S-1

(Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Offices)

(Name, Address, Including Zip Code, and Telephone Number, Including Area Code, of Agent for Service)

Approximate date of commencement of proposed sale to the public: As soon as practicable after this registration statement becomes effective.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box: ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

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

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 to Section 7(a)(2)(B) of the Securities Act. ☒

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

The information in this preliminary prospectus is not complete and may be changed. These securities may not be sold until the registration statement filed with the Securities and Exchange Commission is effective. This preliminary prospectus is not an offer to sell nor does it seek an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

We are offering 2,400,000 shares of our common stock. Our common stock is listed on the Nasdaq Global Market under the symbol “MIRM.” On January 3, 2020, the last reported sale price of our common stock as reported on the Nasdaq Global Market was $23.03 per share. The final public offering price will be determined through negotiation between us and the lead underwriters in the offering and the recent market price used throughout the prospectus may not be indicative of the actual offering price.

We have granted the underwriters the option to purchase up to an additional 360,000 shares of our common stock.

We are an “emerging growth company” as defined by the Jumpstart Our Business Startups Act of 2012, and as such, have elected to comply with reduced public company reporting requirements for this prospectus and may elect to comply with reduced public company reporting requirements in future filings.

Investing in our common stock involves risks. See “Risk Factors” section beginning on page 11.

Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the shares of common stock to purchasers against payment on or about , 2020 through the book entry facilities of The Depository Trust Company.

We are responsible for the information contained in this prospectus and in any free-writing prospectus we prepare or authorize. We have not authorized anyone to provide you with different information, and we take no responsibility for any other information others may give you. If anyone provides you with different or inconsistent information, you should not rely on it. We are not, and the underwriters are not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should not assume that the information contained in this prospectus is accurate as of any date other than the date on the front of this prospectus.

For investors outside of the United States: We have not, and the underwriters have not, done anything that would permit this offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than the United States. Persons outside of the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the shares of common stock and the distribution of this prospectus outside of the United States.

This prospectus includes our trademarks which are our property and are protected under applicable intellectual property laws. This prospectus also includes trademarks and trade names that are the property of other organizations. Solely for convenience, trademarks and trade names referred to in this prospectus appear without the ^® and ^™ symbols, but those references are not intended to indicate that we will not assert, to the fullest extent under applicable law, our rights, or that the applicable owner will not assert its rights, to these trademarks and trade names. We do not intend our use or display of other companies’ trade names or trademarks to imply a relationship with, or endorsement or sponsorship of us by, any other companies.

PROSPECTUS SUMMARY

This summary highlights information contained elsewhere in this prospectus. This summary does not contain all of the information you should consider before investing in our common stock. You should read this entire prospectus carefully, including the sections in this prospectus entitled “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and our consolidated financial statements and the related notes included elsewhere in this prospectus, before making an investment decision. Unless otherwise indicated, all references in this prospectus to “Mirum,” the “company,” “we,” “our,” “us” or similar terms refer to Mirum Pharmaceuticals, Inc. and our consolidated subsidiary.

Overview

We are a biopharmaceutical company focused on the development and commercialization of a late-stage pipeline of novel therapies for debilitating liver diseases. We focus on diseases for which the unmet medical need is high and the biology for treatment is clear. Our pipeline consists of two clinical-stage product candidates with mechanisms of action that have potential utility across a wide range of orphan cholestatic liver diseases. We are initially developing maralixibat for the treatment of pediatric patients with progressive familial intrahepatic cholestasis, or PFIC, and Alagille syndrome, or ALGS. Based on improvements in pruritus, or itching, and other disease markers observed in Phase 2 clinical trials, we commenced enrollment in the Phase 3 MARCH clinical trial in PFIC in the second quarter of 2019 and are planning to initiate a rolling submission of a New Drug Application, or NDA, for the treatment of pruritus associated with ALGS in the third quarter of 2020. We are developing volixibat for the treatment of adult patients with cholestatic liver diseases and expect to initiate clinical trials in these indications in 2020. In addition to data from ongoing clinical trials of maralixibat, we expect to complete enrollment in the MARCH clinical trial in the second quarter of 2020 and announce topline Phase 3 data in late-2020. We also expect to report clinical data for volixibat in 2022.

Recent Developments

Following an end-of-Phase 2 meeting with the U.S. Food and Drug Administration, or FDA, in May 2019, we requested a meeting with the FDA to continue discussion of the adequacy of the current data set of maralixibat to support an NDA submission for the treatment of pruritus associated with ALGS. At the request of the FDA, we prepared various analyses of the maralixibat data set in the third quarter of 2019, in particular of the ICONIC clinical trial as the potential pivotal study. These analyses were submitted to the FDA in advance of the meeting we had in November 2019. In parallel, in October 2019, we received a breakthrough therapy designation for maralixibat for the treatment of pruritus associated with ALGS in patients one year of age and older.

In October 2019, the FDA requested that we convert the meeting to a pre-NDA meeting and discuss the components and timeline of an NDA submission. During this meeting, we and the FDA reached consensus on a timeline for initiating a rolling submission of an NDA in the third quarter of 2020 and the details of various routine datasets to generate for the submission. We also met with the FDA to discuss chemistry, manufacturing and controls, or CMC, plans and our commercial supply chain strategy. We have initiated production of registration batches, and believe we will be in a position to provide the stability data required for NDA submission by the first quarter of 2021. Through the FDA interactions, we have an agreed plan for the components and timing of a rolling NDA. We expect the NDA submission to be complete in the first quarter of 2021, which will include the submission of the FDA requested CMC and stability data.

In addition, in November 2019, we were granted Rare Pediatric Disease Designation for maralixibat for ALGS, and as a result, we may qualify for the receipt of a priority review voucher if our NDA is approved before October 1, 2022.

cholangitis, or PSC, and healthy volunteers. The ALGS presentation was a four year update on the ICONIC clinical trial showing persistent significant improvements from baseline in serum bile acids, or sBA, pruritus, xanthomas and growth in patients remaining on study at week 191.

Overview of Cholestatic Liver Diseases

The liver is responsible for many vital body functions, including the regulation of bile acid synthesis and metabolism. The liver uses cholesterol to produce bile acids, which promote digestion and absorption of dietary fats and fat-soluble vitamins. Approximately 95% of bile acids recirculate back to the liver, and the remaining bile acids are excreted from the body in the feces. Apical sodium-dependent bile acid transporter, or ASBT, is present in the small intestine and mediates the uptake of bile acids in the intestines and recycles them back to the liver. Cholestasis is characterized by impaired flow of bile resulting in accumulation of toxic levels of bile acids in the liver. This leads to liver injury, progressive liver disease and, if left untreated, can result in fibrosis, cirrhosis, liver failure and death. Patients with cholestatic liver disease typically experience debilitating pruritus, which dramatically impacts quality of life and can lead to scarring, sleep deprivation, significant fatigue and psycho-social effects. ASBT inhibition results in more bile acids being excreted in the feces, leading to lower levels of bile acids systemically, thereby reducing bile acid mediated liver damage. This leads to improvements in liver function, pruritus and other symptoms of cholestatic liver diseases.

Our initial focus is on rare cholestatic liver diseases, including PFIC, ALGS, biliary atresia, or BA, PSC and intrahepatic cholestasis of pregnancy, or ICP. PFIC is a rare genetic disorder that causes progressive liver disease, which typically leads to liver failure. The disease is estimated to affect one in every 50,000 to 100,000 births in the United States and Europe, and we estimate that there are approximately 3,000 patients with PFIC in the United States and approximately 5,000 in Europe. Our initial focus is on the PFIC2 patient population, which accounts for approximately 60% of the PFIC patient population. PFIC2 is caused by a mutation in the ABCB11 gene, which normally encodes a bile salt export pump, or BSEP, protein that moves bile acids out of the liver. Specifically, we are focusing on PFIC2 patients with a non-truncating mutation of the BSEP, or nt-PFIC2, whom we estimate account for approximately 85% of the PFIC2 patient population.

Signs and symptoms of PFIC typically begin in infancy and are related to buildup of toxic bile acids in the liver. Patients with PFIC experience pruritus, jaundice, failure to gain weight and grow at the expected rate, enlarged livers and spleens and progressive liver disease. Elevation of sBA is a common feature of the disease. The most prominent and troublesome ongoing symptom of PFIC is severe pruritus, leading to a greatly diminished quality of life. Children with PFIC2, or BSEP deficiency, often develop liver failure within the first few years of life and have an increased risk of developing liver cancer. There remains a substantial unmet medical need for therapeutic options for PFIC, as partial external biliary diversion surgery, or PEBD, and liver transplantation are often the sole option available for patients. Approximately half of PFIC2 patients will need a liver transplant by the age of ten. PFIC2 children with non-truncating BSEP deficiency will be our initial target patient population for treatment with maralixibat. We believe the initial addressable patient population in the United States is approximately 500-750 children.

ALGS is a rare genetic disorder in which bile ducts are abnormally narrow, malformed and reduced in number, which leads to bile accumulation in the liver and ultimately progressive liver disease. The estimated incidence of ALGS is one in every 30,000 to 50,000 births in the United States and Europe, and we estimate that there are approximately 9,000 patients with ALGS in the United States and approximately 14,000 in Europe. We believe the initial addressable patient population in the United States will be a subset of these patients, comprising approximately 2,000-2,500 pediatric ALGS patients.

The accumulation of bile acids prevents the liver from working properly to eliminate waste from the bloodstream and leads to progressive liver disease and pruritus that ultimately leads to liver transplantation in 15% to 47% of patients. Signs and symptoms arising from cholestasis in ALGS may include jaundice, pruritus

and xanthomas, which are deposits of cholesterol under the skin. The pruritus experienced by patients with ALGS is among the most severe in any chronic liver disease and is present in most affected children by the third year of life. Intractable pruritus can be severe enough to be an indication for liver transplantation. There remains a substantial unmet medical need for therapeutic options for ALGS, as PEBD and liver transplantation are the only options available for these patients.

Our Solution

The following table depicts each of our product candidates, the respective indications we are pursuing, expected next milestones and regulatory designations:



Program	Disease	Expected Next Milestone	Regulatory Designation(s)
Maralixibat	Alagille Syndrome (ALGS)	Q3 2020: Initiate Rolling NDA submission	• Breakthrough Therapy for pruritus associated with ALGS (FDA) • Rare Pediatric Disease (FDA) • Orphan (FDA & EMA)
	Progressive Familial Intrahepatic Cholestasis (PFIC)	Q2 2020: Complete Enrollment in Phase 3	• Breakthrough Therapy for PFIC2 (FDA) • Orphan (FDA & EMA)
	Biliary Atresia (BA)	2020: Initiate Clinical Program*	• Plan to file Orphan (FDA & EMA)
Volixibat	Intrahepatic Cholestasis of Pregnancy (ICP)	2020: Initiate Phase 2	• Plan to file Orphan (FDA & EMA)
Volixibat	Primary Sclerosing Cholangitis (PSC)	2020: Initiate Phase 2	• Plan to file Orphan (FDA & EMA)

Prior to initiation, we intend to discuss the design and scope of our planned clinical program for maralixibat in BA with regulatory authorities. As we have not tested maralixibat in subjects with BA or subjects less than 12 months old, regulatory authorities may require us to conduct a Phase 2 clinical trial and/or additional clinical development activities before we are able to conduct a Phase 3 clinical trial.

Our lead product candidate, maralixibat, is a novel, oral, minimally-absorbed agent designed to selectively inhibit ASBT. Maralixibat possesses an extensive safety dataset, having been evaluated in more than 1,500 human subjects. Maralixibat has been studied in 33 pediatric patients with PFIC in the open-label Phase 2 INDIGO clinical trial. While the primary endpoint of change in sBA was not met in this study, multi-parameter responses were observed on pruritus, sBA, normalization of liver enzymes if abnormal at baseline and quality of life scores, in patients with nt-PFIC2. These data supported maralixibat’s breakthrough therapy designation for the treatment of PFIC2. A long-term analysis of the INDIGO clinical trial also showed an improvement in growth for those patients who had a response in sBA and pruritus. We commenced enrollment in the Phase 3 MARCH clinical trial of maralixibat in PFIC in the second quarter of 2019 with a primary endpoint focused on pruritus associated with PFIC2. In this Phase 3 clinical trial, we are exploring a higher dose of maralixibat (up to 600 µg/kg twice daily, or BID) compared with the INDIGO clinical trial (280 µg/kg daily, or QD). Patients have been dosed up to the equivalent of 700 µg/kg BID in previous safety trials. Although maralixibat may be eligible, as a breakthrough therapy, for priority review and accelerated approval by the FDA breakthrough therapy designation may not lead to a faster development, regulatory review or approval process, and it does not increase the likelihood that maralixibat will receive marketing approval.

Maralixibat has been studied in 86 pediatric patients with ALGS across five Phase 2 clinical trials, including three placebo-controlled clinical trials. The first two ALGS clinical trials of maralixibat, at low doses, showed signs of activity; however, their primary endpoints were not met. In the Phase 2b ICONIC clinical trial of maralixibat in ALGS, patients taking maralixibat, at a higher dose of 400 µg/kg QD, had statistically significant

reductions in pruritus and sBA compared to placebo. At the 48-week measurement, pruritus and sBA reductions were maintained and improvements in xanthomas and quality of life were also observed. A long-term analysis of the ICONIC clinical trial also showed an improvement in growth for those patients who stayed on drug and further improvements in pruritus and xanthomas.

Our second product candidate, volixibat, is a novel, oral, minimally-absorbed agent designed to selectively inhibit ASBT. We believe that volixibat may offer a novel approach in the treatment of adult cholestatic diseases by blocking recycling of bile acids, thereby reducing bile acids systemically. Phase 1 and Phase 2 clinical trials of volixibat demonstrated decreases in LDL cholesterol, increases in C4 and increases in fecal bile acid content, all markers of ASBT inhibition. We are conducting a Phase 1 dose ranging bile acid excretion study to determine dose levels for our planned efficacy studies. We plan to commence clinical trials in PSC and ICP in 2020. Previously, volixibat has been evaluated primarily for the treatment of non-alcoholic steatohepatitis, or NASH, and has not been evaluated in either PSC or ICP, and our clinical development strategy is predicated on observations of ASBT inhibition in cholestatic settings.

Our Company

Our mission is to develop life-changing therapies for patients suffering from debilitating liver diseases. Our management team has significant experience in liver and orphan diseases and progressing products from early stage research to clinical trials and ultimately to regulatory approval and commercialization. Michael Grey, our co-founder and Chairman of our board of directors, was the Chief Executive Officer of Lumena Pharmaceuticals, Inc., or Lumena, where he led the development of maralixibat and volixibat prior to Lumena’s acquisition by Shire plc in June 2014. Christopher Peetz, our President and Chief Executive Officer and co-founder, as well as several other members of our management team, previously held leadership positions at Tobira Therapeutics, Inc., a liver disease company, prior to its acquisition by Allergan plc in November 2016. As part of our strategy to acquire and advance therapeutic candidates for debilitating liver diseases, we acquired maralixibat and volixibat in November 2018 from Shire plc and are continuing to advance these product candidates for rare cholestatic liver diseases with the assistance of key program leaders from Shire plc who joined us following the acquisition.

Our Strategy

Our goal is to be a leader in the treatment of liver diseases for which the unmet medical need is high. The key components of our strategy include:

•

Advance maralixibat through clinical development and seek regulatory approvals for the treatment of PFIC, ALGS and BA;

•

Advance volixibat for the treatment of adults with PSC and ICP;

•

Commercialize our product candidates, if approved, in North America and Europe; and

•

Actively manage our product portfolio and expand our pipeline of novel product candidates.

Risks Associated with Our Business

Investing in our common stock involves substantial risk. The risks described under the heading “Risk Factors” immediately following this summary may cause us to not realize the full benefits of our strengths or may cause us to be unable to successfully execute all or part of our strategy. Some of the more significant challenges include the following:

•

We have a very limited operating history, and we have incurred significant losses since our inception and anticipate that we will continue to incur significant losses for the foreseeable future.

•

Our business is dependent on the success of our product candidates, each of which require significant clinical testing before we can seek regulatory approval and potentially launch commercial sales.

•

Our product candidates are subject to extensive regulation and compliance, which is costly and time consuming, and such regulation may cause unanticipated delays or prevent the receipt of the required approvals to commercialize our product candidates.

•

If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

•

Our clinical trials may fail to adequately demonstrate the safety and efficacy of our product candidates, which could prevent or delay regulatory approval and commercialization.

•

Clinical drug development involves a lengthy and expensive process with uncertain outcomes, and results of earlier studies and trials may not be predictive of future trial results.

•

Any delays in the commencement or completion, or termination or suspension, of our clinical trials could result in increased costs to us, delay or limit our ability to generate revenue and adversely affect our commercial prospects.

•

Even if we are able to obtain regulatory approval for any product candidate, the approved label may be limited to a symptom of the target disease, such as pruritus, or a subset of the patient population, such as patients with nt-PFIC2. Such limitations could limit our ability to generate revenue and could adversely affect our commercial prospects.

•

We face significant competition from other biotechnology and pharmaceutical companies, and our operating results will suffer if we fail to compete effectively.

•

We depend on intellectual property licensed from third parties, including the Shire License Agreement, which is defined below, and termination of any of these licenses could result in the loss of significant rights, which would harm our business.

•

We will need substantial additional financing to develop our product candidates and implement our operating plans. If we fail to obtain additional financing, we may be forced to delay, reduce or eliminate our product development programs or commercialization efforts.

•

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

Implications of Being an Emerging Growth Company and Smaller Reporting Company

We are an “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act. We may take advantage of certain exemptions from various public company reporting requirements, including not being required to have our internal control over financial reporting audited by our independent registered public accounting firm under Section 404 of the Sarbanes-Oxley Act of 2002, or the

Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and any golden parachute payments. We may take advantage of these exemptions until December 31, 2024 or until we are no longer an “emerging growth company,” whichever is earlier. We will cease to be an emerging growth company prior to the end of such period if certain earlier events occur, including if we become a “large accelerated filer” as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended, or the Exchange Act, our annual gross revenues exceed $1.07 billion or we issue more than $1.0 billion of non-convertible debt in any three-year period. In particular, in this prospectus, we have not included all of the executive compensation related information that would be required if we were not an emerging growth company. Accordingly, the information contained herein may be different than the information you receive from other public companies in which you hold stock.

In addition, the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This provision allows an emerging growth company to delay the adoption of accounting standards that have different effective dates for public and private companies until those standards would otherwise apply to private companies. We have not elected to avail ourselves of this exemption and, therefore, we will be subject to the same new or revised accounting standards as other public companies that are not “emerging growth companies.”

We are also a “smaller reporting company” as defined in the Exchange Act. We may continue to be a smaller reporting company even after we are no longer an emerging growth company. We may take advantage of certain of the scaled disclosures available to smaller reporting companies and will be able to take advantage of these scaled disclosures for so long as our voting and non-voting common stock held by non-affiliates is less than $250.0 million measured on the last business day of our second fiscal quarter, or our annual revenue is less than $100.0 million during the most recently completed fiscal year and our voting and non-voting common stock held by non-affiliates is less than $700.0 million measured on the last business day of our second fiscal quarter.

Corporate Information

We were incorporated in May 2018 as Mirum Pharmaceuticals, Inc., a Delaware corporation. Our principal executive offices are located at 950 Tower Lane, Suite 1050, Foster City, California 94404, and our telephone number is (650) 667-4085. Our website address is www.mirumpharma.com. Information contained in, or that can be accessed through, our website is not incorporated by reference into this prospectus. Our design logo, “Mirum,” and our other registered and common law trade names, trademarks and service marks are the property of Mirum Pharmaceuticals, Inc.

THE OFFERING

Common stock offered by us

2,400,000 shares

Common stock to be outstanding after this offering

25,389,987 shares

Option to purchase additional shares

We have granted the underwriters the option to purchase up to an additional 360,000 shares of our common stock. The underwriters can exercise this option at any time within 30 days after the date of this prospectus.

Use of proceeds

We estimate that our net proceeds from this offering will be approximately $51.5 million (or approximately $59.2 million if the underwriters’ option to purchase 360,000 additional shares of our common stock from us is exercised in full), after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

We intend to use the net proceeds we receive from this offering, together with our existing cash, cash equivalents and investments, to further the clinical development of maralixibat, including our Phase 3 clinical trial in PFIC, our planned NDA submission for ALGS, and our anticipated clinical program in BA; to further the clinical development of volixibat, including our planned clinical trials in ICP and PSC; and the remainder for other ongoing research and development activities, commercial preparation activities, and for general corporate purposes, including working capital, operating expenses and capital expenditures. See “Use of Proceeds” for additional information.

Nasdaq Global Market symbol

“MIRM”

Risk factors

See “Risk Factors” beginning on page 11 for a discussion of factors you should consider carefully before deciding to invest in our common stock.

The number of shares of our common stock to be outstanding after this offering set forth above is based on 22,989,987 shares of our common stock outstanding as of September 30, 2019, including 423,047 shares subject to repurchase as of such date, and excludes:

•

3,206,812 shares of our common stock issuable upon the exercise of stock options outstanding as of September 30, 2019, at a weighted-average exercise price of $4.98 per share;

•

1,272,443 shares of our common stock reserved for future issuance under our 2019 Equity Incentive Plan, or 2019 Plan, as of September 30, 2019, as well as any automatic annual increases in the number of shares of common stock reserved for issuance under our 2019 Plan and any shares underlying outstanding stock awards granted under our 2018 Equity Incentive Plan that expire or are repurchased, forfeited, cancelled or withheld, as more fully described in the section titled “Executive Compensation—Employee Benefit Plans”; and

Summary Consolidated Financial Data

The following tables set forth a summary of our historical consolidated financial data as of, and for the periods ended on, the dates indicated. The summary consolidated statement of operations data for the period from May 2, 2018 to December 31, 2018 is derived from our audited consolidated financial statements that are included elsewhere in this prospectus. The summary consolidated statement of operations data for the period from May 2, 2018 to September 30, 2018 and the nine months ended September 30, 2019, and the summary consolidated balance sheet data as of September 30, 2019, is derived from our unaudited interim consolidated financial statements and notes included elsewhere in this prospectus. We have prepared the unaudited consolidated financial statements in accordance with accounting principles generally accepted in the United States, or GAAP, and on the same basis as the audited consolidated financial statements and have included all adjustments, consisting of only normal recurring adjustments that, in our opinion, we consider necessary for a fair statement of the consolidated financial information set forth in those statements. Our historical results are not necessarily indicative of our results in any future period, and the results for the nine months ended September 30, 2019, are not necessarily indicative of results to be expected for the full year or any other period.

You should read the following summary consolidated financial data together with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and the related notes included elsewhere in this prospectus. The summary consolidated financial data in this section are not intended to replace our consolidated financial statements and the related notes and are qualified in their entirety by the consolidated financial statements and related notes included elsewhere in this prospectus.


	Period from May 2, 2018 to December 31, 2018			Period from May 2, 2018 to September 30, 2018			Nine Months Ended September 30, 2019
	(in thousands, except share and per share data)			(in thousands, except share and per share data) (unaudited)
Consolidated Statements of Operations Data:
Operating expenses:
Research and development	$	2,331		$	3		$	28,611
In process research and development		14,490			—			—
General and administrative		585			72			7,474

Total operating expenses		17,406			75			36,085

Loss from operations		(17,406	)		(75	)		(36,085	)
Other income (expense), net		58			(2	)		1,484

Net loss	$	(17,348	)	$	(77	)	$	(34,601	)

Net loss per share, basic and diluted⁽¹⁾	$	(19.29	)	$	(0.26	)	$	(4.47	)

Weighted-average shares of common stock outstanding, basic and diluted⁽²⁾		899,331			290,570			7,745,241

(1)

See Note 2 to our consolidated financial statements and related notes included elsewhere in this prospectus for a description of how we compute basic and diluted net loss per share attributable to common stockholders.

(2)

In connection with the issuance of our Series A redeemable convertible preferred stock in November 2018, certain of our founders entered into stock restriction agreements, whereby 562,500 of previously unrestricted shares of common stock became subject to repurchase by us upon the founders’ termination of employment or service, which right lapses as the shares vest. All outstanding shares

of our Series A redeemable convertible preferred stock automatically converted into 14,969,118 shares of our common stock in connection with the closing of our initial public offering in July 2019.


	As of September 30, 2019
	Actual			As Adjusted⁽¹⁾⁽²⁾
	(Unaudited) (In thousands)
Consolidated Balance Sheet Data:
Cash, cash equivalents and investments	$	153,559		$	205,015
Working capital⁽³⁾		118,408			169,864
Total assets		158,273			209,729
Accumulated deficit		(51,949	)		(51,949	)
Total stockholders’ equity		146,203			197,659

(1)

The as adjusted column reflects the receipt of the net proceeds from the sale of 2,400,000 shares of our common stock by us in this offering at the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, and after deducting the underwriting discounts and commissions and estimated offering expenses payable by us.

(2)

Each $1.00 increase or decrease in the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, would increase or decrease, respectively, the amount of cash, cash equivalents and investments, working capital, total assets and total stockholders’ equity by approximately $2.3 million, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. We may also increase or decrease the number of shares we are offering. A 1,000,000 share increase or decrease in the number of shares we are offering would increase or decrease, respectively, the amount of cash, cash equivalents and investments, working capital, total assets and stockholders’ equity by approximately $21.6 million, assuming the assumed public offering price per share, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. The as adjusted information is illustrative only, and will be adjusted based on the actual public offering price and other terms of this offering determined at pricing.

(3)

We define working capital as current assets less current liabilities. See our consolidated financial statements and related notes included elsewhere in this prospectus for further details regarding our current assets and current liabilities.

Investing in our common stock involves a high degree of risk. You should carefully consider the risks described below, as well as the other information in this prospectus, including our consolidated financial statements and the related notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” before deciding whether to invest in our common stock. The occurrence of any of the events or developments described below could harm our business, financial condition, results of operations and growth prospects. In such an event, the market price of our common stock could decline, and you may 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.

We have a very limited operating history, and we have incurred significant losses since our inception and anticipate that we will continue to incur significant losses for the foreseeable future.

We were incorporated in May 2018 and commenced operations in November 2018, and we have a very limited operating history upon which you can evaluate our business and prospects. Our operations to date have been primarily focused on acquiring and in-licensing our product candidates, maralixibat and volixibat, organizing and staffing our company, business planning, raising capital, and preparing for advancement of our product candidates into clinical development. As we build our capabilities and expand our organization, we have not yet demonstrated an ability to overcome many of the risks and uncertainties frequently encountered by companies in new and rapidly evolving fields, particularly in the biopharmaceutical area. We have not yet demonstrated an ability to obtain regulatory approval for, or to commercialize, a product candidate. In particular, because we acquired each of our product candidates from third-parties, we have not yet completed a clinical trial as a company. Consequently, any predictions about our future performance may not be as accurate as they would be if we had a history of successfully developing and commercializing biopharmaceutical products.

Investment in biopharmaceutical product development is highly speculative because it entails substantial upfront capital expenditures and significant risk that any potential product candidate will fail to demonstrate adequate effectiveness in the targeted indication or an acceptable safety profile, gain regulatory approval and become commercially viable. We have no products approved for commercial sale and have not generated any revenue to date, and we continue to incur significant research and development and other expenses related to our ongoing operations. As a result, we are not profitable and have incurred significant losses since our inception in May 2018. For the nine months ended September 30, 2019 and for the period from May 2, 2018 to September 30, 2018, we reported a net loss of $34.6 million and $0.1 million, respectively. As of September 30, 2019, we had an accumulated deficit of $51.9 million.

We expect to continue to incur significant losses for the foreseeable future, and we expect these losses to increase as we continue our clinical development of, and seek regulatory approvals for, our product candidates. We may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. The size of our future net losses will depend, in part, on the rate of future growth of our expenses and our ability to generate revenues. Our prior losses and expected future losses have had and will continue to have an adverse effect on our stockholders’ equity and working capital. Because of the numerous risks and uncertainties associated with drug development, we are unable to accurately predict the timing or amount of increased expenses, or when, if at all, we will be able to achieve profitability.

Our business is dependent on the success of our product candidates, each of which require significant clinical testing before we can seek regulatory approval and potentially launch commercial sales.

Our business and future success depends on our ability to obtain regulatory approval for, and then successfully commercialize, maralixibat, which is currently in clinical development for the treatment of PFIC and

ALGS, both of which are rare pediatric cholestatic liver diseases, and volixibat, which we are planning to develop for the treatment of adult cholestatic liver diseases. We currently generate no revenues from sales of any of our product candidates, and we may never be able to develop a marketable product. Our product candidates will require clinical development, regulatory review and approval in multiple jurisdictions, substantial investment, access to sufficient manufacturing capacity and significant marketing efforts before we can generate any revenues from product sales. Further, we are not permitted to market or promote any of our product candidates before we receive regulatory approval from the FDA or comparable foreign regulatory authorities, and we may never receive such regulatory approvals.

Our clinical trials may not be successful and may not be completed on time or at all, and the FDA or comparable foreign regulatory authorities may disagree with the design or implementation of our clinical trials. For example, in certain of our planned and ongoing clinical trials, the primary efficacy endpoint is a patient-reported outcome or a caregiver-reported outcome measuring the decrease in severity of pruritus. The FDA or comparable foreign regulatory authority may not accept such patient-reported outcomes or caregiver-reported outcomes as validated. If modifications are needed for our study design to support the submission of an application for marketing approval, incorporating such modifications may be costly and could lead to delays in obtaining approval from the FDA or comparable foreign regulatory authorities, which may significantly, adversely and materially affect our ability to successfully commercialize our product candidates. Further, even if we make changes to the study design to address these considerations, the FDA or comparable foreign regulatory authorities may not approve our product candidates.

Even if such regulatory authorities agree with the design and implementation of our clinical trials, such regulatory authorities may change their requirements in the future. In addition, even if the clinical trials are successfully completed, the FDA or foreign regulatory authorities may not interpret the results as we do, and more clinical trials could be required before we submit our product candidates for approval. For example, the FDA typically requires results from two well controlled Phase 3 clinical trials to support an NDA submission seeking approval to market a new drug. Based on interactions with the FDA, we believe that the results from a single Phase 3 clinical trial, if successful, would be sufficient to support an NDA submission seeking approval for maralixibat for the treatment of PFIC; however, the FDA may not agree to this approach. Even if we believe the results from our Phase 3 clinical trials are positive, the FDA may require us to conduct additional Phase 3 trials before we are able to submit one or more NDAs. Moreover, based on interactions with the FDA, we believe that clinical data of maralixibat in PFIC paired with adequate natural history data may be adequate to support an NDA filing for a general PFIC indication rather than the treatment of pruritus associated with PFIC; however, the FDA has not agreed to this approach but has indicated that efficacy data of the Phase 3 MARCH-PFIC clinical trial, if positive, may be adequate to support an NDA submission for the treatment of pruritus associated with nt-PFIC2. If we are unable to obtain adequate natural history data or the FDA does not view such data as sufficient to support approval for a general PFIC indication, the NDA submission for maralixibat may be limited to the treatment of pruritus associated with nt-PFIC2.

In May 2019, we had an end-of-Phase 2 meeting with the FDA to discuss the adequacy of the current data set of maralixibat to support an NDA submission for the treatment of pruritus associated with ALGS. At the request of the FDA, we prepared various analyses of the maralixibat data set, in particular the ICONIC clinical trial as the potential pivotal study, and requested an additional meeting with the FDA. In October 2019, the FDA requested that we convert the meeting to a pre-NDA meeting and discuss the components and timeline of an NDA submission. During this meeting, we and the FDA reached consensus on a timeline for initiating a rolling submission of an NDA in the third quarter of 2020 and the details of various routine datasets to generate for the submission. We expect the NDA submission to be complete in the first quarter of 2021, which will include the submission of the FDA requested CMC data, including requested stability data. These projected timings are dependent on successful completion of various clinical activities, availability and analysis of clinical data and completion of validation batches by manufacturers, as well as generating acceptable stability data. In addition, an NDA must be supported by extensive clinical and preclinical data, as well as extensive information regarding pharmacology and CMC. The FDA may disagree with our interpretation of such data and information, which may require us to, among other things, complete additional CMC development. As a result, FDA approval

of maralixibat for pruritus associated with ALGS may be delayed and we may be required to expend significant additional resources seeking such approval. Moreover, although we are in the process of discussing our planned ALGS registrational program with the European Medicines Agency, or EMA, we have not reached agreement, and the EMA may not accept our currently proposed ALGS registrational program.

To the extent that the results of our clinical trials are not satisfactory to the FDA or foreign regulatory authorities for support of a marketing application, approval for our product candidates may be significantly delayed or prevented, or we may be required to expend significant additional resources, which may not be available to us, to conduct additional clinical trials in support of potential approval for our product candidates. Even if we are able to obtain approval for any product candidate, the approved label may be limited to a symptom of the target disease, such as pruritus, or subset of the patient population, such as patients with nt-PFIC2.

If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

Patient enrollment, a significant factor in the timing of clinical trials, is affected by many factors including the size and nature of the patient population, the proximity of patients to clinical sites, the eligibility criteria for the clinical trial, the design of the clinical trial, competing clinical trials and clinicians’ and patients’ perceptions as to the potential advantages of the product candidate being studied in relation to other available therapies, including any new drugs that may be approved for the indications we are investigating.

For example, each indication for which we are evaluating maralixibat and volixibat is a rare cholestatic liver disease with limited patient populations from which to draw participants in clinical trials. We will be required to identify and enroll a sufficient number of patients with the disease under investigation for each of our ongoing and planned clinical trials of maralixibat and volixibat. Potential patients may not be adequately diagnosed or identified with the diseases which we are targeting or may not meet the entry criteria for our studies. For example, many patients with PFIC seek liver transplants early and as a result become ineligible for our treatment. In addition, for example, in PFIC, we intend to conduct clinical trials in countries that have not yet had maralixibat trials conducted and we have not yet worked with such foreign regulatory authorities. As a result, we could face patient recruitment issues in certain countries where such foreign regulatory authorities are not familiar with maralixibat. Additionally, other pharmaceutical companies targeting these same cholestatic liver diseases are recruiting clinical trial patients from these patient populations, which may delay or make it more difficult to fully enroll our clinical trials. Our inability to enroll a sufficient number of patients for any of our current or future clinical trials would result in significant delays or may require us to abandon one or more clinical trials altogether.

We believe we have appropriately accounted for the above factors in our trials when determining expected clinical trial timelines, but our assumptions may not be correct and we may experience delays in enrollment, which would result in the delay of completion of such trials beyond our expected timelines.

Our clinical trials may fail to adequately demonstrate the safety and efficacy of our product candidates, which could prevent or delay regulatory approval and commercialization.

Before obtaining regulatory approvals for the commercial sale of a product candidate, we must demonstrate through lengthy, complex and expensive preclinical testing and clinical trials that a product candidate is both safe and effective for use in each target indication. Clinical trials often fail to demonstrate safety and efficacy of the product candidate studied for the target indication. Most product candidates that commence clinical trials are never approved by regulatory authorities for commercialization. In the case of maralixibat and volixibat, we are seeking to develop treatments for rare cholestatic liver diseases for which there is limited clinical experience, and our planned clinical trials use novel end points and measurement methodologies, which add complexity to the conduct of and analysis of data from our clinical trials and may delay or prevent regulatory approval. Importantly, because the measure of pruritus relies on subjective patient feedback, it is inherently difficult to

evaluate, and is subject to placebo effect. It can be influenced by factors outside of our control and can vary widely from day to day for a particular patient, and from patient to patient and site to site within a clinical trial. The placebo effect may also have a significant impact on pruritus trials.

Clinical drug development involves a lengthy and expensive process with uncertain outcomes, and results of earlier studies and trials may not be predictive of future trial results.

Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure can occur at any time during the clinical trial process. The results of preclinical studies and early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy traits despite having progressed through preclinical studies and initial clinical trials. For example, volixibat has been evaluated primarily for the treatment of non-alcoholic steatohepatitis and has not been evaluated in PSC or ICP, and our clinical development strategy is predicated on observations of ASBT inhibition in cholestatic settings. Similarly, maralixibat has not yet been evaluated in BA or in subjects under 12 months of age. As such, our hypothesis of efficacy in these diseases will be evaluated in these target patient populations and may not show the desired clinical results. A number of companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of efficacy or safety profiles, notwithstanding promising results in earlier trials. Moreover, preclinical and clinical data are often susceptible to varying interpretations and analyses. For example, in the Phase 2 INDIGO clinical trial evaluating maralixibat in PFIC patients, the primary efficacy analysis of sBA change from baseline to week 13 did not reach statistical significance for the overall group; however, a 48-week analysis of the clinical trial demonstrated a profound treatment response in a subset of patients with nt-PFIC2. In addition, we do not have experience in conducting placebo-controlled studies for PFIC, and we expect to administer higher doses of maralixibat than we previously have administered in this setting. We may face significant setbacks as we initiate and conduct our placebo-controlled Phase 3 clinical trial in PFIC, which may delay or prevent regulatory approval of maralixibat.

Our planned clinical trials may not be successful, and any safety concerns observed in any one of our clinical trials in our targeted indications could limit the prospects for regulatory approval of our product candidates in other indications.

Before we can initiate clinical trials for our product candidates, we must submit the results of preclinical studies to the FDA or comparable foreign regulatory authorities along with other information, including information about product candidate CMC and our proposed clinical trial protocol, as part of an investigational new drug, or IND, application or similar regulatory filing. Before obtaining marketing approval from regulatory authorities for the sale of our product candidates, we must conduct extensive clinical studies to demonstrate the safety and efficacy of the product candidates in humans. Clinical testing is expensive, time consuming and uncertain as to outcome. In addition, we may rely in part on preclinical, clinical and quality data generated by clinical research organizations, or CROs, and other third parties for regulatory submissions for our product candidates. While we have or will have agreements governing these third parties’ services, we have limited influence over their actual performance. If these third parties do not make data available to us, or, if applicable, do not make regulatory submissions in a timely manner, in each case pursuant to our agreements with them, our development programs may be significantly delayed, and we may need to conduct additional studies or collect additional data independently. In either case, our development costs would increase.

We do not know whether our planned clinical trials will begin on time or be completed on schedule, if at all. The commencement and completion of clinical trials can be delayed for a number of reasons, including delays related to:

In addition, we plan to advance maralixibat for the treatment of BA and initiate a clinical program in 2020. Prior to initiation, we intend to discuss the design and scope of our planned clinical program for maralixibat in BA with regulatory authorities. As we have not tested maralixibat in subjects with BA or subjects less than 12 months old, regulatory authorities may require us to conduct a Phase 2 clinical trial and/or additional clinical development activities before we are able to conduct a Phase 3 clinical trial.

We could also encounter delays if a clinical trial is suspended or terminated by us, by the IRBs of the institutions in which such trials are being conducted, by a Data Safety Monitoring Board for such trial or by the FDA or comparable foreign regulatory authorities. Such authorities may impose such a suspension or termination due to a number of factors, including failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the FDA or comparable foreign regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from using a drug, changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical trial. In addition, changes in regulatory requirements and policies may occur, and we may need to amend clinical trial protocols to comply with these changes. Amendments may require us to resubmit our clinical trial protocols to IRBs for reexamination, which may impact the costs, timing or successful completion of a clinical trial.

Further, conducting clinical trials in foreign countries, as we may do for our product candidates, presents additional risks that may delay completion of our clinical trials. These risks include the failure of enrolled patients in foreign countries to adhere to clinical protocol as a result of differences in healthcare services or cultural customs, managing additional administrative burdens associated with foreign regulatory schemes, as well as political and economic risks relevant to such foreign countries.

Moreover, principal investigators for our clinical trials may serve as scientific advisors or consultants to us from time to time and receive compensation in connection with such services. Under certain circumstances, we may be required to report some of these relationships to the FDA or comparable foreign regulatory authorities. The FDA or comparable foreign regulatory authority may conclude that a financial relationship between us and a principal investigator has created a conflict of interest or otherwise affected interpretation of the study. The FDA or comparable foreign regulatory authority may therefore question the integrity of the data generated at the applicable clinical trial site and the utility of the clinical trial itself may be jeopardized. This could result in a delay in approval, or rejection, of our marketing applications by the FDA or comparable foreign regulatory authority, as the case may be, and may ultimately lead to the denial of marketing approval of one or more of our product candidates.

If we experience delays in the completion of, or termination of, any clinical trial of our product candidates, the commercial prospects of our product candidates will be harmed, and our ability to generate product revenues from any of these product candidates will be delayed. Moreover, any delays in completing our clinical trials will increase our costs, slow down our product candidate development and approval process and jeopardize our ability to commence product sales and generate revenues. In addition, many of the factors that cause, or lead to, termination or suspension of, or a delay in the commencement or completion of, clinical trials may also ultimately lead to the denial of regulatory approval of a product candidate. Any delays to our clinical trials that occur as a result could shorten any period during which we may have the exclusive right to commercialize our product candidates and our competitors may be able to bring products to market before we do, and the commercial viability of our product candidates could be significantly reduced. Any of these occurrences may harm our business, financial condition and prospects significantly.

The clinical development, manufacturing, labeling, storage, record-keeping, advertising, promotion, import, export, marketing and distribution of our product candidates are subject to extensive regulation by the FDA in the United States and by comparable foreign regulatory authorities in foreign markets. In the United States, we are not permitted to market our product candidates until we receive regulatory approval from the FDA. The process of obtaining regulatory approval is expensive, often takes many years following the commencement of clinical trials and can vary substantially based upon the type, complexity and novelty of the product candidates involved, as well as the target indications and patient population. Approval policies or regulations may change, and the FDA has substantial discretion in the drug approval process, including the ability to delay, limit or deny approval of a product candidate for many reasons. Despite the time and expense invested in clinical development of product candidates, regulatory approval is never guaranteed. Neither we nor any future collaborator is permitted to market any of our product candidates in the United States until we receive approval of an NDA from the FDA. We have not previously submitted an NDA to the FDA, or similar drug approval filings to comparable foreign authorities.

Prior to obtaining approval to commercialize a product candidate in the United States or internationally, we must demonstrate with substantial evidence from adequate and well-controlled clinical trials, and to the satisfaction of the FDA or comparable foreign regulatory authorities, that such product candidates are safe and effective for their intended uses. Results from nonclinical studies and clinical trials can be interpreted in different ways. Even if we believe the nonclinical or clinical data for our product candidates are promising, such data may not be sufficient to support approval by the FDA and comparable foreign regulatory authorities. The FDA or comparable foreign regulatory authorities, as the case may be, may also require us to conduct additional preclinical studies or clinical trials for our product candidates either prior to or post-approval, or may object to elements of our clinical development program.

Our product candidates could fail to receive regulatory approval for many reasons, including the following:

Any of the above events could prevent us from achieving market approval of our product candidates and could substantially increase the costs of commercializing our product candidates. The demand for our product candidates could also be negatively impacted by any adverse effects of a competitor’s product or treatment.

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

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

If the market opportunities for our product candidates are smaller than we believe they are, our future revenue may be adversely affected, and our business may suffer.

If the size of the market opportunities in each of our target indications is smaller than we anticipate, we may not be able to achieve profitability and growth. We focus our clinical development of maralixibat on treatments for rare pediatric cholestatic liver diseases with relatively small patient populations. Given the small number of patients who have the diseases that we are targeting with maralixibat, it is critical to our ability to grow and become profitable that we continue to successfully identify patients with these rare pediatric cholestatic liver diseases. We also plan to focus our clinical development of volixibat as a treatment for PSC or ICP with a relatively small patient population. In addition, our estimates of the patient populations for our target indications have been derived from a variety of sources, including the scientific literature, surveys of clinics, patient foundations, and market research, and may prove to be incorrect. Further, new studies may change the estimated incidence or prevalence of these diseases. The number of patients may turn out to be lower than expected. For example, while we are evaluating maralixibat in patients with different types of PFIC in our Phase 3 MARCH-PFIC clinical trial, in prior studies of maralixibat, the Phase 2 INDIGO clinical trial in particular, all of the multi-parameter responders were in the nt-PFIC2 subpopulation. Further, the primary endpoint in our Phase 3 MARCH-PFIC clinical trial is designed to evaluate maralixibat’s effect on pruritus associated with nt-PFIC2. As such, even if our Phase 3 MARCH-PFIC clinical trial shows positive results in other PFIC subgroups, the design of our clinical trial may limit the ability of our NDA to be approved beyond the nt-PFIC2 population, if at all. The effort to identify patients with diseases we seek to treat is in early stages, and we cannot accurately predict the number of patients for whom treatment might be possible. Additionally, the potentially addressable patient population for each of our product candidates may be limited or may not be amenable to treatment with our product candidates, and new patients may become increasingly difficult to identify or gain access to, which would adversely affect our results of operations and our business. Further, even if we obtain significant market share for our product candidates, because the potential target populations are very small, we may never achieve

profitability despite obtaining such significant market share. Lastly, the potentially addressable patient population for PFIC and ALGS may even be further reduced as gene therapy products become more widely accepted and approved.

Obtaining and maintaining regulatory approval for a product candidate in one jurisdiction does not mean that we will be successful in obtaining regulatory approval for that product candidate in other jurisdictions.

Obtaining and maintaining regulatory approval for a product candidate in one jurisdiction does not guarantee that we will be able to obtain or maintain regulatory approval in any other jurisdiction, while a failure or delay in obtaining regulatory approval in one jurisdiction may have a negative effect on the regulatory approval process in others. For example, even if the FDA grants marketing approval for a product candidate, comparable regulatory authorities in foreign jurisdictions must also approve the manufacturing, marketing and promotion of the product candidate in those countries. Approval procedures vary among jurisdictions and can involve requirements and administrative review periods different from, and greater than, those in the United States, including additional preclinical studies or clinical trials as clinical trials conducted in one jurisdiction may not be accepted by regulatory authorities in other jurisdictions. In many jurisdictions outside the United States, a product candidate must be approved for reimbursement before it can be approved for sale in that jurisdiction. In some cases, the price that we intend to charge for our product candidates is also subject to approval.

We expect to submit a Marketing Authorization Application, or MAA, to the EMA for approval for maralixibat and volixibat in the European Union. As with the FDA, obtaining approval of an MAA from the EMA is a similarly lengthy and expensive process and the EMA has its own procedures for approval for product candidates. Regulatory authorities in jurisdictions outside of the United States and the European Union also have requirements for approval for product candidates with which we must comply prior to marketing in those jurisdictions. Obtaining foreign regulatory approvals and compliance with foreign regulatory requirements could result in significant delays, difficulties and costs for us and could delay or prevent the introduction of our product candidates in certain countries. If we fail to comply with the regulatory requirements in international markets and/or receive applicable marketing approvals, our target market will be reduced and our ability to realize the full market potential of any of our product candidates will be harmed, which would adversely affect our business, prospects, financial condition and results of operations.

Our product candidates may cause undesirable side effects or have other properties that could delay or prevent their regulatory approval or result in significant negative consequences following marketing approval, if any.

As is the case with biopharmaceuticals generally, it is likely that there may be side effects and adverse events associated with our product candidates’ use. Results of our clinical trials could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics. Undesirable side effects caused by our product candidates could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA or other comparable foreign authorities. For example, we have observed increases in alanine aminotransferase, or ALT, levels in certain patients being treated with maralixibat with ALGS. In addition, we intend to use higher doses of maralixibat and volixibat in future clinical trials. The use of higher doses could result in more frequent or more severe side effects. Furthermore, only patients 12 months of age and older have been treated with maralixibat, and the safety profile in patients under 12 months of age is unknown and may be different than that observed in previous clinical trials. Results of our trials could reveal a high and unacceptable severity and prevalence of these or other side effects.

In prior clinical studies of maralixibat, the most commonly reported adverse events, or AEs, and SAEs have been those of gastrointestinal, or GI, disorders such as diarrhea, abdominal pain and vomiting, and were mostly mild to moderate in severity and transient in nature. Reported treatment-related SAEs have consisted of abdominal pain, upper abdominal pain, diarrhea, cholangitis, increase in blood bilirubin, increase in international

normalized ratio, increase in pancreatitis, elevated ALT, autoimmune hepatitis, hematochezia, pure red cell aplasia, myelodysplastic syndrome and anemia. The frequency of observed AEs and SAEs has not increased over time. In Phase 1 clinical trials of volixibat, the most common AEs reported were mild to moderate GI events observed in the volixibat groups. The only treatment-related SAE reported was one event of elevated ALT.

In such an event, our trials could be suspended or terminated and the FDA or comparable foreign regulatory authorities could order us to cease further development of or deny approval for our product candidates for any or all targeted indications. The drug-related side effects could affect patient recruitment or the ability of enrolled patients to complete the trial or result in potential product liability claims. Any of these occurrences may harm our business, financial condition and prospects significantly.

Additionally, if one or more of our product candidates receives marketing approval, and we or others later identify undesirable side effects caused by such product candidates, a number of potentially significant negative consequences could result, including:

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

If we receive regulatory approval for a product candidate, we will be subject to ongoing regulatory obligations and continued regulatory review, which may result in significant additional expense and we may be subject to penalties if we fail to comply with regulatory requirements or experience unanticipated problems with any product.

Any regulatory approvals that we receive may be subject to limitations on the approved indicated uses for which the product may be marketed or to the conditions of approval, or contain requirements for potentially costly post-marketing testing, including post-market studies or clinical trials, and surveillance to monitor safety and effectiveness. The FDA may also require a REMS in order to approve a product candidate, which could entail requirements for a medication guide, physician communication plans or additional elements to ensure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. In addition, if the FDA or a comparable foreign regulatory authority approves a product candidate, the manufacturing processes, labeling, packaging, distribution, adverse event reporting, storage, advertising, promotion, import, export and recordkeeping for the approved product will be subject to extensive and ongoing regulatory requirements. For example, the FDA strictly regulates the promotional claims that may be made about drug products. In particular, a product may not be promoted for uses that are not approved by the FDA as reflected in the product’s approved labeling. The FDA also requires submissions of safety and other post-marketing information and reports, registration, as well as continued compliance with cGMP requirements and GCP for any clinical trials that we conduct post-approval. Later discovery of previously unknown problems with a product candidate, including adverse events of unanticipated severity or frequency, or with our third-party manufacturers or manufacturing processes, or failure to comply with regulatory requirements, may result in, among other things:

The occurrence of any event or penalty described above may inhibit our ability to commercialize our product candidates and generate revenue and could require us to expend significant time and resources in response and could generate negative publicity.

The FDA’s and other regulatory authorities’ policies may change and additional government regulations may be enacted that could prevent, limit or delay regulatory approval for our product candidates. 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, which would adversely affect our business, prospects, financial condition and results of operations.

We may pursue approval in the United States or Europe using accelerated approval or conditional approval pathways, which typically require commitments to complete additional clinical trials. The additional clinical trials may not confirm the treatment effect, which may result in the loss of marketing authorization under accelerated approval or conditional approval.

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

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

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

Even if we obtain regulatory approval for our product candidates, our product candidates may not gain market acceptance among physicians, patients, tertiary care centers, transplant centers and others in the medical community.

If any one of our product candidates is approved for commercialization, its acceptance will depend on a number of factors, including:

If any of our product candidates are approved but fail to achieve market acceptance among physicians, patients or others in the medical community, we will not be able to generate significant revenues, which would have a material adverse effect on our business, prospects, financial condition and results of operations. In addition, even if any of our product candidates gain acceptance, the markets for the treatment of patients with our target indications for maralixibat may not be as significant as we estimate.

If our product candidates are approved for marketing, and we are found to have improperly promoted off-label uses, or if physicians prescribe our products or use our products off-label, we may become subject to prohibitions on the sale or marketing of our products, significant fines, penalties, sanctions, or product liability claims, and our image and reputation within the industry and marketplace could be harmed.

The FDA and comparable foreign authorities strictly regulate the marketing and promotional claims that are made about pharmaceutical products, such as our product candidates, if approved. In particular, a product may not be promoted for uses or indications that are not approved by the FDA or comparable foreign authorities as reflected in the product’s approved labeling. If we receive marketing approval for maralixibat, physicians could prescribe maralixibat to their patients in a manner that is inconsistent with the approved label. If we are found to have promoted such off-label uses, we may receive warning letters from the FDA and comparable foreign authorities and become subject to significant liability, which would materially harm our business. The federal government has levied large civil and criminal fines against companies for alleged improper promotion and has enjoined several companies from engaging in off-label promotion. If we become the target of such an investigation or prosecution based on our marketing and promotional practices, we could face similar sanctions, which would materially harm our business. In addition, management’s attention could be diverted from our business operations, significant legal expenses could be incurred, and our reputation could be damaged. The FDA has also required that companies enter into consent decrees or permanent injunctions under which specified promotional conduct is changed or curtailed in order to resolve FDA enforcement actions. If we are deemed by the FDA to have engaged in the promotion of our products for off-label use, we could be subject to FDA prohibitions or other restrictions on the sale or marketing of our products and other operations or significant fines and penalties, and the imposition of these sanctions could also affect our reputation and position within the industry.

Coverage and reimbursement may be limited or unavailable in certain market segments for our product candidates which could make it difficult for us to sell our product candidates profitably.

Successful sales of our product candidates, if approved, depend on the availability of coverage and adequate reimbursement from third-party payors. Patients who are prescribed medicine for the treatment of their

conditions generally rely on third-party payors to reimburse all or part of the costs associated with their prescription drugs. Coverage and adequate reimbursement from governmental healthcare programs, such as Medicare and Medicaid, and commercial payors is critical to new product acceptance, and we may not obtain such coverage or adequate reimbursement.

Government authorities and third-party payors, such as private health insurers and health maintenance organizations, decide which drugs they will cover and the amount of reimbursement they will provide. Reimbursement by a third-party payor may depend upon a number of factors, including, but not limited to, the third-party payor’s determination that use of a product is:

Obtaining coverage and reimbursement approval for a product from a government or other third-party payor is a time-consuming and costly process that could require us to provide to the payor supporting scientific, clinical and cost-effectiveness data for the use of our products. We may not be able to provide data sufficient to obtain coverage and adequate reimbursement. Assuming we obtain coverage for a given product, the resulting reimbursement payment rates might not be adequate or may require co-payments that patients find unacceptably high. Patients are unlikely to use our product candidates unless coverage is provided and reimbursement is adequate to cover a significant portion of the cost of our product candidates. Additionally, the reimbursement rates and coverage amounts may be affected by the approved label for our product candidates, including, in particular, whether the approved label is limited to the treatment of symptoms, such as pruritus, as compared to the treatment of the underlying disease. If coverage and reimbursement of our future products are unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, we may be unable to achieve or sustain profitability.

In addition, the market for our products 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 industry competition to be included in such formularies often leads to downward pricing pressures on pharmaceutical companies. Also, third-party payors may refuse to include a particular branded drug in their formularies or otherwise restrict patient access through formulary controls or otherwise to a branded drug when a less costly generic equivalent or other alternative is available.

In the United States, no uniform policy of coverage and reimbursement for drug products exists among third-party payors. Third-party payors often rely upon Medicare coverage policy and payment limitations in setting their own reimbursement rates, but also have their own methods and approval process apart from Medicare determinations. Therefore, coverage and reimbursement for drug products can differ significantly from payor to payor. As a result, the coverage determination process is often a time-consuming and costly process that will require us to provide scientific and clinical support for the use of our product candidates to each payor separately, with no assurance that coverage and adequate reimbursement will be obtained.

We intend to seek approval to market our product candidates in both the United States and in selected foreign jurisdictions. If we obtain approval in one or more foreign jurisdictions for a product candidate, we will be subject to rules and regulations in those jurisdictions. In some foreign countries, particularly those in the European Union, the pricing of prescription pharmaceuticals and biologics is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after obtaining marketing approval for a drug candidate. In addition, market acceptance and sales of a product will depend significantly on the availability of coverage and adequate reimbursement from third-party payors for a product and may be affected by existing and future health care reform measures.

Recently enacted legislation, future legislation and healthcare reform measures may increase the difficulty and cost for us to obtain marketing approval for and commercialize our product candidates and may affect the prices we may set.

In the United States and some foreign jurisdictions, there have been, and we expect there will continue to be, a number of legislative and regulatory changes to the healthcare system, including cost-containment measures that may reduce or limit coverage and reimbursement for newly approved drugs and affect our ability to profitably sell any product candidates for which we obtain marketing approval. In particular, there have been and continue to be a number of initiatives at the U.S. federal and state levels that seek to reduce healthcare costs and improve the quality of healthcare.

For example, in March 2010, the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act, or collectively, the Affordable Care Act, was enacted in the United States. Among the provisions of the Affordable Care Act of importance to our potential product candidates, the Affordable Care Act: established an annual, nondeductible fee on any entity that manufactures or imports specified branded prescription drugs and biologic agents; expands eligibility criteria for Medicaid programs; increased the statutory minimum rebates a manufacturer must pay under the Medicaid Drug Rebate Program; creates a new Medicare Part D coverage gap discount program; established a new Patient-Centered Outcomes Research Institute to oversee, identify priorities in and conduct comparative clinical effectiveness research, along with funding for such research; and established a Center for Medicare & Medicaid Innovation at the Centers for Medicare & Medicaid Services, or CMS, to test innovative payment and service delivery models to lower Medicare and Medicaid spending. At this time, we are unsure of the full impact that Affordable Care Act will have on our business. There have been judicial and Congressional challenges to certain aspects of the Affordable Care Act, as well as recent efforts by the Trump administration to repeal or replace certain aspects of the Affordable Care Act and we expect such challenges and amendments to continue. The Tax Cuts and Jobs Act of 2017, or the Tax Act, was signed into law, which included a provision which repealed, effective January 1, 2019, the tax-based shared responsibility payment imposed by the Affordable Care Act on certain individuals who fail to maintain qualifying health coverage for all or part of a year that is commonly referred to as the “individual mandate.” On December 14, 2018, a Texas U.S. District Court Judge ruled that the Affordable Care Act is unconstitutional in its entirety because the “individual mandate” was repealed by Congress as part of the Tax Act. Additionally, on December 18, 2019, the U.S. Court of Appeals for the 5^th Circuit ruled that that the individual mandate was unconstitutional and remanded the case back to the District Court to determine whether the remaining provisions of the Affordable Care Act are invalid as well. It is unclear how these decisions, future decisions, subsequent appeals, and other efforts to repeal and replace the Affordable Care Act will impact the Affordable Care Act and our business.

In addition, other legislative changes have been proposed and adopted since the Affordable Care Act was enacted. On August 2, 2011, the Budget Control Act of 2011 was signed into law, which, among other things, included reductions to Medicare payments to providers of 2% per fiscal year, which went into effect on April 1, 2013 and, due to subsequent legislative amendments to the statute, including the Bipartisan Budget Act of 2018, will remain in effect through 2029 unless additional Congressional action is taken. On January 2, 2013, the American Taxpayer Relief Act of 2012 was signed into law, which, among other things, reduced Medicare payments to several providers, including hospitals, and increased the statute of limitations period for the government to recover overpayments to providers from three to five years.

Further, there has been heightened governmental scrutiny in the United States of pharmaceutical pricing practices in light of the rising cost of prescription drugs. Such scrutiny has resulted in several recent 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 products.

At the federal level, the Trump administration’s budget proposal for fiscal year 2020 contained further drug price control measures that could be enacted during the budget process or in other future legislation, including,

for example, measures to permit Medicare Part D plans to negotiate the price of certain drugs under Medicare Part B, to allow some states to negotiate drug prices under Medicaid and to eliminate cost sharing for generic drugs for low-income patients. Additionally, on May 11, 2018, President Trump laid out his administration’s “Blueprint” to lower drug prices and reduce out of pocket costs of drugs that contains additional proposals to increase drug manufacturer competition, increase the negotiating power of certain federal healthcare programs, incentivize manufacturers to lower the list price of their products, and reduce the out of pocket costs of drug products paid by consumers. The U.S. Department of Health and Human Services has solicited feedback on some of these measures and, at the same time, has implemented others under its existing authority. For example, in May 2019, CMS issued a final rule to allow Medicare Advantage Plans the option of using step therapy for Part B drugs beginning January 1, 2020. This final rule codified CMS’s policy change that was effective January 1, 2019. Although some of these and other proposals may require additional authorization to become effective, Congress and the Trump administration have each indicated that it will continue to seek new legislative and/or administrative measures to control drug costs.

At the state level, individual states in the United States have also increasingly passed legislation and implemented 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. Legally mandated price controls on payment amounts by third-party payors or other restrictions could harm our business, results of operations, financial condition and prospects. In addition, regional healthcare authorities and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription drug and other healthcare programs. This could reduce the ultimate demand for our product candidates, if approved, or put pressure on our product pricing, which could negatively affect our business, results of operations, financial condition and prospects.

Moreover, on May 30, 2018, the Trickett Wendler, Frank Mongiello, Jordan McLinn, and Matthew Bellina Right to Try Act of 2017, or Right to Try Act, was signed into law. The law, among other things, provides a federal framework for patients to access certain investigational new drug products that have completed a Phase I clinical trial. Under certain circumstances, eligible patients can seek treatment without enrolling in clinical trials and without obtaining FDA approval under the FDA expanded access program. There is no obligation for a drug manufacturer to make its drug products available to eligible patients as a result of the Right to Try Act.

We expect that the Affordable Care Act, these new laws and other healthcare reform measures that may be adopted in the future may result in additional reductions in Medicare and other healthcare funding, more rigorous coverage criteria, new payment methodologies and additional downward pressure on the price that we receive for any approved product. Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from third-party payors. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability or commercialize our product candidates, if approved.

We currently have no marketing and sales organization and have no experience in marketing products. If we are unable to establish marketing and sales capabilities or enter into agreements with third parties to market and sell our product candidates, we may not be able to generate product revenues.

We currently do not have a commercial organization for the marketing, sales and distribution of pharmaceutical products. To commercialize our product candidates we must build our marketing, sales, distribution, managerial and other non-technical capabilities or make arrangements with third parties to perform these services. We expect that the majority of all PFIC and ALGS patients will be treated at tertiary care centers and transplant centers and therefore can be addressed with a targeted sales force. We intend to build our own commercial infrastructure in North America and in major European markets to target these centers, but will evaluate opportunities to partner with pharmaceutical companies that have established sales and marketing capabilities to commercialize our product candidates, if approved, outside of these geographies.

The establishment and development of our own sales force or the establishment of a contract sales force to market our product candidates will be expensive and time-consuming and could delay any commercial launch. Moreover, we may not be able to successfully develop this capability. We will have to compete with other pharmaceutical and biotechnology companies to recruit, hire, train and retain marketing and sales personnel. We also face competition in our search for third parties to assist us with the sales and marketing efforts of our product candidates. To the extent we rely on third parties to commercialize our product candidates, if approved, we may have little or no control over the marketing and sales efforts of such third parties and our revenues from product sales may be lower than if we had commercialized our product candidates ourselves. In the event we are unable to develop our own marketing and sales force or collaborate with a third-party marketing and sales organization, we would not be able to commercialize our product candidates.

A variety of risks associated with marketing our product candidates internationally could materially adversely affect our business.

We plan to seek regulatory approval for our product candidates internationally and, accordingly, we expect that we will be subject to additional risks related to operating in foreign countries if we obtain the necessary approvals, including:

In addition, some countries, such as Brazil, require that clinical trial participants receive the product at no cost even after the clinical trial has ended. We would not be able to recover any profit for these patients and depending on the number of patients, duration of the treatment and numerous other factors, such regulations could harm our business, prospects, financial condition and results of operations significantly. These and other risks associated with our international operations may materially adversely affect our ability to attain or maintain profitable operations.

If we fail to develop and commercialize additional product candidates, we may be unable to grow our business.

Although we currently have no specific plans to do so, we may seek to develop and commercialize product candidates in addition to maralixibat and volixibat. If we decide to pursue the development and commercialization of any additional product candidates, we may be required to invest significant resources to acquire or in-license the rights to such product candidates or to conduct drug discovery activities. We do not currently have the necessary drug discovery personnel or expertise adequate to discover and develop an additional product candidate on our own. Any other product candidates will require additional, time-consuming development efforts, and significant financial resources, prior to commercial sale, including preclinical studies, extensive clinical trials and approval by the FDA and applicable foreign regulatory authorities. All product candidates are prone to the risks of failure that are inherent in pharmaceutical product development, including the possibility that the product candidate will not be shown to be sufficiently safe and/or effective for approval by regulatory authorities. In addition, we may not be able to acquire, discover or develop any additional product candidates, and any additional product candidates we may develop may not be approved, manufactured or produced economically, successfully commercialized or widely accepted in the marketplace or be more effective than other commercially available alternatives. Research programs to identify new product candidates require substantial technical, financial and human resources whether or not we ultimately identify any candidates. If we are unable to develop or commercialize any other product candidates, our business and prospects will suffer.

If we fail to develop maralixibat and potentially other of our product candidates for additional indications, our commercial opportunity will be limited.

One of our strategies is to pursue clinical development of maralixibat in additional cholestatic disease conditions such as BA, post-liver transplant cholestasis, benign recurrent intrahepatic cholestasis and drug-induced cholestasis. In addition, we plan to develop volixibat for the treatment of PSC and ICP.

The pediatric cholestatic liver diseases we are targeting are all rare diseases and, as a result, the market size for the treatment of patients with ALGS and PFIC is limited. Due to these factors, our ability to grow revenues may be dependent on our ability to successfully develop and commercialize maralixibat for the treatment of additional indications. Developing, obtaining regulatory approval and commercializing maralixibat for additional indications will require substantial additional funding beyond the net proceeds of this offering and is prone to the risks of failure inherent in drug development. We may not be able to successfully advance any of these indications through the development process. Even if we receive regulatory approval to market maralixibat for the treatment of any of these additional indications, any such additional indications may not be successfully commercialized, widely accepted in the marketplace or more effective than other commercially available alternatives. If we are unable to successfully develop and commercialize maralixibat for these additional indications, our commercial opportunity will be limited.

We face significant competition from other biotechnology and pharmaceutical companies, and our operating results will suffer if we fail to compete effectively.

The biopharmaceutical industry is characterized by intense competition and rapid innovation. Although we believe that we hold a leading position in our focus on rare pediatric cholestatic liver diseases, our competitors may be able to develop other compounds or drugs that are able to achieve similar or better results. Our potential competitors include major multinational pharmaceutical companies, established biotechnology companies, specialty pharmaceutical companies and universities and other research institutions. Many of our competitors have substantially greater financial, technical and other resources, such as larger research and development staff and experienced marketing and manufacturing organizations and well-established sales forces. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large, established companies. Mergers and acquisitions in the biotechnology and pharmaceutical industries may result in even more resources being concentrated in our competitors. Competition may increase further as a

result of advances in the commercial applicability of technologies and greater availability of capital for investment in these industries. Our competitors may succeed in developing, acquiring or licensing on an exclusive basis drug products that are more effective or less costly than our product candidates. We believe the key competitive factors that will affect the development and commercial success of our product candidates are efficacy, safety and tolerability profile, reliability, convenience of dosing, price and reimbursement.

Outside of surgery, there are no approved therapies for the treatment of ALGS or PFIC in the United States. Ursodeoxycholic acid (ursodiol), or UDCA, which is approved for the treatment of primary biliary cholangitis, or PBC, another type of cholestatic liver disease, is sometimes used to treat patients with other cholestatic liver diseases. Cholestyramine and other bile salt resins, rifampin, and naltrexone are sometimes used to treat patients suffering from pruritus, and a number of drugs, including UDCA, rifampin and naltrexone are used off-label to treat patients suffering from cholestatic liver disease. In addition, there are product candidates in development for some of these indications.

We are aware of two other companies pursuing clinical development of therapies that reduce sBA levels via the ASBT pathway. GlaxoSmithKline plc and Albireo Pharma, Inc., or Albireo, have ASBT inhibitors in clinical development for cholestatic liver diseases. We are aware that Albireo is enrolling a Phase 3 trial for PFIC1 and PFIC2 patients for A4250, or odevixibat, and has announced plans to pursue development in BA and other cholestatic liver diseases. We are aware that GlaxoSmithKline plc is conducting a Phase 2 trial of its ASBT inhibitor in PBC patients. We are also aware that Intercept Pharmaceuticals, Inc., or Intercept, is exploring BA as an indication for obeticholic acid. Further, we may compete with companies that are developing gene therapy for the treatment of PFIC. In adult settings of cholestasis, similar to pediatric settings, cholestyramine, UDCA, rifampin and naltrexone are commonly used agents. We are not aware of FDA approved therapeutics for the treatment of PSC or ICP. We are aware of several agents in clinical development for the treatment of PSC, including Allergan plc’s cenicriviroc, Cymabay Therapeutics Inc.’s seladelpar, DURECT Corporation’s DUR928, Gilead Sciences Inc.’s GS-9674, HighTide Biopharmaceutical Inc.’s HTD1801, Intercept’s Ocaliva, or obeticholic acid and NGM Biopharmaceuticals Inc.’s NGM282. Furthermore, one of our own products, if approved, may be used off-label in the market for another of our products, if approved, adversely affecting the sales of such product.

Even though we have obtained orphan drug designation for maralixibat in PFIC and ALGS, we may not be able to obtain or maintain the benefits associated with orphan drug status, including market exclusivity.

Regulatory authorities in some jurisdictions, including the United States and the European Union, 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 a patient population of greater than 200,000 individuals in the United States, but for which there is no reasonable expectation that the cost of developing the drug will be recovered from sales in the United States. In the European Union, the EMA Committee for Orphan Medicinal Products grants orphan drug designation to promote the development of products that are intended for the diagnosis, prevention or treatment of a life-threatening or chronically debilitating condition affecting not more than five in 10,000 persons in the European Union. In September 2013, the FDA granted orphan drug status to maralixibat for the treatment of patients with PFIC and ALGS in the United States. We also received orphan drug status for maralixibat for PFIC and ALGS in the European Union in January 2014. Generally, if a drug with an orphan drug designation subsequently receives the first marketing approval for the indication for which it has such designation, the drug may be entitled to a period of marketing exclusivity, which precludes the FDA or the EMA from approving another marketing application for the same drug for that time period. Another drug may receive marketing approval prior to our product candidates. The applicable period is seven years in the United States and ten years in the European Union, which may be extended by six months and two years, respectively, in the case of product candidates that have complied with the respective regulatory agency’s agreed upon pediatric investigation plan. The exclusivity period in the European Union can be reduced to six years if a drug no longer meets the criteria for orphan drug designation or

if the drug is sufficiently profitable so that market exclusivity is no longer justified. Orphan drug exclusivity may be lost if the FDA or EMA determines that the request for designation was materially defective or if the manufacturer is unable to assure sufficient quantity of the drug to meet the needs of patients with the rare disease or condition. In addition, even after a drug is granted orphan exclusivity and approved, the FDA can subsequently approve another drug for the same condition before the expiration of the seven-year exclusivity period if the FDA concludes that the later drug is clinically superior in that it is shown to be safer, more effective or makes a major contribution to patient care. In the European Union, the EMA may deny marketing approval for a product candidate if it determines such product candidate is structurally similar to an approved product for the same indication. In addition, if an orphan designated product receives marketing approval for an indication broader than or different from what is designated, such product may not be entitled to orphan exclusivity. Even though the FDA has granted orphan drug designation to maralixibat for the treatment of PFIC and ALGS, if we receive approval for maralixibat for a modified or different indication, our current orphan designations may not provide us with exclusivity.

Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review or approval process. Also, regulatory approval for any product candidate may be withdrawn, and other product candidates may obtain approval before us and receive orphan drug exclusivity, which could block us from entering the market.

Even if we obtain orphan drug exclusivity for a product candidate, that exclusivity may not effectively protect the candidate from competition because different drugs can be approved for the same condition before the expiration of the orphan drug exclusivity period.

