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Assembly Biosciences, Inc.

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FY2023 Annual Report · Assembly Biosciences, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM 10-K

☒

☐

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

For the fiscal year ended December 31, 2023
or

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

For the Transition Period from __________ to __________

Commission File Number: 001-35005
ASSEMBLY BIOSCIENCES, INC.
(Exact name of registrant specified in its charter)

Delaware
(State or Other Jurisdiction of
Incorporation or Organization)

20-8729264
(I.R.S. Employer
Identification No.)

Two Tower Place, 7th Floor
South San Francisco, California 94080
(Address of Principal Executive Offices)

Registrant’s telephone number, including area code: (833) 509-4583

Securities Registered Pursuant to Section 12(b) of the Exchange Act:

Title of Each Class
Common Stock, $0.001 Par Value

Trading Symbol(s)
ASMB

Name of Exchange on which Registered
The Nasdaq Global Select Market

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

Securities Registered Pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. Yes   ☐   No   ☒
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for 
such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes   ☒   No   ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) 
during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes   ☒   No   ☐
Indicate  by  check  mark  whether  the  registrant  is  a  large  accelerated  filer,  an  accelerated  filer,  a  non-accelerated  filer,  a  smaller  reporting  company,  or  an  emerging  growth  company.  See  the 
definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

Non-accelerated filer

☐  

☒  

Accelerated filer

Smaller reporting company

Emerging growth company

☐

☒

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards 
provided pursuant to Section 13(a) of the Exchange Act. ☐
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 
404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262 (b)) by the registered public accounting firm that prepared or issued its audit report. ☐
If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to 
previously issued financial statements. ☐
Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive 
officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes   ☐   No     ☒
The aggregate market value of the voting stock held by non-affiliates of the registrant, as of June 30, 2023, was $60.0 million. Such aggregate market value was computed by reference to the 
closing price of the common stock as reported on the Nasdaq Global Select Market on June 30, 2023. For purposes of making this calculation only, the registrant has defined affiliates as including 
only (1) directors, (2) executive officers and (3) certain stockholders, if any, that hold greater than 10% of the voting stock of the registrant, in each case, as of June 30, 2023. Shares of common 
stock held by other persons, including certain other holders of more than 10% of the registrant’s outstanding common stock, if any, have not been excluded from the above calculation in that such 
persons are not deemed to be affiliates. The determination of affiliate status is not necessarily a conclusive determination for other purposes.
As of March 22, 2024, there were 5,482,752 shares of the registrant’s common stock, $0.001 par value per share, outstanding.
DOCUMENTS INCORPORATED BY REFERENCE
Part III of this Annual Report on Form 10-K incorporates information by reference to portions of the definitive proxy statement for the Company’s Annual Meeting of Stockholders to be held in 
2024, to be filed within 120 days of the registrant’s fiscal year ended December 31, 2023.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ASSEMBLY BIOSCIENCES, INC.
TABLE OF CONTENTS

Business
Risk Factors
Unresolved Staff Comments
Cybersecurity
Properties
Legal Proceedings
Mine Safety Disclosures

PART I
Item 1.
Item 1A.
Item 1B.
Item 1C.
Item 2.
Item 3.
Item 4.
PART II
Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.
Item 9C.
PART III
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.
Item 15.
Item 16.
Financial Statements

Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
[Reserved]
Management’s Discussion and Analysis of Financial Condition and Results of Operations
Quantitative and Qualitative Disclosures about Market Risk
Financial Statements and Supplementary Data
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
Controls and Procedures
Other Information
Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Directors, Executive Officers and Corporate Governance
Executive Compensation
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Certain Relationships and Related Transactions, and Director Independence
Principal Accountant Fees and Services
Exhibits, Financial Statement Schedules
Form 10-K Summary

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F-1

 
 
 
 
 
 
 
 
 
 
 
References to Assembly Biosciences, Inc.

Throughout this Annual Report on Form 10-K, the “Company,” “Assembly Bio,” “Assembly,” “we,” “us,” and “our,” except where the context requires 
otherwise, refer to Assembly Biosciences, Inc. and its consolidated subsidiaries, and “our board of directors” or “the Board” refers to the board of directors 
of Assembly Biosciences, Inc.

Forward-Looking Statements

This Annual Report on Form 10-K contains “forward-looking statements” that are subject to certain risks and uncertainties, including, without limitation,
those set forth in Part I, Item 1A under the heading “Risk Factors,” that could cause actual results to materially differ. Such risks and uncertainties include, 
among other things:

•

•

•

•

•

our  ability  to  realize  the  potential  benefits  of  our  collaboration  with  Gilead  Sciences,  Inc.  (Gilead),  including  all  financial  aspects  of  the 
collaboration and equity investments;

our  ability  to  initiate  and  complete  clinical  studies  involving  our  therapeutic  product  candidates,  including  studies  contemplated  by  our 
collaboration with Gilead, in the currently anticipated timeframes or at all;

safety and efficacy data from clinical or nonclinical studies may not warrant further development of our product candidates;

clinical and nonclinical data presented at conferences may not differentiate our product candidates from other companies’ candidates; and

results of nonclinical studies may not be representative of disease behavior in a clinical setting and may not be predictive of the outcomes of 
clinical studies.

You are urged to consider statements that include the words may, will, would, could, should, might, believes, hopes, estimates, projects, potential, expects, 
plans,  anticipates,  intends,  continues,  forecast,  designed,  goal  or  the  negative  of  those  words  or  other  comparable  words  to  be  uncertain  and  forward-
looking.  In  particular,  forward-looking  statements  include,  but  are  not  limited  to,  statements  regarding  the  timing  of  commencement  of  future  clinical 
studies  involving  our  therapeutic  product  candidates;  and  our  ability  to  successfully  complete,  and  receive  favorable  results  in,  clinical  studies  for  our 
product candidates. We intend such forward-looking statements to be covered by the safe harbor provisions contained in Section 27A of the Securities Act 
of 1933, as amended (the Securities Act), and Section 21E of the Securities Exchange Act of 1934, as amended (the Exchange Act). Except as required by 
law, we assume no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

ii

 
PART I

Item 1. Business

Overview

We  are  a  biotechnology  company  developing  innovative  therapeutics  targeting  serious  viral  diseases  with  the  potential  to  improve  the  lives  of  patients 
worldwide.  Our  pipeline  includes  two  helicase-primase  inhibitors  (HPI)  targeting  recurrent  genital  herpes,  an  orally  bioavailable  hepatitis  delta  virus 
(HDV) entry inhibitor, a clinical stage capsid assembly modulator (CAM) designed to disrupt the replication cycle of hepatitis B virus (HBV) at several key 
points with the aim of achieving finite treatment and functional cures and research programs focused on the discovery of therapeutics to treat devastating 
viral diseases, including a non-nucleoside polymerase inhibitor (NNPI) targeting transplant-related herpesviruses and a small molecule interferon-α (IFN-α) 
receptor (IFNAR) agonist targeting HBV and HDV.

Our Strategy

Our current business strategy is to apply our deep research and development expertise in virology to bring next-generation therapeutics to patients with 
serious viral diseases:

•

•

•

•

Recurrent  Genital  Herpes  (HSV-1,  HSV-2)  –  Advancing  two  investigational  long-acting  HPI  candidates,  (1)  ABI-5366  (5366)  and  (2) 
ABI-1179 (1179), through Clinical Trial Application (CTA)-enabling studies and into a Phase 1a/1b clinical study in 2024.

HDV – Advancing an orally bioavailable HDV entry inhibitor, ABI-6250 (6250), through CTA-enabling studies and into Phase 1a clinical 
studies in 2024.

Highly Potent Next-Generation HBV Capsid Assembly Modulator – Advancing our novel next-generation CAM, ABI-4334 (4334), into 
Phase 1b clinical studies in 2024.

Novel  Small  Molecule  Approaches  for  Transplant-Associated  Herpesviruses,  HBV  and  HDV  –  Research  programs  focused  on 
advancing  an  oral  NNPI  targeting  transplant-associated  herpesviruses  and  a  small  molecule,  IFNAR  agonist  targeting  HBV  and  HDV 
towards selection of a development candidate.

We have recruited an accomplished leadership team and research and development organization, with a collective team track record of over 15 approved 
drugs in viral diseases, including hepatitis. Our collaboration with Gilead Sciences, Inc. (Gilead and the Gilead Collaboration) also brings us an industry 
leading  partner  with  a  shared  vision  of  providing  differentiated  antiviral  treatments  to  patients.  For  additional  information  regarding  the  Gilead 
Collaboration, see “Collaboration and License Agreements—Gilead Sciences, Inc.”

Development Pipeline Strategy

In  addition  to  the  investigational  programs  that  comprise  our  current  pipeline,  we  will  continue  leveraging  the  expertise  of  our  strong  research  team  to 
identify new viral targets and novel compounds to address significant unmet medical needs. 

Our Clinical Programs and CTA-Enabling Programs

Recurrent Genital Herpes/HSV-1 and HSV-2

In August 2022, we introduced our first programs outside of hepatitis. Among our new viral targets is recurrent genital herpes. Genital herpes can be caused 
by either herpes simplex virus type 1 (HSV-1) or herpes simplex virus type 2 (HSV-2). HSV-1 and HSV-2 are acquired by oral or genital contact either 
during symptomatic or asymptomatic reactivation of the virus. Both viruses replicate in neurons, where they can remain latent for the rest of the patient’s 
life and periodically reactivate, with the virus spreading and replicating in epithelial tissues. Initial infection can be asymptomatic or can be marked by 
symptoms,  including  localized  pain  and  painful  lesions.  Genital  herpes  recurrence  is  common  and  can  cause  painful  genital  lesions  that  can  lead  to 
increased  transmission  and  debilitate  patients,  and  symptoms  may  become  more  serious  with  additional  episodes.  Additional  complications  include 
increased risk of HIV infection, as well as associated psychological stress and isolationary thoughts, depression and suicidal ideation. 

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Immunocompromised patients may experience more severe and prolonged symptoms due to increased recurrence rates. While genital herpes can be caused 
by either HSV-1 or HSV-2, recurrences are more likely to be experienced by patients infected by HSV-2. 

There are an estimated 800 million people globally with HSV-2, with an estimated 32 million in the United States and 31 million in France, Germany, Italy 
and  Spain  (collectively,  the  EU4)  and  the  United  Kingdom  (UK).  Only  approximately  13%  of  that  population  is  aware  of  the  infection  and  have  been 
diagnosed. Awareness and diagnostic rates are impacted due to asymptomatic infections and low screening rates in adults and adolescents due to high false 
positive rates with current diagnostic assays.

HPIs are antiviral agents in development for HSV-1 and HSV-2, with a clinically validated mechanism of action. HPIs inhibit the HSV helicase-primase 
complex, which is a unique viral enzyme complex without a human homolog, consisting of helicase, primase and cofactor subunits. Both of these subunits 
have functions that are essential for viral DNA replication and are conserved across HSV-1 and HSV-2. Unlike nucleoside analogs, these compounds do not 
require phosphorylation by the HSV thymidine kinase (TK) and ongoing viral replication to become active drugs. As a result, HPIs are active immediately 
upon  reactivation  of  latent  HSV-1  and  HSV-2.  Furthermore,  HPIs  are  active  against  TK-deficient  HSV-1  and  HSV-2,  which  is  a  major  mechanism  of 
resistance to nucleoside analogs. 

In February 2023, we announced the nomination of our first herpesvirus development candidate, 5366, a long-acting HPI for treatment of recurrent genital 
herpes, to progress toward CTA-enabling studies. In connection with the Gilead Collaboration, in October 2023, we acquired the rights to 1179, Gilead's 
HPI program, which is structurally differentiated from 5366.

Currently, there are three antiviral drugs (all nucleoside analogs) that have been approved in the United States and the EU4/UK for the treatment of genital 
herpes. No new drugs have been approved to treat genital herpes for more than 25 years. In addition to the approved nucleoside analogs, agents such as 
local anesthetics or analgesics may be used to alleviate local symptoms of minor pain and discomfort. 

Nucleoside analogs can be administered as episodic therapy as individual outbreaks arise or daily as chronic suppressive therapy for those with high post-
exposure recurrences. However, these agents are only partially effective at controlling the infection or reducing transmission risk. With current nucleoside 
analog therapies, only one out of three recurrent genital herpes patients with six or more recurrences per year are able to make it through a year of treatment 
without a recurrence. There are still high titer (greater than 104 HSV-2 DNA copies/mL) shedding episodes under this current standard of care for HSV-2, 
which can lead to recurrences and transmission of genital herpes.

Based on the limitations of current therapies, we see a path to advancing the treatment paradigm for patients suffering from recurrent genital herpes, To 
reach  that  goal,  we  identified  an  opportunity  to  develop  a  potent,  long-acting  HPI  for  recurrent  genital  herpes,  5366,  which  has  demonstrated  a  strong 
nonclinical  profile,  with  low  nanomolar  potency  in  vitro  against  both  HSV-1  and  HSV-2  clinical  isolates,  exceptionally  low  plasma  clearance  rates  in 
multiple nonclinical models and a projected human half-life of more than seven days. This nonclinical profile has led us to target 5366 for development as a 
long-acting treatment with the potential to be administered orally or as an injectable. 

To date, 5366 has also demonstrated a favorable nonclinical safety profile in Good Laboratory Practice (GLP) toxicology studies, with high safety margins 
and minimal potential for off-target effects.  At the International Herpesvirus Workshop in July 2023, we presented a nonclinical characterization of 5366 
for the treatment of recurrent genital herpes. We currently anticipate the initiation of clinical studies with 5366 by mid-2024.

In addition, we are also advancing 1179, a second, structurally-differentiated HPI with single digit nM potency against HSV-1 and HSV-2 and a nonclinical 
pharmacokinetics  (PK)  profile  strongly  supporting  a  potential  long-acting  treatment  by  oral  and  injectable  administration.  GLP  toxicology  studies  are 
underway and clinical studies are expected to begin by the end of 2024.

Our HBV and HDV Programs

The World Health Organization (WHO) estimates that 296 million people worldwide are chronically infected with HBV as of 2019, and 1.5 million new 
infections occur each year. HBV is a leading global cause of chronic liver disease and liver transplants, and the WHO estimates that 820,000 people died in 
2019 from HBV, mostly due to 

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cirrhosis  and  hepatocellular  carcinoma.  Of  the  296  million  people  living  with  chronic  HBV  infection,  only  approximately  30.4  million,  or  10.5%,  were 
aware of their infection, and only approximately 6.6 million, or 22%, of those diagnosed received treatment. HBV is a highly prevalent disease that infects 
more than three times the number of people infected with hepatitis C virus and HIV infections combined, according to the WHO.

HDV is a “satellite virus,” because it can only infect people (1) who are already infected with HBV or (2) at the same time as a person is infected with 
HBV. HDV affects a subset of approximately 12 million HBV infected patients. These patients, which comprise an estimated 4.5% of hepatitis B surface 
antigen  (HBsAg)  positive  patients,  experience  a  substantially  increased  disease  burden,  as  they  account  for  18%  of  cirrhosis  and  20%  of  hepatocellular 
carcinoma  associated  with  HBV.  HDV  is  considered  the  most  severe  form  of  hepatitis,  as  70%  of  HDV  patients  progress  to  cirrhosis  within  ten  years. 
While HDV is less prevalent in the United States, it is a significant and serious health problem with inadequate treatment in many parts of Europe, Africa, 
the  Middle  East,  East  Asia  and  parts  of  South  America.  HDV  may  be  significantly  underdiagnosed,  because  there  were  no  HDV-targeted  therapies 
approved until very recently, and the first therapy approved is only approved in the European Union. HDV is known to accelerate disease progression and 
increase the incidence of liver cirrhosis and liver cancer, which results in higher morbidity and mortality rates than HBV alone. 

The current standard of care for chronic HBV infection, nucleos(t)ide analog reverse transcriptase inhibitors (NrtIs), are taken life-long and reduce, but do 
not eliminate, the virus and result in very low cure rates. No new mechanisms of action (MOA) have been approved for chronic HBV infection in over 25 
years. The focus of our HBV program is to improve outcomes and increase the number of patients diagnosed and treated through the development of finite 
and curative therapies targeting an orthogonal MOA.

The current standard of care treatment for HDV is off-label pegylated IFN-α injected weekly or, in some regions, a large, complex molecule that requires 
daily injections. There are no approved HDV treatments in the United States, and there is only one approved HDV treatment in Europe. We believe a safe 
and effective oral small molecule entry inhibitor would be a significant innovation for patients living with HDV, which face a significant and immediate 
disease burden.

HDV Entry Inhibitor

HDV is a small RNA virus that encodes just two viral proteins and relies on host enzymes as well as the HBsAg from HBV to replicate, which limits the 
number  of  HDV-specific  antiviral  targets.    Similar  to  HBV,  HDV  utilizes  HBsAg  to  enter  hepatocytes  by  binding  the  cellular  transmembrane  protein 
sodium taurocholate co-transporting peptide (NTCP). NTCP is highly expressed on human hepatocytes, where it serves as one of several proteins involved 
in the transport of bile acids. The binding of specific small or large molecules to NTCP has been shown to effectively inhibit the interaction of HBsAg with 
NTCP, which prevents HBV and HDV from infecting hepatocytes.  

The  inhibition  of  HBV  and  HDV  infection  by  molecules  that  bind  NTCP  has  been  demonstrated  in  vitro,  in  animal  models  and  clinically.  Notably, 
Bulevirtide, a peptide blocker of NTCP, is the only approved therapy for HDV (approved in the European Union (the EU). The binding of NTCP-targeted 
HBV/HDV entry inhibitors to NTCP has also been shown to inhibit the transport of certain bile acids into cells, which results in plasma elevations of bile 
acids; this effect has been well tolerated clinically and may serve as a biomarker of pharmacologically active concentrations of drug in the plasma. 

We believe a safe and effective oral small molecule entry inhibitor would be a significant innovation for patients living with HDV and could significantly 
improve treatment uptake and diagnosis rates, especially when compared with currently available injectable products.

In March 2022, we announced our research program focused on a novel, orally bioavailable small molecule approach to inhibit entry of HBV and HDV by 
targeting  NTCP,  and  in  September  2023,  we  nominated  6250.  In  nonclinical  studies,  6250  demonstrated  low  nanomolar  potency  against  all  HBV/HDV 
genotypes, favorable selectivity for NTCP versus other bile acid transporters, good oral bioavailability and a PK profile in nonclinical species projected to 
support once-daily oral dosing.

At the European Association for the Study of the Liver’s (EASL) International Liver CongressTM in June 2023 (EASL 2023) and the International HBV 
Meeting in September 2023, we presented nonclinical characterization of the 

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potencies and properties of our novel class of highly potent, small molecule, orally-bioavailable entry inhibitors. We expect to initiate Phase 1a clinical 
studies of 6250 by the end of 2024.

Capsid Assembly Modulator

HBV is a DNA virus that infects hepatocytes and establishes a reservoir of covalently closed circular DNA (cccDNA), a unique viral DNA moiety that 
resides  in  the  nucleus  of  HBV-infected  hepatocytes  and  is  associated  with  viral  persistence  and  chronic  infection.  No  currently  approved  oral  therapies 
target  cccDNA  activity  directly,  which  makes  molecules  that  can  modulate  cccDNA  generation  or  disrupt  its  function.  As  a  result,  we  have  worked  to 
discover  and  develop  compounds  targeting  the  core  protein,  a  viral  protein  involved  in  numerous  aspects  of  the  HBV  replication  cycle,  including  the 
generation of HBV cccDNA. 

A benchmark for therapeutic agents aiming to decrease cccDNA levels is the use of several key viral antigens as surrogate biomarkers of active cccDNA. 
The same biomarkers can be used in both primary human hepatocytes and patients. On this basis, our next-generation CAM, 4334, has shown nonclinical 
proof  of  principle.  In  a  variety  of  cell  culture  models,  4334  has  demonstrated  the  ability  to  reduce  production  of  viral  HBV  DNA  levels  as  well  as  the 
surrogate markers for cccDNA establishment: HBV e antigen (HBeAg), HBV core-related antigen (HBcrAg) and viral pre-genomic RNA (pgRNA).

As a next-generation CAM, 4334 has been optimized to potently disrupt viral replication (MOA #1) and prevent the establishment and replenishment of 
new cccDNA (MOA #2). In contrast, while active against MOA #1, first-generation CAMs have not demonstrated adequate potency to sufficiently block 
cccDNA formation (MOA #2). Further, the current standard of care, NrtIs, impacts the viral life cycle after establishment of cccDNA and can only inhibit 
production  of  new  viral  particles,  and  it  does  so  incompletely.  In  mid-2021,  we  announced  the  selection  of  4334,  which  was  internally  discovered,  for 
clinical development. The chemical scaffold of 4334 is novel and distinct from all our prior CAM candidates. 

We believe that 4334 has a best-in-class nonclinical profile, with single-digit nanomolar potency against MOA #1 and MOA #2, pan-genotypic activity, an 
improved resistance profile and a favorable safety profile. Through mechanistic studies presented at multiple conferences, we have demonstrated that 4334 
promotes  the  formation  of  empty  capsids  by  acceleration  of  capsid  assembly,  prevents  the  formation  of  cccDNA  by  disrupting  incoming  capsids,  and 
prematurely disrupts capsids containing duplex linear DNA, the precursor for integrated HBV DNA. At the International HBV Meeting in September 2023, 
we presented nonclinical data demonstrating that 4334 impacts HBV DNA integration.

At EASL 2023, we presented safety and PK data from the Phase 1a study. Based on the PK data from the Phase 1a cohorts, plasma trough concentrations 
(Cmin) were in multiple-fold excess of the in vitro EC50 values for the inhibition of HBV DNA and cccDNA formation at all doses. These data indicate that 
4334 has the potential to provide potent inhibition of HBV with once daily dosing, and potential best-in-class activity is projected, with a dose of 200 mg 
estimated to achieve 175× protein-adjusted EC50 (paEC50) for DNA replication inhibition and 34× paEC50 for the prevention of cccDNA formation.

Treatment-emergent adverse events (AEs) and laboratory abnormalities were mild to moderate, with the majority being mild, and there were no patterns of 
AEs or laboratory abnormalities noted to be associated with 4334 and no clinically significant electrocardiogram abnormalities were reported.

We expect to initiate Phase 1b clinical studies of 4334 by mid-2024.

Research Programs

Transplant-Associated Herpesviruses

In August 2022, in connection with our announcement of our HPI program, we also introduced our NNPI research program, targeting transplant-associated 
herpesviruses. In a transplant setting, when patients are experiencing immunosuppression, they are at high risk of uncontrolled viral replication and severe 
disease  brought  on  by  one  or  more  herpesviruses,  including  cytomegalovirus  (CMV),  HSV-1,  HSV-2  and  varicella  zoster  virus  (VZV).  Each  of  these 
herpesviruses are highly prevalent, as approximately (1) 60% of transplant patients are CMV-positive; (2) 60% 

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of  transplant  patients  are  HSV-positive;  and  (3)  80%  of  transplant  patients  are  VZV-positive.  These  viruses  establish  lifelong  latent  infections  and 
frequently reactivate in transplant patients due to the use of immunosuppressive drugs following the transplant. These uncontrolled viral infections increase 
the risk of severe disease and serious complications, including organ rejection, graft loss and death, and impacted approximately 60,000 patients in 2018 in 
the United States and EU4/UK.

While there are approved antivirals that are administered in a transplant setting. However, currently approved antivirals are not broad spectrum and pose the 
risk of potentially serious side effects and drug-drug interactions. As a result of these limitations, we identified an opportunity to develop an oral pan-herpes 
NNPI for these transplant-associated herpesvirus infections, which could greatly advance treatment. Our research team has discovered multiple chemical 
series  of  potent,  broad-spectrum  herpesvirus  polymerase  inhibitors.  In  addition,  Gilead  exclusively  licensed  us  its  NNPI  program,  and  we  believe  the 
combined effort will speed candidate nomination and enhance our chance of clinical success. 

IFNAR Agonist

In  July  2022,  we  introduced  our  new  research  program  advancing  a  novel,  small  molecule  IFNAR  agonist  designed  to  selectively  activate  the  IFN-α 
pathway within the liver and offer the convenience of oral dosing. IFN-α is a subcutaneous injectable immune modulatory therapy approved for HBV that 
has demonstrated functional cure in some HBV patients, but its poor tolerability profile significantly limits its use. Substantial side effects include flu-like 
symptoms, cytopenias, serious depression and psychiatric effects. In addition, multiple contraindications limit its use, and it requires weekly injections that 
result in systemic exposure for up to a year. 

By  focusing  exposure  on  the  liver,  our  investigational  IFNAR  agonist  program  aims  to  engage  IFN-α’s  validated  antiviral  and  immune  modulatory 
mechanisms, retaining the efficacy of IFN-α while reducing systemic exposure to improve tolerability. At the American Association for the Study of Liver 
Diseases’  (AASLD)  The  Liver  Meeting®  in  November  2022  (AASLD  2022)  and  the  International  HBV  Meeting  in  September  2023,  we  presented  the 
nonclinical characterization of our novel liver-focused small molecule agonists efficiently inhibiting HBV by activating type 1 interferon signaling, and we 
presented additional nonclinical data at AASLD's The Liver Meeting® in November 2023. Lead optimization of multiple IFNAR agonists is in progress.

Collaboration and License Agreements

Gilead Sciences, Inc.

On  October  15,  2023,  we  entered  into  an  Option,  License  and  Collaboration  agreement  (the  Gilead  Collaboration  Agreement)  with  Gilead  pursuant  to 
which Gilead (1) exclusively licensed to us its HPI program and its NNPI program, while retaining opt-in rights to these programs and (2) has an option to 
take an exclusive license, on a program-by-program basis, to all of our other current and future pipeline programs. During the 12-year collaboration term 
(subject to payment of certain extension fees) and for a specified period thereafter, Gilead may exercise its opt-in rights, on a program-by-program basis, at 
one of two timepoints—completion of a certain Phase 1 study or completion of a certain Phase 2 study for the first product within the program—upon 
payment of an opt-in fee ranging from $45.0 million to $125.0 million per program depending on the type of program and when the option is exercised. 
Pursuant to the Gilead Collaboration Agreement, Gilead made an $84.8 million upfront cash payment to us. 

If  Gilead  exercises  its  opt-in  right  to  any  current  or  future  program  under  the  collaboration,  we  are  eligible  to  receive  up  to  $330.0  million  in  potential 
regulatory and commercial milestones on that program, in addition to royalties ranging from the high single-digits to high teens, depending on the clinical 
stage  of  the  program  at  the  time  of  the  opt-in.  Following  Gilead’s  exercise  of  its  option  for  each  of  our  programs,  we  may  opt  in  to  cover  40%  of  the 
research and development costs in the United States and share 40% of the profits and operating loss in the United States for products within the program in 
lieu of receiving milestones and royalties for that program in the United States, unless we later opt out of the cost/profit share for the program. Prior to 
Gilead’s potential exercise of its opt-in, we will be primarily responsible for all discovery, research and development on both our programs and the two 
Gilead-contributed programs. Following Gilead’s opt-in, Gilead will control the further discovery, research, development, and commercialization on any 
optioned programs. During the term, Gilead will continue to support the collaboration through extension fees of $75.0 million in each of the third, fifth and 
seventh years of the collaboration.

5

 
The Gilead Collaboration Agreement is subject to termination by either party for the other party’s uncured, material breach or insolvency. Subject to certain 
limitations, we and Gilead both have certain termination for convenience rights, upon sufficient prior written notice, with respect to programs that one party 
in-licenses  from  the  other  (subject  to  Gilead’s  option  rights),  and  with  respect  to  Gilead,  for  programs  it  has  option  rights  to  subject  to  certain  time 
limitations  with  respect  to  existing  Company  programs).  Gilead  also  has  a  right  to  terminate  the  collaborative  activities  under  the  Gilead  Collaboration 
Agreement at certain specified points during the collaboration term. Other customary termination rights are further provided in the Gilead Collaboration 
Agreement.

We  and  Gilead  also  entered  into  a  Common  Stock  Purchase  Agreement  and  an  Investor  Rights  Agreement  (together,  the  Gilead  Equity  Agreements), 
pursuant to which Gilead made an upfront equity investment of $15.2 million by purchasing from us 1,089,472 shares of our common stock at a purchase 
price of $13.92 per share. If we complete an equity financing (or series of financings) by July 15, 2024 that results in at least $30 million of proceeds to us, 
then, subject to approval by our stockholders (which was obtained on January 31, 2024), we may require Gilead to purchase additional shares of common 
stock from us in an amount that results in Gilead owning 29.9% of our then-outstanding voting capital stock. If we do not complete the equity financing or 
do not require Gilead to purchase the additional shares, Gilead may elect to purchase additional shares of common stock from us in an amount that results 
in Gilead owning 29.9% of our then-outstanding voting capital stock. The purchase price per share for additional shares purchased by Gilead will be equal 
to the lesser of (1) a 35% premium to the 30-day volume weighted average price immediately prior to the date of purchase or (2) a 35% premium to the 30-
day volume weighted average price immediately prior to delivery by Gilead of notice of the anticipated closing date. The Gilead Equity Agreements also 
include  a  three-year  standstill  provision  and  two-year  lockup  provision,  each  with  customary  exceptions,  and  provide  Gilead  with  certain  other  stock 
purchase rights and registration rights, as well as the right to designate two directors (or, alternatively, board observers at Gilead’s election) to our board of 
directors. In December 2023, Gilead designated Tomas Cihlar, Ph.D. to serve on our board of directors, and in March 2024, Gilead designated Robert D. 
Cook II to serve on our board of directors.

BeiGene, Ltd.

In July 2020, we entered into a Collaboration Agreement (the BeiGene Agreement) with BeiGene, Ltd. (BeiGene), granting BeiGene an exclusive, royalty-
bearing license to develop and commercialize products containing vebicorvir (VBR), ABI-H2158 (2158) and ABI-H3733 (3733) in the People’s Republic 
of China, Hong Kong, Taiwan and Macau (the Territory).

Under  the  BeiGene  Agreement,  we  and  BeiGene  will  collaborate  on  development  activities  with  respect  to  the  licensed  products  in  accordance  with  a 
mutually agreed upon development plan. 

Pursuant to the terms of the BeiGene Agreement, BeiGene paid us an upfront amount of $40.0 million, and we were eligible to receive up to approximately 
$500.0  million  in  milestone  payments,  comprised  of  up  to  $113.8  million  in  development  and  regulatory  and  $385.0  million  in  net  sales  milestone 
payments. In September 2021, we discontinued development of 2158 following the observation of elevated alanine transaminase (ALT) levels in the Phase 
2  clinical  study  consistent  with  drug-induced  hepatotoxicity,  in  July  2022,  we  discontinued  VBR  because  it  did  not  achieve  functional  cure  or  finite 
treatment in our two- and three-drug combination studies and in March 2023, we prioritized 4334 over 3733 based on data from clinical Phase 1 studies of 
both candidates and chronic toxicology observation for 3733 and announced that we would seek partnering opportunities for the CAMs. In conjunction 
with  the  Gilead  Collaboration  Agreement,  we  elected  to  no  longer  seek  partnering  or  further  development  of  3733.  As  of  our  discontinuation  of  3733 
development, there are no remaining products in development that have been licensed to BeiGene. 

The  BeiGene  Agreement  also  contains  provisions  such  as  representations  and  warranties  of  the  parties,  terms  as  to  governance  of  the  collaboration, 
commercialization and regulatory responsibilities of the parties, and manufacturing and supply, including potential adjustments in the event supply costs 
exceed certain levels. In addition, during the term of the BeiGene Agreement, neither party will commercialize any competing products in the Territory.

BeiGene may terminate the BeiGene Agreement for convenience at any time upon 90 days’ advance written notice to us. The BeiGene Agreement also 
contains customary provisions for termination by either party, including in the event of breach of the BeiGene Agreement, subject to cure.

6

 
Indiana University Research and Technology Corporation

In September 2013, we entered into an exclusive license agreement (the IURTC License Agreement) with Indiana University Research and Technology 
Corporation (IURTC) pursuant to which we acquired, with rights to sublicense, the rights to develop and commercialize products associated with multiple 
patents and patent applications covering aspects of our HBV program held by IURTC. As part of this agreement, we were obligated to make milestone 
payments based upon the successful accomplishment of clinical and regulatory milestones. The aggregate amount of all performance milestone payments 
under the IURTC License Agreement, should all performance milestones through development be met, was $0.8 million, with a portion related to the first 
performance milestone having been paid. Under the IURTC License Agreement, we were also obligated to pay IURTC royalties based on net sales of the 
licensed technology ranging from 0.5% to 1.75%. In addition, under the IURTC License Agreement, we paid annual diligence maintenance fees of $0.1 
million. Milestone payments received by IURTC were fully creditable against the annual diligence maintenance fee for the year in which the milestone 
payments were received.

In January 2024, we notified the Indiana University Innovation and Commercialization Office and IURTC that we had decided to terminate the IURTC 
License Agreement. The termination of the License Agreement will be effective on April 11, 2024, 90 days following the delivery of the termination notice.

Intellectual Property

We own a published international Patent Cooperation Treaty (PCT) patent application relating to compositions of matter and methods of using 5366 and 
derivatives/analogs  of  5366  to  treat  HSV.  Any  patents  issuing  from  this  application  are  expected  to  expire  in  2043.  We  also  own  a  published  PCT 
application relating to pharmaceutical formulations of 5366. Any patents issuing therefrom are expected to expire in 2043.

We have acquired rights to a published PCT patent application relating to compositions of matter and methods of using 1179 and derivatives/analogs of 
1179 to treat HSV. Any patents issuing from this application are expected to expire in 2043. We also have rights to provisional patent applications related to 
crystalline forms and pharmaceutical formulations of 1179. Any patents issuing therefrom are expected to expire in 2044 and 2045, respectively. 

We own an unpublished PCT patent application relating to compositions of matter and methods of using compound 6250 and derivatives/analogs of 6250 to 
treat HDV and HBV. Any patents issuing therefrom are expected to expire in 2044.

We own a published PCT patent application relating to compositions of matter and methods of using compound 4334 to treat HBV. Any patents issuing 
therefrom are expected to expire in 2041. We also own published PCT applications relating to processes for preparing 4334 and crystalline forms of 4334. 
Any patents issuing therefrom are expected to expire in 2042.

Finally, we own provisional, unpublished and published PCT patent applications relating to compositions of matter and method of using HDV/HBV entry 
inhibitors, IFNAR agonists and pan-herpes NNPIs.

Government 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,  manufacture,  including  any  manufacturing  changes,  packaging,  storage,  recordkeeping,  labeling,  advertising,  promotion, 
distribution, marketing, post-approval monitoring and reporting, import and export of pharmaceutical products, such as those we are developing.   

U.S. drug approval process

In  the  United  States,  the  FDA  regulates  drugs  under  the  Federal  Food,  Drug,  and  Cosmetic  Act  (FDCA)  and  implementing  regulations.  The  process  of 
obtaining  regulatory  approvals  and  subsequent  compliance  with  appropriate  federal,  state,  local  and  foreign  statutes  and  regulations  requires  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 or sponsor to a variety of administrative or judicial sanctions, such as the 
FDA’s refusal to approve pending applications, withdrawal of an approval, license revocation, imposition of a clinical hold, issuance of warning letters and 
untitled letters, product recalls, product seizures, total or 

7

 
partial suspension of production or distribution, injunctions, fines, refusals of government contracts, restitution, disgorgement of profits or civil or criminal 
penalties.

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

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•

•

•

•

•

•

•

•

•

completion  of  nonclinical  laboratory  tests  and  animal  studies  in  compliance  with  the  FDA’s  good  laboratory  practice  (GLP)  regulations  and 
applicable requirements for the humane use of laboratory animals or other applicable requirements;

submission to the FDA of an IND which must become effective before human clinical studies may begin;

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

performance  of  adequate  and  well-controlled  human  clinical  studies  in  accordance  with  good  clinical  practices  (GCP),  and  any  additional 
requirements for the protection of human research patients and their health information, to establish the safety and efficacy of the proposed drug 
for each indication;

submission to the FDA of a new drug application (NDA);

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

satisfactory completion of any potential FDA audits of the clinical trial sites that generated the data in support of the NDA to assure compliance 
with GCP requirements and integrity of the clinical data;

compliance with any post-approval requirements, including a risk evaluation and mitigation strategy, or REMS plan, where applicable, and post-
approval studies required by the FDA as a condition of approval;

FDA review and approval of the NDA; and

compliance  with  any  post-approval  requirements,  including  a  REMS,  where  applicable,  and  post-approval  studies  required  by  the  FDA  as  a 
condition of approval.

Nonclinical studies and IND

Nonclinical studies include laboratory evaluation of product chemistry and formulation, as well as in vitro and  animal  studies  to  assess  the  potential  for
adverse  events  and  in  some  cases  to  establish  a  rationale  for  therapeutic  use.  The  conduct  of  nonclinical  studies  is  subject  to  federal  regulations  and 
requirements,  including  GLP  regulations  for  safety/toxicology  studies.  An  IND  sponsor  must  submit  the  results  of  the  nonclinical  tests,  together  with 
manufacturing information, analytical data, any available clinical data or literature and plans for clinical studies, among other things, to the FDA as part of 
an  IND.  Some  long-term  nonclinical  testing,  such  as  animal  tests  of  reproductive  adverse  events  and  carcinogenicity,  may  continue  after  the  IND  is 
submitted. For some products, the FDA may waive the need for certain nonclinical tests. An IND automatically becomes effective 30 days after receipt by 
the FDA, unless before that time the FDA raises concerns or questions related to one or more proposed clinical studies and places the trial on clinical hold. 
If an IND or clinical study is placed on clinical hold, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical study can 
begin. As a result, submission of an IND may not result in the FDA allowing clinical studies to commence.

Clinical studies

Clinical studies involve the administration of the investigational new drug to human subjects under the supervision of qualified investigators in accordance 
with GCP requirements, which include, among other things, the requirement that all research subjects provide their informed consent in writing before their 
participation in any clinical study. Clinical studies are conducted under written study protocols detailing, among other things, the objectives of the study, the 

8

 
parameters to be used in monitoring safety, and the effectiveness criteria to be evaluated. A protocol for each clinical study and any subsequent protocol 
amendments must be submitted to the FDA as part of the IND. In addition, an IRB at each institution participating in the clinical study must review and 
approve the plan for any clinical study before it commences at that institution, and the IRB must conduct continuing review. The IRB must review and 
approve, among other things, the study protocol and informed consent information to be provided to study subjects. An IRB must operate in compliance 
with FDA regulations. Additionally, some clinical trials are overseen by an independent group of qualified experts organized by the clinical trial sponsor, 
known as a data safety monitoring board or committee. This group provides authorization for whether a trial may move forward at designated checkpoints 
based  on  access  to  certain  data  from  the  trial.  Information  about  certain  clinical  studies  must  be  submitted  within  specific  timeframes  to  the  National 
Institutes of Health for public dissemination at www.clinicaltrials.gov. The Food and Drug Omnibus Reform Act (FDORA), which was signed into law on 
December 29, 2022, made numerous amendments to the FDCA including provisions intended to, among other things, decentralize and modernize clinical 
trials and enhance diversity in clinical trial populations.

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

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Phase 1: The drug is initially introduced into healthy human subjects or patients with the target disease or condition and tested for safety, dosage 
tolerance, absorption, metabolism, distribution, excretion and, if possible, to gain an early indication of its effectiveness.

Phase 2: The drug is administered to a limited patient population to identify possible adverse effects and safety risks, to preliminarily evaluate 
the efficacy of the product for specific targeted diseases and to determine dosage tolerance and optimal dosage. Multiple Phase 2 clinical trials 
may be conducted to obtain information prior to beginning larger and more expensive Phase 3 clinical trials.

Phase 3: The drug is administered to an expanded patient population in adequate and well-controlled clinical studies to generate sufficient data to 
statistically confirm the efficacy and safety of the product for approval, to establish the overall risk-benefit profile of the product and to provide 
adequate information for the labeling of the product.

Progress  reports  detailing  the  results  of  the  clinical  studies  must  be  submitted  at  least  annually  to  the  FDA.  Additionally,  IND  safety  reports  must  be 
submitted to the FDA and the investigators within 15 calendar days after determining that the information qualifies for reporting. IND safety reports are 
required for serious and unexpected adverse reactions, findings from animal or in vitro testing or other studies that suggest a significant risk to humans, and 
any clinically important increase in the rate of a serious suspected adverse reaction over that listed in the protocol or investigator brochure. In addition, a 
sponsor must notify the FDA within seven calendar days after receiving information concerning any unexpected fatal or life-threatening suspected adverse 
reaction. Phase 1, Phase 2 and Phase 3 clinical studies may not be completed successfully within any specified period, or at all. Furthermore, the FDA or 
the sponsor may suspend or terminate a clinical study at any time on various grounds, including a finding that the research subjects are being exposed to an 
unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical study at its institution if the clinical study is not being conducted 
in accordance with the IRB’s requirements or if the drug has been associated with unexpected serious harm to patients.

A  manufacturer  of  an  investigational  drug  for  a  serious  disease  or  condition  is  required  to  make  available,  such  as  by  posting  on  its  website,  its  policy 
regarding evaluating and responding to requests for individual patient access to such investigational drug. This requirement applies on the earlier of the first 
initiation of a Phase 2 or Phase 3 trial of the investigational drug or, as applicable, 15 days after the drug receives a designation as a breakthrough therapy, 
Fast Track product, or regenerative advanced therapy. There also are requirements governing the reporting of ongoing clinical trials and completed clinical 
trial results to public registries.

Marketing approval

After the completion of required clinical testing, the results of the nonclinical studies and clinical studies, together with detailed information relating to the 
product’s chemistry, manufacture, controls and proposed labeling, among other things, are submitted to the FDA as part of an NDA requesting approval to 
market the product for one or more indications. Under federal law, the submission of most NDAs is additionally subject to a substantial application user 

9

 
fee, currently $4.0 million and the sponsor of an approved NDA is also subject to an annual program fee currently set at $0.42 million through September 
30, 2024. These fees are typically adjusted on October 1 each year.

The FDA conducts a preliminary review of all NDAs within the first 60 days after submission before accepting them for filing to determine whether they 
are sufficiently complete to permit substantive review. The FDA may request additional information rather than accept an NDA for filing. In this event, the 
application must be resubmitted with the additional information. The resubmitted application is also subject to review before the FDA accepts it for filing. 
Once  the  submission  is  accepted  for  filing,  the  FDA  begins  an  in-depth  substantive  review.  The  FDA  has  agreed  to  specified  performance  goals  in  the 
review of NDAs. Under these goals, the FDA has committed to review most original applications for non-priority products within ten months, and most 
original applications for priority review products, that is, drugs for a serious or life-threatening condition that the FDA determines represent a significant 
improvement over existing therapy, within six months. For NDAs for novel products, the ten- and six-month time periods runs from the filing date; for all 
other original applications, the ten- and six-month time periods run from the submission date. The review process may be extended by the FDA for three 
additional months to consider certain information or clarification regarding information already provided in the submission. Despite these review goals, it is 
not uncommon for FDA review of an NDA to extend beyond the goal date. The FDA may also refer applications for novel drugs or products that 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.  The  FDA  is  not  bound  by  the  recommendations  of  an  advisory  committee,  but  it 
considers such recommendations carefully when making decisions.

Before  approving  an  NDA,  the  FDA  typically  will  inspect  the  facility  or  facilities  where  the  product  is  manufactured.  The  FDA  will  not  approve  an 
application  unless  it  determines  that  the  manufacturing  processes  and  facilities  are  in  compliance  with  cGMP  requirements  and  adequate  to  assure 
consistent  production  of  the  product  within  required  specifications.  In  addition,  before  approving  an  NDA,  the  FDA  will  typically  inspect  one  or  more 
clinical  sites  to  assure  compliance  with  GCP  and  integrity  of  the  clinical  data  submitted.    With  passage  of  the  FDORA,  Congress  clarified  the  FDA’s 
authority to conduct inspections by expressly permitting inspection of facilities involved in the preparation, conduct, or analysis of clinical and non-clinical 
studies submitted to FDA as well as other persons holding study records or involved in the study process.

After the FDA’s evaluation of the NDA and inspection of the manufacturing facilities, the FDA 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 NDA will not be approved in its present form and generally outlines the deficiencies in the submission, which may require substantial 
additional  testing  or  information  in  order  for  the  FDA  to  reconsider  the  application.  If  and  when  those  deficiencies  have  been  addressed  to  the  FDA’s 
satisfaction in a resubmission of the NDA, the FDA will issue an approval letter. The FDA has committed to reviewing such resubmissions in two or six 
months  depending  on  the  type  of  information  included.  Even  with  submission  of  this  additional  information,  the  FDA  ultimately  may  decide  that  the 
application  does  not  satisfy  the  regulatory  criteria  for  approval  and  refuse  to  approve  the  NDA.  Even  if  the  FDA  approves  a  product,  it  may  limit  the 
approved indications for use for the product, require that contraindications, warnings or precautions be included in the product labeling, require that post-
approval studies, including Phase 4 clinical studies, be conducted to further assess a drug’s safety after approval, require testing and surveillance programs 
to  monitor  the  product  after  commercialization,  or  impose  other  conditions,  including  distribution  and  use  restrictions  or  other  risk  management 
mechanisms, including Risk Evaluation and Mitigation Strategies (REMS), which can materially affect the potential market and profitability of the product 
or impose new labeling, testing or distribution and use requirements. The FDA may prevent or limit further marketing of a product based on the results of 
post-market  studies  or  surveillance  programs.  After  approval,  some  types  of  changes  to  the  approved  product,  such  as  adding  new  indications, 
manufacturing changes and additional labeling claims, are subject to further testing requirements and FDA review and approval. 

Fast Track designation

The  FDA  is  required  to  facilitate  and  expedite  the  development  and  review  of  drugs  that  are  intended  for  the  treatment  of  a  serious  or  life-threatening 
disease  or  condition  for  which  there  is  no  effective  treatment  and  which  demonstrate  the  potential  to  address  unmet  medical  needs  for  the  disease  or 
condition. Under the Fast Track program, the sponsor of a new product candidate may request the FDA to designate the product for a specific indication as 
a Fast Track 

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product concurrent with or after the filing of the IND for the product candidate. The FDA must determine if the product candidate qualifies for fast track 
designation within 60 calendar days after receipt of the sponsor’s request.

In addition to other benefits, such as the ability to have greater interactions with the FDA, the FDA may initiate review of sections of a Fast Track product’s 
NDA before the application is complete. This rolling review is available if the applicant provides and the FDA approves a schedule for the submission of 
the remaining information and the applicant pays applicable user fees. However, the FDA’s time period goal for reviewing a Fast Track application does not 
begin until the last section of the NDA is submitted. In addition, the Fast Track designation may be withdrawn by the FDA if the FDA believes that the 
designation is no longer supported by data emerging in the clinical study process.

Priority review

Under FDA policies, a product candidate may be eligible for priority review, a review generally within a six-month time frame from the time a complete 
application is received or filed. Products generally are eligible for priority review if they are intended for treatment of a serious or life-threatening disease 
or condition and provide a significant improvement in safety or effectiveness compared to marketed products in the treatment, diagnosis or prevention of a 
serious disease or condition. 

Accelerated approval

Under  the  FDA’s  accelerated  approval  regulations,  the  FDA  may  approve  a  drug  for  a  serious  or  life-threatening  illness  that  provides  meaningful 
therapeutic benefit to patients over existing treatments based upon a surrogate endpoint that is reasonably likely to predict clinical benefit or on a clinical 
endpoint  that  can  be  measured  earlier  than  irreversible  morbidity  or  mortality  (IMM).  In  clinical  studies,  a  surrogate  endpoint  is  a  measurement  of 
laboratory  or  clinical  signs  of  a  disease  or  condition  that  substitutes  for  a  direct  measurement  of  how  a  patient  feels,  functions  or  survives.  Surrogate 
endpoints can often be measured more easily or more rapidly than clinical endpoints. A product candidate approved on this basis is subject to rigorous post-
marketing compliance requirements, including the completion of Phase 4 or post-approval clinical studies to confirm the effect on the clinical endpoint. 
Failure to conduct required post-approval studies, or confirm a clinical benefit during post-marketing studies, would allow the FDA to withdraw the drug 
from the market on an expedited basis. All promotional materials for drug candidates approved under accelerated regulations are subject to prior review by 
the FDA. With the passage of the FDORA, the FDA is authorized to require a post-approval study to be underway prior to approval or within a specified 
time period following approval. FDORA also requires the FDA to specify conditions of any required post-approval study and requires sponsors to submit 
progress reports for required post-approval studies and any conditions required by the FDA until completion or termination of the study. FDORA further 
enables the FDA to initiate criminal prosecutions for the failure to conduct with due diligence a required post-approval study, including a failure to meet 
any required conditions specified by the FDA or to submit timely reports.

Breakthrough therapy designation

A sponsor can request designation of a product candidate as a “breakthrough therapy.” A breakthrough therapy is defined as a drug that is intended, alone or 
in combination with one or more other drugs, to treat a serious or life-threatening disease or condition, and preliminary clinical evidence indicates that the 
drug may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects 
observed early in clinical development. Drugs designated as breakthrough therapies also may be eligible for priority review. The FDA must take certain 
actions,  such  as  holding  timely  meetings  and  providing  advice,  intended  to  expedite  the  development  and  review  of  an  application  for  approval  of  a 
breakthrough  therapy.  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. 

Orphan drugs 

Under  the  Orphan  Drug  Act,  as  amended,  the  FDA  may  grant  orphan  drug  designation  to  drugs  intended  to  treat  a  rare  disease  or  condition,  which  is 
generally defined as a disease or condition that affects fewer than 200,000 individuals in the United States or that affects more than 200,000 individuals in 
the United States and for which there is no reasonable expectation that the cost of developing and making available the drug for the disease or condition 
will be recovered from sales of the product in the United States. Orphan drug designation must be requested before submitting 

11

 
an NDA or BLA. After the FDA grants orphan drug designation, the identity of the product and its potential orphan use are disclosed publicly by the FDA. 
Orphan drug designation does not shorten the duration of the regulatory review and approval process. If a product that has orphan designation subsequently 
receives the first FDA approval for a particular active ingredient for the disease or condition for which it has such designation, the product is entitled to 
Orphan  Drug  exclusivity,  which  means  that  the  FDA  may  not  approve  other  applications  to  market  the  same  product  for  the  same  indication  for  seven 
years, except in limited circumstances, such as a showing of clinical superiority to the product with orphan drug exclusivity. A drug will be considered 
clinically superior if it is shown to be safer, more effective or makes a major contribution to patient care. Orphan drug exclusivity does not prevent the FDA 
from approving a different drug for the same orphan disease or condition, or the same drug for a different disease or condition. Among the other benefits of 
orphan drug designation are tax credits for certain research and a waiver of the NDA/BLA application user fee.

