UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

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

For the fiscal year ended December 31, 2023

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

For The Transition Period FromTo

Commission file number: 001-40523

ELEVATION ONCOLOGY, INC.

(Exact name of registrant as specified in its charter)



Delaware	84-1771427
(State of Other Jurisdiction of incorporation or Organization)	(I.R.S. Employer Identification No.)
101 Federal Street, Suite 1900, Boston, Massachusetts	02110
(Address of principal executive offices)	(Zip code)

Registrant’s telephone number, including area code: (716) 371-1125

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



		Name Of Each Exchange
Title of Each Class	Trading Symbol(s)	On Which Registered
Common stock, par value $0.0001 per share	ELEV	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 Section 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 (§232.0405 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, a 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. ☐

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 Exchange Act). Yes ☐ No ☒

The aggregate market value of Common Stock held by non-affiliates of the registrant computed by reference to the price of the registrant’s Common Stock as of June 30, 2023, the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $52.8 million (based on the last reported sale price on the Nasdaq Global Select Market as of such date). As of March 1, 2024, there were 48,651,115 shares of the registrant’s common stock, par value $0.0001 per share, outstanding.

Documents Incorporated by Reference

The registrant intends to file a definitive proxy statement pursuant to Regulation 14A relating to the 2024 Annual Meeting of Stockholders within 120 days of the end of the registrant’s fiscal year ended December 31, 2023. Portions of such definitive proxy statement are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.

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Throughout this Annual Report on Form 10-K (the “Annual Report”), the “Company”, “Elevation”, “Elevation Oncology”, “we”, “us”, and “our”, except where the context requires otherwise, refer to Elevation Oncology, Inc. and its consolidated subsidiary, and “our Board of Directors” refers to the Board of Directors of Elevation Oncology, Inc.

Special Note Regarding Forward-Looking Statements

This Annual Report contains forward-looking statements. In some cases, you can identify forward-looking statements by terms such as “believe,” “may,” “will,” “potentially,” “estimate,” “continue,” “anticipate,” “intend,” “could,” “would,” “project,” “plan,” “expect,” “predict,” “potential” and similar expressions that convey uncertainty of future events or outcomes, although not all forward-looking statements contain these words. These forward-looking statements are subject to a number of risks, uncertainties and assumptions, including those described in “Risk factors” and elsewhere in this filing. Moreover, we operate in a 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.

The forward-looking statements in this Annual Report include, among other things, statements about:

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our ability to develop, obtain regulatory approval and commercialize EO-3021 and our other product candidates;

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the timing of our preclinical studies and clinical trials for EO-3021 and our other product candidates;

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our ability to establish and maintain collaborations, including with CSPC Pharmaceutical Group Limited (collectively with its affiliates, “CSPC”), our licensor and partner for EO-3021;

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estimates of our addressable market and market growth;

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our expectations regarding demand for, and market acceptance of, EO-3021 and our other product candidates;

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our ability to compete effectively with existing competitors and new market entrants;

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the potential effects of extensive government regulations relating to our industry;

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our ability to obtain, maintain, and protect and enforce intellectual property and proprietary rights;

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our ability to operate our business without infringing, misappropriating or otherwise violating the intellectual property rights and proprietary technology of third parties;

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our ability to maintain secure, efficient and uninterrupted operation of our information technology systems from security breaches, cyberattacks, loss or leakage of data and other disruptions;

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our ability to expand our pipeline of product candidates;

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our ability to attract and retain key management and technical personnel;

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general economic, market and geopolitical conditions, including fluctuating interest rates, market volatility and inflation, and the impact of geopolitical tensions with China and ongoing regional military conflicts; and

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our expectations regarding expenses, future revenue, capital requirements, and our needs for additional financing.

The forward-looking statements made in this filing relate only to events or information as of the date on which the statements are made in this Annual Report. 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 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

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PART I

Item 1. Business

Overview

We are an innovative oncology company focused on the discovery and development of selective cancer therapies to treat patients across a range of solid tumors with significant unmet medical needs. We are leveraging our antibody-drug conjugate (“ADC”) expertise to advance a novel pipeline, initially targeting two validated targets in oncology, Claudin 18.2 and HER3.

Our lead product candidate, EO-3021 (also known as SYSA1801 or CPO102), is an ADC designed to target Claudin 18.2 and is currently being evaluated in a Phase 1 clinical trial in patients with advanced, unresectable or metastatic solid tumors likely to express Claudin 18.2, including gastric, gastroesophageal junction, pancreatic or esophageal cancers. We have an active Investigational New Drug application (“IND”) for EO-3021 with the U.S. Food and Drug Administration (the “FDA”), and in August 2023, we announced that the first patient had been dosed in our Phase 1 clinical trial of EO-3021. In February 2024, we announced that the first patient had been dosed in Japan. We plan to provide an update from our ongoing Phase 1 trial in mid-2024, with additional data expected in the first half of 2025. In addition to our monotherapy approach, we plan to evaluate EO-3021 in combination with both immunotherapy and targeted agents, with further details on our planned Phase 1 combination study expected to be shared in the first half of 2024. EO-3021 was granted orphan drug designation by the FDA for the treatment of gastric cancer (including cancer of gastroesophageal junction) in November 2020 and for the treatment of pancreatic cancer in May 2021.

We currently retain worldwide development and commercialization rights for EO-3021 outside Greater China (the People’s Republic of China, Hong Kong, Macau and Taiwan).

Our second program is an ADC designed to target HER3, which is overexpressed across solid tumors and often associated with poor outcomes. We are currently evaluating our HER3-ADC program and plan to nominate a development candidate in 2024.

Our pipeline is shown below:

We have an experienced management team with expertise in ADC and oncology drug discovery and development, as well as a proven track record to discover and develop novel cancer therapies for patients with significant unmet medical needs. Additionally, we are backed by a group of renowned scientific advisors and partners that bring clinical and operational expertise to help optimize execution.

In January 2023, we announced that we paused further investment in the clinical development of seribantumab, an anti-HER3 monoclonal antibody (“mAb”) for solid tumors driven by neuregulin-1 (“NRG1”) fusions, a type of genomic alteration and oncogenic driver in solid tumors. As a result, further enrollment in our Phase 2 CRESTONE clinical trial evaluating seribantumab was paused. We intend to pursue further clinical development of seribantumab only in collaboration with a partner.

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Our Strategy

Our goal is to deliver safe and effective selective cancer therapies for patient populations with significant unmet medical needs. Key elements of our strategy include:

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Rapidly advance our lead product candidate, EO-3021, an ADC targeting Claudin 18.2, through clinical development. We are currently evaluating EO-3021 in a Phase 1 clinical trial and plan to provide an update from this trial in mid-2024, with additional data expected in the first half of 2025. Additionally, we plan to evaluate EO-3021 in combination with both immunotherapy and targeted agents, with further details on our planned Phase 1 combination study expected to be shared in the first half of 2024.

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Rapidly identify and advance our second program, an ADC targeting HER3, through preclinical development. We are currently evaluating our HER3-ADC program and plan to nominate a development candidate in 2024.

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Seek opportunities to expand our pipeline of selective cancer drug candidates and targets. We intend to continue to seek opportunities to expand our pipeline with complementary drug candidates, including by leveraging partnerships and our own internal expertise and capabilities to potentially accelerate the identification of additional actionable selective cancer targets. If we identify targets that we deem to have high potential to address unmet medical needs, we may develop, in-license or acquire assets with therapeutic potential against those identified selective cancer targets.

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Evaluate strategic opportunities to potentially accelerate development timelines and enhance the commercial potential of our product candidates globally. We intend to leverage our ADC expertise to advance a novel pipeline. We plan to commercialize our product candidates in key markets, either alone or with strategic partners, and maximize the worldwide commercial potential of our programs.

Our Lead Product Candidate: EO-3021

EO-3021 is an ADC designed to target Claudin 18.2, which can selectively deliver a cytotoxic payload directly to cancer cells expressing Claudin 18.2. Claudin 18.2 is overexpressed in several types of cancers, including gastric, esophageal, pancreatic, ovarian and lung, which we believe represents a significant market opportunity. There are currently no approved therapies targeting Claudin 18.2, and we believe EO-3021 could potentially address a high unmet medical need and play a transformative role across several solid tumor types.

We believe EO-3021 has the potential to be a differentiated anti-Claudin 18.2 product candidate, due in part to: (i) its site-specific conjugation at glutamine (Q295), which has been shown to increase ADC stability and minimize free payload compared with cysteine conjugation, potentially driving improved outcomes for patients, and (ii) its potential ability to target tumors with low, medium or high levels of Claudin 18.2 expression, which could potentially result in a broader target population and greater commercial opportunity compared with other approaches.

In July 2022, we licensed the worldwide exclusive rights, outside Greater China, from a subsidiary of CSPC Pharmaceutical Group Limited (collectively with its affiliates, “CSPC”) to develop and commercialize products containing EO-3021 for the treatment of cancer.

We have an active IND for EO-3021 with the FDA, and in August 2023, we announced that the first patient had been dosed in our Phase 1 clinical trial of EO-3021. In February 2024, we announced that the first patient had been dosed in Japan. We plan to provide an update from our ongoing Phase 1 trial in mid-2024, with additional data expected in the first half of 2025. In addition to our monotherapy approach, we plan to evaluate EO-3021 in combination with both immunotherapy and targeted agents, with further details on our planned Phase 1 combination study expected to be shared in the first half of 2024.

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In June 2023, we and CSPC announced initial clinical data for SYSA1801 (EO-3021) from CSPC’s ongoing Phase 1 clinical trial in China. These data were presented at the American Society of Clinical Oncology 2023 Annual Meeting (“ASCO 2023”). Key findings included:

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As of the data cutoff date of November 5, 2022, 33 patients with resistant/refractory solid tumors that expressed Claudin 18.2 were enrolled.

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Patients received 0.5 mg/kg to 3 mg/kg of SYSA1801 (EO-3021) administered intravenously (“IV”) every 3 weeks (“Q3W”) as part of the dose escalation (n=17) portion of the study; in the dose expansion portion of the study, patients (n=16) were treated at effective doses (2.0 mg/kg IV Q3W and 2.5 mg/kg IV Q3W).

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26 patients (78.8%) had gastric cancer; 7 patients (21.2%) had pancreatic cancer.

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11 patients (33.3%) had been pretreated with ≥3 prior lines of therapy.

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21 patients (gastric cancer n=17; pancreatic cancer n=4) were evaluable for efficacy per RECIST v1.1.

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In gastric cancer, the objective response rate (“ORR”) was 47.1% (8 partial responses (“PRs”), including 4 confirmed PRs) and the disease control rate (“DCR”) was 64.7%, including three patients with stable disease (“SD”).

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The overall ORR was 38.1% (8 PRs, including 4 confirmed PRs) and DCR was 57.1% (including 4 SDs).

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Of the 33 patients enrolled at the time of data cutoff, treatment-related adverse events (“TRAEs”) of any grade occurred in 25 patients (75.8%), including eight (24.2%) TRAEs of ≥Grade 3.

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The most common TRAEs (occurring in >20% of patients) were nausea (42.4%), vomiting (36.4%), dry eye syndrome (21.2%) and anemia (21.2%).

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Two dose-limiting toxicities of Grade 3 nausea and vomiting occurred at the 3 mg/kg IV Q3W dose.

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No treatment-related deaths were reported.

In April 2023, we presented preclinical proof-of-concept data and a clinical case study for EO-3021 at the American Association for Cancer Research Annual Meeting 2023 (“AACR 2023”). The clinical case study was from the ongoing Phase 1 clinical trial being conducted in China by CSPC and involved a patient with metastatic gastric cancer who achieved a confirmed partial response on treatment with EO-3021.

Key findings from the preclinical study included:

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EO-3021 retains antibody-dependent cell-mediated cytotoxicity and complement dependent cytotoxicity.

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EO-3021 reduction in cell viability requires Claudin 18.2 expression in vitro with no effects seen on Claudin 18.2-negative cells.

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EO-3021 demonstrated anti-tumor activity in in vivo xenograft models of pancreatic and gastric cancers expressing varying levels of Claudin 18.2.

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A single dose of EO-3021 demonstrated tumor regression across low, medium and high Claudin 18.2-expressing models, with a lower minimal efficacious dose in models with medium and high levels of Claudin 18.2 relative to models with low levels of Claudin 18.2.

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EO-3021 outperformed standard of care chemotherapy in gastric and pancreatic cancer in vivo models.

Key findings from the CSPC clinical case study included:

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The patient was treated with dose level 2, or 1.0 mg/kg EO-3021, IV Q3W for 12 cycles.

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The best overall response, as evaluated per RECIST v1.1, was a confirmed partial response (66.7% maximal tumor reduction).

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Duration of response was approximately 11 months.

Structure and Mechanism of Action

Claudin 18.2 is a compelling ADC therapeutic target that is part of a family of tight junction membrane proteins. Expression of Claudin 18.2 in normal tissues is restricted to the gastric mucosa and typically has minimal overlap with HER2 or PD-L1 expression. During malignant transformation, the tight junctions may become disrupted, exposing Claudin 18.2 and allowing them to be accessible by Claudin 18.2-targeting agents. Claudin 18.2 is overexpressed in several types of cancers, including gastric, esophageal, pancreatic, ovarian and lung.

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	Estimated Annual New Cancer Cases
Cancer Type	U.S. Incidence (approximate)	Global Incidence (approximate)	Claudin18.2 Expression per Disease Type* (approximate)
Gastric	26,500	1,090,000	77% (adenocarcinoma)
Esophageal	21,500	604,000	78% (adenocarcinoma)
Pancreatic	64,000	496,000	59-80% (pancreatic ductal adenocarcinoma)
Ovarian	20,000	314,000	24% (mucinous)
Lung	238,000	2,207,000	6% (adenocarcinoma)

*	Any level of expression using immunohistochemistry, or IHC (e.g., at least 1% of cells with any staining intensity of Claudin 18.2).

Clinical Validation of the Target and Potential for Broader Patient Population

Based on clinical data reported for other therapeutic agents targeting Claudin 18.2 in various phases of clinical development, including mAb and CAR T-cell approaches, we believe this target has been clinically validated. Whereas both mAb and CAR T-cell anti-Claudin 18.2 approaches have required a substantial portion of tumor cells with moderate-to-high expression of Claudin 18.2 for anti-tumor activity, we believe an ADC approach could potentially target tumors with varying levels of Claudin 18.2 expression, including tumors with low levels of expression. Therefore, EO-3021 could potentially capture a broader patient population and greater commercial opportunity.

Clinical Development Plan

We have an active IND for EO-3021 with the FDA, and in August 2023, we announced that the first patient had been dosed in our Phase 1 clinical trial of EO-3021, which is a dose escalation and expansion trial in patients with solid tumors likely to express Claudin 18.2. In February, we announced that the first patient had been dosed in Japan. In the dose escalation part of our Phase 1 trial, we expect to enroll patients with advanced unresectable or metastatic gastric, gastroesophageal junction (GEJ), esophageal or pancreatic cancer in increasing dose levels, including 1.0, 2.0, 2.5 and 2.9 mg/kg IV Q3W and potentially higher. The primary objective in dose escalation will be to evaluate the safety and tolerability of EO-3021. In the expansion part of our Phase 1 trial, we plan to administer the maximum tolerated dose (MTD) or recommended Phase 2 dose (RP2D) of EO-3021 to patients with gastric or GEJ cancer who have progressed on or after standard therapy or are intolerable for available standard therapy. The primary objective in expansion will be to evaluate preliminary anti-tumor activity of EO-3021. Expression of Claudin 18.2 will not be required for enrollment in our Phase 1 dose escalation and expansion trial; tumor tissue samples will be collected for retrospective biomarker assessment of Claudin 18.2 expression by IHC.

In addition to our monotherapy approach, we plan to evaluate EO-3021 in combination with both immunotherapy and targeted agents. We believe combination therapy will provide an opportunity to deliver better treatment options to patients in first- and second-line settings.

HER3-ADC

Manufacturing

We do not own or operate, and currently have no plans to establish, any manufacturing facilities. We rely, and expect to continue to rely, on third parties for the manufacturing of our product candidates for clinical testing, as well as for commercial manufacturing if any of our product candidates obtain marketing approval. We also rely, and expect to

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continue to rely, on third parties to package, label, store and distribute our investigational product candidates, as well as our commercial products if marketing approval is obtained. We believe that this strategy allows us to maintain a more efficient infrastructure by eliminating the need for us to invest in our own manufacturing facilities, equipment and personnel while also enabling us to focus our expertise and resources on the development of our product candidates.

We expect to purchase any clinical or commercial supply of EO-3021 from CSPC. Until we have completed the first Phase 2 clinical trial for EO-3021 in the United States, CSPC will supply EO-3021 for clinical investigation purposes in the United States as we request, but only to the extent necessary to conduct such clinical trial, at no cost to us.

We generally expect to rely on third parties for the manufacturing of any companion or complementary diagnostics we may develop.

Competition

The pharmaceutical and biotechnology industries are characterized by rapidly advancing technologies, intense competition and a strong emphasis on proprietary products. While we believe that our technology, the expertise of our team, and our development experience and scientific knowledge provide us with competitive advantages, we face increasing competition from many different sources, including pharmaceutical and biotechnology companies, academic institutions, governmental agencies and public and private research institutions. Product candidates that we successfully develop and commercialize may compete with existing therapies and new therapies that may become available in the future.

We compete directly with companies that focus on oncology and companies dedicating their resources to cancer therapies. With the proliferation of new drugs and therapies into oncology, we expect to face increasingly intense competition as new technologies become available and new therapeutic candidates are clinically developed or approved therapies are explored for new indications. Any candidates that we successfully develop and commercialize will compete with existing therapies and new therapies that may become available in the future.

Many of our competitors, either alone or with their collaborators, have significantly greater financial resources and established presence in the market than we do. These competitors also compete with us in recruiting and retaining qualified scientific and management personnel, establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring technologies complementary to, or necessary for, our programs. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. Additional mergers and acquisitions may result in even more resources being concentrated in our competitors.

The key competitive factors affecting the success of all of our product candidates, if approved, are likely to be their efficacy, safety, dosing convenience, price, the effectiveness of companion or complementary diagnostics in guiding the use of related therapeutics, the level of generic competition and the availability of reimbursement from government and other third-party payors.

Our commercial potential could be reduced or eliminated if our competitors develop and commercialize products that are safer or more effective, have fewer or less severe side effects, and are more convenient or less expensive than products that we may develop. Our competitors also may obtain FDA or other regulatory approval for their products more rapidly than we can, which could result in our competitors establishing a strong market position before we are able to enter the market or could otherwise make our development more complicated. We believe the key competitive factors affecting the success of all of our programs are likely to be efficacy, safety and patient convenience. Even if our product candidates achieve marketing approval, they may be priced at a significant premium over competitive products if any have been approved by then.

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modalities, including Astellas Pharma, Beijing Mabworks Biotech, CARsgen Therapeutics, Flame Biosciences, Jiangsu Aosaikang Pharmaceutical, Legend Biotech, NovaRock Biotherapeutics, Shanghai Longyao Biotechnology, Transcenta Holding, Triumvira Immunologics, Zai Lab and others. Development efforts with respect to, and clinical trial results of, these potentially competitive product candidates may be unsuccessful, which could result in a negative perception of product candidates targeting Claudin 18.2 in general, which could in turn negatively impact the regulatory approval process for EO-3021.

We expect that any potential HER3-ADC product candidate will compete against other ADCs targeting HER3. Several such candidates are currently in clinical development, including those of Daiichi Sankyo/Merck (patritumab deruxtecan/HER3-DXd), Duality Biologics (DB-1310), MediLink Therapeutics (Suzhou)/BioNTech (YL202) and SystImmune/Bristol Myers Squibb (BL-B01D1). We may face further competition from companies pursuing the development of product candidates that target HER3 through other modalities, including Hummingbird Bioscience, ISU Abxis, Shanghai Institute of Biologic Products, SystImmune and others. Development efforts with respect to, and clinical trial results of, these potentially competitive product candidates may be unsuccessful, which could result in a negative perception of product candidates targeting HER3 in general, which could in turn negatively impact the regulatory approval process for a potential HER3-ADC product candidate.

License, Asset Purchase and Collaboration Agreements

CSPC License Agreement

In July 2022, we entered into a license agreement (the “CSPC License Agreement”) with CSPC Megalith Biopharmaceutical Co., Ltd., a subsidiary of CSPC Pharmaceutical Group Limited, pursuant to which CSPC granted to us a worldwide exclusive right and license (outside of Greater China) under certain patents identified in the CSPC License Agreement (the “Licensed Patents”) and know-how to develop and commercialize products containing EO-3021 (“Licensed Products”) in the treatment of cancer.

Pursuant to the terms of the CSPC License Agreement, we paid to CSPC a one-time, upfront payment of $27.0 million. CSPC will also be eligible to receive up to $148.0 million in potential development and regulatory milestone payments and up to $1.0 billion in potential commercial milestone payments plus royalties on net sales. During the term of the CSPC License Agreement, we are also required to pay to CSPC (i) royalties ranging from mid-single digits through low double digits on net sales of each Licensed Product and (ii) a percentage of non-royalty sublicense income received by us, up to an aggregate of $50.0 million.

We will purchase Licensed Products for any clinical or commercial supply from CSPC under the terms of a supply agreement. Until we have completed the first Phase 2 clinical trial for the first Licensed Product in the United States, CSPC shall supply EO-3021 for clinical purposes as we request, but only to the extent necessary to conduct such clinical trial, at no cost to us.

The CSPC License Agreement will expire automatically upon the expiration of the last royalty term of the last Licensed Product, with each royalty term expiring on a country-by-country basis upon the later of: (i) the expiration or abandonment of the last-to-expire Licensed Patent covering a Licensed Product; (ii) 10 years after the date of first commercial sale in the applicable country; and (iii) expiration of regulatory exclusivity for the Licensed Product in the applicable country.

The CSPC License Agreement may be terminated by us for any reason upon 180 days prior written notice to CSPC. CSPC may terminate the CSPC License Agreement if we or any sublicensee commences an action challenging the Licensed Patents or following the occurrence of certain change of control transactions. Either party may terminate the CSPC License Agreement (i) for an uncured material breach of the CSPC License Agreement by the other party or (ii) if, at any time, the other party undergoes certain bankruptcy, insolvency or dissolution proceedings.

Merrimack Asset Purchase Agreement

In May 2019, we entered into an asset purchase agreement (the “Asset Purchase Agreement”) with Merrimack Pharmaceuticals, Inc. (the “previous sponsor”), pursuant to which we acquired the previous sponsor’s anti-HER3 antibody programs (the “Acquired Product Candidates”), including seribantumab. Upon closing of the Asset Purchase Agreement in July 2019, we paid the previous sponsor an upfront cash payment of $3.5 million. In addition to the

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foregoing payment, we may become obligated to pay the previous sponsor up to $54.5 million in additional potential development, regulatory approval and commercial-based milestone payments, consisting of:

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$3.0 million for achievement of the primary endpoint in the first registrational clinical trial of any Acquired Product Candidate;

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up to $16.5 million in total payments for the achievement of various regulatory approval and reimbursement-based milestones in the United States, Europe and Japan; and

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up to $35.0 million in total payments for achieving various cumulative worldwide net sales targets between $100.0 million and $300.0 million for the Acquired Product Candidates.

Dyax Collaboration Agreement

Pursuant to the Asset Purchase Agreement with the previous sponsor, we (i) assumed all of the previous sponsor’s obligations and rights under the amended and restated collaboration agreement (the “Dyax Collaboration Agreement”), between the previous sponsor and Dyax Corp. (“Dyax”), which was entered into in January 2007, including an exclusive, worldwide product license to clinically develop or commercialize seribantumab and (ii) agreed to be bound to the terms of a sublicense agreement between the previous sponsor and Dyax entered into in June 2008. Under the Dyax Collaboration Agreement, Dyax used its proprietary phage display technology to identify antibodies that bind to targets of interest to us as therapeutics or diagnostics. Seribantumab was identified through the Dyax Collaboration Agreement. In January 2016, Dyax was acquired by Shire plc, which was subsequently acquired by Takeda Pharmaceutical Company Limited in January 2019.

We may be required to make additional maximum aggregate development and regulatory milestone payments of up to approximately $9.3 million for seribantumab. In addition, Dyax is entitled to tiered mid-single digit royalties based on net sales of seribantumab. Our obligation to pay royalties to Dyax continues on a country-by-country basis until the later of a specified number of years after the first commercial sale of seribantumab in such country and the expiration of the patent rights covering the product in such country. We are obligated to use commercially reasonable efforts to develop and commercialize the antibodies for which we obtain a commercial license.

The Dyax Collaboration Agreement will remain in effect, unless terminated earlier, for so long as we or any of our affiliates or sublicensees continue to develop or commercialize products that remain royalty-bearing under the Dyax Collaboration Agreement. Either party may terminate the Dyax Collaboration Agreement in the event of an uncured material breach by the other party. We also may terminate the Dyax Collaboration Agreement in its entirety or on a product-by-product basis at any time upon 90 days’ prior written notice.

Ligand Commercial License Agreement

Pursuant to the Asset Purchase Agreement with the previous sponsor, we purchased from the previous sponsor all of the right, title and interest in and to the commercial license agreement between the previous sponsor and Selexis SA (“Selexis”), for non-exclusive rights to technology for use in the manufacture of certain biologic products. Under this agreement, we are required to make aggregate milestone payments of up to €0.9 million, per licensed product, and pay royalties of less than one percent on net sales of product, which royalty payments expire in 2026. The obligation to pay royalties with respect to each product sold in a country continues until the expiration of the patent rights covering the product in such country. Either party may terminate the agreement in the event of an uncured material breach by the other party. We also have the right to terminate the agreement at any time upon 60 days’ prior written notice. In November of 2021, this agreement was assigned from Selexis to Ligand Pharmaceuticals Incorporated (“Ligand”).

Financing Agreements

K2HV Loan and Security Agreement

In July 2022, we entered into a loan and security agreement (the “Loan Agreement”) with K2 HealthVentures LLC (together with its affiliates, “K2HV”, and together with any other lender from time to time party thereto, the “Lenders”), as administrative agent for the Lenders, and Ankura Trust Company, LLC, as collateral agent for the Lenders. The Loan Agreement provides up to $50.0 million principal in term loans (the “Term Loan”) consisting of a first tranche of $30.0

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million funded at closing and a subsequent second tranche of up to $20.0 million upon our request before March 1, 2025, subject to review by the Lenders of certain information from us and discretionary approval by the Lenders. In connection with entering into the Loan Agreement, we also issued to K2HV a warrant to purchase shares of our common stock.

In March 2024, we entered into an amendment to the Loan Agreement with K2HV, pursuant to which: (i) the amortization date of the Term Loan was amended from March 1, 2025 to June 1, 2026; (ii) we issued to K2HV a new warrant to purchase shares of our common stock in exchange for the original warrant ; (iii) upon the Lenders’ election to convert any portion of the principal amount of the term loans then outstanding, up to $3.25 million in principal amount, into shares of the our common stock, as described below, designated holders will also receive a warrant to purchase an equal number of shares of our common stock (the “Conversion Warrant”), subject to customary beneficial ownership limitations; and (iv) we paid a customary amendment fee.

The Term Loan will mature on August 1, 2026, with interest-only payments until June 1, 2026, and thereafter interest and principal payments for the remainder of the term. It bears a variable interest rate equal to the greater of (i) 7.95% and (ii) the sum of (A) the prime rate last quoted in The Wall Street Journal (or a comparable replacement rate, as determined by the Lenders, if The Wall Street Journal ceases to quote such rate) and (B) 3.20%. Upon the final payment under the Loan Agreement, the Lenders are entitled to an end of term charge equal to 6.45% of the aggregate original principal amount of the term loans made pursuant to the Loan Agreement.

We may prepay, at its option, all, but not less than all, of the outstanding principal balance and all accrued and unpaid interest with respect to the principal balance being prepaid of the term loans, subject to a prepayment premium as follows: 3% of the Loan amounts prepaid if such prepayment occurs in the first year after funding; 2% if such prepayment occurs in the second year after funding; 1% if such prepayment occurs in the third year after funding; and 0% thereafter.

The Lenders may elect at any time following the closing and prior to the full repayment of the term loans to convert any portion of the principal amount of the term loans then outstanding, up to an aggregate of $3.25 million in principal amount, into shares of our common stock and the Conversion Warrant at a conversion price of $2.25 (the effective price per share of common stock sold in the Company’s June 2023 offering (see Note 10)), subject to customary 19.99% Nasdaq beneficial ownership limitations. We also granted registration rights to the Lenders with respect to shares received upon such conversion.

Further, the Lenders may elect to invest up to $5.0 million in our future equity financings, provided such investment is limited to no more than 10% of the total amount raised in such equity financing.

The Loan Agreement contains customary representations and warranties, events of default and affirmative and negative covenants, including covenants that limit or restrict our ability to, among other things, dispose of assets, make changes to our business, management, ownership or business locations, merge or consolidate, incur additional indebtedness, pay dividends or other distributions or repurchase equity, make investments, and enter into certain transactions with affiliates, in each case subject to certain exceptions. The Loan Agreement also contains covenants requiring that we maintain cash, cash equivalents and marketable securities balance of at least $25.0 million so long as our total market capitalization is less than $250.0 million.

As security for its obligations under the Loan Agreement, the Company granted the Lenders a first priority security interest on substantially all of the Company’s assets (other than intellectual property), subject to certain exceptions.

Intellectual Property

We strive to protect the proprietary technologies that we believe are important to our business, including seeking and maintaining patent protection intended to cover the compositions of matter of our product candidates, their methods of use, and other inventions that are important to our business.

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

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technological innovation to develop, strengthen, and maintain our proprietary position in the field of selective cancer therapy.

Our wholly owned patent portfolio includes a patent family with claims directed to antibodies and related compositions covering seribantumab, as well as methods of treating cancer using such antibodies and compositions. The family contains three U.S. patents directed to seribantumab which expire in February 2028 and a fourth U.S. patent which expires in October 2029 (including 614 days of Patent Term Adjustment), subject to any disclaimers or extensions. The family also contains a pending U.S. application, which if issued, would expire in February 2028, subject to any disclaimers or extensions.

In addition, the above-discussed patent family includes granted patents in China, Europe, Hong Kong, Israel, and Japan with claims directed to compositions of matter covering seribantumab and related methods of therapy. These patents expire in February 2028, subject to any disclaimers or extensions.

Our patent portfolio further includes an additional early-stage, published patent family specifically covering the use of seribantumab to treat patients harboring an NRG1 fusion according to our CRESTONE clinical trial dosing regimen. Any patents issuing from this family would expire in March 2042, subject to any disclaimers or extensions.

The term of individual patents depends upon the legal term of the patents in the countries in which they are obtained. In the countries in which we file, the patent term is 20 years from the earliest non-provisional filing date, subject to any disclaimers or extensions. The term of a patent in the United States can be adjusted due to any failure of the United States Patent and Trademark Office following certain statutory and regulation deadlines for issuing a patent.

In the United States, the patent term of a patent that covers an FDA-approved drug may also be eligible for patent term extension, which permits patent term restoration as compensation for a portion of the patent term lost during the FDA regulatory review process. The Hatch-Waxman Act permits a patent term extension of up to five years beyond the original expiration of the patent. The protection provided by a patent varies from country to country, and is dependent on the type of patent granted, the scope of the patent claims, and the legal remedies available in a given country.

It is our policy to require our employees, consultants, outside scientific collaborators, sponsored researchers and other advisors to execute confidentiality agreements upon the commencement of employment or consulting relationships with us. These agreements provide that all confidential information concerning our business or financial affairs developed or made known to the individual during the course of the individual’s relationship with us is to be kept confidential and not disclosed to third parties except in specific circumstances. In the case of employees, the agreements provide that all inventions conceived by the individual, and which are related to our current or planned business or research and development or made during normal working hours, on our premises or using our equipment or proprietary information, are our exclusive property.

Governmental Regulation and Product Approval

Government authorities in the United States, at the federal, state and local levels, and in other countries and jurisdictions, extensively regulate, among other things, the research, development, testing, manufacture, quality control, approval, packaging, storage, recordkeeping, labeling, advertising, promotion, distribution, marketing, post-approval monitoring and reporting, and import and export of pharmaceutical products. The processes for obtaining regulatory approvals in the United States and in foreign countries and jurisdictions, along with subsequent compliance with applicable statutes and regulations and other regulatory authorities, require the expenditure of substantial time and financial resources.

FDA Approval Process

In the United States, biological products are subject to extensive regulation by the FDA. The Federal Food, Drug, and Cosmetic Act (the “FDC Act”), and other federal and state statutes and regulations, govern, among other things, the research, development, testing, manufacture, storage, recordkeeping, approval, labeling, promotion and marketing, distribution, post-approval monitoring and reporting, sampling, and import and export of pharmaceutical products. Biological products used for the prevention, treatment, or cure of a disease or condition of a human being are subject to regulation under the FDC Act, with the exception that the section of the FDC Act that governs the approval of drugs via new drug applications (“NDAs”), does not apply to the approval of biologics. In contrast, biologics are approved for marketing under provisions of the Public Health Service Act (the “PHSA”), via a biologics license application (“BLA”).

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However, the application process and requirements for approval of BLAs are very similar to those for NDAs. Failure to comply with applicable U.S. requirements may subject a company to a variety of administrative or judicial sanctions, such as clinical hold, FDA refusal to approve pending BLAs, warning or untitled letters, product recalls, product seizures, total or partial suspension of production or distribution, injunctions, fines, civil penalties, and criminal prosecution.

Biological product development for a new product in the United States typically involves preclinical laboratory and animal tests, the submission to the FDA of an IND, which must become effective before clinical testing may commence, and adequate and well-controlled clinical trials to establish the safety and effectiveness of the drug for each indication for which FDA approval is sought. Satisfaction of FDA pre-market approval requirements typically takes many years and the actual time required may vary substantially based upon the type, complexity, and novelty of the product or disease.