Although we have received a breakthrough therapy designation for maralixibat, this may not lead to a faster development, regulatory review or approval process, and it does not increase the likelihood that maralixibat will receive marketing approval in the United States.

We have received a breakthrough therapy designation for maralixibat for the treatment of PFIC2 and for the treatment of pruritus associated with ALGS in patients one year of age and older. A breakthrough therapy is defined as a therapy that is intended, alone or in combination with one or more other therapies, to treat a serious or life-threatening disease or condition, and preliminary clinical evidence indicates that the therapy 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 therapies 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. Therapies designated as breakthrough therapies by the FDA may also be eligible for priority review and accelerated approval. The breakthrough therapy designation for maralixibat may not result in a faster development process, review or approval compared to therapies considered for approval under conventional FDA procedures and does not assure ultimate approval by the FDA. In addition, the FDA may later decide that maralixibat no longer meets the conditions for qualification or decide that the time period for FDA review or approval will not be shortened.

Although the FDA has granted Rare Pediatric Disease Designation for maralixibat for ALGS, an NDA for maralixibat, if approved, may not meet the eligibility criteria for a priority review voucher.

Rare Pediatric Disease Designation has been granted for maralixibat for ALGS. In 2012, Congress authorized the FDA to award priority review vouchers to sponsors of certain rare pediatric disease product applications. This provision is designed to encourage development of new drug and biological products for prevention and treatment of certain rare pediatric diseases. Specifically, under this program, a sponsor who receives an approval for a drug or biologic for a “rare pediatric disease” may qualify for a voucher that can be redeemed to receive a priority review of a subsequent marketing application for a different product. The sponsor of a rare pediatric disease drug product receiving a priority review voucher may transfer (including by sale) the

voucher to another sponsor. The voucher may be further transferred any number of times before the voucher is used, as long as the sponsor making the transfer has not yet submitted the application. The FDA may also revoke any priority review voucher if the rare pediatric disease drug for which the voucher was awarded is not marketed in the U.S. within one year following the date of approval.

For the purposes of this program, a “rare pediatric disease” is a (a) serious or life-threatening disease in which the serious or life-threatening manifestations primarily affect individuals aged from birth to 18 years, including age groups often called neonates, infants, children, and adolescents; and (b) rare disease or conditions within the meaning of the Orphan Drug Act. Congress has only authorized the Rare Pediatric Disease Priority Review Voucher program until September 30, 2020. However, if a drug candidate receives Rare Pediatric Disease Designation before October 1, 2020, it is eligible to receive a voucher if it is approved before October 1, 2022.

However, maralixibat for ALGS may not be approved by that date, or at all, and, therefore, we may not be in a position to obtain a priority review voucher prior to expiration of the program, unless Congress further reauthorizes the program. Additionally, designation of a drug for a rare pediatric disease does not guarantee that an NDA will meet the eligibility criteria for a rare pediatric disease priority review voucher at the time the application is approved. Finally, a Rare Pediatric Disease Designation does not lead to faster development or regulatory review of the product, or increase the likelihood that it will receive marketing approval. We may or may not realize any benefit from receiving a voucher.

We may form or seek strategic alliances or enter into additional licensing arrangements in the future, and we may not realize the benefits of such alliances or licensing arrangements.

We may form or seek strategic alliances, create joint ventures or collaborations or enter into additional licensing arrangements with third parties that we believe will complement or augment our development and commercialization efforts with respect to maralixibat, volixibat and any future product candidates that we may develop. We intend to establish commercial partnerships outside of North America and in major European markets. Any of these relationships may require us to incur non-recurring and other charges, increase our near-and long-term expenditures, issue securities that dilute our existing stockholders or disrupt our management and business. In addition, we face significant competition in seeking appropriate strategic partners and the negotiation process is time-consuming and complex. Moreover, we may not be successful in our efforts to establish a strategic partnership or other alternative arrangements for volixibat because it may be deemed to be at too early of a stage of development for collaborative effort, and third parties may not view volixibat as having the requisite potential to demonstrate safety and efficacy. If we license products or businesses, we may not be able to realize the benefit of such transactions if we are unable to successfully integrate them with our existing operations and company culture. Following a strategic transaction or license, we may not achieve the revenues or specific net income that justifies such transaction. Any delays in entering into new strategic partnership agreements related to our product candidates could delay the development and commercialization of our product candidates in certain geographies for certain indications, which would harm our business prospects, financial condition and results of operations.

Our failure to successfully in-license, acquire, develop and market additional product candidates or approved products would impair our ability to grow our business.

Although a substantial amount of our efforts are focused on the clinical development, potential regulatory approval and commercialization of our product candidates, a key element of our long-term strategy is to in-license, acquire, develop, market and commercialize a portfolio of products to treat patients with liver disease. Because we do not have the necessary internal research and development capabilities, unless we build such capabilities internally, we will be dependent upon pharmaceutical companies, academic scientists and other researchers to sell or license products or technology to us. The success of this strategy depends partly upon our ability to identify and select promising biopharmaceutical product candidates and products, negotiate licensing or

acquisition agreements with their current owners and finance these arrangements. The process of proposing, negotiating and implementing a license or acquisition of a product candidate or approved product is lengthy and complex. Other companies, including some with substantially greater financial, marketing, sales and other resources, may compete with us for the license or acquisition of product candidates and approved products. We have limited resources to identify and execute the acquisition or in-licensing of third-party products, businesses and technologies and integrate them into our current infrastructure. Moreover, we may devote resources to potential acquisitions or licensing opportunities that are never completed, or we may fail to realize the anticipated benefits of such efforts. We may not be able to acquire the rights to additional product candidates on terms that we find acceptable, or at all. Further, any product candidate that we acquire may require additional development efforts prior to commercial sale, including preclinical or clinical testing and approval by the FDA, the EMA and other similar regulatory authorities. All product candidates are prone to risks of failure during biopharmaceutical product development, including the possibility that a product candidate will not be shown to be sufficiently safe and effective for approval by regulatory authorities. In addition, any approved products that we acquire may not be manufactured or sold profitably or achieve market acceptance.

We are highly dependent on our key personnel, and if we are not successful in attracting and retaining highly qualified personnel, we may not be able to successfully implement our business strategy.

Our ability to compete in the highly competitive biotechnology and pharmaceuticals industries depends upon our ability to attract and retain highly qualified managerial, scientific and medical personnel. We are highly dependent on our management, scientific and medical personnel. The loss of the services of any of our executive officers or other key employees and our inability to find suitable replacements could potentially harm our business, prospects, financial condition or results of operations.

We conduct our operations at our facility in Foster City, California. This region serves as the headquarters to many other biopharmaceutical companies and many academic and research institutions. Competition for skilled personnel in our market is intense and may limit our ability to hire and retain highly qualified personnel on acceptable terms or at all.

To induce valuable employees to remain at our company, in addition to salary and cash incentives, we have provided stock options that vest over time. The value to employees of stock options that vest over time may be significantly affected by movements in our stock price that are beyond our control and may at any time be insufficient to counteract more lucrative offers from other companies. Despite our efforts to retain valuable employees, members of our management, scientific and development teams may terminate their employment with us on short notice. Although we have offer letters with our key employees, these offer letters provide for at-will employment, which means that any of our employees could leave our employment at any time, with or without notice. We do not maintain “key man” insurance policies on the lives of these individuals or the lives of any of our other employees. Our success also depends on our ability to continue to attract, retain and motivate highly skilled junior, mid-level, and senior managers as well as junior, mid-level, and senior scientific and medical personnel.

Many of the other biotechnology and pharmaceutical companies that we compete against for qualified personnel have greater financial and other resources, different risk profiles and a longer history in the industry than we do. They may also provide more diverse opportunities and better chances for career advancement. Some of these characteristics are more appealing to high quality candidates than what we can offer. If we are unable to continue to attract and retain high quality personnel, the rate and success at which we can discover, develop and commercialize product candidates will be limited.

We will need to grow the size of our organization, and we may experience difficulties in managing this growth.

As of September 30, 2019, we had 29 employees, all of whom are full-time. As our development and commercialization plans and strategies develop, and as we transition into operating as a public company, we

expect to need additional development, managerial, operational, financial, sales, marketing and other personnel. Future growth would impose significant added responsibilities on members of management, including:

In addition, for maralixibat, we commenced enrollment in the Phase 3 March-PFIC clinical trial in the second quarter of 2019 and plan to initiate a rolling submission of an NDA for the treatment of pruritus associated with ALGS in the third quarter of 2020. Further, for volixibat for the treatment of adult patients with cholestatic liver diseases, we expect to initiate clinical trials in 2020. Our future financial performance and our ability to commercialize our product candidates will depend, in part, on our ability to effectively manage any future growth, and our management may also have to divert a disproportionate amount of its attention away from day-to-day activities in order to devote a substantial amount of time to managing these growth activities. To date, we have used the services of outside vendors to perform tasks including clinical trial management, statistics and analysis, regulatory affairs, formulation development and other drug development functions. Our growth strategy may also entail expanding our group of contractors or consultants to implement these tasks going forward. Because we rely on numerous consultants, effectively outsourcing many key functions of our business, we will need to be able to effectively manage these consultants to ensure that they successfully carry out their contractual obligations and meet expected deadlines. However, if we are unable to effectively manage our outsourced activities or if the quality or accuracy of the services provided by consultants is compromised for any reason, our clinical trials may be extended, delayed or terminated, and we may not be able to obtain regulatory approval for our product candidates or otherwise advance our business. We may not be able to manage our existing consultants or find other competent outside contractors and consultants on economically reasonable terms, or at all. If we are not able to effectively expand our organization by hiring new employees and expanding our groups of consultants and contractors, we may not be able to successfully implement the tasks necessary to further develop and commercialize our product candidates and, accordingly, may not achieve our research, development and commercialization goals.

Our internal computer systems, or those used by our CROs or other contractors or consultants, may fail or suffer security breaches.

Despite the implementation of security measures, our internal computer systems and those of our current and future CROs and other contractors and consultants are vulnerable to damage from computer viruses and unauthorized access, natural disasters, terrorism, war and telecommunication and electrical failures. While we have not experienced any such material system failure, accident or security breach to date, if such an event were to occur and cause interruptions in our operations, it could result in a material disruption of our development programs and our business operations. For example, the loss of clinical trial data from completed or future clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. Likewise, we rely on third parties to manufacture our product candidates and conduct clinical trials, and similar events relating to their computer systems could also have a material adverse effect on our business. To the extent that any disruption or security breach were to result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability and the further development and commercialization of our product candidates could be delayed.

Business disruptions could seriously harm our future revenues and financial condition and increase our costs and expenses.

Our operations, and those of our CROs and other contractors and consultants, could be subject to earthquakes, power shortages, telecommunications failures, water shortages, floods, hurricanes, typhoons, fires,

extreme weather conditions, medical epidemics and other natural or manmade disasters or business interruptions, for which we are predominantly self-insured. The occurrence of any of these business disruptions could seriously harm our operations and financial condition and increase our costs and expenses. We rely on third-party manufacturers to produce maralixibat and volixibat. Our ability to obtain clinical supplies of maralixibat and volixibat could be disrupted if the operations of these suppliers are affected by a man-made or natural disaster or other business interruption. Our corporate headquarters is located in California near major earthquake faults and fire zones. The ultimate impact on us, our significant suppliers and our general infrastructure of being located near major earthquake faults and fire zones and being consolidated in certain geographical areas is unknown, but our operations and financial condition could suffer in the event of a major earthquake, fire or other natural disaster.

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

We are exposed to the risk that employees, independent contractors, principal investigators, CROs, consultants and vendors may engage in fraudulent or other illegal activity. Misconduct by these parties could include intentional, reckless and/or negligent conduct or disclosure of unauthorized activities to us that violates: (1) the laws of the FDA and other similar foreign regulatory bodies, including those laws that require the reporting of true, complete and accurate information to the FDA and other similar foreign regulatory bodies; (2) manufacturing standards; (3) healthcare fraud and abuse laws in the United States and similar foreign fraudulent misconduct laws or (4) laws that require the true, complete and accurate reporting of our financial information or data. These laws may impact, among other things, our current activities with principal investigators and research subjects, as well as proposed and future sales, marketing and education programs. In particular, the promotion, sales and marketing of healthcare items and services, as well as certain business arrangements in the healthcare industry, are subject to extensive laws designed to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, structuring and commission(s), certain customer incentive programs and other business arrangements generally. Activities subject to these laws also involve the improper use of information obtained in the course of patient recruitment for clinical trials. If we obtain regulatory approval for any of our product candidates and begin commercializing those products in the United States and in the European Union, our potential exposure under such laws will increase significantly, and our costs associated with compliance with such laws are also likely to increase. 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, disgorgement, monetary fines, imprisonment, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs, additional reporting requirements and/or oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, contractual damages, reputational harm, diminished profits and future earnings, and curtailment of our operations.

Our relationships with customers, physicians and third-party payors may be subject, directly or indirectly, to federal and state healthcare fraud and abuse laws, false claims laws, health information privacy and security laws and other healthcare laws and regulations. If we or our employees, independent contractors, consultants, commercial partners or vendors violate these laws, we could face substantial penalties.

These laws may impact, among other things, our clinical research program, as well as our proposed and future sales, marketing and education programs. In particular, the promotion, sales and marketing of healthcare items and services is subject to extensive laws and regulations designed to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive and other business arrangements. We may also be subject to federal, state and foreign laws governing the privacy and security of identifiable

patient information. The U.S. healthcare laws and regulations that may affect our ability to operate include, but are not limited to:

We may also be subject to state and foreign equivalents of each of the healthcare laws described above, among others, some of which may be broader in scope. For example, we may be subject to the following: state 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; state laws that require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government; state laws that 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; state and local laws requiring the registration of pharmaceutical sales and medical representatives; and state and foreign laws, such as the European Union General Data Protection Regulation, or GDPR, governing 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.

Additionally, we may be subject to federal consumer protection and unfair competition laws, which broadly regulate marketplace activities and activities that potentially harm consumers.

Because of the breadth of these laws and the narrowness of the statutory exceptions and regulatory safe harbors available, it is possible that some of our business activities, or our arrangements with physicians, could be subject to challenge under one or more of such laws. If we or our employees, independent contractors, consultants, commercial partners and vendors violate these laws, we may be subject to investigations, enforcement actions and/or significant penalties. We have adopted a code of conduct, but it is not always possible to identify and deter employee misconduct or business noncompliance, and the precautions we take to detect and prevent inappropriate conduct may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. Efforts to ensure that our business arrangements will comply with applicable healthcare laws may involve substantial costs. It is possible that governmental and enforcement authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law interpreting applicable fraud and abuse or other healthcare laws and regulations. If any such actions are instituted against us, those actions could have a significant impact on our business, including the imposition of significant civil, criminal and administrative penalties, damages, disgorgement, monetary fines, imprisonment, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs, contractual damages, reputational harm, diminished profits and future earnings, additional reporting requirements and/or oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, and curtailment of our operations, any of which could adversely affect our ability to operate our business and our results of operations. In addition, the approval and commercialization of any of our product candidates outside the United States will also likely subject us to foreign equivalents of the healthcare laws mentioned above, among other foreign laws.

We are subject to restrictive regulations governing the use, processing and cross-border transfer of personal information.

The collection and use of personal data in the European Union are governed by the GDPR. The GDPR imposes stringent requirements for controllers and processors of personal data, including, for example, more robust disclosures to individuals and a strengthened individual data rights regime, shortened timelines for data breach notifications, limitations on retention of information, increased requirements pertaining to special categories of data, such as health data, and additional obligations when we contract with third-party processors in connection with the processing of the personal data. The GDPR also imposes strict rules on the transfer of personal data out of the European Union to the United States and other third countries. In addition, the GDPR provides that European Union member states may make their own further laws and regulations limiting the processing of personal data, including genetic, biometric or health data.

The GDPR applies extraterritorially, and we may be subject to the GDPR because of our data processing activities that involve the personal data of individuals residing in the European Union, such as in connection with our United Kingdom clinical trials. In addition, we maintain an office in Switzerland, which has its own set of stringent privacy and data protection laws and regulations. Failure to comply with the requirements of the GDPR and the applicable national data protection laws of the European Union member states may result in fines of up to

€20,000,000 or up to 4% of the total worldwide annual turnover of the preceding financial year, whichever is higher, and other administrative penalties. GDPR regulations may impose additional responsibility and liability in relation to the personal data that we process and we may be required to put in place additional mechanisms to ensure compliance with the new data protection rules. This may be onerous and may interrupt or delay our development activities, and adversely affect our business, financial condition, results of operations and prospects. In addition to the foregoing, a breach of the GDPR or other applicable privacy and data protection laws and regulations could result in regulatory investigations, reputational damage, orders to cease/change our use of data, enforcement notices, or potential civil claims including class action type litigation.

In addition, California recently enacted the California Consumer Privacy Act, or CCPA, which creates new individual privacy rights for California consumers (as defined in the law) and places increased privacy and security obligations on entities handling certain personal data of consumers or households. The CCPA requires covered companies to provide new disclosure to consumers about such companies’ data collection, use and sharing practices, provide such consumers new ways to opt-out of certain sales or transfers of personal information, and provide consumers with additional causes of action. The CCPA became effective January 1, 2020, and the California Attorney General may bring enforcement actions for violations beginning July 1, 2020. The CCPA was amended on September 23, 2018, and it remains unclear what, if any, further modifications will be made to this legislation or how it will be interpreted. As currently written, the CCPA may impact our business activities and exemplifies the vulnerability of our business to the evolving regulatory environment related to personal data and protected health information.

Legal, political, and economic uncertainty surrounding the planned exit of the United Kingdom, or U.K., from the EU are a source of instability and uncertainty.

On June 23, 2016, the U.K. held a referendum in which a majority of the eligible members of the electorate voted for the U.K. to leave the EU. The U.K’s withdrawal from the EU is commonly referred to as Brexit. The U.K. and the EU have agreed a withdrawal agreement, or the Withdrawal Agreement, which is expected to be approved by the U.K. Parliament in the very near future. It is expected that the U.K. will formally leave the EU on or before January 31, 2020. Under the Withdrawal Agreement, the U.K. will be subject to a transition period until December 31, 2020, or the Transition Period, during which EU rules will continue to apply. Negotiations between the U.K. and the EU are expected to continue in relation to the customs and trading relationship between the U.K. and the EU following the expiry of the Transition Period.

Since a significant proportion of the regulatory framework in the U.K. applicable to our business and our product candidates is derived from EU directives and regulations, Brexit, following the Transition Period, could materially impact the regulatory regime with respect to the development, manufacture, importation, approval and commercialization of our product candidates in the U.K. or the EU. For example, as a result of the uncertainty surrounding Brexit, the EMA relocated to Amsterdam from London. Following the Transition Period, the U.K. will no longer be covered by the centralized procedures for obtaining EU-wide marketing authorization from the EMA and, unless a specific agreement is entered into, a separate process for authorization of drug products, including our product candidates, will be required in the U.K., the potential process for which is currently unclear. Any delay in obtaining, or an inability to obtain, any marketing approvals, as a result of Brexit or otherwise, would prevent us from commercializing our product candidates in the U.K. or the EU and restrict our ability to generate revenue and achieve and sustain profitability. In addition, we may be required to pay taxes or duties or be subjected to other hurdles in connection with the importation of our product candidates into the EU, or we may incur expenses in establishing a manufacturing facility in the EU in order to circumvent such hurdles. If any of these outcomes occur, we may be forced to restrict or delay efforts to seek regulatory approval in the U.K. or the EU for our product candidates, or incur significant additional expenses to operate our business, which could significantly and materially harm or delay our ability to generate revenues or achieve profitability of our business. Any further changes in international trade, tariff and import/export regulations as a result of Brexit or otherwise may impose unexpected duty costs or other non-tariff barriers on us. These developments, or the perception that any of them could occur, may significantly reduce global trade and, in particular, trade between

the impacted nations and the U.K. It is also possible that Brexit may negatively affect our ability to attract and retain employees, particularly those from the EU.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of our product candidates.

We face an inherent risk of product liability as a result of the clinical testing of our product candidates and will face an even greater risk if we commercialize any products. For example, we may be sued if any of our product candidates causes or is perceived to cause injury or is found to be otherwise unsuitable during clinical testing, manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product, negligence, strict liability, and a breach of warranties. Claims could also be asserted under state consumer protection acts. If we cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to limit commercialization of our product candidates. Even successful defense would require significant financial and management resources. Regardless of the merits or eventual outcome, liability claims may result in:

Our inability to obtain and retain sufficient product liability insurance at an acceptable cost to protect against potential product liability claims could prevent or inhibit the commercialization of products we develop. We currently carry an aggregate of up to $10 million of product liability insurance covering our clinical trials. Although we maintain such insurance, any claim that may be brought against us could result in a court judgment or settlement in an amount that is not covered, in whole or in part, by our insurance or that is in excess of the limits of our insurance coverage. If we determine that it is prudent to increase our product liability coverage due to the commercial launch of any approved product, we may be unable to obtain such increased coverage on acceptable terms, or at all. Our insurance policies also have various exclusions, and we may be subject to a product liability claim for which we have no coverage. We will have to pay any amounts awarded by a court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient capital to pay such amounts.

We are subject to U.S. and certain foreign export and import controls, sanctions, embargoes, anti-corruption laws and anti-money laundering laws and regulations. Compliance with these legal standards could impair our ability to compete in domestic and international markets. We can face criminal liability and other serious consequences for violations, which can harm our business.

We are subject to export control and import laws and regulations, including the U.S. Export Administration Regulations, U.S. Customs regulations, and various economic and trade sanctions regulations administered by the

U.S. Treasury Department’s Office of Foreign Assets Controls, and anti-corruption and anti-money laundering laws and regulations, including the FCPA, the U.S. domestic bribery statute contained in 18 U.S.C. § 201, the U.S. Travel Act, the USA PATRIOT Act, and other state and national anti-bribery and anti-money laundering laws in the countries in which we conduct activities. Anti-corruption laws are interpreted broadly and prohibit companies and their employees, agents, clinical research organizations, contractors and other collaborators and partners from authorizing, promising, offering, providing, soliciting or receiving, directly or indirectly, improper payments or anything else of value to recipients in the public or private sector. We may engage third parties for clinical trials outside of the United States, to sell our products internationally once we enter a commercialization phase, and/or to obtain necessary permits, licenses, patent registrations and other regulatory approvals. We have direct or indirect interactions with officials and employees of government agencies or government-affiliated hospitals, universities and other organizations. We can be held liable for the corrupt or other illegal activities of our employees, agents, clinical research organizations, contractors and other collaborators and partners, even if we do not explicitly authorize or have actual 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.

We depend on intellectual property licensed from third parties and termination of any of these licenses could result in the loss of significant rights, which would harm our business.

We are dependent on patents, know-how and proprietary technology, both our own and licensed from others. We entered into an assignment and license agreement with Shire pursuant to which we were assigned exclusive global rights to license intellectual property and know-how related to maralixibat and volixibat, rights to license know-how related to maralixibat from Pfizer and certain patents and know-how related to maralixibat and volixibat from Satiogen. We have in-licensed certain patents and know-how related to volixibat from Shire and Sanofi. We are required to use commercially reasonable efforts or diligent efforts to commercialize products based on the licensed rights and to pay certain royalties based off our net sales and, in the case of Satiogen, our sublicensing revenues. We may not meet these requirements which could result in a loss or termination of any rights under such agreements. Any termination of these licenses will result in the loss of significant rights and will restrict our ability to commercialize our product candidates. See “Business—License Agreements” for a description of our license agreements, which includes a description of the termination provisions of these agreements.

We are generally also subject to all of the same risks with respect to protection of intellectual property that we license, as we are for intellectual property that we own, which are described below under “Risks Related to Our Intellectual Property.” If we or our licensors fail to adequately protect this intellectual property, our ability to commercialize products could suffer.

We rely on third parties to conduct our clinical trials. If these third parties do not successfully carry out their contractual duties or meet expected deadlines, we may not be able to obtain regulatory approval for or commercialize our product candidates.

We currently rely on, and intend to continue relying on, third-party CROs in connection with our clinical trials for maralixibat and volixibat. We control or will control only certain aspects of their activities. Nevertheless, we are responsible for ensuring that each of our clinical trials is conducted in accordance with applicable protocol, legal, regulatory and scientific standards, and our reliance on our CROs does not relieve us of our regulatory responsibilities. We and our CROs are required to comply with GCPs, which are regulations and guidelines enforced by the FDA and comparable foreign regulatory authorities for product candidates in clinical development. Regulatory authorities enforce these GCPs through periodic inspections of trial sponsors, principal investigators and trial sites. If we or any of these CROs fail to comply with applicable GCP regulations,

the clinical data generated in our clinical trials may be deemed unreliable and the FDA or comparable foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. We cannot assure you that, upon inspection, such regulatory authorities will determine that any of our clinical trials comply with the GCP regulations. In addition, our clinical trials must be conducted with drug product produced under cGMP regulations and will require a large number of test subjects. Our failure or any failure by our CROs to comply with these regulations or to recruit a sufficient number of patients may require us to repeat clinical trials, which would delay the regulatory approval process. Moreover, our business may be implicated if any of our CROs violates federal or state fraud and abuse or false claims laws and regulations or healthcare privacy and security laws.

Our CROs are not our employees and, except for remedies available to us under our agreements with such CROs, we cannot control whether or not they devote sufficient time and resources to our ongoing preclinical, clinical and nonclinical programs. These CROs may also have relationships with other commercial entities, including our competitors, for whom they may also be conducting clinical trials or other drug development activities, which could affect their performance on our behalf. If our CROs do not successfully carry out their contractual duties or obligations or meet expected deadlines, if they need to be replaced or if the quality or accuracy of the clinical data they obtain is compromised due to the failure to adhere to our clinical protocols or regulatory requirements or for other reasons, our clinical trials may be extended, delayed or terminated and we may not be able to complete development of, obtain regulatory approval for or successfully commercialize our product candidates. As a result, our financial results and the commercial prospects for our product candidates would be harmed, our costs could increase and our ability to generate revenues could be delayed.

Switching or adding CROs involves substantial cost and requires extensive management time and focus. In addition, there is a natural transition period when a new CRO commences work. As a result, delays occur, which can materially impact our ability to meet our desired clinical development timelines. Although we carefully manage our relationships with our CROs, we may encounter challenges or delays in the future and these delays or challenges may have a material adverse impact on our business, prospects, financial condition and results of operations.

We rely completely on third parties to manufacture our preclinical and clinical drug supplies and we intend to rely on third parties to produce commercial supplies of each of our product candidates, if approved, and these third parties may fail to obtain and maintain regulatory approval for their facilities, fail to provide us with sufficient quantities of drug product or fail to do so at acceptable quality levels or prices.

We do not currently have nor do we plan to acquire the infrastructure or capability internally to manufacture our clinical drug supplies for use in the conduct of our clinical trials, and we lack the resources and the capability to manufacture our product candidates on a clinical or commercial scale. Instead, we rely on contract manufacturers for such production. In particular, we rely on a number of different manufacturers to obtain our supply of maralixibat to support our clinical trial program, including different manufacturers for adult and pediatric formulations of maralixibat.

We do not currently have any long-term agreement with a manufacturer to produce raw materials, active pharmaceutical ingredients, or APIs, and the finished products of our product candidates or the associated packaging and administration syringes used in our current product format. We will need to identify and qualify a third-party manufacturer prior to commercialization of our product candidates, and we intend to enter into agreements for commercial production with third-party suppliers. As our product candidates are intended to treat rare liver diseases, we will only require a low-volume of raw materials and APIs, and in the case of maralixibat and volixibat, in some cases with single-source suppliers and manufacturers. Our reliance on third-party suppliers and manufacturers, including single-source suppliers, could harm our ability to develop our product candidates or to commercialize any product candidates that are approved. Further, any delay in identifying and qualifying a manufacturer for commercial production could delay the potential commercialization of our product candidates, and, in the event that we do not have sufficient product to complete our planned clinical trials, it could delay such trials.

The facilities used by our contract manufacturers to manufacture our product candidates must be approved by the applicable regulatory authorities, including the FDA, pursuant to inspections that will be conducted after an NDA or comparable foreign regulatory marketing application is submitted. We do not control the manufacturing process of our product candidates and are completely dependent on our contract manufacturing partners for compliance with the FDA’s cGMP requirements for manufacture of both the active drug substances and finished drug product. If our contract manufacturers cannot successfully manufacture material that conforms to our specifications and the FDA’s strict regulatory requirements, they will not be able to secure or maintain FDA approval for the manufacturing facilities. In addition, we have no control over the ability of our contract manufacturers to maintain adequate quality control, quality assurance and qualified personnel. If the FDA or any other applicable regulatory authority does not approve these facilities for the manufacture of our product candidates or if it withdraws any such approval in the future, or if our suppliers or contract manufacturers decide they no longer want to supply or manufacture for us, we may need to find alternative manufacturing facilities, in which case we might not be able to identify manufacturers for clinical or commercial supply on acceptable terms, or at all, which would significantly impact our ability to develop, obtain regulatory approval for or market maralixibat and volixibat.

In addition, the manufacture of pharmaceutical products is complex and requires significant expertise and capital investment, including the development of advanced manufacturing techniques and process controls. Manufacturers of pharmaceutical products often encounter difficulties in production, particularly in scaling up and validating initial production and absence of contamination. These problems include difficulties with production costs and yields, quality control, including stability of the product, quality assurance testing, operator error, shortages of qualified personnel, as well as compliance with strictly enforced federal, state and foreign regulations. Furthermore, if contaminants are discovered in our supply of maralixibat or volixibat or in the manufacturing facilities, such manufacturing facilities may need to be closed for an extended period of time to investigate and remedy the contamination. Any stability or other issues relating to the manufacture of our product candidates may occur in the future. Additionally, our manufacturers may experience manufacturing difficulties due to resource constraints or as a result of labor disputes or unstable political environments. If our manufacturers were to encounter any of these difficulties, or otherwise fail to comply with their contractual obligations, our ability to provide our product candidate to patients in clinical trials would be jeopardized. Any delay or interruption in the supply of clinical trial supplies could delay the completion of clinical trials, increase the costs associated with maintaining clinical trial programs and, depending upon the period of delay, require us to commence new clinical trials at additional expense or terminate clinical trials completely.

If we or our third-party manufacturers use hazardous and biological materials in a manner that causes injury or violates applicable law, we may be liable for damages.

Our research and development activities involve the controlled use of potentially hazardous substances, including chemical and biological materials, by our third-party manufacturers. Our manufacturers are subject to federal, state and local laws and regulations in the United States governing the use, manufacture, storage, handling and disposal of medical, radioactive and hazardous materials. Although we believe that our manufacturers’ procedures for using, handling, storing and disposing of these materials comply with legally prescribed standards, we cannot completely eliminate the risk of contamination or injury resulting from medical, radioactive or hazardous materials. As a result of any such contamination or injury, we may incur liability or local, city, state or federal authorities may curtail the use of these materials and interrupt our business operations. In the event of an accident, we could be held liable for damages or penalized with fines, and the liability could exceed our resources. We do not have any insurance for liabilities arising from medical radioactive or hazardous materials. Compliance with applicable environmental laws and regulations is expensive, and current or future environmental regulations may impair our research, development and production efforts, which could harm our business, prospects, financial condition or results of operations.

Our operations have consumed substantial amounts of cash since inception. We expect to continue to spend substantial amounts to continue the clinical development and seek regulatory approval of our product candidates. We will require significant additional amounts in order to prepare for commercialization, and, if approved, to launch and commercialize our product candidates.

We estimate that our net proceeds from this offering will be approximately $51.5 million, based on the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, and after deducting the underwriting discounts and commissions and estimated offering expenses payable by us. We expect our existing cash, cash equivalents and investments will be sufficient to fund our operations for at least the next 12 months, and together with the net proceeds from this offering, will allow us to complete our ongoing Phase 3 clinical trial and planned NDA submission for maralixibat, our planned clinical trials for volixibat and initial commercial preparation activities for maralixibat. However, changing circumstances may cause us to consume capital significantly faster than we currently anticipate, and we may need to spend more money than currently expected because of circumstances beyond our control. We will require additional capital for the further development and commercialization of our product candidates and may need to raise additional funds sooner if we choose to expand more rapidly than we presently anticipate.

Additional funding may not be available on acceptable terms, or at all. If we are unable to raise additional capital in sufficient amounts or on terms acceptable to us, we may have to significantly delay, scale back or discontinue the development or commercialization of maralixibat or volixibat or other research and development initiatives. We also could be required to seek collaborators for our product candidates at an earlier stage than otherwise would be desirable or on terms that are less favorable than might otherwise be available or relinquish or license on unfavorable terms our rights to our product candidates in markets where we otherwise would seek to pursue development or commercialization ourselves.

Any of the above events could significantly harm our business, prospects, financial condition and results of operations and cause the price of our common stock to decline.

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

We may seek additional capital through a combination of public and private equity offerings, debt financings, strategic partnerships and alliances and licensing arrangements. 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 stockholder. The incurrence of indebtedness would result in increased fixed payment obligations and could involve certain restrictive covenants, such as limitations on our ability to incur additional debt, limitations on our ability to acquire or license intellectual property rights and other operating restrictions that could adversely impact our ability to conduct our business. If we raise additional funds through strategic partnerships and alliances and licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies or product candidates, or grant licenses on terms unfavorable to us.

Our ability to utilize 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. To the extent that we continue to generate taxable losses, unused

losses will carry forward to offset future taxable income, if any, until such unused losses expire (if at all). At December 31, 2018, after reducing net operating losses, or NOLs, and research and development credits for amounts not expected to be utilized, we had federal and state NOL carryforwards of approximately $2.2 million and $2.2 million, respectively. The federal NOL carryforwards do not expire, and the state NOL carryforwards will begin to expire in 2038, unless previously utilized. We also have federal and state research and development credit carryforwards totaling $0.5 million and $12,000, respectively. The federal research and development credit carryforwards will begin to expire in 2038, unless previously utilized. The state research and development credits will not expire.

Under recently enacted U.S. tax legislation, federal NOL carryforwards generated in periods after December 31, 2017 may be carried forward indefinitely but may only be used to offset 80% of our taxable income annually. Our NOL carryforwards are subject to review and possible adjustment by the Internal Revenue Service and state tax authorities and may become subject to an annual limitation in the event of certain cumulative changes in the ownership interest of significant stockholders over a three-year period in excess of 50 percentage points (by value), as defined under Section 382 of the Internal Revenue Code of 1986, as amended. Our ability to utilize our NOL carryforwards and other tax attributes to offset future taxable income or tax liabilities may be limited as a result of ownership changes, including potential changes in connection with this offering. Similar rules may apply under state tax laws. We have not yet determined the amount of the cumulative change in our ownership resulting from past ownership changes or this offering or any resulting tax loss limitations. Such limitations could result in the expiration of our carryforwards before they can be utilized and, if we are profitable, our future cash flows could be adversely affected due to our increased taxable income or tax liability. We have recorded a full valuation allowance related to our NOLs and other deferred tax assets due to the uncertainty of the ultimate realization of the future benefits of those assets.

Recent U.S. tax legislation may materially adversely affect our financial condition, results of operations and cash flows.

The recently enacted Tax Act has significantly changed the U.S. federal income taxation of U.S. corporations, including by reducing the U.S. corporate income tax rate and revising the rules governing NOLs. Many of these changes are effective immediately, without any transition periods or grandfathering for existing transactions. The legislation is unclear in many respects and is subject to potential amendments and technical corrections, as well as interpretations and implementing regulations by the Treasury and U.S. Internal Revenue Service, any of which could lessen or increase certain adverse impacts of the legislation. In addition, it is unclear how these U.S. federal income tax changes will affect state and local taxation, which often uses federal taxable income as a starting point for computing state and local tax liabilities. Based on our current evaluation of this legislation, the reduction of the U.S. corporate income tax rate required a provisional write-down of our deferred income tax assets (including the value of our NOL carryforwards and our tax credit carryforwards).