Pediatric information

Under the Pediatric Research Equity Act of 2003, as amended, an NDA or supplement to an NDA for drug with certain novel features (e.g., new active 
ingredient, new indication) must contain data that are adequate to assess the safety and effectiveness of the drug for the claimed indications in all relevant 
pediatric subpopulations, and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. The FDA 
may, on its own initiative or at the request of the applicant, grant deferrals for submission of some or all pediatric data until after approval of the product for 
use in adults, or full or partial waivers from the pediatric data requirements. A sponsor of a new drug subject to the above pediatric testing requirements 
also is required to submit to the FDA a pediatric study plan generally 60 days after an end-of-Phase 2 meeting with the agency. Generally, the pediatric data 
requirements do not apply to products with orphan drug designation.

Other regulatory requirements

Any  drug  manufactured  or  distributed  by  us  pursuant  to  FDA  approvals  will  be  subject  to  pervasive  and  continuing  regulation  by  the  FDA,  including, 
among other things, requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising and promotion and reporting 
of adverse experiences with the product. After approval, most changes to the approved product, such as adding new indications or other labeling claims, are 
subject to prior FDA review and approval.

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

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

Once  an  approval  is  granted,  the  FDA  may  withdraw  the  approval  if  compliance  with  regulatory  requirements  and  standards  is  not  maintained  or  if 
problems  occur  after  the  product  reaches  the  market.  Later  discovery  of  previously  unknown  problems  with  a  product,  including  adverse  events  of 
unanticipated  severity  or  frequency,  or  with  manufacturing  processes,  or  failure  to  comply  with  regulatory  requirements,  may  result  in  revisions  to  the 
approved  labeling  to  add  new  safety  information,  imposition  of  post-market  studies  or  clinical  studies  to  assess  new  safety  risks  or  imposition  of 
distribution or other restrictions under a REM program. Other potential consequences include, among other things:

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

fines, warning letters or holds on post-approval clinical studies;

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

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

consent decrees, injunctions or the imposition of civil or criminal penalties.

The FDA strictly regulates marketing, labeling, advertising and promotion of products that are placed on the market. Drugs generally may be promoted 
only for the approved indications and in accordance with the provisions of the approved labeling. The FDA and other agencies actively enforce the laws 
and regulations prohibiting the promotion of off label uses, and a company that is found to have improperly promoted off label uses may be subject to 
significant liability.

Physician Drug Samples

As part of the sales and marketing process, pharmaceutical companies frequently provide samples of approved drugs to physicians. The Prescription Drug 
Marketing Act (PDMA) regulates the distribution of drug samples at the federal level and sets minimum standards for the registration and regulation of 
drug  distributors  by  the  states.  Both  the  PDMA  and  state  laws  limit  the  distribution  of  prescription  pharmaceutical  product  samples  and  impose 
requirements to ensure accountability in distribution. In addition, the PDMA sets forth civil and criminal penalties for violations.

Foreign Regulation

In  order  to  market  any  product  outside  of  the  United  States,  we  would  need  to  comply  with  numerous  and  varying  regulatory  requirements  of  other 
countries regarding safety and efficacy and governing, among other things, clinical studies, marketing authorization, commercial sales and distribution of 
our  products.  Whether  or  not  we  obtain  FDA  approval  for  a  product,  we  would  need  to  obtain  the  necessary  approvals  by  the  comparable  regulatory 
authorities of foreign countries before we can commence clinical studies or marketing of the product in those countries. The approval process varies from 
country to country and can involve additional product testing and additional administrative review periods. The time required to obtain approval in other 
countries  might  differ  from  and  be  longer  than  that  required  to  obtain  FDA  approval.  Regulatory  approval  in  one  country  does  not  ensure  regulatory 
approval in another, but a failure or delay in obtaining regulatory approval in one country may negatively impact the regulatory process in others.

Pharmaceutical Coverage, Pricing and Reimbursement

Significant uncertainty exists as to the coverage and reimbursement status of any drug products for which we may obtain regulatory approval. Sales of any 
of our product candidates, if approved, will depend, in part, on the extent to which the costs of the products will be covered by third-party payors, including 
government health programs such as Medicare and Medicaid, commercial health insurers and managed care organizations. The process for determining 
whether a payor will provide coverage for a drug product may be separate from the process for setting the price or reimbursement rate that the payor will 
pay for the drug product once coverage is approved. Third-party payors may limit coverage to specific drug products on an approved list, or formulary, 
which might not include all of the approved drugs for a particular indication.

The containment of healthcare costs has become a priority of federal, state and foreign governments, and the prices of drugs have been a focus in this effort. 
Third-party  payors  are  increasingly  challenging  the  prices  charged  for  medical  products  and  services  and  examining  the  medical  necessity  and  cost-
effectiveness of medical products and services, in addition to their safety and efficacy. Accordingly, we may need to conduct expensive pharmacoeconomic 
studies in order to demonstrate the medical necessity and cost-effectiveness of our product candidates, in addition to the trials required to obtain FDA or 
other comparable regulatory approvals. If these third-party payors do not consider our products to be cost-effective compared to other available therapies, 
they  may  not  cover  our  products  after  approval  as  a  benefit  under  their  plans  or,  if  they  do,  the  level  of  payment  may  not  be  sufficient  to  enable  us  to 
maintain price levels high enough to realize an appropriate return on our investment in product development. Further, one payor’s determination to provide 
coverage  for  a  product,  if  approved,  does  not  assure  that  other  payors  will  also  provide  coverage  and  reimbursement  for  the  product,  and  the  level  of 
coverage and reimbursement can differ significantly from payor to payor.

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Pricing  and  reimbursement  schemes  vary  widely  from  country  to  country.  Some  countries  provide  that  drug  products  may  be  marketed  only  after  a 
reimbursement price has been agreed. Some countries may require the completion of additional studies that compare the cost-effectiveness of a particular 
product candidate to currently available therapies. For example, the European Union provides options for its member states to restrict the range of drug 
products for which their national health insurance systems provide reimbursement and to control the prices of medicinal products for human use. European 
Union member states may approve a specific price for a drug product or may instead adopt a system of direct or indirect controls on the profitability of us 
placing the drug product on the market. Other member states allow companies to fix their own prices for drug products but monitor and control company 
profits.  The  downward  pressure  on  health  care  costs  in  general,  particularly  prescription  drugs,  has  become  very  intense.  As  a  result,  increasingly  high 
barriers  are  being  erected  to  the  entry  of  new  products.  In  addition,  in  some  countries,  cross-border  imports  from  low-priced  markets  exert  competitive 
pressure that may reduce pricing within a country. There can be no assurance that any country that has price controls or reimbursement limitations for drug 
products will allow favorable reimbursement and pricing arrangements for any of our products.

The marketability of any products for which we may receive regulatory approval for commercial sale is dependent on the availability of adequate coverage 
and reimbursement from government and third-party payors. In addition, the emphasis on managed care in the United States has increased and we expect 
will continue to increase the pressure on drug pricing. Coverage policies, third-party reimbursement rates and drug pricing regulation may change at any 
time. For example the Affordable Care Act of 2010, as amended by, the Health Care and Education Reconciliation Act (collectively, ACA), among other 
things,  imposed  an  annual  fee  on  any  entity  that  manufactures  or  imports  certain  branded  prescription  drugs,  increased  the  minimum  Medicaid  rebates 
owed by most manufacturers under the Medicaid Drug Rebate Program, and established the Medicare Part D coverage gap discount program.  In addition 
to these provisions, the ACA established a number of bodies whose work may have a future impact on the market for certain pharmaceutical products, 
including the Patient-Centered Outcomes Research Institute, established to oversee, identify priorities in, and conduct comparative clinical effectiveness 
research,  and  the  Center  for  Medicare  and  Medicaid  Innovation  within  the  Centers  for  Medicare  and  Medicaid  Services,  established  to  test  innovative 
payment and service delivery models to lower Medicare and Medicaid spending. 

Since its enactment, there have been executive, judicial, and Congressional challenges to certain aspects of the ACA. For example, former President Trump 
issued directives designed to delay the implementation of certain PPACA provisions or otherwise circumvent requirements for health insurance mandated 
by the PPACA, and Congress has considered legislation that would repeal, or repeal and replace all or part of the ACA. While Congress has not passed 
comprehensive repeal legislation, several bills affecting the implementation of certain taxes under the ACA have been signed into law. For example, the 
Tax Cuts and Jobs Act, effectively repealed the individual health insurance mandate, which is considered a key component of the ACA. On June 17, 2021, 
the  U.S.  Supreme  Court  dismissed  a  challenge  on  procedural  grounds  that  argued  the  PPACA  is  unconstitutional  in  its  entirety  because  the  “individual 
mandate”  was  repealed  by  Congress.  Another  case  challenging  the  PPACA’s  requirement  that  insurers  cover  certain  preventative  services  is  currently 
pending before the Fifth Circuit Court of Appeals. 

In  addition,  other  legislative  changes  have  been  proposed  and  adopted  since  the  ACA  was  enacted.  These  changes  included  aggregate  reductions  to 
Medicare payments to providers of up to 2% per fiscal year, and, due to subsequent legislative amendments, will remain in effect through 2031, with the 
exception of a temporary suspension from May 1, 2020 through March 2021, due to the COVID-19 pandemic. Further, in January 2013, then President 
Obama  signed  into  law  the  American  Taxpayer  Relief  Act  of  2012,  which,  among  other  things,  reduced  Medicare  payments  to  several  providers,  and 
increased  the  statute  of  limitations  period  for  the  government  to  recover  overpayments  to  providers  from  three  to  five  years.  These  laws  may  result  in 
additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtain for any of our product candidates for which 
we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used.

Additionally, there has been increasing legislative and enforcement interest in the United States with respect to drug pricing practices. Specifically, there 
have been several recent United States Congressional inquiries and proposed and enacted federal legislation designed to, among other things, bring more 
transparency  to  drug  pricing,  reduce  the  cost  of  prescription  drugs  under  Medicare,  review  the  relationship  between  pricing  and  manufacturer  patient 
programs, and reform government program reimbursement methodologies for drugs. For example, the Inflation Reduction Act of 2022, or IRA, enacted on 
August  16,  2022,  seeks  to  reduce  prescription  drug  costs  by,  among  other  provisions,  allowing  Medicare  to  negotiate  prices  for  certain  high-cost 
prescription drugs in Medicare Parts B and D, imposing 

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an  excise  tax  on  pharmaceutical  manufacturers  that  refuse  to  negotiate  pricing  with  Medicare,  and  requiring  inflation  rebates  to  limit  annual  drug  price 
increases in Medicare. These provisions began taking effect progressively starting in 2023, including an initial group of ten drugs that HHS selected for the 
first  cycle  of  Medicare  drug  price  negotiations  in  2024.  Beginning  in  2025,  the  IRA  also  eliminates  the  coverage  gap  under  Medicare  Part  D  by 
significantly  lowering  the  enrollee  maximum  out-of-pocket  cost  and  imposing  on  new  manufacturer  discount  program.  The  Centers  for  Medicare  & 
Medicaid Services (CMS) has begun to implement aspects of the Inflation Reduction Act and has released guidance addressing the Medicare Part B and 
Medicare  Part  D  inflation  rebate  provisions  of  the  Inflation  Reduction  Act;  however,  various  industry  stakeholders,  including  certain  pharmaceutical 
companies  and  industry  trade  organizations  have  initiated  lawsuits  against  the  federal  government  asserting  that  the  price  negotiation  provisions  of  the 
Inflation Reduction Act are unconstitutional. The impact of these judicial challenges and future government reform measures on us and the pharmaceutical 
industry as a whole is unclear. Further, on December 7, 2023, the Biden administration announced an initiative to control the price of prescription drugs 
through  the  use  of  march-in  rights  under  the  Bayh-Dole  Act.  On  December  8,  2023,  the  National  Institute  of  Standards  and  Technology  published  for 
comment a Draft Interagency Guidance Framework for Considering the Exercise of March-In Rights which for the first time includes the price of a product 
as one factor an agency can use when deciding to exercise march-in rights.

In addition, in September 2020, the FDA issued a final rule that sets up a legal framework for allowing the importation of certain prescription drugs from 
Canada,  and  the  CMS  issued  guidance  that  addresses  the  treatment  of  certain  imported  drugs  under  the  Medicaid  Drug  Rebate  Program.  On  January  5, 
2024,  the  FDA  authorized  the  state  of  Florida’s  Section  804  Importation  Program,  which  is  the  first  major  step  in  allowing  the  state  to  import  certain 
prescription drugs from Canada. If the program is ultimately approved, it will be the first such program authorized in the United States.

Although  a  number  of  these  and  other  proposed  measures  may  require  authorization  through  additional  legislation  to  become  effective,  and  the  Biden 
administration may reverse or otherwise change these measures, both the Biden administration and Congress have indicated that they will continue to seek 
new legislative measures to control drug costs.

At  the  state  level,  individual  states  are  increasingly  aggressive  in  passing  legislation  and  implementing  regulations  designed  to  control  pharmaceutical 
product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and 
transparency measures. These measures could reduce the ultimate demand for our products, if approved, or put pressure on our product pricing. We expect 
that  additional  state  and  federal  healthcare  reform  measures  will  be  adopted  in  the  future,  any  of  which  could  limit  the  amounts  that  federal  and  state 
governments will pay for healthcare products and services, which could result in reduced demand for our product candidates or additional pricing pressures.

Other Healthcare Laws

In the United States, our activities are potentially subject to regulation by various federal, state and local authorities in addition to the FDA, including but 
not limited to, CMS, other divisions of the U.S. Department of Health and Human Services (e.g., the Office of Inspector General), the U.S. Department of 
Justice  (DOJ),  and  individual  U.S.  Attorney  offices  within  the  DOJ,  and  state  and  local  governments.  For  example,  the  Company’s  business  practices, 
including its research and sales, marketing and scientific/ educational grant programs may be required to comply with federal and state fraud and abuse 
laws, false claims laws, the data privacy and security provisions of the Health Insurance Portability and Accountability Act (HIPAA), federal transparency
requirements and similar state laws, each as amended. The laws that may affect our ability to operate include, but are not limited to:

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the  federal  Anti-Kickback  Statute,  which  prohibits,  among  other  things,  knowingly  and  willfully  soliciting,  receiving,  offering  or  paying  any 
remuneration (including any kickback, bribe, or rebate), directly or indirectly, overtly or covertly, in cash or in kind, to induce, or in return for, 
either the referral of an individual, or the purchase, lease, order or recommendation of any good, facility, item or service for which payment may 
be made, in whole or in part, under a federal healthcare program, such as the Medicare and Medicaid programs. A person or entity can be found 
guilty  of  violating  the  statute  without  actual  knowledge  of  the  statute  or  specific  intent  to  violate  it.  The  Anti-Kickback  Statute  has  been 
interpreted to apply to arrangements between pharmaceutical manufacturers on the one hand and patients, prescribers, purchasers, and formulary 
managers on the other;

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federal civil and criminal false claims laws, including the federal False Claims Act, which can be enforced by private citizens through civil qui 
tam actions, and civil monetary penalty laws that prohibit individuals or entities for, among other things: knowingly presenting, or causing to be 
presented, to the federal government, claims for payment that are false or fraudulent; making a false statement or record material to a false or 
fraudulent  claim  or  obligation  to  pay  or  transmit  money  or  property  to  the  federal  government;  or  knowingly  concealing  or  knowingly  and 
improperly avoiding or decreasing an obligation to pay money to the federal government. In addition, the government may assert that a claim 
including items and services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of 
the False Claims Act. Manufacturers can be held liable under the False Claims Act even when they do not submit claims directly to government 
payors if they are deemed to “cause” the submission of false or fraudulent claims;

HIPAA, among other things, imposes criminal liability for knowingly and willfully executing, or attempting to execute, a scheme to defraud any 
healthcare  benefit  program  or  obtain,  by  means  of  false  or  fraudulent  pretenses,  representations,  or  promises,  any  of  the  money  or  property 
owned by, or under the custody or control of, any healthcare benefit program, regardless of the payor (e.g., public or private) and knowingly and 
willfully falsifying, concealing or covering up by any trick or device a material fact or making any materially false statements in connection with 
the delivery of, or payment for, healthcare benefits, items or services relating to healthcare matters. Similar to the federal Anti-Kickback Statute, 
a person or entity can be found guilty of violating HIPAA without actual knowledge of the statute or specific intent to violate it;

HIPAA,  as  amended  by  HITECH,  and  their  respective  implementing  regulations,  which  impose  requirements  on  certain  covered  healthcare 
providers, health plans, and healthcare clearinghouses as well as their respective business associates that perform services for them that involve 
the use, or disclosure of, individually identifiable health information, relating to the privacy, security and transmission of individually identifiable 
health information. HITECH also created new tiers of civil monetary penalties, amended HIPAA to make civil and criminal penalties directly 
applicable to business associates, and gave state attorneys general new authority to file civil actions for damages or injunctions in federal courts 
to enforce the federal HIPAA laws and seek attorneys’ fees and costs associated with pursuing federal civil actions;

the federal false statements statute prohibits making a false statement to an agent or agency of the federal government in connection with certain 
federal matters;

the federal transparency requirements under the ACA, including the provision commonly referred to as the Physician Payments Sunshine Act, 
which requires manufacturers of drugs, devices, biologics and medical supplies for which payment is available under Medicare, Medicaid or the 
Children’s Health Insurance Program to report annually to the U.S. Department of Health and Human Services information related to payments 
or other transfers of value made to physicians, certain other healthcare professionals (such as nurse practitioners and physicians' assistants, and 
teaching hospitals, as well as ownership and investment interests held by physicians and their immediate family members;

federal  government  price  reporting  laws,  which  require  companies  to  calculate  and  report  complex  pricing  metrics  in  an  accurate  and  timely 
manner to government programs; and

federal  consumer  protection  and  unfair  competition  laws,  which  broadly  regulate  marketplace  activities  and  activities  that  potentially  harm 
consumers.

Additionally, we are subject to state and non-U.S. equivalents of each of the healthcare laws described above, among others, some of which may be broader 
in scope and may apply regardless of the payor. Many U.S. states have adopted laws similar to the federal Anti-Kickback Statute, some of which apply to 
the referral of patients for healthcare services reimbursed by any source, not just governmental payors, including private insurers. In addition, some states 
require pharmaceutical companies to implement compliance programs, comply with the pharmaceutical industry’s voluntary compliance guidelines and the 
relevant  compliance  guidance  promulgated  by  the  federal  government,  or  to  track  and  report  gifts,  compensation  and  other  remuneration  provided  to 
physicians  and  other  healthcare  providers.  There  also  are  state  laws  that  require  the  reporting  of  marketing  expenditures  or  drug  pricing,  including 
information pertaining to and justifying price increases, state and local laws that require the registration of pharmaceutical sales representatives or other 
state or local licensure, state laws that prohibit various marketing-related activities, such as 

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the provision of certain kinds of gifts or meals, and state laws that require the posting of information relating to clinical trials and their outcomes. There are 
ambiguities as to what is required to comply with these state requirements and if we fail to comply with an applicable state law requirement, we could be 
subject to penalties.

In addition, regulators globally are also imposing greater monetary fines for privacy violations. In respect of our engagement of European contract research 
organizations  (CROs)  in  the  context  of  clinical  trials,  the  General  Data  Protection  Regulation  (EU  GDPR),  which  went  into  effect  on  May  25,  2018, 
applies. The EU GDPR applies to any company established in the EU as well as to those outside the EU if they collect and use personal data in connection 
with the offering goods or services to individuals in the EU or the monitoring of their behavior. The EU GDPR enhances data protection obligations for 
processors  and  controllers  of  personal  data,  including,  for  example,  expanded  disclosures  about  how  personal  information  is  to  be  used,  limitations  on 
retention of information, mandatory data breach notification requirements and onerous new obligations on services providers. Noncompliance with the EU 
GDPR may result in monetary penalties of up to €20 million or 4% of worldwide revenue, whichever is higher. In addition, violations of the EU GDPR 
could  result  in  regulatory  investigations,  reputational  damage,  orders  to  cease  and/or  change  our  processing  activities,  enforcement  notices  and/or 
assessment  notices  (for  compulsory  audit).  We  may  also  face  civil  claims,  including  representative  actions  and  other  class  action  type  litigation  (where 
individuals have suffered harm), potentially amounting to significant compensation or damages liabilities as well as associated costs, diversion of internal 
resources and reputational harm. This is as the EU GDPR confers a private right of action on data subjects and consumer associations to lodge complaints 
with supervisory authorities, seek judicial remedies, and obtain compensation for damages resulting from violations. 

The EU GDPR may increase our responsibility and liability in relation to personal data that we process where such processing is subject to the EU GDPR, 
and we may be required to put in place additional mechanisms to ensure compliance with the EU GDPR, including as implemented by individual countries. 
In  July  2020,  the  EU-US  Privacy  Shield  was  invalidated  as  a  valid  personal  data  transfer  mechanism  and  on  June  27,  2021,  the  European  Commission
published a new set of modular standard contractual clauses (New SCCs). The New SCCs must be used for all relevant transfers of personal data outside 
the European Economic Area (EEA) (since December 27, 2022). On July 11, 2023, the European Commission entered into force its adequacy decision for 
the EU-US Data Privacy Framework (a new framework for transferring personal information from the EEA to the United States), having determined that 
such framework ensures that the protection of personal information transferred from the EEA to the US will be comparable to the protection offered in the 
EU. However, this decision will likely face legal challenges and ultimately may be invalidated by the Court of Justice of the European Union (CJEU) just 
as  the  EU-US  Privacy  Shield  was.  The  cross-border  data  transfer  landscape  in  the  EEA  is  continually  developing,  and  we  are  monitoring  these 
developments. We may, in addition to other impacts, experience additional costs associated with increased compliance burdens and be required to engage in 
new contract negotiations with third parties that aid in processing data on our behalf or localize certain data. 

California enacted the California Consumer Privacy Act (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 personal data of consumers or households. The CCPA will require covered 
companies to provide certain disclosures to consumers about its data collection, use and sharing practices, and to provide affected California residents with 
ways to opt-out of certain sales or transfers of personal information. While there is currently an exception for protected health information that is subject to 
HIPAA and clinical trial regulations, as currently written, the CCPA may impact our business activities. Additionally, the California Privacy Rights Act 
(CPRA), which went into effect on January 1, 2023, imposes additional obligations on companies covered by the legislation and expands consumers’ rights 
with respect to certain sensitive personal information, among other things. The CPRA also creates a new state agency that will be vested with authority to 
implement and enforce the CCPA and the CPRA. Other states, including Virginia and Colorado have similarly passed data privacy laws that will regulate 
how businesses collect and share personal information.

New Legislation and Regulations

From time to time, legislation is drafted, introduced and passed in Congress that could significantly change the statutory provisions governing the testing, 
approval,  manufacturing,  marketing,  and  reimbursement  status  of  products  regulated  by  the  FDA.  In  addition  to  new  legislation,  FDA  regulations  and 
policies  are  often  revised  or  interpreted  by  the  agency  in  ways  that  may  significantly  affect  our  business  and  our  products.  It  is  impossible  to  predict 
whether 

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further  legislative  changes  will  be  enacted  or  whether  FDA  regulations,  guidance,  policies  or  interpretations  will  be  changed  or  what  the  effect  of  such 
changes, if any, may be.

Competition

The  pharmaceutical  and  biotechnology  industry  is  very  competitive,  and  the  development  and  commercialization  of  new  drugs  is  influenced  by  rapid 
technological  developments  and  innovation.  We  face  competition  from  several  companies  developing  and  commercializing  products  that  will  be 
competitive  with  our  drug  candidates,  including  large  pharmaceutical  and  smaller  biotechnology  companies.  Additionally,  new  entrants  may  potentially 
enter  the  market.  Potential  competitors  include  Johnson  &  Johnson,  Roche,  GlaxoSmithKline  plc,  Enanta  Pharmaceuticals,  Inc.,  HEC  Pharma,  Arbutus 
Biopharma, Vir Bio, Aligos Therapeutics, AiCuris Anti-infective Cures AG and Qilu Pharmaceutical, among others. Additionally, we may face competition 
from currently available HBV treatments. Some of the competitive development programs from these companies may be based on scientific approaches 
that  are  similar  to  our  approach,  and  others  may  be  based  on  entirely  different  approaches.  Potential  competitors  also  include  academic  institutions, 
government  agencies  and  other  public  and  private  research  organizations  that  conduct  research,  seek  patent  protection  and  establish  collaborative 
arrangements for research, development, manufacturing and commercialization of products similar to ours or that otherwise target indications that we are 
pursuing.

Manufacturing

We currently rely on third-party manufacturers to supply the quantities of our investigational product candidates used in our clinical and nonclinical studies. 
We currently have no plans to establish any manufacturing facilities for our product candidates. 

Human Capital Management

As of December 31, 2023, we had 65 total employees and contracts with a number of temporary contractors, consultants and CROs. The majority of our 
employees work out of our facility in South San Francisco, California. We also have a small number of remote employees spread across the United States 
and one remote employee in the UK.

We continually evaluate our needs and make strategic choices regarding whether to hire internal teams or outsource certain functions to CROs or contract 
manufacturing organizations (CMOs), as appropriate. We currently outsource our clinical study management to various CROs and utilize certain CMOs to 
manufacture both the drug substance and the drug product used in our ongoing and planned clinical studies.

We compete with both large and small companies in our industry for a limited number of qualified applicants to fill highly specialized needs. We generally 
target our base salaries and annual performance-based cash bonuses at the 50th percentile of our peers and our long-term equity incentive compensation, 
which all employees receive, between the 50th and 75th percentiles of our peers. In certain circumstances, we offer compensation above these levels, based 
on a candidate’s experience, criticality, amount of responsibility and either individual or Company-wide performance. We routinely review our employees’ 
base  salaries  to  ensure  they  remain  market  competitive.  Both  annual  performance-based  cash  bonuses  and  long-term  equity  compensation  increase  as  a 
percentage  of  total  compensation  based  on  employees’  levels  of  responsibility.  We  also  offer  comprehensive  benefits  packages  to  all  of  our  employees, 
including:  100%  Company-covered  medical,  dental  and  vision  coverage  for  employees  and  their  families;  a  401k  program  with  a  Company  match;  a 
comprehensive employee assistance program, an employee stock purchase plan; and paid family leave.

A  large  majority  of  our  employees  have  advanced  degrees,  and  we  also  offer  an  educational  assistance  program  that  reimburses  employees  up  to  a 
maximum amount per year for courses that directly enhance his or her area of professional work or contribute to his or her immediate career growth. This 
program demonstrates our commitment to analytical growth, enhanced knowledge and professional development.

Reverse Stock Split

On September 27, 2023, we received a letter from the Listing Qualifications Department of the Nasdaq Stock Market notifying us that, because the bid 
price for our common stock had closed below $1.00 per share for the prior 30 consecutive business days, we were not in compliance with Nasdaq Listing 
Rule 5450(a)(1), which is the minimum bid price requirement for continued listing on the Nasdaq Global Select Market. In accordance with Nasdaq Listing 
Rule 5810(c)(3)(A), we were provided a 180-calendar day period, or until March 25, 2024, to regain 

18

 
 
 
compliance with the minimum bid price requirement. To regain compliance with the Nasdaq Listing Rules, on January 31, 2024, our stockholders approved 
a reverse stock split of our common stock at a range of ratios between 1-for-7 to 1-for-17, and our board of directors approved the implementation of a 
reverse stock split at a ratio of 1-for-12 shares of our common stock (the Reverse Stock Split). The Reverse Stock Split was effective as of February 9, 
2024, our common stock began trading on the Nasdaq Global Select Market on an as-split basis on February 12, 2024, and the Company regained 
compliance with the minimum bid price requirement of the Nasdaq Listing Rules on February 27, 2024, by having the closing bid price of our common 
stock exceed $1.00 for a minimum of ten consecutive trading days during the compliance period.  

All share and per share amounts of our common stock presented in this Annual Report on Form 10-K have been retroactively adjusted to reflect the 1-for-
12 Reverse Stock Split. 

Corporate History

We  were  incorporated  in  Delaware  in  October  2005  under  the  name  South  Island  Biosciences,  Inc.  (which  was  changed  to  Ventrus  Biosciences,  Inc.  in 
April 2007). On July 11, 2014, we acquired Assembly Pharmaceuticals, Inc., a private company, through a merger with our wholly owned subsidiary (the 
Merger). In connection with the Merger, we changed our name from Ventrus Biosciences, Inc. to Assembly Biosciences, Inc.

Corporate Information

Our principal executive office is at Two Tower Place, 7th Floor, South San Francisco, California 94080. Our telephone number is (833) 509-4583.

Available Information

Our website address is www.assemblybio.com. We routinely post, or have posted, important information for investors on our website in the “Investors” 
section.  We  use  this  website  as  a  means  of  disclosing  material  information  in  compliance  with  our  disclosure  obligations  under  Regulation  FD. 
Accordingly,  investors  should  monitor  the  “Investors”  section  of  our  website,  in  addition  to  following  our  press  releases,  Securities  and  Exchange 
Commission (SEC) filings, presentations and webcasts. We make available free of charge through our website our press releases, Annual Reports on Form 
10-K,  Quarterly  Reports  on  Form  10-Q,  Current  Reports  on  Form  8-K  and  all  amendments  to  those  reports  as  soon  as  reasonably  practicable  after 
electronically filed with or furnished to the SEC.

The information contained on our website is not a part of, and should not be construed as being incorporated by reference, into this report.

The  reports  filed  with  the  SEC  by  us  and  by  our  officers,  directors  and  significant  stockholders  are  available  for  review  on  the  SEC’s  website  at 
www.sec.gov.

19

 
 
Item 1A. Risk Factors

You should carefully consider the following risk factors, together with all other information in this report, including our consolidated financial statements 
and notes thereto, and in our other filings with the SEC. If any of the following risks, or other risks not presently known to us or that we currently believe to 
not be material, develop into actual events, then our business, financial condition, results of operations or prospects could be materially adversely affected. 
If that happens, the market price of our common stock could decline, and stockholders may lose all or part of their investment.

Risks Related to Our Business

We have no approved products and depend on the future success of the product candidates in our research and development pipeline. We cannot be 
certain that we or our collaborators will be able to obtain regulatory approval for, or successfully commercialize, product candidates from our current 
pipeline or any other product candidates that we may subsequently identify, license or otherwise acquire.

We and our collaborators are not permitted to market or promote any products in the United States, Europe, China or other countries before we receive 
regulatory approval from the FDA or comparable foreign regulatory authorities, and we may never receive such regulatory approval for our current product 
candidates. We have not submitted a new drug application (NDA) to the FDA or comparable applications to other regulatory authorities and do not expect 
to be in a position to do so in the near future.

All  of  our  product  candidates  are  in  clinical  development  or  in  varying  stages  of  nonclinical  development.  Data  supporting  our  drug  discovery  and 
nonclinical and clinical development programs are derived from laboratory studies, nonclinical studies and Phase 1 clinical studies. It may be years before 
the larger, pivotal studies necessary to support regulatory approval of our current product candidates are completed, if ever. 

In  addition  to  our  current  product  pipeline,  we  may  identify,  license  or  otherwise  acquire  rights  to  other  technologies  or  product  candidates.  Any  such 
transactions  would  involve  numerous  risks,  and  we  may  be  unsuccessful  in  entering  into  any  such  transactions  or  developing  any  such  technologies  or 
product candidates.

For  these  reasons,  our  drug  discovery  and  development  may  not  be  successful,  and  we  may  be  unable  to  continue  clinical  development  of  our  product 
candidates  and  may  not  generate  product  approvals  or  product  revenue,  any  of  which  could  have  a  material  adverse  impact  on  our  business,  results  of 
operations and financial condition.

We are not currently profitable and might never become profitable, and we will need additional financing to complete the development of any product 
candidates and fund our activities into the future. 

We do not have any approved products, and we have a history of losses. We expect to continue to incur substantial operating and capital expenditures to 
advance  our  current  product  candidates  through  clinical  development,  continue  research  and  discovery  efforts  to  identify  potential  additional  product 
candidates and seek regulatory approvals for our current and future product candidates. All operations and capital expenditures will be funded from cash on 
hand,  securities  offerings,  debt  financings  and  payments  we  may  receive  from  out-licenses,  collaborations  or  other  strategic  arrangements.  Elevated 
worldwide inflation rates that began in mid-2021 and continue to persist may also exacerbate the substantial operating and capital expenditures that we face 
to advance our current and future product candidates.

There is no assurance that we will be successful in raising any necessary additional capital on terms that are acceptable to us, or at all, particularly due to 
the well-documented, ongoing sector-wide weakness in the biotech markets that began in early 2021. If we are unable to develop and commercialize any 
product candidates and generate sufficient revenue or raise capital, we could be forced to reduce staff, delay, scale back or discontinue product development 
and  clinical  studies,  sacrifice  attractive  business  opportunities,  cease  operations  entirely  and  sell,  or  otherwise  transfer,  all  or  substantially  all  of  our 
remaining assets, which would likely have a material adverse impact on our business, results of operations, financial condition and share price. 

We expect our collaboration with Gilead to be a critical part of the development, manufacture and commercialization of our product candidates. If this 
collaboration is unsuccessful, our business could be adversely affected.

In October 2023, we entered into the Gilead Collaboration Agreement with Gilead, whereby Gilead exclusively licensed to us its HPI program and NNPI 
program, while retaining opt-in rights to these programs, and will have an option to take an exclusive license, on a program-by-program basis, to all of our 
other current and future pipeline 

20

 
 
 
programs during the collaboration term. In connection with the entry into the Gilead Collaboration Agreement, we and Gilead also entered into a common 
stock purchase agreement and an investor rights agreement. Our agreements and relationship with Gilead pose a number of risks, including, but not limited 
to, the following:

•

•

•

•

•

•

•

Conflicts may arise between us and Gilead, such as conflicts regarding the indications to pursue or concerning the clinical data supporting an 
opt-in decision, the commercial potential of any optioned investigational products, the interpretation of financial provisions or the ownership 
of intellectual property developed during the collaboration. Any such conflicts could slow or prevent the development or commercialization 
of our investigational products.

If the collaboration with Gilead does not result in the successful development and commercialization of products or if Gilead terminates the 
Gilead  Collaboration  Agreement  with  us,  we  may  not  receive  any  future  research  funding  or  milestone  or  royalty  payments  under  the 
collaboration. If we do not receive the funding we expect under these agreements, our development of our investigational products could be 
delayed and we may need additional resources to develop our investigational products.

We will be heavily dependent on Gilead for further development and commercialization of the investigational products from the programs 
that it opts into.

We may not be successful in this collaboration due to various other factors, including our ability to demonstrate proof of concept in one or 
more clinical studies so that Gilead will exercise its option to these programs. In addition, even if we demonstrate clinical proof of concept of 
a candidate, Gilead may choose not to exercise its option.

Gilead has the right to designate two directors for appointment to our board of directors pursuant to the terms of the investor rights agreement 
and owns approximately 19.9% of our outstanding common stock. Gilead also has the right to acquire additional shares from us, and in the 
open market, up to an amount resulting in Gilead owning a total of 35% of our outstanding common stock. As a result, Gilead may be able to 
exert significant influence over us.

Gilead  could  independently  develop,  or  develop  with  third  parties,  products  that  compete  directly  or  indirectly  with  our  investigational 
products if Gilead believes that competitive products are more likely to be successfully developed or can be commercialized under terms that 
are more economically attractive than ours.

Because Gilead has an option to all of our current, and future, pipeline programs during the collaboration term, it may be difficult for us to 
enter into new collaborations.

Nonclinical and clinical studies required for our product candidates are expensive and time-consuming and may fail to demonstrate the level of safety 
and efficacy necessary for product approval. 

Before we or any commercial partners can obtain FDA approval (or other foreign approvals) necessary to sell any of our product candidates, we must show 
that each potential product is safe and effective. To meet these requirements, we must conduct extensive nonclinical and sufficient, well-controlled clinical 
studies. 

The  results  of  laboratory  and  nonclinical  studies  may  not  be  representative  of  disease  behavior  in  a  clinical  setting  and  may  not  be  predictive  of  the 
outcomes of our clinical studies. In addition, the results of early clinical studies of product candidates may not be predictive of the results of later-stage 
clinical studies.

Conducting nonclinical and clinical studies is a lengthy, time consuming and expensive process. The length of time varies substantially according to the 
type, complexity, novelty, and intended use of the product candidate, and often can be several years or more. In addition, failure or delays can occur at any 
time during the nonclinical and clinical study process, resulting in additional operating expenses or harm to our business. 

The commencement and rate of completion of clinical studies might be delayed by many factors, including, for example:

•

•

•

delays in reaching agreement with regulatory authorities on study design;

delays in reaching agreement on acceptable terms with prospective CROs and clinical study sites;

failure to demonstrate efficacy or the emergence of unforeseen safety issues;

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•

•

•

•

•

•

insufficient  quantities  of  qualified  materials  under  current  good  manufacturing  practice  (cGMP)  for  use  in  clinical  studies  due  to 
manufacturing challenges, delays or interruptions in the supply chain;

slower than expected rates of patient recruitment or failure to recruit a sufficient number of eligible patients, which may be due to a number 
of  reasons,  including  the  size  of  the  patient  population,  the  proximity  of  patients  to  clinical  sites,  the  eligibility  criteria  for  the  study,  the 
design of the clinical study, and other potential drug candidates being studied;

delays in patients completing participation in a study or return for post-treatment follow-up for any reason, including, product side effects or 
disease progression;

modification of clinical study protocols;

delays,  suspension,  or  termination  of  clinical  studies  by  the  institutional  review  board  or  ethics  committee  responsible  for  overseeing  the 
study at a particular study site; and

government  or  other  regulatory  agency  delays  or  clinical  holds  requiring  suspension  or  termination  of  our  clinical  studies  due  to  safety, 
tolerability or other issues related to our product candidates.

The failure of nonclinical and clinical studies to demonstrate safety and effectiveness of a product candidate for the desired indications, whether conducted 
by us or by a CRO, would harm the development of that product candidate and potentially other product candidates. This failure could cause us to abandon 
a product candidate and could delay development of other product candidates. Any delay in, or failure of, our nonclinical studies or clinical studies could 
delay, or preclude, the filing of our NDAs and comparable applications with the FDA and foreign regulatory agencies, as applicable, and materially harm 
our business, prospects, financial condition and results of operations.

We rely on CROs to conduct some of our nonclinical and clinical studies due to our lack of suitable facilities and resources. In addition, parts of our 
business are reliant on CROs, vendors, suppliers and other service providers in locations outside of the United States, including China.

We do not have sufficient facilities or resources to conduct all our anticipated nonclinical and clinical studies internally. As a result, we contract with CROs 
to conduct a significant portion of the nonclinical and clinical studies required for regulatory approval for our product candidates. Our reliance on CROs 
reduces our control over these activities but does not relieve us of our responsibilities. For example, we are responsible for ensuring that each of our studies 
is conducted in accordance with the applicable protocol, legal and regulatory requirements and scientific standards, including, in the case of clinical studies, 
good clinical practices, even if the study is conducted by a CRO. In the event CROs fail to perform their duties in such a fashion or we are unable to retain 
or continue with CROs on acceptable terms, we may be unable to complete our clinical studies and may fail to obtain regulatory approval for our product 
candidates.

In addition, these CROs may also have relationships with other entities, some of which may be our competitors. CRO personnel are not our employees, and 
except for remedies available to us under our agreements with such third parties, we cannot control whether they devote sufficient time and resources to our 
clinical and nonclinical studies. If these 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, regulatory 
requirements or for other reasons, our research, nonclinical or clinical studies may be extended, delayed or terminated and we may not be able to obtain, or 
may  be  delayed  in  obtaining,  regulatory  approvals  for  our  product  candidates,  any  of  which  could  materially  harm  our  business,  prospects,  financial 
condition and results of operations.

Furthermore, we are exposed to a number of risks related to our CROs, vendors, suppliers and other service providers that are located outside of the United 
States, many of which may be beyond our control. These risks include:

•

•

•

business  interruptions  resulting  from  geopolitical  actions  such  as  the  war  between  Russia  and  Ukraine,  the  Israel-Hamas  war,  as  well  as 
tariffs, other wars, acts of terrorism, natural disasters or outbreaks of disease;

different regulatory requirements for drug approvals or increased scrutiny on CROs located in foreign countries, including China;

different standards of care in various countries that could complicate the evaluation of our product candidates;

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•

•

•

•

•

•

•

•

different U.S. and foreign drug import and export rules;

different reimbursement systems and different competitive drugs indicated to treat the indication for which our product candidates are being 
developed;

reduced protection for intellectual property rights in certain countries;

unexpected changes in tariffs, trade barriers and regulatory requirements;

compliance with the United States Foreign Corrupt Practices Act (the FCPA) and other anti-corruption and anti-bribery laws;

compliance with tax, employment, immigration and labor laws for employees living or traveling abroad;

foreign taxes, including withholding of payroll taxes; and

foreign currency fluctuations and compliance with foreign currency exchange rules, which could result in increased operating expenses and 
reduced revenues, and other obligations incident to doing business in another country.

Top-line or preliminary data may not accurately reflect the final results of a particular study.

We  may  publicly  disclose  top-line  or  preliminary  data  based  on  analysis  of  then-available  efficacy,  tolerability,  PK  and  safety  data,  and  the  results  and 
related findings and conclusions are subject to change following a more comprehensive review of the data related to the particular study. We also make 
assumptions,  estimates,  calculations  and  conclusions  as  part  of  our  data  analyses,  and  we  may  not  have  received  or  had  the  opportunity  to  fully  and 
carefully evaluate all data prior to release. As a result, the top-line or preliminary results that we report may differ from final results of the same studies or
different conclusions or considerations may qualify such results once additional data have been received and fully evaluated. Top-line data also remains 
subject to audit and verification procedures that may result in the final data differing materially from previously published preliminary data. As a result, 
top-line and preliminary data should be viewed with caution until the final data are available.

In addition to top-line or preliminary results, the information that we may publicly disclose regarding a particular nonclinical or clinical study is based on 
extensive  information,  and  you  or  others  may  not  agree  with  what  we  determine  is  the  material  or  otherwise  appropriate  information  to  include  in  our 
disclosure. In addition, any information we determine not to disclose may ultimately be deemed significant with respect to future decisions, conclusions, 
views, activities or otherwise regarding a particular drug, drug candidate or our business. If the top-line or preliminary data that we report differ from final 
results, or if others, including regulatory authorities, disagree with, or do not accept, the data or conclusions reached, our ability to obtain approval for, and 
commercialize, our product candidates may be harmed or delayed, which could harm our business, financial condition, operating results or prospects.

We rely on third parties to formulate and manufacture our product candidates and products that we study in combination with our product candidates. 
Our use of third parties may increase the risk that we will not have sufficient quantities of our product candidates or other products on time or at an
acceptable cost.

We rely on third-party manufacturers to supply the quantities of our investigational product candidates used in our clinical and nonclinical studies. If any 
product candidate we develop or acquire in the future receives FDA or other regulatory approval, we expect to continue our reliance on one or more third-
party contractors to manufacture our products. If, for any reason, we are unable to rely on any third-party sources we have identified to manufacture our 
product candidates, we would need to identify and contract with additional or replacement third-party manufacturers to manufacture drug substance and 
drug product for nonclinical, clinical and commercial purposes. We may be unsuccessful in identifying additional or replacement third-party manufacturers, 
or in negotiating acceptable terms with any that we do identify. If we are unable to establish and maintain manufacturing capacity, the development and 
sales of our products and our financial performance may be materially and adversely affected.

We are exposed to the following risks with respect to the manufacture of our product candidates:

•

We will need to identify manufacturers for commercial supply on acceptable terms, which we may be unable to do because the number of 
potential manufacturers is limited, and the FDA must evaluate and approve any new or replacement contractor. 

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•

•

•

•

•

•

•

Any third-party manufacturers with whom we contract might be unable to formulate and manufacture our product candidates in the volume 
and quality required to meet our nonclinical, clinical and, if approved, commercial needs in a timely manner.

Any  third-party  manufacturers  with  whom  we  contract  might  not  perform  as  agreed  or  might  not  remain  in  the  contract  manufacturing 
business for the time required to supply our products.

One or more of any third-party manufacturers with whom we contract could be foreign, which increases the risk of shipping delays and adds 
the risk of import restrictions.

We  do  not  have  complete  control  over,  and  cannot  ensure,  any  third-party  manufacturers’  compliance  with  cGMP  and  other  government 
regulations and corresponding foreign requirements, including periodic FDA and state regulatory inspections.

We  may  be  required  to  obtain  intellectual  property  rights  from  third  parties  to  manufacture  our  product  candidates,  and  if  any  third-party 
manufacturer  makes  improvements  in  the  manufacturing  process  for  our  product  candidates,  we  may  not  own,  or  may  have  to  share,  the 
intellectual property rights to the innovation.

We  may  be  required  to  share  our  trade  secrets  and  know-how  with  third  parties,  increasing  risk  of  misappropriation  or  disclosure  of  our 
intellectual property by or to third parties.

When contracting with third-party manufacturers, we might compete with other companies for access to these manufacturers’ facilities and 
might be subject to manufacturing delays if the manufacturers give other clients higher priority than we are given.

Each of these risks could delay our development efforts, nonclinical studies and clinical studies or the approval, if any, of our product candidates by the 
FDA or applicable non-U.S. regulatory authorities and the commercialization of our product candidates. This could result in higher costs or deprive us of 
potential product revenues and materially harm our business, financial condition and results of operations.

If we lose key management personnel and cannot recruit and retain similarly qualified replacements, our business may materially suffer.

We are highly dependent on the services of our executive officers. Our employment agreements with our executive officers do not ensure their retention. 
We do not currently maintain, nor do we intend to obtain in the future, “key person” life insurance that would compensate us in the event of the death or 
disability of any of the members of our management team. Our executive officers are critical to our success, and unanticipated loss of any of these key 
employees could have a material adverse impact on our business, financial condition and results of operations. 

Our collaboration partners might delay, prevent or undermine the success of our product candidates.

Our operating and financial strategy for the development, nonclinical and clinical testing, manufacture and commercialization of drug candidates heavily 
depends on collaborating with corporations, academic institutions, licensors, licensees, and other parties. However, there can be no assurance that we will 
successfully establish or maintain these collaborations. If a collaboration is terminated, replacement collaborators might not be available on attractive terms, 
or at all. 

The  activities  of  any  collaborator,  including  Gilead,  will  not  be  within  our  control  and  might  not  be  within  our  power  to  influence.  There  can  be  no 
assurance that any collaborator will perform its obligations to our satisfaction or at all, that we will derive any revenue or profits from these collaborations, 
or that any collaborator will not compete with us. If any collaboration, including the Gilead Collaboration, is unsuccessful, we might require substantially 
greater capital to undertake development and marketing of our proposed products and might not be able to develop and market these products effectively, if 
at all. In addition, if Gilead does not opt-in to a program, it might lead to significant delays in introducing proposed products into certain markets and/or 
reduced sales of proposed products in such markets.

We may not be successful in establishing and maintaining collaborations, which could adversely affect our ability to develop certain of our product 
candidates.

Developing  pharmaceutical  products,  conducting  clinical  studies,  obtaining  regulatory  approval  and  commercializing  those  products  are  expensive  and 
lengthy  undertakings  that  require  significant  resources  and  expertise.  We  may  seek  to  enter  into  collaborations,  including  licensing  or  partnering 
arrangements, with other companies to support the development and commercialization of any or multiple of our programs that Gilead declines to opt into 
or to obtain financing or share costs on these programs. If we are unable to enter into such collaborations on acceptable terms, if 

24

 
at all, we may be unable to advance certain of our product candidates through further nonclinical or clinical development. We expect to face competition in 
seeking appropriate partners. Moreover, collaboration arrangements are complex and time consuming to negotiate, document and implement and they may 
require  substantial  resources  to  maintain.  We  may  not  be  successful  in  our  efforts  to  establish  and  implement  collaborations  or  other  alternative 
arrangements for the development of our product candidates that Gilead declines to opt into.

If we are unable to reach agreement on favorable terms with a suitable collaboration partner for any of our product candidates that Gilead declines to opt 
into, we may need to limit the number of our product candidates to advance through further nonclinical or clinical development. Failure to achieve such 
successful  collaborations  would  limit  our  options  for  support  of  the  development  and  commercialization  of  our  programs  and  for  financing  and  would 
likely have a material adverse impact on our business, results of operations, financial condition and share price.  

We rely on data provided by third parties that has not been independently verified and could prove to be false, misleading, or incomplete.

We rely on third-party vendors, scientists, investigators and collaborators to provide us with significant data and other information related to our projects, 
nonclinical studies and clinical studies, and our business. If these third parties provide inaccurate, misleading, or incomplete data, our business, prospects, 
and results of operations could be materially and adversely affected.

Significant  disruptions  of  information  technology  systems  or  breaches  of  data  security,  including  cybersecurity  incidents,  could  materially  and 
adversely affect our business, results of operations and financial condition.

We collect and maintain information in digital form and are increasingly dependent on information technology systems and infrastructure to operate our 
business. In the ordinary course of our business, we collect, store and transmit large amounts of confidential information, including intellectual property, 
proprietary business information and personal information. It is critical that we do so in a secure manner to maintain the confidentiality and integrity of 
such confidential information. We have outsourced elements of our information technology infrastructure and, as a result, a number of third-party vendors 
may or could have access to our confidential information. Our internal information technology systems and infrastructure, and those of our current and any 
future collaborators, contractors and consultants and other third parties on which we rely, are vulnerable to damage from computer viruses, malware, natural 
disasters, terrorism, war, telecommunication and electrical failures, cyberattacks, cybersecurity incidents or cyber intrusions over the Internet, attachments 
to emails, persons inside our organization, or persons with access to systems inside our organization.