Preclinical tests include laboratory evaluation of product chemistry, formulation, and toxicity, as well as animal trials to assess the characteristics and potential safety and efficacy of the product. The conduct of the preclinical tests must comply with federal regulations and requirements, including Good Laboratory Practices. The results of preclinical testing are submitted to the FDA as part of an IND along with other information, including information about product chemistry, manufacturing and controls, and a proposed clinical trial protocol. Long-term preclinical tests, such as tests of reproductive toxicity and carcinogenicity in animals, may continue after the IND is submitted. A 30-day waiting period after the submission of each IND is required prior to the commencement of clinical testing in humans. If the FDA has neither commented on nor questioned the IND within this 30-day period, the clinical trial proposed in the IND may begin. Clinical trials involve the administration of the investigational drug or biologic to healthy volunteers or patients under the supervision of a qualified investigator. Clinical trials must be conducted: (i) in compliance with federal regulations; (ii) in compliance with Good Clinical Practice (“GCP”), an international standard meant to protect the rights and health of patients and to define the roles of clinical trial sponsors, administrators, and monitors; as well as (iii) under protocols detailing the objectives of the trial, the parameters to be used in monitoring safety, and the effectiveness criteria to be evaluated. Each protocol involving testing on U.S. patients and subsequent protocol amendments must be submitted to the FDA as part of the IND.

The FDA may order the temporary or permanent discontinuation of a clinical trial at any time, or impose other sanctions, if it believes that the clinical trial either is not being conducted in accordance with FDA regulations or presents an unacceptable risk to the clinical trial patients. Imposition of a clinical hold may be full or partial. The study protocol and informed consent information for patients in clinical trials must also be submitted to an institutional review board (“IRB”), for approval. The IRB will also monitor the clinical trial until completed. An IRB may also require the clinical trial at the site to be halted, either temporarily or permanently, for failure to comply with the IRB’s requirements, or may impose other conditions. Additionally, some clinical trials are overseen by an independent group of qualified experts organized by the clinical trial sponsor, known as a data safety monitoring board or committee. This group provides authorization for whether a trial may move forward at designated checkpoints based on access to certain data from the trial.

Clinical trials to support BLAs for marketing approval are typically conducted in three sequential phases. In Phase 1, the initial introduction of the drug or biologic into patients, the product is tested to assess safety, dosage tolerance, metabolism, pharmacokinetics, pharmacological actions, side effects associated with drug exposure, and to obtain early evidence of a treatment effect if possible. Phase 2 usually involves trials in a limited patient population to determine the effectiveness of the biologic for a particular indication, determine optimal dose and regimen, and to identify common adverse effects and safety risks. If a compound demonstrates evidence of effectiveness and an acceptable safety profile in Phase 2 evaluations, Phase 3 trials are undertaken to obtain additional information about clinical effects and confirm efficacy and safety in a larger number of patients, typically at geographically dispersed clinical trial sites, to permit the FDA to evaluate the overall benefit-risk relationship of the biologic and to provide adequate information for the labeling of the product. In most cases, the FDA requires two adequate and well-controlled Phase 3 clinical trials to demonstrate the safety and efficacy of the biologic. In rare instances, a single Phase 3 trial may be sufficient when either (1) the trial is a large, multicenter trial demonstrating internal consistency and a statistically very persuasive finding of a clinically meaningful effect on mortality, irreversible morbidity or prevention of a disease with a potentially serious outcome and confirmation of the result in a second trial would be practically or ethically impossible or (2) the single trial is supported by other confirmatory evidence. Approval on the basis of a single trial may be subject to a requirement for additional post-approval studies.

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These phases may overlap or be combined. For example, a Phase 1/2 clinical trial may contain both a dose-escalation stage and a dose-expansion stage, the latter of which may confirm tolerability at the recommended dose for expansion in future clinical trials (as in traditional Phase 1 clinical trials) and provide insight into the anti-tumor effects of the investigational therapy in selected subpopulation(s). Typically, during the development of oncology therapies, all subjects enrolled in Phase 1 clinical trials are disease-affected patients and, as a result, considerably more information on clinical activity may be collected during such trials than during Phase 1 clinical trials for non-oncology therapies.

In addition, the manufacturer of an investigational biologic in a Phase 2 or Phase 3 clinical trial for a serious or life-threatening disease is required to make available, such as by posting on its website, its policy on evaluating and responding to requests for expanded access to such investigational drug or biologic.

After completion of the required clinical testing, a BLA is prepared and submitted to the FDA. FDA approval of the BLA is required before marketing and distribution of the product may begin in the United States. The BLA must include the results of all preclinical, clinical, and other testing and a compilation of data relating to the product’s pharmacology, chemistry, manufacture, and controls. The cost of preparing and submitting a BLA is substantial. The submission of most BLAs is additionally subject to a substantial application user fee. Under an approved BLA, the applicant is also subject to an annual program fee. These fees typically increase annually. A BLA for a drug that has been designated as an orphan drug is not subject to an application fee, unless the BLA includes an indication for other than a rare disease or condition. The FDA has 60 days from its receipt of a BLA to determine whether the application will be filed based on the FDA’s determination that it is adequately organized and sufficiently complete to permit substantive review. Once the submission is filed, the FDA begins an in-depth review. The FDA has agreed to certain performance goals to complete the review of BLAs. Most applications are classified as Standard Review products that are reviewed within ten months of the date the FDA files the BLA; applications classified as Priority Review are reviewed within six months of the date the FDA files the BLA. A BLA can be classified for Priority Review when the FDA determines the biologic has the potential to treat a serious or life-threatening condition and, if approved, would be a significant improvement in safety or effectiveness compared to available therapies. The review process for both standard and priority reviews may be extended by the FDA for three or more additional months to consider certain late-submitted information, or information intended to clarify information already provided in the BLA submission.

The FDA may also refer applications for novel biologic products, as well as biologic products that present difficult questions of safety or efficacy, to be reviewed by an advisory committee — typically a panel that includes clinicians, statisticians and other experts — for review, evaluation, and a recommendation as to whether the BLA should be approved. The FDA is not bound by the recommendation of an advisory committee, but generally follows such recommendations. Before approving a BLA, the FDA will typically inspect one or more clinical sites to assure compliance with GCP. Additionally, the FDA will inspect the facility or the facilities at which the biologic product is manufactured. The FDA will not approve the product unless compliance with current good manufacturing practice (“cGMP”) is satisfactory and the BLA contains data that provide substantial evidence that the drug is safe and effective, or the biologic is safe, pure, potent, and effective, in the respective claimed indication.

After the FDA evaluates the BLA and completes any clinical and manufacturing site inspections, it issues either an approval letter or a complete response letter. A complete response letter generally outlines the deficiencies in the BLA submission and may require substantial additional testing, or information, in order for the FDA to reconsider the application for approval. If, or when, those deficiencies have been addressed to the FDA’s satisfaction in a resubmission of the BLA, the FDA will issue an approval letter. The FDA has committed to reviewing such resubmissions in two or six months depending on the type of information included. An approval letter authorizes commercial marketing and distribution of the biologic with specific prescribing information for specific indications. As a condition of BLA approval, the FDA may require a risk evaluation and mitigation strategy (“REMS”), to help ensure that the benefits of the biologic outweigh the potential risks to patients. A REMS can include medication guides, communication plans for healthcare professionals, and elements to assure a product’s safe use (“ETASU”). An ETASU can include, but is not limited to, special training or certification for prescribing or dispensing the product, dispensing the product only under certain circumstances, special monitoring, and the use of patient-specific registries. The requirement for a REMS can materially affect the potential market and profitability of the product. Moreover, the FDA may require substantial post-approval testing and surveillance to monitor the product’s safety or efficacy.

Once granted, product approvals may be withdrawn if compliance with regulatory standards is not maintained or problems are identified following initial marketing. Changes to some of the conditions established in an approved BLA, including changes in indications, product labeling, manufacturing processes or facilities, require submission and FDA

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approval of a new BLA, or supplement to an approved BLA, before the change can be implemented. A BLA supplement for a new indication typically requires clinical data similar to that in the original application, and the FDA uses the same procedures and actions in reviewing BLA supplements as it does in reviewing original BLAs.

Fast Track Designation and Priority Review

FDA is required to facilitate the development, and expedite the review, of drugs or biologic products that are intended for the treatment of a serious or life-threatening disease or condition for which there is no effective treatment and which demonstrate the potential to address unmet medical needs for the condition. Fast track designation may be granted for products that are intended to treat a serious or life-threatening disease or condition for which there is no effective treatment and preclinical or clinical data demonstrate the potential to address unmet medical needs for the condition. Fast track designation applies to both the product and the specific indication for which it is being studied. Any product submitted to FDA for marketing, including under a fast track program, may be eligible for other types of FDA programs intended to expedite development and review, such as priority review.

Priority review may be granted for products that are intended to treat a serious or life-threatening condition and, if approved, would provide a significant improvement in safety and effectiveness compared to available therapies. FDA will attempt to direct additional resources to the evaluation of an application designated for priority review in an effort to facilitate the review.

Breakthrough Therapy Designation

FDA is also required to expedite the development and review of applications for approval of products that are intended to treat a serious or life-threatening disease or condition where preliminary clinical evidence indicates that the biologic may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints. Under the breakthrough therapy program, the sponsor of a new product candidate may request that FDA designate the product candidate for a specific indication as a breakthrough therapy concurrent with, or after, the submission of the IND for the product candidate. FDA must determine if the product candidate qualifies for breakthrough therapy designation within 60 days of receipt of the sponsor’s request. The FDA may take certain actions with respect to breakthrough therapies, including holding meetings with the sponsor throughout the development process, providing timely advice to the product sponsor regarding development and approval, involving more senior staff in the review process, assigning a cross-disciplinary project lead for the review team and taking other steps to design the clinical studies in an efficient manner.

Accelerated Approval

Accelerated approval may be granted for a product that is intended to treat a serious or life-threatening condition and that generally provides a meaningful therapeutic advantage to patients over existing treatments. A product eligible for accelerated approval may be approved on the basis of either a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity or prevalence of the condition and the availability or lack of alternative treatments. The accelerated approval pathway is most often used in settings in which the course of a disease is long, and an extended period of time is required to measure the intended clinical benefit of a product, even if the effect on the surrogate or intermediate clinical endpoint occurs rapidly. Thus, accelerated approval has been used extensively in the development and approval of products for treatment of a variety of cancers in which the goal of therapy is generally to improve survival or decrease morbidity and the duration of the typical disease course requires lengthy and sometimes large studies to demonstrate a clinical or survival benefit. The accelerated approval pathway is contingent on a sponsor’s agreement to conduct additional post-approval confirmatory studies to verify and describe the product’s clinical benefit. These confirmatory trials must be completed with due diligence and, in most cases, the FDA may require that the trial be designed, initiated, and/or fully enrolled prior to approval. Failure to conduct required post-approval studies, or to confirm a clinical benefit during post-marketing studies, would allow the FDA to withdraw the product from the market on an expedited basis. All promotional materials for product candidates approved under accelerated regulations are subject to prior review by the FDA.

The Food and Drug Omnibus Reform Act (“FDORA”), which was enacted in December 2022, included provisions related to the accelerated approval pathway. Pursuant to FDORA, the FDA is authorized to require a post-approval study to be underway prior to approval or within a specified time period following approval. FDORA also requires the FDA to

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specify conditions of any required post-approval study, which may include milestones such as a target date of study completion and requires sponsors to submit progress reports for required post-approval studies and any conditions required by the FDA not later than 180 days following approval and not less frequently than every 180 days thereafter until completion or termination of the study. FDORA enables the FDA to initiate enforcement action for the failure to conduct with due diligence a required post-approval study, including a failure to meet any required conditions specified by the FDA or to submit timely reports.

Orphan Drugs

Under the Orphan Drug Act, FDA may grant orphan drug designation to products intended to treat a rare disease or condition, which is generally a disease or condition that affects fewer than 200,000 individuals in the United States, or more than 200,000 individuals in the United States but for which there is no reasonable expectation that the cost of developing and making the product for this type of disease or condition will be recovered from sales of the product in the United States.

Orphan drug designation must be requested before submitting a BLA. After FDA grants orphan drug designation, the identity of the drug and its potential orphan use are disclosed publicly by FDA. Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process.

The first BLA applicant to receive FDA approval for a particular active moiety to treat a rare disease for which it has such designation is entitled to a seven-year exclusive marketing period in the U.S. for that product, for that indication. During the seven-year exclusivity period, FDA may not approve any other applications to market the same drug for the same disease, except in limited circumstances, such as a showing of clinical superiority to the product with orphan drug exclusivity by means of greater effectiveness, greater safety, or providing a major contribution to patient care, or in instances of drug supply issues. Orphan drug exclusivity does not prevent FDA from approving a different drug for the same disease or condition, or the same drug for a different disease or condition. Other benefits of orphan drug designation include tax credits for certain research and an exemption from the BLA application fee.

Disclosure of Clinical Trial Information

Sponsors of clinical trials of FDA-regulated products, including drugs and biologic products, are required to register and disclose certain clinical trial information on the website www.clinicaltrials.gov. Information related to the product, patient population, phase of investigation, trial sites and investigators, and other aspects of a clinical trial are then made public as part of the registration. Sponsors are also obligated to disclose the results of their clinical trials after completion. Disclosure of the results of clinical trials can be delayed in certain circumstances for up to two years after the date of completion of the trial. Competitors may use this publicly available information to gain knowledge regarding the progress of clinical development programs as well as clinical trial design.

Pediatric Information

Under the Pediatric Research Equity Act (the “PREA”), BLAs, or supplements to BLAs must contain data to assess the safety and effectiveness of the biological product for the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the biological product is safe and effective. The FDA may grant full or partial waivers, or deferrals, for submission of data. Unless otherwise required by regulation, the PREA does not apply to any biological product with orphan product designation except a product with a new active ingredient that is a molecularly targeted cancer product intended for the treatment of an adult cancer and directed at a molecular target determined by FDA to be substantially relevant to the growth or progression of a pediatric cancer.

The Best Pharmaceuticals for Children Act (the “BPCA”), provides a six-month extension of any non-patent exclusivity for a biologic if certain conditions are met. Conditions for exclusivity include the FDA’s determination that information relating to the use of a new biologic in the pediatric population may produce health benefits in that population, FDA making a written request for pediatric studies, and the applicant agreeing to perform, and reporting on, the requested studies within the statutory timeframe. Applications under the BPCA are treated as priority applications, with all of the benefits that designation confers.

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Additional Controls for Biologics

To help reduce the increased risk of the introduction of adventitious agents, the PHSA emphasizes the importance of manufacturing controls for products whose attributes cannot be precisely defined. The PHSA also provides authority to the FDA to immediately suspend biologics licenses in situations where there exists a danger to public health, to prepare or procure products in the event of shortages and critical public health needs, and to authorize the creation and enforcement of regulations to prevent the introduction or spread of communicable diseases within the United States.

After a BLA is approved, the product may also be subject to official lot release as a condition of approval. As part of the manufacturing process, the manufacturer is required to perform certain tests on each lot of the product before it is released for distribution. If the product is subject to official release by the FDA, the manufacturer submits samples of each lot of product to the FDA together with a release protocol showing a summary of the lot manufacturing history and the results of all of the manufacturer’s tests performed on the lot. The FDA may also perform certain confirmatory tests on lots of some products, such as viral vaccines, before allowing the manufacturer to release the lots for distribution. In addition, the FDA conducts laboratory research related to the regulatory standards on the safety, purity, potency, and effectiveness of biological products. As with drugs, after approval of a BLA, biologics manufacturers must address any safety issues that arise, are subject to recalls or a halt in manufacturing, and are subject to periodic inspection after approval.

Post-Approval Requirements

Once a BLA is approved, a product will be subject to certain post-approval requirements. For instance, the FDA closely regulates the post-approval marketing and promotion of biologics, including standards and regulations for direct-to-consumer advertising, off-label promotion, industry-sponsored scientific and educational activities and promotional activities involving the Internet. Although physicians may prescribe legally available drugs for off-label uses, manufacturers may not market or promote such off-label uses. Biologics may be marketed only for the approved indications and in accordance with the provisions of the approved labeling.

Adverse event reporting and submission of periodic safety summary reports is required following FDA approval of a BLA. The FDA also may require post-marketing testing, known as Phase 4 testing, REMS, and surveillance to monitor the effects of an approved product, or the FDA may place conditions on an approval that could restrict the distribution or use of the product. In addition, quality control, biological product manufacture, packaging, and labeling procedures must continue to conform to cGMPs after approval. Biologics manufacturers and certain of their subcontractors are required to register their establishments with the FDA and certain state agencies. Registration with the FDA subjects entities to periodic unannounced inspections by the FDA, during which the agency inspects a biologic product’s manufacturing facilities to assess compliance with cGMPs. Accordingly, manufacturers must continue to expend time, money, and effort in the areas of production and quality-control to maintain compliance with cGMPs. Regulatory authorities may withdraw product approvals or request product recalls if a company fails to comply with required regulatory standards, if it encounters problems following initial marketing, or if previously unrecognized problems are subsequently discovered.

Biosimilars

The Biologics Price Competition and Innovation Act of 2009 (the “BPCIA”), creates an abbreviated approval pathway for biological products shown to be biosimilar to or interchangeable with an FDA-licensed reference biological product. Biosimilars are licensed based on the FDA’s findings of safety, purity and potency for a prior FDA-licensed product called a reference product. There must be no differences in conditions of use, route of administration, dosage form and strength to rely on a given reference product, and there must be no clinically meaningful differences between the biological product and the reference product in terms of safety, purity and potency. Biosimilarity must be shown through analytical trials, animal trials and at least one clinical trial, absent a waiver from the FDA. A biosimilar product may also meet the higher hurdle of interchangeability such that it can be substituted for a reference product without the intervention of the prescribing health care provider if the sponsor can demonstrate that the biosimilar product can be expected to produce the same clinical results as the reference product and, for products administered multiple times, the biologic and the reference biologic may be switched after one has been previously administered without increasing safety risks or risks of diminished efficacy relative to exclusive use of the reference biologic. The first biosimilar product was approved under the BPCIA in 2015, and the first interchangeable product was approved in 2021. Complexities associated with the larger, and often more complex, structures of biological products, as well as the process by which

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such products are manufactured, pose some hurdles to biosimilar product implementation, which is still being evaluated by the FDA.

A reference biologic is granted 12 years of data exclusivity from the time of first licensure, or BLA approval, of the reference product, during which time no application for a biosimilar relying on the reference product can be submitted for four years from the date of first licensure of the reference product. The first biologic product submitted under the biosimilar abbreviated approval pathway that is determined to be interchangeable with the reference product is eligible for exclusivity, precluding marketing of interchangeable biosimilars referencing the same reference product for the lesser of (i) one year after first commercial marketing of the first interchangeable biosimilar to be approved, (ii) 18 months after the first interchangeable biosimilar is approved if there is no patent challenge, (iii) 18 months after resolution of a lawsuit over the patents of the reference biologic in favor of the first interchangeable biosimilar applicant, or (iv) 42 months after the first interchangeable biosimilar’s application has been approved if a patent lawsuit is ongoing within the 42-month period.

FDA Approval and Regulation of Companion and Complementary Diagnostics

If safe and effective use of a product depends on an in vitro diagnostic, then the FDA generally will require approval or clearance of that diagnostic, known as a companion diagnostic, before or at the same time that the FDA approves the therapeutic product. In August 2014, the FDA issued final guidance clarifying the requirements that will apply to approval of therapeutic products and in vitro companion diagnostics. According to the guidance, if FDA determines that a companion diagnostic device is essential to the safe and effective use of a new therapeutic product or indication, FDA generally will not approve the therapeutic product or new therapeutic product indication if the companion diagnostic device is not approved or cleared for that indication.

The FDA has also introduced the concept of a complementary diagnostic, which the FDA defines as a test that is not required but which provides significant information about the use of a drug. A complementary test can help guide treatment strategy and identify which patients are likely to derive the greatest benefit from therapy, and if approved by the FDA information regarding the IVD will be included in the therapeutic product labeling.

Approval or clearance of the companion or complementary diagnostic device will ensure that the device has been adequately evaluated and has adequate performance characteristics in the intended population. The review of in vitro companion or complementary diagnostics in conjunction with the review of our products will, therefore, likely involve coordination of review by CDER and the FDA’s Office of In Vitro Diagnostics and Radiological Health. We may partner with a diagnostic provider to develop a companion or complementary diagnostic for certain of our product candidates. Review and approval of a companion or complementary diagnostic is typically done in parallel with development of the therapeutic product. However, it is possible that the FDA may permit approval of the companion or complementary diagnostic as a post-marketing commitment following a potential regulatory approval.

Under the FDC Act, in vitro diagnostics, including companion or complementary diagnostics, are regulated as medical devices. In the United States, the FDC Act and its implementing regulations, and other federal and state statutes and regulations govern, among other things, medical device design and development, preclinical and clinical testing, premarket clearance or approval, registration and listing, manufacturing, labeling, storage, advertising and promotion, sales and distribution, export and import, and post-market surveillance. Unless an exemption applies, diagnostic tests require marketing clearance or approval from the FDA prior to commercial distribution. The two primary types of FDA marketing authorization applicable to a medical device are premarket notification, also called 510(k) clearance, and premarket approval (“PMA approval”). The vast majority of companion and complementary diagnostics require PMA approval.

The PMA process, including the gathering of clinical and preclinical data and the submission to and review by the FDA, can take several years or longer. It involves a rigorous premarket review during which the applicant must prepare and provide the FDA with reasonable assurance of the device’s safety and effectiveness and information about the device and its components regarding, among other things, device design, manufacturing and labeling. PMA applications are subject to an application fee. In addition, PMAs for certain devices must generally include the results from extensive preclinical and adequate and well-controlled clinical trials to establish the safety and effectiveness of the device for each indication for which FDA approval is sought. In particular, for a diagnostic, a PMA application typically requires data regarding analytical and clinical validation studies. As part of the PMA review, the FDA will typically inspect the

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manufacturer’s facilities for compliance with the Quality System Regulation (the “QSR”), which imposes elaborate testing, control, documentation and other quality assurance requirements.

PMA approval is not guaranteed, and the FDA may ultimately respond to a PMA submission with a not approvable determination based on deficiencies in the application and require additional clinical trial or other data that may be expensive and time-consuming to generate and that can substantially delay approval. If the FDA’s evaluation of the PMA application is favorable, the FDA typically issues an approvable letter requiring the applicant’s agreement to specific conditions, such as changes in labeling, or specific additional information, such as submission of final labeling, in order to secure final approval of the PMA. If the FDA’s evaluation of the PMA or manufacturing facilities is not favorable, the FDA will deny approval of the PMA or issue a not approvable letter. A not approvable letter will outline the deficiencies in the application and, where practical, will identify what is necessary to make the PMA approvable. The FDA may also determine that additional clinical trials are necessary, in which case the PMA approval may be delayed for several months or years while the trials are conducted and then the data submitted in an amendment to the PMA. If the FDA concludes that the applicable criteria have been met, the FDA will issue a PMA for the approved indications, which can be more limited than those originally sought by the applicant. The PMA can include post-approval conditions that the FDA believes necessary to ensure the safety and effectiveness of the device, including, among other things, additional testing and/or restrictions on labeling, promotion, sale and distribution. Once granted, PMA approval may be withdrawn by the FDA if compliance with post approval requirements, conditions of approval or other regulatory standards are not maintained, or problems are identified following initial marketing.

After a device is placed on the market, it remains subject to significant regulatory requirements. Medical devices may be marketed only for the uses and indications for which they are cleared or approved. Device manufacturers must also register their establishments and list their devices with the FDA. A medical device manufacturer’s manufacturing processes and the processes of the specification developer and repackager/relabeler (if different from the manufacturer) and initial importer (if manufactured outside of the United States), are required to comply with the applicable portions of the QSR, which cover the methods and documentation of the design, testing, production, processes, controls, quality assurance, labeling, packaging and shipping of medical devices. Facility records and manufacturing processes are subject to periodic unscheduled inspections by the FDA.

Other Healthcare Laws

In addition to FDA restrictions on marketing of pharmaceutical products, several other types of state and federal laws have been applied to restrict certain general business and marketing practices in the pharmaceutical industry. These laws include anti-kickback, false claims, price transparency and reporting, privacy and cybersecurity laws and other healthcare laws and regulations.

The federal Anti-Kickback Statute prohibits, among other things, knowingly and willfully offering, paying, soliciting or receiving remuneration to induce, or in return for, purchasing, leasing, ordering or arranging for the purchase, lease or order of any healthcare item or service reimbursable under Medicare, Medicaid, or other federally financed healthcare programs. The Patient Protection and Affordable Care Act as amended by the Health Care and Education Reconciliation Act (the “ACA”), amended the intent element of the federal Anti-Kickback Statute so that a person or entity no longer needs to have actual knowledge of the statute or specific intent to violate it in order to commit a violation. This statute has been interpreted to apply to arrangements between pharmaceutical manufacturers on the one hand and prescribers, purchasers and formulary managers, among others, on the other. Although there are a number of statutory exceptions and regulatory safe harbors protecting certain common activities from prosecution or other regulatory sanctions, the exceptions and safe harbors are drawn narrowly, and practices that involve remuneration intended to induce prescribing, purchases or recommendations may be subject to scrutiny if they do not qualify for an exception or safe harbor. Additionally, the ACA amended the federal Anti-Kickback Statute such that a violation of that statute can serve as a basis for liability under the federal civil False Claims Act.

Federal civil and criminal false claims laws, including the federal civil False Claims Act, prohibit any person or entity from knowingly presenting, or causing to be presented, a false claim for payment to the federal government, or knowingly making, or causing to be made, a false statement to have a false claim paid. This includes claims made to programs where the federal government reimburses, such as Medicare and Medicaid, as well as programs where the federal government is a direct purchaser, such as when it purchases off the Federal Supply Schedule. Pharmaceutical and other healthcare companies have been prosecuted under these laws for, among other things, allegedly inflating drug prices they report to pricing services, which in turn were used by the government to set Medicare and Medicaid

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reimbursement rates, and for allegedly providing free product to customers with the expectation that the customers would bill federal programs for the product. In addition, certain marketing practices, including off-label promotion, may also violate false claims laws. Most states also have statutes or regulations similar to the federal Anti-Kickback Statute and civil False Claims Act, which apply to items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor.

Other federal statutes pertaining to healthcare fraud and abuse include the civil monetary penalties statute, which prohibits, among other things, the offer or payment of remuneration to a Medicaid or Medicare beneficiary that the offeror or payor knows or should know is likely to influence the beneficiary to order a receive a reimbursable item or service from a particular supplier, and the additional federal criminal statutes created by the Health Insurance Portability and Accountability Act of 1996 (“HIPAA”), which prohibit, among other things, knowingly and willfully executing or attempting to execute a scheme to defraud any healthcare benefit program or obtain by means of false or fraudulent pretenses, representations or promises any money or property owned by or under the control of any healthcare benefit program in connection with the delivery of or payment for healthcare benefits, items or services.

In addition, HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009, or (“HITECH”), and their respective implementing regulations, impose obligations on certain healthcare providers, health plans, and healthcare clearinghouses, known as covered entities, as well as their business associates and their subcontractors that perform certain services involving the collection, processing, storage, use or disclosure of individually identifiable health information, including mandatory contractual terms, with respect to safeguarding the privacy, security, and transmission of protected health information, and require notification to affected individuals and regulatory authorities of certain breaches of security of individually identifiable health information. HITECH increased the civil and criminal penalties that may be imposed against covered entities, business associates and possibly other persons, and gave state attorneys general new authority to file civil actions for damages or injunctions in federal courts to enforce the federal HIPAA laws and seek attorney’s fees and costs associated with pursuing federal civil actions. In addition, many state laws govern the privacy and security of health information in certain circumstances, many of which differ from each other in significant ways and may not have the same effect, and often are not pre-empted by HIPAA or HITECH. For example, at the state level, the California Consumer Privacy Act of 2018 (“CCPA”), imposes obligations on certain businesses. These obligations include, but are not limited to, providing specific disclosures in privacy notices and affording California residents certain rights related to their personal data. In addition, the California Privacy Rights Act of 2020 (“CPRA”), which went into effect in January 2023, imposes additional obligations on companies covered by the legislation and significantly modifies the CCPA, including by expanding consumers’ rights with respect to certain sensitive personal information. The CPRA also creates a new state agency that is vested with authority to implement and enforce the CCPA and CPRA. Virginia’s Consumer Data Protection Act, which took effect in January 2023, requires businesses subject to the legislation to conduct data protection assessments in certain circumstances and requires opt-in consent from consumers to acquire and process their sensitive personal information, which includes information revealing a consumer’s physical and mental health diagnosis and genetic and biometric information that can identify a consumer. Other states have also enacted, proposed or are considering proposing data privacy laws.

Further, pursuant to the ACA, the Centers for Medicare & Medicaid Services (“CMS”), issued a final rule that requires certain manufacturers of prescription drugs to collect and annually report information on certain payments or transfers of value to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors) physician assistants, certain types of advance practice nurses, and teaching hospitals, as well as ownership and investment interests held by physicians and their immediate family members. The reported data is made available in searchable form on a public website on an annual basis. Failure to submit required information may result in civil monetary penalties.

Analogous state and foreign anti-kickback and false claims laws that may apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private insurers, or that apply regardless of payor. In addition, several states now require prescription drug companies to report certain expenses relating to the marketing and promotion of drug products and to report gifts and payments to individual healthcare practitioners in these states. Other states prohibit various marketing-related activities, such as the provision of certain kinds of gifts or meals. Further, certain states require the posting of information relating to clinical studies and their outcomes. A growing number of states require the reporting of certain drug pricing information, including information pertaining to and justifying price increases and prices of newly launched drugs. In addition, certain states require pharmaceutical companies to implement compliance programs and/or marketing codes. Several additional states are considering similar proposals. Certain states and local jurisdictions also require the registration of pharmaceutical sales representatives. Additionally, we may also be subject to state and foreign laws governing the privacy and security

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of health information in some circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts.

Efforts to ensure that business arrangements with third parties comply with applicable state, federal, and foreign healthcare laws and regulations involve substantial costs. If a drug company’s operations are found to be in violation of any such requirements, it may be subject to significant penalties, including civil, criminal and administrative penalties, damages, fines, disgorgement, imprisonment, the curtailment or restructuring of its operations, loss of eligibility to obtain approvals from the FDA, exclusion from participation in government contracting, healthcare reimbursement or other federal or state government healthcare programs, including Medicare and Medicaid, integrity oversight and reporting obligations, imprisonment, and reputational harm. Although effective compliance programs can mitigate the risk of investigation and prosecution for violations of these laws, these risks cannot be entirely eliminated. Any action for an alleged or suspected violation can cause a drug company to incur significant legal expenses and divert management’s attention from the operation of the business, even if such action is successfully defended.

U.S. Healthcare Reform

In the United States there have been, and continue to be, proposals by the federal government, state governments, regulators and third-party payors to control or manage the increased costs of health care and, more generally, to reform the U.S. healthcare system. The pharmaceutical industry has been a particular focus of these efforts and has been significantly affected by major legislative initiatives. For example, in March 2010, the ACA was enacted, which intended to broaden access to health insurance, reduce or constrain the growth of healthcare spending, enhance remedies against fraud and abuse, add new transparency requirements for the healthcare and health insurance industries, impose new taxes and fees on the health industry and impose additional health policy reforms, substantially changed the way healthcare is financed by both governmental and private insurers, and significantly impacts the U.S. pharmaceutical industry. Healthcare reforms that have been adopted, and that may be adopted in the future, could result in further reductions in coverage and levels of reimbursement for pharmaceutical products, increases in rebates payable under U.S. government rebate programs and additional downward pressure on pharmaceutical product prices.

In September 2021, the Biden administration published a wide-ranging list of policy proposals, most of which would need to be carried out by Congress, to reduce drug prices and drug payment. The U.S. Department of Health and Human Services (“HHS”), plan includes, among other reform measures, proposals to lower prescription drug prices, including by allowing Medicare to negotiate prices and disincentivizing price increases, and to support market changes that strengthen supply chains, promote biosimilars and generic drugs, and increase price transparency. These initiatives culminated in the enactment of the Inflation Reduction Act (the “IRA”) in August 2022, which will eliminate, beginning in 2025, the coverage gap under Medicare Part D by significantly lowering the enrollee maximum out-of-pocket costs and requiring manufacturers to subsidize, through a newly established manufacturer discount program, 10% of Part D enrollees’ prescription costs for brand drugs below the out-of-pocket maximum, and 20% once the out-of-pocket maximum has been reached, among other things. The IRA also allows HHS to directly negotiate the selling price of a statutorily specified number of drugs and biologics each year that CMS reimburses under Medicare Part B and Part D. Only high-expenditure single-source drugs that have been approved for at least seven years (11 years for single-source biologics) are eligible to be selected by CMS for negotiation, with the negotiated price taking effect two years after the selection year. Negotiations for Medicare Part D products begin in 2024 with the negotiated price taking effect in 2026, and negotiations for Medicare Part B products begin in 2026 with the negotiated price taking effect in 2028. In August 2023, HHS announced the 10 Medicare Part D drugs and biologics that it selected for negotiations. HHS will announce the negotiated maximum fair prices by September 2024. This price cap, which cannot exceed a statutory ceiling price, will become effective in January 2026 and will represent a significant discount from average prices to wholesalers and direct purchasers. The IRA will also impose rebates on Medicare Part B and Part D drugs whose prices have increased at a rate greater than the rate of inflation. The IRA also extends enhanced subsidies for individuals purchasing health insurance coverage in ACA marketplaces through plan year 2025. The IRA permits the Secretary of HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years. Manufacturers that fail to comply with the IRA may be subject to various penalties, including civil monetary penalties. These provisions may be subject to legal challenges. For example, the provisions related to the negotiation of selling prices of high-expenditure single-source drugs and biologics have been challenged in multiple lawsuits brought by pharmaceutical manufacturers. The outcome of these lawsuits is uncertain, and some IRA drug discount provisions have not been challenged in litigation. Thus, while it is unclear how the IRA will be implemented, it will likely have a significant impact on the pharmaceutical industry and the pricing of our products and product candidates.