There may be other material adverse effects resulting from the legislation that we have not yet identified. While some of the changes made by the tax legislation may adversely affect us in one or more reporting periods, other changes may be beneficial on a going forward basis. We continue to work with our tax advisors to determine the full impact that the recent tax legislation as a whole will have on us. We urge our investors to consult with their legal and tax advisors with respect to such legislation and the potential tax consequences of investing in our common stock.

Our commercial success will depend in part on obtaining and maintaining a combination of patents, trade secret protection and confidentiality agreements to protect the intellectual property related to our technologies.

Any unauthorized disclosure to or misappropriation by third parties of our confidential proprietary information could enable competitors to quickly duplicate or surpass our technological achievements, thus eroding our competitive position in our market.

The patent positions of biotechnology and pharmaceutical companies can be highly uncertain and involve complex legal and factual questions for which important legal principles remain unresolved. No consistent policy regarding the breadth of claims allowed in pharmaceutical patents has emerged to date in the United States or in many jurisdictions outside of the United States. Changes in either the patent laws or interpretations of patent laws in the United States and other countries may diminish the value of our intellectual property. Accordingly, we cannot predict the breadth of claims that may be enforced in the patents that may be issued from the applications we currently or may in the future own or license from third parties. Further, if any patents we obtain or license are deemed invalid and unenforceable, our ability to commercialize or license our technology could be adversely affected.

The patent application process is subject to numerous risks and uncertainties, and there can be no assurance that we or any of our actual or potential future collaborators will be successful in protecting our product candidates, proprietary technologies and their uses by obtaining and defending patents. These risks and uncertainties include the following:

The patent prosecution process is also expensive and time-consuming, and we may not be able to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner. It is also possible that we will fail to identify patentable aspects of our research and development output before it is too late to obtain patent protection. Although we enter into non-disclosure and confidentiality agreements with parties who have access to patentable aspects of our research and development output, such as our employees, corporate collaborators, outside scientific collaborators, CROs, contract manufacturers, consultants, advisors and other third parties, any of these parties may breach such agreements and disclose such output before a patent application is filed, thereby jeopardizing our ability to seek patent protection. We may also rely on trade secrets to protect our technology, especially where we do not believe patent protection is appropriate or feasible. However, trade secrets are difficult to protect. Although we use reasonable efforts to protect our trade secrets, our employees, consultants, contractors, outside scientific collaborators and other advisors may unintentionally or willfully disclose our information to competitors. Enforcing a claim that a third party illegally obtained and is using any of our trade secrets is expensive and time consuming, and the outcome is unpredictable. In addition, courts outside the United States are sometimes less willing to protect trade secrets. Moreover, our competitors may independently develop equivalent knowledge, methods and know-how.

The degree of future protection for our proprietary rights is uncertain because legal means afford only limited protection and may not adequately protect our rights or permit us to gain or keep our competitive advantage. Only limited protection may be available and may not adequately protect our rights or permit us to gain or keep any competitive advantage. If we do not adequately protect our intellectual property and proprietary technology, competitors may be able to use our product candidates and proprietary technologies and erode or negate any competitive advantage we may have, which could have a material adverse effect on our financial condition and results of operations. For example:

Others have filed, and in the future are likely to file, patent applications covering products and technologies that are similar, identical or competitive to ours or important to our business. We cannot be certain that any patent application owned by a third party will not have priority over patent applications filed or in-licensed by us, or that we or our licensors will not be involved in interference, opposition or invalidity proceedings before U.S. or non-U.S. patent offices.

We cannot be certain that the claims in our issued patents and pending patent applications covering maralixibat or volixibat will be considered patentable by the USPTO, courts in the United States, or by patent

offices and courts in foreign countries. Furthermore, the laws of some foreign countries do not protect proprietary rights to the same extent or in the same manner as the laws of the United States. As a result, we may encounter significant problems in protecting and defending our intellectual property internationally.

The strength of patents in the biotechnology and pharmaceutical fields involves complex legal and scientific questions and can be uncertain. The patent applications that we own or in-license may fail to result in issued patents with claims that cover maralixibat or volixibat in the United States or in foreign countries. Even if such patents do successfully issue, third parties may challenge the validity, enforceability or scope thereof, which may result in such patents being narrowed, invalidated or held unenforceable. Any successful opposition to our patents could deprive us of exclusive rights necessary for the successful commercialization of maralixibat or volixibat. Furthermore, even if they are unchallenged, our patents may not adequately protect our intellectual property, provide exclusivity for maralixibat or volixibat or prevent others from designing around our claims. If the breadth or strength of protection provided by the patents we hold with respect to maralixibat or volixibat is threatened, it could dissuade companies from collaborating with us to develop, or threaten our ability to commercialize, maralixibat or volixibat.

Further, if we encounter delays in our development efforts, including our clinical trials, the period of time during which we could market maralixibat or volixibat under patent protection would be reduced. In addition, patents have a limited lifespan. In the United States, the natural expiration of a patent is generally 20 years after it is filed. Various extensions may be available; however the life of a patent, and the protection it affords, is limited. A patent term extension of up to five years based on regulatory delay may be available in the United States under the Hatch-Waxman Act. However, only a single patent can be extended for each marketing approval, and any patent can be extended only once, for a single product. Moreover, the scope of protection during the period of the patent term extension does not extend to the full scope of the claim, but instead only to the scope of the product as approved. Further, a patent term extension cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval and only those claims covering such approved drug product, a method for using it or a method for manufacturing it may be extended. Laws governing analogous patent term extensions in foreign jurisdictions vary widely, as do laws governing the ability to obtain multiple patents from a single patent family. Additionally, we may not receive an extension if we fail to apply within applicable deadlines, fail to apply prior to expiration of relevant patents or otherwise fail to satisfy applicable requirements. Moreover, the applicable time period or the scope of patent protection afforded could be less than we request. If we are unable to obtain patent term extension or restoration, or the term of any such extension is less than we request, the period during which we will have the right to exclusively market our product will be shortened and our competitors may obtain approval of competing products following our patent expiration, and our revenue could be reduced.

For U.S. patent applications in which claims are entitled to a priority date before March 16, 2013, an interference proceeding can be provoked by a third party or instituted by the USPTO to determine who was the first to invent any of the subject matter covered by the patent claims of our patents or patent applications. An unfavorable outcome could require us to cease using the related technology or to attempt to license rights from the prevailing party. Our business could be harmed if the prevailing party does not offer us a license on commercially reasonable terms. Our participation in an interference proceeding may fail and, even if successful, may result in substantial costs and distract our management and other employees.

For U.S. patent applications containing a claim not entitled to priority before March 16, 2013, there is greater level of uncertainty in the patent law. In September 2011, the Leahy-Smith America Invents Act, or America Invents Act, was signed into law. The America Invents Act includes a number of significant changes to U.S. patent law, including provisions that affect the way patent applications will be prosecuted and may also affect patent litigation. The USPTO is developing regulations and procedures to govern the administration of the America Invents Act, and many of the substantive changes to patent law associated with the America Invents Act, and in particular, the “first to file” provisions, were enacted on March 16, 2013. It remains unclear what impact the America Invents Act will have on the operation of our business. Moreover, the America Invents Act

and its implementation could increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents, all of which could have a material adverse effect on our business and financial condition.

In addition to the protection afforded by patents, we rely on trade secret protection and confidentiality agreements to protect proprietary know-how that is not patentable, or that we elect not to patent, processes for which patents are difficult to enforce and any other elements of our product candidates and drug discovery and development processes that involve proprietary know-how, information or technology that is not covered by patents. However, trade secrets can be difficult to protect. We require all of our employees, consultants, advisors and any third parties who have access to our proprietary know-how, information or technology, such as third parties involved in the manufacture of our product candidates, such as maralixibat and volixibat, and third parties involved in our clinical trials to enter into confidentiality agreements. We cannot be certain that all such agreements have been duly executed, that our trade secrets and other confidential proprietary information will not be disclosed or that competitors will not otherwise gain access to our trade secrets or independently develop substantially equivalent information and techniques. Misappropriation or unauthorized disclosure of our trade secrets could impair our competitive position and may have a material adverse effect on our business. Additionally, if the steps taken to maintain our trade secrets are deemed inadequate, we may have insufficient recourse against third parties for misappropriating the trade secret. For example, the FDA, as part of its Transparency Initiative, is currently considering whether to make additional information publicly available on a routine basis, including information that we may consider to be trade secrets or other proprietary information, and it is not clear at the present time how the FDA’s disclosure policies may change in the future, if at all. If we are unable to prevent unauthorized material disclosure of our intellectual property to third parties, we may not be able to establish or maintain a competitive advantage in our market, which could materially adversely affect our business, operating results and financial condition.

We currently rely on method-of-use and formulation patents to protect maralixibat and composition-of-matter and method-of-use patents to protect volixibat.

We currently own patent applications in the United States, Europe and other countries covering the methods of treating cholestasis using ASBT inhibitors, including maralixibat and volixibat, with limited systemic exposure. We also own patent applications in Europe, and other countries covering the pediatric formulations of such ASBT inhibitors. A patent based on any of these patent applications may never be issued. We do not have patents or patent applications covering maralixibat as a composition-of-matter. Therefore, the primary patent-based intellectual property protection for our maralixibat program will be any patents granted on the pending method-of-use and formulation patent applications.

Composition-of-matter patents on active pharmaceutical ingredients are generally considered to be the strongest form of intellectual property protection for pharmaceutical products, as such patents provide protection without regard to any method of use. Method-of-use patents protect the use of a product for the specified method. Method-of-use patents do not prevent a competitor from making and marketing a product that is identical to our product for an indication that is outside the scope of the patented method. Moreover, even if competitors do not actively promote their products for our targeted indication(s), physicians may prescribe these products “off-label.” Although off-label prescriptions may infringe or contribute to the infringement of method-of-use patents, the practice is common and such infringement is difficult to prevent or prosecute.

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

The USPTO and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other similar provisions during the patent process. Periodic maintenance fees, renewal fees, annuity fees and various other governmental fees on any issued patents and/or

applications are due to be paid to the USPTO and foreign patent agencies in several stages over the lifetime of the patents and/or applications. We have systems in place to remind us to pay these fees, and we employ an outside firm and rely on our outside counsel to pay these fees due to foreign patent agencies. While an inadvertent lapse may sometimes 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 patent rights in the relevant jurisdiction. In such an event, our competitors might be able to enter the market earlier than should otherwise have been the case, which would have a material adverse effect on our business.

Changes in U.S. patent law could diminish the value of patents in general, thereby impairing our ability to protect our product candidates.

As is the case with other biotechnology and pharmaceutical companies, our success is heavily dependent on intellectual property, particularly on obtaining and enforcing patents. Our patent rights may be affected by developments or uncertainty in U.S. or foreign patent statutes, patent case law, USPTO rules and regulations or the rules and regulations of foreign patent offices. Obtaining and enforcing patents in the biotechnology industry involve both technological and legal complexity, and is therefore costly, time-consuming and inherently uncertain. In addition, the United States may, at any time, enact changes to U.S. patent law and regulations, including by legislation, by regulatory rule-making, or by judicial precedent, that adversely affect the scope of patent protection available and weakened the rights of patent owners to obtain patents, enforce patent infringement and obtain injunctions and/or damages. For example, the scope of patentable subject matter under 35 U.S.C. 101 has evolved significantly over the past several years as the Court of Appeals for the Federal Circuit and the Supreme Court issued various opinions, and the USPTO modified its guidance for practitioners on multiple occasions. Other countries may likewise enact changes to their patent laws in ways that adversely diminish the scope of patent protection and weaken the rights of patent owners to obtain patents, enforce patent infringement and obtain injunctions and/or damages. Further, the United States and other governments may, at any time, enact changes to law and regulation that create new avenues for challenging the invalidity of issued patents. For example, the America Invents Act created new administrative post-grant proceedings, including post-grant review, inter partes review, and derivation proceedings that allow third parties to challenge the validity of issued patents. In addition to increasing uncertainty with regard to our ability to obtain patents in the future, this combination of events has created uncertainty with respect to the value of patents, once obtained. Depending on decisions by the U.S. Congress, the federal courts, and the USPTO, the laws and regulations governing patents could change in unpredictable ways that could weaken our ability to obtain new patents or to enforce our existing patents and patents that we might obtain in the future.

We may not be able to protect our intellectual property rights throughout the world.

Patents are of national or regional effect. Filing, prosecuting and defending patents on our product candidates in all countries throughout the world would be prohibitively expensive. In addition, the laws of some foreign countries do not protect intellectual property rights in the same manner and to the same extent as laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States. Competitors 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 have patent protection, but enforcement of such patent protection is not as strong as that in the United States. These products may compete with our products and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

The requirements for patentability may differ in certain countries. For example, unlike other countries, China has a heightened requirement for patentability, and specifically requires a detailed description of medical uses of a claimed drug. In India, unlike the United States, there is no link between regulatory approval for a drug and its patent status. In addition to India, certain countries in Europe and developing countries, including China, have compulsory licensing laws under which a patent owner may be compelled to grant licenses to third parties.

In those countries, we may have limited remedies if patents are infringed or if we are compelled to grant a license to a third party, which could materially diminish the value of those patents. This could limit our potential revenue opportunities. Accordingly, our efforts to enforce intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we own or license.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property protection, particularly those relating to biotechnology or pharmaceutical products, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly, and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

If we fail to comply with our obligations in the agreements under which we license intellectual property rights from third parties or otherwise experience disruptions to our business relationships with our licensors, we could lose license rights that are important to our business.

We are a party to a number of license agreements under which we are granted intellectual property rights that are important to our business. For example, certain trade secrets related to maralixibat are licensed from Pfizer, and patents, patent applications and trade secrets related to volixibat are licensed from Sanofi. Our existing license agreements as related to maralixibat and volixibat impose various development, regulatory and/or commercial diligence obligations, payment of milestones and/or royalties and other obligations. If we fail to comply with our obligations under a license agreement, or we are subject to a bankruptcy, the license agreement may be terminated, in which event we would not be able to develop, commercialize or market maralixibat or volixibat, as the case may be. See “Business—License Agreements” for a description of our license agreements, which includes a description of the termination provisions of these license agreements.

Licensing of intellectual property rights is of critical importance to our business and involves complex legal, business and scientific issues. Disputes may arise between us and our licensors regarding intellectual property rights subject to a license agreement, including:

If disputes over intellectual property rights that we have licensed prevent or impair our ability to maintain our current licensing arrangements on acceptable terms, our business, results of operations, financial condition and prospects may be adversely affected. We may enter into additional licenses in the future and if we fail to comply with obligations under those agreements, we could suffer adverse consequences.

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

We may be subject to claims that former employees (including former employees of our licensors), collaborators or other third parties have an interest in our patents or other intellectual property as an inventor or co-inventor. The failure to name the proper inventors on a patent application can result in the patents issuing thereon being unenforceable. Inventorship disputes may arise from conflicting views regarding the contributions of different individuals named as inventors, the effects of foreign laws where foreign nationals are involved in the development of the subject matter of the patent, conflicting obligations of third parties involved in developing our product candidates or as a result of questions regarding co-ownership of potential joint inventions. Litigation may be necessary to resolve these and other claims challenging inventorship and/or ownership. Alternatively, or additionally, we may enter into agreements to clarify the scope of our rights in such intellectual property. If we 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, valuable intellectual property. Such an outcome could have a material adverse effect on our business. 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.

We may not be successful in obtaining or maintaining necessary rights to product components and processes for our development pipeline through acquisitions and in-licenses.

Presently we have intellectual property rights, through licenses from third parties including Shire, Pfizer, Satiogen and Sanofi, related to our product candidates. For example, we have our license agreements with Shire and Satiogen for both maralixibat and volixibat. We have our license agreement with Shire, Satiogen and Pfizer for our intellectual property rights covering maralixibat. Further, we have our license agreement with Sanofi for our intellectual property rights covering volixibat. Because our programs may require the use of additional proprietary rights held by third parties, the growth of our business will likely depend in part on our ability to acquire, in-license or use these proprietary rights. In addition, our product candidates may require specific formulations to work effectively and efficiently and these rights may be held by others. We may be unable to acquire or in-license proprietary rights related to any compositions, formulations, methods of use, processes or other intellectual property rights from third parties that we identify as being necessary for our product candidates. Even if we are able to obtain a license to such proprietary rights, it may be non-exclusive, thereby giving our competitors access to the same technologies licensed to us. In that event, we may be required to expend significant time and resources to develop or license replacement technology.

Where we obtain licenses from or collaborate with third parties, we may not have the right to control the preparation, filing and prosecution of patent applications, or to maintain the patents, covering technology that we license from third parties, or such activities, if controlled by us, may require the input of such third parties. We may also require the cooperation of our licensors and collaborators to enforce any licensed patent rights, and such cooperation may not be provided. Therefore, these patents and applications may not be prosecuted and enforced in a manner consistent with the best interests of our business, in compliance with applicable laws and regulations, which may affect the validity and enforceability of such patents or any patents that may issue from such application. Moreover, if we do obtain necessary licenses, we will likely have obligations under those licenses, including making royalty and milestone payments, and any failure to satisfy those obligations could give our licensor the right to terminate the license. Termination of a necessary license, or expiration of licensed patents or patent applications, could have a material adverse impact on our business. Our business would suffer if any such licenses terminate, if the licensors fail to abide by the terms of the license, if the licensors fail to enforce licensed patents against infringing third parties, if the licensed patents or other rights are found to be invalid or unenforceable, or if we are unable to enter into necessary licenses on acceptable terms. Furthermore, if any licenses terminate, or if the underlying patents fail to provide the intended exclusivity, competitors or other third parties may gain the freedom to seek regulatory approval of, and to market, products identical to ours. Moreover, our licensors may own or control intellectual property that has not been licensed to us and, as a result, we may be subject to claims, regardless of their merit, that we are infringing or otherwise violating the licensor’s rights. In

addition, while we cannot currently determine the amount of the royalty obligations we would be required to pay on sales of future products, if any, the amounts may be significant. The amount of our future royalty obligations will depend on the technology and intellectual property we use in products that we successfully develop and commercialize, if any. Therefore, even if we successfully develop and commercialize products, we may be unable to achieve or maintain profitability.

The licensing and acquisition of third-party proprietary rights is a competitive area, and companies, which may be more established, or have greater resources than we do, may also be pursuing strategies to license or acquire third-party proprietary rights that we may consider necessary or attractive in order to commercialize our product candidates. More established companies may have a competitive advantage over us due to their size, cash resources and greater clinical development and commercialization capabilities.

For example, we may collaborate with U.S. and foreign academic institutions to accelerate our preclinical research or development under written agreements with these institutions. Typically, these institutions provide us with an option to negotiate an exclusive license to any of the institution’s proprietary rights in technology resulting from the collaboration. Regardless of such option to negotiate a license, we may be unable to negotiate a license within the specified time frame or under terms that are acceptable to us. If we are unable to do so, the institution may offer, on an exclusive basis, their proprietary rights to other parties, potentially blocking our ability to pursue our program.

In addition, companies that perceive us to be a competitor may be unwilling to assign or license rights to us, either on reasonable terms, or at all. We also may be unable to license or acquire third-party intellectual property rights on terms that would allow us to make an appropriate return on our investment, or at all. If we are unable to successfully obtain rights to required third-party intellectual property rights on commercially reasonable terms, our ability to commercialize our products, and our business, financial condition and prospects for growth could suffer.

Third-party claims alleging intellectual property infringement may prevent or delay our drug discovery and development efforts.

Our success depends in part on our avoiding infringement of the patents and proprietary rights of third parties. There is a substantial amount of litigation, both within and outside the United States, involving patents and other intellectual property rights in the biotechnology and pharmaceutical industries, as well as administrative proceedings for challenging patents, including inter partes review, interference and reexamination proceedings before the USPTO or oppositions and other comparable proceedings in foreign jurisdictions. The America Invents Act introduced new procedures including inter partes review and post grant review. The implementation of these procedures brings uncertainty to the possibility of challenges to our patents in the future and the outcome of such challenges. Numerous U.S. and foreign issued patents and pending patent applications, which are owned by third parties, exist in the fields in which we are developing our product candidates. As the biotechnology and pharmaceutical industries expand and more patents are issued, the risk increases that our activities related to our product candidates may give rise to claims of infringement of the patent rights of others.

The pharmaceutical and biotechnology industries have produced a proliferation of patents, and it is not always clear to industry participants, including us, which patents cover various types of products or methods of use. The coverage of patents is subject to interpretation by the courts, and the interpretation is not always uniform. We cannot assure you that any of our current or future product candidates will not infringe existing or future patents. We may not be aware of patents that have already issued that a third party might assert are infringed by one of our current or future product candidates. Nevertheless, we are not aware of any issued patents that will prevent us from marketing our product candidates.

Third parties may assert that we are employing their proprietary technology without authorization. There may be third-party patents of which we are currently unaware with claims to materials, formulations, methods of

manufacture or methods for treatment related to the use or manufacture of our product candidates. Because patent applications can take many years to issue and may be confidential for 18 months or more after filing, there may be currently pending third-party patent applications which may later result in issued patents that our product candidates or our technologies may infringe, or which such third parties claim are infringed by the use of our technologies. Parties making claims against us for infringement or misappropriation of their intellectual property rights may seek and obtain injunctive or other equitable relief, which could effectively block our ability to further develop and commercialize one or more of our product candidates. Defense of these claims, regardless of their merit, could involve substantial expenses and could be a substantial diversion of employee resources from our business.

If we collaborate with third parties in the development of technology in the future, our collaborators may not properly maintain or defend our intellectual property rights or may use our proprietary information in such a way as to invite litigation that could jeopardize or invalidate our intellectual property or proprietary information or expose us to litigation or potential liability. Further, collaborators may infringe the intellectual property rights of third parties, which may expose us to litigation and potential liability. In the future, we may agree to indemnify our commercial collaborators against certain intellectual property infringement claims brought by third parties.

Any claims of patent infringement asserted by third parties would be time consuming and could:

If we are sued for patent infringement, we would need to demonstrate that our products or methods either do not infringe the patent claims of the relevant patent or that the patent claims are invalid, and we may not be able to do either. Proving invalidity 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 are successful in these proceedings, we may incur substantial costs and divert management’s time and attention in pursuing these proceedings, which could have a material adverse effect on us. If we are unable to avoid infringing the patent rights of others, we may be required to seek a license, which may not be available, defend an infringement action or challenge the validity of the patents in court. Patent litigation is costly and time consuming. We may not have sufficient resources to bring these actions to a successful conclusion. In addition, if we do not obtain a license, develop or obtain non-infringing technology, fail to defend an infringement action successfully or have infringed patents declared invalid, we may incur substantial monetary damages, encounter significant delays in bringing our product candidates to market and be precluded from manufacturing or selling our product candidates.

We do not always conduct independent reviews of pending patent applications of and patents issued to third parties. We cannot be certain that others have not filed patent applications for technology covered by our pending applications, or that we were the first to invent the technology, because:

Furthermore, the scope of a patent claim is determined by an interpretation of the law, the written disclosure in a patent and the patent’s prosecution history and can involve other factors such as expert opinion. Our interpretation of the relevance or the scope of claims in a patent or a pending application may be incorrect, which may negatively impact our ability to market our products. Further, we may incorrectly determine that our technologies, products, or product candidates are not covered by a third party patent or may incorrectly predict whether a third party’s pending patent application will issue with claims of relevant scope. Our determination of the expiration date of any patent in the United States or internationally that we consider relevant may be incorrect, which may negatively impact our ability to develop and market our products or product candidates.

Our competitors may have filed, and may in the future file, patent applications covering technology similar to ours, and others may have or obtain patents or proprietary rights that could limit our ability to make, use, sell, offer for sale or import our product candidates and future approved products or impair our competitive position. Numerous third-party U.S. and foreign issued patents and pending patent applications exist in the fields in which we are developing product candidates. There may be third-party patents or patent applications with claims to materials, formulations, methods of manufacture or methods for treatment related to the use or manufacture of our product candidates. Any such patent application may have priority over our patent applications, which could further require us to obtain rights to issued patents covering such technologies. If another party has filed a U.S. patent application on inventions similar to ours, we may have to participate in an interference proceeding declared by the USPTO to determine priority of invention in the United States. The costs of these proceedings could be substantial, and it is possible that such efforts would be unsuccessful if, unbeknownst to us, the other party had independently arrived at the same or similar invention prior to our own invention, resulting in a loss of our U.S. patent position with respect to such inventions. Other countries have similar laws that permit secrecy of patent applications and may be entitled to priority over our applications in such jurisdictions.

Some of our competitors may be able to sustain the costs of complex patent litigation more effectively than we can because they have substantially greater resources. In addition, any uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our ability to raise the funds necessary to continue our operations.

If a third party prevails in a patent infringement lawsuit against us, we may have to stop making and selling the infringing product, pay substantial damages, including treble damages and attorneys’ fees if we are found to be willfully infringing a third party’s patents, obtain one or more licenses from third parties, pay royalties or redesign our infringing products, which may be impossible or require substantial time and monetary expenditure.

We cannot predict whether any such license would be available at all or whether it would be available on commercially reasonable terms. Furthermore, even in the absence of litigation, we may need to obtain licenses from third parties to advance our research or allow commercialization of our product candidates. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all. In that event, we would be unable to further develop and commercialize our product candidates, which could harm our business significantly. Even if we were able to obtain a license, the rights may be nonexclusive, which may give our competitors access to the same intellectual property.

We may be subject to claims that we have wrongfully hired an employee from a competitor or that we or our employees have wrongfully used or disclosed alleged confidential information or trade secrets of their former employers.

As is common in the biotechnology and pharmaceutical industries, in addition to our employees, we engage the services of consultants to assist us in the development of our product candidates. Many of these consultants, and many of our employees, were previously employed at, or may have previously provided or may be currently providing consulting services to, other pharmaceutical companies including our competitors or potential competitors. We may become subject to claims that we, our employees or a consultant inadvertently or otherwise used or disclosed trade secrets or other information proprietary to their former employers or their former or current clients. Litigation may be necessary to defend against these claims. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel, which could adversely affect our business. Even if we are successful in defending against these claims, litigation could result in substantial costs and be a distraction to our management team and other employees.

We may be involved in lawsuits to protect or enforce our patents or the patents of our licensors, which could be expensive, time consuming, and unsuccessful. Further, our issued patents could be found invalid or unenforceable if challenged in court, and we may incur substantial costs as a result of litigation or other proceedings relating to patent and other intellectual property rights.

Third parties including competitors may infringe, misappropriate or otherwise violate our patents, patents that may issue to us in the future, or the patents of our licensors that are licensed to us. To counter infringement or unauthorized use, we may need to or choose to file infringement claims, which can be expensive and time-consuming. We may not be able to prevent, alone or with our licensors, misappropriation of our intellectual property rights, particularly in countries where the laws may not protect those rights as fully as in the United States.

If we choose to go to court to stop another party from using the inventions claimed in our patents, that individual or company has the right to ask the court to rule that such patents are invalid, unenforceable, or should not be enforced against that third party for any number of reasons. In patent litigation in the United States, defendant counterclaims alleging invalidity and/or unenforceability are commonplace. Grounds for a validity challenge include an alleged failure to meet any of several statutory requirements for patentability, including lack of novelty, obviousness, lack of written description, indefiniteness, or non-enablement. Grounds for an unenforceability assertion could include an allegation that someone connected with prosecution of the patent withheld relevant information from the USPTO or made a misleading statement during prosecution, i.e. committed inequitable conduct. Third parties may also raise similar claims before the USPTO, even outside the context of litigation. Similar mechanisms for challenging the validity and enforceability of a patent exist in foreign patent offices and courts and may result in the revocation, cancellation, or amendment of any foreign patents we or our licensors hold now or in the future. The outcome following legal assertions of invalidity and unenforceability is unpredictable, and prior art could render our patents or those of our licensors invalid. If a defendant were to prevail on a legal assertion of invalidity and/or unenforceability, we would lose at least part, and perhaps all, of the patent protection on such product candidate. Such a loss of patent protection would have a material adverse impact on our business.

Interference or derivation proceedings provoked by third parties or brought by us or declared by the USPTO may be necessary to determine the priority of inventions with respect to our patents or patent applications or those of our licensors. An unfavorable outcome could require us to cease using the related technology or to attempt to license rights to it from the prevailing party. Our business could be harmed if the prevailing party does not offer us a license on commercially reasonable terms or at all, or if a non-exclusive license is offered and our competitors gain access to the same technology. Our defense of litigation or interference proceedings may fail and, even if successful, may result in substantial costs and distract our management and other employees. In addition, the uncertainties associated with litigation could have a material adverse effect on our ability to raise the funds necessary to continue our clinical trials, continue our research programs, license necessary technology from third parties or enter into development or manufacturing partnerships that would help us bring our product candidates to market.

Even if resolved in our favor, litigation or other legal proceedings relating to our intellectual property rights may cause us to incur significant expenses and could distract our technical and management personnel from their normal responsibilities. In addition, there could be public announcements of the results of hearings, motions or other interim proceedings or developments and if securities analysts or investors perceive these results to be negative, it could have a substantial adverse effect on the price of our common stock. Such litigation or proceedings could substantially increase our operating losses and reduce the resources available for development activities or any future sales, marketing or distribution activities. We may not have sufficient financial or other resources to conduct such litigation or proceedings adequately. Some of our competitors may be able to sustain the costs of such litigation or proceedings more effectively than we can because of their greater financial resources. Uncertainties resulting from the initiation and continuation of patent litigation or other proceedings could compromise our ability to compete in the marketplace.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation. 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 our common stock.

Our ability to enforce our patent rights depends on our ability to detect infringement. It may be difficult to detect infringers who do not advertise the components or methods that are used in connection with their products and services. Moreover, it may be difficult or impossible to obtain evidence of infringement in a competitor’s or potential competitor’s product or service. We may not prevail in any lawsuits that we initiate and the damages or other remedies awarded if we were to prevail may not be commercially meaningful.

Because of the expense and uncertainty of litigation, we may not be in a position to enforce our intellectual property rights against third parties.

Because of the expense and uncertainty of litigation, we may conclude that even if a third party is infringing our issued patent, any patents that may be issued as a result of our pending or future patent applications or other intellectual property rights, the risk-adjusted cost of bringing and enforcing such a claim or action may be too high or not in the best interest of our company or our stockholders. In such cases, we may decide that the more prudent course of action is to simply monitor the situation or initiate or seek some other non-litigious action or solution.

If we are unable to protect the confidentiality of our trade secrets, our business and competitive position would be harmed. Our reliance on third parties requires us to share our trade secrets, which increases the possibility that a competitor will discover them or that our trade secrets will be misappropriated or disclosed.

We rely on trade secrets to protect our proprietary technologies, especially where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. We rely in part on

confidentiality agreements with our employees, consultants, outside scientific collaborators, sponsored researchers and other advisors, and inventions agreements with employees, consultants and advisors, to protect our trade secrets and other proprietary information. In addition to contractual measures, we try to protect the confidential nature of our proprietary information using commonly accepted physical and technological security measures. Despite these efforts, we cannot provide any assurances that all such agreements have been duly executed, and these agreements may not effectively prevent disclosure of confidential information and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. In addition, others may independently discover our trade secrets and proprietary information. For example, the FDA, as part of its Transparency Initiative, is currently considering whether to make additional information publicly available on a routine basis, including information that we may consider to be trade secrets or other proprietary information, and it is not clear at the present time how the FDA’s disclosure policies may change in the future, if at all. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our proprietary rights, and failure to obtain or maintain trade secret protection could adversely affect our competitive business position.

In addition, such security measures may not provide adequate protection for our proprietary information, for example, in the case of misappropriation of a trade secret by an employee, consultant, customer or third party with authorized access. Our security measures may not prevent an employee, consultant or customer from misappropriating our trade secrets and providing them to a competitor, and recourse we take against such misconduct may not provide an adequate remedy to protect our interests fully. Monitoring unauthorized uses and disclosures is difficult, and we do not know whether the steps we have taken to protect our proprietary technologies will be effective. Unauthorized parties may also attempt to copy or reverse engineer certain aspects of our products that we consider proprietary. Enforcing a claim that a party illegally disclosed or misappropriated a trade secret can be difficult, expensive and time-consuming, and the outcome is unpredictable. Even though we use commonly accepted security measures, the criteria for protection of trade secrets can vary among different jurisdictions.

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 inside and outside the United States are less willing or unwilling to protect trade secrets. Moreover, third parties may still obtain this information or may come upon this or similar information independently, and we would have no right to prevent them from using that technology or information to compete with us. Trade secrets will over time be disseminated within the industry through independent development, the publication of journal articles and the movement of personnel skilled in the art from company to company or academic to industry scientific positions. Though our agreements with third parties typically restrict the ability of our advisors, employees, collaborators, licensors, suppliers, third-party contractors and consultants to publish data potentially relating to our trade secrets, our agreements may contain certain limited publication rights. If any of our trade secrets were to be lawfully obtained or independently developed by a competitor, we would have no right to prevent such competitor from using that technology or information to compete with us, which could harm our competitive position. Because from time to time we expect to rely on third parties in the development, manufacture, and distribution of our products and provision of our services, we must, at times, share trade secrets with them. Despite employing the contractual and other security precautions described above, the need to share trade secrets increases the risk that such trade secrets become known by our competitors, are inadvertently incorporated into the technology of others, or are disclosed or used in violation of these agreements. If any of these events occurs or if we otherwise lose protection for our trade secrets, the value of this information may be greatly reduced and our competitive position would be harmed. If we do not apply for patent protection prior to such publication or if we cannot otherwise maintain the confidentiality of our proprietary technology and other confidential information, then our ability to obtain patent protection or to protect our trade secret information may be jeopardized.

If our trademarks and trade names are not adequately protected, then we may not be able to build name recognition in our markets of interest and our business may be adversely affected.

Our current or future trademarks or trade names may be challenged, infringed, circumvented or declared generic or determined to be infringing on other marks. We may not be able to protect our rights to these trademarks and trade names, which we need to build name recognition among potential partners or customers in our markets of interest. At times, competitors may adopt trade names or trademarks similar to ours, thereby impeding our ability to build brand identity and possibly leading to market confusion. In addition, there could be potential trade name or trademark infringement claims brought by owners of other trademarks or trademarks that incorporate variations of our registered or unregistered trademarks or trade names. Over the long term, if we are unable to establish name recognition based on our trademarks and trade names, then we may not be able to compete effectively and our business may be adversely affected. We may license our trademarks and trade names to third parties, such as distributors. Though these license agreements may provide guidelines for how our trademarks and trade names may be used, a breach of these agreements or misuse of our trademarks and tradenames by our licensees may jeopardize our rights in or diminish the goodwill associated with our trademarks and trade names. Our efforts to enforce or protect our proprietary rights related to trademarks, trade names, trade secrets, domain names, copyrights or other intellectual property may be ineffective and could result in substantial costs and diversion of resources and could adversely affect our financial condition or results of operations.

Moreover, any name we have proposed to use with any of our product candidates in the United States must be approved by the FDA, regardless of whether we have registered it, or applied to register it, as a trademark.

Similar requirements exist in Europe. The FDA typically conducts a review of proposed product names, including an evaluation of potential for confusion with other product names. If the FDA (or an equivalent administrative body in a foreign jurisdiction) objects to any of our proposed proprietary product names, it may be required to expend significant additional resources in an effort to identify a suitable substitute name that would qualify under applicable trademark laws, not infringe the existing rights of third parties and be acceptable to the FDA. Furthermore, in many countries, owning and maintaining a trademark registration may not provide an adequate defense against a subsequent infringement claim asserted by the owner of a senior trademark. At times, competitors or other third parties may adopt trade names or trademarks similar to ours, thereby impeding our ability to build brand identity and possibly leading to market confusion. In addition, there could be potential trade name or trademark infringement claims brought by owners of other registered trademarks or trademarks that incorporate variations of our registered or unregistered trademarks or trade names. 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.