The  risk  of  a  cybersecurity  incident  or  security  breach  or  disruption,  particularly  through  cyberattacks  or  cyber  intrusion,  has  escalated  as  the  number, 
intensity and sophistication of attempted attacks and intrusions from around the world have increased. In addition, the prevalent use of mobile devices that 
access confidential information increases the risk of data security breaches, which could lead to the loss of confidential information or other intellectual 
property. The costs to us to mitigate network security problems, bugs, viruses, worms, malicious software programs and security vulnerabilities or incidents 
could be significant, and our efforts to address these problems may not be successful. If unsuccessful, these problems could cause interruptions, delays, 
cessation of service and other harm to our business and our competitive position, including material disruption of our product development programs. For 
example, any loss of clinical study data from completed or ongoing or planned clinical studies could result in delays in our regulatory approval efforts and 
significantly increase our costs to recover or reproduce the data.

If  a  computer  security  breach  affects  our  systems  or  results  in  the  unauthorized  release  of  personally  identifiable  information,  our  reputation  could  be 
materially damaged. In addition, such a breach may require notification to governmental agencies, the media or individuals pursuant to various federal, 
state  and  non-U.S.  privacy  and  security  laws,  if  applicable,  including  the  Health  Insurance  Portability  and  Accountability  Act  of  1996  (HIPAA),  as 
amended  by  the  Health  Information  Technology  for  Clinical  Health  Act  of  2009,  and  its  implementing  rules  and  regulations,  as  well  as  regulations 
promulgated by the Federal Trade Commission, state breach notification law and the EU GDPR. We would also be exposed to a risk of loss or litigation and 
potential liability, which could materially adversely affect our business, results of operations and financial condition.

Research,  development  and  commercialization  goals  may  not  be  achieved  in  the  timeframes  that  we  publicly  estimate,  which  could  have  an  adverse 
impact on our business and could cause our stock price to decline.

We  set  goals  and  make  public  statements  regarding  our  expectations  on  timing  of  certain  accomplishments,  developments  and  milestones  under  our 
research and development programs. The actual timing of these events can vary significantly due to a number of factors, including, the amount of time, 
effort  and  resources  committed  to  our  programs  by  us  and  any  collaborators  and  the  uncertainties  inherent  in  the  clinical  development  and  regulatory 
approval process. As a result, there can be no assurance that we or any collaborators will initiate or complete clinical 

25

 
development activities, make regulatory submissions or receive regulatory approvals as planned or that we or any collaborators will be able to adhere to our 
current schedule for the achievement of key milestones under any of our programs. If we or any collaborators fail to achieve one or more of the milestones 
as planned, or Gilead does not opt-in to any of our programs, our business could be materially and adversely affected, and the price of our common stock 
could decline.

Developments by competitors might render our product candidates or technologies obsolete or non-competitive.

The pharmaceutical and biotechnology industries are intensely competitive. In addition, the clinical and commercial landscapes for recurrent genital herpes, 
HDV,  HBV  and  transplant-related  herpesviruses  are  rapidly  changing;  we  expect  new  data  from  commercial  and  clinical-stage  products  to  continue  to 
emerge. We compete with organizations, some with significantly more resources, who are developing competitive product candidates. If our competitors 
develop effective treatments for recurrent genital herpes, HDV, HBV, transplant-related herpesviruses or any other indication or field we might pursue, and 
successfully commercialize those treatments, our business and prospects could be materially harmed.  

Other companies with products using the same or similar mechanisms of action as ours may produce negative clinical data, which would adversely 
affect public and clinical communities’ perceptions of our product candidates, and may negatively impact regulatory approval of, or demand for, our 
potential products.

Negative data from clinical studies using a competitor’s product candidates with the same or similar mechanisms of action as ours could adversely impact 
the perception of the therapeutic use of our product candidates and our ability to enroll patients in clinical studies. 

The clinical and commercial success of our potential products will depend in part on the public and clinical communities’ acceptance of novel classes of 
product candidates. Moreover, our success depends upon physicians prescribing, and their patients being willing to receive, treatments that involve the use 
of our product candidates we may develop in lieu of, or in addition to, existing treatments with which they are already familiar and for which more clinical 
data  may  be  available.  Adverse  events  in  our  nonclinical  or  clinical  studies  or  those  of  our  competitors  or  of  academic  researchers  utilizing  the  same 
mechanisms of action as our product candidates, even if not ultimately attributable to our product candidates, and any resulting publicity could result in 
increased governmental regulation, unfavorable public perception, potential regulatory delays in the testing or approval of our product candidates, stricter 
labeling requirements for our product candidates that are approved, if any, and a decrease in demand for any such products.

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

We have net operating loss carryforwards due to prior period losses generated before January 1, 2024 which if not utilized will begin to expire in 2027 for 
net operating loss carryforwards prior to 2018. If we are unable to generate sufficient taxable income to utilize our net operating loss carryforwards, pre-
2018 carryforwards could expire unused and be unavailable to offset future income tax liabilities.

Under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended (the Code), a corporation that undergoes an “ownership change” (generally 
defined as a greater than 50% change (by value) in its equity ownership over a three-year period) is subject to annual limitations on its ability to use its pre-
change net operating loss carryforwards and other pre-change tax attributes (such as research tax credits) to offset its post-change income or taxes. We have 
experienced ownership changes in the past, and recent and future equity issuances may result in additional ownership change. Accordingly, some of our net 
operating losses or credits could expire unutilized, and our ability to utilize our net operating losses or credits to offset U.S. federal taxable income could be 
limited, which would result in increased future tax liability to us. We may also be subject to similar limitations at the state level.

Risks Related to Our Regulatory and Legal Environment

We are and will be subject to extensive and costly government regulation and the failure to comply with these regulations may have a material adverse 
effect on our operations and business.

Our product candidates are subject to extensive and rigorous domestic government regulation, including regulation by the FDA, the Centers for Medicare 
and Medicaid Services, other divisions of the U.S. Department of Health and Human Services, the U.S. Department of Justice, state and local governments, 
and their respective foreign equivalents. Both before and after approval of any product, we and our collaborators, suppliers, contract manufacturers and 
clinical investigators are subject to extensive regulation by governmental authorities in the United States and other countries, covering, among other things, 
testing,  manufacturing,  quality  control,  clinical  studies,  post-marketing  studies,  labeling,  advertising,  promotion,  distribution,  import  and  export, 
governmental pricing, price reporting and rebate requirements. Failure to comply with applicable requirements could result in one or more of the following 
actions: 

26

 
warning or untitled letters; unanticipated expenditures; delays in approval or refusal to approve a product candidate; voluntary or mandatory product recall; 
product seizure; interruption of manufacturing or clinical studies; operating or marketing restrictions; injunctions; criminal prosecution and civil or criminal 
penalties, including fines and other monetary penalties; exclusion from federal health care programs such as Medicare and Medicaid; adverse publicity; and 
disruptions to our business. 

If we or our collaborators obtain regulatory approval for a particular product, the approval might limit the intended medical uses for the product, limit our 
ability to promote, sell, and distribute the product, require that we conduct costly post-marketing surveillance, and/or require that we conduct ongoing post-
marketing studies. Once obtained, any approvals might be withdrawn, including, for example, if there is a later discovery of previously unknown problems 
with the product, such as a previously unknown safety issue. If we, our collaborators, our contractors or our contract manufacturers fail to comply with
applicable regulatory requirements at any stage during the regulatory process, such noncompliance could result in delays in the approval of applications or 
supplements  to  approved  applications,  refusal  by  a  regulatory  authority  (including  the  FDA)  to  review  pending  market  approval  applications  or 
supplements to approved applications, untitled letters or warning letters, fines, import and export restrictions, product recalls or seizures, injunctions, total 
or  partial  suspension  of  production,  civil  penalties,  withdrawals  of  previously  approved  marketing  applications,  recommendations  by  the  FDA  or  other 
regulatory authorities against governmental contracts, and/or criminal prosecutions.

The regulatory approval processes of the FDA and comparable foreign authorities are lengthy, time consuming and inherently unpredictable, and if we 
or our collaborators are ultimately unable to obtain regulatory approval for our product candidates, our business will be substantially harmed.

We, or any current or future collaborators, cannot assure you that we will receive the approvals necessary to commercialize for sale any of our product 
candidates,  or  any  product  candidate  we  acquire  or  develop  in  the  future.  We  will  need  FDA  approval  to  commercialize  our  product  candidates  in  the 
United States and approvals from applicable regulatory authorities in foreign jurisdictions to commercialize our product candidates in those jurisdictions. 
To obtain FDA approval of any product candidate, we must submit to the FDA an NDA demonstrating that the product candidate is safe and effective for 
its  intended  use.  This  requires  significant  research,  nonclinical  studies,  and  clinical  studies.  Satisfaction  of  the  FDA’s  regulatory  requirements  typically 
takes many years, depends upon the type, complexity and novelty of the product candidate and requires substantial resources for research, development and 
testing. We cannot predict whether our research and clinical approaches will result in drugs that the FDA considers safe and effective for their indicated 
uses. The FDA has substantial discretion in the approval process and might require us to conduct additional nonclinical and clinical testing, perform post-
marketing studies or otherwise limit or impose conditions on any approval we obtain.

The approval process might also be delayed by changes in government regulation, future legislation or administrative action or changes in FDA policy that 
occur  prior  to  or  during  our  regulatory  review.  Delays  in  obtaining  regulatory  approvals  might:  delay  commercialization  of,  and  our  ability  to  derive 
product revenues from, our product candidates; impose costly procedures on us; and diminish any competitive advantages that we might otherwise enjoy.

Even if we comply with all FDA requests, the FDA might ultimately reject one or more of our NDAs. We cannot be sure that we will ever obtain regulatory 
approval and commercialize any of our current or future product candidates. In foreign jurisdictions, we are subject to regulatory approval processes and 
risks similar to those associated with the FDA described above. We cannot assure you that we will receive the approvals necessary to commercialize our 
product candidates for sale outside the United States.

We and our collaborators may be subject, directly or indirectly, to applicable U.S. federal and state anti-kickback, false claims laws, physician payment 
transparency laws, fraud and abuse laws or similar healthcare and security laws and regulations, and health information privacy and security laws, 
which  could  expose  us  or  them  to  criminal  sanctions,  civil  penalties,  contractual  damages,  reputational  harm  and  diminished  profits  and  future 
earnings.

Healthcare providers, physicians and others play a primary role in the recommendation and prescription of any products for which we obtain regulatory 
approval. If we obtain FDA approval for any of our drug candidates and begin commercializing those drugs in the United States, our operations may be 
subject to various federal and state fraud and abuse laws, including the federal Anti-Kickback Statute, the federal False Claims Act, and physician payment 
sunshine laws and regulations. Additionally, we are subject to state and non-U.S. equivalents of each of the healthcare laws described above, among others, 
some of which may be broader in scope and may apply regardless of the payor. These laws may impact, among other things, our proposed sales, marketing 
and education programs. In addition, we may be subject to patient privacy regulation by both the federal government and the states and foreign jurisdictions 
in which we conduct our business. If we fail to comply with any applicable federal, state or foreign legal requirement, we could be subject to penalties.

27

 
Regulators globally are imposing greater monetary fines for privacy violations. The EU GDPR applies to any company established in the EU as well as to 
those outside the EU if they collect and use personal data in connection with the offering goods or services to individuals in the EU or the monitoring of 
their  behavior.  The  EU  GDPR  enhances  data  protection  obligations  for  processors  and  controllers  of  personal  data,  including,  for  example,  expanded 
disclosures  about  how  personal  information  is  to  be  used,  limitations  on  retention  of  information,  mandatory  data  breach  notification  requirements  and 
onerous  new  obligations  on  services  providers.  Noncompliance  with  the  EU  GDPR  may  result  in  monetary  penalties  of  up  to  €20  million  or  4%  of 
worldwide revenue, whichever is higher. The EU GDPR may increase our responsibility and liability in relation to personal data that we process and we 
may  be  required  to  put  in  place  additional  mechanisms  to  ensure  compliance  with  the  EU  GDPR,  including  as  implemented  by  individual  countries. 
Compliance with the EU GDPR and other changes in laws or regulations associated with the enhanced protection of certain types of personal data, such as 
healthcare data or other sensitive information, could greatly increase our cost of developing our products or even prevent us from offering certain products 
in jurisdictions that we may operate in. 

The  California  Consumer  Privacy  Act  (CCPA)  also  created  new  individual  privacy  rights  for  California  consumers  (as  defined  in  the  law)  and  places 
increased  privacy  and  security  obligations  on  entities  handling  personal  data  of  consumers  or  households.  The  CCPA  requires  covered  companies  to 
provide certain disclosures to consumers about its data collection, use and sharing practices, and to provide affected California residents with ways to opt-
out of certain sales or transfers of personal information. While there is currently an exception for protected health information that is subject to HIPAA and 
clinical study regulations, as currently written, the CCPA may impact our business activities. The uncertainty surrounding the implementation of the CCPA 
exemplifies the vulnerability of our business to the evolving regulatory environment related to personal data and protected health information.

Because of the breadth of these laws and the narrowness of the statutory exceptions and safe harbors available, it is possible that some of our business 
activities could be subject to challenge under one or more of such laws. 

Violations of these laws may be punishable by criminal and/or civil sanctions, including penalties, fines and/or exclusion or suspension from federal and 
state healthcare programs such as Medicare and Medicaid and debarment from contracting with the U.S. government. In addition, private individuals have 
the ability to bring actions on behalf of the U.S. government under the federal False Claims Act as well as under the false claims laws of several states.

If any of the physicians or other providers or entities with whom we expect to do business with are found to be not in compliance with applicable laws, they 
may be subject to criminal, civil or administrative sanctions, including exclusions from government funded healthcare programs, which may also adversely 
affect our business.

We face the risk of product liability claims and might not be able to obtain insurance.

Our business exposes us to the risk of product liability claims that are inherent in drug development. If the use of one or more of our product candidates or 
approved drugs, if any, harms people, we might be subject to costly and damaging product liability claims brought against us by clinical study participants, 
consumers, health care providers, pharmaceutical companies or others selling our products. Our inability to obtain sufficient product liability/clinical study 
insurance  at  an  acceptable  cost  to  protect  against  potential  product  liability  claims  could  prevent  or  inhibit  the  commercialization  of  pharmaceutical 
products  we  develop.  We  cannot  predict  all  of  the  possible  harms  or  side  effects  that  might  result  and,  therefore,  the  amount  of  insurance  coverage  we 
maintain might not be adequate to cover all liabilities we might incur. If we are unable to obtain insurance at an acceptable cost or otherwise protect against 
potential  product  liability  claims,  we  will  be  exposed  to  significant  liabilities,  which  might  materially  and  adversely  affect  our  business  and  financial 
position. If we are sued for any injury allegedly caused by our products, our liability could exceed our total assets and our ability to pay. Any successful 
product liability claims brought against us would decrease our cash and may adversely affect our business, stock price and financial condition.

We might be exposed to liability claims associated with the use of hazardous materials and chemicals.

Our research, development and manufacturing activities and/or those of our third-party contractors might involve the controlled use of hazardous materials 
and  chemicals.  Although  we  will  strive  to  have  our  safety  procedures,  and  those  of  our  contractors,  comply  with  federal,  state  and  local  laws  and 
regulations for using, storing, handling and disposing of these materials, we cannot completely eliminate the risk of accidental injury or contamination from 
these materials. In the event of such an accident, we could be held liable for any resulting damages, and any liability could materially and adversely affect 
our business, financial condition and results of operations. In addition, the federal, state and local laws and regulations governing the use, manufacture, 
storage, handling and disposal of hazardous or radioactive materials and waste products might require us to incur substantial compliance costs that could 
materially and adversely affect our business, financial condition and results of operations. 

28

 
Our  employees,  independent  contractors,  consultants,  collaborators  and  CROs  may  engage  in  misconduct  or  other  improper  activities,  including 
noncompliance with regulatory standards and requirements, which could result in significant liability for us and harm our reputation.

We are exposed to the risk of fraud or other misconduct, including failure to:

•

•

•

•

•

comply with applicable regulations of, and provide accurate information to, the FDA or comparable foreign regulatory authorities;

comply with federal and state healthcare fraud and abuse laws and regulations and similar laws and regulations established and enforced by 
comparable foreign regulatory authorities;

comply with the FCPA, the U.K. Bribery Act 2010, the PRC Criminal Law, the PRC Anti-unfair Competition Law and other anti-bribery and 
trade laws;

report financial information and data accurately; or

disclose unauthorized activities.

Misconduct  could  also  involve  the  improper  use  or  misrepresentation  of  information  obtained  during  clinical  studies,  creating  fraudulent  data  in  our 
nonclinical studies or clinical studies or illegal misappropriation of product materials, which could result in regulatory sanctions, delays in clinical studies, 
or serious harm to our reputation. 

It is not always possible to identify and deter misconduct. The precautions we take to detect and prevent this activity may not be effective in controlling 
unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to comply 
with such laws or regulations. Additionally, we are subject to the risk that a person or government could allege such fraud or other misconduct, even if none 
occurred. If any such actions are instituted against us and we are not successful in defending ourselves or asserting our rights, those actions could harm our 
business, results of operations, financial condition and cash flows, including through the imposition of significant fines or other sanctions.

Risks Related to Our Intellectual Property

Our business depends on protecting our intellectual property.

If  we,  our  licensors  and  our  collaborators  do  not  obtain  protection  for  our  respective  intellectual  property  rights,  our  competitors  might  be  able  to  take 
advantage of our research and development efforts to develop competing drugs. Our success, competitive position and future revenues, if any, depend in 
part on our ability and the abilities of our licensors to obtain and maintain patent protection for our products, methods, processes and other technologies, to 
preserve our trade secrets, to prevent third parties from infringing on our proprietary rights and to operate without infringing the proprietary rights of third 
parties.

We rely upon a combination of patents, trade secret protection and contractual arrangements to protect the intellectual property related to our technologies. 
We will only be able to protect our products and proprietary information and technology by preventing unauthorized use by third parties to the extent that 
our patents, trade secrets, and contractual positions allow us to do so. We cannot be certain that we will secure any rights to any issued patents with claims 
that cover any of our proprietary product candidates and technologies. The patent prosecution process is expensive and time-consuming, and we may be 
unable to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner. We could fail to identify patentable 
aspects  of  our  research  and  development  output  before  it  is  too  late  to  obtain  patent  protection  or  before  our  competitors  secure  patents  covering  such 
discoveries. The patent process also is subject to numerous risks and uncertainties, and there can be no assurance that we will be successful in protecting 
our products by obtaining and defending patents.

Composition-of-matter  patents  relating  to  the  active  pharmaceutical  ingredient  are  generally  considered  to  be  the  strongest  form  of  intellectual  property 
protection for pharmaceutical products. Such patents provide protection not limited to any one method of use. Method-of-use patents protect the use of a 
product for the specified method(s) and 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. Formulation patents protect the formulation of a product and do not prevent a competitor from making and 
marketing  a  product  that  has  an  identical  active  pharmaceutical  ingredient  to  our  product  if  the  product  is  formulated  differently  than  the  patented 
formulation.  We  rely  on  a  combination  of  these  and  other  types  of  patents  to  protect  our  product  candidates,  and  there  can  be  no  assurance  that  our 
intellectual property will create and sustain the competitive position of our product candidates.

29

 
Biotechnology and pharmaceutical product patents involve highly complex legal and scientific questions. Any patent applications that we own or license
may fail to result in issued patents. In addition, the U.S. Patent and Trademark Office (USPTO) and patent offices in other jurisdictions often require that 
patent  applications  concerning  pharmaceutical  and/or  biotechnology-related  inventions  are  limited  or  narrowed  substantially  to  cover  only  the  specific 
innovations exemplified in the patent application, thereby limiting the scope of protection against competitive challenges. As a result, even if we or our 
licensors obtain patents, the patents might be substantially narrower than anticipated. 

If  patents  successfully  issue  from  our  applications,  third  parties  may  challenge  their  validity  or  enforceability,  which  may  result  in  such  patents  being 
narrowed,  invalidated,  or  held  unenforceable.  Even  if  our  patents  and  patent  applications  are  not  challenged  by  third  parties,  those  patents  and  patent 
applications may not prevent others from designing around our claims and may not otherwise adequately protect our product candidates. 

Patent and other intellectual property protection is crucial to the success of our business and prospects, and there is a substantial risk that such protections, 
if obtained, will prove inadequate. The legal systems of certain countries, including China, do not always favor the enforcement of patents, trade secrets, 
and other intellectual property rights, particularly those relating to pharmaceutical and biotechnology products, which could make it difficult for us to stop 
infringement of our patents, misappropriation of our trade secrets, or marketing of competing products in violation of our proprietary rights. 

Beyond  the  protection  afforded  by  patents,  we  seek  to  rely  on  trade  secret  protection  and  confidentiality  agreements  to  protect  proprietary  know-how, 
information, or technology that is not covered by our patents. Although our agreements require all of our employees to assign their inventions to us, and we 
require all of our employees, consultants, advisors, collaborators, contractors and any third parties who have access to our trade secrets, proprietary know-
how  and  other  confidential  information  and  technology  to  enter  into  appropriate  confidentiality  agreements,  we  cannot  be  certain  that  our  trade  secrets, 
proprietary know-how and other confidential information and technology will not be subject to unauthorized disclosure or that our competitors will not 
otherwise gain access to or independently develop substantially equivalent trade secrets, proprietary know-how and other information and technology. If we 
are unable to prevent unauthorized disclosure of our intellectual property related to our product candidates and technology 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 and operations.

We may incur substantial costs as a result of litigation or other proceedings relating to our patents and other intellectual property rights.

We  may  in  the  future  be  involved  in  legal  or  administrative  proceedings  involving  our  intellectual  property,  including  infringement  of  our  intellectual 
property by third parties. These lawsuits or proceedings likely would be expensive, consume time and resources and divert the attention of managerial and 
scientific personnel, even if we were successful in stopping the infringement of such patents. There is a risk that these proceedings will decide that such 
patents or other intellectual property rights are not valid and that we do not have the right to stop the other party from using our inventions. There is also the 
risk that, even if the validity of such patents is upheld, the court or administrative agency will refuse to stop the other party on the ground that such other 
party’s activities do not infringe our rights to such patents. If we were not successful in defending our intellectual property, our competitors could develop 
and market products based on our discoveries, which may reduce demand for our products.

We  may  infringe  the  intellectual  property  rights  of  others,  which  may  prevent  or  delay  our  product  development  efforts  and  stop  us  from 
commercializing or increase the costs of commercializing our product candidates.

Our success will depend in part on our ability to operate without infringing the proprietary rights of third parties. Our competitors may have filed, and may 
in the future file, patent applications covering products and technologies similar to ours. Any such patent application may have priority over our patent 
applications,  which  could  further  require  us  to  obtain  rights  from  third  parties  to  issued  patents  covering  such  products  and  technologies.  We  cannot 
guarantee that the manufacture, use or marketing of any product candidates that we develop will not infringe third-party patents.

If a patent infringement suit were brought against us, we may be forced to stop or delay developing, manufacturing, or selling potential products that are 
claimed  to  infringe  a  third  party’s  intellectual  property,  unless  that  third  party  grants  us  rights  to  use  its  intellectual  property.  In  such  cases,  we  may  be 
required to obtain licenses to patents or proprietary rights of others to continue development, manufacture or sale of our products. If we are unable to obtain 
a license or develop or obtain non-infringing technology, or if we fail to defend an infringement action successfully, or if we are found to have infringed a 
valid  patent,  we  may  incur  substantial  costs  and  monetary  damages,  encounter  significant  delays  in  bringing  our  product  candidates  to  market  and  be 
precluded from manufacturing or selling our product candidates, any of which could harm our business significantly.

30

 
The  cost  of  maintaining  our  patent  protection  globally  is  high  and  requires  continuous  review  and  compliance.  We  may  not  be  able  to  effectively 
maintain our intellectual property position throughout the major markets of the world.

The USPTO and foreign patent authorities require maintenance fees, payments and continued compliance with a number of procedural and documentary 
requirements. Noncompliance may result in abandonment or lapse of patents or patent applications and a partial or complete loss of patent rights in the 
relevant jurisdiction. Such a loss could reduce royalty payments for lack of patent coverage from our collaboration partners or may result in competition, 
either of which could have a material adverse effect on our business.

We have made, and will continue to make, certain strategic decisions in balancing the costs and the potential protections afforded by the patent laws of 
certain  countries.  As  a  result,  we  may  not  be  able  to  prevent  third  parties  from  practicing  our  inventions  in  all  countries,  or  from  selling  or  importing 
products made using our inventions in and into the United States or other countries. Third parties may use our technologies in territories in which we have 
not obtained patent protection to develop their own products and may infringe our patents in territories which provide inadequate enforcement mechanisms. 
Such third-party products may compete with our product candidates, and our patents or other intellectual property rights may not be effective or sufficient 
to prevent them from competing. Such competition could materially and adversely affect our business and financial condition.

Intellectual property rights do not address all potential threats to any competitive advantage we may have.

The degree of future protection afforded by our intellectual property rights is uncertain because intellectual property rights have limitations, and intellectual 
property rights may not adequately protect our business or permit us to maintain our competitive advantage. The following examples are illustrative:

•

•

•

•

•

•

•

•

Others may be able to make compounds that are the same as, or similar to, our current or future product candidates but that are not covered 
by the claims of the patents that we own or have exclusively licensed.

We or any of our licensors or strategic partners might not have been the first to make the inventions covered by the issued patents or pending 
patent applications that we own or have exclusively licensed.

We or any of our licensors or strategic partners might not have been the first to file patent applications covering certain of our inventions.

Others may independently develop similar or alternative technologies or duplicate any of our technologies without infringing our intellectual 
property rights.

The prosecution of our pending patent applications may not result in granted patents.

Granted patents that we own or have exclusively licensed may not provide us with any competitive advantages, or may be held invalid or 
unenforceable, because of legal challenges by our competitors.

Patent protection on our product candidates may expire before we are able to develop and commercialize the product, or before we are able to 
recover our investment in the product.

Our competitors might conduct research and development activities in the United States and other countries that provide a safe harbor from 
patent infringement claims for such activities, as well as in countries in which we do not have patent rights and may then use the information 
learned from such activities to develop competitive products for sale in markets where we intend to market our product candidates.

Risks Related to Our Common Stock

Our amended and restated bylaws provide that the Court of Chancery of the State of Delaware will be the sole and exclusive forum for certain types of 
actions and proceedings that may be initiated by our stockholders, which could limit our stockholders’ ability to bring a claim in a judicial forum they 
find favorable for disputes with us or our directors, officers or other employees.

Our amended and restated bylaws provide that, with certain limited exceptions, unless we consent to the selection of an alternative forum, the Court of 
Chancery  of  the  State  of  Delaware  is  the  sole  and  exclusive  forum  for  (1)  any  derivative  action  or  proceeding  brought  on  our  behalf;  (2)  any  action 
asserting a claim of breach of fiduciary duty owed by any of our current or former directors, officers or other employees to us or to our stockholders; (3) 
any  action  asserting  a  claim  arising  pursuant  to  the  Delaware  General  Corporation  Law,  or  our  certificate  of  incorporation  or  bylaws  (as  each  may  be 
amended  from  time  to  time);  or  (4)  any  action  asserting  a  claim  governed  by  the  internal  affairs  doctrine.  Alternatively,  if  such  court  does  not  have 
jurisdiction, the Superior Court of Delaware, or, if such 

31

 
other court does not have jurisdiction, the United States District Court for the District of Delaware, will be the sole and exclusive forum for such actions 
and proceedings. The choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with 
us  or  our  directors,  officers,  or  other  employees,  which  may  discourage  such  lawsuits  against  us  and  our  directors,  officers,  and  other  employees. 
Alternatively, if a court were to find the choice of forum provision contained in our 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,  which  could  have  a  material  adverse  impact  on  our 
business.  The  choice  of  forum  provision  in  our  amended  and  restated  bylaws  will  not  preclude  or  contract  the  scope  of  exclusive  federal  or  concurrent 
jurisdiction for actions brought under the federal securities laws, including the Exchange Act or the Securities Act, or the respective rules and regulations 
promulgated thereunder.

The price of our common stock might fluctuate significantly, and you could lose all or part of your investment.

The price of our common stock fluctuates widely. Continued volatility in the market price of our common stock might prevent a stockholder from being 
able to sell shares of our common stock at or above the price paid for such shares. The trading price of our common stock may continue to be volatile and 
subject  to  wide  price  fluctuations  in  response  to  various  factors,  many  of  which  are  beyond  our  control,  such  as  the  progress,  results  and  timing  of  our 
clinical and nonclinical studies and other studies involving our product candidates, the success or failure of our product candidates, the receipt or loss of 
required regulatory approvals for our product candidates, the availability of capital or the other risks discussed in this “Risk Factors” section. 

Item 1B. Unresolved Staff Comments

None.

Item 1C. Cybersecurity

Risk Management and Strategy

We  recognize  the  critical  importance  of  developing,  implementing,  and  maintaining  robust  cybersecurity  measures  to  help  maintain  the  security, 
confidentiality,  integrity,  and  availability  of  our  business  systems  and  confidential  information,  including  personal  information  and  intellectual  property. 
Our cybersecurity program includes systems and processes that are designed to assess, identify and manage material risks from cybersecurity threats and 
includes:  maintenance  and  monitoring  of  information  security  policies  aligned  with  global  regulatory  controls;  user  and  employee  awareness  of  cyber 
policies  and  practices;  simulated  phishing  exercises;  information  systems  configuration  management;  identity  and  information  asset  protection; 
infrastructure  security  systems;  and  cyber  threat  operations  with  regular  monitoring  and  threat  hunting.  This  program  includes  processes  to  oversee  and 
identify material risks from cybersecurity threats associated with our use of third-party service providers. We also maintain a cyber incident response plan 
designed to assist us in identifying, responding to and recovering from cybersecurity incidents. We use the findings from these and other processes to help 
us  improve  our  information  security  practices,  procedures  and  technologies.  We  also  collaborate  with  third  parties  to  assess  the  effectiveness  of  our 
cybersecurity  program.  These  include  cybersecurity  assessors,  consultants,  and  other  external  cybersecurity  experts  to  assist  in  the  identification, 
verification, and validation of material risks from cybersecurity threats, as well as to support associated mitigation plans when necessary.

Cybersecurity  is  integrated  into  our  overall  risk  management  systems,  including  our  annual  enterprise  risk  management,  internal  controls,  business 
continuity  and  crisis  management,  third-party  risk  management,  insurance  risk  management,  and  employee  compliance  processes.  Our  Cyber  Incident 
Response  Team,  comprised  of  our  Vice  President,  General  Counsel  and  Corporate  Secretary,  our  Executive  Director,  Accounting  and  Treasury,  and  our 
Executive Director, Information Technology, consults with, or provides input to each of these programs to ensure that material risks from cybersecurity 
threats are appropriately assessed, identified, and managed. 

As of the date of this report, there have been no cybersecurity threats, including as a result of any previous cybersecurity incidents, that have materially 
affected  or  are  reasonably  likely  to  materially  affect  us,  including  our  business,  strategy,  results  of  operations,  or  financial  condition.  For  additional 
description of cybersecurity risks and potential related impacts on the Company, refer to the risk factor captioned “Significant disruptions of information 
technology systems or breaches of data security, including cybersecurity incidents, could materially and adversely affect our business, results of operations 
and financial condition” in “Item 1A. Risk Factors.”

32

 
 
 
 
 
Governance 

While our board of directors has oversight responsibility for risk management generally, the Audit Committee is specifically responsible for overseeing our 
cybersecurity  risk  management  program  to  ensure  cybersecurity  risks  are  identified,  assessed,  managed,  and  monitored.  Our  Executive  Director, 
Information Technology, who has over 15 years of experience in the cybersecurity field, provides periodic updates to the Audit Committee in this regard, 
and details our cybersecurity program supported by key performance indicators across the range of cybersecurity functions related to risk management and 
governance, identity and information asset protection, core security and endpoint security, and cyber threat operations. These updates include descriptions 
of cybersecurity incidents, including those associated with our third-party service providers. The Audit Committee is responsible for updating our full board 
of directors on material risks from cybersecurity incidents or threats. 

Item 2. Properties

We lease office space for corporate and administrative functions and laboratory space in South San Francisco, California under a sublease that expires in 
October 2025. Our China subsidiary leases a registrational office in Shanghai, which expires in March 2024.

We believe these leased facilities are adequate for our current needs and that additional space will be available in the future on commercially reasonable 
terms as needed.

Item 3. Legal Proceedings

We are not a party to any material legal proceedings at this time. From time to time, we may be subject to various legal proceedings and claims that arise in 
the ordinary course of our business activities. Although the results of litigation and claims cannot be predicted with certainty, we do not believe we are 
party to any claim or litigation the outcome of which, if determined adversely to us, would individually or in the aggregate be reasonably expected to have a 
material adverse effect on our business. Regardless of the outcome, litigation can have an adverse effect on us because of defense and settlement costs, 
diversion of management resources and other factors.

Item 4. Mine Safety Disclosures

Not applicable.

33

 
 
 
PART II

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

Market Information for Common Stock

Our common stock is traded under the symbol “ASMB” and is quoted on The Nasdaq Global Select Market.

Holders of Record

As of March 22, 2024, there were 47 stockholders of record, which excludes stockholders whose shares were held in nominee or street name by brokers.

Dividend Policy

We have never declared or paid any dividends and do not anticipate paying any dividends on our common stock in the foreseeable future.

Recent Sales of Unregistered Securities

There were no unregistered sales of equity securities in 2023.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

We did not purchase any of our registered equity securities during the period covered by this Annual Report on Form 10-K.

Reverse Stock Split

On January 31, 2024, following approval by our stockholders, our board of directors approved the implementation of a reverse stock split of our common 
stock at a ratio of 1-for-12 (the Reverse Stock Split). The Reverse Stock Split was effective as of February 9, 2024, and our common stock began trading on 
the Nasdaq Global Select Market on a post-split basis on February 12, 2024. All share and per share amounts of our common stock presented in this Annual 
Report on Form 10-K have been retroactively adjusted to reflect the Reverse Stock Split.

Item 6. [Reserved]

34

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

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our consolidated financial 
statements  and  the  related  notes  thereto  and  other  financial  information  appearing  elsewhere  in  this  Annual  Report  on  Form  10-K.  The  following 
discussion  contains  forward-looking  statements  that  involve  risks  and  uncertainties.  Our  actual  results  could  differ  materially  from  those  expressed  or 
implied in any forward-looking statements as a result of various factors, including those set forth in this Form 10-K under “Item 1A. Risk Factors.”

Overview

We  are  a  biotechnology  company  developing  innovative  therapeutics  targeting  serious  viral  diseases  with  the  potential  to  improve  the  lives  of  patients 
worldwide.  Our  pipeline  includes  two  helicase-primase  inhibitors  (HPI)  targeting  recurrent  genital  herpes,  an  orally  bioavailable  hepatitis  delta  virus 
(HDV) entry inhibitor, a clinical stage capsid assembly modulator (CAM) designed to disrupt the replication cycle of hepatitis B virus (HBV) at several key 
points with the aim of achieving finite treatment and functional cures and research programs focused on the discovery of therapeutics to treat devastating 
viral diseases, including a non-nucleoside polymerase inhibitor (NNPI) targeting transplant-related herpesviruses and a small molecule interferon-α (IFN-α) 
receptor (IFNAR) agonist targeting HBV and HDV.

Our Strategy

We have recruited an accomplished leadership team and research and development organization, with a collective team track record of over 15 approved 
drugs in viral diseases, including hepatitis. Our collaboration with Gilead Sciences, Inc. (Gilead and the Gilead Collaboration) also brings us an industry 
leading  partner  with  a  shared  vision  of  providing  differentiated  antiviral  treatments  to  patients.  For  additional  information  regarding  the  Gilead 
Collaboration, see “Collaboration and License Agreements—Gilead Sciences, Inc.”

Our Clinical Programs and CTA-Enabling Programs

Recurrent Genital Herpes/HSV-1 and HSV-2

In August 2022, we introduced our first programs outside of hepatitis. Among our new viral targets is recurrent genital herpes. Genital herpes can be caused 
by either herpes simplex virus type 1 (HSV-1) or herpes simplex virus type 2 (HSV-2). HSV-1 and HSV-2 are acquired by oral or genital contact either 
during symptomatic or asymptomatic reactivation of the virus. Both viruses replicate in neurons, where they can remain latent for the rest of the patient’s 
life and periodically reactivate, with the virus spreading and replicating in epithelial tissues. Initial infection can be asymptomatic or can be marked by 
symptoms,  including  localized  pain  and  painful  lesions.  Genital  herpes  recurrence  is  common  and  can  cause  painful  genital  lesions  that  can  lead  to 
increased  transmission  and  debilitate  patients,  and  symptoms  may  become  more  serious  with  additional  episodes.  Additional  complications  include 
increased risk of HIV infection, as well as associated psychological stress and isolationary thoughts, depression and suicidal ideation. Immunocompromised 
patients may experience more severe and prolonged symptoms due to increased recurrence rates. While genital herpes can be caused by either HSV-1 or 
HSV-2, recurrences are more likely to be experienced by patients infected by HSV-2. 

There are an estimated 800 million people globally with HSV-2, with an estimated 32 million in the United States and 31 million in France, Germany, Italy 
and  Spain  (collectively,  the  EU4)  and  the  United  Kingdom  (UK).  Only  approximately  13%  of  that  population  is  aware  of  the  infection  and  have  been 
diagnosed. Awareness and diagnostic rates are impacted due to asymptomatic infections and low screening rates in adults and adolescents due to high false 
positive rates with current diagnostic assays.

HPIs are antiviral agents in development for HSV-1 and HSV-2, with a clinically validated mechanism of action. HPIs inhibit the HSV helicase-primase 
complex, which is a unique viral enzyme complex without a human homolog, consisting of helicase, primase and cofactor subunits. Both of these subunits 
have functions that are essential for viral DNA replication and are conserved across HSV-1 and HSV-2. Unlike nucleoside analogs, these compounds do not 
require phosphorylation by the HSV thymidine kinase (TK) and ongoing viral replication to become active drugs. As a result, HPIs are active immediately 
upon reactivation of latent HSV-1 and HSV-2. Furthermore, HPIs are active 

35

 
against TK-deficient HSV-1 and HSV-2, which is a major mechanism of resistance to nucleoside analogs. In February 2023, we announced the nomination 
of  our  first  herpesvirus  development  candidate,  ABI-5366  (5366),  a  long-acting  HPI  for  treatment  of  recurrent  genital  herpes,  to  progress  toward  CTA-
enabling studies. In connection with the Gilead Collaboration, in October 2023, we acquired the rights to ABI-1179 (1179), Gilead’s HPI program, which is 
structurally differentiated from 5366.

Currently, there are three antiviral drugs (all nucleoside analogs) that have been approved in the United States and the EU4/UK for the treatment of genital 
herpes. No new drugs have been approved to treat genital herpes for more than 25 years. In addition to the approved nucleoside analogs, agents such as 
local anesthetics or analgesics may be used to alleviate local symptoms of minor pain and discomfort. 

Nucleoside analogs can be administered as episodic therapy as individual outbreaks arise or daily as chronic suppressive therapy for those with high post-
exposure recurrences. However, these agents are only partially effective at controlling the infection or reducing transmission risk. With current nucleoside 
analog therapies, only one out of three recurrent genital herpes patients with six or more recurrences per year are able to make it through a year of treatment 
without a recurrence. There are still high titer (greater than 104 HSV-2 DNA copies/mL) shedding episodes under this current standard of care for HSV-2, 
which can lead to recurrences and transmission of genital herpes. 

Based on the limitations of current therapies, we see a path to advancing the treatment paradigm for patients suffering from recurrent genital herpes. To 
reach  that  goal,  we  identified  an  opportunity  to  develop  a  potent,  long-acting  HPI  for  recurrent  genital  herpes,  5366,  which  has  demonstrated  a  strong 
nonclinical  profile,  with  low  nanomolar  potency  in  vitro  against  both  HSV-1  and  HSV-2  clinical  isolates,  exceptionally  low  plasma  clearance  rates  in 
multiple nonclinical models and a projected human half-life of more than seven days. This nonclinical profile has led us to target 5366 for development as a 
long-acting treatment with the potential to be administered orally or as an injectable. 

To date, 5366 has also demonstrated a favorable nonclinical safety profile in Good Laboratory Practice (GLP) toxicology studies, with high safety margins 
and minimal potential for off-target effects. We currently anticipate the initiation of clinical studies with 5366 by mid-2024.

In addition, we are also advancing 1179, a second, structurally-differentiated HPI with single digit nM potency against HSV-1 and HSV-2 and a nonclinical 
pharmacokinetics  (PK)  profile  strongly  supporting  a  potential  long-acting  treatment  by  oral  and  injectable  administration.  GLP  toxicology  studies  are 
underway and clinical studies are expected to begin by the end of 2024.

Our HBV and HDV Programs

The World Health Organization (WHO) estimates that 296 million people worldwide are chronically infected with HBV as of 2019, and 1.5 million new 
infections occur each year. HBV is a leading global cause of chronic liver disease and liver transplants, and the WHO estimates that 820,000 people died in 
2019 from HBV, mostly due to cirrhosis and hepatocellular carcinoma. Of the 296 million people living with chronic HBV infection, only approximately 
30.4 million, or 10.5%, were aware of their infection, and only approximately 6.6 million, or 22%, of those diagnosed received treatment. HBV is a highly 
prevalent disease that infects more than three times the number of people infected with hepatitis C virus and HIV infections combined, according to the 
WHO.

HDV is a “satellite virus,” because it can only infect people (1) who are already infected with HBV or (2) at the same time as a person is infected with 
HBV. HDV affects a subset of approximately 12 million HBV infected patients. These patients, which comprise an estimated 4.5% of hepatitis B surface 
antigen  (HBsAg)  positive  patients,  experience  a  substantially  increased  disease  burden,  as  they  account  for  18%  of  cirrhosis  and  20%  of  hepatocellular 
carcinoma  associated  with  HBV.  HDV  is  considered  the  most  severe  form  of  hepatitis,  as  70%  of  HDV  patients  progress  to  cirrhosis  within  ten  years. 
While HDV is less prevalent in the United States, it is a significant and serious health problem with inadequate treatment in many parts of Europe, Africa, 
the  Middle  East,  East  Asia  and  parts  of  South  America.  HDV  may  be  significantly  underdiagnosed,  because  there  were  no  HDV-targeted  therapies 
approved until very recently, and the first therapy approved is only approved in the European Union. HDV is known to accelerate disease progression and 
increase the incidence of liver cirrhosis and liver cancer, which results in higher morbidity and mortality rates than HBV alone. 

36

 
The current standard of care for chronic HBV infection, nucleos(t)ide analog reverse transcriptase inhibitors (NrtIs), are taken life-long and reduce, but do 
not eliminate, the virus and result in very low cure rates. No new mechanisms of action (MOA) have been approved for chronic HBV infection in over 25 
years. The focus of our HBV program is to improve outcomes and increase the number of patients diagnosed and treated through the development of finite 
and curative therapies targeting an orthogonal MOA.

The current standard of care treatment for HDV is off-label pegylated IFN-α injected weekly or, in some regions, a large, complex molecule that requires 
daily injections. There are no approved HDV treatments in the United States, and there is only one approved HDV treatment in Europe. We believe a safe 
and effective oral small molecule entry inhibitor would be a significant innovation for patients living with HDV, which face a significant and immediate 
disease burden.

HDV Entry Inhibitor

HDV is a small RNA virus that encodes just two viral proteins and relies on host enzymes as well as the HBsAg from HBV to replicate, which limits the 
number  of  HDV-specific  antiviral  targets.    Similar  to  HBV,  HDV  utilizes  HBsAg  to  enter  hepatocytes  by  binding  the  cellular  transmembrane  protein 
sodium taurocholate co-transporting peptide (NTCP). NTCP is highly expressed on human hepatocytes, where it serves as one of several proteins involved 
in the transport of bile acids. The binding of specific small or large molecules to NTCP has been shown to effectively inhibit the interaction of HBsAg with 
NTCP, which prevents HBV and HDV from infecting hepatocytes.  

The  inhibition  of  HBV  and  HDV  infection  by  molecules  that  bind  NTCP  has  been  demonstrated  in  vitro,  in  animal  models  and  clinically.  Notably, 
Bulevirtide, a peptide blocker of NTCP, is the only approved therapy for HDV (approved in the European Union (the EU). The binding of NTCP-targeted 
HBV/HDV entry inhibitors to NTCP has also been shown to inhibit the transport of certain bile acids into cells, which results in plasma elevations of bile 
acids; this effect has been well tolerated clinically and may serve as a biomarker of pharmacologically active concentrations of drug in the plasma. 

We believe a safe and effective oral small molecule entry inhibitor would be a significant innovation for patients living with HDV and could significantly 
improve treatment uptake and diagnosis rates, especially when compared with currently available injectable products.

In March 2022, we announced our research program focused on a novel, orally bioavailable small molecule approach to inhibit entry of HBV and HDV by 
targeting NTCP, and in September 2023, we nominated ABI-6250 (6250). In nonclinical studies, 6250 demonstrated low nanomolar potency against all 
HBV/HDV genotypes, favorable selectivity for NTCP versus other bile acid transporters, good oral bioavailability and a PK profile in nonclinical species 
projected to support once-daily oral dosing.

At  the  European  Association  for  the  Study  of  the  Liver's  (EASL)  International  Liver  CongressTM  in  June  2023  and  the  International  HBV  Meeting  in 
September  2023,  we  presented  nonclinical  characterization  of  the  potencies  and  properties  of  our  novel  class  of  highly  potent,  small  molecule,  orally-
bioavailable entry inhibitors. We expect to initiate Phase 1a clinical studies of 6250 by the end of 2024.

Capsid Assembly Modulator

HBV is a DNA virus that infects hepatocytes and establishes a reservoir of covalently closed circular DNA (cccDNA), a unique viral DNA moiety that 
resides  in  the  nucleus  of  HBV-infected  hepatocytes  and  is  associated  with  viral  persistence  and  chronic  infection.  No  currently  approved  oral  therapies 
target  cccDNA  activity  directly,  which  makes  molecules  that  can  modulate  cccDNA  generation  or  disrupt  its  function.  As  a  result,  we  have  worked  to 
discover  and  develop  compounds  targeting  the  core  protein,  a  viral  protein  involved  in  numerous  aspects  of  the  HBV  replication  cycle,  including  the 
generation of HBV cccDNA. 

A benchmark for therapeutic agents aiming to decrease cccDNA levels is the use of several key viral antigens as surrogate biomarkers of active cccDNA. 
The same biomarkers can be used in both primary human hepatocytes and patients. On this basis, our next-generation CAM, ABI-4334 (4334), has shown 
nonclinical proof of principle. In a variety of cell culture models, 4334 has demonstrated the ability to reduce production of viral HBV DNA levels as 

37

 
well  as  the  surrogate  markers  for  cccDNA  establishment:  HBV  e  antigen  (HBeAg),  HBV  core-related  antigen  (HBcrAg)  and  viral  pre-genomic  RNA 
(pgRNA).

As a next-generation CAM, 4334 has been optimized to potently disrupt viral replication (MOA #1) and prevent the establishment and replenishment of 
new cccDNA (MOA #2). In contrast, while active against MOA #1, first-generation CAMs have not demonstrated adequate potency to sufficiently block 
cccDNA formation (MOA #2). Further, the current standard of care, NrtIs, impacts the viral life cycle after establishment of cccDNA and can only inhibit 
production  of  new  viral  particles,  and  it  does  so  incompletely.  In  mid-2021,  we  announced  the  selection  of  4334,  which  was  internally  discovered,  for 
clinical development. The chemical scaffold of 4334 is novel and distinct from all our prior CAM candidates.

We believe that 4334 has a best-in-class nonclinical profile, with single-digit nanomolar potency against MOA #1 and MOA #2, pan-genotypic activity, an 
improved resistance profile and a favorable safety profile. Through mechanistic studies presented at multiple conferences, we have demonstrated that 4334 
promotes  the  formation  of  empty  capsids  by  acceleration  of  capsid  assembly,  prevents  the  formation  of  cccDNA  by  disrupting  incoming  capsids,  and 
prematurely disrupts capsids containing duplex linear DNA, the precursor for integrated HBV DNA. 

We expect to initiate Phase 1b clinical studies of 4334 by mid-2024.

Research Programs

Transplant-Associated Herpesviruses

In August 2022, in connection with our announcement of our HPI program, we also introduced our NNPI research program, targeting transplant-associated 
herpesviruses. In a transplant setting, when patients are experiencing immunosuppression, they are at high risk of uncontrolled viral replication and severe 
disease  brought  on  by  one  or  more  herpesviruses,  including  cytomegalovirus  (CMV),  HSV-1,  HSV-2  and  varicella  zoster  virus  (VZV).  Each  of  these 
herpesviruses are highly prevalent, as approximately (1) 60% of transplant patients are CMV-positive; (2) 60% of transplant patients are HSV-positive; and 
(3) 80% of transplant patients are VZV-positive. These viruses establish lifelong latent infections and frequently reactivate in transplant patients due to the 
use of immunosuppressive drugs following the transplant. These uncontrolled viral infections increase the risk of severe disease and serious complications, 
including organ rejection, graft loss and death, and impacted approximately 60,000 patients in 2018 in the United States and EU4/UK.

While there are approved antivirals that are administered in a transplant setting. However, currently approved antivirals are not broad spectrum and pose the 
risk of potentially serious side effects and drug-drug interactions. As a result of these limitations, we identified an opportunity to develop an oral pan-herpes 
NNPI for these transplant-associated herpesvirus infections, which could greatly advance treatment. Our research team has discovered multiple chemical 
series  of  potent,  broad-spectrum  herpesvirus  polymerase  inhibitors.  In  addition,  Gilead  exclusively  licensed  us  its  NNPI  program,  and  we  believe  the 
combined effort will speed candidate nomination and enhance our chance of clinical success. 

IFNAR Agonist

In  July  2022,  we  introduced  our  new  research  program  advancing  a  novel,  small  molecule  IFNAR  agonist  designed  to  selectively  activate  the  IFN-α 
pathway within the liver and offer the convenience of oral dosing. IFN-α is a subcutaneous injectable immune modulatory therapy approved for HBV that 
has demonstrated functional cure in some HBV patients, but its poor tolerability profile significantly limits its use. Substantial side effects include flu-like 
symptoms, cytopenias, serious depression and psychiatric effects. In addition, multiple contraindications limit its use, and it requires weekly injections that 
result in systemic exposure for up to a year. 