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We expect that additional state and federal healthcare reform measures will be adopted in the future.

Coverage and Reimbursement

Patients in the United States and elsewhere generally rely on third-party payors to reimburse part or all of the costs associated with their prescription drugs. Accordingly, market acceptance of our drug products depends, in part, on the extent to which third-party coverage and reimbursement is available from government health administration authorities (including in connection with federal and state government healthcare programs, such as Medicare and Medicaid in the United States), private healthcare insurers and other healthcare funding organizations. Significant uncertainty exists as to the coverage and reimbursement status of any drug products for which we may obtain regulatory approval. Coverage decisions may not favor new drug products when more established or lower-cost therapeutic alternatives are already available. Patients are unlikely to use our products unless reimbursement is adequate to cover all or a significant portion of the cost of our drug products.

The market for our product candidates will depend significantly on access to third-party payors’ drug formularies or lists of medications for which third-party payors provide coverage and reimbursement. The process for determining whether a third-party payor will provide coverage for a product may be separate from the process for setting the price of a product or for establishing the reimbursement rate that such a payor will pay for the product. Third-party payors may limit coverage to specific products on a formulary, which might not include all of the FDA-approved products for a particular indication. Third-party payors are increasingly challenging the price, examining the medical necessity and reviewing the cost-effectiveness of medical products, therapies and services, in addition to questioning their safety and efficacy. Expensive pharmaco-economic studies may need to be conducted in order to demonstrate to payors the medical necessity and cost-effectiveness of product candidates, in addition to the costs required to obtain the FDA approvals. Product candidates may not be considered medically necessary or cost-effective. Competition to be included in such formularies often leads to downward pricing pressures. In particular, third-party payors may refuse to include a particular reference listed drug in their formularies or otherwise restrict patient access to a reference listed drug when a less costly generic equivalent or other alternative is available. Coverage and reimbursement policies for drug products can differ significantly from payor to payor as there is no uniform policy of coverage and reimbursement for drug products among third-party payors in the United States. Further, one payor’s determination to provide coverage for a product does not assure that other payors will also provide coverage for the product. Adequate third-party reimbursement may not be available to enable the maintenance of price levels sufficient to realize an appropriate return on investment in product development. There may also be significant delays in obtaining coverage and reimbursement as the process of determining coverage and reimbursement is often time-consuming and costly which will require us to provide scientific and clinical support for the use of our products to each payor separately, with no assurance that coverage or adequate reimbursement will be obtained. It is difficult to predict at this time what government authorities and third-party payors will decide with respect to coverage and reimbursement for our drug products. Additionally, we may develop, either by ourselves or with collaborators, companion or complementary diagnostic tests for our product candidates for certain indications. We, or our collaborators, if any, will be required to obtain coverage and reimbursement for these tests separate and apart from the coverage and reimbursement we seek for our product candidates, once approved.

The U.S. government, state legislatures and foreign governmental entities have shown significant interest in implementing cost containment programs to limit the growth of government-paid healthcare costs, including price controls, restrictions on reimbursement and coverage and requirements for substitution of generic products for branded prescription drugs. Adoption of government controls and measures and tightening of restrictive policies in jurisdictions with existing controls and measures, could exclude or limit our drugs products from coverage and limit payments for pharmaceuticals.

In addition, we expect that the increased emphasis on managed care and cost containment measures in the United States by third-party payors and government authorities to continue and will place 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 for which we receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

Human Capital Resources

As of December 31, 2023, we had 29 full-time employees. Of these employees, five held M.D. and/or Ph.D. degrees, and five were engaged in research, development and technical operations. From time to time, we also retain independent

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contractors and consultants to support our organization. None of our employees are represented by a labor union or covered by collective bargaining agreements, and we believe our relationship with our employees is good.

Our human capital resources objectives include, as applicable, identifying, recruiting, retaining, incentivizing and integrating our existing and additional employees. The principal purpose of our incentive share plan is to attract, retain and motivate selected employees, consultants and directors through the granting of incentive share-based compensation awards and cash-based performance bonus awards.

Facilities

We are a remote-first company, meaning that substantially all of our employees work remotely. As a result of this strategy, we do not maintain a corporate headquarters or lease any corporate facilities. We believe that our virtual arrangements are adequate to meet our needs for the immediate future, and that suitable space will be available in the future on commercially reasonable terms, should it be needed.

Legal Proceedings

From time to time, we may be involved in legal proceedings arising in the ordinary course of our business. We are not presently a party to any legal proceedings that, in the opinion of management, would have a material adverse effect on our business. Regardless of outcome, litigation can have an adverse impact on us due to defense and settlement costs, diversion of management resources, negative publicity and reputational harm, and other factors.

Corporate Information

Our principal executive offices are located at 101 Federal Street, Suite 1900, Boston, Massachusetts 02110 and our telephone number is (716) 371-1125. Our website address is www.elevationoncology.com. Information contained on or accessible through our website is not a part of this Annual Report.

Elevation Oncology, the Elevation logo and other trade names, trademarks or service marks of Elevation appearing in this Annual Report are the property of Elevation. Trade names, trademarks and service marks of other companies appearing in this Annual Report are the property of their respective holders.

Available Information

The following filings are available through the U.S. Securities and Exchange Commission (the “SEC”), which maintains an Internet site at www.sec.gov, and through our website as soon as reasonably practicable after we file them with the SEC: Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, as well as any amendments to such reports and all other filings pursuant to Section 13(a) or 15(d) of the Securities Act.

We will make available on our website www.elevationoncology.com, free of charge, copies of these reports and other information as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. The contents of the websites referred to above are not incorporated into this filing. Further, our references to the URLs for these websites are intended to be inactive textual references only.

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Item 1A. Risk Factors

Investing in our common stock involves a high degree of risk. Before making your decision to invest in shares of our common stock, you should carefully consider and read carefully all of the risks described below, together with the other information contained in this Annual Report, including our financial statements and the related notes and the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this Annual Report, before deciding whether to invest in our common stock. We cannot assure you that any of the events discussed below will not occur. These events could have a material and adverse impact on our business, financial condition, results of operations and prospects. Unless otherwise indicated, references to our business being harmed in these risk factors will include harm to our business, reputation, financial condition, results of operations, net revenue and future prospects. In such event, the trading price of our common stock could decline, and you could lose all or part of your investment. Additional risks and uncertainties not presently known to us or that we currently deem immaterial also may impair our business operations and the market price of our common stock. This Annual Report also contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result of factors that are described below and elsewhere in this Annual Report.

Risk Factor Summary

The following summarizes the most material risks that make an investment in our securities risky or speculative. If any of the following risks occur or persist, our business, financial condition and results of operations could be materially harmed and the price of our common stock could significantly decline.

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We have a limited operating history, which may make it difficult to evaluate the success of our business to date and to assess our future viability. We have incurred significant operating losses since our inception in 2019 and have not generated any revenue. We expect to incur continued losses for the foreseeable future and may never achieve or maintain profitability.

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We are highly dependent on the success of our lead product candidate, EO-3021. We have not completed clinical development or obtained regulatory approval for any product candidate. We may never obtain approval for EO-3021 or any other product candidate.

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If we experience delays or difficulties in enrolling patients in our ongoing or planned clinical trials, our receipt of necessary regulatory approval could be delayed or prevented.

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Adverse side effects or other safety risks associated with our product candidates could delay or preclude approval, cause us to suspend or discontinue clinical trials or abandon further development, limit the commercial profile of an approved product or result in significant negative consequences following marketing approval, if any.

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We have, and we may in the future, seek to engage in strategic transactions to acquire or in-license new products, product candidates or technologies. If we are unable to realize the benefits from such transactions, it may adversely affect our ability to develop and commercialize product candidates, negatively impact our cash position, increase our expenses and present significant distractions to our management.

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The development and commercialization of biological products are subject to extensive regulation, and we may not obtain regulatory approvals for any of our product candidates, on a timely basis or at all.

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If we are unable to successfully develop, validate, obtain regulatory approval of and commercialize companion or complementary diagnostic tests for our product candidates or any future product candidates that require or would benefit from such tests, or experience significant delays in doing so, we may not realize the full commercial potential of these product candidates.

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will not have sufficient quantities of our product candidates or products or such quantities at an acceptable cost or quality, which could delay, prevent or impair our development or commercialization efforts.

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The incidence and prevalence for target patient populations of our product candidates have not been established with precision. If the market opportunities for our product candidates are smaller than we estimate or if any approval that we obtain is based on a narrower definition of the patient population, then our revenue potential and ability to achieve profitability will be adversely affected.

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We face substantial competition, which may result in others discovering, developing or commercializing products before or more successfully than we do.

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We expect to significantly expand our development and regulatory capabilities as we grow our company, and as a result, we may encounter difficulties in managing our growth, which could disrupt our operations.

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If we or our licensors are unable to obtain and maintain sufficient patent protection for our product candidates, or if the scope of the patent protection is not sufficiently broad, third parties, including our competitors, could develop and commercialize products similar or identical to ours, and our ability to commercialize our product candidates may be adversely affected.

Risks related to our financial position and need for additional capital

Investment in drug development is a highly speculative undertaking and involves a substantial degree of risk. We commenced operations in 2019 and are a clinical-stage biologics company with a limited operating history. We have not yet commercialized any product, nor do we expect to generate revenue from sales of any products for several years, if at all. Consequently, there have been limited operations upon which you can evaluate our business, and predictions about our future success or viability may not be as cancer therapies. For the years ended December 31, 2023 and 2022, we had a net loss of $45.7 million and $95.1 million, respectively. As of December 31, 2023, we had an accumulated deficit of $196.0 million. We expect to continue to incur significant research and development and other expenses related to our ongoing operations, which we anticipate will result in net losses for at least the next several years.

Since our inception, we have focused substantially all of our efforts and financial resources on the licensing, acquisition and clinical development of EO-3021 and seribantumab. In January 2023, we announced a pipeline prioritization and realignment of resources to advance EO-3021 and other pipeline programs, and to pause further investment in the clinical development of seribantumab. We intend to pursue further development of seribantumab only in collaboration with a partner.

To date, we have funded our operations with proceeds from sales of shares of our convertible preferred stock, proceeds from the sale of common stock and warrants, and borrowings under loan agreements. As of December 31, 2023, our cash, cash equivalents and marketable securities were $83.1 million.

We expect to incur increasing levels of operating losses for the foreseeable future, particularly as we seek to advance EO-3021 and other product candidates through clinical development. Our prior losses, combined with expected future losses, have had, and will continue to have, an adverse effect on our stockholders’ equity and working capital. We expect to incur increasing research and development expenses in connection with our planned clinical trials for EO-3021 and the development of other product candidates we may choose to pursue. In addition, if we obtain marketing approval for any product candidate, we will incur significant sales, marketing and outsourced manufacturing expenses in connection with the commercialization of such product candidate. Since our IPO, we have incurred and will continue to incur additional costs associated with operating as a public company. As a result, we expect to continue to incur significant and increasing operating losses for the foreseeable future.

Our ability to become profitable depends upon our ability to generate revenue. To date, we have not generated any revenue and we do not know when, or if, we will generate any revenue. We do not expect to generate significant revenue

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unless and until we obtain marketing approval for, and begin to sell, a product candidate. Our ability to generate revenue and become profitable will depend on a number of factors, including, but not limited to, our ability to:

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initiate and successfully meet our clinical endpoints in our clinical trials for EO-3021 and our other product candidates;

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initiate and successfully complete all safety, pharmacokinetic and other registrational-enabling studies required to obtain U.S. and foreign marketing approval for EO-3021 and our other product candidates;

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initiate and complete successful later-stage clinical trials that meet their clinical endpoints;

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submit a BLA for EO-3021 and each of our other product candidates to the FDA that is filed by the FDA;

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obtain marketing approval for EO-3021 and our other product candidates;

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establish licenses, collaborations or strategic partnerships that may increase the value of our programs;

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successfully manufacture or contract with others to manufacture our product candidates;

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further develop seribantumab in collaboration with a partner;

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commercialize our product candidates, if approved, by building a sales force or entering into collaborations with third parties;

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obtain, maintain, protect and defend our intellectual property portfolio;

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achieve market acceptance of our product candidates with the medical community and with third-party payors; and

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attract, hire and retain additional administrative, clinical, regulatory and scientific personnel.

We are only in the preliminary stages of most of these activities. We may never succeed in these activities and, even if we do, may never generate revenues that are significant enough to achieve profitability.

In cases where we are successful in obtaining regulatory approval to market our product candidates, our revenue will be dependent, in part, upon the size of the markets in the territories for which we gain regulatory approval, the accepted price for the product, the ability to obtain coverage and reimbursement, and whether we own the commercial rights for that territory. If the number of our addressable patients is significantly lower than we estimate, the indication approved by regulatory authorities is narrower than we expect, or the treatment population is narrowed by competition, physician choice or treatment guidelines, we may not generate significant revenue from sales of such products, even if they are approved.

Because of the numerous risks and uncertainties associated with drug development, we are unable to accurately predict the timing or amount of increased expenses we will incur and when, or if, we will be able to achieve profitability. If we decide to or are required by the FDA or regulatory authorities in other jurisdictions to perform studies or clinical trials in addition to those we currently anticipate, or if there are any delays in establishing appropriate manufacturing arrangements for, in initiating or completing our current and planned clinical trials for, or in the development of, our product candidates, our expenses could increase materially and our potential profitability could be further delayed.

Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Accordingly, you should not rely upon the results of any quarterly or annual periods as predictions or indications of future operating performance. We expect our financial condition and operating results to fluctuate from quarter-to-quarter and year-to-year due to a variety of factors, many of which are beyond our control. Our failure to become and remain profitable would decrease the value of our company and could impair our ability to raise capital, expand our business, maintain our research and development efforts, diversify our product offerings or even continue our operations. A decline in the value of our company could also cause you to lose all or part of your investment.

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We require substantial additional funding to pursue our business objectives. If we are unable to raise additional capital when needed or on terms acceptable to us, we could be forced to delay, reduce or terminate our research or drug development programs, any future commercialization efforts or other operations.

Identifying and developing potential product candidates and conducting preclinical studies and clinical trials is a time-consuming, expensive and uncertain process that takes years to complete, and we may never generate the necessary data or results required to obtain regulatory approval and begin selling any approved product. We expect to incur substantial expenses as we advance the clinical development of our product candidates and seek to develop, acquire or in-license additional product candidates. We expect increased expenses as we continue our research and development activities, initiate additional clinical trials and seek marketing approval for our product candidates. In addition, if we obtain marketing approval for any product candidate, we expect to incur significant commercialization expenses related to product manufacturing, marketing, sales and distribution. Furthermore, we have incurred, and expect to continue to incur, additional costs associated with operating as a public company. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations. Adequate additional financing may not be available to us on favorable terms, or at all.

In addition, we may seek additional capital due to favorable market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans. If we are unable to raise additional capital when needed or on favorable terms, we could be forced to delay, reduce or eliminate our research and development programs, our commercialization plans or other operations. In July 2022, we entered into the Sales Agreement with Cowen, pursuant to which we may offer and sell to or through Cowen acting as agent and/or principal, shares of our common stock having aggregate gross proceeds of up to $50.0 million. Under the Sales Agreement, Cowen may sell the shares by any method permitted by law and deemed to be an “at the market” (“ATM”) offering as defined in Rule 415 of the Securities Act or in other transactions pursuant to an effective shelf registration statement on Form S-3. Also in July 2022, we entered into the Loan Agreement with K2HV to provide up to $50.0 million principal amount in term loans.

We believe our cash, cash equivalents and marketable securities of $83.1 million as of December 31, 2023, together with the approximately $17.0 million in net proceeds raised under our ATM facility in January 2024, will enable us to meet our anticipated capital requirements into the fourth quarter of 2025. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect. Changes beyond our control may occur that would cause us to use our available capital before that time, including changes in and progress of our drug development activities and changes in government regulations. Our future capital requirements will depend on many factors, including:

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the progress, timing and results of preclinical studies and clinical trials for EO-3021 and our other product candidates;

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disruptions or delays in enrollment of our clinical trials;

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the extent to which we develop, in-license or acquire other product candidates or technologies;

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the number and development requirements of other future product candidates that we may pursue, and other indications for product candidates that we may pursue;

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the costs, timing and outcome of obtaining regulatory approvals of EO-3021 and our other product candidates and any companion or complementary diagnostics that we may pursue;

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the scope and costs of making arrangements with third-party manufacturers, or establishing manufacturing capabilities, for both clinical and commercial supplies of our product candidates;

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the costs involved in growing our organization to the size needed to allow for the research, development and potential commercialization of our current or future product candidates;

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the costs associated with commercializing any approved product candidates, including establishing sales, marketing and distribution capabilities;

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the costs associated with completing any post-marketing studies or trials required by the FDA or other regulatory authorities;

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the revenue, if any, received from commercial sales of our product candidates, if approved;

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the costs of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending intellectual property-related claims that we may become subject to, including any litigation costs and the outcome of such litigation;

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the costs associated with potential product liability claims, including the costs associated with obtaining insurance against such claims and with defending against such claims; and

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to the extent we pursue strategic collaborations, including collaborations to commercialize our product candidates or to develop any future product candidates, our ability to establish and maintain collaborations on favorable terms, if at all, as well as the timing and amount of any milestone or royalty payments that we are required to make or are eligible to receive under any such collaborations.

We require additional capital to complete our planned clinical development programs for our current product candidates to obtain regulatory approval. Our ability to raise additional funds will depend on financial, economic and market conditions and other factors over which we may have no or limited control, including financial institutions that may experience insolvency or financial distress similar to that experienced by Silicon Valley Bank and Signature Bank in March 2023. If adequate funds are not available on commercially acceptable terms when needed, we may be forced to delay, reduce or terminate the development or commercialization of our product candidates or we may be unable to take advantage of future business opportunities. Furthermore, any additional capital-raising efforts may divert our management from their day-to-day activities, which may adversely affect our ability to develop and commercialize our product candidates.

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

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a combination of equity offerings, debt financings, collaborations, strategic alliances and marketing, distribution or licensing arrangements. In addition, 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. To the extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect your rights as a common stockholder. 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 acquisitions or capital expenditures or declaring dividends.

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, 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 or other arrangements when needed, we may be required to delay, limit, reduce or terminate our research, product development or future commercialization efforts or grant rights to third parties to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Our loan and security agreement contains restrictive and financial covenants that may limit our operating flexibility.

Our Loan Agreement with K2HV is secured by a lien covering substantially all of our personal property, excluding intellectual property.

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maintain cash, cash equivalents and marketable securities balance of at least $25.0 million so long as our total market capitalization is less than $250.0 million.

The restrictions and covenants in the Loan Agreement, as well as those contained in any future debt financing agreements that we may enter into, may restrict our ability to finance our operations and engage in, expand or otherwise pursue our business activities and strategies. Our ability to comply with these covenants and restrictions may be affected by events beyond our control, and breaches of these covenants and restrictions could result in a default under the Loan Agreement and any future financing agreements that we may enter into.

Further, the interest rate of the Term Loan issued under the Loan Agreement is based on the published prime rate, a floating rate, subject to a minimum rate set in the Loan Agreement. The Federal Reserve has raised, and may in the future further raise, interest rates to combat the effects of recent high inflation. An increase in the prime rate above the set minimum rate would increase our debt service obligations, which could have a negative impact on our cash flow, financial position or operating results, or result in increased borrowing costs in the future.

Risks related to the design and development of our product candidates

Our future success is highly dependent on our ability to obtain regulatory approval for, and then successfully commercialize or identify a strategic partner to commercialize, our lead product candidate, EO-3021. We currently have no products that are approved for sale in any jurisdiction. Our product candidates may not achieve success in their clinical trials or obtain regulatory approval. If we do not obtain regulatory approval for our product candidates and successfully commercialize them in one or more indications or if we experience significant delays in doing so, we may never generate any revenue or become profitable.

Our ability to generate product revenues, which we do not expect will occur for many years, if ever, will depend heavily on the successful development and eventual commercialization of our product candidates. The success of our product candidates will depend on several factors, including the following:

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successful completion of preclinical studies and timely and successful enrollment of patients in, and completion of, clinical trials with favorable results;

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demonstration of safety, efficacy and acceptable risk-benefit profiles of our product candidates to the satisfaction of the FDA and other regulatory agencies;

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acceptance of an IND and a BLA by the FDA or other similar clinical trial applications by foreign regulatory authorities for clinical trials for our product candidates;

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our ability, or that of our collaborators, to develop and obtain clearance or approval of companion or complementary diagnostics, on a timely basis, or at all;

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receipt and related terms of marketing approvals from applicable regulatory authorities for our product candidates, including the completion of any required post-marketing studies or trials;

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raising additional funds necessary to complete the clinical development of and commercialization of our product candidates;

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successfully identifying and developing, acquiring or in-licensing additional product candidates to expand our pipeline;

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obtaining and maintaining patent, trade secret and other intellectual property protection and regulatory exclusivity for our product candidates, and protecting and enforcing our rights in our intellectual property portfolio;

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making arrangements with third-party manufacturers, or establishing manufacturing capabilities, for both clinical and commercial supplies of our product candidates;

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establishing sales, marketing and distribution capabilities and launching commercial sales of our products, if approved, whether alone or in collaboration with third parties;

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acceptance of our products, if approved, by patients, the medical community and third-party payors;

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effectively competing with other therapies available on the market or in development;

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obtaining and maintaining third-party payor coverage and adequate reimbursement; and

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maintaining a continued acceptable safety profile of any products following regulatory approval.

Many of these factors are beyond our control, and it is possible that none of our product candidates, including EO-3021, will ever obtain regulatory approval even if we expend substantial time and resources seeking such approval. If we experience significant delays or are otherwise unable to successfully commercialize our product candidates, it would materially harm our business.

Drug development is a lengthy and expensive process, and clinical testing is uncertain as to the outcome.

We have initiated a Phase 1 clinical trial of EO-3021, and the risk of failure is high for the development of EO-3021 and any of our other product candidates. We are unable to predict when or if our product candidates will prove effective and safe in humans or will obtain marketing approval. Before obtaining marketing approval from regulatory authorities for the sale of any product candidate, we must complete preclinical development and then conduct extensive clinical trials to demonstrate the safety and efficacy of our product candidate in humans. Clinical testing is expensive, difficult to design and implement, can take many years to complete and is uncertain as to the outcome.

A failure of one or more clinical trials can occur at any stage of testing. The outcomes of preclinical testing and early clinical trials may not be predictive of the success of later clinical trials or of clinical trials of the same product candidates in other indications, and interim or preliminary results of a clinical trial do not necessarily predict final results. There are no approved therapies targeting Claudin 18.2 and our anti-Claudin 18.2 ADC approach with EO-3021 may not result in a durable clinical outcome. In addition, while some results in patients, such as observations of stable disease, may suggest encouraging clinical activity with respect to a product candidate, we expect that stable disease would not be considered to be a sufficient response for regulatory approval purposes. Furthermore, we may observe adverse safety events in later trials that were not observed in prior trials, which would alter the anticipated risk-benefit profile of a product candidate and reduce the likelihood that it receives regulatory approval.

The standards that the FDA and its foreign counterparts use when regulating us require judgment and can change, which makes it difficult to predict with certainty their application. We may also encounter unexpected delays or increased costs due to new government regulations, for example, from future legislation or administrative action, or from changes in FDA policy during the period of product development, clinical trials and FDA regulatory review. It is impossible to predict whether legislative changes will be enacted, or whether FDA or foreign regulations, guidance or interpretations will be changed, or the impact of such changes, if any. For example, the Oncology Center of Excellence within the FDA has recently advanced Project Optimus, which is an initiative to reform the dose optimization and dose selection paradigm in oncology drug development to emphasize selection of an optimal dose, which is a dose or doses that maximizes not only the efficacy of a drug but the safety and tolerability as well. This shift from the prior approach, which generally determined the maximum tolerated dose, may require sponsors to spend additional time and resources to further explore a product candidate’s dose-response relationship to facilitate optimum dose selection in a target population. Other recent Oncology Center of Excellence initiatives have included Project FrontRunner, a new initiative with a goal of developing a framework for identifying candidate drugs for initial clinical development in the earlier advanced setting rather than for treatment of patients who have received numerous prior lines of therapies or have exhausted available treatment options, and Project Equity, which is an initiative to ensure that the data submitted to the FDA for approval of oncology medical products adequately reflect the demographic representation of patients for whom the medical products are intended. We are considering these and other policy changes as they relate to our programs.

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We may incur additional costs or experience delays in completing, or ultimately be unable to complete the development and/or commercialization of our product candidates.

Any delays in the commencement or completion of our ongoing, planned or future clinical trials could significantly increase our product development costs. We may experience numerous unforeseen events during, or as a result of, clinical trials that could delay or prevent our ability to obtain marketing approval or commercialize our product candidates, including:

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regulators, institutional review boards (“IRBs”), or ethics committees (“ECs”), may not authorize us or our investigators to commence a clinical trial or conduct a clinical trial at a prospective trial site;

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the FDA may disagree as to the design or implementation of our clinical trials or with our recommended doses with respect to any of our current or future product candidates;

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we may experience delays in reaching, or fail to reach, agreement on acceptable clinical trial contracts or clinical trial protocols with prospective contract research organizations (“CROs”) and prospective trial sites;

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clinical trials for our product candidates may produce negative or inconclusive results, and we may decide, or regulators may require us, to conduct additional clinical trials, delay or halt clinical trials or abandon product development programs;

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lack of adequate funding to continue clinical trials;

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the number of patients required for clinical trials may be larger than we anticipate, enrollment in these clinical trials may be slower than we anticipate or may be lower than we anticipate due to challenges in recruiting and enrolling suitable patients who meet the trial criteria, participants may drop out of these clinical trials at a higher rate than we anticipate or the duration of these clinical trials may be longer than we anticipate;

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competition for clinical trial participants from investigational and approved therapies may make it more difficult to enroll patients in our clinical trials;

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we may experience difficulties in maintaining contact with patients after treatment, resulting in incomplete data;

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we or third-party collaborators may fail to obtain regulatory approval of companion or complementary diagnostic tests, if required, on a timely basis, or at all;

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our third-party contractors may fail to meet their contractual obligations to us in a timely manner, or at all, or may fail to comply with regulatory requirements;

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we may have to suspend or terminate clinical trials for various reasons, including a finding by us or by a Data Monitoring Committee for a trial that the participants are being exposed to unacceptable health risks;

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our product candidates may have undesirable or unexpected side effects or other unexpected characteristics, causing us or our investigators, regulators or IRBs or ECs to suspend or terminate the trials;

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the cost of clinical trials may be greater than we anticipate;

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changes to clinical trial protocols; and

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the supply or quality of our product candidates or other materials necessary to conduct clinical trials may be insufficient or inadequate and result in delays or suspension of our clinical trials.

Delays, including delays caused by the above factors, can be costly and could negatively affect our ability to complete a clinical trial or obtain timely marketing approvals. We do not know whether any of our planned preclinical studies or clinical trials will begin on a timely basis or at all, will need to be restructured or will be completed on schedule, or at all. For example, the FDA may place a partial or full clinical hold on any of our clinical trials for a variety of reasons,

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including safety concerns and noncompliance with regulatory requirements. If we are not able to complete successful clinical trials, we will not be able to obtain regulatory approval and will not be able to commercialize EO-3021 or our other product candidates.

Significant preclinical or 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 would limit our future revenues and harm our commercial prospects.

If we experience delays or difficulties in enrolling patients in our ongoing or planned clinical trials, our receipt of necessary regulatory approval could be delayed or prevented.

We may not be able to initiate or continue our ongoing or planned clinical trials if we are unable to identify and enroll a sufficient number of eligible patients to participate in these trials as required by the FDA or comparable foreign regulatory authorities. In addition, some of our competitors currently have ongoing clinical trials for product candidates that would treat the same patients as our product candidates, and patients who would otherwise be eligible for our clinical trials may instead enroll in clinical trials of our competitors’ product candidates. Enrolling patients for our clinical trials requires promptly identifying cancer patients and placing these patients in one of our qualified sites in a timely manner. We have relied, and may in the future rely, on several diagnostic partners to conduct initial testing to identify patients that are eligible for our clinical trials. If one or more of these partners encounters delays or is otherwise unable to conduct these tests and identify potential patients, enrollment in our clinical trials may be substantially delayed. In addition, these partners work with several other companies, including our competitors, and may divert resources to collaborations with these other companies, which may detrimentally affect enrollment in our clinical trials. Patient enrollment is also affected by other factors, including:

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the severity of the disease under investigation;

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our ability to recruit clinical trial investigators of appropriate competencies and experience;

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the incidence and prevalence of our target indications;

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clinicians’ and patients’ awareness of testing mechanisms to screen patients and perceptions as to the potential advantages and risks of our product candidates in relation to other available therapies, including any new drugs that may be approved for the indications we are investigating;

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competing studies or trials with similar eligibility criteria;

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invasive procedures required to enroll patients and to obtain evidence of the product candidates’ performance during clinical trials;

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availability and efficacy of approved medications for the disease under investigation;

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eligibility criteria defined in the protocol for the trial in question;

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the size and nature of the patient population required for analysis of the trial’s primary endpoints;

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efforts to facilitate timely enrollment in clinical trials;

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whether we are subject to a partial or full clinical hold on any of our clinical trials;

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reluctance of physicians to encourage patient participation in clinical trials;

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the ability to monitor patients adequately during and after treatment;

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our ability to obtain and maintain patient consents; and

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proximity and availability of clinical trial sites for prospective patients.

Our inability to enroll and maintain a sufficient number of patients for our clinical trials would result in significant delays or may require us to abandon one or more clinical trials altogether. Enrollment delays in our clinical trials may result in increased development costs, which would cause the value of our company to decline, limit our ability to obtain additional financing and delay or limit our ability to obtain regulatory approval for our product candidates.

Results of our planned clinical trials of EO-3021 and our other product candidates could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics. For example, clinical trials evaluating anti-Claudin 18.2 ADCs, including those that use MMAE payloads, such as EO-3021, have reported adverse events of nausea, vomiting, neutropenia, peripheral neuropathy and ocular toxicity. Undesirable side effects could result in the delay, suspension or termination of clinical trials by us or regulatory authorities for a number of reasons. Furthermore, clinical trials by their nature utilize a sample of the potential patient population. With a limited number of subjects and limited duration of exposure, rare and severe side effects of our product candidates or those of our competitors may only be uncovered with a significantly larger number of patients exposed to the drug.

Additionally, due to the high mortality rates of the cancers for which we are initially pursuing development, a material percentage of patients in these clinical trials may die during a trial. If we elect to, or are required to, delay, suspend or terminate any clinical trial, whether due to a patient death or otherwise, the commercial prospects of EO-3021 or our other product candidates will be harmed and our ability to generate product revenues will be delayed or eliminated. Any serious adverse events observed in clinical trials could hinder or prevent market acceptance of our product candidates, which would harm our commercial prospects, our financial condition and our reputation.

Moreover, if any of our product candidates is associated with undesirable or unexpected side effects in clinical trials, we may elect to abandon or limit their development to more narrow uses or subpopulations in which the undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective, which may limit the commercial expectations for the product candidate, even if it is approved. We may also be required to modify our trial plans based on findings in our clinical trials. Side effects could also affect patient recruitment or the ability of enrolled patients to complete a trial. Many drugs that initially showed promise in early-stage testing have later been found to cause side effects that prevented further development. In addition, regulatory authorities may draw different conclusions, require additional testing to confirm these determinations, require more restrictive labeling or deny regulatory approval of the product candidate.

It is possible that, as we test our product candidates in larger, longer and more extensive clinical trials, including with different dosing regimens, or as the use of our product candidates becomes more widespread following any regulatory approval, illnesses, injuries, discomforts and other adverse events that were observed in earlier trials, as well as conditions that did not occur or went undetected in previous trials, will be reported by patients. If such side effects become known later in development or upon approval, if any, such findings may harm our business, financial condition, results of operations and prospects significantly.

In addition, if any of our product candidates receives marketing approval, and we or others later identify undesirable side effects caused by treatment with such drug, a number of potentially significant negative consequences could result, including:

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regulatory authorities may withdraw approval of the drug;

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

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regulatory authorities may require additional warnings in the labeling, such as a contraindication or a boxed warning, or issue safety alerts, Dear Healthcare Provider letters, press releases or other communications containing warnings or other safety information about the product;

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we may be required to implement a risk evaluation and mitigation strategy (“REMS”), or create a medication guide outlining the risks of such side effects for distribution to patients;

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additional restrictions may be imposed on the marketing or promotion of the particular product or the manufacturing processes for the product or any component thereof;

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

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we may be subject to regulatory investigations and government enforcement actions;

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the drug could become less competitive; and

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our reputation may suffer.

Any of these events could prevent us from achieving or maintaining market acceptance of our product candidates, if approved, and could significantly harm our business, financial condition, results of operations and prospects.

Preliminary, topline and interim data from our clinical trials that we announce or publish from time to time may change as more patient data becomes available and is subject to audit and verification procedures that could result in material changes in the final data.

From time to time, we may publicly disclose preliminary or topline data or pre-specified interim analyses from our clinical trials. These updates will be based on an analysis of then-available data, and the results and related findings and conclusions are subject to change following a more comprehensive review of the data related to the particular study or trial. Additionally, pre-specified interim analyses from clinical trials that we may complete are subject to the risk that one or more of the clinical outcomes may materially change as patient enrollment continues and more patient data becomes available. Therefore, positive preliminary or interim results in any ongoing clinical trial may not be predictive of such results in the completed study or trial. We also make assumptions, estimations, calculations and conclusions as part of our analyses of data, and we may not have received or had the opportunity to fully and carefully evaluate all data. As a result, any topline results that we report may differ from future results of the same studies, or different conclusions or considerations may qualify such results, once additional data has been received and fully evaluated. Topline data also remains subject to audit and verification procedures that may result in the final data being materially different from the preliminary data we previously published. As a result, topline data should be viewed with caution until the final data is available. In addition, we may report interim analyses of only certain endpoints rather than all endpoints. Adverse changes between preliminary or interim data and final data could significantly harm our business and prospects. Further, additional disclosure of interim data by us or by our competitors in the future could result in volatility in the price of our common stock. See the description of risks under the heading “Risks Related to our Common Stock” for more disclosure related to the risk of volatility in our stock price.