Any collaboration arrangements that we may enter into in the future may not be successful, which could adversely affect our ability to develop and commercialize our products.

Any future collaborations that we enter into may not be successful. The success of our collaboration arrangements will depend heavily on the efforts and activities of our collaborators. Collaborations are subject to numerous risks, which may include that:

We have broad discretion in the use of the net proceeds from this offering and may not use them effectively.

Our management will have broad discretion in the application of the net proceeds to us from this offering and could spend the proceeds in ways that do not improve our results of operations or enhance the value of our common stock. The failure by our management to apply these funds effectively could result in financial losses that could have a material adverse effect on our business, cause the price of our common stock to decline and delay the development of our drug candidates. Pending their use, we may invest the net proceeds from this offering in short-term, investment-grade, interest-bearing instruments.

If you purchase shares of common stock in this offering, you will suffer immediate dilution of your investment.

The public offering price of our common stock is substantially higher than the as adjusted net tangible book value per share of our common stock. Therefore, if you purchase shares of our common stock in this offering, you will pay a price per share that substantially exceeds our as adjusted net tangible book value per share after this offering. To the extent shares subsequently are issued under outstanding options, you will incur further dilution. Based on the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, and after deducting the underwriting discounts and commissions and estimated offering expenses payable by us, you will experience immediate dilution of $15.24 per share, representing the difference between our as adjusted net tangible book value per share after giving effect to this offering and the public offering price.

The trading price of our common stock may be volatile, and you could lose all or part of your investment.

The trading price of our common stock is likely to be highly volatile and could be subject to wide fluctuations in response to various factors, some of which are beyond our control, including limited trading volume. For example, the closing price of our common stock since its trading began on July 18, 2019 and to January 3, 2020 has ranged from a low of $6.84 to a high of $25.90. In addition to the factors discussed in this “Risk Factors” section, these factors include:

In addition, the stock market in general, and Nasdaq-listed and biotechnology companies in particular, have experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of these companies. Broad market and industry factors may negatively affect the market price of our common stock, regardless of our actual operating performance. In the past, securities class action litigation has often been instituted against companies following periods of volatility in the market price of a company’s securities. This type of litigation, if instituted, could result in substantial costs and a diversion of management’s attention and resources, which would harm our business, operating results or financial condition.

We do not intend to pay dividends on our common stock so any returns will be limited to the value of our stock.

We have never declared or paid any cash dividend on our common stock. We currently anticipate that we will retain future earnings for the development, operation and expansion of our business and do not anticipate declaring or paying any cash dividends for the foreseeable future. Any return to stockholders will therefore be limited to the appreciation of their stock.

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

Our executive officers and directors, combined with our stockholders who own more than 5% of our outstanding capital stock, beneficially own shares representing a significant percentage of our common stock. Therefore, these stockholders have the ability to influence us through this ownership position. These stockholders may be able to determine all matters requiring stockholder approval. For example, these stockholders may be able to control elections of directors, amendments of our organizational documents, or approval of any merger, sale of assets, or other major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common stock that you may feel are in your best interest as one of our stockholders.

We are an emerging growth company and a smaller reporting company, and the reduced reporting requirements applicable to emerging growth companies and smaller reporting companies may make our common stock less attractive to investors.

We are an emerging growth company, as defined in 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 not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in this prospectus and our periodic reports and proxy statements and exemptions from the requirements of holding nonbinding advisory votes on executive compensation and stockholder approval of any golden parachute payments not previously approved. We could be an emerging growth company until December 31, 2024, although circumstances could cause us to lose that status earlier, including if the market value of our common stock held by non-affiliates exceeds $700.0 million as of any June 30 before that time or if we have total annual gross revenue of $1.07 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, we would cease to 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 and reduced disclosure obligations regarding executive compensation in this prospectus and our periodic reports and proxy statements. Investors may 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 stock 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 irrevocably elected not to avail ourselves of this exemption from new or revised accounting standards and, therefore, will be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies. As a result, changes in rules of GAAP or their interpretation, the adoption of new guidance or the application of existing guidance to changes in our business could significantly affect our financial position and results of operations.

If we fail to maintain proper and effective internal controls, our ability to produce accurate financial statements on a timely basis could be impaired.

We are subject to the reporting requirements of the Exchange Act, the Sarbanes-Oxley Act and the rules and regulations of Nasdaq. The Sarbanes-Oxley Act requires, among other things, that we maintain effective disclosure controls and procedures and internal controls over financial reporting. Commencing with our fiscal year ending December 31, 2020, we must perform system and process evaluation and testing of our internal controls over financial reporting to allow management to report on the effectiveness of our internal controls over financial reporting in our Form 10-K filing for that year, as required by Section 404 of the Sarbanes-Oxley Act. This will require that we incur substantial additional professional fees and internal costs to expand our accounting and finance functions and that we expend significant management efforts. Prior to our initial public offering, we have never been required to test our internal controls within a specified period, and, as a result, we may experience difficulty in meeting these reporting requirements in a timely manner.

We may discover weaknesses in our system of internal financial and accounting controls and procedures that could result in a material misstatement of our consolidated financial statements. 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.

If we are not able to comply with the requirements of Section 404 of the Sarbanes-Oxley Act in a timely manner, or if we are unable to maintain proper and effective internal controls, we may not be able to produce timely and accurate financial statements. If that were to happen, the market price of our stock could decline and we could be subject to sanctions or investigations by Nasdaq, the SEC or other regulatory authorities.

We have incurred and will continue to incur significant 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.

As a public company, we have incurred and will continue to incur significant legal, accounting and other expenses that we did not incur as a private company. We are subject to the reporting requirements of the Exchange Act, which require, among other things, that we file with the SEC annual, quarterly and current reports with respect to our business and financial condition. In addition, the Sarbanes-Oxley Act, as well as rules subsequently adopted by the SEC and Nasdaq to implement provisions of the Sarbanes-Oxley Act, impose significant requirements on public companies, including requiring establishment and maintenance of effective disclosure and financial controls and changes in corporate governance practices. Further, in July 2010, the Dodd-Frank Wall Street Reform and Consumer Protection Act, or the Dodd-Frank Act, was enacted. There are significant corporate governance and executive compensation related provisions in the Dodd-Frank Act that require the SEC to adopt additional rules and regulations in these areas such as “say on pay” and proxy access. Recent legislation permits emerging growth companies to implement many of these requirements over a longer period. We intend to take advantage of this new legislation, but we may be required to implement these requirements sooner than budgeted or planned and thereby incur unexpected expenses. Stockholder activism, the current political environment and the current high level of government intervention and regulatory reform may lead to substantial new regulations and disclosure obligations, which may lead to additional compliance costs and impact the manner in which we operate our business in ways we cannot currently anticipate.

We expect the rules and regulations applicable to public companies to continue to substantially increase our legal and financial compliance costs and to make some activities more time-consuming and costly. If these requirements divert the attention of our management and personnel from other business concerns, they could have a material adverse effect on our business, financial condition and results of operations. The increased costs will decrease our net income or increase our consolidated net loss and may require us to reduce costs in other areas of our business or increase the prices of our products or services. For example, we expect these rules and regulations to make it more difficult and more expensive for us to obtain director and officer liability insurance and we may be required to incur substantial costs to maintain the same or similar 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 of directors, our board committees or as executive officers.

Sales of a substantial number of shares of our common stock in the public market could cause our stock price to fall.

Sales of a substantial number of shares of our common stock in the public market could occur at any time. 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. As of September 30, 2019, there were 22,989,987 shares of our common stock outstanding, including 423,047 shares subject to repurchase, as described in the notes to our consolidated financial statements included elsewhere in this prospectus. Subject to certain limitations, 17,989,987 of these shares will become eligible for sale upon expiration of the lock-up period. Sales of stock by these stockholders could have a material adverse effect on the trading price of our common stock.

In connection with this offering, we, our officers and directors, and certain of our security holders have agreed that, subject to certain specified exceptions, for a period of 90 days from the date of this prospectus, we and they will not, without the prior written consent of Citigroup Global Markets Inc. and Evercore Group L.L.C., dispose of or hedge any shares or any securities convertible into or exchangeable for our common stock. Citigroup Global Markets Inc. and Evercore Group L.L.C. in their sole discretion may release any of the securities subject to these lock-up agreements at any time.

In addition, in connection with our initial public offering, all of our directors, executive officers and the holders of all of our common stock and securities exercisable for or convertible into our common stock

outstanding immediately prior to the closing of our initial public offering, have agreed with Citigroup Global Markets Inc. and Evercore Group L.L.C. that, until January 14, 2020, they will not, without the prior written consent of Citigroup Global Markets Inc. and Evercore Group L.L.C., subject to certain exceptions, directly or indirectly, offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase or otherwise transfer or dispose of any of our shares of common stock, or any securities convertible into or exercisable or exchangeable for shares of our common stock, or enter into any swap or any other agreement or any transaction that transfers, in whole or in part, directly or indirectly, the economic consequence of ownership of the securities, whether any such swap or transaction is to be settled by delivery of our common stock or other securities, in cash or otherwise. We refer to such period as the lock-up period. When the lock-up period expires, our securityholders subject to a lock-up agreement or market stand-off agreement will be able to sell our shares in the public market. Citigroup Global Markets Inc. and Evercore Group L.L.C. may, in their sole discretion, release any of the securities subject to these lock-up agreements at any time. Sales of a substantial number of such shares upon expiration of the lock-up agreements, the perception that such sales may occur, or early release of these agreements, could cause our market price to fall or make it more difficult for you to sell your common stock at a time and price that you deem appropriate.

In addition, shares of common stock that are either subject to outstanding options or reserved for future issuance under our employee benefit plans will become eligible for sale in the public market to the extent permitted by the provisions of various vesting schedules, the lock-up agreements and Rule 144 and Rule 701 under the Securities Act. If these additional shares of common stock are sold, or if it is perceived that they will be sold, in the public market, the trading price of our common stock could decline.

Further, the holders of 16,828,269 shares of our common stock are entitled to rights with respect to the registration of their shares under the Securities Act, subject to the lock-up agreements described above. Registration of these shares under the Securities Act would result in the shares becoming freely tradable without restriction under the Securities Act, except for shares held by affiliates, as defined in Rule 144 under the Securities Act. Any sales of securities by these stockholders could have a material adverse effect on the trading price of our common stock.

Future sales and issuances of our common stock or rights to purchase common stock, including pursuant to our equity incentive plans, could result in additional dilution of the percentage ownership of our stockholders and could cause our stock price to fall.

We expect that significant additional capital may be needed in the future to continue our planned operations, including conducting clinical trials, commercialization efforts, expanded research and development activities and costs associated with operating a public company. 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. If we sell common stock, convertible securities or other equity securities, investors may be materially diluted by subsequent sales. Such sales may also result in material dilution to our existing stockholders, and new investors could gain rights, preferences and privileges senior to the holders of our common stock.

Pursuant to our 2019 Plan, our management is authorized to grant stock options to our employees, directors and consultants. Additionally, the number of shares of our common stock reserved for issuance under our 2019 Plan is subject to an automatic increase on January 1 of each year through and including January 1, 2029, by 5.0% of the total number of shares of our capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by our board of directors. Unless our board of directors elects not to increase the number of shares available for future grant each year, our stockholders may experience additional dilution, which could cause our stock price to fall.

Our business could be negatively affected as a result of actions of activist stockholders, and such activism could impact the trading value of our securities.

Stockholders may, from time to time, engage in proxy solicitations or advance stockholder proposals, or otherwise attempt to effect changes and assert influence on our board of directors and management. Activist campaigns that contest or conflict with our strategic direction or seek changes in the composition of our board of directors could have an adverse effect on our operating results and financial condition. A proxy contest would require us to incur significant legal and advisory fees, proxy solicitation expenses and administrative and associated costs and require significant time and attention by our board of directors and management, diverting their attention from the pursuit of our business strategy. Any perceived uncertainties as to our future direction and control, our ability to execute on our strategy, or changes to the composition of our board of directors or senior management team arising from a proxy contest could lead to the perception of a change in the direction of our business or instability which may result in the loss of potential business opportunities, make it more difficult to pursue our strategic initiatives, or limit our ability to attract and retain qualified personnel and business partners, any of which could adversely affect our business and operating results. If individuals are ultimately elected to our board of directors with a specific agenda, it may adversely affect our ability to effectively implement our business strategy and create additional value for our stockholders. We may choose to initiate, or may become subject to, litigation as a result of the proxy contest or matters arising from the proxy contest, which would serve as a further distraction to our board of directors and management and would require us to incur significant additional costs. In addition, actions such as those described above could cause significant fluctuations in our stock price based upon temporary or speculative market perceptions or other factors that do not necessarily reflect the underlying fundamentals and prospects of our business.

Our failure to meet Nasdaq’s continued listing requirements could result in a delisting of our common stock.

If we fail to satisfy the continued listing requirements of Nasdaq, such as the corporate governance requirements or the minimum closing bid price requirement, Nasdaq may take steps to delist our common stock. Such a delisting would likely have a negative effect on the price of our common stock and would impair your ability to sell or purchase our common stock when you wish to do so. In the event of a delisting, we can provide no assurance that any action taken by us to restore compliance with listing requirements would allow our common stock to become listed again, stabilize the market price or improve the liquidity of our common stock, prevent our common stock from dropping below the Nasdaq minimum bid price requirement or prevent future non-compliance with the listing requirements of Nasdaq.

Anti-takeover provisions under our charter documents and Delaware law could delay or prevent a change of control which could limit the market price of our common stock and may prevent or frustrate attempts by our stockholders to replace or remove our current management.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that could delay or prevent a change of control of our company or changes in our board of directors that our stockholders might consider favorable. Some of these provisions include:

In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporate Law, which may prohibit certain business combinations with stockholders owning 15% or more of our outstanding voting stock. These anti-takeover provisions and other provisions in our amended and restated certificate of incorporation and amended and restated bylaws could make it more difficult for stockholders or potential acquirors to obtain control of our board of directors or initiate actions that are opposed by the then-current board of directors and could also delay or impede a merger, tender offer or proxy contest involving our company. These provisions could also discourage proxy contests and make it more difficult for you and other stockholders to elect directors of your choosing or cause us to take other corporate actions you desire. Any delay or prevention of a change of control transaction or changes in our board of directors could cause the market price of our common stock to decline.

Our amended and restated certificate of incorporation and amended and restated bylaws provide that the Court of Chancery of the State of Delaware will be the exclusive forum for substantially all disputes between us and our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers or employees.

Our amended and restated certificate of incorporation and amended and restated bylaws provide that the Court of Chancery of the State of Delaware will be the sole and exclusive forum for the following types of actions or proceedings under Delaware statutory or common law: (i) any derivative action or proceeding brought on our behalf; (ii) any action or proceeding asserting a claim of breach of a fiduciary duty owed by any of our current or former directors, officers or other employees to us or our stockholders; (iii) any action or proceeding asserting a claim against us or any of our current or former directors, officers or other employees, arising out of or pursuant to any provision of the Delaware General Corporation Law, our amended and restated certificate of incorporation or our amended and restated bylaws; (iv) any action or proceeding to interpret, apply, enforce or determine the validity of our amended and restated certificate of incorporation or our amended and restated bylaws; (v) any action or proceeding as to which the Delaware General Corporation Law confers jurisdiction to the Court of Chancery of the State of Delaware; and (vi) any action asserting a claim against us or any of our directors, officers or other employees governed by the internal affairs doctrine, in all cases to the fullest extent permitted by law and subject to the court’s having personal jurisdiction over the indispensable parties named as defendants; provided these provisions of our amended and restated certificate of incorporation and amended and restated bylaws apply to suits brought to enforce a duty or liability created by the Securities Act, but stockholders will not be deemed to have waived our compliance with the federal securities laws and the regulations thereunder; and provided these provisions of our amended and restated certificate of incorporation and amended and restated bylaws do not apply to suits brought to enforce a duty or liability created by the Exchange Act, or any other claim for which the federal courts have exclusive jurisdiction.

In addition, our amended and restated certificate of incorporation and amended and restated bylaws provide that the federal district courts of the United States of America will be the exclusive forum for resolving any complaint asserting a cause of action arising under the Securities Act, unless we consent in writing to the selection of an alternative forum.

These exclusive-forum provisions may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers or other employees and may discourage these types of lawsuits. Furthermore, the enforceability of similar choice of forum provisions in other companies’ certificates of incorporation has been challenged in legal proceedings, and it is possible that a court could find these types of provisions to be inapplicable or unenforceable. For example, the Court of Chancery of the State of Delaware recently determined that a provision stating that U.S. federal district courts are the exclusive forum for resolving any complaint asserting a cause of action arising under the Securities Act is not enforceable. However, this decision may be reviewed and ultimately overturned by the Delaware Supreme Court. If a court were to find either exclusive-forum provision contained in our amended and restated certificate of incorporation or amended and restated bylaws to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions.

If securities or industry analysts publish inaccurate or unfavorable research about our business, our stock price and trading volume could decline.

The trading market for our common stock depends in part on the research and reports that securities or industry analysts publish about us or our business. If one or more of the analysts who covers us downgrades our stock or publishes inaccurate or unfavorable research about our business, our stock price may decline. If one or more of these analysts ceases coverage of our company or fails to publish reports on us regularly, demand for our stock could decrease, which might cause our stock price and trading volume to decline.

This prospectus contains forward-looking statements within the meaning of Section 27A of the Securities Act, Section 21E of the Exchange Act, and the Private Securities Litigation Reform Act of 1995, as amended, that involve substantial risks and uncertainties. All statements other than statements of historical facts contained in this prospectus, including statements regarding our future results of operations and financial position, business strategy, research and development costs, the anticipated timing, costs and conduct of our planned clinical trials for maralixibat and volixibat, the timing and likelihood of regulatory filings and approvals for maralixibat and volixibat, our ability to commercialize maralixibat and volixibat, if approved, the pricing and reimbursement of maralixibat and volixibat, if approved, the potential benefits of strategic collaborations and our ability to enter into strategic arrangements, timing and likelihood of success, plans and objectives of management for future operations, and future results of anticipated products are forward-looking statements. These statements involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements.

In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “expect,” “plan,” “anticipate,” “could,” “intend,” “target,” “project,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these terms or other similar expressions. The forward-looking statements in this prospectus are only predictions. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition and results of operations. These forward-looking statements speak only as of the date of this prospectus and are subject to a number of risks, uncertainties and assumptions described under the sections in this prospectus entitled “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in this prospectus. Because forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified and some of which are beyond our control, you should not rely on these forward-looking statements as predictions of future events. The events and circumstances reflected in our forward-looking statements may not be achieved or occur and actual results could differ materially from those projected in the forward-looking statements. Moreover, we operate in an evolving environment. New risk factors and uncertainties may emerge from time to time, and it is not possible for management to predict all risk factors and uncertainties. Except as required by applicable law, we undertake no obligation to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise. You should, however, review the factors and risks we describe in the reports we will file from time to time with the SEC after the date of this prospectus. See the section titled “Where You Can Find Additional Information.”

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

We obtained the industry, market and competitive position data used throughout this prospectus from our own internal estimates and research, as well as from independent market research, industry and general publications and surveys, governmental agencies and publicly available information in addition to research, surveys and studies conducted by third parties. Internal estimates are derived from publicly available information released by industry analysts and third-party sources, our internal research and our industry experience, and are based on assumptions made by us based on such data and our knowledge of our industry and market, which we believe to be reasonable. In some cases, we do not expressly refer to the sources from which this data is derived. In that regard, when we refer to one or more sources of this type of data in any paragraph, you should assume that other data of this type appearing in the same paragraph is derived from the same sources, unless otherwise expressly stated or the context otherwise requires. In addition, while we believe the industry, market and competitive position data included in this prospectus is reliable and based on reasonable assumptions, such data involve risks and uncertainties and are subject to change based on various factors, including those discussed in the section titled “Risk Factors.” These and other factors could cause results to differ materially from those expressed in the estimates made by the independent parties or by us.

We estimate that we will receive net proceeds from this offering of approximately $51.5 million (or approximately $59.2 million if the underwriters’ option to purchase 360,000 additional shares of our common stock is exercised in full) based on the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

A $1.00 increase (decrease) in the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, would increase (decrease) the net proceeds to us from this offering by approximately $2.3 million, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. Similarly, each increase (decrease) of 1.0 million shares in the number of shares of common stock offered by us would increase (decrease) the net proceeds to us from this offering by approximately $21.6 million, assuming the public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, remains the same, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

We anticipate that we will use the net proceeds from this offering, together with our existing cash, cash equivalents and investments, as follows:

We may also use a portion of the remaining net proceeds and our existing cash, cash equivalents and investments to in-license, acquire, or invest in complementary businesses, technologies, products or assets. However, we have no current commitments or obligations to do so.

We expect our existing cash, cash equivalents and investments will be sufficient to fund our operations for at least the next 12 months, and together with the net proceeds from this offering, will allow us to complete our ongoing Phase 3 clinical trial and planned NDA submission for maralixibat, our planned clinical trials for volixibat and initial commercial preparation activities for maralixibat. However, our expected use of proceeds from this offering described above represents our current intentions based on our present plans and business condition. As of the date of this prospectus, we cannot predict with certainty all of the particular uses for the proceeds to be received upon the closing of this offering or the actual amounts that we will spend on the uses set forth above. The net proceeds from this offering, together with our cash, cash equivalents and investments, may not be sufficient for us to fund all of our product candidates through regulatory approval, and we will need to raise additional capital to complete the development and commercialization of all of our product candidates.

The amounts and timing of our actual expenditures will depend on numerous factors, including the time and cost necessary to conduct our planned clinical trials, the results of our planned clinical trials and other factors described in the section titled “Risk Factors” in this prospectus, as well as the amount of cash used in our operations and any unforeseen cash needs. Therefore, our actual expenditures may differ materially from the estimates described above. We may find it necessary or advisable to use the net proceeds for other purposes, and we will have broad discretion in the application of the net proceeds.

We will have broad discretion over how to use the net proceeds to us from this offering. We intend to invest the net proceeds to us from the offering that are not used as described above in short-term, investment-grade, interest-bearing instruments.

Since inception, we have never declared or paid any cash dividends on our capital stock, and we do not anticipate declaring or paying, in the foreseeable future, any cash dividends on our capital stock. We intend to retain all available funds and future earnings, if any, to fund the development and expansion of our business, and we do not anticipate paying any cash dividends in the foreseeable future. Any future determination regarding the declaration and payment of dividends, if any, will be at the discretion of our board of directors and will depend on then-existing conditions, including our financial condition, operating results, contractual restrictions, capital requirements, business prospects and other factors our board of directors may deem relevant.

The following table sets forth our cash, cash equivalents and investments and capitalization as of September 30, 2019:

The as adjusted information below is illustrative only and our capitalization following the completion of this offering is subject to adjustment based on the actual public offering price of our common stock and other terms of this offering determined at pricing.

You should read this table together with “Selected Consolidated Financial Data,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” “Description of Capital Stock” and our consolidated financial statements and related notes included elsewhere in this prospectus.

A $1.00 increase (decrease) in the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, would increase (decrease) each of our as adjusted cash, cash equivalents and investments, additional paid-in capital, total stockholders’ equity and total capitalization by approximately $2.3 million, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. Similarly, each increase (decrease) of 1.0 million shares in the number of shares common stock offered by us would increase (decrease) each of our as adjusted cash, cash equivalents and investments, additional paid-in capital, total stockholders’ equity and total capitalization by approximately $21.6 million, assuming the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, remains the same, and after deducting the underwriting discounts and commissions and estimated offering expenses payable by us.

If the underwriters’ option to purchase additional shares of our common stock from us is exercised in full, as adjusted cash, cash equivalents and investments, additional paid-in capital, total stockholders’ equity, total capitalization and shares of common stock outstanding as of September 30, 2019 would be $212.8 million, $257.3 million, $205.5 million, $205.5 million and 25,326,940 shares, excluding 423,047 shares subject to repurchase, respectively.

If you invest in our common stock in this offering, your interest will be diluted to the extent of the difference between the public offering price per share of common stock and the as adjusted net tangible book value per share immediately after this offering.

As of September 30, 2019, we had a historical net tangible book value of $146.2 million, or $6.36 per share of common stock based on 22,989,987 shares of common stock outstanding, including 423,047 shares subject to repurchase as of such date. Our historical net tangible book value per share represents total tangible assets less total liabilities, divided by the number of shares of common stock outstanding, including shares subject to repurchase at September 30, 2019.

After giving effect to the sale by us of 2,400,000 shares of common stock in this offering at the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us, our as adjusted net tangible book value as of September 30, 2019 would have been $197.7 million, or $7.79 per share. This amount represents an immediate increase in our as adjusted net tangible book value of $1.43 per share to our existing stockholders and an immediate dilution in our as adjusted net tangible book value of $15.24 per share to investors purchasing common stock in this offering. We determine dilution by subtracting our as adjusted net tangible book value per share after this offering from the amount of cash paid by an investor for a share of common stock in this offering. The following table illustrates this dilution on a per share basis:

Each $1.00 increase (decrease) in the assumed public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020, would increase (decrease) the as adjusted net tangible book value per share after this offering by approximately $0.08 $(0.09), and dilution in as adjusted net tangible book value per share to new investors by approximately $0.92 $(0.91), assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting the underwriting discounts and commissions and the estimated offering expenses payable by us. Similarly, each increase or decrease of 1.0 million shares in the number of shares of common stock offered by us would increase (decrease) our pro forma as adjusted net tangible book value by approximately $0.52 $(0.57) per share and decrease (increase) the dilution to investors purchasing shares in this offering by approximately $0.52 $(0.57) per share, in each case, assuming that the assumed public offering price remains the same, and after deducting the underwriting discounts and commissions and the estimated offering expenses payable by us.

If the underwriters exercise their option to purchase 360,000 additional shares of common stock from us in full in this offering, the as adjusted net tangible book value after the offering would be $7.98 per share, the increase in as adjusted net tangible book value per share to existing stockholders would be $1.62 per share and the dilution per share to new investors would be $15.05 per share, in each case assuming a public offering price of $23.03 per share, which is the last reported sale price of our common stock on the Nasdaq Global Market on January 3, 2020.

To the extent that any outstanding options are exercised or new options are issued under our stock-based compensation plans, or we issue additional shares of common stock in the future, there will be further dilution to investors participating in this offering.

The following tables set forth our selected historical consolidated financial data as of, and for the periods ended on, the dates indicated. The selected consolidated statement of operations data for the period from May 2, 2018 to December 31, 2018 and the consolidated balance sheet data as of December 31, 2018 are derived from our audited consolidated financial statements that are included elsewhere in this prospectus. The selected consolidated statement of operations data for the period from May 2, 2018 to September 30, 2018 and the nine months ended September 30, 2019, and the balance sheet data as of September 30, 2019, are derived from our unaudited interim consolidated financial statements and notes included elsewhere in this prospectus. We have prepared the unaudited consolidated financial statements in accordance with GAAP and on the same basis as the audited consolidated financial statements and have included all adjustments, consisting of only normal recurring adjustments that, in our opinion, we consider necessary for a fair statement of the consolidated financial information set forth in those statements. Our historical results are not necessarily indicative of our results in any future period, and the results for the nine months ended September 30, 2019, are not necessarily indicative of results to be expected for the full year or any other period.

You should read the following selected consolidated financial data together with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and the related notes included elsewhere in this prospectus. The selected consolidated financial data in this section are not intended to replace our consolidated financial statements and the related notes and are qualified in their entirety by the consolidated financial statements and related notes included elsewhere in this prospectus.

The following discussion should be read in conjunction with the “Selected Consolidated Financial Data” and our consolidated financial statements and related notes thereto included elsewhere in this prospectus. In addition to historical information, this discussion contains forward-looking statements that involve risks, uncertainties and assumptions that could cause actual results to differ materially from management’s expectations. Factors that could cause such differences are discussed in the sections entitled “Special Note Regarding Forward-Looking Statements” and “Risk Factors.” We are not undertaking any obligation to update any forward-looking statements or other statements we may make in the following discussion or elsewhere in this document even though these statements may be affected by events or circumstances occurring after the forward-looking statements or other statements were made. Therefore, no reader of this document should rely on these statements being current as of any time other than the time at which this document is declared effective by the SEC.

We are a biopharmaceutical company focused on the development and commercialization of a late-stage pipeline of novel therapies for debilitating liver diseases. We focus on diseases for which the unmet medical need is high and the biology for treatment is clear. Our pipeline consists of two clinical-stage product candidates with mechanisms of action that have potential utility across a wide range of orphan cholestatic liver diseases. We are initially developing maralixibat for the treatment of pediatric patients with PFIC and ALGS. Based on improvements in pruritus, or itching, and other disease markers observed in Phase 2 clinical trials, we commenced enrollment in the Phase 3 MARCH clinical trial in PFIC in the second quarter of 2019 and are planning to initiate a rolling submission of an NDA, for the treatment of pruritus associated with ALGS in the third quarter of 2020. We are developing volixibat for the treatment of adult patients with cholestatic liver diseases and expect to initiate clinical trials in these indications in 2020. In addition to data from ongoing clinical trials of maralixibat, we expect to complete enrollment in the MARCH clinical trial in the second quarter of 2020 and announce topline Phase 3 data in late-2020. We also expect to report clinical data for volixibat in 2022.

We were incorporated in May 2018 and commenced operations in November 2018. To date, we have focused primarily on acquiring and in-licensing our product candidates, maralixibat and volixibat, organizing and staffing our company, business planning, raising capital, and preparing for advancement of our product candidates into clinical development.

We have incurred significant operating losses since our inception, and expect to continue to incur significant operating losses for the foreseeable future. We have no products approved for commercial sale and have never generated any revenues from product sales. Through September 30, 2019, we have raised net cash proceeds of $187.0 million to fund operations through equity financings. Our net loss was $34.6 million and $0.1 million for the nine months ended September 30, 2019 and the period from May 2, 2018 to September 30, 2018, respectively. As of September 30, 2019, we had an accumulated deficit of $51.9 million and cash, cash equivalents and investments of $153.6 million.

We expect our expenses and operating losses will increase substantially as we conduct our planned clinical trials, continue our research and development activities, initiate commercial preparation activities, conduct preclinical studies, and seek regulatory approvals for our product candidates, as well as hire additional personnel, protect our intellectual property and continue to incur additional costs associated with being a public company. In addition, as our product candidates progress through development and toward commercialization, we will need to make milestone payments to the licensors and other third parties from whom we have in-licensed or acquired our product candidates. Our net losses may fluctuate significantly from quarter-to-quarter and year-to-year, depending in particular on the timing of our clinical trials and preclinical studies and our expenditures on other research and development activities.

We do not expect to generate any revenue from product sales unless and until we successfully complete development and obtain regulatory approval for one or more of our product candidates, which could take a number of years. If we obtain regulatory approval for any of our product candidates, we expect to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution.

Accordingly, until such time as we can generate substantial product revenues to support our cost structure, if ever, we expect to finance our cash needs through equity offerings, debt financings or other capital sources, including potential collaborations, licenses and other similar arrangements. However, we may be unable to raise additional funds or enter into such other arrangements when needed on favorable terms or at all. Our failure to raise capital or enter into such other arrangements when needed could have a negative impact on our financial condition and on our ability to pursue our business plans and strategies. If we are unable to raise additional capital when needed, we could be forced to delay, limit, reduce or terminate our product candidate development or future commercialization efforts or grant rights to develop and market our product candidates even if we would otherwise prefer to develop and market such product candidates ourselves.

On July 22, 2019, we completed our initial public offering, pursuant to which we sold an aggregate of 5,000,000 shares of our common stock at a price of $15.00 per share, resulting in net proceeds of $67.2 million after deducting underwriting discounts, commissions and offering expenses payable by us. Upon the closing of our initial public offering, all outstanding shares of our Series A redeemable convertible preferred stock automatically converted into 14,969,118 shares of our common stock.

In November 2018, we entered into an assignment and license agreement with Shire, or the Shire License Agreement, in which we were granted an exclusive, royalty bearing worldwide license to develop and commercialize our two product candidates, maralixibat and volixibat. As part of the Shire License Agreement, we were assigned license agreements held by Shire with Satiogen Pharmaceuticals, Inc., Pfizer Inc., and Sanofi-Aventis Deutschland GmbH. In partial consideration for the rights granted to us under the Shire License Agreement, we made an upfront payment to Shire of $7.5 million and issued Shire 1,859,151 shares of our common stock with an estimated fair value of $7.0 million.

In January 2019, we entered into a Transition Services Agreement with Shire, or the TSA, which covered services to be provided by Shire to transfer certain research and development activities and the related know-how from Shire to us, including continuation of work on any existing trials and manufacturing activities until fully transferred to us. We completed the activities under the TSA and finalized amounts due to Shire for services and pass-through expenses on existing trials and manufacturing activities in the second quarter of 2019.

In July 2019, we achieved a development milestone under the Shire License Agreement related to the initiation of the Phase 3 MARCH-PFIC clinical trial, and made a $2.5 million payment to Shire and a $0.5 million payment to Satiogen accordingly.

See Note 6 to our unaudited condensed consolidated financial statements for the three and nine months ended September 30, 2018 and 2019 included elsewhere in this prospectus.

Research and development expenses have related primarily to preclinical and clinical development of our product candidates. Our research and development expenses include or could include:

We expense research and development costs as incurred. Nonrefundable advance payments for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. The prepaid amounts are expensed as the related goods are delivered or the services are performed.

We expect to continue to incur substantial expenses related to our development activities for the foreseeable future as we continue to further our clinical development pipeline. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. We expect our research and development expenses to be significant over the next several years as we increase personnel and compensation costs and further our development programs and prepare to seek regulatory approval for our product candidates. It is difficult to determine with certainty the duration and completion costs of any clinical trial we may conduct.

Because our product candidates are still in clinical and nonclinical development and the outcome of these efforts is uncertain, we cannot estimate the actual amounts necessary to successfully complete the development and commercialization of product candidates or whether, or when, we may achieve profitability. Due to the early stage nature of our programs, we do not track costs on a project by project basis. As our programs become more advanced, we intend to track the external and internal cost of each program.

In process research and development, or IPR&D, expenses include in-process research and development acquired as part of an asset acquisition or in-license for which there is no alternative future use, are expensed as incurred.

IPR&D expenses consist of our upfront cash payment and issuance of our common stock made to Shire in connection with the acquisition to the rights of maralixibat and volixibat.

General and administrative expenses consist primarily of salaries and employee-related costs, including stock-based compensation, for personnel in executive, finance and other administrative functions. Other significant costs include facility-related costs, legal fees relating to intellectual property and corporate matters, professional fees for accounting and consulting services and insurance costs.

We expect that our general and administrative expenses will increase in the future as we expand our operating activities, increase headcount, as well as incur additional costs associated with being a publicly traded company and maintaining compliance with exchange listing and SEC requirements. These increases will likely include increased personnel expenses, legal fees, accounting fees, directors’ and officers’ liability insurance premiums and fees associated with investor relations and maintaining compliance with exchange listing and SEC requirements associated with operating as a public company.

Interest income consists of interest earned on our cash, cash equivalents and investments.

Our management’s discussion and analysis of our financial condition and results of operations are based on our consolidated financial statements, which have been prepared in accordance with GAAP. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. We base our estimates on historical experience, known trends and events, and various other factors

that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from these estimates under different assumptions or conditions.

While our significant accounting policies are described in more detail in the notes to our consolidated financial statements appearing elsewhere in this prospectus, we believe the following accounting policies are the most critical for fully understanding and evaluating our financial condition and results of operations.

As part of the process of preparing our consolidated financial statements, we are required to estimate our accrued expenses as of each balance sheet date. This process involves reviewing open contracts and purchase orders, communicating with our personnel to identify services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of the actual cost. We accrue and expense clinical trial activities performed by third parties based upon estimates of the proportion of work completed over the life of the individual study and patient enrollment rates in accordance with agreements established with clinical research organizations and clinical trial sites. We determine the estimates by reviewing contracts, vendor agreements and purchase orders and through discussions with internal clinical personnel and external service providers as to the progress or stage of completion of trials or services and the agreed-upon fee to be paid for such services.