By  focusing  exposure  on  the  liver,  our  investigational  IFNAR  agonist  program  aims  to  engage  IFN-α’s  validated  antiviral  and  immune  modulatory 
mechanisms, retaining the efficacy of IFN-α while reducing systemic exposure to improve tolerability. Lead optimization of multiple IFNAR agonists is in 
progress.

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Collaboration and License Agreements

Gilead Sciences, Inc.

On  October  15,  2023,  we  entered  into  an  Option,  License  and  Collaboration  agreement  (the  Gilead  Collaboration  Agreement)  with  Gilead  pursuant  to 
which Gilead (1) exclusively licensed to us its HPI program and its NNPI program, while retaining opt-in rights to these programs and (2) has an option to 
take an exclusive license, on a program-by-program basis, to all of our other current and future pipeline programs. During the 12-year collaboration term 
(subject to payment of certain extension fees) and for a specified period thereafter, Gilead may exercise its opt-in rights, on a program-by-program basis, at 
one of two timepoints—completion of a certain Phase 1 study or completion of a certain Phase 2 study for the first product within the program—upon 
payment of an opt-in fee ranging from $45.0 million to $125.0 million per program depending on the type of program and when the option is exercised. 
Pursuant to the Gilead Collaboration Agreement, Gilead made an $84.8 million upfront cash payment to us. 

If  Gilead  exercises  its  opt-in  right  to  any  current  or  future  program  under  the  collaboration,  we  are  eligible  to  receive  up  to  $330.0  million  in  potential 
regulatory and commercial milestones on that program, in addition to royalties ranging from the high single-digits to high teens, depending on the clinical 
stage  of  the  program  at  the  time  of  the  opt-in.  Following  Gilead’s  exercise  of  its  option  for  each  of  our  programs,  we  may  opt  in  to  cover  40%  of  the 
research and development costs in the United States and share 40% of the profits and operating loss in the United States for products within the program in 
lieu of receiving milestones and royalties for that program in the United States, unless we later opt out of the cost/profit share for the program. Prior to 
Gilead’s potential exercise of its opt-in, we will be primarily responsible for all discovery, research and development on both our programs and the two 
Gilead-contributed programs. Following Gilead’s opt-in, Gilead will control the further discovery, research, development, and commercialization on any 
optioned programs. During the term, Gilead will continue to support the collaboration through extension fees of $75.0 million in each of the third, fifth and 
seventh years of the collaboration.

The Gilead Collaboration Agreement is subject to termination by either party for the other party’s uncured, material breach or insolvency. Subject to certain 
limitations, we and Gilead both have certain termination for convenience rights, upon sufficient prior written notice, with respect to programs that one party 
in-licenses  from  the  other  (subject  to  Gilead’s  option  rights),  and  with  respect  to  Gilead,  for  programs  it  has  option  rights  to  subject  to  certain  time 
limitations  with  respect  to  existing  Company  programs).  Gilead  also  has  a  right  to  terminate  the  collaborative  activities  under  the  Gilead  Collaboration 
Agreement at certain specified points during the collaboration term. Other customary termination rights are further provided in the Gilead Collaboration 
Agreement.

We  and  Gilead  also  entered  into  a  Common  Stock  Purchase  Agreement  and  an  Investor  Rights  Agreement  (together,  the  Gilead  Equity  Agreements), 
pursuant to which Gilead made an upfront equity investment of $15.2 million by purchasing from us 1,089,472 shares of our common stock at a purchase 
price of $13.92 per share. If we complete an equity financing (or series of financings) by July 15, 2024 that results in at least $30 million of proceeds to us, 
then, subject to approval by our stockholders (which was obtained on January 31, 2024), we may require Gilead to purchase additional shares of common 
stock from us in an amount that results in Gilead owning 29.9% of our then-outstanding voting capital stock. If we do not complete the equity financing or 
do not require Gilead to purchase the additional shares, Gilead may elect to purchase additional shares of common stock from us in an amount that results 
in Gilead owning 29.9% of our then-outstanding voting capital stock. The purchase price per share for additional shares purchased by Gilead will be equal 
to the lesser of (1) a 35% premium to the 30-day volume weighted average price immediately prior to the date of purchase or (2) a 35% premium to the 30-
day volume weighted average price immediately prior to delivery by Gilead of notice of the anticipated closing date. The Gilead Equity Agreements also 
include  a  three-year  standstill  provision  and  two-year  lockup  provision,  each  with  customary  exceptions,  and  provide  Gilead  with  certain  other  stock 
purchase rights and registration rights, as well as the right to designate two directors (or, alternatively, board observers at Gilead’s election) to our board of 
directors. In December 2023, Gilead designated Tomas Cihlar, Ph.D. to serve on our board of directors, and in March 2024, Gilead designated Robert D. 
Cook II to serve on our board of directors.

BeiGene, Ltd.

In July 2020, we entered into a Collaboration Agreement (the BeiGene Agreement) with BeiGene, Ltd. (BeiGene), granting BeiGene an exclusive, royalty-
bearing license to develop and commercialize products containing vebicorvir 

39

 
(VBR), ABI-H2158 (2158) and ABI-H3733 (3733) in the People’s Republic of China, Hong Kong, Taiwan and Macau (the Territory).

Under  the  BeiGene  Agreement,  we  and  BeiGene  will  collaborate  on  development  activities  with  respect  to  the  licensed  products  in  accordance  with  a 
mutually agreed upon development plan. 

Pursuant to the terms of the BeiGene Agreement, BeiGene paid us an upfront amount of $40.0 million, and we were eligible to receive up to approximately 
$500.0  million  in  milestone  payments,  comprised  of  up  to  $113.8  million  in  development  and  regulatory  and  $385.0  million  in  net  sales  milestone 
payments. In September 2021, we discontinued development of 2158 following the observation of elevated alanine transaminase (ALT) levels in the Phase 
2  clinical  study  consistent  with  drug-induced  hepatotoxicity,  in  July  2022,  we  discontinued  VBR  because  it  did  not  achieve  functional  cure  or  finite 
treatment in our two- and three-drug combination studies and in March 2023, we prioritized 4334 over 3733 based on data from clinical Phase 1 studies of 
both candidates and chronic toxicology observation for 3733 and announced that we would seek partnering opportunities for the CAMs. In conjunction 
with  the  Gilead  Collaboration  Agreement,  we  elected  to  no  longer  seek  partnering  or  further  development  of  3733.  As  of  our  discontinuation  of  3733 
development, there are no remaining products in development that have been licensed to BeiGene. 

The  BeiGene  Agreement  also  contains  provisions  such  as  representations  and  warranties  of  the  parties,  terms  as  to  governance  of  the  collaboration, 
commercialization and regulatory responsibilities of the parties, and manufacturing and supply, including potential adjustments in the event supply costs 
exceed certain levels. In addition, during the term of the BeiGene Agreement, neither party will commercialize any competing products in the Territory.

BeiGene may terminate the BeiGene Agreement for convenience at any time upon 90 days’ advance written notice to us. The BeiGene Agreement also 
contains customary provisions for termination by either party, including in the event of breach of the BeiGene Agreement, subject to cure.

Indiana University Research and Technology Corporation

In September 2013, we entered into an exclusive license agreement (the IURTC License Agreement) with Indiana University Research and Technology 
Corporation (IURTC) pursuant to which we acquired, with rights to sublicense, the rights to develop and commercialize products associated with multiple 
patents and patent applications covering aspects of our HBV program held by IURTC. As part of this agreement, we were obligated to make milestone 
payments based upon the successful accomplishment of clinical and regulatory milestones. The aggregate amount of all performance milestone payments 
under the IURTC License Agreement, should all performance milestones through development be met, was $0.8 million, with a portion related to the first 
performance milestone having been paid. Under the IURTC License Agreement, we were also obligated to pay IURTC royalties based on net sales of the 
licensed technology ranging from 0.5% to 1.75%. In addition, under the IURTC License Agreement, we paid annual diligence maintenance fees of $0.1 
million. Milestone payments received by IURTC were fully creditable against the annual diligence maintenance fee for the year in which the milestone 
payments were received.

In January 2024, we notified the Indiana University Innovation and Commercialization Office and IURTC that we had decided to terminate the IURTC 
License Agreement. The termination of the License Agreement will be effective on April 11, 2024, 90 days following the delivery of the termination notice.

Operations

We currently have corporate and administrative offices and research laboratory space in South San Francisco, California as well as a registrational office, 
but no employees, in China. 

Since our inception, we have had no revenue from product sales and have funded our operations principally through debt financings prior to our initial 
public offering in 2010 and through equity financings and collaborations since then. Our operations to date have been primarily limited to organizing and 
staffing our company, licensing our product candidates, discovering and developing our product candidates, maintaining and improving our patent portfolio 
and raising capital. 

We have generated significant losses to date, and we expect to continue to generate losses as we develop our product candidates. As of December 31, 2023, 
we had an accumulated deficit of $785.7 million primarily as a result of research 

40

 
and development expenses and general and administrative expenses. Because we do not generate revenue from any of our product candidates, our losses 
will continue as we further develop and seek regulatory approval for, and commercialize, our product candidates. Additionally, we expect our research and 
development expenses to increase over the coming years as we continue the development of our product candidates. As a result, our operating losses are 
likely to be substantial over the next several years and thereafter if none of our product candidates are approved or successfully launched. We are unable to 
predict the extent of any future losses or when we will become profitable, if at all.

Critical Accounting Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which we 
have prepared in accordance with accounting principles generally accepted in the United States. The preparation of these consolidated financial statements 
requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities 
at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. Note 2 to the Consolidated 
Financial  Statements  describes  the  significant  accounting  policies  and  methods  used  in  the  preparation  of  our  consolidated  financial  statements.  We 
evaluate  our  estimates  and  judgments,  including  those  described  in  greater  detail  below,  on  an  ongoing  basis.  We  base  our  estimates  on  historical 
experience and on various other factors that we believe are 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  from  these  estimates  under 
different assumptions or conditions.

Revenue Recognition from Collaboration

We analyze our collaboration arrangements to assess whether such arrangements, or transactions between arrangement participants, involve joint operating 
activities performed by parties that are both active participants in the activities and exposed to significant risks and rewards dependent on the commercial 
success  of  such  activities  or  are  more  akin  to  a  vendor-customer  relationship.  In  making  this  evaluation,  we  consider  whether  the  activities  of  the 
collaboration are considered to be distinct and deemed to be within the scope of the collaborative arrangement accounting standard and those that are more 
reflective  of  a  vendor-customer  relationship  and,  therefore,  within  the  scope  of  the  revenue  with  contracts  with  customers  accounting  standard.  This 
assessment is performed throughout the life of the arrangement based on changes in the responsibilities of all parties in the arrangement.

For arrangements or transactions between arrangement participants determined to be within the scope of the contracts with customers accounting standard, 
we  evaluate  the  term  of  the  arrangement  and  recognize  revenue  when  the  customer  obtains  control  of  promised  goods  or  services  in  a  contract  for  an 
amount that reflects the consideration we expect to receive in exchange for those goods or services. For contracts with customers, we apply the following 
five-step model, each of which requires judgment, in order to determine this amount: (1) identification of the promised goods or services in the contract; (2) 
determination of whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract; (3) 
measurement  of  the  transaction  price,  including  the  constraint  on  variable  consideration;  (4)  allocation  of  the  transaction  price  to  the  performance 
obligations; and (5) recognition of revenue when (or as) we satisfy each performance obligation.

We only apply the five-step model to contracts when it is probable we will collect the consideration we are entitled to in exchange for the goods or services 
we transfer to the customer. As part of the accounting for contracts with customers, we must develop assumptions that require judgment to determine the 
estimated relative standalone selling price (SSP) of each performance obligation identified in the contract. We then allocate the total transaction price to 
each performance obligation based on its SSP and recognize as revenue the amount of the transaction price that is allocated to the respective performance 
obligation when or as the performance obligation is satisfied.

For  recognition  of  revenue  relating  to  the  Gilead  Collaboration  Agreement,  we  determined  the  transaction  price  and  allocated  it  to  a  single  combined 
performance obligation, the discovery, research and development services during the collaboration term. We estimated the SSP of extension fees and opt-in 
rights  pursuant  to  the  Gilead  Collaboration  Agreement  using  significant  estimates,  including  forecasted  revenues  and  costs,  development  timelines, 
discount rates, and probabilities of technical and regulatory success. We concluded none of the options in the contract are performance obligations at the 
outset of the arrangement as they are contingent upon option exercise, are capable of being distinct from the research and development services and are not 
offered  at  a  discount  to  their  SSP.  We  evaluate  each  performance  obligation  to  determine  if  it  can  be  satisfied  at  a  point  in  time  or  over  time,  and  we
measure the services delivered to the customer, which we periodically review based on the progress of the related program. We recognize revenue under the 
Gilead Collaboration Agreement over time using a cost-based input method. Revenue related to certain performance obligations that are satisfied over time 
could be materially impacted as a result of changes in the estimated total research effort required to satisfy those obligations. A 10% change in the total 
estimated 

41

 
effort  required  to  satisfy  the  single  combined  performance  obligation  related  to  the  Gilead  Collaboration  Agreement  would  have  changed  the  related 
revenue recognized during the year ended December 31, 2023 by as much as $0.5 million. The effect of any change made to an estimated input component 
and,  therefore  revenue  recognized,  would  be  recorded  as  a  change  in  estimate.  Such  changes  in  estimate  could  have  a  material  impact  on  the  revenue 
recognized in a future period. In addition, variable consideration (including regulatory and commercial milestones) must be evaluated to determine if it is 
constrained and, therefore, excluded from the transaction price.

Research and Development Expense and Accruals 

As  part  of  the  process  of  preparing  our  consolidated  financial  statements,  we  are  required  to  estimate  certain  research  and  development  expenses.  This 
process  involves  reviewing  quotations  and  contracts,  reviewing  the  terms  of  our  license  agreements,  communicating  with  our  vendors  and  applicable 
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. The majority of our service providers invoice us monthly in arrears for 
services performed or when contractual milestones are met. Payments made prior to the receipt of goods or services to be used in research and development 
are capitalized until the goods or services are received. Such payments are evaluated for current or long-term classification based on when they will be 
realized or consumed. Examples of estimated amortized or accrued research and development expenses include fees to:

•

•

•

contract research organizations (CROs) and other service providers in connection with clinical studies;

contract manufacturing organizations (CMOs) in connection with the production of clinical trial materials; and

vendors in connection with nonclinical development activities.

We base our expenses related to clinical studies on our estimates of the services received and efforts expended pursuant to contracts with multiple research 
institutions and CROs that conduct and manage clinical studies on our behalf. The financial terms of these agreements are subject to negotiation, vary from 
contract to contract and may result in uneven payment flows and expense recognition. Payments under some of these contracts depend on factors such as 
the  successful  enrollment  of  patients  and  the  completion  of  clinical  trial  milestones.  In  either  amortizing  or  accruing  service  fees,  we  estimate  the  time 
period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the 
level of effort varies from our estimate, we adjust the related prepayment or accrual accordingly. Our understanding of the status and timing of services 
performed relative to the actual status and timing of services performed may vary and may result in our reporting changes in estimates in any particular 
period. Adjustments to prior period estimates have not been material for the years ended December 31, 2023 and 2022.

We  have  and  may  continue  to  enter  into  license  agreements  to  access  and  utilize  certain  technology.  In  each  case,  we  evaluate  if  the  license  agreement 
results in the acquisition of an asset or a business. To date, none of our license agreements have been considered to be acquisitions of businesses. For asset 
acquisitions,  the  upfront  payments  to  acquire  such  licenses,  as  well  as  any  future  milestone  payments,  are  immediately  recognized  as  research  and 
development  expense  when  paid,  provided  there  is  no  alternative  future  use  of  the  rights  in  other  research  and  development  projects.  These  license 
agreements  may  also  include  contingent  consideration  in  the  form  of  cash  payments  to  be  made  for  future  milestone  events.  We  assess  whether  such 
contingent consideration meets the definition of a derivative and to date we have determined that such contingent consideration are not derivatives.

42

 
Results of Operations

Comparison of the Years Ended December 31, 2023 and 2022

Collaboration Revenue

The following table summarizes the period-over-period changes in our collaboration revenue (in thousands, except for percentages):

Collaboration revenue

$

7,163    

$

—    

$

7,163  

100 %

Year Ended December 31,

2023

2022

$ Change
2023 vs. 2022

% Change
2023 vs. 2022

Collaboration  revenue  for  the  year  ended  December  31,  2023  includes  the  recognition  of  $4.4  million  for  services  performed  under  the  Gilead 
Collaboration Agreement entered into in October 2023. Additionally, collaboration revenue includes the recognition of $2.7 million of deferred revenue 
allocated  to  3733  under  the  BeiGene  Agreement  upon  discontinuing  development  of  3733,  following  entering  into  the  Gilead  Collaboration,  as  we 
prioritize 4334. There was no revenue for the year ended December 31, 2022.  

Research and Development Expenses 

Research  and  development  expenses  consist  primarily  of  employee-related  expenses,  fees  paid  to  CROs  and  CMOs,  lab  supplies  and  other  third-party 
expenses  that  support  our  research  and  discovery,  nonclinical  and  clinical  activities.  External  costs  represent  a  significant  portion  of  our  research  and 
development expenses, which we track on a program-by-program basis following the nomination of a development candidate. We use our employee and 
infrastructure resources, as well as certain third-party costs, across multiple research and development programs, and we do not specifically allocate these 
costs to our programs. 

The following table summarizes the period-over-period changes in our research and development expenses (in thousands, except for percentages):

Year Ended December 31,

2023

2022

$ Change

2023 vs. 2022

% Change

2023 vs. 2022

External expenses:

Research and discovery
3733
5366
4334
VBR
6250
2158

Total external expenses
Employee and contractor-related expenses
Facility and other expenses

Total research and development expenses

$

$

9,741    
3,383    
2,869    
1,947    
1,755    
421    
226    
20,342    
22,956    
5,602    
48,900    

$

$

10,338    
8,165    
—    
5,195    
6,962    
—    
2,440    
33,100    
31,052    
5,828    
69,980    

$

$

(597 )
(4,782 )
2,869  
(3,248 )
(5,207 )
421  
(2,214 )
(12,758 )
(8,096 )
(226 )
(21,080 )

(6 %)
(59 %)
100 %
(63 %)
(75 %)
100 %
(91 %)
(39 %)
(26 %)
(4 %)
(30 %)

Research and development expenses were $48.9 million for the year ended December 31, 2023 compared to $70.0 million for the year ended December 31, 
2022.  The  $21.1  million  decrease  in  research  and  development  expenses  was  primarily  driven  by  decreases  in  external  expenses  due  to  pausing  further 
development of our CAMs as we sought partnering opportunities after the completion of the Phase 1b trial for 3733 and Phase 1a trial for 4334 and our 
discontinuation  of  the  VBR  and  2158  programs.  We  also  experienced  decreases  in  employee  and  contractor-related  expenses  of  $8.1  million  due  to  the 
termination of employees as part of the reorganization announced in July 2022. This was partially offset by increases in external expenses generated from 
the advancement of 5366 and 6250. 

General and Administrative Expenses

General  and  administrative  expenses  consist  primarily  of  salaries  and  other  related  costs  for  personnel  in  executive,  finance,  accounting,  business 
development, information technology, legal and human resources functions. Other 

43

 
 
 
   
 
 
 
   
   
   
 
 
 
 
   
 
 
 
   
 
 
 
   
   
   
 
 
 
 
     
     
   
 
   
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
 
   
significant  costs  include  facility  costs  not  otherwise  included  in  research  and  development  expenses,  insurance  costs,  legal  fees  relating  to  patents  and 
corporate matters and fees for accounting and consulting services.

The following table summarizes the period-over-period change in our general and administrative expenses (in thousands, except for percentages):

General and administrative expenses

  $

22,909     $

24,134     $

(1,225 )    

(5 %)

Year Ended December 31,

2023

2022

$ Change
2023 vs. 2022

% Change
2023 vs. 2022

General and administrative expenses were $22.9 million for the year ended December 31, 2023, compared to $24.1 million for the year ended December 
31, 2022. The decrease of $1.2 million in general and administrative expenses was primarily due to a $2.2 million decrease in salaries and benefits due to a 
decrease in headcount, largely attributable to the reorganization announced in July 2022. This was partially offset by an increase in legal expenses incurred 
with entering into the Gilead Collaboration. 

Interest and Other Income, Net

Interest income consists of interest earned on our cash and cash equivalents and available-for-sale securities.

The following table summarizes the period-over-period changes in our interest and other income, net (in thousands, except for percentages):

Interest and other income, net

  $

3,451     $

1,022     $

2,429  

238 %

Interest and other income, net was $3.5 million for the year ended December 31, 2023, compared to $1.0 million for the year ended December 31, 2022.
The increase of $2.4 million was primarily due to more interest income earned on marketable securities caused by multiple interest rate increases in 2023 
and a larger portfolio balance after the receipt of $100.0 million upon entering into the Gilead Collaboration in October 2023.  

Year Ended December 31,

2023

2022

$ Change
2023 vs. 2022

% Change
2023 vs. 2022

Liquidity and Capital Resources

Sources of Liquidity

As a result of our significant research and development expenditures and the lack of any FDA-approved products to generate product sales revenue, we 
have  not  been  profitable  and  have  generated  operating  losses  since  we  were  incorporated  in  October  2005.  We  have  funded  our  operations  through 
December 31, 2023 principally through equity financings, raising an aggregate of $618.8 million in net proceeds, and strategic collaborations, raising an 
aggregate of $185.7 million through upfront payments.

Future Funding Requirements

We  expect  our  future  operating  expenses  to  increase  substantially  over  the  coming  years  as  we  continue  to  advance  our  candidates  into  the  clinic.  We 
monitor our cash needs and the status of the capital markets on a continuous basis. From time to time, we opportunistically raise capital and have done so
numerous times since our initial public offering by issuing equity securities. We expect to continue to raise capital when and as needed and at the time and 
in the manner most advantageous to us.

We expect our existing cash, cash equivalents and marketable securities will enable us to fund our operating expenses and capital expenditure requirements 
into the second half of 2025. We have based this estimate on assumptions that may prove to be wrong, and we may utilize our available capital resources 
sooner than we currently expect. Our contractual obligations include operating lease obligations totaling $2.3 million as of December 31, 2023, of which 
$1.2  million  are  short-term.  We  also  enter  into  contracts  in  the  normal  course  of  business  with  CROs  for  clinical  trials  and  CMOs  for  clinical  supply 
manufacturing  and  with  vendors  for  nonclinical  research  studies  and  other  services  and  products  for  operating  purposes,  which  generally  provide  for 
termination within 30 days of notice. 

44

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

•

•

•

•

•

•

the  scope,  progress,  results  and  costs  of  our  ongoing  drug  discovery,  nonclinical  development,  laboratory  testing  and  clinical  studies  of  our 
product candidates and any additional clinical studies we may conduct in the future;

our ability to raise capital despite macroeconomic and geopolitical events impacting financial markets, such as rising inflation, market volatility 
and risk of recession;

our ability to realize future potential benefits pursuant to the Gilead Collaboration and maintain the collaboration;

our ability to manufacture, and to contract with third parties to manufacture, adequate supplies of our product candidates for our clinical studies 
and any eventual commercialization;

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

the  costs  of  preparing,  filing  and  prosecuting  patent  applications  in  the  United  States  and  abroad,  maintaining  and  enforcing  our  intellectual 
property rights and defending intellectual property-related claims.

Identifying potential product candidates and conducting nonclinical testing and clinical studies is a time-consuming, expensive and uncertain process that 
takes  years  to  complete,  and  we  may  never  generate  the  necessary  data  or  results  required  to  obtain  marketing  approval  and  achieve  product  sales.  In 
addition, our product candidates, if approved, may not achieve commercial success. Our commercial revenues, if any, will likely be derived from sales of 
medicines that we do not expect to be commercially available for years, if at all. Accordingly, we will need to continue to rely on additional financings to 
achieve  our  business  objectives.  Adequate  additional  financings  may  not  be  available  to  us  on  acceptable  terms,  or  at  all.  To  the  extent  that  we  raise
additional  capital  through  the  sale  of  equity,  the  ownership  interest  of  our  stockholders  will  be  diluted,  and  the  terms  of  these  securities  may  include 
liquidation  or  other  preferences  that  adversely  affect  the  rights  of  our  common  stockholders.  Debt  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  are  unable  to  raise  additional  funds  when  needed,  we  may  be  required  to  reduce  staff,  delay,  scale  back  or  discontinue  our  product
development and clinical studies or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves. 

Cash Flows 

The following table summarizes our cash flows for the periods presented (in thousands):

Operating activities
Investing activities
Financing activities

Net (decrease) increase in cash and cash equivalents

Operating Activities

Year Ended December 31,

2023

2022

22,743    
(69,138 )  
13,818    
(32,577 )  

$

$

(84,463 )
90,640  
614  
6,791  

$

$

Net cash provided by operating activities was $22.7 million for the year ended December 31, 2023. This was primarily due to proceeds of $90.7 million 
from the upfront payment under the Gilead Collaboration Agreement. This was partially offset by our net loss of $61.2 million, adjusted for $5.1 million 
recognized for stock-based compensation expense.

Net cash used in operating activities was $84.5 million for the year ended December 31, 2022. This was primarily due to our net loss of $93.1 million, 
adjusted for $6.6 million recognized for stock-based compensation expense.  

45

 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
Investing Activities

Net cash used in investing activities for the year ended December 31, 2023 was $69.1 million primarily due to purchases of marketable securities, net of 
maturities. 

Net cash provided by investing activities for the year ended December 31, 2022 was $90.6 million. This was due to proceeds of $89.2 million from sales 
and maturities of marketable securities, net of purchases, and proceeds of $1.5 million received in 2022 from the sale of Microbiome assets in 2021.

Financing Activities

Net cash provided by financing activities for the year ended December 31, 2023 was $13.8 million resulting from the net proceeds of $9.1 million from the 
sale  of  1,089,472  shares  of  our  common  stock  in  accordance  with  the  Gilead  Equity  Agreements,  $4.5  million  from  the  sale  of  261,170  shares  of  our 
common stock under our "at-the-market" offering program (the 2020 ATM) and $0.1 million from the issuance of 14,453 shares of common stock under the 
Assembly Biosciences Amended and Restated 2018 Employee Stock Purchase Plan (2018 ESPP).

Net cash provided by financing activities for the year ended December 31, 2022 was $0.6 million resulting from the net proceeds of $0.3 million from the 
sale of 25,068 shares of our common stock under the 2020 ATM and $0.3 million from the issuance of 18,819 shares of common stock under the 2018 
ESPP.

46

 
Item 7A. Quantitative and Qualitative Disclosures about Market Risk

Not applicable.

Item 8. Financial Statements and Supplementary Data

(a) Financial Statements

The financial statements required to be filed pursuant to this Item 8 are appended to this report. An index of those financial statements is found 
on page F-1.

(b) Supplementary Data

Not applicable.

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

None.

Item 9A. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We maintain a system of disclosure controls and procedures, as defined in Rule 13a-15(e) promulgated under the Securities and Exchange Act of 1934, as 
amended  (the  Exchange  Act),  that  is  designed  to  provide  reasonable  assurance  that  information,  which  is  required  to  be  disclosed  in  our  reports  filed 
pursuant to the Exchange Act, is accumulated and communicated to management in a timely manner. At the end of fiscal year ending December 31, 2023, 
we carried out an evaluation, under the supervision, and with the participation of, our management, including our Chief Executive Officer and President, 
who serves as our principal executive officer and principal financial officer, of the effectiveness of the design and operation of our disclosure controls and 
procedures pursuant to Exchange Act Rule 13a-15(b). Based upon that evaluation, our Chief Executive Officer and President concluded that our disclosure 
controls and procedures for the fiscal year ending as of December 31, 2023 were effective at reasonable assurance levels.

Management’s Annual Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act 
Rule  13a-15(f).  Our  internal  control  over  financial  reporting  is  designed  to  provide  reasonable  assurance  to  our  management  and  board  of  directors 
regarding the preparation and fair presentation of published financial statements. A control system, no matter how well designed and operated, can only 
provide reasonable, not absolute, assurance that the objectives of the control system are met. Because of these inherent limitations, management does not 
expect  that  our  internal  controls  over  financial  reporting  will  prevent  all  error  and  all  fraud.  Under  the  supervision  and  with  the  participation  of  our 
management,  including  our  Chief  Executive  Officer  and  President,  who  serves  as  our  principal  executive  officer  and  principal  financial  officer,  we 
conducted  an  evaluation  of  the  effectiveness  of  our  internal  control  over  financial  reporting  based  on  the  framework  in  Internal  Control-Integrated 
Framework issued in 2013 by the Committee of Sponsoring Organizations of the Treadway Commission. Based on our evaluation under the framework in 
Internal  Control-Integrated  Framework,  our  management  concluded  that  our  internal  control  over  financial  reporting  was  effective  as  of  December  31, 
2023.

Changes in Internal Control over Financial Reporting

There  were  no  changes  in  our  internal  control  over  financial  reporting  in  the  fourth  quarter  of  2023  that  materially  affected,  or  are  reasonably  likely  to 
materially affect, our internal control over financial reporting.

Item 9B. Other Information

Not applicable.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.

47

 
 
PART III

Item 10.  Directors, Executive Officers and Corporate Governance

Except as set forth below, the information required by this item will be contained in our definitive proxy statement to be filed with the SEC in connection 
with  the  Annual  Meeting  of  Stockholders  (Proxy  Statement)  within  120  days  after  the  conclusion  of  our  fiscal  year  ended  December  31,  2023  and  is 
incorporated in this Annual Report on Form 10-K by reference.

Code of Ethics

Our Board has adopted a Code of Ethics for our principal executive officer and all senior financial officers and a Code of Conduct applicable to all of our 
employees and our directors. Both Codes are available under the “Investors—Corporate Governance” section of our website at www.assemblybio.com. If 
we  make  any  substantive  amendments  to,  or  grant  any  waivers  from,  the  Code  of  Ethics  for  our  principal  executive  officer,  principal  financial  officer, 
principal accounting officer, controller or persons performing similar functions, or any officer or director, we will disclose the nature of such amendment or 
waiver on our website or in a Current Report on Form 8-K.

Item 11.  Executive Compensation

The information required by this item will be contained in the Proxy Statement and is incorporated into this Annual Report on Form 10-K by reference.

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

Except  for  the  table  regarding  equity  compensation  plans,  the  information  required  by  this  item  will  be  contained  in  the  Proxy  Statement  and  is 
incorporated into this Annual Report on Form 10-K by reference.

Securities Authorized for Issuance Under Equity Compensation Plans

The following table sets forth the indicated information as of December 31, 2023 with respect to our equity compensation plans.

Number of
securities
remaining
available for
future
issuance
under equity
compensation
plans
(excluding
securities
reflected in
column (a))
(c)

Weighted
average
exercise
price of
outstanding
options,
warrants
and
rights
(b)

(1)

47.19      

318,868  

Number of
securities
to be issued
upon
exercise of
outstanding
options,
warrants
and rights
(a)

790,667  

(2
)

  $

(4
)

167,426  
958,093    

  $

132.47      

10  
318,878  

(3)

(5)

Plan Category
Equity compensation plans approved by security holders

Equity compensation plans not approved by security holders

Total

(1) The weighted average exercise price is calculated solely based on the exercise prices of the outstanding stock options and does not reflect the shares 

that will be issued upon the vesting of outstanding awards of restricted stock units (RSUs), which have no exercise price.

(2) This number includes the following: 19,863 shares subject to stock options granted under the 2010 Equity Incentive Plan (2010 Plan); 211,244 shares 
subject to outstanding awards granted under the Assembly Biosciences, Inc. Amended and Restated 2014 Stock Incentive Plan (2014 Plan), of which 
209,591 were subject 

48

 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
  
 
     
 
     
     
   
   
 
 
     
 
to outstanding stock options and 1,653 were subject to outstanding RSUs; 520,707 shares subject to outstanding awards granted under the Assembly 
Biosciences, Inc. 2018 Stock Incentive Plan, as amended (2018 Plan), of which 429,157 were subject to outstanding stock options and 91,550 were 
subject to outstanding RSUs; and 38,853 options assumed by us in connection with our merger with Assembly Pharmaceuticals. This number excludes 
purchase rights currently accruing under the Assembly Biosciences, Inc. Amended and Restated 2018 Employee Stock Purchase Plan (2018 ESPP).

(3) This number includes: no shares under the 2010 Plan, which has been frozen; 554 shares available for issuance under the 2014 Plan; 264,627 shares 
available  for  issuance  under  the  2018  Plan;  and  53,687  shares  reserved  for  issuance  under  the  2018  ESPP.  As  of  March  22,  2024,  assuming  each 
participant purchases the maximum number of shares in the current offering period, no more than 12,896 shares are subject to purchase in the current 
offering, which ends on May 14, 2024.

(4) This number includes 65,035 shares subject to stock options granted under the 2017 Inducement Award Plan (2017 Inducement Plan); 41,666 shares 
subject to stock options granted under the 2019 Inducement Award Plan (2019 Inducement Plan); and 60,725 shares subject to outstanding awards 
granted under the 2020 Inducement Award Plan (2020 Inducement Plan), of which 58,746 were subject to outstanding stock options and 1,979 were 
subject to outstanding RSUs.

(5) This  number  includes:  6  shares  available  for  issuance  under  the  2017  Inducement  Plan,  no  shares  under  the  2019  Inducement  Plan  and  4  shares 

available for issuance under the 2020 Inducement Plan.

Our  stockholder-approved  equity  compensation  plans  consist  of  the  2018  Plan,  2014  Plan,  the  2010  Plan,  stock  options  assumed  in  our  merger  with 
Assembly Pharmaceuticals and the 2018 ESPP. Effective on June 2, 2016, the 2010 Plan was frozen, and no further grants will be made under the 2010 
Plan. Shares that are forfeited under the 2010 Plan on or after June 2, 2016 will become available for issuance under the 2014 Plan. An “Award” under the 
2018  Plan,  2014  Plan  or  2010  Plan  is  any  right  to  receive  our  common  stock  consisting  of  non-statutory  stock  options,  incentive  stock  options,  stock 
appreciation rights, RSUs, or any other stock award.

In  May  2018,  our  stockholders  approved  the  2018  ESPP  and  it  was  amended  and  restated  in  May  2021.  The  2018  ESPP  provides  for  the  purchase  by 
employees of up to an aggregate of 108,333 shares of the Company’s common stock. Eligible employees can purchase shares of our common stock at the 
end of a predetermined offering period at 85% of the lower of the fair market value at the beginning or end of the offering period.

Our  outstanding  equity  compensation  arrangements  that  have  not  been  approved  by  our  stockholders  consist  of  the  2017  Inducement  Plan,  the  2019 
Inducement Plan and the 2020 Inducement Plan. In April 2017, our board of directors adopted the 2017 Inducement Plan and reserved 66,666 shares of our 
common  stock  for  issuance  under  the  2017  Inducement  Plan.  In  August  2019,  our  board  of  directors  adopted  the  2019  Inducement  Plan  and  reserved 
41,666 shares of our common stock for issuance under the 2019 Inducement Plan. In March 2020, our board of directors adopted the 2020 Inducement Plan 
and reserved 66,666 shares of our common stock for issuance under the 2020 Inducement Plan. The only persons eligible to receive grants of awards under 
the 2017 Inducement Plan, the 2019 Inducement Plan or the 2020 Inducement Plan are individuals who satisfy the standards for inducement grants under 
Nasdaq Marketplace Rule 5635(c)(4) and the related guidance under Nasdaq IM 5635-1-that is, generally, a person not previously an employee or director 
of ours, or following a bona fide period of non-employment, as an inducement material to the individual's entering into employment with us. An “Award” is 
any right to receive our common stock pursuant to the Inducement Plan, consisting of nonstatutory stock options, stock appreciation rights, restricted stock 
awards, RSUs, or any other stock award.

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

The information required by this item will be contained in the Proxy Statement and is incorporated into this Annual Report on Form 10-K by reference.

Item 14.  Principal Accountant Fees and Services

The information required by this item will be contained in the Proxy Statement and is incorporated into this Annual Report on Form 10-K by reference.

49

 
Item 15.  Exhibits, Financial Statement Schedules

(a) Exhibits.   The following exhibits are filed as part of this Annual Report on Form 10-K:

Exhibit
Number

Description of Document

Registrant’s
Form

Dated

Exhibit
No.

  3.1

  3.2

  3.3
  4.1
  4.2
10.1

  Sixth Amended and Restated Certificate of Incorporation dated May 25, 

2022.

  Certificate of Amendment to Sixth Amended and Restated Certificate of 
Incorporation of Assembly Biosciences, Inc., dated February 9, 2024.
  Amended and Restated Bylaws as amended through December 7, 2022.
  Specimen of Common Stock Certificate.
  Description of Securities.
  Sublease, dated July 26, 2023, by and between Arsenal Biosciences, Inc., 

as Sublandlord, and Assembly Biosciences, Inc., as Subtenant.

8-K

8-K
S-3

02/13/2024

12/12/2022
12/30/2015

10-Q

11/08/2023

10.2‡

  Option, License and Collaboration Agreement, dated October 15, 2023, by 

10.3‡

and between Assembly Biosciences, Inc. and Gilead Sciences, Inc.
  Common Stock Purchase Agreement, dated October 15, 2023, by and 

between Assembly Biosciences, Inc. and Gilead Sciences, Inc.

10.4‡

  Investor Rights Agreement, dated October 15, 2023, by and between 

8-K

8-K

8-K

10/17/2023

10/17/2023

10/17/2023

Assembly Biosciences, Inc. and Gilead Sciences, Inc.

3.1

3.1
4.1

10.1

10.1

10.2

10.3

10.5*

  Exclusive License Agreement dated September 3, 2013 by and between 

10-Q

11/17/2014

10.29

10.6†

10.7†

The Indiana University Research and Technology Corporation and 
Assembly Pharmaceuticals, Inc.

  Amendment No. 1 to Exclusive License Agreement, by and between 
Assembly Biosciences, Inc. and the Indiana University Research and 
Technology Corporation.

  Amendment No. 2 to Exclusive License Agreement, by and between 
Assembly Biosciences, Inc. and the Indiana University Research and 
Technology Corporation.

10-Q

11/05/2020

10.1

10-Q

11/05/2020

10.2

10.8†‡

  Collaboration Agreement, dated as of July 17, 2020, by and between 

10-Q

11/05/2020

Assembly Biosciences, Inc. and BeiGene, Ltd.

10.9#

  Amended and Restated Employment Agreement, dated December 12, 

10-K 

03/22/2023

10.3

10.7

10.10#

2022, between Assembly Biosciences, Inc. and Jason A. Okazaki.
  Employment Agreement, dated May 1, 2020, between Assembly 

Biosciences, Inc. and William E. Delaney IV, Ph.D., effective as of May 
27, 2020.

10.11#

  Employment Agreement, dated November 8, 2023, between Assembly 

Biosciences, Inc. and Anuj Gaggar, M.D., Ph.D.

10.12#

  Employment Agreement, dated February 10, 2022, between Assembly 

Biosciences, Inc. and Nicole S. White, Ph.D., effective as of February 16, 
2022.

10-K

02/25/2021

10.12

10.13#

  2010 Equity Incentive Plan.

S-1/A

10/4/2010

10.14

Filed
Herewith
X

X

X

X

50

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number

Description of Document

10.14#

  Assembly Biosciences, Inc. Amended and Restated 2014 Stock Incentive 

Registrant’s
Form
8-K

Dated

06/06/2016

Exhibit
No.
10.1

Filed
Herewith

Plan.

10.15#

  Omnibus Amendment to Assembly Biosciences, Inc. Stock Incentive 

Plans.

10.16#

  Form of Notice of Stock Option Grant and Stock Option Agreement under 

the Amended and Restated 2014 Stock Incentive Plan.

10.17#

  Form of Restricted Stock Unit Award Notice and Restricted Stock Unit 

Award Agreement under the Amended and Restated 2014 Stock Incentive 
Plan.

10.18#
10.19#

  Assembly Biosciences, Inc. 2017 Inducement Award Plan.
  Form of Notice of Stock Option Grant and Stock Option Agreement under 

the 2017 Inducement Award Plan.

10.20#

  Form of Restricted Stock Unit Award Notice and Restricted Stock Unit 

Award Agreement under the 2017 Inducement Award Plan.

10.21#
10.22#

  Assembly Biosciences, Inc. 2018 Stock Incentive Plan.
  Amendment No. 1 to Assembly Biosciences, Inc. 2018 Stock Incentive 

Plan.

10.23#

  Amendment No. 3 to Assembly Biosciences, Inc. 2018 Stock Incentive 

Plan.

10.24#

  Amendment No. 4 to Assembly Biosciences, Inc. 2018 Stock Incentive 

Plan.

10.25#

  Amendment No. 5 to Assembly Biosciences, Inc. 2018 Stock Incentive 

Plan.

10.26#

  Amendment No. 6 to Assembly Biosciences, Inc. 2018 Stock Incentive 

Plan.

10-Q

10-K

10-Q

10-Q
10-Q

10-Q

8-K
8-K

8-K

8-K

8-K

8-K

05/08/2020

10.2

03/22/2023

10.12

11/01/2017

10.1

08/09/2017
08/09/2017

08/09/2017

06/01/2018
05/21/2019

06/16/2020

05/25/2021

05/27/2022

05/30/2023

10.1
10.2

10.3

10.1
10.2

10.1

10.1

10.1

10.1

10.27#

  Form of Notice of Stock Option Grant and Stock Option Agreement under 

10-K

03/22/2023

10.22

the 2018 Stock Incentive Plan.

10.28#

  Form of Restricted Stock Unit Award Notice and Restricted Stock Unit 

Award Agreement under the 2018 Stock Incentive Plan.

10.29#

  Form of Stock Appreciation Right Award Agreement for Non-U.S. 

8-K

8-K

06/01/2018

10/12/2018

10.3

10.4

10.30#

Grantees under the Assembly Biosciences, Inc. 2018 Stock Incentive Plan.
  Form of Performance-Based Stock Appreciation Right Award Agreement 
for Non-U.S. Grantees under the Assembly Biosciences, Inc. 2018 Stock 
Incentive Plan.

10.31#

  Amended and Restated Assembly Biosciences, Inc. 2018 Employee Stock 

Purchase Plan.

10.32#
10.33#

10.34#
10.35#

  Assembly Biosciences, Inc. 2019 Inducement Award Plan.
  Form of Notice of Stock Option Grant and Stock Option Agreement under 

the 2019 Inducement Award Plan.

  Assembly Biosciences, Inc. 2020 Inducement Award Plan.
  Form of Notice of Stock Option Grant and Stock Option Agreement under 

the 2020 Inducement Award Plan. 

10.36#

  Form of Restricted Stock Unit Award Notice and Restricted Stock Unit 

Award Agreement under the 2020 Inducement Award Plan.

10-K

03/11/2022

10.24

8-K

10-Q
10-Q

10-Q
10-Q

10-Q

05/25/2021

11/07/2019
11/07/2019

05/08/2020
05/08/2020

05/08/2020

10.4

10.4
10.5

10.3
10.4

10.5

1.2

10.37

  Open Market Sale Agreement by and between Assembly Biosciences, Inc. 

S-3

08/28/2020

and Jefferies LLC.

51

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number

10.38#
21.1
23.1
24.1
31.1

32.1**

97.1
101.INS 
101.SCH
101.CAL
101.DEF
101.LAB
101.PRE
104

Description of Document

  Assembly Biosciences, Inc. 2022 Corporate Bonus Plan.
  List of Subsidiaries of Assembly Biosciences, Inc.
  Consent of Independent Registered Public Accounting Firm.
  Power of Attorney (included on signature page).
  Certification of the Chief Executive Officer Pursuant to Section 302 of the 

Sarbanes-Oxley Act of 2002.

  Certification of the Chief Executive Officer Pursuant to 18 U.S.C. Section 
1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 
2002.

  Clawback Policy.
  Inline XBRL Instance Document.
  Inline XBRL Taxonomy Extension Schema Document.
  Inline XBRL Taxonomy Extension Calculation Linkbase Document.
  Inline XBRL Taxonomy Extension Definitions Linkbase Document.
  Inline XBRL Taxonomy Extension Label Linkbase Document.
  Inline XBRL Taxonomy Extension Presentation Linkbase Document.
  Cover Page Interactive Data File (embedded within the Inline XBRL 

document).

Registrant’s
Form
8-K

Dated

02/04/2022

Exhibit
No.
10.1

Filed
Herewith

X
X
X
X

X

X

*  Certain  information  in  this  exhibit  has  been  omitted  and  filed  separately  with  the  Securities  and  Exchange  Commission  pursuant  to  a  confidential 
treatment request.
† The schedules to this exhibit have been omitted pursuant to Item 601(a)(5) of Regulation S-K.
‡ Portions of this exhibit have been omitted pursuant to Item 601(b)(10)(iv) of Regulation S-K.
# Represents management contracts or compensatory plans or arrangements.
** The certification attached as Exhibit 32.1 that accompanies this Annual Report on Form 10-K is to be deemed furnished and shall not be deemed “filed” 
with the SEC and is not to be incorporated by reference into any filing of Assembly Biosciences, Inc. under the Securities Act of 1933, as amended, or the 
Securities  Exchange  Act  of  1934,  as  amended,  whether  made  before  or  after  the  date  of  this  Annual  Report  on  Form  10-K,  irrespective  of  any  general 
incorporation language contained in such filing.

Item 16.  Form 10-K Summary

None.

52

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In accordance with Section 13 or 15(d) of the Securities Exchange Act, the Registrant caused this report to be signed on its behalf by the undersigned, 
thereunto duly authorized.

SIGNATURES

Date: March 28, 2024

ASSEMBLY BIOSCIENCES, INC.

By:
Name:
Title:

/s/ Jason A. Okazaki
Jason A. Okazaki
Chief Executive Officer and President

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints  Jason A. Okazaki and John O. 
Gunderson,  jointly  and  severally,  his  or  her  attorneys-in-fact,  each  with  the  power  of  substitution,  for  him  or  her  in  any  and  all  capacities,  to  sign any 
amendments  to  this  report,  and  to  file  the  same,  with  exhibits  thereto  and  other  documents  in  connection  therewith  with  the  Securities  and  Exchange 
Commission, hereby ratifying and confirming all that each of said attorneys-in-fact, or his or her substitute or substitutes may do or cause to be done by 
virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons on behalf of the registrant in the 
capacities and on the dates indicated.

Signature

/s/ Jason A. Okazaki
Jason A. Okazaki
/s/ Jeanette M. Bjorkquist
Jeanette M. Bjorkquist

/s/ William R. Ringo, Jr.
William R. Ringo, Jr.

/s/ Anthony E. Altig
Anthony E. Altig

/s/ Tomas Cihlar, Ph.D.
Tomas Cihlar, Ph.D.

/s/ Gina Consylman
Gina Consylman

/s/ Robert D. Cook II
Robert D. Cook II

/s/ Sir Michael Houghton, Ph.D.
Sir Michael Houghton, Ph.D.

/s/ Lisa R. Johnson-Pratt, M.D.
Lisa R. Johnson-Pratt, M.D.

/s/ Susan Mahony, Ph.D.
Susan Mahony, Ph.D.

/s/ John G. McHutchison, A.O., M.D.
John G. McHutchison, A.O., M.D.

Title

  Chief Executive Officer, President and Director
  (Principal Executive Officer and Principal Financial Officer)
  Executive Director, Accounting and Treasury
  (Principal Accounting Officer)

  Chairman of the Board

  Director

  Director

  Director

  Director

  Director

  Director

  Director

  Director

53

Date

  March 28, 2024

  March 28, 2024

  March 28, 2024

  March 28, 2024

  March 28, 2024

  March 28, 2024

  March 28, 2024

  March 28, 2024

  March 28, 2024

  March 28, 2024

  March 28, 2024

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
   
   
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
   
   
 
 
 
 
 
   
   
 
 
 
 
 
   
   
 
 
 
 
 
   
   
 
 
 
 
 
   
   
 
 
 
 
 
 
ASSEMBLY BIOSCIENCES, INC.
FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)
Consolidated Balance Sheets as of December 31, 2023 and 2022
Consolidated Statements of Operations and Comprehensive Loss for the Years Ended December 31, 2023 and 2022
Consolidated Statements of Changes in Stockholders’ Equity for the Years Ended December 31, 2023 and 2022
Consolidated Statements of Cash Flows for the Years Ended December 31, 2023 and 2022 
Notes to Consolidated Financial Statements

Page

F-2
F-4
F-5
F-6
F-7
F-8

F-1

 
 
 
 
Report of Independent Registered Public Accounng Firm

To the Stockholders and the Board of Directors of Assembly Biosciences, Inc.

Opinion on the Financial Statements 

We have audited the accompanying consolidated balance sheets of Assembly Biosciences, Inc. (the Company) as of December 31, 2023 and 2022, the related 
consolidated statements of operaons and comprehensive loss, changes in stockholders’ equity and cash flows for each of the two years in the period ended 
December 31, 2023, and the related notes (collecvely referred to as the “consolidated financial statements”). In our opinion, the consolidated financial 
statements present fairly, in all material respects, the financial posion of the Company at December 31, 2023 and 2022, and the results of its operaons and 
its cash flows for each of the two years in the period ended December 31, 2023, in conformity with U.S. generally accepted accounng principles. 

Basis for Opinion

These financial statements are the responsibility of the Company‘s management. Our responsibility is to express an opinion on the Company’s financial 
statements based on our audits. We are a public accounng firm registered with the Public Company Accounng Oversight Board (United States) (PCAOB) and 
are required to be independent with respect to the Company in accordance with the U.S. federal securies laws and the applicable rules and regulaons of 
the Securies and Exchange Commission and the PCAOB. 

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable 
assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor 
were we engaged to perform, an audit of its internal control over financial reporng. As part of our audits we are required to obtain an understanding of 
internal control over financial reporng but not for the purpose of expressing an opinion on the effecveness of the Company's internal control over financial 
reporng. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and 
performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in 
the financial statements. Our audits also included evaluang the accounng principles used and significant esmates made by management, as well as 
evaluang the overall presentaon of the financial statements. We believe that our audits provide a reasonable basis for our opinion. 

