned through December 31, 2045, but will not entitle the holders thereof to any payments unless the Company receives FDA approval for one or more specified sulopenem products prior to December 31, 2025 and the Company earns net revenues on such product. If any portion of the principal amount of the outstanding RLNs, equal to $0.04 per RLN, has not been paid as of the end date on December 31, 2045 (or December 31, 2025, in the event that the Company has not yet received FDA approval with respect to one or more specified sulopenem products by such date), Iterum Bermuda must pay the unpaid portion of the principal amount. The RLNs will earn default interest if the Company breaches certain obligations under the RLN Indenture (but do not otherwise bear interest) and will be subject to a maximum return amount, including all principal and payments and certain default interest in respect of uncurable defaults, of $160.00 (or 4,000 times the principal amount of such note). The RLNs will be redeemable at the Company’s option, subject to the terms of the RLN Indenture.

Legal Proceedings

On August 5, 2021, a putative class action lawsuit was filed against the Company, its Chief Executive Officer and Chief Financial Officer in the United States District Court for the Northern District of Illinois. The complaint was purported to be brought on behalf of shareholders who purchased the Company's securities between November 30, 2020 and July 26, 2021. The complaint generally alleged that the defendants violated Section 10(b) and/or 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder by making purportedly material misstatements or omissions concerning the Company’s submission of its NDA to the FDA for marketing approval of oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen and the likelihood of such approval. The complaint sought, among other things, unspecified damages, attorneys' fees, expert fees and other costs. The court appointed a lead plaintiff and approved plaintiff’s selection of lead counsel on November 3, 2021. On January 26, 2022, plaintiff filed an amended complaint which included allegations similar to those made in the original complaint and sought similar relief. On April 8, 2022, the Company filed a motion to dismiss with the court seeking dismissal of all claims asserted. Oral argument on the motion to dismiss occurred on August 17, 2022. On December 28, 2022, the count granted the Company's motion to dismiss without prejudice giving the plaintiffs until January 24, 2023 to file an amended complaint. As no amended complaint was filed, the dismissal was converted to a dismissal with prejudice on January 25, 2023.

Other Contingencies

Liabilities for loss contingencies arising from claims, assessments, litigation, fines, penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. At each reporting date the Company evaluates whether or not a potential loss amount or a potential loss range is probable and reasonably estimable under the provisions of the authoritative guidelines that address accounting for contingencies. The Company expenses costs as incurred in relation to such legal proceedings. The Company has no contingent liabilities in respect of legal claims arising in the ordinary course of business.

Under the terms of their respective employment agreements, each of the named executive officers is eligible to receive severance payments and benefits upon a termination without “cause” (other than due to death or disability) or upon “resignation for good reason”, contingent upon the named executive officer’s continued performance for the Company. Under the terms of the Employee Severance Plan approved by the Compensation Committee in January 2022, an employee, who is not an executive officer of the Company, is entitled to severance pay and benefits on a "qualifying termination", that is termination at any time during the period beginning on the date that is 30 days prior to and ending on the date that is 12 months following a change of control without "cause" (other than due to death or disability) based on the employee's level/salary grade.

(16)Condensed Consolidating Financial Statements

On January 21, 2020, the Company completed a Private Placement pursuant to which its wholly owned subsidiary, Iterum Bermuda, issued and sold $51,588 aggregate principal amount of Exchangeable Notes and $103 aggregate principal amount of RLNs to a group of accredited investors. On September 8, 2020, the Company completed a Rights Offering pursuant to which Iterum Bermuda issued and sold $220 aggregate principal amount of Exchangeable Notes and $0.44 aggregate principal amount of RLNs to existing shareholders. The Securities were sold in Units with each Unit consisting of an Exchangeable Note in the original principal amount of $1,000 and 50 RLNs. As of December 31, 2022, $12,607 million aggregate principal amount of Exchangeable Notes and all RLNs remained outstanding.

The Units were issued by Iterum Bermuda, which was formed on November 6, 2019 and is a 100% owned “finance subsidiary” of the Company under Rule 3-10 of Regulation S-X with no independent function and no assets or operations other than those related

143

ITERUM THERAPEUTICS PLC

Notes to Consolidated Financial Statements

(In thousands, except share and per share data)

to the issuance, administration and repayment of the Exchangeable Notes and RLNs. Iterum Therapeutics plc, as the parent company, has no independent assets or operations, and its operations are conducted solely through its subsidiaries. The assets, liabilities and results of operations of the Company, Iterum Bermuda and Iterum Therapeutics International Limited, Iterum Therapeutics US Holding Limited and Iterum Therapeutics US Limited (the Subsidiary Guarantors) are not materially different than the corresponding amounts presented in the consolidated financial statements of this Annual Report on Form 10-K. The Company and the Subsidiary Guarantors have provided a full and unconditional guarantee of Iterum Bermuda’s obligations under the Exchangeable Notes and the RLNs, and each of the guarantees constitutes the joint and several obligations of the applicable guarantor. The Subsidiary Guarantors are 100% directly or indirectly owned subsidiaries of the Company. There are no significant restrictions upon the Company’s or the Subsidiary Guarantors’ ability to obtain funds from their subsidiaries by dividend or loan. None of the assets of Iterum Bermuda or the Subsidiary Guarantors represent restricted net assets pursuant to Rule 4-08(e)(3) of Regulation S-X.

(17) Subsequent Events

The Company considers events and transactions that occur after the balance sheet date but prior to the issuance of the consolidated financial statements for potential recognition and disclosure in the consolidated financial statements.

The Company has a banking relationship with SVB. On March 10, 2023, SVB was closed by the California Department of Financial Protection and Innovation, which appointed the FDIC as receiver. On March 12, 2023, the Federal Reserve Board approved actions enabling the FDIC to complete its resolution of SVB in a manner that fully protects all depositors. Based on the foregoing and the Company's analysis of the components of its relationship with SVB, the Company does not expect these events to have a material impact on the Company's consolidated financial statements.

144

Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer (our principal executive officer and principal financial officer, respectively), evaluated the effectiveness of our disclosure controls and procedures as of December 31, 2022. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of December 31, 2022, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Our internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. However, these inherent limitations are known features of the financial reporting process. Therefore, it is possible to design into the process safeguards to reduce, though not eliminate, this risk.

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer (our principal executive officer and principal financial officer, respectively), we conducted an evaluation of the effectiveness of our internal control over financial reporting. We used the 2013 framework in Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission to evaluate the effectiveness of our internal control over financial reporting. Based on our evaluation under that framework, our management has concluded that our internal control over financial reporting was effective as of December 31, 2022.

Our independent registered public accounting firm has not performed an evaluation of our internal control over financial reporting during any period in accordance with the provisions of the Sarbanes-Oxley Act. For as long as we remain an “emerging growth company” as defined in Rule 12b-2 of the Exchange Act, we intend to take advantage of the exemption permitting us not to comply with the requirement that our independent registered public accounting firm provide an attestation on the effectiveness of our internal control over financial reporting. We are also a "smaller reporting company" as defined in Rule 12b-2 promulgated under the Exchange Act. We may remain a smaller reporting company until we have a non-affiliate public float in excess of $250 million and annual revenues in excess of $100 million, or a non-affiliate public float in excess of $700 million, each as determined on an annual basis. Even after we no longer qualify as an "emerging growth company", we may still qualify as a smaller reporting company, which would allow us to take advantage of many of these same exemptions from disclosure requirements as those allowed for an emerging growth company.

Changes in Internal Control Over Financial Reporting

No change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the quarter ended December 31, 2022, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Item 9B. Other Information.

None.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections.

Not applicable.

145

146

PART III

Item 10. Directors, Executive Officers and Corporate Governance.

The information required by this item is incorporated herein by reference to the information set forth in the sections titled “Management and Corporate Governance Matters—Board of Directors—Continuing Members of and Current Member who is Nominated for Election to our Board of Directors,” “Management and Corporate Governance Matters—Executive Officers,” “Management and Corporate Governance Matters—Board Processes—Director Nomination Process,” “Management and Corporate Governance Matters—Committees of our Board of Directors—Audit Committee,” and “Delinquent Section 16(a) Reports,” if applicable, in our definitive Proxy Statement to be filed in connection with our 2023 Annual General Meeting of Shareholders (2023 Proxy Statement), which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022.

We have adopted a written Code of Business Conduct and Ethics that applies to all officers, directors and employees, including our principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions. The Code of Business Conduct and Ethics is available on our website at www.iterumtx.com. If we make any substantive amendments to the Code of Business Conduct and Ethics or grant any waiver from a provision of the Code of Business Conduct and Ethics to any executive officer or director, we will promptly disclose the nature of the amendment or waiver on our website or in a Current Report on Form 8-K.

Item 11. Executive Compensation.

The information required by this item is incorporated herein by reference to the information set forth in the sections titled “Executive Officer and Director Compensation” and “Management and Corporate Governance Matters—Board Processes—Compensation Committee Interlocks and Insider Participation” in our 2023 Proxy Statement.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters.

The information required by this item is incorporated herein by reference to the information set forth in the sections titled “Share Ownership of Certain Beneficial Owners and Management” and “Equity Compensation Plans and Other Benefit Plans” in our 2023 Proxy Statement.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The information required by this item is incorporated herein by reference to the information set forth in the sections titled “Management and Corporate Governance Matters—Board of Directors—Board Determination of Independence” and “Certain Relationships and Related Party Transactions” in our 2023 Proxy Statement.

Item 14. Principal Accounting Fees and Services.

The information required by this item is incorporated herein by reference to the information set forth in the section titled “Matters to Come Before the Annual General Meeting—Proposal No. 2: To Ratify, in a Non-Binding Vote, the Appointment of KPMG to Serve as our Independent Registered Public Accounting Firm for the Fiscal Year Ended December 31, 2023 and to Authorize the Board of Directors, Acting Through the Audit Committee, to Set the Independent Registered Public Accounting Firm’s Remuneration” in our 2023 Proxy Statement.

147

PART IV

Item 15. Exhibits and Financial Statement Schedules.

(1)Consolidated Financial Statements

See Index to Consolidated Financial Statements at Item 8 herein.

(2)Financial Statement Schedules

All schedules are omitted because they are not applicable or the required information is shown in the consolidated financial statements or notes thereto.

(3)Exhibits

The following is a list of exhibits filed or furnished as part of this Annual Report on Form 10-K;

Exhibit No.	Description of Document	Filed with this report	Incorporated by Reference herein from Form or Schedule	Filing Date	SEC File Number
3.1	Amended and Restated Constitution of Iterum Therapeutics plc		Form 8-K (Exhibit 3.1)	August 19, 2022	001-38503
3.2	Memorandum of Association of Iterum Therapeutics Bermuda Limited		Form S-1 (Exhibit 3.2)	March 20, 2020	333-237326
3.3	Bye-Laws of Iterum Therapeutics Bermuda Limited		Form S-1 (Exhibit 3.3)	March 20, 2020	333-237326
3.4	Constitution of Iterum Therapeutics International Limited		Form 10-K (Exhibit 3.4)	March 12, 2021	001-38503
3.5	Amended and Restated Certificate of Incorporation of Iterum Therapeutics US Limited		Form 10-K (Exhibit 3.5)	March 12, 2021	001-38503
3.6	Bylaws of Iterum Therapeutics US Limited		Form 10-K (Exhibit 3.6)	March 12, 2021	001-38503
3.7	Certificate of Amendment of Certificate of Incorporation of Iterum Therapeutics US Holding Limited		Form 10-K (Exhibit 3.7)	March 12, 2021	001-38503
3.8	Bylaws of Iterum Therapeutics US Holding Limited		Form 10-K (Exhibit 3.8)	March 12, 2021	001-38503
4.1	Form of Ordinary Share Certificate of Registrant.		Form S-1 (Exhibit 4.1)	May 1, 2018	333-224582

148

4.2	Indenture (including form of note), dated January 21, 2020, by and among Iterum Therapeutics Bermuda Limited, Iterum Therapeutics plc, Iterum Therapeutics International Limited, Iterum Therapeutics US Limited, Iterum Therapeutics US Holding Limited and U.S. Bank National Association, as trustee.	Form 10-K (Exhibit 4.2)	March 12, 2020	001-38503
4.3	Form of 6.500% Exchangeable Senior Subordinated Note due 2025 (included within Exhibit 4.2).	Form 10-K (Exhibit 4.3)	March 12, 2020	001-38503
4.4	Indenture (including form of note), dated January 21, 2020, by and among Iterum Therapeutics Bermuda Limited, Iterum Therapeutics plc, Iterum Therapeutics International Limited, Iterum Therapeutics US Limited, Iterum Therapeutics US Holding Limited, Iterum Holders’ Representative LLC and Computershare Trust Company, N.A., as trustee.	Form 10-K (Exhibit 4.4)	March 12, 2020	001-38503
4.5	Form of Limited Recourse Royalty-Linked Subordinated Note (included within Exhibit 4.4).	Form 10-K (Exhibit 4.5)	March 12, 2020	001-38503
4.6	Form of Warrant to Subscribe for Ordinary Shares issued to purchasers in connection with Securities Purchase Agreement dated June 3, 2020	Form 8-K (Exhibit 4.1)	June 04, 2020	001-38503
4.7	Form of Placement Agent Warrant to Subscribe for Ordinary Shares issued to designees of H.C. Wainwright & Co., LLC in connection with Securities Purchase Agreement dated June 3, 2020	Form 8-K (Exhibit 4.2)	June 04, 2020	001-38503
4.8	Form of Warrant to Subscribe for Ordinary Shares issued to purchasers in connection with Securities Purchase Agreement dated June 30, 2020	Form 8-K (Exhibit 4.1)	July 01, 2020	001-38503

149

4.9	Form of Placement Agent Warrant to Subscribe for Ordinary Shares issued to designees of H.C. Wainwright & Co., LLC in connection with Securities Purchase Agreement dated June 30, 2020		Form 8-K (Exhibit 4.2)	July 01, 2020	001-38503
4.10	Form of Ordinary Share Purchase Warrant to Subscribe for Ordinary Shares issued to purchasers in connection with the Securities Purchase Agreement dated October 22, 2020		Form 8-K (Exhibit 4.1)	October 27, 2020	001-38503
4.11	Form of Pre-Funded Ordinary Share Purchase Warrant to Subscribe for Ordinary Shares issued to purchasers in connection with the Securities Purchase Agreement dated October 22, 2020		Form 8-K (Exhibit 4.2)	October 27, 2020	001-38503
4.12	Form of Placement Agent Ordinary Share Purchase Warrant to Subscribe for Ordinary Shares issued to designees of H.C. Wainwright & Co., LLC in connection with the Placement Agent Agreement dated October 22, 2020		Form 8-K (Exhibit 4.3)	October 27, 2020	001-38503
4.13	Form of Underwriter Warrant to subscribe for ordinary shares issued to designees of H.C. Wainwright & Co., LLC in connection with the Amended and Restated Underwriting Agreement dated February 3, 2021		Form 8-K (Exhibit 4.1)	February 5, 2021	001-38503
4.14	Form of Placement Agent Warrant to Subscribe for Ordinary Shares issued to designees of H.C. Wainwright & Co., LLC in connection with Securities Purchase Agreement dated February 9, 2021		Form 8-K (Exhibit 4.1)	February 11, 2021	001-38503
4.15	Description of Registrant's Securities	X
10.1†	License Agreement by and among Registrant, Iterum Therapeutics International Limited and Pfizer Inc. dated as of November 18, 2015.		Form S-1 (Exhibit 10.1)	May 1, 2018	333-224582

150

10.2	Amended and Restated Investor Rights Agreement by and between Registrant and certain of its shareholders dated May 18, 2017.	Form S-1 (Exhibit 10.2)	May 1, 2018	333-224582
10.3	2015 Equity Incentive Plan, as amended	Form 10-Q (Exhibit 10.1)	November 10, 2022	001-38503
10.4	Forms of U.S. Stock Option Agreement, Stock Option Grant Notice and Notice of Exercise under the 2015 Equity Incentive Plan.	Form S-1 (Exhibit 10.4)	May 1, 2018	333-224582
10.5	Forms of Irish Stock Option Agreement, Stock Option Grant Notice and Notice of Exercise under the 2015 Equity Incentive Plan.	Form S-1 (Exhibit 10.5)	May 1, 2018	333-224582
10.6	Amended and Restated 2018 Equity Incentive Plan, as amended	Form 10-Q (Exhibit 10.2)	November 10, 2022	001-38503
10.7	Forms of U.S. Stock Option Terms and Conditions and Stock Option Grant Notice under the 2018 Equity Incentive Plan.	Form S-1 (Exhibit 10.7)	May 1, 2018	333-224582
10.8	Forms of International Stock Option Terms and Conditions and Stock Option Grant Notice under the 2018 Equity Incentive Plan.	Form S-1 (Exhibit 10.8)	May 1, 2018	333-224582
10.9	Form of Restricted Share Unit Award Agreement under the 2018 Equity Incentive Plan.	Form S-1 (Exhibit 10.9)	May 1, 2018	333-224582
10.10	Form of 2020 Restricted Share Unit Award Agreement under the 2018 Equity Incentive Plan.	Form 10-K (Exhibit 10.10)	March 12, 2020	001-38503
10.11	Form of Indemnity Agreement by and between the Registrant and its directors and officers.	Form S-1 (Exhibit 10.10)	May 1, 2018	333-224582
10.12	Form of Indemnity Agreement by and between Iterum Therapeutics US Limited and its directors and officers.	Form S-1 (Exhibit 10.11)	May 1, 2018	333-224582
10.13+	Employment Terms by and between Iterum Therapeutics US Limited and Corey N. Fishman dated November 18, 2015.	Form S-1 (Exhibit 10.12)	May 1, 2018	333-224582
10.14+	Amendment to Employment Agreement by and between Iterum Therapeutics US Limited and Corey N. Fishman dated May 2, 2018.	Form S-1/A (Exhibit 10.13)	May 4, 2018	333-224582

151

10.15+	Employment Terms by and between Iterum Therapeutics US Limited and Judith M. Matthews dated November 18, 2015.		Form S-1 (Exhibit 10.15)	May 1, 2018	333-224582
10.16+	Amendment to Employment Agreement by and between Iterum Therapeutics US Limited and Judith M. Matthews dated May 2, 2018.		Form S-1/A (Exhibit 10.16)	May 4, 2018	333-224582
10.17+	Consulting Agreement dated May 25, 2022 between Iterum Therapeutics International Limited and Dr. Michael Dunne		Form 10-Q (Exhibit 10.1)	August 12, 2022	001-38503
10. 18	Amendment to Consulting Agreement dated December 31, 2022 between Iterum Therapeutics International Limited and Dr. Michael Dunne	X
10.19+	Share Award Letter dated February 17, 2021 issued by Iterum Therapeutics plc to Dr. Michael Dunne and accepted by Dr. Michael Dunne on February 21, 2021		Form 10-Q (Exhibit 10.2)	May 14, 2021	001-38503
10.20+	Employment Terms by and between Iterum Therapeutics US Limited and Dr. Sailaja Puttagunta dated October 27, 2021		Form 10-K (Exhibit 10.19)	March 28, 2022	001-38503
10.21+	Amended and Restated Non-Employee Director Compensation Policy		Form 8-K (Exhibit 10.1)	March 16, 2021	001-38503
10.22	Warrant to Subscribe for Shares, issued to Silicon Valley Bank, dated April 27, 2018.		Form S-1/A (Exhibit 10.21)	May 4, 2018	333-224582
10.23	Warrant to Subscribe for Shares, issued to Life Sciences Fund II LLC, dated April 27, 2018.		Form S-1/A (Exhibit 10.22)	May 4, 2018	333-224582
10.24	Securities Purchase Agreement, dated as of January 16, 2020, by and among Iterum Therapeutics Bermuda Limited, Iterum Therapeutics plc, Iterum Therapeutics International Limited, Iterum Therapeutics US Limited, Iterum Therapeutics US Holding Limited and the Investors party thereto.		Form 8-K (Exhibit 10.1)	January 17, 2020	001-38503

152

10.25	Investor Rights Agreement, dated January 21, 2020, by and among Iterum Therapeutics Bermuda Limited, Iterum Therapeutics plc, Iterum Therapeutics International Limited, Iterum Therapeutics US Limited, Iterum Therapeutics US Holding Limited and the Investors party thereto.	Form 10-K (Exhibit 10.26)	March 12, 2020	001-38503
10.26	Securities Purchase Agreement, dated as of June 3, 2020, by and among Iterum Therapeutics plc and the purchasers party thereto	Form 10-Q (Exhibit 10.1)	August 6, 2020	001-38503
10.27	Securities Purchase Agreement, dated as of June 30, 2020, by and among Iterum Therapeutics plc and the purchasers party thereto	Form 10-Q (Exhibit 10.2)	August 6, 2020	001-38503
10.28	Securities Purchase Agreement, dated as of October 22, 2020, by and among Iterum Therapeutics plc and the purchasers party thereto	Form 10-Q (Exhibit 10.1)	November 16, 2020	001-38503
10.29	Securities Purchase Agreement, dated as of February 9, 2021, by and among Iterum Therapeutics plc and the purchasers party thereto	Form 10-K (Exhibit 10.28)	March 12, 2021	001-38503
10.30	Iterum Therapeutics plc 2021 Inducement Equity Incentive Plan, as amended	Form 10-Q (Exhibit 10.3)	November 10, 2022	001-38503
10.31	Form of US Nonstatuory Share Option Terms and Conditions and Nonstatutory Share Option Grant Notice under the 2021 Inducement Equity Incentive Plan	Form S-8 (Exhibit 99.2)	December 9, 2021	333-261558
10.32	Form of International Nonstatutory Share Option Terms and Conditions and Nonstatutory Share Option Grant Notice under the 2021 Inducement Equity Incentive Plan	Form S-8 (Exhibit 99.3)	December 9, 2021	333-261558
10.33	Form of Restricted Share Unit Award Agreement under the 2021 Inducement Equity Incentive Plan	Form S-8 (Exhibit 99.4)	December 9, 2021	333-261558
10.34	At the Market Offering Agreement, dated October 7, 2022 by and between Iterum Therapeutics plc and H.C. Wainwright & Co., LLC	Form S-3 (Exhibit 1.2)	October 7, 2022	333-267795
10.35	Share Option Cancellation Agreement, dated July 7, 2022, between Iterum Therapeutics plc and Corey N. Fishman	Form 10-Q (Exhibit 10.2)	August 12, 2022	001-38503
10.36	Share Option Cancellation Agreement, dated July 7, 2022,	Form 10-Q (Exhibit 10.3)	August 12, 2022	001-38503

153

	between Iterum Therapeutics plc and Judith M. Matthews
21.1	Subsidiaries of the Registrant		Form 10-K (Exhibit 21.1)	March 12, 2020	001-38503
22.1	Subsidiary Guarantors and Subsidiary Issuers		Form 10-K (Exhibit 22.1)	March 12, 2021	001-38503
23.1	Consent of KPMG, Independent Registered Public Accounting Firm	X
31.1	Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002	X
31.2	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002	X
32.1	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	X
32.2	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	X
101.INS	Inline XBRL Instance Document	X
101.SCH	Inline XBRL Taxonomy Extension Schema Document	X
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document	X
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document	X
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document	X
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document	X

154

104	Cover Page Interactive Data File (formatted as Inline XBRL with applicable taxonomy extension information contained in Exhibits 101)	X
_____________
+	Indicates management contract or compensatory plan.
†	Confidential treatment has been granted for certain provisions omitted from this Exhibit pursuant to Rule 406 promulgated under the Securities Act. The omitted information has been filed separately with the Securities and Exchange Commission.

155

156

Item 16. Form 10-K Summary

None.

157

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

	ITERUM THERAPEUTICS PLC
Date: March 16, 2023	By:	/s/ Corey N. Fishman
		Corey N. Fishman
		President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this Report has been signed below by the following persons on behalf of the Registrant in the capacities and on the dates indicated.

SIGNATURE	TITLE	DATE
/s/ Corey N. Fishman Corey N. Fishman	President and Chief Executive Officer (Principal Executive Officer)	March 16, 2023
/s/ Judith M. Matthews Judith M. Matthews	Chief Financial Officer (Principal Financial and Accounting Officer)	March 16, 2023
/s/ Brenton K. Ahrens Brenton K. Ahrens	Director	March 16, 2023
/s/ Mark Chin Mark Chin	Director	March 16, 2023
/s/ Michael Dunne Michael Dunne M.D.	Director	March 16, 2023
/s/ Ronald M. Hunt Ronald M. Hunt	Director	March 16, 2023
/s/ David G. Kelly David G. Kelly	Director	March 16, 2023
/s/ Beth Hecht Beth Hecht	Director	March 16, 2023

158

EX-4

Exhibit 4.15

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934

Iterum Therapeutics plc (“we”, “us” or the “Company”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our Ordinary Shares, $0.01 par value per share.

DESCRIPTION OF SHARE CAPITAL

The following description of our share capital is intended as a summary only and therefore is not a complete description of our share capital. This description is based upon, and is qualified by reference to, our Memorandum and Articles of Association (our “Constitution”), and applicable provisions of the Irish Companies Act 2014 (the “Irish Companies Act”). You should read our Constitution including our Articles of Association, which are filed as an exhibit to the Annual Report on Form 10-K of which this exhibit is a part, for the provisions that are important to you.

Capital Structure—Authorized Share Capital

Our authorized share capital consists of 20,000,000 ordinary shares of $0.01 each and 100,000,000 undesignated preferred shares of $0.01 each.

We may issue shares subject to the maximum authorized share capital contained in our Constitution. The authorized share capital may be increased or reduced (but not below the number of issued ordinary shares or preferred shares, as applicable) by a resolution approved by a simple majority of the votes of our shareholders cast at a general meeting (referred to under Irish law as an “ordinary resolution”) (unless otherwise determined by the directors). The shares comprising our authorized share capital may be divided into shares of any nominal value.

The rights and restrictions to which the ordinary shares are subject are prescribed in our Articles of Association. Our Articles of Association entitle our board of directors, without shareholder approval, to determine the terms of our preferred shares. Preferred shares may be preferred as to dividends, rights upon liquidation or voting in such manner as our board of directors may resolve. The preferred shares may also be redeemable at the option of the holder of the preferred shares or at our option and may be convertible into or exchangeable for shares of any of our other class or classes, depending on the terms of such preferred shares.

Irish law does not recognize fractional shares held of record. Accordingly, our Articles of Association do not provide for the issuance of fractional shares, and our official Irish register will not reflect any fractional shares.

Whenever an alteration or reorganization of our share capital would result in any of our shareholders becoming entitled to fractions of a share, our board of directors may, on behalf of those shareholders that would become entitled to fractions of a share, arrange for the sale of the shares representing fractions and the distribution of the net proceeds of sale in due proportion among the shareholders who would have been entitled to the fractions.

Issuance of Shares

As a matter of Irish law, the board of directors of a company may issue authorized but unissued new shares without shareholder approval once authorized to do so by the Articles of Association of the company or by an ordinary resolution adopted by the shareholders at a general meeting. The authority conferred can be granted for a maximum period of five years, at which point it must be renewed by the shareholders by an ordinary resolution. Our board of directors is authorized pursuant to a shareholder resolution passed on January 28, 2021 to issue new ordinary or preferred shares up to the amount of the authorized but unissued share capital at that date without shareholder approval, with such authority expiring on January 26, 2026.

Pre-emption Rights, Share Warrants and Share Options

Under Irish law certain statutory pre-emption rights apply automatically in favor of shareholders where shares, warrants, convertible instruments or options are to be issued for cash. However, we have opted out of these pre-emption rights by way of shareholder resolution passed on January 28, 2021 as permitted under Irish company law. Irish law requires this opt-out to be renewed every five years by a resolution approved by not less than 75% of the votes of our shareholders cast at a general meeting (referred to under Irish law as a “special resolution”) and our current opt-out will expire on January 26, 2026. If the opt-out is not renewed, shares issued for cash must be offered to our existing shareholders on a pro rata basis to their existing shareholding before the shares can be issued to any new shareholders. The statutory pre-emption rights do not apply where shares are issued for non-cash consideration (such as in a share-for-share acquisition) and do not apply to the issue of non-equity shares (that is, shares that have the right to participate only up to a specified amount in any income or capital distribution) or where shares are issued pursuant to an employee share option or similar equity plan.

Our Articles of Association provide that, subject to any shareholder approval requirement under any laws, regulations or the rules of any stock exchange to which we are subject, the board of directors is authorized, from time to time, in its discretion, to grant such persons, for such periods and upon such terms as the board of directors deems advisable, options to purchase such number of shares of any class or classes or of any series of any class as the board of directors may deem advisable, and to cause warrants or other appropriate instruments evidencing such options to be issued. The Irish Companies Act provides that directors may issue share warrants or options without shareholder approval once authorized to do so by the Articles of Association. We are subject to the rules of the Nasdaq Capital Market that require shareholder approval of certain equity plans and share issuances. Our board of directors may authorize the issuance of shares upon exercise of warrants or options without shareholder approval or authorization (up to the relevant authorized share capital limit).

Under Irish law, we are prohibited from allotting shares without consideration. Accordingly, at least the nominal value of the shares issued underlying any restricted share award, restricted share unit, performance share award, bonus share or any other share based grant must be paid pursuant to the Irish Companies Act.

Dividends

Under Irish law, dividends and distributions may only be made from distributable reserves. Distributable reserves, broadly, means the accumulated realized profits of a company, so far as not previously utilized by distribution or capitalization, less accumulated realized losses of a company, so far as not previously written off in a reduction or reorganization of capital, and includes reserves created by way of capital reduction, on a standalone basis. In addition, no distribution or dividend may be made unless our net assets are equal to, or in excess of, the aggregate of our called up share capital plus undistributable reserves and the distribution does not reduce our net assets below such aggregate. Undistributable reserves include the undenominated capital, the amount by which our accumulated unrealized profits, so far as not previously utilized by any capitalization, exceed our accumulated unrealized losses, so far as not previously written off in a reduction or reorganization of capital and any other reserve that we are prohibited from distributing by applicable law.

The determination as to whether or not we have sufficient distributable reserves to fund a dividend must be made by reference to the “relevant financial statements” of the Company. The “relevant financial statements” are either the last set of unconsolidated annual audited financial statements or unaudited financial statements properly prepared in accordance with the Irish Companies Act, which give a “true and fair view” of the Company’s unconsolidated financial position in accordance with accepted accounting practice in Ireland. The “relevant financial statements” must be filed in the Companies Registration Office (the official public registry for companies in Ireland) prior to the making of the distribution.

Consistent with Irish law, our Articles of Association authorize the directors to declare interim dividends without shareholder approval out of funds lawfully available for the purpose, to the extent they appear justified by profits and subject always to the requirement to have distributable reserves at least equal to the amount of the proposed dividend. The board of directors may also recommend a dividend to be approved and declared by our shareholders at a general meeting. The board of directors may direct that the payment be made by distribution of assets, shares or cash and no dividend declared or paid may exceed the amount recommended by the directors. Dividends may be paid in U.S. dollars or any other currency.

Our directors may deduct from any dividend payable to any shareholder any amounts payable by such shareholder to us in relation to our shares.

Our directors may also authorize the issuance of shares with preferred rights to participate in our declared dividends. The holders of preferred shares may, depending on their terms, rank senior to our ordinary shares in terms of dividend rights and/or be entitled to claim arrears of a declared dividend out of subsequently declared dividends in priority to ordinary shareholders.

Share Repurchases, Redemptions and Conversions

Overview

Our Articles of Association provide that, in general, any ordinary share which we have agreed to acquire shall be deemed to be a redeemable share. Accordingly, for Irish company law purposes, the repurchase of ordinary shares by us may technically be effected as a redemption of those shares as described below under “—Repurchases and Redemptions.” If our Articles of Association did not contain such provisions, all repurchases by us would be subject to many of the same rules that apply to purchases of our shares by subsidiaries described below under “—Purchases by Subsidiaries” including the shareholder approval requirements described below. Except where otherwise noted, when we refer to repurchasing or buying back our ordinary shares, we are referring to the redemption of ordinary shares by us pursuant to the Articles of Association or the purchase of our ordinary shares by a subsidiary of the Company, in each case in accordance with our Articles of Association and Irish law as described below. Holders of our ordinary shares have no right to convert the shares into any other security.

Repurchases and Redemptions

Under Irish law, a company may issue redeemable shares and redeem them out of distributable reserves (which are described above under “Dividends”) or, if the company proposes to cancel the shares on redemption, the proceeds of a new issue of shares for that purpose. The redemption of redeemable shares may only be made by us where the nominal value of the issued share capital that is not redeemable is not less than 10% of the nominal value of the total issued share capital of the company. All redeemable shares must also be fully-paid and the terms of redemption of the shares must provide for payment on redemption. Redeemable shares may, upon redemption, be cancelled or held in treasury. Based on the provisions of our articles described above, shareholder approval will not be required to redeem our shares.

We may also be given an additional general authority by our shareholders to purchase our own shares on-market, which would take effect on the same terms and be subject to the same conditions as applicable to purchases by our subsidiaries as described below.

Our board of directors may also issue preferred shares or other classes or series of shares which may be redeemed at either our option or the option of the shareholder, depending on the terms of such preferred shares. Please see “—Capital Structure—Authorized Share Capital.”

Repurchased and redeemed shares may be cancelled or held as treasury shares. The nominal value of treasury shares held by us at any time must not exceed 10% of the nominal value of our issued share capital. We may not exercise any voting rights in respect of any shares held as treasury shares. Treasury shares may be cancelled by us or re-issued subject to certain conditions.

Purchases by Subsidiaries

Under Irish law, an Irish or non-Irish subsidiary of the Company may purchase our shares either as overseas market purchases on a recognized stock exchange such as the Nasdaq or off-market. For a subsidiary of ours to make market purchases of our shares, our shareholders must provide general authorization for such purchase by way of ordinary resolution. However, as long as this general authority has been granted, no specific shareholder authority for a particular market purchase by a subsidiary of our shares is required. We may elect to seek such general authority, which must expire no later than 18 months after the date on which it was granted, at our annual general meetings.

For an off-market purchase by a subsidiary of ours, the proposed purchase contract must be authorized by special resolution of the shareholders before the contract is entered into. The person whose shares are to be bought back cannot vote in favor of the special resolution and from the date of the notice of the meeting at which the resolution approving the contract is proposed, the purchase contract must be on display or must be available for inspection by shareholders at our registered office from the date of the notice of the meeting at which the resolution approving the contract is to be proposed.

In order for a subsidiary of ours to make an on-market purchase of our shares, such shares must be purchased on a “recognized stock exchange.” The Nasdaq Capital Market, on which our ordinary shares are listed, is specified as a recognized stock exchange for this purpose by Irish company law.

The number of shares held by our subsidiaries at any time will count as treasury shares and will be included in any calculation of the permitted treasury share threshold of 10% of the nominal value of our issued share capital. While a subsidiary holds shares of ours, it cannot exercise any voting rights in respect of those shares. The acquisition of our shares by a subsidiary of ours must be funded out of distributable reserves of the subsidiary.

Lien on Shares, Calls on Shares and Forfeiture of Shares

Our Articles of Association provide that we will have a first and paramount lien on every share for all debts and liabilities of any shareholder to the Company, whether presently due or not, payable in respect of such share. Subject to the terms of their allotment, directors may call for any unpaid amounts in respect of any shares to be paid, and if payment is not made within 14 days after notice demanding payment, we may sell the shares. These provisions are standard inclusions in the Articles of Association of an Irish company limited by shares and will only be applicable to our shares that have not been fully paid up. See “—Transfer and Registration of Shares.”

Consolidation and Division; Subdivision

Under our Articles of Association, we may, by ordinary resolution (unless the directors determine otherwise), divide all or any of our issued share capital into shares of smaller nominal value than our existing shares (often referred to as a share split) or consolidate all or any of our issued share capital into shares of larger nominal value than is fixed by our memorandum of association (often referred to as a reverse share split), provided that the proportion between the amount paid for such share and the amount, if any, unpaid on each reduced share after the subdivision remains the same.

Reduction of Share Capital

We may, by ordinary resolution (unless the directors determine otherwise), reduce our authorized but unissued share capital in any way. We also may, by special resolution and subject to confirmation by the Irish High Court, reduce or cancel our issued share capital in any manner permitted by the Irish Companies Act.

Annual General Meetings of Shareholders

We are required to hold an annual general meeting within 18 months of incorporation and at intervals of no more than 15 months thereafter, provided that an annual general meeting is held in each calendar year following the first annual general meeting and no more than nine months after our fiscal year-end. Any annual general meeting may be held outside Ireland, provided that technological means are provided to enable shareholders to participate in the meeting without leaving Ireland.

Notice of an annual general meeting must be given to all of our shareholders and to our auditors. Our Articles of Association provide for a minimum notice period of 21 clear days (i.e. 21 days excluding the day when the notice is given or deemed to be given and the day of the event for which it is given or on which it is to take effect), which is the minimum permitted under Irish law.

The only matters which must, as a matter of Irish company law, be transacted at an annual general meeting are (i) the consideration of the statutory financial statements, report of the directors, and report of the statutory auditors, (ii) review by the members of the company’s affairs and (iii) the appointment or re-appointment of the statutory auditors.

At any annual general meeting, only such business may be conducted as has been brought before the meeting:

• in the notice of the meeting;

• by or at the direction of the board of directors;

• in certain circumstances, at the direction of the Irish High Court;

• as required by law; or

• that the chairman of the meeting determines is properly within the scope of the meeting.

In addition, and subject to compliance with our Articles of Association, shareholders entitled to vote at an annual general meeting may propose business in advance of the meeting to be considered thereat.