We make estimates of accrued expenses as of each balance sheet date based on facts and circumstances known to us at that time. We periodically confirm the accuracy of our estimates with the service providers and make adjustments, if necessary. If the actual timing of the performance of services or the level of effort varies from the estimate, we will adjust the accrual accordingly. Nonrefundable advance payments for goods and services, including fees for process development or manufacturing and distribution of clinical supplies that will be used in future research and development activities, are deferred and recognized as expense in the period that the related goods are consumed or services are performed.

Although we do not expect our estimates to be materially different from amounts actually incurred, if our estimates of the status and timing of services performed differ from the actual status and timing of services performed, it could result in us reporting amounts that are too high or too low in any particular period. To date, there have been no material differences between our estimates of such expenses and the amounts actually incurred.

We measure and recognize compensation expense for all options based on the estimated fair value of the award on the grant date. Prior to our initial public offering, we used the Black-Scholes option-pricing model to estimate the fair value of option awards. The fair value is recognized as expense on a straight-line basis over the requisite service period.

The determination of the grant date fair value of options using an option pricing model is affected principally by our estimated fair value of shares of our common stock and requires management to make a number of other assumptions, including the expected life of the option, the volatility of the underlying shares, the risk-free interest rate and expected dividends. The assumptions used in our Black-Scholes option-pricing model represent management’s best estimates at the time of measurement. These estimates are complex, involve a number of variables, uncertainties and assumptions and the application of management’s judgment, as they are inherently subjective. If any assumptions change, our stock-based compensation expense could be materially different in the future.

Following our initial public offering, the closing sale price per share of our common stock as reported on the Nasdaq Global Market on the date of grant is used to determine the exercise price per share of our share-based awards to purchase common stock.

A description of recent accounting pronouncements that may potentially impact our financial position, results of operations or cash flows is disclosed in Note 2 to our unaudited condensed consolidated financial statements included elsewhere in this prospectus.

Results of Operations for the Three Months Ended September 30, 2019 and 2018

The following table sets forth our results of operations for the three months ended September 30, 2019 and 2018 (in thousands):

Research and development expenses were $12.2 million for the three months ended September 30, 2019, an increase of $12.2 million compared to the three months ended September 30, 2018. The increase was primarily due to $7.4 million for clinical trials and manufacturing expenses associated with maralixibat, $2.3 million of personnel and other compensation related expenses reflecting an increase in our number of employees, including stock-based compensation of $0.8 million, $1.3 million of consulting expenses associated with our clinical, manufacturing and regulatory activities, $0.8 million of non-clinical expenses and $0.4 million related to other general expenses.

General and administrative expenses were $3.7 million for the three months ended September 30, 2019, an increase of $3.6 million compared to the three months ended September 30, 2018. The increase was primarily

due to $2.2 million of personnel and other compensation related expenses reflecting an increase in our number of employees, including stock-based compensation of $1.3 million, $0.6 million of expenses associated with being a public company primarily related to increased costs of insurance, $0.5 million of professional and consulting services and $0.3 million of expenses related to other general expenses.

Interest income was $0.8 million for the three months ended September 30, 2019 and related to interest earned on our cash, cash equivalents and investments during the period.

Results of Operations for the Nine Months Ended September 30, 2019 and the Period from May 2, 2018 to September 30, 2018

The following table sets forth our results of operations for the nine months ended September 30, 2019 and the period from May 2, 2018 to September 30, 2018 (in thousands):

Research and development expenses were $28.6 million for the nine months ended September 30, 2019, an increase of $28.6 million compared to the period from May 2, 2018 to September 30, 2018. The increase was primarily due to $14.9 million for clinical trials and manufacturing expenses associated with maralixibat, $4.9 million of personnel and other compensation related expenses reflecting an increase in our number of employees, including stock-based compensation of $1.5 million, $3.0 million for development milestone expenses related to initiation of the Phase 3 MARCH-PFIC clinical trial, $2.9 million of consulting expenses associated with our clinical, manufacturing and regulatory activities, $1.3 million of non-clinical expenses, $1.2 million related to other general expenses and $0.4 million of expenses related to services performed under the TSA with Shire, which are not expected to recur.

General and administrative expenses were $7.5 million for the nine months ended September 30, 2019, an increase of $7.4 million compared to the period from May 2, 2018 to September 30, 2018. The increase was primarily due to $4.4 million of personnel and other compensation related expenses reflecting an increase in our number of employees, including stock-based compensation of $2.5 million, $0.7 million of general legal and patent expenses, $1.0 million of professional and consulting services, $0.6 million of expenses associated with being a public company primarily related to costs for insurance and $0.7 million of expenses related to other general expenses.

Interest income was $1.5 million for the nine months ended September 30, 2019, an increase of $1.5 million compared to the period from May 2, 2018 to September 30, 2018. The increase was primarily due to an increase in our cash, cash equivalents and investment balances through September 30, 2019 due to the completion of our initial public offering and sale of our Series A redeemable convertible preferred stock in April 2019.

The following table sets forth our results of operations for the period from May 2, 2018 to December 31, 2018 (in thousands):

Research and development expenses were $2.3 million for the period from May 2, 2018 to December 31, 2018 and were comprised primarily of $1.6 million expenses incurred for clinical trials and manufacturing activities assumed from Shire, $0.5 million of expenses related to services performed under the TSA, $0.1 million of consulting expenses and $0.1 million of compensation related expenses.

IPR&D expenses were approximately $14.5 million for the period from May 2, 2018 to December 31, 2018 relating to the acquisition to the rights to maralixibat and volixibat from Shire consisting of a $7.5 million upfront cash payment and $7.0 million for the fair value of the redeemable common stock issued to Shire.

General and administrative expenses were $0.6 million for the period from May 2, 2018 to December 31, 2018 and comprised primarily of $0.3 million of legal expenses relating to formation and corporate matters and $0.2 million in consulting and compensation related expenses.

At September 30, 2019, we had $153.6 million of cash, cash equivalents and investments compared to $52.0 million at December 31, 2018. To date, we have incurred operating losses and negative cash flows from operations. As of September 30, 2019, we had an accumulated deficit of $51.9 million. On July 22, 2019, we completed our initial public offering, pursuant to which we sold an aggregate of 5,000,000 shares of our common stock at a price of $15.00 per share, resulting in net proceeds of $67.2 million after deducting underwriting

discounts, commissions and offering expenses payable by us. We expect our existing cash, cash equivalents and investments will be sufficient to fund our operations for at least the next 12 months, and together with the net proceeds from this offering, will allow us to complete our ongoing Phase 3 clinical trial and planned NDA submission for maralixibat, our planned clinical trials for volixibat and initial commercial preparation activities for maralixibat.

We anticipate that we will continue to incur net losses for the foreseeable future as we continue research efforts and the development of our product candidates, initiate commercial preparation activities, hire additional staff, including clinical, scientific, operational, financial and management personnel, and continue to incur additional costs associated with being a public company.

Our primary use of cash is to fund operating expenses, which consist primarily of research and development expenditures, and to a lesser extent, general and administrative expenditures. Cash used to fund operating expenses is impacted by the timing of when we pay these expenses, as reflected in the change in our outstanding accounts payable and accrued expenses.

Through September 30, 2019, we have raised net cash proceeds of approximately $187.0 million primarily through equity financings, including the net proceeds from our initial public offering. Until such time, if ever, as we can generate substantial product revenue from sales of maralixibat, volixibat or any future product candidates, we expect to finance our cash needs through a combination of equity offerings, debt financings and potential collaboration, license or development agreements. To the extent that we raise additional capital through the sale of equity or convertible debt securities, ownership interest will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect rights as a 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 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 be required to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or to grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our drug development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Cash Flows for the Nine Months Ended September 30, 2019 and the Period from May 2, 2018 to September 30, 2018

The following table provides a summary of the net cash flow activity for the periods indicated (in thousands):

Net cash used in operating activities was $25.7 million for the nine months ended September 30, 2019, reflecting our net loss of $34.6 million partially offset by non-cash items of $4.0 million. Non-cash items

consisted primarily of $4.0 million in stock-based compensation, $0.2 million in depreciation and amortization of our operating lease right-of-use assets and fixed assets and $0.2 million of premium amortization on our investments. Additionally, cash used in operating activities reflected changes in net operating assets of $4.9 million, consisting of an $8.1 million increase in accounts payable, accrued expenses and other liabilities primarily due to clinical and manufacturing activities, a $3.0 million increase in prepaid expenses and other current assets consisting primarily of $1.8 million in prepayments for directors and officers insurance, $0.5 million in interest receivable and $0.7 million in prepaid research and development expenses representing increased operating activities over 2018, and a $0.1 million increase in other assets.

Net cash used in operating activities for the period from May 2, 2018 to September 30, 2018 were not significant.

Net cash used in investing activities was $122.6 million for the nine months ended September 30, 2019 primarily due to purchases of investments offset by maturities of investments.

There were no investing activities for the period from May 2, 2018 to September 30, 2018.

Net cash provided by financing activities was $127.2 million for the nine months ended September 30, 2019, primarily due to $67.2 million in net proceeds received from our initial public offering and $60.0 million in net proceeds from the issuance of 59,844,699 shares of Series A redeemable convertible preferred stock.

Net cash provided by financing activities was $0.1 million for the period from May 2, 2108 to September 30, 2018 consisting of proceeds from issuance of a convertible promissory note, which subsequently converted into shares of Series A redeemable convertible preferred stock and thereafter converted into shares of our common stock in connection with our initial public offering.

The following table provides a summary of the net cash flow activity for the period from May 2, 2018 to December 31, 2018 (in thousands):

Net cash used in operating activities was $0.4 million for the period from May 2, 2018 to December 31, 2018 which consisted primarily of our net loss of $17.3 million, reduced by in process research and development expense of $14.5 million and a $2.4 million decrease in the net assets due to an increase in accounts payable.

Net cash used in investing activities was $7.5 million for the period from May 2, 2018 to December 31, 2018 consisting of a $7.5 million upfront cash payment to Shire, as partial consideration for the rights granted to us under the Shire License Agreement.

Net cash provided by financing activities was $59.8 million for the period from May 2, 2018 to December 31, 2018 primarily consisted of net proceeds from issuance of 59,844,699 shares of Series A redeemable convertible preferred stock.

The following table summarizes our principal contractual obligations and commitments as of September 30, 2019 that will affect our future liquidity (in thousands):

From time to time we enter into certain types of contracts that contingently require us to indemnify parties against third-party claims, including the Shire License Agreement, and certain real estate leases, supply purchase agreements, and agreements with directors and officers. The terms of such obligations vary by contract and in most instances a maximum dollar amount is not explicitly stated therein. Generally, amounts under these contracts cannot be reasonably estimated until a specific claim is asserted, thus no liabilities have been recorded for these obligations on our consolidated balance sheet for the periods presented.

We enter into contracts in the normal course of business with clinical research organizations and clinical sites for the conduct of clinical trials, preclinical research studies, professional consultants for expert advice and other vendors for clinical supply manufacturing or other services. These contracts generally provide for termination on notice, and therefore are cancelable contracts.

Under the Shire License Agreement, as well as our other license and acquisition agreements, we have payment obligations that are contingent upon future events such as our achievement of specified development, regulatory and commercial milestones and are required to make royalty payments in connection with the sale of products developed under those agreements. In July 2019, we achieved the first development milestone under the Shire License Agreement and Satiogen License and made an aggregate payment of $3.0 million. As for the remaining milestones, as of September 30, 2019, we were unable to estimate the timing or likelihood of achieving future milestones or making future product sales and, therefore, any related payments are not included herein. For additional information regarding these license agreements, including our payment obligations thereunder, see Note 6 to our unaudited condensed consolidated financial statements.

We did not have during the periods presented, and we do not currently have any off-balance sheet arrangements, as defined in the rules and regulations of the SEC.

Our cash, cash equivalents and investments as of September 30, 2019 consist of readily available checking, money market funds, and investments. Our primary exposure to market risk is interest income sensitivity, which is affected by changes in the general level of U.S. interest rates. However, because of the short-term nature of the instruments in our portfolio, a sudden change in market interest rates would not be expected to have a material impact on our financial condition and/or results of operations. We do not believe that our cash, cash equivalents or investments have significant risk of default or illiquidity. While we believe our cash, cash equivalents and investments do not contain excessive risk, we cannot provide absolute assurance that in the future our investments will not be subject to adverse changes in market value. In addition, we maintain significant amounts of cash and cash equivalents at one financial institution that is in excess of federally insured limits.

Our operations include activities in the United States and Switzerland. In addition, we contract with vendors that are located outside of the United States and certain invoices are denominated in foreign currencies. While our operating results are exposed to changes in foreign currency exchange rates between the U.S. dollar and various foreign currencies, the most significant of which is the Swiss Franc, we do not currently believe that foreign currency could have a significant impact.

Inflation generally affects us by increasing our cost of labor and clinical trial costs. We do not believe that inflation and changing prices had a significant impact on our results of operations for any periods presented herein.

As an emerging growth company under the JOBS Act, we can take advantage of an extended transition period for complying with new or revised accounting standards. This allows an emerging growth company to delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. We have irrevocably elected not to avail ourselves of this exemption and, therefore, we will be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies. We intend to rely on other exemptions provided by the JOBS Act, including without limitation, not being required to comply with the auditor attestation requirements of Section 404(b) of the Sarbanes-Oxley Act.

We will remain an emerging growth company until the earliest of (i) December 31, 2024, (ii) the last day of the fiscal year in which we have total annual gross revenue of at least $1.07 billion, (iii) the last day of the fiscal year in which we are deemed to be a “large accelerated filer” as defined in Rule 12b-2 under the Exchange Act which would occur if the market value of our common stock held by non-affiliates exceeded $700.0 million as of the last business day of the second fiscal quarter of such year, or (iv) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the prior three-year period.

Our initial focus is on rare cholestatic liver diseases, including PFIC, ALGS, biliary atresia, or BA, primary sclerosing cholangitis, or PSC, and intrahepatic cholestasis of pregnancy, or ICP. Cholestasis is characterized by impaired flow of bile resulting in accumulation of toxic bile acids in the liver. This leads to liver injury, progressive liver disease and, if left untreated, can result in fibrosis, cirrhosis, liver failure and death. Approximately half of PFIC patients will need a transplant by the age of ten, and ALGS patients can have significantly reduced life expectancy. Patients with cholestatic liver disease typically experience debilitating pruritus, which dramatically impacts quality of life and can lead to scarring, sleep deprivation, significant fatigue and psycho-social effects. In some patients, intractable pruritus alone can justify liver transplantation. In ALGS, it has been reported that the majority of transplants are due to cholestatic symptoms. Other general manifestations of cholestatic liver diseases include jaundice, progressive liver disease and growth delay. Cholestatic liver diseases represent a significant unmet medical need, with no therapies approved by the U.S. Food and Drug Administration, or FDA, for treatment of the indications we are currently pursuing.

Following an end-of-Phase 2 meeting with the FDA in May 2019, we requested a meeting with the FDA to continue discussion of the adequacy of the current data set of maralixibat to support an NDA submission for the treatment of pruritus associated with ALGS. At the request of the FDA, we prepared various analyses of the maralixibat data set in the third quarter of 2019, in particular of the ICONIC clinical trial as the potential pivotal study. These analyses were submitted to the FDA in advance of the meeting we had in November 2019. In parallel, in October 2019, we received a breakthrough therapy designation for maralixibat for the treatment of pruritus associated with ALGS in patients one year of age and older.

Further, in November 2019, key clinical data for maralixibat were presented at the American Association for the Study of Liver Disease annual Liver Meeting for Phase 2 results in ALGS, PFIC, PSC and healthy volunteers. The ALGS presentation was a four year update on the ICONIC clinical trial showing persistent significant improvements from baseline in sBA, pruritus, xanthomas and growth in patients remaining on study at week 191.

Our team has strategically assembled a pipeline of novel product candidates that target a specific biological mechanism implicated in cholestatic liver diseases. We own exclusive worldwide rights to each of our product candidates. Maralixibat and volixibat are investigational, novel, oral, minimally-absorbed agents designed to inhibit the apical sodium-dependent bile acid transporter, or ASBT, which is primarily responsible for recycling bile acids from the intestine to the liver. The following table depicts each of our product candidates, the respective indications we are pursuing, the expected next milestones and regulatory designations:

Our lead product candidate, maralixibat, is a novel, oral, minimally-absorbed agent designed to selectively inhibit ASBT, also known as ileal bile acid transporter. ASBT is primarily responsible for recycling bile acids from the intestine back to the liver. ASBT inhibition results in more bile acids being excreted in the feces, leading to lower levels of bile acids systemically, thereby reducing bile acid mediated liver damage. Maralixibat possesses an extensive safety dataset, having been evaluated in more than 1,500 human subjects. Maralixibat has been studied in 33 pediatric patients with PFIC in the open-label Phase 2 INDIGO clinical trial. While the primary endpoint of change in sBA was not met in this study, multi-parameter responses were observed on pruritus, sBA, normalization of liver enzymes if abnormal at baseline and quality of life scores, in patients with nt-PFIC2, who are PFIC2 patients with a non-truncating mutation of the bile salt export pump, or BSEP. These data supported maralixibat’s breakthrough therapy designation for the treatment of PFIC2. A long-term analysis of the INDIGO clinical trial also showed an improvement in growth for those patients who had a response in sBA and pruritus. As of January 2019, 48 patients have received maralixibat for over three years across multiple

ongoing open-label extension clinical trials, and we have observed continued long-term benefits in these patients. We commenced enrollment in the Phase 3 MARCH clinical trial of maralixibat in PFIC in the second quarter of 2019 with a primary endpoint focused on pruritus associated with nt-PFIC2. In this Phase 3 clinical trial, we are exploring a higher dose of maralixibat (up to 600 µg/kg twice daily, or BID) compared with the INDIGO clinical trial (280 µg/kg daily, or QD). Patients have been dosed up to the equivalent of 700 µg/kg BID in previous safety trials. Although maralixibat may be eligible, as a breakthrough therapy, for priority review and accelerated approval by the FDA, breakthrough therapy designation may not lead to a faster development, regulatory review or approval process, and it does not increase the likelihood that maralixibat will receive marketing approval.

We are advancing maralixibat for the treatment of PFIC in the Phase 3 MARCH trial. PFIC affects approximately 8,000 people in the United States and Europe and is typically diagnosed within the first three to six months of life. Currently, there are no approved therapeutics for the treatment of PFIC. Partial external biliary diversion surgery, or PEBD, is associated with significant complications, and liver transplantation is the only definitive treatment but is expensive, requires life-long administration of immuno-suppressants and has potential for significant comorbidities. Only a portion of the patients who require a liver transplant are able to match with a suitable donor organ, and there can be serious complications, for example, rapid re-occurrence of disease and steatosis. Our initial focus is on patients with non-truncating BSEP deficiency.

In the Phase 2 INDIGO clinical trial, a multi-parameter response on pruritus, serum bile acids, or sBA, and growth was observed in patients with PFIC2, a genetically distinct subtype of PFIC that accounts for approximately 60% of the PFIC patient population. Specifically, the multiparameter response was seen in patients with nt-PFIC2. At week 48, 55% of the PFIC2 patients treated with maralixibat experienced a clinically meaningful reduction in pruritus, defined as a reduction of at least 1.0 point in the ItchRO(Obs) score. The ItchRO(Obs) score is a caregiver-reported outcome assessment developed for use in cholestatic liver diseases, which measures severity of itch on a 0-4 scale. In addition, patients treated with maralixibat experienced normalization or significant reductions in sBA levels from baseline, increases in quality of life and, in those patients with elevated baseline values, a normalization of alanine aminotransferase, or ALT, and bilirubin levels. This multi-parameter response supported maralixibat’s breakthrough therapy designation from the FDA for the treatment of PFIC2. The disease-modifying potential of maralixibat is further supported by data from a long-term analysis of the INDIGO clinical trial, which showed an improvement in growth for those patients who experienced significant improvements in sBA levels and pruritus. Maralixibat has been granted orphan drug designation for PFIC by the FDA and the European Medicines Agency, or EMA. We commenced enrollment in the Phase 3 MARCH trial in the second quarter of 2019 with a primary endpoint focused on pruritus in patients with nt-PFIC2, and we expect to complete enrollment in the second quarter of 2020 and report topline Phase 3 data in late-2020.

ALGS is a multi-organ disease that affects approximately 23,000 people in the United States and Europe, and patients are typically diagnosed in infancy. Similar to PFIC, there are no approved therapies for the treatment of ALGS. PEBD is associated with significant complications, and liver transplantation is the only definitive treatment for patients with ALGS, but is expensive, requires long-term administration of immuno-suppressants, and only a portion of the patients who require a liver transplant are able to match with a suitable donor organ or can tolerate the surgery.

In the Phase 2b ICONIC clinical trial with a placebo-controlled drug withdrawal period, there was a statistically significant difference in pruritus between the treatment group and placebo group as measured by ItchRO(Obs) score (p<0.0001). Additionally, at week 48 as compared to baseline, 72% of patients had a clinically meaningful reduction in the ItchRO(Obs) score (p<0.0001); mean sBA were reduced by 36% (p<0.01); xanthomas, deposits of cholesterol under the skin, were decreased by 44% (p<0.01), as measured by the Clinician Xanthoma Scale; and quality of life scores improved by a mean of 9.5 points. Maralixibat has been granted

orphan drug designation for ALGS by the FDA and EMA and breakthrough designation for the treatment of pruritus associated with ALGS in patients one year of age and older by the FDA.

We are planning to initiate a rolling submission of an NDA for the treatment of pruritus associated with ALGS beginning in the third quarter of 2020.

We also plan to advance maralixibat for the treatment of BA in a clinical program based on its mechanism, the high unmet medical need, maralixibat clinical experience in other cholestatic liver disease settings and results from a nonclinical efficacy model. Prior to initiation, we intend to discuss the design and scope of our planned clinical program for maralixibat in BA with regulatory authorities. As we have not tested maralixibat in subjects with BA or subjects less than 12 months old, regulatory authorities may require us to conduct a Phase 2 clinical trial and/or additional clinical development activities before we are able to conduct a Phase 3 clinical trial.

BA is a rare liver disorder in which there is a blockage or absence of large bile ducts that leads to bile accumulation in the liver and ultimately results in progressive cholestasis and liver damage. BA occurs in infants and is estimated to affect one in every 10,000 to 15,000 live births in the United States. BA is the most common reason for liver transplantation in children. There remains a substantial unmet medical need for therapeutic interventions as invasive surgery is often unsuccessful. The standard of care for BA is the Kasai procedure, a surgery in which a segment of the small intestine is used to attach the small intestine directly to the liver where bile is expected to drain and is most successful if conducted in the first eight weeks of life. The success rate for the Kasai procedure is approximately 30% to 40%, while the remaining patients are at risk of progressive liver disease requiring liver transplantation. We believe ASBT inhibition has therapeutic potential in this patient population, and our clinical development pathway will be informed by further discussions with the FDA regarding our clinical trial design for BA.

We are advancing our second product candidate, volixibat, a novel, oral, minimally-absorbed agent designed to inhibit ASBT, for the treatment of adult patients with cholestatic liver diseases. We intend to initially develop volixibat for the treatment of PSC and ICP. PSC is a serious, idiopathic chronic cholestatic liver disease characterized by the progressive inflammation and destruction of bile ducts, which can lead to life-threatening complications. It is estimated that approximately 29,000 people in the United States and approximately 50,000 people in Europe suffer from PSC. Up to 70% of PSC patients suffer from pruritus during the course of the disease. Liver transplantation is the only treatment shown to improve clinical outcomes in PSC but is expensive, requires long-term administration of immuno-suppressants and only a portion of the patients who require a liver transplant are able to match with a suitable donor organ. Ursodeoxycholic acid, or UDCA, is used off-label in PSC but has been shown to be minimally effective. ICP is typically diagnosed in pregnant women during the second or third trimester and increases the risk of stillbirth and preterm labor. Additionally, ICP is associated with severe pruritus. We estimate that each year there are approximately 40,000 cases of ICP in the United States and approximately 100,000 cases of ICP in Europe. There are no approved therapies for PSC or ICP in the United States.

Volixibat has been extensively studied in adults, with data from several clinical trials showing target engagement. Previously conducted clinical trials have shown that volixibat increased bile acid excretion and positively affected related bile acid measures. In a Phase 2 clinical trial in NASH, volixibat-treated patients showed reductions in cholesterol levels and increases in C4 levels, a marker of bile synthesis, which are indicative of ASBT inhibition. Proof-of-concept data from a Phase 2 clinical trial of maralixibat in PSC provides evidence of the benefits of ASBT inhibition. In the Phase 2 CAMEO trial in PSC patients, treatment with maralixibat resulted in a statistically significant reduction from baseline in ItchRO score and sBA levels. We are conducting a Phase 1 dose ranging bile acid excretion study to determine dose levels for our planned efficacy studies. We expect to initiate clinical trials of volixibat in PSC and ICP in 2020.

Our mission is to develop life-changing therapies for patients suffering from debilitating liver diseases. Our management team has significant experience in progressing liver and orphan diseases therapies from early stage research to clinical trials and ultimately to regulatory approval and commercialization. Michael Grey, our co-founder and Chairman of our board of directors, was the Chief Executive Officer of Lumena Pharmaceuticals, Inc., or Lumena, where he led the development of maralixibat and volixibat prior to Lumena’s acquisition by Shire plc in June 2014. Christopher Peetz, our President, Chief Executive Officer and co-founder, as well as several other members of our management team, previously held leadership positions at Tobira Therapeutics, Inc., or Tobira, a liver disease company, prior to its acquisition by Allergan plc in November 2016. As part of our strategy to acquire and advance therapeutic candidates for debilitating liver diseases, we acquired maralixibat and volixibat in November 2018 from Shire plc and are continuing to advance these product candidates for rare cholestatic liver diseases with the assistance of key program leaders from Shire plc who joined us following the acquisition.

Our goal is to be a leader in the treatment of liver diseases for which the unmet medical need is high. The key components of our strategy include:

In patients with cholestatic liver diseases, the flow of bile from the liver is impaired. Accumulation of bile acids in the liver leads to liver injury, progressive liver disease and, if left untreated, results in fibrosis, cirrhosis, liver failure and death. Patients often experience debilitating pruritus, which dramatically impacts quality of life and can lead to scarring, sleep deprivation, significant fatigue and psycho-social effects. In some patients, intractable pruritus can be severe enough to be an indication for liver transplantation. Caregivers, particularly parents of children with cholestatic liver diseases, also suffer from impaired sleep and anxiety as they struggle to help their loved ones manage this debilitating symptom. Other general manifestations of cholestatic liver diseases include jaundice, progressive liver disease and growth delay.

PFIC is a rare genetic disorder that causes progressive liver disease, which typically leads to liver failure. The disease is inherited in an autosomal recessive pattern, meaning mutations in both copies of the gene are necessary to cause the disorder. The disease is estimated to affect one in every 50,000 to 100,000 births in the United States and Europe, and we estimate that there are approximately 3,000 patients with PFIC in the United States and approximately 5,000 in Europe. We believe the initial addressable patient population in the United States is approximately 500-750 PFIC2 children with nt-PFIC2.

In patients with PFIC, liver cells have a diminished ability to secrete bile due to mutations in proteins that control bile flow. The resulting buildup of bile in liver cells causes liver damage in affected individuals. Six types of PFIC have been genetically identified, all of which are similarly characterized by impaired bile flow and progressive liver disease. Our initial focus is on the PFIC2 patient population, which accounts for approximately 60% of the PFIC patient population. PFIC2 is caused by a mutation in the ABCB11 gene, which normally encodes a BSEP protein that transports bile acids out of the liver. Mutations in the ABCB11 gene result in the buildup of bile salts in liver cells, damaging these cells and causing liver disease. Specifically, we are focusing on patients with non-truncating BSEP deficiency, whom we estimate account for approximately 85% of the PFIC2 patient population.

Signs and symptoms of PFIC typically begin in infancy and are related to buildup of toxic bile acid in the liver. Patients with PFIC experience pruritus, jaundice, failure to gain weight and to grow at the expected rate, enlarged livers and spleens and progressive liver disease. Elevation of sBA is a common feature of the disease. Children with PFIC2 often develop liver failure within the first few years of life and have an increased risk of developing liver cancer. The most prominent and troublesome ongoing symptom of PFIC is severe pruritus, leading to a greatly diminished quality of life.

There remains a substantial unmet medical need for therapeutic options for PFIC, as PEBD and liver transplantation are often the sole options available for patients. Children with nt-PFIC2 are our initial target patient population for treatment with maralixibat. We believe the opportunity exists to broaden beyond this initial patient population, and we plan to evaluate the effectiveness of maralixibat in patients with other types of PFIC, such as PFIC1 and PFIC3, in a supplemental cohort in our Phase 3 MARCH trial.

Benign recurrent intrahepatic cholestasis, or BRIC, consists of two types, BRIC1 and BRIC2, which have the same underlying genetic mutations as PFIC1 and PFIC2, respectively. BRIC is characterized by intermittent episodes of cholestasis with pruritus. This condition is called benign because it typically does not cause lasting damage to the liver, but it can develop into a more severe, permanent form. There are no approved therapies for BRIC, but patients can achieve temporary relief of the severe pruritus by lowering bile acid levels through procedures such as naso-biliary drainage. We believe there is therapeutic potential for an ASBT inhibitor, or ASBTi, for the treatment of pruritus associated with BRIC.

incidence of ALGS is one in every 30,000 to 50,000 births in the United States and Europe, and we estimate that there are approximately 9,000 patients with ALGS in the United States and approximately 14,000 in Europe. We believe the initial addressable patient population in the United States will be a subset of these patients, comprising approximately 2,000-2,500 pediatric ALGS patients.

In patients with ALGS, multiple organ systems may be affected by the mutation, including the liver, heart, kidneys and central nervous system. The accumulation of bile acids prevents the liver from working properly to eliminate waste from the bloodstream and leads to progressive liver disease. Signs and symptoms arising from cholestasis in ALGS may include jaundice, pruritus and xanthomas. The pruritus experienced by patients with ALGS is among the most severe in any chronic liver disease and is present in most affected children by the third year of life. The progressive liver damage, pruritus, xanthomas or quality of life impacts lead to liver transplant in up to 44% of children with ALGS. In patients who do not receive a liver transplant, 75% have active scratching, with 32% having destruction of skin, bleeding or scarring. Children with ALGS experience a markedly impaired quality of life largely due to the intense pruritus and associated skin lesions and disruptions in sleep and mood. A study to assess the health-related quality of life in ALGS patients indicated a significant burden in physical, psychological and social health accompanies the disease.

There remains a substantial unmet medical need for therapeutic options for ALGS, as PEBD and liver transplantation are the only options available for these patients.

The underlying causes of BA are not completely understood. For some patients, BA may occur because the bile ducts did not form properly during fetal development and in others, inflammation around the time of birth leads to destruction of bile ducts. As a result of BA, bile acids are not able to adequately drain from the liver, resulting in an array of signs and symptoms shortly after birth, including jaundice, dark urine and enlarged liver. The rapid progression of BA necessitates surgical intervention within the first months of life.

There remains a substantial unmet medical need for therapeutic interventions, as invasive surgery is often unsuccessful. The standard of care for BA is the Kasai procedure, a surgery in which a segment of the small intestine is used to attach the small intestine directly to the liver where bile is expected to drain and is most successful if conducted in the first eight weeks of life. The success rate of the Kasai procedure is approximately 30% to 40%. The remaining patients are at risk of progressive liver disease requiring liver transplantation. We believe ASBT inhibition has therapeutic potential in this patient population.

PSC is a rare, serious, idiopathic chronic cholestatic liver disease characterized by progressive inflammation and destruction of bile ducts, which may lead to fibrosis, cirrhosis, portal hypertension, cancer and ultimately liver failure. It is estimated that approximately 29,000 people in the United States and approximately 50,000 people in Europe suffer from PSC.

The underlying cause of PSC is not completely understood, but it is thought to arise from a combination of genetic and environmental factors. There is evidence that variations in certain genes involved in immune function increase the risk of developing PSC. The median age at diagnosis is approximately 35 years and approximately 70% of PSC patients have inflammatory bowel disease, principally ulcerative colitis.

The earliest symptoms of PSC include extreme fatigue, abdominal discomfort and pruritus. Up to 70% of PSC patients suffer from pruritus during the course of the disease. As the condition worsens, patients may develop jaundice and enlarged spleens. Eventually, the buildup of bile damages liver cells and contributes to progression of the disease from chronic liver disease to subsequent liver failure. Median transplant-free survival for PSC patients is estimated to be nine to 18 years from diagnosis in symptomatic patients, depending upon the stage of the disease at the time of diagnosis. Complications involving the biliary tree are common and include cholangitis, as well as ductal strictures and gallstones, both of which may require frequent endoscopic or surgical interventions. PSC increases the risk of development of malignancies, with cholangiocarcinoma, a group of cancers that begin in the bile ducts, being the most common.

There is an acute need for novel therapeutic interventions in PSC as liver transplantation is currently the only known treatment shown to improve clinical outcomes. UDCA is often used off-label for the treatment of PSC but does not offer improvement in pruritus, one of the most debilitating symptoms associated with the disease. PSC is the fifth leading indication for liver transplantation; however, the post-transplant recurrence rate of PSC is as high as 25%. We believe an ASBTi offers a substantial opportunity to address many of the symptoms and associated complications of PSC, as well as potentially delay or eliminate the need for liver transplantation.

ICP is a liver disorder that occurs in pregnant women, often during the third trimester, which impairs the normal release of bile from liver cells and leads to impaired liver function. We estimate that each year there are approximately 40,000 cases of ICP in the United States and approximately 100,000 cases of ICP in Europe. ICP can contribute to serious complications, including preterm labor and stillbirth.

The underlying cause of ICP is not completely understood, but it is thought that the increase in pregnancy hormones during the second and third trimesters impairs liver function and the flow of bile. Also, some women have a genetic profile similar to that seen in PFIC. The disease can result in intense pruritus, typically of the hands and feet. It resolves rapidly following birth but can cause serious complications for childbirth, including meconium-stained amniotic fluid, preterm labor, neo-natal asphyxia and stillbirth. The rates of these events increase with increasing levels of maternal sBA. Induction of early delivery, i.e. before 36 gestational weeks, is an option for high risk pregnancies but bear the risk of long-term consequences for the child.

Due to the acute nature of the disease and potential for complications during pregnancy, there remains an unmet medical need for a safe and effective treatment option for ICP. There is no approved therapy for ICP in the United States, but UDCA is used off-label to decrease the concentration of harmful bile acids. However, reports suggest that UDCA offers minimal improvement for patients. Therefore, patients with ICP may benefit from treatment with an ASBTi.

Cholestatic liver diseases are driven by increased levels of bile acids. As depicted in the figure below, inhibiting ASBT results in more bile acids being excreted in the feces, leading to lower levels of bile acids systemically and thereby reducing bile acid mediated liver damage. This leads to improvements in liver function, pruritus and other symptoms of cholestatic liver diseases.

Our lead product candidate, maralixibat, is a novel, oral, minimally-absorbed agent designed to selectively inhibit ASBT. Maralixibat possesses an extensive safety dataset, having been evaluated in more than 1,500 human subjects. Maralixibat has been studied in 33 pediatric patients with PFIC in one open-label Phase 2 clinical trial. Results from the Phase 2 INDIGO clinical trial of maralixibat in PFIC showed multi-parameter response in patients with nt-PFIC2 on pruritus, sBA, normalization of liver enzymes if abnormal at baseline and quality of life scores, which was the basis for maralixibat’s breakthrough therapy designation for the treatment of PFIC2. While the primary endpoint of sBA change from baseline to week 13 did not reach statistical significance for the overall group, the pre-specified 48-week analysis of the study demonstrated a profound treatment response in a subset of PFIC2 patients. A long-term analysis of the INDIGO clinical trial showed an improvement in growth for those patients who had a response in sBA and pruritus. We commenced enrollment in the Phase 3 MARCH clinical trial of maralixibat in PFIC in the second quarter of 2019, with a primary endpoint focused on pruritus in patients with nt-PFIC2.