Further, others, including regulatory agencies, may not accept or agree with our assumptions, estimates, calculations, conclusions or analyses or may interpret or weigh the importance of data differently, which could impact the value of the particular program, the approvability or commercialization of the particular product candidate or product and our company in general. In addition, the information we choose to publicly disclose regarding a particular study or clinical trial is typically selected from a more extensive amount of available information. Third parties may not agree with what we determine is the material or otherwise appropriate information to include in our disclosure, and any information we determine not to disclose may ultimately be deemed significant with respect to future decisions, conclusions, views, activities or otherwise regarding a particular product, product candidate or our business.

Additionally, planned clinical trials we conduct may be open-label trials in which both the patient and investigator know whether the patient is receiving the investigational product candidate or either an existing approved product or placebo. Open-label clinical trials typically test only the investigational product candidate and sometimes may do so at different dose levels. Open-label clinical trials are subject to various limitations that may exaggerate any therapeutic effect as patients in open-label clinical trials are aware when they are receiving treatment. Open-label clinical trials may be subject to a “patient bias” where patients perceive their symptoms to have improved merely due to their awareness of receiving an experimental treatment. In addition, open-label clinical trials may be subject to an “investigator bias” where those assessing and reviewing the physiological outcomes of the clinical trials are aware of which patients have received treatment and may interpret the information of the treated group more favorably given this knowledge.

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If the preliminary or topline data or results of pre-specified interim analyses that we report differs from late, final or actual results, or if others, including regulatory authorities, disagree with the conclusions reached, our ability to obtain approval for, and commercialize, our product candidates may be harmed.

We have, and we may in the future, seek to engage in strategic transactions to acquire or in-license new products, product candidates or technologies, or partner or out-license our product candidates. If we are unable to realize the benefits from such transactions, it may adversely affect our ability to develop and commercialize product candidates, negatively impact our cash position, increase our expenses and present significant distractions to our management.

From time to time, we may consider strategic transactions, such as additional collaborations, acquisitions of companies, asset purchases, joint ventures, in-licensing of new products, product candidates or technologies, and partnering or out-licensing our product candidates, that we believe will complement or augment our existing business. For example, in July 2022, we entered into a license agreement pursuant to which CSPC granted us exclusive rights to develop and commercialize EO-3021 worldwide outside of Greater China. If we acquire additional assets with promising markets or technologies, we may not be able to realize the benefit of acquiring such assets if we are not able to successfully integrate them with our existing technologies. We may encounter numerous difficulties in developing, testing, manufacturing and marketing any new products resulting from a strategic acquisition that delay or prevent us from realizing their expected benefits or enhancing our business. Even if we partner or out-license seribantumab, we may not be able to realize any benefit of the transaction and collaboration, financial or otherwise.

Following any strategic transaction, we may not achieve any expected synergies to justify the transaction. For example, such transactions may require us to incur non-recurring or other charges, increase our near-term and long-term expenditures and pose significant integration or implementation challenges or disrupt our management or business. These transactions would entail numerous operational and financial risks, including, but not limited to, exposure to unknown liabilities, disruption of our business and diversion of our management’s time and attention in order to manage a collaboration or develop acquired products, product candidates or technologies, incurrence of substantial debt or dilutive issuances of equity securities to pay transaction consideration or costs, higher than expected acquisition or integration costs, write-downs of assets or goodwill or impairment charges, increased amortization expenses, difficulty and cost in facilitating the transaction or combining the operations and personnel of any acquired business, impairment of relationships with key suppliers, manufacturers or customers of any acquired business due to changes in management and ownership and the inability to retain key employees of any acquired business.

Accordingly, although there can be no assurance that we will undertake or successfully complete any transactions of the nature described above, any transactions that we do complete may be subject to the foregoing or other risks and could have a material and adverse effect on our business, financial condition, results of operations and prospects. Conversely, any failure to enter any strategic transaction that would be beneficial to us could delay the development and potential commercialization of our product candidates and could have a negative impact on the competitiveness of any product candidate that reaches market.

We may not be successful in finding collaborators for continuing the development of seribantumab.

We have paused further investment in the clinical development of seribantumab, intend to pursue further clinical development of seribantumab only in collaboration with a partner. We face significant competition in seeking appropriate collaborators. Any such collaboration may be on terms that are not optimal for us, and we may not be able to maintain any new collaboration. Collaborations are complex and time-consuming to negotiate and document. In addition, a significant number of recent business combinations among large pharmaceutical companies has resulted in a reduced number of potential future collaborators. Whether we reach a definitive agreement for a collaboration will depend, among other things, upon our assessment of the collaborator’s resources and expertise, the terms and conditions of the proposed collaboration and the proposed collaborator’s evaluation of a number of factors. Those factors may include the design or results of clinical trials, the likelihood of approval by the FDA or similar regulatory authorities outside the United States, the potential market for the subject product candidate, the costs and complexities of manufacturing and delivering such product candidate to patients, the potential of competing drugs, the existence of uncertainty with respect to our ownership of technology, which can exist if there is a challenge to such ownership without regard to the merits of the challenge and industry and market conditions generally. The collaborator may also consider alternative product candidates or technologies for similar indications that may be available to collaborate on and whether such a collaboration could be more attractive than the one with us for our product candidate. The terms of any additional collaborations or other arrangements that we may establish may not be favorable to us.

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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 and managerial resources, we focus on research programs and product candidates that we identify for specific indications. As a result, we may forego or delay pursuit of opportunities with other future product candidates or for other indications that later prove to have greater commercial potential. For example, in January 2023, we announced a pipeline prioritization and realignment of resources to advance EO-3021.

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 products. 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 that product candidate.

We expect to conduct clinical trials for our product candidates outside the United States, and the FDA or comparable foreign regulatory authorities may not accept data from such trials.

We expect to conduct one or more clinical trials outside the United States. The acceptance of trial data from clinical trials conducted outside the United States or another jurisdiction by the FDA or comparable regulatory authorities may be subject to certain conditions or may not be accepted at all. In cases where data from clinical trials conducted outside the United States is intended to serve as the basis for marketing approval in the United States, the FDA will generally not approve the application on the basis of these data alone unless the data is applicable to the U.S. population and U.S. medical practice, including availability of drugs as standard of care, and the trials were performed by clinical investigators of recognized competence and pursuant to GCP regulations. Additionally, the FDA’s clinical trial requirements, including sufficient size of patient populations and statistical powering, must be met. Many other regulatory authorities have similar approval requirements. In addition, such trials would be subject to the applicable local laws of the respective jurisdictions where the trials are conducted. There can be no assurance that the FDA, EMA or any comparable regulatory authority will accept data from trials conducted outside of the United States or the applicable jurisdiction. If the FDA, EMA or any comparable regulatory authority does not accept such data, it would result in the need for additional trials, which would be costly and time-consuming and delay aspects of our business plan, and which may result in product candidates that we may develop not receiving approval for commercialization in the applicable jurisdiction.

This lengthy approval process, as well as the unpredictability of the results of clinical trials, may result in our failing to obtain regulatory approval to market any of our product candidates, which would significantly harm our business, results of operations, and prospects.

Risks related to government regulation

The clinical development, manufacturing, labeling, packaging, storage, recordkeeping, advertising, promotion, export, import, marketing, distribution, adverse event reporting, including the submission of safety, and other post-marketing information and reports, and other possible activities relating to our product candidates, are subject to extensive regulation. Marketing approval of biologics in the United States requires the submission of a BLA to the FDA, and we are not permitted to market any product candidate in the United States until we obtain approval from the FDA of the BLA for that product. A BLA must be supported by extensive clinical and preclinical data, as well as extensive information regarding pharmacology, chemistry, manufacturing and controls. Our product candidates must also be approved by comparable regulatory authorities in other jurisdictions prior to commercialization in those jurisdictions.

FDA approval of a BLA is not guaranteed, and the review and approval process is an expensive and uncertain process that may take several years. Of the large number of drugs in development in the United States, only a small percentage will successfully complete the FDA regulatory approval process and will be commercialized. Accordingly, there can be no assurance that any of our product candidates will receive regulatory approval in the United States, or other jurisdictions. Most applications for standard review biologic products are reviewed within 10 to 12 months; most

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applications for priority review biologics are reviewed in six to eight months. Priority review can be applied to biologics that the FDA determines may offer significant improvement in safety or effectiveness compared to marketed products or where no adequate therapy exists. The review process for both standard and priority review may be extended by the FDA for three additional months to consider certain late-submitted information, or information intended to clarify information already provided in the submission. The FDA does not always meet its goal dates for standard and priority BLAs, and the review process can be extended by FDA requests for additional information or clarification.

The FDA also has substantial discretion in the approval process. The number and types of preclinical studies and clinical trials that will be required for BLA approval varies depending on the product candidate, the disease or the condition that the product candidate is designed to treat and the regulations applicable to any particular product candidate. In addition, development programs that span many tumor types are relatively novel, and, to date, the FDA has approved only a handful of therapies to treat multiple tumor types based on a common biomarker. We cannot be sure that the FDA will accept our BLA for EO-3021 or our other product candidates. Further, depending upon the results of our planned clinical trials, we may choose to seek Subpart H accelerated approval for a product candidate, which would require completion of a confirmatory trial to validate its clinical benefit. Despite the time and expense associated with preclinical studies and clinical trials, failure can occur at any stage. The results of preclinical and early clinical trials of our product candidates may not be predictive of the results of our later-stage clinical trials.

Clinical trial failure may result from a multitude of factors including flaws in trial design, dose selection, patient enrollment criteria and failure to demonstrate favorable safety or efficacy traits, and failure in clinical trials can occur at any stage. Companies in the biologics industry frequently suffer setbacks in the advancement of clinical trials due to lack of efficacy or adverse safety profiles, notwithstanding promising results in earlier trials. Based upon negative or inconclusive results, we may decide, or regulators may require us, to conduct additional clinical trials or preclinical studies. In addition, data obtained from clinical trials is susceptible to varying interpretations, and regulators may not interpret our data as favorably as we do, which may further delay, limit or prevent marketing approval.

The FDA could delay, limit or deny approval of a product candidate for many reasons, including because the FDA:

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may not deem our product candidate to be safe and effective;

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determines that the product candidate does not have an acceptable benefit-risk profile;

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determines in the case of a BLA seeking accelerated approval that the BLA does not provide evidence that the product candidate represents a meaningful advantage over available therapies for each tumor type;

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determines that the objective response rate (“ORR”), and duration of response are not clinically meaningful;

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determines that a tissue agnostic indication is not appropriate, for example, because a consistent anti-tumor effect is not observed across multiple tumor types or the response is too heavily weighted on a specific tumor type;

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may not agree that the data collected from preclinical studies and clinical trials are acceptable or sufficient to support the submission of a BLA or other submission or to obtain regulatory approval, and may impose requirements for additional preclinical studies or clinical trials;

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may determine that adverse events experienced by participants in our clinical trials represent an unacceptable level of risk;

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may determine that the population studied in the clinical trial may not be sufficiently broad or representative to assure safety in the full population for which we seek approval;

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may not accept clinical data from trials, which are conducted at clinical facilities or in countries where the standard of care is potentially different from that of the United States;

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may disagree regarding the formulation, labeling and/or specifications;

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may not approve the manufacturing processes associated with our product candidate or may determine that a manufacturing facility does not have an acceptable compliance status;

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may change approval policies or adopt new regulations; or

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may not file a submission due to, among other reasons, the content or formatting of the submission.

We have not obtained FDA approval for any product. This lack of experience may impede our ability to obtain FDA approval in a timely manner, if at all, for our product candidates.

If we experience delays in obtaining approval or if we fail to obtain approval of any product candidate, our commercial prospects will be harmed and our ability to generate revenues will be materially impaired.

The accelerated approval pathway for any of our product candidates may not lead to a faster development or regulatory review or approval process and does not increase the likelihood that it will receive marketing approval.

Under the FDA’s accelerated approval program, the FDA may approve a drug or biologic for a serious or life-threatening illness that provides meaningful therapeutic benefit to patients over existing treatments based upon a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity, or prevalence of the condition and the availability or lack of alternative treatments. We may seek accelerated approval for a product candidate on the basis of ORR with an acceptable duration of response, a surrogate endpoint that we believe is reasonably likely to predict clinical benefit. Whether the ORR we observe in our planned clinical trials will be adequate to support an accelerated approval for any of our product candidates will depend on a number of factors, including the response rate, the durability of the responses, the observed toxicity profile and prior therapies received. This analysis may be complicated by whether there is an available therapy against which to compare our product candidates for certain tumor types based on the patients we enroll.

For drugs or biologics granted accelerated approval, post-marketing confirmatory trials are required to describe the anticipated effect on irreversible morbidity or mortality or other clinical benefit. These confirmatory trials must be completed with due diligence and, in some cases, the FDA may require that the trial be designed, initiated and/or fully enrolled prior to approval. If standard of care were to evolve or if any of our competitors were to receive full approval on the basis of a confirmatory trial for an indication for which we are seeking accelerated approval before we receive accelerated approval, the indication we are seeking may no longer qualify as a condition for which there is an unmet medical need and accelerated approval of our product candidate would not occur without a showing of benefit over available therapy.

Many cancer therapies rely on accelerated approval, and the treatment landscape can change quickly as the FDA converts accelerated approvals to full approvals on the basis of successful confirmatory trials. In addition, the FDA may terminate the accelerated approval program or change the standards under which accelerated approvals are considered and granted in response to public pressure or other concerns regarding the accelerated approval program. Changes to or termination of the accelerated approval program could prevent or limit our ability to obtain accelerated approval of any of our clinical development programs. Recently, the accelerated approval pathway has come under scrutiny within the FDA and by Congress. The FDA has put increased focus on ensuring that confirmatory studies are conducted with diligence and, ultimately, that such studies confirm the benefit. For example, the FDA has convened its Oncologic Drugs Advisory Committee to review what the FDA has called dangling or delinquent accelerated approvals where confirmatory studies have not been completed or where results did not confirm benefit. Congress is also considering various proposals to potentially make changes to the accelerated approval pathway, including proposals to increase the likelihood of withdrawal of approval in such circumstances. In addition, the Oncology Center of Excellence has announced Project Confirm, which is an initiative to promote the transparency of outcomes related to accelerated approvals for oncology indications and provide a framework to foster discussion, research and innovation in approval and post-marketing processes, with the goal to enhance the balance.

The enactment of FDORA included provisions related to the accelerated approval pathway. Pursuant to FDORA, the FDA is authorized to require a post-approval study to be underway prior to approval or within a specified time period following approval. FDORA also requires the FDA to specify conditions of any required post-approval study and

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requires sponsors to submit progress reports for required post-approval studies and any conditions required by the FDA. FDORA enables the FDA to initiate enforcement action for the failure to conduct with due diligence a required post-approval study, including a failure to meet any required conditions specified by the FDA or to submit timely reports.

Moreover, the FDA may withdraw approval of our product candidate approved under the accelerated approval pathway if, for example:

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the trial or trials required to verify the predicted clinical benefit of our product candidate fail to verify such benefit or do not demonstrate sufficient clinical benefit to justify the risks associated with the candidate;

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other evidence demonstrates that our product candidate is not shown to be safe or effective under the conditions of use;

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we fail to conduct any required post-approval trial of our product candidate with due diligence; or

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we disseminate false or misleading promotional materials relating to the relevant product candidate.

Our failure to obtain marketing approval in jurisdictions outside the United States would prevent our product candidates from being marketed in those jurisdictions, and any approval we are granted for it in the United States would not assure approval in other jurisdictions.

In order to market and sell our products in any jurisdiction outside the United States, we must obtain separate marketing approvals and comply with numerous and varying regulatory requirements. The approval procedure varies among countries and can involve additional testing. 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, if at all. 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. We may not be able to submit for marketing approvals and may not receive necessary approvals to commercialize our products in any market, which would impair our financial prospects.

We may not be able to obtain or maintain orphan drug designation or exclusivity for our product candidates.

Regulatory authorities in some jurisdictions, including the United States, may designate drugs for relatively small patient populations as “orphan drugs.” Under the Orphan Drug Act, the FDA may designate a drug as an orphan drug if it is intended to treat a rare disease or condition, which is generally defined as a patient population of fewer than 200,000 individuals in the United States, or if the disease or condition affects more than 200,000 individuals in the United States and there is no reasonable expectation that the cost of developing the drug for the type of disease or condition will be recovered from sales of the product in the United States.

Orphan drug designation entitles a party to financial incentives, such as tax advantages and user fee waivers. Additionally, if a product that has orphan designation subsequently receives the first FDA approval for the disease or condition for which it has such designation, the product is entitled to orphan drug exclusivity, which means that the FDA may not approve any other applications to market the same drug for the same indication for seven years, except in certain circumstances, such as a showing of clinical superiority (i.e., another product is safer, more effective or makes a major contribution to patient care) over the product with orphan exclusivity or where the manufacturer is unable to assure sufficient product quantity. Competitors, however, may receive approval of different products for the same indication for which the orphan product has exclusivity, or obtain approval for the same product but for a different indication than that for which the orphan product has exclusivity.

The FDA has granted orphan drug designation in the United States to EO-3021 for the treatment of gastric cancer (including cancer of gastroesophageal junction) and for the treatment of pancreatic cancer. We may apply for an additional orphan drug designation in the United States or other geographies for EO-3021 or our other product candidates. However, obtaining an orphan drug designation can be difficult, and we may not be successful in doing so. For instance, in the case of a request for orphan drug designation for a tumor agnostic indication, preliminary findings of

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a product candidate’s treatment effect that is not observed across multiple tumor types or that is too heavily weighted on a specific tumor type may not be sufficient for the FDA to grant a tumor agnostic orphan drug designation. Even if we obtain orphan drug designation for a product candidate in specific indications, we may not be the first to obtain regulatory approval of the product candidate for the orphan-designated indication, due to the uncertainties associated with developing biological products. In addition, exclusive marketing rights in the United States may be limited if we seek approval for an indication broader than the orphan-designated indication or may be lost if the FDA later determines that the request for orphan designation was materially defective or if the manufacturer is unable to assure sufficient quantities of the product to meet the needs of patients with the rare disease or condition. Orphan drug designation does not ensure that we will receive marketing exclusivity in a particular market, and we cannot assure you that any future application for orphan drug designation in any other geography or with respect to any other future product candidate will be granted. Orphan drug designation neither shortens the development time or regulatory review time of a drug, nor gives the drug any advantage in the regulatory review or approval process.

A Breakthrough Therapy designation by the FDA for any of our product candidates may not lead to a faster development or regulatory review or approval process, and it would not increase the likelihood that the product candidate will receive marketing approval.

We may seek a Breakthrough Therapy designation for EO-3021 or our other product candidates. A breakthrough therapy is defined as a drug or biologic that is intended, alone or in combination with one or more other drugs, to treat a serious or life-threatening disease or condition, and preliminary clinical evidence indicates that the drug may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. For drugs that have been designated as breakthrough therapies, interaction and communication between the FDA and the sponsor of the trial can help to identify the most efficient path for clinical development while minimizing the number of patients placed in ineffective control regimens. Drugs designated as breakthrough therapies by the FDA are also eligible for priority review if supported by clinical data at the time of the submission of the BLA.

Designation as a breakthrough therapy is at the discretion of the FDA. Accordingly, even if we believe that a product candidate meets the criteria for designation as a breakthrough therapy, the FDA may disagree and instead determine not to make such designation. In any event, the receipt of a Breakthrough Therapy designation for a drug may not result in a faster development process, review, or approval compared to drugs considered for approval under conventional FDA procedures and it would not assure ultimate approval by the FDA. In addition, even if the product candidate qualifies as a breakthrough therapy, the FDA may later decide that the product candidate no longer meets the conditions for qualification or that the time period for FDA review or approval will not be shortened.

A Fast Track designation by the FDA for any of our product candidates may not lead to a faster development or regulatory review or approval process.

We may seek Fast Track designation for EO-3021 or our other product candidates. If a drug or biologic is intended for the treatment of a serious or life-threatening condition and the drug demonstrates the potential to address unmet medical needs for this condition, the product sponsor may apply for FDA Fast Track designation. The FDA has broad discretion whether to grant this designation, so even if we believe a particular product candidate is eligible for this designation, we cannot assure you that the FDA would decide to grant it. Even if we do receive Fast Track designation for a particular product candidate, we may not experience a faster development process, review or approval compared to conventional FDA procedures. The FDA may withdraw Fast Track designation if it believes that the designation is no longer supported by data from our clinical development program.

If we are unable to successfully develop, validate, obtain regulatory approval of and commercialize companion or complementary diagnostic tests for product candidates that require or would benefit from such tests, or experience significant delays in doing so, we may not realize the full commercial potential of these product candidates.

A companion diagnostic is a medical device, often an in vitro device, which provides information that is essential for the safe and effective use of a corresponding therapeutic drug or biologic product. A companion or complementary diagnostic can be used to identify patients who are most likely to benefit from the therapeutic product.

A companion or complementary diagnostic is generally developed in conjunction with the clinical program for an associated therapeutic product. To date, the FDA has generally required premarket approval of companion and

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complementary diagnostics for cancer therapies. Generally, when a companion diagnostic is essential to the safe and effective use of a drug product, the FDA requires that the companion diagnostic be approved before or concurrent with approval of the therapeutic product and before a product can be commercialized. The approval of a companion diagnostic as part of the therapeutic product’s labeling limits the use of the therapeutic product to only those patients who express the specific genetic alteration that the companion diagnostic was developed to detect. However, it is possible that the FDA may permit approval of the companion diagnostic as a post-marketing commitment following a potential regulatory approval.

Development of a companion or complementary diagnostic could include additional meetings with regulatory authorities, such as a pre-submission meeting and the requirement to submit an investigational device exemption application. In the case of a companion diagnostic that is designated as “significant risk device,” approval of an investigational device exemption by the FDA and IRB is required before such diagnostic is used in conjunction with the clinical trials for a corresponding product candidate.

To be successful in developing, validating, obtaining approval of and commercializing a companion or complementary diagnostic, we or our collaborators will need to address a number of scientific, technical, regulatory and logistical challenges. We have no prior experience with medical device or diagnostic test development. If we choose to develop and seek FDA approval for companion or complementary diagnostic tests on our own, we will require additional personnel. We may rely on third parties for the design, development, testing, validation and manufacture of companion or complementary diagnostic tests for our therapeutic product candidates that require such tests, the application for and receipt of any required regulatory approvals, and the commercial supply of these companion or complementary diagnostics. If these parties are unable to successfully develop companion or complementary diagnostics for these therapeutic product candidates, or experience delays in doing so, we may be unable to enroll enough patients for our current and planned clinical trials, the development of these therapeutic product candidates may be adversely affected, these therapeutic product candidates may not obtain marketing approval, and we may not realize the full commercial potential of any of these therapeutics that obtain marketing approval. For any product candidate for which a companion diagnostic is necessary to select patients who may benefit from use of the product candidate, any failure to successfully develop a companion diagnostic may cause or contribute to delayed enrollment of our clinical trials, and may prevent us from initiating a pivotal trial. In addition, the commercial success of any product candidate that requires a companion diagnostic will be tied to and dependent upon the receipt of required regulatory approvals and the continued ability of such third parties to make the companion diagnostic commercially available to us on reasonable terms in the relevant geographies. Any failure to do so could materially harm our business, results of operations and financial condition.

Even if we obtain marketing approval for a product candidate, the terms of approvals, ongoing regulation of our products or other post-approval restrictions may limit how we manufacture and market our products and compliance with such requirements may involve substantial resources, which could materially impair our ability to generate revenue.

Any product candidates for which we receive accelerated approval from the FDA are required to undergo one or more confirmatory clinical trials. If such a product candidate fails to meet its safety and efficacy endpoints in such confirmatory clinical trials, the regulatory authority may withdraw its conditional approval. There is no assurance that any such product will successfully advance through its confirmatory clinical trial(s). Therefore, even if a product candidate receives accelerated approval from the FDA, such approval may be withdrawn at a later date.

Even if marketing approval of a product candidate is granted, an approved product and its manufacturer and marketer are subject to ongoing review and extensive regulation, which may include the requirement to implement a REMS or to conduct costly post-marketing studies or clinical trials and surveillance to monitor the safety or efficacy of the product.

We must also comply with requirements concerning advertising and promotion for our product candidates for which we obtain marketing approval. Promotional communications with respect to prescription drugs or biologics are subject to a variety of legal and regulatory restrictions and must be consistent with the information in the product’s approved labeling. Thus, we will not be able to promote any products we develop for indications or uses for which they are not approved.

In addition, manufacturers of approved products and those manufacturers’ facilities are required to ensure that quality control and manufacturing procedures conform to current good manufacturing practices (“cGMPs”), which include requirements relating to quality control and quality assurance as well as the corresponding maintenance of records and

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documentation and reporting requirements. We and our contract manufacturing organizations (“CMOs”) will be subject to periodic unannounced inspections by the FDA to monitor and ensure compliance with cGMPs.

Accordingly, even if we obtain marketing approval for a product candidate, we and our CMOs will continue to expend time, money and effort in all areas of regulatory compliance, including manufacturing, production, product surveillance and quality control. If we are not able to comply with post-approval regulatory requirements, we could have the marketing approvals for our products withdrawn by regulatory authorities and our ability to market any future products could be limited, which could adversely affect our ability to achieve or sustain profitability. As a result, the cost of compliance with post-approval regulations may have a negative effect on our operating results and financial condition.

Any product candidate for which we obtain marketing approval will be subject to ongoing enforcement of post-marketing requirements by regulatory agencies, and we could be subject to substantial penalties, including withdrawal of our product from the market, if we fail to comply with all regulatory requirements or if we experience unanticipated problems with our products, when and if any of them are approved.

Any product candidate for which we obtain marketing approval, along with the manufacturing processes, post-approval clinical data, labeling, advertising and promotional activities for such product, will be subject to continual requirements of and review by the FDA and other regulatory authorities. These requirements include, but are not limited to, restrictions governing promotion of an approved product, submissions of safety and other post-marketing information and reports, registration and listing requirements, cGMP requirements relating to manufacturing, quality control, quality assurance and corresponding maintenance of records and documents, and requirements regarding drug distribution and the distribution of samples to physicians and recordkeeping.

The FDA and other federal and state agencies, including the Department of Justice, closely regulate compliance with all requirements governing prescription drug and biologic products, including requirements pertaining to their marketing and promotion in accordance with the provisions of the approved labeling and manufacturing of products in accordance with cGMP requirements. For example, the FDA and other agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses, and a company that is found to have improperly promoted off-label uses may be subject to significant liability. Violations of such requirements may lead to investigations alleging violations of the FDC Act and other statutes, including the False Claims Act and other federal and state healthcare fraud and abuse laws as well as state consumer protection laws. Our failure to comply with all regulatory requirements, and later discovery of previously unknown adverse events or other problems with our products, manufacturers or manufacturing processes, may yield various results, including:

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litigation involving patients taking our products;

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restrictions on such products, manufacturers or manufacturing processes;

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restrictions on the labeling or marketing of a product;

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restrictions on product distribution or use;

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requirements to conduct post-marketing studies or clinical trials;

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warning or untitled letters;

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withdrawal of the products from the market;

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refusal to approve pending applications or supplements to approved applications that we submit;

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recall of products;

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fines, restitution or disgorgement of profits or revenues;

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suspension or withdrawal of marketing approvals;

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damage to relationships with any potential collaborators;

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unfavorable press coverage and damage to our reputation;

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refusal to permit the import or export of our products;

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product seizure; or

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injunctions or the imposition of civil or criminal penalties.

Non-compliance by us or any future collaborator with regulatory requirements, including safety monitoring or pharmacovigilance, and with requirements related to the development of products for the pediatric population can also result in significant financial penalties.

Our current and future relationships with customers and third-party payors may be subject to applicable anti-kickback, fraud and abuse, transparency, health privacy, and other healthcare laws and regulations, which could expose us to significant penalties, including criminal, civil, and administrative penalties, contractual damages, reputational harm and diminished profits and future earnings.

Healthcare providers, including physicians, and third-party payors will play a primary role in the recommendation and prescription of any product candidates for which we obtain marketing approval. Our current and future arrangements with healthcare providers, third-party payors and customers may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain the business or financial arrangements and relationships through which we research, as well as, market, sell and distribute any products for which we obtain marketing approval. Restrictions under applicable federal and state healthcare laws and regulations that may be applicable to our business include the following:

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the federal Anti-Kickback Statute prohibits, among other things, persons from knowingly and willfully soliciting, offering, receiving or providing remuneration, 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, order or recommendation of, any good or service, for which payment may be made under a federal healthcare program such as Medicare and Medicaid;

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the federal civil and criminal false claims laws, including the False Claims Act, which can be enforced by civil whistleblower or qui tam actions on behalf of the government, and criminal false claims laws and the civil monetary penalties law, prohibit individuals or entities from, among other things, knowingly presenting, or causing to be presented false or fraudulent claims for payment by a federal government 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;

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HIPAA prohibits, among other things, knowingly and willfully executing, or attempting to execute, a scheme to defraud any healthcare benefit program, regardless of the payor (e.g. public or private), and knowingly and willfully falsifying, concealing or covering up by any trick or device a material fact or making any materially false, fictitious or fraudulent statements in connection with the delivery of, or payment for, healthcare benefits, items or services relating to healthcare matters;

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HIPAA, as amended by HITECH, and their implementing regulations, impose requirements on certain covered healthcare providers, health plans, and healthcare clearinghouses as well as their respective business associates and their subcontractors that perform services for them that involve the use, or disclosure of, protected health information, relating to the privacy, security, and transmission of such protected health information;

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the federal Physician Payments Sunshine Act’s transparency requirements under the ACA requires certain manufacturers of drugs, devices, biologics and medical supplies to annually report to CMS information related to payments and other transfers of value provided to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors), physician assistants, certain types of advance practice nurses and

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teaching hospitals, as well as ownership and investment interests held by physicians, and their immediate family members. The reported information is made available on a public website; and

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analogous state laws and regulations such as state anti-kickback and false claims laws and analogous non-U.S. fraud and abuse laws and regulations, may apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private insurers. Some state laws require biologics companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance regulations promulgated by the federal government and may require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers, marketing expenditures, or drug pricing, including price increases. State and local laws require the registration of pharmaceutical sales representatives. State and non-U.S. laws that 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 preempted by HIPAA, thus complicating compliance efforts.

Efforts to ensure that our business arrangements with third parties 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, disgorgement, imprisonment, exclusion from government funded healthcare programs, such as Medicare and Medicaid and other federal healthcare programs, contractual damages, reputational harm, diminished profits and future earnings, additional integrity reporting and oversight obligations, and the curtailment or restructuring of our operations, any of which could adversely affect our ability to operate our business and our results of operations. 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 significant criminal, civil and administrative sanctions, including exclusions from government funded healthcare programs, which could have a material adverse effect on our business, results of operations, financial condition and prospects.

We may face difficulties from healthcare legislative and regulatory reform measures.

Existing regulatory policies may change, and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our product candidates, or affect pricing and third-party payment for our product candidates, which could negatively affect our business, financial condition and prospects. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action, either in the United States or abroad. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have obtained and we may not achieve or sustain profitability.

In the United States, there have been and continue to be a number of legislative initiatives to contain healthcare costs. For example, in March 2010, the ACA was enacted to broaden access to health insurance, reduce or constrain the growth of healthcare spending, enhance remedies against fraud and abuse, add new transparency requirements for health care and health insurance industries, impose new taxes and fees on the health industry and impose additional health policy reforms. The law appears likely to continue the downward pressure on pharmaceutical pricing, especially under the Medicare program, and may also increase our regulatory burdens and operating costs..

There have been executive, legislative and judicial efforts to modify, repeal or otherwise invalidate all or certain aspects of the ACA. It is possible that the ACA will be subject to judicial or Congressional challenges in the future. It is uncertain how any such challenges and healthcare measures of the Biden administration will impact the ACA and our business.

In addition, other legislative changes have been proposed and adopted in the United States since the ACA was enacted to reduce healthcare expenditures. U.S. federal government agencies also currently face potentially significant spending reductions, which may further impact healthcare expenditures, including reductions of Medicare payments to providers of 2% per fiscal year, which went into effect in April, 2013 and, due to subsequent legislative amendments to the statute, will remain in effect through 2031 unless additional Congressional action is taken. The Medicare reductions phase back in starting with a 1% reduction in effect from April 1, 2022 to June 30, 2022 before increasing to the full 2% reduction. Moreover, on January 2, 2013, the American Taxpayer Relief Act of 2012 was signed into law, which, among other

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things, further reduced Medicare payments to several types of providers, including hospitals, imaging centers and cancer treatment centers, and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. If federal spending is further reduced, anticipated budgetary shortfalls may also impact the ability of relevant agencies, such as the FDA or the National Institutes of Health to continue to function at current levels. Amounts allocated to federal grants and contracts may be reduced or eliminated. These reductions may also impact the ability of relevant agencies to timely review and approve research and development, manufacturing, and marketing activities, which may delay our ability to develop, market and sell any products we may develop.

Moreover, payment methodologies, including payment for companion or complementary diagnostics, may be subject to changes in healthcare legislation and regulatory initiatives. In addition, CMS has begun bundling the Medicare payments for certain laboratory tests ordered while a patient received services in a hospital outpatient setting and, beginning in 2018, CMS will pay for clinical laboratory services based on a weighted average of reported prices that private payors, Medicare Advantage plans, and Medicaid Managed Care plans pay for laboratory services. Further, on March 16, 2018, CMS finalized its National Coverage Determination (the “NCD”), for certain diagnostic laboratory tests using next generation sequencing that are approved by the FDA as a companion in vitro diagnostic and used in a cancer with an FDA-approved companion diagnostic indication. Under the NCD, diagnostic tests that gain FDA approval or clearance as an in vitro companion diagnostic will automatically receive full coverage and be available for patients with recurrent, metastatic relapsed, refractory or stages III and IV cancer. Additionally, the NCD extended coverage to repeat testing when the patient has a new primary diagnosis of cancer.