Extraordinary General Meetings of Shareholders

Our extraordinary general meetings may be convened by (i) the board of directors, (ii) on requisition of the shareholders holding not less than 10% of our paid up share capital carrying voting rights, (iii) in certain circumstances, on requisition of our auditors; or (iv) in exceptional cases, by order of the Irish High Court.

Extraordinary general meetings are generally held for the purpose of approving shareholder resolutions as may be required from time to time. At any extraordinary general meeting, only such business will be conducted as is set forth in the notice thereof or is proposed pursuant to and in accordance with the procedures and requirements set out in our Articles of Association.

Notice of an extraordinary general meeting must be given to all of our shareholders and to our auditors. Under Irish law and our Articles of Association, the minimum notice periods are 21 clear days’ notice in writing for an extraordinary general meeting to approve a special resolution and 14 clear days’ notice in writing for any other extraordinary general meeting.

In the case of an extraordinary general meeting convened by our shareholders, the proposed purpose of the meeting must be set out in the requisition notice. Upon receipt of any such valid requisition notice, our board of directors has 21 days to convene a meeting of our shareholders to vote on the matters set out in the requisition notice. This meeting must be held within two months of the receipt of the requisition notice. If the board of directors does not convene the meeting within such 21 day period, the requisitioning shareholders, or any of them representing more than one half of the total voting rights of all of them, may themselves convene a meeting, which meeting must be held within three months of our receipt of the requisition notice.

If the board of directors becomes aware that our net assets are not greater than half of the amount of our called-up share capital, our directors must convene an extraordinary general meeting of our shareholders not later than 28 days from the date that the fact is known to a director to be held not later than 56 days from such date. This meeting must be convened for the purposes of considering whether any, and if so what, measures should be taken to address the situation.

Quorum for General Meetings

Our Articles of Association provide that no business shall be transacted at any general meeting unless a quorum is present. One or more shareholders present in person or by proxy at any meeting of shareholders holding not less than a majority of the issued shares that carry the right to vote at the meeting constitutes a quorum for the conduct of any business at a general meeting.

Voting

Our Articles of Association provide that all votes at a general meeting will be decided on a poll and that the board or the chairman may determine the manner in which the poll is to be taken and the manner in which the votes are to be counted.

Every shareholder is entitled to one vote for each ordinary share that he or she holds as of the record date for the meeting. Voting rights may be exercised by shareholders registered in our share register as of the record date for the meeting or by a duly appointed proxy, which proxy need not be a shareholder. Where interests in shares are held by a nominee trust company, this company may exercise the rights of the beneficial holders on their behalf as their proxy. All proxies must be appointed in the manner prescribed by our Articles of Association, which provide that our board of directors may permit shareholders to notify us of their proxy appointments electronically.

In accordance with our Articles of Association, our directors may from time to time authorize the issuance of preferred shares or any other class or series of shares. These shares may have such voting rights as may be specified in the terms of such shares (e.g., they may carry more votes per share than ordinary shares or may entitle their holders to a class vote on such matters as may be satisfied in the terms of such shares). Treasury shares or shares of ours that are held by our subsidiaries will not be entitled to be voted at general meetings of shareholders.

Irish company law requires special resolutions of the shareholders at a general meeting to approve certain matters.

Examples of matters requiring special resolutions include:

• amending the objects as contained in our memorandum of association;

• amending our Articles of Association;

• approving a change of name;

• authorizing the entering into of a guarantee or provision of security in connection with a loan, quasi-loan or credit; transaction to a director or connected person;

• opting out of pre-emption rights on the issuance of new shares;

• re-registration from a public limited company to a private company;

• purchase of own shares off-market;

• reduction of issued share capital;

• sanctioning a compromise/scheme of arrangement;

• resolving that the company be wound up by the Irish courts;

• resolving in favor of a shareholders’ voluntary winding-up;

• re-designation of shares into different share classes;

• setting the re-issue price of treasury shares; and

• variation of class rights attaching to classes of shares (where our Articles of Association do not provide otherwise).

Neither Irish law nor any of our constituent documents places limitations on the right of non-resident or foreign owners to vote or hold our shares.

Variation of Rights Attaching to a Class or Series of Shares

Under our Articles of Association and the Irish Companies Act, any variation of class rights attaching to our issued shares must be approved by an ordinary resolution passed at a general meeting of the shareholders of the affected class or with the consent in writing of the holders of a majority of the issued shares of that class of shares entitled to vote on such variation. The rights conferred upon the holder of any pre-existing issued shares shall not be deemed to be varied by the issuance of any preferred shares.

The provisions of our Articles of Association relating to general meetings apply to general meetings of the holders of any class of shares except that the necessary quorum is determined in reference to the shares of the holders of the class. Accordingly, for general meetings of holders of a particular class of shares, a quorum consists of one or more shareholders present in person or by proxy holding not less than a majority of the issued and outstanding shares of the class entitled to vote at the meeting in question.

Record Date

Our Articles of Association provide that the board may fix in advance a date as the record date (i) for any such determination of members entitled to notice of or to vote at a general meeting of the members, which record date shall not be more than 60 days before the date of such meeting, and (ii) for the purpose of determining the members entitled to receive payment of any dividend or other distribution, or in order to make a determination of members for any other proper purpose, which record date shall not be more than 60 days prior to the date of payment of such dividend or other distribution or the taking of any action to which such determination of members is relevant.

If no record date is fixed for the determination of members entitled to notice of or to vote at a meeting of members, the date immediately preceding the date on which notice of the meeting is deemed given under our Articles of Association will be the record date for such determination of members.

Shareholder Proposals

Under Irish law, there is no general right for a shareholder to put items on the agenda of an annual general meeting of a U.S.-listed company, other than as set out in the Articles of Association of a company. Under our Articles of Association, in addition to any other applicable requirements, for business or nominations to be properly brought before an annual general meeting by a shareholder, such shareholder must have given timely notice thereof in proper written form to our corporate secretary.

To be timely for an annual general meeting, a shareholder’s notice to our secretary as to the business or nominations to be brought before the meeting must be delivered to or mailed and received at our registered office (i) with respect to our first annual general meeting as a public limited company, not later than the 10th day following the day on which public announcement of the date of such annual general meeting is made and (ii) with respect to all other annual general meetings not less than 90 days nor more than 120 days before the first anniversary of the notice convening our annual general meeting for the prior year. In the event that the date of the annual general meeting is changed by more than 30 days from the first anniversary date of the preceding year’s annual general meeting, notice by the member must be so delivered by close of business on the day that is not earlier than 120 days prior to such annual general meeting and not later than the close of business on the later of (a) 90 days prior to the day of the contemplated annual general meeting or (b) 10 days after the day on which public announcement of the date of the contemplated annual general meeting is first made by us. In no event shall the public announcement of an adjournment or postponement of an annual general meeting commence a new time period (or extend any time period) for the giving of a shareholder’s notice.

To be timely for business or nominations of a director at an extraordinary general meeting, notice must be delivered, or mailed and received not less than 90 days nor more than 120 days prior to the date of such extraordinary general meeting or, if the first public announcement of the date of the extraordinary general meeting is less than 100 days

prior to the date of the meeting, by close of business 10 days after the day on which the public announcement of the date of the extraordinary general meeting is first made by us.

For nominations to the board, the notice must include all information about the director nominee that is required to be disclosed by U.S. Securities and Exchange Commission rules regarding the solicitation of proxies for the election of directors pursuant to Regulation 14A under the Exchange Act. For other business that a shareholder proposes to bring before the meeting, the notice must include a brief description of the business, the reasons for proposing the business at the meeting and a discussion of any material interest of the shareholder in the business. Whether the notice relates to a nomination to the board of directors or to other business to be proposed at the meeting, the notice also must include information about the shareholder and the shareholder’s holdings of our shares. The chairman of the meeting shall have the power and duty to determine whether any business proposed to be brought before the meeting was made or proposed in accordance with these procedures (as set out in our Articles of Association), and if any proposed business is not in compliance with these provisions, to declare that such defective proposal shall be disregarded.

Shareholders’ Suits

In Ireland, the decision to institute proceedings on behalf of a company is generally taken by the company’s board of directors. In certain limited circumstances, a shareholder may be entitled to bring a derivative action on our behalf. The central question at issue in deciding whether a minority shareholder may be permitted to bring a derivative action is whether, unless the action is brought, a wrong committed against us would otherwise go unredressed. The cause of action may be against a director, another person or both.

A shareholder may also bring proceedings against us in his or her own name where the shareholder’s rights as such have been infringed or where our affairs are being conducted, or the powers of the board of directors are being exercised, in a manner oppressive to any shareholder or shareholders or in disregard of their interests as shareholders. Oppression connotes conduct that is burdensome, harsh or wrong. This is an Irish statutory remedy under Section 212 of the Irish Companies Act and the court can grant any order it sees fit, including providing for the purchase or transfer of the shares of any shareholder.

Inspection of Books and Records

Under Irish law, shareholders have the right to: (i) receive a copy of our Constitution; (ii) inspect and obtain copies of the minutes of general meetings and any resolutions; (iii) inspect and receive a copy of the register of shareholders, register of directors and secretaries, register of directors’ interests and other statutory registers maintained by us; (iv) inspect copies of directors’ service contracts; (v) inspect copies of instruments creating charges; (vi) receive copies of statutory financial statements and directors’ and auditors’ reports which have previously been sent to shareholders prior to an annual general meeting; and (vii) receive financial statements of a subsidiary company of ours which have previously been sent to shareholders prior to an annual general meeting for the preceding 10 years. Our auditors will also have the right to inspect all of our books, records and vouchers. The auditors’ report must be circulated to the shareholders with our financial statements prepared in accordance with Irish law with the notice of annual general meeting and must be presented to our shareholders at our annual general meeting.

Acquisitions

There are a number of mechanisms for acquiring an Irish public limited company, including:

• a court-approved scheme of arrangement under the Irish Companies Act. A scheme of arrangement with one or more classes of shareholders requires a court order from the Irish High Court and the approval of (i) more than 50% in number of the shareholders of each participating class or series voting on the scheme of arrangement, and (ii) representing 75% in value of the shares of such participating class or series held by the shareholders voting on the scheme of arrangement, in each case at the relevant meeting or meetings. A scheme of arrangement, if authorized by the shareholder of each participating class or series and the court, is binding on all of the shareholders of each participating class or series;

• through a tender or takeover offer by a third party, in accordance with the Irish Takeover Rules and the Irish Companies Act, for all of our shares. Where the holders of 80% or more of our shares (excluding any shares already beneficially owned by the bidder) have accepted an offer for their shares, the remaining shareholders may also be statutorily required to transfer their shares, unless, within one month, the non-tendering shareholders can obtain an Irish court order otherwise providing. If the offeror has acquired acceptances of 80% of all of our shares but does not exercise its “squeeze-out” right, then the non-accepting shareholders also have a statutory right to require the bidder to acquire their shares on the same terms as the original offer, or such other terms as the bidder and the non-tendering shareholders may agree or on such term as an Irish court, on application of the bidder or non-tendering shareholder, may order. If our shares were to be listed on the Euronext Dublin or another regulated stock exchange in the European Union, the aforementioned 80% threshold would be increased to 90%;

• by way of a transaction with a company incorporated in the European Economic Area which includes all member states of the European Union and Norway, Iceland and Liechtenstein (“EEA”) under the European Communities (Cross-Border Mergers) Regulations 2008 (as amended). Such a transaction must be approved by a special resolution and by the Irish High Court. If we are being merged with another EEA company under the EU Cross-Border Mergers Directive (EU) 2019/2121 and the consideration payable to our shareholders is not all in the form of cash, our shareholders may be entitled to require their shares to be acquired at fair value; and

• by way of a merger with another Irish company under the Irish Companies Act which must be approved by a special resolution and by the Irish High Court.

Appraisal Rights

Generally, under Irish law, shareholders of an Irish company do not have statutory appraisal rights. If we are being merged as the transferor company with another EEA company under the European Communities (Cross-Border Merger) Regulations 2008 (as amended) or if we are being merged with another Irish company under the Irish Companies Act, (i) any of our shareholders who voted against the special resolution approving the merger or (ii) if 90% of our shares are held by the successor company, any other of our shareholders, may be entitled to require that the successor company acquire its shares for cash.

Disclosure of Interests in Shares

Under the Irish Companies Act, there is a notification requirement for shareholders who acquire or cease to be interested in 3% of the shares of an Irish public limited company. Our shareholders must therefore make such a notification to us if, as a result of a transaction, the shareholder will become interested in 3% or more of our shares or if, as a result of a transaction, a shareholder who was interested in 3% or more of our shares ceases to be so interested. Where a shareholder is interested in 3% or more of our shares, the shareholder must notify us of any alteration of his or her interest that brings his or her total holding through the nearest whole percentage number, whether an increase or a reduction. The relevant percentage figure is calculated by reference to the aggregate nominal value of the shares in which the shareholder is interested as a proportion of the entire nominal value of our issued share capital (or any such class of share capital in issue). Where the percentage level of the shareholder’s interest does not amount to a whole percentage, this figure may be rounded down to the next whole number. All such disclosures should be notified to us within five business days of the transaction or alteration of the shareholder’s interests that gave rise to the notification requirement. If a shareholder fails to comply with these notification requirements, the shareholder’s rights in respect of any of our shares it holds will not be enforceable, either directly or indirectly. However, such person may apply to the court to have the rights attaching to such shares reinstated.

In addition to these disclosure requirements, under the Irish Companies Act, we may by notice in writing, require a person whom we know or have reasonable cause to believe to be, or at any time during the three years immediately preceding the date on which such notice is issued to have been, interested in shares comprised in our relevant share capital to: (i) indicate whether or not it is the case and (ii) where such person holds or has during that time held an interest in our ordinary shares, to provide additional information, including the person’s own past or present interests

in our shares. If the recipient of the notice fails to respond within the reasonable time period specified in the notice, we may apply to court for an order directing that the affected shares be subject to certain restrictions, as prescribed by the Irish Companies Act, as follows:

• any transfer of those shares, or in the case of unissued shares any transfer of the right to be issued with shares and any issue of shares, will be void;

• no voting rights will be exercisable in respect of those shares;

• no further shares will be issued in right of those shares or in pursuance of any offer made to the holder of those shares; and

• no payment will be made of any sums due from us on those shares, whether in respect of capital or otherwise.

Where our shares are subject to these restrictions, the court may order the shares to be sold and may also direct that the shares shall cease to be subject to these restrictions.

In the event we are in an offer period pursuant to the Irish Takeover Rules, accelerated disclosure provisions apply for persons holding an interest in our securities of 1.0% or more.

Irish Takeover Rules

A transaction in which a third party seeks to acquire 30% or more of our voting rights will be governed by the Irish Takeover Panel Act 1997 and the Irish Takeover Rules made thereunder and will be regulated by the Irish Takeover Panel. The “General Principles” of the Irish Takeover Rules and certain important aspects of the Irish Takeover Rules are described below.

General Principles

The Irish Takeover Rules are built on the following General Principles, which will apply to any transaction regulated by the Irish Takeover Panel:

• in the event of an offer, all holders of securities of the target company should be afforded equivalent treatment and, if a person acquires control of a company, the other holders of securities must be protected;

• the holders of the securities in the target company must have sufficient time and information to enable them to reach a properly informed decision on the offer;

• where it advises the holders of securities, the board of the target company must give its views on the effects of implementation of the offer on employment, conditions of employment and the locations of the target company’s places of business;

• the board of the target company must act in the interests of the company as a whole and must not deny the holders of securities the opportunity to decide on the merits of the offer;

• false markets must not be created in the securities of the target company, the bidder or of any other company concerned by the offer in such a way that the rise or fall of the prices of the securities becomes artificial and the normal functioning of the markets is distorted;

• a bidder must announce an offer only after ensuring that he or she can fulfil in full, any cash consideration, if such is offered, and after taking all reasonable measures to secure the implementation of any other type of consideration;

• a target company must not be hindered in the conduct of its affairs for longer than is reasonable by an offer for its securities; and

• a substantial acquisition of securities (whether such acquisition is to be effected by one transaction or a series of transactions) shall take place only at an acceptable speed and shall be subject to adequate and timely disclosure.

Mandatory Bid

Under certain circumstances, a person who acquires shares or other of our voting rights may be required under the Irish Takeover Rules to make a mandatory cash offer for our remaining outstanding shares at a price not less than the highest price paid for the shares by the acquirer (or any parties acting in concert with the acquirer) during the previous 12 months. This mandatory bid requirement is triggered if an acquisition of shares would (i) increase the aggregate holding of an acquirer (including the holdings of any parties acting in concert with the acquirer) to shares representing 30% or more of our voting rights, or (ii) in the case of a person holding (together with its concert parties) shares representing 30% or more of our voting rights, after giving effect to the acquisition, increase the percentage of the voting rights held by that person (together with its concert parties) by 0.05% within a 12-month period. Any person (excluding any parties acting in concert with the holder) holding shares representing more than 50% of the voting rights of a company is not subject to these mandatory offer requirements in purchasing additional securities.

Voluntary Bid; Requirements to Make a Cash Offer and Minimum Price Requirements

A voluntary offer is an offer that is not a mandatory offer. If a person makes a voluntary offer to acquire outstanding ordinary shares of ours, the offer price must be no less than the highest price paid for our shares by the bidder or its concert parties during the three-month period prior to the commencement of the offer period. The Irish Takeover Panel has the power to extend the “look back” period to 12 months if the Irish Takeover Panel, taking into account the General Principles, believes it is appropriate to do so.

If the bidder or any party acting in concert with it has acquired our ordinary shares (i) during the period of 12 months prior to the commencement of the offer period which represent more than 10% of our total ordinary shares or (ii) at any time after the commencement of the offer period, the offer must be in cash (or accompanied by a full cash alternative) and the price per ordinary share must not be less than the highest price paid by the bidder or any party acting in concert with it during, in the case of (i), the 12-month period prior to the commencement of the offer period and, in the case of (ii), the offer period. The Irish Takeover Panel may apply this rule to a bidder who, together with any party acting in concert with it, has acquired less than 10% of our total ordinary shares in the 12-month period prior to the commencement of the offer period if the Irish Takeover Panel, taking into account the General Principles, considers it just and proper to do so.

An offer period will generally commence from the date of the first announcement of the offer or proposed offer.

Substantial Acquisition Rules

The Irish Takeover Rules also contain rules governing substantial acquisitions of shares which restrict the speed at which a person may increase his or her holding of shares and rights over shares to an aggregate of between 15% and 30% of our voting rights. Except in certain circumstances, an acquisition or series of acquisitions of shares or rights over shares representing 10% or more of our voting rights is prohibited if such acquisition(s), when aggregated with shares or rights already held, would result in the acquirer holding 15% or more but less than 30% of our voting rights and such acquisitions are made within a period of seven days. These rules also require accelerated disclosure of acquisitions of shares or rights over shares relating to such holdings.

Anti-Takeover Provisions

Shareholder Rights Plan

Our Articles of Association expressly authorize our board of directors to adopt a shareholder rights plan, subject to applicable law.

Frustrating Action

Under the Irish Takeover Rules, our board of directors is not permitted to take any action which might frustrate an offer for our shares once our board of directors has received an approach which may lead to an offer or has reason to believe an offer is imminent, subject to certain exceptions. Potentially frustrating actions such as (i) the issue of shares, options or convertible securities, (ii) material acquisitions or disposals, (iii) entering into contracts other than in the ordinary course of business or (iv) any action, other than seeking alternative offers, which may result in frustration of an offer, are prohibited during the course of an offer or at any time during which the board of directors has reason to believe an offer is imminent. Exceptions to this prohibition are available where:

• the action is approved by our shareholders at a general meeting; or

• the Irish Takeover Panel has given its consent, where:

o it is satisfied the action would not constitute frustrating action;

o our shareholders that hold 50% of the voting rights state in writing that they approve the proposed action and would vote in favor of it at a general meeting;

o the action is taken in accordance with a contract entered into prior to the announcement of the offer; or

o the decision to take such action was made before the announcement of the offer and either has been at least partially implemented or is in the ordinary course of business.

Business Combinations with Interested Shareholders

Our Articles of Association provide that, subject to certain exceptions, we may not engage in certain business combinations with any person that acquires beneficial ownership of 15% or more of our outstanding voting shares for a period of three years following the date on which the person became a 15% shareholder unless: (i) prior to the date on which the person becomes a 15% shareholder, a committee of our disinterested directors approved the business combination; and (ii) in certain circumstances, the business combination is authorized by a special resolution of disinterested shareholders.

Further Provisions

Certain other provisions of Irish law or our Constitution may be considered to have anti-takeover effects, including advance notice requirements for director nominations and other shareholder proposals, as well as those described under the headings “—Capital Structure—Authorized Share Capital” (regarding issuance of preferred shares), “—Pre-emption Rights, Share Warrants and Share Options,” “—Disclosure of Interests in Shares,” “—Appointment of Directors,” and “—Removal of Directors.”

Insider Dealing

The Irish Takeover Rules also provide that no person, other than the bidder, who is privy to confidential price-sensitive information concerning an offer made in respect of the acquisition of a company (or a class of its securities) or a contemplated offer shall deal in relevant securities of the target during the period from the time at which such person first has reason to suppose that such an offer, or an approach with a view to such an offer being made, is contemplated to the time of (i) the announcement of such offer or approach or (ii) the termination of discussions relating to such offer, whichever is earlier.

Corporate Governance

Our Articles of Association allocate authority over the day-to-day management of the Company to the board of directors. Our board of directors may then delegate management of the Company to committees of the board or such other persons as it thinks fit. Regardless of any delegation, the board of directors will remain responsible, as a matter of Irish law, for the proper management of the affairs of our Company. The board of directors may create new committees or change the responsibilities of existing committees from time to time. Committees may meet and adjourn as they determine proper. Unless otherwise determined by the board of directors, the quorum necessary for the transaction of business at any committee meeting shall be a majority of the members of the committee.

Appointment of Directors

The Irish Companies Act provides for a minimum of two directors. Our Articles of Association provide that the number of directors will be not less than two and not more than 13. The authorized number of directors within the prescribed range will be determined solely by our board of directors and does not require approval or ratification by the shareholders in a general meeting. Our directors will be elected by way of an ordinary resolution at a general meeting save that directors in contested elections will be elected by a plurality of the votes of the shares present in person or represented by proxy at the relevant general meeting and entitled to vote on the election of directors. If the number of the directors is reduced below the fixed minimum number, the remaining director or directors may appoint an additional director or additional directors to make up such minimum or may convene a general meeting for the purpose of making such appointment. Casual vacancies may be filled by the board of directors.

Our Articles of Association provide that our board of directors is divided into three classes serving staggered three-year terms. Shareholders do not have cumulative voting rights. Accordingly, the holder of a majority of the voting rights attaching to our ordinary shares will, as a practical matter, be entitled to control the election of all directors. At each annual general meeting, directors will be elected for a full term of three years to succeed those directors of the relevant class whose terms are expiring.

Under our Articles of Association, our board of directors has the authority to appoint directors to the board either to fill a vacancy or as an additional director. A vacancy on the board of directors created by the removal of a director may be filled by an ordinary resolution of the shareholders at the meeting at which such director is removed and, in the absence of such election or appointment, the remaining directors may fill the vacancy. The board of directors may fill a vacancy by an affirmative vote of a majority of the directors constituting a quorum. If there is an insufficient number of directors to constitute a quorum, the board may nonetheless act to fill such vacancies or call a general meeting of the shareholders. Under our Articles of Association, if the board fills a vacancy, the director will hold this position as a director for a term that will coincide with the remaining term of the relevant class of director. If there is an appointment to fill a casual vacancy or an addition to the board, the total number of directors shall not at any time exceed the number of directors from time to time fixed by the board in accordance with our Articles of Association.

Removal of Directors

The Irish Companies Act provides that, notwithstanding anything contained in the Articles of Association of a company or in any agreement between that company and a director, the shareholders may, by an ordinary resolution, remove a director from office before the expiration of his or her term, provided that notice of the intention to move any such resolution be given by the shareholders to the company not less than 28 days before the meeting at which the director is to be removed, and the director will be entitled to be heard at such meeting. The power of removal is without prejudice to any claim for damages for breach of contract (e.g., employment agreement) that the director may have against us in respect of his or her removal.

Director Interested Transactions

Under the Irish Companies Act and our Articles of Association, a director who has an interest in a proposal, arrangement or contract is required to declare the nature of his or her interest at the first opportunity either (i) at a meeting of the board at which such proposal, arrangement or contract is first considered (provided such director knows this interest then exists, or in any other case, at the first meeting of the board after learning that he or she is or has

become so interested) or (ii) by providing a general notice to the directors declaring that he or she is to be regarded as interested in any proposal, arrangement or contract with a particular person, and after giving such general notice will not be required to give special notice relating to any particular transaction. Provided the interested director makes such required disclosure, he or she shall be counted in determining the presence of a quorum at a meeting regarding the relevant proposal, arrangement or contract and will be permitted to vote on such proposal, arrangement or contract.

Pursuant to our Articles of Association, it is within the directors’ sole discretion to determine their compensation.

Borrowing

Pursuant to our Articles of Association, among the directors’ powers are the right to borrow money and to mortgage or charge the Company’s undertaking, property and uncalled capital or any part thereof and to issue debentures, debenture stock, mortgages, bonds or such other securities whether outright or as security for any debt, liability or obligation of the Company or of any third party.

Duration; Dissolution; Rights upon Liquidation

Our duration will be unlimited. We may be dissolved and wound up at any time by way of a shareholders’ voluntary winding up or a creditors’ winding up. In the case of a shareholders’ voluntary winding-up, a special resolution of shareholders is required. We may also be dissolved by way of court order on the application of a creditor, or by the Companies Registration Office as an enforcement measure where we have failed to file certain returns. We may also be dissolved by the Director of Corporate Enforcement in Ireland where the affairs of the Company have been investigated by an inspector and it appears from the report or any information obtained by the Director of Corporate Enforcement that we should be wound up.

The rights of the shareholders to a return of our assets on dissolution or winding up, following the settlement of all claims of creditors, are prescribed in our Articles of Association or the terms of any shares issued by the directors from time to time. The holders of preferred shares in particular may have the right to priority in a dissolution or winding up. If the Articles of Association and terms of issue of the shares of the Company contain no specific provisions in respect of a dissolution or winding up then, subject to the shareholder priorities and the rights of any creditors, the assets will be distributed to shareholders in proportion to the paid-up nominal value of the shares held. Our Articles of Association provide that our ordinary shareholders may be entitled to participate in a winding up, and the method by which the property will be divided shall be determined by the liquidator, subject to a special resolution of the shareholders, but such rights of ordinary shareholders to participate may be subject to the rights of any preferred shareholders to participate under the terms of any series or class of preferred shares.

Share Certificates

Pursuant to the Irish Companies Act, a shareholder is entitled to be issued a share certificate on request and subject to payment of a nominal fee.

Stock Exchange Listing

Our ordinary shares are listed on the Nasdaq Capital Market under the symbol “ITRM.” Our ordinary shares are not listed on the Euronext Dublin.

No Sinking Fund

Our shares have no sinking fund provisions.

Transfer and Registration of Shares

Our transfer agent is Computershare Trust Company, N.A. The transfer agent maintains our share register, and registration in the share register will be determinative of membership in us. A shareholder of ours who only holds shares beneficially will not be the holder of record of such shares. Instead, the depository or other nominee will be the holder of record of those shares. Accordingly, a transfer of shares from a person who holds such shares beneficially to a person who also holds such shares beneficially through a depository or other nominee will not be registered in our official share register, as the depository or other nominee will remain the record holder of any such shares.

A written instrument of transfer is required under Irish law in order to register on our official share register any transfer of shares (i) from a person who holds such shares directly to any other person, (ii) from a person who holds such shares beneficially to a person who holds such shares directly or (iii) from a person who holds such shares beneficially to another person who holds such shares beneficially where the transfer involves a change in the depository or other nominee that is the record owner of the transferred shares. An instrument of transfer is also required for a shareholder who directly holds shares to transfer those shares into his or her own broker account (or vice versa). Such instruments of transfer may give rise to Irish stamp duty, which must be paid prior to registration of the transfer on our official Irish share register. However, a shareholder who directly holds shares may transfer those shares into his or her own broker account (or vice versa) without giving rise to Irish stamp duty provided there is no change in the ultimate beneficial ownership of the shares as a result of the transfer and the transfer is not made in contemplation of a sale of the shares.

Any transfer of our shares that is subject to Irish stamp duty will not be registered in the name of the buyer unless an instrument of transfer is duly stamped and provided to our transfer agent. Our Articles of Association allow us, in our absolute discretion, to create an instrument of transfer and pay (or procure the payment of) any stamp duty, which is the legal obligation of a transferee. In the event of any such payment, we are (on behalf of ourselves or our affiliates) entitled to (i) seek reimbursement from the transferee or transferor (at its discretion), (ii) set-off the amount of the stamp duty against future dividends payable to the transferee or transferor (at its discretion) and (iii) have a lien against the shares on which it has paid stamp duty. Parties to a share transfer may assume that any stamp duty arising in respect of a transaction in our shares has been paid unless one or both of such parties is otherwise notified by us.

Our Articles of Association delegate to our secretary (or such other person as may be nominated by the secretary for this purpose) the authority to execute an instrument of transfer on behalf of a transferring party.

Our Articles of Association grant our board of directors general discretion to decline to register an instrument of transfer unless the transfer is in respect of one class of shares only, the instrument of transfer is accompanied by the certificate of shares to which it relates (if any) and such other evidence as the directors may reasonably require to show the right of the transferor to make the transfer, the instrument of transfer is in favor of not more than four transferees and it is lodged at our registered office or such other place as our directors or secretary may appoint.

The directors may suspend registration of transfers from time to time, not exceeding 30 days in aggregate each year, as our board of directors may from time to time determine (except as may be required by law).

EX-10

Exhibit 10.18

Dated December 31, 2022

ITERUM THERAPEUTICS INTERNATIONAL LIMITED

-and-

MICHAEL DUNNE

AMENDMENT TO CONTRACT FOR SERVICES

THIS AMENDMENT to a CONTRACT FOR SERVICES is made and entered into on December 31, 2022 by and between:

(1) Iterum Therapeutics International Limited whose registered office is at Fitzwilliam Court, 1st Floor, Leeson Close, Dublin 2, D02 YW24, Ireland (the Company); and

(2) Michael Dunne of 30 Cromwell Place, Old Saybrook, CT, 06475 (the Contractor),

hereinafter referred to as Amendment No.1.

The Company and the Contractor are hereinafter individually referred to as a Party or collectively referred to as the Parties.

RECITALS

A.The Parties entered into a Contract for Services dated May 25, 2022, pursuant to which the Contractor agreed to provide the Services to the Company and any Associated Company upon and subject to the terms and conditions therein contained (the Consultancy Agreement), a copy of which is attached hereto in Schedule 1.

B.The Parties hereto wish to amend the Consultancy Agreement as prescribed herein, effective as of December 31, 2022 (the Amendment Effective Date).

IT IS HEREBY AGREED as follows:

1.EXISTING TERMS, CONDITIONS AND DEFINITIONS

1.1.Unless specifically amended herein, the terms and conditions described in the Consultancy Agreement shall remain in full force and effect.

1.2.Capitalised terms (including those used in the Recitals above) shall be as defined in the Consultancy Agreement.

2.TERM

2.1.Clause 3.1 (“Term”) of the Consultancy Agreement shall be amended to read as follows:

“This Agreement commenced on the Commencement Date and continues until 30 June 2023 unless earlier terminated in accordance with clause 3.2 or clause 14. The Term may be extended by mutual agreement of the parties.”

3.AMENDMENT

3.1.All references to “Agreement”, “hereunder”, “herein”, “hereof” or similar words referring to the Consultancy Agreement, from and after the Amendment Effective Date, shall mean and refer to the Consultancy Agreement as amended by this Amendment No.1.

4.COUNTERPARTS

4.1.This Amendment No.1 may be executed in any number of counterparts, and by the Parties on separate counterparts, each of which when so executed will constitute an original but all of which together will evidence the same agreement.

IN WITNESS whereof this Amendment No.1 has been entered into on the date first herein written.

SIGNED on behalf of the Company:

/s/ Corey Fishman

…...........................................

Signature

Name: Corey Fishman

Title: Director and CEO

SIGNED By Contractor:

/s/ Michael Dunne

…...........................................

Signature

Name: Michael

SCHEDULE 1

THE CONSULTANCY AGREEMENT

Dated May 25, 2022

ITERUM THERAPEUTICS INTERNATIONAL LIMITED

-and-

MICHAEL DUNNE

CONTRACT FOR SERVICES

THIS AGREEMENT is dated May 25, 2022 and made between:

(1) Iterum Therapeutics International Limited whose registered office is at Fitzwilliam Court, 1st Floor, Leeson Close, Dublin 2, DO2 YW24, Ireland (the Company); and

(2) Michael Dunne of 30 Cromwell Place, Old Saybrook, CT, 06475 (the Contractor)

Hereinafter referred to as the Agreement.

RECITAL

The Contractor has agreed to provide the Services to the Company and any Associated Company upon and subject to the terms and conditions hereinafter contained.

IT IS HEREBY AGREED as follows:

5.DEFINITIONS AND INTERPRETATION

5.1.In this Agreement, unless the context otherwise requires:

Associated Company means any holding company or any subsidiary of the Company (as such terms are defined by section 7 and section 8 of the Companies Act, 2014) or any subsidiary of such holding company;

Board means the Board of Directors of Iterum Therapeutics plc;

Business of the Company means development and commercialization of therapies focused on patients with infectious diseases and other acute illnesses. Our lead product candidate, sulopenem, is in development for the treatment of patients with uncomplicated urinary tract infections (uUTI) associated primarily with resistant gram-negative bacteria;

Business Day means any day on which banks are generally open for business in Dublin;

Business Opportunities means any opportunities which the Contractor becomes aware of during the course of the Agreement which relates to the Business of the Company;

Capacity means as agent, contractor, director, employee, owner, partner, and shareholder or in any other capacity;

Commencement Date means May 1, 2022;

Companies mean the Company and any Associated Company or any of them;

Company Property means all documents, books, records, correspondence, papers and information (on whatever media and wherever located) relating to the Business of the Company or its customers and business contacts including any equipment, keys, hardware or software provided to the Contractor during the term of the Agreement and any data or documents (including copies) produced, maintained or stored by the Contractor for the Company on the Contractor's computer systems or other electronic equipment during the Agreement;

Confidential Information means any and all information received or obtained as a result of entering into or performing, or supplied by or on behalf of a party in the negotiations leading to, this Agreement and which relates to:-

(a) the Companies;

(b) any aspect of any Business of the Companies;

(c) the provisions of this Agreement;

(d) the negotiations relating to this Agreement; or

(e) the subject matter of this Agreement.

FDA means the United States Food and Drug Administration;

Fees mean the remuneration payable by the Company to the Contractor for the provision of the Services in accordance with clause 4 and Schedule 1;

Force Majeure means, in relation to either party, any circumstances beyond the reasonable control of that party (including, without limitation, any strike, lock-out or other form of industrial action);

Intellectual Property Rights means patents, rights to invention, copyright and related rights, trademarks, trade names and domain names, rights in get-up, rights in goodwill or to sue for passing off, unfair competition rights, rights in designs, rights in computer software, database rights, topography rights, rights in confidential information (including know-how and trade secrets) and any other intellectual property rights, in each case whether registered or unregistered and including all applications (or rights to apply) for, and renewals or extensions of, such rights and all similar or equivalent rights or forms of protection which subsist or will subsist now or in the future in any part of the world;

Inventions means any invention, idea, discovery, development, improvement or innovation made by the Contractor in connection with the provision of the Services, whether or not patentable or capable of registration, and whether or not recorded in any medium;

Month means calendar month; and

NDA means a new drug application (or any successor form or application having substantially the same effect with respect to the approval of a drug for marketing and sale);

Term shall have the meaning given to that term in clause 3, as may be extended for time to time.

Services means the Services specified in Schedule 2 to this Agreement.

Works means all records, reports, documents, papers, drawings, designs, transparencies, photos, graphics, logos, software programmes, inventions, ideas, discoveries, developments, improvements or innovations and all materials embodying them in whatever form prepared by the Contractor or Individual in connection with the provision of the Service.

5.2.The Schedules referred to in this Agreement form an integral part of this Agreement, and references to this Agreement include reference to the Schedules.

5.3.All references in this Agreement to costs, charges or expenses include any value added tax or similar tax charged or chargeable on them.

5.4.Unless the context otherwise requires, in this Agreement:

5.4.1.words denoting the singular include the plural and vice versa and words importing the masculine include the feminine;

5.4.2.references to Acts, statutory instruments and other legislation are to legislation operative in Ireland and to such legislation, modified, consolidated, amended or re-enacted (whether before or after the date of this Agreement) and any subordinate legislation made under that legislation;

5.4.3.reference to any Irish legal term, concept, legislation or regulation (including, without limitation, those for any action, remedy, method of judicial proceeding, document, statute, court official, governmental authority or agency) or any accounting term or concept, in respect of any jurisdiction other than Ireland is construed as a reference to the term or concept which most nearly corresponds to it in that jurisdiction; and

5.4.4.reference to any document includes that document as amended or supplemented whether before or after the date of this Agreement.

6.APPOINTMENT OF CONTRACTOR

6.1.The Company hereby appoints the Contractor to provide the Services to the Companies during the term of this Agreement, and the Contractor shall act in that capacity subject to the terms and conditions of this Agreement.