Maralixibat has been studied in 86 pediatric patients with ALGS across five Phase 2 clinical trials, including three placebo-controlled clinical trials. The first two ALGS clinical trials of maralixibat, at low doses, showed signs of activity; however, their primary endpoints were not met. In the Phase 2b ICONIC clinical trial of maralixibat in ALGS, patients taking maralixibat had statistically significant reductions in pruritus and sBA compared to placebo. At the 48-week measurement, pruritus and sBA reductions were maintained and improvements in xanthomas and quality of life were also observed.

We are planning to pursue full approval for the indication of pruritus associated with ALGS based on feedback from the FDA and the results from the ICONIC study of maralixibat in children with ALGS. As a result of discussions with the FDA, we are planning a rolling NDA submission, which will be initiated in the third quarter of 2020, and are planning to submit the CMC data section in the first quarter of 2021.

The table below summarizes the key objectives and observations of our clinical trials of pediatric patients.

In the description of our trials above and elsewhere in this prospectus, n represents the number of patients in a particular group and p or p-values represent the probability that random chance caused the result (e.g., a p-value of 0.001 means that there is a 0.1% probability that the difference between the placebo group and the treatment group is purely due to random chance). A p-value of less than or equal to 0.05 is a commonly used criterion for statistical significance, and may be supportive of a finding of efficacy by regulatory authorities.

The Phase 2 INDIGO clinical trial is an ongoing, long-term, open-label trial designed to evaluate the safety and efficacy of maralixibat in 25 pediatric patients with PFIC2 and eight pediatric patients with PFIC1. INDIGO evaluated measures of sBA and pruritus at various time points. The primary endpoint of the change from baseline to week 13 in fasting sBA level did not reach statistical significance for the overall group, but profound and durable reductions in sBA were seen in patients with PFIC2 at 48 weeks and maintained through at least 72 weeks. The secondary endpoint of a reduction from baseline to week 13 in pruritus as measured by the ItchRO(Obs) scale did reach statistical significance for the overall group. Moreover, in the 48-week analysis, 55% of PFIC2 patients had a clinically meaningful pruritus reduction as measured by the ItchRO(Obs) scale. Patients are currently being followed in a long-term extension of the trial. Maralixibat has been administered to 22 patients for at least 72 weeks at doses up to 280 µg/kg daily QD. Patients without response or with partial treatment response could escalate to 280 µg/kg BID.

The responses observed in the PFIC2 patient group provided the basis for breakthrough therapy designation for the treatment of PFIC2 patients. At the 48-week time point, maralixibat treatment in PFIC2 responders led to normalization (£8.5 µmol/L) or significant reduction (>70%) in sBA levels from baseline and disappearance of

pruritus (³1.0 point reduction from baseline on the ItchRO(Obs) scale). This pattern of improvement has not been observed in the natural history of the disease. These responders have been treated for approximately four years in INDIGO and have maintained the above response pattern throughout, except during transient episodes of intercurrent illnesses (e.g., gastroenteritis or upper respiratory tract infections).

An analysis of PFIC2 patients with complete absence of BSEP function, that is, patients with a truncating mutation in the PFIC2 gene, or truncating PFIC2, showed that these patients were unlikely to respond to treatment, whereas those patients with residual BSEP function, that is, patients with nt-PFIC2 had the greatest reductions in both sBA and pruritus. The charts below show the sBA response profiles for the patients with nt-PFIC2, truncating PFIC2 and PFIC1 and the robust and durable pruritus response in the patients with nt-PFIC2.

Note: The black filled circles refer to termination. The black empty circles refer to the start of BID dosing.

A long-term analysis of these responders showed a sustained growth benefit. This difference was statistically significant at every timepoint after six months of treatment and reached clinically relevant z-score differences of up to 1.20 and 0.75 for height and weight, respectively, at the end of the 72-week analysis period. A z-score represents the number of standard deviations between the mean and a given data point.

Change from baseline in height z-scores for the 25 INDIGO clinical trial participants with PFIC2, of which six were responders in this analysis

Note: Based on n=6 responders and n=19 non-responders. Increased variability at weeks 48-72 reflects the fact that not all patients had progressed that far in the clinical trials at the time the data was analyzed; despite this, differences at weeks 24, 36, 48, 60, and 72 reached statistical significance. In patients with a negative baseline z-score, a positive change from baseline means “catch-up growth” and a negative change from baseline means further growth delay, i.e., height difference compared to the normal population decreases and increases, respectively.

The observed improvements in growth represented a durable effect. Furthermore, a seventh treatment responder achieved the above treatment response criteria, similar to the six patients represented above, after BID dose increase. As shown in the chart below, this seventh responder exhibited similar growth benefits after this dose escalation. Collectively, this evidence suggests that lowering sBA with maralixibat may lead to improved outcomes, including growth and pruritus.

Change in height and weight z-scores for the seventh responder to maralixibat treatment

The multicenter Phase 2b ICONIC clinical trial has a four-week double-blind, randomized, placebo-controlled drug withdrawal period with the following design:

The ICONIC clinical trial enrolled 31 ALGS patients with sBA greater than three times the upper limit of normal and moderate to severe pruritus and includes an open-label extension period and is currently ongoing after approximately four years. In a 48-week analysis, the ICONIC clinical trial met its primary endpoint of a mean change in sBA between placebo and maralixibat during the randomized drug withdrawal period in responders, as defined in the graph below. A statistically significant difference in sBA was observed between the treatment groups (p<0.05).

Change in sBA during the randomized drug withdrawal period in sBA responders (responders defined as ³50% reduction in sBA at week 12 or 18)

The ICONIC trial demonstrated statistical significance on efficacy measures at multiple timepoints. In addition to the primary endpoint, the 48-week analysis of the ICONIC clinical trial evaluated measures of pruritus, sBA and xanthomas.

As depicted in the figure below, patients treated with maralixibat experienced an approximately 60% mean reduction from baseline to week 18 in pruritus, as measured by ItchRO(Obs) score (p<0.0001). The predefined 48-week analysis to assess changes in pruritus during the randomized drug withdrawal period showed that patients who were randomized to placebo experienced a recurrence of their pruritus, whereas those who continued on maralixibat maintained their reduction in pruritus (p<0.0001). After the randomized drug withdrawal phase during which placebo patients received maralixibat for a second time, a decrease in ItchRO(Obs) score similar to those who had received continuous maralixibat treatment was observed. The results during the randomized drug withdrawal period demonstrate a treatment effect with maralixibat. Pruritus improvements were maintained through week 48 and were statistically significant as compared to baseline (p<0.0001).

Observer-reported pruritus severity ItchRO(Obs) weekly average morning score change from baseline

The figures below further depict the observer reported pruritus severity weekly average morning score change from baseline by patient in the group that stayed on maralixibat for the entire trial period and the placebo-controlled withdrawal group.

Observer-reported pruritus severity ItchRO(Obs) weekly average morning score change from baseline in MRX-MRX-MRX group

Observer-reported pruritus severity ItchRO(Obs) weekly average morning score change from baseline in MRX-PBO-MRX group

The ICONIC trial 48-week analysis evaluated additional measures of pruritus to further characterize the potential treatment effects of maralixibat. The clinician scratch score, or CSS, is a measure of itch evaluated by the treating physician. The CSS uses a scale of 0-4 in which 0=none, 1=rubbing or scratching, 2=active scratching without evident skin abrasions, 3=abrasions evident and 4=cutaneous mutilation, hemorrhage and

scarring. Results were consistent with the pruritus ItchRO(Obs) results during both the blinded drug withdrawal period and at the end of the 48-week observation period. The proportion of patients with the maximum CSS score of 4 decreased from 51.6% at baseline to 6.9% at week 18 and remained stable at 7.1% at week 48. The results are shown below and provide further evidence of a treatment effect with maralixibat.

The ICONIC trial 48-week analysis further evaluated sBA changes as a measure of the bile acid reduction activity of maralixibat. As depicted in the figure below, at week 18, patients treated with maralixibat experienced an approximately 31% mean reduction from baseline in sBA levels in the overall study population. During the randomized withdrawal period, patients treated with placebo experienced a significant increase in sBA levels to near baseline levels, whereas patients who continued on maralixibat maintained their reduction in sBA levels at week 22 (p<0.05). After the randomized drug withdrawal phase, placebo patients received maralixibat for a second time. At week 48, placebo patients experienced a 36% mean sBA reduction compared to sBA levels at week 22.

The ICONIC trial 48-week analysis also evaluated xanthomas on the Clinician Xanthoma Scale, which uses a 5-point scale that ranges from 0 (none) to 4 (disabling). Xanthomas are cholesterol deposits underneath the skin that occur as a result of retained bile acids and cholesterol in some ALGS patients and can be very disfiguring and debilitating. The chart below shows the change over time in the mean xanthoma score in patients in the ICONIC clinical trial. As depicted in the figure below, maralixibat led to a mean reduction of 44% in xanthoma score at week 48 as compared to baseline (p<0.01). Additionally, of the patients who had xanthomas at baseline, 43% had no xanthomas at week 48.

At the American Association for the Study of Liver Diseases (AASLD) meeting in November 2019, additional data from the long-term extension of the Phase 2b ICONIC study were presented regarding the durability of treatment effect on cholestasis and cholestatic symptoms of maralixibat in children with ALGS. At the conclusion of the 48-week treatment period of the placebo-controlled Phase 2b ICONIC study of maralixibat in children with ALGS, 23 participants entered into the long-term extension. At the time of this new analysis, 15 participants remained on study with a duration of up to four years. The chart below shows how, consistent with results reported after 48 weeks of treatment with maralixibat, reductions in sBA and pruritus were statistically significant and further improved in the participants who remained on maralixibat through 191 weeks of treatment compared to baseline (p<0.005 and p<0.0001, respectively).

Significant and sustained improvements in pruritus with long-term maralixibat treatment

In addition, clinician scratch scale scores (p<0.0001) and xanthomas (p<0.05) remained significantly reduced compared to baseline with long-term treatment. Improvements were also seen in the PedsQL Multidimensional Fatigue Scale score (p<0.01). As depicted in the figure below, children taking maralixibat exhibited a clinically meaningful and statistically significant acceleration in height growth as measured by height z-score (p£0.01). Maralixibat was generally well tolerated at doses of up to 800 µg/kg day.

Two additional clinical trials have been conducted for maralixibat for the treatment of ALGS and associated long-term extension clinical trials are ongoing. These clinical trials included dose-ranging randomized assessments of maralixibat compared to placebo at week 13 on measures of sBA and pruritus. All of the dose levels of maralixibat evaluated in the randomized comparison were lower than those used in the ICONIC clinical trial. We believe the dose of 400 µg/kg used in the ICONIC clinical trial has the potential for stronger therapeutic activity on pruritus than the lower doses evaluated in these clinical trials. The table below summarizes the pruritus results from the Phase 2 ITCH and IMAGO clinical trials of maralixibat in ALGS.

Long-term analysis from IMAGINE, the extension of the IMAGO clinical trial, showed that despite there not being a significant difference from placebo at week 13, pruritus relief sustained over the long-term open label treatment with maralixibat. The long-term results of pruritus from the IMAGINE clinical trial are summarized in the chart below.

We believe that the statistically significant treatment effect observed with maralixibat treatment on sBA as well as the statistically significant difference on pruritus measures observed in the ICONIC clinical trial represent a clinically meaningful benefit for patients with ALGS. Based on these data, in May 2019, we had an end-of-Phase 2 meeting with the FDA to discuss the adequacy of the current data set of maralixibat to support an NDA submission for the treatment of pruritus associated with ALGS. At the request of the FDA, we prepared various analyses of the maralixibat data set, in particular the ICONIC clinical trial as the potential pivotal study, and requested an additional meeting with the FDA.

In the third quarter of 2019, we performed a number of analyses and profiling of response. These analyses were submitted to the FDA in advance of the meeting we had in November 2019. In parallel, in October 2019, we received a breakthrough therapy designation for maralixibat for the treatment of pruritus associated with ALGS in patients one year of age and older.

In October 2019, the FDA requested that we convert the meeting to a pre-NDA meeting and discuss the components and timeline of an NDA submission. During this meeting, we and the FDA reached consensus on a timeline for initiating a rolling submission of an NDA in the third quarter of 2020 and the details of various routine datasets to generate for the submission. We also met with the FDA to discuss CMC plans and our commercial supply chain strategy. We have initiated production of registration batches, and believe we will be in a position to provide the stability data required for NDA submission by the first quarter of 2021. Through the FDA interactions, we have an agreed plan for the components and timing of a rolling NDA. We expect the NDA submission to be complete in the first quarter of 2021, which will include the submission of the FDA requested CMC and stability data.

CLARITY was a 13-week, randomized, double-blind, placebo-controlled, multi-center trial, to evaluate maralixibat in primary biliary cholangitis, or PBC, patients with pruritus who had inadequate response to UDCA.

A significant decrease from baseline in pruritus scores at week 13 was observed in both the treatment and placebo groups, with no significant difference between the groups. However, there was a statistically significant decrease in sBA in maralixibat treated patients compared to placebo (p<0.05).

CAMEO was a 14-week open-label clinical trial to evaluate the safety, tolerability and efficacy of maralixibat in 27 patients with PSC. The primary efficacy endpoint of a change from baseline in the fasting sBA level at week 14 showed a 38% reduction (p<0.01). The clinical trial also showed a significant reduction in pruritus of 51% in the overall treatment group (p<0.05). We believe these data support further development of an ASBTi for PSC pruritus and plan to evaluate volixibat for PSC pruritus.

Prior to the cholestatic liver disease program, maralixibat was evaluated as a treatment for elevated cholesterol levels in a clinical development program in which over 1,400 subjects received maralixibat. In this program, maralixibat was generally well-tolerated and showed reductions in low-density lipoprotein, or LDL, cholesterol, as well as a consistent tolerability and safety profile.

Maralixibat was generally well tolerated at all doses tested. The maralixibat safety database includes 33 pediatric patients with PFIC and 86 pediatric patients with ALGS who have been treated with maralixibat for up to approximately four years, as well as over 1,400 adult subjects from previous studies including healthy subjects and patients with PSC, PBC and hypercholesterolemia.

The most commonly reported adverse events, or AEs, and serious adverse events, or SAEs, have been those of gastrointestinal, or GI, disorders such as diarrhea, abdominal pain and vomiting, and were mostly mild to moderate in severity and transient in nature. Reported treatment-related SAEs have consisted of abdominal pain, upper abdominal pain, diarrhea, cholangitis, increase in blood bilirubin, increase in international normalized ratio, increase in pancreatitis, ALT, autoimmune hepatitis, hematochezia, pure red cell aplasia, myelodysplastic syndrome and anemia. The frequency of observed AEs and SAEs has not increased over time. In patients who have been on drug for up to approximately four years, maralixibat has not shown any long-term safety signals at doses up to 400 µg/kg BID. No deaths have been reported.

The natural history of the underlying cholestatic liver disease in patients with PFIC and ALGS is characterized by frequent abnormalities in liver-related blood test, especially bilirubin and transaminases, such as ALT, but sometimes without obvious clinical explanations. A systematic review of all liver parameters across the pediatric maralixibat studies was conducted and included an adjudication of selected cases by independent pediatric cholestasis experts. During this review the only noted changes were isolated, asymptomatic ALT increases in some ALGS patients and 1.7% were assessed as probably related to drug treatment. We believe these are due to secondary or compensatory mechanisms in line with published literature of transaminase increase after PEBD and the minimally absorbed nature of maralixibat. None of the events were serious or resulted in liver-related mortality or morbidity. No PFIC patients reviewed had developed liver abnormalities resulting from drug treatment.

Based on the responses seen in the INDIGO clinical trial and the extensive safety data, we are conducting the Phase 3 MARCH clinical trial, a randomized, placebo-controlled clinical trial of maralixibat in PFIC. As depicted in the figure below, the clinical trial is evaluating maralixibat at a dose of up to 600 µg/kg BID compared to placebo for six months followed by a long-term open label extension in which all patients will receive maralixibat. The primary endpoint is a reduction in severity of pruritus as measured by the ItchRO(Obs) scale and will include up to 30 patients with nt-PFIC2 aged one to 17 years. Other PFIC patients who do not meet

the inclusion criteria for the primary cohort but otherwise meet eligibility criteria will be enrolled in a supplemental cohort. We are also evaluating a number of secondary and additional endpoints to support maralixibat’s effect on the underlying disease. These additional endpoints include the mean change in itch frequency, the mean change in sBA, mean change in quality of life as measured by the PedsQL and the proportion of patients who experience an improvement from baseline in height z-score. We expect to report topline data from the Phase 3 MARCH clinical trial in late-2020. The data from our Phase 3 MARCH clinical trial, if positive, together with natural history data set comparisons and the data from the Phase 2 INDIGO clinical trial, will form the basis for our planned NDA submission to the FDA for maralixibat in PFIC.

Based on the data from our ALGS clinical trials, we are planning to initiate a rolling submission of an NDA for the treatment of pruritus associated with ALGS in the third quarter of 2020. In addition, we plan to further discuss our submission plans with the EMA after further analysis of our long-term extension treatment data compared to natural history data.

We are evaluating the utility of maralixibat in BA and plan to initiate a clinical program in 2020. Prior to initiation, we intend to discuss the design and scope of our planned clinical program for maralixibat in BA with regulatory authorities. As we have not tested maralixibat in subjects with BA or subjects less than 12 months old, regulatory authorities may require us to conduct a Phase 2 clinical trial and/or additional clinical development activities before we are able to conduct a Phase 3 clinical trial.

Volixibat has been evaluated in over 300 subjects across multiple clinical trials. In Phase 1 clinical trials in 92 healthy volunteers, volixibat was generally well tolerated. The most common AEs reported were mild to moderate GI events observed in the volixibat groups. The only treatment-related SAE reported was one event of elevated ALT. Volixibat was also found to decrease cholesterol levels in healthy subjects, consistent with its mechanism of lowering bile acid levels.

An additional Phase 1 clinical trial was conducted in obese and overweight, but otherwise healthy, adults to evaluate volixibat’s potential to lower bile acid levels by measuring the excretion of bile acids in the feces. This clinical trial indicated volixibat increased fecal bile acid levels in a dose dependent manner, but without appreciable change in GI tolerability at higher doses. We believe these results provide evidence of volixibat’s potential utility for the treatment of cholestatic liver diseases given its activity on ASBT inhibition.

Volixibat was studied in a multicenter, Phase 2, double-blind, randomized, placebo-controlled non-alcoholic steatohepatitis, or NASH, clinical trial. 196 participants were randomized to receive oral placebo or volixibat in doses of 5 mg, 10 mg or 20 mg QD for 48 weeks. The safety results were consistent with prior clinical trials of volixibat. In a planned interim analysis, there was no difference between volixibat and placebo treated groups on magnetic resonance imaging-derived proton density fat fraction. Volixibat was associated with lower LDL cholesterol and increased C4, indicative of ASBT inhibition. After the interim analysis, Shire plc discontinued the development of volixibat for the treatment of NASH. Based on these results, we plan to pursue the development of volixibat for the treatment of adult cholestatic liver diseases.

We are evaluating the utility of volixibat in adult cholestatic liver diseases and plan to commence clinical trials in PSC and ICP in 2020. We are conducting a Phase 1 dose ranging bile acid excretion study to determine dose levels for our planned efficacy studies. In PSC, based on the reductions in pruritus observed in PSC patients receiving maralixibat, we plan to conduct a Phase 2 clinical trial of volixibat in PSC patients with pruritus. In ICP, we plan to evaluate the potential of volixibat to lower sBA levels in patients with elevated sBA levels, who are considered at high risk of preterm labor, stillbirth or other perinatal complications.

In November 2018, we entered into an assignment and license agreement, or the Shire License Agreement, with Shire. Pursuant to the Shire License Agreement, Shire assigned, transferred and conveyed all of its right, title and interest in and to the Pfizer Agreement, Satiogen Agreement and Sanofi Agreement, each of which is defined below.

In addition, Shire granted us an exclusive, royalty bearing, sublicensable, worldwide license under certain regulatory materials as well as patents and know-how, which we refer to collectively as the Shire IP, relating to the maralixibat compound and the volixibat compound in development by Shire as of that date, which we collectively refer to as the Shire Licensed Products, to develop, have developed, make, have made, use, sell, have sold, offer for sale or import the Shire Licensed Products worldwide for the therapeutic or prophylactic application in human health. We have sole authority and responsibility over development and commercialization activities for the Shire Licensed Products, and we are required to use commercially reasonable efforts to perform certain development, regulatory and commercialization activities with respect to the PFIC, ALGS and BA indications for maralixibat and unspecified indications with respect to volixibat. We will solely own all inventions and discoveries arising out of activities conducted by us under the Shire License Agreement. We will also be responsible for the preparation, filing, prosecution and maintenance of patents under the Shire License Agreement and the cost thereof. We have the first right, but are not obligated, to enforce any patent licensed under the Shire License Agreement.

As consideration for the rights granted to us under the Shire License Agreement, we made a one-time upfront payment to Shire of $7.5 million and issued Shire 1,859,151 shares of our common stock pursuant to a common stock issuance agreement that we entered into concurrently with the Shire License Agreement. We are obligated to make a $2.5 million milestone payment to Shire as a result of the initiation of the Phase 3 MARCH clinical trial in July 2019.

We are also required to pay Shire up to an aggregate of $107.0 million upon the achievement of certain other clinical development and regulatory milestones for maralixibat in the PFIC, ALGS and BA indications, and a $25.0 million payment upon regulatory approval of maralixibat for each and every other indication. Each such milestone payment will be paid only once for each such indication during the term of the Shire License Agreement, the first time maralixibat reaches such milestone event, regardless of the number of times such milestone is reached by maralixibat for the same indication. In addition, we are required to pay up to an aggregate of $30.0 million upon the achievement of certain clinical development and regulatory milestones for volixibat solely for the first indication sought. Each such milestone payment will be paid only once for the first indication for which volixibat is developed during the term of the Shire License Agreement, the first time volixibat reaches such milestone event, regardless of the number of products or the number of indications for which volixibat is developed.

Upon achievement of certain thresholds for aggregate worldwide net sales for all Shire Licensed Products, we are required to pay Shire, on a one-time, non-refundable and non-creditable basis, up to an aggregate of $30.0 million in tiered sales milestone payments. Lastly, upon certain annual worldwide net sales of all Shire Licensed Products, we are required to pay Shire, on a non-refundable and non-creditable basis, tiered royalties with rates ranging from low double-digits to mid-teens, or the Shire royalties. If we actually make royalty payments to Sanofi, which is defined below, under the Sanofi Agreement, the Shire royalties will be reduced by low to high single digit percentages of certain net sales thresholds. Similarly, if we actually make royalty payments to Satiogen, which is defined below, under the Satiogen Agreement, the Shire royalties will be reduced by a low single digit percentage of net sales.

Under the Shire License Agreement, we are prohibited from developing any competing product prior to the five year anniversary of the first commercial sale of a Shire Licensed Product, or commercializing any competing product prior to the eight year anniversary of the first commercial sale of a Shire Licensed Product. For purposes of the Shire License Agreement, a competing product is any product that is or contains a compound (A) where the primary method of action is ASBT inhibition activity or (B) that is commercialized or developed for any PFIC, ALGS, or BA indication, except (B) shall not apply with respect to (1) a given indication if a product failure has occurred with respect to such indication (e.g., if a product failure has occurred for a Shire Licensed Product for the BA indication, we may thereafter develop and commercialize a product for the BA indication if such product uses a different primary method of action than ASBT inhibition activity) or (2) a given product if such product is a product that is not deleterious to the sales or pricing of a Shire Licensed Product.

The Shire License Agreement will remain in effect on a country-by-country and Shire Licensed Product-by-Shire Licensed Product basis and will continue on such basis until the later of the (i) expiration of the last patent or patent application licensed under the Shire License Agreement that covers a Shire Licensed Product, (ii) expiration of any regulatory exclusivity period, and (iii) tenth anniversary of the first commercial sale of such Shire Licensed Product in such country. The term of the last patent or patent application licensed under the Shire License Agreement ends on October 26, 2032, absent patent term adjustment or extension. After November 5, 2021, we may unilaterally terminate the Shire License Agreement for any reason or no reason upon 90 days’ written notice to Shire. In addition, we may also terminate the Shire License Agreement if we reasonably determine that we are precluded from further development due to materially adverse pre-clinical or clinical pathology or toxicology data. Either party may terminate the Shire License Agreement in the event of the other party’s insolvency or for the other party’s material breach of the Shire License Agreement that remains uncured after 90 days of receiving written notice of such breach. Shire may terminate the Shire License Agreement upon our or our affiliates’ challenge to the validity of the patents licensed under the Shire License Agreement.

Through the Shire License Agreement, we were assigned the rights to the license agreement, or the Pfizer Agreement, with Pfizer Inc., or Pfizer, pursuant to which we obtained an exclusive, worldwide license to Pfizer’s know-how related to maralixibat, or the Pfizer Know-How. Under the Pfizer Agreement, we are permitted to research, develop, manufacture and commercialize products utilizing the Pfizer Know-How for the diagnosis, treatment, prevention, mitigation and cure of human diseases and disorders, and to sublicense such rights. Pfizer retained the right to use the Pfizer Know-How to conduct internal research and to use a third party to conduct research on Pfizer’s behalf.

We have sole responsibility and control over development and commercialization activities for the Pfizer Know-How and products utilizing the Pfizer Know-How, and we are obligated to use commercially reasonable efforts to develop and commercialize products utilizing the Pfizer Know-How. In the event we determine to sublicense to a third party our right to commercialize the Pfizer Know-How or products utilizing the Pfizer Know-How under the Pfizer Agreement, Pfizer has the first right to negotiate such a commercial license with us.

Ownership of inventions and discoveries under the Pfizer Agreement will be determined in accordance with the rules of inventorship under United States patent laws. We will own and bear all expenses incurred in preparing, filing, prosecuting and maintaining all patents for inventions that are solely invented by us.

As consideration, upon commercialization of any product utilizing the Pfizer Know-How, we will be required to pay to Pfizer a low single-digit royalty on net sales of such products sold by us, our affiliates or sublicensees. Our royalty obligations continue on a licensed product-by-licensed product basis until the eighth anniversary of the first commercial sale of such licensed product anywhere in the world.

We may unilaterally terminate the Pfizer Agreement for any reason or no reason upon 90 days’ written notice to Pfizer. Either party may terminate the Pfizer Agreement in the event of the other party’s insolvency or for the other party’s material breach of the Pfizer Agreement which remains uncured after 60 days of receiving written notice of such breach, or 30 days in the case of a payment breach. Absent early termination, the Pfizer Agreement will automatically expire on a country-by-country basis upon the expiration of our royalty payment obligations.

Through the Shire License Agreement, we were assigned the rights to the license agreement, as amended, or the Sanofi Agreement, with Sanofi-Aventis Deutschland GmbH, or Sanofi, under which we obtained an exclusive, worldwide license to certain patents and know-how controlled by Sanofi related to volixibat, or the Sanofi Technology. Under the Sanofi Agreement, we are permitted to develop and commercialize products containing volixibat utilizing the Sanofi Technology. Additionally, under the Sanofi Agreement, we are permitted to manufacture products containing volixibat utilizing the Sanofi Technology and to sublicense such rights. In addition, Sanofi granted to us, under certain conditions, an exclusive option to obtain an exclusive license to manufacture volixibat during the term of the Sanofi Agreement. Unless and until we exercise such option, Sanofi has the exclusive right to supply volixibat to us to develop and commercialize products utilizing the Sanofi Technology. Sanofi retained the right to practice the Sanofi Technology outside the scope of the license granted to us under the Sanofi Agreement and to make and use for internal research purposes, provided that upon our request, Sanofi is obligated to provide us with a written summary of the results of any such research to the extent such results relate to the use of volixibat as an ASBTi.

Under the Sanofi Agreement, we have sole authority and responsibility over development and commercialization activities for licensed products, and we are required to use diligent efforts to perform certain development, regulatory and commercialization activities.

With the exception of Sanofi’s rights on its further optimization of the process of manufacturing of the product utilizing the Sanofi Technology, we will own all inventions and discoveries arising out of activities conducted by us under the Sanofi Agreement and we will be responsible for the preparation, filing, prosecution and maintenance of patents under the Sanofi Agreement. Further, we will have the first right, but will not be obligated, to enforce patents under the Sanofi Agreement. If we do not exercise our right to enforce patents under the Sanofi Agreement, Sanofi will be able to enforce the patents.

We are required to pay to Sanofi up to an aggregate of $36.0 million upon the achievement of certain regulatory, commercialization and product sales milestones. Upon commercialization of any product utilizing the Sanofi Technology, we will be required to pay to Sanofi tiered royalties in the mid to high single-digit range based upon net sales of licensed products sold by us and our affiliates and sublicensees in a calendar year, subject to adjustments in certain circumstances. Our royalty obligations continue on a licensed product-by-licensed product and country-by-country basis until the later to occur of the expiration of the last valid claim in a licensed patent or patent application covering the applicable licensed product in such country and ten years after the first commercial sale of a licensed product following regulatory approval in such country. The term of the last patent or patent application licensed under the Sanofi Agreement ends on May 26, 2030, absent patent term adjustment or extension. In the event we sublicense our right to commercialize a product utilizing the Sanofi Technology, we are obligated to pay to Sanofi a fee based on a percentage of sublicense fees received by us, which percentage ranges from the mid-teens to low-thirties, depending on the stage of development of such licensed product, and is subject to adjustment in certain circumstances.

For three years after the first commercial sale of a product utilizing the Sanofi Technology, on a licensed product-by-licensed product basis, we may not, through our own efforts or with an affiliate or third party, commercialize any product for specified indications with a method of action that reduces the reabsorption of bile acids in the intestinal tract, except for the commercialization of products utilizing the Sanofi Technology under the Sanofi Agreement.

We may unilaterally terminate the Sanofi Agreement for any reason or no reason upon 60 days’ written notice to Sanofi after the second anniversary of the Sanofi Agreement. We may also terminate the Sanofi Agreement on a country-by-country or licensed product-by-licensed product basis upon written notice to Sanofi (1) if we reasonably determine that we are precluded from proceeding with the first Phase 2b clinical trial for a product utilizing the Sanofi Technology in certain major markets due to certain safety failures or (2) after using diligent efforts, we reasonably determine that we are precluded from proceeding with a Phase 3 clinical trial for a product utilizing the Sanofi Technology in certain major markets due to certain safety or efficacy failures. Either party may terminate the Sanofi Agreement in the event of the other party’s insolvency or for the other party’s material breach of the Sanofi Agreement which remains uncured after 90 days of receiving written notice of such breach, or ten business days in the case of a payment breach. Absent early termination, the Sanofi Agreement will remain in effect on a country-by-country and licensed product-by-licensed product basis until the expiration of our royalty payment obligations for such licensed product in such country.

Through the Shire License Agreement, we were assigned the rights to the license agreement, as amended, or the Satiogen Agreement, with Satiogen Pharmaceuticals, Inc., or Satiogen, under which we obtained an exclusive, worldwide license to certain patents and know-how controlled by Satiogen related to ASBT inhibitors, or the ASBTi Technology, and TGR5 agonists, or the TGR5 Technology. Under the Satiogen Agreement, we are permitted to develop, manufacture and commercialize products utilizing the ASBTi Technology or TGR5 Technology for the diagnosis, treatment, prevention, mitigation and cure of human diseases and disorders, other than diabetes, obesity or a combination thereof, and to sublicense such rights.

We have sole responsibility and control over development and commercialization activities for products utilizing the ASBTi Technology or TGR5 Technology under the Satiogen Agreement and we are required to use commercially reasonable efforts to develop and commercialize such licensed products.

Ownership of inventions and discoveries conceived or reduced to practice under the Satiogen Agreement will be determined in accordance with the rules of inventorship under United States patent laws. We will own any and all inventions made by us or jointly with Satiogen under the Satiogen Agreement and we will be responsible for filing, prosecuting and maintaining any patents for such inventions. Satiogen will own any and all inventions that are solely invented by Satiogen under the Satiogen Agreement and will be responsible for preparing, filing, prosecuting and maintaining any patents for such inventions. Satiogen will be responsible for filing, prosecuting and maintaining patents related to the ASBTi Technology and TGR5 Technology controlled by Satiogen as of the effective date or during the term of the Satiogen Agreement. Additionally, prior to certain events specified in the Satiogen Agreement, Satiogen will have the sole right, but not the obligation, to enforce patents related to the ASBTi Technology and the TGR5 Technology; after which, we will have the sole right, but not the obligation, to enforce patents related to the ASBTi Technology and the TGR5 Technology. In March 2017, the Satiogen Agreement was amended to terminate the license of certain patents related to the ASBTi Technology and TGR5 Technology as each relates to diabetes and obesity.

We are required to pay to Satiogen up to an aggregate of $10.5 million upon the achievement of certain milestones, of which $0.5 million relates to the initiation of certain development activities, $5.0 million relates to the completion of regulatory approvals and $5.0 million relates to commercialization activities. We will be required to pay to Satiogen a low single-digit royalty on net sales of products utilizing the ASBTi Technology or TGR5 Technology sold by us and our affiliates. Our royalty obligations continue on a licensed product-by-licensed product and country-by-country basis until the expiration of the last valid claim in a licensed patent or patent application covering the applicable licensed product in such country. The term of the last patent or patent application licensed under the Satiogen Agreement ends on August 30, 2031, absent patent term adjustment or extension.

In the event we sublicense any of our rights under the ASBTi Technology or TGR5 Technology to a third party, we are obligated under the Satiogen Agreement to pay to Satiogen a fee based on a percentage of sublicense revenue received by us, which percentage ranges from the mid-teens to mid-twenties, depending on whether the right granted is in connection with the ASBTi Technology or TGR5 Technology, and the stage of development of such sublicensed technology. In addition, we are obligated under the Satiogen Agreement to pay to Satiogen a percentage of royalties we receive in consideration for the grant of such sublicense based on a percentage of revenue generated by such sublicensee for sales of products utilizing the ASBTi Technology or TGR5 Technology, which percentage is in the low-fifties and is subject to adjustment in certain circumstances. This payment will not exceed an amount that is one-half of our low single-digit royalty obligation to Satiogen.

We may unilaterally terminate the Satiogen Agreement for any reason or no reason upon 90 days’ written notice to Satiogen. If we cease all research, development and commercialization efforts with respect to all licensed products related to the ASBTi Technology or the TGR5 Technology for over one year, or we determine to cease all such efforts, Satiogen may elect to terminate the Satiogen Agreement with respect to the license under the ASBTi Technology or the TGR5 Technology, respectively. Either party may terminate the Satiogen Agreement for the other party’s material breach of the Satiogen Agreement which remains uncured after 90 days of receiving written notice of such breach. Absent early termination, the Satiogen Agreement will automatically terminate upon the expiration of our royalty obligations.

Our success depends in part on our ability to obtain and maintain proprietary protection for our product candidates and other discoveries, inventions, trade secrets and know-how that are critical to our business operations. Our success also depends in part on our ability to operate without infringing the proprietary rights of others, and in part, on our ability to prevent others from infringing our proprietary rights. A comprehensive discussion on risks relating to intellectual property is provided under “Risk Factors” under the subsection “Risks Related to Our Intellectual Property.”