Crical Audit Maer 

The crical audit maer communicated below is a maer arising from the current period audit of the financial statements that was communicated or 
required to be communicated to the audit commiee and that: (1) relates to accounts or disclosures that are material to the financial statements and (2) 
involved our especially challenging, subjecve or complex judgments. The communicaon of the crical audit maer does not alter in any way our opinion on 
the consolidated financial statements, taken as a whole, and we are not, by communicang the crical audit maer below, providing a separate opinion on 
the crical audit maer or on the accounts or disclosures to which it relates.

F-2

 
 
Descripon of the 
Maer

  Collaboraon Agreement with Gilead Sciences, Inc. 

  As described in Note 10 to the consolidated financial statements, the Company entered into an Opon, License and Collaboraon 
Agreement (the Gilead Collaboraon Agreement) and Common Stock Purchase Agreement and an Investor Rights Agreement (the 
Gilead Equity Agreements) with Gilead Sciences, Inc. during the year ended December 31, 2023. The Company concluded Gilead is a 
customer and accordingly, the Gilead Collaboraon Agreement is within the scope of the revenue from contracts with customers 
guidance.  In determining the appropriate accounng treatment, the Company idenfied a single combined performance obligaon 
for the discovery, research and development services during the collaboraon term, and will recognize revenue over me using a 
cost-based input method.  The Company determined that the total transacon price under the Gilead Collaboraon Agreement was 
$90.7 million, which consisted of an upfront payment of $84.8 million and a $5.9 million premium on the purchase of the 
Company’s common stock that was allocated to the single combined performance obligaon under the Gilead Collaboraon 
Agreement. 

Auding the Company’s revenue recognion for the Gilead Collaboraon Agreement is complex and required the Company to apply 
significant judgment to determine whether any promises or services described in the Gilead Collaboraon Agreement meet the 
criteria of being disnct and capable of being disnct within the context of the contract or represent a material right. 

How We Addressed the 
Maer in Our Audit

To test the conclusion that the various promises under the contract collecvely constuted a single combined performance 
obligaon, our audit procedures included, among others, reviewing the Gilead Collaboraon Agreement, discussing the potenal 
performance obligaons with management, and evaluang whether management's accounng posion considered all relevant facts 
and terms included in the agreement. We further evaluated management's technical analysis and assessed management's 
conclusions to determine whether they had appropriately considered and applied the guidance and interpretaons associated with 
performance obligaons within the scope of the revenue from contracts with customers guidance.

/s/ Ernst & Young LLP
We have served as the Company’s auditor since 2015.
San Jose, California
March 28, 2024

F-3

 
 
 
 
 
 
 
ASSEMBLY BIOSCIENCES, INC.
CONSOLIDATED BALANCE SHEETS
(In thousands except for share amounts and par value)

ASSETS
Current assets

Cash and cash equivalents
Marketable securities
Accounts receivable from collaboration
Prepaid expenses and other current assets

Total current assets

Property and equipment, net
Operating lease right-of-use (ROU) assets
Other assets

Total assets

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities

Accounts payable
Accrued research and development expenses
Other accrued expenses
Deferred revenue - short-term ($30,915 and $− to a related party)
Operating lease liabilities - short-term

Total current liabilities

Deferred revenue - long-term ($55,379 and $− to a related party)
Operating lease liabilities - long-term

Total liabilities

Commitments and contingencies

Stockholders' equity

December 31,
2023

December 31,
2022

  $

  $

  $

19,841     $
110,406    
43    
3,497    
133,787    

385    
2,339    
312    
136,823     $

461     $
885    
5,744    
30,915    
1,220    
39,225    

55,379    
1,122    
95,726    

52,418  
39,192  
944  
4,413  
96,967  

743  
3,195  
889  
101,794  

2,493  
3,122  
7,317  
—  
3,364  
16,296  

2,733  
101  
19,130  

Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value; 150,000,000 shares authorized as of December 31, 2023 and 
December 31, 2022; 5,482,752 and 4,074,552 shares issued and outstanding as of December 31, 2023 
and December 31, 2022, respectively
Additional paid-in capital
Accumulated other comprehensive loss
Accumulated deficit
Total stockholders' equity

Total liabilities and stockholders' equity

  $

—    

—  

5    
826,921    
(81 )  
(785,748 )  
41,097    
136,823     $

4  
807,983  
(803 )
(724,520 )
82,664  
101,794  

See Accompanying Notes to the Consolidated Financial Statements 

F-4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
  
 
 
   
 
 
 
 
   
 
 
  
 
 
   
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ASSEMBLY BIOSCIENCES, INC. 
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS 
(In thousands except for share and per share amounts)

Collaboration revenue ($4,430 and $− from a related party)

  $

7,163     $

—  

Year Ended December 31,

2023

2022

Operating expenses

Research and development
General and administrative

Total operating expenses
Loss from operations

Other income

Interest and other income, net

Total other income
Loss before income taxes

Income tax expense

Net loss

Other comprehensive loss

Unrealized gain (loss) on marketable securities

Comprehensive loss

Net loss per share, basic and diluted

Weighted average common shares outstanding, basic and diluted

48,900    
22,909    
71,809    
(64,646 )  

3,451    
3,451    
(61,195 )  

(33 )  
(61,228 )   $

722    
(60,506 )   $

(13.38 )   $

4,577,371    

69,980  
24,134  
94,114  
(94,114 )

1,022  
1,022  
(93,092 )

—  
(93,092 )

(384 )
(93,476 )

(23.08 )

4,034,105  

  $

  $

  $

See Accompanying Notes to the Consolidated Financial Statements 

F-5

 
 
 
 
 
 
 
   
 
 
 
     
   
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
     
   
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
     
   
 
     
   
 
 
 
 
 
     
   
 
 
 
 
ASSEMBLY BIOSCIENCES, INC. 
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY 
(In thousands except for share amounts)

Balance as of December 31, 2021
Issuance of common stock under at-the-market (ATM) 
equity offering program, net of issuance costs
Issuance of common stock under Employee Stock 
Purchase Plan (ESPP)
Issuance of common stock for settlement of restricted 
stock units (RSUs)
Unrealized loss on marketable debt securities
Stock-based compensation
Net loss
Balance as of December 31, 2022
Issuance of common stock under ATM equity offering 
program, net of issuance costs
Issuance of common stock under ESPP
Issuance of common stock for settlement of RSUs
Issuance of common stock to a related party, net of 
issuance costs
Unrealized gain on marketable debt securities
Stock-based compensation
Net loss
Balance as of December 31, 2023

Common Stock

Shares
4,010,009  

  $

Amount

Additional
Paid-in
Capital

Accumulated
Other
Comprehensive
Loss

    Accumulated

Deficit

Total
Stockholders'
Equity

4  

  $

800,772     $

(419 )   $

(631,428 )   $

168,929  

25,068  

18,819  

20,656  
—  
—  
—  
4,074,552  

261,170  
14,453  
43,105  

1,089,472  
—  
—  
—  
5,482,752  

  $

  $

—  

—  

—  
—  
—  
—  
4  

—  
—  
—  

1  
—  
—  
—  
5  

  $

  $

325      

289      

—      
—      
6,597      
—      
807,983     $

4,546      
129      
—      

9,142      
—      
5,121      
—      
826,921     $

—      

—      

—      
(384 )    
—      
—      
(803 )   $

—      
—      
—      

—      
722      
—      
—      
(81 )   $

—      

—      

—      
—      
—      
(93,092 )    
(724,520 )   $

—      
—      
—      

—      
—      
—      
(61,228 )    
(785,748 )   $

325  

289  

—  
(384 )
6,597  
(93,092 )
82,664  

4,546  
129  
—  

9,143  
722  
5,121  
(61,228 )
41,097  

See Accompanying Notes to the Consolidated Financial Statements

F-6

 
 
 
 
   
   
   
 
 
 
   
   
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ASSEMBLY BIOSCIENCES, INC. 
CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)

Cash flows from operating activities
Net loss
Adjustments to reconcile net loss to net cash used in operating activities:

Depreciation and amortization
Stock-based compensation
Net (accretion) amortization of investments in marketable debt securities
Non-cash rent expense
Loss on disposal of property and equipment
Changes in operating assets and liabilities:
Accounts receivable from collaboration
Prepaid expenses and other current assets
Other assets
Accounts payable
Accrued research and development expenses
Other accrued expenses
Deferred revenue
Operating lease liabilities

Net cash provided by (used in) operating activities

Cash flows from investing activities

Proceeds from maturities of marketable securities
Proceeds from sale of property and equipment
Purchases of property and equipment
Purchases of marketable securities
Proceeds from sale of marketable securities
Proceeds from the sale of Microbiome assets
Net cash (used in) provided by investing activities

Cash flows from financing activities

Proceeds from the issuance of common stock to a related party, net of issuance costs
Proceeds from the issuance of common stock under ATM equity offering program, net of issuance costs
Proceeds from the issuance of common stock under ESPP

Net cash provided by financing activities

Net (decrease) increase in cash and cash equivalents
Cash and cash equivalents at the beginning of the period
Cash and cash equivalents at the end of the period

Supplemental non-cash investing and financing activities
Operating lease liabilities arising from obtaining ROU assets

  $

  $

See Accompanying Notes to the Consolidated Financial Statements

F-7

Year Ended December 31,
2022
2023

  $

(61,228 )   $

(93,092 )

450    
5,119    
(1,585 )  
3,507    
139    

901    
916    
577    
(2,032 )  
(2,237 )  
(1,571 )  
83,561    
(3,774 )  
22,743    

65,015    
24    
(255 )  
(133,922 )  
—    
—    
(69,138 )  

9,143    
4,546    
129    
13,818    

(32,577 )  
52,418    
19,841     $

498  
6,593  
155  
3,505  
—  

(608 )
1,328  
814  
(166 )
(278 )
458  
—  
(3,670 )
(84,463 )

88,000  
—  
(102 )
(27,583 )
28,825  
1,500  
90,640  

—  
325  
289  
614  

6,791  
45,627  
52,418  

2,442     $

171  

 
 
 
 
 
 
 
   
 
 
     
   
 
     
   
  
 
  
 
  
 
  
 
  
 
 
     
   
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
 
 
 
 
 
     
   
 
     
   
  
 
  
 
  
 
  
 
  
 
  
 
 
 
 
 
 
     
   
 
     
   
  
 
  
 
  
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
     
   
 
ASSEMBLY BIOSCIENCES, INC. 
Notes to Consolidated Financial Statements

Note 1 - Nature of Business

Overview

Assembly  Biosciences,  Inc.  (together  with  its  subsidiaries,  Assembly  or  the  Company),  incorporated  in  Delaware  in  October  2005,  is  a  biotechnology 
company developing innovative therapeutics. The Company's pipeline includes two helicase-primase inhibitors (HPI) targeting recurrent genital herpes, an 
orally  bioavailable  hepatitis  delta  virus  (HDV)  entry  inhibitor,  a  clinical  stage  capsid  assembly  inhibitor  (CAM)  candidate  designed  to  disrupt  the 
replication cycle of hepatitis B virus (HBV) at several key points with the aim of achieving finite treatment and functional cures and research programs 
focused on the discovery of therapeutics to treat devastating viral diseases, including a non-nucleoside polymerase inhibitor (NNPI) targeting transplant-
related herpesviruses and a small molecule interferon-α (IFN-α) receptor (IFNAR) agonist targeting HBV and HDV. The Company operates in one segment 
and is headquartered in South San Francisco, California.

Liquidity

The Company has not derived any revenue from product sales to date and currently has no approved products. Once a product has been developed, it will 
need to be approved for sale by the U.S. Food and Drug Administration (FDA) or an applicable foreign regulatory agency. Since inception, the Company’s 
operations have been financed through the sale of equity securities, the proceeds from the exercise of warrants and stock options, the issuance of debt, and 
upfront payments related to collaboration agreements. The Company has incurred losses from operations since inception and expects to continue to incur 
substantial losses for the next several years as it continues its product development efforts. In October 2023, the Company received $100.0 million upon 
entering into the Option, License and Collaboration Agreement (the Gilead Collaboration Agreement) and the Common Stock Purchase Agreement and an 
Investor Rights Agreement (collectively, the Gilead Equity Agreements) with Gilead Sciences, Inc. (Gilead). Management believes the Company currently 
has sufficient funds to meet its operating requirements for at least the next twelve months following the date these consolidated financial statements are 
issued.

Note 2 - Summary of Significant Accounting Policies and Recent Accounting Pronouncements

Basis of Presentation

These consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) 
and  include  the  accounts  of  the  Company  and  its  wholly  owned  subsidiaries.  All  intercompany  balances  and  transactions  have  been  eliminated  in 
consolidation.

On January 31, 2024, following approval by the Company's stockholders, the Company's board of directors approved the implementation of a reverse stock 
split at a ratio of 1-for-12 shares of the Company's common stock (the Reverse Stock Split). The Reverse Stock Split was effective as of February 9, 2024 
(see Note 15). All share and per share amounts of the Company's common stock presented have been retroactively adjusted to reflect the 1-for-12 Reverse 
Stock Split, including reclassifying an amount equal to the reduction in par value of common stock to additional paid-in capital. 

Use of Estimates

The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that may 
affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported 
amounts of expenses during the reporting period. Actual results could differ from those estimates.

Significant estimates inherent in the preparation of the accompanying consolidated financial statements include estimates for revenue recognition, including 
the  standalone  selling  price  (SSP)  for  the  allocation  of  transaction  price  to  performance  obligations  and  cost-based  inputs,  as  well  as  estimates  of  costs 
incurred but not yet invoiced for research and development accruals.

F-8

 
 
The  Company’s  estimates  could  be  affected  by  external  conditions,  including  those  unique  to  the  Company  and  general  economic  conditions.  It  is 
reasonably possible these external factors could have an effect on the Company’s estimates and could cause actual results to differ materially from those 
estimates and assumptions.

Other Risks and Uncertainties

The Company relies on contract research organizations (CROs), including one located in Ukraine that temporarily shut down operations due to Russia’s 
invasion. Though this CRO has resumed operations and the Company continues to utilize this CRO, the Company has reallocated certain work to other 
global CROs in case the CRO shuts down operations again.

U.S. and global financial markets have experienced volatility and disruption due to other macroeconomic and geopolitical events such as rising inflation, 
rising interest rates to combat inflation, the risk of a recession, the war between Russia and Ukraine and the Israel-Hamas war. The Company cannot predict 
at this time to what extent, if at all, it and its employees, CROs, vendors and/or collaborators could potentially be negatively impacted by these events.

Cash and Cash Equivalents

All highly liquid investments, including money market funds, with original maturities of three months or less at the time of purchase are considered to be 
cash equivalents. All of the Company’s cash equivalents have liquid markets and high credit ratings. The Company maintains its cash in bank deposits and 
other accounts, the balances of which, at times as of and during the years ended December 31, 2023 and 2022, exceeded federally insured limits.

Investments in Marketable Securities

The  Company  invests  its  excess  cash  in  debt  securities  with  high  credit  ratings,  including,  but  not  limited  to,  money  market  funds  classified  as  cash 
equivalents, securities issued by the U.S. government and its agencies, corporate debt securities and commercial paper. The Company has designated its 
investments in marketable securities as available-for-sale and measures these securities at their respective fair values. The Company reviews all available-
for-sale  securities  at  each  period  end  to  determine  if  they  remain  available-for-sale  based  on  their  current  intent  and  ability  to  sell  the  security  if  it  is 
required to do so. Marketable securities are classified as short-term or long-term based on the maturity date and their availability to meet current operating 
requirements. Marketable securities that mature in one year or less from the consolidated balance sheet date are classified as short-term available-for-sale 
securities, while marketable securities with maturities in one year or beyond one year from the consolidated balance sheet date are classified as long-term.

The Company periodically reviews its marketable securities for declines in fair value below the amortized cost basis to determine whether the impairment, 
if  any,  is  due  to  credit-related  or  other  factors.  This  review  includes  the  credit  worthiness  of  the  security  issuers,  the  severity  of  the  unrealized  losses, 
whether the Company has the intent to sell the securities and whether it is more likely than not the Company will be required to sell the securities before the 
recovery  of  the  amortized  cost  basis.  Unrealized  gains  and  losses  on  available-for-sale  securities  are  reported  in  other  comprehensive  loss,  and  as  a 
component of stockholders' equity until their disposition, with the exception of unrealized losses believed to be related to credit losses which are recognized 
as an allowance for credit losses on the consolidated balance sheet with the corresponding charge in other income in the period the impairment occurs. 
Impairment assessments are made at the individual security level each reporting period. The Company elected to exclude accrued interest receivable from 
the amortized cost basis of its available-for-sale debt securities and to not measure an allowance for credit losses for accrued interest receivable. To date, 
there have been no credit-related declines in value or other impairments of the Company’s investments in marketable securities. Realized gains and losses 
from the sale of marketable securities, if any, are calculated using the specific-identification method.

Leases

All of the Company’s leases are operating leases for facilities and equipment. The Company recognizes a lease asset for its right to use the underlying asset 
and a lease liability for the corresponding lease obligation. The Company determines whether an arrangement is or contains a lease at contract inception. 
Operating leases with a duration greater than one year are included in operating lease ROU assets, operating lease liabilities - short-term, and operating 
lease liabilities - long-term in the Company’s consolidated balance sheets. The Company elected 

F-9

 
the short-term lease exception policy, permitting it to not apply the recognition requirements to leases with terms of less than one year (short-term leases) 
for  all  classes  of  assets.  Operating  lease  ROU  assets  and  liabilities  are  recognized  at  the  lease  commencement  date  based  on  the  present  value  of  lease 
payments  over  the  lease  term.  In  determining  the  net  present  value  of  lease  payments,  the  Company  uses  its  incremental  borrowing  rate  based  on  the 
information  available  at  the  lease  commencement  date.  The  incremental  borrowing  rate  represents  the  interest  rate  the  Company  would  incur  at  lease 
commencement to borrow an amount equal to the lease payments on a collateralized basis over the term of a lease. The Company considers a lease term to 
be the noncancelable period that it has the right to use the underlying asset, including any periods where it is reasonably assured the Company will exercise 
the option to extend the contract. Periods covered by an option to extend are included in the lease term if the lessor controls the exercise of that option. 

The operating lease ROU assets also include any lease payments made and exclude lease incentives. Lease expense is recognized on a straight-line basis 
over  the  expected  lease  term.  Variable  lease  expenses  are  recorded  when  incurred.  The  Company  has  elected  not  to  separate  lease  and  non-lease 
components for its leased assets and accounts for all lease and non-lease components of its agreements as a single lease component.

Impairment of Long-Lived Assets

The Company monitors the carrying value of long-lived assets, including ROU operating lease assets, for potential impairment and tests the recoverability 
of such assets whenever events or changes in circumstances indicate the carrying amounts may not be recoverable. If a change in circumstance occurs, the 
Company performs a test of recoverability by comparing the carrying value of the asset or asset group to its undiscounted expected future cash flows. If 
cash flows cannot be separately and independently identified for a single asset, the Company will determine whether impairment has occurred for the group 
of assets for which the Company can identify the projected cash flows. If the carrying values are in excess of undiscounted expected future cash flows, the 
Company measures any impairment by comparing the fair value of the asset or asset group to its carrying value. There was no impairment of long-lived 
assets during the years ended December 31, 2023 and 2022.

Property and Equipment, Net

Property and equipment are stated at cost and consist of lab and office equipment and leasehold improvements. The Company records depreciation under 
the straight-line method over the estimated useful lives of its property and equipment ranging from two to seven years.

Leasehold  improvements  are  amortized  over  the  remaining  terms  of  the  respective  leases  or  the  estimated  useful  life  of  the  leasehold  improvements, 
whichever is less. Maintenance and repair costs are expensed as incurred.

Fair Value Measurements

The Company follows accounting guidance on fair value measurements for financial instruments measured on a recurring basis, as well as for certain assets 
and liabilities that are initially recorded at their estimated fair values. Fair value is defined as the exit price, or the amount that would be received from 
selling  an  asset  or  paid  to  transfer  a  liability  in  an  orderly  transaction  between  market  participants  at  the  measurement  date.  The  Company  uses  the 
following three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs to value its financial instruments:

Level 1: Observable inputs such as unadjusted quoted prices in active markets for identical instruments.

Level 2: Quoted prices for similar instruments that are directly or indirectly observable in the marketplace.

Level  3:  Significant  unobservable  inputs  which  are  supported  by  little  or  no  market  activity  and  that  are  financial  instruments  whose  values  are 
determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of 
fair value requires significant judgment or estimation.

Financial  instruments  measured  at  fair  value  are  classified  in  their  entirety  based  on  the  lowest  level  of  input  that  is  significant  to  the  fair  value 
measurement. The assessment of the significance of a particular input to the fair value measurement in its entirety requires the Company to make judgments 
and  consider  factors  specific  to  the  asset  or  liability.  The  use  of  different  assumptions  and/or  estimation  methodologies  may  have  a  material  effect  on 
estimated  fair  values.  Accordingly,  the  fair  value  estimates  disclosed  or  initial  amounts  recorded  may  not  be  indicative  of  the  amount  the  Company  or 
holders of the instruments could realize in a current market exchange.

F-10

 
The  carrying  amounts  of  cash  equivalents  and  marketable  securities  approximate  their  fair  value  based  upon  quoted  market  prices.  Certain  of  the 
Company’s financial instruments are not measured at fair value on a recurring basis but are recorded at amounts which approximate their fair value due to 
their liquid or short-term nature, such as cash, accounts receivable, accounts payable and accrued expenses.

The following tables present the fair value of the Company’s financial assets measured at fair value on a recurring basis using the above input categories (in 
thousands):

Level 1

Level 2

Level 3

Fair Value

December 31, 2023

Cash equivalents

Money market fund
Total cash equivalents

Short-term marketable securities

U.S. and foreign corporate debt securities
U.S. treasury securities
U.S. and foreign commercial paper
Total short-term marketable securities
Total assets measured at fair value

Cash equivalents

Money market fund
Total cash equivalents

Short-term marketable securities

U.S. and foreign corporate debt securities
U.S. treasury securities
U.S. and foreign commercial paper
Total short-term marketable securities
Total assets measured at fair value

  $

  $

  $

  $

18,982    
18,982    

$

—     $
—      

—     $
—      

—      
—      
—      
—      
—     $

18,982  
18,982  

17,633  
77,018  
15,755  
110,406  
129,388  

17,633      
77,018      
15,755      
110,406      
110,406     $

December 31, 2022

Level 2

Level 3

Fair Value

—     $
—      

18,597      
11,744      
8,851      
39,192      
39,192     $

—     $
—      

—      
—      
—      
—      
—     $

49,676  
49,676  

18,597  
11,744  
8,851  
39,192  
88,868  

—    
—    
—    
—    
18,982    

Level 1

49,676    
49,676    

—    
—    
—    
—    
49,676    

$

$

$

Money  market  funds  are  highly  liquid  and  actively  traded  marketable  securities  that  generally  transact  at  a  stable  $1.00  net  asset  value  representing  its 
estimated fair value. The Company estimates the fair value of its U.S. and foreign corporate debt securities, U.S. treasury securities and U.S. and foreign 
commercial paper by taking into consideration valuations obtained from third-party pricing services. The pricing services utilize industry standard valuation 
models, including both income and market-based approaches, for which all significant inputs are observable, either directly or indirectly, to estimate fair 
value.  These  inputs  include  reported  trades  of  and  broker/dealer  quotes  on  the  same  or  similar  securities,  issuer  credit  spreads;  benchmark  securities;
prepayment/default projections based on historical data; and other observable inputs.

There  have  been  no  transfers  between  Level  1,  Level  2  or  Level  3  for  any  of  the  periods  presented.  See  Note  4  for  further  information  regarding  the 
carrying value of the Company’s investments in marketable securities.

Revenue Recognition and Accounts Receivable from Collaboration

The Company analyzes its collaboration arrangements to assess whether such arrangements, or transactions between arrangement participants, involve joint 
operating activities performed by parties that are both active participants in the activities and exposed to significant risks and rewards dependent on the 
commercial success of such activities or are more akin to a vendor-customer relationship. In making this evaluation, the Company considers whether the 
activities of the collaboration are considered to be distinct and deemed to be within the scope of the collaborative arrangement accounting standard and 
those that are more reflective of a vendor-customer relationship and, therefore, within the scope of the revenue with contracts with customers accounting 
standard. This assessment is performed throughout the life of the arrangement based on changes in the responsibilities of all parties in the arrangement.

For  elements  of  collaboration  arrangements  that  are  not  accounted  for  pursuant  to  the  revenue  from  contracts  with  customers  accounting  standard,  an 
appropriate  recognition  method  is  determined  and  applied  consistently,  generally  by  analogy  to  the  revenue  from  contracts  with  customers  accounting 
standard. Amounts related to transactions with a 

F-11

 
 
 
 
 
 
 
   
   
   
 
   
   
 
     
     
 
   
 
 
     
     
     
   
   
 
   
 
   
 
   
 
 
 
 
 
 
 
   
   
   
 
   
   
 
     
     
 
   
 
 
     
     
     
   
   
 
   
 
   
 
   
 
counterparty  in  a  collaborative  arrangement  that  is  not  a  customer  are  presented  on  a  separate  line  item  from  revenue  recognized  from  contracts  with 
customers, if any, in the Company’s consolidated statements of operations and comprehensive loss.

Under certain collaborative arrangements, the Company has been reimbursed for a portion of its research and development expenses or participates in the 
cost-sharing of such research and development expenses. Such reimbursements and cost-sharing arrangements are reflected as a reduction of research and 
development expense in the Company’s consolidated statements of operations and comprehensive loss.

For arrangements or transactions between arrangement participants determined to be within the scope of the contracts with customers accounting standard, 
the Company evaluates the term of the arrangement and recognizes revenue when the customer obtains control of promised goods or services in a contract 
for an amount that reflects the consideration the Company expects to receive in exchange for those goods or services. For contracts with customers, the 
Company applies the following five-step model in order to determine this amount: (1) identification of the promised goods or services in the contract; (2) 
determination of whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract; (3) 
measurement  of  the  transaction  price,  including  the  constraint  on  variable  consideration;  (4)  allocation  of  the  transaction  price  to  the  performance 
obligations; and (5) recognition of revenue when (or as) the Company satisfies each performance obligation. 

The  Company  has  provided  standard  indemnification  and  protection  of  licensed  intellectual  property  for  its  customers.  These  provisions  are  part  of 
assurance the licenses meet the agreements, representations and are not obligations to provide goods or services.

The Company only applies the five-step model to contracts when it is probable the Company will collect the consideration it is entitled to in exchange for 
the  goods  or  services  it  transfers  to  the  customer.  As  part  of  the  accounting  for  contracts  with  customers,  the  Company  must  develop  assumptions  that 
require judgment to determine the estimated relative SSP of each performance obligation identified in the contract. The Company then allocates the total 
transaction price to each performance obligation based on the SSP of each performance obligation. The Company recognizes the amount of the transaction 
price that is allocated to the respective performance obligation when the performance obligation is satisfied or as it is satisfied as revenue. 

Licenses 

If a license to the Company’s intellectual property is determined to be distinct from the other performance obligations identified in the arrangement, the 
Company recognizes revenues from nonrefundable, upfront license fees based on the relative value prescribed to the license compared to the total value of 
the  arrangement.  The  revenue  is  recognized  when  the  license  is  transferred  to  the  collaborator  and  the  collaborator  is  able  to  use  and  benefit  from  the 
license. For licenses that are not distinct from other obligations identified in the arrangement, the Company utilizes judgment to assess the nature of the 
combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time. If the combined 
performance obligation is satisfied over time, the Company applies an appropriate method of measuring progress for purposes of recognizing revenue from 
nonrefundable,  upfront  license  fees.  The  Company  evaluates  the  measure  of  progress  each  reporting  period  and,  if  necessary,  adjusts  the  measure  of 
performance and related revenue recognition.

Research and Development Services

The  promises  under  the  Company’s  agreements  may  include  research  and  development  services  to  be  performed  by  the  Company  on  behalf  of  the 
counterparty. If these services are determined to be distinct from the other promises or performance obligations identified in the arrangement, the Company 
recognizes the transaction price allocated to these services as revenue over time based on an appropriate measure of progress when the performance by the 
Company does not create an asset with an alternative use and the Company either has received or has an enforceable right to payment for the performance 
completed to date. If these services are determined not to be distinct from the other promises or performance obligations identified in the arrangement, the 
Company recognizes the transaction price allocated to the combined performance obligation as the related performance obligations are satisfied.

Customer Options

If an arrangement contains customer options, the Company evaluates whether the options are material rights because they allow the customer to acquire 
additional goods or services for free or at a discount. If the customer options are determined to represent a material right, the material right is recognized as 
a separate performance obligation at the outset of the arrangement. The identification of a material right, and if identified as a material right, the allocation 
of the transaction price to it, is based on the SSP, which is determined using assumptions regarding estimated costs, 

F-12

 
discount  rates,  post-option  development  timeline,  the  probability  of  technical  and  regulatory  success  and  the  probability  the  customer  will  exercise  the 
option. Amounts allocated to a material right are not recognized as revenue until, at the earliest, the option is exercised or expires. If the options are deemed 
not to be a material right, they are considered marketing offers which are excluded as performance obligations at the outset of the arrangement.

Development and Regulatory Milestone Payments

Depending on facts and circumstances, the Company may record revenues from certain milestones in a reporting period before the milestone is achieved if 
the Company concludes achievement of the milestone is probable and recognition of revenue related to the milestone will not result in a significant reversal 
in amounts recognized in future periods. The Company records a corresponding contract asset when this conclusion is reached. Milestone payments that 
have not been included in the transaction price to date are fully constrained. The Company re-evaluates the probability of achievement of such milestones 
and any related constraint each reporting period. The Company adjusts its estimate of the overall transaction price, including the amount of collaborative 
revenue that was recorded, if necessary.  

Sales-based Milestone and Royalty Payments

The Company’s customers may be required to pay the Company sales-based milestone payments or royalties on future sales of commercial products. The 
Company  recognizes  revenues  related  to  sales-based  milestone  and  royalty  payments  upon  the  later  to  occur  of  (i)  achievement  of  the  collaborator’s 
underlying  sales  or  (ii)  satisfaction  of  any  performance  obligation(s)  related  to  these  sales,  in  each  case  assuming  the  Company’s  licensed  intellectual 
property is deemed to be the predominant item to which the sales-based milestones and/or royalties relate.

The  Company  receives  payments  from  its  customers  based  on  billing  schedules  established  in  the  contract.  Upfront  payments  and  fees  are  recorded  as 
deferred  revenue  upon  receipt  or  when  due  until  the  Company  performs  its  obligations  under  the  arrangement.  If  the  related  performance  obligation  is 
expected  to  be  satisfied  within  the  next  twelve  months,  these  amounts  will  be  classified  in  current  liabilities.  The  Company  recognizes  a  contract  asset 
relating to its conditional right to consideration that is not subject to a constraint. Amounts are recorded as accounts receivable when the Company’s right to 
consideration is unconditional.  

A net contract asset or liability is presented for each contract with a customer. The Company does not assess whether a contract has a significant financing 
component  if  the  expectation  at  contract  inception  is  such  that  the  period  between  payment  by  the  customer  and  the  transfer  of  the  promised  goods  or 
services to the customer will be one year or less.

At December 31, 2023 and 2022, all accounts receivable from collaboration are deemed collectible. 

Contract Liabilities

The following tables present changes in the Company’s contract liabilities (in thousands):

Year Ended December 31, 2023

Contract liabilities:
Deferred revenue

Year Ended December 31, 2022

Contract liabilities:
Deferred revenue

Balance at
Beginning
of Period

Additions

Deductions

Balance at
End of
Period

 $

2,733  

 $

90,724  

 $

(7,163 )

  $

86,294  

Balance at
Beginning
of Period

Additions

Deductions

Balance at
End of
Period

 $

2,733  

 $

—  

 $

—  

  $

2,733  

F-13

 
 
 
 
 
 
   
   
   
 
 
 
   
     
     
   
 
 
   
     
     
   
 
 
 
   
     
     
   
 
 
 
 
 
 
   
   
   
 
 
 
   
     
     
   
 
 
   
     
     
   
 
 
 
Collaboration revenue recognized in the period from
Amounts included in deferred revenue at the beginning of the period
Performance obligations satisfied in previous period

Stock-Based Compensation

Year Ended December 31,

2023

2022

  $
  $

2,733     $
—     $

—  
—  

The Company measures stock-based compensation to employees, consultants, board members, and non-employees at fair value on the grant date of the 
award. The fair value of RSUs is determined based on the number of shares granted and the quoted market price of the Company’s common stock on the 
date  of  grant.  If  stock-based  awards  are  granted  in  contemplation  of  or  shortly  before  a  planned  release  of  material  nonpublic  information,  and  such 
information  is  expected  to  result  in  a  material  increase  in  the  Company’s  share  price,  the  Company  considers  whether  an  adjustment  to  the  observable 
market price is required when estimating fair values. Compensation cost is recognized as expense on a straight-line basis over the requisite service period of 
the  award.  Stock-based  awards  with  graded  vesting  schedules  are  recognized  using  the  accelerated  attribution  method  on  a  straight-line  basis  over  the 
requisite service period for each separately vesting portion of the award. For awards that have a performance condition, compensation cost is measured 
based on the fair value of the award on the grant date, the date performance targets are established, and is expensed over the requisite service period for 
each  separately  vesting  tranche  when  achievement  of  the  performance  condition  becomes  probable.  The  Company  assesses  the  probability  of  the 
performance conditions being met on a continuous basis. For awards that have a market condition, compensation cost is measured based on the grant-date 
fair  value  of  the  award  and  is  expensed  over  the  derived  service  period  regardless  of  whether  the  underlying  market  condition  is  met.  Forfeitures  are 
recognized when they occur.

The Company estimates the fair value of stock option grants that do not contain market-based vesting conditions using the Black-Scholes option pricing 
model. The assumptions used in estimating the fair value of these awards, such as expected term, expected dividend yield, volatility and risk-free interest 
rate,  represent  management’s  best  estimates  and  involve  inherent  uncertainties  and  the  application  of  management’s  judgment.  The  Company  uses  the 
Monte-Carlo  model  to  calculate  the  fair  value  on  the  date  of  grant  of  awards  which  contain  market-based  vesting  conditions.  This  pricing  model  uses 
multiple simulations to evaluate the probability of achieving the market condition to calculate the fair value of the awards, which includes the recent market 
price and volatility of the Company's shares. The Company is also required to make estimates as to the probability of achieving the specific performance 
conditions.  If  actual  results  are  not  consistent  with  the  Company’s  assumptions  and  judgments  used  in  making  these  estimates,  the  Company  may  be 
required to increase or decrease compensation expense, which could be material to the Company’s consolidated results of operations. 

Research and Development Expense and Accruals

Research  and  development  costs  include  personnel-related  costs,  outside  contracted  services  including  clinical  study  costs,  facilities  costs,  fees  paid  to 
consultants,  milestone  payments  prior  to  FDA  approval,  license  fees  prior  to  FDA  approval,  professional  services,  travel  costs,  dues  and  subscriptions, 
depreciation and materials used in clinical trials and research and development and costs incurred under the Company’s collaboration agreements. Research 
and development costs are expensed as incurred unless there is an alternative future use in other research and development projects. Payments made prior to 
the  receipt  of  goods  or  services  to  be  used  in  research  and  development  are  capitalized  until  the  goods  or  services  are  received.  Such  payments  are 
evaluated for current or long-term classification based on when they will be realized or consumed.

The  Company  records  expenses  related  to  clinical  studies  and  manufacturing  development  activities  based  on  its  estimates  of  the  services  received  and 
efforts expended pursuant to contracts with multiple CROs and manufacturing vendors that conduct and manage these activities on its behalf. The financial 
terms of these agreements are subject to negotiation, vary from contract to contract, and may result in uneven payment flows. There may be instances in 
which payments made to the Company’s vendors will exceed the level of services provided and result in a prepayment of the expense. Payments under 
some of these contracts depend on factors such as the successful enrollment of subjects and the completion of clinical study milestones. In amortizing or 
accruing service fees, the Company estimates the time period over which services will be performed, enrollment of subjects, number of sites activated and 
the level of effort expended in each period. If the actual timing of the performance of services or the level of effort varies from the Company’s estimate, the 
Company will adjust the accrued or prepaid expense balance accordingly. To date, there have been no material differences from the Company’s estimates to 
the amounts actually incurred.

F-14

 
 
 
 
 
 
 
   
 
 
 
   
 
 
The Company has entered and may continue to enter into license agreements to access and utilize certain technology. In each case, the Company evaluates 
if the license agreement results in the acquisition of an asset or a business. To date, none of the Company’s license agreements have been considered to be 
acquisitions of businesses. For asset acquisitions, the upfront payments to acquire such licenses, as well as any future milestone payments, are immediately 
recognized as research and development expense when paid, provided there is no alternative future use of the rights in other research and development 
projects. These license agreements may also include contingent consideration in the form of cash payments to be made for future milestone events. The 
Company assesses whether such contingent consideration meets the definition of a derivative and to date the Company has determined that such contingent 
consideration are not derivatives.

Restructuring Charges 

The Company recognizes restructuring charges related to reorganization plans that have been committed to by management and when liabilities have been 
incurred.  In  connection  with  these  activities,  the  Company  records  restructuring  charges  at  fair  value  for  (1)  contractual  employee  termination  benefits 
when obligations are associated to services already rendered, rights to such benefits have vested, and payment of benefits is probable and can be reasonably 
estimated, (2) one-time employee termination benefits when management has committed to a plan of termination, the plan identifies the employees and 
their  expected  termination  dates,  the  details  of  termination  benefits  are  complete,  it  is  unlikely  changes  to  the  plan  will  be  made  or  the  plan  will  be 
withdrawn and communication to such employees has occurred, and (3) contract termination costs when a contract is terminated before the end of its term. 

One-time employee termination benefits are recognized in their entirety when communication has occurred, and future services are not required. If future 
services  are  required,  the  costs  are  recorded  ratably  over  the  remaining  period  of  service.  Contract  termination  costs  to  be  incurred  over  the  remaining 
contract term without economic benefit are recorded in their entirety when the contract is canceled.

The recognition of restructuring charges requires the Company to make certain judgments and estimates regarding the nature, timing and amount of costs 
associated with the reorganization plan. To the extent the Company’s actual results differ from its estimates and assumptions, the Company may be required 
to revise the estimates of future accrued restructuring liabilities, requiring the recognition of additional restructuring charges or the reduction of accrued 
restructuring  liabilities  already  recognized.  Such  changes  to  previously  estimated  amounts  may  be  material  to  the  consolidated  financial  statements. 
Changes in the estimates of the restructuring charges are recorded in the period the change is determined. There were no restructuring charges incurred 
during the year ended December 31, 2023. Changes to previous estimates for restructuring charges were not material during the year ended December 31, 
2022.

At the end of each reporting period, the Company evaluates the remaining accrued restructuring balances to ensure that no excess accruals are retained, and 
the utilization of the provisions are for their intended purpose in accordance with developed restructuring plans.

Variable Interest Entities

The  Company  reviews  agreements  it  enters  into  with  third  party  entities,  pursuant  to  which  it  may  have  a  variable  interest  in  the  entity,  in  order  to 
determine if the entity is a variable interest entity (VIE). If the entity is a VIE, the Company assesses whether or not it is the primary beneficiary of that 
entity. In determining whether the Company is the primary beneficiary of an entity, the Company applies a qualitative approach that determines whether it 
has both (1) the power to direct the economically significant activities of the entity and (2) the obligation to absorb losses of, or the right to receive benefits 
from, the entity that could potentially be significant to that entity. If the Company were to determine it is the primary beneficiary of a VIE, the Company 
would consolidate the statements of operations and financial condition of the VIE into its consolidated financial statements.

The  Company’s  determination  about  whether  it  should  consolidate  such  VIEs  is  made  continuously  as  changes  to  existing  relationships  or  future 
transactions may result in a consolidation event.

F-15

 
Income Taxes

The Company records income taxes using the asset and liability method. Deferred income tax assets and liabilities are recognized for the future tax effects 
attributable  to  temporary  differences  between  the  financial  statement  carrying  amounts  of  existing  assets  and  liabilities  and  their  respective  income  tax 
bases, and operating loss and tax credit carryforwards. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the 
period  that  includes  the  enactment  date.  The  Company  establishes  a  valuation  allowance  if  it  is  more  likely  than  not  the  deferred  tax  assets  will  not  be 
realized based on an evaluation of objective verifiable evidence. For tax positions that are more likely than not of being sustained upon audit, the Company 
recognizes the largest amount of the benefit that is greater than 50% likely of being realized. For tax positions that are not more likely than not of being 
sustained upon audit, the Company does not recognize any portion of the benefit.

The Company recognizes and measures uncertain tax positions using a two-step approach set forth in authoritative guidance. The first step is to evaluate the 
tax position taken or expected to be taken by determining whether the weight of available evidence indicates it is more likely than not the tax position will 
be  sustained  in  an  audit,  including  resolution  of  any  related  appeals  or  litigation  processes.  The  second  step  is  to  measure  the  tax  benefit  as  the  largest 
amount  that  is  more  than  50%  likely  to  be  realized  upon  ultimate  settlement.  Significant  judgment  is  required  to  evaluate  uncertain  tax  positions.  The 
Company  evaluates  uncertain  tax  positions  on  a  regular  basis.  The  evaluations  are  based  on  a  number  of  factors,  including  changes  in  facts  and 
circumstances, changes in tax law, correspondence with tax authorities during the course of the audit, and effective settlement of audit issues. The provision 
for  income  taxes  includes  the  effects  of  any  accruals  which  the  Company  believes  are  appropriate.  It  is  the  Company’s  policy  to  recognize  interest  and 
penalties related to income tax matters in income tax expense. No interest or penalties related to uncertain tax positions has been incurred or accrued for 
any periods presented.

Pursuant  to  Section  174  of  the  Internal  Revenue  Code  (Sec.  174),  expenses  associated  with  research  conducted  in  the  United  States  are  capitalized  and 
amortized over a five-year period. For expenses associated with research outside of the United States, Sec. 174 expenses are capitalized and amortized over 
a 15-year period. 

Net Loss per Share

Basic net loss per common share excludes dilution and is computed by dividing net loss by the weighted average number of common shares outstanding 
during the period. Diluted net loss per common share reflects the potential dilution that could occur if securities or other contracts to issue common stock 
were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity unless inclusion 
of such shares would be anti-dilutive. Diluted net loss per share is the same as basic net loss per share, since the effects of potentially dilutive securities are 
antidilutive given the net loss for each period presented.

A  reconciliation  of  the  numerators  and  the  denominators  of  the  basic  and  diluted  net  loss  per  common  share  computations  is  as  follows  (in  thousands, 
except for share and per share amounts):

Numerator:
Net loss

Denominator:

Weighted average common shares and
   pre-funded warrants outstanding - basic and diluted

Net loss per share - basic and diluted

Year Ended December 31,

2023

2022

(61,228 ) 

$

(93,092 )

4,577,371   
(13.38 )  

$

4,034,105  

(23.08 )

 $

  
  $

Securities excluded from the computation of diluted net loss per share because including them would have been antidilutive are as follows:

Options to purchase common stock
Common stock subject to purchase under ESPP
Unvested RSUs
Total

F-16

December 31,

2023

2022

862,911    
13,730    
95,182    
971,823    

757,418  
5,971  
141,544  
904,933  

 
 
 
 
 
 
   
 
 
     
   
 
     
   
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Comprehensive Loss

Comprehensive loss is comprised of net loss and adjustments for the change in unrealized gains and losses on investments in available-for-sale marketable
securities. The Company displays comprehensive loss and its components in the consolidated statements of operations and comprehensive loss, net of tax 
effects if any.

Concentrations of Risk

Credit Risk

Financial  instruments  which  potentially  subject  the  Company  to  credit  risk  consist  primarily  of  cash,  cash  equivalents  and  marketable  securities.  The 
Company holds these investments in highly rated financial institutions, and, by policy, limits the amounts of credit exposure to any one financial institution. 
These amounts at times may exceed federally insured limits. The Company has not experienced any credit losses in such accounts and does not believe it is 
exposed  to  any  significant  credit  risk  on  these  funds.  The  Company  has  no  off-balance  sheet  concentrations  of  credit  risk,  such  as  foreign  currency 
exchange contracts, option contracts or other hedging arrangements.

Supplier Risk

Certain materials and key components the Company utilizes in its operations are obtained through single suppliers. Since the suppliers of key components 
and materials must be named in a New Drug Application (NDA) filed with the FDA for a product, significant delays can occur if the qualification of a new 
supplier is required. If delivery of material from the Company’s suppliers were interrupted for any reason, the Company may be unable to supply any of its 
product candidates for clinical trials. 

Customer Risk

During the year ended December 31, 2023, 62% of the Company's collaboration revenue was recognized from a related party, Gilead, under the Gilead 
Collaboration Agreement (see Note 10). If the collaboration with Gilead does not result in the successful development and commercialization of products 
or if Gilead terminates the Gilead Collaboration Agreement, the Company may not receive any future payments under the collaboration.

Recently Adopted Accounting Standards

In  June  2016,  the  Financial  Accounting  Standards  Board  (the  FASB)  issued  Accounting  Standards  Update  (ASU)  No.  2016-13,  Instruments  –  Credit 
Losses: Measurement of Credit Losses on Financial Instruments (ASU 2016-13), which requires expected credit losses relating to financial assets measured 
on an amortized cost basis and available-for-sale debt securities be recorded through an allowance for credit losses. ASU 2016-13 limits the amount of 
credit losses to be recognized for available-for-sale debt securities to the amount by which carrying value exceeds fair value and requires the reversal of 
previously  recognized  credit  losses  if  fair  value  increases.  The  FASB  issued  additional  amendments  to  the  new  guidance  related  to  transition  and 
clarification  and  deferred  the  effective  date  of  this  standard  for  all  entities  except  SEC  filers  that  are  not  smaller  reporting  companies  to  fiscal  years 
beginning after December 15, 2022, including interim periods within those fiscal years. The Company adopted ASU 2016-13 effective January 1, 2023 on a 
modified retrospective basis. The adoption of ASU 2016-13 did not have a material impact on the Company’s consolidated financial statements.

Accounting Pronouncements to Be Adopted

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which is intended 
to provide enhanced segment disclosures. The standard will require disclosures about significant segment expenses and other segment items and identifying 
the Chief Operating Decision Maker and how they use the reported segment profitability measures to assess segment performance and allocate resources. 
These enhanced disclosures are required for all entities on an interim and annual basis, even if they have only a single reportable segment. The standard is 
effective for years beginning after December 15, 2023, and interim periods within annual periods beginning after December 15, 2024, with early adoption 
permitted. The Company is evaluating this standard to determine the impact on the Company’s consolidated financial statements.

In  December  2023,  the  FASB  issued  ASU  2023-09,  Income  Taxes  (Topic  740):  Improvements  to  Income  Tax  Disclosures. The  update  requires  a  public 
business entity to disclose, on an annual basis, a tabular rate reconciliation 

F-17

 
 
using  both  percentages  and  currency  amounts,  broken  out  into  specified  categories  with  certain  reconciling  items  further  broken  out  by  nature  and 
jurisdiction to the extent those items exceed a specified threshold. In addition, all entities are required to disclose income taxes paid, net of refunds received 
disaggregated by federal, state/local, and foreign and by jurisdiction if the amount is at least 5% of total income tax payments, net of refunds received. 
Adoption of the ASU allows for either the prospective or retrospective application of the amendment and is effective for annual periods beginning after 
December 15, 2024, with early adoption permitted. The Company does not expect ASU 2023-09 to have a material impact on the Company’s consolidated 
financial statements.

Note 3 - Related Party

In October 2023, Gilead purchased 1,089,472 shares of the Company’s common stock at a purchase price of $13.92 per share for total proceeds of $15.2 
million under the Gilead Equity Agreements (see Note 8). As of December 31, 2023, Gilead held 19.9% of the Company's outstanding voting common 
stock.  In  addition  to  the  Gilead  Equity  Agreements,  the  Company  entered  into  the  Gilead  Collaboration  Agreement  pursuant  to  which  the  Company 
received  total  proceeds  of  $84.8  million  as  an  upfront  payment  (see  Note  10).  The  Company  recognized  revenue  of  $4.4  million  under  the  Gilead 
Collaboration Agreement during the year ended December 31, 2023.

Additionally,  Gilead  may,  at  the  Company’s  or  Gilead's  option,  subject  to  certain  conditions,  purchase  additional  shares  to  increase  its  holdings  up  to  a 
maximum of 29.9% of the Company's then-outstanding voting common stock. Under the Investor Rights Agreement, Gilead has the right to designate two 
directors to the Company's board of directors. The Company appointed each of Gilead's designees to its board of directors in December 2023 and February 
2024.

Note 4 - Investments in Marketable Securities

Investments in marketable available-for-sale securities consisted of the following (in thousands):

Cash equivalents

Money market fund
Total cash equivalents
Short-term marketable securities

U.S. and foreign corporate debt securities
U.S. treasury securities
U.S. and foreign commercial paper
Total short-term marketable securities
Total cash equivalents and marketable securities

Cash equivalents

Money market fund
Total cash equivalents
Short-term marketable securities

U.S. and foreign corporate debt securities
U.S. treasury securities
U.S. and foreign commercial paper
Total short-term marketable securities
Total cash equivalents and marketable securities

Amortized
Cost

December 31, 2023

Gross
Unrealized
Gain

Gross
Unrealized
Loss

Fair Value

18,982     $
18,982      

17,595      
76,891      
15,728      
110,214      
129,196     $

—     $
—      

41      
127      
27      
195      
195     $

—     $
—      

(3 )    
—      
—      
(3 )    
(3 )   $

18,982  
18,982  

17,633  
77,018  
15,755  
110,406  
129,388  

Amortized
Cost

December 31, 2022

Gross
Unrealized
Gain

Gross
Unrealized
Loss

Fair Value

49,676     $
49,676  

18,903      
11,968      
8,851      
39,722      
89,398     $

—     $
—      

—      
—      
—      
—      
—     $

—     $
—      

(306 )    
(224 )    
—      
(530 )    
(530 )   $

49,676  
49,676  

18,597  
11,744  
8,851  
39,192  
88,868  

  $

  $

  $

  $

Short-term marketable securities held as of December 31, 2023 and 2022 had contractual maturities of less than one year. 