7.TERM

7.1.This Agreement commenced on the Commencement Date and continues until 31 December 2022 unless earlier terminated in accordance with clause 3.2 or clause 14. The Term may be extended by mutual agreement of the parties.

7.2.Subject to clause 14, either party may terminate this Agreement on not less than two months’ notice in writing to the other party and the termination date shall be the expiry of the notice period.

8.FEES

8.1.The Company shall pay to the Contractor the Fees set out in Schedule 1 within 7 days of receipt of the Contractor’s invoice therefor to such bank account as the Contractor may from time to time notify in writing to the Company. Invoices shall be furnished by the Contractor monthly in arrears on the last day of each month and will be payable by the Company 7 days from the date of the invoice.

9.DUTIES AND OBLIGATIONS OF CONTRACTOR

9.1.The Contractor shall provide the Services on such days as are required and agreed in writing by the Company from time to time and in consideration of the Contractor working such days will be remunerated in accordance with Clause 4.1 above.

9.2.The Contractor shall:

5.2.1. provide the Services with all due care, skill and ability and use his best endeavours to promote the interests of the Company;

5.2.2. promptly give to the Company all such information and reports as it may reasonably require in connection with matters relating to the provision of the Services or the Business of the Company

9.3.If the Contractor is unable to provide the Services due to illness or injury, the Contractor shall advise the Company of that fact as soon as reasonably practicable. For the avoidance of doubt, no fee shall be payable in accordance with clause 4 in respect of any period during which the Services are not provided.

9.4.Unless specifically authorised to do so by the Company:

9.4.1.The Contractor shall not have any authority to incur any expenditure in the name of or for the account of the Company; and

9.4.2.The Contractor shall not hold himself out as having authority to bind the Company

9.5.The Contractor undertakes to comply with all reasonable standards of safety and comply with the health and safety procedures of the Company from time to time in force at the premises where the Services are provided and report to the Company any unsafe working conditions or practices.

9.6.The Contractor undertakes during the appointment to take all reasonable steps to offer (or cause to be offered) to the Company any Business Opportunities as soon as practicable after the same shall have come to its or his knowledge and in any event before the same shall have been offered by the Contractor (or caused to be offered) to any other party.

9.7.The Contractor may use a third party to perform any administrative, clerical or secretarial functions which are reasonably incidental to the provision of the Services provided that the Company will not be liable to bear the cost of such functions.

9.8.The Contractor shall:

9.8.1.comply with all applicable laws, regulations, codes and sanctions relating to anti-bribery and anti-corruption in Ireland or in any other jurisdiction in relation to which work is undertaken;

9.8.2.comply with any Ethics and Anti-bribery and Anti-corruption Policies of the Company and any relevant industry code in force from time to time (Relevant Policies);

9.8.3.promptly report to the Company any request or demand for any undue financial or other advantage of any kind received by the Contractor in connection with the performance of this Agreement; and

9.8.4.ensure that all persons associated with the Contractor who are performing services in connection with this Agreement comply with this clause 5.8.

9.9.Breach of clause 5.8 shall be deemed a material breach of this Agreement.

9.10.The Contractor shall be responsible for all property of the Companies in his possession.

9.11.The Contractor shall obtain all necessary licences, certificates, permits, consents and authorisations from all relevant government departments, agencies or regulatory authorities to enable it to perform and carry out is obligations under or pursuant to this Agreement.

9.12.The Contractor shall comply with all relevant environmental and safety legislation and shall comply with all legal requirements from time to time in force relating to the Services.

9.13.The Contractor shall from time to time consult with representatives of the Companies for the purpose of assessing the quality of the Services and obtaining feedback.

9.14.The Contractor will provide the Company with copies of all necessary documentation, including all and any delivery dockets, route sheets, cash receipts, settlement sheets, cash summaries and other documentation required by the Company for the orderly completion of the Contractor’s duties relating to the Services provided by the Contractor under this Agreement.

10.EXPENSES

10.1.The Company shall reimburse all reasonable expenses properly and necessarily incurred by the Contractor in the course of the appointment, subject to the Contractor seeking prior consent from the Company to incur such expenditure and the production of receipts or other appropriate evidence of payment.

10.2.If the Contractor is required to travel abroad in the course of the appointment the Contractor shall be responsible for any necessary insurances, inoculations and immigration requirements. For the avoidance of doubt, the Company shall discharge the flight and accommodation costs excluding subsistence costs associated with the Contractor's requirement to travel under this agreement.

11.OTHER ACTIVITIES

11.1.Nothing in this Agreement shall prevent the Contractor from being engaged, concerned or having any financial interest in any Capacity in any other business, trade, profession or occupation during the appointment provided that:

11.1.1.such activity does not cause a breach of any of the Contractor's obligations under this Agreement; and

11.1.2.the Contractor shall not engage in any such activity if it relates to a business which is similar to or in any way competitive with the Business of the Company or Companies, without the prior written consent of the Company and the Contractor agrees to give priority to the provision of the Services to the Company over any other business activities undertaken by it during the course of the appointment.

12.CONFIDENTIAL INFORMATION & COMPANY PROPERTY

12.1.The parties agree that the terms of this Agreement are confidential to the parties and their professional advisors.

12.2.The Contractor acknowledges that prior to, and in the course of, the appointment he will have access to Confidential Information. The Contractor has therefore agreed to accept the restrictions in this clause 8 which will continue to apply after the termination or expiry of the Agreement.

12.3.The Contractor shall not (except in the proper course of his duties), between signing this Agreement and the date of its commencement, during the appointment or at any time after the termination date, use or disclose to any third party (and shall use his reasonable endeavours to prevent the publication or disclosure of) any Confidential Information. This restriction does not apply to:

12.3.1.any use or disclosure authorised by the Company or required by law; or

12.3.2.any information which is already in, or comes into, the public domain otherwise than through the unauthorised disclosure of the Contractor;

12.4.At any stage during the appointment, the Contractor will promptly on request return all and any Company Property in his possession.

13.INTELLECTUAL PROPERTY

13.1.The Contractor shall give the Company full written details of all Inventions and of all works embodying Intellectual Property Right made wholly or partially by the Contractor, or any appointed substitute (as the case may be) at any time during the course of this Agreement which relate to, or are reasonably capable of being used in the Business of the Company.

13.2.The Contractor acknowledges that all Intellectual Property Rights subsisting in any work or Invention made, originated or developed by the Contractor or any appointed substitute (as the case may be) at any time in relation to the Services shall automatically on creation, vest in and be the absolute sole and unencumbered property of the Company. To the extent that the Intellectual Property Rights do not vest automatically with the Company the Contractor holds them on trust

for the Company. The Contractor hereby agrees to execute or to procure the execution of all such documents to make such applications and give such assistance as may in the opinion of the Company be necessary to give effect to this clause.

13.3.The Contractor hereby irrevocably waives all moral rights under the Copyright and Related Rights Act 2000 to 2007 (and all similar rights in other jurisdictions) which the Contractor has or will have in any existing or future works referred to in this clause.

13.4.The Contractor irrevocably appoints the Company or its nominee to be its attorney to execute in its name and on its behalf any document or instrument for the purpose of giving the Company or its nominee the benefit of this clause. The Contractor acknowledges in favour of any third party that a certificate in writing signed by the Company that any instrument or act falls within the authority conferred by this clause shall be conclusive evidence that such is the case.

13.5.The Contractor acknowledges that no further remuneration or compensation other than that provided for in this Agreement is or may become due to the Contractor in respect of the performance of its obligations under this clause 9.

14.DATA PROTECTION

14.1.All personal information which the Company holds about the Contractor is protected by data protection laws. The Company will collect and process personal data relating to employees in accordance with the privacy notice which is attached at Schedule 3.

15.WARRANTIES AND REPRESENTATIONS

15.1.The Contractor warrants and represents that it has full capacity and authority to enter into and perform this Agreement.

15.2.The Contractor warrants and represents that the Contractor will carry out the Services in a good and workmanlike manner and:

15.2.1.that the Contractor has the necessary skill to render the Services;

15.2.2.that the Contractor will supply the Services with due skill, care and diligence;

15.2.3.that, where materials are used, they will be sound and reasonably fit for the purpose for which they are required; and

15.2.4.that, where goods are supplied under this Agreement, they will be of merchantable quality within the meaning of section 4(3) of the Sale of Goods Act 1893.

15.3.The Contractor warrants and represents that, in connection with the provision of the Services under this Agreement, it will at all times:

15.3.1.maintain all necessary licences, certificates, permits, consents and authorisations from all relevant government departments, agencies or regulatory authorities;

15.3.2.comply in all material respects with all relevant environmental and safety legislation; and

15.3.3.comply with all legal requirements from time to time in force relating to the Services and the provision of them.

15.4.The Contractor warrants and represents that it will at all times conduct its business in a manner that shall reflect favourably on the Companies, the Services and the good name and reputation of the Companies.

16.INDEMNITY

16.1.The Contractor shall indemnify and keep indemnified the Companies their respective officers, directors and employees from and against any and all loss, damage or liability (whether criminal or civil) suffered and legal fees and costs incurred, resulting from:

16.1.1. any breach of this Agreement by the Contractor, its employees or agents; and

16.1.2.any act, neglect or default of the Contractor, its employees or agents.

17.LIMITATION OF LIABILITY

17.1.Notwithstanding anything to the contrary in this Agreement, the Company will not (except in respect of death or personal injury caused by any negligent act or omission of the Company) be liable to the Contractor by reason of any representation or implied warranty, condition or other term or any duty at common law, or under the express terms of this Agreement for any consequential loss or damage (whether occasioned by the negligence of the Company, its employees or agents) or otherwise arising out of or in connection with this Agreement.

18.TERMINATION

18.1.Either party may terminate this Agreement in accordance with clause 3.

18.2.The Company will be entitled to terminate this Agreement by giving not less than 7 days’ written notice to the Contractor if the Contractor at any time challenges the validity of any intellectual property rights of the Companies.

18.3.The Company will be entitled forthwith to terminate this Agreement by written notice to the Contractor if:

18.3.1.the Contractor commits any breach of any of the provisions of this Agreement and, in the case of a breach capable of remedy, fails to remedy the same within 30 days after receipt of a written notice giving full particulars of the breach and requiring it to be remedied;

18.3.2.an encumbrancer takes possession of or a receiver is appointed over any of the property or assets of the Contractor;

18.3.3.the Contractor makes any voluntary arrangement with its creditors or becomes subject to an administration order;

18.3.4.the Contractor is declared bankrupt;

18.3.5.anything analogous to any of the foregoing under the law of any jurisdiction occurs in relation to the Contractor;

18.3.6.the Contractor is incapacitated from carrying on the Service for an aggregate period of 150 days in any 52-week period;

18.3.7.the Contractor is convicted of any criminal offence (other than an offence under the road traffic legislation) in Ireland or elsewhere for which a non-custodial penalty is imposed;

18.3.8.the Contractor is, in the reasonable opinion of the Board of the Company, negligent or incompetent in the performance of the Services; or

18.3.9.the Contractor, ceases or threatens to cease, to carry on business.

18.4.For the purposes of clause 14.3.1, a breach will be considered capable of remedy if the party in

breach can comply with the provision in question in all respects other than as to the time of performance (provided that time of performance is not of the essence).

18.5.Subject as otherwise provided herein and to any rights or obligations which have accrued prior to termination, neither party will have any further obligation to the other under this Agreement.

19.CONSEQUENCES OF TERMINATION

19.1.Upon the termination or expiry of this Agreement for any reason:

19.1.1.the Contractor shall cease to provide the Services;

19.1.2.the Contractor shall immediately return to the Company all the Companies’ property held by the Contractor or under his control;

19.1.3.the provisions of clauses 8, 9, 17 and this clause 15 will continue in force in accordance with their respective terms;

19.1.4.the Contractor shall cease to refer to himself as being in any way affiliated or associated with the Company;

19.1.5.the Contractor will have no claim against the Company for loss or profits, loss of goodwill or any other loss;

19.1.6.insofar as is reasonably possible the Contractor shall irretrievably delete any information relating to the Business of the Company or any Companies stored on any magnetic or optical disk or memory and all matter derived from such sources which is in his possession or under his control outside the premises of the Company. For the avoidance of doubt, the contact details of business contacts made during the appointment are regarded as Confidential Information, and as such, must be deleted from personal, social or professional networking accounts; and

19.1.7.provide a signed statement that it/he has complied fully with his obligations under this clause 15.

20.STATUS

20.1.The relationship of the Contractor to the Company will be that of independent contractor and nothing in this agreement shall render the Contractor an employee, worker, agent or partner of the Company. The Contractor shall have the right to control and determine the time, place, methods, manner and means of performing the Services. In performing the Services, the amount of time devoted by the Contractor on any given day will be entirely within the Contractor’s control, and the Company will rely on the Contractor to put in the amount of time necessary to fulfill the requirements of this Agreement.

20.2.This Agreement constitutes a contract for the provision of services and is not a contract of employment and accordingly the Contractor shall be fully responsible for any income tax, PRSI and USC contributions and any other liability, deduction, contribution, assessment or claim arising from or made in connection with either the performance of the Services whether in Ireland or elsewhere. Further, the Contractor shall not be entitled to any benefits, coverages or privileges, including, without limitation, health insurance, social security, unemployment, medical or pension payments, made available to employees of the Company.

21.MISCELLANEOUS PROVISIONS

21.1.Announcements:

21.1.1.Subject to clause 17.1.2, neither party shall make any announcement to shareholders, employees, customers or suppliers, or to securities markets or other authorities or to the media or otherwise, regarding the subject-matter of this Agreement or any term or provision of it without the prior written approval of the other party to this Agreement.

21.1.2.Clause 17.1.1 will not apply if and to the extent that such announcement is required by any law or by:

(1)contractual arrangements in existence at the date of this Agreement; or

(2)any securities exchange, regulatory or governmental authority or Court having jurisdiction over the party making the announcement,

whether or not the requirement has the force of law provided that any such announcement may only be made after consultation with the other party to this Agreement.

21.1.3.The provisions and restrictions in this clause 17 will continue to apply after the termination or expiry of this Agreement.

21.1.4.If either party makes an announcement pursuant to this clause 17 shall provide a copy of that announcement to the other party to this Agreement before the announcement is made unless this is not reasonably practicable, in which case, a copy of the announcement shall be so provided to the other party as soon as reasonably practicable.

21.1.5.Each party shall provide all such information known to it or, which on reasonable enquiry ought to be known to it as may reasonably be required by the other party in relation to the Services for the purposes of complying with the requirements of the law or any securities exchange or regulatory or governmental authority having jurisdiction over the Company or the Contractor as the case may be.

22.Assignment:

22.1.Neither party to this Agreement may assign any of its rights under this Agreement without the prior written consent of the other party except that the Company may assign the benefit of any provision of this Agreement to any Associated Company without the consent of the Contractor and such assignee shall be entitled to enforce the same rights against the Contractor as if it were named as the Company under this Agreement.

22.2.Subject to clause 18.1, this Agreement will be binding on and ensure for the benefit of the permitted assigns and successors in title to each of the parties and references to the parties will be construed accordingly.

23.Costs and Expenses:

23.1.Each party to this Agreement shall pay its own costs of and incidental to this Agreement and its implementation.

24.Severability:

24.1.All the terms and provisions of this Agreement are distinct and severable, and if any term or provision is held or declared to be unenforceable, illegal or void in whole or in part by any court, regulatory authority or other competent authority, it will to that extent only, be deemed not to form part of this Agreement, and the enforceability, legality and validity of the remainder of this Agreement will not in any event be affected. However, if as a result of the operation of this clause the rights or obligations of a party are materially altered to the detriment of that party, that

party may terminate this Agreement within 30 days from the date of the relevant decision of the relevant court, regulatory authority or other competent authority.

25.Whole Agreement:

25.1.This Agreement (together with any documents to be executed pursuant to the terms of this Agreement) supersede all prior representations, arrangements, understandings and agreements, and sets out the entire, complete and exclusive agreement and understanding between the parties. The rights of the Company under this Agreement are independent, cumulative and without prejudice to all other rights available to it whether as a matter of common law, statute, custom or otherwise.

26.Forbearance and Waiver

26.1.No waiver by the Company in respect of any breach of this Agreement by the Contractor will operate as a waiver in respect of any subsequent breach. No failure or delay by the Company in exercising any right or remedy will operate as a waiver thereof, nor will any single or partial exercise or waiver of any right or remedy prejudice its further exercise or the exercise of any other right or remedy.

27.Force Majeure:

27.1.If either party is affected by Force Majeure it shall forthwith notify the other party of the nature and extent thereof.

27.2.Neither party shall be deemed to be in breach of this Agreement, or otherwise be liable to the other, by reason of any delay in performance, or non-performance of its obligations hereunder to the extent that such delay or non-performance is due to any Force Majeure of which it has notified the other party, and the time for performance of that obligation shall be extended accordingly.

27.3.If the Force Majeure in question prevails for a continuous period in excess of six months the parties shall enter into bona fide discussions with a view to alleviating its effects, or to agreeing upon such alternative arrangements as may be fair and reasonable.

28.Notices:

28.1.Any notice given under this agreement shall be in writing and signed by or on behalf of the party giving it and shall be served by delivering it personally, or sending it registered post to the Company's registered office for the time being and / or address given in this agreement in the case of the Contractor or by sending it by fax to the fax number notified by the relevant party to the other party. Any such notice shall be deemed to have been received:

28.1.1.if delivered personally, at the time of delivery;

28.1.2.in the case of registered post, 48 hours from the date of posting; and

28.1.3.in the case of fax, at the time of transmission.

28.2.In proving such service it shall be sufficient to prove that the envelope containing the notice was addressed to the address of the relevant party and delivered either to that address or into the custody of the postal authorities as registered post or that the notice was transmitted by fax to the fax number of the relevant party.

29.Variation:

29.1.No variation of this agreement or of any document referred to in it shall be valid unless it is in writing and signed by or on behalf the parties.

30.Third Party Rights:

30.1.A person/entity who is not a party to this agreement shall not have any rights under or in connection with it.

31.Counterparts:

31.1.This Agreement may be executed in any number of counterparts, and by the several parties to it on separate counterparts, each of which when so executed will constitute an original but all of which together will evidence the same agreement.

32.Governing Law:

32.1.This Agreement and all relationships created by it will in all respects be governed by and construed in accordance with Irish law.

33.Jurisdiction:

33.1.1.The Irish courts will have exclusive jurisdiction to settle any dispute (Dispute) which may arise out of or in connection with this Agreement or its performance.

33.1.2.The parties agree that the Irish courts are the most appropriate and convenient courts to settle any Dispute and therefore that they will not argue to the contrary.

33.1.3.This clause is for the exclusive benefit of the Company and it will not prevent the Company from initiating proceedings in relation to a Dispute (Proceedings) in any other court of competent jurisdiction. To the extent permitted by law, the Company may take concurrent Proceedings in any number of jurisdictions.

IN WITNESS whereof this Agreement has been entered into on the date first herein written.

SIGNED on behalf of the Company

in the presence of: Kevin Dalton

/s/ Corey Fishman

…...........................................

Signature

Director

…...........................................

Title

SIGNED By Contractor

in the presence of: William Dunne

/s/ Michael Dunne

…...........................................

Signature

SCHEDULE 1

FEES

A monthly fee of $5,000 will be payable to the Contractor effective from the first full month following the Commencement Date

SCHEDULE 2

SERVICES

To provide general support and strategic advice to the Company in connection with the potential resubmission of the NDA for oral sulopenem including in connection with the design and conduct of a Phase III clinical trial to support such potential resubmission.

SCHEDULE 3

DATA PRIVACY NOTICE

Workplace Privacy Notice

1What is the purpose of this document?

This Privacy Notice describes how we collect and use personal data about you during and after your working relationship with us, in accordance with data protection law. This Privacy Notice applies to all employees, former employees, interns, agency workers and contractors.

Iterum Therapeutics International Limited, with company number 564304 and registered office at Block 2, Third Floor, Harcourt Centre, Harcourt Street, Dublin 2, Ireland (“Iterum”; “we”, “us” and “our”) is a "controller" of your employment related personal data. This means that we are responsible for deciding how we hold and use your personal data.

We use personal data that we receive as part of the recruitment and on-boarding processes, together with additional personal data we receive throughout the course of our working relationship with you (e.g. so we can pay salaries, participation in benefit schemes, performance reviews, disciplinary processes etc.). The personal data we receive is mostly processed for managing our workforce, performance of employment contracts and to comply with our legal obligations as an employer.

This Privacy Notice sets out the information that we must provide to you in accordance with Irish data protection laws, including the General Data Protection Regulation (EU) 2016/679 (“GDPR”) and the Data Protection Acts 1988 to 2018, as these laws may be amended and supplemented from time to time (“data protection law”). You have certain rights in respect of your personal data, which are described in this Privacy Notice.

This Privacy Notice does not form part of any contract of employment or other contract to provide services.

It is important that you read and retain this Privacy Notice, together with any other privacy notice we may provide on specific occasions when we are collecting or processing personal data about you, so that you are aware of how and why we are using that information and what your rights are under data protection law.

2Who does this Privacy Notice apply to?

This Privacy Notice applies to individuals who work for us, whether they are employees, interns, contractors and/or agency workers. It covers personal data of former employees, and also third parties whose information you provide to us in connection with the employment relationship (e.g. your emergency contacts’ and beneficiaries’ personal data).

3The types of personal data we receive about you

“Personal data” means any information about an individual from which that person can be identified. It does not include data where the identity has been removed (anonymous data).

There are certain types of personal data which require a higher level of protection under data protection law, such as information about a person's health, ethnicity, religious beliefs, and trade union membership.

Throughout this Privacy Notice we use the term "processing" to refer to all activities involving your personal data, including collecting, handling, storing, sharing, accessing, using, transferring, erasing and disposing of it.

We will receive and process the following categories of personal data about you:

•Recruitment / Selection Data personal data contained in your job application; CV; record of interview; verification documentation; copies of right to work documentation; copy passport or other identification, work history, references and other personal data included in a cover letter, communications or as part of the application and selection process.

•Professional Qualifications such as colleges attended, professional qualifications and memberships, professional and/or academic transcripts.

•Identity and Contact Data such as your name, title, date of birth, addresses, telephone numbers, personal email addresses, and national identification number.

•Your Personal Image by way of photographs taken at business social events you attend; photographs included on our intranet, email and website; and photographs for marketing materials/communications.

•Emergency Contact Data such as the name and telephone number of your next of kin or the emergency contact(s) you nominate.

•Dependent Data such as civil/marital status, marriage certificate and dependants.

•Work Details such as work contact details; location of employment or workplace; employee number; job title; job description; reporting lines; working hours; your terms and conditions of employment; notification of relationship with a colleague and other personal data held for other legitimate purposes consequent to your employment/engagement with us.

•Employment Records such as start date and, if different, the date of your continuous employment; leaving date and your reason for leaving; holidays taken; training records; compensation history; termination arrangements (e.g. exit interview).

•Remuneration and Benefits Data such as salary, annual leave, pension and benefits information, participation in share or other work schemes; PPS number, PRSI number, VAT number (for certain contractors), bank account details, payroll records, time keeping records, tax status information and third party benefit recipient information.

•Performance Management Data such as performance assessments (including probationary assessments), feedback, appraisals, outputs from talent programs and performance management processes, and, where relevant, executive objective forms.

•ICT Data such as personal data related to your use of our information and communications systems including email and internet; your use of timekeeping systems and other information obtained through electronic means such as system login and access records; download and print records.

•CCTV Data namely your image and time of recording as captured by CCTV operated by the landlord of our business premises in and outside our business premises.

•Access Control Data namely access and security logs when you use any access control cards/fobs to gain entry to our offices.

•Workplace Health and Safety Data such as personal data obtained pursuant to safety audits, risk assessments and incident reports.

•Disciplinary and Grievance Data such as personal data contained in records (including correspondence, minutes of meetings, and reports) of allegations, investigations and proceedings, and their outcomes.

We may also receive and process special categories of personal data about you:

Special categories of personal data is personal data that reveals racial or ethnic origin, political opinions, religious or philosophical beliefs or trade union membership; genetic data; biometric data for the purpose of uniquely identifying a natural person; or data concerning health or a natural person’s sex life or sexual orientation.

We limit the collection of this kind of personal data from you. Typically, we will only receive the following types:

•Incapacity Data such as personal data contained in your absence records, medical forms or certificates and records relating to any medical treatment, disability and workplace adjustments or accommodations.

•Pre-employment Screening Data namely the results of any mandatory pre- employment drug testing following a formal job offer but prior to commencing employment.

•Intoxicant Data namely the results of any mandatory intoxicant and/or drugs testing conducted during your employment/engagement with us.

In some cases, providing your personal data is necessary to enter into your employment contract with us, or to comply with applicable law. If you do not provide us with this personal data, we may not be able to perform our contract with you.

You may sometimes provide us with personal data relating to third parties, such as your spouse, partner, dependents and other family members, for purposes of Human Resources administration and management, including the administration of benefits and to contact your next-of-kin in case of an emergency. Before giving us this information please inform those third parties that you intend to disclose their personal data to us, the purposes for this disclosure, and that their personal data will be used by us in accordance with this Privacy Notice.

4How we collect your personal data

We receive your personal data as part of the recruitment and on-boarding process. Typically, we receive your personal data from the following sources:

•The landlord of our business premises, if you visit our business premises and if we request from our landlord a copy of any security recordings containing CCTV Data for the purposes described in paragraphs 5 and 6 below

•Third parties who conduct pre-employment drug tests on our behalf

Your named referees

Persons who recommend you for employment

Recruitment agencies

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•You, as a job candidate (e.g. through employment related web forms and other direct communications with you)

Once you are working with us, we receive personal data from the following sources:

•You, the employee, intern, contractor or agency worker, in the course of job-related activities throughout the period of you working with us. For example, you will typically provide your personal data directly to your manager(s) or Human Resources contact, or through any Human Resources systems we operate, your participation in Human Resource processes, emails you send, and through written attendances from meetings you attend;

•From your colleagues and other personnel in the course of job-related activities and processes throughout the period of you working with us;

•From external third parties such as clients, business partners or regulatory bodies; medical reports and intoxicant and/or drugs tests reports from external professionals; tax authorities, insurance or benefit providers;

•Through access system and security logs when you use any of our information and communications systems, access control cards/fobs; time and attendance recording systems we operate; and

•The landlord of our business premises, if we request from our landlord a copy of any security recordings containing CCTV Data for the purposes described in paragraphs 5 and 6 below.

5Purposes for using your personal data

We will only use your personal data when the law allows or requires us to. In the majority of cases, the processing of your personal data will be justified for the legal grounds set out further below. In any event, to process your personal data, we will be relying on at least one of the following legal bases:

•processing is necessary to give effect to your contract of employment (for example, collecting bank account details to pay your salary, creating your information and communications systems access rights so you can carry out your duties, responding to grievances, managing beneficiary details, administering termination of employment and exit interviews);

•processing is necessary for us to comply with a legal obligation (e.g. administering mandatory benefits, reviewing eligibility for work, creating an employee record (including absences), addressing occupational health issues, managing professional qualifications, managing information and communications systems’ security, disclosing tax data to government authorities or salary information to a national insurance scheme);

•processing is in our legitimate interests as a business and as your employer/contracting customer and our interests are not overridden by your interests, fundamental rights or freedoms (e.g. assessing new job opportunities, managing and securing information and communications systems’ security; reviewing your performance at work, managing litigation or other legal requests).

The processing of special categories of personal data may be necessary in certain limited circumstances. To process a special category of personal data concerning you, we will rely on one of the following legal bases:

•In limited circumstances, your explicit consent;

•Where the processing is necessary for the purposes of exercising or performing any right or obligation which is given or imposed by law on an employer or the worker in connection with employment law or social welfare law;

•In respect of health related personal data only, the processing is necessary and proportionate for an occupational pension, retirement annuity contracts or any other pension arrangement;

•Where the processing is necessary for the purposes of preventive or occupational medicine and/or the assessment of your working capacity;

•Less commonly, we may process special categories of personal data where it is needed in relation to legal claims or where it is needed to protect your interests (or someone else's interests) and you are unable to give your consent, or where you have already made the information public.

6Legal bases for using your personal data

We have set out below a description of the ways we use your personal data, and which of the legal bases we rely on to do so. We have also identified what our legitimate interests are, where applicable. We may process your personal data for more than one lawful ground depending on the specific purpose for which it is necessary to use your personal data.

Purpose/activity	Type of personal data	Lawful basis for processing your personal data
To respond to your job application and to manage the recruitment process (e.g. assess your skills, qualifications and suitability for the role; checking you are legally entitled to work in Ireland; communicate with you about the recruitment process; communicate with your referees; keep records related to our hiring processes; comply with legal or regulatory requirements; to provide appropriate facilities and adjustments for your attendance at any interview; to obtain pre- employment drug test reports).	•Recruitment/ Selection Data •Professional Qualifications •Identity and Contact Data •Incapacity Data •Pre- employment Screening Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary for our legitimate interests (for running our business and to assess suitability of candidates). (c)Necessary to comply with a legal obligation. (d)Necessary for performance of an obligation which is imposed by law on an employer in connection with employment law. (e)Necessary for the assessment of working capacity.
Human resource management and management of our relationship with you (e.g. on-boarding staff; administering the contract we have entered into with you; recording notifications of relationship with a colleague; managing professional certifications / licenses and liaising with regulatory bodies on your	•Recruitment/ Selection Data •Professional Qualifications •Identity and Contact Data •Emergency Contact Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary for our legitimate interests (for running our business and to ensure a positive, enjoyable and effective working environment for staff). (c)Necessary to comply with a legal obligation. (d)Necessary for performance of an obligation which is imposed by law on an employer in connection with

behalf; education, training employment law.

and development requirements; business reorganisations and corporate transactions; organising and running staff social events).	•Dependent Data •Your Personal Image •Work Details •Employment Records •Remuneration and Benefits Data •Performance Management Data •ICT Data •Access Control Data •Incapacity Data •Workplace Health and Safety Data •Disciplinary and Grievance Data •Intoxicant Data	(e)Necessary for the assessment of working capacity. (f)Necessary to protect the vital interests of a data subject or of another natural person where the data subject is physically or legally incapable of giving consent.
Administering payroll; paying your salary, and reimbursable expenses and bonuses; if you are an employee or deemed employee for tax purposes, deducting tax and other contributions; to administer benefits including statutory maternity pay, statutory sick pay, pensions and related family/dependant benefits, and permanent health insurance	•Identity and Contact Data •Work Details •Remuneration and Benefits Data •Incapacity Data •Disciplinary and Grievance Data •Dependent Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary to comply with a legal obligation. (c)Necessary for performance of an obligation which is imposed by law on an employer in connection with employment law. (d)Necessary for the assessment of working capacity.

Providing and administering pension, insurance, share plans and other benefits to you; enrolling you in pensions and other benefits; liaising with the trustees or managers of a pension arrangement, your pension provider and any other provider of staff benefits	•Identity and Contact Data •Work Details •Remuneration and Benefits Data •Dependent Data •Incapacity Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary to comply with a legal obligation. (c)Necessary and proportionate for an occupational pension, retirement annuity contract or any other pension arrangement.
Business management and planning, including accounting and auditing; conducting performance reviews; managing performance and determining performance requirements; making decisions about salary reviews and compensation; assessing qualifications for a particular job or task, including decisions about promotions; and managing headcount	•Identity and Contact Data •Work Details •Employment Records •Remuneration and Benefits Data •Performance Management Data •Workplace Health and Safety Data •Disciplinary and Grievance Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary for our legitimate interests (for running our business and strategic planning). (c)Necessary to comply with a legal obligation.
Securing our information and communication systems and networks; securing our business premises and the persons and property inside our business premises and/or on surrounding areas; creating employee records on our Human Resources IT systems; creating IT and building access rights; monitoring use of our information and communication systems to ensure compliance with our IT and other policies (including those specified in	•Identity and Contact Data •ICT Data •CCTV Data •Access Control Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary for our legitimate interests (for running our business and to protect our property, assets, staff and others; and ensuring compliance with our employment handbook, IT and other policies). (c)Necessary to comply with a legal obligation.

our employee handbook); ensuring network and information security, including preventing unauthorised access to our computer and electronic communications systems and preventing malicious software distribution and cyber attacks
Marketing and business development including inclusion of your photograph in social media postings, publications and corporate websites	•Your Personal Image •Work Details	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary for our legitimate interests (for running our business and developing new business).
Creating and maintaining records relating to your absence from work (including for sickness, parental leave, discretionary leave, sabbaticals etc.)	•Identity and Contact Data •Work Details •Incapacity Data •Emergency Contact Data •Dependent Data •Workplace Health and Safety Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary to comply with a legal obligation. (c)Necessary for performance of an obligation which is imposed by law on an employer in connection with employment law. (d)Necessary for the assessment of working capacity.
Ensure your health and safety in the workplace and to assess your fitness to work, to provide appropriate workplace adjustments; ascertaining your fitness to work; complying with health and safety obligations; manage health and safety at work and report on incidents	•Identity and Contact Data •Work Details •Incapacity Data •Intoxicant Data •Workplace Health and Safety Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary to comply with a legal obligation. (c)Necessary for performance of an obligation which is imposed by law on an employer in connection with employment law. (d)Necessary for the assessment of working capacity.
Contacting family/next of kin in case of emergency	•Identity and Contact Data •Emergency Contact Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary for our legitimate interests (for running our business and protecting the interests and safety of staff).

	•Incapacity Data •Dependent Data	(c)Necessary to comply with a legal obligation. (d)Necessary to protect the vital interests of a data subject or of another natural person where the data subject is physically or legally incapable of giving consent.
Responding to and resolving grievances; investigate and respond to complaints from clients/customers/partners; conducting disciplinary and grievance processes; gathering evidence for possible grievance or disciplinary hearings; making decisions about your continued employment or engagement; making arrangements for the termination of working relationships	•Identity and Contact Data •Work Details •Employment Records •ICT Data •CCTV Data •Access Control Data •Workplace Health and Safety Data •Incapacity Data •Intoxicant Data •Disciplinary and Grievance Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary for our legitimate interests (for running our business and dealing effectively with grievances and disciplinary matters). (c)Necessary to comply with a legal obligation. (d)Necessary for performance of an obligation which is imposed by law on an employer in connection with employment law. (e)Necessary for the assessment of working capacity.
Dealing with legal disputes involving you, or other employees, workers and contractors, including accidents at work; to prevent fraud; conduct or assist with internal, government, law enforcement and other investigations	•Recruitment/ Selection Data •Professional Qualifications •Identity and Contact Data •Work Details •Employment Records •Remuneration and Benefits Data •Performance Management Data	(a)Performance of a contract with you, or in order to take steps at your request prior to entering into a contract. (b)Necessary for our legitimate interests (for running our business and to protect our property, assets, workforce and others). (c)Necessary to comply with a legal obligation. (d)Necessary for the establishment, exercise or defence of legal claims.

•Workplace Health and Safety Data

•Disciplinary and Grievance Data

•ICT Data

•Dependent Data

•CCTV Data

•Access Control Data

•Intoxicant Data

We may operate projects or arrangements in respect of which our workforce may be invited to participate. In exceptional circumstances, depending on the nature of the project or arrangement, it may be necessary to process your personal data in respect of which we need your consent. If your consent is needed, we will ask you for this separately to ensure that your consent is freely given, informed and explicit. Information regarding processing based on your consent will be provided to you at the time that consent is requested, along with details of any consequences of not providing consent.

We will only use your personal data for the purposes for which we collected it, unless we reasonably consider that we need to use it for another reason and that reason is compatible with the original purpose. If we need to use your personal data for an unrelated purpose, we will notify you and we will explain the legal basis which allows us to do so. Please note that we may process your personal data without your knowledge or consent, in compliance with the above rules, where this is required or permitted by law.

7Disclosures of your personal data

We may have to share your personal data with third parties, including third-party service providers and with other companies that are in the same corporate group as us (e.g. our holding company and our subsidiaries, and subsidiaries of our holding company). We require third parties to respect the security of your personal data and to treat it in accordance with applicable data protection law.

Except as set out in this Privacy Notice, we do not disclose to any third party personal data that we collect or you provide to us. We will share your personal data with third parties where required by law, where it is necessary to administer the working relationship with you or where we have a legitimate interest or other lawful reason for doing so.

We may have to share your personal data with the parties set out below for the purposes set out in the table in paragraphs 5 and 6 above.

•Internal third parties: We will share your personal data with other companies that are in the same corporate group as us:

(i)for global Human Resources planning and decision making, we will share some of your personal data with Iterum Therapeutics US Limited in the United States, which will be a joint controller of your personal data;

(ii)for the purposes of administering the Iterum employee share option plan, we will share some of your personal data with our parent company, Iterum Therapeutics plc;

(iii)for the provision of senior executive and management services, we will share your personal data with Iterum Therapeutics US Limited in the United States who provides us with the following senior executive and management services: Human Resources management;

(iv)for the provision of information and communications systems, maintenance and support and hosting of data, for example we will share your personal data with Iterum Therapeutics US Limited who provide us with the following services: IT services; hosting, access management, security and support of desktop applications, email services and other information and communication systems we make available to you;

(v)for certain Human Resources, payroll, benefits and administrative purposes. For example, we will share your personal data with Iterum Therapeutics US Limited who provides us with the following services in respect of our workforce’s personal data: payroll and financial administration services; staff training; administration of staff pensions and benefits; Human Resource support; and

(vi)in the context of a business reorganisation or a restructuring exercise.