Recently there has been heightened governmental scrutiny over the manner in which manufacturers set prices for their marketed products, which has resulted in several Presidential executive orders, Congressional inquiries and proposed and enacted federal and state legislation designed to, among other things, bring more transparency to product pricing, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for drug products.

For example, the Budget Control Act of 2011 imposed, subject to certain temporary suspension periods, 2% reductions in Medicare payments to providers per fiscal year starting in April 2013 and, due to subsequent legislative amendments to the statute, will remain in effect through 2031, unless additional Congressional action is taken. Further, in November 2020, the U.S. Department of Health and Human Services (“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 rule also creates a new safe harbor for price reductions reflected at the point-of-sale, as well as a safe harbor for certain fixed fee arrangements between pharmacy benefit managers and manufacturers. The implementation of this final rule was delayed by the Biden administration until January 2023 and subsequently delayed by the IRA until January 2032. In December 2020, CMS issued a final rule implementing significant manufacturer price reporting changes under the Medicaid Drug Rebate Program, including regulations that affect manufacturer-sponsored patient assistance programs subject to pharmacy benefit manager accumulator programs and Best Price reporting related to certain value-based purchasing arrangements. Under the American Rescue Plan Act of 2021, effective January 2024, the statutory cap on Medicaid Drug Rebate Program rebates that manufacturers pay to state Medicaid programs will be eliminated. Elimination of this cap may, in some cases, require pharmaceutical manufacturers to pay more in rebates than they receive on the sale of products. It is unclear to what extent these new regulations requirements will be implemented and to what extent these regulations or any future legislation or regulations by the Biden administration will have on our business, including our ability to generate revenue and achieve profitability.

Additionally, several healthcare reform initiatives culminated in the enactment of the IRA in August 2022, which, among other things, allows HHS to directly negotiate the selling price of a statutorily specified number of drugs and biologics each year that CMS reimburses under Medicare Part B and Part D. Only high-expenditure single-source drugs that have been approved for at least seven years (11 years for single-source biologics) are eligible to be selected by CMS for negotiation, with the negotiated price taking effect two years after the selection year. Negotiations for Medicare Part D products begin in 2024 with the negotiated price taking effect in 2026, and negotiations for Medicare Part B products begin in 2026 with the negotiated price taking effect in 2028. In August 2023, HHS announced the 10 Medicare Part D drugs and biologics that it selected for negotiations. HHS will announce the negotiated maximum fair prices by September 2024. This price cap, which cannot exceed a statutory ceiling price, will become effective in January 2026 and will represent a significant discount from average prices to wholesalers and direct purchasers. The IRA also imposes rebates on Medicare Part B and Part D drugs whose prices have increased at a rate greater than the rate of inflation. The IRA also extends enhanced subsidies for individuals purchasing health insurance coverage in ACA marketplaces through

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plan year 2025. The IRA permits the Secretary of HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years. Manufacturers that fail to comply with the IRA may be subject to various penalties, including civil monetary penalties. These provisions may be subject to legal challenges. For example, the provisions related to the negotiation of selling prices of high-expenditure single-source drugs and biologics have been challenged in multiple lawsuits brought by pharmaceutical manufacturers. The outcome of these lawsuits is uncertain, and some IRA drug discount provisions have not been challenged in litigation. Thus, while the full economic impact of the IRA is unknown at this time, it will likely have a significant impact on the pharmaceutical industry and the pricing of our products and product candidates. Similarly, the adoption of restrictive price controls in new jurisdictions, more restrictive controls in existing jurisdictions or the failure to obtain or maintain timely or adequate pricing could also adversely impact revenue. We expect pricing pressures will continue globally.

At the state level, legislatures are increasingly enacting 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, the FDA released a final rule in September 2020 providing guidance for states to build and submit importation plans for drugs from Canada, and the FDA authorized the first such plan in Florida in January 2024. 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 companion or complementary diagnostics or additional pricing pressures.

We expect that additional state and federal healthcare reform measures will be adopted in the future. Such reform measures may result in more rigorous coverage criteria and in additional downward pressure on the price that we receive for any approved product. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability, or commercialize our products.

Governments outside of the United States tend to impose strict price controls, which may adversely affect our revenues, if any.

In some countries, particularly the countries of the European Union (the “EU”), the pricing of prescription biological products is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product. To obtain reimbursement or pricing approval in some countries, we may be required to conduct a clinical trial that compares the cost-effectiveness of any of our product candidates to other available therapies. If reimbursement of our products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, our business could be harmed. Political, economic and regulatory developments may further complicate pricing negotiations, and pricing negotiations may continue after reimbursement has been obtained. Reference pricing used by various EU member states, and parallel trade, such as arbitrage between low-priced and high-priced member states, can further reduce prices. There can be no assurance that any country that has price controls or reimbursement limitations for biological products will allow favorable reimbursement and pricing arrangements for any products, if approved in those countries. In addition, the recent withdrawal of the United Kingdom (the “UK”) from its membership in the EU, often referred to as “Brexit”, has caused uncertainty in the current regulatory framework in Europe and could lead to the UK and EU adopting divergent laws and regulations, including those related to the pricing of prescription biological products, as the UK determines which EU laws to replicate or replace. If the UK were to significantly alter its regulations affecting the pricing of prescription biological products, we could face significant new costs. As a result, Brexit could impair our ability to transact business in the EU and the UK.

Laws and regulations governing any international operations we may have in the future may preclude us from developing, manufacturing and selling certain product candidates and products outside of the United States and require us to develop and implement costly compliance programs.

If we expand our operations outside of the United States, we must dedicate additional resources to comply with numerous laws and regulations in each jurisdiction in which we plan to operate. The Foreign Corrupt Practices Act (the “FCPA”), prohibits any U.S. individual or business from paying, offering, authorizing payment or offering anything of value, directly or indirectly, to any foreign official, political party or candidate for the purpose of influencing any act or decision of such third party in order to assist the individual or business in obtaining or retaining business. The FCPA also obligates companies whose securities are listed in the United States to comply with certain accounting provisions requiring the company to maintain books and records that accurately and fairly reflect all transactions of the company,

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including international subsidiaries, and to devise and maintain an adequate system of internal accounting controls for international operations.

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 biological products 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.

Various laws, regulations and executive orders also restrict the use and dissemination outside of the United States, or the sharing with certain non-U.S. nationals, of information classified for national security purposes, as well as certain products and technical data relating to those products. If we expand our presence outside of the United States, it will require us to dedicate additional resources to comply with these laws, and these laws may preclude us from developing, manufacturing or selling certain product candidates and products outside of the United States, which could limit our growth potential and increase our development costs.

The failure to comply with laws governing international business practices may result in substantial civil and criminal penalties and suspension or debarment from government contracting. The SEC also may suspend or bar issuers from trading securities on U.S. exchanges for violations of the FCPA’s accounting provisions.

If we fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could harm our business.

We and our third-party contractors are subject to numerous foreign, federal, state and local environmental, health and safety laws and regulations, including those governing laboratory procedures and the handling, use, storage, treatment and disposal of hazardous materials and wastes. Our operations involve the use of hazardous and flammable materials, including chemicals and biological materials. Our operations also produce hazardous waste products. We generally contract with third parties for the disposal of these materials and wastes. We cannot eliminate the risk of contamination or injury from these materials. In the event of contamination or injury resulting from our use of hazardous materials, we could be held liable for any resulting damages, and any liability could exceed our resources, including any available insurance.

In addition, our leasing and operation of real property may subject us to liability pursuant to certain of these laws or regulations. Under existing U.S. environmental laws and regulations, current or previous owners or operators of real property and entities that disposed or arranged for the disposal of hazardous substances may be held strictly, jointly and severally liable for the cost of investigating or remediating contamination caused by hazardous substance releases, even if they did not know of and were not responsible for the releases.

We could incur significant costs and liabilities which may adversely affect our financial condition and operating results for failure to comply with such laws and regulations, including, among other things, civil or criminal fines and penalties, property damage and personal injury claims, costs associated with upgrades to our facilities or changes to our operating procedures, or injunctions limiting or altering our operations.

Although we maintain liability insurance to cover us for costs and expenses we may incur due to injuries to our employees, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for environmental liability or toxic tort claims that may be asserted against us in connection with our storage or disposal of biological, hazardous or radioactive materials.

In addition, we may incur substantial costs in order to comply with current or future environmental, health and safety laws and regulations. These current or future laws and regulations, which are becoming increasingly more stringent, may impair our research, development or production efforts. Our failure to comply with these laws and regulations also may result in substantial fines, penalties or other sanctions.

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We are subject to certain U.S. and certain other anti-corruption, anti-money laundering, export control, sanctions and other trade laws and regulations. We can face serious consequences for violations.

U.S. and other anti-corruption, anti-money laundering, export control, sanctions and other trade laws and regulations prohibit, among other things, companies and their employees, agents, CROs, CMOs, legal counsel, accountants, consultants, contractors and other partners from authorizing, promising, offering, providing, soliciting, or receiving directly or indirectly, corrupt or improper payments or anything else of value to or from recipients in the public or private sector. Violations of these laws can result in substantial criminal fines and civil penalties, imprisonment, the loss of trade privileges, debarment, tax reassessments, breach of contract and fraud litigation, reputational harm and other consequences. We have direct or indirect interactions with officials and employees of government agencies or government-affiliated hospitals, universities and other organizations. We also expect our non-U.S. activities to increase over time. We expect to rely on third parties for research, preclinical studies and clinical trials and/or to obtain necessary permits, licenses, patent registrations and other marketing approvals. We can be held liable for the corrupt or other illegal activities of our personnel, agents, or partners, even if we do not explicitly authorize or have prior knowledge of such activities.

Any violations of the laws and regulations described above may result in substantial civil and criminal fines and penalties, imprisonment, the loss of export or import privileges, debarment, tax reassessments, breach of contract and fraud litigation, reputational harm and other consequences.

Risks related to our reliance on third parties

We rely, and intend to continue to rely, on third parties to conduct our clinical trials and perform all of our research and preclinical studies. If these third parties do not satisfactorily carry out their contractual duties, fail to comply with applicable regulatory requirements or do not meet expected deadlines, our development programs may be delayed or subject to increased costs or we may be unable to obtain regulatory approval, each of which may have an adverse effect on our business, financial condition, results of operations and prospects.

We do not have the ability to independently conduct all aspects of our preclinical testing or clinical trials ourselves. As a result, we expect to be dependent on third parties to conduct our planned preclinical studies and clinical trials of EO-3021 and other product candidates. The timing of the initiation and completion of these trials will therefore be partially controlled by such third parties and may result in delays to our development programs. Specifically, we expect CROs, clinical investigators and consultants to play a significant role in the conduct of these trials and the subsequent collection and analysis of data. However, these CROs and other third parties are not our employees, and we will not be able to control all aspects of their activities. Nevertheless, we are responsible for ensuring that each clinical trial is conducted in accordance with the applicable protocol and legal, regulatory and scientific standards, and our reliance on the CROs and other third parties does not relieve us of our regulatory responsibilities. We and our CROs are required to comply with GCP requirements, which are regulations and guidelines enforced by the FDA for product candidates in clinical development. Regulatory authorities enforce these GCP requirements through periodic inspections of trial sponsors, clinical trial investigators and clinical trial sites. If we or any of our CROs or clinical trial sites fail to comply with applicable GCP requirements, the data generated in our clinical trials may be deemed unreliable, and the FDA may require us to perform additional clinical trials before approving our marketing applications. We cannot assure you that, upon inspection, the FDA will determine that our clinical trials comply with GCPs. In addition, our clinical trials must be conducted with product produced under cGMP regulations. Our failure, or the failure of third parties on whom we rely, to comply with these regulations may require us to stop and/or repeat clinical trials, which would delay the marketing approval process.

There is no guarantee that any such CROs, clinical trial investigators or other third parties on which we rely will devote adequate time and resources to our development activities or perform as contractually required. If any of these third parties fail to meet expected deadlines, adhere to our clinical protocols or meet regulatory requirements, otherwise perform in a substandard manner, or terminate their engagements with us, the timelines for our development programs may be extended or delayed or our development activities may be suspended or terminated. If our clinical trial site terminates for any reason, we may experience the loss of follow-up information on subjects enrolled in such clinical trial unless we are able to transfer those subjects to another qualified clinical trial site, which may be difficult or impossible.

Furthermore, these third parties may also have relationships with other entities, some of which may be our competitors, for whom they may also be conducting clinical trials or other biological product development activities that could harm

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our competitive position. 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 will not be able to obtain, or may be delayed in obtaining, marketing approvals for EO-3021 or any other product candidates and will not be able to, or may be delayed in our efforts to, successfully commercialize our products.

Manufacturing biological products is complex and subject to product loss for a variety of reasons. We rely on third parties to manufacture clinical supplies of our product candidates and we intend to rely on third parties to produce commercial supplies of any approved product. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or products or such quantities at an acceptable cost or quality, which could delay, prevent or impair our development or commercialization efforts.

We do not have any manufacturing facilities. We rely, and expect to continue to rely, on third parties for the manufacture of our product candidates and future product candidates for clinical testing, product development purposes, to support regulatory application submissions, as well as for commercial manufacture if a product candidate obtains marketing approval. In addition, we expect to contract with analytical laboratories for release and stability testing of our product candidates. Subject to certain exceptions, we are required to acquire our clinical and commercial supply of EO-3021 primarily from CSPC in China. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or products or such quantities at an acceptable cost or quality, which could delay, prevent or impair our development or commercialization efforts.

With rising international trade tensions or sanctions, our business may be adversely affected following new or increased tariffs that result in increased costs as a result of international transportation of supplies, as well as the costs of materials and products imported into the United States, particularly if these measures occur in regions where we source our product candidates, components or raw materials, such as China. Tariffs, trade restrictions, sanctions, export controls or other restrictive actions imposed by the United States or other countries, including as a result of geopolitical tension, such as a deterioration in the relationship between the United States and China or escalation of ongoing regional military conflicts, could increase the prices of our and our partners’ products and product candidates, affect our and our partners’ ability to commercialize such products and product candidates, or create adverse tax consequences in the United States or other countries. Countries may also adopt other measures, such as controls on imports or exports of goods, technology or data, that could adversely impact our operations and supply chain. As a result, changes in international trade policy, changes in trade agreements and the imposition of tariffs, trade restrictions, sanctions, export controls or other restrictive actions by the United States or other countries could materially adversely affect our results of operations and financial condition.

We may be unable to establish any agreements with third-party manufacturers or do so on favorable terms. Even if we are able to establish agreements with third-party manufacturers, reliance on third-party manufacturers entails additional risks, including:

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reliance on the third party for regulatory, compliance and quality assurance;

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reliance on the third party for product development, analytical testing, and data generation to support regulatory applications;

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lack of qualified backup suppliers for those components or materials that are currently purchased from a sole or single source supplier;

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operations of our third-party manufacturers or suppliers could be disrupted by conditions unrelated to our business or operations, including the bankruptcy of the manufacturer or supplier, the issuance of an FDA Form 483 notice or warning letter or other enforcement action by FDA or other regulatory authority;

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

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

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

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carrier disruptions or increased costs that are beyond our control; and

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failure to deliver our drugs under specified storage conditions and in a timely manner.

We acquire many key materials for the manufacture of our product candidates on a purchase order basis, and we may not have long-term committed arrangements with respect to any product candidate. We will need to establish one or more agreements with third parties in order to develop and scale up our drug manufacturing process, conduct drug testing and generate data to support one or more regulatory submissions. If we obtain marketing approval for a product candidate, we will need to establish an agreement for commercial manufacture with a third party.

We use a limited number of suppliers for key components of our manufacturing process. Even if we are able to replace any raw materials or other materials with an alternative, such alternatives may cost more, result in lower yields or not be as suitable for our purposes. In addition, some of the materials that we use to manufacture our product candidates are complex materials, which may be more difficult to substitute. Therefore, any disruptions arising from our current supplier could result in delays and additional regulatory submissions.

Third-party manufacturers may not be able to comply with cGMP regulations or similar regulatory requirements outside of the United States. If the FDA determines that our third-party manufacturers are not in compliance with FDA laws and regulations, including those governing cGMPs, the FDA may not approve a BLA until the deficiencies are corrected or we replace the manufacturer in our application with a manufacturer that is in compliance. Moreover, our failure, or the failure of our third-party manufacturers and suppliers, to comply with applicable regulations could result in sanctions being imposed on us, including clinical holds, fines, injunctions, civil penalties, seizures or recalls of product candidates or products, operating restrictions and criminal prosecutions, any of which could significantly and adversely affect supplies of our products. In addition, approved products and the facilities at which they are manufactured are required to maintain ongoing compliance with extensive FDA requirements and the requirements of other similar agencies, including ensuring that quality control and manufacturing procedures conform to cGMP requirements. As such, our third-party manufacturers are subject to continual review and periodic inspections to assess compliance with cGMPs. Furthermore, although we do not have day-to-day control over the operations of our third-party manufacturers, we are responsible for ensuring compliance with applicable laws and regulations, including cGMPs.

Further, if we make manufacturing or formulation changes to our product candidates or add or change CMOs in the future, the FDA or other regulatory authorities will require a demonstration of the comparability of the new product to the prior product, including potentially through a clinical bridging study.

In addition, our third-party manufacturers and suppliers are subject to numerous environmental, health and safety laws and regulations, including those governing the handling, use, storage, treatment and disposal of waste products, and failure to comply with such laws and regulations could result in significant costs associated with civil or criminal fines and penalties for such third parties. Based on the severity of regulatory actions that may be brought against these third parties in the future, our clinical or commercial supply of drug and packaging and other services could be interrupted or limited, which could harm our business.

Our product candidates and any products that we may develop may compete with other future product candidates and products for access to manufacturing facilities. As a result, we may not obtain access to these facilities on a priority basis or at all. There are a limited number of manufacturers that operate under cGMP regulations and that might be capable of manufacturing for us.

Any performance failure on the part of our existing or future CMOs could delay clinical development or marketing approval. We do not currently have arrangements in place for redundant supply or a second source for bulk drug substances. If our current CMOs for preclinical and clinical testing cannot perform as agreed, we may be required to replace such CMOs, and we may incur added costs and delays in identifying and qualifying any such replacement manufacturer or we may not be able to reach agreement with any alternative manufacturer. Further, our third-party manufacturers may experience manufacturing or shipping difficulties due to resource constraints or as a result of natural disasters, labor disputes, unstable political environments or public health epidemics. If our current third-party manufacturers cannot perform as agreed, we may be required to replace such manufacturers and we may be unable to replace them on a timely basis or at all.

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

We may enter into collaborations with third parties for the development and commercialization of our product candidates. If those collaborations are not successful, we may not be able to capitalize on the market potential of our product candidates.

We may seek third-party collaborators for the development and commercialization of our product candidates on a select basis. For example, we intend to pursue further development of seribantumab only in collaboration with a partner. We have not entered into any such collaborations to date, and we may not be successful in finding a partner for further development of seribantumab. Our likely collaborators for any future collaboration arrangements include large and mid-size biologics companies, regional and national biologics companies and biotechnology companies. We will face significant competition in seeking appropriate collaborators. Our ability to reach a definitive agreement for a future collaboration will depend, among other things, upon our assessment of the future collaborator’s resources and expertise, the terms and conditions of the proposed collaboration and the proposed collaborator’s evaluation of a number of factors.

If we do enter into any such arrangements with any third parties, we will likely have limited control over the amount and timing of resources that our future collaborators dedicate to the development or commercialization of our product candidates. Our ability to generate revenues from these arrangements will depend on our future collaborators’ abilities and efforts to successfully perform the functions assigned to them in these arrangements. Collaborations with future collaborators involving our product candidates would pose numerous risks to us, including the following:

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collaborators have significant discretion in determining the efforts and resources that they will apply to these collaborations and may not perform their obligations as expected;

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collaborators may de-emphasize or 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, including as a result of a sale or disposition of a business unit or development function, or available funding or external factors such as an acquisition that diverts resources or creates competing priorities;

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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;

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collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our products or product candidates if the collaborators believe that competitive products are more likely to be successfully developed or can be commercialized under terms that are more economically attractive than ours;

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a collaborator with marketing and distribution rights to multiple products may not commit sufficient resources to the marketing and distribution of our product relative to other products;

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

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disputes may arise between the collaborators and us that result in the delay or termination of the research, development or commercialization of our products or product candidates or that result in costly litigation or arbitration that diverts management attention and resources;

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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;

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collaboration agreements may not lead to development or commercialization of product candidates in the most efficient manner or at all; and

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if a future collaborator of ours were to be involved in a business combination, the continued pursuit and emphasis on our product development or commercialization program could be delayed, diminished or terminated.

If we establish one or more collaborations, all of the risks relating to product development, regulatory approval and commercialization described herein would also apply to the activities of any such future collaborators.

Risks related to commercialization of our product candidates

The total addressable market opportunity for EO-3021 and other product candidates we may develop will ultimately depend upon, among other things, the diagnosis criteria included in the final labeling for each such product candidate if it is approved for sale for these indications, acceptance by the medical community, patient access, drug and any related companion or complementary diagnostic pricing and their reimbursement. The total addressable market opportunity for product candidates we may develop may depend upon commercially available next generation sequencing testing.

We may initially seek regulatory approval of our product candidates as therapies for relapsed or refractory patients. The number of patients in our targeted commercial markets and elsewhere may turn out to be lower than expected, patients may not be otherwise amenable to treatment with our drugs or new patients may become increasingly difficult to identify or gain access to, all of which would adversely affect our results of operations and our business.

Even if our product candidates receive marketing approval, they may fail to achieve the degree of market acceptance by physicians, patients, third-party payors and others in the medical community necessary for commercial success.

If our product candidates receive marketing approval, they may nonetheless fail to gain sufficient market acceptance by physicians, patients, third-party payors and others in the medical community. For example, current cancer treatments, such as existing targeted therapies, chemotherapy, and radiation therapy, are well established in the medical community, and doctors may continue to rely on these treatments. If our product candidates do not achieve an adequate level of acceptance, we may not generate significant product revenues and we may not become profitable. The degree of market acceptance of our product candidates, if approved for commercial sale, will depend on a number of factors, including:

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the efficacy and potential advantages compared to alternative treatments;

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the acceptance of our product candidates as front-line treatments for various indications;

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the prevalence and severity of any side effects, in particular compared to alternative treatments;

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limitations or warnings contained in the labeling approved by the FDA or other regulatory authorities;

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the size of the target patient population;

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the willingness of the target patient population to try new therapies and of physicians to prescribe these therapies;

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our ability to offer our products for sale at competitive prices;

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the convenience and ease of administration compared to alternative treatments;

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the strength of marketing and distribution support;

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publicity for our product candidates and competing products and treatments;

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the existence of distribution and/or use restrictions, such as through a REMS;

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the availability of third-party payor coverage and adequate reimbursement;

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the timing of any marketing approval in relation to other product approvals;

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support from patient advocacy groups; and

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any restrictions on the use of our products together with other medications.

We currently have no marketing and sales organization and have no experience as a company in commercializing products and we may have to invest significant resources to develop these capabilities. If we are unable to establish sales and marketing capabilities or enter into agreements with third parties to market and sell our products, we may not be able to generate revenue.

We have never commercialized a product candidate and we currently have no sales or marketing infrastructure and have no experience in the sale, marketing or distribution of biological products. Our operations to date have been limited to organizing and staffing our company, business planning, raising capital, acquiring the rights to our product candidate and undertaking preclinical studies and clinical trials of our product candidate. To achieve commercial success for any product for which we obtain marketing approval, we will need to establish sales, marketing and distribution capabilities, either ourselves or through collaboration or other arrangements with third parties.

There are risks involved with establishing our own sales and marketing capabilities. For example, recruiting and training a sales force is expensive and 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 capabilities is delayed or does not occur for any reason, we would have prematurely or unnecessarily incurred these commercialization expenses. These efforts are expected to be costly, and our investment would be lost if we cannot retain or reposition our sales and marketing personnel.

Factors that may inhibit our efforts to commercialize our products on our own include:

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

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our inability to raise financing necessary to build our commercialization infrastructure;

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the inability of sales personnel to obtain access to physicians or educate an adequate number of physicians as to the benefits of our products;

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unfavorable third-party payor coverage and reimbursement in any geography;

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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; and

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unforeseen costs and expenses associated with creating an independent sales and marketing organization.

Furthermore, developing a sales and marketing organization requires significant investment, is time-consuming and could delay the launch of our product candidate. We may not be able to build an effective sales and marketing organization in the United States, the EU or other key global markets. If we are unable to build our own distribution and marketing capabilities or to find suitable partners for the commercialization of our product candidate, we may have difficulties generating revenue from them.

If we enter into arrangements with third parties to perform sales and marketing services, our product revenues and our profitability, if any, are likely to be lower than if we were to market and sell any products that we develop ourselves. In addition, we may not be successful in entering into arrangements with third parties to market and sell our product

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candidates or may be unable to do so on terms that are acceptable to us. We likely will have little control over such third parties, and any of these third parties may 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 any product candidate for which we receive marketing approval.

We face substantial competition, which may result in others discovering, developing or commercializing products before or more successfully than we do.

The development and commercialization of biological products is highly competitive. We face competition with respect to our current product candidates and will face competition with respect to any product candidates that we may seek to develop or commercialize in the future, from major biologics companies, specialty biologics companies and existing or emerging biotechnology companies, academic research institutions and governmental agencies and public and private research institutions worldwide.

There are a number of biological and biotechnology companies that currently are pursuing the development of selective cancer therapies for patients with significant unmet medical needs. In particular, we expect that EO-3021 will compete against other ADCs targeting Claudin 18.2. Several such candidates are currently in clinical development, including those of Antengene (ATG-022), AstraZeneca (AZD0901/CMG901), Innovent Biologics (IBI343), LaNova Medicines (LM-302), Merck (MK1200/SKB315), Merck KGaA/Jiangsu Hengrui Pharmaceuticals (SHR-A1904), RemeGen (RC118), Shanghai Junshi Bioscience (JS107) and TORL Biotherapeutics (CLDN18.2-307-ADC). We may face further competition from companies pursuing the development of product candidates that target Claudin 18.2 through other modalities, including Astellas Pharma, Beijing Mabworks Biotech, CARsgen Therapeutics, Flame Biosciences, Jiangsu Aosaikang Pharmaceutical, Legend Biotech, NovaRock Biotherapeutics, Shanghai Longyao Biotechnology, Transcenta Holding, Triumvira Immunologics, Zai Lab and others. Development efforts with respect to, and clinical trial results of, these potentially competitive product candidates may be unsuccessful, which could result in a negative perception of product candidates targeting Claudin 18.2 in general, which could in turn negatively impact the regulatory approval process for EO-3021.

Many of the companies against which we are competing or against which we may compete in the future, either alone or through collaborations, 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.

Furthermore, we also face competition more broadly across the oncology market for cost-effective and reimbursable cancer treatments. There are a variety of available drug therapies marketed for cancer. In many cases, these drugs are administered in combination to enhance efficacy. While our product candidates, if approved, may compete with these existing drugs and other therapies, to the extent they are ultimately used in combination with or as an adjunct to these therapies, our product candidates may not be competitive with them. Some of these drugs are branded and subject to patent protection, and others are available on a generic basis. Insurers and other third-party payors may also encourage the use of generic products or specific branded products. As a result, obtaining market acceptance of, and gaining significant share of the market for, our product candidates may pose challenges. In addition, many companies are

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developing new oncology therapeutics, and we cannot predict what the standard of care will be as product candidates progress through clinical development.

Our commercial opportunity could be reduced or eliminated if our competitors develop and commercialize products that are safer, more effective, have fewer or less severe side effects, are more convenient to administer, are less expensive or with a more favorable labeling than our product candidates. Our competitors also may obtain FDA, foreign regulatory authority, or other marketing or regulatory approval for their products more rapidly than any approval we may obtain for ours, which could result in our competitors establishing a strong market position before we are able to enter the market, thereby limiting our potential for commercial success.

Even if we are able to commercialize any product candidates, the products may become subject to unfavorable pricing regulations, third-party reimbursement practices or healthcare reform initiatives, which would harm our business.

The regulations that govern marketing approvals, pricing, coverage and reimbursement for new drug products vary widely from country to country. Current and future legislation may significantly change the approval requirements in ways that could involve additional costs and cause delays in obtaining approvals. 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. To obtain reimbursement or pricing approval in some countries, we may be required to conduct a clinical trial that compares the cost-effectiveness of our product candidate to other available therapies. 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 candidate in a particular country, but then be subject to price regulations that delay our commercial launch of the product, possibly for lengthy time periods, and negatively impact the revenues, if any, 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 such product candidates obtain marketing approval.

Our ability to commercialize any product candidates successfully also will depend in part on the extent to which coverage and adequate reimbursement for these products and related treatments will be available from third-party payors, including government healthcare programs, private health insurers and other organizations. Third-party payors decide which medications they will pay for and establish reimbursement levels. In the United States, the principal decisions about reimbursement for new medicines are typically made by the CMS, which decides whether and to what extent a new medicine will be covered and reimbursed under Medicare. Private payors often, but not always, follow CMS’s decisions regarding coverage and reimbursement.

A primary trend in the U.S. healthcare industry and elsewhere is cost containment. Third-party payors have attempted to control costs by limiting coverage and the amount of reimbursement for particular medications. Increasingly, third-party payors are requiring that drug companies provide them with predetermined discounts from list prices and are challenging the prices charged for medical products. Coverage and reimbursement may not be available for any product that we commercialize and, even if these are available, the level of reimbursement may not be satisfactory. Reimbursement may affect the demand for, or the price of, any product candidate for which we obtain marketing approval. Obtaining and maintaining coverage and adequate reimbursement for our products may be difficult. We may be required to conduct expensive pharmacoeconomic studies to justify coverage and reimbursement or the level of reimbursement relative to other therapies. If coverage and adequate reimbursement are not available or reimbursement is available only to limited levels, we may not be able to successfully commercialize any product candidate for which we obtain marketing approval.

Additionally, we may develop, either by ourselves or with collaborators, companion or complementary diagnostic tests for our product candidates for certain indications. We, or our collaborators, if any, will be required to obtain coverage and reimbursement for these tests separate and apart from the coverage and reimbursement we seek for our product candidates, if approved. While we have not yet developed any companion or complementary diagnostic test for our product candidates, if we do, there is significant uncertainty regarding our ability to obtain coverage and adequate reimbursement for the same reasons that are applicable to our product candidates.

There may also be significant delays in obtaining coverage and reimbursement for newly approved drugs, and coverage may be more limited than the purposes for which the drug 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 will be paid for in all cases or at a rate that covers our costs, including research, development, intellectual property,

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manufacture, sale and distribution expenses. Interim reimbursement levels for new drugs, if applicable, may also not be sufficient to cover our costs and may not be made permanent. Reimbursement rates may vary according to the use of the drug and the clinical setting in which it is used, may be based on reimbursement levels already set for lower cost drugs and may be incorporated into existing payments for other services. Net prices for drugs may be reduced by mandatory discounts or rebates required by government healthcare programs or private payors and by any future relaxation of laws that presently restrict imports of drugs from countries where they may be sold at lower prices than 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 determinations. Our inability to promptly obtain coverage and adequate reimbursement rates from third-party payors for any approved products 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 also cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action, either in the United States, or abroad. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, our product candidates may lose any marketing approval that may have been obtained and we may not achieve or sustain profitability, which would adversely affect our business.

Product liability lawsuits against us could cause us to incur substantial liabilities and to limit commercialization of any products that we may develop.

We face an inherent risk of product liability exposure related to the testing of our product candidates in human clinical trials and will face an even greater risk if we commercialize any products that we may develop. If we cannot successfully defend ourselves against any claims that our product candidates or products caused injuries, we will incur substantial liabilities. Regardless of merit or eventual outcome, liability claims may result in:

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decreased demand for any product candidates or products that we may develop;

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injury to our reputation and significant negative media attention;

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initiation of investigations by regulators;

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withdrawal of clinical trial participants;

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significant time and costs to defend the related litigation;

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diversion of management and scientific resources from our business operations;

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substantial monetary awards to trial participants or patients;

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loss of revenue;

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reduced resources of our management to pursue our business strategy; and

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the inability to commercialize any products that we may develop.

Our current product liability insurance coverage for the United States and certain other jurisdictions may not be adequate to cover all liabilities that we may incur. We likely will need to increase our insurance coverage as we expand our clinical trials or if we commence commercialization of our product candidates. Insurance coverage is increasingly expensive. We may not be able to maintain insurance coverage at a reasonable cost or in an amount adequate to satisfy any liability that may arise. A successful product liability claim or series of claims brought against us could decrease our cash and adversely affect our business and financial condition.

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Risks related to employee matters and our operations

We may experience significant growth in the number of our employees and the scope of our operations, particularly in the areas of clinical development, clinical operations, manufacturing, late-stage regulatory affairs, finance, accounting, business operations, public company compliance, communications and other corporate development functions, and, if any of our product candidates receives marketing approval, sales, marketing and distribution. If we acquire additional product candidates or enter into future collaborations, we may need to expand our employee base beyond our current projections, which may include further preclinical research and development or later-stage regulatory operations. To manage our potential growth, 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 our limited financial resources and the limited experience of our management team in managing a company with such anticipated growth and with developing sales, marketing and distribution infrastructure, we may not be able to effectively manage the expansion of our operations or recruit and train additional qualified personnel. The expansion of our operations may lead to significant costs and may divert our management and business development resources. Further, rapid expansion of our workforce while remaining a virtual company may have a detrimental impact on employee morale and cohesion.