F-18

 
 
 
 
 
 
 
 
   
 
 
   
 
 
   
 
   
     
     
     
 
   
 
     
     
     
   
   
   
   
   
 
 
 
 
 
 
 
   
 
 
   
 
 
   
 
   
     
     
     
 
   
   
 
     
     
     
   
   
   
   
   
 
There were no realized gains and losses for the years ended December 31, 2023 and 2022. As of December 31, 2023 and 2022, investments which were in 
an  unrealized  loss  position  were  not  material  and  generally  due  to  interest  rate  fluctuations,  as  opposed  to  declines  in  credit  quality.  The  Company 
determined it has the intent and ability to hold all marketable securities that have been in a continuous loss position until recovery of their amortized cost 
basis, which may be until maturity. As a result, the Company did not recognize any credit losses related to its investments and all unrealized gains and 
losses  on  available-for-sale  securities  are  recorded  in  accumulated  other  comprehensive  loss  on  the  consolidated  balance  sheets  during  the  years  ended 
December 31, 2023 and 2022. 

Accrued interest receivable was $0.3 million  as  of  December  31,  2023  and  2022  and  was  recorded  in  prepaid  expenses  and  other  current  assets  on  the 
consolidated balance sheets. The Company did not write off any accrued interest receivable during the years ended December 31, 2023 and 2022.

See Note 2 for further information regarding the fair value of the Company's investments in marketable securities.

Note 5 - Property and Equipment, Net

Property and equipment, net consists of the following (in thousands):

Lab equipment
Office equipment
Leasehold improvement
Total property and equipment
Less: Accumulated depreciation
Property and equipment, net

December 31,

2023

2022

295     $
238    
62    
595    
(210 )  
385     $

102  
699  
1,629  
2,430  
(1,687 )
743  

  $

  $

Depreciation expense for both the years ended December 31, 2023 and 2022 was $0.5 million and was recorded in both research and development expense 
and general and administrative expense in the consolidated statements of operations and comprehensive loss. 

Note 6 – Other Accrued Expenses 

Other accrued expenses consist of the following (in thousands): 

Accrued expenses:

Accrued compensation
Accrued restructuring charges
Accrued professional fees and other

Total accrued expenses

Note 7 – Restructurings

December 31,

2023

2022

  $

  $

5,484     $
—    
260    
5,744     $

6,228  
599  
490  
7,317  

In July 2022, the Company and its board of directors approved a strategic plan to align with its refocused pipeline on its next generation capsid assembly 
modulators (CAMs) and research programs and reduced its workforce by approximately 30%. The Company incurred cumulative restructuring charges of 
$1.1 million representing all costs to be incurred. These restructuring charges consisted solely of employee severance and related benefits, including $1.0 
million  in  severance  payments  to  executive  officers  impacted  by  the  restructuring,  $0.8  million  in  one-time  termination  severance  payments  and  other 
employee-related costs associated with the restructuring and a reversal of $0.7 million for previously recognized stock-based compensation expense related 
to  forfeited  awards  based  on  the  Company's  policy  of  recognizing  stock-based  awards  with  graded  vesting  schedules  using  an  accelerated  attribution 
method on a straight-line basis over the requisite service period for each separately vesting portion of the award and to recognize forfeitures when they 
occur.

F-19

 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
     
   
 
 
 
 
 
 
 
There were no restructuring charges incurred during the year ended December 31, 2023. The Company incurred $1.1 million in restructuring charges during 
the  year  ended  December  31,  2022,  $0.9  million  of  which  were  included  in  research  and  development  expenses  and  $0.2  million  in  general  and 
administrative expenses.  

The  following  table  presents  the  activity  in  accrued  restructuring  charges,  included  as  a  component  of  other  accrued  expenses  on  the  Company's 
consolidated balance sheet, during the period (in thousands):

Accrued balance as of December 31, 2021

Costs incurred
Reductions for cash payments

Accrued balance as of December 31, 2022

Reductions for cash payments

Accrued balance as of December 31, 2023

Note 8 - Stockholders’ Equity

  $

$

$

—  
1,879  
(1,280 )
599  
(599 )
—  

The Company is authorized to issue 5,000,000 shares of preferred stock as of December 31, 2023 and 2022. As of December 31, 2023 and 2022, no shares 
of  preferred  stock  were  issued  and  outstanding.  In  May  2022,  the  Company's  stockholders  approved  the  Sixth  Amended  and  Restated  Certificate  of 
Incorporation, which increased the authorized number of shares of common stock to 150,000,000. The Company is authorized to issue 150,000,000 shares 
of common stock as of December 31, 2023 and 2022. 

Reverse Stock Split

In  February  2024,  the  Reverse  Stock  Split  became  effective.  All  share  and  per  share  amounts  of  the  Company's  common  stock  presented  have  been 
retroactively adjusted to reflect the 1-for-12 Reverse Stock Split, including reclassifying an amount equal to the reduction in par value of common stock to 
additional paid-in capital (see Note 15). The Company's authorized shares of common stock remain at 150,000,000 and its authorized shares of preferred 
stock remain at 5,000,000.

Sale of Common Stock

In August 2020, the Company entered into a sales agreement under which the Company may offer and sell shares of its common stock having an aggregate 
offering price of up to $100.0 million through “at-the-market” offerings (2020 ATM), pursuant to its shelf registration statement on Form S-3 on file with 
the SEC. During the year ended December 31, 2023, the Company issued and sold 261,170 shares of common stock under the 2020 ATM, for which the 
Company received net proceeds of $4.5 million, after deducting commissions, fees and expenses. During the year ended December 31, 2022, the Company 
issued  and  sold  25,068  shares  of  common  stock  under  the  2020  ATM,  for  which  the  Company  received  net  proceeds  of  $0.3 million,  after  deducting 
commissions, fees and expenses. 

In  October  2023,  the  Company  entered  into  the  Gilead  Equity  Agreements  pursuant  to  which  Gilead  purchased  1,089,472  shares  of  the  Company’s 
common stock at a purchase price of $13.92 per share for total proceeds of $15.2 million. Of the $15.2 million in proceeds received under the Gilead Equity 
Agreements,  $5.9  million  was  determined  to  be  a  premium  on  the  purchase  of  the  Company’s  common  stock  and  allocated  to  the  single  combined 
performance obligation under the Gilead Collaboration Agreement (see Note 10). The fair value of Gilead's common stock purchase was $9.3 million and 
total proceeds from the issuance of common stock under the Gilead Equity Agreements was $9.1 million, net of $0.2 million in issuance costs. Pursuant to 
the terms of the Gilead Equity Agreements, if the Company completes equity financing by July 15, 2024, which results in at least $30.0 million of proceeds 
to the Company, then, subject to approval by the Company’s stockholders (which was obtained on January 31, 2024), the Company may require Gilead to 
purchase  additional  shares  of  common  stock  from  the  Company  in  an  amount  that  results  in  Gilead  owning  29.9%  of  the  Company’s  then-outstanding 
voting capital stock. If the Company does not complete the equity financing or does not require Gilead to purchase the additional shares, Gilead may elect 
to purchase additional shares of common stock from the Company in an amount that results in Gilead owning 29.9% of the Company’s then-outstanding 
voting capital stock. The purchase price per share for additional shares purchased by Gilead will be equal to the lesser of a 35% premium to the 30-day 
volume weighted average price immediately prior to the date of purchase or a 35% premium to the 30-day  volume  weighted  average  price  immediately 
prior to delivery by Gilead of notice of the anticipated closing date. The Gilead Equity Agreements also include a three-year standstill provision and two-
year lockup provision, with customary exceptions, and provide Gilead with certain other stock purchase rights and 

F-20

 
   
   
 
   
 
 
registration rights, as well as the right to designate two directors to the Company’s board of directors. The Company appointed each of Gilead's designees to 
its board of directors in December 2023 and February 2024.

Note 9 - Stock-Based Compensation

Equity Incentive Plans

In  May  2022,  the  Company’s  stockholders  approved  an  amendment  to  the  2018  Stock  Incentive  Plan  (the  2018  Plan),  which  increased  the  aggregate 
number of shares of common stock reserved under the 2018 Plan to 716,666.

In May 2023, the Company's stockholders approved an amendment to the 2018 Plan, which increased the aggregate number of shares of common stock 
reserved under the 2018 Plan to 883,333.

As of December 31, 2023, the Company had awards outstanding under the following shareholder approved plans: 2010 Equity Incentive Plan (the 2010 
Plan),  which  has  been  frozen;  the  Amended  and  Restated  2014  Stock  Incentive  Plan  (the  2014  Plan);  and  the  2018  Plan.  Shares  of  common  stock 
underlying awards that are forfeited under the 2010 Plan on or after June 2, 2016 will become available for issuance under the 2014 Plan. As of December 
31, 2023, the Company also had awards outstanding under the Assembly Biosciences, Inc. 2017 Inducement Award Plan, the 2019 Inducement Award Plan, 
and  the  Assembly  Biosciences,  Inc.  2020  Inducement  Award  Plan.  As  of  December  31,  2023,  the  Company  also  had  outstanding  options  it  assumed  in 
connection with its merger with Assembly Pharmaceuticals.

The Company issues new shares of common stock to settle options exercised or vested RSUs. The Company also issues new shares of common stock in 
connection with purchases of shares of common stock by eligible employees under the Assembly Biosciences, Inc. Employee Stock Purchase Plan (the 
2018 ESPP).

In  February  2024,  the  Reverse  Stock  Split  became  effective.  All  outstanding  stock  options  and  restricted  stock  units,  as  well  as  the  Company's  equity 
incentive plans presented have been retroactively adjusted to reflect the 1-for-12 Reverse Stock Split (see Note 15). 

Stock Plan Activity

Stock Options

The following table summarizes the stock option activity and related information for 2023:

Outstanding as of December 31, 2022
Granted
Forfeited

Outstanding as of December 31, 2023
Options vested and exercisable as of December 31, 2023    

Number
of Shares

757,418     $
190,591    
(85,098 )  
862,911     $
486,626     $

Weighted
Average
Exercise
Price
Per Share

Weighted
Average
Remaining
Contractual
Term
(Years)

Total
Intrinsic
Value (in
thousands)

84.96      
10.68    
81.24    
69.00      
104.88      

7.1     $

6.7     $
5.1     $

—  

1  
—  

The weighted-average grant-date fair value of options granted was $7.68 and $17.76 during the years ended December 31, 2023 and 2022,  respectively. 
There were no options exercised in 2023 or 2022.  

F-21

 
 
 
 
   
 
 
 
 
   
 
 
 
 
 
   
 
 
 
 
   
   
 
     
   
   
 
     
   
   
RSUs

The following table summarizes RSU activity and related information for 2023:

 Nonvested as of December 31, 2022
 Granted
 Vested
 Forfeited

 Nonvested as of December 31, 2023

Number
of RSUs

Weighted
Average Fair
Value Per RSU
at Grant Price

141,544    
15,936    
(42,898 )  
(19,400 )  
95,182  

$

  $

40.68  
10.68  
53.28  
27.48  
32.64  

The total fair value of RSUs vested and settled during 2023 and 2022 was $2.8 million and $2.2 million, respectively. The total intrinsic value of RSUs 
vested and settled during both 2023 and 2022 was $0.5 million.

In July 2021, the Company granted 26,981 RSUs with performance-based vesting conditions upon the achievement of clinical milestones to the majority of 
employees, including executive officers. The awards had a grant date fair value of $1.2 million and vest upon performance conditions which were deemed 
probable of being met as of December 31, 2022. The Company recognized stock-based compensation expense of $0.3 million and $0.7 million for these
RSUs during the years ended December 31, 2023 and 2022, respectively. 

In March 2022, the Company granted 21,248 RSUs with market-based vesting conditions to members of management, including its executive officers. The 
awards had a grant date fair value of $0.4 million and are being recognized over the derived service period of 1.5 years and vest upon the achievement of
certain market-based conditions which have not been achieved as of December 31, 2023. The Company recognized stock-based compensation expense of 
$0.1 million and $0.2 million for these RSUs during the years ended December 31, 2023 and 2022, respectively.

In  August  2022,  the  Company  granted  43,748  RSUs  with  performance-based  vesting  conditions  upon  the  achievement  of  clinical  milestones  to  its 
executive officers. The awards had a grant date fair value of $1.1 million. Some of the performance conditions were deemed probable of being met as of 
December 31, 2022, with the remaining performance conditions deemed probable of being met as of December 31, 2023. The Company recognized stock-
based compensation expense of $0.6 million and $0.1 million for these RSUs during the years ended December 31, 2023 and 2022, respectively.

Employee Stock Purchase Plan

The 2018 ESPP provides for the purchase by employees of up to an aggregate of 108,333  shares  of  the  Company’s  common  stock  at  a  discount  to  the 
market price. Eligible employees may participate through payroll deductions of up to 15% of such employee’s compensation for each pay period subject to 
annual statutory limits and the 2018 ESPP’s limit of 208 shares of common stock per offering. 

Eligible employees can purchase the Company’s common stock at the end of a predetermined offering period at 85% of the lower of the fair market value at 
the  beginning  or  end  of  the  offering  period.  Under  the  2018  ESPP,  the  offering  periods  end  on  the  last  business  day  occurring  on  or  before  May  14  or 
November 14. The ESPP is compensatory and results in stock-based compensation expense.

In May and November 2023, employees purchased 7,534 and 6,919 shares of common stock, respectively, under the 2018 ESPP. In May and November 
2022, employees purchased 11,240 and 7,579  shares  of  common  stock,  respectively,  under  the  2018  ESPP.  As  of  December  31,  2023, 53,687  shares  of 
common  stock  are  available  for  future  sale  under  the  Company’s  2018  ESPP.  Stock-based  compensation  expense  recorded  in  connection  with  the  2018 
ESPP was $0.1 million for both the years ended December 31, 2023 and 2022.

F-22

 
 
 
 
   
 
 
 
 
   
   
 
   
 
   
 
   
Valuation Assumptions

The Company used the Black-Scholes option-pricing model for determining the estimated fair value and stock-based compensation related to stock options 
and ESPP purchase rights. 

A summary of the assumptions used to estimate the fair values of stock options grants for the years presented is as follows: 

Exercise price
Expected volatility
Risk-free rate
Expected term (years)
Expected dividend yield

Year Ended December 31,

2023
$8.64 - $18.36
77.5% - 87.1%
3.59% - 4.49%
5.5 - 7.5
0%

2022
$18.36 - $29.40
78.5% - 81.7%
1.41% - 4.15%
5.5 - 7.5
0%

The risk-free interest rate assumption was based on the rates for U.S. Treasury zero-coupon bonds with maturities similar to those of the expected term of 
the stock option being valued. The expected dividend yield was zero as the Company currently does not intend to pay dividends in the foreseeable future. 
The  weighted  average  expected  term  of  options  was  calculated  using  the  simplified  method  as  prescribed  by  accounting  guidance  for  stock-based 
compensation  due  to  the  Company’s  limited  history  of  relevant  stock  option  exercise  activity.  The  expected  volatility  was  calculated  based  on  the 
Company’s historical stock prices.

The fair value of ESPP purchase rights and stock appreciation rights were not material for any period presented.

Stock-Based Compensation Expense

The Company recognized stock-based compensation expense included in the consolidated statement of operations and comprehensive loss for the years 
presented (in thousands):

Research and development
General and administrative
Total stock-based compensation expense

Year Ended December 31,

2023

2022

2,116    
3,003  
5,119    

$

$

3,024  
3,569  
6,593  

  $

  $

As of December 31, 2023, there was $2.9 million of total unrecognized stock-based compensation related to outstanding equity awards which is expected to 
be recognized over a weighted average remaining amortization period of 1.5 years.

Note 10 - Collaboration Agreements

The  following  table  summarizes  the  collaboration  revenue  recognized  from  the  Company's  collaboration  agreements  in  the  consolidated  statement  of 
operations and comprehensive loss for the years presented (in thousands):

Gilead
BeiGene, Ltd. (BeiGene)

Total collaboration revenue

Gilead Agreement

Year Ended December 31,

2023

2022

  $

  $

4,430     $
2,733    
7,163     $

—  
—  
—  

In October 2023, the Company entered into the Gilead Collaboration Agreement pursuant to which Gilead will exclusively license to the Company its HPI 
program and NNPI program, while retaining opt-in rights to these programs and have an option to take an exclusive license, on a program-by-program 
basis,  to  all  of  the  Company’s  other  current  and  future  pipeline  programs  for  a  12-year  collaboration  term.  In  addition  to  the  Gilead  Collaboration
Agreement, the Company and Gilead entered into the Gilead Equity Agreements, pursuant to which Gilead purchased 1,089,472 shares of the Company’s 
common stock at a purchase price of $13.92 per share (see Note 8). The Company 

F-23

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
received total proceeds of $100.0 million, consisting of $84.8 million as an upfront payment under the Gilead Collaboration Agreement and $15.2 million 
under the Gilead Equity Agreements.

Pursuant to the terms of the Gilead Collaboration Agreement, during the term and for a specified period thereafter, Gilead may exercise its opt-in rights, on 
a program-by-program basis, at one of two timepoints – completion of a certain Phase 1 study or completion of a certain Phase 2 study for the first product 
within the program – and upon payment of an opt-in fee ranging from $45.0 million to $125.0 million per program depending on the type of program and 
when the option is exercised. If Gilead exercises its opt-in right to any current or future program under the collaboration, the Company is eligible to receive 
up to $330.0 million in potential regulatory and commercial milestones on that program, in addition to royalties ranging from the high single-digits to high 
teens, depending on the clinical stage of the program at the time of the opt-in. Following Gilead’s exercise of its option for each Company program, the 
Company may opt in to cover 40% of the research and development costs in the United States and share 40% of the profits and operating loss in the United 
States for products within the program in lieu of receiving milestones and royalties for that program in the United States, unless the Company later opts out 
of  the  cost/profit  share  for  the  program.  Prior  to  Gilead’s  potential  exercise  of  its  opt-in,  the  Company  will  be  primarily  responsible  for  all  discovery, 
research and development on both the Company’s programs and the two Gilead-contributed programs. Gilead may conduct certain development activities 
related  to  the  Gilead  Collaboration  Agreement  which  will  be  reimbursed  by  the  Company.  Following  Gilead’s  opt-in,  Gilead  will  control  the  further 
discovery,  research,  development,  and  commercialization  on  any  optioned  programs.  During  the  term,  Gilead  will  continue  to  support  the  collaboration 
through extension fees of $75.0 million in each of the third, fifth and seventh years of the collaboration. 

The Gilead Collaboration Agreement is subject to termination by either party for the other party’s uncured, material breach or insolvency. Subject to certain 
limitations, the Company and Gilead both have certain termination for convenience rights, upon sufficient prior written notice, with respect to programs 
that one party in-licenses from the other (subject to Gilead’s option rights), and with respect to Gilead, for programs it has option rights to subject to certain 
time limitations with respect to existing Company programs). Gilead also has a right to terminate the collaborative activities under the Gilead Collaboration 
Agreement at certain specified points during the collaboration term. 

The Company concluded Gilead is a customer and accordingly, the Gilead Collaboration Agreement is within the scope of the revenue from contracts with 
customers guidance. The Company identified a single combined performance obligation for the discovery, research and development services during the 
collaboration term (the R&D Services). The Company concluded the R&D Services are distinct from Gilead's right to obtain an exclusive license to any of 
the Company's programs as Gilead benefits from the knowledge and expertise gained from the R&D Services and the Company's know-how is not highly 
specialized  in  nature.  Gilead  could  perform  the  R&D  Services  themselves,  particularly  considering  Gilead  contributed  its  HPI  and  NNPI  programs  and 
Gilead may continue to conduct development activities on programs being developed under the Gilead Collaboration Agreement. None of the options in the 
contract were deemed to be separate performance obligations as the options did not provide any discounts or other rights which would be considered a 
material right in the arrangement.

The Company determined the Gilead Collaboration Agreement and Gilead Equity Agreements should be assessed as a single combined transaction because 
the agreements were negotiated and entered into together, with a single commercial objective. The Company accounted for the agreements based on the fair 
values of the assets and services exchanged. Of the $15.2 million in proceeds received under the Gilead Equity Agreements, $5.9 million was determined to 
be  a  premium  on  the  purchase  of  the  Company’s  common  stock  and  allocated  to  the  single  combined  performance  obligation  under  the  Gilead 
Collaboration Agreement. As of the effective date of the Gilead Collaboration Agreement, the total transaction price was determined to be $90.7 million. 
The value the Company received from the licenses Gilead contributed are not material within the context of the contract and accordingly, the Company 
made no adjustments to the transaction price for them.

The variable consideration related to the regulatory and commercial milestones has not been included in the transaction price as of December 31, 2023, 
since Gilead has not opted in to take a license to any of the Company's programs. Any variable consideration related to sales-based milestones (including 
royalties) will be recognized when the related sales occur pursuant to the Gilead Collaboration Agreement. The Company will reevaluate the transaction 
price in each reporting period as uncertain events are resolved or other changes in circumstances occur.

F-24

 
The  transaction  price,  including  the  upfront  payment  from  Gilead,  is  reflected  as  collaboration  revenue  when  realized  in  the  Company’s  consolidated 
statements of operations. The Company will recognize revenue over time using a cost-based input method, based on internal and external labor cost effort 
to perform the services, over the initial non-cancellable term of three years since this method best reflects the transfer of services to Gilead. In applying a 
cost-based  input  method  of  revenue  recognition,  the  Company  uses  actual  costs  incurred  relative  to  estimated  total  costs  to  fulfill  each  performance 
obligation. A cost-based input method of revenue recognition requires the Company to make estimates of costs to complete the performance obligation. 
The cumulative effect of any revisions to estimated costs to complete the performance obligation and associated variable consideration will be recorded in 
the period in which changes are identified and amounts can be reasonably estimated. A significant change in these assumptions and estimates could have a 
material impact on the timing and amount of revenue recognized in future periods.

The Company recognized collaboration revenue of $4.4 million during the year ended December 31, 2023. The transaction price for future collaborative 
activities was recorded as deferred revenue on the consolidated balance sheet as of December 31, 2023, of which $30.9 million was included in deferred 
revenue - short-term and $55.4 million was included in deferred revenue - long-term. During the year ended December 31, 2023, the Company did not 
make any payments to Gilead. 

Antios Agreement

In  July  2021,  the  Company  and  Antios  Therapeutics,  Inc.  (Antios)  entered  into  a  Clinical  Trial  Collaboration  Agreement  (the  Antios  Agreement)  to 
collaborate  on  a  triple  combination  therapy  using  VBR  and  Antios’s  active  site  polymerase  inhibitor  nucleotide  ATI-2173  for  the  treatment  of  HBV. 
Assembly and Antios were individually responsible for the study’s manufacturing costs but equally shared the remaining costs of the study. Antios was 
responsible for conducting the clinical trial with Assembly reimbursing Antios its share of expenses. In May 2022, the Company was notified by Antios 
that ATI-2173 had been placed on clinical hold by the FDA following submission of a safety report involving a patient who received a triple combination of 
VBR, ATI-2173 and a nucleos(t)ide analog reverse transcriptase inhibitor (NrtI). Due to the clinical hold, the Company terminated the Antios Agreement 
effective May 2022.

There were no costs incurred during the year ended December 31, 2023. During the year ended December 31, 2022, the Company incurred $0.4 million in 
research and development expenses under the Antios Agreement. 

Arbutus Biopharma Agreement

In August 2020, the Company and Arbutus Biopharma Corporation (Arbutus Biopharma) entered into a Clinical Trial Collaboration Agreement (Arbutus 
Biopharma Agreement) to conduct a randomized, multi-center, open-label Phase 2 clinical trial to explore the safety, pharmacokinetics and antiviral activity 
of  the  triple  combination  of  VBR,  AB-729  and  an  NrtI  compared  to  the  double  combinations  of  VBR  with  a  NrtI  and  AB-729  with  a  NrtI.  Under  the 
Arbutus Biopharma Agreement, Assembly and Arbutus Biopharma share responsibility for the costs of the trial equally, excluding manufacturing supply 
which are the burden of each company to supply their respective drugs, VBR and AB-729. Assembly is responsible for conducting this clinical trial with 
Arbutus Biopharma reimbursing Assembly its share of expenses. In February 2023, Assembly and Arbutus Biopharma decided to terminate the Phase 2 
clinical trial early, at the end of the 48-week on-treatment period, and are in the process of closing the study.

The Arbutus Biopharma Agreement is within the scope of the collaborative arrangements guidance as both parties are active participants and are exposed to 
significant risks and rewards dependent on the success of the collaborative activity. Reimbursements and cost-sharing portions from Arbutus Biopharma are 
reflected  as  a  reduction  of  research  and  development  expense  when  realized  in  the  Company’s  consolidated  statements  of  operations.  The  Company 
recognized a reduction of research and development expense of $1.6 million and $2.7 million under the Arbutus Biopharma Agreement during the years 
ended December 31, 2023 and 2022, respectively.

F-25

 
BeiGene Agreement

In July 2020, the Company and BeiGene entered into a Collaboration Agreement (the BeiGene Agreement) to develop and commercialize the Company’s 
novel core inhibitor product candidates vebicorvir (VBR), ABI-H2158 (2158) and ABI-H3733 (3733) for chronic HBV infection (the Licensed Product 
Candidates)  in  the  People’s  Republic  of  China,  Hong  Kong,  Taiwan  and  Macau  (the  Territory).  Under  the  agreement,  the  Company  and  BeiGene  are 
collaborating on certain global clinical studies and both the Company and BeiGene will independently conduct other clinical studies in their own respective 
territories. During the term of the BeiGene Agreement, neither party will commercialize any competing products in the Territory. In September 2021, the 
Company discontinued development of 2158 following the observation of elevated alanine transaminase levels in the Phase 2 clinical study consistent with 
drug-induced hepatotoxicity, and in July 2022, the Company discontinued clinical development of VBR because it did not achieve functional cure or finite 
treatment in its two- and three-drug combination studies. In conjunction with the Company entering into the Gilead Collaboration Agreement with Gilead 
in October 2023, the Company discontinued further development and will no longer seek partnering of 3733. As of the Company's discontinuation of 3733 
development, there are no remaining products in development which have been licensed to BeiGene.

Pursuant  to  the  terms  of  the  BeiGene  Agreement,  the  Company  received  an  upfront  cash  payment  of  $40.0  million  from  BeiGene  for  the  delivery  of 
exclusive,  royalty-bearing  licenses  to  develop  and  commercialize  the  Licensed  Product  Candidates  in  the  Territory,  and  the  Company  was  eligible  to 
receive up to approximately $500.0 million in cash milestone payments, comprised of up to $113.8 million for development and regulatory milestones and 
up to $385.0 million in net sales milestones. In addition, the Company was eligible to receive tiered royalties at percentages ranging from the mid-teens to 
the low thirties of net sales. Due to the discontinuation of development of VBR, 2158 and 3733, the Company is not eligible to receive any development 
and regulatory milestones or net sales milestones.

The BeiGene Agreement is within the scope of the collaborative arrangements guidance as both parties are active participants and are exposed to significant 
risks and rewards dependent on the success of commercializing the Licensed Product Candidates in the Territory but that the unit of account related to the 
delivery  of  Licensed  Product  Candidates  is  within  the  scope  of  the  contract  with  customers  guidance.  The  Company  identified  the  following  material 
promises related to the contract with customers unit of account under the BeiGene Agreement: 1) the transfer of the VBR License, 2) the transfer of the 
2158 License, and 3) the transfer of the 3733 License. The Company concluded each of these licenses to be functional as they have significant standalone 
functionality and grant BeiGene the right to use the Company’s intellectual property as it exists on the effective date of the license. The Company estimated 
the SSP of the licenses using an income-based valuation approach for the estimated value a licensor of the compounds would receive considering the stage 
of the compound’s development. 

The  transaction  price  at  the  inception  of  the  agreement  was  limited  to  the  $40.0  million  upfront  payment.  The  variable  consideration  related  to  the 
remaining  development  and  commercialization  milestone  payments  has  not  been  included  in  the  transaction  price  as  these  were  fully  constrained  as  of 
December 31, 2023 and 2022. Following the discontinuation of development and decision to no longer seek partnering of 3733, the obligation related to the 
technology transfer associated with the license of 3733 was considered to be complete. Accordingly, the Company recognized $2.7 million as collaboration 
revenue for the amount allocated to 3733 during the year ended December 31, 2023. No revenue was recognized during the year ended December 31, 2022. 
As of December 31, 2023 and 2022, there were no remaining performance obligations under the BeiGene Agreement. The transaction price allocated to 
3733 of $2.7 million was recorded as a long-term deferred revenue contract liability on the consolidated balance sheet as of December 31, 2022. During the 
years  ended  December  31,  2023  and  2022,  the  Company  did  not  recognize  any  increase  or  reduction  of  research  and  development  expense  under  the 
BeiGene Agreement. 

The Company incurred $3.5 million in incremental costs of obtaining the BeiGene Agreement. These contract costs have been capitalized and are being 
recognized  consistent  with  the  pattern  of  recognition  of  revenue  associated  with  the  Licensed  Product  Candidates.  As  of  December  31,  2023,  no 
unamortized contract costs remained. As of December 31, 2022, the remaining unamortized contract costs were $0.2 million and were included in other 
assets on the consolidated balance sheet.

F-26

 
Note 11 – Strategic License Agreements

HBV Research Agreement with Indiana University

Since September 2013, the Company has been party to an exclusive License Agreement dated September 3, 2013 with Indiana University Research and 
Technology Corporation (IURTC) from whom it has licensed aspects of the Company’s HBV program held by IURTC. The license agreement requires the 
Company  to  make  milestone  payments  based  upon  the  successful  accomplishment  of  clinical  and  regulatory  milestones.  The  aggregate  amount  of  all 
performance milestone payments under the IURTC license agreement, should all milestones through development be met, is $0.8 million, with a portion 
related to the first performance milestone having been paid. The Company is obligated to pay IURTC royalty payments based on net sales of the licensed 
technology as well as a portion of any sublicensing revenue Assembly receives. The Company is also required to pay diligence maintenance fees each year 
to the extent that the royalty, sublicensing, and milestone payments to IURTC are less than such fees for that year. In February 2024, following its decision 
to discontinue further development or partnering for 3733, the Company terminated the IURTC license agreement, which will become effective April 2024. 
The Company paid IURTC $0.1 million in diligence maintenance fees during both the years ended December 31, 2023 and 2022, which are included in 
research and development expenses in the consolidated statements of operations and comprehensive loss. 

Door Pharma Agreement

In  November  2020,  the  Company  and  Door  Pharmaceuticals,  LLC  (Door  Pharma)  entered  into  an  exclusive,  two-year  Collaboration  Agreement  and 
Sublicense  Agreement  (collectively,  the  Door  Pharma  Agreement)  focused  on  the  development  of  a  novel  class  of  HBV  inhibitors.  The  Company 
terminated the Door Pharma Agreement in May 2022, which became effective September 2022, to focus its resources on its other internal HBV programs 
and  its  programs  targeting  other  viruses.  Under  the  terms  of  the  Door  Pharma  Agreement,  the  Company  was  obligated  to  continue  to  reimburse  Door 
Pharma for certain research and development costs through September 2022 following which such reimbursements ceased.

Under  the  consolidation  accounting  standard,  the  Company  determined  Door  Pharma  was  a  VIE.  The  Company  did  not  have  the  power  to  direct  the 
activities  that  most  significantly  affected  the  economic  performance  of  Door  Pharma  and  as  such  the  Company  was  not  the  primary  beneficiary  and 
consolidation was not required prior to the termination of the agreement in May 2022. 

The  Company  did  not  incur  any  research  and  development  funding  during  the  year  ended  December  31,  2023.  The  Company  incurred  research  and 
development funding of $1.6 million during the year ended December 31, 2022. 

Microbiome Purchase Agreement 

In December 2021, the Company entered into an asset purchase agreement (the Microbiome Purchase Agreement) with a third party pursuant to which the 
Company sold know-how, patents, materials and regulatory filings for the Company’s Microbiome program. The sale included ABI-M201 (M201), which 
had been the Company’s lead candidate in its Microbiome program. As consideration for the sale, the Company was entitled to receive $3.0  million,  of
which $1.5 million was received in 2021 and the remaining $1.5 million was received in 2022. The Company is also entitled to receive a $10.0 million 
milestone payment upon the achievement of a regulatory approval milestone as defined in the purchase agreement. The variable consideration relating to 
the $10.0 million milestone has not been included in the transaction price as it was fully constrained as of December 31, 2023 and 2022. As part of the 
Company’s evaluation of the development milestone constraint, it determined the achievement of the milestone is contingent upon success in future clinical 
studies and regulatory approvals which are not within its control and uncertain at this stage. 

F-27

 
Note 12 - Income Taxes

Income tax benefit is as follows (in thousands): 

Current:
Federal
State
Foreign

Deferred:
Federal
State
Foreign

Income tax expense

December 31,

2023

2022

  $

  $

33     $
—    
—    
33    

—    
—    
—    
—    
33     $

The effective tax rate of the Company's provision for income taxes differs from the federal statutory rate as follows:

As of December 31,

2023

2022

Statutory federal income tax rate
State taxes, net of federal tax benefit
Research and development tax credits
Return to provision adjustments
Uncertain tax positions
Stock-based compensation
Other
Change in valuation allowance
Income taxes provision (benefit)

21.0 %   
7.7      
4.4      
0.3      
(0.9 )    
(1.7 )    
(0.5 )    
(30.4 )    
-0.1 %   

Significant components of the Company’s deferred taxes are as follows (in thousands):

As of December 31,

2023

2022

Deferred tax assets:

Federal and state-operating loss carryforwards
Stock-based compensation
Capitalized research expense
Operating lease liabilities
Research and development credits
Other

Total deferred tax assets
Valuation allowance
Deferred tax asset, net of valuation allowance

Deferred tax liabilities:

Operating lease right-of-use assets
Other

Total deferred tax liabilities
Net deferred tax liability

  $

  $

  $

  $

148,119     $
9,948    
28,578    
594    
15,816    
19    
203,074    
(202,428 )  

646     $

(593 )   $
(53 )  
(646 )  

—     $

—  
—  
—  
—  

—  
—  
—  
—  
—  

21.0 %
8.3  
3.3  
—  
(0.7 )
(2.9 )
(0.2 )
(28.8 )
0.0 %

144,165  
9,919  
15,004  
880  
13,471  
1,372  
184,811  
(184,000 )
811  

(811 )
—  
(811 )
—  

The Company maintains a valuation allowance on deferred tax assets due to the uncertainty regarding the ability to utilize these deferred tax assets in the 
future. The valuation allowance increased by $18.4 million and $26.9 million 

F-28

 
 
 
 
 
 
   
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
     
   
 
 
 
 
 
 
 
for  the  years  ended  December  31,  2023  and  2022,  respectively,  primarily  due  to  an  increase  in  the  Company’s  federal  and  state-operating  loss 
carryforwards. 

Net operating loss and tax credit carryforwards as of December 31, 2023 are as follows (in thousands):

Net operating losses, federal (post December 31, 2017)
Net operating losses, federal (pre January 1, 2018)
Net operating loss, state (Indefinite)
Net operating loss, state (Definite)
Research and development tax credits, federal
Research and development tax credits, state

Amount

  $

401,038    
123,552    
880    
592,044    
15,203    
6,108    

Expiration Years
Indefinite
2027 - 2037
Indefinite
2031 - 2041
2028 - 2041
Indefinite

Pursuant  to  Internal  Revenue  Code  (IRC),  Sections  382  and  383,  use  of  the  Company’s  U.S.  federal  and  state  net  operating  loss  and  research  and 
development income tax credit carryforwards may be limited in the event of a cumulative change in ownership of more than 50.0% within a three-year 
period. The Company has performed an ownership change study through December 31, 2022 and has determined a “change in ownership” as defined by 
IRC Section 382 and the rules and regulations promulgated thereunder, did occur in December 2010, January 2013 and October 2014. The Company has 
adjusted its net operating loss carryovers to appropriately reflect any attributes which will expire due to the limitation. The Company has not completed any 
additional analysis for IRC Sections 382 and 383 and there is a risk additional changes in ownership could have occurred since December 31, 2022. If a 
change in ownership were to have occurred, additional net operating loss and tax credit carryforwards could be eliminated or restricted. If eliminated, the 
related asset would be removed from the deferred tax asset schedule with a corresponding reduction in the valuation allowance.

The following table summarizes activity related to the Company’s gross unrecognized tax benefits (in thousands):

Balances as of beginning of year
Increases related to prior year tax positions
Decreases related to prior year tax positions
Increases related to current year tax positions
Balances as of end of year

As of December 31,

2023

2022

3,873     $
47    
—    
575    
4,495     $

3,237  
—  
(36 )
672  
3,873  

  $

  $

The unrecognized tax benefits, if recognized, would not have an impact on the Company’s effective tax rate assuming the Company continues to maintain a 
full  valuation  allowance  position.  Based  on  the  prior  year’s  operations  and  experience,  the  Company  does  not  expect  a  significant  change  to  its 
unrecognized  tax  benefits  over  the  next  twelve  months.  The  unrecognized  tax  benefits  may  increase  or  change  during  the  next  year  for  unexpected  or 
unusual  items  that  arise  in  the  ordinary  course  of  business.  In  subsequent  periods,  any  interest  and  penalties  related  to  uncertain  tax  positions  will  be 
recognized as a component of income tax expense.

The Company files income tax returns in the U.S. federal, California and other state and foreign jurisdictions and is not currently under examination by 
federal, state, or local taxing authorities for any open tax years. Due to net operating loss carryforwards, all years effectively remain open for income tax 
examination by tax authorities in the U.S. and states in which the Company files tax returns.

F-29

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
Note 13 - Leases

Operating Leases

In  August  2023,  the  Company  entered  into  a  sublease  agreement  for  office  and  laboratory  space  in  South  San  Francisco,  California  to  serve  as  the 
Company's  new  corporate  headquarters.  The  sublease  contains  scheduled  annual  rent  increases  over  the  lease  term  and  expires  in  October  2025.  The 
Company has the option to extend the sublease through September 30, 2029. The option to extend the Company's corporate headquarters sublease through 
2029  is  not  included  in  the  Company's  ROU  assets  or  lease  liabilities.  The  Company's  previous  corporate  headquarters  sub-sublease  in  South  San 
Francisco,  California  expired  in  December  2023.  The  Company  also  leased  office  space  in  Carmel,  Indiana  under  a  lease  agreement,  which  expired  in 
August 2023. In February 2021, the Company subleased substantially all of the office space under lease in Carmel, Indiana for the remainder of its term. 
The Company’s China subsidiary leases a registrational office in Shanghai, which expires in March 2024. The Company's registrational office in Beijing, 
which was month-to-month, ended in 2023. The Company also leases certain laboratory equipment accounted for as operating leases expiring at various 
dates, with the final lease expiring in 2025. 

When the Company cannot determine the implicit rate in its leasing arrangements, the Company uses its incremental borrowing rate as the discount rate 
when measuring operating lease liabilities. The incremental borrowing rate represents an estimate of the interest rate the Company would incur at lease 
commencement  to  borrow  an  amount  equal  to  the  lease  payments  on  a  collateralized  basis  over  the  term  of  a  lease  within  a  particular  currency 
environment.

At December 31, 2023, the Company had operating lease liabilities of $2.3 million and ROU assets of $2.3 million.

The following summarizes quantitative information about the Company’s operating leases (in thousands):

Lease cost

Operating lease cost
Short-term lease cost
Variable lease cost
Sublease income

Total lease cost, net

Year Ended December 31,

2023

2022

  $

  $

3,507     $
12    
1,504    
(102 )  
4,921     $

3,505  
23  
1,573  
(153 )
4,948  

As  of  December  31,  2023,  the  weighted-average  remaining  lease  term  for  operating  leases  was  2.5  years  and  the  weighted-average  discount  rate  for 
operating leases was 10.0%.

As of December 31, 2023, the maturities of the Company’s operating lease liabilities were as follows (in thousands):

2024
2025
Total
Less: present value discount
Operating lease liabilities

Note 14 - Employee Benefit Plan

$

$

1,400  
1,174  
2,574  
(232 )
2,342  

In January 2018, the Company established a defined contribution 401(k) plan (the Plan) for all employees who are at least 21 years of age. Employees are 
eligible to participate in the Plan upon commencement of employment. Under the terms of the Plan, employees may make voluntary contributions as a 
percentage of compensation. The Plan also permits the Company to make discretionary matching contributions. During the years ended December 31, 2023 
and 2022, the Company made discretionary matching contributions of $0.7 million and $0.8 million, respectively.

F-30

 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Note 15 - Subsequent Event

Reverse Stock Split

In September 2023, the Company received a letter from the Listing Qualifications Department of the Nasdaq Stock Market notifying the Company, as the 
bid price for its common stock had closed below $1.00 per share for the last 30 consecutive business days, it was not in compliance with Nasdaq Listing 
Rule 5450(a)(1), which is the minimum bid price requirement for continued listing on the Nasdaq Global Select Market. In accordance with Nasdaq Listing 
Rule 5810(c)(3)(A), the Company was provided a 180-calendar day period, or until March 25, 2024, to regain compliance with the minimum bid price 
requirement. The continued listing standard would be met once the closing bid price of the Company’s common stock was at least $1.00 per share for a 
minimum of ten consecutive business days during the 180-calendar day period. In January 2024, the Company's stockholders approved a reverse stock split 
of its common stock at a range of ratios between 1-for-7 to 1-for-17, and the Company's board of directors approved the implementation of the Reverse 
Stock Split at a ratio of 1-for-12. The Reverse Stock Split was effective as of February 9, 2024 and the Company regained compliance with the minimum 
bid price requirement in February 2024.

As of the effective time of the Reverse Stock Split, every 12 issued and outstanding shares of the Company’s common stock was automatically reclassified 
into one issued and outstanding share of the Company’s common stock. This reduced the number of shares outstanding from 65.8 million shares to 5.5 
million  shares.  The  Reverse  Stock  Split  does  not  affect  the  number  of  authorized  shares  of  common  stock  or  the  par  value  of  the  common  stock.  No 
fractional shares of common stock were issued in connection with the Reverse Stock Split and all fractional shares were rounded down to the nearest whole 
share with respect to outstanding shares of common stock. Any holders of common stock who would have otherwise received a fractional share of common 
stock pursuant to the Reverse Stock Split, received cash in lieu of the fractional share. All share and per share amounts of the Company's common stock 
presented have been retroactively adjusted to reflect the 1-for-12 Reverse Stock Split, including reclassifying an amount equal to the reduction in par value 
of common stock to additional paid-in capital.

F-31

 
SIXTH AMENDED AND RESTATED
CERTIFICATE OF INCORPORATION
OF
ASSEMBLY BIOSCIENCES, INC.

Exhibit 3.1

(Pursuant to Sections 242 and 245 of the General Corporation Law of the State of Delaware)

Assembly Biosciences, Inc., a corporation organized and existing under and by virtue of the provisions of the General Corporation Law of the 

State of Delaware (the “DGCL”), certifies that:

A. The name of the corporation is “Assembly Biosciences, Inc.” (the “Corporation”).

B. The Corporation’s original Certificate of Incorporation was filed with the Secretary of State of the State of Delaware on October 7, 2005, 

under the name South Island Biosciences, Inc., an Amended and Restated Certificate of Incorporation was filed with the Secretary of State of the State of 
Delaware on October 24, 2005, a Second Amended and Restated Certificate of Incorporation, which included a provision to change the Corporation’s name 
to Ventrus Biosciences, Inc., was filed with the Secretary of State of the State of Delaware on April 5, 2007, a Third Amended and Restated Certificate of 
Incorporation was filed with the Secretary of the State of Delaware on November 10, 2010 (the “Third Amended and Restated Certificate of 
Incorporation”) and a Certificate of Amendment of the Third Amended and Restated Certificate of Incorporation was filed with the Secretary of State of 
Delaware on July 10, 2014, which included a provision to change the Corporation’s name to Assembly Biosciences, Inc., a Fourth Amended and Restated 
Certificate of Incorporation was filed with the Secretary of the State of Delaware on May 31, 2018, a Fifth Amended and Restated Certificate of 
Incorporation was filed with the Secretary of State of the State of Delaware on June 12, 2020 (the “Fifth Amended and Restated Certificate of 
Incorporation”).

C. This Sixth Amended and Restated Certificate of Incorporation (the “Certificate of Incorporation”) was duly adopted in accordance with 

Sections 242 and 245 of the DGCL, and hereby amends and restates in its entirety the Fifth Amended and Restated Certificate of Incorporation as follows. 

The name of the corporation is “Assembly Biosciences, Inc.” (the “Corporation”).

ARTICLE II

ARTICLE I

The registered office of the Corporation in the State of Delaware is 251 Little Falls Drive, in the City of Wilmington, County of New Castle 

19808. The name of the registered agent of the Corporation at such address is Corporation Service Company.

ARTICLE III

The nature of the business or purposes to be conducted or promoted is to engage in any lawful act or activity for which corporations may be 

organized under the DGCL.

ARTICLE IV

The total number of shares that the Corporation shall have authority to issue, is 155,000,000 (one hundred fifty-five million), consisting of (i) 
150,000,000 (one hundred fifty million) shares of common stock, $0.001 par value per share, and (ii) 5,000,000 (five million) shares of preferred stock, 
$0.001 par value per share.

 
The board of directors is authorized to issue the preferred stock, subject to limitations prescribed by law and the provisions of this Certificate of 

Incorporation, as shares of preferred stock in one or more series, and is authorized, by filing a certificate of designation pursuant to the applicable law of the 
State of Delaware, to establish from time to time the number of shares to be included in each such series, and to fix the designation, powers, preferences 
and rights of the shares of each such series and qualifications, limitations or restrictions thereof. The authority of the board of directors with respect to each 
series shall include, but not be limited to, determination of the following:

(i)

the number of shares constituting that series and the distinctive designation of that series;

dates, and the relative rights of priority, if any, of payment of dividends on shares of that series;

(ii)

the dividend rate, if any, on the shares of that series, whether dividends shall be cumulative, and, if so, from which date or 

(iii)
the terms of such rights;

whether that series shall have voting rights or powers, in addition to the voting rights and powers provided by law, and, if so, 

for adjustment of the conversion rate in such events as the board of directors shall determine;

(iv)

whether that series shall have conversion rights, and, if so, the terms and conditions of such conversion, including provisions 

(v)

whether or not the shares of that series shall be redeemable, and, if so, the terms and conditions of such redemption, including 

the dates or dates upon or after which they shall be redeemable, and the amount per share payable in case of redemption, which amount may vary under 
different conditions and at different redemption dates;

amounts of such sinking fund;

(vi)

whether that series shall have a sinking fund for the redemption or purchase of shares of that series, and, if so, the terms and 

Corporation, and the relative rights of priority, if any, of payment of shares of that series; and

(vii)

the rights of the shares of that series in the event of voluntary or involuntary liquidation, dissolution or winding up of the 

(viii)

any other rights, preferences and limitations of that series.

The board of directors, within the limits and restrictions stated in any resolution or resolutions of the board of directors originally fixing the 
number of shares constituting any series, may increase or decrease (but not below the number of shares of such series then outstanding) the number of 
shares of any series subsequent to the issue of shares of that series.

ARTICLE V

Subject to all the rights, powers and preferences of the preferred stock and except as otherwise required by law or provided in this Certificate of 

Incorporation (including in any certificate of designations of any series of preferred stock):

(a) the holders of the common stock shall have the exclusive right to vote for the election of directors of the Corporation 
and on all other matters requiring stockholder action, each outstanding share entitling the holder thereof to one vote on each matter properly submitted to 
the stockholders of the Corporation for their vote;

(b) dividends may be declared and paid or set apart for payment upon the common stock out of any assets or funds of the 
Corporation legally available for the payment of dividends, but only when and as declared by the board of directors or any authorized committee thereof; 
and

 
 
Corporation shall be distributed pro rata to the holders of the common stock.

(c) upon the voluntary or involuntary liquidation, dissolution or winding up of the Corporation, the net assets of the 

ARTICLE VI

Any action required or permitted to be taken by the stockholders of the Corporation must be effected at a duly called annual or special meeting of 

the stockholders of the Corporation and may not be effected by any consent in writing by such stockholders. 

ARTICLE VII

Except as otherwise required by statute and subject to the rights, if any, of the holders of any series of preferred stock, special meetings of the 

stockholders of the Corporation may be called, at any time for any purpose or purposes as is proper for stockholder action under the DGCL by (1) the board 
of directors acting pursuant to a resolution duly adopted by a majority of the board of directors then in office, (2) the Chairperson of the board of directors, 
(3) the Chief Executive Officer, or (4) the Chief Executive Officer or secretary of the Corporation upon the written request of stockholder(s) owning (as 
defined below) at least 25% (in the aggregate) of the then voting power of all shares of the Corporation entitled to vote on the matters to be brought before 
the proposed special meeting, in each case subject to any procedures, terms and conditions as may be further set forth in the bylaws of the Corporation from 
time to time. Only those matters set forth in the notice of the special meeting or brought by or at the direction of the board of directors may be considered or 
acted upon at a special meeting of stockholders. In the case of a special meeting of stockholders called pursuant to the foregoing clause (4), the requesting 
holder(s) must (i) continue to own (for the holding period set forth in the bylaws of the Corporation as in effect from time to time) shares representing at 
least 25% (in the aggregate) of the then voting power of all shares of the Corporation entitled to vote on the matters to be brought before the proposed 
special meeting, (ii) provide information in writing regarding such stockholder(s), their stock ownership and the matters that they request to bring before 
the proposed special meeting and (iii) comply with procedures and other terms and conditions relating to special meetings as set forth in the bylaws of the 
Corporation from time to time. For purposes of this Article VII, a holder shall be deemed to “own” only those shares for which it possesses both (x) full 
voting and investment rights pertaining to such shares, and (y) a full economic interest in (including the opportunity for profit from and the risk of loss on) 
such shares, which term may be further defined in the bylaws of the Corporation from time to time.

ARTICLE VIII

8.1.General.  The business and affairs of the Corporation shall be managed by or under the direction of the board of directors except as otherwise 

provided herein or required by law.