•External third parties: We may share some of your personal data with professional advisors and companies that provide products and services to us. For example, the following activities are carried out by professional advisors and third-party service providers, which may involve their processing of your personal data in respect of the service they provide: pension administration and consultancy; benefits provision and administration; health insurance; IT services; cloud hosting services; employee share option plan administration; transfer agency services; payroll services; and legal and accounting services. Further, if you undergo a mandatory intoxicant and/or drugs test during your employment/engagement with us we will share your personal data with third parties who conduct these tests on our behalf.

•Public and Government Authorities: We may need to share your personal data with a regulator or to otherwise comply with the law. This may include making returns to Revenue.

•Corporate activity: We may share your personal data with other third parties in the context of the possible sale or restructuring of the business. In this circumstance we will, so far as possible, share anonymised data with the other parties before the transaction completes. Once the transaction is completed, we will share your personal data with the other parties if and to the extent required under the terms of the transaction.

We require all third parties to whom we disclose personal data to respect the security of personal data and to treat it in accordance with the law. We do not allow our service providers to use your personal data for their own purposes and only permit them to process your personal data for specified purposes and in accordance with our instructions. Unless prevented by applicable law, we will notify you when your personal data may be provided to third parties in ways other than explained above, and you may have the option to prevent this sharing at the time that we notify you.

8International transfers

As a multinational organisation there are times we will transfer your personal data outside the European Economic Area. If we do, you can expect a similar degree of protection in respect of your personal data.

We will transfer the personal data we collect about you to the United States, which is outside of the European Economic Area, for the purposes described in paragraphs 5 and 6 and to the recipients described in paragraph 7. There is not an adequacy decision by the European Commission in respect of the United States. This means that the United States is not deemed to provide an adequate level of protection for your personal data. However, to ensure that your personal data does receive an adequate level of protection we have put in place appropriate measures, namely the European Commission approved model contractual clauses, to ensure that your personal data is treated by those third parties in a way that is consistent with and which respects data protection law. If you require further information about this protective measure you can request it from Privacy@iterumtx.com.

9Data security

We have put in place measures to protect the security of your personal data. Details of these measures are available upon request. Third party service providers will only process your personal data on our instructions and where they have agreed to treat the information confidentially and to keep it secure.

We have put in place appropriate security measures to prevent your personal data from being accidentally lost, used or accessed in an unauthorised way, altered or disclosed. In addition, we limit access to your personal data to those employees, agents, contractors and other third parties who have a business need to know. Whilst we take appropriate security measures to protect all personal data, no data transmission or security system can be guaranteed to be 100% secure. Service providers will only process your personal data on our instructions and they are subject to obligations of confidentiality. All our third-party service providers are required to take appropriate security measures to protect personal data.

We have put in place procedures to deal with any suspected personal data breach and will notify you and the Data Protection Commission of a suspected breach where we are legally required to do so. If you have reason to believe that any of your personal data is no longer secure, please notify Privacy@iterumtx.comimmediately.

You also have an important role to play in protecting the security of your personal data, and you should take care about disclosing personal data, and how you protect your communications and devices. Please refer to the employee handbook and all data protection and security policies notified to you from time to time for more information about your responsibilities and ensure you attend all mandatory data protection and data security training sessions allocated to you.

10How long we keep your personal data

We will only retain your personal data for as long as necessary to fulfil the purposes we collected it for, including for the purposes of satisfying any legal, accounting, or reporting requirements.

To determine the appropriate retention period for personal data, we consider the amount, nature, and sensitivity of the personal data, the potential risk of harm from unauthorised use or disclosure of your personal data, the purposes for which we process your personal data and whether we can achieve those purposes through other means, and the applicable legal requirements.

In some circumstances we may anonymise your personal data so that it can no longer be associated with you, in which case we may use such information without further notice to you.

Once you are no longer an employee, worker or contractor of the company we will retain and securely destroy your personal data in accordance with applicable laws and regulations.

11Automated decision-making

Automated decision-making takes place when an electronic system uses personal data to make a decision without human intervention.

You will not be subject to decisions that will have a significant impact on you based solely on automated decision-making, unless we have a lawful basis for doing so and we have notified you. We do not envisage that any decisions will be taken about you using automated means, however we will notify you if this position changes.

12Your legal rights

Under certain circumstances, by law you have the right to:

Request access to your personal data (commonly known as a "data subject access request"). This enables you to request a copy of the personal data we hold about you and to check that we are lawfully processing it.

Request correction of the personal data that we hold about you. This enables you to have any incomplete or inaccurate personal data we hold about you corrected.

Request erasure of your personal data. This enables you to ask us to delete or remove personal data where there is no good reason for us continuing to process it. You also have the right to ask us to delete or remove your personal data where you have exercised your right to object to processing (see below).

Object to processing of your personal data where we are relying on a legitimate interest (or those of a third party) to process your personal data and there is something about your particular situation which makes you want to object to us processing your personal data on this legal ground.

Request restriction of processing of your personal data. This enables you to ask us to suspend the processing of your personal data in the following scenarios: (a) if you want us to establish the data's accuracy; (b) where our use of the personal data is unlawful but you do not want us to erase it; (c) where you need us to hold the personal data even if we no longer require it as you need it to establish, exercise or defend a legal claim; or (d) you have objected to our use of your personal data but we need to verify whether we have overriding legitimate grounds to use it.

Request the transfer of your personal data to you or to a third party. We will provide to you, or a third party you have chosen, your personal data in a structured, commonly used, machine-readable format. Note that this right only applies to automated information which you initially provided consent for us to use or where we processed the personal data to perform a contract with you.

Right to withdraw consent: In the limited circumstances where you may have provided your consent to the collection and processing of your personal data for a specific purpose, you have the right to withdraw your consent for that specific processing at any time. To withdraw your consent, please contact Privacy@iterumtx.com. Once we have received notification that you have withdrawn your consent, we will no longer process your personal data for the purpose or purposes you originally agreed to, unless we have another legitimate basis for doing so in law.

13Exercising your rights

To exercise one or more of your rights in respect of your personal data, please contact Privacy@iterumtx.com. You will not have to pay a fee to access your personal data (or to exercise any of the other personal data legal rights). However, we may charge a reasonable fee if your request for access is clearly unfounded or excessive. Alternatively, we may refuse to comply with the request in such circumstances.

14Contacting the data protection supervisory authority

You have the right to make a complaint at any time to the Data Protection Commission, the Irish supervisory authority for data protection issues (www.dataprotection.ie). We would, however, appreciate the chance to deal with your concerns before you approach the Data Protection Commission so please contact Privacy@iterumtx.comor a member of the Legal Team in the first instance.

15Updating your personal data

It is important that the personal data we hold about you is accurate and current. Please keep us informed if your personal data changes during your working relationship with us.

16Changes to this Privacy Notice

We reserve the right to update this Privacy Notice at any time. We will notify current employees in advance about any changes to this Privacy Notice that are material or may impact you.

17Who to contact?

If you have any questions about this Privacy Notice, including any requests to exercise your legal rights, please contact a member of our Privacy Team at Privacy@iterumtx.com.

I,(employee / worker / contractor name), acknowledge that on(date), I received a copy of this Privacy Notice for employees, workers and contractors and that I have read and understood it.

Signature

………………………………………………

Name

…………………………………………………

36

EX-23

EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements Nos. 333-257322, 333-261558, 333-225236, 333-230496, 333-237198, and 333-245655 on Form S-8 and No. 333-267795 on Form S-3 of our report dated March 16, 2023, with respect to the consolidated financial statements of Iterum Therapeutics plc.

/s/ KPMG

Dublin, Ireland

March 16, 2023

EX-31

Exhibit 31.1

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Corey Fishman, certify that:

1.I have reviewed this Annual Report on Form 10-K of Iterum Therapeutics plc;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 16, 2023	By:	/s/ Corey Fishman
		Corey Fishman
		President and Chief Executive Officer (Principal Executive Officer)

EX-31

Exhibit 31.2

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Judith Matthews, certify that:

1.I have reviewed this Annual Report on Form 10-K of Iterum Therapeutics plc;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 16, 2023	By:	/s/ Judith Matthews
		Judith Matthews
		Chief Financial Officer (Principal Financial and Accounting Officer)

EX-32

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Iterum Therapeutics plc (the “Company”) for the year ended December 31, 2022, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Corey Fishman, President and Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge on the date hereof:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 16, 2023	By:	/s/ Corey Fishman
		Corey Fishman
		President and Chief Executive Officer (Principal Executive Officer)

EX-32

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Iterum Therapeutics plc (the “Company”) for the year ended December 31, 2022, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Judith Matthews, Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to her knowledge on the date hereof:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 16, 2023	By:	/s/ Judith Matthews
		Judith Matthews
		Chief Financial Officer (Principal Financial and Accounting Officer)

XML

Document and Entity Information - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2022

Feb. 28, 2023

Jun. 30, 2022

Cover [Abstract]

Document Type

10-K

Amendment Flag

false

Document Period End Date

Dec. 31, 2022

Document Fiscal Year Focus

2022

Document Fiscal Period Focus

FY

Trading Symbol

ITRM

Entity Registrant Name

Iterum Therapeutics plc

Entity Central Index Key

0001659323

Current Fiscal Year End Date

--12-31

Entity Well-known Seasoned Issuer

No

Entity Current Reporting Status

Yes

Entity Voluntary Filers

No

Entity Filer Category

Non-accelerated Filer

Entity Small Business

true

Entity Emerging Growth Company

true

Entity Ex Transition Period

true

ICFR Auditor Attestation Flag

false

Entity Shell Company

false

Entity Interactive Data Current

Yes

Title of 12(b) Security

Ordinary Shares, $0.01 par value per share

Security Exchange Name

NASDAQ

Entity File Number

001-38503

Entity Incorporation, State or Country Code

L2

Entity Tax Identification Number

98-1283148

Entity Address, Address Line One

Fitzwilliam Court

Entity Address, Address Line Two

1st Floor

Entity Address, Address Line Three

Leeson Close

Entity Address, City or Town

Dublin 2

Entity Address, Country

IE

Entity Address, Postal Zip Code

Not applicable

City Area Code

+353

Local Phone Number

1 669-4820

Document Annual Report

true

Document Transition Report

false

Entity Common Stock, Shares Outstanding

12,705,961

Auditor Firm ID

1116

Auditor Name

KPMG

Auditor Location

Dublin, Ireland

Entity Public Float

$ 36.7

Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Part III of this Annual Report on Form 10-K incorporates by reference information from the definitive proxy statement for the Registrant’s 2023 Annual Meeting of Shareholders, which is expected to be filed with the Securities and Exchange Commission not later than 120 days after the Registrant’s fiscal year ended December 31, 2022.

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 21,092	$ 27,446
Short-term investments	39,712	53,898
Prepaid expenses and other current assets	1,338	1,922
Income taxes receivable	302
Total current assets	62,444	83,266
Intangible asset, net	1,719	3,435
Property and equipment, net	69	91
Restricted cash	34	64
Other assets	2,567	4,653
Total assets	66,833	91,509
Current liabilities:
Accounts payable	2,774	878
Accrued expenses	4,346	1,165
Derivative liability	196	6,058
Current portion of long-term debt		1,627
Other current liabilities	1,748	2,992
Income taxes payable		221
Total current liabilities	9,064	12,941
Long-term debt, less current portion	10,094	6,930
Royalty-linked notes	18,372	17,968
Other liabilities	1,304	3,436
Total liabilities	38,834	41,275
Commitments and contingencies (Note 15)
Shareholders' equity
Undesignated preferred shares, $0.01 par value per share: 100,000,000 shares authorized at December 31, 2022 and December 31, 2021; no shares issued at December 31, 2022 and December 31, 2021
Ordinary shares, $0.01 par value per share: 20,000,000 shares authorized at December 31, 2022 and December 31, 2021, 12,598,641 shares issued at December 31, 2022; 12,185,019 shares issued at December 31, 2021	126	122
Additional paid-in capital	451,150	428,605
Accumulated deficit	(422,927)	(378,493)
Accumulated other comprehensive loss	(350)
Total shareholders' equity	27,999	50,234
Total liabilities and shareholders' equity	$ 66,833	$ 91,509

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Aug. 17, 2022	Dec. 31, 2021	Jan. 28, 2021
Statement of Financial Position [Abstract]
Undesignated preferred shares, par value	$ 0.01		$ 0.01
Undesignated preferred shares, authorized	100,000,000		100,000,000
Undesignated preferred shares issued	0		0
Ordinary shares, par value	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Ordinary shares, shares authorized	20,000,000		20,000,000
Ordinary shares, shares issued	12,598,641		12,185,019

XML

Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating expenses:
Research and development	$ (17,617)	$ (10,712)	$ (21,074)
General and administrative	(12,766)	(13,825)	(11,052)
Total operating expenses	(30,383)	(24,537)	(32,126)
Operating loss	(30,383)	(24,537)	(32,126)
Interest expense, net	(2,361)	(5,553)	(15,097)
Financing transaction costs			(2,848)
Adjustments to fair value of derivatives	5,458	(60,964)	(1,745)
Cancellation of share options	(17,350)
Extinguishment of debt			340
Other income, net	503	195	213
Total other expense	(13,750)	(66,322)	(19,137)
Loss before income taxes	(44,133)	(90,859)	(51,263)
Income tax expense	(301)	(705)	(743)
Net loss	$ (44,434)	$ (91,564)	$ (52,006)
Net loss per share - basic	$ (3.63)	$ (8.41)	$ (32.49)
Net loss per share - diluted	$ (3.63)	$ (8.41)	$ (32.49)
Weighted average ordinary shares outstanding - basic	12,236,607	10,891,178	1,600,655
Weighted average ordinary shares outstanding - diluted	12,236,607	10,891,178	1,600,655
Statement of Comprehensive Income [Abstract]
Net loss	$ (44,434)	$ (91,564)	$ (52,006)
Unrealized loss on marketable securities	(350)
Comprehensive loss	$ (44,784)	$ (91,564)	$ (52,006)

XML

Consolidated Statements of Shareholders' Equity / (Deficit) - USD ($) $ in Thousands	Total	Ordinary Shares	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2019	$ (26,238)	$ 10	$ 208,675	$ (234,923)
Beginning balance (in shares) at Dec. 31, 2019		991,265
Issuance of ordinary shares, net	13,332	$ 23	13,309
Issuance of ordinary shares, net (in shares)		2,304,137
Share-based compensation expense	2,759		2,759
Issuance of warrants for ordinary shares	11,594		11,594
Net loss	(52,006)			(52,006)
Ending balance at Dec. 31, 2020	(50,559)	$ 33	236,337	(286,929)
Ending balance (in shares) at Dec. 31, 2020		3,295,402
Issuance of ordinary shares, net	68,162	$ 39	68,123
Issuance of ordinary shares, net (in shares)		3,879,300
Share-based compensation expense	4,319		4,319
Issuance of warrants for ordinary shares	6,199		6,199
Exercise of warrants for ordinary shares	15,289	$ 14	15,275
Exercise of warrants for ordinary shares (in shares)		1,417,761
Issuance of ordinary shares on conversion of exchangeable notes	98,388	$ 36	98,352
Issuance of ordinary shares on conversion of exchangeable notes (in shares)		3,592,556
Net loss	(91,564)			(91,564)
Ending balance at Dec. 31, 2021	50,234	$ 122	428,605	(378,493)
Ending balance (in shares) at Dec. 31, 2021		12,185,019
Issuance of ordinary shares, net	441	$ 4	437
Issuance of ordinary shares, net (in shares)		413,622
Share-based compensation expense	$ 4,758		4,758
Issuance of ordinary shares on conversion of exchangeable notes (in shares)	3,592,555
Cancellation of share options	$ 17,350		17,350
Net loss	(44,434)			(44,434)
Unrealized loss on available-for-sale securities	(350)				$ (350)
Ending balance at Dec. 31, 2022	$ 27,999	$ 126	$ 451,150	$ (422,927)	$ (350)
Ending balance (in shares) at Dec. 31, 2022		12,598,641

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (44,434)	$ (91,564)	$ (52,006)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation	84	391	161
Amortization	1,716	1,713
Share-based compensation expense	4,758	4,319	2,759
Cancellation of share options expense	17,350
Amortization of short-term investments	(183)	636
Interest on short-term investments	(55)	(290)
Amortization of debt discount and deferred financing costs	2,338	4,097	10,929
Financing transaction costs included in financing activities			2,848
Adjustments to fair value of derivatives	(5,458)	60,964	1,745
Extinguishment of debt			(340)
Other	2,281	3,254	752
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,551)	1,008	1,671
Other assets		(8)	308
Accounts payable	1,895	63	(14,671)
Accrued expenses	3,185	(662)	(10,628)
Income taxes	(510)	271	(120)
Other liabilities	(708)	(1,112)	(1,116)
Net cash used in operating activities	(18,473)	(15,842)	(54,528)
Cash flows from investing activities:
Purchases of property and equipment	(62)	(61)	(11)
Purchases of short-term investments	(45,708)	(67,034)
Proceeds from sale of short-term investments	59,727	12,500
Net cash (used in) / provided by investing activities	13,957	(54,595)	(11)
Cash flows from financing activities:
Proceeds from PPP Loan			744
Repayments of long-term debt	(2,251)	(6,516)	(6,233)
Proceeds from private placement and rights offering, net of transactions costs			45,038
Proceeds from issuance of ordinary shares, net of transaction costs	433	89,643	24,926
Net cash (used in) provided by financing activities	(1,818)	83,127	64,475
Effect of exchange rates on cash and cash equivalents	(50)	4	(11)
Net increase / (decrease) in cash, cash equivalents and restricted cash	(6,384)	12,694	9,925
Cash, cash equivalents and restricted cash, at beginning of period	27,510	14,816	4,891
Cash, cash equivalents and restricted cash, at end of period	21,126	27,510	14,816
Supplemental Disclosure of Cash Flow Information:
Income tax paid—U.S.	821	435	120
Interest paid	22	416	996
Exchangeable Notes
Adjustments to reconcile net loss to cash used in operating activities:
Interest on exchangeable notes - non-cash	$ 819	$ 1,078	$ 3,180

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Nature of Operations and Basis of Presentation

12 Months Ended

Dec. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations and Basis of Presentation

(1)Nature of Operations and Basis of Presentation

Iterum Therapeutics plc (the Company) was incorporated under the laws of the Republic of Ireland in June 2015 as a limited company and re-registered as a public limited company on March 20, 2018. The Company maintains its registered office at Fitzwilliam Court, 1st Floor, Leeson Close, Dublin 2, Ireland. The Company commenced operations in November 2015. The Company licensed global rights to its novel anti-infective compound, sulopenem, from Pfizer Inc. (Pfizer). The Company is a clinical-stage pharmaceutical company dedicated to developing and commercializing sulopenem to be potentially the first oral penem available in the United States and the first and only oral and intravenous (IV) branded penem available globally.

Since inception, the Company has devoted substantially all of its efforts to research and development, recruiting management and technical staff, and raising capital, and has financed its operations through the issuance of ordinary and convertible preferred shares, debt raised under a financing arrangement with Silicon Valley Bank (SVB) including the Paycheck Protection Program loan (PPP loan), a sub-award from the Trustees of Boston University under the Combating Antibiotic Resistant Bacteria Biopharmaceutical Accelerator (CARB-X) program and the proceeds of a private placement (Private Placement) and subsequent rights offering (Rights Offering) pursuant to which its wholly owned subsidiary, Iterum Therapeutics Bermuda Limited (Iterum Bermuda) issued and sold approximately $51.8 million aggregate principal amount of 6.500% Exchangeable Senior Subordinated Notes due 2025 (Exchangeable Notes) and $0.1 million aggregate principal amount of Limited Recourse Royalty-Linked Subordinated Notes (the RLNs and, together with the Exchangeable Notes, the Securities). The Company has not generated any product revenue. The Company is subject to risks and uncertainties common to early-stage companies in the pharmaceutical industry, including, but not limited to, the ability to secure additional capital to fund operations, failure to achieve regulatory approval, failure to successfully develop and commercialize its product candidates, development by competitors of new technological innovations, dependence on key personnel, protection of proprietary technology and compliance with government regulations. Product candidates currently under development will require additional research and development efforts, including regulatory approval prior to commercialization.

Even if the Company’s product development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales.

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and include the accounts of the Company and its subsidiaries. Certain reclassifications have been made to prior period amounts to conform with the current period's presentation, including in connection with the application of the hierarchy for fair value measurements of short-term investments, and the classification, amortised cost and unrealized gains and losses of short-term investments.

The Company's shareholders approved a reverse share split of the Company's ordinary shares on June 15, 2022, which became effective on August 17, 2022, (the Reverse Share Split). As of 5:00 p.m. Eastern Standard Time on August 17, 2022, every fifteen ordinary shares of $0.01 each (nominal value) in the authorized and unissued and authorized and issued share capital of the Company were consolidated into one ordinary share of $0.15 each (nominal value), and the nominal value of each ordinary share was subsequently reduced from $0.15 to $0.01 nominal value per share. No fractional shares were issued to any shareholders in connection with the Reverse Share Split. Shareholders who were otherwise entitled to receive a fractional ordinary share instead received a cash payment in an amount equal to the net cash proceeds attributable to the sale of such fractional entitlement following aggregation and sale by the Company on behalf of each of the relevant shareholders of the Company's ordinary shares, on the basis of prevailing market prices at such time. As the par value per share of the Company's shares remained at $0.01 per share following the Reverse Share Split, the difference between the total share capital at (par value) prior to the Reverse Share Split and the total share capital (par value) after the Reverse Share Split, has been reclassified as additional paid-in-capital on a retroactive basis. The number of ordinary shares reserved for issuance upon exercise of the Exchangeable Notes, outstanding share options and warrants or upon the vesting of outstanding restricted share units, was adjusted and proportionately decreased and the exercise price of all share options, Exchangeable Notes and warrants was proportionately increased. Additionally, the number of shares that may be the subject of future grants under our share plans was proportionally decreased. Accordingly, all historical share and per share information related to the issued and outstanding ordinary shares, the Exchangeable Notes, share options, restricted share units, warrants and shares reserved for future issuance under the Company's share plans have been adjusted to reflect the Reverse Share Split for all prior periods presented.

The Company filed a universal shelf registration statement on Form S-3 with the SEC, which was declared effective on October 17, 2022 (File No. 333-267795), and pursuant to which the Company registered for sale up to $100.0 million of any combination of debt securities, ordinary shares, preferred shares, subscription rights, purchase contracts, units and/or warrants from time to time and at prices and on terms that the Company may determine. On October 7, 2022, the Company entered into a sales agreement with H.C. Wainwright & Co., LLC (HC Wainwright), as agent, pursuant to which the Company may offer and sell ordinary shares, nominal value $0.01 per share, for aggregate gross sales proceeds of up to $16.0 million (subject to the availability of ordinary shares), from time to time through HC Wainwright by any method permitted that is deemed to be an "at the market offering" as defined in Rule 415 (a)(4) promulgated under the Securities Act of 1933, as amended.

In accordance with Accounting Standards Update (ASU) 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (Subtopic 205-40), the Company has evaluated whether there are conditions and events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year of the date of issue of the consolidated financial statements.

The Company has funded its operations to date primarily with proceeds from the sale of preferred shares and ordinary shares, warrants, debt raised under its financing arrangement with SVB including the PPP loan (both of which have been repaid), payments received under the CARB-X program and proceeds of the Private Placement and Rights Offering. The Company has incurred operating losses since inception, including net losses of $44,434, $91,564 and $52,006 for the years ended December 31, 2022, 2021 and 2020, respectively. The Company had an accumulated deficit of $422,927 as of December 31, 2022 and expects to continue to incur net losses for the foreseeable future. Management believes that its cash and cash equivalents balance of $21,092 and short-term investments of $39,712 at December 31, 2022 are sufficient to fund operations until mid-2024. In making this assessment management have considered the planned operations of the company and the ability to adjust its plans if required.

In addition, in parallel, the Company is evaluating its corporate, strategic, financial and financing alternatives, with the goal of maximizing value for its stakeholders. These alternatives could potentially include the licensing, sale or divestiture of the Company’s assets or proprietary technologies, a sale of the Company, a merger or other business combination or another strategic transaction involving the Company. The evaluation of corporate, strategic, financial and financing alternatives may not result in any particular action or any transaction being pursued, entered into or consummated, and there is no assurance as to the timing, sequence or outcome of any action or transaction or series of actions or transactions.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

(2)Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, the valuation of share-based compensation awards, the valuation of the RLNs and the Derivative liabilities, which consist of embedded features in the Exchangeable Notes, and the accrual for research and development expenses. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates as there are changes in circumstances, facts and experience. Actual results could differ materially from those estimates.

Specifically, management has estimated variables used to calculate the discounted cash flow analysis (DCF) and assumptions used in the binomial option pricing model to value derivative instruments (see Note 3 – Fair Value of Financial Assets and Liabilities).

Comprehensive Loss

Comprehensive loss includes net loss as well as other changes in stockholders’ equity that result from transactions and economic events other than those with shareholders. For the year ended December 31, 2022, these changes related to unrealized gains and losses on the Company’s available-for-sale short-term investments. For the year ended December 31, 2021, there was no difference between net loss and comprehensive loss. There were no reclassifications out of comprehensive loss for the years ended December 31, 2022 and 2021.

Consolidation

The accompanying consolidated financial statements include the accounts of Iterum Therapeutics plc and its wholly owned subsidiaries (which are referred to herein, collectively, as the Company where context requires). All significant intercompany balances and transactions have been eliminated on consolidation. The Company has no involvement with variable interest entities.

Short-term Investments

The Company's investments consist primarily of debt securities, including investment-grade corporate bonds. The Company considers its portfolio of investments to be available-for-sale. Accordingly, these investments are recorded at fair value, which is based on quoted market prices. Investments with maturities beyond one year are generally classified as short term, based on their highly liquid nature and because such marketable securities represent the investment of cash that is available for current operations. Unrealized gains and losses are reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity.

Realized gains and losses and declines in value are included as a component of other income (expense), net based on the specific identification method. Any credit impairments are recorded through an allowance account.

Cash and Cash Equivalents

The Company’s cash and cash equivalents consist of cash balances and highly liquid investments with maturities of three months or less at the date of purchase. Accounts held at U.S. financial institutions are insured by the Federal Deposit Insurance Corporation (FDIC) up to $250, while accounts held at Irish financial institutions are insured under the Deposit Guarantee Scheme up to $107 (€100).

Cash accounts with any type of restriction are classified as restricted cash. If restrictions are expected to be lifted in the next twelve months, the restricted cash account is classified as current. Included within restricted cash on the Company’s consolidated balance sheet is $17 and $17 for the years ended December 31, 2022 and 2021, respectively, relating to the warrants issued on June 5, 2020 pursuant to the securities purchase agreement (June 3, 2020 SPA) in the June 3, 2020 registered direct offering (June 3, 2020 Offering), $6 and $6 for the years ended December 31, 2022 and 2021, respectively, relating to the warrants issued on July 2, 2020 pursuant to the securities purchase agreement (June 30, 2020 SPA) in the June 30, 2020 registered direct offering (June 30, 2020 Offering) and $11 and $11 for the years ended December 31, 2022 and 2021, respectively, relating to warrants issued in the underwritten offering in October 2020 (October 2020 Offering). On the closing date of each of the registered direct offerings in June 2020 (June 3 Offering) and July 2020 (June 30 Offering) and the underwritten offering in the October 2020 Offering, each investor deposited $0.01 per warrant issued being the nominal value of the underlying ordinary share represented by each warrant. This amount will be held in trust by the Company pending a decision by the relevant investor to exercise the warrant by means of a “cashless exercise” pursuant to the terms of the warrant, in which case the $0.01 will be used to pay up the nominal value of the ordinary share issued pursuant to the warrant. Upon the exercise of the warrants other than by means of a "cashless exercise", the amount held in trust will be returned to the relevant investor in accordance with the terms of the applicable purchase agreement or prospectus. Also included within restricted cash on the Company’s consolidated balance sheet is a certificate of deposit for $30 for the year ended December 31, 2021, which was being held by a third party bank as collateral for the irrevocable letter of credit issued in March 2018 to secure an office lease (see Note 8 – Leases).

Foreign Currencies

Items included in the consolidated financial statements are measured using the currency of the primary economic environment in which the entity operates (functional currency). The consolidated financial statements are presented in U.S. dollars.

Transactions in foreign currencies are recorded at the rate of exchange at the date of the transaction. Monetary assets and liabilities denominated in foreign currencies at the balance sheet date are retranslated into the functional currency at the rate of exchange at the balance sheet date, and the resulting gains and losses are recognized in the consolidated statement of operations and comprehensive loss. Non-monetary items in a foreign currency that are measured in terms of historical cost are translated using the exchange rate at the date of transaction.

Intangible Assets

The Company’s finite-lived intangible asset is stated at cost less accumulated amortization. The Company calculates amortization expense using the straight-line method over the estimated useful life of the related asset which the Company believes reasonably represents the time period in which the economic benefit of the intangible asset is consumed or otherwise realized. The Company reviews the recoverability of the finite-lived intangible asset and, when there are indications that this asset is more likely than not to have become impaired, will test for impairment.

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation. Property and equipment are depreciated using the straight-line method over the estimated useful life of each asset as follows:

	Estimated Useful Life
Leasehold improvements	Shorter of life of lease or 10 years
Furniture and fixtures	5 years
Laboratory equipment	5 years
Computer equipment	3 years

Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is included in loss from operations. Repairs and maintenance costs are expensed as incurred. The Company reviews the recoverability of all long-lived assets, including the related useful life, whenever events or changes in circumstances indicate that the carrying amount of a long-lived asset might not be recoverable.

Leases

The Company determines if an arrangement contains a lease at inception. For arrangements that contain a lease, lease classification, recognition, and measurement are determined at the lease commencement date. The Company has elected to separately account for lease and non-lease components in determining the lease liabilities and right-of-use assets. Lease liabilities and their corresponding right-of-use assets are recorded based on the present value of lease payments over the expected lease term. The Company’s lease agreements generally do not provide an implicit borrowing rate, therefore the Company uses its incremental borrowing rate at lease commencement to determine the present value of lease payments. The incremental borrowing rate is an entity-specific rate which represents the rate of interest a lessee would pay to borrow on a collateralized basis over a similar term with similar payments. All operating lease expenses are recognized on a straight-line basis over the lease term.

Research and Development Expenses

The Company expenses the cost of research and development as incurred. Research and development expenses comprise costs incurred in performing research and development activities, including salaries, share-based compensation and benefits, facilities costs, depreciation, amortization, manufacturing expenses and external costs of third-parties engaged to supply active pharmaceutical ingredient and drug product and conduct preclinical and clinical development activities and trials, as well as the cost of licensing technology, license fees, and other external costs. Advance payments for goods and services that will be used in future research and development activities are recorded as prepaid expenses and expensed when the activity is performed or when the goods have been received.

Accrued Research and Development Expenses

The Company has entered into various research and development contracts with research institutions and other companies. These agreements are generally cancelable, and related payments are recorded as research and development expenses as incurred. This process involves reviewing open contracts and purchase orders, communicating with Company personnel to identify services that have been performed on the Company’s behalf and estimating the level of service performed and the associated cost incurred for the service when the Company has not yet been invoiced or otherwise notified of actual costs. The majority of the Company’s service providers invoice in arrears for services performed, on a pre-determined schedule or when contractual milestones are met; however, some require advanced payments. The Company estimates accrued expenses as of each balance sheet date in the consolidated financial statements based on facts and circumstances known at that time. It periodically confirms the accuracy of these estimates with the service providers and makes adjustments if necessary. Examples of estimated accrued research and development expenses include fees paid to:

•Vendors, including central laboratories, in connection with preclinical development activities;

•Clinical Research Organizations, or CROs, and investigative sites in connection with preclinical studies and clinical trials; and

•Contract Manufacturing Organizations, or CMOs, in connection with drug substance and drug product formulation of preclinical and clinical trial materials.

The Company bases expenses related to preclinical studies and clinical trials on estimates of the services received and efforts expended pursuant to quotes and contracts with multiple research institutions and CROs that conduct and manage preclinical studies and clinical trials on its behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to vendors will exceed the level of services provided and result in a prepayment of the expense. Payments under some of these contracts depend on factors such as the successful enrollment of patients and the completion of clinical trial milestones. In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, the accrual or the amount of prepaid expenses is adjusted accordingly. Although the Company does not expect the estimates to be materially different from amounts actually incurred, its understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in reporting amounts that are too high or too low in any particular period. To date, there have not been any material adjustments to prior estimates of accrued research and development expenses.

Patent Costs

All patent related costs incurred in connection with filing and prosecuting patent applications are expensed as incurred due to the uncertainty about the recovery of the expenditure. Amounts incurred are classified as general and administrative expenses.

Share-Based Compensation

The Company measures share-based awards granted to employees and directors with service based vesting conditions only based on the fair value on the date of grant using the Black-Scholes option-pricing model. Compensation expense of those awards is recognized over the requisite service period, which is generally the vesting period of the respective award, using the straight-line method.

The Company measures share-based awards granted to employees and directors with both performance and service based vesting conditions based on the fair value on the date of grant using the Monte Carlo simulation model. Compensation expense of those awards is recognized over the determined vesting period, the period over which all the specified vesting conditions are to be satisfied, using the straight-line method.

For awards granted to consultants and non-employees, compensation expense is recognized over the period during which services are rendered until completed. At the end of each financial reporting period prior to completion of the service, the fair value of these awards is remeasured using the then-current fair value of the Company’s ordinary shares and updated assumption inputs in the Black-Scholes option-pricing model or the Monte Carlo simulation model.

The Company classifies share-based compensation expense in the consolidated statement of operations and comprehensive loss in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified.

The Black-Scholes option-pricing model uses key inputs and assumptions including the expected term of the option, share price volatility, risk-free interest rate, dividend yield, share price and exercise price which is equivalent to closing market value on the date of grant. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of share-based compensation expense.

The Monte Carlo simulation model uses key inputs and assumptions including share price volatility, risk-free interest rate, the expected date of satisfaction of vesting conditions and share price. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of share-based compensation expense.

The Company has elected to account for forfeitures as they occur.

Grant Awards

The Company may generate revenue from grant awards that reimburse certain allowable costs for specified projects. For contracts with third parties, when the Company has concluded that it is the principal in conducting the research and development, and where the funding arrangement is considered central to the Company’s ongoing operations, it classifies the recognized funding received as revenue.

Research and Development Credits

Research and development credits are available to the Company under the tax laws in both Ireland and the United States, based on qualifying research and development spend in each jurisdiction as defined under those tax laws. Research and development credits are generally recognized as a reduction of research and development expenses.

Fair Value of Financial Instruments

FASB guidance specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).

The three levels of the fair value hierarchy are as follows:

•Level 1 — Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 1 primarily consists of financial instruments whose value is based on quoted market prices such as exchange-traded instruments and listed equities.

•Level 2 — Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly (e.g. quoted prices of similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in markets that are not active). Level 2 includes financial instruments that are valued using models or other valuation methodologies.

•Level 3 — Unobservable inputs for the asset or liability. Financial instruments are considered Level 3 when their fair values are determined using pricing models, discounted cash flows or similar techniques and at least one significant model assumption or input is unobservable.

The Company’s short-term investments, RLNs and Derivative liability are carried at fair value, determined according to the fair value hierarchy above, see Note 3 for further details. The carrying amounts reported in the consolidated balance sheets for cash and cash equivalents, prepaid expenses and other current assets, accounts payable accrued expenses and other liabilities approximate their fair value based on the short-term maturity of these instruments.

Borrowings

Interest bearing long-term debt is recognized initially at fair value, net of transactions costs incurred. Subsequent to initial recognition, interest bearing long-term debt is measured at amortized cost with any difference between cost and redemption value being recognized as a non-cash component of interest expense in the income statement over the period of the borrowings on an effective interest basis.

Derivative Liability

The Company accounts for derivative instruments in accordance with ASC 815, which establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other financial instruments or contracts which require bifurcation and measurement at fair value for accounting purposes on the balance sheet date. Any liabilities recorded at fair value are revalued each reporting period with the resulting change in fair value reflected in adjustments to fair value of derivatives.

In determining the appropriate fair values, the Company uses the binomial option pricing model, and in the case of the change of control component, in combination with a DCF analysis, which is discussed in Note 3 – Fair Value of Financial Assets and Liabilities. The Company’s derivative financial instruments consist of embedded features in the Exchangeable Notes. The embedded derivatives include provisions that provide the noteholder with certain exchange rights and protections on a fundamental change such as a change of control. The effects of interactions between embedded derivatives are calculated and accounted for in arriving at the overall fair value of the financial instruments.

Royalty-Linked Notes

On recognition, the RLNs qualified as debt instruments under ASC 470, Debt, and were initially recorded at fair value, applying a DCF model, and then subsequently measured at amortized cost. In January 2021, the RLNs were exchange listed, and therefore, derivative accounting has been applied in accordance with ASC 815, Derivatives and Hedging, which establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other financial instruments or contracts which require bifurcation and measurement at fair value for accounting purposes on the balance sheet date. Any liabilities recorded at fair value are revalued at each reporting period with the resulting change in fair value reflected in adjustments to fair value of derivatives.

Ordinary Share Warrants

1.The Company accounts for ordinary share warrants in accordance with applicable accounting guidance provided in ASC 815, Derivatives and Hedging – Contracts in Entity's Own Equity, as either derivative liabilities or as equity instruments depending on the specific terms of the warrant agreement. Any warrants that (i) require physical settlement or net-share settlement or (ii) provide the Company with a choice of net-cash settlement or settlement in its own shares (physical settlement or net-share settlement), provided that such warrants are indexed to the Company's own shares is classified as equity. The Company completed a number of offerings containing freestanding derivatives which satisfy the criteria for

classification as equity instruments as the warrants do not contain cash settlement features or variable settlement provision that cause them to not be indexed to the Company's own stock. The Company assesses classification of its ordinary share warrants at each reporting date to determine whether the instruments still qualify for the scope exception under ASC 815.