Further, we currently rely, and for the foreseeable future will continue to rely, in substantial part on certain third-party contract organizations, advisors and consultants to provide certain services, including assuming substantial responsibilities for the conduct of our clinical trials and the manufacturing of our product candidates. We cannot assure you that the services of such third-party contract organizations, advisors and consultants will continue to be available to us on a timely basis when needed, or that we can find qualified replacements. In addition, if we are unable to effectively manage our outsourced activities or if the quality or accuracy of the services provided by our vendors or consultants is compromised for any reason, our clinical trials may be extended, delayed or terminated, and we may not be able to obtain marketing approval of our product candidates or otherwise advance our business. We cannot assure you that we will be able to properly manage our existing vendors or consultants or find other competent outside vendors and consultants on economically reasonable terms, or at all.

If we are not able to effectively manage growth and expand our organization, we may not be able to successfully implement the tasks necessary to further develop and commercialize our product candidates and, accordingly, we may not achieve our research, development and commercialization goals.

Our future success depends on our ability to retain key employees and to attract, retain and motivate qualified personnel and manage our human capital.

Our ability to compete in the highly competitive biotechnology and pharmaceutical industries depends upon our ability to attract, motivate and retain highly qualified managerial, scientific and medical personnel. We are highly dependent on the development and management expertise of the principal members of our management, scientific and clinical teams. We currently do not maintain key person insurance on these individuals. Although we have entered into employment agreements with our executive officers, each of them may terminate their employment with us at any time. In addition, we rely on consultants and advisors, including scientific and clinical advisors, to assist us in formulating our research and development and manufacturing strategy. Our consultants and advisors may be employed by employers other than us and may have commitments under consulting or advisory contracts with other entities that may limit their availability to us. Recruiting and retaining qualified finance and accounting personnel will also be critical to our success. We may not be able to attract or retain qualified personnel in the future due to the intense competition for a limited number of qualified personnel among pharmaceutical companies. Our workforce reduction announced in January 2023 may make retention of our current personnel both more important and more challenging. Many of the other pharmaceutical companies against which we compete have greater financial and other resources, different risk profiles and a longer history in the industry than we do. Our competitors may provide higher compensation, more diverse opportunities and/or better opportunities for career advancement. Any or all of these competing factors may limit our ability to continue to attract and retain high quality personnel, which could negatively affect our ability to successfully develop and commercialize our product candidates and to grow our business and operations as currently contemplated.

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Our employees, clinical trial investigators, CROs, CMOs, consultants, vendors and any potential commercial partners may engage in misconduct or other improper activities, including non-compliance with regulatory standards and requirements and insider trading.

We are exposed to the risk of fraud or other misconduct by our employees, clinical trial investigators, CROs, CMOs, consultants, vendors and any potential commercial partners. Misconduct by these parties could include intentional, reckless and/or negligent conduct or disclosure of unauthorized activities to us that violates: (i) FDA regulations or those of comparable foreign regulatory authorities, including those laws that require the reporting of true, complete and accurate information, (ii) manufacturing standards, (iii) federal and state health and data privacy, security, fraud and abuse, government price reporting, transparency reporting requirements, and other healthcare laws and regulations in the United States and abroad, (iv) sexual harassment and other workplace misconduct or (v) laws that require the true, complete and accurate reporting of financial information or data. Such misconduct could also involve the improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions and cause serious harm to our reputation.

We have adopted a code of conduct applicable to all of our employees, as well as a disclosure program and other applicable policies and procedures, but it is not always possible to identify and deter employee misconduct, 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 comply with these laws or regulations. 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 significant civil, criminal and administrative penalties, damages, fines, disgorgement, imprisonment, exclusion from government funded healthcare programs, such as Medicare, Medicaid and other federal healthcare programs, contractual damages, reputational harm, diminished profits and future earnings, additional integrity reporting and oversight obligations, and the curtailment or restructuring of our operations, any of which could adversely affect our ability to operate our business and our results of operations.

We are a virtual company and our business depends on the efficient and uninterrupted operation of our information technology systems and those of our third-party CROs, CMOs, or other vendors, contractors or consultants, may fail or suffer security breaches, cyberattacks, loss or leakage of data and other disruptions, which could result in a material disruption of our development programs, compromise sensitive information related to our business or prevent us from accessing critical information, potentially exposing us to liability or otherwise adversely affecting our business.

We are a virtual company, our business success depends on the security and efficient and uninterrupted operation of our information technology systems, and we may be unable to adequately protect our information technology systems from cyberattacks, which could result in the disclosure of confidential information, damage our reputation, and subject us to significant financial and legal exposure. We are increasingly dependent upon information technology systems, infrastructure and data to operate our business. In the ordinary course of business, we collect, store and transmit confidential information (including but not limited to intellectual property, proprietary business information, personal health information and sensitive personal information). It is critical that we do so in a secure manner to maintain the confidentiality and integrity of such confidential information. We also have outsourced elements of our operations to third parties, and as a result we manage a number of third-party CROs, CMOs, vendors, and other contractors and consultants who have access to our confidential information. System failures or outages could compromise our ability to perform these functions in a timely manner, which could harm our ability to conduct business or delay our financial reporting.

Despite the implementation of security measures, given their size and complexity and the increasing amounts of confidential information that they maintain, our internal information technology systems and those of our third-party CROs, CMOs, vendors and other contractors and consultants are potentially vulnerable to breakdown or other damage or interruption from service interruptions, system malfunction, accidents by our employees or third-party service providers, natural disasters, terrorism, war, global pandemics, and telecommunication and electrical failures, as well as security breaches from inadvertent or intentional actions by our employees, third-party CROs, CMOs, vendors, contractors, consultants, business partners and/or other third parties, or from cyberattacks or supply chain attacks by malicious third parties (including the deployment of harmful malware, ransomware, denial-of-service attacks, social engineering and other means to affect service reliability and threaten the confidentiality, integrity and availability of information), which may compromise our system infrastructure, or that of our third-party CROs, CMOs, vendors and other contractors and

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consultants, or lead to data leakage. The risk of a security breach or disruption, particularly through cyberattacks or cyber intrusion, including by computer hackers, foreign governments, and cyber terrorists, has generally increased as the number, intensity, and sophistication of attempted attacks and intrusions from around the world have increased. Remote work arrangements generally increase the attack surface available for exploitation, and the risk of a cybersecurity incident occurring, and our investment in risk mitigations against such an incident is generally increasing. For example, there has been an increase in phishing and spam email attacks as well as social engineering attempts from “hackers” hoping to use remote work arrangements to their advantage. We may not be able to anticipate all types of security threats, nor implement preventive measures effective against all such security threats. The techniques used by cyber criminals change frequently, may not be recognized until launched and can originate from a wide variety of sources, including outside groups such as external service providers, organized crime affiliates, terrorist organizations, or hostile foreign governments or agencies. Any breach, loss or compromise of clinical trial participant personal data may also subject us to civil fines and penalties, including under HIPAA, and other relevant state and federal privacy laws in the United States. If the information technology systems of our third-party CROs, CMOs, vendors and other contractors and consultants become subject to disruptions or security breaches, we may have insufficient recourse against such third parties and we may have to expend significant resources to mitigate the impact of such an event, and to develop and implement protections to prevent future events of this nature from occurring.

While we have not experienced any such system failure, accident or security breach to date, we cannot assure you that our data protection efforts and our investment in information technology will prevent significant breakdowns, data leakages, breaches in our systems, or those of our third-party CROs, CMOs, vendors and other contractors and consultants, or other cyber incidents that could have a material adverse effect upon our reputation, business, operations, or financial condition. For example, if such an event were to occur and cause interruptions in our operations, or those of our third-party CROs, CMOs, vendors and other contractors and consultants, it could result in a material disruption of our programs and the development of our product candidates could be delayed. In addition, the loss of clinical trial data for our product candidates could result in delays in our marketing approval efforts and significantly increase our costs to recover or reproduce the data. Furthermore, significant disruptions of our internal information technology systems or those of our third-party CROs, CMOs, vendors and other contractors and consultants, or security breaches could result in the loss, misappropriation and/or unauthorized access, use, or disclosure of, or the prevention of access to, confidential information (including trade secrets or other intellectual property, proprietary business information, and sensitive personal information), which could result in financial, legal, business and reputational harm to us.

A security breach may cause us to breach customer contracts. Our agreements with certain customers may require us to use industry-standard or reasonable measures to safeguard sensitive personal information or confidential information. A security breach could lead to claims by our customers, their end users, or other relevant stakeholders that we have failed to comply with such legal or contractual obligations. As a result, we could be subject to legal action or our customers could end their relationships with us. There can be no assurance that the limitations of liability in our contracts would be enforceable or adequate or would otherwise protect us from liabilities or damages.

In addition, litigation resulting from security breaches may adversely affect our business. Unauthorized access to our platform, systems, networks, or physical facilities could result in litigation with our customers, our customers’ end users, or other relevant stakeholders. These proceedings could force us to spend money in defense or settlement, divert management’s time and attention, increase our costs of doing business, or adversely affect our reputation. We could be required to fundamentally change our business activities and practices or modify our solutions and/or platform capabilities in response to such litigation, which could have an adverse effect on our business. If a security breach were to occur and the confidentiality, integrity or availability of our data or the data of our partners, our customers or our customers’ end users was disrupted, we could incur significant liability, or our platform, systems or networks may be perceived as less desirable, which could negatively affect our business and damage our reputation.

We may not have adequate insurance coverage with respect to security breaches or disruptions. The successful assertion of one or more large claims against us that exceeds our available insurance coverage, or results in changes to our insurance policies (including premium increases or the imposition of large deductible or co-insurance requirements), could have an adverse effect on our business. Even claims that ultimately are unsuccessful could result in our expenditure of funds in litigation, divert management’s time and other resources, and harm our reputation. In addition, we cannot be sure that our existing insurance coverage and coverage for errors and omissions will continue to be available on acceptable terms or that our insurers will not deny coverage as to any future claim.

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Currently, we carry business interruption coverage to mitigate certain potential losses, but this insurance is limited in amount and may not be sufficient in type or amount to cover us against claims related to a cybersecurity breach and related business and system disruptions. We cannot be certain that such potential losses will not exceed our policy limits, insurance will continue to be available to us on economically reasonable terms, or at all, or any insurer will not deny coverage as to any future claim. In addition, we may be subject to changes in our insurance policies, including premium increases or the imposition of large deductible or co-insurance requirements.

We are subject to stringent and changing laws, regulations, rules, policies, standards, and contractual obligations related to privacy and data security. Our actual or perceived failure to comply with such obligations could lead to government enforcement actions (which could include civil or criminal penalties), private litigation and/or adverse publicity and could negatively affect our operating results and business.

We and any potential collaborators may be subject to federal, state and other data protection laws and regulations (i.e., laws and regulations that address privacy and data security). The regulatory framework for privacy, data security and data transfers worldwide is rapidly evolving and there has been an increasing focus on privacy and data protection issues with the potential to affect our business and as a result, interpretation and implementation standards and enforcement practices are likely to remain uncertain for the foreseeable future. Failure to comply with any of these laws and regulations could result in enforcement actions against us, including fines, public censure, claims for damages by affected individuals, damage to our reputation and loss of goodwill, any of which could have a material adverse effect on our business.

In the United States, numerous federal and state laws and regulations, including federal and state health information privacy laws, data breach notification laws, and consumer protection laws (e.g., Section 5 of the Federal Trade Commission Act), that govern the collection, use, disclosure and protection of health-related and other personal information could apply to our operations or the operations of our collaborators. In addition, we may obtain health information from third parties (including research institutions from which we obtain clinical trial data) that are subject to privacy and security requirements under HIPAA, as amended by HITECH and other laws. Depending on the facts and circumstances, we could be subject to penalties if we obtain, use, or disclose personal health information maintained by a HIPAA-covered entity in a manner that is not authorized or permitted by HIPAA. Additionally, the SEC and many jurisdictions have enacted or may enact laws and regulations requiring companies to disclose or otherwise provide notifications regarding data security breaches. For example, the SEC adopted cybersecurity risk management and disclosure rules, which require the disclosure of information pertaining to cybersecurity incidents and cybersecurity risk management, strategy and governance.

In addition, the state of California enacted the CCPA, which imposes obligations on businesses to which it applies. These obligations include, but are not limited to, providing specific disclosures in privacy notices and affording California residents certain rights related to their personal data. Although the CCPA exempts some data processed in the context of clinical trials, the CCPA could increase compliance costs and potential liability. In addition, CPRA, which went into effect in January 2023, imposes additional obligations on companies covered by the legislation and significantly modifies the CCPA, including by expanding consumers’ rights with respect to certain sensitive personal information. The CPRA also creates a new state agency that is vested with authority to implement and enforce the CCPA and CPRA. Virginia’s Consumer Data Protection Act, which took effect in January 2023, requires businesses subject to the legislation to conduct data protection assessments in certain circumstances and requires opt-in consent from consumers to acquire and process their sensitive personal information, which includes information revealing a consumer’s physical and mental health diagnosis and genetic and biometric information that can identify a consumer. In addition, Colorado enacted the Colorado Privacy Act, and Connecticut enacted the Connecticut Data Privacy Act, each of which took effect in July 2023, and Utah enacted the Consumer Privacy Act, which became effective in December 2023, and each of these laws may increase the complexity, variation in requirements, restrictions and potential legal risks, and could require increased compliance costs and changes in business practices and policies. Other states have also enacted, or proposed, or are considering proposing, data privacy laws, which could further complicate compliance efforts, increase our potential liability and adversely affect our business.

Additionally, laws, regulations, rules and standards in many foreign jurisdictions apply broadly to the collection, use, retention, security, disclosure, transfer and other processing of personal information, which may impose significant compliance obligations on us. For example, in the EU, the processing of personal data, is governed by the provisions of the General Data Protection Regulation (the “GDPR”).

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In May 2018, the GDPR took effect in the European Economic Area (the “EEA”). The GDPR governs the collection, use, disclosure, transfer or other processing of personal data of natural persons. Among other things, the GDPR imposes strict obligations on the ability to process health-related and other personal data of data subjects in the EEA, including in relation to use, collection, analysis and transfer (including cross-border transfers) of such personal data. The GDPR includes requirements relating to the consent of the individuals to whom the personal data relates, including detailed notices for clinical trial subjects and investigators. The GDPR also includes certain requirements regarding the security of personal data and notification of data processing obligations or security incidents to appropriate data protection authorities or data subjects, as well as requirements for establishing a lawful basis on which personal data can be processed. In addition, the GDPR increases the scrutiny of cross-border transfers of personal data from clinical trial sites located in the EEA to the other jurisdictions that the European Commission does not recognize as having “adequate” data protection laws, and imposes substantial fines for breaches and violations (up to the greater of €20 million or 4% of our consolidated annual worldwide gross revenue). Notably, the United States is one such country as of January 1, 2024, although effective July 10, 2023, the new EU-U.S. Data Privacy Framework (“DPF”) has been recognized as adequate under EU law to allow transfers of personal data from the EU (as well as the United Kingdom and Switzerland) to certified companies in the United States. However, the DPF is likely to face legal challenge at the Court of Justice of the European Union which could cause the legal requirements for personal data transfers from the Europe to the United States to become uncertain once again. We will monitor these legal developments and continue to use best practices to follow established European legal standards to conduct cross-border transfer of personal data. Additionally, following the withdrawal by the UK from the EU and the EEA, companies must comply with both the GDPR and the UK GDPR as incorporated into UK national law, the latter regime having the ability to separately fine up to the greater of £17.5 million or 4 percent of global turnover. Further, recent legal developments in Europe and the UK have created complexity and compliance uncertainty regarding certain transfers of information from the UK and EEA to the United States. For example, on June 16, 2020, the Court of Justice of the EU (the “CJEU”), declared the EU-U.S. Privacy Shield framework (the “Privacy Shield”), to be invalid. As a result, Privacy Shield is no longer a valid mechanism for transferring personal data from the EEA to the United States. Moreover, it is uncertain whether the standard contractual clauses will also be invalidated by the European courts or legislature, which seems possible given the rationale behind the CJEU’s concerns about U.S. law and practice on government surveillance. The UK GDPR and EU GDPR also confer 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.

We also may make public statements about our use and disclosure of personal information through our privacy policy and press statements. Although we endeavor to comply with our public statements and documentation, we may at times fail to do so or be alleged to have failed to do so. Despite our efforts, we may not be successful in achieving compliance if our employees or vendors fail to comply with our policies, certifications, and documentation. The publication of our privacy policy and other statements that provide promises and assurances about data privacy and security can subject us to potential government or legal action if they are found to be deceptive, unfair or misrepresentative of our actual practices. Any failure, real or perceived, by us to comply with our posted privacy policies or with any legal or regulatory requirements, standards, certifications or orders or other privacy or consumer protection-related laws and regulations applicable to us could cause our customers to reduce their use of our solutions and services and could materially and adversely affect our business, results of operations, financial condition, cash flows and prospects.

Compliance with U.S. and foreign data protection laws and regulations could require us to take on more onerous obligations in our contracts, restrict our ability to collect, transfer, use and disclose data, or in some cases, impact our ability to operate in certain jurisdictions. Failure to comply with U.S. and foreign data protection laws and regulations could result in government enforcement actions (which could include civil, criminal, and administrative penalties), private litigation and/or adverse publicity and could negatively affect our operating results and business. Moreover, clinical trial subjects about whom we or our potential collaborators obtain information, as well as the providers who share this information with us, may contractually limit our ability to use and disclose the information. Claims that we have violated individuals’ privacy rights, failed to comply with data protection laws, or breached our contractual obligations, even if we are not found liable, could be expensive and time-consuming to defend and could result in adverse publicity that could harm our business.

We or the third parties upon whom we depend may be adversely affected by natural disasters and our business continuity and disaster recovery plans may not adequately protect us from a serious disaster.

Any unplanned event, such as flood, fire, explosion, earthquake, extreme weather condition, public health epidemic, power shortage, telecommunication failure or other natural or manmade accidents or incidents that result in us being

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unable to fully utilize our facilities, or the manufacturing facilities of our third-party manufacturers, may have a material and adverse effect on our ability to operate our business, particularly on a daily basis, and have significant negative consequences on our financial and operating conditions. Extreme weather conditions or other natural disasters could further disrupt our operations and have a material and adverse effect on our business, financial condition, results of operations and prospects. If a natural disaster, power outage or other event occurred that prevented us from using all or a significant portion of our facilities, that damaged critical infrastructure, such as our research facilities or the manufacturing facilities of our third-party manufacturers, or that otherwise disrupted operations, it may be difficult or, in certain cases, impossible, for us to continue our business for a substantial period of time.

Operating as a virtual company, our employees conduct business outside of any leased or owned facilities. These locations may be subject to additional security and other risk factors due to the limited control of our employees. The disaster recovery and business continuity plans we have in place may prove inadequate in the event of a serious disaster or similar event. We may incur substantial expenses as a result of the limited nature of our disaster recovery and business continuity plans, which could have a material adverse effect on our business. As part of our risk management policy, we maintain insurance coverage at levels that we believe are appropriate for our business. However, in the event of an accident or incident at these facilities, we cannot assure you that the amounts of insurance will be sufficient to satisfy any damages and losses. If our facilities, or the manufacturing facilities of our third-party manufacturers, are unable to operate because of an accident or incident or for any other reason, even for a short period of time, any or all of our research and development programs may be harmed. Any business interruption could have a material and adverse effect on our business, financial condition, results of operations and prospects.

Changes in tax laws or regulations that are applied adversely to us may have a material adverse effect on our business, cash flow, financial condition or results of operations.

New income, sales, use or other tax laws, statutes, rules, regulations or ordinances could be enacted at any time, which could adversely affect our business operations and financial performance. Further, existing tax laws, statutes, rules, regulations or ordinances could be interpreted, changed, modified or applied adversely to us. For example, the TCJA enacted many significant changes to U.S. tax laws. It is uncertain if and to what extent various states will conform to the TCJA, the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”), or any other newly enacted federal tax legislation. Changes in corporate tax rates, the realization of net deferred tax assets relating to our operations, the taxation of foreign earnings or future reform legislation could have a material impact on the value of our deferred tax assets, could result in significant one-time charges, and could increase our future U.S. tax expense.

Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.

We have incurred substantial losses during our history and do not expect to become profitable in the near future, and we may never achieve profitability. Under the TCJA, unused U.S. federal net operating losses generated in tax years beginning after December 31, 2017, will not expire and may be carried forward indefinitely but the deductibility of such federal net operating losses may be limited to 80% of current year taxable income (without regard to certain deductions). It is uncertain if and to what extent various states will conform to the TCJA or the CARES Act.

In addition, both our current and our future unused losses and other tax attributes may be subject to limitation under Sections 382 and 383 of the U.S. Internal Revenue Code of 1986, as amended (the “Code”), if we undergo, or have undergone, an “ownership change,” generally defined as a greater than 50 percentage point change (by value) in our equity ownership by certain stockholders over a three-year period. We have not completed a Section 382 study to assess whether an ownership change has occurred or whether there have been multiple ownership changes since our formation due to the complexity and cost associated with such a study and the fact that there may be additional ownership changes in the future. As a result, if we undergo an ownership change (or if we previously underwent such an ownership change), our ability to use all of our pre-change net operating loss carryforwards and other pre-change tax attributes (such as research tax credits) to offset our post-change income or taxes may be limited. Similar provisions of state tax law may also apply to limit our use of accumulated state tax attributes. In addition, at the state level, there may be periods during which the use of net operating losses is suspended or otherwise limited, which could accelerate or permanently increase state taxes owed. As a result, even if we attain profitability, we may be unable to use all or a material portion of our net operating losses and other tax attributes, which could adversely affect our future cash flows.

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Risks related to intellectual property

Our success depends in large part on our ability and our licensors’ ability to protect our proprietary technologies that we believe are important to our business, including pursuing, obtaining and maintaining patent protection in the United States and other countries intended to cover the compositions of matter of our product candidates, their methods of use, related technologies and other inventions that are important to our business. In addition to patent protection, we also rely on trade secrets to protect aspects of our business that are not amenable to, or that we do not consider appropriate for, patent protection. If we do not adequately pursue, obtain, maintain, protect or enforce our intellectual property, third parties, including our competitors, may be able to erode or negate any competitive advantage we may have, which could harm our business and ability to achieve profitability.

The patent application and approval process is expensive, time-consuming and complex. We may not be able to file, prosecute and maintain all necessary or desirable patent applications at a reasonable cost or in a timely manner or in all jurisdictions. We also cannot predict whether the patent applications we are currently pursuing will issue as patents in any particular jurisdictions. It is also possible that we will fail to identify patentable aspects of our product candidates before it is too late to obtain patent protection. Moreover, depending on the terms of any license agreements to which we may become a party, we may not have the right to control the preparation, filing, and prosecution of patent applications, or to maintain the patents, covering technology licensed from third parties. Therefore, these patents and patent applications may not be prosecuted and enforced in a manner consistent with the best interests of our business. For example, CSPC has the sole right to control the preparation, filing, prosecution and maintenance of all patents and patent applications within the licensed patents and any jointly owned foreground intellectual property under the CSPC License Agreement.

Furthermore, the patent position of biotechnology and pharmaceutical companies generally is highly uncertain. No consistent policy regarding the breadth of claims allowed in biotechnology and pharmaceutical patents has emerged to date in the United States or in many foreign jurisdictions. The standards applied by the United States Patent and Trademark Office (the “USPTO”), and foreign patent offices in granting patents are not always applied uniformly or predictably. In addition, the determination of patent rights with respect to biological and pharmaceutical products commonly involves complex legal and factual questions, which have in recent years been the subject of much litigation. As a result, the issuance, scope, validity, enforceability and commercial value of our patent rights are highly uncertain. Thus, we cannot offer any assurances about which, if any, patents will be issued, the breadth of any such patents, whether any issued patents will be found invalid and unenforceable or will be threatened by third parties or whether any issued patents will effectively prevent others from commercializing competing technologies and product candidates. While we have filed patent applications covering aspects of seribantumab, we currently have only one U.S. application, as well as a corresponding Patent Cooperation Treaty (“PCT”) application, specifically covering the use of seribantumab to treat patients with tumors harboring an NRG1 fusion according to our CRESTONE clinical dosing regimen. Any patents issuing from these published applications would expire in 2042, subject to any disclaimers or extensions.

Our pending patent applications cannot be enforced against third parties practicing the technology claimed in such applications unless and until at least one patent issues from such applications. Assuming the other requirements for patentability are met, currently, the first to file a patent application is generally entitled to the patent. However, prior to March 16, 2013, in the United States, the first to invent was entitled to the patent. Publications of discoveries in the scientific literature often lag behind the actual discoveries, and patent applications in the United States and other jurisdictions are typically not published until 18 months after filing, or in some cases not at all. Since patent applications in the United States and most other countries are confidential for a period of time after filing, and some remain so until issued, we cannot be certain that we were the first to file or invent (prior to March 16, 2013) any patent application related to our product candidates. In addition, we enter into non-disclosure and confidentiality agreements with parties who have access to confidential or patentable aspects of our research and development output, such as our employees, collaborators, CROs, CMOs, hospitals, independent treatment centers, consultants, independent contractors, suppliers, advisors and other third parties; however, any of these parties may breach the agreements and disclose such output before a patent application is filed, thereby jeopardizing our ability to seek patent protection. Furthermore, if third parties

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have filed patent applications related to our product candidates or technology, we may not be able to obtain our own patent rights to those product candidates or technology.

Moreover, because the issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, our patents or pending patent applications may be challenged in the courts or patent offices in the United States and abroad. For example, we may be subject to a third-party pre-issuance submission of prior art to the USPTO or become involved in post-grant review procedures, oppositions, derivations, revocation, reexaminations, inter partes review or interference proceedings, in the United States or elsewhere, challenging our patent rights or the patent rights of others. An adverse determination in any such submission, proceeding or litigation could reduce the scope of, or invalidate, our patent rights, 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 rights. Moreover, we may have to participate in interference proceedings declared by the USPTO to determine priority of invention or in post-grant challenge proceedings, such as oppositions in a foreign patent office, that challenge priority of invention or other features of patentability. Such challenges may result in loss of exclusivity or in our patent claims being narrowed, invalidated or held unenforceable, in whole or in part, which could limit our ability to stop others from using or commercializing similar or identical technology and products or limit the duration of the patent protection of our technology and products. Such challenges also may result in substantial cost and require significant time from our scientists and management, even if the eventual outcome is favorable to us. Any of the foregoing could have a material adverse effect on our business, financial condition, results of operations, and prospects.

In addition, given the amount of time required for the development, testing and regulatory review of new product candidates, our patents protecting such product candidates might expire before or shortly after such product candidates are commercialized. As a result, our intellectual property may not provide us with sufficient rights to exclude others from commercializing products similar or identical to ours. Moreover, some of our patents and patent applications may in the future be co-owned with third parties. If we are unable to obtain an exclusive license to any such third-party co-owners’ interest in such patents or patent applications, such co-owners may be able to license their rights to other third parties, including our competitors, and our competitors could market competing products and technology. In addition, we may need the cooperation of any such co-owners of our patents in order to enforce such patents against third parties, and such cooperation may not be provided to us. Any of the foregoing could have a material adverse effect on our competitive position, business, financial conditions, results of operations, and prospects.

Our pending and future patent applications may not result in patents being issued that protect our product candidates, in whole or in part, or which effectively prevent others from commercializing competitive products. Changes in either the patent laws or interpretation of the patent laws in the United States and other countries may diminish the value of our patents or narrow the scope of our patent protection. In addition, the laws of other countries may not protect our rights to the same extent or in the same manner as the laws of the United States. For example, European patent law restricts the patentability of methods of treatment of the human body more than United States law does.

Even if our patent applications issue as patents, they may not issue in a form that will provide us with any meaningful protection, prevent competitors or other third parties from competing with us or otherwise provide us with any competitive advantage. Moreover, the coverage claimed in a patent application can be significantly reduced before the patent is issued and its scope can be reinterpreted after issuance. Consequently, we do not know whether our product candidates will be protectable or remain protected by valid and enforceable patents. Our competitors and other third parties may be able to circumvent our patents by developing similar or alternative technologies or products in a non-infringing manner. Our competitors and other third parties may also seek approval to market their own products similar to or otherwise competitive with our products. Alternatively, our competitors or other third parties may seek to market generic versions or “follow-on” versions of any approved products by submitting NDAs or abbreviated NDAs under Section 505(b)(2) of the FDC Act, respectively, to the FDA during which they may claim that patents owned by us are invalid, unenforceable or not infringed. In these circumstances, we may need to defend or assert our patents, or both, including by filing lawsuits alleging patent infringement. In any of these types of proceedings, a court or other agency with jurisdiction may find our patents invalid or unenforceable, or that our competitors are competing in a non-infringing manner. Thus, even if we have valid and enforceable patents, these patents still may not provide protection against competing products or processes sufficient to achieve our business objectives. Any of the foregoing could have a material adverse effect on our competitive position, business, financial conditions, results of operations, and prospects.

Furthermore, future patents may be subject to a reservation of rights by one or more third parties. For example, to the extent the research resulting in future patent rights or technologies is funded in the future in part by the U.S. government,

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the government could have certain rights in any resulting patents and technology, including a non-exclusive license authorizing the government to use the invention or to have others use the invention on its behalf for non-commercial purposes. If the U.S. government then decides to exercise these rights, it is not required to engage us as its contractor in connection with doing so. These rights may also 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 may also exercise its march-in rights if it determines that action is necessary because we failed to achieve practical application of the government-funded technology, because action is necessary 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 government-funded inventions may be subject to certain requirements to manufacture products embodying such inventions in the United States. Any exercise by the government of aforementioned proprietary rights could harm our competitive position, business, financial condition, results of operations, and prospects.

Changes to patent laws in the United States and other jurisdictions could diminish the value of patents in general, thereby impairing our ability to protect our products.

As is the case with other biopharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining and enforcing patents in the biotechnology and pharmaceutical industries involves both technological and legal complexity and is therefore costly, time-consuming and inherently uncertain. Changes in either the patent laws or interpretation of the patent laws in the United States could increase the uncertainties and costs surrounding the prosecution of patent applications and the enforcement or defense of issued patents. Patent reform legislation in the United States and other countries, including the Leahy-Smith America Invents Act (the “Leahy-Smith Act”), signed into law in September 2011, could increase those uncertainties and costs. The Leahy-Smith Act includes a number of significant changes to U.S. patent law. These include provisions that affect the way patent applications are prosecuted, redefine prior art and provide more efficient and cost-effective avenues for competitors to challenge the validity of patents. For example, the Leahy-Smith Act allows third-party submission of prior art to the USPTO during patent prosecution and additional procedures to attack the validity of a patent by USPTO administered post-grant proceedings, including post-grant review, inter partes review, and derivation proceedings. In addition, the Leahy-Smith Act has transformed the U.S. patent system from a “first-to-invent” system to a “first-to-file” system in which, assuming that other requirements for patentability are met, the first inventor to file a patent application will be entitled to the patent on an invention regardless of whether a third party was the first to invent the claimed invention. The first-to-file provisions became effective on March 16, 2013. It is not yet clear what, if any, impact the Leahy-Smith Act will have on the operation of our business. However, the Leahy-Smith Act and its implementation could make it more difficult to obtain patent protection for our inventions and increase the uncertainties and costs surrounding the prosecution of our or our potential collaboration partners’ patent applications and the enforcement or defense of our or our future collaboration partners’ issued patents, all of which could harm our business, results of operations, financial condition and prospects.

In addition, the patent positions of companies in the development and commercialization of biologics are particularly uncertain. The U.S. Supreme Court has ruled on several patent cases in recent years, either narrowing the scope of patent protection available in certain circumstances or weakening the rights of patent owners in certain situations. This combination of events has created uncertainty with respect to the validity and enforceability of patents, once obtained. Additionally, there have been recent proposals for additional changes to the patent laws of the United States and other countries that, if adopted, could impact our ability to enforce our proprietary technology. Depending on future actions by the U.S. Congress, the U.S. courts, the USPTO and the relevant law-making bodies in other countries, the laws and regulations governing patents could change in unpredictable ways that could have a material adverse effect on our existing patent portfolio and weaken our ability to obtain new patents or to enforce our existing patents and patents that we might obtain in the future.

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

Competitors and other third parties may infringe, misappropriate or otherwise violate our patents, trademarks, copyrights, trade secrets or other intellectual property. To counter infringement, misappropriation or other violations, we may be required to file infringement, misappropriation or other violation claims, which can be expensive and time-consuming and divert the time and attention of our management and business and scientific personnel. In addition, many of our adversaries in these proceedings may have the ability to dedicate substantially greater resources to prosecuting these legal actions than we can.

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Any claims we assert against perceived infringers could provoke these parties to assert counterclaims against us alleging that we infringe, misappropriate or otherwise violate their patents or their other intellectual property, in addition to counterclaims asserting that our patents are invalid or unenforceable, or both. In patent litigation in the United States, counterclaims challenging the validity, enforceability or scope of asserted patents are commonplace. Similarly, third parties may initiate legal proceedings against us seeking a declaration that certain of our intellectual property is non-infringed, invalid or unenforceable. The outcome of any such proceeding is generally unpredictable.

In any 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 patent claims 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. If a defendant were to prevail on a legal assertion of invalidity or unenforceability of our patents covering one of our product candidates, we could lose at least a part, and perhaps all, of the patent protection covering such a product candidate. Competing drugs may also be sold in other countries in which our patent coverage might not exist or be as strong. If we lose a foreign patent lawsuit, alleging our infringement of a competitor’s patents, we could be prevented from marketing our product candidates in one or more foreign countries. 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.

Even if we establish infringement, the court may decide not to grant an injunction against further infringing activity and instead award only monetary damages, which may or may not be an adequate remedy. 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. There could also be public announcements of the results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could have a material adverse effect on the price of shares of our common stock. 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.