We have developed and continue to develop patent portfolios around our product candidates, maralixibat and volixibat. We have pending patent applications in the United States, Europe, South Korea, Israel, Brazil, Canada, Hong Kong and Singapore covering the methods of treating cholestasis using ASBT inhibitors that have limited systemic exposure, which, if issued, would expire in October 2032, absent any patent term adjustments or extensions. We have an issued patent in the United Stated directed to treating or ameliorating PFIC2 in a pediatric subject comprising administering maralixibat, which expires in October 2032. We have granted and/or issued patents in Australia, China, Japan, Mexico, Armenia, Azerbaijan, Belarus, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, Turkmenistan, South Africa and Macau covering the methods of treating cholestasis using ASBT inhibitors that have limited systemic exposure, which expire in October 2032. We also have pending patent applications in Brazil, Canada, South Korea, Mexico, Hong Kong, Singapore and South Africa, covering pediatric formulations of ASBT inhibitors that have limited systemic exposure, which, if issued, would expire in October 2032, absent any patent term adjustments or extensions. We have granted and/or issued patents in Australia, China, Israel, Japan, Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Ireland, Italy, Netherlands, Norway, Poland, Portugal, Slovak Republic, Spain, Sweden, Switzerland, United Kingdom, Armenia, Azerbaijan, Belarus, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, Macau and Turkmenistan covering pediatric formulations of ASBT inhibitors that have limited systemic exposure, which expire in October 2032. We have licensed patent applications in the United States and Europe from Satiogen covering therapeutic uses of ASBT inhibitors that have limited systemic exposure for treating inflammatory intestinal conditions, which, if issued, would expire in May 2031, absent any patent term adjustments or extensions. One of these Satiogen applications recently issued as United States Patent No. 10,251,880. We have licensed an issued United States patent, as well as issued foreign counterparts in Argentina, Austria, Australia, Belgium, Canada, Switzerland, China, Germany, Denmark, Spain, Finland, France, United Kingdom, Greece, Hong Kong, Ireland, Israel, India, Italy, Japan, South Korea, Liechtenstein, Mexico, Malaysia, Netherlands, Norway, Portugal, Russia, Sweden, Singapore, Taiwan and Turkey, and a pending counterpart in Brazil from Sanofi, that cover the composition and methods of making volixibat and salts thereof, expiring in December 2027. Patents related to maralixibat and volixibat may be eligible for patent term extensions in certain jurisdictions, including the United States and Europe, upon approval of a commercial use of the corresponding product by a regulatory agency in the jurisdiction where the patent was granted and/or issued.

We do not have patents or patent applications covering maralixibat as a composition of matter. Therefore, the primary patent-based intellectual property protection for our maralixibat program will be any patents granted on the pending method-of-use and formulation patent applications.

In addition to patent protection, we rely on trade secret protection, trademark protection and know-how to expand our proprietary position around our chemistry, technology and other discoveries and inventions that we consider important to our business. We are a party to a number of license agreements under which we are granted intellectual property rights to know-how that are important to our business. We have licensed know-how related to maralixibat in the United States, Europe and other countries from Pfizer. We have licensed know-how related to ASBTi Technology and TGR5 Technology from Satiogen. We have licensed know-how related to volixibat from Sanofi. Our existing license agreements as related to maralixibat and volixibat impose various development, regulatory and/ commercial diligence obligations, payment of milestones and/or royalties and other obligations.

In addition, we currently have orphan drug designation for maralixibat for the treatment of ALGS, PFIC, PSC and PBC in the United States and the European Union, providing the opportunity to receive seven years of market exclusivity in the United States, which can be extended to seven and a half years if trials are conducted in accordance with an agreed-upon pediatric investigational plan, and ten years of market exclusivity in the European Union, which can be extended to 12 years in the European Union if trials are conducted in accordance with an agreed-upon pediatric investigational plan.

Upon approval in the United States, as neither maralixibat or volixibat has previously been approved in the United States for any indication, both product candidates may be eligible for five years of new chemical entity exclusivity, which would run currently with their seven years of orphan drug exclusivity if we obtain orphan drug exclusivity for their approved uses.

We also seek to protect our intellectual property in part by entering into confidentiality agreements with companies with whom we share proprietary and confidential information in the course of business discussions, and by having confidentiality terms in our agreements with our employees, consultants, scientific advisors, clinical investigators and other contractors and also by requiring our employees, commercial contractors, and certain consultants and investigators, to enter into invention assignment agreements that grant us ownership of any discoveries or inventions made by them while in our employ.

Furthermore, we seek trademark protection in the United States and internationally where available and when we deem appropriate.

We currently do not have a commercial organization for the marketing, sales and distribution of pharmaceutical products. We intend to build the commercial infrastructure necessary to effectively support the commercialization of maralixibat and volixibat, if approved, in North America and Europe and to partner with third parties for commercialization of maralixibat and volixibat in other markets. We believe that our commercial organization can be modest in size and targeted to the relatively small number of specialists who treat patients with PFIC and ALGS.

The commercial infrastructure for orphan products typically consists of a targeted, specialty sales force that calls on a limited and focused group of physicians supported by sales management, internal sales support, an internal marketing group and distribution support. Additional capabilities important to the marketplace include the management of key accounts such as managed care organizations, group-purchasing organizations, specialty pharmacies, government accounts and reimbursement support. Based on the number of physicians that treat cholestatic liver diseases, we believe that we can effectively target the relevant audience for maralixibat and volixibat in North America and Europe by establishing a sales force either internally or through a contract sales force. To develop the appropriate commercial infrastructure, we will have to invest significant amounts of financial and management resources, some of which will be committed prior to any confirmation that maralixibat or volixibat will be approved.

We do not own or operate manufacturing facilities for the production of maralixibat and volixibat or other product candidates that we may develop, nor do we have plans to develop our own manufacturing operations in the foreseeable future. We currently depend on third-party contract manufacturers for all of our required raw materials, active pharmaceutical ingredient and finished products for our clinical trials. We do not have any current contractual arrangements for the manufacture of commercial supplies of maralixibat or volixibat. Prior to our receipt of any approval from the FDA, if at all, we intend to enter into agreements for commercial production of our product candidates with third party suppliers. We currently employ internal resources and third-party consultants to manage our manufacturing contractors.

There are no FDA-approved therapies for the treatment of ALGS, PFIC, PSC or ICP in the United States. Symptomatic treatment with antipruritics, such as cholestyramine, typically provides only modest relief. Bristol Myers Squibb Company has discontinued its brand name cholestyramine, but generic versions of the drug are marketed by Upsher-Smith Laboratories, Inc., Par Pharmaceutical Companies, Inc. and Sandoz Inc., the generic pharmaceuticals division of Novartis AG. UDCA is marketed by a number of generic pharmaceutical companies such as Mylan Inc., Actavis Inc., Lannett Company, Inc. and Par Pharmaceutical Companies, Inc.

A number of drugs, including UDCA, rifampin and naltrexone, are used off-label to treat patients suffering from cholestatic liver diseases. Additionally, surgical interventions, such as partial external biliary diversion and nasobiliary drainage, and extracorporeal liver support, such as Molecular Adsorbent Recirculation System, are also employed in an attempt to lower bile acid levels, manage pruritus and improve measures of liver function.

We are aware of two other companies pursuing clinical development of therapies that reduce sBA levels via the ASBT pathway. GlaxoSmithKline plc and Albireo Pharma, Inc., or Albireo, have ASBT inhibitors in clinical development for cholestatic liver diseases. We are aware that Albireo is enrolling a Phase 3 trial for PFIC1 and PFIC2 patients for A4250, or odevixibat, and has announced plans to pursue development in BA and other cholestatic liver diseases. Albireo has announced plans to release PFIC Phase 3 topline data in mid-2020 and to initiate a clinical trial of A4250 in BA in 2020. We are aware that GlaxoSmithKline plc is conducting a Phase 2 trial of its ASBTi in PBC patients. We are also aware that Intercept Pharmaceuticals, Inc. is exploring BA as an indication for obeticholic acid. Further, we may compete with companies that are developing gene therapy for the treatment of PFIC. In adult settings of cholestasis, similar to pediatric settings, cholestyramine, UDCA, rifampin and naltrexone are commonly used agents. We are not aware of FDA approved therapeutics for the treatment of PSC or ICP. We are aware of several agents in clinical development for the treatment of PSC, including Allergan plc’s cenicriviroc, DURECT Corporation’s DUR928, Gilead Sciences, Inc.’s GS-9674, HighTide Therapeutics Inc.’s HTD1801, Intercept Pharmaceuticals, Inc.’s Ocaliva, or obeticholic acid and NGM Biopharmaceuticals, Inc.’s NGM282. Furthermore, one of our own product candidates may be used off-label in the market for another of our product candidates, adversely affecting the sales of that product candidate.

As a pharmaceutical company that operates in the United States, we are subject to extensive regulation. Government authorities in the United States (at the federal, state and local level) and in other countries extensively regulate, among other things, the research, development, testing, manufacturing, quality control, approval, labeling, packaging, storage, record-keeping, promotion, advertising, distribution, post-approval monitoring and reporting, marketing and export and import of drug products such as those we are developing. Maralixibat and volixibat and any other product candidates that we develop must be approved by the FDA before they may be legally marketed in the United States and by the appropriate foreign regulatory agency before they may be legally marketed in foreign countries. Generally, our activities in other countries will be subject to regulation that is similar in nature and scope as that imposed in the United States, although there can be important differences. Additionally, some significant aspects of regulation in Europe are addressed in a centralized way, but country-specific regulation remains essential in many respects.

In the United States, the FDA regulates drugs under the Federal Food, Drug and Cosmetic Act, or FDCA, and implementing regulations. Drugs are also subject to other federal, state and local statutes and regulations. The process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources. Failure to comply with the applicable U.S. requirements at any time during the product development process, approval process or after approval, may subject an applicant to administrative or judicial sanctions. FDA sanctions could include, among other actions, refusal to approve pending applications, withdrawal of an approval, a clinical hold, warning letters, product recalls or withdrawals from the market, product seizures, total or partial suspension of production or distribution injunctions, fines, refusals of government contracts, restitution, disgorgement or civil or criminal penalties. Any agency or judicial enforcement action could have a material adverse effect on us. The process required by the FDA before a drug may be marketed in the United States generally involves the following:

Before testing any compounds with potential therapeutic value in humans, the drug candidate enters the preclinical testing stage. Preclinical tests include laboratory evaluations of product chemistry, toxicity and formulation, as well as animal studies, to assess the potential safety and activity of the drug candidate. The conduct of the preclinical tests must comply with federal regulations and requirements including GLPs. The sponsor must submit the results of the preclinical tests, together with manufacturing information, analytical data, any available clinical data or literature and a proposed clinical protocol, to the FDA as part of the IND. An IND is a request for authorization from the FDA to administer an investigational drug product to humans. The central focus of an IND submission is on the general investigational plan and the protocol(s) for human trials. Some preclinical testing may continue even after the IND is submitted. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA raises concerns or questions regarding the proposed clinical trials and places the IND on clinical hold within that 30-day time period. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. The FDA may also impose clinical holds on a drug candidate at any time before or during clinical trials due to safety concerns or non-compliance.

Clinical trials involve the administration of the drug candidate to healthy volunteers or patients under the supervision of qualified investigators, generally physicians not employed by or under the trial sponsor’s control, in accordance with GCPs, which include the requirement that all research subjects provide their informed consent for their participation in any clinical trial. Clinical trials are conducted under protocols detailing, among other things, the objectives of the clinical trial, dosing procedures, subject selection and exclusion criteria and the parameters to be used to monitor subject safety and assess efficacy. Each protocol, and any subsequent amendments to the protocol, must be submitted to the FDA as part of the IND. Further, each clinical trial must be reviewed and approved by an independent institutional review board, or IRB, at or servicing each institution at which the clinical trial will be conducted. An IRB is charged with protecting the welfare and rights of trial participants and considers such items as whether the risks to individuals participating in the clinical trials are minimized and are reasonable in relation to anticipated benefits. The IRB also approves the informed consent form that must be provided to each clinical trial subject or his or her legal representative and must monitor the clinical trial until completed. There are also requirements governing the reporting of ongoing clinical trials and completed clinical trial results to public registries.

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

Post-approval studies, or Phase 4 clinical trials, may be conducted after initial marketing approval. These trials are used to gain additional experience from the treatment of patients in the intended therapeutic indication. In certain instances, FDA may mandate the performance of Phase 4 trials. In certain instances, the FDA may mandate the performance of Phase 4 clinical trials as a condition of approval of an NDA.

Progress reports detailing the results of the clinical trials must be submitted at least annually to the FDA and written IND safety reports must be submitted to the FDA and the investigators for serious and unexpected adverse events or any finding from tests in laboratory animals that suggests a significant risk for human subjects. Phase 1, Phase 2 and Phase 3 clinical trials may not be completed successfully within any specified period, if at all. The FDA, the IRB, or the sponsor may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects or patients are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug has been associated with unexpected serious harm to patients. 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 or not a trial may move forward at designated check points based on access to certain data from the trial.

Concurrent with clinical trials, companies usually complete additional animal studies and must also develop additional information about the chemistry and physical characteristics of the drug as well as finalize a process for manufacturing the product in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the drug candidate and, among other things, must develop methods for testing the identity, strength, quality and purity of the final drug. Additionally, appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the drug candidate does not undergo unacceptable deterioration over its shelf life.

The results of product development, preclinical studies and clinical trials, along with descriptions of the manufacturing process, analytical tests conducted on the chemistry of the drug, proposed labeling and other relevant information are submitted to the FDA as part of an NDA requesting approval to market the product. Data may come from company-sponsored clinical trials intended to test the safety and effectiveness of a use of a product, or from a number of alternative sources, including studies initiated by investigators. To support marketing approval, the data submitted must be sufficient in quality and quantity to establish the safety and effectiveness of the investigational drug product to the satisfaction of the FDA. The submission of an NDA is subject to the payment of substantial user fees; a waiver of such fees may be obtained under certain limited circumstances.

In addition, the Pediatric Research Equity Act, or PREA, requires a sponsor to conduct pediatric clinical trials for most drugs, for a new active ingredient, new indication, new dosage form, new dosing regimen or new route of administration. Under PREA, original NDAs and supplements must contain a pediatric assessment unless the sponsor has received a deferral or waiver. The required assessment must evaluate the safety and effectiveness of the product for the claimed indications in all relevant pediatric subpopulations and support

dosing and administration for each pediatric subpopulation for which the product is safe and effective. The sponsor or FDA may request a deferral of pediatric clinical trials for some or all of the pediatric subpopulations. A deferral may be granted for several reasons, including a finding that the drug is ready for approval for use in adults before pediatric clinical trials are complete or that additional safety or effectiveness data needs to be collected before the pediatric clinical trials begin. The FDA must send a non-compliance letter to any sponsor that fails to submit the required assessment, keep a deferral current or fails to submit a request for approval of a pediatric formulation. Unless otherwise required by regulation, the Pediatric Research Equity Act does not apply to any drug for an indication for which orphan designation has been granted. However, if only one indication for a product has orphan designation, a pediatric assessment may still be required for any applications to market that same product for the non-orphan indication(s).

The FDA reviews all NDAs submitted before it accepts them for filing and may request additional information rather than accepting an NDA for filing. The FDA must make a decision on accepting an NDA for filing within 60 days of receipt. Once the submission is accepted for filing, the FDA begins an in-depth review of the NDA. Under the Prescription Drug User Fee Act, or PDUFA, guidelines that are currently in effect, the FDA has a goal of ten months from the date of “filing” of a standard NDA for a new molecular entity to review and act on the submission. This review typically takes twelve months from the date the NDA is submitted to FDA because the FDA has approximately two months to make a “filing” decision after it the application is submitted The FDA does not always meet its PDUFA goal dates for standard and priority NDAs, and the review process is often significantly extended by FDA requests for additional information or clarification.

After the NDA submission is accepted for filing, the FDA reviews the NDA to determine, among other things, whether the proposed product is safe and effective for its intended use and whether the product is being manufactured in accordance with cGMP to assure and preserve the product’s identity, strength, quality and purity. The FDA may refer applications for novel drug products or drug products which present difficult questions of safety or efficacy to an advisory committee, typically a panel that includes clinicians and other experts, for review, evaluation and a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions and typically follows the advisory committee’s recommendations.

Before approving an NDA, the FDA will inspect the facilities at which the product is manufactured. The FDA will not approve the product unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent production of the product within required specifications. Additionally, before approving an NDA, the FDA may inspect one or more clinical sites to assure compliance with GCP requirements. After the FDA evaluates the application, manufacturing process and manufacturing facilities, it may issue an approval letter or a Complete Response Letter. An approval letter authorizes commercial marketing of the drug with specific prescribing information for specific indications. A Complete Response Letter indicates that the review cycle of the application is complete and the application will not be approved in its present form. A Complete Response Letter usually describes all of the specific deficiencies in the NDA identified by the FDA. The Complete Response Letter may require additional clinical data and/or (an) additional pivotal Phase 3 clinical trial(s), and/or other significant and time-consuming requirements related to clinical trials, preclinical studies or manufacturing. If a Complete Response Letter is issued, the applicant may either resubmit the NDA, addressing all of the deficiencies identified in the letter, or withdraw the application. Even if such data and information is submitted, the FDA may ultimately decide that the NDA does not satisfy the criteria for approval.

If a product receives regulatory approval, the approval may be significantly limited to specific diseases and dosages or the indications for use may otherwise be limited, which could restrict the commercial value of the product. Further, the FDA may require that certain contraindications, warnings or precautions be included in the product labeling or may condition the approval of the NDA on other changes to the proposed labeling, development of adequate controls and specifications, or a commitment to conduct one or more post-market

studies or clinical trials. For example, the FDA may require Phase 4 testing, which involves clinical trials designed to further assess a drug safety and effectiveness, and may require testing and surveillance programs to monitor the safety of approved products that have been commercialized. The FDA may also determine that a risk evaluation and mitigation strategy, or REMS, is necessary to assure the safe use of the drug. If the FDA concludes a REMS is needed, the sponsor of the NDA must submit a proposed REMS; the FDA will not approve the NDA without an approved REMS, if required. A REMS could include medication guides, physician communication plans, or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools.

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug intended to treat a rare disease or condition, which is a disease or condition that affects fewer than 200,000 individuals in the United States or, if it affects more than 200,000 individuals in the United States, there is no reasonable expectation that the cost of developing and making a drug product available in the United States for this type of disease or condition will be recovered from sales of the product. Orphan designation must be requested before submitting an NDA. After the FDA grants orphan designation, the identity of the therapeutic agent and its potential orphan use are disclosed publicly by the FDA. Orphan designation does not convey any advantage in or shorten the duration of the regulatory review and approval process.

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 product exclusivity, which means that the FDA may not approve any other applications to market the same drug or biological product for the same indication for seven years, except in limited circumstances, such as a showing of clinical superiority to the product with orphan exclusivity or inability to manufacture the product in sufficient quantities. The designation of such drug also entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages and user-fee waivers. Competitors, however, may receive approval of different products for the indication for which the orphan product has exclusivity or obtain approval for the same product but for a different indication for which the orphan product has exclusivity. Orphan exclusivity also could block the approval of one of our products for seven years if a competitor obtains approval of the same drug as defined by the FDA or if our product candidate is determined to be contained within the competitor’s product for the same indication or disease. If an orphan designated product receives marketing approval for an indication broader than what is designated, it may not be entitled to orphan exclusivity. Orphan drug status in the European Union has similar but not identical benefits in that jurisdiction.

In 2012, Congress authorized the FDA to award priority review vouchers to sponsors of certain rare pediatric disease product applications. This provision is designed to encourage development of new drug and biological products for prevention and treatment of certain rare pediatric diseases. Specifically, under this program, a sponsor who receives an approval for a drug or biologic for a “rare pediatric disease” may qualify for a voucher that can be redeemed to receive a priority review of a subsequent marketing application for a different product. The sponsor of a rare pediatric disease drug product receiving a priority review voucher may transfer (including by sale) the voucher to another sponsor. The voucher may be further transferred any number of times before the voucher is used, as long as the sponsor making the transfer has not yet submitted the application. The FDA may also revoke any priority review voucher if the rare pediatric disease drug for which the voucher was awarded is not marketed in the U.S. within one year following the date of approval.

Designation, but the designation process is entirely voluntary; requesting designation is not a prerequisite to requesting or receiving a priority review voucher. In addition, sponsors who choose not to submit a Rare Pediatric Disease Designation request may nonetheless receive a priority review voucher if they request such a voucher in their original marketing application and meet all of the eligibility criteria. Congress has only authorized the Rare Pediatric Disease Priority Review Voucher program until September 30, 2020. However, if a drug candidate receives Rare Pediatric Disease Designation before October 1, 2020, it is eligible to receive a voucher if it is approved before October 1, 2022.

The FDA has a fast track designation program that is intended to expedite or facilitate the process for reviewing new drug products that meet certain criteria. Specifically, new drugs are eligible for Fast Track designation if they are intended to treat a serious or life-threatening disease or condition and demonstrate the potential to address unmet medical needs for the disease or condition. Unique to a fast track product, the FDA may consider for review sections of the NDA on a rolling basis before the complete application is submitted, if the sponsor provides a schedule for the submission of the sections of the NDA, the FDA agrees to accept sections of the NDA and determines that the schedule is acceptable, and the sponsor pays any required user fees upon submission of the first section of the NDA.

Any product submitted to the FDA for approval, including a product with a fast track designation, may also be eligible for other types of FDA programs intended to expedite development and review, such as priority review and accelerated approval. A product is eligible for priority review if it has the potential to provide safe and effective therapy for a serious condition where no satisfactory alternative therapy exists or a significant improvement in the treatment, diagnosis or prevention of a serious condition compared to marketed products. The FDA will attempt to direct additional resources to the evaluation of an application for a new drug designated for priority review in an effort to facilitate the review.

In addition, a product may be eligible for accelerated approval. Drug products intended to treat serious or life-threatening diseases or conditions may be eligible for accelerated approval upon a determination that the product has an effect on 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. As a condition of approval, the FDA may require that a sponsor of a drug receiving accelerated approval perform adequate and well-controlled post-marketing clinical trials. In addition, the FDA currently requires as a condition for accelerated approval pre-approval of promotional materials, which could adversely impact the timing of the commercial launch of the product. Fast track designation, priority review and accelerated approval do not change the standards for approval but may expedite the development or approval process.

A sponsor may seek FDA designation of a drug candidate as a “breakthrough therapy” if the drug 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. The designation includes intensive FDA interaction and guidance. If a drug is designated as breakthrough therapy, the FDA will expedite the development and review of such drug. Breakthrough therapy designation includes all of the fast track program features, as well as more intensive FDA interaction and guidance. The breakthrough therapy designation is a distinct status from both accelerated approval and priority review, which can also be granted to the same drug if relevant criteria are met. If a product is designated as breakthrough therapy, the FDA will work to expedite the development and review of such drug.

Even if a product qualifies for one or more of these programs, the FDA may later decide that the product no longer meets the conditions for qualification or decide that the time period for FDA review or approval will not be shortened. In addition, this designation may not provide a material commercial advantage.

Any drug products for which we receive FDA approvals are subject to continuing regulation by the FDA, including, among other things, record-keeping requirements, reporting of adverse experiences with the product, providing the FDA with updated safety and efficacy information, product sampling and distribution requirements, and complying with FDA promotion and advertising requirements, which include, among others, standards for direct-to-consumer advertising, restrictions on promoting drugs for uses or in patient populations that are not described in the drug’s approved labeling (known as “off-label use”), limitations on industry-sponsored scientific and educational activities, and requirements for 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.

In addition, quality control and manufacturing procedures must continue to conform to applicable manufacturing requirements after approval to ensure the long term stability of the drug product. We rely, and expect to continue to rely, on third parties for the production of clinical and commercial quantities of our products in accordance with cGMP regulations. cGMP regulations require among other things, quality control and quality assurance as well as the corresponding maintenance of records and documentation and the obligation to investigate and correct any deviations from cGMP. Drug manufacturers and other entities involved in the manufacture and distribution of approved drugs are required to register their establishments with the FDA and certain state agencies, and are subject to periodic unannounced inspections by the FDA and certain state agencies for compliance with cGMP and other laws. Accordingly, manufacturers must continue to expend time, money, and effort in the area of production and quality control to maintain cGMP compliance. Discovery of problems with a product after approval may result in restrictions on a product, manufacturer, or holder of an approved NDA, including, among other things, recall or withdrawal of the product from the market. In addition, changes to the manufacturing process are strictly regulated, and depending on the significance of the change, may require prior FDA approval before being implemented. Other types of changes to the approved product, such as adding new indications and additional labeling claims, are also subject to further FDA review and approval.

The FDA also may require post-marketing testing, known as Phase 4 testing, and surveillance to monitor the effects of an approved product. Discovery of previously unknown problems with a product or the failure to comply with applicable FDA requirements can have negative consequences, including adverse publicity, judicial or administrative enforcement, warning letters from the FDA, mandated corrective advertising or communications with doctors, and civil or criminal penalties, among others. Newly discovered or developed safety or effectiveness data may require changes to a product’s approved labeling, including the addition of new warnings and contraindications, and also may require the implementation of other risk management measures. Also, new government requirements, including those resulting from new legislation, may be established, or the FDA’s policies may change, which could delay or prevent regulatory approval of our products under development.

Depending upon the timing, duration and specifics of the FDA approval of the use of our product candidates, some of our U.S. patents, if granted, may be eligible for limited patent term extension under the Drug Price Competition and Patent Term Restoration Act of 1984, commonly referred to as the Hatch-Waxman Amendments. The Hatch-Waxman Amendments permit a patent restoration term of up to five years, as compensation for patent term lost during product development and the FDA regulatory review process. However, patent term restoration cannot extend the remaining term of a patent beyond a total of 14 years from the product’s approval date. The patent term restoration period is generally one-half the time between the effective date of an IND and the submission date of an NDA plus the time between the submission date of an NDA and the approval of that application. Only one patent applicable to an approved drug is eligible for the extension and the application for the extension must be submitted prior to the expiration of the patent. The U.S. Patent and Trademark Office, in consultation with the FDA, reviews and approves the application for any patent term extension or restoration. In the future, we may intend to apply for restoration of patent term for one of our

currently owned or licensed patents to add patent life beyond its current expiration date, depending on the expected length of the clinical trials and other factors involved in the filing of the relevant NDA.

Market exclusivity provisions under the FDCA can also delay the submission or the approval of certain marketing applications. The FDCA provides a five-year period of non-patent marketing exclusivity within the United States to the first applicant to obtain approval of an NDA for a new chemical entity. A drug is a new chemical entity if the FDA has not previously approved any other new drug containing the same active moiety, which is the molecule or ion responsible for the action of the drug substance. During the exclusivity period, the FDA may not approve or even accept for review an abbreviated new drug application, or ANDA, or a 505(b)(2) NDA submitted by another company for another drug based on the same active moiety, regardless of whether the drug is intended for the same indication as the original innovative drug or for another indication, where the applicant does not own or have a legal right of reference to all the data required for approval. However, an application may be submitted after four years if it contains a certification of patent invalidity or non-infringement to one of the patents listed with the FDA by the innovator NDA holder. The FDCA alternatively provides three years of marketing exclusivity for an NDA, or supplement to an existing NDA if new clinical investigations, other than bioavailability studies, that were conducted or sponsored by the applicant are deemed by the FDA to be essential to the approval of the application, for example new indications, dosages or strengths of an existing drug. This three-year exclusivity covers only the modification for which the drug received approval on the basis of the new clinical investigations and does not prohibit the FDA from approving ANDAs for drugs containing the active agent for the original indication or condition of use. Five-year and three-year exclusivity will not delay the submission or approval of a full NDA. However, an applicant submitting a full NDA would be required to conduct or obtain a right of reference to all of the preclinical studies and adequate and well-controlled clinical trials necessary to demonstrate safety and effectiveness.

Orphan drug exclusivity, as described above, may offer a seven-year period of marketing exclusivity, except in certain circumstances. Pediatric exclusivity is another type of non-patent market exclusivity in the United States. Pediatric exclusivity, if granted, adds six months to existing exclusivity periods and patent terms. This six-month exclusivity, which runs from the end of other exclusivity protection or patent term, may be granted based on the voluntary completion of a pediatric trial in accordance with an FDA-issued “Written Request” for such a trial.

Although we currently do not have any products on the market, we are and, upon approval and commercialization, will be subject to additional healthcare regulation and enforcement by the federal government and by authorities in the states and foreign jurisdictions in which we conduct our business. In the United States, such laws include, without limitation, state and federal anti-kickback, fraud and abuse, false claims, privacy and security, price reporting, and physician sunsh



Title of Each Class of Securities to be Registered	Amount to be Registered⁽¹⁾	Proposed Maximum Offering Price Per Share⁽²⁾	Proposed Maximum Aggregate Offering Price⁽¹⁾⁽²⁾	Amount of Registration Fee
Common stock, par value $0.0001 per share	2,760,000	$23.03	$63,562,800	$8,251


	Per Share	Total
Public Offering Price	$	$
Underwriting Discount⁽¹⁾	$	$
Proceeds to Mirum Pharmaceuticals, Inc. (before expenses)	$	$


	Page
PROSPECTUS SUMMARY		1
RISK FACTORS		11
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS		66
MARKET, INDUSTRY AND OTHER DATA		67
USE OF PROCEEDS		68
DIVIDEND POLICY		69
CAPITALIZATION		70
DILUTION		72
SELECTED CONSOLIDATED FINANCIAL DATA		74
MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS		76
BUSINESS		87
MANAGEMENT		136
EXECUTIVE COMPENSATION		145
CERTAIN RELATIONSHIPS AND RELATED PERSON TRANSACTIONS		156
PRINCIPAL STOCKHOLDERS		160
DESCRIPTION OF CAPITAL STOCK		163
SHARES ELIGIBLE FOR FUTURE SALE		167
MATERIAL UNITED STATES FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. HOLDERS		169
UNDERWRITING		173
LEGAL MATTERS		178
EXPERTS		178
WHERE YOU CAN FIND ADDITIONAL INFORMATION		178
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS		F-1


	As of December 31, 2018			As of September 30, 2019
	(in thousands)			(in thousands)
				(unaudited)
Consolidated Balance Sheets Data:
Cash, cash equivalents and investments	$	51,963		$	153,559
Working capital⁽¹⁾		49,526			118,408
Total assets		51,975			158,273
Series A redeemable convertible preferred stock⁽²⁾		59,849			—
Total stockholders’ (deficit) equity		(17,313	)		146,203


	Period from May 2, 2018 to December 31, 2018
Net cash used in operating activities	$	(373	)
Net cash used in investing activities		(7,500	)
Net cash provided by financing activities		59,836
Net increase (decrease) in cash and cash equivalents		51,963



Large accelerated filer	☐	Accelerated filer	☐

Non-accelerated filer	☒	Smaller reporting company	☒

		Emerging growth company	☒


	As of September 30, 2019
	Actual			As Adjusted
	(in thousands, except share and per share amounts) (unaudited)
Cash, cash equivalents and investments	$	153,559		$	205,015

Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized, no shares issued and outstanding, actual, and 10,000,000 shares authorized, no shares issued and outstanding, as adjusted		—			—
Common stock, $0.0001 par value; 200,000,000 shares authorized, 22,989,987 shares issued and 22,566,940 outstanding, excluding 423,047 shares subject to repurchase, actual; 200,000,000 shares authorized, 25,389,987 shares issued and 24,966,940 shares outstanding, excluding 423,047 shares subject to repurchase, as adjusted		2			2
Additional paid-in capital		198,052			249,508
Accumulated deficit		(51,949	)		(51,949	)
Accumulated other comprehensive income		98			98

Total stockholders’ equity	$	146,203		$	197,659

Total capitalization	$	146,203		$	197,659


Assumed public offering price per share			$	23.03
Historical net tangible book value per share as of September 30, 2019	$	6.36
Increase in net tangible book value per share attributable to investors purchasing shares in this offering		1.43

As adjusted net tangible book value per share after this offering				7.79

Dilution in as adjusted net tangible book value per share to investors purchasing shares in this offering			$	15.24


	Period from May 2, 2018 to December 31, 2018			Period from May 2, 2018 to September 30, 2018			Nine Months Ended September 30, 2019
	(in thousands, except share and per share data)			(in thousands, except share and per share data) (unaudited)
Consolidated Statements of Operations Data:
Operating expenses:
Research and development	$	2,331		$	3		$	28,611
In process research and development		14,490			—			—
General and administrative		585			72			7,474

Total operating expenses		17,406			75			36,085

Loss from operations		(17,406	)		(75	)		(36,085	)
Other income (expense), net		58			(2	)		1,484

Net loss	$	(17,348	)	$	(77	)	$	(34,601	)

Net loss per share, basic and diluted⁽¹⁾	$	(19.29	)	$	(0.26	)	$	(4.47	)

Weighted-average shares of common stock outstanding, basic and diluted⁽²⁾		899,331			290,570			7,745,241


	Three Months Ended September 30,			Three Months Ended September 30,
	2019			2018			Change
Operating expenses:
Research and development	$	12,159		$	3		$	12,156
General and administrative		3,708			62			3,646

Total operating expenses		15,867			65			15,802

Loss from operations		(15,867	)		(65	)		(15,802	)
Interest income (expense)		785			(2	)		787
Other income (expense), net		(5	)		—			(5	)

Net loss	$	(15,087	)	$	(67	)	$	(15,020	)


	Nine Months Ended September 30,			Period from May 2, 2018 to September 30,
	2019			2018			Change
Operating expenses:
Research and development	$	28,611		$	3		$	28,608
General and administrative		7,474			72			7,402

Total operating expenses		36,085			75			36,010

Loss from operations		(36,085	)		(75	)		(36,010	)
Interest income (expense)		1,485			(2	)		1,487
Other income (expense), net		(1	)		—			(1	)

Net loss	$	(34,601	)	$	(77	)	$	(34,524	)


	Period from May 2, 2018 to December 31, 2018
Operating expenses:
Research and development	$	2,331
In process research and development	$	14,490
General and administrative		585

Total operating expenses		17,406

Loss from operations		(17,406	)
Other income (expense), net		58

Net loss and comprehensive loss	$	(17,348	)


	Nine Months Ended September 30,			Period from May 2, 2018 to September 30,
	2019			2018
Net cash used in operating activities	$	(25,664	)	$	(19	)
Net cash used in investing activities		(122,637	)		—
Net cash provided by financing activities		127,177			51
Effect of exchange rate on cash and cash equivalents		(25	)		—

Net (decrease) increase in cash and cash equivalents	$	(21,149	)	$	32


	Payments due by period
	Total		Less than 1 year		1—3 Years		3—5 Years		More than 5 years
Operating lease obligations⁽¹⁾⁽²⁾	$	1,683	$	433	$	903	$	347	$	—


Trial	Objectives	Observations
PFIC2
INDIGO (N=33)
• Phase 2 open-label, dose-escalation trial • Fully-enrolled • Open-label extension ongoing	• Evaluate safety and efficacy in PFIC • Endpoints: Safety, pruritus and sBA	Pruritus
		• Disappearance or substantial reduction in pruritus in PFIC2 patients; see “—Our Clinical Trials of Maralixibat in PFIC—Phase 2 INDIGO Trial” below • 55% of PFIC2 patients experienced a ³1 point ItchRO(Obs) reduction at week 48
		Serum Bile Acid
		• Normalization or substantial reduction observed in sBA levels in PFIC2 patients • Primary efficacy analysis of the change from baseline to week 13 in fasting sBA level did not reach statistical significance for the overall group
		Others
		• Improvement in height and weight • Normalization of bilirubin and liver enzymes, if elevated at baseline • Improvements observed in health-related quality of life scores • Well tolerated. Many patients on treatment for approximately 4 years. Most frequent adverse events gastrointestinal-related


Citigroup		Evercore ISI		Guggenheim Securities


Raymond James		Roth Capital Partners


	ITCH MRX Week 13			ITCH PBO Week 13			IMAGO MRX Week 13			IMAGO PBO Week 13
MRX (µg/kg QD)		140/280			0			140/280			0
Change from Baseline ItchRO(Obs)		-1.19			-0.58			-0.61			-0.59
% Change from Baseline ItchRO(Obs)		-39	%		-21	%		-22	%		-19	%