Concentration of Credit Risk

Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, cash equivalents and short-term investments. The Company has most of its cash, cash equivalents and short-term investments at three accredited financial institutions in the United States and Ireland, in amounts that exceed federally insured limits. The Company does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships.

Income Taxes

The Company accounts for income taxes under the asset and liability method which requires deferred tax assets and liabilities to be recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, as well as net operating loss carryforwards and research and development tax credits.

Valuation allowances are provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized.

Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that has a greater than 50% likelihood of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest related to unrecognized tax benefits in interest expense and penalties in general and administrative expenses.

Net Loss Per Ordinary Share

Basic and diluted net loss per ordinary share is determined by dividing net loss attributable to ordinary shareholders by the weighted-average ordinary shares outstanding during the period in accordance with ASC 260, Earnings per Share. For the periods presented, the following ordinary shares underlying the options, unvested restricted share units, unvested performance restricted share units, warrants and the Exchangeable Notes have been excluded from the calculation because they would be anti-dilutive.

	Year ended December 31,
	2022		2021		2020
Options to purchase ordinary shares		355,591		1,068,639		63,431
Unvested restricted share units		128,728		119,017		—
Unvested performance restricted share units		—		—		65,527
Warrants		480,186		480,186		1,629,619
Exchangeable Notes		1,287,660		1,217,386		4,715,004
Total		2,252,165		2,885,228		6,473,581

Segment and Other Information

The Company determines and presents operating segments based on the information that is internally provided to the Chief Executive Officer, Chief Financial Officer and Chief Medical Officer, who together are considered the Company’s chief operating decision maker, in accordance with ASC 280, Segment Reporting. The Company has determined that it operates as a single business segment, which is the development and commercialization of innovative treatments for drug resistant bacterial infections.

The distribution of total operating expenses by geographical area was as follows:

	Year ended December 31,
Operating expenses	2022		2021		2020
Ireland	$	22,015	$	15,926	$	23,423
U.S.		8,332		8,554		8,703
Bermuda		36		57		—
Total	$	30,383	$	24,537	$	32,126

The distribution of long-lived assets by geographical area was as follows:

Long lived assets	December 31, 2022		December 31, 2021
Ireland	$	4,052	$	7,601
U.S.		303		578
Total	$	4,355	$	8,179

Retirement Plan

The Company has a defined contribution plan under Section 401(k) of the Internal Revenue Code (the 401(k) Plan). The 401(k) Plan covers all U.S. employees who meet defined minimum age and service requirements, and allows participants to defer a portion of their annual compensation on a pre-tax basis. If the 401(k) Plan is considered top-heavy at the end of the financial year, with key employee accounts accounting for greater than 60% of total 401(k) Plan assets, the Company is required to contribute a deferral rate of up to 3% to the 401(k) Plan on behalf of certain employees. The Company was not required to make a top-heavy contribution for the years ended December 31, 2022, 2021 and 2020.

Inventory

Inventories are valued at the lower of cost or net realizable value. Cost is determined using the first-in, first-out method for all inventories. The Company’s policy is to write down inventory that has become obsolete, inventory that has a cost basis in excess of its expected net realizable value and inventory in excess of expected requirements. The estimate of excess quantities is subjective and primarily dependent on the estimates of future demand for a particular product. If the estimate of future demand changes, the Company considers the impact on the reserve for excess inventory and adjusts the reserve as required. Increases in the reserve are recorded as charges in cost of product sales. For product candidates that have not been approved by the FDA, inventory used in clinical trials is expensed at the time of production and recorded as research and development expenses. For products that have been approved by the FDA, inventory used in clinical trials is expensed at the time the inventory is packaged for the clinical trial. Prior to an advisory committee providing a recommendation to the FDA that the Company’s application should be approved, costs related to manufacturing the product candidates are recorded as research and development expenses. All direct manufacturing costs incurred after this recommendation will be capitalized into inventory. The Company had no inventory as of December 31, 2022 or December 31, 2021.

Contingent Consideration

Certain license agreements contain milestone payments that could result in the requirement to make contingent consideration payments, see Note 15 for further details. Contingent consideration is recorded at the acquisition date estimated fair value of the contingent payment. The fair value of the contingent consideration is measured at each reporting period. Any related unwinding of discount is recognized as a finance expense. Other changes in fair value are recognized in profit or loss or capitalized as an intangible asset depending on the stage of development. As of December 31, 2022, no milestones had been met that required the Company to recognize contingent consideration.

Recently Adopted Accounting Pronouncements

In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity, which reduces the number of accounting models for convertible instruments and allows more contracts to qualify for equity classification. The ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2021. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

In May 2021, the FASB issued ASU 2021-04, Earnings Per Share (Topic 260), Debt—Modifications and Extinguishments (Subtopic 470-50), Compensation—Stock Compensation (Topic 718), and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options, which clarifies an issuer’s accounting for modifications or exchanges of freestanding written call options that remain equity-classified after modification. The ASU 2021-04 is effective for all entities for interim and annual periods in fiscal years beginning after December 15, 2021. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

In July 2021, the FASB issued ASU 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments, which requires a lessor to classify a lease with entirely or partially variable payments that do not depend on an index or rate as an operating lease if a different classification would result in a commencement date selling loss (Day 1 loss). For entities that have adopted ASU 2016-02, Leases, as of July 19, 2021, ASU 2021-05 is effective for annual and interim periods in fiscal years beginning after December 15, 2021 for public business entities and annual periods in fiscal years beginning after December 15, 2021 and interim periods in fiscal years beginning after December 15, 2022 for all other entities. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the FASB or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

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Fair Value of Financial Assets and Liabilities

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities

(3)Fair Value of Financial Assets and Liabilities

The following table presents information about the Company’s financial assets that were carried at fair value on a recurring basis on the consolidated balance sheet as of December 31, 2022 and December 31, 2021 and indicates the fair value hierarchy of the valuation inputs utilized to determine such fair value.

December 31, 2022
Assets	Total		Level 1		Level 2		Level 3
Short-term investments:
Corporate bonds	$	7,781	$	—	$	7,781	$	—
Commercial paper		15,232		—		15,232		—
U.S. Treasury bonds		16,699		—		16,699		—
	$	39,712	$	—	$	39,712	$	—
December 31, 2021
Assets	Total		Level 1		Level 2		Level 3
Short-term investments:
Corporate bonds	$	31,703	$	—	$	31,703	$	—
Commercial paper		5,293		—		5,293		—
U.S. Treasury bonds		16,902		—		16,902		—
	$	53,898	$	—	$	53,898	$	—

See Note 4 for details on the short-term investments. The carrying amounts reported in the consolidated balance sheets for cash and cash equivalents, prepaid expenses and other current assets, accounts payable, accrued expenses and other current liabilities approximate their fair value based on the short-term maturity of these instruments.

The following table presents information about the Company’s debt, Exchangeable Notes, Derivative liability and RLNs and indicates the fair value hierarchy of the valuation inputs utilized to determine the approximate fair value:

December 31, 2022
Liabilities	Book Value		Approximate Fair Value		Level 1		Level 2		Level 3
Exchangeable Notes
Long-term exchangeable notes	$	10,094	$	10,827	$	—	$	10,827	$	—
Derivative liability - exchange option and change of control		196		196		—		—		196
Revenue Futures
Royalty-linked notes		18,372		18,372		—		—		18,372
Total	$	28,662	$	29,395	$	—	$	10,827	$	18,568
December 31, 2021
Liabilities	Book Value		Approximate Fair Value		Level 1		Level 2		Level 3
Debt
Current portion of long-term debt	$	1,627	$	1,627	$	—	$	1,627	$	—
Exchangeable Notes
Long-term exchangeable notes		6,930		9,495		—		9,495		—
Derivative liability - exchange option and change of control		6,058		6,058		—		—		6,058
Revenue Futures
Royalty-linked notes		17,968		17,968		—		—		17,968
Total	$	32,583	$	35,148	$	—	$	11,122	$	24,026

The book value of the current portion of long-term debt approximates its fair value due to the short-term nature of the balance.

The fair value of long-term Exchangeable Notes was determined using DCF analysis using the fixed interest rate outlined in the indenture governing the Exchangeable Notes (Exchangeable Notes Indenture), without consideration of transaction costs, which represents a Level 2 basis of fair value measurement.

The Level 3 liabilities held as of December 31, 2022 consist of the embedded exchange option and change of control premium contained in the Exchangeable Notes (see Note 10 – Debt) and a separate financial instrument, that was issued as part of the Units, the RLNs (see Note 11 – Royalty-Linked Notes). The exchange option and change of control premium met the criteria requiring these to be bifurcated and accounted for separately from the host debt in accordance with ASC 815-15, Derivatives and Hedging; Embedded Derivatives. The exchange option and change of control premium are presented as a Derivative liability upon issuance of the Exchangeable Notes under the Private Placement and Rights Offering and are subsequently remeasured to fair value at the end of each reporting period. At any time on or after January 21, 2021, subject to specified limitations, the Exchangeable Notes are exchangeable for the Company’s ordinary shares, cash or a combination of ordinary shares and cash, at an exchange rate of 87.8139 shares per $1,000 of principal and interest on the Exchangeable Notes (equivalent to an exchange price of approximately $11.3877 per ordinary share) as of December 31, 2022, which was adjusted from an initial exchange rate of 66.666 shares per $1,000 principal and interest on the Exchangeable Notes (equivalent to an initial exchange price of $15.00 per ordinary share) and is subject to further adjustment pursuant to the terms of the Exchangeable Notes Indenture. Beginning on January 21, 2021 to December 31, 2022, certain noteholders of $39,201 aggregate principal amount of Exchangeable Notes have exchanged their notes for an aggregate of 3,592,555 of the Company’s ordinary shares, which included accrued and unpaid interest relating to such notes. The aggregate principal amount of Exchangeable Notes outstanding as of December 31, 2022 was $12,607. The fair value of the exchange option at December 31, 2022 is $49.

In the event of a fundamental change that is not a liquidation event (Fundamental Change), under the Exchangeable Notes Indenture, the Company will be required to pay each holder of an Exchangeable Note the greater of three times the outstanding principal amount of such Exchangeable Note and the consideration that would be received by the holder of such Exchangeable Note, in connection with such Fundamental Change, if the holder had exchanged its note for ordinary shares immediately prior to the consummation of such Fundamental Change, plus any accrued and unpaid interest. The Derivative liability, representing the change of control feature, was recorded at a fair value of $147 at December 31, 2022.

The fair value of each component of the Derivative liability was determined using the binomial option pricing model, and in the case of the change of control component, in combination with a DCF analysis, without consideration of transaction costs, which represents a Level 3 basis of fair value measurement. The key inputs to valuing the Derivative liability as of December 31, 2022 include the terms of the Exchangeable Notes Indenture, the Company’s share price and market capitalization, the expected annual

volatility of the Company’s ordinary shares, management’s assumption regarding the probability of a Fundamental Change pursuant to the terms of the Exchangeable Notes Indenture, and the risk-free interest rate. Fair value measurements are highly sensitive to changes in these inputs and significant changes in these inputs could result in a significantly higher or lower fair value.

The following table presents the changes in fair value of the Company's Derivative liability:

	Year Ended December 31, 2022			Year Ended December 31, 2021
Balance at January 1	$	6,058		$	28,865
Conversion of Exchangeable Notes		—			(80,512	)
Adjustment to fair value		(5,862	)		57,705
Balance at December 31	$	196		$	6,058

The following summary table shows the assumptions used in the binomial option pricing model to estimate the fair value of the exchange option:

	December 31, 2022	December 31, 2021
Share price	$0.84	$5.88
Market capitalization	$10,582,858	$71,647,911
Volatility	100%	130%
Risk-free interest rate	4.46%	1.00%
Dividend rate	0%	0%

The additional significant assumption used in the DCF model to estimate the fair value of the change of control feature at December 31, 2022 was management’s assumption regarding the probability of a Fundamental Change pursuant to the terms of the Exchangeable Notes Indenture.

The RLN liability is carried at fair value on the consolidated balance sheet (see Note 11 – Royalty-Linked Notes). The total fair value of $18,372 was determined using DCF analysis, without consideration of transaction costs, which represents a Level 3 basis of fair value measurement. The key inputs to valuing the RLNs were the terms of the indenture governing the RLNs (RLN Indenture), the expected cash flows to be received by holders of the RLNs based on management’s revenue forecasts of U.S. sulopenem sales and a risk-adjusted discount rate to derive the net present value of expected cash flows. The RLNs will be subject to a maximum return amount, including all principal and payments and certain default interest in respect of uncurable defaults, of $160.00 (or 4,000 times the principal amount of such note). The discount rate applied to the model was 22% and 20% for the years ended December 31, 2022 and 2021, respectively. Fair value measurements are highly sensitive to changes in these inputs and significant changes in these inputs could result in a significantly higher or lower fair value.

There have been no transfers of assets or liabilities between the fair value measurement levels.

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Short-term Investments

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Short-term Investments

(4)Short-term Investments

The Company classifies its short-term investments as available-for-sale. Short-term investments comprise highly liquid investments with minimum “A-” rated securities and as at year end consist of corporate bonds, commercial paper and U.S. Treasury bonds with maturities of more than three months at the date of purchase. Short-term investments as of December 31, 2022 have a weighted average maturity of 0.36 years. The investments are reported at fair value with unrealized gains or losses recorded in the consolidated statements of operations and comprehensive loss. Any differences between the amortized cost and fair value of investments are represented by unrealized gains or losses. The fair value of U.S. Treasury bonds, corporate bonds and commercial paper are represented by Level 2 fair value measurements - quoted price for a similar asset, or other observable inputs such as interest rates or yield curves.

The following table represents the Company’s available-for-sale short-term investments by major security type as of December 31, 2022:

December 31, 2022					Maturity by period
	Amortized	Unrealized	Unrealized	Fair Value	Less than 1
Available-for-sale	Cost	Gains	(Losses)	Total	Year	1 to 5 Years
Corporate bonds	$7,836	$—	$(55)	$7,781	$7,781	$—
Commercial paper	15,230	2	—	15,232	15,232	—
U.S. Treasury bonds	16,996	—	(297)	16,699	16,699	—
Total	$40,062	$2	$(352)	$39,712	$39,712	$—

The following table represents the Company’s available for sale short-term investments by major security type as of December 31, 2021:

December 31, 2021					Maturity by period
	Amortized	Unrealized	Unrealized	Fair Value	Less than 1
Available-for-sale	Cost	Gains	(Losses)	Total	Year	1 to 5 Years
Corporate bonds	$31,723	$1	$(21)	$31,703	$30,677	$1,026
Commercial paper	5,293	—	—	5,293	5,293	—
U.S. Treasury bonds	16,989	—	(87)	16,902	—	16,902
Total	$54,005	$1	$(108)	$53,898	$35,970	$17,928

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Prepaid Expenses and Other Current Assets

12 Months Ended

Dec. 31, 2022

Prepaid Expense and Other Assets, Current [Abstract]

Prepaid Expenses and Other Current Assets

(5)Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

	December 31, 2022		December 31, 2021
Prepaid research and development expenses	$	458	$	—
Research and development tax credit receivable		118		840
Prepaid insurance		592		624
Interest receivable		55		290
Value added tax receivable		38		75
Other prepaid assets		42		56
Short-term deposits		35		37
Total	$	1,338	$	1,922

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Intangible Asset, Net

12 Months Ended

Dec. 31, 2022

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible Asset, Net

(6)Intangible Asset, net

Intangible asset and related accumulated amortization are as follows:

	December 31, 2022	December 31, 2021
Gross intangible asset	$5,148	$5,148
Less: accumulated amortization	(3,429)	(1,713)
	$1,719	$3,435

On December 10, 2021, the Company entered into an amendment to an agreement with a supplier whereby advance payments made from June 2016 to January 2020 are being set against a reservation fee for a tableting facility for the period from January 1, 2021 to December 31, 2023. This reservation right is being amortized over the three year term of the amended agreement.

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Property and Equipment, Net

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

(7)Property and Equipment, net

Property and equipment and related accumulated depreciation are as follows:

	December 31, 2022			December 31, 2021
Leasehold improvements	$	148		$	148
Furniture and fixtures		120			120
Laboratory equipment		—			86
Computer equipment		85			23
		353			377
Less: accumulated depreciation		(284	)		(286	)
	$	69		$	91

Depreciation expense was $84, $391 and $161 for the years ended December 31, 2022, 2021 and 2020, respectively.

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Leases

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Leases

(8)Leases

The Company has entered into a number of operating leases, primarily for office space and commercial property. These leases have remaining terms which range from .83 years to 5.49 years. The renewal option on one lease was exercised in February 2022 for an additional period of three years, extending this lease term to June 2025. The renewal option on another lease was derecognized in

June 2022 as it is no longer reasonably certain that the option will be exercised, resulting in a reduction in the remaining term from 16 to six years. In September 2020, the Company entered into a sublease agreement for a commercial unit that extends through September 2023. In November 2021, the Company entered into a 12-month lease, with a rolling extension, for office space, and in May 2022, the Company entered into a 6-month lease for office space, which was extended to November 2023 and has elected not to apply the measurement and recognition requirements of ASC 842 to these short-term leases as any renewal term exercised or considered reasonably certain of exercise by the Company does not extend more than 12 months from the end of the previously determined lease term. Certain leases contain variable lease payments, including payments based on an index or rate. Variable lease payments based on an index or rate are initially measured using the index or rate in effect at lease commencement. Certain agreements contain both lease and non-lease components. The Company has elected to separately account for these components in determining the lease liabilities and right-of-use assets. The Company’s lease agreements generally do not provide an implicit borrowing rate; therefore, an internal incremental borrowing rate was determined based on information available at lease commencement date for the purposes of determining the present value of lease payments. The Company used the incremental borrowing rate on January 1, 2019 for all leases that commenced prior to that date. All operating lease expenses are recognized on a straight-line basis over the lease term. The Company recognized $753, $1,009 and $991 of operating lease costs for right-of-use assets during the years ended December 31, 2022, 2021 and 2020, respectively. The Company recognized $243 of rental expenses on short-term leases during the year ended December 31, 2022. The Company recognized $293, $335 and $118 of sublease income during the years ended December 31, 2022, 2021 and 2020, respectively.

Information related to the Company’s right-of-use assets and related lease liabilities is as follows:

	December 31, 2022		December 31, 2021
Cash paid for operating lease liabilities	$	709	$	944

	December 31, 2022			December 31, 2021
Weighted-average remaining lease term	5.04 years			13.97 years
Weighted-average discount rate		5.5	%		7.0	%

Right-of-use assets and lease liabilities for the Company’s operating leases were recorded in the consolidated balance sheet as follows, representing the Company’s right to use the underlying asset for the lease term (“Other assets”) and the Company’s obligation to make lease payments (“Other current liabilities” and “Other liabilities”):
 

	December 31, 2022	December 31, 2021
Other assets	$1,770	$3,741
Other current liabilities	$332	$464
Other liabilities	1,304	3,436
Total lease liabilities	$1,636	$3,900

Future lease payments included in the measurement of lease liabilities on the consolidated balance sheet as of December 31, 2022 for the following five fiscal years and thereafter were as follows:

Due in 12 month period ended December 31,
2023	$407
2024	412
2025	344
2026	295
2027	295
Thereafter	74
	$1,827
Less imputed interest	(191)
Total lease liabilities	$1,636

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Accrued Expenses

12 Months Ended

Dec. 31, 2022

Payables and Accruals [Abstract]

Accrued Expenses

(9)Accrued Expenses

Accrued expenses consist of the following:

	December 31, 2022		December 31, 2021
Accrued payroll and bonus expenses	$	1,971	$	771
Accrued clinical trial costs		1,549		45
Accrued professional fees		606		16
Accrued other expenses		206		256
Accrued manufacturing expenses		14		77
Total	$	4,346	$	1,165

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Debt

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Debt

(10)Debt

Secured Credit Facility

On April 27, 2018, the Company’s subsidiaries, Iterum Therapeutics International Limited, Iterum Therapeutics US Holding Limited and Iterum Therapeutics US Limited (the Borrowers), entered into a loan and security agreement (the Loan and Security Agreement) with SVB pursuant to which SVB agreed to lend the Borrowers up to $30,000 in two term loans. $15,000 of the secured credit facility was funded on closing. A second draw of up to $15,000 was available to the Company through October 31, 2019, upon satisfaction of either of the following: (i) the achievement by the Company of both non-inferiority and superiority primary endpoints from its Phase 3 uncomplicated urinary tract infection (uUTI) trial, as well as reporting satisfactory safety data from the trial, or (ii) the achievement of non-inferiority primary endpoints from both its Phase 3 uUTI and complicated urinary tract infection (cUTI) trials, as well as reporting satisfactory safety data from the trials. The Company did not satisfy the conditions for the second draw before the deadline of October 31, 2019.

Required monthly amortization payments for the initial $15,000 draw commenced on November 1, 2019 and total principal repayments of $1,552 were made during the year ended December 31, 2022. Interest accrued at a floating per annum rate equal to the greater of (i) 8.31%; or (ii) 3.89% above the Wall Street Journal prime rate, and was payable monthly in arrears. All outstanding principal, plus a 4.20% final interest payment, were due and paid on March 1, 2022 (the maturity date), effectively terminating the Loan and Security Agreement. The final payment fee of $630, which represented 4.2% of the funded loan, was accreted using the effective interest method over the life of the loan as interest expense.

In connection with the initial $15,000 draw, the Company issued SVB and Life Sciences Fund II LLC (LSF) warrants to purchase an aggregate of 19,890 Series B convertible preferred shares (which converted into warrants to purchase 1,326 ordinary shares upon the Company’s initial public offering (IPO)) at an exercise price of $282.75 per share. These warrants will expire on April 27, 2028.

The loan proceeds were allocated based on the relative fair values of the debt instrument and the warrant instrument. The fair value of the warrants and the closing costs were recorded as debt discounts and are being amortized using the effective interest rate method over the term of the loan. The effective annual interest rate of the outstanding debt was approximately 12.51% on March 1, 2022. The Company recognized $16, $556 and $1,355 of interest expense related to the Loan and Security Agreement during the years ended December 31, 2022, 2021 and 2020, respectively, including $6, $142 and $404 related to the accretion of the debt discounts and deferred financing costs during the years ended December 31, 2022, 2021 and 2020, respectively. All outstanding amounts were repaid on March 1, 2022, effectively terminating the Loan and Security Agreement.

In connection with the Private Placement, Iterum Bermuda was joined as a party to the Loan and Security Agreement as a borrower and the Loan and Security Agreement was amended on January 16, 2020 to, among other things, modify the definition of subordinated debt to include the RLNs and Exchangeable Notes.

2025 Exchangeable Notes

On January 21, 2020, the Company completed a Private Placement pursuant to which its wholly owned subsidiary, Iterum Bermuda issued and sold $51,588 aggregate principal amount of Exchangeable Notes and $103 aggregate principal amount of RLNs, to a group of accredited investors. On September 8, 2020, the Company completed a Rights Offering pursuant to which Iterum Bermuda issued and sold $220 aggregate principal amount of Exchangeable Notes and $0.5 aggregate principal amount of RLNs, to existing shareholders. The Securities were sold in Units with each Unit consisting of an Exchangeable Note in the original principal amount of $1,000 and 50 RLNs. The Units were sold at a price of $1,000 per Unit.

At any time on or after January 21, 2021, subject to specified limitations, the Exchangeable Notes are exchangeable for the Company’s ordinary shares, cash or a combination of ordinary shares and cash, at the Company’s election, at an exchange rate of 87.8139 shares per $1,000 principal and interest on the Exchangeable Notes (equivalent to an exchange price of approximately $11.3877 per ordinary share) as of December 31, 2022, which exchange rate was adjusted from an initial exchange rate of 66.666 shares per $1,000 principal and interest on the Exchangeable Notes (equivalent to an initial exchange price of $15.00 per ordinary share) and is subject to further adjustment pursuant to the terms of the Exchangeable Notes Indenture. Any accrued and unpaid interest being exchanged will be calculated to include all interest accrued on the Exchangeable Notes being exchanged to, but excluding, the exchange settlement date. Beginning on January 21, 2021 to December 31, 2022, certain noteholders of $39,201 aggregate principal amount of Exchangeable Notes have completed a non-cash exchange of their notes for an aggregate of 3,592,555 of the Company’s ordinary shares, which included accrued and unpaid interest relating to such notes. The aggregate principal amount of Exchangeable Notes outstanding as of December 31, 2022 was $12,607.

In addition, the Exchangeable Notes will become due and payable by the Company upon the occurrence of a Fundamental Change as defined in the Exchangeable Notes Indenture. The Company will be required to pay each holder of the Exchangeable Notes the greater of three times the outstanding principal amount of such Exchangeable Note and the consideration that would be received by the holder of such Exchangeable Note in connection with such Fundamental Change if the holder had exchanged its note for ordinary shares immediately prior to the consummation of such Fundamental Change, plus any accrued and unpaid interest.

The Company evaluates its debt and equity issuances to determine if those contracts, or embedded components of those contracts, qualify as derivatives under ASC 815-15, Derivatives and Hedging, requiring separate recognition in the Company’s financial statements. The Company evaluated the accounting for the issuance of the Exchangeable Notes and concluded that the embedded exchange option and change of control feature are considered a Derivative liability under ASC 815-15 requiring bifurcation, from the Exchangeable Notes, as it does not qualify for the scope exceptions for contracts in an entity’s own equity given the terms of the Exchangeable Notes. The exchange option and change of control feature are accounted for as a Derivative liability, under ASC 815-15, and are required to be separated and recorded as a single liability, which is revalued each reporting period with the resulting change in fair value reflected in other income, net, in the consolidated statements of operations and comprehensive loss.

The fair value of the Derivative liability related to the Private Placement on January 21, 2020 was $27,038, and the fair value of the Derivative liability related to the Rights Offering on September 8, 2020 was $82, both of which were recorded as a reduction to the book value of the host debt contract. This debt discount is being amortized to interest expense over the term of the debt using the effective interest method. Transaction costs amounting to $2,848 were allocated to the exchange option. These costs are reflected in financing transaction costs in the consolidated statements of operations and comprehensive loss for the year ended December 31, 2020. Transaction costs amounting to $2,814 were allocated to the debt host and capitalized in the host debt book value.

In circumstances where the embedded exchange option in a convertible instrument is required to be bifurcated, and there are other embedded derivative instruments in the convertible instrument that are required to be bifurcated, the derivative instruments are accounted for as a single, compound derivative instrument. The classification of derivative instruments, including whether such instruments should be recorded as liabilities or as equity, is reassessed at the end of each reporting period. Derivative instrument liabilities are classified in the balance sheet as current or non-current based on whether or not settlement of the derivative instrument is expected within twelve months of the balance sheet date.

The Company determined that all other features of the Exchangeable Notes were clearly and closely associated with a debt host and did not require bifurcation as a Derivative liability. The initial value of the Exchangeable Notes on inception, net of transaction costs was $9,891.

The Company recognized $820, $1,078 and $3,180 of interest expense related to the Exchangeable Notes during the years ended December 31, 2022, 2021 and 2020, respectively, and $2,344 , $2,893 and $7,764 related to the amortization of the debt discounts and deferred financing costs during the years ended December 31, 2022, 2021 and 2020, respectively. These amounts are recorded in interest expense, net in the consolidated statements of operations and comprehensive loss for the years ended December 31, 2022, 2021 and 2020, respectively. The balance of the Exchangeable Notes at each reporting date is as follows:

	December 31, 2022
	Principal	Accrued Interest
January 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	$51,588	$5,058
September 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	220	20
Conversion of $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	(39,201)	(2,697)
2025 Exchangeable Notes	12,607	2,381
Unamortized discount and debt issuance costs	(4,894)	—
2025 Exchangeable Notes, net	$7,713	$2,381

	December 31, 2021
	Principal	Accrued Interest
January 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	$51,588	$4,246
September 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	220	12
Conversion of $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	(39,201)	(2,697)
2025 Exchangeable Notes	12,607	1,561
Unamortized discount and debt issuance costs	(7,238)	—
2025 Exchangeable Notes, net	$5,369	$1,561

Payment Protection Program

On April 3, 2020, the U.S. Small Business Administration (SBA) launched the Paycheck Protection Program, which was established following the signing of the CARES Act on March 27, 2020. On April 30, 2020, our wholly owned subsidiary, Iterum Therapeutics US Limited (Iterum US Limited), entered into the PPP loan with SVB under the Paycheck Protection Program, pursuant to the Company receiving a PPP loan of $744 with a fixed 1% annual interest rate and a maturity of two years. Under the terms of the agreement, there were no payments due by the Company until the SBA remitted the forgiveness amount to Iterum US Limited or until after the 10 months after the end of the six-month period beginning April 30, 2020 (the Deferral Period). Following the Deferral Period, equal monthly repayments of principal and interest were due to fully amortize the principal amount outstanding on the PPP loan by the maturity date. The SBA forgave $340 of the loan in November 2020, and the remaining loan of $404 began amortization in December 2020. Total principal repayments of $69, $309 and $26 were made during the years ended December 31, 2022, 2021 and 2020, respectively. The Company recognized $0, $2 and $1 of interest expense related to the loan agreement during the years ended December 31, 2022, 2021 and 2020, respectively.

Scheduled principal payments on outstanding debt, including principal amounts owed to RLN holders (see Note 11 – Royalty-Linked Notes) as of December 31, 2022, for the following five fiscal years and thereafter were as follows:

Year Ending December 31,
2023	$—
2024	—
2025	12,607
2026	—
2027	—
Thereafter	104
	$12,711

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Royalty-Linked Notes

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Royalty-Linked Notes

(11)Royalty-Linked Notes

Liability Related to Sale of Future Royalties

On January 21, 2020, as part of the Private Placement, the Company issued 2,579,400 RLNs to a group of accredited investors. On September 8, 2020, as part of the Rights Offering, the Company issued 11,000 RLNs to existing shareholders. The RLNs will entitle the holders thereof to payments, at the applicable payment rate, based solely on a percentage of the Company’s net revenues from U.S. sales of specified sulopenem products earned through December 31, 2045, but will not entitle the holders thereof to any payments unless the Company receives FDA approval for one or more specified sulopenem products prior to December 31, 2025 and the Company earns net revenues on such product. If any portion of the principal amount of the outstanding RLNs, equal to $0.04 per RLN, has not been paid as of the end date on December 31, 2045 (or December 31, 2025, in the event that the Company has not yet received FDA approval with respect to one or more specified sulopenem products by such date), Iterum Bermuda must pay the unpaid portion of the principal amount. The RLNs will earn default interest if the Company breaches certain obligations under the RLN Indenture (but do not otherwise bear interest) and will be subject to a maximum return amount, including all principal and payments and certain default interest in respect of uncurable defaults, of $160.00 (or 4,000 times the principal amount of such note). The RLNs are redeemable at any time, at the Company’s option, subject to the terms of the RLN Indenture.

In accordance with exceptions allowed under ASC 815-10, Derivatives and Hedging, this transaction was initially accounted for as a debt liability under ASC 470, Debt. Subsequent to the listing of the RLNs on the Bermuda Stock Exchange in January 2021, the RLNs are accounted for as a derivative and are remeasured to fair value at each reporting date. The Company has no obligation to pay any amount to the noteholders until the net revenue of the specified products are earned. In order to record the amortization of the liability, the Company was required to estimate the total amount of future net revenue to be earned in each period under the RLN Indenture and the payments that will be passed through to the noteholders over the life of the RLN Indenture.

The note proceeds from both the Private Placement and subsequent Rights Offering were allocated based on the relative fair value of the debt instrument, less transaction costs amounting to $1,239, as debt discounts. The Company imputed interest on the amortized cost of the liability using an estimated effective interest rate of 31.7% up to the date of the change in measurement. Payments to the noteholders in each period, related to future sales of sulopenem, would offset the liability. Subsequent to recognition of the RLN in accordance with ASC 815, Derivatives and Hedging, in January 2021, the fair value of the RLN is determined using DCF analysis, without consideration of transaction costs, which represents a Level 3 basis of fair value measurement. The Company periodically assesses the revenue forecasts of the specified sulopenem products and the related payments.

Subsequent to the listing of the RLNs on the Bermuda Stock Exchange in January 2021, the Company recognized the remaining unaccreted interest balance of $1,024 related to debt discounts and deferred financing costs under ASC 470, Debt, in the consolidated statement of operations and comprehensive loss for the year ended December 31, 2021. The balance of the RLNs at each reporting date is as follows:

	December 31, 2022
Total liability related to the sale of future royalties, on inception	$10,990
Liability related to the sale of future royalties, arising from the Rights Offering	51
Amortization of discount and debt issuance costs	3,666
Adjustments to fair value	3,665
Total liability related to the sale of future royalties at December 31, 2021	$18,372
Current Portion	—
Long-term Portion	$18,372

	December 31, 2021
Total liability related to the sale of future royalties, on inception	$10,990
Liability related to the sale of future royalties, arising from the Rights Offering	51
Amortization of discount and debt issuance costs	3,666
Adjustments to fair value	3,261
Total liability related to the sale of future royalties at December 31, 2020	$17,968
Current Portion	—
Long-term Portion	$17,968

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Shareholders' Equity / (Deficit)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Disclosure - Shareholders' Equity / (Deficit)

(12)Shareholders’ Equity / (Deficit)

The Company’s capital structure consists of ordinary shares and undesignated preferred shares. Under Irish law, the Company is prohibited from allotting shares without consideration. Accordingly, at least the nominal value of the shares issued underlying any

warrant, pre-funded warrant, restricted share award, restricted share unit, performance share award, bonus share or any other share based grant must be paid pursuant to the Irish Companies Act 2014 (Irish Companies Act).

Ordinary Shares

At the Company’s extraordinary general meeting of shareholders on January 28, 2021, the Company’s shareholders approved an increase of 10,000,000 ordinary shares of $0.01 par value each to the number of authorized ordinary shares and the Company’s Articles of Association were amended accordingly. The Company has authorized ordinary shares of 20,000,000 ordinary shares of $0.01 par value each as of December 31, 2022. The holders of ordinary shares are entitled to one vote for each share held. The holders of ordinary shares currently have no preemptive or other subscription rights, and there are no redemption or sinking fund provisions with respect to such shares.

The Company filed a universal shelf registration statement on Form S-3 with the SEC, which was declared effective on October 17, 2022 (File No. 333-267795), and pursuant to which the Company registered for sale up to $100.0 million of any combination of debt securities, ordinary shares, preferred shares, subscription rights, purchase contracts, units and/or warrants from time to time and at prices and on terms that the Company may determine.

On October 7, 2022, the Company entered into a sales agreement with HC Wainwright, as agent, pursuant to which the Company may offer and sell ordinary shares, nominal value $0.01 per share, for aggregate gross sales proceeds of up to $16.0 million (subject to the availability of ordinary shares), from time to time through HC Wainwright by any method permitted that is deemed to be an "at the market offering" as defined in Rule 415 (a)(4) promulgated under the Securities Act of 1933, as amended. During the year ended December 31, 2022, the Company sold 356,933 ordinary shares under the “at-the-market” agreement at an average price of $1.25 per share for net proceeds of $0.4 million.

On February 3, 2021, the Company entered into an underwriting agreement (the Underwriting Agreement) pursuant to which it issued and sold 2,318,840 ordinary shares, $0.01 nominal value per share, at a public offering price per share of $17.25 (the February 2021 Underwritten Offering). The February 2021 Underwritten Offering closed on February 8, 2021. Pursuant to the Underwriting Agreement, the Company granted the underwriter an option for a period of 30 days to purchase up to an additional 347,826 ordinary shares on the same terms and conditions, which the underwriter exercised in full on February 10, 2021. This exercise increased the total number of ordinary shares sold by the Company in the offering to 2,666,666 shares, which resulted in aggregate gross proceeds of $46,000 and net proceeds of $42,119 after deducting underwriting discounts and commissions and other offering expenses.

On February 9, 2021, the Company completed a registered direct offering (the February 2021 Registered Direct Offering), pursuant to which the Company issued and sold an aggregate of 1,166,666 ordinary shares, $0.01 nominal value per share, at a purchase price per share of $30.00, for aggregate gross proceeds of $35,000 and net proceeds of $32,235 after deducting placement agent fees and other offering expenses. The closing date of the February 2021 Registered Direct Offering was February 12, 2021. The Company offered the ordinary shares in the June 3, 2020 Offering, June 30, 2020 Offering, February 2021 Underwritten Offering and February 2021 Registered Direct Offering pursuant to its universal shelf registration statement on Form S-3, which was declared effective on July 16, 2019 (File No. 333-232569).

Beginning on January 21, 2021 to December 31, 2022, certain noteholders of $39,201 aggregate principal amount of Exchangeable Notes have exchanged their notes for an aggregate of 3,592,555 of the Company’s ordinary shares, which included accrued and unpaid interest relating to such notes. The aggregate principal amount of Exchangeable Notes outstanding as of December 31, 2022 was $12,607.

Warrants to purchase Ordinary Shares

In connection with the initial drawdown under the Loan and Security Agreement, the Company issued SVB and LSF warrants to purchase an aggregate of 19,890 Series B convertible preferred shares (which converted into warrants to purchase 1,326 ordinary shares upon the Company’s IPO) at an exercise price of $282.75 per share. These warrants will expire on April 27, 2028. No warrants had been exercised as of December 31, 2022.