Furthermore, third parties may also raise invalidity or unenforceability claims before administrative bodies in the United States or foreign authorities, even outside the context of litigation. Such mechanisms include re-examination, inter partes review, post-grant review, interference proceedings, derivation proceedings and equivalent proceedings in foreign jurisdictions (e.g., opposition proceedings). Such proceedings could result in revocation, cancellation or amendment to our patents in such a way that they no longer cover and protect our product candidates. The outcome following legal assertions of invalidity and unenforceability is unpredictable. Grounds for a validity challenge could be an alleged failure to meet any of several statutory requirements, including lack of novelty, obviousness, non-enablement or written description. Grounds for an unenforceability assertion could be an allegation that someone connected with the prosecution of the patent withheld relevant information from the USPTO, or made a misleading statement, during prosecution of the patent. With respect to the validity of our patents, for example, we cannot be certain that there is no invalidating prior art of which we, our licensors, our patent counsel and the patent examiner were unaware during prosecution. Moreover, it is possible that prior art may exist that we are aware of but do not believe is relevant to our current or future patents, but that could nevertheless be determined to render our patents invalid. If a third party were to prevail on a legal assertion of invalidity or unenforceability, we could lose at least part, and perhaps all, of the patent protection on our product candidates. Any such loss of patent protection could have a material adverse impact on our business, financial condition, results of operations and prospects.

We and our licensors may not be able to effectively protect or enforce our intellectual property and proprietary rights throughout the world.

Filing, prosecuting and defending patents with respect to our product candidates in all countries throughout the world would be prohibitively expensive, and the laws of other countries may not protect our rights to the same extent as the

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laws of the United States. The requirements for patentability may differ in certain countries, particularly in developing countries. In addition, any future intellectual property license agreements may not always include worldwide rights. Consequently, competitors and other third parties may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and, further, may export otherwise infringing products to territories where we may obtain patent protection, but where patent enforcement is not as strong as that in the United States and where our ability to enforce our patents to stop infringing activities may be inadequate. These products may compete with our products in such territories and in jurisdictions where we do not have any patent rights or where any future patent claims or other intellectual property or proprietary rights may not be effective or sufficient to prevent them from competing with us, which could have a material adverse effect on our business, financial condition, results of operations and prospects.

Moreover, our ability to protect and enforce our intellectual property and proprietary rights may be adversely affected by unforeseen changes in foreign intellectual property laws. Additionally, the laws of some countries outside of the United States and Europe do not afford intellectual property protection to the same extent as the laws of the United States and Europe. Many companies have encountered significant problems in protecting and defending intellectual property and proprietary rights in certain jurisdictions. The legal systems of some countries, including, for example, India, China and other developing countries, do not view favorably the enforcement of patents and other intellectual property or proprietary rights, particularly those relating to biotechnology products, which could make it difficult for us to stop the infringement, misappropriation or other violation of our patents or other intellectual property or proprietary rights. For example, many countries have compulsory licensing laws under which a patent owner must grant licenses to third parties. Consequently, we may not be able to prevent third parties from practicing our inventions in certain countries outside the United States and Europe. In addition, many countries limit the enforceability of patents against government agencies or government contractors. In these countries, the patent owner may have limited remedies, which could materially diminish the value of such patent. If we are forced to grant a license to third parties with respect to any patents relevant to our business, our competitive position may be impaired, and our business, financial condition, results of operations, and prospects may be adversely affected. Proceedings to enforce our intellectual property and proprietary rights in foreign jurisdictions, whether or not successful, could result in substantial costs and divert our efforts and resources from other aspects of our business, could put our patents, trademarks or other intellectual property and proprietary rights at risk of being invalidated or interpreted narrowly, could put our 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. Furthermore, while we intend to protect our intellectual property and proprietary rights in major markets for our products, 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 products. Accordingly, our efforts to protect our intellectual property and proprietary rights in such countries may be inadequate.

If we are sued for infringing, misappropriating or otherwise violating intellectual property or proprietary rights of third parties, such litigation or disputes could be costly and time-consuming and could prevent or delay us from developing or commercializing our product candidates.

Our commercial success depends, in part, on our ability to develop, manufacture, market and sell our product candidates and use our proprietary technologies without infringing, misappropriating or otherwise violating the intellectual property and other proprietary rights of third parties. If any third-party patents, patent applications or other proprietary rights are found to cover our product candidates or any related companion or complementary diagnostics or their compositions, methods of use or manufacturing, we may be required to pay damages, which could be substantial, and we would not be free to manufacture or market our product candidates or to do so without obtaining a license, which may not be available on commercially reasonable terms, or at all.

We may in the future become party to, or threatened with, adversarial proceedings or litigation regarding intellectual property or proprietary rights with respect to our product candidates and technologies we use in our business. Our competitors or other third parties may assert infringement claims against us, alleging that our product candidates are covered by their patents. We cannot be certain that we do not infringe existing patents or that we will not infringe patents that may be granted in the future. Furthermore, because patent applications can take many years to issue and may be confidential for 18 months or more after filing, and because patent claims can be revised before issuance, there may be applications now pending which may later result in issued patents that may be infringed by the manufacture, use or sale of our product candidates. If a patent holder believes our product candidate infringes its patent rights, the patent holder may sue us even if we have received patent protection for our technology. Moreover, we may face patent infringement

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claims from non-practicing entities that have no relevant drug revenue and against whom our own patent portfolio may thus have no deterrent effect.

There is a substantial amount of intellectual property litigation in the biotechnology and biological product industries, and we may become party to, or threatened with, litigation or other adversarial proceedings regarding intellectual property or proprietary rights with respect to our product candidates, including interference proceedings before the USPTO. Third parties may assert infringement, misappropriation or other claims against us based on existing or future intellectual property or proprietary rights. The outcome of intellectual property litigation and other disputes is subject to uncertainties that cannot be adequately quantified in advance. The biological product and biotechnology industries have produced a significant number of patents, and it may not always be clear to industry participants, including us, which patents cover various types of products or methods of using or manufacturing products. The coverage of patents is subject to interpretation by the courts, and the interpretation is not always uniform. If we were sued for patent infringement, we would need to demonstrate that our product candidates, products or methods of use, manufacturing or other applicable activities either do not infringe the patent claims of the relevant patent or that the patent claims are invalid or unenforceable, and we may not be successful in doing so. However, proving invalidity or unenforceability is difficult. For example, in the United States, proving invalidity requires a showing of clear and convincing evidence to overcome the presumption of validity enjoyed by issued patents. Even if we believe third-party intellectual property claims are without merit, there is no assurance that a court would find in our favor on questions of infringement, validity, or enforceability. Even if we are successful in these proceedings, we may incur substantial costs and the time and attention of our management and business and scientific personnel could be diverted in pursuing these proceedings, which could significantly harm our business and operating results. In addition, we may not have sufficient resources to bring these actions to a successful conclusion.

If we are found to infringe, misappropriate or otherwise violate a third party’s intellectual property or proprietary rights and we are unsuccessful in demonstrating that such intellectual property or proprietary rights are invalid or unenforceable, we could be forced, including by court order, to cease developing, manufacturing or commercializing the infringing product candidate or product. Alternatively, we may be required to obtain a license from such third party in order to use the infringing technology and continue developing, manufacturing or marketing the infringing product candidate. However, we may not be able to obtain any required license on commercially reasonable terms or at all. Even if we were able to obtain such a license, it could be granted on non-exclusive terms, thereby giving our competitors and other third parties access to the same technologies licensed to us. In addition, we could be found liable for significant monetary damages, including treble damages and attorneys’ fees if we are found to have willfully infringed such third-party patent rights. A finding of infringement could prevent us from commercializing our product candidates or force us to cease some of our business operations, which could materially harm our business. Claims that we have misappropriated the confidential information or trade secrets of third parties could have a similar negative impact on our business, financial condition, results of operations and prospects.

We may be subject to claims by third parties asserting that our employees or consultants or we have misappropriated their intellectual property, or claiming ownership of what we regard as our own intellectual property.

Some of our employees and consultants are currently or have been previously employed at universities or at other biotechnology or biologics companies, including our competitors or potential competitors. These employees and consultants may have executed proprietary rights, non-disclosure and non-competition agreements, or similar agreements, in connection with such other current or previous employment. Although we try to ensure that our employees and consultants do not use the proprietary information or know-how of others in their work for us, we may be subject to claims that we or these individuals have used or disclosed intellectual property, including trade secrets or other proprietary information, of third parties. Litigation may be necessary to defend against such claims. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property or personnel or sustain damages. Such intellectual property 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 defending against such claims, litigation could result in substantial costs and be a distraction to our management. Any of the foregoing would have a material adverse effect on our business, financial condition, results of operations and prospects.

In addition, while it is our policy to require our employees, consultants and contractors who may be involved in the conception or 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, conceives or develops intellectual

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property that we regard as our own, which may result in claims by or against us related to the ownership of such intellectual property. In addition, such agreements may not be self-executing such that the intellectual property subject to such agreements may not be assigned to us without additional assignments being executed, and we may fail to obtain such assignments. In addition, such agreements may be breached. In addition, we have entered into in the past, and may enter into in the future, sponsored research agreements relating to our product candidates with various academic institutions. Some of these academic institutions may not have intellectual property assignments or similar agreements with their employees and consultants, which may result in claims by or against us related to ownership of any intellectual property. Accordingly, we may be forced to bring claims against third parties or defend claims that 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. Even if we are successful in prosecuting or defending against such claims, litigation could result in substantial costs and be a distraction to our senior management and scientific personnel, which would have a material adverse effect on our business, financial condition, results of operations and prospects.

Rights to improvements to our product candidates may be held by third parties, which could require us to obtain a license to such rights. Such a license may not be available on commercially reasonable terms, if at all.

We have entered into agreements with third parties to conduct clinical testing of our product candidates, which provide that improvements to our product candidates may be owned solely by a party or jointly between the parties. If we determine that rights to such improvements owned solely by a third party are necessary to commercialize our product candidates or maintain our competitive advantage, we may need to obtain a license from such third party in order to use the improvements and continue developing, manufacturing or marketing the product candidates. However, we may not be able to obtain any required license on commercially reasonable terms or at all. Even if we were able to obtain such a license, it could be granted on non-exclusive terms, thereby giving our competitors and other third parties access to the same technologies licensed to us. Failure to obtain a license on commercially reasonable terms or at all, or to obtain an exclusive license, could prevent us from commercializing our product candidates or force us to cease some of our business operations, which could materially harm our business. If we determine that rights to improvements jointly owned between us and a third party are necessary to commercialize our product candidates or maintain our competitive advantage, we may need to obtain an exclusive license from such third party. If we are unable to obtain an exclusive license to any such third-party co-owners’ interest in such improvements, such co-owners may be able to license their rights to other third parties, including our competitors, and our competitors could market competing products and technology. In addition, we may need the cooperation of any such co-owners of our intellectual property in order to enforce such intellectual property against third parties, and such cooperation may not be provided to us. Any of the foregoing could have a material adverse effect on our competitive position, business, financial conditions, results of operations and prospects.

We may be subject to claims challenging the inventorship of our patents and other intellectual property.

We or any of our licensors may be subject to claims that former employees, collaborators or other third parties have an interest in our owned or in-licensed patents, trade secrets, or other intellectual property as an inventor or co-inventor. For example, we or any of our licensors may have inventorship disputes arise from conflicting obligations of employees, consultants or others who are involved in developing our product candidates. Litigation may be necessary to defend against these and other claims challenging inventorship or our or any of our licensors’ ownership of our owned or in-licensed patents, trade secrets or other intellectual property. If we or any of our licensors fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights, such as exclusive ownership of, or right to use, intellectual property that is important to our product candidates. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to management and other employees. Any of the foregoing could have a material adverse effect on our business, financial condition, results of operations and prospects.

The term of our patents may be inadequate to protect our competitive position on our products.

Given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such candidates might expire before or shortly after such candidates are commercialized. For example, our wholly owned patent portfolio includes a patent family with claims directed to antibodies and related compositions covering seribantumab, as well as methods of treating cancer using such antibodies and compositions. The family contains three U.S. patents directed to seribantumab which expire in February 2028 and a fourth U.S. patent which

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expires in October 2029 (including 614 days of Patent Term Adjustment), subject to any disclaimers or extensions. The family also contains a pending U.S. application, which if issued, would expire in February 2028, subject to any disclaimers or extensions. In addition, the above-discussed patent family includes granted patents in China, Europe, Hong Kong, Israel, and Japan with claims directed to compositions of matter covering seribantumab and related methods of therapy. These patents expire in February 2028, subject to any disclaimers or extensions. Depending upon the timing, duration and other factors relating to any FDA marketing approval we receive for seribantumab, one or more of our U.S. patents may be eligible for limited patent term extension under the Drug Price Competition and Patent Term Restoration Action of 1984 (the “Hatch-Waxman Amendments”). We expect to seek extensions of patent terms in the United States and, if available, in other countries where we are prosecuting patents. In the United States, the Hatch-Waxman Amendments permit a patent term extension of up to five years beyond the normal expiration of the patent, limited to the approved indication (or any additional indications approved during the period of extension), as compensation for patent term lost to the regulatory review process during which the sponsor was unable to commercially market its new product. 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 applicable to an approved drug is eligible for the extension and only those claims covering the approved drug, a method for using it, or a method for manufacturing it may be extended, and the application for the extension must be submitted prior to the expiration of the patent. However, the applicable authorities, including the FDA and the USPTO in the United States, and any equivalent regulatory authority in other countries, may not agree with our assessment of whether such extensions are available for our patents, may refuse to grant extensions to our patents, or may grant more limited extensions than we request. We may not be granted an extension because of, for example, failing to exercise due diligence during the testing phase or regulatory review process, failing to apply within applicable deadlines, failing to apply prior to expiration of relevant patents, or otherwise failing to satisfy applicable requirements. If we are unable to obtain patent term extension or the term of any such extension is less than we request, our competitors and other third parties may be able to obtain approval of competing products following our patent expiration and take advantage of our investment in development and clinical trials by referencing our clinical and preclinical data and launch their product earlier than might otherwise be the case. Any of the foregoing would have a material adverse effect on our business, financial condition, results of operations and prospects.

Obtaining and maintaining our patent protection depends on compliance with various procedural, documentary, fee payment and other requirements imposed by governmental patent offices, and our patent protection could be reduced or eliminated for noncompliance with these requirements.

Periodic maintenance fees, renewal fees, annuity fees and various other government fees on any issued patent are due to be paid to the USPTO and patent offices in foreign countries in several stages over the lifetime of the patent. The USPTO and patent offices in foreign countries require compliance with a number of procedural, documentary, fee payment and other requirements during the patent application process. We may rely on our licensors, such as CSPC, to pay these fees due to U.S. and non-U.S. patent agencies and to comply with these other requirements with respect to any licensed patents and patent applications. While an inadvertent lapse can be cured by payment of a late fee or by other means in accordance with the applicable rules, there are situations in which noncompliance can result in abandonment or lapse of the patent or patent application, resulting in partial or complete loss of a patent or patent rights in the relevant jurisdiction. Non-compliance events that could result in abandonment or lapse of a patent or patent application include, but are not limited to, failure to respond to official actions within prescribed time limits, non-payment of fees and failure to properly legalize and submit formal documents. In such an event, our competitors and other third parties might be able to enter the market with similar or identical products of technology, which would have a material adverse effect on our business, financial condition, results of operations and 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.

We rely on proprietary know-how and trade secret protection and confidentiality agreements to protect proprietary know-how or trade secrets that are not patentable or that we elect not to patent. We seek to protect our trade secrets and proprietary know-how in part by entering into non-disclosure and confidentiality agreements with parties who have access to such knowledge, such as our employees, consultants, independent contractors, advisors, CMOs, CROs, hospitals, independent treatment centers, suppliers, collaborators and other third parties. We also enter into confidentiality and invention or patent assignment agreements with employees and certain consultants. However, we cannot guarantee that we have entered into such agreements with each party that may have or have had access to our trade secrets or proprietary know-how. Additionally, our confidentiality agreements and other contractual protections may not be adequate to protect our intellectual property from unauthorized disclosure, third-party infringement or

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misappropriation. 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 in the United States and certain foreign jurisdictions are less willing or unwilling to protect trade secrets. If any of our trade secrets were to be lawfully obtained or independently developed by a competitor or other third party, 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 or other third party, our business, financial condition, results of operations and prospects could be materially harmed.

Intellectual property rights do not necessarily address all potential threats.

The degree of future protection afforded by our and our licensors’ intellectual property rights is uncertain because intellectual property rights have limitations and may not adequately protect our business or permit us to maintain our competitive advantage. For example:

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others may be able to make products similar to any product candidates we may develop or utilize similarly related technologies that are not covered by the claims of the patents that we may license or may own in the future;

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we, or any licensors or collaborators, might not have been the first to make the inventions covered by the issued patent or pending patent application that we license or may own in the future;

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we, or any licensors or collaborators, might not have been the first to file patent applications covering certain of our or their inventions;

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others may independently develop similar or alternative technologies or duplicate any of our technologies without infringing, misappropriating or otherwise violating any of our owned or licensed intellectual property rights;

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it is possible that our pending patent applications or those that we may own in the future will not lead to issued patents;

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issued patents that we hold rights to may be held invalid or unenforceable, including as a result of legal challenges by our competitors or other third parties;

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our competitors or other third parties 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;

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we may not develop additional proprietary technologies that are patentable;

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the patents of others may harm our business; and

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we may choose not to file a patent in order to maintain certain trade secrets or know how, and a third party may subsequently file a patent covering such intellectual property.

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

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Risks related to our common stock

The market price of our common stock is likely to continue to be highly volatile, which could result in substantial losses for purchasers of our common stock.

The market price of our common stock is likely to continue to be highly volatile and subject to wide fluctuations in response to various factors, some of which we cannot control. As a result of this volatility, investors may not be able to sell their common stock at or above the price initially paid for the stock. The market price for our common stock may be influenced by many factors, including the other risks described in this section of this Annual Report and the following:

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enrollment or results of clinical trials of EO-3021 or our other product candidates, or those of our competitors, licensors or collaborators, or changes in the development status of our product candidates;

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regulatory or legal developments in the United States and other countries, especially changes in laws or regulations applicable to EO-3021 or our other product candidates;

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the success of competitive products or technologies;

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introductions and announcements of new products by us, our future commercialization partners, or our competitors, and the timing of these introductions or announcements;

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actions taken by regulatory agencies with respect to our products, clinical studies, manufacturing process or sales and marketing terms;

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actual or anticipated variations in our financial results or those of companies that are perceived to be similar to us;

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the success of our efforts to acquire or in-license additional technologies, products or product candidates;

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developments concerning any future collaborations, including but not limited to those with development and commercialization partners;

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market conditions in the biologics and biotechnology sectors;

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announcements by us or our competitors of significant acquisitions, strategic collaborations, joint ventures or capital commitments;

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developments or disputes concerning patents or other proprietary rights, including patents, litigation matters and our ability to obtain patent protection for our product candidates;

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our ability or inability to raise additional capital and the terms on which we raise it;

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the recruitment or departure of key personnel;

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changes in the structure of healthcare payment systems;

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actual or anticipated changes in earnings estimates or changes in stock market analyst recommendations regarding our common stock, other comparable companies or our industry generally;

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our failure or the failure of our competitors to meet analysts’ projections or guidance that we or our competitors may give to the market;

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fluctuations in the valuation of companies perceived by investors to be comparable to us;

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announcement and expectation of additional financing efforts;

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speculation in the press or investment community;

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share price and fluctuations of trading volume of our common stock;

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sales of our common stock by us, insiders or our stockholders;

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the concentrated ownership of our common stock;

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changes in accounting principles;

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terrorist acts, acts of war or periods of widespread civil unrest;

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political instability, including the prospect or occurrence of a federal government shutdown;

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natural disasters and other calamities; and

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In addition, the stock market in general, and the markets for pharmaceutical, biopharmaceutical and biotechnology stocks in particular, have experienced extreme price and volume fluctuations that have been often unrelated or disproportionate to the operating performance of the issuer. These broad market and industry factors may seriously harm the market price of our common stock, regardless of our actual operating performance. The realization of any of the above risks or any of a broad range of other risks, including those described in this “Risk Factors” section, could have a dramatic and adverse impact on the market price of our common stock.

In the past, securities class action litigation has often been brought against public companies following declines in the market price of their securities. This risk is especially relevant for biopharmaceutical companies, which have experienced significant stock price volatility in recent years. If we face such litigation, it could result in substantial costs and a diversion of management’s attention and our resources, which could harm our business.

A sale of a substantial number of shares of our common stock may cause the price of our common stock to decline.

Sales of a substantial number of shares of our common stock in the public market could occur at any time. If our stockholders sell, or the market perceives that our stockholders intend to sell, substantial amounts of our common stock in the public market, the market price of our common stock could decline significantly. The holders of a significant portion of our outstanding common stock have rights, subject to some conditions, to require us to file registration statements covering their shares or to include their shares in registration statements that we may file for ourselves or our stockholders.

We cannot predict what effect, if any, sales of our shares in the public market or the availability of shares for sale will have on the market price of our common stock. However, future sales of substantial amounts of our common stock in the public market, including shares issued upon exercise of our outstanding options, or the perception that such sales may occur, could adversely affect the market price of our common stock, even if our business is doing well.

We also expect that significant additional capital may be needed in the future to continue our planned operations. To raise capital, we may sell common stock, convertible securities or other equity securities in one or more transactions at prices and in a manner we determine from time to time. For example, in June 2023, we closed an underwritten public offering of (i) 17,810,000 shares of our common stock and pre-funded warrants to purchase up to an aggregate of 4,440,000 shares of common stock and (ii) accompanying warrants to purchase one share of common stock for each share of common stock or pre-funded warrant sold. This public offering and subsequent transactions may have an additional impact on the price of our common stock. To the extent that additional capital is raised through the sale and issuance of shares or other securities convertible into shares, our stockholders will be diluted. These sales, or the perception in the market that the holders of a large number of shares intend to sell shares, could reduce the market price of our common stock.

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Our principal stockholders and management own a significant percentage of our stock and will be able to exert significant control over matters subject to stockholder approval.

Based on the beneficial ownership of our common stock as of December 31, 2023, our executive officers, directors, holders of 5% or more of our capital stock and their respective affiliates beneficially hold the majority of our outstanding voting stock. As a result, these stockholders, if acting together, have significant control over the outcome of corporate actions requiring stockholder approval, including the election of directors, amendment of our organizational documents, any merger, consolidation or sale of all or substantially all of our assets and any other significant corporate transaction. The interests of these stockholders may not be the same as or may even conflict with your interests. For example, these stockholders could delay or prevent a change of control of our company, even if such a change of control would benefit our other stockholders, which could deprive our stockholders of an opportunity to receive a premium for their common stock as part of a sale of our company or our assets and might affect the prevailing market price of our common stock.

We are an “emerging growth company” and a “smaller reporting company” and we cannot be certain if the reduced reporting requirements applicable to “emerging growth companies” or “smaller reporting companies” will make our common stock less attractive to investors.

We are an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act. For as long as we continue to be an “emerging growth company,” we may take advantage of exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies, including (i) not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, as amended, or the Sarbanes-Oxley Act, (ii) reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements and (iii) exemptions from the requirements of holding nonbinding advisory stockholder votes on executive compensation and stockholder approval of any golden parachute payments not approved previously. In addition, as an “emerging growth company,” we are only required to provide two years of audited financial statements.

We could be an “emerging growth company” until December 31, 2026, although circumstances could cause us to lose that status earlier, including if we are deemed to be a “large accelerated filer,” which occurs when the market value of our common stock that is held by non-affiliates equals or exceeds $700.0 million as of the prior June 30, or if we have total annual gross revenue of $1.235 billion or more during any fiscal year before that time, in which cases we would no longer be an “emerging growth company” as of the following December 31, or if we issue more than $1.0 billion in non-convertible debt during any three-year period before that time, in which case we would no longer be an “emerging growth company” immediately. 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, including not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, if our revenues remain less than $100.0 million, and reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements. We cannot predict if investors will find our common stock less attractive because we may rely on these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and our share price may be more volatile.

Under the JOBS Act, “emerging growth companies” can also delay adopting new or revised accounting standards until such time as those standards apply to private companies. We have elected to take advantage of the benefits of this extended transition period. Our financial statements may therefore not be comparable to those of companies that comply with such new or revised accounting standards. Until the date that we are no longer an “emerging growth company” or affirmatively and irrevocably opt out of the exemption provided by Section 7(a)(2)(B) of the Securities Act, upon issuance of a new or revised accounting standard that applies to our financial statements and that has a different effective date for public and private companies, we will disclose the date on which adoption is required for non-emerging growth companies and the date on which we will adopt the recently issued accounting standard.

We will not receive a significant amount, or potentially any, additional funds upon the exercise of our pre-funded warrants; however, any exercise would increase the number of shares eligible for future resale in the public market and result in substantial dilution to our stockholders.

In June 2023, we issued pre-funded warrants to purchase a total of 4,440,000 shares of our common stock. Each pre-funded warrant is exercisable for $0.0001 per share of common stock underlying such pre-funded warrant, which may be

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paid by way of a cashless exercise, meaning that the holder may not pay a cash purchase price upon exercise, but instead would receive upon such exercise the net number of shares of common stock determined according to the formula set forth in the pre-funded warrant. Accordingly, we will not receive a significant amount, or potentially any, additional funds upon the exercise of the pre-funded warrants. To the extent such pre-funded warrants are exercised, additional shares of common stock will be issued for nominal or no additional consideration, which will result in substantial dilution to the then existing holders of our common stock and will increase the number of shares eligible for resale in the public market. Sales of substantial numbers of such shares in the public market could adversely affect the market price of the common stock, causing our stock price to decline.

There is no public market for our purchase warrants or the pre-funded warrants.

There is no public trading market for the purchase warrants or the pre-funded warrants issued in June 2023, and we do not expect a market to develop. In addition, we do not intend to apply to list the purchase warrants or the pre-funded warrants on any securities exchange or nationally recognized trading system, including the Nasdaq Global Select Market. Without an active market, the liquidity of the purchase warrants or the pre-funded warrants will be limited.

Additionally, each holder of a purchase warrant or pre-funded warrant will not be entitled to exercise any portion of any purchase warrant or pre-funded warrant which, upon giving effect to such exercise, would cause (i) the aggregate number of shares of our common stock beneficially owned by the holder (together with its affiliates) to exceed 4.99% or 9.99% of the number of shares of our common stock outstanding immediately after giving effect to the exercise, or (ii) the combined voting power of our securities beneficially owned by the holder (together with its affiliates) to exceed 4.99% or 9.99% of the combined voting power of all of our securities then outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the purchase warrant or pre-funded warrants, as applicable, unless such percentage is increased upon at least 61 days’ prior notice.

Anti-takeover provisions in our restated certificate of incorporation and amended and restated bylaws and under Delaware law could prevent or delay an acquisition of us, which may be beneficial to our stockholders, and may prevent attempts by our stockholders to replace or remove our current management and, therefore, decrease the trading price of our common stock.

Our restated certificate of incorporation and our amended and restated bylaws contain provisions that could delay or prevent a change in control of our company. These provisions could also make it difficult for stockholders to elect directors who are not nominated by current members of our Board of Directors (the “Board”) or take other corporate actions, including effecting changes in our management. These provisions:

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establish a classified Board so that not all members of our Board are elected at one time;

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permit only the Board to establish the number of directors and fill vacancies on the Board;

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provide that directors may only be removed “for cause” and only with the approval of two-thirds of our stockholders;

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require super-majority voting to amend some provisions in our restated certificate of incorporation and amended and restated bylaws;

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authorize the issuance of “blank check” preferred stock that our Board could use to implement a stockholder rights plan;

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eliminate the ability of our stockholders to call special meetings of stockholders;

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prohibit stockholder action by written consent, which requires all stockholder actions to be taken at a meeting of our stockholders;

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prohibit cumulative voting; and

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establish advance notice requirements for nominations for election to our Board or for proposing matters that can be acted upon by stockholders at annual stockholder meetings.

In addition, Section 203 of the Delaware General Corporation Law (the “DGCL”), may discourage, delay or prevent a change in control of our company. Section 203 imposes certain restrictions on mergers, business combinations and other transactions between us and holders of 15% or more of our common stock.

Any provision of our restated certificate of incorporation, amended and restated bylaws or Delaware law that has the effect of delaying or preventing a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our capital stock and could also affect the price that some investors are willing to pay for our common stock.

The exclusive forum provisions in our organizational documents may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or any of our directors, officers, or other employees, which may discourage lawsuits with respect to such claims.

Our restated certificate of incorporation, to the fullest extent permitted by law, provides that the Court of Chancery of the State of Delaware is the exclusive forum for: any derivative action or proceeding brought on our behalf; any action asserting a breach of fiduciary duty; any action asserting a claim against us arising pursuant to the DGCL, our restated certificate of incorporation, or our amended and restated bylaws; or any action asserting a claim against us that is governed by the internal affairs doctrine. This exclusive forum provision does not apply to suits brought to enforce a duty or liability created by the Exchange Act. It could apply, however, to a suit that falls within one or more of the categories enumerated in the exclusive forum provision.

This choice of forum provision may result in increased costs for investors to bring a claim. Further, this choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or any of our directors, officers, or other employees, which may discourage lawsuits with respect to such claims. Alternatively, if a court were to find the choice of forum provisions contained in our restated certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could harm our business, results of operations and financial condition.

Section 22 of the Securities Act creates concurrent jurisdiction for federal and state courts over all claims brought to enforce any duty or liability created by the Securities Act or the rules and regulations thereunder. Our amended and restated bylaws provide that the federal district courts of the United States of America, to the fullest extent permitted by law, shall be the exclusive forum for resolving any complaint asserting a cause of action arising under the Securities Act(“Federal Forum Provision”). Our decision to adopt a Federal Forum Provision followed a decision by the Supreme Court of the State of Delaware holding that such provisions are facially valid under Delaware law. While there can be no assurance that federal or state courts will follow the holding of the Delaware Supreme Court or determine that the Federal Forum Provision should be enforced in a particular case, application of the Federal Forum Provision means that suits brought by our stockholders to enforce any duty or liability created by the Securities Act must be brought in federal court and cannot be brought in state court.

Section 27 of the Exchange Act creates exclusive federal jurisdiction over all claims brought to enforce any duty or liability created by the Exchange Act or the rules and regulations thereunder. In addition, neither the exclusive forum provision nor the Federal Forum Provision applies to suits brought to enforce any duty or liability created by the Exchange Act. Accordingly, actions by our stockholders to enforce any duty or liability created by the Exchange Act or the rules and regulations thereunder must be brought in federal court.

Our stockholders will not be deemed to have waived our compliance with the federal securities laws and the regulations promulgated thereunder.

Any person or entity purchasing or otherwise acquiring or holding any interest in any of our securities shall be deemed to have notice of and consented to our exclusive forum provisions, including the Federal Forum Provision. These provisions may limit a stockholder’s ability to bring a claim in a judicial forum of their choosing for disputes with us or our directors, officers, or other employees, which may discourage lawsuits against us and our directors, officers, and other employees. If a court were to find either exclusive-forum provision in our restated certificate of incorporation to be

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inapplicable or unenforceable in an action, we may incur further significant additional costs associated with resolving the dispute in other jurisdictions, all of which could harm our business.

We will incur increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new compliance initiatives and corporate governance practices.

As a public company, we incur significant legal, accounting, compliance and other expenses that we did not incur as a private company. The Sarbanes-Oxley Act, the Dodd-Frank Wall Street Reform and Consumer Protection Act, the listing requirements of the Nasdaq Global Select Market and other applicable securities rules and regulations impose various requirements on public companies, including establishment and maintenance of effective disclosure and financial controls and corporate governance practices. Our management and other personnel need to devote a substantial amount of time to these compliance initiatives. Moreover, we expect these rules and regulations to substantially increase our legal and financial compliance costs and to make some activities more time-consuming and costly. For example, these rules and regulations have made it more expensive for us to obtain director and officer liability insurance and we may be required to incur substantial costs to maintain sufficient coverage. We cannot predict or estimate the amount or timing of additional costs we may incur to respond to these requirements. The impact of these requirements could also make it more difficult for us to attract and retain qualified persons to serve on our Board, our Board committees or as executive officers. The increased costs may require us to reduce costs in other areas of our business or increase the prices of our products once commercialized. Moreover, these rules and regulations are often subject to varying interpretations, in many cases due to their lack of specificity, and, as a result, their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in continuing uncertainty regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices.

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,” we will not be required to include an attestation report on internal control over financial reporting issued by our independent registered public accounting firm. In addition, for as long as we are a smaller reporting company with less than $100 million in annual revenue, we would be exempt from the requirement to obtain an external audit on the effectiveness of internal control over financial reporting provided in Section 404(b) of the Sarbanes-Oxley Act. To achieve compliance with Section 404 within the prescribed period, we will be engaged in a process to document and evaluate our internal control over financial reporting, which is both costly and challenging. In this regard, we will 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. This process will be time-consuming, costly and complicated. 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. In addition, if we are not able to continue to meet these requirements, we may not be able to remain listed on the Nasdaq Stock Market.

Because we do not anticipate paying any cash dividends on our capital stock in the foreseeable future, capital appreciation, if any, will be your sole source of gain.

We have never declared or paid cash dividends on our capital stock. We currently intend to retain all of our future earnings, if any, to finance the growth and development, operation and expansion of our business and do not anticipate declaring or paying any cash dividends for the foreseeable future. As a result, capital appreciation, if any, of our common stock will be your sole source of gain for the foreseeable future.

General risk factors

If securities or industry analysts do not publish research or reports about our business, or if they issue an adverse or misleading opinion regarding our stock, our stock price and trading volume could decline.

The trading market for our common stock will be influenced by the research and reports that industry or securities analysts publish about us or our business. If no or few securities or industry analysts commence or maintain coverage of us, the trading price for our common stock could be impacted negatively. In the event we obtain securities or industry

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analyst coverage, if any of the analysts who cover us issue an adverse or misleading opinion regarding us, our business model, our intellectual property or our stock performance, or if our preclinical studies and clinical trials and operating results fail to meet the expectations of analysts, our stock price would likely decline. If one or more of such analysts cease coverage of us or fail to publish reports on us regularly, we could lose visibility in the financial markets, which in turn could cause a decline in our stock price or trading volume.