8.2.Election of directors.  Unless and except that the bylaws of the Corporation shall so require, the election of directors need not be by written 

ballot.

8.3.Vacancies.  Any director may resign at any time upon notice given in writing or electronic transmission to the Corporation. When one or 

more directors so resigns and the resignation is effective at a future date, a majority of the directors then in office, including those who have so resigned, 
shall have power to fill such vacancy or vacancies, the vote thereon to take effect when such resignation or resignations shall become effective, and each 
director so chosen shall hold office as provided in this paragraph in the filling of other vacancies.

Vacancies and newly created directorships resulting from any increase in the authorized number of directors elected by all of the stockholders 

having the right to vote as a single class may be filled by a majority of the directors then in office, although less than a quorum, or by a sole remaining 
director.

Whenever the holders of any class or classes of stock or series thereof are entitled to elect one or more directors by the provisions of this 

Certificate of Incorporation, vacancies and newly created directorships of such class or classes or series may be filled by a majority of the directors elected 
by such class or classes or series thereof then in office, or by a sole remaining director so elected.

 
 
Any director appointed in accordance with this Section 8.3 shall hold office for the remainder of the full term of the director in which the new 
directorship was created or the vacancy occurred and until such director’s successor shall have been duly elected and qualified or until his or her earlier 
resignation, death or removal.

ARTICLE IX

To the fullest extent permitted by the DGCL as the same exists or as may hereafter be amended, no present or former director of the Corporation 

shall be personally liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director except for liability (a) for 
any breach of the director’s duty of loyalty to the Corporation or its stockholders, (b) for acts or omissions not in good faith or which involve intentional 
misconduct or a knowing violation of law, (c) unlawful payments of dividends or unlawful stock repurchases or redemptions under Section 174 of the 
DGCL or (d) for any transaction from which the director derived an improper personal benefit.  If the DGCL is amended after the effective date of this 
Certificate of Incorporation to authorize corporate action further eliminating or limiting the personal liability of directors, then the liability of a director of 
the Corporation shall be eliminated or limited to the fullest extent permitted by the DGCL, as so amended. Neither any amendment nor repeal of this 
Article, nor the adoption of any provision of this Certificate of Incorporation inconsistent with this Article, shall eliminate or reduce the effect of this 
Article in respect of any matter occurring, or any cause of action, suit or claim that, but for this Article, would accrue or arise, prior to such amendment, 
repeal or adoption of an inconsistent provision.

ARTICLE X

The Corporation shall have the power to indemnify any person who was or is a party or is threatened to be made a party to, or testifies in, any 
threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative in nature, by reason of the fact such 
person is or was a director, officer or employee or agent of the Corporation, or is or was serving at the request of the Corporation as a director, officer, 
employee or agent of another corporation, partnership, joint venture, employee benefit plan, trust or other enterprise against expenses (including attorney’s 
fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding to 
the full extent permitted by law, and the Corporation may adopt bylaws or enter into agreements with any such person for the purpose of providing for such 
indemnification.

ARTICLE XI

The Corporation reserves the right at any time, and from time to time, to amend, alter, change or repeal any provision contained in this Certificate 

of Incorporation, and other provisions authorized by the laws of the State of Delaware at the time in force may be added or inserted, in the manner now or 
hereafter prescribed by law; and all rights, preferences, powers and privileges of whatsoever nature conferred upon stockholders, directors or any other 
persons whomsoever by and pursuant to this Certificate of Incorporation in its present form or as hereafter amended are granted subject to the rights 
reserved in this article.

In furtherance and not in limitation of the powers conferred by the laws of the State of Delaware, the board of directors of the Corporation is 

expressly authorized to make, alter and repeal the bylaws of the Corporation. 

ARTICLE XII

 
 
IN WITNESS WHEREOF, the undersigned has signed this Sixth Amended and Restated Certificate of Incorporation this 25th day of May 

2022.

By: 

  /s/ John G. McHutchison, A.O., M.D.
  John G. McHutchison, A.O., M.D.
  Chief Executive Officer and President

 
 
 
 
 
 
DESCRIPTION OF THE COMPANY’S SECURITIES 
REGISTERED PURSUANT TO SECTION 12 OF THE 
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED 

Exhibit 4.2

Assembly Biosciences, Inc. (Assembly, the Company, we, us and our) had one class of securities registered under Section 12 of the Securities Exchange 
Act of 1934, as amended: our common stock.

The following description of our capital stock does not purport to be complete and is subject to, and qualified in its entirety by, our Sixth Amended and 
Restated Certificate of Incorporation, as amended (our Certificate of Incorporation), and our amended and restated bylaws (our Bylaws), each of which is 
filed or incorporated by reference as an exhibit to the Annual Report on Form 10-K with which this Exhibit 4.2 is filed or incorporated by reference.

DESCRIPTION OF CAPITAL STOCK

Authorized Capital Stock

Our  authorized  capital  stock  consists  of  150,000,000  shares  of  common  stock,  par  value  $0.001  per  share,  and  5,000,000  shares  of  preferred  stock,  par 
value $0.001 per share. 

Common Stock

The holders of our common stock are entitled to one vote per share on all matters to be voted on by the stockholders, and there are no cumulative voting 
rights.

The holders of common stock are entitled to receive ratable dividends, if any, payable when and as declared by our board of directors or any authorized 
committee thereof out of assets or funds legally available therefor, subject to any preferential rights that may be applicable to any outstanding preferred 
stock. In the event of a liquidation, dissolution or winding up of our company, after payment in full of all outstanding debts and other liabilities, the holders 
of common stock are entitled to share ratably in all remaining assets, subject to prior distribution rights of preferred stock, if any, then outstanding. No 
shares of common stock have preemptive rights or other subscription rights to purchase additional shares of common stock. There are no redemption or 
sinking fund provisions applicable to the common stock. 

Listing

Our common stock is listed on The Nasdaq Global Select Market under the symbol “ASMB.”

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Equiniti Trust Company, LLC. The transfer agent and registrar’s address is 48 Wall Street, Floor 
23, New York, NY 10005.

Preferred Stock

Our board of directors is authorized to issue up to 5,000,000 shares of preferred stock in one or more series without stockholder approval. Our board of 
directors may determine the rights, preferences, privileges and restrictions, including voting rights, dividend rights, conversion rights, redemption privileges 
and liquidation preferences, of each series of preferred stock. The purpose of authorizing our board of directors to issue preferred stock in one or more 
series and determine the number of shares in the series and its rights and preferences is to eliminate delays associated with a stockholder vote on specific 
issuances. The existence of authorized but unissued shares of preferred stock may enable our board of directors to render more difficult or to discourage an 
attempt to obtain control of us by means of a merger, tender offer, proxy contest or otherwise. The rights of holders of our common stock described above 
will be subject to, and may be adversely affected by, the rights of any preferred stock that we may designate and issue in the future. The issuance of shares 
of preferred stock could decrease the amount of earnings and assets available for distribution to holders of shares of common stock. The issuance may also 
adversely affect the rights and powers, including voting rights, of these holders and may have the effect of delaying, deterring or preventing a change in 
control of us.

Provisions of our Certificate of Incorporation and Bylaws and Delaware Anti-Takeover Law

Certain  provisions  of  the  Delaware  General  Corporation  Law  (the  DGCL),  our  Certificate  of  Incorporation  and  our  Bylaws  could  have  the  effect  of 
delaying, deferring or discouraging another party from acquiring control of us. These provisions, which are summarized below, are expected to discourage 
certain  types  of  coercive  takeover  practices  and  inadequate  takeover  bids  and,  as  a  consequence,  they  might  also  inhibit  temporary  fluctuations  in  the 
market  price  of  our  common  stock  that  often  result  from  actual  or  rumored  hostile  takeover  attempts.  These  provisions  are  also  designed  in  part  to 
encourage anyone seeking to acquire control of us or considering unsolicited tender offers or other unilateral takeover proposals to first negotiate with our 
board  of  directors  rather  than  pursue  non-negotiated  takeover  attempts.  These  provisions  might  also  have  the  effect  of  preventing  changes  in  our 
management. It is possible that these provisions could make it more difficult to accomplish transactions that stockholders might otherwise deem to be in 
their best interests. However, we believe that the advantages gained by protecting our ability to negotiate with any unsolicited and potentially unfriendly 
acquirer  outweigh  the  disadvantages  of  discouraging  such  proposals,  including  those  priced  above  the  then-current  market  value  of  our  common  stock, 
because, among other reasons, the negotiation of such proposals could improve their terms.

Delaware Anti-Takeover Law

We are subject to the provisions of Section 203 of the DGCL (Section 203). In general, Section 203 prohibits a publicly held Delaware corporation from 
engaging  in  a  “business  combination”  with  an  “interested  stockholder”  for  a  three-year  period  following  the  time  that  this  stockholder  becomes  an 
interested  stockholder,  unless  the  business  combination  is  approved  in  a  prescribed  manner.  A  “business  combination”  includes,  among  other  things,  a 
merger, asset or stock sale or other transaction resulting in a financial benefit to the interested stockholder. An “interested stockholder” is a person who, 
together with such person’s affiliates and associates, owns, or did own within three years prior to such determination, 15% or more of the corporation’s 

 
 
 
voting stock. Under Section 203, a business combination between a corporation and an interested stockholder is prohibited unless it satisfies one of the 
following conditions:

•

before the stockholder became interested, the board of directors of the corporation approved either the business combination or the transaction 
that resulted in the stockholder becoming an interested stockholder;

 
•

•

upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at 
least 85% of the voting stock of the corporation outstanding at the time the transaction commenced, excluding, for purposes of determining the 
voting stock outstanding, shares owned by persons who are directors and also officers, and employee stock plans, in some instances; or

at or after the time the stockholder became interested, the business combination was approved by the board of directors of the corporation and 
authorized at an annual or special meeting of the stockholders by the affirmative vote of at least two-thirds of the outstanding voting stock that is 
not owned by the interested stockholder.

Charter Documents

Our  Certificate  of  Incorporation  and  our  Bylaws  include  a  number  of  provisions  that  may  have  the  effect  of  deterring  hostile  takeovers  or  delaying  or 
preventing changes in control or management of our company. First, our Certificate of Incorporation and our Bylaws provide that all stockholder action 
must be effected at a duly called meeting of stockholders and not by a consent in writing. Further, our Bylaws limit who may call special meetings of the 
stockholders.  Our  Certificate  of  Incorporation  does  not  include  a  provision  for  cumulative  voting  for  directors.  Under  cumulative  voting,  a  minority 
stockholder holding a sufficient percentage of a class of shares may be able to ensure the election of one or more directors. Our Bylaws provide that the 
number  of  directors  on  our  board,  which  may  range  from  three  to  ten  directors,  shall  be  exclusively  fixed  by  our  board,  which  has  set  the  number  of 
directors at seven. Newly created directorships resulting from any increase in our authorized number of directors and any vacancies in our board resulting 
from death, resignation, retirement, disqualification or other cause (including removal from office by a vote of the stockholders) will be filled by a majority 
of our board then in office. Finally, our Bylaws establish procedures and other terms and conditions, including advance notice procedures, regarding special 
meeting requests by stockholders holding in the aggregate at least 25% of our outstanding common stock, nomination of candidates for election as directors 
and  stockholder  proposals.  These  and  other  provisions  of  our  Certificate  of  Incorporation,  our  Bylaws  and  Delaware  law  could  discourage  potential 
acquisition proposals and could delay or prevent a change in control or management of our company.

Our Bylaws also provide that the Court of Chancery of the State of Delaware (or if such court does not have jurisdiction, the Superior Court of Delaware, 
or  if  such  other  court  does  not  have  jurisdiction,  the  United  States  District  Court  for  the  District  of  Delaware)  will  be  the  exclusive  forum  for:  any 
derivative  action  or  proceeding  brought  on  our  behalf;  any  action  asserting  a  breach  of  fiduciary  duty;  any  action  asserting  a  claim  against  us  arising 
pursuant to the DGCL, our Certificate of Incorporation or our Bylaws; or any action asserting a claim against us that is governed by the internal affairs 
doctrine.  This  provision  will  not  apply  to  litigation  brought  to  enforce  any  liability  or  duty  created  by:  the  Securities  Act  of  1933,  as  amended;  the 
Securities Exchange Act of 1934, as amended; or the rules and regulations thereunder. The enforceability of similar choice of forum provisions in other 
companies’ organizational documents has been challenged in legal proceedings and, while the Delaware Supreme Court has upheld the validity of certain 
choice of forum provisions, it is possible that, in connection with one or more actions or proceedings described above, a court could find the choice of 
forum provisions contained in our Bylaws to be inapplicable or unenforceable.

 
 
Exhibit 10.11

EMPLOYMENT AGREEMENT

This  EMPLOYMENT  AGREEMENT  (the  “Agreement”),  is  entered  into  as  of  November  8,  2023  (the  “Execution 
Date”)  with  an  effective  date  as  of  the  first  date  of  employment  which  is  anticipated  to  be  November  8,  2023  (the  “Effective 
Date“), by and between Assembly Biosciences, Inc., a Delaware corporation with principal executive offices at 331 Oyster Point 
Blvd., South San Francisco, CA 94080 (the “Company”), and Anuj Gaggar, M.D., Ph.D. (the “Executive”).

W I T N E S S E T H:

WHEREAS, the Company desires to employ the Executive as the Chief Medical Officer as of the Effective Date, and the 

Executive desires to accept employment by the Company as of the Effective Date; and

WHEREAS,  the  parties  desire  to  enter  into  this  Agreement,  setting  forth  the  terms  and  conditions  of  the  Executive’s 

employment with the Company.

NOW,  THEREFORE,  in  consideration  of  the  mutual  covenants  and  agreements  herein  contained,  the  parties  hereto 

hereby agree as follows:

1. Employment.

(a)

Services.    The  Executive  will  be  employed  by  the  Company  initially  as  its  Chief  Medical  Officer, 
reporting  to  the  Company’s  Chief  Executive  Officer,  and  shall  perform  such  duties  as  are  consistent  with  a  position  as  Chief 
Medical Officer (the “Services”).  The Executive agrees to perform such Services faithfully, to devote Executive’s full working 
time, attention and energies to the business of the Company and, while Executive remains employed and subject to the terms of 
this  Agreement,  not  to  engage  in  any  other  business  activity  that  is  in  conflict  with  Executive’s  duties  and  obligations  to  the 
Company.  

(b) Acceptance.  The Executive hereby accepts such employment and agrees to render the Services.       

2. Term.  The Executive's employment under this Agreement shall commence as of the Effective Date and shall continue 

on an “at-will” basis until terminated pursuant to Section 7 of this Agreement (the “Term”).  

3. Best Efforts.  The  Executive  shall  devote  Executive’s  full  business  time,  attention  and  energies  to  the  business  and 
affairs of the Company and shall use Executive’s reasonable best efforts to advance the best interests of the Company and during 
the Term shall not be actively engaged in any other business activity, whether or not such business activity is pursued for gain, 
profit or other pecuniary advantage, that will interfere with the performance by the Executive of Executive’s duties hereunder or 
the Executive’s availability to perform such duties or that will adversely affect, or negatively reflect upon, the Company.

 
 
4. Compensation.  During the Term, as full compensation for the performance by the Executive of his duties under this 

Agreement, the Company shall pay the Executive as follows:

(a)

Base Salary.  The Company shall pay the Executive an initial base salary at the annualized rate of four 
hundred  ninety  thousand  dollars  ($490,000).    The  base  salary  in  effect  at  any  given  time  is  referred  to  herein  as  the  “Base 
Salary.”  Payment shall be made in accordance with the Company’s normal payroll practices, as they may be changed from time 
to  time.    The  Base  Salary  will  be  reviewed  by  the  Chief  Executive  Officer  and  the  Board  of  Directors  (the  “Board”),  or  a 
committee thereof, no less frequently than annually. 

(b) Annual Performance Bonus.  Beginning in fiscal 2024, at the sole discretion of the Board (or a committee 
thereof),  the  Executive  shall  be  eligible  to  receive  an  annual  performance-based  bonus  during  the  Term  (the  “Annual 
Performance Bonus”) targeted at forty percent (40%) of Executive’s then current Base Salary based on the attainment by the 
Company and the Executive of performance objectives as established annually by the Chief Executive Officer with approval by 
the Board (or committee thereof). Any Annual Performance Bonus earned with respect to any fiscal year shall be based on the 
attainment by the Company of the performance objectives established by the Board (or a committee thereof) for the other named 
executive officers of the Company for such fiscal year and the Executive’s individual performance objectives established by the 
Board  (or  a  committee  thereof)  upon  recommendation  of  the  Chief  Executive  Officer,  or  as  otherwise  provided  under  any 
applicable bonus plan. The Annual Performance Bonus shall be payable in a single lump-sum as determined by the Board (or a 
committee  thereof)  in  its  sole  discretion.  Except  as  otherwise  provided  in  this  Agreement,  to  earn  any  particular  Annual 
Performance Bonus, the Executive must, in addition to satisfying the performance objectives, remain employed on the date the 
Annual Performance Bonus is paid; provided, further, that the Annual Performance Bonus will be paid no later than seventy-five 
(75) days after the end of the period to which the Annual Performance Bonus pertains.

(c)

Sign-on Bonus.  The Company will pay the Executive a sign-on bonus in the gross amount of $100,000 
(the “Sign-on Bonus”), less such taxes and applicable withholdings as required by law.  The Sign-on Bonus will be payable to 
the Executive in a cash lump sum within 30 days following the Effective Date.  If, prior to the six (6) month anniversary of the 
Effective Date, (i) the Executive terminates employment with the Company other than for Good Reason (as defined in Section 
7(d)) or death or Disability (as defined in Section 7(b)) or (ii) the Company terminates the Executive for Cause (as defined in 
Section 7(a)), then the Executive will promptly repay to the Company 100% of the net amount of the Sign-On Bonus.  If, on or 
after the six-month anniversary of the Effective Date and prior to the one-year anniversary of the Effective Date, the Executive 
terminates  employment  with  the  Company  other  than  for  Good  Reason  or  death  or  Disability  or  the  Company  terminates 
Executive for Cause, then the Executive will promptly repay to the Company 66-2/3% of the net amount of the Sign-On Bonus.  
If, on or after the one-year anniversary of the Effective Date and prior to the eighteen (18) month anniversary of the Effective 
Date, the Executive terminates employment with the Company other than for Good Reason or death or Disability or the Company 
terminates Executive for Cause, then the Executive will promptly repay to the Company 33-1/3% of the net amount of the Sign-
On Bonus. If the Executive is obligated under this Section 4(c) to repay to the Company the Sign-on Bonus, then the Company 
may, in its discretion and as permitted under applicable law, off-set all or part of the Executive’s obligation under this Section 4(c) 
against amounts otherwise due to the Executive from the Company.

2

 
(d) Withholding.  Amounts payable to the Executive under this Agreement, including Section 4 and Section 
8,  shall  be  net  of  all  applicable  federal,  state  and  local  taxes,  social  security  and  such  other  amounts  as  the  Company  may  be 
required by law to withhold from such amounts.

(e)

Equity.    As  a  material  inducement  to  accept  the  Company’s  offer  of  employment,  the  Company  will 
recommend  to  the  Board  (or  a  committee  thereof)  that  the  Executive  be  granted,  subject  to  the  Executive’s  acceptance  of  this 
Agreement  and  commencement  of  employment,  an  option  to  purchase  500,000  shares  of  common  stock  of  the  Company  (the 
“New Hire Stock Option”).  As an inducement that is material to the Executive’s employment with the Company, a portion of 
the New Hire Equity Awards will be granted to the Executive under each of (i) the Company’s 2017 Inducement Award Plan (the 
“2017  Inducement  Plan”),  (ii)  the  Company’s  2020  Inducement  Award  Plan  (the  “2020  Inducement  Plan”)  and  (iii)  the 
Company’s Amended and Restated 2014 Stock Incentive Plan (the “2014 Plan” and, together with the 2017 Inducement Plan and 
the 2020 Inducement Plan, the “Plans”). The grants to be made under the 2017 Inducement Plan and the 2020 Inducement Plan 
will be made pursuant to the inducement grant exception under Nasdaq Rule 5635(c)(4).  The New Hire Stock Option will have 
the following terms:

(i) Subject  to  the  Executive’s  continued  employment  and  the  terms  of  the  Company’s  Plans  and  the 
applicable non-qualified stock option agreement entered into by the Executive and the Company pursuant to the Plans, the New 
Hire Stock Option will be granted as of the grant date, will have a term of ten years and the shares underlying the New Hire Stock 
Option shall vest in installments over four years with the first installment (representing approximately 25% of the shares) vesting 
on  the  first  anniversary  of  the  grant  date  and  the  balance  vesting  over  the  next  three  years  thereafter  in  approximately  equal 
monthly installments. The New Hire Stock Option will have an exercise price equal to the closing price of a common share of the 
Company  on  the  Nasdaq  Global  Select  Market  on  the  grant  date.    The  New  Hire  Stock  Option  shall  be  subject  to  accelerated 
vesting of time-based vesting awards in connection with a termination of employment to the extent and as provided in Section 
8(b)  of  this  Agreement.  The  New  Hire  Stock  Option  and  any  subsequently  granted  equity  or  stock-based  awards  under  the 
Company’s equity incentive plans, including stock options and restricted stock unit awards, will be collectively referred to in this 
Agreement as the “Equity Awards.”  

(f)

Expenses.  The Company shall provide the Executive with a corporate credit card for business use, and 
shall  reimburse  the  Executive  for  all  normal,  usual  and  necessary  expenses  incurred  by  the  Executive  in  furtherance  of  the 
business  and  affairs  of  the  Company,  including  reasonable  travel  and  entertainment,  upon  timely  receipt  by  the  Company  of 
appropriate  vouchers  or  other  proof  of  the  Executive’s  expenditures  and  otherwise  in  accordance  with  any  expense 
reimbursement policy as may from time to time be adopted by the Company.

(g) Other Benefits.    The  Executive  shall  be  entitled  to  all  rights  and  benefits  for  which  Executive  shall  be 
eligible  under  any  benefit  or  other  plans  (including,  without  limitation,  dental,  medical,  medical  reimbursement  and  hospital 
plans, pension plans, employee stock purchase plans, profit sharing plans, bonus plans and other so-called “Fringe Benefits”) as 
the Company shall make available to its senior executives from time to time, subject to the terms of such plans.  In addition, if 
applicable, the Company shall reimburse the Executive for Executive’s 

3

 
reasonable licensing fees, continuing professional education, and other professional dues upon timely receipt by the Company of 
appropriate  vouchers  or  other  proof  of  the  Executive’s  expenditures  and  otherwise  in  accordance  with  any  expense 
reimbursement policy as may from time to time be adopted by the Company.  The Company shall also name the Executive as a 
covered person under its Directors & Officers insurance policies.  

policy, as in effect from time to time.

(h) Vacation.    The  Executive  will  be  entitled  to  paid  vacation  in  accordance  with  the  Company’s  vacation 

5. Confidential Information and Inventions.  The Executive agrees to execute and comply with the Company’s standard 

form of Proprietary Information and Inventions Agreement, as it may be amended from time to time (the “PIIA”).

6. Representations and Warranties.  

(a)

The Executive hereby represents and warrants to the Company as follows:

(i) Neither  the  execution  or  delivery  of  this  Agreement  nor  the  performance  by  the  Executive  of 
Executive’s duties and other obligations hereunder violate or will violate any statute, law, determination or award, or conflict with 
or constitute a default or breach of any covenant or obligation under (whether immediately, upon the giving of notice or lapse of 
time or both) any prior employment agreement, contract, or other instrument to which the Executive is a party or by which he is 
bound.

(ii) The Executive has the full right, power and legal capacity to enter and deliver this Agreement and to 
perform Executive’s duties and other obligations hereunder.  This Agreement constitutes the legal, valid and binding obligation of 
the  Executive  enforceable  against  him  in  accordance  with  its  terms.    No  approvals  or  consents  of  any  persons  or  entities  are 
required for the Executive to execute and deliver this Agreement or perform Executive’s duties and other obligations hereunder.

The Company hereby represents and warrants to the Executive that this Agreement and the employment 
of  the  Executive  hereunder  have  been  duly  authorized  by  and  on  behalf  of  the  Company,  including,  without  limitation,  by  all 
required action by the Board.

(b)

7. Termination.    The  Executive’s  employment  hereunder  shall  be  terminated  immediately  upon  the  Executive’s  death 

and may be otherwise terminated as follows:

the Chief Executive Officer.  Any of the following actions by the Executive shall constitute “Cause”:

(a)

The Executive’s employment hereunder may be terminated by the Company for Cause as determined by 

hereunder;

(i) The  willful  failure  or  disregard  or  continuing  refusal  by  the  Executive  to  perform  his  duties 

(ii) Any act of willful or intentional misconduct, or a grossly negligent act by the Executive having the 
effect of injuring, in a material way (as determined in good-faith by the Company), the business or reputation of the Company, 
including but not limited to, any officer, director, or executive of the Company; 

4

 
(iii)Willful misconduct by the Executive in carrying out his duties or obligations under this Agreement, 
including,  without  limitation,  insubordination  with  respect  to  lawful  directions  received  by  the  Executive  from  the  Chief 
Executive Officer or from the Board having the effect of injuring, in a material way (as determined in good-faith by the Chief 
Executive Officer), the business or reputation of the Company;

entry of a nolo contendere plea);

(iv)The  Executive’s  indictment  of  any  felony  or  a  misdemeanor  involving  moral  turpitude  (including 

(v) The determination by the Company, based upon clear and convincing evidence, after a reasonable 
and  good-faith  investigation  by  the  Company  following  a  written  allegation  by  another  employee  of  the  Company,  that  the 
Executive  engaged  in  some  form  of  harassment  or  discrimination  prohibited  by  law  (including,  without  limitation,  age,  sex  or 
race discrimination);

assets (whether or not a misdemeanor or felony);

(vi)Any intentional misappropriation of the property of the Company, or embezzlement of its funds or 

(vii)Breach by the Executive of any of the provisions of the PIIA; and

(viii)Breach  by  the  Executive  of  any  provision  of  this  Agreement  other  than  those  contained  in  the 
PIIA, which is not cured by the Executive within thirty (30) business days after notice thereof is given to the Executive by the 
Company.

Except for a failure, misconduct, breach, or refusal which, by its nature, cannot reasonably be expected to be cured, the Executive 
shall have ten (10) business days from the delivery of written notice by the Company within which to cure any acts constituting 
Cause,  unless  a  longer  cure  period  is  provided  in  the  act  constituting  Cause  described  above;  provided  however,  that,  if  the 
Company  reasonably  expects  irreparable  injury  from  a  delay  of  ten  (10)  business  days,  the  Company  may  give  the  Executive 
notice of such shorter period within which to cure as is reasonable under the circumstances, which may include the termination of 
the Executive's employment for Cause without notice and with immediate effect.

(b)

The  Executive’s  employment  hereunder  may  be  terminated  by  the  Chief  Executive  Officer  due  to  the 
Executive’s Disability.  For purposes of this Agreement, a termination for  “Disability” shall occur (i) when the Chief Executive 
Officer has provided a written termination notice to the Executive supported by a written statement from a reputable independent 
physician  mutually  selected  by  the  Company  and  the  Executive,  or  the  Executive’s  legal  representatives  in  the  event  the 
Executive is unable to make such selection due to mental incapacity (“Independent Physician”), to the effect that the Executive 
shall have become so physically or mentally incapacitated as to be unable to resume, even with reasonable accommodation as 
may be required under the Americans With Disabilities Act, within the ensuing twelve (12) months, the Executive’s employment 
hereunder by reason of physical or mental illness or injury, or (ii) upon rendering of a written termination notice by the Company 
after the Executive has been unable to substantially perform his duties hereunder, even with reasonable accommodation as may 
be required under the Americans With Disabilities Act, for one hundred twenty (120) or more consecutive days, or more than one 
hundred eighty (180) days in any consecutive twelve (12) 

5

 
month period, by reason of any physical or mental illness or injury.  For purposes of this Section 7(b), the Executive agrees to 
make himself available and to cooperate in any reasonable examination by an Independent Physician paid for by the Company.  
Notwithstanding the foregoing, nothing herein shall give the Company the right to terminate the Executive prior to discharging its 
obligations to the Executive, if any, under the Family and Medical Leave Act, the Americans With Disabilities Act, or any other 
applicable law.  The Company shall reimburse the Executive for the Executive’s actual cost of maintaining a supplementary long-
term disability insurance policy during the Term up to a maximum reimbursement of $10,000 per year.  

(c)

The Executive’s employment hereunder may be terminated by the Company (or its successor) by written 
notice  to  the  Executive  upon  the  occurrence  of  a  Change  of  Control.    For  purposes  of  this  Agreement,  “Change  of  Control” 
means (i) the acquisition, directly or indirectly, following the Effective Date by any person (as such term is defined in Section 
13(d) and 14(d)(2) of the Securities Exchange Act of 1934, as amended), in one transaction or a series of related transactions, of 
securities of the Company representing in excess of fifty percent (50%) of the combined voting power of the Company’s then 
outstanding securities if such person or his or its affiliate(s) do not own in excess of fifty percent (50%) of such voting power on 
the Effective Date of this Agreement, (ii) the future disposition by the Company (whether direct or indirect, by sale of assets or 
stock, merger, consolidation or otherwise) of all or substantially all of its business and/or assets in one transaction or series of 
related transactions other than a merger  effected exclusively for the purpose of changing the domicile of the Company, or (iii) a 
“corporate  transaction”  as  defined  in  the  Company  equity  incentive  plans  under  which  the  Executive  has  been  granted  Equity 
Awards.  Notwithstanding  the  foregoing,  if  the  Change  of  Control  does  not  constitute  a  change  in  the  ownership  or  effective 
control of the Company, or in the ownership of a substantial portion of the assets of the Company, within the meaning of Section 
409A of the Internal Revenue Code of 1986, as amended (the “Code”), the amount of cash severance payable pursuant to Section 
8(b), if any, shall be paid in equal installments in accordance with the Company’s then payroll practice over  a 12-month period.  
Solely  for  purposes  of  Section  409A  of  the  Code,  each  installment  payment  under  this  Agreement  is  considered  a  separate 
payment.  

(d)

The Executive’s employment hereunder may be voluntarily terminated by the Executive for Good Reason.  
For purposes of this Agreement, “Good Reason” shall mean any of the following:  (i) any material reduction by the Company of 
the  Executive’s  duties,  or    responsibilities  or  authority  that,  taken  as  a  whole,  results  in  a  material  diminution  of  position; 
provided, however, that a change in the Executive’s title or reporting relationship shall not by itself constitute a termination by the 
Executive  for  Good  Reason  under  this  clause  (i);  (ii)  any  material  (meaning  10%  or  more)  reduction  by  the  Company  of  the 
Executive’s  Base  Salary  and/or  target  Annual  Performance  Bonus  payable  hereunder  (it  being  understood  that  an  across-the-
board reduction applicable to all similarly situated employees of the Company, including the Executive, shall not be deemed a 
reduction for purposes of this definition); (iii) in connection with a Change of Control or within the COC Period (as defined in 
Section 8(b) below), a material adverse change in the reporting structure or title applicable to the Executive, including an adverse 
change arising from a material diminution in the authority, duties or responsibilities of the supervisor to whom the Executive is
required to report (e.g., the Executive no longer reports to the Chief Executive Officer of the Company or its successor); (iv) any 
requirement by the Company, without the Executive’s prior written consent, that the Executive locate the Executive’s residence or 
primary place of employment to a location outside a 50-mile radius of such location mutually agreed upon 

6

 
between the Company and the Executive as of the Effective Date, or such other location that the Company and the Executive may 
mutually agree upon and designate from time to time during the Term;  or (v) a material breach by the Company of Section 6(b) 
of this Agreement which is not cured by the Company within thirty (30) days after written notice thereof is given to the Company 
by the Executive.  However, notwithstanding the above, Good Reason shall not exist unless: (x) the Executive notifies in writing 
the Chief Executive Officer within thirty (30) days of the initial existence of one of the adverse events described above, and (y) 
the Company fails to correct the adverse event within thirty (30) days of such written notice, and (z) the Executive’s voluntary 
termination because of the existence of one or more of the adverse events described above occurs within ninety (90) days of the 
initial existence of the event.  

The Executive’s employment may be terminated by the Company without Cause by delivery of written 
notice to the Executive effective the date of delivery of such notice.  For the avoidance of doubt, termination of the Executive’s 
employment due to his death or Disability does not constitute a termination for Cause.

(e)

delivery of written notice to the Company effective fifteen (15) days after the date of delivery of such notice.

(f)

The  Executive’s  employment  may  be  terminated  by  the  Executive  in  the  absence  of  Good  Reason  by 

8. Compensation upon Termination.

(a) Accrued  Benefits.    Upon  termination  of  the  Executive’s  employment  by  either  party  regardless  of  the 
cause or reason, the Executive shall be entitled to the following, referred to herein as the “Accrued Benefits”:  (i) payment for 
any accrued, unpaid Base Salary through the termination date; (ii) if provided for under the Company’s vacation plan or policy or 
required by applicable law, payment for any accrued, unused vacation days through the termination date; and (iii) reimbursement 
for  any  approved  business  expenses  that  the  Executive  has  timely  submitted  for  reimbursement  in  accordance  with  the 
Company’s business expense reimbursement policy or practice.   Except as otherwise expressly provided by this Agreement, the 
Company  shall  have  no  further  payment  obligations  to  the  Executive  and  all  Equity  Awards  that  have  not  vested  as  of  the 
termination  date  shall  be  forfeited  to  the  Company  as  of  such  date.    Subject  to  this  Section  8,  the  vested  portion  of  any  stock 
options held by the Executive as of the Executive’s termination date shall remain exercisable for ninety (90) days following such 
termination.  

(b) Change  of  Control  Separation  Benefits.    If  the  Executive’s  employment  is  terminated  by  the 
Company due to Disability pursuant to Section 7(b), by the Company without Cause pursuant to Section 7(e) or by the Executive 
for Good Reason pursuant to Section 7(d) and such termination occurs during the period beginning on the Change of Control and 
ending  twelve  (12)  months  immediately  following  such  Change  of  Control  (the  “COC  Period”),  provided  that  the  Executive 
signs and does not revoke a general release of claims against the Company within the time period specified therein (which time 
period shall not exceed sixty (60) days), in form and substance satisfactory to the Company (the “Release”), then the Company 
shall provide the following benefits to the Executive, referred to herein as the “Change of Control Separation Benefits”:  (i) a 
lump  sum  payment  equal  to  twelve  (12)  months  of  the  Executive’s  then-current  Base  Salary;  (ii)  the  full  target  Annual 
Performance Bonus for the year in which such termination occurs, less any installments paid in advance (items (i) and (ii) being 
the “Change of 

7

 
Control Separation Pay”); (iii) immediate vesting in full of all Equity Awards with time based vesting; and (iv) if the Executive 
properly and timely elects to continue his health insurance benefits under COBRA or applicable state continuation coverage after 
the  termination  date,  reimbursement  for  the  portion  of  Executive’s  health  continuation  coverage  premiums  that  the  Company 
would have paid had the Executive remained employed by the Company until the earlier of (A) the twelve (12) months following 
the month in which the Executive’s termination date occurs, or (B) the maximum period permitted by applicable law, provided 
that  the  Company’s  obligation  to  pay  a  portion  of  the  Executive’s  health  continuation  coverage  premiums  will  terminate  if 
Executive becomes eligible for health insurance benefits from another employer during the reimbursement period.  Subject to the 
Release  being  effective,  the  Change  of  Control  Separation  Pay  will  be  paid  within  sixty  (60)  days  after  the  termination  date; 
provided, however, that if the 60-day period begins in one calendar year and ends in a second calendar year, such payments, to the 
extent they qualify as “non-qualified deferred compensation” within the meaning of Section 409A of the Code, shall be paid no 
earlier than the first Company payroll date in the second calendar year and, in any case, by the last day of such 60-day period.

(c)

Base Separation Benefits.  If the Executive’s employment is terminated during the Term and outside of the 
COC Period as a result of the Executive’s Disability pursuant to Section 7(b), by the Company without Cause pursuant to Section 
7(e), or by the Executive for Good Reason pursuant to Section 7(d), provided that the Executive signs and does not revoke the 
Release within the time period specified therein (which time period shall not exceed sixty (60) days), then the Company shall 
provide the following benefits to the Executive, referred to herein as the “Base Separation Benefits”:  (i) the continued payment 
in installments of the Executive’s then-current Base Salary for a period of twelve (12) months following the termination date (the 
“Base Separation Pay”); and (ii) if the Executive properly and timely elects to continue Executive’s health insurance benefits 
under  COBRA  or  applicable  state  continuation  coverage  after  the  termination  date,  reimbursement  for  the  portion  of  the 
Executive’s health continuation coverage premiums that the Company would have paid had the Executive remained employed by 
the  Company  until  the  earlier  of  (A)  the  twelve  (12)  months  following  the  month  in  which  the  Executive’s  termination  date 
occurs, or (B) the maximum period permitted by applicable law, provided that the Company’s obligation to pay a portion of the 
Executive’s  health  continuation  coverage  premiums  will  terminate  if  he  becomes  eligible  for  health  insurance  benefits  from 
another  employer  during  the  reimbursement  period.    The  first  installment  of  the  Base  Separation  Pay  will  be  paid  on  the 
Company’s first regular payday occurring following the effectiveness of the Release in an amount equal to the sum of payments 
of  Base  Salary  that  would  have  been  paid  if  Executive  had  remained  in  employment  for  the  period  from  the  termination  date 
through the payment date.  The remaining installments will be paid until the end of the 12-month period at the same rate as the 
Base Salary in accordance with the Company’s normal payroll practices for its employees. Notwithstanding the foregoing, if the 
60-day period for the execution and non-revocation of the Release begins in one calendar year and ends in a second calendar year, 
the Base Separation Pay, to the extent it qualifies as “non-qualified deferred compensation” within the meaning of Section 409A 
of the Code, shall begin to be paid no earlier than the first Company payroll date in the second calendar year and, in any case, by 
the last day of such 60-day period; provided, however, that the initial payment shall include a catch-up payment to cover amounts 
retroactive to the day immediately following the termination date.  The Executive understands that if the Executive is eligible to 
receive  the  Base  Separation  Benefits,  such  Base  Separation  Benefits  shall  be  in  lieu  of  and  not  in  addition  to  the  Change  of 
Control Separation Benefits described in Section 8(b) of this 

8

 
Agreement.  Notwithstanding the foregoing, if the Executive is entitled to receive the Base Separation Benefits but violates any 
provisions of this Agreement, the PIIA or any other agreement entered into by the Executive and the Company after termination 
of  employment,  the  Company  will  be  entitled  to  immediately  stop  paying  any  further  installments  of  the  Base  Separation 
Benefits.  

(d)

This  Section  8  sets  forth  the  only  obligations  of  the  Company  with  respect  to  the  termination  of  the 
Executive’s employment with the Company, except as otherwise required by law, and the Executive acknowledges that, upon the 
termination  of  the  Executive’s  employment,  the  Executive  shall  not  be  entitled  to  any  payments  or  benefits  which  are  not 
explicitly provided in Section 8.  

(e) Upon  termination  of  the  Executive’s  employment  hereunder  for  any  reason,  the  Executive  shall  be 
deemed to have resigned as director and/or officer of the Company and each subsidiary of the Company, to the extent applicable, 
effective as of the date of such termination, unless otherwise requested by the Board.

(f)

The provisions of this Section 8 shall survive any termination of this Agreement.

9. Section 409A.  The intent of the parties to this Agreement is that the payments, compensation and benefits under this 
Agreement be exempt from or comply with Section 409A of the Code and the regulations and guidance promulgated thereunder 
(collectively, “Section 409A”) and, in this connection, the following shall be applicable:

(a)
with Section 409A.  

To the greatest extent possible, this Agreement shall be interpreted to be exempt from or in compliance 

If  any  severance,  compensation,  or  benefit  required  by  this  Agreement  is  to  be  paid  in  a  series  of 
installment payments, each individual payment in the series shall be considered a separate payment for purposes of Section 409A.

(b)

(c)

If  any  severance,  compensation,  or  benefit  required  by  this  Agreement  that  constitutes  “nonqualified 
deferred compensation” within the meaning of Section 409A is considered to be paid on account of “separation from service” 
within  the  meaning  of  Section  409A,  and  the  Executive  is  a  “specified  employee”  within  the  meaning  of  Section  409A,  no 
payments of any of such severance, compensation, or benefit shall be made until the earlier of six (6) months plus one (1) day 
after  such  separation  from  service  or  the  Executive’s  death  (the  “New  Payment  Date”).    The  aggregate  amount  of  any  such 
payments  that  would  have  otherwise  been  paid  during  the  period  between  the  date  of  separation  from  service  and  the  New 
Payment Date shall be paid to the Executive or his estate in a lump sum payment on the New Payment Date.  Thereafter, any 
severance, compensation, or benefit required by this Agreement that remains outstanding as of the day immediately following the 
New Payment Date shall be paid without delay over the time period originally scheduled, in accordance with the terms of this 
Agreement.

9

 
(d)

To the extent that any payment or benefit described in this Agreement constitutes “non-qualified deferred 
compensation” under Section 409A of the Code, and to the extent that such payment or benefit is payable upon the Executive’s 
termination of employment, then such payments or benefits shall be payable only upon the Executive’s “separation from service.”  
The  determination  of  whether  and  when  a  separation  from  service  has  occurred  shall  be  made  in  accordance  with  the 
presumptions set forth in Treasury Regulation Section 1.409A 1(h).

The  Company  makes  no  representation  or  warranty  and  shall  have  no  liability  to  the  Executive  or  any 
other person if any provisions of this Agreement are determined to constitute deferred compensation subject to Section 409A of 
the Code but do not satisfy an exemption from, or the conditions of, such Section.

(e)

(f)

The provisions of this Section 9 shall survive any termination of this Agreement.

10.Section 280G.

(a) Notwithstanding any other provision of this Agreement or any other plan, arrangement or agreement to 
the contrary, if any of the payments or benefits provided or to be provided by the Company or its affiliates to the Executive or for 
the  Executive’s  benefit  pursuant  to  the  terms  of  this  Agreement  or  otherwise  (“Covered  Payments”)  constitute  parachute 
payments  (“Parachute  Payments”)  within  the  meaning  of  Section  280G  of  the  Code  and  would,  but  for  this  Section  10  be 
subject to the excise tax imposed under Section 4999 of the Code (or any successor provision thereto) or any similar tax imposed 
by state or local law or any interest or penalties with respect to such taxes (collectively, the “Excise Tax”), then prior to making 
the  Covered  Payments,  a  calculation  shall  be  made  comparing  (i)  the  Net  Benefit  (as  defined  below)  to  the  Executive  of  the 
Covered Payments after payment of the Excise Tax to (ii) the Net Benefit to the Executive if the Covered Payments are limited to 
the  extent  necessary  to  avoid  being  subject  to  the  Excise  Tax.  Only  if  the  amount  calculated  under  (i)  above  is  less  than  the 
amount under (ii) above will the Covered Payments be reduced to the minimum extent necessary to ensure that no portion of the 
Covered  Payments  is  subject  to  the  Excise  Tax  (that  amount,  the  “Reduced Amount”).  “Net  Benefit”  shall  mean  the  present 
value of the Covered Payments net of all federal, state, local, foreign income, employment and excise taxes.

(b) Any such reduction shall be made in accordance with Section 409A of the Code and the following:  (i) the 
Covered  Payments  which  do  not  constitute  nonqualified  deferred  compensation  subject  to  Section  409A  of  the  Code  shall  be 
reduced first; and (ii) all other Covered Payments shall then be reduced as follows: (A) cash payments shall be reduced before 
non-cash payments; and (B) payments to be made on a later payment date shall be reduced before payments to be made on an 
earlier payment date.

(c) Any determination required under this Section 10 shall be made in writing in good faith by the accounting 
firm  that  was  the  Company’s  independent  auditor  immediately  before  the  Change  of  Control  (the  “Accounting  Firm”).    The
Accounting Firm shall provide detailed supporting calculations to the Company and the Executive as requested by the Company 
or the Executive. The Company and the Executive shall provide the Accounting Firm with such information and documents as 
the Accounting Firm may reasonably request in order to make a 

10

 
determination under this Section 10.  For purposes of making the calculations and determinations required by this Section 10, the 
Accounting Firm may rely on reasonable, good faith assumptions and approximations concerning the application of Section 280G 
and  Section  4999  of  the  Code.  The  Accounting  Firm’s  determinations  shall  be  final  and  binding  on  the  Company  and  the 
Executive. The Company shall be responsible for all fees and expenses incurred by the Accounting Firm in connection with the 
calculations required by this Section 10.

It is possible that after the determinations and selections made pursuant to this Section 10 the Executive 
will receive Covered Payments that are in the aggregate more than the amount provided under this Section 10 (“Overpayment”) 
or less than the amount provided under this Section 10 (“Underpayment”). 

(d)

(i) In the event that: (A) the Accounting Firm determines, based upon the assertion of a deficiency by 
the  Internal  Revenue  Service  against  either  the  Company  or  the  Executive  which  the  Accounting  Firm  believes  has  a  high 
probability of success, that an Overpayment has been made or (B) it is established pursuant to a final determination of a court or 
an Internal Revenue Service proceeding that has been finally and conclusively resolved that an Overpayment has been made, then 
the Executive shall pay any such Overpayment to the Company.

(ii) In  the  event  that:  (A)  the  Accounting  Firm,  based  upon  controlling  precedent  or  substantial 
authority,  determine  that  an  Underpayment  has  occurred  or  (B)  a  court  of  competent  jurisdiction  determines  that  an 
Underpayment  has  occurred,  any  such  Underpayment  will  be  paid  promptly  by  the  Company  to  or  for  the  benefit  of  the 
Executive.

11.Miscellaneous.

State of California, without giving effect to its principles of conflicts of laws.

(a)

This Agreement shall be governed by, and construed and interpreted in accordance with, the laws of the 

(b)

In the event of any dispute arising out of, or relating to, this Agreement or the breach thereof, or regarding 
the interpretation thereof, the parties agree to submit any differences to nonbinding mediation prior to pursuing resolution through 
the  courts.    The  parties  hereby  submit  to  the  exclusive  jurisdiction  of  the  state  and  federal  courts  situated  in  San  Francisco 
County, California, and agree that service of process in such court proceedings shall be satisfactorily made upon each other if sent 
by registered mail addressed to the recipient at the address referred to in Section 11(g) below. 

heirs, legal representatives, successors and permitted assigns.

(c)

This Agreement shall be binding upon and inure to the benefit of the parties hereto, and their respective 

(d)

This  Agreement,  and  the  Executive’s  rights  and  obligations  hereunder,  may  not  be  assigned  by  the 
Executive.  The rights and obligations of the Company under this Agreement shall inure to the benefit of and shall be binding 
upon  the  successors  and  assigns  of  the  Company,  including  any  successors  or  assigns  in  connection  with  any  sale,  transfer  or 
other disposition of all or substantially all of its business or assets.

11

 
(e)
agreement signed by the parties hereto.

This Agreement cannot be amended orally, or by any course of conduct or dealing, but only by a written 

(f)

The  failure  of  either  party  to  insist  upon  the  strict  performance  of  any  of  the  terms,  conditions  and 
provisions  of  this  Agreement  shall  not  be  construed  as  a  waiver  or  relinquishment  of  future  compliance  therewith,  and  such 
terms, conditions and provisions shall remain in full force and effect.  No waiver of any term or condition of this Agreement on 
the part of either party shall be effective for any purpose whatsoever unless such waiver is in writing and signed by such party.

(g) All  notices,  requests,  consents  and  other  communications,  required  or  permitted  to  be  given  hereunder, 
shall  be  in  writing  and  shall  be  delivered  personally  or  by  an  overnight  courier  service  or  sent  by  registered  or  certified  mail, 
postage prepaid, return receipt requested, to the Executive at the last address of record in his personnel file and to the Company at 
the address for its corporate headquarters, and shall be deemed given when so delivered personally or by overnight courier, or, if 
mailed, five days after the date of deposit in the United States mail.  Either party may designate another address, for receipt of 
notices hereunder by giving notice to the other party in accordance with this Section 11(g).

(h)

This  Agreement  sets  forth  the  entire  agreement  and  understanding  of  the  parties  relating  to  the  subject 
matter  hereof,  and  supersedes  all  prior  agreements,  arrangements  and  understandings,  written  or  oral,  relating  to  the  subject 
matter hereof.  No representation, promise or inducement has been made by either party that is not embodied in this Agreement, 
and neither party shall be bound by or liable for any alleged representation, promise or inducement not so set forth.

entity controlling, controlled by or under common control with the specified person or entity.

(i)

As used in this Agreement, “affiliate” of a specified person or entity shall mean and include any person or 

meaning or interpretation of this Agreement.

(j)

The section headings contained herein are for reference purposes only and shall not in any way affect the 

(k)

This Agreement may be executed in one or more counterparts, each of which shall be deemed an original 
and  all  of  which  together  shall  constitute  one  and  the  same  original,  binding  document.  Any  facsimile,  PDF  reproduction  of 
original signatures or other electronic transmission of a signed counterpart shall be deemed to be an original counterpart and any 
signature appearing thereon shall be deemed to be an original signature.  Each party agrees that the electronic signatures of the 
parties included in this Agreement, including via DocuSign®, are intended to authenticate this writing and to have the same force 
and effect as manual signatures.

[Remainder of Page Intentionally Left Blank – Signature Page Follows]

12

 
 
IN  WITNESS  WHEREOF,  the  parties  hereto  have  executed  this  Agreement  and  intend  it  to  be  effective  as  of  the 

Effective Date by proper person thereunto duly authorized.

ASSEMBLY BIOSCIENCES, INC.

By:
Name:
Title:

/s/ Jason A. Okazaki
Jason A. Okazaki
Chief Executive Officer and President

EXECUTIVE

/s/Anuj Gaggar, M.D., Ph.D.
Name: Anuj Gaggar, M.D., Ph.D.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 10.12

EMPLOYMENT AGREEMENT

This  EMPLOYMENT  AGREEMENT  (the  “Agreement”),  is  entered  into  as  of  February  1,  2022  (the  “Execution 
Date”) with an effective date February 10, 2022 (the “Effective Date“), by and between Assembly Biosciences, Inc., a Delaware 
corporation  with  principal  executive  offices  at  331  Oyster  Point  Blvd.,  Fourth  Floor,  South  San  Francisco,  CA  94080  (the 
“Company”), and Nicole S. White, Ph.D. (the “Employee”).