In connection with the June 3, 2020 Offering completed on June 5, 2020, pursuant to the June 3, 2020 SPA, in a concurrent private placement, the Company issued and sold to institutional investors warrants to purchase up to 99,057 ordinary shares. Upon closing, the warrants became exercisable immediately at an exercise price of $24.30 per ordinary share, subject to adjustment in certain circumstances, and will expire on December 5, 2025. Warrants to purchase 13,868 ordinary shares, amounting to 7% of the ordinary shares issued under the June 3, 2020 SPA, were issued to designees of the placement agent on the closing of the June 3, 2020 Offering. Upon closing, the warrants issued to such designees were exercisable immediately at an exercise price of $31.5465 per ordinary share and will expire on June 3, 2025. No warrants had been exercised as of December 31, 2022.

In connection with the June 30, 2020 Offering completed on July 2, 2020, pursuant to the June 30, 2020 SPA, in a concurrent private placement, the Company has also issued and sold to institutional investors warrants to purchase up to 112,422 ordinary shares. Upon closing, the warrants became exercisable immediately at an exercise price of $21.30 per ordinary share, subject to adjustment in

certain circumstances, and will expire on January 2, 2026. Warrants to purchase 15,739 ordinary shares, amounting to 7% of the ordinary shares issued under the June 30, 2020 SPA, were issued to designees of the placement agent on closing of the June 30, 2020 Offering. Upon closing, the warrants issued to such designees were exercisable immediately at an exercise price of $27.7965 per ordinary share and will expire on June 30, 2025. As of December 31, 2022, warrants issued in connection with the June 30, 2020 Offering had been exercised for 84,317 ordinary shares, for net proceeds of $1,796.

In connection with the October 2020 Offering, the Company issued and sold warrants to purchase up to 1,346,153 ordinary shares. Upon closing, the warrants became exercisable immediately at an exercise price of $9.75 per ordinary share, subject to adjustment in certain circumstances, and will expire on October 27, 2025. Warrants to purchase 125,641 ordinary shares, which represents a number of ordinary shares equal to 7.0% of the aggregate number of ordinary shares and pre-funded warrants sold in the October 2020 Offering, were issued to designees of the placement agent on closing of the October 2020 Offering. Upon closing, the warrants issued to such designees became exercisable immediately at an exercise price of $12.1875 per ordinary share and expire on October 22, 2025. As of December 31, 2022, warrants issued in connection with the October 2020 Offering had been exercised for 1,392,701 ordinary shares, for net proceeds of $13,885.

In connection with the February 2021 Underwritten Offering, the Company issued to the underwriter’s designees warrants to purchase 162,318 ordinary shares, amounting to 7.0% of the aggregate number of ordinary shares sold in the February 2021 Underwritten Offering which closed on February 8, 2021. The warrants issued to such designees have an exercise price of $21.5625 per ordinary share, were exercisable upon issuance and will expire on February 3, 2026. As of December 31, 2022, warrants issued in connection with the February 2021 Underwritten Offering had been exercised for 25,333 ordinary shares, for net proceeds of $546.

In connection with the February 2021 Underwritten Offering, the Company granted the underwriter an option for a period of 30 days to purchase an additional 347,826 ordinary shares. Upon the underwriter’s exercise of its option, on February 10, 2021, the Company issued warrants to purchase an additional 24,347 ordinary shares to the underwriter’s designees, amounting to 7.0% of the aggregate number of additional ordinary shares sold pursuant to the underwriter’s option. The warrants issued to such designees have an exercise price of $21.5625 per ordinary share, were exercisable upon issuance and will expire on February 3, 2026. No warrants had been exercised as of December 31, 2022.

In connection with the February 2021 Registered Direct Offering which closed on February 12, 2021, warrants to purchase 81,666 ordinary shares, amounting to 7.0% of the aggregate number of ordinary shares issued under the securities purchase agreement, were issued to designees of the placement agent upon closing. The warrants issued to such designees were exercisable upon issuance at an exercise price of $37.50 per ordinary share and will expire on February 9, 2026. No warrants had been exercised as of December 31, 2022.

Undesignated Preferred Shares

The Company has authorized 100,000,000 undesignated preferred shares of $0.01 par value each as of December 31, 2022. The Company's Board of Directors is authorized by the Company’s Articles of Association to determine the rights attaching to the undesignated preferred shares including rights of redemption, rights as to dividends, rights on winding up and conversion rights. There were no undesignated preferred shares in issue as of December 31, 2022 or December 31, 2021.

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Share-Based Compensation

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Share-Based Compensation

(13)Share-Based Compensation

On November 18, 2015, the Company’s Board of Directors adopted and approved the 2015 Equity Incentive Plan (the 2015 Plan), which authorized the Company to grant up to 14,895 ordinary shares in the form of incentive share options, nonstatutory share options, share appreciation rights, restricted share awards, restricted share units and other share awards. The types of share-based awards, including the rights amount, terms, and exercisability provisions of grants are determined by the Company’s Board of Directors. The purpose of the 2015 Plan was to provide the Company with the flexibility to issue share-based awards as part of an overall compensation package to attract and retain qualified personnel. On May 18, 2017, the Company amended the 2015 Plan to increase the number of ordinary shares available for issuance under the 2015 Plan by 14,640 shares to 29,535 shares.

On March 14, 2018, the Company’s Board of Directors adopted and approved the 2018 Equity Incentive Plan (the 2018 Plan), which became effective upon the execution and delivery of the underwriting agreement related to the Company’s IPO in May 2018. Since adopting the 2018 Plan, no further grants will be made under the 2015 Plan. The ordinary shares underlying any options that are forfeited, canceled, repurchased or are otherwise terminated by the Company under the 2015 Plan will not be added back to the ordinary shares available for issuance.

The 2018 Plan originally authorized the Company to grant up to 67,897 ordinary shares in the form of incentive share options, nonstatutory share options, share appreciation rights, restricted share awards, restricted share units, performance share awards,

performance cash awards and other share awards. The types of share-based awards, including the amount, terms, and exercisability provisions of grants are determined by the Company’s Board of Directors. The ordinary shares underlying any options that are forfeited, canceled, repurchased or are otherwise terminated by the Company under the 2018 Plan are added back to the ordinary shares available for issuance under the 2018 Plan.

On December 5, 2018, pursuant to powers delegated to it by the Board of Directors of the Company, the Compensation Committee approved an increase in the number of ordinary shares available to be granted pursuant to the 2018 Plan by 4% of the total number of shares of the Company’s issued share capital on December 31, 2018, being 38,272 ordinary shares.

On February 14, 2020, pursuant to powers delegated to it by the Board of Directors of the Company, the Compensation Committee approved, by written resolution, an increase of 39,650 ordinary shares to the number of ordinary shares available to be granted pursuant to the 2018 Plan, being just under 4% of the total number of the Company’s ordinary shares outstanding on December 31, 2019, in accordance with the terms of the 2018 Plan.

On June 10, 2020, at the Company’s annual general meeting of shareholders, the shareholders approved and adopted an amended and restated 2018 Plan which, among other things included an increase of 150,000 ordinary shares to the number of ordinary shares reserved for issuance under the 2018 Plan.

On June 23, 2021, at the Company’s annual general meeting of shareholders, the shareholders approved an amendment to the amended and restated 2018 Plan to increase the number of ordinary shares reserved for issuance under the amended and restated 2018 Plan by 1,000,000 ordinary shares to 1,295,819 ordinary shares.

On November 24, 2021, the Company’s Board of Directors adopted and approved the 2021 Inducement Equity Incentive Plan (the 2021 Inducement Plan) reserving 333,333 of its ordinary shares to be used exclusively for grants of awards to individuals that were not previously employees or directors of the Company (or following such individuals’ bona fide period of non-employment with the company), as a material inducement to such individuals’ entry into employment with the company within the meaning of Rule 5635(c)(4) of the Nasdaq Listing Rules. The terms and conditions of the 2021 Inducement Plan are substantially similar to the 2018 Plan.

Share Options

Unless specified otherwise in an individual option agreement, share options granted under the 2015 Plan, the 2018 Plan and the 2021 Inducement Plan generally have a ten year term and a four year vesting period for employees and a one year vesting period for directors. The vesting requirement is conditioned upon a grantee’s continued service with the Company during the vesting period. Once vested, all awards are exercisable from the date of grant until they expire. The option grants are non-transferable. Vested options generally remain exercisable for 90 days subsequent to the termination of the option holder’s service with the Company. In the event of an option holder’s disability or death while employed by or providing service to the Company, the exercisable period extends to twelve months or eighteen months, respectively.

The fair value of options granted are estimated using the Black-Scholes option-pricing model. The inputs for the Black-Scholes model require significant management assumptions. The risk-free interest rate is based on a normalized estimate of the 7-year U.S. treasury yield. The Company has estimated the expected term utilizing the “simplified” method for awards that qualify as “plain vanilla”. The Company does not have sufficient company-specific historical and implied volatility information and it therefore estimates its expected share volatility based on historical volatility information of reasonably comparable guideline public companies and itself. The Company expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded share price. Expected dividend yield is based on the fact that the Company has never paid cash dividends and the Company’s future ability to pay cash dividends on its shares may be limited by the terms of any future debt or preferred securities. The Company has elected to account for forfeitures as they occur.

The Company granted 197,085, 1,028,090 and 4,322 share options to employees and directors during the years ended December 31, 2022, 2021 and 2020, respectively. There were 296,199, 1,033,820 and 17,778 unvested employee and director options outstanding as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively. Total expense recognized related to the employee and director share options was $3,580, $3,779, and $1,136, for the years ended December 31, 2022, 2021 and 2020, respectively. Total unamortized compensation expense related to employee and director share options was $929, $21,521 and $970 as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively, expected to be recognized over a remaining weighted average vesting period of 1.41 years, 3.49 years and 1.47 years as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively.

On July 7, 2022, certain of the Company's executive officers and employees agreed to the surrender and cancellation of certain previously granted share options for an aggregate of 906,800 ordinary shares in order to make additional shares available under the

2018 Plan. Total expense recognized in connection with the cancellation of these employee share options was $17,350 for the year ended December 31, 2022, and was recorded in other income and expense as Cancellation of Share Options.

The range of assumptions that the Company used to determine the grant date fair value of employee and director options granted were as follows:

	Year Ended December 31,
	2022	2021	2020
Volatility	100 - 130%	120 - 140%	90.3 - 99.5%
Expected term in years	5.50 - 6.25	5.50 - 6.25	5.50 - 6.25
Dividend rate	0%	0%	0%
Risk-free interest rate	1.90 - 3.96%	0.90 - 1.42%	0.18 - 0.78%
Share price	$0.81-$6.72	$0.48-$2.01	$1.68-$2.03
Fair value of option on grant date	$0.64-$5.95	$0.45-$1.75	$1.27-$1.52

The following table summarizes total stock option activity for all Company plans:

	Equity Plans	Inducement Plan	Total
Options outstanding December 31, 2019	76,636	—	76,636
Granted	4,322	—	4,322
Exercised	—	—	—
Forfeited	(9,260)	—	(9,260)
Expired	(8,267)	—	(8,267)
Options outstanding December 31, 2020	63,431	—	63,431
Granted	908,090	120,000	1,028,090
Exercised	—	—	—
Forfeited	—	—	—
Expired	(22,882)	—	(22,882)
Options outstanding December 31, 2021	948,639	120,000	1,068,639
Granted	190,753	6,332	197,085
Exercised	—	—	—
Forfeited	—	(3,333)	(3,333)
Cancelled Shares	(906,800)	—	(906,800)
Expired	—	—	—
Options outstanding December 31, 2022	232,592	122,999	355,591

The following table summarizes the total number of options outstanding and the weighted-average exercise price:

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value (in thousands)
Options outstanding December 31, 2019		76,636		$	118.79		8.59		254
Granted		4,322		$	25.36
Exercised		—
Forfeited		(9,260	)	$	129.07
Expired		(8,267	)	$	122.83
Options outstanding December 31, 2020		63,431		$	110.40		5.41		—
Granted		1,028,090		$	27.13
Exercised		—
Forfeited		—
Expired		(22,882	)	$	118.49
Options outstanding December 31, 2021		1,068,639		$	30.12		9.42		—
Granted		197,085		$	2.88
Exercised		—
Forfeited		(3,333	)	$	6.15
Cancelled Shares		(906,800	)	$	33.16
Expired		—
Options outstanding December 31, 2022		355,591		$	7.49		9.12		—
Exercisable at December 31, 2022		59,392		$	22.21		8.09

The aggregate intrinsic value of share options is calculated as the difference between the exercise price of the share options and the fair value of the Company’s ordinary shares for those share options that had exercise prices lower than the fair value of the Company’s ordinary shares as of December 31, 2022, December 31, 2021 and December 31, 2020.

The weighted average grant-date fair value per share of share options granted during the years ended December 31, 2022, 2021 and 2020 was $2.39, $23.67 and $19.17, respectively.

Restricted Share Units (RSUs)

The Company granted 66,398 RSUs to directors during the year ended December 31, 2022 and 123,017 RSUs to employees and directors during the year ended December 31, 2021. No RSUs were granted to employees or directors during the year ended December 31, 2020.

The following table summarizes the number of RSUs granted covering an equal number of the Company’s ordinary shares for all of our plans:

	Equity Plans	Inducement Plan	Total
RSUs outstanding December 31, 2019	2,090	—	2,090
Granted	—	—	—
Shares vested	(1,710)	—	(1,710)
Forfeited	(380)	—	(380)
RSUs outstanding December 31, 2020	—	—	—
Granted	89,684	33,333	123,017
Shares vested	(4,000)	—	(4,000)
Forfeited	—	—	—
RSUs outstanding December 31, 2021	85,684	33,333	119,017
Granted	66,398	—	66,398
Shares vested	(48,353)	(8,334)	(56,687)
Forfeited	—	—	—
RSUs outstanding December 31, 2022	103,729	24,999	128,728

The table below shows the total number of RSUs granted and the weighted-average grant date fair value of the total RSUs granted:

	Number of Shares			Weighted Average Grant Date Fair Value per Share
RSUs outstanding December 31, 2019		2,090		$	105.21
Granted		—
Shares vested		(1,710	)	$	105.21
Forfeited		(380	)	$	105.21
RSUs outstanding December 31, 2020		—
Granted		123,017		$	19.32
Shares vested		(4,000	)	$	24.00
Forfeited		—
RSUs outstanding December 31, 2021		119,017		$	19.16
Granted		66,398		$	2.91
Shares vested		(56,687	)	$	21.23
Forfeited		—
RSUs outstanding December 31, 2022		128,728		$	9.87

The fair value of the RSUs is determined on the date of grant based on the market price of the Company’s ordinary shares on that date. The fair value of RSUs is expensed ratably over the vesting period, which is generally one year for directors and two years for employees under our 2018 Plan and four years for employees under our 2021 Inducement Plan. Total expense recognized related to the RSUs was $1,178, $960 and $63 for the years ended December 31, 2022, 2021 and 2020, respectively. Total unamortized compensation expense related to the RSUs was $434 and $1,416 as of December 31, 2022 and December 31, 2021, respectively, and is expected to be recognized over a remaining average vesting period of 0.88 years and 1.89 years as of December 31, 2022 and December 31, 2021, respectively.

No RSUs, which are subject to certain performance-based vesting conditions (Performance RSUs), were awarded during the years ended December 31, 2022 and 2021. The Company awarded 71,927 RSUs to certain employees during the year ended December 31, 2020 which were subject to certain vesting conditions (Performance RSUs).

The table below shows the number of Performance RSUs granted covering an equal number of the Company’s ordinary shares and the weighted-average grant date fair value of the Performance RSUs granted:

	Number of Shares			Weighted Average Grant Date Fair Value per Share
Performance RSUs outstanding December 31, 2019		3,326		$	123.15
Granted		71,927		$	30.71
Shares vested		—
Forfeited		(9,726	)	$	45.75
Performance RSUs outstanding December 31, 2020		65,527		$	33.18
Granted		—
Shares vested		(41,961	)	$	30.90
Expired		(1,733	)	$	29.85
Forfeited		(21,833	)	$	123.15
Performance RSUs outstanding December 31, 2021		—

The weighted average grant date fair value of Performance RSUs with a market condition was determined using the Monte Carlo simulation model. The fair value of Performance RSUs is expensed ratably over the vesting period. Due to the expiration of Performance RSUs, a credit of $0 was recognized for the year ended December 31, 2021. Total expense recognized related to Performance RSUs was $1,560 for the year ended December 31, 2020. All Performance RSUs were fully expensed as of December 31, 2021. Total unamortized compensation expense related to Performance RSUs was $152 for the year ended December 31, 2020, expected to be recognized over a remaining average vesting period of 0.20 years as of December 31, 2020.

The Company’s share-based compensation expense was classified in the consolidated statements of operations and comprehensive loss as follows:

	Year ended December 31,
	2022		2021		2020
Research and development expense	$	1,396	$	1,322	$	754
General and administrative expense		3,362		2,997		2,005

There was a total of $1,363, $22,937 and $1,122 unamortized share-based compensation expense for share options, restricted share units and performance restricted share units as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively, expected to be recognized over a remaining average vesting period of 1.28 years, 3.32 years and 0.80 years as of December 31, 2022, December 31, 2021 and December 31, 2020, respectively.

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Income Taxes

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Income Taxes

(14)Income Taxes

During the years ended December 31, 2022, 2021 and 2020, the Company recorded no income tax benefits for the net operating losses incurred in each year due to its uncertainty of realizing a benefit from those items.

The provision for income taxes consists of the following components:

	Year Ended December 31,
	2022		2021		2020
Current
U.S.	$	301	$	705	$	743
Ireland		—		—		—
Total Current	$	301	$	705	$	743
Deferred
U.S.	$	—	$	—	$	—
Ireland		—		—		—
Total Deferred	$	—	$	—	$	—
Income Tax Provision	$	301	$	705	$	743

Income taxes have been based on the following components of income (loss) before provision for income taxes:

	Year Ended December 31,
	2022			2021			2020
U.S.	$	(13,701	)	$	(34	)	$	696
Ireland		(30,432	)		(90,825	)		(51,959	)
Total	$	(44,133	)	$	(90,859	)	$	(51,263	)

The Irish federal statutory rate is reconciled to the effective tax rate as follows:

	Year Ended December 31, 2022		Year Ended December 31, 2021		Year Ended December 31, 2020
Statutory rate	12.50%	$(5,517)	12.50%	$(11,357)	12.50%	$(6,408)
Impact of U.S. tax rate	4.71%	(2,080)	0.01%	(5)	(0.20)%	105
Impact of valuation allowance	(5.30)%	2,341	(3.64)%	3,304	(6.47)%	3,319
Research and development tax credit	0.00%	—	0.00%	—	0.14%	(71)
Adjustments for current tax of prior periods	(4.19)%	1,851	0.14%	(131)	(1.94)%	995
Cancellation of share options	(9.02)%	3,983	0.00%	—	0.00%	—
Fair value movements on derivative financial instruments	1.55%	(682)	(8.37)%	7,603	(4.34)%	2,227
Other, net	(0.92)%	405	(1.42)%	1,292	(1.13)%	577
Effective tax rate	(0.68)%	$301	(0.78)%	$705	(1.44)%	$743

The significant components of the Company’s deferred tax assets and liabilities are as follows:

	Year Ended December 31,
	2022			2021			2020
Deferred tax assets
Share-based compensation	$	438		$	822		$	650
Depreciation		42			127			31
Net operating loss carryforwards		36,059			33,218			30,261
Other		(11	)		120			41
Valuation allowance		(36,528	)		(34,287	)		(30,983	)
Total deferred tax assets	$	—		$	—		$	—
Deferred tax liabilities		—			—			—
Net deferred tax asset	$	—		$	—		$	—

As a company incorporated in Ireland, it is principally subject to taxation in Ireland.

The Company has net operating loss carryforwards in Ireland of approximately $36,059, $33,218 and $30,261 as of the years ended December 31, 2022, 2021 and 2020, respectively, for which a full valuation allowance has been recognized as it was determined that it is more-likely-than-not that these net deferred tax assets will not be realized. The net operating loss carryforwards do not expire, but are carried forward indefinitely. Realization of these deferred tax assets is dependent on the generation of sufficient taxable income. If the Company demonstrates consistent profitability in the future, the evaluation of the recoverability of these deferred tax assets may change and the remaining valuation allowance may be released in part or in whole. While management expects to realize the deferred tax assets, net of valuation allowances, changes in estimates of future taxable income or in tax laws may alter this expectation.

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows:

	2022			2021
Balance at January 1	$	3,300		$	3,024
(Decrease) / Increase in tax positions		(456	)		276
Balance at December 31	$	2,844		$	3,300

The Company's federal and state income tax returns for 2019 through 2021 remain open to examination by the IRS. The Company's income tax returns in Ireland remain open to examination from 2018 to 2021. The Company is not currently subject to any audits or examination.

In August 2022, the Inflation Reduction Act of 2022 ("IRA") was signed into law in the United States. The IRA created a new corporate alternative minimum tax of 15% on adjusted financial statement income and an excise tax of 1% of the value of certain stock repurchases. The provisions of the IRA will be effective for periods beginning after December 31, 2022. The enactment of the IRA did not result in any material adjustments to the Company's income tax provisions or net deferred tax assets as of December 31, 2022.
 

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Commitment and Contingencies

12 Months Ended

Dec. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

(15)Commitments and Contingencies

License Agreement

On November 18, 2015, the Company entered into a license agreement with Pfizer for the worldwide exclusive rights to research, develop, manufacture and commercialize sulopenem.

As part of the license agreement, the Company is obligated to pay Pfizer potential future regulatory milestone payments, as well as sales milestones upon achievement of net sales ranging from $250.0 million to $1.0 billion for each product type. The Company is also obligated to pay Pfizer royalties ranging from a single-digit to mid-teens percentage based on marginal net sales of each licensed product.

Royalty-Linked Notes

On January 21, 2020, as part of the Private Placement, the Company issued 2,579,400 RLNs to a group of accredited investors. On September 8, 2020, as part of the Rights Offering, the Company issued 11,000 RLNs to existing shareholders. The RLNs will entitle the holders thereof to payments, at the applicable payment rate, based solely on a percentage of the Company’s net revenues from U.S. sales of specified sulopenem products earned through December 31, 2045, but will not entitle the holders thereof to any payments unless the Company receives FDA approval for one or more specified sulopenem products prior to December 31, 2025 and the Company earns net revenues on such product. If any portion of the principal amount of the outstanding RLNs, equal to $0.04 per RLN, has not been paid as of the end date on December 31, 2045 (or December 31, 2025, in the event that the Company has not yet received FDA approval with respect to one or more specified sulopenem products by such date), Iterum Bermuda must pay the unpaid portion of the principal amount. The RLNs will earn default interest if the Company breaches certain obligations under the RLN Indenture (but do not otherwise bear interest) and will be subject to a maximum return amount, including all principal and payments and certain default interest in respect of uncurable defaults, of $160.00 (or 4,000 times the principal amount of such note). The RLNs will be redeemable at the Company’s option, subject to the terms of the RLN Indenture.

Legal Proceedings

On August 5, 2021, a putative class action lawsuit was filed against the Company, its Chief Executive Officer and Chief Financial Officer in the United States District Court for the Northern District of Illinois. The complaint was purported to be brought on behalf of shareholders who purchased the Company's securities between November 30, 2020 and July 26, 2021. The complaint generally alleged that the defendants violated Section 10(b) and/or 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder by making purportedly material misstatements or omissions concerning the Company’s submission of its NDA to the FDA for marketing approval of oral sulopenem for the treatment of uUTIs in patients with a quinolone non-susceptible pathogen and the likelihood of such approval. The complaint sought, among other things, unspecified damages, attorneys' fees, expert fees and other costs. The court appointed a lead plaintiff and approved plaintiff’s selection of lead counsel on November 3, 2021. On January 26, 2022, plaintiff filed an amended complaint which included allegations similar to those made in the original complaint and sought similar relief. On April 8, 2022, the Company filed a motion to dismiss with the court seeking dismissal of all claims asserted. Oral argument on the motion to dismiss occurred on August 17, 2022. On December 28, 2022, the count granted the Company's motion to dismiss without prejudice giving the plaintiffs until January 24, 2023 to file an amended complaint. As no amended complaint was filed, the dismissal was converted to a dismissal with prejudice on January 25, 2023.

Other Contingencies

Liabilities for loss contingencies arising from claims, assessments, litigation, fines, penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. At each reporting date the Company evaluates whether or not a potential loss amount or a potential loss range is probable and reasonably estimable under the provisions of the authoritative guidelines that address accounting for contingencies. The Company expenses costs as incurred in relation to such legal proceedings. The Company has no contingent liabilities in respect of legal claims arising in the ordinary course of business.

Under the terms of their respective employment agreements, each of the named executive officers is eligible to receive severance payments and benefits upon a termination without “cause” (other than due to death or disability) or upon “resignation for good reason”, contingent upon the named executive officer’s continued performance for the Company. Under the terms of the Employee Severance Plan approved by the Compensation Committee in January 2022, an employee, who is not an executive officer of the Company, is entitled to severance pay and benefits on a "qualifying termination", that is termination at any time during the period beginning on the date that is 30 days prior to and ending on the date that is 12 months following a change of control without "cause" (other than due to death or disability) based on the employee's level/salary grade.

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Condensed Consolidating Financial Statements

12 Months Ended

Dec. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Condensed Consolidating Financial Statements

(16)Condensed Consolidating Financial Statements

On January 21, 2020, the Company completed a Private Placement pursuant to which its wholly owned subsidiary, Iterum Bermuda, issued and sold $51,588 aggregate principal amount of Exchangeable Notes and $103 aggregate principal amount of RLNs to a group of accredited investors. On September 8, 2020, the Company completed a Rights Offering pursuant to which Iterum Bermuda issued and sold $220 aggregate principal amount of Exchangeable Notes and $0.44 aggregate principal amount of RLNs to existing shareholders. The Securities were sold in Units with each Unit consisting of an Exchangeable Note in the original principal amount of $1,000 and 50 RLNs. As of December 31, 2022, $12,607 million aggregate principal amount of Exchangeable Notes and all RLNs remained outstanding.

The Units were issued by Iterum Bermuda, which was formed on November 6, 2019 and is a 100% owned “finance subsidiary” of the Company under Rule 3-10 of Regulation S-X with no independent function and no assets or operations other than those related

to the issuance, administration and repayment of the Exchangeable Notes and RLNs. Iterum Therapeutics plc, as the parent company, has no independent assets or operations, and its operations are conducted solely through its subsidiaries. The assets, liabilities and results of operations of the Company, Iterum Bermuda and Iterum Therapeutics International Limited, Iterum Therapeutics US Holding Limited and Iterum Therapeutics US Limited (the Subsidiary Guarantors) are not materially different than the corresponding amounts presented in the consolidated financial statements of this Annual Report on Form 10-K. The Company and the Subsidiary Guarantors have provided a full and unconditional guarantee of Iterum Bermuda’s obligations under the Exchangeable Notes and the RLNs, and each of the guarantees constitutes the joint and several obligations of the applicable guarantor. The Subsidiary Guarantors are 100% directly or indirectly owned subsidiaries of the Company. There are no significant restrictions upon the Company’s or the Subsidiary Guarantors’ ability to obtain funds from their subsidiaries by dividend or loan. None of the assets of Iterum Bermuda or the Subsidiary Guarantors represent restricted net assets pursuant to Rule 4-08(e)(3) of Regulation S-X.

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Subsequent Events

12 Months Ended

Dec. 31, 2022

Subsequent Events [Abstract]

Subsequent Events

(17) Subsequent Events

The Company considers events and transactions that occur after the balance sheet date but prior to the issuance of the consolidated financial statements for potential recognition and disclosure in the consolidated financial statements.

The Company has a banking relationship with SVB. On March 10, 2023, SVB was closed by the California Department of Financial Protection and Innovation, which appointed the FDIC as receiver. On March 12, 2023, the Federal Reserve Board approved actions enabling the FDIC to complete its resolution of SVB in a manner that fully protects all depositors. Based on the foregoing and the Company's analysis of the components of its relationship with SVB, the Company does not expect these events to have a material impact on the Company's consolidated financial statements.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Going concern

In accordance with Accounting Standards Update (ASU) 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (Subtopic 205-40), the Company has evaluated whether there are conditions and events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year of the date of issue of the consolidated financial statements.

The Company has funded its operations to date primarily with proceeds from the sale of preferred shares and ordinary shares, warrants, debt raised under its financing arrangement with SVB including the PPP loan (both of which have been repaid), payments received under the CARB-X program and proceeds of the Private Placement and Rights Offering. The Company has incurred operating losses since inception, including net losses of $44,434, $91,564 and $52,006 for the years ended December 31, 2022, 2021 and 2020, respectively. The Company had an accumulated deficit of $422,927 as of December 31, 2022 and expects to continue to incur net losses for the foreseeable future. Management believes that its cash and cash equivalents balance of $21,092 and short-term investments of $39,712 at December 31, 2022 are sufficient to fund operations until mid-2024. In making this assessment management have considered the planned operations of the company and the ability to adjust its plans if required.

In addition, in parallel, the Company is evaluating its corporate, strategic, financial and financing alternatives, with the goal of maximizing value for its stakeholders. These alternatives could potentially include the licensing, sale or divestiture of the Company’s assets or proprietary technologies, a sale of the Company, a merger or other business combination or another strategic transaction involving the Company. The evaluation of corporate, strategic, financial and financing alternatives may not result in any particular action or any transaction being pursued, entered into or consummated, and there is no assurance as to the timing, sequence or outcome of any action or transaction or series of actions or transactions.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, the valuation of share-based compensation awards, the valuation of the RLNs and the Derivative liabilities, which consist of embedded features in the Exchangeable Notes, and the accrual for research and development expenses. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates as there are changes in circumstances, facts and experience. Actual results could differ materially from those estimates.

Specifically, management has estimated variables used to calculate the discounted cash flow analysis (DCF) and assumptions used in the binomial option pricing model to value derivative instruments (see Note 3 – Fair Value of Financial Assets and Liabilities).

Comprehensive Loss

Comprehensive Loss

Comprehensive loss includes net loss as well as other changes in stockholders’ equity that result from transactions and economic events other than those with shareholders. For the year ended December 31, 2022, these changes related to unrealized gains and losses on the Company’s available-for-sale short-term investments. For the year ended December 31, 2021, there was no difference between net loss and comprehensive loss. There were no reclassifications out of comprehensive loss for the years ended December 31, 2022 and 2021.

Consolidation

Consolidation

The accompanying consolidated financial statements include the accounts of Iterum Therapeutics plc and its wholly owned subsidiaries (which are referred to herein, collectively, as the Company where context requires). All significant intercompany balances and transactions have been eliminated on consolidation. The Company has no involvement with variable interest entities.

Short-term investments

Short-term Investments

The Company's investments consist primarily of debt securities, including investment-grade corporate bonds. The Company considers its portfolio of investments to be available-for-sale. Accordingly, these investments are recorded at fair value, which is based on quoted market prices. Investments with maturities beyond one year are generally classified as short term, based on their highly liquid nature and because such marketable securities represent the investment of cash that is available for current operations. Unrealized gains and losses are reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity.

Realized gains and losses and declines in value are included as a component of other income (expense), net based on the specific identification method. Any credit impairments are recorded through an allowance account.

Cash and Cash Equivalents

Cash and Cash Equivalents

The Company’s cash and cash equivalents consist of cash balances and highly liquid investments with maturities of three months or less at the date of purchase. Accounts held at U.S. financial institutions are insured by the Federal Deposit Insurance Corporation (FDIC) up to $250, while accounts held at Irish financial institutions are insured under the Deposit Guarantee Scheme up to $107 (€100).

Cash accounts with any type of restriction are classified as restricted cash. If restrictions are expected to be lifted in the next twelve months, the restricted cash account is classified as current. Included within restricted cash on the Company’s consolidated balance sheet is $17 and $17 for the years ended December 31, 2022 and 2021, respectively, relating to the warrants issued on June 5, 2020 pursuant to the securities purchase agreement (June 3, 2020 SPA) in the June 3, 2020 registered direct offering (June 3, 2020 Offering), $6 and $6 for the years ended December 31, 2022 and 2021, respectively, relating to the warrants issued on July 2, 2020 pursuant to the securities purchase agreement (June 30, 2020 SPA) in the June 30, 2020 registered direct offering (June 30, 2020 Offering) and $11 and $11 for the years ended December 31, 2022 and 2021, respectively, relating to warrants issued in the underwritten offering in October 2020 (October 2020 Offering). On the closing date of each of the registered direct offerings in June 2020 (June 3 Offering) and July 2020 (June 30 Offering) and the underwritten offering in the October 2020 Offering, each investor deposited $0.01 per warrant issued being the nominal value of the underlying ordinary share represented by each warrant. This amount will be held in trust by the Company pending a decision by the relevant investor to exercise the warrant by means of a “cashless exercise” pursuant to the terms of the warrant, in which case the $0.01 will be used to pay up the nominal value of the ordinary share issued pursuant to the warrant. Upon the exercise of the warrants other than by means of a "cashless exercise", the amount held in trust will be returned to the relevant investor in accordance with the terms of the applicable purchase agreement or prospectus. Also included within restricted cash on the Company’s consolidated balance sheet is a certificate of deposit for $30 for the year ended December 31, 2021, which was being held by a third party bank as collateral for the irrevocable letter of credit issued in March 2018 to secure an office lease (see Note 8 – Leases).

Foreign Currencies

Foreign Currencies

Items included in the consolidated financial statements are measured using the currency of the primary economic environment in which the entity operates (functional currency). The consolidated financial statements are presented in U.S. dollars.

Transactions in foreign currencies are recorded at the rate of exchange at the date of the transaction. Monetary assets and liabilities denominated in foreign currencies at the balance sheet date are retranslated into the functional currency at the rate of exchange at the balance sheet date, and the resulting gains and losses are recognized in the consolidated statement of operations and comprehensive loss. Non-monetary items in a foreign currency that are measured in terms of historical cost are translated using the exchange rate at the date of transaction.

Intangible Assets

Intangible Assets

The Company’s finite-lived intangible asset is stated at cost less accumulated amortization. The Company calculates amortization expense using the straight-line method over the estimated useful life of the related asset which the Company believes reasonably represents the time period in which the economic benefit of the intangible asset is consumed or otherwise realized. The Company reviews the recoverability of the finite-lived intangible asset and, when there are indications that this asset is more likely than not to have become impaired, will test for impairment.

Property and Equipment

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation. Property and equipment are depreciated using the straight-line method over the estimated useful life of each asset as follows:

	Estimated Useful Life
Leasehold improvements	Shorter of life of lease or 10 years
Furniture and fixtures	5 years
Laboratory equipment	5 years
Computer equipment	3 years

Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is included in loss from operations. Repairs and maintenance costs are expensed as incurred. The Company reviews the recoverability of all long-lived assets, including the related useful life, whenever events or changes in circumstances indicate that the carrying amount of a long-lived asset might not be recoverable.

Leases

Leases

The Company determines if an arrangement contains a lease at inception. For arrangements that contain a lease, lease classification, recognition, and measurement are determined at the lease commencement date. The Company has elected to separately account for lease and non-lease components in determining the lease liabilities and right-of-use assets. Lease liabilities and their corresponding right-of-use assets are recorded based on the present value of lease payments over the expected lease term. The Company’s lease agreements generally do not provide an implicit borrowing rate, therefore the Company uses its incremental borrowing rate at lease commencement to determine the present value of lease payments. The incremental borrowing rate is an entity-specific rate which represents the rate of interest a lessee would pay to borrow on a collateralized basis over a similar term with similar payments. All operating lease expenses are recognized on a straight-line basis over the lease term.

Research and Development Expenses

Research and Development Expenses

The Company expenses the cost of research and development as incurred. Research and development expenses comprise costs incurred in performing research and development activities, including salaries, share-based compensation and benefits, facilities costs, depreciation, amortization, manufacturing expenses and external costs of third-parties engaged to supply active pharmaceutical ingredient and drug product and conduct preclinical and clinical development activities and trials, as well as the cost of licensing technology, license fees, and other external costs. Advance payments for goods and services that will be used in future research and development activities are recorded as prepaid expenses and expensed when the activity is performed or when the goods have been received.

Accrued Research And Development Expenses

Accrued Research and Development Expenses

The Company has entered into various research and development contracts with research institutions and other companies. These agreements are generally cancelable, and related payments are recorded as research and development expenses as incurred. This process involves reviewing open contracts and purchase orders, communicating with Company personnel to identify services that have been performed on the Company’s behalf and estimating the level of service performed and the associated cost incurred for the service when the Company has not yet been invoiced or otherwise notified of actual costs. The majority of the Company’s service providers invoice in arrears for services performed, on a pre-determined schedule or when contractual milestones are met; however, some require advanced payments. The Company estimates accrued expenses as of each balance sheet date in the consolidated financial statements based on facts and circumstances known at that time. It periodically confirms the accuracy of these estimates with the service providers and makes adjustments if necessary. Examples of estimated accrued research and development expenses include fees paid to:

•Vendors, including central laboratories, in connection with preclinical development activities;

•Clinical Research Organizations, or CROs, and investigative sites in connection with preclinical studies and clinical trials; and

•Contract Manufacturing Organizations, or CMOs, in connection with drug substance and drug product formulation of preclinical and clinical trial materials.

The Company bases expenses related to preclinical studies and clinical trials on estimates of the services received and efforts expended pursuant to quotes and contracts with multiple research institutions and CROs that conduct and manage preclinical studies and clinical trials on its behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to vendors will exceed the level of services provided and result in a prepayment of the expense. Payments under some of these contracts depend on factors such as the successful enrollment of patients and the completion of clinical trial milestones. In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, the accrual or the amount of prepaid expenses is adjusted accordingly. Although the Company does not expect the estimates to be materially different from amounts actually incurred, its understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in reporting amounts that are too high or too low in any particular period. To date, there have not been any material adjustments to prior estimates of accrued research and development expenses.

Patent Costs

Patent Costs

All patent related costs incurred in connection with filing and prosecuting patent applications are expensed as incurred due to the uncertainty about the recovery of the expenditure. Amounts incurred are classified as general and administrative expenses.

Share-Based Compensation

Share-Based Compensation

The Company measures share-based awards granted to employees and directors with service based vesting conditions only based on the fair value on the date of grant using the Black-Scholes option-pricing model. Compensation expense of those awards is recognized over the requisite service period, which is generally the vesting period of the respective award, using the straight-line method.

The Company measures share-based awards granted to employees and directors with both performance and service based vesting conditions based on the fair value on the date of grant using the Monte Carlo simulation model. Compensation expense of those awards is recognized over the determined vesting period, the period over which all the specified vesting conditions are to be satisfied, using the straight-line method.

For awards granted to consultants and non-employees, compensation expense is recognized over the period during which services are rendered until completed. At the end of each financial reporting period prior to completion of the service, the fair value of these awards is remeasured using the then-current fair value of the Company’s ordinary shares and updated assumption inputs in the Black-Scholes option-pricing model or the Monte Carlo simulation model.

The Company classifies share-based compensation expense in the consolidated statement of operations and comprehensive loss in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified.

The Black-Scholes option-pricing model uses key inputs and assumptions including the expected term of the option, share price volatility, risk-free interest rate, dividend yield, share price and exercise price which is equivalent to closing market value on the date of grant. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of share-based compensation expense.

The Monte Carlo simulation model uses key inputs and assumptions including share price volatility, risk-free interest rate, the expected date of satisfaction of vesting conditions and share price. Many of the assumptions require significant judgment and any changes could have a material impact in the determination of share-based compensation expense.

The Company has elected to account for forfeitures as they occur.

Grant Awards

Grant Awards

The Company may generate revenue from grant awards that reimburse certain allowable costs for specified projects. For contracts with third parties, when the Company has concluded that it is the principal in conducting the research and development, and where the funding arrangement is considered central to the Company’s ongoing operations, it classifies the recognized funding received as revenue.

Research and Development Credits

Research and Development Credits

Research and development credits are available to the Company under the tax laws in both Ireland and the United States, based on qualifying research and development spend in each jurisdiction as defined under those tax laws. Research and development credits are generally recognized as a reduction of research and development expenses.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

FASB guidance specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).

The three levels of the fair value hierarchy are as follows:

•Level 1 — Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 1 primarily consists of financial instruments whose value is based on quoted market prices such as exchange-traded instruments and listed equities.

•Level 2 — Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly (e.g. quoted prices of similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in markets that are not active). Level 2 includes financial instruments that are valued using models or other valuation methodologies.

•Level 3 — Unobservable inputs for the asset or liability. Financial instruments are considered Level 3 when their fair values are determined using pricing models, discounted cash flows or similar techniques and at least one significant model assumption or input is unobservable.

The Company’s short-term investments, RLNs and Derivative liability are carried at fair value, determined according to the fair value hierarchy above, see Note 3 for further details. The carrying amounts reported in the consolidated balance sheets for cash and cash equivalents, prepaid expenses and other current assets, accounts payable accrued expenses and other liabilities approximate their fair value based on the short-term maturity of these instruments.

Borrowings

Borrowings

Interest bearing long-term debt is recognized initially at fair value, net of transactions costs incurred. Subsequent to initial recognition, interest bearing long-term debt is measured at amortized cost with any difference between cost and redemption value being recognized as a non-cash component of interest expense in the income statement over the period of the borrowings on an effective interest basis.

Derivative Liability

Derivative Liability

The Company accounts for derivative instruments in accordance with ASC 815, which establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other financial instruments or contracts which require bifurcation and measurement at fair value for accounting purposes on the balance sheet date. Any liabilities recorded at fair value are revalued each reporting period with the resulting change in fair value reflected in adjustments to fair value of derivatives.

In determining the appropriate fair values, the Company uses the binomial option pricing model, and in the case of the change of control component, in combination with a DCF analysis, which is discussed in Note 3 – Fair Value of Financial Assets and Liabilities. The Company’s derivative financial instruments consist of embedded features in the Exchangeable Notes. The embedded derivatives include provisions that provide the noteholder with certain exchange rights and protections on a fundamental change such as a change of control. The effects of interactions between embedded derivatives are calculated and accounted for in arriving at the overall fair value of the financial instruments.

Royalty-Linked Notes

Royalty-Linked Notes

On recognition, the RLNs qualified as debt instruments under ASC 470, Debt, and were initially recorded at fair value, applying a DCF model, and then subsequently measured at amortized cost. In January 2021, the RLNs were exchange listed, and therefore, derivative accounting has been applied in accordance with ASC 815, Derivatives and Hedging, which establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other financial instruments or contracts which require bifurcation and measurement at fair value for accounting purposes on the balance sheet date. Any liabilities recorded at fair value are revalued at each reporting period with the resulting change in fair value reflected in adjustments to fair value of derivatives.

Ordinary Share Warrants

Ordinary Share Warrants

1.The Company accounts for ordinary share warrants in accordance with applicable accounting guidance provided in ASC 815, Derivatives and Hedging – Contracts in Entity's Own Equity, as either derivative liabilities or as equity instruments depending on the specific terms of the warrant agreement. Any warrants that (i) require physical settlement or net-share settlement or (ii) provide the Company with a choice of net-cash settlement or settlement in its own shares (physical settlement or net-share settlement), provided that such warrants are indexed to the Company's own shares is classified as equity. The Company completed a number of offerings containing freestanding derivatives which satisfy the criteria for

classification as equity instruments as the warrants do not contain cash settlement features or variable settlement provision that cause them to not be indexed to the Company's own stock. The Company assesses classification of its ordinary share warrants at each reporting date to determine whether the instruments still qualify for the scope exception under ASC 815.

Concentration of Credit Risk

Concentration of Credit Risk

Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, cash equivalents and short-term investments. The Company has most of its cash, cash equivalents and short-term investments at three accredited financial institutions in the United States and Ireland, in amounts that exceed federally insured limits. The Company does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships.

Income Taxes

Income Taxes

The Company accounts for income taxes under the asset and liability method which requires deferred tax assets and liabilities to be recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, as well as net operating loss carryforwards and research and development tax credits.

Valuation allowances are provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized.

Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that has a greater than 50% likelihood of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest related to unrecognized tax benefits in interest expense and penalties in general and administrative expenses.

Net Loss Per Ordinary Share

Net Loss Per Ordinary Share

Basic and diluted net loss per ordinary share is determined by dividing net loss attributable to ordinary shareholders by the weighted-average ordinary shares outstanding during the period in accordance with ASC 260, Earnings per Share. For the periods presented, the following ordinary shares underlying the options, unvested restricted share units, unvested performance restricted share units, warrants and the Exchangeable Notes have been excluded from the calculation because they would be anti-dilutive.

	Year ended December 31,
	2022		2021		2020
Options to purchase ordinary shares		355,591		1,068,639		63,431
Unvested restricted share units		128,728		119,017		—
Unvested performance restricted share units		—		—		65,527
Warrants		480,186		480,186		1,629,619
Exchangeable Notes		1,287,660		1,217,386		4,715,004
Total		2,252,165		2,885,228		6,473,581

Segment and Other Information

Segment and Other Information

The Company determines and presents operating segments based on the information that is internally provided to the Chief Executive Officer, Chief Financial Officer and Chief Medical Officer, who together are considered the Company’s chief operating decision maker, in accordance with ASC 280, Segment Reporting. The Company has determined that it operates as a single business segment, which is the development and commercialization of innovative treatments for drug resistant bacterial infections.

The distribution of total operating expenses by geographical area was as follows:

	Year ended December 31,
Operating expenses	2022		2021		2020
Ireland	$	22,015	$	15,926	$	23,423
U.S.		8,332		8,554		8,703
Bermuda		36		57		—
Total	$	30,383	$	24,537	$	32,126

The distribution of long-lived assets by geographical area was as follows:

Long lived assets	December 31, 2022		December 31, 2021
Ireland	$	4,052	$	7,601
U.S.		303		578
Total	$	4,355	$	8,179

Retirement Plan

Retirement Plan

The Company has a defined contribution plan under Section 401(k) of the Internal Revenue Code (the 401(k) Plan). The 401(k) Plan covers all U.S. employees who meet defined minimum age and service requirements, and allows participants to defer a portion of their annual compensation on a pre-tax basis. If the 401(k) Plan is considered top-heavy at the end of the financial year, with key employee accounts accounting for greater than 60% of total 401(k) Plan assets, the Company is required to contribute a deferral rate of up to 3% to the 401(k) Plan on behalf of certain employees. The Company was not required to make a top-heavy contribution for the years ended December 31, 2022, 2021 and 2020.

Inventory

Inventory

Inventories are valued at the lower of cost or net realizable value. Cost is determined using the first-in, first-out method for all inventories. The Company’s policy is to write down inventory that has become obsolete, inventory that has a cost basis in excess of its expected net realizable value and inventory in excess of expected requirements. The estimate of excess quantities is subjective and primarily dependent on the estimates of future demand for a particular product. If the estimate of future demand changes, the Company considers the impact on the reserve for excess inventory and adjusts the reserve as required. Increases in the reserve are recorded as charges in cost of product sales. For product candidates that have not been approved by the FDA, inventory used in clinical trials is expensed at the time of production and recorded as research and development expenses. For products that have been approved by the FDA, inventory used in clinical trials is expensed at the time the inventory is packaged for the clinical trial. Prior to an advisory committee providing a recommendation to the FDA that the Company’s application should be approved, costs related to manufacturing the product candidates are recorded as research and development expenses. All direct manufacturing costs incurred after this recommendation will be capitalized into inventory. The Company had no inventory as of December 31, 2022 or December 31, 2021.

Contingent Consideration

Contingent Consideration

Certain license agreements contain milestone payments that could result in the requirement to make contingent consideration payments, see Note 15 for further details. Contingent consideration is recorded at the acquisition date estimated fair value of the contingent payment. The fair value of the contingent consideration is measured at each reporting period. Any related unwinding of discount is recognized as a finance expense. Other changes in fair value are recognized in profit or loss or capitalized as an intangible asset depending on the stage of development. As of December 31, 2022, no milestones had been met that required the Company to recognize contingent consideration.

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity, which reduces the number of accounting models for convertible instruments and allows more contracts to qualify for equity classification. The ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2021. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

In May 2021, the FASB issued ASU 2021-04, Earnings Per Share (Topic 260), Debt—Modifications and Extinguishments (Subtopic 470-50), Compensation—Stock Compensation (Topic 718), and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options, which clarifies an issuer’s accounting for modifications or exchanges of freestanding written call options that remain equity-classified after modification. The ASU 2021-04 is effective for all entities for interim and annual periods in fiscal years beginning after December 15, 2021. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

In July 2021, the FASB issued ASU 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments, which requires a lessor to classify a lease with entirely or partially variable payments that do not depend on an index or rate as an operating lease if a different classification would result in a commencement date selling loss (Day 1 loss). For entities that have adopted ASU 2016-02, Leases, as of July 19, 2021, ASU 2021-05 is effective for annual and interim periods in fiscal years beginning after December 15, 2021 for public business entities and annual periods in fiscal years beginning after December 15, 2021 and interim periods in fiscal years beginning after December 15, 2022 for all other entities. The new standard became effective for the Company on January 1, 2022 and did not have a material impact on the Company’s consolidated financial statements.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the FASB or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of Property and Equipment Depreciated Using the Straight-Line Method Over the Estimated Useful Life of Each Asset

Property and equipment are stated at cost less accumulated depreciation. Property and equipment are depreciated using the straight-line method over the estimated useful life of each asset as follows:

	Estimated Useful Life
Leasehold improvements	Shorter of life of lease or 10 years
Furniture and fixtures	5 years
Laboratory equipment	5 years
Computer equipment	3 years

Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares Outstanding

For the periods presented, the following ordinary shares underlying the options, unvested restricted share units, unvested performance restricted share units, warrants and the Exchangeable Notes have been excluded from the calculation because they would be anti-dilutive.

	Year ended December 31,
	2022		2021		2020
Options to purchase ordinary shares		355,591		1,068,639		63,431
Unvested restricted share units		128,728		119,017		—
Unvested performance restricted share units		—		—		65,527
Warrants		480,186		480,186		1,629,619
Exchangeable Notes		1,287,660		1,217,386		4,715,004
Total		2,252,165		2,885,228		6,473,581

Schedule of Distribution of Total Operating Expenses by Geographical Area

The distribution of total operating expenses by geographical area was as follows:

	Year ended December 31,
Operating expenses	2022		2021		2020
Ireland	$	22,015	$	15,926	$	23,423
U.S.		8,332		8,554		8,703
Bermuda		36		57		—
Total	$	30,383	$	24,537	$	32,126

Schedule of Distribution of Long-Lived Assets by Geographical Area

The distribution of long-lived assets by geographical area was as follows:

Long lived assets	December 31, 2022		December 31, 2021
Ireland	$	4,052	$	7,601
U.S.		303		578
Total	$	4,355	$	8,179

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Fair Value of Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of Financial Assets Measured at Fair Value

The following table presents information about the Company’s financial assets that were carried at fair value on a recurring basis on the consolidated balance sheet as of December 31, 2022 and December 31, 2021 and indicates the fair value hierarchy of the valuation inputs utilized to determine such fair value.

December 31, 2022
Assets	Total		Level 1		Level 2		Level 3
Short-term investments:
Corporate bonds	$	7,781	$	—	$	7,781	$	—
Commercial paper		15,232		—		15,232		—
U.S. Treasury bonds		16,699		—		16,699		—
	$	39,712	$	—	$	39,712	$	—
December 31, 2021
Assets	Total		Level 1		Level 2		Level 3
Short-term investments:
Corporate bonds	$	31,703	$	—	$	31,703	$	—
Commercial paper		5,293		—		5,293		—
U.S. Treasury bonds		16,902		—		16,902		—
	$	53,898	$	—	$	53,898	$	—

Summary of Long-term Debt And Exchangeable Notes Carried at Amortized Cost on Consolidated Balance Sheet

The following table presents information about the Company’s debt, Exchangeable Notes, Derivative liability and RLNs and indicates the fair value hierarchy of the valuation inputs utilized to determine the approximate fair value:

December 31, 2022
Liabilities	Book Value		Approximate Fair Value		Level 1		Level 2		Level 3
Exchangeable Notes
Long-term exchangeable notes	$	10,094	$	10,827	$	—	$	10,827	$	—
Derivative liability - exchange option and change of control		196		196		—		—		196
Revenue Futures
Royalty-linked notes		18,372		18,372		—		—		18,372
Total	$	28,662	$	29,395	$	—	$	10,827	$	18,568
December 31, 2021
Liabilities	Book Value		Approximate Fair Value		Level 1		Level 2		Level 3
Debt
Current portion of long-term debt	$	1,627	$	1,627	$	—	$	1,627	$	—
Exchangeable Notes
Long-term exchangeable notes		6,930		9,495		—		9,495		—
Derivative liability - exchange option and change of control		6,058		6,058		—		—		6,058
Revenue Futures
Royalty-linked notes		17,968		17,968		—		—		17,968
Total	$	32,583	$	35,148	$	—	$	11,122	$	24,026

Summary of Changes in Fair Value of Derivative Liability

The following table presents the changes in fair value of the Company's Derivative liability:

	Year Ended December 31, 2022			Year Ended December 31, 2021
Balance at January 1	$	6,058		$	28,865
Conversion of Exchangeable Notes		—			(80,512	)
Adjustment to fair value		(5,862	)		57,705
Balance at December 31	$	196		$	6,058

Summary of Assumptions Used to Determine Fair Value of Options

The range of assumptions that the Company used to determine the grant date fair value of employee and director options granted were as follows:

	Year Ended December 31,
	2022	2021	2020
Volatility	100 - 130%	120 - 140%	90.3 - 99.5%
Expected term in years	5.50 - 6.25	5.50 - 6.25	5.50 - 6.25
Dividend rate	0%	0%	0%
Risk-free interest rate	1.90 - 3.96%	0.90 - 1.42%	0.18 - 0.78%
Share price	$0.81-$6.72	$0.48-$2.01	$1.68-$2.03
Fair value of option on grant date	$0.64-$5.95	$0.45-$1.75	$1.27-$1.52

Binomial Option Pricing Model

Summary of Assumptions Used to Determine Fair Value of Options

The following summary table shows the assumptions used in the binomial option pricing model to estimate the fair value of the exchange option:

	December 31, 2022	December 31, 2021
Share price	$0.84	$5.88
Market capitalization	$10,582,858	$71,647,911
Volatility	100%	130%
Risk-free interest rate	4.46%	1.00%
Dividend rate	0%	0%

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Short-term Investments (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Schedule of Available for Sale Short-term Investments by Major Security Type

The following table represents the Company’s available-for-sale short-term investments by major security type as of December 31, 2022:

December 31, 2022					Maturity by period
	Amortized	Unrealized	Unrealized	Fair Value	Less than 1
Available-for-sale	Cost	Gains	(Losses)	Total	Year	1 to 5 Years
Corporate bonds	$7,836	$—	$(55)	$7,781	$7,781	$—
Commercial paper	15,230	2	—	15,232	15,232	—
U.S. Treasury bonds	16,996	—	(297)	16,699	16,699	—
Total	$40,062	$2	$(352)	$39,712	$39,712	$—

The following table represents the Company’s available for sale short-term investments by major security type as of December 31, 2021:

December 31, 2021					Maturity by period
	Amortized	Unrealized	Unrealized	Fair Value	Less than 1
Available-for-sale	Cost	Gains	(Losses)	Total	Year	1 to 5 Years
Corporate bonds	$31,723	$1	$(21)	$31,703	$30,677	$1,026
Commercial paper	5,293	—	—	5,293	5,293	—
U.S. Treasury bonds	16,989	—	(87)	16,902	—	16,902
Total	$54,005	$1	$(108)	$53,898	$35,970	$17,928

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Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2022

Prepaid Expense and Other Assets, Current [Abstract]

Summary of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

	December 31, 2022		December 31, 2021
Prepaid research and development expenses	$	458	$	—
Research and development tax credit receivable		118		840
Prepaid insurance		592		624
Interest receivable		55		290
Value added tax receivable		38		75
Other prepaid assets		42		56
Short-term deposits		35		37
Total	$	1,338	$	1,922

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Intangible Asset, Net (Tables)

12 Months Ended

Dec. 31, 2022

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Summary of Intangible Asset and Related Accumulated Amortization

Intangible asset and related accumulated amortization are as follows:

	December 31, 2022	December 31, 2021
Gross intangible asset	$5,148	$5,148
Less: accumulated amortization	(3,429)	(1,713)
	$1,719	$3,435

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Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment and Related Accumulated Depreciation

Property and equipment and related accumulated depreciation are as follows:

	December 31, 2022			December 31, 2021
Leasehold improvements	$	148		$	148
Furniture and fixtures		120			120
Laboratory equipment		—			86
Computer equipment		85			23
		353			377
Less: accumulated depreciation		(284	)		(286	)
	$	69		$	91

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Leases (Tables)

12 Months Ended

Dec. 31, 2022

Leases [Abstract]

Summary of Right-of-Use Assets and Lease Liabilities

Information related to the Company’s right-of-use assets and related lease liabilities is as follows:

	December 31, 2022		December 31, 2021
Cash paid for operating lease liabilities	$	709	$	944

	December 31, 2022			December 31, 2021
Weighted-average remaining lease term	5.04 years			13.97 years
Weighted-average discount rate		5.5	%		7.0	%

Right-of-use assets and lease liabilities for the Company’s operating leases were recorded in the consolidated balance sheet as follows, representing the Company’s right to use the underlying asset for the lease term (“Other assets”) and the Company’s obligation to make lease payments (“Other current liabilities” and “Other liabilities”):
 

	December 31, 2022	December 31, 2021
Other assets	$1,770	$3,741
Other current liabilities	$332	$464
Other liabilities	1,304	3,436
Total lease liabilities	$1,636	$3,900

Schedule of Future Lease Payments Included in Measurement of Lease Liabilities on Condensed Consolidated Balance Sheet

Future lease payments included in the measurement of lease liabilities on the consolidated balance sheet as of December 31, 2022 for the following five fiscal years and thereafter were as follows:

Due in 12 month period ended December 31,
2023	$407
2024	412
2025	344
2026	295
2027	295
Thereafter	74
	$1,827
Less imputed interest	(191)
Total lease liabilities	$1,636

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Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2022

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following:

	December 31, 2022		December 31, 2021
Accrued payroll and bonus expenses	$	1,971	$	771
Accrued clinical trial costs		1,549		45
Accrued professional fees		606		16
Accrued other expenses		206		256
Accrued manufacturing expenses		14		77
Total	$	4,346	$	1,165

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Debt (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of Principal Payments on Outstanding Debt, Including Principal Amounts owed to RLN Holders

Scheduled principal payments on outstanding debt, including principal amounts owed to RLN holders (see Note 11 – Royalty-Linked Notes) as of December 31, 2022, for the following five fiscal years and thereafter were as follows:

Year Ending December 31,
2023	$—
2024	—
2025	12,607
2026	—
2027	—
Thereafter	104
	$12,711

2025 Exchangeable Notes

Summary of Balance of Exchangeable Notes

The balance of the Exchangeable Notes at each reporting date is as follows:

	December 31, 2022
	Principal	Accrued Interest
January 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	$51,588	$5,058
September 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	220	20
Conversion of $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	(39,201)	(2,697)
2025 Exchangeable Notes	12,607	2,381
Unamortized discount and debt issuance costs	(4,894)	—
2025 Exchangeable Notes, net	$7,713	$2,381

	December 31, 2021
	Principal	Accrued Interest
January 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	$51,588	$4,246
September 2020 $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	220	12
Conversion of $1,000 Exchangeable Notes, 6.5% interest, due January 31, 2025 (2025 Exchangeable Notes)	(39,201)	(2,697)
2025 Exchangeable Notes	12,607	1,561
Unamortized discount and debt issuance costs	(7,238)	—
2025 Exchangeable Notes, net	$5,369	$1,561

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Royalty-Linked Notes (Tables)

12 Months Ended

Dec. 31, 2022

Royalty Linked Notes [Abstract]

Summary of Royalty-Linked Notes

The balance of the RLNs at each reporting date is as follows:

	December 31, 2022
Total liability related to the sale of future royalties, on inception	$10,990
Liability related to the sale of future royalties, arising from the Rights Offering	51
Amortization of discount and debt issuance costs	3,666
Adjustments to fair value	3,665
Total liability related to the sale of future royalties at December 31, 2021	$18,372
Current Portion	—
Long-term Portion	$18,372

	December 31, 2021
Total liability related to the sale of future royalties, on inception	$10,990
Liability related to the sale of future royalties, arising from the Rights Offering	51
Amortization of discount and debt issuance costs	3,666
Adjustments to fair value	3,261
Total liability related to the sale of future royalties at December 31, 2020	$17,968
Current Portion	—
Long-term Portion	$17,968

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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Summary of Assumptions Used to Determine Fair Value of Options

The range of assumptions that the Company used to determine the grant date fair value of employee and director options granted were as follows:

	Year Ended December 31,
	2022	2021	2020
Volatility	100 - 130%	120 - 140%	90.3 - 99.5%
Expected term in years	5.50 - 6.25	5.50 - 6.25	5.50 - 6.25
Dividend rate	0%	0%	0%
Risk-free interest rate	1.90 - 3.96%	0.90 - 1.42%	0.18 - 0.78%
Share price	$0.81-$6.72	$0.48-$2.01	$1.68-$2.03
Fair value of option on grant date	$0.64-$5.95	$0.45-$1.75	$1.27-$1.52

Summary of Stock Options Activity

The following table summarizes total stock option activity for all Company plans:

	Equity Plans	Inducement Plan	Total
Options outstanding December 31, 2019	76,636	—	76,636
Granted	4,322	—	4,322
Exercised	—	—	—
Forfeited	(9,260)	—	(9,260)
Expired	(8,267)	—	(8,267)
Options outstanding December 31, 2020	63,431	—	63,431
Granted	908,090	120,000	1,028,090
Exercised	—	—	—
Forfeited	—	—	—
Expired	(22,882)	—	(22,882)
Options outstanding December 31, 2021	948,639	120,000	1,068,639
Granted	190,753	6,332	197,085
Exercised	—	—	—
Forfeited	—	(3,333)	(3,333)
Cancelled Shares	(906,800)	—	(906,800)
Expired	—	—	—
Options outstanding December 31, 2022	232,592	122,999	355,591

The following table summarizes the total number of options outstanding and the weighted-average exercise price:

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value (in thousands)
Options outstanding December 31, 2019		76,636		$	118.79		8.59		254
Granted		4,322		$	25.36
Exercised		—
Forfeited		(9,260	)	$	129.07
Expired		(8,267	)	$	122.83
Options outstanding December 31, 2020		63,431		$	110.40		5.41		—
Granted		1,028,090		$	27.13
Exercised		—
Forfeited		—
Expired		(22,882	)	$	118.49
Options outstanding December 31, 2021		1,068,639		$	30.12		9.42		—
Granted		197,085		$	2.88
Exercised		—
Forfeited		(3,333	)	$	6.15
Cancelled Shares		(906,800	)	$	33.16
Expired		—
Options outstanding December 31, 2022		355,591		$	7.49		9.12		—
Exercisable at December 31, 2022		59,392		$	22.21		8.09

Summary of Restricted Share Units (RSUs)

The following table summarizes the number of RSUs granted covering an equal number of the Company’s ordinary shares for all of our plans:

	Equity Plans	Inducement Plan	Total
RSUs outstanding December 31, 2019	2,090	—	2,090
Granted	—	—	—
Shares vested	(1,710)	—	(1,710)
Forfeited	(380)	—	(380)
RSUs outstanding December 31, 2020	—	—	—
Granted	89,684	33,333	123,017
Shares vested	(4,000)	—	(4,000)
Forfeited	—	—	—
RSUs outstanding December 31, 2021	85,684	33,333	119,017
Granted	66,398	—	66,398
Shares vested	(48,353)	(8,334)	(56,687)
Forfeited	—	—	—
RSUs outstanding December 31, 2022	103,729	24,999	128,728

The table below shows the total number of RSUs granted and the weighted-average grant date fair value of the total RSUs granted:

Summary of Share-based Compensation Expense

The Company’s share-based compensation expense was classified in the consolidated statements of operations and comprehensive loss as follows:

	Year ended December 31,
	2022		2021		2020
Research and development expense	$	1,396	$	1,322	$	754
General and administrative expense		3,362		2,997		2,005

Performance RSUs

Summary of Restricted Share Units (RSUs)

The table below shows the number of Performance RSUs granted covering an equal number of the Company’s ordinary shares and the weighted-average grant date fair value of the Performance RSUs granted:

	Number of Shares			Weighted Average Grant Date Fair Value per Share
Performance RSUs outstanding December 31, 2019		3,326		$	123.15
Granted		71,927		$	30.71
Shares vested		—
Forfeited		(9,726	)	$	45.75
Performance RSUs outstanding December 31, 2020		65,527		$	33.18
Granted		—
Shares vested		(41,961	)	$	30.90
Expired		(1,733	)	$	29.85
Forfeited		(21,833	)	$	123.15
Performance RSUs outstanding December 31, 2021		—

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense Benefits

The provision for income taxes consists of the following components:

	Year Ended December 31,
	2022		2021		2020
Current
U.S.	$	301	$	705	$	743
Ireland		—		—		—
Total Current	$	301	$	705	$	743
Deferred
U.S.	$	—	$	—	$	—
Ireland		—		—		—
Total Deferred	$	—	$	—	$	—
Income Tax Provision	$	301	$	705	$	743

Summary of Components of Income (Loss) Before Provision for Income Taxes

Income taxes have been based on the following components of income (loss) before provision for income taxes:

	Year Ended December 31,
	2022			2021			2020
U.S.	$	(13,701	)	$	(34	)	$	696
Ireland		(30,432	)		(90,825	)		(51,959	)
Total	$	(44,133	)	$	(90,859	)	$	(51,263	)

Summary of Effective Income Tax Rate

The Irish federal statutory rate is reconciled to the effective tax rate as follows:

	Year Ended December 31, 2022		Year Ended December 31, 2021		Year Ended December 31, 2020
Statutory rate	12.50%	$(5,517)	12.50%	$(11,357)	12.50%	$(6,408)
Impact of U.S. tax rate	4.71%	(2,080)	0.01%	(5)	(0.20)%	105
Impact of valuation allowance	(5.30)%	2,341	(3.64)%	3,304	(6.47)%	3,319
Research and development tax credit	0.00%	—	0.00%	—	0.14%	(71)
Adjustments for current tax of prior periods	(4.19)%	1,851	0.14%	(131)	(1.94)%	995
Cancellation of share options	(9.02)%	3,983	0.00%	—	0.00%	—
Fair value movements on derivative financial instruments	1.55%	(682)	(8.37)%	7,603	(4.34)%	2,227
Other, net	(0.92)%	405	(1.42)%	1,292	(1.13)%	577
Effective tax rate	(0.68)%	$301	(0.78)%	$705	(1.44)%	$743

Summary of Significant Components of Deferred Tax Assets and Liabilities

The significant components of the Company’s deferred tax assets and liabilities are as follows:

	Year Ended December 31,
	2022			2021			2020
Deferred tax assets
Share-based compensation	$	438		$	822		$	650
Depreciation		42			127			31
Net operating loss carryforwards		36,059			33,218			30,261
Other		(11	)		120			41
Valuation allowance		(36,528	)		(34,287	)		(30,983	)
Total deferred tax assets	$	—		$	—		$	—
Deferred tax liabilities		—			—			—
Net deferred tax asset	$	—		$	—		$	—

Summary of Gross Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows:

	2022			2021
Balance at January 1	$	3,300		$	3,024
(Decrease) / Increase in tax positions		(456	)		276
Balance at December 31	$	2,844		$	3,300

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Nature of Operations and Basis of Presentation - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions		12 Months Ended
	Oct. 07, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 17, 2022	Aug. 17, 2022	Jan. 28, 2021	Sep. 08, 2020	Jan. 21, 2020
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net losses		$ 44,434,000	$ 91,564,000	$ 52,006,000
Accumulated deficit		422,927,000	378,493,000
Cash and cash equivalents		21,092,000	$ 27,446,000
Short-term investments		$ 39,712,000
Description of reverse share split		The Company's shareholders approved a reverse share split of the Company's ordinary shares on June 15, 2022, which became effective on August 17, 2022, (the Reverse Share Split). As of 5:00 p.m. Eastern Standard Time on August 17, 2022, every fifteen ordinary shares of $0.01 each (nominal value) in the authorized and unissued and authorized and issued share capital of the Company were consolidated into one ordinary share of $0.15 each (nominal value), and the nominal value of each ordinary share was subsequently reduced from $0.15 to $0.01 nominal value per share.
Ordinary shares, par value		$ 0.01	$ 0.01			$ 0.01	$ 0.01
Reverse share split previous nominal value						0.15
Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of shares and securities may offer and sell					100.0
Sales Agreement with H.C. Wainwright & Co., L.L.C
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Ordinary shares, par value	$ 0.01
Sales Agreement with H.C. Wainwright & Co., L.L.C | Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
May offer and sell ordinary shares for aggregate gross sales proceeds	$ 16,000,000.0
0.01 Nominal Value
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Ordinary shares, par value						0.01
0.15 Nominal Value
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Ordinary shares, par value						$ 0.15
2025 Exchangeable Notes
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Aggregate principal amount		$ 12,607,000,000							$ 9,891,000
2025 Exchangeable Notes | Private Placement and Rights Offering
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Aggregate principal amount								$ 220,000	$ 51,800,000
Debt instrument interest rate									6.50%
RLNs | Private Placement and Rights Offering
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Aggregate principal amount								$ 500	$ 100,000

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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, € in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Segment $ / shares	Dec. 31, 2022 EUR (€)	Aug. 17, 2022 $ / shares	Dec. 31, 2021 USD ($) $ / shares	Jan. 28, 2021 $ / shares
Accounting Policies [Line Items]
Ordinary shares, par value | $ / shares	$ 0.01		$ 0.01	$ 0.01	$ 0.01
Recognized income tax positions measured at largest amount greater than percentage of being realized	50.00%
Number of business segments | Segment	1
Defined Contribution Plan, Tax Status [Extensible Enumeration]	us-gaap:QualifiedPlanMember
Inventory	$ 0			$ 0
Milestone payments	$ 0
October 2020 Offering
Accounting Policies [Line Items]
Ordinary shares, par value | $ / shares	$ 0.01			$ 0.01
June 3, 2020 SPA
Accounting Policies [Line Items]
Ordinary shares, par value | $ / shares	0.01			0.01
June 30, 2020 SPA
Accounting Policies [Line Items]
Ordinary shares, par value | $ / shares	$ 0.01			$ 0.01
Certificates Of Deposit
Accounting Policies [Line Items]
Restricted cash				$ 30,000
Warrants Issued | October 2020 Offering
Accounting Policies [Line Items]
Restricted cash	$ 11,000			11,000
Warrants Issued | June 3, 2020 SPA
Accounting Policies [Line Items]
Restricted cash	17,000			17,000
Warrants Issued | June 30, 2020 SPA
Accounting Policies [Line Items]
Restricted cash	6,000			$ 6,000
Maximum
Accounting Policies [Line Items]
Cash, Federal Deposit Isurance Corporation insured amount	250,000
Cash, DGS insured amount	$ 107,000	€ 100
Defined contribution plan, employee minimum percentage of total plan assets	60.00%
Defined contribution plan, maximum deferral rate	3.00%

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Summary of Significant Accounting Policies - Schedule of Property and Equipment Depreciated Using the Straight-Line Method Over the Estimated Useful Life of Each Asset (Details)	12 Months Ended
	Dec. 31, 2022
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated useful lives	Shorter of life of lease or 10 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Estimated useful life	5 years
Laboratory Equipment
Property Plant And Equipment [Line Items]
Estimated useful life	5 years
Computer Equipment
Property Plant And Equipment [Line Items]
Estimated useful life	3 years

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Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of diluted weighted-average shares outstanding	2,252,165	2,885,228	6,473,581
Options to Purchase Ordinary Shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of diluted weighted-average shares outstanding	355,591	1,068,639	63,431
Unvested Restricted Share Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of diluted weighted-average shares outstanding	128,728	119,017
Unvested Performance Restricted Share Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of diluted weighted-average shares outstanding			65,527
Warrant
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of diluted weighted-average shares outstanding	480,186	480,186	1,629,619
Exchangeable Notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of diluted weighted-average shares outstanding	1,287,660	1,217,386	4,715,004

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Summary of Significant Accounting Policies - Schedule of Distribution of Total Operating Expenses by Geographical Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating expenses	$ 30,383	$ 24,537	$ 32,126
Ireland
Segment Reporting Information [Line Items]
Operating expenses	22,015	15,926	23,423
U.S.
Segment Reporting Information [Line Items]
Operating expenses	8,332	8,554	$ 8,703
Bermuda
Segment Reporting Information [Line Items]
Operating expenses	$ 36	$ 57

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Summary of Significant Accounting Policies - Schedule of Distribution of Long-Lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Long lived assets	$ 4,355	$ 8,179
Ireland
Segment Reporting Information [Line Items]
Long lived assets	4,052	7,601
U.S.
Segment Reporting Information [Line Items]
Long lived assets	$ 303	$ 578

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Fair Value of Financial Assets and Liabilities (Schedule of Financial Assets Measured at Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	$ 39,712	$ 53,898
Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	7,781	31,703
Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	15,232	5,293
U.S. Treasury Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	16,699	16,902
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	39,712	53,898
Level 2 | Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	7,781	31,703
Level 2 | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	15,232	5,293
Level 2 | U.S. Treasury Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	$ 16,699	$ 16,902

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Fair Value of Financial Assets and Liabilities - Summary of Long-term Debt And Exchangeable Notes Carried at Amortized Cost on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative liability - exchange option and change of control	$ 196	$ 6,058	$ 28,865
Book Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Current portion of long-term debt		1,627
Long-term exchangeable note	10,094	6,930
Derivative liability - exchange option and change of control	196	6,058
Royalty-linked notes	18,372	17,968
Total	28,662	32,583
Approximate Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Current portion of long-term debt		1,627
Long-term exchangeable note	10,827	9,495
Derivative liability - exchange option and change of control	196	6,058
Royalty-linked notes	18,372	17,968
Total	29,395	35,148
Level 2 | Approximate Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Current portion of long-term debt		1,627
Long-term exchangeable note	10,827	9,495
Total	10,827	11,122
Level 3 | Approximate Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative liability - exchange option and change of control	196	6,058
Royalty-linked notes	18,372	17,968
Total	$ 18,568	$ 24,026

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Fair Value of Financial Assets and Liabilities - Additional Information (Details) - USD ($)		12 Months Ended	23 Months Ended
	Jan. 21, 2020	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative liability for the exchange option, fair value		$ 49,000	$ 49,000
Derivative liability, change of control feature, fair value		147,000	147,000
RLNs liability		18,372,000	18,372,000
Fair value, asset Level 3 transfers amount		0
Fair value, liabilities Level 3 transfers amount		0
Exchangeable Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal amount of exchangeable notes			39,201,000
Private Placement | Exchangeable Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal amount of exchangeable notes			$ 39,201,000
Debt instrument, aggregate number of shares exchanged			3,592,555
Debt instrument, outstanding principal		$ 12,607,000	$ 12,607,000
Private Placement | Securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument price per ordinary share	$ 15.00	$ 11.3877
Debt instrument, shares embedded within each unit, shares	66.666	87.8139
Debt instrument, shares embedded within each unit, value	$ 1,000	$ 1,000
Private Placement | RLNs
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument, aggregate potential payment capped value	160.00
Debt instrument, aggregate potential payment capped rate	4,000 times
Debt instrument, discount rate applied for royalty linked notes		22.00%	22.00%	20.00%

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Fair Value of Financial Assets and Liabilities - Summary of Changes in Fair Value of Derivative Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Balance at January 1	$ 6,058	$ 28,865
Conversion of Exchangeable Notes		(80,512)
Adjustment to fair value	(5,862)	57,705
Balance at December 31	$ 196	$ 6,058

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Fair Value of Financial Assets and Liabilities - Summary of Assumptions Used Estimate Fair Value of Derivative Liabilities (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Dividend rate	0.00%	0.00%	0.00%
Binomial Option Pricing Model
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Share price	$ 0.84	$ 5.88
Market capitalization	10,582,858	71,647,911
Volatility	100.00%	130.00%
Risk-free interest rate	4.46%	1.00%
Dividend rate	0.00%	0.00%

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Short-term Investments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Average maturity period	4 months 9 days

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Short-term Investments - Schedule of Available for Sale Short-term Investments by Major Security Type (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 40,062	$ 54,005
Unrealized Gains	2	1
Unrealized (Losses)	(352)	(108)
Fair Value Total	39,712	53,898
Maturity by period Less than 1 Year	39,712	35,970
Maturity by period 1 to 5 Years		17,928
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	7,836	31,723
Unrealized Gains		1
Unrealized (Losses)	(55)	(21)
Fair Value Total	7,781	31,703
Maturity by period Less than 1 Year	7,781	30,677
Maturity by period 1 to 5 Years		1,026
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,230	5,293
Unrealized Gains	2
Fair Value Total	15,232	5,293
Maturity by period Less than 1 Year	15,232	5,293
U.S. Treasury Bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	16,996	16,989
Unrealized (Losses)	(297)	(87)
Fair Value Total	16,699	16,902
Maturity by period Less than 1 Year	$ 16,699
Maturity by period 1 to 5 Years		$ 16,902

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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid research and development expenses	$ 458
Research and development tax credit receivable	118	$ 840
Prepaid insurance	592	624
Interest receivable	55	290
Value added tax receivable	38	75
Other prepaid assets	42	56
Short-term deposits	35	37
Total	$ 1,338	$ 1,922

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Intangible Asset, Net - Summary of Intangible Asset and Related Accumulated Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross intangible asset	$ 5,148	$ 5,148
Less: accumulated amortization	(3,429)	(1,713)
Intangible assets, net	$ 1,719	$ 3,435

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Intangible Asset, Net - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Reservation right amortized term	3 years

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Property and Equipment, Net - Schedule of Property and Equipment and Related Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 353	$ 377
Less: accumulated depreciation	(284)	(286)
Property and equipment, net	69	91
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	148	148
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	120	120
Laboratory Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross		86
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 85	$ 23

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Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 84	$ 391	$ 161

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Leases - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Office Space and Commercial Property
Operating Leased Assets [Line Items]
Lessee, operating lease, description	These leases have remaining terms which range from .83 years to 5.49 years
Lessee, operating lease, option to extend	The renewal option on one lease was exercised in February 2022 for an additional period of three years, extending this lease term to June 2025
Lessee, operating lease, renewal term	3 years
Lessee, operating lease renewal reduction in remaining term	16 to six years
Lessee operating lease renewal option on remaining lease term	The renewal option on another lease was derecognized in June 2022 as it is no longer reasonably certain that the option will be exercised, resulting in a reduction in the remaining term from 16 to six years.
Operating lease cost for right - of - use assets	$ 753	$ 1,009	$ 991
Operating lease, rental expenses	243
Sublease Income	$ 293	$ 335	$ 118
Commercial Property
Operating Leased Assets [Line Items]
Lessee operating sublease agreement for commercial unit term	In September 2020, the Company entered into a sublease agreement for a commercial unit that extends through September 2023.
Minimum | Office Space and Commercial Property
Operating Leased Assets [Line Items]
Lessee, operating lease, remaining lease term	9 months 29 days
Maximum | Office Space and Commercial Property
Operating Leased Assets [Line Items]
Lessee, operating lease, remaining lease term	5 years 5 months 26 days

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Leases - Summary of Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Cash paid for operating lease liabilities	$ 709	$ 944
Weighted-average remaining lease term	5 years 14 days	13 years 11 months 19 days
Weighted-average discount rate	5.50%	7.00%

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Leases - Summary of Right-of-Use Assets and Lease Liabilities for Operating Leases Recorded in Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Lease Assets And Liabilities [Abstract]
Other assets	$ 1,770	$ 3,741
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Other current liabilities	$ 332	$ 464
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Other liabilities	$ 1,304	$ 3,436
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Total lease liabilities	$ 1,636	$ 3,900

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Leases - Schedule of Future Lease Payments Included in Measurement of Lease Liabilities on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
2023	$ 407
2024	412
2025	344
2026	295
2027	295
Thereafter	74
Total	1,827
Less imputed interest	(191)
Total lease liabilities	$ 1,636	$ 3,900

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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Accrued payroll and bonus expenses	$ 1,971	$ 771
Accrued clinical trial costs	1,549	45
Accrued professional fees	606	16
Accrued other expenses	206	256
Accrued manufacturing expenses	14	77
Total	$ 4,346	$ 1,165

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Debt - Additional Information (Details)						1 Months Ended		12 Months Ended
	Nov. 02, 2020 USD ($) $ / shares shares	Sep. 08, 2020 USD ($) Debtinstrument $ / shares shares	Apr. 30, 2020 USD ($)	Jan. 21, 2020 USD ($) Debtinstrument $ / shares shares	Apr. 27, 2018 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Nov. 30, 2020 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Mar. 01, 2022
Debt Instrument [Line Items]
Number of warrants to purchase preferred shares | shares								25,333
Accretion of debt discounts and deferred financing costs								$ 2,338,000	$ 4,097,000	$ 10,929,000
Aggregate principal amount								$ 39,201,000
Issuance of ordinary shares on conversion of exchangeable notes (in shares) | shares								3,592,555
Financing transaction costs										2,848,000
Ordinary Shares
Debt Instrument [Line Items]
Number of warrants to purchase preferred shares | shares					1,326			1,326
Issuance of ordinary shares on conversion of exchangeable notes (in shares) | shares									3,592,556
Loan and Security Agreement | Silicon Valley Bank (SVB)
Debt Instrument [Line Items]
Loan and security agreement entered date									Apr. 27, 2018
Funded amount under agreement					$ 15,000,000
Remaining borrowing facility available date					Oct. 31, 2019
Maximum amount available under agreement					$ 30,000,000
Frequency of amortization payments								monthly
Date of first required payment of initial draw					Nov. 01, 2019
Minimum fixed interest rate per annum					8.31%
Final interest rate payment on outstanding principal					4.20%
Final payment fee					$ 630,000
Principal payment during the period					$ 1,552,000
Effective annual interest rate on outstanding debt											12.51%
Interest expense								$ 16,000	$ 556,000	1,355,000
Accretion of debt discounts and deferred financing costs								$ 6,000	142,000	404,000
Loan and Security Agreement | Silicon Valley Bank (SVB) | Wall Street Journal Prime Rate
Debt Instrument [Line Items]
Basis spread on interest rate					3.89%
Loan and Security Agreement | Silicon Valley Bank (SVB) | Maximum
Debt Instrument [Line Items]
Maximum amount available under second draw					$ 15,000,000
Silicon Valley Bank and Life Sciences Fund II LLC | Series B Convertible Preferred Shares
Debt Instrument [Line Items]
Number of warrants to purchase preferred shares | shares					19,890			19,890
Warrants to purchase preferred shares, exercise price | $ / shares					$ 282.75			$ 282.75
2025 Exchangeable Notes
Debt Instrument [Line Items]
Interest expense								$ 820,000	1,078,000	3,180,000
Accretion of debt discounts and deferred financing costs								2,344,000	2,893,000	7,764,000
Aggregate principal amount				$ 9,891,000				12,607,000,000
Debt instrument, outstanding principal								$ 12,607,000	12,607,000
Debt instrument, payment terms								The Company will be required to pay each holder of the Exchangeable Notes the greater of three times the outstanding principal amount of such Exchangeable Note and the consideration that would be received by the holder of such Exchangeable Note in connection with such Fundamental Change if the holder had exchanged its note for ordinary shares immediately prior to the consummation of such Fundamental Change, plus any accrued and unpaid interest.
Fair value of derivative liability				27,038,000
Fair value of derivative liability related to rights offering		$ 82,000
Financing transaction costs										2,848,000
Financing transaction costs, capitalized						$ 2,814,000				2,814,000
2025 Exchangeable Notes | Private Placement
Debt Instrument [Line Items]
Aggregate principal amount				51,588,000
Debt instrument price per unit		1,000		1,000
2025 Exchangeable Notes | Private Placement and Rights Offering
Debt Instrument [Line Items]
Aggregate principal amount		$ 220,000		$ 51,800,000
Debt instrument interest rate				6.50%
RLNs | Private Placement
Debt Instrument [Line Items]
Aggregate principal amount				$ 103,000
Number of debt instruments within each notes | Debtinstrument		50		50
RLNs | Private Placement and Rights Offering
Debt Instrument [Line Items]
Aggregate principal amount		$ 500		$ 100,000
Securities | Private Placement
Debt Instrument [Line Items]
Debt instrument price per unit		$ 1,000		$ 1,000
Debt instrument, shares embedded within each unit, shares | shares	87.8139	66.666		66.666
Debt instrument, shares embedded within each unit, value	$ 1,000	$ 1,000		$ 1,000
Debt instrument, shares embedded within each unit, exchange price | $ / shares	$ 11.3877	$ 15.00		$ 15.00
Paycheck Protection Program | Silicon Valley Bank (SVB) | Iterum Therapeutics US Limited
Debt Instrument [Line Items]
Interest expense								$ 0	2,000	1,000
Aggregate principal amount			$ 744,000
Debt instrument interest rate			1.00%
Debt instrument maturity period			2 years
Debt instrument, description								Under the terms of the agreement, there were no payments due by the Company until the SBA remitted the forgiveness amount to Iterum US Limited or until after the 10 months after the end of the six-month period beginning April 30, 2020 (the Deferral Period). Following the Deferral Period, equal monthly repayments of principal and interest were due to fully amortize the principal amount outstanding on the PPP loan by the maturity date.
Debt instrument, forgiveness loan							$ 340,000
Debt instrument, remaining amount amortized						$ 404,000
Debt Instrument, principal repayments								$ 69,000	$ 309,000	$ 26,000

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Debt - Summary of Balances of Exchangeable Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Exchangeable Notes, net	$ 12,711
January 2020 $1,000 Exchangeable Notes due January 31, 2025
Debt Instrument [Line Items]
Exchangeable Notes	51,588	$ 51,588
Exchangeable Notes, Accrued Interest	5,058	4,246
September 2020 $1,000 Exchangeable Notes due January 31, 2025
Debt Instrument [Line Items]
Exchangeable Notes	220	220
Exchangeable Notes, Accrued Interest	20	12
Conversion of $1,000 Exchangeable Notes due January 31, 2025
Debt Instrument [Line Items]
Exchangeable Notes, Conversion	(39,201)	(39,201)
Exchangeable Notes, Accrued Interest Write off	(2,697)	(2,697)
2025 Exchangeable Notes
Debt Instrument [Line Items]
Exchangeable Notes	12,607	12,607
Unamortized discount and debt issuance costs	(4,894)	(7,238)
Exchangeable Notes, net	7,713	5,369
Exchangeable Notes, Accrued Interest	$ 2,381	$ 1,561

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Debt - Summary of Balances of Exchangeable Notes (Parenthetical) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
January 2020 $1,000 Exchangeable Notes due January 31, 2025
Debt Instrument [Line Items]
Debt instrument price per unit	$ 1,000	$ 1,000
Debt instrument interest rate	6.50%	6.50%
Debt instrument maturity date	Jan. 31, 2025	Jan. 31, 2025
September 2020 $1,000 Exchangeable Notes due January 31, 2025
Debt Instrument [Line Items]
Debt instrument price per unit	$ 1,000	$ 1,000
Debt instrument interest rate	6.50%	6.50%
Debt instrument maturity date	Jan. 31, 2025
Conversion of $1,000 Exchangeable Notes due January 31, 2025
Debt Instrument [Line Items]
Debt instrument price per unit	$ 1,000	$ 1,000
Debt instrument interest rate	6.50%	6.50%
Debt instrument maturity date	Jan. 31, 2025	Jan. 31, 2025

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Debt - Schedule of Principal Payments on Outstanding Debt, Including Principal Amounts owed to RLN Holders (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Debt Disclosure [Abstract]
2025	$ 12,607
Thereafter	104
Total	$ 12,711

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Royalty-Linked Notes - Additional Information (Details) - Royalty-Linked Notes			1 Months Ended	12 Months Ended
	Sep. 08, 2020 Debtinstrument	Jan. 21, 2020 USD ($) Debtinstrument	Jan. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) UsdRln
Debt Instrument [Line Items]
Debt instrument outstanding portion | UsdRln				0.04
Debt instrument maturity date				Dec. 31, 2045
Aggregate amount payable per unit				$ 160.00
Debt instrument, aggregate potential payment capped rate				4,000
Interest expense			$ 1,024,000
Sulopenem
Debt Instrument [Line Items]
Debt discounts		$ 1,239,000
Estimated effective interest rate			31.70%
Private Placement
Debt Instrument [Line Items]
Number of debt instruments issued | Debtinstrument		2,579,400
Rights Offering
Debt Instrument [Line Items]
Number of debt instruments issued | Debtinstrument	11,000

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Royalty Linked Notes - Summary of Royalty-Linked Notes (Details) - USD ($) $ in Thousands	23 Months Ended	35 Months Ended
	Dec. 31, 2021	Dec. 31, 2022
Royalty Linked Notes [Abstract]
Total liability related to the sale of future royalties, on inception	$ 10,990	$ 10,990
Liability related to the sale of future royalties, arising from the Rights Offering	51	51
Amortization of discount and debt issuance costs	3,666	3,666
Adjustments to fair value	3,261	3,665
Total liability related to the sale of future royalties	17,968	18,372
Long-term Portion	$ 17,968	$ 18,372

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Shareholders' Equity / (Deficit) - Additional Information (Details)													1 Months Ended	12 Months Ended	23 Months Ended
	Oct. 17, 2022 USD ($)	Oct. 07, 2022 USD ($) $ / shares	Feb. 12, 2021 $ / shares shares	Feb. 10, 2021 USD ($) $ / shares shares	Feb. 09, 2021 USD ($) $ / shares shares	Feb. 08, 2021 $ / shares shares	Feb. 03, 2021 $ / shares shares	Oct. 31, 2020 $ / shares shares	Oct. 27, 2020 $ / shares shares	Jul. 02, 2020 $ / shares shares	Jun. 05, 2020 $ / shares shares	Jun. 03, 2020 $ / shares shares	Jun. 30, 2020 $ / shares shares	Dec. 31, 2022 USD ($) Vote $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Aug. 17, 2022 $ / shares	Dec. 31, 2021 $ / shares shares	Jan. 28, 2021 $ / shares shares	Apr. 27, 2018 $ / shares shares
Class Of Stock [Line Items]
Increase to authorized ordinary shares																		10,000,000
Ordinary shares, par value | $ / shares														$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Ordinary shares, shares authorized														20,000,000	20,000,000		20,000,000
Number of vote per common share | Vote														1
Common stock rights and preferences														The holders of ordinary shares currently have no preemptive or other subscription rights, and there are no redemption or sinking fund provisions with respect to such shares.
Authorized amount for sale of stock | $	$ 100,000,000.0
Ordinary shares, shares issued														12,598,641	12,598,641		12,185,019
Number of warrants to purchase ordinary shares														25,333	25,333
Proceeds from warrants connected to registered direct offerings | $														$ 546,000
Undesignated preferred shares, par value | $ / shares														$ 0.01	$ 0.01		$ 0.01
Undesignated preferred shares, authorized														100,000,000	100,000,000		100,000,000
Undesignated preferred shares issued														0	0		0
Sales Agreement With H.C. Wainwright
Class Of Stock [Line Items]
Ordinary shares, par value | $ / shares		$ 0.01
Maximum | Sales Agreement With H.C. Wainwright
Class Of Stock [Line Items]
May offer and sell ordinary shares for aggregate gross sales proceeds | $		$ 16,000,000.0
Private Placement | Securities Purchase Agreement
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares											13,868
Warrants to purchase ordinary shares, exercise price | $ / shares											$ 31.5465	$ 24.30
Warrants expiry date												Dec. 05, 2025
Percentage of ordinary shares issued to purchase warrants											7.00%
Private Placement | Securities Purchase Agreement | Maximum
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares												99,057
Private Placement | June 30 SPA
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares										15,739				84,317	84,317
Warrants to purchase ordinary shares, exercise price | $ / shares										$ 27.7965			$ 21.30
Warrants expiry date										Jun. 30, 2025			Jan. 02, 2026
Percentage of ordinary shares issued to purchase warrants										7.00%
Proceeds from exercise of warrants related to registered direct offering | $														$ 1,796,000
Private Placement | June 30 SPA | Maximum
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares													112,422
October Offering
Class Of Stock [Line Items]
Proceeds from registered direct offerings, net of transaction costs | $														$ 13,885,000
Number of warrants to purchase ordinary shares								125,641						1,392,701	1,392,701
Warrants to purchase ordinary shares, exercise price | $ / shares								$ 12.1875	$ 9.75
Warrants expiry date								Oct. 22, 2025	Oct. 27, 2025
Percentage of ordinary shares issued to purchase warrants								7.00%
October Offering | Maximum
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares									1,346,153
February Underwritten Offering
Class Of Stock [Line Items]
Offering closing date				Feb. 10, 2021		Feb. 08, 2021
Additional ordinary shares that can be purchased by underwriter				347,826
Warrants to purchase ordinary shares, exercise price | $ / shares				$ 21.5625		$ 21.5625
Warrants expiry date				Feb. 03, 2026		Feb. 03, 2026
Percentage of ordinary shares issued to purchase warrants				7.00%		7.00%
February Underwritten Offering | Underwriting Agreement
Class Of Stock [Line Items]
Ordinary shares, par value | $ / shares							$ 0.01
Ordinary shares, shares issued							2,318,840
Offering closing date							Feb. 08, 2021
February Underwritten Offering | Pursuant to the Underwriting Agreement
Class Of Stock [Line Items]
Ordinary shares, shares issued				2,666,666
Additional ordinary shares that can be purchased by underwriter				347,826
Aggregate gross proceeds from ordinary shares | $				$ 46,000,000
Proceeds from registered direct offerings, net of transaction costs | $				$ 42,119,000
February Underwritten Offering | Maximum
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares				24,347		162,318
February 2021 Underwritten Offering | Underwriting Agreement
Class Of Stock [Line Items]
Offering price per share | $ / shares							$ 17.25
At-the-market Agreement
Class Of Stock [Line Items]
Number of ordinary shares sold														356,933
Offering price per share | $ / shares														$ 1.25	$ 1.25
Proceeds from registered direct offerings, net of transaction costs | $														$ 400,000
February Registered Direct Offering
Class Of Stock [Line Items]
Ordinary shares, par value | $ / shares					$ 0.01
Ordinary shares, shares issued					1,166,666
Offering price per share | $ / shares					$ 30.00
Offering closing date			Feb. 12, 2021		Feb. 12, 2021
Aggregate gross proceeds from ordinary shares | $					$ 35,000,000
Proceeds from registered direct offerings, net of transaction costs | $					$ 32,235,000
Warrants to purchase ordinary shares, exercise price | $ / shares			$ 37.50
Warrants expiry date			Feb. 09, 2026
Percentage of ordinary shares issued to purchase warrants			7.00%
February Registered Direct Offering | Maximum
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares			81,666
Warrants to Purchase 19,890 Ordinary Shares
Class Of Stock [Line Items]
Warrants expiry date														Apr. 27, 2028
Series B Convertible Preferred Shares | Silicon Valley Bank and Life Sciences Fund II LLC
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares														19,890	19,890				19,890
Warrants to purchase ordinary shares, exercise price | $ / shares														$ 282.75	$ 282.75				$ 282.75
Undesignated Preferred Shares
Class Of Stock [Line Items]
Undesignated preferred shares, par value | $ / shares														$ 0.01	$ 0.01
Undesignated preferred shares, authorized														100,000,000	100,000,000
Undesignated preferred shares issued														0	0		0
Ordinary Shares
Class Of Stock [Line Items]
Number of warrants to purchase ordinary shares														1,326	1,326				1,326
Exchangeable Notes
Class Of Stock [Line Items]
Ordinary shares, shares issued														3,592,555	3,592,555
Aggregate principal amount of exchangeable notes | $															$ 39,201,000
Aggregate principal amount | $														$ 12,607,000	12,607,000
Exchangeable Notes | Private Placement
Class Of Stock [Line Items]
Aggregate principal amount of exchangeable notes | $															$ 39,201,000

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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands									12 Months Ended
	Jul. 07, 2022	Nov. 24, 2021	Jun. 22, 2021	Jun. 10, 2020	Feb. 14, 2020	Dec. 31, 2018	Dec. 05, 2018	Nov. 18, 2015	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 23, 2021	Dec. 31, 2019	Mar. 14, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Cancelled									(906,800)
Cancellation Of Share Option									$ 17,350
Share options granted									197,085	1,028,090	4,322
Weighted average grant date fair value, options granted									$ 2.39	$ 23.67	$ 19.17
Employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate based on estimate of U.S. treasury yield									7 years
Employees and Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense recognized									$ 3,580	$ 3,779	$ 1,136
Vesting period									1 year 4 months 28 days	3 years 5 months 26 days	1 year 5 months 19 days
Share options granted									197,085	1,028,090	4,322
Unvested employee options outstanding									296,199	1,033,820	17,778
Unamortized compensation expense share options									$ 929	$ 21,521	$ 970
Restricted Share Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date fair value									$ 9.87	$ 19.16			$ 105.21
Expense recognized									$ 1,178	$ 960	$ 63
Number of shares, granted/awarded									66,398	123,017
Unamortized compensation expense									$ 434	$ 1,416
Stock-based compensation expense, expected weighted average period for recognition									10 months 17 days	1 year 10 months 20 days
Restricted Share Units (RSUs) | Employees and Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted/awarded									66,398	123,017	0
Restricted Share Units (RSUs) | Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period									1 year
Performance RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date fair value											$ 33.18		$ 123.15
Expense recognized										$ (0)	$ 1,560
Number of shares, granted/awarded									0	0	71,927
Unamortized compensation expense											$ 152
Stock-based compensation expense, expected weighted average period for recognition											2 months 12 days
Performance RSUs | Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted/awarded											71,927
Restricted Ordinary Shares, Options and Restricted Share Units and Performance Restricted Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period									1 year 3 months 10 days	3 years 3 months 25 days	9 months 18 days
Unamortized compensation expense									$ 1,363	$ 22,937	$ 1,122
2015 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized								14,895
Number of ordinary shares available for issuance								29,535
Increase in number of ordinary shares available for issuance								14,640
2018 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized												1,295,819		67,897
Increase in number of ordinary shares available to be granted, percentage					4.00%		4.00%
Increase in number of ordinary shares available to be granted			1,000,000	150,000	39,650	38,272
2018 Plan | Restricted Share Units (RSUs) | Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period									2 years
2021 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in number of ordinary shares available to be granted		333,333
2021 Inducement Plan | Restricted Share Units (RSUs) | Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period									4 years
2015 Plan, 2018 Plan and 2021 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Cancelled									(906,800)
Share options granted									197,085	1,028,090	4,322
2015 Plan, 2018 Plan and 2021 Inducement Plan | Employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share option granted term									10 years
Vesting period									4 years
Vesting rights									The vesting requirement is conditioned upon a grantee’s continued service with the Company during the vesting period. Once vested, all awards are exercisable from the date of grant until they expire. The option grants are non-transferable. Vested options generally remain exercisable for 90 days subsequent to the termination of the option holder’s service with the Company. In the event of an option holder’s disability or death while employed by or providing service to the Company, the exercisable period extends to twelve months or eighteen months, respectively.
2015 Plan, 2018 Plan and 2021 Inducement Plan | Restricted Share Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted/awarded									66,398	123,017
Two Thousand Twenty One Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share options granted									6,332	120,000
Two Thousand Twenty One Inducement Plan | Restricted Share Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted/awarded										33,333
Amended And Restated 2018 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Cancelled	906,800
Amended And Restated 2018 Equity Incentive Plan [Member] | Employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cancellation Of Share Option									$ 17,350

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Share-Based Compensation - Schedule of Assumptions Used to Determine Grant Date Fair Value of Employee and Director Options Granted (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility, minimum	100.00%	120.00%	90.30%
Volatility, maximum	130.00%	140.00%	99.50%
Dividend rate	0.00%	0.00%	0.00%
Risk-free interest rate, minimum	1.90%	0.90%	0.18%
Risk-free interest rate, maximum	3.96%	1.42%	0.78%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term in years	5 years 6 months	5 years 6 months	5 years 6 months
Share price	$ 0.81	$ 0.48	$ 1.68
Fair value of option on grant date	$ 0.64	$ 0.45	$ 1.27
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term in years	6 years 3 months	6 years 3 months	6 years 3 months
Share price	$ 6.72	$ 2.01	$ 2.03
Fair value of option on grant date	$ 5.95	$ 1.75	$ 1.52

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Share-Based Compensation - Summary of Stock Option Activity (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Options outstanding Beginning Balance	1,068,639	63,431	76,636
Number of Shares, Granted	197,085	1,028,090	4,322
Number of Shares, Forfeited	(3,333)		(9,260)
Number of Shares, Cancelled	(906,800)
Number of Shares, Expired		(22,882)	(8,267)
Number of Shares, Options outstanding Ending Balance	355,591	1,068,639	63,431
2015 Plan and 2018 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Options outstanding Beginning Balance	948,639	63,431	76,636
Number of Shares, Granted	190,753	908,090	4,322
Number of Shares, Forfeited			(9,260)
Number of Shares, Cancelled	(906,800)
Number of Shares, Expired		(22,882)	(8,267)
Number of Shares, Options outstanding Ending Balance	232,592	948,639	63,431
Two Thousand Twenty One Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Options outstanding Beginning Balance	120,000
Number of Shares, Granted	6,332	120,000
Number of Shares, Forfeited	(3,333)
Number of Shares, Options outstanding Ending Balance	122,999	120,000
2015 Plan, 2018 Plan and 2021 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Options outstanding Beginning Balance	1,068,639	63,431
Number of Shares, Granted	197,085	1,028,090	4,322
Number of Shares, Forfeited	(3,333)		(9,260)
Number of Shares, Cancelled	(906,800)
Number of Shares, Expired		(22,882)	(8,267)
Number of Shares, Options outstanding Ending Balance	355,591	1,068,639	63,431

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Share-Based Compensation - Summary of Number of Options Outstanding and Weighted-average Exercise Price (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Compensation Related Costs [Abstract]
Number of Shares, Options outstanding Beginning Balance	1,068,639	63,431	76,636
Number of Shares, Granted	197,085	1,028,090	4,322
Number of Shares, Forfeited	(3,333)		(9,260)
Number of Shares, Cancelled	(906,800)
Number of Shares, Expired		(22,882)	(8,267)
Number of Shares, Options outstanding Ending Balance	355,591	1,068,639	63,431	76,636
Number of Shares, Exercisable at December 31, 2020	59,392
Weighted Average Exercise Price, Options outstanding Beginning Balance	$ 30.12	$ 110.40	$ 118.79
Weighted Average Exercise Price, Granted	2.88	27.13	25.36
Weighted Average Exercise Price, Forfeited	6.15		129.07
Weighted Average Exercise Price, Cancelled	33.16
Weighted Average Exercise Price, Expired		118.49	122.83
Weighted Average Exercise Price, Options outstanding Ending Balance	7.49	$ 30.12	$ 110.40	$ 118.79
Weighted Average Exercise Price, Exercisable at December 31, 2020	$ 22.21
Weighted Average Remaining Contractual Life in Years, Options outstanding	9 years 1 month 13 days	9 years 5 months 1 day	5 years 4 months 28 days	8 years 7 months 2 days
Weighted Average Remaining Contractual Life in Years, Exercisable at December 31, 2019	8 years 1 month 2 days
Aggregate Intrinsic Value, Options outstanding			$ 254
Aggregate Intrinsic Value, Options outstanding				$ 254

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Share-Based Compensation - Summary of Number of RSUs Granted (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance			2,090
Restricted Share Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance	119,017
Number of Shares, Granted	66,398	123,017
Number of Shares, Shares vested	(56,687)	(4,000)	(1,710)
Number of Shares, Forfeited			(380)
Number of Shares, RSUs outstanding Ending Balance	128,728	119,017
Restricted Share Units (RSUs) | 2015 Plan and 2018 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance	85,684		2,090
Number of Shares, Granted	66,398	89,684
Number of Shares, Shares vested	(48,353)	(4,000)	(1,710)
Number of Shares, Forfeited			(380)
Number of Shares, RSUs outstanding Ending Balance	103,729	85,684
Restricted Share Units (RSUs) | Two Thousand Twenty One Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance	33,333
Number of Shares, Granted		33,333
Number of Shares, Shares vested	(8,334)
Number of Shares, RSUs outstanding Ending Balance	24,999	33,333
Restricted Share Units (RSUs) | 2015 Plan, 2018 Plan and 2021 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance	119,017		2,090
Number of Shares, Granted	66,398	123,017
Number of Shares, Shares vested	(56,687)	(4,000)	(1,710)
Number of Shares, Forfeited			(380)
Number of Shares, RSUs outstanding Ending Balance	128,728	119,017

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Share-Based Compensation - Summary of Number of RSUs Granted and Weighted-average Grant Date Fair Value of RSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance			2,090
Restricted Share Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance	119,017
Number of Shares, Granted	66,398	123,017
Number of Shares, Shares vested	(56,687)	(4,000)	(1,710)
Number of Shares, Forfeited			(380)
Number of Shares, RSUs outstanding Ending Balance	128,728	119,017
Weighted average grant date fair value per share, RSUs outstanding Beginning Balance	$ 19.16		$ 105.21
Weighted average grant date fair value per share, Granted	2.91	$ 19.32
Weighted average grant date fair value per share, Shares Vested	21.23	24.00	105.21
Weighted average grant date fair value per share, Forfeited			$ 105.21
Weighted average grant date fair value per share, RSUs outstanding Ending Balance	$ 9.87	$ 19.16

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Share-Based Compensation - Summary of Number of Performance RSUs Granted and Weighted-average Grant Date Fair Value of PSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance			2,090
Performance RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, RSUs outstanding Beginning Balance		65,527	3,326
Number of Shares, Granted	0	0	71,927
Number of Shares, Shares vested		(41,961)
Number of Shares, Expired		1,733
Number of Shares, Forfeited		(21,833)	(9,726)
Number of Shares, RSUs outstanding Ending Balance			65,527
Weighted average grant date fair value per share, RSUs outstanding Beginning Balance		$ 33.18	$ 123.15
Weighted average grant date fair value per share, Granted			30.71
Weighted average grant date fair value per share, Shares Vested		30.90
Weighted average grant date fair value per share, Expired		29.85
Weighted average grant date fair value per share, Forfeited		$ 123.15	45.75
Weighted average grant date fair value per share, RSUs outstanding Ending Balance			$ 33.18

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Share-Based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Research and Development Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 1,396	$ 1,322	$ 754
General and Administrative Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 3,362	$ 2,997	$ 2,005

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Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Aug. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax [Line Items]
Income tax benefits		$ 0	$ 0	$ 0
IRA of 2022 alternative minimum tax percentage	15.00%
IRA of 2022 impact on excise tax percentage	1.00%
Ireland
Income Tax [Line Items]
Net operating loss carryforwards		$ 36,059,000	$ 33,218,000	$ 30,261,000

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Income Taxes - Summary of Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current
U.S.	$ 301	$ 705	$ 743
Total Current	301	705	743
Deferred
Income Tax Provision	$ 301	$ 705	$ 743

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Income Taxes - Summary of Components of Income (Loss) Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
U.S.	$ (13,701)	$ (34)	$ 696
Ireland	(30,432)	(90,825)	(51,959)
Loss before income taxes	$ (44,133)	$ (90,859)	$ (51,263)

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Income Taxes - Summary of Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax [Line Items]
Impact of U.S. tax rate, Percentage	4.71%	0.01%	(0.20%)
Impact of valuation allowance, Percentage	(5.30%)	(3.64%)	(6.47%)
Research and development tax credit, Percentage	0.00%	(0.00%)	0.14%
Adjustments for current tax of prior periods, Percentage	(4.19%)	0.14%	(1.94%)
Cancellation of share options, Percentage	(9.02%)	0.00%	0.00%
Fair value movements on derivative financial instruments, Percentage	1.55%	(8.37%)	(4.34%)
Other, net, Percentage	(0.92%)	(1.42%)	(1.13%)
Effective tax rate, Percentage	(0.68%)	(0.78%)	(1.44%)
Statutory rate, Amount	$ (5,517)	$ (11,357)	$ (6,408)
Impact of U.S. tax rate, Amount	(2,080)	(5)	105
Impact of valuation allowance, Amount	2,341	3,304	3,319
Research and development tax credit, Amount			(71)
Adjustments for current tax of prior periods, Amount	1,851	(131)	995
Cancellation of share options, Amount	3,983
Fair value movements on derivative financial instruments, Amount	(682)	7,603	2,227
Other, net, Amount	405	1,292	577
Income Tax Provision	$ 301	$ 705	$ 743
Ireland
Income Tax [Line Items]
Statutory rate, Percentage	12.50%	12.50%	12.50%

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Income Taxes - Summary of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Share-based compensation	$ 438	$ 822	$ 650
Depreciation	42	127	31
Net operating loss carryforwards	36,059	33,218	30,261
Other	11	120	41
Valuation allowance	$ (36,528)	$ (34,287)	$ (30,983)

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Income Taxes - Summary of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Balance at January 1	$ 3,300	$ 3,024
(Decrease) / Increase in tax positions	(456)	276
Balance at December 31	$ 2,844	$ 3,300

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Commitment and Contingencies - Additional Information (Details)			12 Months Ended
	Sep. 08, 2020 Debtinstrument	Jan. 21, 2020 Debtinstrument	Dec. 31, 2022 USD ($) UsdRln	Nov. 18, 2015 USD ($)
Royalty-Linked Notes
Other Commitments [Line Items]
Debt instrument outstanding portion | UsdRln			0.04
Debt instrument maturity date			Dec. 31, 2045
Debt instrument, aggregate potential payment capped rate			4,000
Pfizer License Agreement | Royalty-Linked Notes
Other Commitments [Line Items]
Debt instrument outstanding portion | UsdRln			0.04
Debt instrument maturity date			Dec. 31, 2045
Debt instrument price per unit			$ 160.00
Debt instrument, aggregate potential payment capped rate			4,000
Pfizer License Agreement | Royalty-Linked Notes | Private Placement
Other Commitments [Line Items]
Number of debt instruments within each notes | Debtinstrument		2,579,400
Pfizer License Agreement | Royalty-Linked Notes | Rights Offering
Other Commitments [Line Items]
Number of debt instruments within each notes | Debtinstrument	11,000
Pfizer License Agreement | Minimum
Other Commitments [Line Items]
Potential future regulatory milestone and sales milestone payments upon achievement of net sales				$ 250,000,000.0
Pfizer License Agreement | Maximum
Other Commitments [Line Items]
Potential future regulatory milestone and sales milestone payments upon achievement of net sales				$ 1,000,000,000.0

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Condensed Consolidating Financial Statements - Additional Information (Details)	Sep. 08, 2020 USD ($) Debtinstrument	Jan. 21, 2020 USD ($) Debtinstrument	Dec. 31, 2022 USD ($)
Iterum Therapeutics Bermuda Limited
Condensed Financial Statements Captions [Line Items]
Ownership percentage		100.00%
Subsidiary Guarantors
Condensed Financial Statements Captions [Line Items]
Ownership percentage		100.00%
2025 Exchangeable Notes
Condensed Financial Statements Captions [Line Items]
Aggregate principal amount		$ 9,891,000	$ 12,607,000,000
Private Placement | 2025 Exchangeable Notes
Condensed Financial Statements Captions [Line Items]
Aggregate principal amount		51,588,000
Debt instrument price per unit	$ 1,000	1,000
Private Placement | RLNs
Condensed Financial Statements Captions [Line Items]
Aggregate principal amount		$ 103,000
Number of debt instruments within each notes | Debtinstrument	50	50
Rights Offering | 2025 Exchangeable Notes
Condensed Financial Statements Captions [Line Items]
Aggregate principal amount	$ 220,000
Rights Offering | RLNs
Condensed Financial Statements Captions [Line Items]
Aggregate principal amount	$ 440