Our disclosure controls and procedures may not prevent or detect all errors or acts of fraud.

We are subject to the periodic reporting requirements of the Exchange Act. We have designed our disclosure controls and procedures to reasonably assure that information we must disclose in reports we file or submit under the Exchange Act is accumulated and communicated to management, and recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC. However, any disclosure controls and procedures or internal controls and procedures, no matter how well-conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system will be met.

These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple errors or mistakes. For example, our directors or executive officers could inadvertently fail to disclose a new relationship or arrangement causing us to fail to make required related party transaction disclosures. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people or by an unauthorized override of the controls. Accordingly, because of the inherent limitations in a control system, misstatements due to error or fraud may occur and not be detected. In addition, we do not have a risk management program or processes or procedures for identifying and addressing risks to our business in other areas.

Failure to establish and maintain an effective system of internal controls could result in material misstatements of our financial statements or cause us to fail to meet our reporting obligations or fail to prevent fraud in which case, our stockholders could lose confidence in our financial reporting and the market price of our common stock could decline.

We are subject to the reporting requirements of the Exchange Act, the Sarbanes-Oxley Act and the rules and regulations of the Nasdaq Global Select Market. Under Section 404 of the Sarbanes-Oxley Act, we are required to furnish a report by our management on our internal control over financial reporting. This assessment must include disclosure of any material weaknesses identified by our management in our internal control over financial reporting. However, our independent registered public accounting firm will not be required to attest to the effectiveness of our internal control over financial reporting until our first annual report required to be filed with the SEC following the date we are no longer an EGC. At such time as we are required to obtain auditor attestation, if we then have a material weakness, we would receive an adverse opinion regarding our internal control over financial reporting from our independent registered accounting firm. To achieve compliance with Section 404 within the prescribed period, we will be engaged in a process to document and evaluate our internal control over financial reporting, which is both costly and challenging. In this regard, we will need to continue to dedicate internal resources, including through hiring additional financial and accounting personnel, 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. During our evaluation of our internal control, if we identify one or more material weaknesses in our internal control over financial reporting, we will be unable to assert that our internal control over financial reporting is effective.

In addition, our internal control over financial reporting will not prevent or detect all errors and all fraud. A control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system’s objectives will be met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and instances of fraud will be detected.

Furthermore, in connection with the future attestation process by our independent registered public accounting firm, we may encounter problems or delays in completing the implementation of any requested improvements and receiving a favorable attestation. If we cannot favorably assess the effectiveness of our internal control over financial reporting, or if our independent registered public accounting firm is unable to provide an unqualified attestation report on our internal controls, our stockholders could lose confidence in our reporting and the market price of our common stock could

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decline. In addition, we could be subject to sanctions or investigations by the Nasdaq Global Select Market, the SEC or other regulatory authorities.

We may be subject to securities litigation, which is expensive and could divert management attention.

The market price of our common stock may be volatile. The stock market in general, and pharmaceutical and biologics companies in particular, have experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of these companies. In the past, companies that have experienced volatility in the market price of their stock have been subject to securities class action litigation. We may be the target of this type of litigation in the future. Securities litigation against us could result in substantial costs and divert our management’s attention from other business concerns, which could seriously harm our business.

Item 1B. Unresolved Staff Comments

None.

Item 1C. Cybersecurity

We recognize the critical importance of maintaining the trust and confidence of our all of our stakeholders. We are a virtual company, and our business depends on the efficient and uninterrupted operation of our information technology systems and those of our third-party CROs, CMOs and other vendors, contractors and consultants. Our Board is actively involved in oversight of our risk management program, and cybersecurity represents an important component of our overall approach to enterprise risk management (“ERM”). Our cybersecurity policies, standards, processes and practices are fully integrated into our ERM program and are based on recognized frameworks established by the Center for Internet Security Controls Framework and other applicable industry standards, with quarterly review and adjustment of safeguards for continuous improvement. In general, we seek to address cybersecurity risks through a comprehensive, cross-functional approach that is focused on preserving the confidentiality, security and availability of the information that we collect and store by identifying, preventing and mitigating cybersecurity threats and effectively responding to cybersecurity incidents when they occur.

Risk Management and Strategy

As one of the critical elements of our overall ERM approach, our cybersecurity program is focused on the following key areas:

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Governance: As discussed in further detail under “Governance” below, our Board’s oversight of cybersecurity risk management is supported by our audit committee, which regularly interacts with our ERM function, our head of information technology and members of management.

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Collaborative Approach: We have implemented a comprehensive, cross-functional approach to identifying, preventing and mitigating cybersecurity threats and incidents, while also implementing controls and procedures that provide for the prompt escalation of certain cybersecurity incidents so that decisions regarding the public disclosure and reporting of such incidents can be made by management in a timely manner.

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Technical Safeguards: We deploy technical safeguards that are designed to protect our information systems from cybersecurity threats, including multifactor authentication, mobile device management, email filtering, firewalls, intrusion prevention and detection systems, anti-malware functionality and access controls, which are evaluated and improved through vulnerability assessments and cybersecurity threat intelligence.

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Incident Response and Recovery Planning: We have established and maintain comprehensive incident response and recovery plans to address our response to a cybersecurity incident, and such plans are tested and evaluated on a regular basis. This includes continuous security operations center monitoring of our systems and accounts. Furthermore, we maintain cyber liability insurance as an additional safeguard against a potential loss due to a cybersecurity incident.

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Third-Party Risk Management: We maintain a comprehensive, risk-based approach to identifying and overseeing cybersecurity risks presented by third parties, including vendors, service providers and other external users of our systems, as well as the systems of third parties that could adversely impact our business in the event of a cybersecurity incident affecting those third-party systems.

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Education and Awareness: We provide regular, mandatory training for personnel regarding cybersecurity threats as a means to equip our employees with effective tools to address cybersecurity threats, and to communicate our evolving information security policies, standards, processes and practices. We also perform regular phishing campaigns among our employees and provide convenient solutions for our employees to report suspicious messages.

We engage in the periodic assessment and testing of our policies, standards, processes and practices that are designed to address cybersecurity threats and incidents. These efforts include a wide range of activities, such as vulnerability management of both virtual network and physical laptops, regular security operations center reviews, regular Center for Internet Security scorecard reviews, user account audits of both employees and third parties and information technology general controls reviews. We also engage third parties to perform assessments on our cybersecurity measures to enable continuous improvement and adherence to best practices. The results of such assessments, audits and reviews are reported to the Audit Committee, and we adjust our cybersecurity policies, standards, processes and practices as necessary based on the information provided by these assessments, audits and reviews.

Governance

Our Board, in coordination with our audit committee, oversees our risk management process. The audit committee receives regular presentations and reports on cybersecurity risks, which address a wide range of topics including recent developments, evolving standards, vulnerability assessments, the threat environment, technological trends and information security considerations arising with respect to our peers and third parties. The Board and the audit committee will also receive prompt and timely information regarding any cybersecurity incident that meets established reporting thresholds, as well as ongoing updates regarding any such incident until it has been resolved. The audit committee regularly discusses our approach to cybersecurity risk management with our management team.

Our information technology personnel, in coordination with our management team, work collaboratively across the Company to implement a program designed to protect our information systems from cybersecurity threats and to promptly respond to any cybersecurity incidents in accordance with our incident response and recovery plans. Through ongoing communications with our entire employee basis and appropriate third party contractors, our head of information technology and management monitor the prevention, detection, mitigation and remediation of cybersecurity threats and incidents in real time, and will report such threats and incidents to the Audit Committee when appropriate.

Our head of information technology has over a decade of information technology experience in the biopharmaceutical industry and oversees our cybersecurity program. He has experience developing and leading cybersecurity programs, including evaluating and implementing tools and technologies that enable defense and response capabilities, and developing critical cybersecurity procedures and training and awareness programs.

Although we are subject to ongoing and evolving cybersecurity threats, we are not aware of any material cybersecurity threats, including as a result of any previous cybersecurity incidents, that have materially affected or are reasonably likely to affect us, including our business strategy, results of operations or financial condition.

Item 2. Properties

Not applicable.

Item 3. Legal Proceedings

At each reporting date, we evaluate whether or not a potential loss amount or a potential range of losses is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for contingencies. We expense as incurred the costs related to such legal proceedings. We are not a party to any material legal matters or claims and did not have contingency reserves established for any litigation liabilities as of December 31, 2023.

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Item 4. Mine Safety Disclosures

Not applicable.

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Market Information

Our common stock trades under the symbol “ELEV” on The Nasdaq Stock Market and has been publicly traded since June 25, 2021. Prior to this time, there was no public market for our common stock.

Holders of Our Common Stock

As of March 1, 2024, there were approximately 12 holders of record of shares of our common stock. This number does not include stockholders for whom shares are held in “nominee” or “street” name.

Dividends

We have never declared or paid any cash dividends on our capital stock. We currently intend to retain all available fund and any future earnings for use in the operation of our business and do not anticipate paying any dividends on our common stock in the foreseeable future. Any future determination to declare dividends will be made at the discretion of our Board and will depend on our financial condition, operation results, capital requirements, general business conditions and other factors that the Board may deem relevant.

Unregistered Sales of Equity Securities

None.

Use of Proceeds from Public Offering of Common Stock

On June 29, 2021, we closed our initial public offering of common stock under a registration statement on Form S-1 (333-256787) that was declared effective by the SEC on June 25, 2021.

We received net proceeds of $91.1 million, after deducting underwriting discounts, commissions, and other expenses of $8.9 million. On July 19, 2021, in connection with our IPO, the underwriters exercised the right to purchase 403,407 shares of our common stock at a price of $16.00 per share for net proceeds of $6.0 million, after deduction underwriting discounts of $0.5 million.

There has been no material change in the planned use of proceeds from our IPO as described in the registration statement on Form S-1.

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 related notes appearing elsewhere in this Annual Report. Some of the information contained in this discussion and analysis or set forth elsewhere in this Annual Report, 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, 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.

Overview

Our lead product candidate, EO-3021 (also known as SYSA1801 or CPO102), is an ADC designed to target Claudin 18.2 and is currently being evaluated in a Phase 1 clinical trial in patients with advanced, unresectable or metastatic solid tumors likely to express Claudin 18.2, including gastric, gastroesophageal junction, pancreatic or esophageal cancers. We have an active Investigational New Drug application (“IND”) for EO-3021 with the U.S. Food and Drug Administration (the “FDA”), and in August 2023, we announced that the first patient had been dosed in the Phase 1 clinical trial of EO-3021. In February 2024, we announced that the first patient had been dosed in Japan. We plan to provide an update from our ongoing Phase 1 trial in mid-2024, with additional data expected in the first half of 2025. In addition to our monotherapy approach, we plan to evaluate EO-3021 in combination with both immunotherapy and targeted agents, with further details on our planned Phase 1 combination study expected to be shared in the first half of 2024. EO-3021 was granted orphan drug designation by the FDA for the treatment of gastric cancer (including cancer of gastroesophageal junction) in November 2020 and for the treatment of pancreatic cancer in May 2021.

In July 2022, we entered into a license agreement with a subsidiary of CSPC Pharmaceutical Group Limited (collectively with its affiliates, “CSPC”) to develop and commercialize EO-3021 outside Greater China (the People’s Republic of China, Hong Kong, Macau and Taiwan) (the “CSPC License Agreement”). Pursuant to the terms of the CSPC License Agreement, we paid to CSPC a one-time, upfront payment of $27.0 million. CSPC will also be eligible to receive up to $148.0 million in potential development and regulatory milestone payments and up to $1.0 billion in potential commercial milestone payments plus royalties on net sales.

●

As of the data cutoff date of November 5, 2022, 33 patients with resistant/refractory solid tumors that expressed Claudin 18.2 were enrolled.

●

o

26 patients (78.8%) had gastric cancer; 7 patients (21.2%) had pancreatic cancer.

o

11 patients (33.3%) had been pretreated with ≥3 prior lines of therapy.

●

21 patients (gastric cancer n=17; pancreatic cancer n=4) were evaluable for efficacy per RECIST v1.1.

o

o

The overall ORR was 38.1% (8 PRs, including 4 confirmed PRs) and DCR was 57.1% (including 4 SDs).

●

Of the 33 patients enrolled at the time of data cutoff, treatment-related adverse events (“TRAEs”) of any grade occurred in 25 patients (75.8%), including eight (24.2%) TRAEs of ≥Grade 3.

o

The most common TRAEs (occurring in >20% of patients) were nausea (42.4%), vomiting (36.4%), dry eye syndrome (21.2%) and anemia (21.2%).

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o

Two dose-limiting toxicities of Grade 3 nausea and vomiting occurred at the 3 mg/kg IV Q3W dose.

o

No treatment-related deaths were reported.

Key findings from the preclinical study included:

●

EO-3021 retains antibody-dependent cell-mediated cytotoxicity and complement dependent cytotoxicity.

●

EO-3021 reduction in cell viability requires Claudin 18.2 expression in vitro with no effects seen on Claudin 18.2-negative cells.

●

EO-3021 demonstrated anti-tumor activity in in vivo xenograft models of pancreatic and gastric cancers expressing varying levels of Claudin 18.2.

o

o

EO-3021 outperformed standard of care chemotherapy in gastric and pancreatic cancer in vivo models.

Key findings from the clinical case study included:

●

Patient was treated with dose level 2, or 1.0 mg/kg EO-3021, IV Q3W for 12 cycles.

●

The best overall response, as evaluated per RECIST v1.1, was a confirmed partial response (66.7% maximal tumor reduction).

●

Duration of response was approximately 11 months.

In June 2023, we closed an underwritten public offering of (i) 17,810,000 shares of our common stock and pre-funded warrants to purchase up to an aggregate of 4,440,000 shares of common stock and (ii) accompanying warrants to purchase one share of common stock for each share of common stock or pre-funded warrant sold. The combined offering price to the public of each share of common stock and accompanying warrant was $2.2500. The combined offering price to the public of each pre-funded warrant and accompanying warrant was $2.2499. The accompanying warrants have an exercise price of $2.25 per share, are exercisable immediately, and will expire five years following the date of issuance. We received net proceeds of $46.5 million, after deducting underwriting discounts and commissions and other offering expenses of $3.6 million.

In July 2022, we entered into a loan and security agreement (the “Loan Agreement”) with K2 HealthVentures LLC (together with its affiliates, “K2HV,” and together with any other lender from time to time party thereto, the “Lenders”), as administrative agent for the Lenders, and Ankura Trust Company, LLC, as collateral agent for the Lenders. The Loan Agreement provides up to $50.0 million principal in term loans (the “Term Loan”) consisting of a first tranche of $30.0 million funded at closing and a subsequent second tranche of up to $20.0 million upon our request, subject to review by the Lenders of certain information from us and discretionary approval by the Lenders.

In January 2023, we announced that we paused further investment in the clinical development of seribantumab, an anti-HER3 mAb for solid tumors driven by neuregulin-1, or NRG1, fusions, a type of genomic alteration and oncogenic driver in solid tumors. As a result, further enrollment in our Phase 2 CRESTONE clinical trial evaluating seribantumab was paused. We intend to pursue further clinical development of seribantumab only in collaboration with a partner.

We were incorporated in April 2019. We have devoted substantial resources to in-licensing and developing EO-3021, developing seribantumab, building our intellectual property portfolio, business planning, raising capital and providing general and administrative support for these operations. To date, we have financed our operations through private placements of convertible preferred stock, public offerings of common stock and warrants and a debt facility.

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Since inception, we have incurred significant operating losses annually and on an aggregate basis. Our ability to generate product revenue sufficient to achieve profitability will depend on the successful development and eventual commercialization of one or more of our current or future product candidates. Our net losses were $45.7 million and $95.1 million for the years ended December 31, 2023 and 2022, respectively. As of December 31, 2023, we had an accumulated deficit of $196.0 million. These losses have resulted primarily from costs incurred in connection with research and development activities, acquisition, patent investment, and general and administrative costs associated with our operations. We expect to continue to incur significant expenses and increasing operating losses for at least the next several years.

We believe our cash, cash equivalents and marketable securities of $83.1 million as of December 31, 2023, together with the approximately $17.0 million in net proceeds raised under our ATM facility in January 2024, will enable us to meet our anticipated capital requirements into the fourth quarter of 2025. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect. We will need to raise additional capital in the future to continue developing the drugs in our pipeline and to commercialize any approved drug. We may seek to obtain additional financing in the future through the issuance of our common stock, through other equity or debt financings or through collaborations or partnerships with other companies. We may not be able to raise additional capital on terms acceptable to us, or at all, and any failure to raise capital as and when needed could compromise our ability to execute on our business plan.

Components of our Results of Operations

Operating Expenses

Research and Development Expenses

Our operating expenses have consisted solely of research and development costs and general and administrative costs. Research and development expenses consist primarily of costs related to our research activities, including the development of our product candidates, and costs incurred for the in-licensing of EO-3021. Our research and development expenses include:

●

employee-related expenses, including salaries, related benefits, and stock-based compensation expense for employees engaged in research and development activities;

●

external research and development expenses incurred in connection with the preclinical development of EO-3021, as well as the preclinical and clinical development of seribantumab, including expenses incurred under agreements with contract research organizations and consultants;

●

costs incurred with contract manufacturing organizations that manufacture drug products for use in our preclinical studies and clinical trials of seribantumab;

●

fees paid to consultants for services directly related to our product development and regulatory efforts; and

●

costs related to compliance with regulatory requirements related to conducting our clinical activity.

Research and development costs consist of salaries and benefits, including associated stock-based compensation, and fees paid to other entities that conduct certain research and development activities on our behalf. Research and development costs are expensed as incurred. We estimate preclinical study and clinical trial expenses based on the services performed pursuant to contracts with research institutions and contract research organizations, and clinical manufacturing organizations that conduct and manage preclinical studies and clinical trials on our behalf based on actual time and expenses incurred by them. Further, we accrue expenses related to clinical trials based on the level of patient activity according to the related agreement. We monitor patient enrollment levels and related activity to the extent reasonably possible and adjust estimates accordingly.

To date, our research and development expenses have primarily been incurred to advance EO-3021 and seribantumab. We expect that significant additional spending will be required to advance EO-3021 and other product candidates through clinical development. These expenses will primarily consist of expenses for the administration of clinical studies as well as manufacturing costs for clinical material supply. At this time, we cannot reasonably estimate or know the

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nature, timing and costs of the efforts that will be necessary to complete the preclinical and clinical development of any of our product candidates.

The following table provides a breakout of our research and development expenses by major categories of expense:


	Year Ended December 31,
	2023		2022		Change

	(in thousands)
Seribantumab	$	10,326	$	39,721	$	(29,395)
EO-3021		6,095		26,096		(20,001)
Unallocated and other research and development expenses		1,445		3,584		(2,139)
Personnel costs (including stock-based compensation)		7,568		9,316		(1,748)
Total research and development expenses	$	25,434	$	78,717	$	(53,283)

The successful development and commercialization of EO-3021 or our other product candidates is highly uncertain. The success of EO-3021 or any other product candidate will depend on several factors, including the following:

●

successful completion of preclinical studies and timely and successful enrollment of patients in, and completion of, clinical trials with favorable results;

●

demonstration of safety, efficacy and acceptable risk-benefit profiles of our product candidates to the satisfaction of the FDA and other regulatory agencies;

●

acceptance of an IND and a BLA by the FDA or other similar clinical trial applications by foreign regulatory authorities for clinical trials for our product candidates;

●

our ability, or that of our collaborators, to develop and obtain clearance or approval of companion or complementary diagnostics, on a timely basis, or at all;

●

receipt and related terms of marketing approvals from applicable regulatory authorities for our product candidates, including the completion of any required post-marketing studies or trials;

●

raising additional funds necessary to complete the clinical development of and commercialization of our product candidates;

●

successfully identifying and developing, acquiring or in-licensing additional product candidates to expand our pipeline;

●

making arrangements with third-party manufacturers, or establishing manufacturing capabilities, for both clinical and commercial supplies of our product candidates;

●

establishing sales, marketing and distribution capabilities and launching commercial sales of our products, if approved, whether alone or in collaboration with third parties;

●

acceptance of our products, if approved, by patients, the medical community and third-party payors;

●

effectively competing with other therapies available on the market or in development;

●

obtaining and maintaining third-party payor coverage and adequate reimbursement; and

●

maintaining a continued acceptable safety profile of any products following regulatory approval.

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Many of these factors are beyond our control, and it is possible that none of our product candidates will ever obtain regulatory approval even if we expend substantial time and resources seeking such approval. If we do not achieve one or more of these factors in a timely manner or at all, we could experience significant delays or an inability to successfully commercialize our product candidates, which would materially harm our business.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries and other related costs, including stock-based compensation, for personnel in our executive and administrative functions. General and administrative expenses also include legal fees relating to patent and corporate matters; professional fees for accounting, auditing, tax and consulting services, and insurance costs.

We anticipate that our general and administrative expenses will increase in the future as we support our continued research activities and development of our product candidates. We also expect to incur increased expenses, including costs of accounting, audit, legal, investor and public relations, directors’ and officers’ insurance, and regulatory and tax related services associated with maintaining compliance with exchange listings and SEC requirements. In addition, if we obtain regulatory approval for any of our product candidates, we expect to incur significant expenses related to building a sales and marketing team to support product sales, and marketing and distribution activities, to the extent that such activities are not supported by one or more third-party collaborators.

Other Expense, Net

Interest Income

Interest income consists of interest earned on our invested cash balances and associated with our marketable securities.

Interest Expense

Interest expense consists of interest expense on borrowings under the K2HV Loan Agreement, as well as amortization of debt discount and debt issuance costs.

Income Taxes

Since our inception, we have not recorded any income tax benefits for the net losses we have incurred each year or for our research and development tax credits, as we believe, based upon the weight of available evidence, that it is more likely than not that all of our net operating loss carryforwards and tax credits will not be realized. As of December 31, 2023, we had U.S. federal net operating loss carryforwards of $94.4 million which can be carried forward indefinitely. As of December 31, 2023, we had state net operating loss carryforwards of $7.7 million which begin to expire in 2035. As of December 31, 2023, we also had U.S. federal and state research and development tax credit carryforwards of $5.2 million and $0.8 million, respectively, which begin to expire in 2035. We have recorded a full valuation allowance against our net deferred tax assets at each balance sheet date.

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Restructuring Charges

The restructuring charges totaling $5.1 million in the first quarter of 2023 relate to costs incurred in respect of the reprioritization and realignment of resources, including $1.6 million of one-time termination and contractual termination benefits for severance, healthcare and related benefits.

Results of Operations

Comparison of the years ended December 31, 2023 and 2022:

The following table summarizes our results of operations for the years ended December 31, 2023 and 2022:


		Year Ended December 31,
		2023		2022		Change

	(in thousands)
Operating expenses:
Research and development		$	25,434	$	78,717	$	(53,283)
General and administrative			14,904		15,832		(928)
Restructuring charges			5,107		—		5,107
Total operating expenses			45,445		94,549		(49,104)
Loss from operations			(45,445)		(94,549)		49,104
Other expense, net			(229)		(506)		277
Loss before income taxes			(45,674)		(95,055)		49,381
Income tax expense			30		25		5
Net loss		$	(45,704)	$	(95,080)	$	49,376

Research and Development Expenses

Research and development expenses were $25.4 million for the year ended December 31, 2023, compared to $78.7 million for the year ended December 31, 2022. The decrease of $53.3 million was primarily due to a $25.7 million one-time upfront payment made in 2022, related to the CSPC License Agreement for the exclusive rights to develop and commercialize EO-3021 outside Greater China, a $24.5 million decrease in costs related to manufacturing clinical supply of seribantumab for use in the CRESTONE clinical trial, a decrease of $7.1 million in clinical trial expenses associated with the CRESTONE clinical trial, regulatory, consulting, and other expenses, and a $1.7 million decrease in personnel costs, including stock-based compensation, partially offset by a $5.7 million increase in clinical trial expenses associated with the EO-3021 clinical trial.

General and Administrative Expenses

General and administrative expenses were $14.9 million for the year ended December 31, 2023, compared to $15.8 million for the year ended December 31, 2022. The decrease of $0.9 million was primarily due to decreased directors’ and officers’ insurance.

Restructuring Charges

Restructuring charges were $5.1 million for the year ended December 31, 2023, and consisted primarily of charges related to the pipeline prioritization and realignment of resources to advance our EO-3021 product candidate, including $1.6 million of one-time termination and contractual termination benefits for severance, healthcare and related benefits.

Other Expense, Net

Other expense, net, was $0.2 million expense incurred for the year ended December 31, 2023, compared to $0.5 million of expense incurred for the year ended December 31, 2022. The components of other expense, net were as follows:

Interest Income

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Interest income of $3.9 million and $1.0 million for the years ended December 31, 2023 and 2022, respectively, was associated with the balance of marketable securities and increases in interest rates.

Interest Expense

Interest expense of $4.2 million and $1.5 million for the years ended December 31, 2023 and 2022, respectively, consisted primarily of cash and non-cash interest related to the K2HV Loan Agreement, which was entered in July 2022.

Comparison of the Years Ended December 31, 2022 and 2021

A discussion of changes in our results of operations during the year ended December 31, 2022 compared to the year ended December 31, 2021 has been omitted from this Annual Report on Form 10-K, but may be found in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on March 9, 2023, which discussion is incorporated herein by reference and which is available free of change on the SEC’s website at http://www.sec.gov.

Liquidity and Capital Resources

Since our inception, we have not generated any revenue from product sales or any other sources and have incurred significant operating losses. We have not yet commercialized any products and we do not expect to generate revenue from sales of any product candidates for several years, if ever.

In July 2022, we entered into a Sales Agreement (the “Sales Agreement”) with Cowen and Company, LLC (“Cowen”), under which we may offer and sell, from time to time, shares of common stock having aggregate gross proceeds of up to $50.0 million. In January 2024, we sold 5,777,527 million shares of common stock pursuant to the Sales Agreement, for net proceeds of $17.0 million, after deducting issuance costs.

Cash Flows

The following table summarizes our sources and uses of cash for each of the periods presented:


	Year Ended December 31,
	2023		2022

	(in thousands)
Statement of cash flows data:
Cash used in operating activities	$	(56,180)	$	(85,483)
Cash provided by (used in) investing activities		11,543		(44,398)
Cash provided by financing activities		47,975		29,514
Net increase (decrease) in cash and cash equivalents	$	3,338	$	(100,367)

Operating Activities

During the year ended December 31, 2023, net cash used in operating activities was $56.2 million, which consisted primarily of our net loss of $45.7 million, $13.7 million of cash used in changes in our operating assets and liabilities, and $0.9 million of net accretion of discounts on marketable securities, partially offset by $3.3 million of stock-based compensation expense and $0.7 million of non-cash interest expense. Changes in our operating assets and liabilities consisted primarily of a decrease of $5.9 million in accounts payable, a decrease of $5.7 million in accrued expenses, and an increase of $2.1 million in prepaid expenses and other current assets.

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During the year ended December 31, 2022, net cash used in operating activities was $85.5 million, which consisted primarily of our net loss of $95.1 million, partially offset by $6.3 million of cash provided by changes in our operating assets and liabilities, $3.2 million of stock-based compensation expense and net $0.1 million of non-cash interest and accretion of discounts on marketable securities. Changes in our operating assets and liabilities consisted primarily of an increase of $6.2 million in accrued expenses and an increase of $0.7 million in accounts payable, due to the timing of payments related to research and development costs, partially offset by an increase of $0.6 million in prepaid expenses and other current assets, due to increased insurance due to operating as a public company.

Investing Activities

During the year ended December 31, 2023, net investing activities consisted of $11.5 million of net cash proceeds from sales and maturities of marketable securities.

During the year ended December 31, 2022, net investing activities consisted of $44.3 million of net cash investment in marketable securities and $0.1 million of purchases of property and equipment.

Financing Activities

During the year ended December 31, 2023, net cash provided by financing activities was $48.0 million and consisted primarily of $46.5 million of proceeds from our underwritten public offering of common stock, pre-funded warrants and warrants and $1.5 million of proceeds from stock option exercises.

During the year ended December 31, 2022, net cash provided by financing activities was $29.5 million, due to $30.0 million of proceeds from issuance of long-term debt, partially offset by $0.5 million of payments of debt issuance costs .

Future Funding Requirements

We expect our expenses to increase substantially in connection with our ongoing activities, particularly as we advance the preclinical activities and clinical trials for EO-3021 and seek to develop, acquire or in-license additional product candidates. The timing and amount of our operating expenditures will depend largely on:

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the timing and progress of preclinical and clinical development activities;

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successful enrollment in and completion of clinical trials;

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the timing and outcome of regulatory review of our product candidates;

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the cost to develop companion or complementary diagnostics as needed for each of our product candidates;

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our ability to establish agreements with third-party manufacturers for clinical supply for our clinical trials and, if any of our product candidates are approved, commercial manufacturing;

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addition and retention of key research and development personnel;

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our efforts to enhance operational, financial and information management systems, and hire additional personnel, including personnel to support development of our product candidates;

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the costs and timing of future commercialization activities, including product manufacturing, marketing, sales and distribution, for any of our product candidates for which we obtain marketing approval;

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the legal patent costs involved in prosecuting patent applications and enforcing patent claims and other intellectual property claims; and

●

the terms and timing of any collaboration, license or other arrangement, including the terms and timing of any milestone payments thereunder.

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Our future capital requirements will depend on many factors, including:

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the progress, timing and results of preclinical studies and clinical trials for EO-3021 and our other product candidates;

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disruptions or delays in enrollment of our clinical trials;

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the extent to which we develop, in-license or acquire other pipeline product candidates or technologies;

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the number and development requirements of other future product candidates that we may pursue, and other indications for our current product candidates that we may pursue;

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the costs, timing and outcome of obtaining regulatory approvals of EO-3021 and our other product candidates and any companion or complementary diagnostics we may pursue;

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the scope and costs of making arrangements with third-party manufacturers, or establishing manufacturing capabilities, for both clinical and commercial supplies of our product candidates;

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the costs involved in growing our organization to the size needed to allow for the research, development and potential commercialization of our current or future product candidates;

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the costs associated with commercializing any approved product candidates, including establishing sales, marketing and distribution capabilities;

●

the costs associated with completing any post-marketing studies or trials required by the FDA or other regulatory authorities;

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the revenue, if any, received from any product candidates that receive marketing approval;

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the costs associated with potential product liability claims, including the costs associated with obtaining insurance against such claims and with defending against such claims; and

●

to the extent we pursue strategic collaborations, including collaborations to commercialize seribantumab or to develop any future product candidates, our ability to establish and maintain collaborations on favorable terms, if at all, as well as the timing and amount of any milestone or royalty payments we are required to make or are eligible to receive under such collaborations, if any.

We will not generate revenue from product sales unless and until we successfully complete clinical development and obtain regulatory approval for EO-3021 or our other product candidates. If we obtain regulatory approval for any of our product candidates, we expect to incur significant expenses related to developing our internal commercialization capability to support product sales, marketing and distribution.

Until such time as we can generate significant revenue from product sales, if ever, we expect to finance our operations through a combination of public or private equity or debt financings or other sources, which may include collaborations with third parties. Adequate additional financing may not be available to us on favorable terms, or at all. In addition, we may seek additional capital due to favorable market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans. If we are unable to raise capital or debt when needed or on

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favorable terms, we could be forced to delay, reduce or eliminate our research and development programs, our commercialization plans or other operations.

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 revenue from 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.

Contractual Obligations and Commitments

We enter into contracts in the normal course of business with various third parties for clinical trials, preclinical research studies and testing, manufacturing and other services and products for operating purposes. These contracts do not contain any minimum purchase commitments and provide for termination upon notice.

In May 2019, we entered into the Asset Purchase Agreement with the previous sponsor, pursuant to which we acquired all rights and interest to patents, know-how and inventory for assets related to seribantumab. If we are successful in finding a partner to develop and commercialize seribantumab, we may be obligated to pay the previous sponsor up to $54.5 million in development, regulatory and sales milestone payments pursuant to the terms of the asset purchase agreement. Additionally, in conjunction with the asset purchase agreement with the previous sponsor, we assumed the rights and obligations under certain collaboration and license agreements which may require the payment of milestones and/or royalties on future sales of seribantumab. We are currently unable to estimate the timing or likelihood of achieving these milestones or generating future product sales. See “Business—License, Asset Purchase and Collaboration Agreements” for additional information about these license agreements, including with respect to potential payments thereunder.

In July 2022, we entered into the Loan Agreement with K2HV, as administrative agent for the Lenders, and Ankura Trust Company, LLC, as collateral agent for the Lenders. The Loan Agreement provides up to $50.0 million principal in the Term Loan consisting of a first tranche of $30.0 million funded at closing and a subsequent second tranche of up to $20.0 million upon our request, subject to review by the Lenders of certain information from us and discretionary approval by the Lenders. In March 2024, we amended certain terms of the Loan Agreement with K2HV, including amending the amortization date of the Term Loan from March 1, 2025 to June 1, 2026.


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PART I

Item 1. Business		5

Item 1A. Risk Factors		27

Item 1B. Unresolved Staff Comments		82

Item 1C. Cybersecurity		82

Item 2. Properties		83

Item 3. Legal Proceedings		83

Item 4. Mine Safety Disclosures		84

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities		84

Item 6. [Reserved]		84

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations		85

Item 7A. Quantitative and Qualitative Disclosures About Market Risk		95

Item 8. Financial Statements and Supplementary Data		96

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure		122

Item 9A. Controls and Procedures		122

Item 9B. Other Information		123

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections		124

PART III

Item 10. Directors, Executive Officers and Corporate Governance		125

Item 11. Executive Compensation		125

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters		125

Item 13. Certain Relationships and Related Transactions, and Director Independence		125

Item 14. Principal Accountant’s Fees and Services		125

PART IV

Item 15. Exhibits and Financial Statement Schedules		125

Item 16. Form10-K Summary		129

SIGNATURES		130