W I T N E S S E T H:

WHEREAS, the Company desires to promote the Employee to Chief Manufacturing Officer as of the Effective Date, and 

the Employee desires to accept this promotion as of the Effective Date; and

WHEREAS,  the  parties  desire  to  enter  into  this  Agreement,  setting  forth  the  terms  and  conditions  of  the  Employee’s 

employment with the Company;

NOW,  THEREFORE,  in  consideration  of  the  mutual  covenants  and  agreements  herein  contained,  the  parties  hereto 

hereby agree as follows:

1. Employment.

(a)

Services.  The Employee will be employed by the Company as its Chief Manufacturing Officer, reporting 
to the Company’s Chief Executive Officer, and shall perform such duties as are consistent with a position as Chief Manufacturing 
Officer  (the  “Services”).    The  Employee  agrees  to  perform  such  Services  faithfully,  to  devote  Employee’s  full  working  time, 
attention and energies to the business of the Company and, while Employee remains employed and subject to the terms of this 
Agreement,  not  to  engage  in  any  other  business  activity  that  is  in  conflict  with  Employee’s  duties  and  obligations  to  the 
Company.  

(b) Acceptance.  The Employee hereby accepts such employment and agrees to render the Services.       

2. Term.    The  Employee's  employment  under  this  Agreement  shall  commence  as  of  the  Effective  Date  and  shall 

continue on an “at-will” basis until terminated pursuant to Section 7 of this Agreement (the “Term”).  

3. Best Efforts.  The  Employee  shall  devote  Employee’s  full  business  time,  attention  and  energies  to  the  business  and 
affairs of the Company and shall use Employee’s reasonable best efforts to advance the best interests of the Company and during 
the Term shall not be actively engaged in any other business activity, whether or not such business activity is pursued for gain, 
profit or other pecuniary advantage, that will interfere with the performance by the Employee of Employee’s duties hereunder or 
the Employee’s availability to perform such duties or that will adversely affect, or negatively reflect upon, the Company.

 
4. Compensation.  During the Term, as full compensation for the performance by the Employee of his duties under this 

Agreement, the Company shall pay the Employee as follows:

(a)

Base Salary.  The Company shall pay the Employee a base salary at the annualized rate of four hundred 
thousand dollars ($400,000).  The base salary in effect at any given time is referred to herein as the “Base Salary.”    Payment 
shall be made in accordance with the Company’s normal payroll practices, as they may be changed from time to time.  The Base 
Salary will be reviewed by the Chief Executive Officer and the Board of Directors (the “Board”), or a committee thereof, no less 
frequently than annually. 

(b) Annual Performance Bonus.  At the sole discretion of the Board (or a committee thereof), the Employee 
shall be eligible to receive an annual performance-based bonus during the Term (the “Annual Performance Bonus”) targeted at 
forty percent (40%) of Employee’s then current Base Salary based on the attainment by the Employee of performance objectives 
as established annually by the Chief Executive Officer. The Annual Performance Bonus shall be payable in a single lump-sum as 
determined by the Board (or a committee thereof) in its sole discretion. Except as otherwise provided in this Agreement, to earn 
any  particular  Annual  Performance  Bonus,  the  Employee  must,  in  addition  to  satisfying  the  performance  objectives,  remain 
employed on the date the Annual Performance Bonus is paid; provided, further, that the Annual Performance Bonus will be paid 
no later than seventy-five (75) days after the end of the period to which the Annual Performance Bonus pertains.

(c) Withholding.  Amounts payable to the Employee under this Agreement, including Section4 and Section 8, 
shall  be  net  of  all  applicable  federal,  state  and  local  taxes,  social  security  and  such  other  amounts  as  the  Company  may  be 
required by law to withhold from such amounts.

Equity.  From time to time, subject to and upon the approval by the Board (or a committee thereof), the 
Company may grant to the Employee equity awards to purchase or receive shares of common stock of the Company (the “Equity
Awards”). The Equity Awards will contain such terms and conditions as may be approved by the Board (or a committee thereof). 

(d)

(e)

Expenses.  The Company shall provide the Employee with a corporate credit card for business use, and 
shall  reimburse  the  Employee  for  all  normal,  usual  and  necessary  expenses  incurred  by  the  Employee  in  furtherance  of  the 
business  and  affairs  of  the  Company,  including  reasonable  travel  and  entertainment,  upon  timely  receipt  by  the  Company  of 
appropriate  vouchers  or  other  proof  of  the  Employee’s  expenditures  and  otherwise  in  accordance  with  any  expense 
reimbursement policy as may from time to time be adopted by the Company.

(f)

Other Benefits.    The  Employee  shall  be  entitled  to  all  rights  and  benefits  for  which  Employee  shall  be 
eligible  under  any  benefit  or  other  plans  (including,  without  limitation,  dental,  medical,  medical  reimbursement  and  hospital 
plans, pension plans, employee stock purchase plans, profit sharing plans, bonus plans and other so-called “Fringe Benefits”) as 
the Company shall make available to its senior executives from time to time, subject to the terms of such plans.  In addition, if 
applicable,  the  Company  shall  reimburse  the  Employee  for  Employee’s  reasonable  licensing  fees,  continuing  professional 
education,  and  other  professional  dues  upon  timely  receipt  by  the  Company  of  appropriate  vouchers  or  other  proof  of  the 
Employee’s 

2

 
expenditures and otherwise in accordance with any expense reimbursement policy as may from time to time be adopted by the 
Company.  The Company shall also name the Employee as a covered person under its Directors & Officers insurance policies.  

policy, as in effect from time to time.

(g) Vacation.    The  Employee  will  be  entitled  to  paid  vacation  in  accordance  with  the  Company’s  vacation 

5. Confidential Information and Inventions.  The Employee agrees to continue to comply with the Company’s standard 

form of Proprietary Information and Inventions Agreement, as it may be amended from time to time (the “PIIA”).

6. Representations and Warranties.  

(a)

The Employee hereby represents and warrants to the Company as follows:

(i) Neither  the  execution  or  delivery  of  this  Agreement  nor  the  performance  by  the  Employee  of 
Employee’s duties and other obligations hereunder violate or will violate any statute, law, determination or award, or conflict with 
or constitute a default or breach of any covenant or obligation under (whether immediately, upon the giving of notice or lapse of 
time or both) any prior employment agreement, contract, or other instrument to which the Employee is a party or by which he is 
bound.

(ii) The Employee has the full right, power and legal capacity to enter and deliver this Agreement and to 
perform Employee’s duties and other obligations hereunder.  This Agreement constitutes the legal, valid and binding obligation of 
the  Employee  enforceable  against  him  in  accordance  with  its  terms.    No  approvals  or  consents  of  any  persons  or  entities  are 
required for the Employee to execute and deliver this Agreement or perform Employee’s duties and other obligations hereunder.

The Company hereby represents and warrants to the Employee that this Agreement and the employment 
of  the  Employee  hereunder  have  been  duly  authorized  by  and  on  behalf  of  the  Company,  including,  without  limitation,  by  all 
required action by the Board.

(b)

7. Termination.    The  Employee’s  employment  hereunder  shall  be  terminated  immediately  upon  the  Employee’s  death 

and may be otherwise terminated as follows:

the Chief Executive Officer.  Any of the following actions by the Employee shall constitute “Cause”:

(a)

The Employee’s employment hereunder may be terminated by the Company for Cause as determined by 

hereunder;

(i) The  willful  failure  or  disregard  or  continuing  refusal  by  the  Employee  to  perform  his  duties 

(ii) Any act of willful or intentional misconduct, or a grossly negligent act by the Employee having the 
effect of injuring, in a material way (as determined in good-faith by the Company), the business or reputation of the Company, 
including but not limited to, any officer, director, or executive of the Company; 

3

 
(iii)Willful misconduct by the Employee in carrying out his duties or obligations under this Agreement, 
including,  without  limitation,  insubordination  with  respect  to  lawful  directions  received  by  the  Employee  from  the  Chief 
Executive Officer or from the Board having the effect of injuring, in a material way (as determined in good-faith by the Chief 
Executive Officer), the business or reputation of the Company;

entry of a nolo contendere plea);

(iv)The  Employee’s  indictment  of  any  felony  or  a  misdemeanor  involving  moral  turpitude  (including 

(v) The determination by the Company, based upon clear and convincing evidence, after a reasonable 
and  good-faith  investigation  by  the  Company  following  a  written  allegation  by  another  employee  of  the  Company,  that  the 
Employee engaged in some form of harassment or discrimination prohibited by law (including, without limitation, age, sex or 
race discrimination);

assets (whether or not a misdemeanor or felony);

(vi)Any intentional misappropriation of the property of the Company, or embezzlement of its funds or 

(vii)Breach by the Employee of any of the provisions of the PIIA; and

(viii)Breach  by  the  Employee  of  any  provision  of  this  Agreement  other  than  those  contained  in  the 
PIIA, which is not cured by the Employee within thirty (30) business days after notice thereof is given to the Employee by the 
Company.

Except for a failure, misconduct, breach, or refusal which, by its nature, cannot reasonably be expected to be cured, the Employee 
shall have ten (10) business days from the delivery of written notice by the Company within which to cure any acts constituting 
Cause,  unless  a  longer  cure  period  is  provided  in  the  act  constituting  Cause  described  above;  provided  however,  that,  if  the 
Company  reasonably  expects  irreparable  injury  from  a  delay  of  ten  (10)  business  days,  the  Company  may  give  the  Employee 
notice of such shorter period within which to cure as is reasonable under the circumstances, which may include the termination of 
the Employee's employment for Cause without notice and with immediate effect.

(b)

The  Employee’s  employment  hereunder  may  be  terminated  by  the  Chief  Executive  Officer  due  to  the 
Employee’s Disability.  For purposes of this Agreement, a termination for  “Disability” shall occur (i) when the Chief Executive 
Officer has provided a written termination notice to the Employee supported by a written statement from a reputable independent 
physician  mutually  selected  by  the  Company  and  the  Employee,  or  the  Employee’s  legal  representatives  in  the  event  the 
Employee  is  unable  to  make  such  selection  due  to  mental  incapacity,  to  the  effect  that  the  Employee  shall  have  become  so 
physically or mentally incapacitated as to be unable to resume, even with reasonable accommodation as may be required under 
the Americans With Disabilities Act, within the ensuing twelve (12) months, the Employee’s employment hereunder by reason of 
physical or mental illness or injury, or (ii) upon rendering of a written termination notice by the Company after the Employee has 
been  unable  to  substantially  perform  his  duties  hereunder,  even  with  reasonable  accommodation  as  may  be  required  under  the 
Americans With Disabilities Act, for one hundred twenty (120) or more consecutive days, or more than one hundred eighty (180) 
days in any consecutive twelve (12) month period, by reason of any 

4

 
physical  or  mental  illness  or  injury.    For  purposes  of  this  Section  7(b),  the  Employee  agrees  to  make  himself  available  and  to 
cooperate  in  any  reasonable  examination  by  a  reputable  independent  physician  mutually  selected  by  the  Company  and  the 
Employee  and  paid  for  by  the  Company.    Notwithstanding  the  foregoing,  nothing  herein  shall  give  the  Company  the  right  to 
terminate the Employee prior to discharging its obligations to the Employee, if any, under the Family and Medical Leave Act, the 
Americans With Disabilities Act, or any other applicable law.  The Company shall reimburse the Employee for the Employee’s 
actual  cost  of  maintaining  a  supplementary  long-term  disability  insurance  policy  during  the  Term  up  to  a  maximum 
reimbursement of $10,000 per year.  

(c)

The Employee’s employment hereunder may be terminated by the Company (or its successor) by written 
notice  to  the  Employee  upon  the  occurrence  of  a  Change  of  Control.    For  purposes  of  this  Agreement,  “Change  of  Control” 
means (i) the acquisition, directly or indirectly, following the Effective Date by any person (as such term is defined in Section 
13(d) and 14(d)(2) of the Securities Exchange Act of 1934, as amended), in one transaction or a series of related transactions, of 
securities of the Company representing in excess of fifty percent (50%) of the combined voting power of the Company’s then 
outstanding securities if such person or his or its affiliate(s) do not own in excess of fifty percent (50%) of such voting power on 
the Effective Date of this Agreement, (ii) the future disposition by the Company (whether direct or indirect, by sale of assets or 
stock, merger, consolidation or otherwise) of all or substantially all of its business and/or assets in one transaction or series of 
related transactions other than a merger  effected exclusively for the purpose of changing the domicile of the Company, or (iii) a 
“corporate  transaction”  as  defined  in  the  Company  equity  incentive  plans  under  which  the  Employee  has  been  granted  Equity 
Awards.  Notwithstanding  the  foregoing,  if  the  Change  of  Control  does  not  constitute  a  change  in  the  ownership  or  effective 
control of the Company, or in the ownership of a substantial portion of the assets of the Company, within the meaning of Section 
409A of the Internal Revenue Code of 1986, as amended (the “Code”), the amount of cash severance payable pursuant to Section 
8(b), if any, shall be paid in equal installments in accordance with the Company’s then payroll practice over  a 12-month period.  
Solely  for  purposes  of  Section  409A  of  the  Code,  each  installment  payment  under  this  Agreement  is  considered  a  separate 
payment.  

(d)

The  Employee’s  employment  hereunder  may  be  voluntarily  terminated  by  the  Employee  for  Good 
Reason.  For purposes of this Agreement, “Good Reason” shall mean any of the following:  (i) any material reduction by the 
Company  of  the  Employee’s  duties,  or    responsibilities  or  authority  that,  taken  as  a  whole,  results  in  a  material  diminution  of 
position;  provided,  however,  that  a  change  in  the  Employee’s  title  or  reporting  relationship  shall  not  by  itself  constitute  a 
termination by the Employee for Good Reason under this clause (i); (ii) any material (meaning 10% or more) reduction by the 
Company of the Employee’s Base Salary and/or target Annual Performance Bonus payable hereunder (it being understood that an 
across-the-board reduction applicable to all similarly situated employees of the Company, including the Employee, shall not be 
deemed a reduction for purposes of this definition); (iii) in connection with a Change of Control or within the COC Period (as 
defined  in  Section  8(b)  below)  following  a  Change  of  Control,  a  material  adverse  change  in  the  reporting  structure  or  title 
applicable  to  the  Employee,  including  an  adverse  change  arising  from  a  material  diminution  in  the  authority,  duties  or 
responsibilities of the supervisor to whom the Employee is required to report (e.g., the Employee no longer reports to the Chief 
Executive Officer of the Company or its successor); (iv) any requirement by the Company, without the Employee’s prior written 
consent, that the Employee 

5

 
locate the Employee’s residence or primary place of employment to a location outside a 50-mile radius of such location mutually 
agreed upon between the Company and the Employee as of the Effective Date, or such other location that the Company and the 
Employee may mutually agree upon and designate from time to time during the Term; or (v) a material breach by the Company of 
Section 6(b) of this Agreement which is not cured by the Company within thirty (30) days after written notice thereof is given to 
the  Company  by  the  Employee.    However,  notwithstanding  the  above,  Good  Reason  shall  not  exist  unless:  (x)  the  Employee 
notifies  in  writing  the  Chief  Executive  Officer  within  thirty  (30)  days  of  the  initial  existence  of  one  of  the  adverse  events 
described above, and (y) the Company fails to correct the adverse event within thirty (30) days of such written notice, and (z) the 
Employee’s voluntary termination because of the existence of one or more of the adverse events described above occurs within 
ninety (90) days of the initial existence of the event. 

The Employee’s employment may be terminated by the Company without Cause by delivery of written 
notice to the Employee effective the date of delivery of such notice.  For the avoidance of doubt, termination of the Employee’s 
employment due to his death or Disability does not constitute a termination for Cause.

(e)

delivery of written notice to the Company effective fifteen (15) days after the date of delivery of such notice.

(f)

The  Employee’s  employment  may  be  terminated  by  the  Employee  in  the  absence  of  Good  Reason  by 

8. Compensation upon Termination.

(a) Accrued  Benefits.    Upon  termination  of  the  Employee’s  employment  by  either  party  regardless  of  the 
cause or reason, the Employee shall be entitled to the following, referred to herein as the “Accrued Benefits”:  (i) payment for 
any accrued, unpaid Base Salary through the termination date; (ii) if provided for under the Company’s vacation plan or policy or 
required by applicable law, payment for any accrued, unused vacation days through the termination date; and (iii) reimbursement 
for  any  approved  business  expenses  that  the  Employee  has  timely  submitted  for  reimbursement  in  accordance  with  the
Company’s business expense reimbursement policy or practice.   Except as otherwise expressly provided by this Agreement, the 
Company  shall  have  no  further  payment  obligations  to  the  Employee  and  all  Equity  Awards  that  have  not  vested  as  of  the
termination  date  shall  be  forfeited  to  the  Company  as  of  such  date.    Subject  to  this  Section  8,  the  vested  portion  of  any  stock 
options held by the Employee as of the Employee’s termination date shall remain exercisable for ninety (90) days following such
termination.  

(b) Change  of  Control  Separation  Benefits.    If  the  Employee’s  employment  is  terminated  by  the  Company 
due to Disability pursuant to Section 7(b), by the Company without Cause pursuant to Section 7(e) or by the Employee for Good 
Reason pursuant to Section 7(d) and such termination occurs during the period beginning on the Change of Control and ending 
twelve (12) months immediately following such Change of Control (the “COC Period”), provided that the Employee signs and
does not revoke a general release of claims against the Company within the time period specified therein (which time period shall 
not exceed sixty (60) days), in form and substance satisfactory to the Company (the “Release”), then the Company shall provide 
the  following  benefits  to  the  Employee,  referred  to  herein  as  the  “Change  of  Control  Separation  Benefits”:   (i) a lump sum 
payment equal to twelve (12) months of the Employee’s then-current 

6

 
Base Salary; (ii) the full target Annual Performance Bonus for the year in which such termination occurs, less any installments 
paid in advance (items (i) and (ii) being the “Change of Control Separation Pay”); (iii) immediate vesting in full of all Equity 
Awards  with  time  based  vesting;  and  (iv)  if  the  Employee  properly  and  timely  elects  to  continue  his  health  insurance  benefits 
under COBRA or applicable state continuation coverage after the termination date, reimbursement for the portion of Employee’s 
health  continuation  coverage  premiums  that  the  Company  would  have  paid  had  the  Employee  remained  employed  by  the 
Company until the earlier of (A) the twelve (12) months following the month in which the Employee’s termination date occurs, or 
(B) the maximum period permitted by applicable law, provided that the Company’s obligation to pay a portion of the Employee’s 
health continuation coverage premiums will terminate if Employee becomes eligible for health insurance benefits from another 
employer during the reimbursement period.  Subject to the Release being effective, the Change of Control Separation Pay will be 
paid within sixty (60) days after the termination date; provided, however, that if the 60-day period begins in one calendar year and 
ends in a second calendar year, such payments, to the extent they qualify as “non-qualified deferred compensation” within the 
meaning of Section 409A of the Code, shall be paid no earlier than the first Company payroll date in the second calendar year 
and, in any case, by the last day of such 60-day period.

(c)

Base Separation Benefits.  If the Employee’s employment is terminated during the Term and outside of 
the COC Period as a result of the Employee’s Disability pursuant to Section 7(b), by the Company without Cause pursuant to 
Section  7(e),  or  by  the  Employee  for  Good  Reason  pursuant  to  Section  7(d),  provided  that  the  Employee  signs  and  does  not 
revoke  the  Release  within  the  time  period  specified  therein  (which  time  period  shall  not  exceed  sixty  (60)  days),  then  the 
Company  shall  provide  the  following  benefits  to  the  Employee,  referred  to  herein  as  the  “Base Separation Benefits”:    (i)  the 
continued payment in installments of the Employee’s then-current Base Salary for a period of twelve (12) months following the 
termination date (the “Base Separation Pay”); and (ii) if the Employee properly and timely elects to continue Employee’s health 
insurance  benefits  under  COBRA  or  applicable  state  continuation  coverage  after  the  termination  date,  reimbursement  for  the 
portion  of  the  Employee’s  health  continuation  coverage  premiums  that  the  Company  would  have  paid  had  the  Employee 
remained employed by the Company until the earlier of (A) the twelve (12) months following the month in which the Employee’s 
termination date occurs, or (B) the maximum period permitted by applicable law, provided that the Company’s obligation to pay a 
portion  of  the  Employee’s  health  continuation  coverage  premiums  will  terminate  if  he  becomes  eligible  for  health  insurance 
benefits from another employer during the reimbursement period.  The first installment of the Base Separation Pay will be paid
on  the  Company’s  first  regular  payday  occurring  following  the  effectiveness  of  the  Release  in  an  amount  equal  to  the  sum  of 
payments of Base Salary that would have been paid if Employee had remained in employment for the period from the termination 
date through the payment date.  The remaining installments will be paid until the end of the 12-month period at the same rate as 
the Base Salary in accordance with the Company’s normal payroll practices for its employees. Notwithstanding the foregoing, if 
the 60-day period for the execution and non-revocation of the Release begins in one calendar year and ends in a second calendar 
year, the Base Separation Pay, to the extent it qualifies as “non-qualified deferred compensation” within the meaning of Section 
409A of the Code, shall begin to be paid no earlier than the first Company payroll date in the second calendar year and, in any 
case, by the last day of such 60-day period; provided, however, that the initial payment shall include a catch-up payment to cover 
amounts retroactive to the day immediately following the termination date.  The Employee understands that if the Employee is 
eligible to receive the Base Separation Benefits, such Base Separation Benefits shall be in lieu of 

7

 
and not in addition to the Change of Control Separation Benefits described in Section 8(b) of this Agreement.  Notwithstanding 
the foregoing, if the Employee is entitled to receive the Base Separation Benefits but violates any provisions of this Agreement, 
the PIIA or any other agreement entered into by the Employee and the Company after termination of employment, the Company 
will be entitled to immediately stop paying any further installments of the Base Separation Benefits.  

(d)

This  Section  8  sets  forth  the  only  obligations  of  the  Company  with  respect  to  the  termination  of  the 
Employee’s employment with the Company, except as otherwise required by law, and the Employee acknowledges that, upon the 
termination  of  the  Employee’s  employment,  the  Employee  shall  not  be  entitled  to  any  payments  or  benefits  which  are  not 
explicitly provided in Section 8.  

(e) Upon  termination  of  the  Employee’s  employment  hereunder  for  any  reason,  the  Employee  shall  be 
deemed to have resigned as director and/or officer of the Company and each subsidiary of the Company, to the extent applicable, 
effective as of the date of such termination, unless otherwise requested by the Board.

(f)

The provisions of this Section 8 shall survive any termination of this Agreement.

9. Section 409A.  The intent of the parties to this Agreement is that the payments, compensation and benefits under this 
Agreement be exempt from or comply with Section 409A of the Code and the regulations and guidance promulgated thereunder 
(collectively, “Section 409A”) and, in this connection, the following shall be applicable:

(a)
with Section 409A.  

To the greatest extent possible, this Agreement shall be interpreted to be exempt from or in compliance 

If  any  severance,  compensation,  or  benefit  required  by  this  Agreement  is  to  be  paid  in  a  series  of 
installment payments, each individual payment in the series shall be considered a separate payment for purposes of Section 409A.

(b)

(c)

If  any  severance,  compensation,  or  benefit  required  by  this  Agreement  that  constitutes  “nonqualified 
deferred compensation” within the meaning of Section 409A is considered to be paid on account of “separation from service” 
within  the  meaning  of  Section  409A,  and  the  Employee  is  a  “specified  employee”  within  the  meaning  of  Section  409A,  no 
payments of any of such severance, compensation, or benefit shall be made until the earlier of six (6) months plus one (1) day 
after  such  separation  from  service  or  the  Employee’s  death  (the  “New  Payment  Date”).    The  aggregate  amount  of  any  such 
payments  that  would  have  otherwise  been  paid  during  the  period  between  the  date  of  separation  from  service  and  the  New 
Payment Date shall be paid to the Employee or his estate in a lump sum payment on the New Payment Date.  Thereafter, any 
severance, compensation, or benefit required by this Agreement that remains outstanding as of the day immediately following the 
New Payment Date shall be paid without delay over the time period originally scheduled, in accordance with the terms of this 
Agreement.

8

 
(d)

To the extent that any payment or benefit described in this Agreement constitutes “non-qualified deferred 
compensation” under Section 409A of the Code, and to the extent that such payment or benefit is payable upon the Employee’s 
termination of employment, then such payments or benefits shall be payable only upon the Employee’s “separation from service.”  
The  determination  of  whether  and  when  a  separation  from  service  has  occurred  shall  be  made  in  accordance  with  the 
presumptions set forth in Treasury Regulation Section 1.409A 1(h).

The  Company  makes  no  representation  or  warranty  and  shall  have  no  liability  to  the  Employee  or  any 
other person if any provisions of this Agreement are determined to constitute deferred compensation subject to Section 409A of 
the Code but do not satisfy an exemption from, or the conditions of, such Section.

(e)

(f)

The provisions of this Section 9 shall survive any termination of this Agreement.

10.Section 280G.

(a) Notwithstanding any other provision of this Agreement or any other plan, arrangement or agreement to 
the contrary, if any of the payments or benefits provided or to be provided by the Company or its affiliates to the Employee or for 
the  Employee’s  benefit  pursuant  to  the  terms  of  this  Agreement  or  otherwise  (“Covered  Payments”)  constitute  parachute 
payments  (“Parachute  Payments”)  within  the  meaning  of  Section  280G  of  the  Code  and  would,  but  for  this  Section  10  be 
subject to the excise tax imposed under Section 4999 of the Code (or any successor provision thereto) or any similar tax imposed 
by state or local law or any interest or penalties with respect to such taxes (collectively, the “Excise Tax”), then prior to making 
the  Covered  Payments,  a  calculation  shall  be  made  comparing  (i)  the  Net  Benefit  (as  defined  below)  to  the  Employee  of  the 
Covered Payments after payment of the Excise Tax to (ii) the Net Benefit to the Employee if the Covered Payments are limited to 
the  extent  necessary  to  avoid  being  subject  to  the  Excise  Tax.  Only  if  the  amount  calculated  under  (i)  above  is  less  than  the 
amount under (ii) above will the Covered Payments be reduced to the minimum extent necessary to ensure that no portion of the 
Covered  Payments  is  subject  to  the  Excise  Tax  (that  amount,  the  “Reduced Amount”).  “Net  Benefit”  shall  mean  the  present 
value of the Covered Payments net of all federal, state, local, foreign income, employment and excise taxes.

(b) Any such reduction shall be made in accordance with Section 409A of the Code and the following:  (i) the 
Covered  Payments  which  do  not  constitute  nonqualified  deferred  compensation  subject  to  Section  409A  of  the  Code  shall  be 
reduced first; and (ii) all other Covered Payments shall then be reduced as follows: (A) cash payments shall be reduced before 
non-cash payments; and (B) payments to be made on a later payment date shall be reduced before payments to be made on an 
earlier payment date.

(c) Any determination required under this Section 10 shall be made in writing in good faith by the accounting 
firm  that  was  the  Company’s  independent  auditor  immediately  before  the  Change  of  Control  (the  “Accounting  Firm”).    The
Accounting Firm shall provide detailed supporting calculations to the Company and the Employee as requested by the Company 
or the Employee. The Company and the Employee shall provide the Accounting Firm with such information and documents as 
the Accounting Firm may reasonably request in order to make a 

9

 
determination under this Section 10.  For purposes of making the calculations and determinations required by this Section 10, the 
Accounting Firm may rely on reasonable, good faith assumptions and approximations concerning the application of Section 280G 
and  Section  4999  of  the  Code.  The  Accounting  Firm’s  determinations  shall  be  final  and  binding  on  the  Company  and  the 
Employee. The Company shall be responsible for all fees and expenses incurred by the Accounting Firm in connection with the 
calculations required by this Section 10.

It is possible that after the determinations and selections made pursuant to this Section 10 the Employee 
will receive Covered Payments that are in the aggregate more than the amount provided under this Section 10 (“Overpayment”) 
or less than the amount provided under this Section 10 (“Underpayment”). 

(d)

(i) In the event that: (A) the Accounting Firm determines, based upon the assertion of a deficiency by 
the  Internal  Revenue  Service  against  either  the  Company  or  the  Employee  which  the  Accounting  Firm  believes  has  a  high 
probability of success, that an Overpayment has been made or (B) it is established pursuant to a final determination of a court or 
an Internal Revenue Service proceeding that has been finally and conclusively resolved that an Overpayment has been made, then 
the Employee shall pay any such Overpayment to the Company.

(ii) In  the  event  that:  (A)  the  Accounting  Firm,  based  upon  controlling  precedent  or  substantial 
authority,  determine  that  an  Underpayment  has  occurred  or  (B)  a  court  of  competent  jurisdiction  determines  that  an 
Underpayment  has  occurred,  any  such  Underpayment  will  be  paid  promptly  by  the  Company  to  or  for  the  benefit  of  the 
Employee.

11.Miscellaneous.

State of California, without giving effect to its principles of conflicts of laws.

(a)

This Agreement shall be governed by, and construed and interpreted in accordance with, the laws of the 

(b)

In the event of any dispute arising out of, or relating to, this Agreement or the breach thereof, or regarding 
the interpretation thereof, the parties agree to submit any differences to nonbinding mediation prior to pursuing resolution through 
the  courts.    The  parties  hereby  submit  to  the  exclusive  jurisdiction  of  the  state  and  federal  courts  situated  in  San  Francisco 
County, California, and agree that service of process in such court proceedings shall be satisfactorily made upon each other if sent 
by registered mail addressed to the recipient at the address referred to in Section 11(g) below. 

heirs, legal representatives, successors and permitted assigns.

(c)

This Agreement shall be binding upon and inure to the benefit of the parties hereto, and their respective 

(d)

This  Agreement,  and  the  Employee’s  rights  and  obligations  hereunder,  may  not  be  assigned  by  the 
Employee.  The rights and obligations of the Company under this Agreement shall inure to the benefit of and shall be binding 
upon  the  successors  and  assigns  of  the  Company,  including  any  successors  or  assigns  in  connection  with  any  sale,  transfer  or 
other disposition of all or substantially all of its business or assets.

10

 
(e)
agreement signed by the parties hereto.

This Agreement cannot be amended orally, or by any course of conduct or dealing, but only by a written 

(f)

The  failure  of  either  party  to  insist  upon  the  strict  performance  of  any  of  the  terms,  conditions  and 
provisions  of  this  Agreement  shall  not  be  construed  as  a  waiver  or  relinquishment  of  future  compliance  therewith,  and  such 
terms, conditions and provisions shall remain in full force and effect.  No waiver of any term or condition of this Agreement on 
the part of either party shall be effective for any purpose whatsoever unless such waiver is in writing and signed by such party.

(g) All  notices,  requests,  consents  and  other  communications,  required  or  permitted  to  be  given  hereunder, 
shall  be  in  writing  and  shall  be  delivered  personally  or  by  an  overnight  courier  service  or  sent  by  registered  or  certified  mail, 
postage prepaid, return receipt requested, to the Employee at the last address of record in his personnel file and to the Company at 
the address for its corporate headquarters, and shall be deemed given when so delivered personally or by overnight courier, or, if 
mailed, five days after the date of deposit in the United States mail.  Either party may designate another address, for receipt of 
notices hereunder by giving notice to the other party in accordance with this Section 11(g).

(h)

This  Agreement  sets  forth  the  entire  agreement  and  understanding  of  the  parties  relating  to  the  subject 
matter  hereof,  and  supersedes  all  prior  agreements,  arrangements  and  understandings,  written  or  oral,  relating  to  the  subject 
matter hereof, including the offer letter dated October 21, 2020 by and between the Company and Employee.  No representation, 
promise or inducement has been made by either party that is not embodied in this Agreement, and neither party shall be bound by 
or liable for any alleged representation, promise or inducement not so set forth.

entity controlling, controlled by or under common control with the specified person or entity.

(i)

As used in this Agreement, “affiliate” of a specified person or entity shall mean and include any person or 

meaning or interpretation of this Agreement.

(j)

The section headings contained herein are for reference purposes only and shall not in any way affect the 

(k)

This Agreement may be executed in one or more counterparts, each of which shall be deemed an original 
and  all  of  which  together  shall  constitute  one  and  the  same  original,  binding  document.  Any  facsimile,  PDF  reproduction  of 
original signatures or other electronic transmission of a signed counterpart shall be deemed to be an original counterpart and any 
signature appearing thereon shall be deemed to be an original signature.  Each party agrees that the electronic signatures of the 
parties included in this Agreement, including via DocuSign®, are intended to authenticate this writing and to have the same force 
and effect as manual signatures.

[Remainder of Page Intentionally Left Blank – Signature Page Follows]

11

 
 
IN  WITNESS  WHEREOF,  the  parties  hereto  have  executed  this  Agreement  and  intend  it  to  be  effective  as  of  the 

Effective Date by proper person thereunto duly authorized.

ASSEMBLY BIOSCIENCES, INC.

By:
Name:
Title:

/s/ John G. McHutchison, A.O., M.D.
John G. McHutchison, A.O., M.D.
Chief Executive Officer and President

EMPLOYEE

/s/ Nicole S. White, Ph.D.
Name: Nicole S. White, Ph.D.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Subsidiaries of Assembly Biosciences, Inc.

Exhibit 21.1

Subsidiaries
Assembly Pharmaceuticals, Inc.
Assembly Biotechnology Development (Shanghai) Co, Ltd.
Assembly Biosciences Hong Kong Limited
Assembly Biosciences Cayman 

State or Other Jurisdiction of
Incorporation or Organization
Delaware
China
Hong Kong
Cayman Islands

 
 
 
 
 
 
 
 
We consent to the incorporation by reference in the following Registration Statements:

Consent of Independent Registered Public Accounting Firm

Exhibit 23.1

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

(12)

(13)

(14)

Registration Statement (Form S-3 No. 333-270760) of Assembly Biosciences, Inc.,

Registration  Statement  (Form  S-8  No.  333-173613)  pertaining  to  the  Ventrus  Biosciences,  Inc.  2007  Stock  Incentive  Plan  and  the 
Ventrus Biosciences, Inc. 2010 Equity Incentive Plan,

Registration Statement (Form S-8 No. 333-182167) pertaining to the Ventrus Biosciences, Inc. 2010 Equity Incentive Plan,

Registration Statement (Form S-8 No. 333-198803) pertaining to the Assembly Biosciences, Inc. 2014 Stock Incentive Plan,

Registration Statement (Form S-8 No. 333-213019) pertaining to the Assembly Biosciences, Inc. Amended and Restated 2014 Stock 
Incentive Plan,

Registration Statement (Form S-8 No. 333-216902) pertaining to certain Non-Qualified Stock Option Agreements dated May 16, 2014,

Registration Statement (Form S-8 No. 333-219919) pertaining to the Assembly Biosciences, Inc. 2017 Inducement Award Plan,

Registration  Statement  (Form  S-8  No.  333-226703)  pertaining  to  the  Assembly  Biosciences,  Inc.  2018  Stock  Incentive  Plan  and  the 
Assembly Biosciences, Inc. 2018 Employee Stock Purchase Plan,

Registration Statement (Form S-8 No. 333-233030) pertaining to the Assembly Biosciences, Inc. 2018 Stock Incentive Plan,

Registration Statement (Form S-8 No. 333-234580) pertaining to the Assembly Biosciences, Inc. 2019 Inducement Award Plan and the 
Assembly Biosciences, Inc. Amended and Restated 2014 Stock Incentive Plan,

Registration  Statement  (Form  S-8  No.  333-248476)  pertaining  to  the  Assembly  Biosciences,  Inc.  2018  Stock  Incentive  Plan  and  the 
Assembly Biosciences, Inc. 2020 Inducement Award Plan, 

Registration  Statement  (Form  S-8  No.  333-258516)  pertaining  to  the  Assembly  Biosciences,  Inc.  2018  Stock  Incentive  Plan  and  the 
Assembly Biosciences, Inc. Amended and Restated 2018 Employee Stock Purchase Plan,

Registration Statement (Form S-8 No. 333-266711) pertaining to the Assembly Biosciences, Inc. 2018 Stock Incentive Plan,

Registration Statement (Form S-8 No. 333-273836) pertaining to the Assembly Biosciences, Inc. 2018 Stock Incentive Plan and the 
Assembly Biosciences, Inc. Amended and Restated 2014 Stock Incentive Plan

of our report dated March 28, 2024, with respect to the consolidated financial statements of Assembly Biosciences, Inc. included in this Annual Report 
(Form 10-K) of Assembly Biosciences, Inc. for the year ended December 31, 2024.

/s/ Ernst & Young LLP

San Jose, California
March 28, 2024

 
 
 
 
 
Exhibit 31.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Jason A. Okazaki, certify that:

(1)

I have reviewed this annual report on Form 10-K for the year ended December 31, 2023 of Assembly Biosciences, Inc.;

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the 
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this 
report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects, the 

financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

(4) The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in 
Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-
15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure 
that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, 
particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, 
to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in 
accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness 

of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal 
quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, 
the registrant’s internal control over financial reporting; and

(5) The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to 

the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably 

likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over 

financial reporting.

Dated: March 28, 2024

/s/ Jason A. Okazaki

Jason A. Okazaki
Chief Executive Officer and President
(Principal Executive Officer and Principal Financial Officer)

 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

In connection with the annual report on Form 10-K of Assembly Biosciences, Inc. (the Company) for the fiscal year ended December 31, 2023, as 
filed with the Securities and Exchange Commission on the date hereof (the Report), I, Jason A. Okazaki, Chief Executive Officer and President (Principal 
Executive Officer and Principal Financial Officer) of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the 
Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: March 28, 2024

/s/ Jason A. Okazaki

Jason A. Okazaki
Chief Executive Officer and President
(Principal Executive Officer and Principal Financial Officer)

 
 
 
 
 
 
 
 
Exhibit 97.1

CLAWBACK POLICY

The Board of Directors (the “Board”) of Assembly Biosciences, Inc. (the “Company”) believes that it is appropriate for the Company to 
adopt this Clawback Policy (the “Policy”) to be applied to the Execuve Officers of the Company and adopts this Policy to be effecve as 
of the Effecve Date.   

1.Definions

For purposes of this Policy, the following definions shall apply:

a)

“Commiee” means the Compensaon Commiee of the Board.

b)

“Company Group” means the Company and each of its Subsidiaries, as applicable. 

c)

“Covered Compensaon” means any Incenve-Based Compensaon granted, vested or paid to a person who served as an 
Execuve Officer at any me during the performance period for the Incenve-Based Compensaon and that was received 
(1) on or aer the effecve date of the Nasdaq lisng standard, (2) aer the person became an Execuve Officer and (3) at 
a me that the Company had a class of securies listed on a naonal securies exchange or a naonal securies 
associaon.

d)

“Effecve Date” means October 2, 2023. 

e)

“Erroneously Awarded Compensaon” means the amount of Covered Compensaon granted, vested or paid to a person 
during the fiscal period when the applicable Financial Reporng Measure relang to such Covered Compensaon was 
aained that exceeds the amount of Covered Compensaon that otherwise would have been granted, vested or paid to 
the person had such amount been determined based on the applicable Restatement, computed without regard to any 
taxes paid (i.e., on a pre-tax basis). For Covered Compensaon based on stock price or total stockholder return, where the 
amount of Erroneously Awarded Compensaon is not subject to mathemacal recalculaon directly from the informaon 
in a Restatement, the Commiee will determine the amount of such Covered Compensaon that constutes Erroneously 
Awarded Compensaon, if any, based on a reasonable esmate of the effect of the Restatement on the stock price or total 
stockholder return upon which the Covered Compensaon was granted, vested or paid and the Commiee shall maintain 
documentaon of such determinaon and provide such documentaon to the Nasdaq.

f)

“Exchange Act” means the Securies Exchange Act of 1934.

g)

“Execuve Officer” means each “officer” of the Company as defined under Rule 16a-1(f) under Secon 16 of the Exchange 
Act, which shall be deemed to include any individuals idenfied by the Company as execuve officers pursuant to Item 
401(b) of Regulaon S-K under the Exchange Act. Both current and former Execuve Officers are subject to the Policy in 
accordance with its terms.

Two Tower Place, 7th Floor, South San Francisco, CA 94080

 
 
 
 
 
 
 
h)

i)

j)

k)

“Financial Reporng Measure” means (1) any measure that is determined and presented in accordance with the 
accounng principles used in preparing the Company’s financial statements, and any measures derived wholly or in part 
from such measures and may consist of GAAP or non-GAAP financial measures (as defined under Regulaon G of the 
Exchange Act and Item 10 of Regulaon S-K under the Exchange Act), (2) stock price or (3) total stockholder return. 
Financial Reporng Measures may or may not be filed with the SEC and may be presented outside the Company’s financial 
statements, such as in Managements’ Discussion and Analysis of Financial Condions and Result of Operaons or in the 
performance graph required under Item 201(e) of Regulaon S-K under the Exchange Act.

“Home Country” means the Company’s jurisdicon of incorporaon. 

“Incenve-Based Compensaon” means any compensaon that is granted, earned or vested based wholly or in part upon 
the aainment of a Financial Reporng Measure.  Incenve-Based Compensaon is deemed “received” in the Company’s 
fiscal period during which the Financial Reporng Measure specified in or otherwise relang to the Incenve-Based 
Compensaon award is aained, even if the grant, vesng or payment of the Incenve-Based Compensaon occurs aer 
the end of that period.

“Lookback Period” means the three completed fiscal years (plus any transion period of less than nine months that is 
within or immediately following the three completed fiscal years and that results from a change in the Company’s fiscal 
year) immediately preceding the date on which the Company is required to prepare a Restatement for a given reporng 
period, with such date being the earlier of: (1) the date the Board, a commiee of the Board, or the officer or officers of 
the Company authorized to take such acon if Board acon is not required, concludes, or reasonably should have 
concluded, that the Company is required to prepare an Restatement, or (2) the date a court, regulator or other legally 
authorized body directs the Company to prepare a Restatement. Recovery of any Erroneously Awarded Compensaon 
under the Policy is not dependent on if or when the Restatement is actually filed.  

l)

“Nasdaq” means the Nasdaq Stock Market.

m) “Restatement” means a required accounng restatement of any Company financial statement due to the material 

noncompliance of the Company with any financial reporng requirement under the securies laws, including (1) to correct 
an error in previously issued financial statements that is material to the previously issued financial statements (commonly 
referred to as a “Big R” restatement) or (2) to correct an error in previously issued financial statements that is not material 
to the previously issued financial statements but that would result in a material misstatement if the error were corrected in 
the current period or le uncorrected in the current period (commonly referred to as a “lile r” restatement). Changes to 
the Company’s financial statements that do not represent error correcons under the then-current relevant accounng 
standards will not constute Restatements. Recovery of any Erroneously Awarded Compensaon under the Policy is not 
dependent on fraud or misconduct by any person in connecon with the Restatement. 

n)

“SEC” means the United States Securies and Exchange Commission.

o)

“Subsidiary” means any domesc or foreign corporaon, partnership, associaon, joint stock company, joint venture, trust 
or unincorporated organizaon “affiliated” with the Company, that is, directly or indirectly, through one or more 
intermediaries, “controlling”, “controlled by” or “under 

2

 
 
 
common control with”, the Company. “Control” for this purpose means the possession, direct or indirect, of the power to 
direct or cause the direcon of the management and policies of such person, whether through the ownership of vong 
securies, contract or otherwise.

2.Recoupment of Erroneously Awarded Compensaon

In the event of a Restatement, any Erroneously Awarded Compensaon received during the Lookback Period prior to the Restatement 
(a) that is then-outstanding but has not yet been paid shall be automacally and immediately forfeited and (b) that has been paid to any 
person shall be subject to reasonably prompt repayment to the Company Group in accordance with Secon 3 of this Policy. The 
Commiee must pursue (and shall not have the discreon to waive) the forfeiture and/or repayment of such Erroneously Awarded 
Compensaon in accordance with Secon 3 of this Policy, except as provided below.

Notwithstanding the foregoing, the Commiee (or, if the Commiee is not a commiee of the Board responsible for the Company’s 
execuve compensaon decisions and composed enrely of independent directors, a majority of the independent directors serving on 
the Board) may determine not to pursue the forfeiture and/or recovery of Erroneously Awarded Compensaon from any person if the 
Commiee determines that such forfeiture and/or recovery would be impraccable due to any of the following circumstances: (1) the 
direct expense paid to a third party (for example, reasonable legal expenses and consulng fees) to assist in enforcing the Policy would 
exceed the amount to be recovered (following reasonable aempts by the Company Group to recover such Erroneously Awarded 
Compensaon, the documentaon of such aempts, and the provision of such documentaon to the Nasdaq), (2) pursuing such 
recovery would violate the Company’s Home Country laws adopted prior to November 28, 2022 (provided that the Company obtains an 
opinion of Home Country counsel acceptable to the Nasdaq that recovery would result in such a violaon and provides such opinion to 
the Nasdaq), or (3) recovery would likely cause any otherwise tax-qualified rerement plan, under which benefits are broadly available to 
employees of Company Group, to fail to meet the requirements of 26 U.S.C. 401(a)(13) or 26 U.S.C. 411(a) and regulaons thereunder.

3.Means of Repayment

In the event that the Commiee determines that any person shall repay any Erroneously Awarded Compensaon, the Commiee shall 
provide wrien noce to such person by email or cerfied mail to the physical address on file with the Company Group for such person, 
and the person shall sasfy such repayment in a manner and on such terms as required by the Commiee, and the Company Group shall 
be entled to set off the repayment amount against any amount owed to the person by the Company Group, to require the forfeiture of 
any award granted by the Company Group to the person, or to take any and all necessary acons to reasonably promptly recoup the 
repayment amount from the person, in each case, to the fullest extent permied under applicable law, including without limitaon, 
Secon 409A of the Internal Revenue Code and the regulaons and guidance thereunder. If the Commiee does not specify a repayment 
ming in the wrien noce described above, the applicable person shall be required to repay the Erroneously Awarded Compensaon to 
the Company Group by wire, cash or cashier’s check no later than thirty (30) days aer receipt of such noce.

4.No Indemnificaon

No person shall be indemnified, insured or reimbursed by the Company Group in respect of any loss of compensaon by such person in 
accordance with this Policy, nor shall any person receive any advancement of expenses for disputes related to any loss of compensaon 
by such person in accordance with this Policy, and no person shall be paid or reimbursed by the Company Group for any premiums paid 
by such person for any 

3

 
 
 
third-party insurance policy covering potenal recovery obligaons under this Policy. For this purpose, “indemnificaon” includes any 
modificaon to current compensaon arrangements or other means that would amount to de facto indemnificaon (for example, 
providing the person a new cash award which would be cancelled to effect the recovery of any Erroneously Awarded Compensaon). In 
no event shall the Company Group be required to award any person an addional payment if any Restatement would result in a higher 
incenve compensaon payment.

5.Miscellaneous 

This Policy generally will be administered and interpreted by the Commiee.  Any determinaon by the Commiee with respect to this 
Policy shall be final, conclusive and binding on all interested pares.  Any discreonary determinaons of the Commiee under this 
Policy, if any, need not be uniform with respect to all persons, and may be made selecvely amongst persons, whether or not such 
persons are similarly situated.

This Policy is intended to sasfy the requirements of Secon 954 of the Dodd-Frank Wall Street Reform and Consumer Protecon Act, as 
it may be amended from me to me, and any related rules or regulaons promulgated by the SEC or the Nasdaq, including any 
addional or new requirements that become effecve aer the Effecve Date which upon effecveness shall be deemed to 
automacally amend this Policy to the extent necessary to comply with such addional or new requirements.

The provisions in this Policy are intended to be applied to the fullest extent of the law.  To the extent that any provision of this Policy is 
found to be unenforceable or invalid under any applicable law, such provision will be applied to the maximum extent permied and shall 
automacally be deemed amended in a manner consistent with its objecves to the extent necessary to conform to applicable law.  The 
invalidity or unenforceability of any provision of this Policy shall not affect the validity or enforceability of any other provision of this 
Policy.  Recoupment of Erroneously Awarded Compensaon under this Policy is not dependent upon the Company Group sasfying any 
condions in this Policy, including any requirements to provide applicable documentaon to Nasdaq.

The rights of the Company Group under this Policy to seek forfeiture or reimbursement are in addion to, and not in lieu of, any rights of 
recoupment, or remedies or rights other than recoupment, that may be available to the Company Group pursuant to the terms of any 
law, government regulaon or stock exchange lisng requirement or any other policy, code of conduct, employee handbook, 
employment agreement, equity award agreement, or other plan or agreement of the Company Group. 

6.Amendment and Terminaon

To the extent permied by, and in a manner consistent with applicable law, including SEC and Nasdaq rules, the Commiee may 
terminate, suspend or amend this Policy at any me in its discreon.

7.Successors

This Policy shall be binding and enforceable against all persons and their respecve beneficiaries, heirs, executors, administrators or 
other legal representaves with respect to any Covered Compensaon granted, vested or paid to or administered by such persons or 
enes.

Approved by the Compensaon Commiee: September 12, 2023

Adopted by the Board of Directors: September 13, 2023

4

 
 
 
ASSEMBLY BIOSCIENCES, INC.

CLAWBACK POLICY

ACKNOWLEDGMENT, CONSENT AND AGREEMENT

I acknowledge that I have received and reviewed a copy of the Assembly Biosciences, Inc. Clawback Policy (as may be amended from 
me to me, the “Policy”) and I have been given an opportunity to ask quesons about the Policy and review it with my counsel.  I 
knowingly, voluntarily and irrevocably consent to and agree to be bound by and subject to the Policy’s terms and condions, including 
that I will return any Erroneously Awarded Compensaon that is required to be repaid in accordance with the Policy. I further 
acknowledge, understand and agree that (1) the compensaon that I receive, have received or may become entled to receive from the 
Company Group is subject to the Policy, and the Policy may affect such compensaon and (2) I have no right to indemnificaon, 
insurance payments or other reimbursement by or from the Company Group for any compensaon that is subject to recoupment and/or 
forfeiture under the Policy. Capitalized terms not defined herein have the meanings set forth in the Policy.

Signed:

Print Name:

Date: