10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

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

For the fiscal year ended December 31, 2023

☐ 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: 001-34207

Dynavax Technologies Corporation

(Exact name of registrant as specified in its charter)

Delaware	33-0728374
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)

2100 Powell Street, Suite 720

Emeryville, CA 94608

(510) 848-5100

(Address, including Zip Code, and telephone number, including area code, of the registrant’s principal executive offices)

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

Title of each class:	Trading symbol(s):	Name of each exchange on which registered:
Common Stock, $0.001 par value	DVAX	Nasdaq Global Select Market

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

None

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

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

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

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

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

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

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

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒

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

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

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

The aggregate market value of the voting and non-voting stock held by non-affiliates of the registrant, based upon the closing sale price of the common stock on June 30, 2023 as reported on the Nasdaq Global Select Market, was approximately $0.9 billion. Shares of common stock held by each officer and director and by each person known to the Company who owns 5% or more of the outstanding common stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

As of February 20, 2024, the registrant had outstanding 130,614,772 shares of common stock.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Definitive Proxy Statement for the registrant’s 2024 Annual Meeting of Stockholders are incorporated by reference into Part III, Items 10-14 of this Form 10-K. The Definitive Proxy Statement will be filed no later than 120 days after the close of the registrant’s fiscal year ended December 31, 2023.

Auditor Firm Id: 42 Auditor Name: Ernst & Young LLP Auditor Location: San Francisco, California

INDEX

DYNAVAX TECHNOLOGIES CORPORATION

		Page No.
PART I
Item 1.	BUSINESS	6
Item 1A.	RISK FACTORS	26
Item 1B.	UNRESOLVED STAFF COMMENTS	56
Item 1C.	CYBERSECURITY	56
Item 2.	PROPERTIES	57
Item 3.	LEGAL PROCEEDINGS	57
Item 4.	MINE SAFETY DISCLOSURE	57
PART II
Item 5.	MARKET FOR THE REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES	58
Item 6.	[RESERVED]	59
Item 7.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	60
Item 7A.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	71
Item 8.	FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA	72
Item 9.	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE	108
Item 9A.	CONTROLS AND PROCEDURES	108
Item 9B.	OTHER INFORMATION	110
Item 9C.	DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS	110
PART III
Item 10.	DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE	111
Item 11.	EXECUTIVE COMPENSATION	111
Item 12.	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS	111
Item 13.	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE	111
Item 14.	PRINCIPAL ACCOUNTANT FEES AND SERVICES	111
PART IV
Item 15.	EXHIBIT AND FINANCIAL STATEMENT SCHEDULES	112
Item 16.	FORM 10-K SUMMARY	117
	SIGNATURES	118

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FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, which are subject to a number of risks and uncertainties. All statements that are not historical facts are forward-looking statements, including statements about sales of HEPLISAV-B®, our ability to successfully commercialize HEPLISAV-B, CpG 1018 adjuvant or any future product, our anticipated market opportunity and level of sales of HEPLISAV-B and CpG 1018 adjuvant, our ability to manufacture sufficient supply of HEPLISAV-B to meet future demand, our business, collaboration and regulatory strategy, our ability to successfully support the development, manufacture and commercialization of other vaccines containing our CpG 1018 adjuvant, including any current or potential vaccine or vaccine candidate that stems from any of our collaborations, our ability to manufacture sufficient supply of CpG 1018 adjuvant to meet potential future demand in connection with new vaccines, our ability to advance our other product candidates, such as our shingles, Tdap and plague programs, and to otherwise develop and expand our clinical research pipeline, meet regulatory requirements, including post-marketing obligations and commitments, uncertainty regarding our capital needs and future operating results and profitability, anticipated sources of funds, liquidity and cash needs (including our ability to collect on accounts receivables), anticipated future revenue, as well as our plans, objectives, strategies, expectations and intentions for our business. These statements appear throughout this Annual Report on Form 10-K and can be identified by the use of forward-looking language such as “may,” “will,” “should,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “future,” or “intend,” or the negative of these terms or other variations or comparable terminology. In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this Annual Report on Form 10-K, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements.

Actual results may vary materially from those in our forward-looking statements as a result of various factors that are identified in “Item 1A—Risk Factors” and “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in this Annual Report on Form 10-K. No assurance can be given that the risk factors described in this Annual Report on Form 10-K are all of the factors that could cause actual results to vary materially from the forward-looking statements. All forward-looking statements speak only as of the date of this Annual Report on Form 10-K. Readers should not place undue reliance on these forward-looking statements and are cautioned that any such forward-looking statements are not guarantees of future performance. We assume no obligation to update any forward-looking statements after the date they are made.

This Annual Report on Form 10-K includes trademarks and registered trademarks of Dynavax Technologies Corporation. Products or service names of other companies mentioned in this Annual Report on Form 10-K may be trademarks or registered trademarks of their respective owners. References herein to “we,” “our,” “us,” “Dynavax” or the “Company” refer to Dynavax Technologies Corporation and its subsidiaries.

RISK FACTOR SUMMARY

Below is a summary of material factors that make an investment in our securities speculative or risky. Importantly, this summary does not address all of the risks and uncertainties that we face. Additional discussion of the risks and uncertainties summarized in this risk factor summary, as well as other risks and uncertainties that we face, can be found in the more detailed discussion that follows this summary, and the below summary is qualified in its entirety by that more complete discussion of such risks and uncertainties. You should carefully consider the risks and uncertainties described herein as part of your evaluation of an investment in our securities:

•HEPLISAV-B has been approved in the United States, the European Union and Great Britain and launched in the United States and Germany, and there is significant competition in these marketplaces. Since this is our first marketed product, the timing of uptake and distribution efforts are unpredictable and there is a risk that we may not achieve and sustain commercial success for HEPLISAV-B.

•Our financial results may vary significantly from quarter to quarter or may fall below the expectations of investors or securities analysts, each of which may adversely affect our stock price.

•We have incurred annual net losses in most years since our inception and could continue to incur significant losses if we do not successfully commercialize HEPLISAV-B, launch new products and/or significant sales of our CpG 1018 adjuvant do not resume. Until we are able to generate significant revenues or achieve profitability

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through product sales on a consistent basis, we may require substantial additional capital to finance our operations.

•Many of our competitors have greater financial resources and expertise than we do. If we are unable to successfully compete with existing or potential competitors as a result of these disadvantages, we may be unable to generate sufficient, or any, revenues and our business will be harmed.

•We rely on our facility in Düsseldorf, Germany and third parties to supply materials or perform processes necessary to manufacture our products and our product candidates. We rely on a limited number of suppliers to produce the oligonucleotides we require for development and commercialization. Additionally, we have limited experience in manufacturing our products or product candidates in commercial quantities. With respect to HEPLISAV-B, we use a pre-filled syringe presentation of the vaccine and our ability to meet future demand will depend on our ability to manufacture or have manufactured sufficient supply in this presentation.

•As we continue to focus on the commercialization of our HEPLISAV-B vaccine and our CpG 1018 adjuvant, we may encounter difficulties in managing our commercial growth and expanding our operations successfully.

•As we continue to grow as a commercial organization and enter into supply agreements with customers, those supply agreements will have obligations to deliver product that we are reliant upon third parties to manufacture on our behalf.

•We face uncertainty regarding coverage, pricing and reimbursement and the practices of third-party payors, which may make it difficult or impossible to sell certain of our products or product candidates on commercially reasonable terms.

•We are subject to ongoing United States Food and Drug Administration (“FDA”), EU and comparable foreign post-marketing obligations concerning HEPLISAV-B, which may result in significant additional expense, and we may be subject to penalties if we fail to comply with regulatory requirements or experience unanticipated regulatory issues with HEPLISAV-B. If HEPLISAV-B or any products we develop are not accepted by the market or if regulatory authorities limit our labeling indications, require labeling content that diminishes market uptake of HEPLISAV-B or any other products we develop, or limit our marketing claims, we may be unable to generate significant future revenues, if any.

•HEPLISAV-B and all of our clinical programs rely on oligonucleotide toll-like receptor (“TLR”) agonists. In the event of serious adverse events relating to TLR agonists, we may be required to reduce the scope of, or discontinue, our operations, or reevaluate the viability of strategic alternatives.

•HEPLISAV-B is subject to regulatory obligations and continued regulatory review, and if we receive regulatory approval for our other product candidates, we will be subject to ongoing FDA and foreign regulatory obligations and continued regulatory review for such products.

•Regulatory authorities may require more clinical trials for our product candidates than we currently expect or are conducting before granting regulatory approval, if regulatory approval is granted at all. Our clinical trials may be extended which may lead to substantial delays in the regulatory approval process for our product candidates and may impair our ability to generate revenues.

•Clinical trials for our commercial product and product candidates are expensive and time consuming, may take longer than we expect or may not be completed at all, and have uncertain outcomes.

•A key part of our business strategy for products in development is to establish collaborative relationships to help fund or manage development and commercialization of our product candidates and research programs. We may not succeed in establishing and maintaining collaborative relationships, which may significantly limit our ability to continue to develop and commercialize those products and programs, if at all.

•As we plan for the broader commercialization of our HEPLISAV-B vaccine and for the requisite capacity to manufacture our CpG 1018 adjuvant, our financial commitments for manufacturing and supply capacity might outpace actual demand for our products.

•We may develop, seek regulatory approval for and market HEPLISAV-B or any other product candidates outside of the U.S., the European Union and Great Britain, requiring a significant additional commitment of resources. Failure to successfully manage our international operations could result in significant unanticipated costs and delays in regulatory approval or commercialization of our products or product candidates.

•We rely on clinical research organizations (“CROs”) and clinical sites and investigators for our clinical trials. If these third parties do not fulfill their contractual obligations or meet expected deadlines, our planned clinical

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trials may be delayed and we may fail to obtain the regulatory approvals necessary to commercialize our product candidates.

•As a biopharmaceutical company, we engage CROs to conduct clinical studies, and failure by us or our CROs to conduct a clinical study in accordance with good clinical practices (“GCP”) standards and other applicable regulatory requirements could result in disqualification of the applicable clinical trial from consideration in support of approval of a potential product.

•If third parties assert that we have infringed their patents or other proprietary rights or challenge our patents or other proprietary rights, we may become involved in disputes and litigation that would be costly, time consuming and have a negative impact on the commercialization of our current products and delay or prevent development or commercialization of our product candidates.

•Our stock price is subject to volatility, and your investment may suffer a decline in value.

•Future sales of our common stock or the perception that such sales may occur in the public market could cause our stock price to fall.

•Servicing our debt requires a significant amount of cash, and we may not have sufficient cash flow from our business to pay our substantial debt. Conversion of the Convertible Notes (defined below) may dilute the ownership interest of our stockholders or may otherwise depress the price of our common stock.

•The loss of key personnel could delay or prevent achieving our objectives. In addition, our continued growth to support commercialization may result in difficulties in managing our growth and expanding our operations successfully.

•If our information technology systems or those of third parties upon which we rely, or our data are or were compromised, we could experience adverse consequences resulting from such compromise, including but not limited to regulatory investigations or actions; litigation; fines and penalties; disruptions of our business operations; reputational harm; loss of revenue or profits; and other adverse consequences.

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PART I

ITEM 1. BUSINESS

OUR COMPANY

We are a commercial stage biopharmaceutical company dedicated to developing and commercializing innovative vaccines in areas of significant unmet need, leveraging our demonstrated expertise and capabilities in vaccines and our proven, proprietary vaccine adjuvant technology. We are currently focused on our efforts to drive long-term shareholder value by maximizing utilization of our HEPLISAV-B® hepatitis B vaccine, expanding our own portfolio of innovative vaccine candidates leveraging our proven adjuvant technology, and leveraging our CpG 1018® adjuvant supply strategy through both commercial and research collaborations.

HEPLISAV-B [Hepatitis B Vaccine (Recombinant), Adjuvanted]

Our first marketed product, HEPLISAV-B [Hepatitis B Vaccine (Recombinant), Adjuvanted], is approved in the United States, the European Union and Great Britain for prevention of infection caused by all known subtypes of hepatitis B virus ("HBV") in adults aged 18 years and older. HEPLISAV-B is the only two-dose hepatitis B vaccine for adults approved in the United States, the European Union and Great Britain. In Phase 3 trials, HEPLISAV-B demonstrated faster and higher rates of protection with two doses in one month compared to other currently approved hepatitis B vaccines, which require three doses over six months, with similar safety profiles. We received marketing authorization approval of HEPLISAV-B in February 2021 from the European Commission for prevention of infection caused by all known subtypes of HBV in adults aged 18 years and older. In May 2021, we entered into a commercialization agreement with Bavarian Nordic for the marketing and distribution of HEPLISAV-B in Germany, and in May 2022, we commenced commercial shipments of HEPLISAV-B in Germany. In March 2023, we received marketing authorization in Great Britain for HEPLISAV-B for the active immunization against hepatitis B virus infection caused by all known subtypes of hepatitis B virus in adults aged 18 years and older.

Pipeline Programs

We are advancing a pipeline of differentiated product candidates that leverage our CpG 1018 adjuvant to develop improved vaccines in indications with unmet medical needs. These programs include vaccine candidates under development for shingles, Tdap and plague.

•Shingles vaccine program: Z-1018 is an investigational vaccine candidate being developed for the prevention of shingles in adults aged 50 and older.

•Tdap vaccine program: Tdap-1018 is an investigational vaccine candidate intended for active booster immunization against tetanus, diphtheria, and pertussis ("Tdap").

•Plague vaccine program: We are developing a plague (rF1V) vaccine candidate adjuvanted with CpG 1018, currently in a Phase 2 clinical trial in collaboration with, and fully funded by, the U.S. Department of Defense ("DoD").

Additionally, we manufacture and have supplied in the past CpG 1018 adjuvant, the adjuvant used in HEPLISAV-B, through both commercial supply agreements and preclinical and clinical research collaborations with third-party organizations.

Adjuvant Technology Overview: Toll-like Receptor Immune Modulation Platform

Toll-like receptors (TLRs) are a family of transmembrane proteins that play a vital role in innate immunity and subsequent adaptive immunity. Signaling through these receptors is triggered by the binding of a variety of pathogen-associated molecules and is essential to generation of innate immunity. The innate immune response is the first line of defense against viruses, bacteria and other potential pathogens. Importantly, the innate response initiates and regulates the generation of an adaptive immune response composed of highly specific antibodies and T cells. Compounds used in vaccine products that stimulate enhanced immune responses are generally referred to as adjuvants.

Our work in this area has been focused primarily on stimulation of a subset of TLRs that recognize bacterial and viral nucleic acids. This work resulted in the identification of proprietary unmethylated synthetic oligonucleotides (short segments of deoxyribonucleic acid (DNA)), that mimic the activity of microbial DNA, and selectively activate one of these important receptors, TLR9. These TLR9 agonists are called CpG oligonucleotides – or “CpGs” for short – referring to the presence of specific nucleotide sequences containing the CG base pair.

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Our vaccine research to date has focused on the use of TLR9 agonists as novel vaccine adjuvants. B-Class TLR9 agonists, such as our CpG 1018 adjuvant, stimulate release of cytokines necessary for T cell activation establishing long-term immunity. TLR9 stimulation particularly helps generate Th1 immune responses that are important to control pathogens such as viruses and bacteria. As a result, TLR9 adjuvanted vaccines induce a specific Th1 immune response and more durable levels of protective antibodies relative to non-adjuvanted vaccines. Our CpG 1018 adjuvant has an established tolerability profile demonstrated in a wide range of clinical trials and real-world, commercial use, and has consistently demonstrated its ability to enhance the immune response without excessive reactogenicity as shown in multiple clinical trials in our HEPLISAV-B and COVID-19 vaccine collaboration programs.

Key 2023 Business and Financial Highlights

Drive Growth of HEPLISAV-B [Hepatitis B Vaccine (Recombinant), Adjuvanted]

HEPLISAV-B vaccine is the first and only adult hepatitis B vaccine approved in the U.S. and EU that enables series completion with only two doses in one month. Hepatitis B vaccination is universally recommended for adults aged 19-59 in the U.S.

•We recognized $213.3 million of HEPLISAV-B product revenue in the U.S. during the year ended December 31, 2023, representing a 69% increase compared to the year ended December 31, 2022. This increase was primarily driven by an increase in HEPLISAV-B demand and market share gains in the U.S. in 2023, compared to 2022.

•HEPLISAV-B estimated total market share in the U.S. increased to approximately 42%, compared to approximately 35% at the end of 2022.

•HEPLISAV-B estimated market share in the retail pharmacy segment increased to approximately 58%, compared to approximately 42% at the end of 2022. HEPLISAV-B estimated market share in the Integrated Delivery Networks ("IDNs") and Large Clinics segment increased to approximately 56%, compared to approximately 47% at the end of 2022.

•A supplemental Biologic License Application ("sBLA") for HEPLISAV-B vaccination of adults on hemodialysis is currently under priority review by the FDA with a Prescription Drug User Fee Act action date planned for May 13, 2024.

•Actively leveraging on the CDC's Advisory Committee on Immunization Practices ("ACIP") recommendation for hepatitis B vaccination in adults, which was published in April 2022, advising that all adults aged 19-59 should be vaccinated against hepatitis B. We believe this will help enable a significantly expanded total annual market opportunity of approximately $800 million in the U.S. by 2027, with HEPLISAV-B well positioned to achieve a majority market share.

Advance Clinical Pipeline Leveraging our Proven Adjuvant Technology

We are advancing a pipeline of product candidates that leverage our CpG 1018 adjuvant, which has demonstrated its ability to enhance the immune response with a favorable tolerability profile in a wide range of clinical trials and real-world commercial use.

Shingles vaccine program:

•We recently received Type B meeting feedback from the FDA on the Z-1018 clinical development plan and submitted an Investigational New Drug Application ("IND") to the FDA to support the initiation of a Phase 1/2 trial of Z-1018, upon IND clearance, in the first half of 2024.

Tdap vaccine program:

•We recently received Type B meeting feedback from the FDA on the Tdap-1018 clinical development plan. We plan to submit an IND to the FDA to support the initiation of the Phase 2 human challenge study of Tdap-1018 in the second half of 2024, upon completion of the independent study being conducted by the Canadian Center for Vaccinology to establish the human challenge dose, which we will utilize in our Phase 2 study.
 

Plague vaccine candidate:

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•We anticipate top line data for the randomized, active-controlled Phase 2 clinical trial evaluating immunogenicity, safety, and tolerability of the plague vaccine candidate in 2024.

Corporate and Financial Highlights

•We recognized $213.3 million of HEPLISAV-B vaccine net product revenue during the year ended December 31, 2023, representing 69% growth compared to 2022.

•We generated $100.6 million in cash from operating activities during the year ended December 31, 2023 and ended the year with $742.3 million in cash and cash equivalents, and marketable securities.

•We reported a net loss of $6.4 million during the year ended December 31, 2023.

•We did not recognize CpG 1018 adjuvant net product revenue during the year ended December 31, 2023, as we completed all obligations and product delivery under our CpG 1018 adjuvant collaboration agreements as of December 31, 2022.

Our Strategy

Our vision is to continue building a leading vaccines company dedicated to developing and commercializing innovative vaccines in areas of significant unmet need, leveraging our demonstrated expertise and capabilities in vaccines and our proven, proprietary vaccine adjuvant technology. Our strategy is focused on our core priorities: drive growth in our HEPLISAV-B commercial vaccine, advance a differentiated vaccine pipeline, and identify strategic opportunities to accelerate growth. Key elements of our strategy include:

•Increase our HEPLISAV-B vaccine market share to become the market leader in the future;

•Maximize total addressable HEPLISAV-B vaccine market based on the ACIP Universal Recommendation;

•Leverage HEPLISAV-B vaccine as a foundational commercial asset to support company growth and pipeline development;

•Deliver on our innovative and diversified pipeline leveraging CpG 1018 adjuvant with proven antigens;

•Build an adult vaccine portfolio of best-in-class products;

•Advance innovative pre-clinical and discovery efforts leveraging collaborations;

•Continue disciplined allocation of capital aligned with corporate strategy to deliver long-term value through internal and external innovation; and

•Pursue external opportunities to further leverage our U.S. commercial vaccine capabilities, prioritizing first or best-in-class assets.

HEPLISAV-B [Hepatitis B Vaccine, (Recombinant), Adjuvanted]

Our first commercial product, HEPLISAV-B [Hepatitis B Vaccine, (Recombinant), Adjuvanted], is approved by the FDA, the European Commission and the UK Medicines and Healthcare products Regulatory Agency for prevention of infection caused by all known subtypes of HBV in adults aged 18 years and older. HEPLISAV-B combines CpG 1018 adjuvant, our proprietary TLR9 agonist adjuvant, and recombinant hepatitis B surface antigen (“rHBsAg” or “HBsAg”) that is manufactured by Dynavax GmbH, our wholly owned subsidiary, in Düsseldorf, Germany. HEPLISAV-B and each of the vaccines it directly competes against use rHBsAg to elicit an immune response to the virus.

About Hepatitis B

Hepatitis B is a potentially life-threatening liver infection caused by the hepatitis B virus (HBV). It is a major global health problem. It can cause chronic infection and puts people at high risk of death from cirrhosis and liver cancer. The World Health Organization (“WHO”) and the CDC have set a goal to eliminate all viral hepatitis infections, including hepatitis B, globally by 2030, and are calling for a continued commitment to increase services to eliminate hepatitis. The WHO estimates that worldwide, approximately 296 million people were living with chronic hepatitis B in 2019, and that in the same year hepatitis B resulted in and estimated 820,000 deaths primarily from liver cancer. In addition, the CDC estimated that in 2020 approximately 580,000 to 1.2 million people in the U.S. were living with HBV infection. There was a

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total of 2,157 new cases of acute hepatitis B reported to the CDC in 2020. However, after adjusting for under-ascertainment and under reporting, the CDC estimated that 14,000 acute hepatitis B cases occurred in the U.S. in 2020.

Recommendations for Adult Vaccination to Prevent Hepatitis B

The CDC’s ACIP unanimously voted at its November 2021 meeting to recommend that all adults 19 to 59 years of age should receive a hepatitis B vaccination, and such recommendation was published in April 2022. This universal recommendation greatly simplifies the identification of patients who need a hepatitis B vaccine compared to the previous risk-based recommendation, and significantly expands the number of adults in the United States who should be vaccinated against hepatitis B under the CDC recommendation.

This recommendation is a significant milestone for hepatitis B prevention, making hepatitis B the fifth vaccine routinely recommended for adult immunization along with influenza, shingles, Tdap and pneumococcal. Based on this opportunity, we launched a series of innovative marketing campaigns targeting consumers and healthcare providers to increase the awareness of HEPLISAV-B as the only two-dose hepatitis B vaccine option, with broad protection across most patient types. Such efforts have driven an increase in HEPLISAV-B demand and market share in the U.S. in 2023 compared to 2022.

Protection Against Hepatitis B by HEPLISAV-B

The approval of HEPLISAV-B by the FDA was based on data from three Phase 3 non-inferiority trials involving nearly 10,000 adult participants who received HEPLISAV-B. These pivotal studies compared HEPLISAV-B administered in two doses over one month to Engerix-B® administered in three doses over a six-month schedule. Results from HBV-23, the largest Phase 3 trial, which included 6,665 participants, showed that HEPLISAV-B demonstrated a statistically significantly higher rate of protection of 95% compared with 81% for Engerix-B. Across the three clinical trials, the most common local reaction was injection site pain (23% to 39%). The most common systemic reactions were fatigue (11% to 17%) and headache (8% to 17%).

We have worldwide commercial rights to HEPLISAV-B. In addition to HEPLISAV-B, there are four other vaccines approved for the prevention of hepatitis B in the U.S.: Engerix-B and Twinrix® from GlaxoSmithKline plc (GSK), Recombivax-HB® from Merck & Co. (“Merck”) and PreHevbrio™ from VBI Vaccines Inc. HEPLISAV-B is currently approved in the U.S., the EU and Great Britain for the prevention of hepatitis B in adults. We are also considering additional territories where it would be commercially feasible to market HEPLISAV-B.

The largest segments of the market are concentrated in independent hospitals and clinics, integrated delivery networks, dialysis centers, public health clinics and prisons, the Departments of Defense and Veterans Affairs and retail pharmacies. Our promotional activity is focused on the largest accounts in each segment. Our field sales force of approximately 117 people are targeting customers that we believe have the highest impact on adult hepatitis B vaccine utilization in the U.S. We deploy our sales force to the physician or pharmacist level, as well as at the procurement level within respective healthcare segments where vaccines are utilized. Our primary objectives are to both increase market share, as well as increase market size over time.

We continue to explore ways to enhance the clinical profile of HEPLISAV-B. We completed an open-label, single-arm study of a 4-dose regimen of HEPLISAV-B in adults with end-stage renal disease who are initiating or undergoing hemodialysis. Final immunogenicity results included a seroprotection rate of 89.3% with high levels of anti-HBs antibodies. Safety data showed HEPLISAV-B was well tolerated and no safety concerns were observed. The safety and effectiveness of HEPLISAV-B in adults on hemodialysis have not yet been established. This study alone, regardless of results, may not be sufficient to support a label change to include dialysis patients. If we do receive approval of this dosing schedule, we expect to add dialysis centers to our personal promotion efforts. An sBLA for HEPLISAV-B vaccination of adults on hemodialysis is currently under priority review by the FDA with a Prescription Drug User Fee Act action date planned for May 13, 2024.

CpG 1018 Vaccine Adjuvant

We believe the favorable immunogenicity and safety results achieved with HEPLISAV-B utilizing our CpG 1018 adjuvant support our efforts to develop it as a broadly useful vaccine adjuvant platform. CpG 1018 adjuvant has an established profile for the potential development of safe and effective vaccines. It has a well-defined mechanism of action, targeting select immune system cells, with well-characterized effects on the immune response that mimic the immune response to naturally occurring TLR9 agonists in pathogens. This results in potent adjuvant activity for antibody responses. In HEPLISAV-B, our CpG 1018 adjuvant is believed to drive faster and consistently higher rates of seroprotection than

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Engerix-B, even in the elderly and populations known to be less responsive to other vaccines. CpG 1018 adjuvant differentially elicits a preferred T Helper 1 (Th1) cell polarized response and drives protective antibody production. CpG 1018 adjuvant has a large safety database that indicates a favorable reactogenicity profile with lower reactogenicity compared to other adjuvants.

We have established several clinical and preclinical collaborations with vaccine developers to evaluate CpG 1018 adjuvanted vaccine product candidates against influenza, other infectious diseases, and particularly COVID-19 across a variety of vaccine platforms. Data from studies in non-human primates demonstrate our CpG 1018 adjuvant can elicit a robust immune response to COVID-19 and protect animals from disease in challenge studies. Results from Phase 2 and 3 human clinical studies demonstrated vaccines utilizing CpG 1018 adjuvant had a favorable safety and tolerability profile, induced strong immune responses, including neutralizing antibodies and Th1-biased cell-mediated immunity, and resulted in a high efficacy against COVID-19 disease.

Our Vaccine Research and Development Pipeline

We are building an innovative pipeline of investigational vaccine product candidates, leveraging our proven, proprietary vaccine adjuvant technology. A summary of our pipeline programs follows:

Shingles Vaccine Program

Shingles is an extremely painful consequence of the reactivation of a latent varicella-zoster virus (“VZV”) infection, with attacks leading to potential complications including chronic pain. The current shingles vaccine market is approximately $4 billion and expected to grow over time. Our CpG 1018 adjuvant has demonstrated its ability to enhance the immune response without excessive reactogenicity in both HEPLISAV-B and multiple COVID-19 clinical trials. Importantly, CpG 1018 adjuvant has shown the ability to generate high levels of CD4+-cells which have been demonstrated to be key cell types in controlling latent VZV infection to avoid reactivation leading to shingles, with potentially lower reactogenicity compared to the current standard of care.

In January 2022, we initiated a Phase 1 clinical trial of our shingles vaccine candidate, utilizing our CpG 1018 adjuvant. The global Phase 1 study was designed to evaluate safety, tolerability and immunogenicity of the vaccine candidate which is comprised of glycoprotein E (gE) plus CpG 1018 adjuvant.

In January 2023, we announced the completion of a randomized Phase 1 clinical trial of our shingles vaccine program evaluating the safety, tolerability, and immunogenicity in adults. At four weeks following the 2-dose regimen, the investigational shingles vaccine Z-1018 demonstrated high antibody and CD4 positive T-cell vaccine response rates in all arms, which were similar to the licensed comparator. Robust increases in CD4 positive T-cells were observed in all Z-1018 arms, although lower than the comparator. Total frequency of solicited systemic adverse events and local post-injection reactions and moderate and severe reactions were similar across the Z-1018 arms and lower than the comparator.

In June 2023, we presented results from a Phase 1 randomized, active-controlled, dose escalation, multicenter trial to evaluate the safety, tolerability, and immunogenicity of Z-1018, at the National Foundation for Infectious Diseases’ 2023 Annual Conference on Vaccinology Research. These results demonstrate the opportunity to develop a shingles vaccine with improved vaccine tolerability and comparable efficacy to Shingrix and support the continued development of our shingles vaccine candidate. We received Type B meeting feedback from the FDA on the Z-1018 clinical development plan and submitted an IND to the FDA to support the initiation of a Phase 1/2 trial of Z-1018, upon IND clearance, in the first half of 2024.

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Tdap Vaccine Program

Pertussis (whooping cough) is a serious illness in people of all ages and can be life-threatening, especially in infants. Whooping cough is caused by the highly contagious respiratory bacterium, Bordetella pertussis. People with pertussis usually spread the disease to others by coughing, sneezing or spending time in the same breathing environment. According to the CDC, there are an estimated 24.1 million cases of pertussis and about 160,700 deaths per year globally. The resurgence of B. pertussis in multiple countries has been attributed to the Tdap vaccine’s limited duration of protection. Our Tdap booster vaccine candidate adjuvanted with CpG 1018 is anticipated to improve the durability of protection against pertussis by redirecting T cell responses and enhancing protective antibody responses in a booster vaccine.

In June 2017, we entered into an agreement with Serum Institute of India Pvt. Ltd. ("SIIPL") to collaborate on development and commercialization of certain potential vaccines including Tdap booster adjuvated with CpG 1018. Under the collaboration, we have exclusive worldwide rights to commercialize the vaccine, except that SIIPL has exclusive rights to distribute in India and to fulfill WHO/United Nations Children's Fund (UNICEF) tender contracts. Each party is responsible for clinical development cost in their respective territories.

In October 2022, we presented adult and adolescent safety data from the Phase 1 clinical trial of Tdap-1018, which was well tolerated with no safety concerns observed. Additionally, immunogenicity levels in adults met our expectations and support our plan to continue advancement of this clinical program.

In December 2023, we completed a pertussis challenge study in nonhuman primates demonstrating protection from disease upon challenge and robust Type 1 T helper (Th1) cell responses in nonhuman primates vaccinated with Tdap-1018. We recently received Type B meeting feedback from the FDA on the Tdap-1018 clinical development plan. We plan to submit an IND to the FDA to support the initiation of a Phase 2 human challenge study of Tdap-1018 in the second half of 2024, upon completion of the independent study being conducted by the Canadian Center for Vaccinology to establish the human challenge dose, which we plan to utilize in our Phase 2 study.

U.S. Department of Defense (Plague Vaccine) Phase 2 Study

In September 2021, we entered into an agreement with the U.S. Department of Defense ("DoD") for the development of a recombinant plague vaccine adjuvanted with CpG 1018 for approximately $22.0 million over two and a half years. Under the agreement, we agreed to conduct a Phase 2 clinical trial combining our CpG 1018 adjuvant with the DoD's rF1V vaccine designed to show that two doses of CpG 1018 adjuvanted vaccine administrated within a period of one month is similar to three doses of the aluminum-adjuvanted vaccine administered over a period of six months.

In August 2022, we commenced the Phase 2 clinical trial with the first participant dosed, evaluating the immunogenicity, safety and tolerability of the DoD’s rF1V vaccine combined with our CpG 1018 adjuvant, in adults 18 to 55 years of age.

In January 2023, Part 1 of the Phase 2 clinical trial evaluating the immunogenicity, safety, and tolerability in adults of a plague (rF1V) vaccine candidate adjuvanted with CpG 1018 was successfully completed. Both CpG 1018 adjuvanted arms met the Part 1 primary endpoint and demonstrated a greater than two-fold increase in antibodies over the alum adjuvanted control arm after two doses. In 2023, we completed enrollment and dosing in Part 2 of the Phase 2 clinical trial evaluating immunogenicity, safety, and tolerability. Preliminary results are expected in 2024.

In July 2023, we executed a contract modification with the DoD to support advancement of the plague vaccine candidate into a nonhuman primate challenge study, which was initiated in August 2023, with the agreement now totaling $33.7 million through 2025.

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CpG 1018 Adjuvant Supply Partnerships for COVID-19 Vaccine Development

To support the fight against COVID-19, we collaborated with five other organizations on their development of COVID-19 vaccines, by supplying them with CpG 1018 adjuvant under commercial supply agreements supported by two contract manufacturing organizations, with whom we developed and implemented plans to help scale-up activities to support pandemic-level production of our CpG 1018 adjuvant as necessary to support these and any future collaborations. As of December 31, 2023, all five of our collaborators have received emergency use authorization and/or full approval for their COVID-19 vaccines, and our delivery obligations under our related supply agreements have been fully satisfied. Under our agreement (together with subsequent amendments, the "CEPI Agreement") with Coalition for Epidemic Preparedness Innovations (“CEPI”), through December 31, 2023, we received Advance Payments totaling approximately $175.0 million pursuant to the CEPI Agreement, of which $67.3 million have been repaid and $47.4 million have been forgiven. As of December 31, 2023, remaining Advance Payments totaling $60.3 million in CEPI accrual long-term were reflected in our consolidated balance sheets. We continue to work to identify other programs where CpG 1018 adjuvant can be utilized to enhance the immune response to a coronavirus vaccine or other vaccines.

For a summary of our significant CpG 1018 adjuvant collaboration agreements, see Note 9 - Collaborative Research, Development and License Agreements, in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Annual Report on Form 10-K.

INTELLECTUAL PROPERTY

Our commercial success depends in part on our ability to obtain and maintain proprietary protection for our products, product candidates, technology and know-how, to operate without infringing the proprietary rights of others and to prevent others from infringing our proprietary rights. Generally, we seek patent protection in the U.S and foreign countries on a selective basis to further protect the inventions that we or our partners consider important to the development of our business. We also rely on trade secrets and contracts to protect our proprietary information, and we rely on trademarks to protect our brand, products, product candidates, and technology.

As of December 31, 2023, our intellectual property portfolio included over 25 issued U.S. patents, over 65 granted foreign patents and over 115 additional Dynavax-solely owned or co-owned pending U.S. non-provisional and foreign patent applications claiming compositions containing TLR agonists or antagonists, methods of use, and/or methods of manufacture thereof. Specifically, our portfolio includes: (i) three issued U.S. patents related to certain uses of HEPLISAV-B that expire in 2032; (ii) 23 pending U.S. and foreign patent applications related to an investigational tetanus, diphtheria, pertussis (Tdap) booster vaccine, which are co-owned with SIIPL; (iii) 17 pending U.S. and foreign patent applications related to an investigational shingles vaccine; (iv) over 55 pending U.S. non-provisional and foreign patent applications related to COVID-19 vaccines, which include patent families that are either solely-owned or co-owned with Valneva Austria GmbH, Medigen Vaccine Biologics Corporation, or Colorado State University Research Foundation; and (v) one pending U.S. patent application related to an investigational plague vaccine, which is co-owned with The Government of the United States, as Represented by the Secretary of the Army. Lastly, some of the patents and patent applications in our portfolio relate to our discontinued immuno-oncology programs.

In general, the term of a patent extends for 20 years from the filing date of the earliest U.S. non-provisional or international (PCT) application to which priority is claimed. In certain instances, a patent term may be extended to recapture a portion of the term effectively lost as a result of the FDA regulatory review period. Moreover, in the U.S., the term of a patent may be extended as a consequence of patent office delays during prosecution. Our patent estate, based on patents existing now and expected by us to issue based on pending applications, is projected to expire on dates ranging from 2024 to 2043.

The actual protection afforded by a patent varies on a product-by-product basis, from country-to-country and depends upon many factors, including the type of patent, the scope of its coverage, the availability of regulatory related extensions, the availability of legal remedies in a particular country and the validity and enforceability of the patents.

Because patent applications in the U.S. and many foreign jurisdictions typically are not published until 18 months after filing and publications of discoveries in the scientific literature often lag behind actual discoveries, we cannot be certain that we were the first to file for protection of the inventions set forth in these patent applications or in our issued patents. Further, there could be post-grant proceedings such as inter partes review (IPR), post grant review (PGR), reexamination, reissue or opposition which could result in claims in our patents being narrowed or invalidated.

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Our commercial success depends significantly on our ability to operate without infringing patents and other proprietary rights of third parties. A number of pharmaceutical companies and biotechnology companies, as well as universities and research institutions, may have filed patent applications or may have been granted patents that cover inventions similar to the inventions owned by or licensed to us. We may not be able to determine with certainty whether patents or patent applications of other parties may materially affect our ability to make, use, offer to sell, or sell any products. If another party controls patents or patent applications covering our products, we may not be able to obtain the rights we need to those patents or patent applications in order to commercialize our products.

Litigation may be necessary to enforce patents issued or licensed to us or to determine the scope or validity of another party’s proprietary rights. The existence of third-party patent applications and patents could significantly reduce the coverage of the patents owned by or licensed to us and limit our ability to obtain meaningful patent protection. Litigation or any other proceedings could result in substantial costs to and diversion of effort by us, and an adverse outcome in a court or patent office could subject us to significant liabilities, require disputed rights to be licensed from other parties, or require us to cease using some of our technology. We may not prevail in these actions or proceedings if they arise.

In addition, other parties may duplicate, design around or independently develop similar or alternative technologies to ours or our licensors.

We may rely, in some circumstances, on trade secrets and confidentiality agreements to protect our technology. Although trade secrets are difficult to protect, wherever possible, we use confidential disclosure agreements to protect the proprietary nature of our technology. Our standard practice is to require each of our collaborators, commercial partners, employees, consultants, contractors and advisors to enter into an agreement before beginning their employment, consulting or advisory relationship with us that in general provides that the individuals must keep confidential and not disclose to other parties any of our confidential information developed or learned by the individuals during the course of their relationship with us except in limited circumstances. These agreements with employees, consultants and contractors also generally provide that we own all inventions conceived by the individuals in the course of rendering their employment or services to us. However, there can be no assurance that these agreements will not be breached, that we will have adequate remedies for any breach, or that our trade secrets and/or proprietary information will not otherwise become known or be independently discovered by competitors. To the extent that our employees, consultants or contractors use intellectual property owned by others in their work for us, disputes may also arise as to the rights in related or resulting know-how and inventions.

COMPETITION

The biotechnology and pharmaceutical industries are characterized by rapidly advancing technologies, intense competition and a strong emphasis on proprietary products. Our products and development programs compete with several commercially available vaccine and adjuvant products. Many companies and institutions are making substantial investments in developing additional vaccines and adjuvants that could compete directly or indirectly with our marketed products and products under development by us and our collaborators. For example, there are multiple other shingles vaccine candidates in development including those being developed by Pfizer, BioNTech SE, Curevo Vaccine and others. The approved products from these programs will all need to compete with a single approved vaccine currently available in the U.S.

We also believe our CpG 1018 adjuvant, which we use in our own products and product candidates and provide to our collaborators through clinical and commercial supply agreements, is as or more effective than other available adjuvants and, being a yeast-derived product, is far more sustainable that other available products that are derived from, for example, shark squalene or tree bark. Regardless, there can be no guarantee that we can compete with other companies for sales of adjuvant, or any approved vaccine.

Competition for HEPLISAV-B

HEPLISAV-B, a two-dose in one month adult hepatitis B vaccine, competes directly with three-dose over six months marketed vaccines Engerix-B from GSK, as well as Recombivax-HB marketed by Merck. There are also modified schedules of conventional hepatitis B vaccines for limited age ranges that are approved in the EU, Great Britain and the U.S. In addition, HEPLISAV-B competes against Twinrix, a bivalent vaccine marketed by GSK for protection against hepatitis B and hepatitis A. Additionally, PreHevbrio, a three-dose adult hepatitis B vaccine manufactured by VBI Vaccines Inc. (“VBI”) is commercially available in multiple countries including the U.S. While we believe that HEPLISAV-B competes very well with other approved vaccines available on the market, we face significant competition in our longer term goal to capture a majority of U.S. market share. While we may explore additional territories outside of the U.S., the EU and Great Britain to market HEPLISAV-B, in doing so we will likely face competition from these or other products and competitors.

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Competition for our adjuvant supply supporting COVID-19 and our development pipeline including shingles, Tdap, plague and other potential pipeline indications

We are also in competition with companies developing vaccines, and vaccine adjuvants, generally including, among others, GSK, Pfizer, Inc., Sanofi S.A., Merck, Bavarian Nordic A/S, Emergent BioSolutions, Inc., Novavax, Inc., Medicago Inc., Valneva, AstraZeneca plc, Moderna, Inc., Johnson & Johnson and VBI.

Many of the entities developing or marketing these competing products have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals and marketing than we do. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative agreements with large, established companies with access to capital. These entities may also compete with us in recruiting and retaining qualified scientific and management personnel, as well as in acquiring technologies complementary to or necessary for our programs.

REGULATORY CONSIDERATIONS

Government Regulation

The FDA and comparable regulatory agencies in state and local jurisdictions and in foreign countries impose extensive requirements upon the clinical development, pre-market approval, manufacture, labeling, marketing, promotion, pricing, import, export, storage and distribution of biopharmaceuticals. These agencies and other regulatory agencies regulate research and development activities and the testing, approval, manufacture, quality control, safety, effectiveness, labeling, storage, recordkeeping, advertising and promotion of drugs and biologics. Failure to comply with applicable FDA or foreign regulatory agency requirements may result in warning letters, fines, civil or criminal penalties, additional reporting obligations and/or agency oversight, suspension or delays in clinical development, recall or seizure of products, partial or total suspension of production or withdrawal of a product from the market.

In the United States, the FDA regulates drug products under the Federal Food, Drug, and Cosmetic Act and its implementing regulations and biologics additionally under the Public Health Service Act. The process required by the FDA before biopharmaceuticals may be marketed in the United States generally involves the following:

•submission to the FDA of an IND, which must become effective before human clinical trials may begin and, at a minimum, must be updated annually;

•completion of extensive pre-clinical laboratory tests and pre-clinical animal studies, all performed in accordance with the FDA’s Good Laboratory Practice (“GLP”) regulations;

•performance of adequate and well controlled human clinical trials to establish the safety and efficacy of the product for each proposed indication;

•submission to the FDA of a new drug application or a biologics license application, NDA or BLA, depending on the nature of the product after completion of all pivotal clinical trials to demonstrate the safety, purity and potency of the product for the indication for use;

•a determination by the FDA to accept the application for review;

•satisfactory completion of an FDA pre-approval inspection of the manufacturing facilities to assess compliance with the FDA’s current good manufacturing practices (“cGMP”) regulations for pharmaceuticals; and

•FDA review and approval of an NDA or BLA prior to any commercial marketing or sale of the product in the United States.

The development and approval process requires substantial time, effort and financial resources, and we cannot be certain that any approvals for our product candidates, or those of our collaborators, will be granted on a timely basis, if at all.

The results of pre-clinical tests (which include laboratory evaluation as well as GLP studies to evaluate toxicity in animals) for a particular product candidate, together with related manufacturing information and analytical data, are submitted as part of an IND to the FDA. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA, within the thirty-day time period, raises concerns or questions about the conduct of the proposed clinical trial, including concerns that human research subjects will be exposed to unreasonable health risks. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. IND submissions may not result in FDA authorization to commence a clinical trial. A separate submission to an existing IND must also be made for

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each successive clinical trial conducted during product development. Further, an independent institutional review board, or IRB, for each medical center proposing to conduct the clinical trial must review and approve the plan for any clinical trial before it commences at that center and it must monitor the study until completed. The FDA, the IRB or the sponsor may suspend a clinical trial at any time on various grounds, including a finding that the subjects or patients are being exposed to an unacceptable health risk. Clinical testing also must satisfy extensive good clinical practice (“GCP”) regulations and regulations for informed consent and privacy of individually identifiable information.

Clinical Trials. For purposes of an NDA or BLA submission and approval, clinical trials are typically conducted in the following sequential phases, which may overlap:

•Phase 1. Studies are initially conducted in a limited population to test the product candidate for safety, dose tolerance, absorption, distribution, metabolism, and excretion, typically in healthy humans, but in some cases in patients.

•Phase 2. Studies are generally conducted in a limited patient population to identify possible adverse effects and safety risks, explore the initial efficacy of the product for specific targeted indications and to determine dose range or pharmacodynamics. Multiple Phase 2 clinical trials may be conducted by the sponsor to obtain information prior to beginning larger and more expensive Phase 3 clinical trials.

•Phase 3. These are commonly referred to as pivotal studies. When Phase 2 evaluations demonstrate that a dose range of the product is effective and has an acceptable safety profile, Phase 3 clinical trials are undertaken in large patient populations to further evaluate dosage, provide substantial evidence of clinical efficacy and further test for safety in an expanded and diverse patient population at multiple, geographically dispersed clinical trial centers.

•Phase 4. The FDA may approve an NDA or BLA for a product candidate, but require that the sponsor conduct additional clinical trials to further assess the product after approval under a post-marketing commitment or post- marketing requirement. In addition, a sponsor may decide to conduct additional clinical trials after the FDA has approved a product. Post-approval trials are typically referred to as Phase 4 clinical trials.

The results of product development, pre-clinical studies and clinical trials are submitted to the FDA as part of an NDA or BLA. Applications also must contain extensive manufacturing and control information. Applications must be accompanied by a significant user fee. Once the submission has been accepted for filing, the FDA’s goal is to review applications within ten months of accepting the submission or, if the application relates to an unmet medical need in a serious or life-threatening indication, eight months from accepting the submission. During the review process, the FDA often has multiple requests for information or clarifications. The review process may be extended if the FDA deems that a response contains significant new information and will require additional time beyond the period originally designated to appropriately review. The FDA will typically conduct a pre-approval inspection of the manufacturer to ensure that the product can be reliably produced in compliance with cGMPs and will typically inspect certain clinical trial sites for compliance with GCP. The FDA may refer the application to an advisory committee for review, evaluation and recommendation as to whether the application should be approved. The FDA is not bound by the recommendation of an advisory committee, but it typically follows such recommendations. The FDA may deny approval of an application by issuing a Complete Response Letter if the applicable regulatory criteria are not satisfied. A Complete Response Letter may require additional clinical data and/or trial(s), and/or other significant, expensive and time-consuming requirements related to clinical trials, pre-clinical studies or manufacturing. Approval may occur with boxed warnings on product labeling or Risk Evaluation and Mitigation Strategies, which limit the labeling, distribution or promotion of a product. Once issued, the FDA may withdraw product approval if ongoing regulatory requirements are not met or if safety problems occur after the product reaches the market. In addition, the FDA may require testing, including Phase 4 clinical trials, and surveillance programs to monitor the safety effects of approved products which have been commercialized and the FDA has the power to prevent or limit further marketing of a product based on the results of these post-marketing programs or other information.

Other Regulatory Requirements. Products manufactured or distributed pursuant to FDA approvals are subject to continuing regulation by the FDA, including recordkeeping, annual product quality review, payment of program user fees and reporting requirements. Adverse event experience with the product must be reported to the FDA in a timely fashion and pharmacovigilance programs to proactively look for these adverse events are mandated by the FDA. Manufacturers and their subcontractors are required to register their establishments with the FDA and certain state agencies are subject to periodic unannounced inspections by the FDA and certain state agencies for compliance with ongoing regulatory requirements, including cGMPs, which impose certain procedural and documentation requirements upon us and our third-party manufacturers. Failure to comply with the statutory and regulatory requirements can subject a manufacturer to possible legal or regulatory action, such as suspension of manufacturing, seizure of product, injunctive action, additional reporting

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requirements and/or oversight by the agency, import alert or possible civil or criminal penalties. The FDA may also require us to recall a product from distribution or withdraw approval for that product.

The FDA closely regulates the post-approval marketing and promotion of pharmaceuticals, including standards and regulations for direct-to-consumer advertising, dissemination of off-label information, industry-sponsored scientific and educational activities and promotional activities involving the Internet, including certain social media activities. Further, if there are any modifications to the product, including changes in indications, labeling, or manufacturing processes or facilities, we may be required to submit and obtain FDA approval of a new or supplemental application, which may require us to develop additional data or conduct additional pre-clinical studies and clinical trials. Failure to comply with these requirements can result in adverse publicity, warning letters, corrective advertising and potential administrative, civil and criminal penalties, as well as damages, fines, withdrawal of regulatory approval, the curtailment or restructuring of our operations, the exclusion from participation in federal and state healthcare programs, additional reporting requirements and/or oversight by the agency, and imprisonment, any of which could adversely affect our ability to sell our products or operate our business and also adversely affect our financial results.

Physicians may, in their independent medical judgment, prescribe legally available pharmaceuticals for uses that are not described in the product’s labeling and that differ from those tested by us and approved by the FDA. Such off-label uses are common across medical specialties. Physicians may believe that such off-label uses are the best treatment for many patients in varied circumstances. The FDA does not regulate the behavior of physicians in their choice of treatments. The FDA does, however, impose stringent restrictions on manufacturers’ communications regarding off-label use. Additionally, a significant number of pharmaceutical companies have been the target of inquiries and investigations by various U.S. federal and state regulatory, investigative, prosecutorial and administrative entities in connection with the promotion of products for off-label uses and other sales practices. These investigations have alleged violations of various U.S. federal and state laws and regulations, including claims asserting antitrust violations, violations of the Food, Drug and Cosmetic Act, false claims laws, anti-kickback laws, and other alleged violations in connection with the promotion of products for unapproved uses, pricing and Medicare and/or Medicaid reimbursement. If our promotional activities, including any promotional activities that a contracted sales force may perform on our behalf, fail to comply with these regulations or guidelines, we may be subject to warnings from, or enforcement action by, these authorities. In addition, our failure to follow FDA rules and guidelines relating to promotion and advertising may cause the FDA to issue warning letters or untitled letters, suspend or withdraw an approved product from the market, require corrective advertising or a recall or institute fines or civil fines, additional reporting requirements and/or oversight or could result in disgorgement of money, operating restrictions, injunctions or criminal prosecution, any of which could harm our business.

Outside the United States, the ability of our partners and us to market a product is contingent upon obtaining marketing authorization from the appropriate regulatory authorities. The requirements governing marketing authorization, pricing and reimbursement vary widely from country to country and region to region.

Clinical Trials in the EU. In the EU, clinical trials are governed by the Clinical Trials Regulation (EU) No 536/2014 (“CTR”), which entered into application on January 31, 2022 repealing and replacing the former Clinical Trials Directive 2001/20 (“CTD”).

The CTR is intended to harmonize and streamline clinical trial authorizations, simplify adverse-event reporting procedures, improve the supervision of clinical trials and increase transparency. Specifically, the regulation, which is directly applicable in all EU Member States, introduces a streamlined application procedure through a single-entry point, the "EU portal," the Clinical Trials Information System (“CTIS”); a single set of documents to be prepared and submitted for the application; as well as simplified reporting procedures for clinical trial sponsors. A harmonized procedure for the assessment of applications for clinical trials has been introduced and is divided into two parts. Part I assessment is led by the competent authorities of a reference Member State selected by the trial sponsor and relates to clinical trial aspects that are considered to be scientifically harmonized across EU Member States. This assessment is then submitted to the competent authorities of all concerned Member States in which the trial is to be conducted for their review. Part II is assessed separately by the competent authorities and Ethics Committees in each concerned EU Member State concerned. Individual EU Member States retain the power to authorize the conduct of clinical trials on their territory.

The extent to which on-going clinical trials will be governed by the CTR will depend on the duration of the individual clinical trial. For clinical trials in relation to which an application for approval was made on the basis of the CTD before January 31, 2023, the CTD will continue to apply on a transitional basis until January 31, 2025. By that date, all ongoing trials will become subject to the provisions of the CTR. The CTR will apply to clinical trials from an earlier date if the related clinical trial application was made on the basis of the CTR or if the clinical trial has already transitioned to the CTR framework before January 31, 2025.

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In all cases, clinical trials must be conducted in accordance with GCP and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki. Medicines used in clinical trials must be manufactured in accordance with the guidelines on cGMP and in a GMP licensed facility, which can be subject to GMP inspections.

European Union Marketing Authorization

To obtain a Marketing Authorization ("MA") for a product in the EU, an applicant must submit a Marketing Authorization Application ("MAA") either under a centralized procedure administered by the European Medicines Agency ("EMA") or one of the procedures administered by competent authorities in the EU Member States (decentralized procedure, national procedure or mutual recognition procedure). An MA may be granted only to an applicant established in the EU.

The centralized procedure provides for the grant of a single MA by the European Commission that is valid for all EU Member States. Pursuant to Regulation (EC) No 726/2004, the centralized procedure is compulsory for specific products, including for (i) medicinal products derived from biotechnological processes, (ii) products designated as orphan medicinal products, (iii) advanced therapy medicinal products ("ATMPs"), and (iv) products with a new active substance indicated for the treatment of HIV/AIDS, cancer, neurodegenerative diseases, diabetes, auto-immune and other immune dysfunctions and viral diseases. For products with a new active substance indicated for the treatment of other diseases and products that are highly innovative or for which a centralized process is in the interest of patients, the centralized procedure may be optional.

Under the centralized procedure, the EMA’s Committee for Medicinal Products for Human Use ("CHMP") is responsible for conducting the initial assessment of a product. The CHMP is also responsible for several post-authorization and maintenance activities, such as the assessment of modifications or extensions to an existing MA.

Under the centralized procedure in the EU, the maximum timeframe for the evaluation of an MAA is 210 days, excluding clock stops when additional information or written or oral explanation is to be provided by the applicant in response to questions of the CHMP. Accelerated assessment may be granted by the CHMP in exceptional cases, when a medicinal product targeting an unmet medical need is expected to be of major interest from the point of view of public health and in particular from the viewpoint of therapeutic innovation. If the CHMP accepts a request for accelerated assessment, the time limit of 210 days will be reduced to 150 days (not including clock stops). The CHMP can, however, revert to the standard time limit for the centralized procedure if it considers that it is no longer appropriate to conduct an accelerated assessment.

Unlike the centralized authorization procedure, the decentralized MA procedure requires a separate application to, and leads to separate approval by, the competent authorities of each EU Member State in which the product is to be marketed. This application is identical to the application that would be submitted to the EMA for authorization through the centralized procedure. The reference EU Member State prepares a draft assessment and drafts of the related materials within 120 days after receipt of a valid application. The resulting assessment report is submitted to the concerned EU Member States who, within 90 days of receipt, must decide whether to approve the assessment report and related materials. If a concerned EU Member State cannot approve the assessment report and related materials due to concerns relating to a potential serious risk to public health, disputed elements may be referred to the Heads of Medicines Agencies’ Coordination Group for Mutual Recognition and Decentralised Procedures – Human ("CMDh") for review. The subsequent decision of the European Commission is binding on all EU Member States.

The mutual recognition procedure allows companies that have a medicinal product already authorized in one EU Member State to apply for this authorization to be recognized by the competent authorities in other EU Member States. Like the decentralized procedure, the mutual recognition procedure is based on the acceptance by the competent authorities of the EU Member States of the MA of a medicinal product by the competent authorities of other EU Member States. The holder of a national MA may submit an application to the competent authority of an EU Member State requesting that this authority recognize the MA delivered by the competent authority of another EU Member State.

In principle, an MA has an initial validity of five years. The MA may be renewed after five years on the basis of a re-evaluation of the risk-benefit balance by the EMA or by the competent authority of the EU Member State in which the original MA was granted. To support the application, the MA holder must provide the EMA or the competent authority with a consolidated version of the eCTD (Common Technical Document) providing up-to-date data concerning the quality, safety and efficacy of the product, including all variations introduced since the MA was granted, at least nine months before the MA ceases to be valid. The European Commission or the competent authorities of the EU Member States may decide, on justified grounds relating to pharmacovigilance, to proceed with one further five year renewal period for the MA. Once subsequently

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definitively renewed, the MA shall be valid for an unlimited period. Any authorization which is not followed by the actual placing of the medicinal product on the EU market (in case of centralized procedure) or on the market of the authorizing EU Member State within three years after authorization ceases to be valid (the so-called sunset clause).

Innovative products that target an unmet medical need and are expected to be of major public health interest may be eligible for a number of expedited development and review programs, such as the Priority Medicines ("PRIME") scheme, which provides incentives similar to the breakthrough therapy designation in the U.S. PRIME is a voluntary scheme aimed at enhancing the EMA’s support for the development of medicinal products that target unmet medical needs. It permits increased interaction and early dialogue with companies developing promising medicinal products, to optimize their product development plans and speed up their evaluation to help the product reach patients earlier than normal. Product developers that benefit from PRIME designation are potentially eligible for accelerated assessment of their MAA although this is not guaranteed. Benefits accrue to sponsors of product candidates with PRIME designation, including but not limited to, early and proactive regulatory dialogue with the EMA, frequent discussions on clinical trial designs and other development program elements, and potentially accelerated MAA assessment once a dossier has been submitted.

In the EU, a “conditional” MA may be granted in cases where all the required safety and efficacy data are not yet available. The conditional MA is subject to conditions to be fulfilled for generating the missing data or ensuring increased safety measures. It is valid for one year and must be renewed annually until all related conditions have been fulfilled. Once any pending studies are provided, the conditional MA can be converted into a traditional MA. However, if the conditions are not fulfilled within the timeframe set by the EMA, the MA will cease to be renewed.

An MA may also be granted “under exceptional circumstances” where the applicant can show that it is unable to provide comprehensive data on the efficacy and safety under normal conditions of use even after the product has been authorized and subject to specific procedures being introduced. These circumstances may arise in particular when the intended indications are very rare and, in the state of scientific knowledge at that time, it is not possible to provide comprehensive information, or when generating data may be contrary to generally accepted ethical principles. Like a conditional MA, an MA granted in exceptional circumstances is reserved to medicinal products intended to be authorized for treatment of rare diseases or unmet medical needs for which the applicant does not hold a complete data set that is required for the grant of a standard MA. However, unlike the conditional MA, an applicant for authorization in exceptional circumstances is not subsequently required to provide the missing data. Although the MA “under exceptional circumstances” is granted definitively, the risk-benefit balance of the medicinal product is reviewed annually and the MA is withdrawn in case the risk-benefit ratio is no longer favorable.

In addition to an MA, various other requirements apply to the manufacturing and placing on the EU market of medicinal products. Manufacture of medicinal products in the EU requires a manufacturing authorization, and import of medicinal products into the EU requires a manufacturing authorization allowing for import. The manufacturing authorization holder must comply with various requirements set out in the applicable EU laws, regulations and guidance. These requirements include compliance with EU GMP standards when manufacturing medicinal products and active pharmaceutical ingredients ("APIs"), including the manufacture of APIs outside of the EU with the intention to import the APIs into the EU. Similarly, the distribution of medicinal products within the EU is subject to compliance with the applicable EU laws, regulations and guidelines, including the requirement to hold appropriate authorizations for distribution granted by the competent authorities of the EU Member States. MA holders and/or manufacturing and import authorization ("MIA") holders and/or distribution authorization holders may be subject to civil, criminal or administrative sanctions, including suspension of manufacturing authorization, in case of non-compliance with the EU or EU Member States’ requirements applicable to the manufacturing of medicinal products.

Data and Market Exclusivity

The EU provides opportunities for data and market exclusivity related to MAs. Upon receiving an MA, innovative medicinal products are generally entitled to receive eight years of data exclusivity and 10 years of market exclusivity. Data exclusivity, if granted, prevents regulatory authorities in the EU from referencing the innovator’s data to assess a generic application or biosimilar application for eight years from the date of authorization of the innovative product, after which a generic or biosimilar MAA can be submitted, and the innovator’s data may be referenced. The market exclusivity period prevents a successful generic or biosimilar applicant from commercializing its product in the EU until 10 years have elapsed from the initial MA of the reference product in the EU. The overall ten-year period may, occasionally, be extended for a further year to a maximum of 11 years if, during the first eight years of those ten years, the MA holder obtains an authorization for one or more new therapeutic indications which, during the scientific evaluation prior to their authorization, are held to bring a significant clinical benefit in comparison with existing therapies. However, there is no guarantee that a

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product will be considered by the EU’s regulatory authorities to be a new chemical/biological entity, and products may not qualify for data exclusivity.

In the EU, there is a special regime for biosimilars, or biological medicinal products that are similar to a reference medicinal product but that do not meet the definition of a generic medicinal product. For such products, the results of appropriate preclinical or clinical trials must be provided in support of an application for MA. Guidelines from the EMA detail the type of quantity of supplementary data to be provided for different types of biological product.

Pediatric Development

In the EU, Regulation (EC) No 1901/2006 provides that all MAAs for new medicinal products have to include the results of trials conducted in the pediatric population, in compliance with a pediatric investigation plan ("PIP") agreed with the EMA’s Pediatric Committee ("PDCO"). The PIP sets out the timing and measures proposed to generate data to support a pediatric indication of the medicinal product for which MA is being sought. The PDCO can grant a deferral of the obligation to implement some or all of the measures provided in the PIP until there are sufficient data to demonstrate the efficacy and safety of the product in adults. Further, the obligation to provide pediatric clinical trial data can be waived by the PDCO when these data are not needed or appropriate because the product is likely to be ineffective or unsafe in children, the disease or condition for which the product is intended occurs only in adult populations, or when the product does not represent a significant therapeutic benefit over existing treatments for pediatric patients. Once the MA is obtained in all EU Member States and study results are included in the product information, even when negative, the product is eligible for a six-month extension to the Supplementary Protection Certificate ("SPC") if any is in effect at the time of authorization or, in the case of orphan medicinal products, a two-year extension of orphan market exclusivity.

Post-Approval Requirements

Where an MA is granted in relation to a medicinal product in the EU, the holder of the MA is required to comply with a range of regulatory requirements applicable to the manufacturing, marketing, promotion and sale of medicinal products.

Similar to the United States, both MA holders and manufacturers of medicinal products are subject to comprehensive regulatory oversight by the EMA, the European Commission and/or the competent regulatory authorities of the individual EU Member States. The holder of an MA must establish and maintain a pharmacovigilance system and appoint an individual qualified person for pharmacovigilance who is responsible for oversight of that system. Key obligations include expedited reporting of suspected serious adverse reactions and submission of periodic safety update reports ("PSURs").

All new MAAs must include a risk management plan ("RMP") describing the risk management system that a company will put in place and documenting measures to prevent or minimize the risks associated with the product. The regulatory authorities may also impose specific obligations as a condition of the MA. Such risk-minimization measures or post-authorization obligations may include additional safety monitoring, more frequent submission of PSURs, or the conduct of additional clinical trials or post-authorization safety studies.

In the EU, the advertising and promotion of medicinal products are subject to both EU and EU Member States’ laws governing promotion of medicinal products, interactions with physicians and other healthcare professionals, misleading and comparative advertising and unfair commercial practices. Although general requirements for advertising and promotion of medicinal products are established under EU directives, the details are governed by regulations in each Member State and can differ from one country to another. For example, applicable laws require that promotional materials and advertising in relation to medicinal products comply with the product’s Summary of Product Characteristics ("SmPC") as approved by the competent authorities in connection with an MA. The SmPC is the document that provides information to physicians concerning the safe and effective use of the product. Promotional activity that does not comply with the SmPC is considered off-label and is prohibited in the EU. Direct-to-consumer advertising of prescription medicinal products is also prohibited in the EU.

Medicinal Products in the UK and Brexit. The United Kingdom’s (“UK”) withdrawal from the EU on January 31, 2020, commonly referred to as Brexit, has changed the regulatory relationship between the UK and the EU. The Medicines and Healthcare products Regulatory Agency (“MHRA”), is now the UK’s standalone regulator for medicinal products and medical devices. Great Britain (England, Scotland and Wales) is now a third country to the EU. Northern Ireland will, with regard to EU regulations, continue to follow the EU regulatory rules for now.

The UK regulatory framework in relation to clinical trials is governed by the Medicines for Human Use (Clinical Trials) Regulations 2004, as amended, which is derived from the CTD, as implemented into UK national law through secondary

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legislation. On January 17, 2022, the MHRA launched an eight-week consultation on reframing the UK legislation for clinical trials, and which aimed to streamline clinical trials approvals, enable innovation, enhance clinical trials transparency, enable greater risk proportionality, and promote patient and public involvement in clinical trials. The UK Government published its response to the consultation on March 21, 2023 confirming that it would bring forward changes to the legislation. These resulting legislative amendments will determine how closely the UK regulations will align with the CTR. In October 2023, the MHRA announced a new Notification Scheme for clinical trials which enables a more streamlined and risk-proportionate approach to initial clinical trial applications for Phase 4 and low-risk Phase 3 clinical trial applications.

Marketing authorizations in the UK are governed by the Human Medicines Regulations (SI 2012/1916), as amended. Since January 1, 2021, an applicant for the EU centralized procedure marketing authorization can no longer be established in the UK. As a result, since this date, companies established in the UK cannot use the EU centralized procedure and instead must follow one of the UK national authorization procedures or one of the remaining post-Brexit international cooperation procedures to obtain a marketing authorization to market products in the UK. All existing EU marketing authorizations for centrally authorized products were automatically converted or grandfathered into UK marketing authorization, effective in Great Britain only, free of charge on January 1, 2021, unless the marketing authorization holder opted-out of this possibility. Northern Ireland currently remains within the scope of EU authorizations in relation to centrally authorized medicinal products. Accordingly, until the Windsor Framework is implemented in Northern Ireland on January 1, 2025, products falling within the scope of the EU centralized procedure can only be authorized through UK national authorization procedures in Great Britain.

The MHRA has also introduced changes to national marketing authorization procedures. This includes introduction of procedures to prioritize access to new medicines that will benefit patients, including a 150-day assessment route, a rolling review procedure and the International Recognition Procedures which entered into application on January 1, 2024. Since January 1, 2024, the MHRA may also rely on the International Recognition Procedure (“IRP”), when reviewing certain types of marketing authorization applications. This procedure is available for applicants for marketing authorization who have already received an authorization for the same product from a reference regulator. These include the FDA, the EMA, and national competent authorities of individual EEA countries. A positive opinion from the EMA and CHMP, or a positive end of procedure outcome from the mutual recognition or decentralized procedures are considered to be authorizations for the purposes of the IRP.

Healthcare Fraud and Abuse Laws. As a pharmaceutical company, certain federal and state healthcare laws and regulations pertaining to fraud and abuse and patients’ rights may be applicable to our business. We may be subject to various federal, state and foreign laws targeting fraud and abuse in the healthcare industry. For example, in the United States, there are federal and state anti-kickback laws that prohibit the payment or receipt of kickbacks, bribes or other remuneration intended to induce the purchase or recommendation of healthcare products and services or reward past purchases or recommendations. These laws are applicable to manufacturers of products regulated by the FDA, such as us, and pharmacies, hospitals, physicians and other potential purchasers of such products.

The federal Anti-Kickback Statute prohibits persons from knowingly and willfully soliciting, receiving, offering or paying remuneration, directly or indirectly, to induce either the referral of an individual, or the furnishing, recommending, or arranging for a good 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. The term “remuneration” is defined as any remuneration, direct or indirect, overt or covert, in cash or in kind, and has been broadly interpreted to include anything of value, including for example, gifts, discounts, the furnishing of supplies or equipment, credit arrangements, payments of cash, waivers of payment, ownership interests and providing anything at less than its fair market value. Several courts have interpreted the statute’s intent requirement to mean that if any one purpose of an arrangement involving remuneration is to induce referrals of federal healthcare covered business, the statute may have been violated, and enforcement will depend on the relevant facts and circumstances. The Patient Protection and Affordable Care Act of 2010, as amended by the Health Care and Education Reconciliation Act of 2010 (collectively, the "ACA"), among other things, amended the intent requirement of the federal Anti-Kickback Statute to state that a person or entity need not have actual knowledge of this statute or specific intent to violate it in order to have committed a violation. In addition, the ACA provides that the government may assert that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the False Claims Act (discussed below) or the civil monetary penalties statute, which imposes penalties against any person who is determined to have presented or caused to be presented a claim to a federal health program that the person knows or should know is for an item or service that was not provided as claimed or is false or fraudulent, or to have offered improper inducements to federal health care program beneficiaries to select a particular provider or supplier. The federal Anti-Kickback Statute is broad, and despite a series of narrow statutory exceptions and regulatory safe harbors, prohibits many arrangements and practices that are lawful in businesses outside of the healthcare industry. Many states have also adopted laws similar to the federal Anti-Kickback Statute, some of which apply to the referral of patients for healthcare items or services reimbursed by any source, not only the Medicare and Medicaid programs, and do not contain identical safe

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harbors. In addition, where such activities involve foreign government officials, they may also potentially be subject to the Foreign Corrupt Practices Act. Because of the breadth of these laws and the narrowness of the statutory exceptions and regulatory safe harbors available, it is possible that some of our business activities, including our activities with physician customers, pharmacies, and patients, as well as our activities pursuant to partnerships with other companies and pursuant to contracts with contract research organizations, could be subject to challenge under one or more of such laws.

The federal criminal and civil false claims laws, including the False Claims Act, which prohibits any person from knowingly presenting, or causing to be presented, a false claim for payment to the federal government or knowingly making, using or causing to be made or used a false record or statement material to a false or fraudulent claim to the federal government. A claim includes “any request or demand” for money or property presented to the U.S. government. In addition, the ACA specified that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the False Claims Act. The False Claims Act has been the basis for numerous enforcement actions and settlements by pharmaceutical and other healthcare companies in connection with various alleged financial relationships with customers. In addition, a number of pharmaceutical manufacturers have reached substantial financial settlements in connection with allegedly causing false claims to be submitted because of the companies’ marketing of products for unapproved, and thus non-reimbursable, uses. Certain marketing practices, including off-label promotion, may also violate false claims laws, as might violations of the federal physician self-referral laws, such as the Stark laws, which prohibit a physician from making a referral to certain designated health services with which the physician or the physician’s family member has a financial interest and prohibit submission of a claim for reimbursement pursuant to the prohibited referral. The “qui tam” provisions of the False Claims Act allow a private individual to bring civil actions on behalf of the federal government alleging that the defendant has submitted a false claim to the federal government, and to share in any monetary recovery. In addition, various states have enacted similar fraud and abuse statutes or regulations, including, without limitation, false claims laws analogous to the False Claims Act that apply to items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor.

Separately, there are a number of other fraud and abuse laws that pharmaceutical manufacturers must be mindful of, particularly after a product candidate has been approved for marketing in the United States. For example, a federal criminal law enacted as part of, the Health Insurance Portability and Accountability Act of 1996 ("HIPAA") prohibits, among other things, knowingly and willfully executing a scheme to defraud any healthcare benefit program, including private third-party payors. The false statements statute prohibits knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false, fictitious or fraudulent statement in connection with the delivery of or payment for healthcare benefits, items or services. There are also federal and state consumer protection and unfair competition laws, which broadly regulate marketplace activities and activities that potentially harm consumers.

Healthcare Privacy and Security Laws. We may be subject to, or our marketing activities may be limited by, HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009 ("HITECH") and their respective implementing regulations, which established uniform standards for certain “covered entities” (certain healthcare providers, health plans and healthcare clearinghouses) governing the conduct of certain electronic healthcare transactions and protecting the security and privacy of protected health information. Among other things, HIPAA’s privacy and security standards are directly applicable to “business associates” — independent contractors or agents of covered entities that create, receive, maintain or transmit protected health information in connection with providing a service for or on behalf of a covered entity, as well as their covered subcontractors. In addition to possible civil and criminal penalties for violations, HITECH 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 authority to file civil actions for damages or injunctions in federal courts to enforce HIPAA and seek attorney’s fees and costs associated with pursuing federal civil actions. State laws also govern the privacy and security of health information in certain circumstances, many of which differ from each other in significant ways and may not have the same effect, thus complicating compliance efforts. Further, we are required to comply with international personal data protection laws and regulations, particularly as the result of our operations in Düsseldorf, Germany.

Privacy and Security Laws. We are subject to diverse laws and regulations relating to data privacy and security, including HIPAA in the United States, the European Union's General Data Protection Regulation ("EU GDPR") in the European Economic Area ("EEA"), and the United Kingdom's General Data Protection Regulation ("UK GDPR"). New privacy rules are being enacted in the United States and globally, and existing ones are being expanded, updated and strengthened.

For example, the EU GDPR which went into effect in May 2018 introduced strict requirements regarding the processing of personal data, which apply to non-EU entities that process, or control the processing of, the personal information of EU subjects, including clinical trial data. The EU GDPR implements more stringent operational requirements than its predecessor legislation.

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Also, in June 2018, the State of California enacted the California Consumer Privacy Act of 2018 (“CCPA”), which became effective in January 2020. The CCPA establishes a privacy framework for covered businesses, including an expansive definition of personal information and data privacy rights for California residents. The CCPA includes a framework with potentially severe statutory damages and private rights of action. The CCPA requires covered companies to provide new disclosures to California consumers (as that word is broadly defined in the CCPA), provide such consumers new ways to opt-out of certain sales of personal information, and allow for a new cause of action for data breaches.

Further, California voters approved a new privacy law, the California Privacy Rights Act ("CPRA") in the November 3, 2020 election. Effective starting on January 1, 2023, the CPRA will significantly modify the CCPA, including by expanding consumers’ rights with respect to certain sensitive personal information. The CPRA also creates a new state agency that will be vested with authority to implement and enforce the CCPA and the CPRA.

“Sunshine” and Marketing Disclosure Laws. There are an increasing number of federal and state “sunshine” laws and equivalent foreign laws that require pharmaceutical manufacturers to make reports to states and equivalent foreign authorities on pricing and marketing information. Several states and local jurisdictions and equivalent foreign laws have enacted legislation requiring pharmaceutical companies to, among other things, establish marketing compliance programs, file periodic reports with the state, make periodic public disclosures on sales and marketing activities, register pharmaceutical sales representatives, and prohibiting certain other sales and marketing practices. In addition, a similar federal requirement, known as the Physician Payments Sunshine Act, requires manufacturers, including pharmaceutical manufacturers, to track and report annually to the federal government certain payments and other transfers of value made to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors), other healthcare professionals (such as physician assistants and nurse practitioners) and teaching hospitals and information regarding ownership or investment interests held by such physicians and their immediate family members. The federal government discloses the reported information on a publicly available website. Certain states, such as Massachusetts, also make the reported information publicly available. Some foreign jurisdictions, including a number of EU Member States, impose equivalent requirements. In addition, there are state and local laws that require pharmaceutical representatives to be licensed and comply with codes of conduct, transparency reporting, and other obligations. These laws may adversely affect our sales, marketing, and other activities with respect to our products in the United States and on some foreign markets by imposing administrative and compliance burdens on us. If we fail to track and report as required by these laws or otherwise comply with these laws, we could be subject to the penalty provisions of the pertinent state and federal authorities.

Government Price Reporting. We are required to discount such products to authorized users of the Federal Supply Schedule of the General Services Administration, under which additional laws and requirements apply. These programs require submission of pricing data and calculation of discounts pursuant to complex statutory formulas, as well as the entry into government procurement contracts governed by the Federal Acquisition Regulations, and the guidance governing such calculations is not always clear. Compliance with such requirements can require significant investment in personnel, systems and resources, but failure to properly calculate our prices or offer required discounts could subject us to substantial penalties.

Penalties. Because of the breadth of these laws and the narrowness of available statutory exception and regulatory safe harbors, it is possible that some of our business activities in the United States could be subject to challenge under one or more of such laws. Moreover, state governmental agencies may propose or enact laws and regulations that extend or contradict federal requirements. If we or our operations are found to be in violation of any of the state or federal laws described above or any other governmental regulations that apply to us, we may be subject to penalties, including significant civil, criminal and administrative penalties, damages, fines, disgorgement, imprisonment, exclusion from participation in U.S. federal or state healthcare programs, additional reporting requirements and/or oversight, if subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, exclusion from participation in federal healthcare programs, contractual damages, reputational harm, diminished profits and future earnings, and the curtailment or restructuring of our operations. Any penalties, damages, fines, curtailment or restructuring of our operations could materially adversely affect our ability to operate our business and our financial results. Although compliance programs can mitigate the risk of investigation and prosecution for violations of these laws, the risks cannot be entirely eliminated. Any action against us for violation of these laws, even if we successfully defend against it, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business. Moreover, achieving and sustaining compliance with applicable federal and state privacy, security, sunshine, government price reporting, and fraud laws may prove costly.

Coverage and Reimbursement. Sales of any marketed product, in particular for HEPLISAV-B, depend, in part, on the extent to which such product will be covered by third-party payors, such as federal, state, and foreign government healthcare programs, commercial insurance and managed healthcare organizations, and the level of reimbursement for such product by third-party payors. Decisions regarding the extent of coverage and amount of reimbursement to be provided are made on a

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plan-by-plan basis. These third-party payors are increasingly reducing coverage and reimbursement for medical products, drugs and services. In addition, the U.S. government, state legislatures and foreign governments have continued implementing cost-containment programs, including price controls, restrictions on coverage and reimbursement and requirements for substitution of generic products. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit sales of any product. Decreases in third-party reimbursement for any marketed product or a decision by a third-party payor not to cover a market product could reduce physician usage and patient demand for the product and also have a material adverse effect on sales.

Impact of Healthcare Reform and Recent Public Scrutiny of Specialty Drug Pricing on Coverage, Reimbursement, and Pricing. In the United States and other potentially significant foreign markets for our products, federal and state authorities as well as third-party payors are increasingly attempting to limit or regulate the price of medical products and services, particularly for new and innovative products and therapies, which has resulted in lower average net selling prices. Further, there is increased scrutiny of prescription drug pricing practices by federal and state lawmakers and enforcement authorities. In addition, there is an emphasis on managed healthcare in the United States, which will put additional pressure on product pricing, reimbursement and usage, which may adversely affect our future product sales and results of operations. These pressures can arise from rules and practices of managed care groups, judicial decisions and governmental laws and, in the US, regulations related to Medicare, Medicaid and healthcare reform, pharmaceutical reimbursement policies and pricing in general.

For example, in Massachusetts, the MassHealth program has requested permission from the federal government to use commercial tools, such as a closed formulary, to negotiate more favorable rebate agreements from drug manufactures. There also has been particular and increasing legislative and enforcement interest in the United States with respect to specialty drug pricing practices, particularly with respect to drugs that have been subject to relatively large price increases over relatively short time periods. Such interest has resulted in several recent U.S. Congressional inquiries and proposed and enacted federal and state legislation designed to, among other things, bring more transparency to drug pricing, review the relationship between pricing and manufacturer patient programs, reduce the cost of drugs under Medicare, and reform government program reimbursement methodologies for drugs. At the federal level, in July 2021, the Biden administration released an executive order, “Promoting Competition in the American Economy,” with multiple provisions aimed at prescription drugs. In response to Biden’s executive order, on September 9, 2021, the Department of Health and Human Services ("HHS") released a Comprehensive Plan for Addressing High Drug Prices that outlines principles for drug pricing reform and sets out a variety of potential legislative policies that Congress could pursue to advance these principles. In addition, on August 16, 2022, President Biden signed the Inflation Reduction Act of 2022 (“IRA”) into law, which among other things, (1) directs HHS to negotiate the price of certain single-source drugs and biologics covered under Medicare and (2) imposes rebates under Medicare Part B and Medicare Part D to penalize price increases that outpace inflation. These provisions take effect progressively starting in fiscal year 2023, although they may be subject to legal challenges. In response to the Biden administration’s October 2022 executive order, on February 14, 2023, HHS released a report outlining three new models for testing by the Centers for Medicare & Medicaid Services Innovation Center which will be evaluated on their ability to lower the cost of drugs, promote accessibility, and improve quality of care. It is unclear whether the models will be utilized in any health reform measures in the future. 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. While march-in rights have not previously been exercised, it is uncertain if that will continue under the new framework. At the state level, legislatures have increasingly passed legislation and implemented regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. For example, on January 5, 2024, the FDA approved Florida’s Section 804 Importation Program ("SIP") proposal to import certain drugs from Canada for specific state healthcare programs. It is unclear how this program will be implemented, including which drugs will be chosen, and whether it will be subject to legal challenges in the United States or Canada. Other states have also submitted SIP proposals that are pending review by the FDA. Any such approved importation plans, when implemented, may result in lower drug prices for products covered by those programs. Additionally, in California, effective January 1, 2019, drug companies must notify insurers and government regulators of certain price increases and provide an explanation of the reasons for such increases.

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In addition, the United States, the pharmaceutical industry has already been significantly affected by major legislative initiatives, including, for example, the ACA. The ACA, among other things, imposes a significant annual fee on companies that manufacture or import branded prescription drug products. It also contains substantial provisions intended to broaden access to health insurance, reduce or constrain the growth of healthcare spending, and impose additional health policy reforms, any or all of which may affect our business.

There remain judicial, Congressional, and executive branch challenges to certain aspects of the ACA. Since January 2017, President Trump signed several Executive Orders and other directives designed to delay the implementation of certain provisions of the ACA or otherwise circumvent some of the requirements for health insurance mandated by the ACA. Concurrently, Congress 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 of 2017 (the “Tax Act”) includes a provision repealing, effective January 1, 2019, the tax-based shared responsibility payment imposed by the ACA on certain individuals who fail to maintain qualifying health coverage for all or part of a year that is commonly referred to as the “individual mandate”. On June 17, 2021 the U.S. Supreme Court dismissed a challenge on procedural grounds that argued the ACA is unconstitutional in its entirety because the “individual mandate” was repealed by Congress. Further, there have been a number of health reform measures by the Biden administration that have impacted the ACA. For example, the IRA, among other things, extends enhanced subsidies for individuals purchasing health insurance coverage in ACA marketplaces through plan year 2025. The IRA also eliminates the “donut hole” under the Medicare Part D program beginning in 2025 by significantly lowering the beneficiary maximum out-of-pocket cost and creating a new manufacturer discount program. It is possible that the ACA will be subject to judicial or Congressional challenges in the future. It is unclear how such challenges and the healthcare reform measures of the Biden administration will impact the ACA.

Other legislative changes have also been proposed and adopted since the ACA was enacted. For example, the Budget Control Act of 2011 resulted in aggregate reductions in Medicare payments to providers of up to two percent per fiscal year, starting in 2013 and, due to subsequent legislative amendments to the statute, will remain in effect until 2032 unless additional Congressional action is taken. In addition, the American Taxpayer Relief Act of 2012, among other things, reduced Medicare payments to several types of providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. Such laws, and others that may affect our business that have been recently enacted or may in the future be enacted, may result in additional reductions in Medicare and other healthcare funding.

Moreover, in the EEA some countries require the completion of additional studies that compare the cost-effectiveness of a particular medicinal product candidate to currently available therapies. This Health Technology Assessment ("HTA") process, which is currently governed by the national laws of the individual EU Member States, is the procedure according to which the assessment of the public health impact, therapeutic impact and the economic and societal impact of use of a given medicinal product in the national healthcare systems of the individual country is conducted. The outcome of HTA regarding specific medicinal products will often influence the pricing and reimbursement status granted to these medicinal products by the competent authorities of individual EU Member States. On December 15, 2021, the Health Technology Regulation (“HTA Regulation”), was adopted. The HTA Regulation is intended to boost cooperation among EU Member States in assessing health technologies, including new medicinal products, and providing the basis for cooperation at EU level for joint clinical assessments in these areas. When it enters into application in 2025, the HTA Regulation will be intended to harmonize the clinical benefit assessment of HTA across the European Union. In light of the fact that the United Kingdom has left the EU, Regulation No 2021/2282 on HTA will not apply in the United Kingdom. However, the UK Medicines and Healthcare products Regulation Agency (“MHRA”) is working with UK HTA bodies and other national organizations, such as the Scottish Medicines Consortium (“SMC”), the National Institute for Health and Care Excellence (“NICE”), and the All-Wales Medicines Strategy Group, to introduce new pathways supporting innovative approaches to the safe, timely and efficient development of medicinal products.

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MANUFACTURING

We rely on our facility in Düsseldorf, Germany and third parties to perform the multiple processes involved in manufacturing HBsAg for use in HEPLISAV-B, the combination of the oligonucleotide and the antigens, and formulation, fill and finish. As is common in our industry, in light of FDA inspection and licensing requirements for manufacturing sites, we have relied on a limited number of suppliers to produce oligonucleotides for clinical trials and conduct fill and finish operations. Historically, we relied on a single supplier to produce our CpG 1018 adjuvant for HEPLISAV-B and for our collaborators. We also have a second qualified supplier to produce CpG 1018 adjuvant for our collaboration partners, to the extent needed. Switching suppliers, or bringing on additional suppliers, could be complicated and time consuming, but we generally seek to maintain inventory to help bridge any unexpected gap in supply. In order to help us successfully manufacture and commercialize HEPLISAV-B, we have secured long-term supply agreements with the key third-party suppliers and vendors for commercial supply of our component products and finished goods. We currently manufacture the HBsAg for HEPLISAV-B at our Dynavax GmbH facility.

COMMITMENT TO COMPLIANCE AND ENVIRONMENT

We are committed to conducting our business in compliance with all applicable legal and ethical standards. In addition, we are committed to helping to protect the environment.

Our Ethics and Compliance program includes our Code of Business Conduct and Ethics (“Code”), which sets forth our expectations of all Dynavax directors, officers and employees globally that they conduct their business activities in a legal and ethical manner. The Code can be found on our website under the header “Investors” and within that under the header “Corporate Governance and Compliance.” We have a Chief Ethics and Compliance Officer, a Compliance Steering Committee and policies, procedures and training addressing specific aspects of our business, including advertising and promotion; engagements with healthcare providers; and regarding our business activities outside the United States to ensure they comply with the U.S. Foreign Corrupt Practices Act and all other applicable anti-corruption laws. We certify on an annual basis to having a comprehensive compliance program that meets the standards set forth under California law. This certification, which sets forth all of the elements of our healthcare compliance program, can be found on our website.

We also care about the environment. To that end, our headquarters is in a building certified as “Gold” level on the LEED Scorecard as set forth by the United States Green Building Committee. Our transition to a largely virtual environment has further helped reduce congestion and pollution. Our relatively small headquarters space (approximately 8,000 square feet) has further reduced our carbon footprint. In addition, we participate in our buildings active recycling program. We continue to consider other ways in which we can conduct our business in an environmentally friendly manner.

We have made, and will continue to make, expenditures for environmental compliance and protection. We do not expect that expenditures for compliance with environmental laws will have a material effect on our results of operations in the future.

HUMAN CAPITAL MANAGEMENT

As of December 31, 2023, we had 408 employees, comprised of 275 employees in the U.S., including 117 members of our field sales team located throughout the U.S., as well as 133 employees in our office and manufacturing facility in Düsseldorf, Germany. Many of our employees hold advanced degrees, including Masters degrees and Pharm.D., Ph.D., M.D. or J.D. degrees. We consider the intellectual capital of our employees to be an essential driver of our business and key to our future prospects. None of our employees is subject to a collective bargaining agreement or represented by a trade or labor union. We consider our relations with our employees to be very good.

Retention and Compensation

Our regrettable turnover rate for 2023 was 7% in the U.S. and 5% in Düsseldorf. Despite these low turnover rates, as a vaccine-focused company, we face stiff competition to hire and retain our employees. The average tenure among our employees, is 3.0 years in the U.S. and 6.2 years in Düsseldorf. We also believe that our remote-first working environment in the U.S. serves as a useful recruiting and retention tool.

We monitor our compensation programs closely and provide what we consider to be a very competitive mix of compensation and insurance benefits for all our employees, which includes base salary, annual cash bonus opportunity or semi-annual sales incentive bonus for our field sales team, comprehensive benefits package and equity compensation. Each of our employees participates in our equity programs. The annual cash bonus opportunity and equity compensation generally

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increase as a percentage of total compensation based on level of responsibility. Any actual cash bonus payout for our employees is based on a combination of our performance against corporate goals and individual performance, with the exception of any actual cash bonus payouts to our Chief Executive Officer and President which is based solely on our performance against corporate goals. The mix of equity compensation also shifts based on the level of responsibility; employees below the senior director level typically receive 100 percent of their equity compensation in restricted stock units, while more senior level employees typically receive a mix of stock options and restricted stock units. Annual equity awards to our senior leadership team include performance-based restricted stock units.

Development and Training

Attracting and retaining top talent is key to the achievement of our strategic goals. The development and engagement of our employees is also a top priority of the human resources team. We perform annual performance reviews of all employees, and we seek employee feedback in a variety of ways, including annual employee surveys. In 2023, 32 leaders and key contributors completed a leadership development program, in addition to the 30 who participated in the prior year. Our senior management and human resources team periodically undertake comprehensive organizational reviews. In addition, we have an extensive series of employee training programs on business ethics and compliance matters, including required annual trainings on our Code, our Anti-Corruption Compliance Policy and certain cybersecurity topics. Also, depending on employee roles and departments, we have employee training programs on medical affairs, commercial, sales and other matters.

In 2023, with support from our Diversity Leadership Team comprised of employees from across our company, we continued to advance our three Diversity, Equity, and Inclusion (DEI) Commitments:

•Fostering a culture where all employees are recognized and appreciated for the unique individuals they are and for their accomplishments in the workplace.

•Providing education to our employees on the negative effects of unconscious bias.
 

•Building and sustaining a team filled with a diversity of personal experiences, backgrounds, and perspectives.

In support of our three DEI Commitments, we again partnered with external DEI consultants to develop and deliver unconscious bias training to our newly hired employees in 2023. Further, we train all hiring managers and those who interview candidates in the talent acquisition process on unconscious bias. Our human resources team oversees our DEI commitments and initiatives periodically and regularly reports to our senior management, including with respect to workforce demographic data. In 2023, we launched an internal DEI survey to all U.S. based employees, such that we can gather further information on our DEI initiatives and continue to work on our DEI commitments.

2024 Initiative

In furtherance of these efforts, we identified, as one of our corporate goals for 2024, further delivery on our DEI commitments by advancing key initiatives through each of our four DEI subcommittees: Recruitment, Employee Resource Groups, Community Involvement, and Development.

CORPORATE INFORMATION & AVAILABLE INFORMATION

Our principal executive offices are located at 2100 Powell Street, Suite 720, Emeryville, California, 94608. Our telephone number is (510) 848-5100. We make available, free of charge on our website located at www.dynavax.com, our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and any amendments to those reports, as soon as reasonably practicable after filing such reports with the Securities and Exchange Commission (“SEC”). Alternatively, you may access these reports at the SEC’s website at www.sec.gov. The contents of our websites are not incorporated by reference into this Annual Report on Form 10-K or in any other report or document we file with the SEC, and any references to our websites are intended to be inactive textual references only.

ITEM 1A. RISK FACTORS

An investment in our common stock involves a high degree of risk. You should carefully consider the following risks and uncertainties, in addition to the other information contained in this Annual Report on Form 10-K, including our consolidated financial statements and related notes, before making an investment decision. The risks described below are not

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the only ones facing us. If any of the events described in the following risk factors occurs, our business, operating results and financial condition could be seriously harmed. This Annual Report on Form 10-K also contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result of factors that are described below and elsewhere in this Annual Report on Form 10-K.

Risks Related to our Business and Capital Requirements

HEPLISAV-B has been approved in the United States, the European Union and Great Britain and launched in the United States and Germany, and there is significant competition in these marketplaces. Since this is our first marketed product, the timing of uptake and distribution efforts are unpredictable and there is a risk that we may not achieve and sustain commercial success for HEPLISAV-B.

We have established sales, marketing and distribution capabilities and commercialized HEPLISAV-B in the United States and Germany. We have also received approval in the European Union and Great Britain for HEPLISAV-B. Successful commercialization of HEPLISAV-B in these regions or elsewhere will require significant resources and time, and there can be no certainty that we will succeed in these efforts. While our personnel are experienced with respect to marketing of healthcare products, because HEPLISAV-B is our first marketed product, the potential uptake of the product through distribution, and the timing, trajectory, rate and sustainability for growth in sales is unpredictable, and we may not be successful in commercializing HEPLISAV-B in the long term. In particular, successful commercialization of HEPLISAV-B will require that we continue to negotiate and enter into contracts with wholesalers, distributors, group purchasing organizations, and other parties, and that we maintain those contractual relationships. There is a risk that we may fail to complete or maintain some or all of these important contracts on favorable terms or at all, or that in a potentially evolving reimbursement environment, our efforts may fail to overcome established competition at favorable pricing, or at all.

We have continued to expand our field sales force. As these teams expand, it will take time for our expanded teams to generate significant sales momentum, if they do so at all. Although we have had some success growing and developing our field sales force following the launch of HEPLISAV-B, there is no guarantee that we will be able to generate sales at the same or improved rates going forward, if at all. In addition, retention of capable sales personnel may be more difficult for us compared to our competitors, as we focus on a single product offering. We must retain our sales force in order for HEPLISAV-B to maintain or expand its commercial presence.

Moreover, we expect that we will need to divert resources in order to successfully market, sell and distribute HEPLISAV-B for use with dialysis patients, one of our targeted patient populations. We do not yet have approval to market the regimen for dialysis. Although the Centers for Disease Control and Prevention (“CDC”) and the CDC’s Advisory Committee on Immunization Practices (“ACIP”) recommend that all adults aged 19-59, including patients on dialysis, receive hepatitis B vaccinations, our predictions of how many of those patients actually receive HEPLISAV-B may be inaccurate.

In addition to the risks with employing and maintaining our own commercial capabilities and with contracting, other factors that may inhibit our efforts to successfully commercialize HEPLISAV-B include:

•whether we are able to continue recruiting and retaining adequate numbers of effective sales and marketing personnel;

•whether we are able to access key health care providers to discuss HEPLISAV-B;

•whether we can continue to compete successfully as a relatively new entrant in established distribution channels for vaccine products; and

•whether we will maintain sufficient financial resources to cover the costs and expenses associated with sustaining a capable sales and marketing organization and related commercial infrastructure.

If we are not able to enter new markets ourselves, we may be required to collaborate or partner HEPLISAV-B with a third-party pharmaceutical or biotechnology company with existing products. To the extent we collaborate or partner, as we have done for HEPLISAV-B distribution in Germany, the product’s financial value will be shared with another party and we will need to establish and maintain a successful collaboration arrangement, and we may not be able to enter into these arrangements on acceptable terms or in a timely manner in order to establish HEPLISAV-B in these new markets. To the extent that we enter into co-promotion or other arrangements, any revenues we receive will depend upon the efforts of third parties, which may not be successful and are only partially in our control. In that event, our product revenues may be lower than if we marketed and sold our products directly with the highest priority, and we may be required to reduce or eliminate much of our commercial infrastructure and personnel as a result of such collaboration or partnership.

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Governments influence the price of medicinal products in the European Union through their pricing and reimbursement rules and control of national healthcare systems that fund a large part of the cost of those products to consumers. Even though we have been granted a marketing authorization in the European Union for HEPLISAV-B, we have yet to obtain broad reimbursements and pricing approval in any European Union Member State and rely on our distributor to do so, who currently only markets in Germany. Some jurisdictions operate positive and negative list systems under which products may only be marketed once a reimbursement price has been agreed. To obtain reimbursement or pricing approval, some of these countries may require the completion of clinical trials that compare the cost-effectiveness of a particular product candidate to currently available therapies. Other European Union Member States allow companies to fix their own prices for medicines, but monitor and control company profits. Any delay in being able to market our products in the European Union, Great Britain or elsewhere may adversely affect our business and financial condition.

If we, or our partners, are not successful in setting our marketing, pricing and reimbursement strategies, recruiting and maintaining effective sales and marketing personnel or building and maintaining the infrastructure to support commercial operations in the U.S., Germany and elsewhere, we will have difficulty successfully commercializing HEPLISAV-B, which would adversely affect our business and financial condition.

Our financial results may vary significantly from quarter to quarter or may fall below the expectations of investors or securities analysts, each of which may adversely affect our stock price.

Numerous factors, many of which are outside our control, may cause or contribute to significant fluctuations in our quarterly and annual operating results. For example, during the year ended December 31, 2022, we recognized $587.7 million of CpG 1018 adjuvant revenue. However, our CpG 1018 adjuvant supply agreements expired at the end of 2022, and as a result, we did not recognize CpG 1018 adjuvant revenue for the year ended December 31, 2023. Similarly, if demand for HEPLISAV-B decreases from recent trends for any reason, that could also cause unexpected fluctuations in our quarterly and annual operating results.

The occurrence and timing of any transfer of control of product sold to customers can also be difficult to predict, and the recognition of revenue can vary widely depending on timing of product deliveries and satisfaction of other obligations. As an example, any future revenue we do receive from sales of our CpG 1018 adjuvant has been and will continue to be difficult to predict, if it materializes at all. Historically, we generally required customers to place orders for CpG 1018 adjuvant with at least six months lead time and to make an advance payment toward the finished order. Where we receive such advance payments, we record such payments as deferred revenue until we have delivered the adjuvant and met all criteria to recognize revenue. In accordance with our stated revenue policy, we historically recorded revenue for these contracts upon meeting all of the criteria for revenue recognition under Accounting Standards Codification 606, which includes, among other criteria, the transfer of control for CpG 1018 adjuvant to our customer. During the year ended December 31, 2023, we did not receive any advanced payments from any of our customers to purchase CpG 1018 adjuvant. Our collaborators in many cases have purchase agreements with government agencies. If our collaborators do not receive payment from these agencies for any past or future adjuvant orders, our ability to collect our own receivables may be adversely affected. For example, as of December 31, 2023, we had recorded an allowance for doubtful accounts of $12.3 million in connection with our accounts receivable balance due from Bio E, which was determined by assessing changes in Bio E’s credit risk, contemplation of ongoing negotiations relating to an amendment to the supply agreement with Bio E, and Bio E’s dependence on cash collections from the Government of India, which have been delayed significantly by the Government of India.

We have in the past, and may in the future, adjust delivery dates, allow cancellations or give concessions on outstanding receivables in certain circumstances to better enable our customers to meet their obligations, which can impact the timing or amount of our revenue recognition, cash collections and transfer of control. For example, in August and October 2022, we entered into amendments to our Supply Agreement, dated June 29, 2021, with Zhejiang Clover Biopharmaceuticals, Inc. and Clover Biopharmaceuticals (Hong Kong) Co., Limited (the "Clover Supply Agreement"), which, among other things, modified the scope of the Clover Supply Agreement to reduce certain quantities of CpG 1018 adjuvant deliverable under the agreement and/or reduce amounts receivable, which we originally intended to deliver in accordance with a purchase order previously issued by Clover, and apply prepayments Clover previously made to us as payment for portions of pending outstanding purchase orders. In January 2023, we entered into another amendment to the Clover Supply Agreement to modify the price per dose of CpG 1018 adjuvant paid by Clover for adjuvant used in finished vaccine doses sold through government procurement programs relating to the booster program promoted by the China National Health Commission. In addition, in April 2023, we entered into the Bio E Amendment No. 3 and the CEPI-Bio E Assignment Agreement, pursuant to which CEPI forgave amounts outstanding relating to the Bio E CEPI Advance Payments and assumed our previous rights to collect $47.4 million of Bio E accounts receivable. Among other things, the CEPI-Bio E Assignment Agreement resulted in no accounts receivable from Bio E, the derecognition of $47.4 million CEPI accrual in connection with the Bio E CEPI Advance Payments, and certain additional future payments contingent on Bio E’s receipt of

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payments from the Government of India associated with its CORBEVAX product on or before August 15, 2025, which may not materialize.

Moreover, our revenue or operating expenses in one period may be disproportionately higher or lower relative to the others due to, among other factors, revenue fluctuations or increases in expenses as we invest in our pipeline. Accordingly, comparing our operating results on a period-to-period basis may not be meaningful, and investors should not rely on any particular past results as an indication of our future performance. If such fluctuations occur or if our operating results deviate from our expectations or the expectations of investors or securities analysts, our stock price may be adversely affected.

We have incurred annual net losses in most years since our inception and could continue to incur significant losses if we do not successfully commercialize HEPLISAV-B, launch new products and/or significant sales of our CpG 1018 adjuvant do not resume.

Prior to January 1, 2021, we had incurred losses in each year since we commenced operations in 1996. We recognized a net loss of $6.4 million for the year ended December 31, 2023. As of December 31, 2023, we had an accumulated deficit of $930.6 million.

With our investment in the launch and commercialization of HEPLISAV-B in the United States and Germany, we have in the past, and could in the future, incur operating losses. Our expenses have increased substantially as we maintain our HEPLISAV-B commercial infrastructure, including investments in internal infrastructure to support our field sales force and investments in manufacturing and supply chain commitments to maintain commercial supply of HEPLISAV-B. Further, we expect to increase research and development costs as we invest in our pipeline. We are already advancing a multi-program clinical pipeline leveraging CpG 1018 adjuvant to develop improved vaccines in indications with unmet medical needs including Phase 1 clinical trials in shingles and Tdap, and a Phase 2 clinical trial for plague in collaboration with and fully funded by the U.S. Department of Defense (“DoD”). We expect research and development costs to increase further if we add additional programs to our pipeline.

Sales of CpG 1018 adjuvant generated significant revenue during the COVID-19 pandemic, but we do not expect such revenues to continue in the long term, and we did not recognize any CpG 1018 adjuvant revenue in the year ended December 31, 2023. The timing for uptake of our products in the U.S. and abroad may further affect costs or losses related to commercialization. Due to the numerous risks and uncertainties associated with developing and commercializing vaccine products or other products we may choose to offer in the future, we are unable to predict the extent of any future losses or when, if ever, we will become profitable on an annual recurring basis, or, that if we are able to reach consistent profitability that it will be sustainable for any period of time.

Many of our competitors have greater financial resources and expertise than we do. If we are unable to successfully compete with existing or potential competitors as a result of these disadvantages, we may be unable to generate sufficient, or any, revenues and our business will be harmed.

We compete with pharmaceutical companies, biotechnology companies, academic institutions and research organizations, in developing and marketing vaccines and adjuvants. For example, HEPLISAV-B competes in the U.S. with established hepatitis B vaccines marketed by Merck, GlaxoSmithKline plc (“GSK”) and VBI Vaccines Inc. ("VBI"), and with vaccines from those companies as well as several additional established pharmaceutical companies who market abroad. There are also modified schedules of conventional hepatitis B vaccines for limited age ranges that are approved in the United States, the European Union and Great Britain. Competition in European markets could affect our success or the success of our distributor in that market as well. In addition, HEPLISAV-B competes against Twinrix, a bivalent vaccine marketed by GSK for protection against hepatitis B and hepatitis A.

We are also in competition with companies developing vaccines and vaccine adjuvants, generally including, among others, GSK, Pfizer, Inc., Sanofi S.A., Merck, Bavarian Nordic A/S, Emergent BioSolutions, Inc., Novavax, Inc., Medicago Inc., Valneva, AstraZeneca plc, Moderna, Inc., Johnson & Johnson, VBI, BioNTech SE and Curevo Vaccine. We will likely compete with several of these companies in the hepatitis space, shingles space, Tdap space and other spaces occupied by any other product candidates we ultimately choose to advance through our pipeline in the future.

Products in our clinical pipeline, if approved, will also face competition from competitors who have competing clinical programs or already approved products. Existing and potential competitors or other market participants may also compete with us for qualified commercial, scientific and management personnel, as well as for technology that would otherwise be advantageous to our business. Our success in developing marketable products and achieving a competitive position will depend, in part, on our ability to attract and retain qualified personnel in the near-term, particularly with respect to HEPLISAV-B commercialization. If we do not succeed in attracting new personnel and retaining and motivating existing

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personnel, our operations may suffer and we may be unable to properly manage our business, obtain financing as needed, enter into collaborative arrangements, advance or sell our product candidates or generate revenues.

We rely on our facility in Düsseldorf, Germany and third parties to supply materials or perform processes necessary to manufacture our products and our product candidates. We rely on a limited number of suppliers to produce the oligonucleotides we require for development and commercialization. Additionally, we have limited experience in manufacturing our products or product candidates in commercial quantities. With respect to HEPLISAV-B, we use a pre-filled syringe presentation of the vaccine and our ability to meet future demand will depend on our ability to manufacture or have manufactured sufficient supply in this presentation.

We rely on our facility in Düsseldorf and third parties to perform the multiple processes involved in manufacturing hepatitis B surface antigen for use in HEPLISAV-B, the combination of the oligonucleotide and the antigens, and formulation, fill and finish. We may continue to do the same for any additional products we might add in the future through natural internal expansion of our pipeline, or in transactions with an external third-party or parties. The FDA approved our pre-filled syringe presentation of HEPLISAV-B in 2018 and we expect such presentation will be the sole presentation for HEPLISAV-B going forward. We have limited experience in manufacturing and supplying this presentation ourselves, and rely on a contract manufacturer to do so. Our contract manufacturer is the only approved provider that we have, and there can be no assurance that we or they can successfully manufacture sufficient quantities of pre-filled syringes in compliance with good manufacturing practice ("GMP") in order to meet market demand, whether because of problems with our supplier’s own operations, operations of its sub-suppliers, issues with downstream supply chains or otherwise. If our contract manufacturer is unable to source components needed to complete fill and finish of our pre-filled syringes, we may be required to identify a second source which would have associated costs and regulatory requirements. Qualifying a second source could take more than a year to accomplish. If we are unable to do all this, on a timely basis or at all, our HEPLISAV-B sales could be materially and adversely impacted.

Historically, we have also relied on a limited number of suppliers to produce oligonucleotides for clinical trials and a single supplier to produce (i) our CpG 1018 adjuvant for manufacture of HEPLISAV-B and for sale to our collaborators and (ii) our pre-filled syringe presentation. In 2021, we qualified a second supplier to manufacture CpG 1018 adjuvant for our COVID business. If we are unable to maintain our existing suppliers for CpG 1018 adjuvant, we would have to establish an alternate qualified manufacturing capability ourselves, which would result in significant additional operating costs and delays in manufacturing HEPLISAV-B, or CpG 1018 adjuvant, and developing and commercializing our, and potentially our collaborators’, product candidates. We or other third parties may not be able to produce product at a cost, quantity and quality that are available from our current third-party suppliers, or at all.

In countries outside of the U.S., we may not be able to comply with comparable foreign regulations, and our manufacturing process may be subject to delays, disruptions or quality control/quality assurance problems. Noncompliance with these regulations or other problems with our manufacturing process may limit or disrupt the commercialization of our products or our and our collaborators’ product candidates and could result in significant expense.

As we continue to focus on the commercialization of our HEPLISAV-B vaccine and our CpG 1018 adjuvant, we may encounter difficulties in managing our commercial growth and expanding our operations successfully.

As our commercial operations expand, we expect that we will also need to manage additional relationships with various third parties, including sole source suppliers, distributors, collaboration partners, wholesalers and hospital customers. Future growth will impose significant added responsibilities on our organization, in particular on management. Our future financial performance and our ability to successfully commercialize our HEPLISAV-B vaccine and CpG 1018 adjuvant or any new products, and to compete effectively will depend, in part, on our ability to manage any future growth effectively. To that end, we may not be able to manage our growth efforts effectively, and hire, train, retain and integrate additional management, administrative and sales and marketing personnel, or secure sufficient or timely supply from third party service and product providers. Any failure to accomplish any of these activities could prevent us from successfully increasing or maintaining the same level of commercial growth as we have seen in the past.

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If HEPLISAV-B or any products we develop are not accepted by the market or if regulatory authorities limit our labeling indications, require labeling content that diminishes market uptake of HEPLISAV-B or any other products we develop, or limit our marketing claims, we may be unable to generate significant future revenues, if any.

Even if we obtain regulatory approval for our product candidates, such as our U.S., European Union and Great Britain approvals of HEPLISAV-B, and are able to commercialize them as we have with HEPLISAV-B, our products may not gain market acceptance among physicians, patients, healthcare payors and the medical community.

The degree of market acceptance of HEPLISAV-B and any of our future approved products will depend upon a number of factors, including:

•the indication for which the product is approved and its approved labeling;

•the presence of other competing approved products;

•the potential advantages of the product over existing and future treatment methods;

•the relative convenience and ease of administration of the product;

•the strength of our sales, marketing and distribution efforts;

•the price and cost-effectiveness of the product; and

•third-party coverage and adequate reimbursement and the willingness of patients to pay out-of-pocket in the absence of sufficient reimbursement by third-party payors.

The FDA or other regulatory authorities could limit the labeling indication for which our product candidates may be marketed or could otherwise limit marketing efforts for our products. If we are unable to achieve approval or successfully market any of our products or product candidates, or marketing efforts are restricted by regulatory limits, our ability to generate revenue could be significantly impaired.

As we continue to grow as a commercial organization and enter into supply agreements with customers, those supply agreements will have obligations to deliver product that we are reliant upon third parties to manufacture on our behalf.

As our commercial business begins to expand in connection with commercial sales of HEPLISAV-B or CpG 1018 adjuvant, as applicable, the contracts we enter into with our customers will generally carry delivery obligations that require us to deliver product in certain quantities and meet certain quality thresholds, among other things, all within specified timeframes. If, for any reason, whether due to reliance on third-party manufacturers or otherwise, we are unable to deliver timely, compliant products to our customers in quantities that meet our contractual obligations, we could be subject to lost revenue, contractual penalties, suits for damages, harm to our reputation or other problems that could materially and adversely affect our business. To the extent we add new products in the future, these risks could be exacerbated by the added complexity of managing multiple product lines.

We face uncertainty regarding coverage, pricing and reimbursement and the practices of third-party payors, which may make it difficult or impossible to sell certain of our products or product candidates on commercially reasonable terms.

In both domestic and foreign markets, our ability to achieve profitability will depend in part on the negotiation of a favorable price, as well as the availability of coverage and adequate reimbursement, from third-party payors, in particular for HEPLISAV-B, where existing products are already marketed. In the U.S., pricing for hepatitis B vaccines is currently stable and reimbursement is favorable as we believe private and public payors recognize the value of prophylaxis in this setting given the high costs of potential morbidity and mortality, and we have achieved coverage with most third-party payors. However, there is a risk that some payors may limit coverage to specific products on an approved list, also known as a formulary, which might not include HEPLISAV-B. Reimbursement or pricing in jurisdictions outside the U.S. may be less favorable. Thus, there can be no assurance that HEPLISAV-B will achieve and sustain stable pricing and favorable reimbursement. Even if favorable coverage and reimbursement status is attained for one or more products for which we or our collaborators receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future. Our ability to successfully obtain and retain market share and achieve and sustain profitability will be significantly dependent on the market’s acceptance of a price for HEPLISAV-B sufficient to achieve profitability, and future acceptance of such pricing.

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Third-party payors are increasingly challenging the price and cost-effectiveness of medical products and services, and pricing, as well as coverage and reimbursement decisions, may not allow our future products to compete effectively with existing competitive products. Because we intend to offer products, if approved, that involve new technologies, the willingness of third-party payors to reimburse for our products is uncertain. We will have to charge a price for HEPLISAV-B or any other products we commercialize that is sufficient to enable us to recover our considerable investment in product development and our operating costs. Further, coverage policies and third‑party reimbursement rates may change at any time. Therefore, even if favorable coverage and reimbursement status is attained, less favorable coverage policies and reimbursement rates may be implemented in the future. Adequate third-party payor reimbursement may not be available to enable us to maintain price levels sufficient to achieve or maintain profitability, and such unavailability could harm our future prospects and reduce our stock price.

The United Kingdom ("UK") and many EU Member States periodically review their reimbursement procedures for medicinal products, which could have an adverse impact on reimbursement status. We expect that legislators, policymakers and healthcare insurance funds in European countries will continue to propose and implement cost-containing measures, such as lower maximum prices, lower or lack of reimbursement coverage and incentives to use cheaper, usually generic, products as an alternative to branded products, and/or branded products available through parallel import to keep healthcare costs down. Moreover, in order to obtain reimbursement for our products in some European countries, including some EU Member States, we may be required to compile additional data comparing the cost-effectiveness of our products to other available therapies. This Health Technology Assessment ("HTA") of medicinal products is becoming an increasingly common part of the pricing and reimbursement procedures in some EU Member States, including those representing the larger markets. The HTA process is the procedure to assess therapeutic, economic and societal impact of a given medicinal product in the national healthcare systems of the individual country. The outcome of an HTA will often influence the pricing and reimbursement status granted to these medicinal products by the competent authorities of individual EU Member States. The extent to which pricing and reimbursement decisions are influenced by the HTA of the specific medicinal product currently varies between EU Member States.

In December 2021, Regulation No 2021/2282 on HTA amending Directive 2011/24/EU, was adopted in the EU. This Regulation, which entered into force in January 2022 and will apply as of January 2025, is intended to boost cooperation among EU Member States in assessing health technologies, including new medicinal products, and providing the basis for cooperation at EU level for joint clinical assessments in these areas. The Regulation foresees a three-year transitional period and will permit EU Member States to use common HTA tools, methodologies, and procedures across the EU, working together in four main areas, including joint clinical assessment of the innovative health technologies with the most potential impact for patients, joint scientific consultations whereby developers can seek advice from HTA authorities, identification of emerging health technologies to identify promising technologies early, and continuing voluntary cooperation in other areas. Individual EU Member States will continue to be responsible for assessing non-clinical (e.g., economic, social, ethical) aspects of health technologies, and making decisions on pricing and reimbursement. If we are unable to maintain favorable pricing and reimbursement status in EU Member States for product candidates that we may successfully develop and for which we may obtain regulatory approval, any anticipated revenue from and growth prospects for those products in the EU could be negatively affected. In light of the fact that the United Kingdom has left the EU, Regulation No 2021/2282 on HTA will not apply in the United Kingdom. However, the UK Medicines and Healthcare products Regulation Agency (“MHRA”) is working with UK HTA bodies and other national organizations, such as the Scottish Medicines Consortium (“SMC”), the National Institute for Health and Care Excellence (“NICE”), and the All-Wales Medicines Strategy Group, to introduce new pathways supporting innovative approaches to the safe, timely and efficient development of medicinal products. For example, in March 2021, the UK introduced the Innovative Licensing and Access Pathways (“ILAP”) which brings together the MHRA, NICE, SMC and the All Wales Therapeutics and Toxicology Centre, to accelerate time to market for certain innovative products.

Legislators, policymakers and healthcare insurance funds in the EU and the United Kingdom may continue to propose and implement cost-containing measures to keep healthcare costs down, particularly due to the financial strain that COVID-19 placed on national healthcare systems of European countries. These measures could include limitations on the prices we would be able to charge for product candidates that we may successfully develop and for which we may obtain regulatory approval or the level of reimbursement available for these products from governmental authorities or third-party payors. Further, an increasing number of EU and other foreign countries use prices for medicinal products established in other countries as “reference prices” to help determine the price of the product in their own territory. Consequently, a downward trend in prices of medicinal products in some countries could contribute to similar downward trends elsewhere.

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We are subject to ongoing FDA, EU and comparable foreign post-marketing obligations concerning HEPLISAV-B, which may result in significant additional expense, and we may be subject to penalties if we fail to comply with regulatory requirements or experience unanticipated regulatory issues with HEPLISAV-B.

Our HEPLISAV-B regulatory approval in the United States is subject to certain post-marketing obligations and commitments to the FDA. For example, we were required to conduct an observational comparative study of HEPLISAV-B to Engerix-B to assess occurrence of acute myocardial infarction (“AMI”). This post-marketing study was initiated in August 2018 and concluded in November 2020. While the results of the study, announced in April 2021, indicated that there was no increased risk of AMI associated with vaccination with HEPLISAV-B compared to Engerix-B, we may be required to conduct further studies on HEPLISAV-B or our other product candidates in the future. Also, we received data from the autoimmune portion of our observational study, and the data indicated no association between HEPLISAV-B and any of the studied autoimmune diseases. In addition, we conducted a pregnancy registry study to provide information on outcomes following pregnancy exposure to HEPLISAV-B and submitted the information to the FDA in December 2023. Failure to complete the study to the satisfaction of the FDA could result in withdrawal of our biologics license application approval, which would have a material adverse effect on our business, results of operations, financial condition and prospects. As we advance our pipeline, similar studies may be required for other candidates. The results of post-marketing studies may also result in additional warnings or precautions for the HEPLISAV-B label or labels of any future products, if authorized, or expose additional safety concerns that may result in product liability and withdrawal of a product or products from the market, any of which would have a material adverse effect on our business, results of operations, financial condition and prospects.

Similar post-marketing obligations and commitments exist in the European Union and Great Britain. For example, we are required to submit periodic safety update reports to the European Medicines Agency ("EMA") and the MHRA and to keep an up-to-date risk management plan that takes into account new information that may lead to a significant change in the risk/benefit profile of HEPLISAV-B. In addition, in accordance with our EU marketing authorization for HEPLISAV-B, HEPLISAV-B is subject to additional monitoring, meaning that it is monitored more intensively than other medicinal products. We may have similar obligations for future products if and when approved. Non-compliance with European Union or United Kingdom requirements regarding safety monitoring or pharmacovigilance can result in significant financial penalties.

In addition, the manufacturing processes, labelling, packaging, distribution, adverse event reporting, storage, advertising, promotion and recordkeeping for HEPLISAV-B are subject to extensive and ongoing regulatory requirements in the United States, the European Union and Great Britain. These requirements include submissions of safety and other post-marketing information and reports, registration, as well as continued compliance with current good manufacturing practices (“cGMP”), good clinical practices (“GCP”), International Conference on Harmonization guidelines, and good laboratory practices (“GLP”). If we are not able to meet and maintain regulatory compliance for HEPLISAV-B or any future product, if authorized, we may lose marketing approval and be required to withdraw our product. Withdrawal of our product would have a material adverse effect on our business.

HEPLISAV-B and all of our clinical programs rely on oligonucleotide TLR agonists. In the event of serious adverse events relating to TLR agonists, we may be required to reduce the scope of, or discontinue, our operations, or reevaluate the viability of strategic alternatives.

Our programs, including HEPLISAV-B, incorporate TLR9 agonist CpG oligonucleotides. If any of our product candidates in clinical trials or similar products from competitors or collaborators result in serious adverse events, we may be required to delay, discontinue or modify our clinical trials or our clinical trial strategy, or significantly reevaluate strategic alternatives. If a safety risk based on mechanism of action or the molecular structure were identified, it may hinder our ability to develop our product candidates or enter into potential collaboration or commercial arrangements. Rare diseases and a numerical imbalance in cardiac adverse events have been observed in patients in our clinical trials. If adverse events are found to relate to our TLR agonist as a whole, we may be required to significantly reduce or discontinue our operations.

HEPLISAV-B is subject to regulatory obligations and continued regulatory review, and if we receive regulatory approval for our other product candidates, we will be subject to ongoing FDA and foreign regulatory obligations and continued regulatory review for such products.

With respect to HEPLISAV-B and our other product candidates in development, we and our third-party manufacturers and suppliers are required to comply with applicable cGMP regulations and other international regulatory requirements. The regulations require that our products and product candidates be manufactured and records maintained in a prescribed manner

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with respect to manufacturing, testing and quality control/quality assurance activities. Manufacturers and suppliers of key components and materials must be named in a Biologics License Application (“BLA”) submitted to the FDA for any product candidate for which we are seeking FDA approval. Additionally, third-party manufacturers and suppliers and any manufacturing facility must undergo a pre-approval inspection before we can obtain marketing authorization for any of our product candidates. Even after a manufacturer has been qualified by the FDA, the manufacturer must continue to expend time, money and effort in the area of production and quality control to ensure full compliance with GMP. Manufacturers are subject to regular, periodic inspections by the FDA following initial approval. Further, to the extent that we contract with third parties for the manufacture of our products or product candidates, our ability to control third-party compliance with FDA requirements will be limited to contractual remedies and rights of inspection.

If, as a result of the FDA’s inspections, it determines that the equipment, facilities, laboratories or processes do not comply with applicable FDA regulations and conditions of product approval, the FDA may not approve the product or may suspend the manufacturing operations. If the manufacturing operations of any of the suppliers for our products or product candidates are suspended, we may be unable to generate sufficient quantities of commercial or clinical supplies of product to meet market demand, which would harm our business. In addition, if delivery of material from our suppliers is interrupted for any reason, we might be unable to ship our approved product for commercial supply or to supply our products in development for clinical trials. Significant and costly delays can occur if the qualification of a new supplier is required. Similar requirements and procedures apply outside of the United States.

Failure to comply with regulatory requirements could prevent or delay marketing approval or require the expenditure of money or other resources to correct. Failure to comply with applicable requirements may also result in warning letters, fines, injunctions, civil penalties, recall or seizure of products, total or partial suspension of production, refusal of the government to renew marketing applications and criminal prosecution, any of which could be harmful to our ability to generate revenues and to our stock price.

Regulatory authorities may require more clinical trials for our product candidates than we currently expect or are conducting before granting regulatory approval, if regulatory approval is granted at all. Our clinical trials may be extended which may lead to substantial delays in the regulatory approval process for our product candidates and may impair our ability to generate revenues.

Our registration and commercial timelines depend on further discussions with regulatory authorities and requirements and any requests that they may make for additional data or completion of additional clinical trials. Any such requirements or requests could:

•adversely affect our ability to timely and successfully commercialize or market these product candidates;

•result in significant additional costs;

•potentially diminish any competitive advantages for those products;

•potentially limit the markets for those products;

•adversely affect our ability to enter into collaborations or receive milestone payments or royalties from potential collaborators;

•cause us to abandon the development of the affected product candidate; or

•limit our ability to obtain additional financing on acceptable terms, if at all.

Clinical trials for our commercial product and product candidates are expensive and time consuming, may take longer than we expect or may not be completed at all, and have uncertain outcomes.

Clinical trials, including post-marketing studies, to generate sufficient data to meet FDA and other regulatory authority requirements are expensive and time consuming, may take more time to complete than expected, may not be completed at all, and may not have favorable outcomes if they are completed. In addition, results from smaller, earlier stage clinical studies may not be representative of larger, controlled clinical trials that would be required in order to obtain regulatory approval of a product candidate.

Each of our clinical trials requires the investment of substantial planning, expense and time and the timing of the commencement, continuation and completion of these clinical trials may be subject to significant delays relating to various

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causes, including scheduling conflicts with participating clinicians and clinical institutions, difficulties in identifying and enrolling participants who meet trial eligibility criteria, failure of participants to complete the clinical trial, delay or failure to obtain Institutional Review Board (“IRB”), Ethics Committee or regulatory approval to conduct a clinical trial at a prospective site, unexpected adverse events and shortages of available vaccine or component supply. Participant enrollment is a function of many factors, including the size of the relevant population, the proximity of participants to clinical sites, the eligibility criteria for the trial, the existence of competing clinical trials and the availability of alternative or new treatments. Failure of one or more product candidates to successfully advance through to approval and licensure could result in the loss of unrecoverable costs expended and impact our ability to generate future revenue from such products, either of which, or both of which, could have an adverse impact on our business.

A key part of our business strategy for products in development is to establish collaborative relationships to help fund or manage development and commercialization of our product candidates and research programs. We may not succeed in establishing and maintaining collaborative relationships, which may significantly limit our ability to continue to develop and commercialize those products and programs, if at all.

We have and may in the future need to establish collaborative relationships to obtain domestic and/or international sales, marketing, research, development and distribution capabilities for our products or product candidates and our discovery research programs. Failure to obtain a collaborative relationship for those products or product candidates and programs in markets outside the U.S. requiring extensive sales efforts may significantly impair the potential for those products and programs and we may be required to raise additional capital to continue them. The process of establishing and maintaining collaborative relationships is difficult and time-consuming, and even if we establish such relationships, they may involve significant uncertainty, including:

•our partners may seek to renegotiate or terminate their relationships with us due to unsatisfactory clinical results, manufacturing issues, a change in business strategy, a change of control or other reasons;

•our perceived shortage of capital resources may impact the willingness of companies to collaborate with us;

•our contracts for collaborative arrangements are often terminable at will on written notice and may otherwise expire or terminate and we may not have alternative funding available;

•our partners may choose to pursue alternative technologies, including those of our competitors;

•we may have disputes with a partner that could lead to litigation or arbitration;

•we have limited control over the decisions of our partners and they may change the priority of our programs in a manner that would result in termination of the agreement or add significant delay in the partnered program;

•our ability to generate future payments and royalties from our partners depends upon the abilities of our partners to establish the safety and efficacy of product candidates, obtain regulatory approvals and successfully manufacture and commercialize the products developed from product candidates;

•we or our partners may fail to properly initiate, maintain or defend our intellectual property rights, where applicable, or a party may use our proprietary information in such a way as to invite litigation that could jeopardize or potentially invalidate our intellectual property or other proprietary rights or expose us to potential liability;

•our partners may not devote sufficient capital or resources towards our product candidates; and

•our partners may not comply with applicable government regulatory requirements.

Supporting diligence activities conducted by potential collaborators and negotiating the financial and other terms of a collaboration agreement are long and complex processes with uncertain results. Despite our efforts, we may be unable to secure collaborative arrangements. If we are unable to establish and maintain collaborative relationships on acceptable terms or to successfully transition terminated collaborative agreements, we may have to delay or discontinue further development of one or more of our product candidates, undertake development and commercialization activities at our own expense or find alternative sources of capital.

Even when we are successful in entering into collaboration agreements, collaborations can involve greater uncertainty for us, as we have less control over certain aspects of our collaborative programs than we do over our solely-owned development and commercialization programs, and the financial terms upon which collaborators are willing to enter into such an arrangement cannot be certain. If any collaborator fails to fulfill its responsibilities in a timely manner, or at all, our

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research, clinical development, manufacturing or commercialization efforts pursuant to that collaboration could be delayed or terminated, or it may be necessary for us to assume responsibility for expenses or activities that would otherwise have been the responsibility of our collaborator.

For example, we are working to develop our CpG 1018 adjuvant as a premier vaccine adjuvant through research collaborations, partnerships and supply arrangements. Current relationships and efforts are focused on adjuvanted vaccines for COVID-19, shingles, Tdap, plague and influenza. For some of these relationships, our collaborators have primary responsibility for the development, conduct of clinical trials, and for seeking and obtaining regulatory approval of potential vaccines containing our adjuvant. We have limited or no control over our collaborators’ decisions, including the amount and timing of resources that any of these collaborators will dedicate to such activities. In circumstances where our collaborators do not purchase as much adjuvant as we anticipate or they delay placing orders or taking certain deliveries, there can be a negative impact on our revenue recognition. If a collaborator fails to conduct collaborative activities successfully, the development and commercialization of a vaccine could be delayed or may not occur at all. Lastly, the ability of our collaborators to deliver, sell and collect on receivables is not guaranteed and this could, in turn, impact our own ability to collect receivables.

Until we are able to generate significant revenues or achieve profitability through product sales on a consistent basis, we may require substantial additional capital to finance our operations.

As of December 31, 2023, we had $742.3 million in cash and cash equivalents, and marketable securities. Prior to January 1, 2021, we incurred net losses in each year since our inception. We recorded a net loss of $6.4 million for the year ended December 31, 2023. As of December 31, 2023, we had an accumulated deficit of $930.6 million. We expect to continue to incur substantial expenses as we continue to invest in the commercialization and development of HEPLISAV-B and our CpG 1018 adjuvant, clinical trials for our pipeline candidates, and other development. If we cannot generate a sufficient amount of revenue from product sales, we may need to finance our operations through strategic alliance and licensing arrangements and/or future public or private debt and equity financings. Raising additional funds through the issuance of equity or debt securities could result in dilution to our existing stockholders, increased fixed payment obligations, or both. In addition, our 2.50% convertible senior notes due 2026 (“Convertible Notes”) and other securities we issue in the future may have rights senior to those of our common stock and could include covenants that restrict our operations.

Our ability to raise additional capital in the equity and debt markets, should we choose to do so, is dependent on a number of factors, including, but not limited to, the market demand for our common stock, which itself is subject to a number of development and business risks and uncertainties, our creditworthiness and the uncertainty that we would be able to raise such additional capital at a price or on terms that are favorable to us. In addition, our ability to raise additional funds may be adversely impacted by deteriorating global economic conditions and disruptions to and volatility in the credit and financial markets in the United States and worldwide. Adequate financing may not be available to us on acceptable terms, or at all. If adequate funds are not available when needed, we may need to significantly reduce our operations while we seek strategic alternatives, which could have an adverse impact on our ability to achieve our intended business objectives and the value of our stock.

As we plan for the broader commercialization of our HEPLISAV-B vaccine and for the requisite capacity to manufacture our CpG 1018 adjuvant, our financial commitments for manufacturing and supply capacity might outpace actual demand for our products.

As we manage our production capabilities for HEPLISAV-B and CpG 1018 adjuvant to support recent market share gains and other initiatives, we have been, and in the future could be, required to make significant financial commitments at our contract manufacturing organizations (“CMOs”), including minimum purchase commitments and prepayments of purchase orders to facilitate the procurement of raw materials and the incurrence of various manufacturing costs. Because of minimum or advance purchase commitments and uncertainty about the expected demand for HEPLISAV-B or CpG 1018 adjuvant, the financial commitments we make to our CMOs to support manufacturing may not be recovered in their entirety, or at all, if our customers do not ultimately purchase from us at expected volumes, or other concessions are made by us. Capacity reservation fees are generally not recoverable if we do not use the capacity we have reserved as a result of lower than expected demand, or otherwise. Similarly, prepayments of purchase orders may not be recoverable if we do not ultimately require the entire volume subject to the applicable purchase order. As a result, we could end up making financial commitments that we never recover if demand for HEPLISAV-B or CpG 1018 adjuvant does not materialize in the volumes we are expecting or at all. This may require us to record certain charges or write-offs in one or more fiscal periods, which in turn could result in significant, unexpected fluctuations in our quarterly and annual operating results, and potentially have a material adverse effect on our results of operations, and financial condition.

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For example, in August and October 2022, we entered into amendments to the Clover Supply Agreement, which, among other things, modified the scope of the Clover Supply Agreement to reduce certain quantities of CpG 1018 adjuvant that we originally intended to deliver in accordance with a purchase order previously issued by Clover. As a result of the concessions made in the amendments to the Clover Supply Agreement, prior financial commitments made to certain CMOs to manufacture quantities of CpG 1018 adjuvant to fulfill the original Clover purchase order, and reduced demand for CpG 1018 adjuvant, we recorded write-offs of $13.9 million of CpG 1018 adjuvant raw materials inventory and $20.4 million of finished goods inventory during the year ended December 31, 2022. Relating to our Bio E Supply Agreement, we entered into an amendment and an assignment agreement in April 2023, pursuant to which (i) CEPI forgave the entirety of remaining amounts outstanding relating to the Bio E CEPI Advance Payments for CpG 1018 Materials allocated to Bio E and has assumed our previous rights to collect $47.4 million of Bio E accounts receivable, (ii) we collected $14.5 million from Bio E, resulting in no accounts receivable balance as of December 31, 2023, and (iii) we derecognized a $47.4 million CEPI accrual in connection with the Bio E CEPI Advance Payments. It is possible we may have similar write-offs in the future.

We may develop, seek regulatory approval for and market HEPLISAV-B or any other product candidates outside of the U.S., the European Union and Great Britain, requiring a significant additional commitment of resources. Failure to successfully manage our international operations could result in significant unanticipated costs and delays in regulatory approval or commercialization of our products or product candidates.

We may seek to introduce HEPLISAV-B, or any other product candidates we may develop, to various additional markets in or outside of the U.S., the European Union and Great Britain. Developing, seeking regulatory approval for and marketing our product candidates in or outside of the U.S., the European Union and Great Britain in jurisdictions where we don't currently have approval could impose substantial costs, impose burdens on our personnel, and divert management’s attention from domestic operations. International operations are subject to risk, including:

•the difficulty of managing geographically distant operations, including recruiting and retaining qualified employees, locating adequate facilities and establishing useful business support relationships in the local community;

•compliance with varying international regulatory requirements, laws and treaties;

•securing international distribution, marketing and sales capabilities upon favorable terms;

•adequate protection of our intellectual property rights;

•obtaining regulatory and pricing approvals at a level sufficient to justify commercialization;

•legal uncertainties and potential timing delays associated with tariffs, export licenses and other trade barriers;

•foreign tax compliance and diverse tax consequences;

•the fluctuation of conversion rates between foreign currencies and the U.S. dollar; and

•regional and geopolitical risks.

In the event that we determine to pursue commercialization of HEPLISAV-B outside the United States, the European Union and Great Britain, our opportunity will depend upon our receiving regulatory approval, which can be costly and time consuming, and there is a risk that one or more regulatory bodies may require that we conduct additional clinical trials and/or take other measures which will take time and require that we incur significant additional expense. In addition, we may not receive approval in one or more jurisdictions, even if we undertake these efforts.

The results of clinical trials conducted to support regulatory approval in one or more jurisdictions, and any failure or delay in obtaining regulatory approval in one or more jurisdictions, may have a negative effect on the regulatory approval process in other jurisdictions, including our existing regulatory approval in the United States, the European Union and Great Britain. If we are unable to successfully manage our international operations, we may incur significant unanticipated costs and delays in regulatory approval or commercialization of our products or product candidates, which would impair our ability to generate revenues.

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We rely on CROs and clinical sites and investigators for our clinical trials. If these third parties do not fulfill their contractual obligations or meet expected deadlines, our planned clinical trials may be delayed and we may fail to obtain the regulatory approvals necessary to commercialize our product candidates.

We rely on CROs, clinical sites and investigators for our clinical trials. If these third parties do not perform their obligations or meet expected deadlines our planned clinical trials may be extended, delayed, modified or terminated. While we maintain oversight over our clinical trials and conduct regular reviews of the data, we are dependent on the processes and quality control efforts of our third-party contractors to ensure that clinical trials are conducted properly and that detailed, quality records are maintained to support the results of the clinical trials that they are conducting on our behalf. Any extension, delay, modification or termination of our clinical trials or failure to ensure adequate documentation and the quality of the results in the clinical trials could delay or otherwise adversely affect our ability to commercialize our product candidates and could have a material adverse effect on our business and operations.

As a biopharmaceutical company, we engage CROs to conduct clinical studies, and failure by us or our CROs to conduct a clinical study in accordance with GCP standards and other applicable regulatory requirements could result in disqualification of the applicable clinical trial from consideration in support of approval of a potential product.

We are responsible for conducting our clinical trials consistent with GCP standards and for oversight of our vendors to ensure that they comply with such standards. We depend on medical institutions and CROs to conduct our clinical trials in compliance with GCP. To the extent that we or they fail to comply with GCP standards, fail to enroll participants for our clinical trials, or are delayed for a significant time in the execution of our trials, including achieving full enrollment, we may be affected by increased costs, program delays or both, which may harm our business.

Clinical trials must be conducted in accordance with FDA or other applicable foreign government guidelines and are subject to oversight by the FDA, other foreign regulatory authorities, IRBs and the Ethics Committees at the medical institutions where the clinical trials are conducted. In addition, clinical trials must be conducted with supplies of our product candidates produced under GMP and other requirements in foreign countries and may require large numbers of participants.

In addition, we obtain guidance from regulatory authorities on certain aspects of our clinical development activities and seek to comply with written guidelines provided by the authorities. These discussions and written guidelines are not binding obligations on the part of the regulatory authorities and the regulatory authorities may require additional patient data or studies to be conducted. Regulatory authorities may revise or retract previous guidance during the course of a clinical trial or after completion of the trial. The authorities may also disqualify a clinical trial from consideration in support of approval of a potential product if they deem the guidelines have not been met. The FDA or foreign regulatory authorities may determine our clinical trials or other data regarding safety, efficacy or consistency of manufacture or compliance with GMP regulations are insufficient for regulatory approval.

The FDA or other foreign regulatory authorities or we ourselves could delay, suspend or halt our clinical trials of a product candidate for numerous reasons, including with respect to our product candidates and those of our partners in combination agent studies:

•deficiencies in the trial design;

•deficiencies in the conduct of the clinical trial including failure to conduct the clinical trial in accordance with regulatory requirements or clinical protocols;

•deficiencies in the clinical trial operations or trial sites resulting in the imposition of a clinical hold;

•a product candidate may have unforeseen adverse side effects, including fatalities, or a determination may be made that a clinical trial presents unacceptable health risks;

•the time required to determine whether a product candidate is effective may be longer than expected;

•fatalities or other adverse events arising during a clinical trial that may not be related to clinical trial treatments;

•a product candidate or combination study may appear to be no more effective than current therapies;

•the quality or stability of a product candidate may fail to conform to acceptable standards;

•the inability to produce or obtain sufficient quantities of a product candidate to complete the trials;

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•our inability to reach agreement on acceptable terms with prospective CROs and trial sites, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

•our inability to obtain IRB or Ethics Committee approval to conduct a clinical trial at a prospective site;

•the inability to obtain regulatory approval to conduct a clinical trial;

•lack of adequate funding to continue a clinical trial, including the occurrence of unforeseen costs due to enrollment delays, requirements to conduct additional trials and studies and increased expenses associated with the services of our CROs and other third parties;

•the inability to recruit and enroll individuals to participate in clinical trials for reasons including competition from other clinical trial programs for the same or similar indications; or

•the inability to retain participants who have initiated a clinical trial but may withdraw due to side effects from the product, lack of efficacy or personal issues, or who are otherwise unavailable for further follow-up.

In addition, we may experience significant setbacks in advanced clinical trials, even after promising results in earlier trials, such as unexpected adverse events that occur when our product candidates are given to larger patient populations, which often occur in later-stage clinical trials, or less favorable clinical outcomes. Moreover, clinical results are frequently susceptible to varying interpretations that may delay, limit or prevent regulatory approvals.

Negative or inconclusive results or adverse medical events, including participant fatalities that may be attributable to our product candidates, during a clinical trial may necessitate that it be redesigned, repeated or terminated. Further, some of our clinical trials may be overseen by a Data Safety Monitoring Board (“DSMB”), and the DSMB may determine to delay or suspend one or more of these trials due to safety or futility findings based on events occurring during a clinical trial. Any such delay, suspension, termination or request to repeat or redesign a trial could increase our costs and prevent or significantly delay our ability to commercialize our product candidates. Even if we complete all such activities without issue, final results may not actually support approval of a particular product candidate.

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

We have incurred significant net operating losses ("NOLs") during our history, and despite prior profitability, may not be able to achieve sustained profitability over the long term. Unused U.S. federal NOLs for taxable years beginning before January 1, 2018 may be carried forward to offset future taxable income, if any, until such unused NOLs expire. Under legislation enacted in 2017, as modified by legislation enacted in 2020, U.S. federal NOLs incurred in taxable years beginning after December 31, 2017 can be carried forward indefinitely, but the deductibility of such U.S. federal NOLs in taxable years beginning after December 31, 2020 is limited to 80% of taxable income. It is uncertain if and to what extent various states will conform to the aforementioned U.S. tax law provisions.

As of December 31, 2023, we had U.S. federal and state NOL carryforwards of $376.6 million and $283.9 million, respectively. Of the $376.6 million U.S. federal NOL carryforwards, $353.5 million may be carried forward indefinitely with utilization limited to 80% of taxable income, and the remainder will begin to expire in 2024. The state NOL carryforwards will begin to expire in 2024.

In addition, under Section 382 of the Internal Revenue Code of 1986, as amended, and corresponding provisions of state law, if a corporation undergoes an “ownership change,” which is generally defined as one or more stockholders or groups of stockholders who own at least 5% of our stock increasing their ownership by more than 50 percentage points over their lowest ownership percentage within a rolling three-year period, the corporation’s ability to use its pre-change NOL carryforwards to offset its post-change income or taxes may be limited. We have experienced ownership changes as a result of shifts in our stock ownership in the past, and in the future it is possible that we may be deemed to have experienced additional ownership changes as a result of shifts in our stock ownership, some of which may be outside of our control. This could limit the amount of NOLs that we can utilize annually to offset future taxable income or tax liabilities. Subsequent ownership changes and changes to the U.S. tax rules in respect of the utilization of NOLs may further affect the limitation in future years. In addition, at the state level, there may be periods during which the use of NOLs is suspended or otherwise limited, which could accelerate or permanently increase state taxes owed.

Tax law changes could adversely affect our business and financial condition.

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New income, sales, use or other tax laws, statutes, rules, regulations or ordinances could be enacted at any time, which could adversely affect our business operations and financial performance. Further, existing tax laws, statutes, rules, regulations or ordinances could be interpreted, changed, modified or applied adversely to us. For example, legislation informally titled the Tax Cuts and Jobs Act of 2017, the 2020 Coronavirus Aid, Relief, and Economic Security Act, and the 2022 Inflation Reduction Act enacted many significant changes to the U.S. tax laws. Future guidance from the Internal Revenue Service and other tax authorities with respect to such legislation may affect us, and certain aspects of the foregoing tax legislation could be repealed or modified in future legislation. In addition, it is uncertain if and to what extent various states will conform to such legislation or any newly enacted federal tax legislation. Changes in corporate tax rates, the realization of net deferred tax assets relating to our operations, the taxation of foreign earnings, and the deductibility of expenses under past or future reform legislation could have a material impact on the value of our deferred tax assets, could result in significant one-time charges, and could increase our future U.S. tax expense.

We are subject to stringent and evolving U.S. and foreign laws, regulations, and rules, contractual obligations, industry standards, policies and other obligations related to data privacy and security. Our actual or perceived failure to comply with such obligations could lead to regulatory investigations or actions; litigation; fines and penalties; disruptions of our business operations; reputational harm; loss of revenue or profits; loss of customers or sales; and other adverse business consequences.

In the ordinary course of business, we process personal data and other sensitive information, including our proprietary and confidential business data, trade secrets, intellectual property, data we may collect about trial participants in connection with clinical trials, and other sensitive data. Our data processing activities subject us to numerous data privacy and security obligations, such as various laws, regulations, guidance, industry standards, external and internal privacy and security policies, contracts, and other obligations that govern the processing of personal data by us and on our behalf.

In the United States, federal, state, and local governments have enacted numerous data privacy and security laws, including data breach notification laws, personal data privacy laws, consumer protection laws (e.g., Section 5 of the Federal Trade Commission Act), and other similar laws (e.g., wiretapping laws). In the past few years, numerous U.S. states—including California, Virginia, Colorado, Connecticut, and Utah—have enacted comprehensive privacy laws that impose certain obligations on covered businesses, including providing specific disclosures in privacy notices and affording residents with certain rights concerning their personal data. As applicable, such rights may include the right to access, correct, or delete certain personal data, and to opt-out of certain data processing activities, such as targeted advertising, profiling, and automated decision-making. The exercise of these rights may impact our business and ability to provide our products and services. Certain states also impose stricter requirements for processing certain personal data, including sensitive information, such as conducting data privacy impact assessments. These state laws allow for statutory fines for noncompliance. For example, the California Consumer Privacy Act of 2018, as amended by the California Privacy Rights Act of 2020 (“CPRA”) (collectively, “CCPA”) requires businesses to provide specific disclosures in privacy notices and honor requests of California residents to exercise certain privacy rights. The CCPA provides for civil penalties of up to $7,500 per intentional violation and allows private litigants affected by certain data breaches to recover significant statutory damages. Similar laws are being considered in several other states, as well as at the federal and local levels. These developments may further complicate compliance efforts and may increase legal risk and compliance costs for us and the third parties upon whom we rely.

Outside the United States, an increasing number of laws, regulations, and industry standards may govern data privacy and security. For example, the European Union’s General Data Protection Regulation (“EU GDPR”), the United Kingdom’s General Data Protection Regulation (“UK GDPR”), Brazil’s General Data Protection Law (Lei Geral de Proteção de Dados Pessoais, or “LGPD”) (Law No. 13,709/2018), and China’s Personal Information Protection Law (“PIPL”) impose strict requirements for processing personal data. For example, under the EU GDPR, companies may face temporary or definitive bans on data processing and other corrective actions; fines of up to 20 million Euros or 4% of annual global revenue, whichever is greater; or private litigation related to processing of personal data brought by classes of data subjects or consumer protection organizations authorized at law to represent their interests.

In addition, we may be unable to transfer personal data from the EEA and other jurisdictions to the United States or other countries due to data localization requirements or limitations on cross-border data flows. Although there are various mechanisms that may be used in some cases to lawfully transfer personal data to the United States or other countries, these mechanisms are subject to legal challenges and may not be available to us. An inability or material limitation on our ability to transfer personal data to the United States or other countries could materially impact our business operations.

In the ordinary course of business, we may transfer personal data from the EEA and other jurisdictions to the United States or other countries. We may be unable to transfer personal data from Europe and other jurisdictions to the United States

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or other countries due to data localization requirements or limitations on cross-border data flows. Europe and other jurisdictions have enacted laws requiring data to be localized or limiting the transfer of personal data to other countries. In particular, the EEA and the United Kingdom have significantly restricted the transfer of personal data to the United States and other countries whose privacy laws it believes are inadequate. Other jurisdictions may adopt similarly stringent interpretations of their data localization and cross-border data transfer laws.

Although there are currently various mechanisms that may be used to transfer personal data from the EEA and UK to the United States in compliance with law, such as the EEA and UK’s standard contractual clauses, these mechanisms are subject to legal challenges, and there is no assurance that we can satisfy or rely on these measures to lawfully transfer personal data to the United States.

If there is no lawful manner for us to transfer personal data from the EEA, the UK, or other jurisdictions to the United States, or if the requirements for a legally-compliant transfer are too onerous, we could face significant adverse consequences, including the interruption or degradation of our operations, the need to relocate part of or all of our business or data processing activities to other jurisdictions at significant expense, increased exposure to regulatory actions, substantial fines and penalties, the inability to transfer data and work with partners, vendors and other third parties, and injunctions against our processing or transferring of personal data necessary to operate our business. Additionally, companies that transfer personal data out of the EEA and UK to other jurisdictions, particularly to the United States, are subject to increased scrutiny from regulators, individual litigants, and activist groups. Some regulators in the EEA have ordered certain companies to suspend or permanently cease certain transfers of data out of Europe for allegedly violating the GDPR’s cross-border data transfer limitations.

On October 7, 2022, President Biden signed an Executive Order on “Enhancing Safeguards for United States Signals Intelligence Activities,” which implements into United States law the agreement in principle announced in March 2022 on a new EU-U.S. Data Privacy Framework. However, if this new transatlantic data transfer framework is not adopted and we are unable to continue to rely on standard contractual clauses or alternative mechanisms of data transfers from the EEA to the United States, this may materially and adversely affect our business, financial condition, and results of operations.

Additional privacy advocates and industry groups have proposed, and may propose in the future, standards with which we are legally or contractually bound to comply.

In addition to data privacy and security laws, we may be contractually subject to industry standards adopted by industry groups and may become subject to such obligations in the future. We may be subject to contractual obligations and policies related to data privacy and security. We may also be bound by other contractual obligations related to data privacy and security, and our efforts to comply with such obligations may not be successful. For example, certain privacy laws, such as the EU GDPR and UK GDPR, require our customers to impose specific contractual restrictions on their service providers.

Data privacy and security laws are quickly changing, and compliance (and any perceived non-compliance) is costly. Although we endeavor to comply with all applicable data privacy and security obligations, these obligations are quickly changing in an increasingly stringent fashion, creating some uncertainty as to how to comply. Additionally, these obligations may be subject to differing applications and interpretations, which may be inconsistent or conflict among jurisdictions. If we or the third parties on which we rely fail, or are perceived to have failed, to address or comply with applicable data privacy and security obligations, we could face significant consequences, including but not limited to, government enforcement actions (e.g., investigations, fines, penalties, audits, inspections, and similar); litigation (including class-related claims); additional reporting requirements and/or oversight; bans on processing personal data; orders to destroy or not use personal data; and imprisonment of company officials.

Any of these events could have a material adverse effect on our reputation, business, or financial condition, including but not limited to: loss of customers; interruptions or stoppages in our business operations, including our clinical trials; expenditure of time and resources to defend any claim or inquiry; adverse publicity; or revision or restructuring of our operations.

If we fail to comply with the extensive requirements applicable to biopharmaceutical manufacturers and marketers under the healthcare fraud and abuse, anticorruption, privacy, transparency and other laws of the jurisdictions in which we conduct our business, we may be subject to significant liability.

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Our activities, and the activities of our agents, including some contracted third parties, are subject to extensive government regulation and oversight both in the U.S. and in foreign jurisdictions. Our interactions with physicians and others in a position to prescribe or purchase our products are subject to a legal regime designed to prevent healthcare fraud and abuse and off-label promotion. We also are subject to laws pertaining to transparency of transfers of value to healthcare providers; privacy and data protection; compliance with industry voluntary compliance guidelines; and prohibiting the payment of bribes. Relevant U.S. laws include:

•the federal Anti-Kickback Statute, which prohibits persons from, among other things, knowingly and willfully soliciting, receiving, offering or paying remuneration, directly or indirectly, in exchange for or to induce either the referral of an individual for, or the purchase, order or recommendation of, any good or service for which payment may be made under federal health care programs, such as the Medicare and Medicaid programs;

•federal false claims laws, including the False Claims Act and Civil Monetary Penalties Law, which prohibit individuals or entities from, among other things, knowingly presenting, or causing to be presented, claims for payment to the government or its agents that are false or fraudulent;

•the Federal Food, Drug and Cosmetic Act and governing regulations which, among other things, prohibit off-label promotion of prescription drugs;

•the federal Physician Payments Sunshine Act created under the Patient Protection and Affordable Care Act of 2010, as amended by the Health Care and Education and Reconciliation Act of 2010 (collectively, “ACA”) which requires certain manufacturers of drugs, devices, biologics and medical supplies to report annually to the Centers for Medicare & Medicaid Services, information related to payments and other transfers of value to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors), other health care professionals (such as physician assistants and nurse practitioners), and teaching hospitals, and ownership and investment interests held by such physicians and their immediate family members;

•the federal Health Insurance Portability and Accountability Act of 1996 (“HIPAA”), which created, among other things, new federal criminal statutes that prohibit knowingly and willfully executing, or attempting to execute, a scheme to defraud any healthcare benefit program, or knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false statement, in connection with the delivery of, or payment for, healthcare benefits, items or services;

•HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, and their implementing regulations, which imposes certain requirements on “covered entities,” including certain healthcare providers, health plans, and healthcare clearinghouses, and their respective “business associates” that create, receive, maintain or transmit individually identifiable health information for or on behalf of a covered entity as well as their covered subcontractors relating to the privacy, security, and transmission of individually identifiable health information;

•the Foreign Corrupt Practices Act, which prohibits the payment of bribes to foreign government officials and requires that a company’s books and records accurately reflect our transactions; and

•foreign and state law equivalents of each of the federal laws described above, such as anti-kickback and false claims laws which may apply to items or services reimbursed by state health insurance programs or any third-party payor, including commercial insurers; state laws that require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the applicable compliance guidance promulgated by the federal government; state laws that require drug manufacturers to report information on the pricing of certain drugs; state and local laws that require the registration of pharmaceutical sales representatives; and state and foreign laws governing the privacy and security of health information, many of which differ from each other in significant ways and often are not preempted by HIPAA.

In the U.S., the Office of Inspector General for the Department of Health and Human Services, the Department of Justice, states’ Attorneys General and other governmental authorities actively enforce the laws and regulations discussed above. These entities also coordinate extensively with the FDA, using legal theories that connect violations of the Federal Food, Drug and Cosmetic Act (such as off-label promotion) to the eventual submission of false claims to government healthcare programs. Prosecution of such promotion cases under the False Claims Act provides the potential for private parties (qui tam relators, or “whistleblowers”) to initiate cases on behalf of the government and provides for significantly higher penalties upon conviction.

In the U.S., pharmaceutical and biotechnology companies have been the target of numerous government prosecutions and investigations alleging violations of law, including claims asserting impermissible off-label promotion of pharmaceutical

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products, payments intended to influence the referral of federal or state health care business, submission of false claims for government reimbursement, or submission of incorrect pricing information.

Violations of any of the laws described above or any other applicable governmental regulations and other similar foreign laws may subject us, our employees or our agents to significant criminal, civil and administrative penalties, including fines, civil monetary penalties, exclusion from participation in government health care programs (including, in the U.S., Medicare and Medicaid), disgorgement, imprisonment, additional reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws and the restriction or restructuring of our operations, any of which could adversely affect our ability to operate our business and our financial results. Additionally, whether or not we have complied with the law, an investigation into alleged unlawful conduct may cause us to incur significant expense, cause reputational damage, divert management time and attention, and otherwise adversely affect our business. While we have developed and instituted a corporate compliance program, we cannot guarantee that we, our employees, our consultants, contractors, or other agents are or will be in compliance with all applicable U.S. or foreign laws.

We have applied for, and in some cases have received, grants that, if and when received, may involve pricing or other restrictions.

We have applied for, and in some cases have received, grants from various charitable, philanthropic and other organizations that, if and when received, may come with certain pricing requirements, global access requirements, reporting requirements or other covenants that require us to make the funded product available worldwide and on a nondiscriminatory basis. For example, we received such an initial grant from the Bill and Melinda Gates Foundation in 2020 to help fund the potential scale-up of production of our CpG 1018 adjuvant that may be required in the event the CpG 1018 adjuvant is included in any approved and commercially available vaccine, whether a COVID-19 vaccine or otherwise. Covenants in these types of grants may limit the price we can charge for any funded product and may involve a license to use technology we own that is included in the funded products if we do not comply. Such price limitations or licenses, if invoked, could serve to limit the prices we charge, or our control over the manufacturing and distribution of grant-funded products. Failure to agree to such requirements, may result in us not receiving some or all of the grant.

Enacted or future legislation, including potentially unfavorable pricing regulations or other healthcare reform initiatives, may have an adverse effect on our operations and business.

We expect there will continue to be federal and state laws and/or regulations, proposed and implemented, that could impact our operations and business. For example, the ACA, among other things, imposes a significant annual fee on companies that manufacture or import branded prescription drug products. It also contains substantial provisions intended to broaden access to health insurance, reduce or constrain the growth of healthcare spending, and impose additional health policy reforms, any or all of which may affect our business. There have been executive, legal and political challenges to certain aspects of ACA. For example, President Trump signed several executive orders and other directives designed to delay, circumvent, or loosen certain requirements mandated by ACA. Concurrently, Congress considered legislation that would repeal or repeal and replace all or part of 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. The Tax Cuts and Jobs Act of 2017 included a provision repealing, effective January 1, 2019, the tax-based shared responsibility payment imposed by ACA on certain individuals who fail to maintain qualifying health coverage for all or part of a year that is commonly referred to as the “individual mandate.” In addition, the 2020 federal spending package permanently eliminated, effective January 1, 2020, the ACA-mandated “Cadillac” tax on high-cost employer-sponsored health coverage and medical device tax and, effective January l, 2021, also eliminated the health insurer tax. The Bipartisan Budget Act of 2018 among other things, amended the ACA, effective January 1, 2019, to increase from 50 percent to 70 percent the point-of-sale discount that is owed by pharmaceutical manufacturers who participate in Medicare Part D and close the coverage gap in most Medicare drug plans, commonly referred to as the “donut hole.” On June 17, 2021, the U.S. Supreme Court dismissed a challenge on procedural grounds that argued the ACA is unconstitutional in its entirety because the “individual mandate” was repealed by Congress. In addition, the ACA has been subject to various health reform measures. For example, on August 16, 2022, President Biden signed the Inflation Reduction Act of 2022 (“IRA”) into law, which among other things, extends enhanced subsidies for individuals purchasing health insurance coverage in ACA marketplaces through plan year 2025. The IRA also eliminates the “donut hole” under the Medicare Part D program beginning in 2025 by significantly lowering the beneficiary maximum out-of-pocket cost and through a newly established manufacturer discount program. It is unclear how any such challenges and additional healthcare reform measures by the Biden administration will impact the ACA and our business.

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Other legislative changes have also been proposed and adopted since the ACA was enacted. For example, the Budget Control Act of 2011 resulted in aggregate reductions in Medicare payments to providers of up to two percent per fiscal year, starting in 2013 and, due to subsequent legislative amendments to the statute, will remain in effect until 2032 unless additional Congressional action is taken. Additionally, on March 11, 2021, President Biden signed the American Rescue Plan Act of 2021 into law, which eliminates the statutory Medicaid drug rebate cap, currently set at 100% of a drug’s average manufacturer price, for single source and innovator multiple source drugs, effective January 1, 2024. In addition, the American Taxpayer Relief Act of 2012, among other things, reduced Medicare payments to several types of providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. Such laws, and others that may affect our business that have been recently enacted or may in the future be enacted, may result in additional reductions in Medicare and other healthcare funding.

Also, there has been heightened governmental scrutiny recently in the U.S. over pharmaceutical pricing practices in light of the rising cost of prescription drugs and biologics. Such scrutiny has resulted in several recent Congressional inquiries and proposed and enacted federal and state legislation designed to, among other things, bring more transparency to product pricing, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for products. At the federal level, in July 2021, the Biden administration released an executive order, “Promoting Competition in the American Economy,” with multiple provisions aimed at prescription drugs. In response to Biden’s executive order, on September 9, 2021, the U.S. Department of Health and Human Services (“HHS”) released a Comprehensive Plan for Addressing High Drug Prices that outlines principles for drug pricing reform and sets out a variety of potential legislative policies that Congress could pursue to advance these principles. In addition, the IRA, among other things, (i) directs HHS to negotiate the price of certain drugs and biologics covered under Medicare, and subjects drug manufacturers to civil monetary penalties and a potential excise tax by offering a price that is not equal to or less than the negotiated “maximum fair price” under the law, and (ii) imposes rebates under Medicare Part B and Medicare Part D to penalize price increases that outpace inflation. The IRA permits HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years. These provisions take effect progressively starting in 2023. On August 29, 2023, HHS announced the list of the first ten drugs that will be subject to price negotiations, although the Medicare drug pricing negotiation program is currently subject to legal challenges. It is currently unclear how the IRA will be effectuated but is likely to have a significant impact on the pharmaceutical industry. Further, in response to the Biden administration’s October 2022 executive order, on February 14, 2023, HHS released a report outlining three new models for testing by the Centers for Medicare & Medicaid Services ("CMS") Innovation Center which will be evaluated on their ability to lower the cost of drugs, promote accessibility, and improve quality of care. It is unclear whether the models will be utilized in any health reform measures in the future. 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. While march-in rights have not previously been exercised, it is uncertain if that will continue under the new framework.

At the state level, legislatures have increasingly passed legislation and implemented regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, and restrictions on certain product access. In some cases, such legislation and regulations have been designed to encourage importation from other countries and bulk purchasing. For example, on January 5, 2024, the FDA approved Florida’s Section 804 Importation Program (SIP) proposal to import certain drugs from Canada for specific state healthcare programs. It is unclear how this program will be implemented, including which drugs will be chosen, and whether it will be subject to legal challenges in the United States or Canada. Other states have also submitted SIP proposals that are pending review by the FDA. Any such approved importation plans, when implemented, may result in lower drug prices for products covered by those programs.

Many EU Member States periodically review their reimbursement procedures for medicinal products, which could have an adverse impact on reimbursement status. We expect that legislators, policymakers and healthcare insurance funds in the EU Member States will continue to propose and implement cost-containing measures, such as lower maximum prices, lower or lack of reimbursement coverage and incentives to use cheaper, usually generic, products as an alternative to branded products, and/or branded products available through parallel import to keep healthcare costs down.

We cannot predict the initiatives that may be adopted in the future or the effect any such initiatives may have on our business. However, in the future, there will likely continue to be additional proposals relating to the reform of the U.S. healthcare system, and other equivalent foreign systems, some of which could further limit coverage and reimbursement of products, including our product candidates. Any reduction in reimbursement from Medicare or other government programs

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may result in a similar reduction in payments from private payors. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability or commercialize our products.

In connection with our work with the U.S. Department of Defense ("DoD"), we have become a defense contractor, and are therefore subject to additional administrative burdens and control requirements in connection with the maintenance of that relationship.

In September 2021, we entered into an agreement with the DoD relating to the conduct of a clinical trial and studies in connection with the development of an improved plague vaccine. In connection with this agreement, we became subject to new administrative and control requirements, including certain reporting obligations as well as a requirement to develop, implement and maintain an International Traffic in Arms Regulations compliance program, among other things. Further, if our efforts result in an improved plague vaccine and we enter into a supply agreement for finished plague vaccines with the DoD, we expect that such a supply contract would impose additional administrative, control, compliance and other obligations. We have limited experience developing and administering such programs. Development and maintenance of such programs can be burdensome and costly and there can be no guarantee that we will be able to maintain compliance with all of the terms of such an agreement. Failure to comply with these requirements could have a significant reputational or financial impact on our business and on our stock price.

We face product liability exposure, which, if not covered by insurance, could result in significant financial liability.

While we have not experienced any product liability claims to date, the use of any of our product candidates in clinical trials and the sale of any approved products, including HEPLISAV-B, will subject us to potential product liability claims and may raise questions about a product’s safety and efficacy. As a result, we could experience a delay in our ability to commercialize one or more of our product candidates or reduced sales of any approved product candidates. In addition, a product liability claim may exceed the limits of our insurance policies and exhaust our internal resources. We have obtained limited clinical trial liability and umbrella insurance coverage for our clinical trials. This coverage may not be adequate or may not continue to be available in sufficient amounts, at an acceptable cost, or at all. While we have obtained product liability insurance coverage for HEPLISAV-B, there is a risk that this coverage may not be adequate or may not continue to be available in sufficient amounts, at an acceptable cost or at all. We also may not be able to obtain commercially reasonable product liability insurance for any product approved for marketing in the future. A product liability claim, product recalls or other claims, as well as any claims for uninsured liabilities or in excess of insured liabilities, would divert our management’s attention from our business and could result in significant financial liability.

Risks Related to our Intellectual Property

If third parties assert that we have infringed their patents or other proprietary rights or challenge our patents or other proprietary rights, we may become involved in disputes and litigation that would be costly, time consuming and have a negative impact on the commercialization of our current products and delay or prevent development or commercialization of our product candidates.

We may be exposed to future litigation or other dispute with third parties based on claims that our products, product candidates or proprietary technologies infringe their intellectual property rights, or we may be required to enter into litigation to enforce patents issued or licensed to us or to determine the ownership, scope or validity of our or another party’s proprietary rights, including a challenge as to the validity and scope of our issued and pending claims. From time to time, we have been, and in the future may become, involved in various administrative proceedings related to our intellectual property which can cause us to incur certain legal expenses. If we become involved in any litigation and/or other administrative proceedings related to our intellectual property or the intellectual property of others, we will incur substantial additional expenses and it will divert the efforts of our technical and management personnel.

If we or our collaborators are unsuccessful in defending or prosecuting our issued and pending claims or in defending potential claims against our products, for example, as may arise in connection with the commercialization of HEPLISAV-B or any similar or other product candidate, we or our collaborators could be required to pay substantial damages or be unable to commercialize our product candidates or use our proprietary technologies without a license from such third party. A license may require the payment of substantial fees or royalties, require a grant of a cross-license to our intellectual property or technologies or may not be available on acceptable terms, if at all. Any of these outcomes could require us to change our business strategy and could materially impact our business, operations or financial condition.

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If the combination of patents, trade secrets and contractual provisions that we rely on to protect our intellectual property is inadequate, the value of our products or product candidates may decrease, and we may be unable to realize any commercial benefit from the development of our products or product candidates.

Our success depends on our ability to:

•obtain and protect commercially valuable patents or the rights to patents both domestically and abroad;

•operate without infringing upon the proprietary rights of others; and

•prevent others from successfully challenging or infringing our proprietary rights.

We will be able to protect our proprietary rights from unauthorized use only to the extent that these rights are covered by valid and enforceable patents for a commercially sufficient term or are otherwise effectively maintained as trade secrets. We try to protect our proprietary rights by filing and prosecuting U.S. and foreign patent applications. However, in certain cases such protection may be limited, depending in part on existing patents held by third parties, or other disclosures which impact patentability, which may only allow us to obtain relatively narrow patent protection, if any at all. In the U.S., and worldwide, legal standards relating to the validity and scope of patent claims in the biopharmaceutical field can be highly uncertain, are still evolving and involve complex legal and factual questions for which important legal principles remain unresolved. Changes in U.S. patent and ex-U.S. patent laws could diminish the value of patents in general, thereby impairing us and our collaborators’ ability to protect our products.

Our HEPLISAV-B vaccine and CpG 1018 adjuvant have no composition of matter patent protection in the United States or elsewhere. We must therefore rely primarily on the protection afforded by method of use patent claims relating to HEPLISAV-B vaccine and the use of CpG 1018 adjuvant in vaccines, and trade secret protection and confidentiality and other agreements to protect our interests in proprietary know-how related to HEPLISAV-B vaccine and CpG 1018 adjuvant. We have three issued U.S. patents relating to certain uses of HEPLISAV-B that are projected to expire in 2032. We have filed patent applications claiming compositions and methods of use of CpG 1018 adjuvant for COVID-19 and other vaccines, but we cannot provide any assurances that we will receive an issued patent for any of these patent applications or that, if issued, any of these patents will provide adequate protection for any intended use of CpG 1018 adjuvant in vaccines. In addition, we are or may be subject to co-ownership of the underlying intellectual property with our collaborators and, therefore, may not be the sole owner and be in a position to diligently control patent prosecution, or enforce our rights. If we are unable to adequately obtain patent protection or enforce our other proprietary rights relating to CpG 1018 adjuvant, we may be unable to realize any recurring commercial benefit from the development of a vaccine containing CpG 1018 adjuvant, and we may not have the ability to prevent others from developing or commercializing a vaccine containing CpG 1018 adjuvant.

We also rely on trade secret protection and confidentiality and other agreements to protect our interests in proprietary know-how related to CpG 1018 adjuvant. If we or our collaborators are unable to adequately obtain, protect or enforce our proprietary rights relating to CpG 1018 adjuvant, we may be unable to realize recurring commercial benefit from the development of a vaccine containing CpG 1018 adjuvant, and we or our collaborators may not have the ability to prevent others from developing or commercializing a vaccine containing the adjuvant. Disputes or litigation may also arise with our collaborators (with us and/or with one or more third parties), including disputes over ownership rights to intellectual property, know-how or technologies developed with our collaborators.

Because patent applications in the U.S. and many foreign jurisdictions typically are not published until 18 months after filing and publications of discoveries in the scientific literature lag behind actual discoveries, we cannot be certain that we were the first to file for protection of the inventions set forth in these patent applications or in our issued patents. Further, there could be post-grant proceedings such as inter partes review ("IPR"), post grant review ("PGR"), reexamination, reissue or opposition which could result in claims in our patents being narrowed or invalidated.

Our commercial success depends significantly on our ability to operate without infringing patents and other proprietary rights of third parties. A number of pharmaceutical companies and biotechnology companies, as well as universities and research institutions, may have filed patent applications or may have been granted patents that cover inventions similar to the inventions owned by or licensed to us. We may not be able to determine with certainty whether patents or patent applications of other parties may materially affect our ability to make, use, offer to sell, or sell any products. If another party controls patents or patent applications covering our products, we may not be able to obtain the rights we need to those patents or patent applications in order to commercialize our products.

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Litigation may be necessary to enforce patents issued or licensed to us or to determine the scope or validity of another party’s proprietary rights. The existence of third-party patent applications and patents could significantly reduce the coverage of the patents owned by or licensed to us and limit our ability to obtain meaningful patent protection. Litigation or any other proceedings could result in substantial costs to and diversion of effort by us, and an adverse outcome in a court or patent office could subject us to significant liabilities, require disputed rights to be licensed from other parties, or require us to cease using some of our technology. We may not prevail in these actions or proceedings if they arise.

In addition, other parties may duplicate, design around or independently develop similar or alternative technologies to ours or our licensors.

The risks and uncertainties that we face with respect to our patents and other proprietary rights include the following:

•we may not receive an issued patent for any of our patent applications or for any patent applications that we may have exclusively licensed, now or in the future;

•the pending patent applications we have filed or to which we have exclusive rights may take longer than we expect to result in issued patents;

•the claims of any patents that are issued may not provide meaningful protection or may not be valid or enforceable;

•we might not be able to develop additional proprietary technologies that are patentable;

•the patents licensed or issued to us or our collaborators may not provide a competitive advantage;

•patents issued to other parties may limit our intellectual property protection or harm our ability to do business;

•other parties may independently develop similar or alternative technologies or duplicate our technologies and commercialize discoveries that we attempt to patent;

•other parties may design around technologies we have licensed, patented or developed;

•pending patent applications or issued patents may be challenged by third parties in litigation or other proceedings, such as inter partes reviews, pre- and post-grant oppositions, reexaminations, derivation proceedings and post-grant review, in the U.S or abroad;

•we may be subject to claims that our employees or consultants have used or disclosed trade secrets or other proprietary information of their former employers or clients, thus putting our intellectual property at risk;

•our reliance on trade secret protection and confidentiality and other agreements may not be sufficient to protect our interests and proprietary know-how related to our products and processes; and

•it may be found that we or our collaborators have not complied with various procedural, document submission, fee payment and other requirements imposed by patent offices, and our patent protection could be reduced or eliminated.

We also rely on trade secret protection and confidentiality agreements to protect our interests in proprietary know-how that may not be directed to what is considered to be patentable subject matter, and for processes for which patents are difficult to enforce. We cannot be certain that we will be able to protect our trade secrets or other proprietary know-how adequately. Any disclosure of confidential data in the public domain or to third parties could allow our competitors to learn our trade secrets. If we are unable to adequately obtain or enforce proprietary rights, we may be unable to commercialize or continue to commercialize our products, enter into or maintain collaborations, generate revenues or maintain any advantage we may have with respect to existing or potential competitors.

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We have in the past, and may in the future, rely on licenses to intellectual property from third parties. Impairment of these licenses or our inability to obtain or maintain them could severely harm our business.

Our current or future research and development efforts may depend in part upon our license arrangements for certain intellectual property owned by or co-owned with third parties. Our dependence on these licenses could subject us to numerous risks, such as disputes regarding the use of the licensed intellectual property and the creation and ownership of new discoveries under such license agreements. In addition, these license arrangements could require us to make timely payments to maintain our licenses and typically contain diligence or milestone-based termination provisions. Our failure to meet any obligations pursuant to such agreements could allow licensors to terminate our agreements or undertake other remedies such as converting exclusive to non-exclusive licenses if we are unable to cure or obtain waivers for such failures or amend such agreements on terms acceptable to us or at all. In addition, license agreements may be terminated or may expire by their terms, and we may not be able to maintain the exclusivity of these licenses or any rights to the underlying intellectual property. If we cannot obtain and maintain licenses that are advantageous or necessary to the development or the commercialization of our products or product candidates, we may be required to expend significant time and resources to develop or license similar technology or to find other alternatives to maintaining the competitive position of our products or product candidates. If such alternatives are not available to us in a timely manner or on acceptable terms, we may be unable to develop or commercialize certain of our products or product candidates. In the absence of a current license, we may be required to redesign our technology so it does not infringe a third-party’s intellectual property (including patents), which may not be possible or could require substantial funds and time.

We may be subject to claims that we or our employees or consultants have wrongfully used or disclosed alleged trade secrets of our employees’ or consultants’ former employers or their clients. These claims may be costly to defend and if we do not successfully do so, we may be required to pay monetary damages and may lose valuable intellectual property rights or personnel.

Many of our employees or consultants may have been previously employed in other biopharmaceutical companies, including our competitors or potential competitors. Some of these individuals executed proprietary rights, non-disclosure and non-competition agreements in connection with such previous employment or engagements. Although no claims against us are currently pending, we may be subject to claims that these employees or consultants or we have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of their former employers or clients. Litigation may be necessary to defend against these claims. If we fail in defending such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel. A loss of key research personnel or their work product could hamper our ability to develop and ultimately commercialize, or prevent us from developing and commercializing, our product candidates, which could severely harm our business. Even if we are successful in defending against these claims, litigation could result in substantial costs and be a distraction to management.

We may rely, in some circumstances, on trade secrets and confidentiality agreements to protect our technology. Although trade secrets are difficult to protect, wherever possible, we use confidential disclosure agreements to protect the proprietary nature of our technology. Our standard practice is to require each of our collaborators, commercial partners, employees, consultants, contractors and advisors to enter into an agreement before beginning their employment, consulting or advisory relationship with us that in general provides that the individuals must keep confidential and not disclose to other parties any of our confidential information developed or learned by the individuals during the course of their relationship with us except in limited circumstances. These agreements with employees, consultants and contractors also generally provide that we own all inventions conceived by the individuals in the course of rendering their employment or services to us. However, there can be no assurance that these agreements will not be breached, that we will have adequate remedies for any breach, or that our trade secrets and/or proprietary information will not otherwise become known or be independently discovered by competitors. To the extent that our employees, consultants or contractors use intellectual property owned by others in their work for us, disputes may also arise as to the rights in related or resulting know-how and inventions, which could result in substantial costs which could severely harm our business.

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

Periodic maintenance fees, renewal fees, annuity fees and various other governmental fees on patents and/or applications are due to be paid to the United States Patent and Trademark Office and various governmental patent agencies outside of the United States in several stages over the lifetime of the patents and/or applications. We employ reputable law firms and other professionals to help us comply, and in many cases an inadvertent lapse can be cured by payment of a late fee or by other means in accordance with the applicable rules. However, there are situations in which non-compliance can result in abandonment or lapse of the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdictions, and in such an event, our competitors might be able to enter the market.

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

The biopharmaceutical patent environment outside the U.S. is also uncertain. We may be particularly affected by this uncertainty since several of our product candidates or our collaborators’ vaccine candidates may initially address market opportunities outside the U.S., where we may only be able to obtain limited patent protection, if any at all. For example, while many countries such as the U.S. permit method of use patents or patent claims relating to the use of drug products, in some countries the law relating to patentability of such use claims is evolving, or may prohibit certain activities, and may be unfavorably interpreted to prevent us from successfully prosecuting some or all of our pending patent applications. There are some countries that currently do not allow such method of use patents or patent claims, or that significantly limit the types of uses, claims or subject matter that are patentable.

Patents are of national or regional effect. Filing, prosecuting and defending patents on all of our products and product candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the U.S. can be less extensive than those in the U.S. In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the U.S. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the U.S. or from selling or importing products made using our inventions in and into the U.S. or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and, further, may export otherwise infringing products to territories where we have patent protection, but enforcement is not as strong as that in the U.S. These competitor products may compete with our products and product candidates, and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Geo-political actions in the U.S. and in foreign countries could increase the uncertainties and costs surrounding the prosecution or maintenance of our patent applications or those of any current or future licensors and the maintenance, enforcement or defense of our issued patents or those of any current or future licensors.

Various companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of many countries do not favor the enforcement of patents and other intellectual property protection, particularly those relating to pharmaceuticals, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights.

Various countries outside the U.S. have compulsory licensing laws under which a patent owner may be compelled to grant licenses to third parties. In addition, many countries limit the enforceability of patents against government agencies or government contractors. As a result, a patent owner may have limited remedies in certain circumstances, which could materially diminish the value of such patent. If we are forced to grant a license to third parties with respect to any patents relevant to our business, our competitive position may be impaired, and our business, financial condition, results of operations and prospects may be adversely affected. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

Further, the standards applied by the USPTO, foreign patent offices and other adjudicating bodies in granting and/or adjudicating patents are not always applied uniformly or predictably. As such, we do not know the degree of future protection that we will have on our products and product candidates.

Changes in U.S. patent law or the patent law of other countries or jurisdictions could diminish the value of patents in general, thereby impairing our ability to protect our products.

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Changes in either the patent laws or interpretation of the patent laws in the U.S. or in other jurisdictions could increase the uncertainties and costs surrounding the prosecution of patent applications and the enforcement or defense of issued patents. In the U.S., numerous recent changes to the patent laws and proposed changes to the rules of the USPTO may have a significant impact on our ability to protect our technology and enforce our intellectual property rights.

For example, the America Invents Act, involved significant changes in patent legislation. Additionally, the U.S. Supreme Court has ruled on several patent cases in recent years, some of which cases either narrow the scope of patent protection available in certain circumstances or weaken the rights of patent owners in certain situations.

For example, in Europe, a new unitary patent system took effect June 1, 2023, which will significantly impact European patents, including those granted before the introduction of such a system. Under the unitary patent system, European applications have the option, upon grant of a patent, of becoming a Unitary Patent which will be subject to the jurisdiction of the Unitary Patent Court ("UPC"). As the UPC is a new court system, there is no precedent for the court, increasing the uncertainty of any litigation. Patents granted before the implementation of the UPC will have the option of opting out of the jurisdiction of the UPC and remaining as national patents in the UPC countries. Patents that remain under the jurisdiction of the UPC will be potentially vulnerable to a single UPC-based revocation challenge that, if successful, could invalidate the patent in all countries who are signatories to the UPC. We cannot predict with certainty the long-term effects of any potential changes.

Risks Related to our Common Stock

Our stock price is subject to volatility, and your investment may suffer a decline in value.

The market prices for securities of biopharmaceutical companies have in the past been, and are likely to continue in the future to be, very volatile. The market price of our common stock is subject to substantial volatility depending upon many factors, many of which are beyond our control, including:

•impact of COVID-19 or other respiratory or seasonal vaccination initiatives on our HEPLISAV-B vaccine, CpG 1018 adjuvant, or other product revenue;

•progress or results of any of our clinical trials or regulatory or manufacturing efforts, in particular any announcements regarding the progress or results of our planned trials and BLA filing and communications, from the FDA or other regulatory authorities;

•our ability to receive timely regulatory approval for our product candidates;

•our ability to establish and maintain collaborations for the development and commercialization of our product candidates;

•our ability to raise additional capital to fund our operations, to the extent needed;

•technological innovations, new commercial products or drug discovery efforts and preclinical and clinical activities by us or our competitors;

•changes in our intellectual property portfolio or developments or disputes concerning the proprietary rights of our products or product candidates;

•our ability to obtain component materials and successfully enter into manufacturing relationships for our products or product candidates or establish manufacturing capacity on our own;

•our ability to establish and maintain licensing agreements for intellectual property necessary for the development of our product candidates;

•changes in government regulations, general economic conditions or industry announcements;

•changes in the structure of healthcare payment systems;

•issuance of new or changed securities analysts’ reports or recommendations;

•actual or anticipated fluctuations in our quarterly financial and operating results;

•the volume of trading in our common stock;

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•investor perceptions or negative announcements by our customers, competitors or suppliers regarding their own performance; and

•industry conditions and general financial, economic and political instability.

The stock markets in general, and the markets for biotechnology and pharmaceutical stocks in particular, have historically experienced significant volatility that has often been unrelated or disproportionate to the operating performance of particular companies. Changes in the broader macroeconomic condition, including historically high inflation, changes in interest rates, government tapering policies, impact of pandemics or endemics and instances of geopolitical instability, such as that resulting from the conflicts in the Middle East and Ukraine, can and have caused changes in market prices, notwithstanding a lack of fundamental change in the underlying business models or prospects of companies. These broad market fluctuations have adversely affected and may in the future adversely affect the market price of our common stock, regardless of our actual operating performance.

One or more of these factors could cause a substantial decline in the price of our common stock. In addition, securities class action and shareholder derivative litigation have often been brought against a company following a decline in the market price of its securities. We have in the past been, and we may in the future be, the target of such litigation. Securities and shareholder derivative litigation could result in substantial costs, and divert management’s attention and resources, which could harm our business, operating results and financial condition.

Future sales of our common stock or the perception that such sales may occur in the public market could cause our stock price to fall.

Sales of a substantial number of shares of our common stock in the public market, or the perception that these sales might occur, could depress the market price of our common stock and could impair our ability to raise capital through the sale of additional equity securities.

Under our universal shelf registration statement, we may sell any combination of common stock, preferred stock, debt securities and warrants in one or more offerings, including pursuant to our sales agreement with Cowen & Company, LLC, under which we can offer and sell our common stock from time to time up to aggregate sales proceeds of $120.0 million. As of December 31, 2023, we had approximately $120.0 million of our common stock remaining available for future issuance under our sales agreement with Cowen & Company, LLC. The sale or issuance of our securities, including those issuable upon exercise of the outstanding warrants or conversion of the preferred stock, as well as the existence of outstanding options and shares of common stock reserved for issuance under our option and equity incentive plans also may adversely affect the terms upon which we are able to obtain additional capital through the sale of equity securities.

Risks Related to Our Outstanding Convertible Notes

Servicing our debt requires a significant amount of cash, and we may not have sufficient cash flow from our business to pay our substantial debt.

Our ability to make scheduled payments of the principal of, to pay interest on or to refinance our indebtedness, including the $225.5 million in Convertible Notes, depends on our future performance, which is subject to economic, financial, competitive and other factors beyond our control. Our business may not continue to generate cash flow from operations in the future sufficient to service our debt and make necessary capital expenditures. If we are unable to generate such cash flow, we may be required to adopt one or more alternatives, such as selling assets, restructuring debt or obtaining additional equity capital on terms that may be onerous or highly dilutive. Our ability to refinance our indebtedness will depend on the capital markets and our financial condition at such time. We may not be able to engage in any of these activities or engage in these activities on desirable terms, which could result in a default on our debt obligations.

We may not have the ability to generate or raise the funds necessary to settle conversions of the Convertible Notes in cash or to repurchase the notes for cash upon a fundamental change, and our future debt may contain limitations on our ability to pay cash upon conversion or repurchase of the Convertible Notes.

Holders of the Convertible Notes will have the right, subject to certain conditions and limited exceptions, to require us to repurchase all or a portion of their Convertible Notes upon the occurrence of a fundamental change at a fundamental change repurchase price equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase date. In addition, upon conversion of the

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Convertible Notes, unless we elect to deliver solely shares of our common stock to settle such conversion (other than paying cash in lieu of delivering any fractional share), we will be required to make cash payments in respect of the Convertible Notes being converted. Moreover, we will be required to repay the Convertible Notes in cash at their maturity unless earlier converted, redeemed or repurchased. However, we may not have enough available cash or be able to obtain financing at the time we are required to make repurchases of Convertible Notes surrendered therefore or pay cash with respect to Convertible Notes being converted. In addition, our ability to repurchase the Convertible Notes or to pay cash upon conversions of the Convertible Notes may be limited by law, by regulatory authority or by agreements governing our future indebtedness. Our failure to repurchase Convertible Notes at a time when the repurchase is required by the indenture governing the Convertible Notes or to pay any cash payable on future conversions of the Convertible Notes as required by the indenture governing the Convertible Notes would constitute a default under the indenture governing the Convertible Notes. A default under the indenture governing the Convertible Notes or the occurrence of a fundamental change itself could also lead to a default under agreements governing our future indebtedness. Moreover, the occurrence of a fundamental change under the indenture governing the Convertible Notes could constitute an event of default under any agreements governing our future indebtedness. If the repayment of the related indebtedness were to be accelerated after any applicable notice or grace periods, we may not have sufficient funds to repay the indebtedness and repurchase the Convertible Notes or make cash payments upon conversions thereof.

The conditional conversion feature of the Convertible Notes may adversely affect our financial condition and operating results.

From October 1 through December 31, 2023, the conditions allowing holders to convert all or any portion of their Convertible Notes were not met. In the event the conditional conversion feature of the Convertible Notes is triggered, holders of Convertible Notes will be entitled to convert their Convertible Notes at any time during specified periods at their option. If one or more holders elect to convert their Convertible Notes, unless we elect to satisfy our conversion obligation by delivering solely shares of our common stock (other than paying cash in lieu of delivering any fractional share), we would be required to settle a portion or all of our conversion obligation through the payment of cash, which could adversely affect our liquidity. In addition, even if holders do not elect to convert their Convertible Notes, we could be required under applicable accounting rules to reclassify all or a portion of the outstanding principal of the Convertible Notes as a current rather than long-term liability, which would result in a material reduction of our net working capital.

Conversion of the Convertible Notes may dilute the ownership interest of our stockholders or may otherwise depress the price of our common stock.

From October 1 through December 31, 2023, the conditions allowing holders to convert all or any portion of their Convertible Notes have not been met. In the event the conditional conversion feature of the Convertible Notes is triggered, the conversion of some or all of the Convertible Notes to shares of common stock may dilute the ownership interests of our stockholders. Upon conversion of the Convertible Notes, we have the option to pay or deliver, as the case may be, cash, shares of our common stock, or a combination of cash and shares of our common stock. If we elect to settle our conversion obligation in shares of our common stock or a combination of cash and shares of our common stock, any sales in the public market of our common stock issuable upon such conversion could adversely affect prevailing market prices of our common stock. In addition, the existence of the Convertible Notes may encourage short selling by market participants because the conversion of the Convertible Notes could be used to satisfy short positions, or anticipated conversion of the Convertible Notes into shares of our common stock could depress the price of our common stock.

Certain provisions in the indenture governing the Convertible Notes may delay or prevent an otherwise beneficial takeover attempt of us.

Certain provisions in the indenture governing the Convertible Notes may make it more difficult or expensive for a third party to acquire us. For example, the indenture governing the Convertible Notes will require us, subject to certain exceptions, to repurchase the Convertible Notes for cash upon the occurrence of a fundamental change and, in certain circumstances, to increase the conversion rate for a holder that converts its Convertible Notes in connection with a make-whole fundamental change. A takeover of us may trigger the requirement that we repurchase the Convertible Notes and/or increase the conversion rate, which could make it more costly for a potential acquirer to engage in such takeover. Such additional costs may have the effect of delaying or preventing a takeover of us that would otherwise be beneficial to investors.

The Capped Calls may affect the value of the Convertible Notes and our common stock.

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In connection with the issuance of the Convertible Notes, we have entered into capped call transactions with the option counterparties totaling $27.2 million (the "Capped Calls"). The Capped Calls cover, subject to customary adjustments under the terms of the Capped Calls, the number of shares of common stock that initially underlie the Capped Calls. The Capped Calls are expected to offset the potential dilution to our common stock as a result of any conversion of the Convertible Notes, subject to a cap based on the cap price.

In connection with establishing their initial hedges of the Capped Calls, we have been advised that the option counterparties and/or their respective affiliates entered into various derivative transactions with respect to our common stock concurrently with or shortly after the pricing of the Convertible Notes and/or purchased shares of our common stock concurrently with or shortly after the pricing of the Convertible Notes. In addition, the option counterparties and/or their respective affiliates may modify their hedge positions by entering into or unwinding various derivatives with respect to our common stock and/or purchasing or selling our common stock or other securities of ours in secondary market transactions following the pricing of the Convertible Notes and prior to the maturity of the Convertible Notes (and are likely to do so on each exercise date of the Capped Calls, which are expected to occur during the 30 trading day period beginning on the 31st scheduled trading day prior to the maturity date of the Convertible Notes, or following any termination of any portion of the Capped Calls in connection with any repurchase, redemption or early conversion of the Convertible Notes). This activity could also cause or avoid an increase or a decrease in the market price of our common stock or the Convertible Notes.

We are subject to counterparty risk with respect to the capped call transactions.

The option counterparties are financial institutions, and we will be subject to the risk that any or all of them might default under the Capped Calls. Our exposure to the credit risk of the option counterparties will not be secured by any collateral.

If an option counterparty becomes subject to insolvency proceedings, we will become an unsecured creditor in those proceedings with a claim equal to our exposure at that time under the Capped Calls with such option counterparty. Our exposure will depend on many factors but, generally, an increase in our exposure will be correlated to an increase in the market price and in the volatility of our common stock. In addition, upon a default by an option counterparty, we may suffer adverse tax consequences and more dilution than we currently anticipate with respect to our common stock. We can provide no assurances as to the financial stability or viability of the option counterparties.

General Risk Factors

The loss of key personnel could delay or prevent achieving our objectives. In addition, our continued growth to support commercialization may result in difficulties in managing our growth and expanding our operations successfully.

We depend on our senior executive officers, as well as other key scientific personnel. Our commercial and business efforts could be adversely affected by the loss of one or more key members of our commercial or management staff, including our senior executive officers. We currently have no key person insurance on any of our employees.

As our operations expand, we expect that we will need to manage additional relationships with various vendors, partners, suppliers and other third parties. Future growth will impose significant added responsibilities on members of management. Our future financial performance and our ability to successfully commercialize HEPLISAV-B, or other future products we may attempt to commercialize, and to compete effectively will depend, in part, on our ability to manage any future growth effectively. To that end, we must be able to effectively manage our commercialization efforts, research efforts and clinical trials and hire, train and integrate additional regulatory, manufacturing, administrative, and sales and marketing personnel. We may not be able to accomplish these tasks, and our failure to accomplish any of them could prevent us from successfully growing and achieving profitability.

Our business operations are vulnerable to interruptions by natural disasters, health epidemics and other catastrophic events beyond our control, the occurrence of which could materially harm our manufacturing, distribution, sales, business operations and financial results.

Our business operations are subject to interruption by natural disasters and other catastrophic events beyond our control, including, but not limited to, earthquakes, hurricanes, fires, droughts, tornadoes, electrical blackouts, public health crises and pandemics, war, terrorism, bank failures and geo-political unrest and uncertainties. We have not undertaken a systematic analysis of the potential consequences to our business that might result from any such natural disaster or other catastrophic event and have limited recovery plans in place. If any of these events occur, our manufacturing and supply chain,

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distribution, sales and marketing efforts and other business operations could be subject to business shutdowns or disruptions and financial results could be adversely affected. We cannot presently predict the scope and severity of any potential business shutdowns or disruptions resulting from these events, but if we or any of the third parties with whom we engage, including the suppliers, contract manufacturers, distributors and other third parties with whom we conduct business, were to experience shutdowns or other business disruptions, our ability to conduct our business in the manner and on the timelines presently planned could be materially and adversely affected in a number of ways, some of which are not predicable.

Our business could be adversely affected by health epidemics in regions where we have manufacturing facilities, sales activities or other business operations. For example, outbreaks of epidemic or pandemic diseases, such as COVID-19, or the fear of such events, have and could again in the future cause restrictions on supply chains, restrict access to workplaces and affect employee health and availability. Furthermore, during the peak of the COVID-19 pandemic there was a significantly reduced utilization of all adult vaccines (other than COVID-19 vaccines), including a reduced utilization of HEPLISAV-B.

Although we maintain inventories of HEPLISAV-B and its components, our ability and those of our contractors and distributors to produce and distribute HEPLISAV-B could be adversely affected. A pandemic or similar health challenge could severely impact the U.S. healthcare system, which may have an adverse effect on usage and sales of HEPLISAV-B. In addition, any such event could result in widespread global health crisis that could adversely affect global economies and financial markets resulting in an economic downturn that could affect the demand for HEPLISAV-B and future revenue and operating results and our ability to raise additional capital when needed on acceptable terms, if at all.

Additionally, our corporate headquarters in Emeryville, California, is located in a seismically active region that also is subject to possible electrical shutdowns and wildfires. Because we do not carry earthquake insurance for earthquake-related losses and significant recovery time could be required to resume operations, our financial condition and operating results could be materially adversely affected in the event of a major earthquake or catastrophic event. We carry only limited business interruption insurance that would compensate us for actual losses from interruption of our business that may occur, and any losses or damages incurred by us in excess of insured amounts could adversely affect our business and operations.

If our information technology systems or those of third parties upon which we rely, or our data are or were compromised, we could experience adverse consequences resulting from such compromise, including but not limited to regulatory investigations or actions; litigation; fines and penalties; disruptions of our business operations; reputational harm; loss of revenue or profits; and other adverse consequences.

Our business is increasingly dependent on critical, complex and interdependent information technology systems, including internet-based systems, to support business processes as well as internal and external communications. In addition, our dependence on information technology systems has intensified because many of our critical business activities are now being conducted remotely in our remote-first work environment. The size and complexity of our computer systems make them potentially vulnerable to breakdown, malicious intrusion and computer viruses that may result in the impairment of key business processes.

In addition, our systems, along with those of our customers, suppliers, or third-party service providers which operate critical business systems to process sensitive information in a variety of contexts are potentially vulnerable to a variety of evolving threats and data security breaches—whether by employees or others—that may expose sensitive data to unauthorized persons. Such threats could include, but not be limited to social-engineering attacks (including through phishing attacks), online and offline fraud, malicious code (such as viruses and worms), malware (including as a result of advanced persistent threat intrusions), denial-of-service attacks, access attacks (such as credential stuffing or credential harvesting), personnel misconduct or error, ransomware attacks, supply-chain attacks, software bugs, server malfunctions, software or hardware failures, loss of data or other information technology assets, adware, telecommunications failures, earthquakes, fires, floods, and other similar threats. Such threats are prevalent and continue to rise, are increasingly difficult to detect, and come from a variety of sources, including traditional computer “hackers,” threat actors, “hacktivists,” organized criminal threat actors, personnel (such as through theft or misuse), sophisticated nation states, and nation-state-supported actors.

Ransomware attacks, including by organized criminal threat actors, nation-states, and nation-state-supported actors, are becoming increasingly prevalent and severe and can lead to significant interruptions in our operations, loss of data and income, reputational harm, and diversion of funds. Extortion payments may alleviate the negative impact of a ransomware attack, but we may be unwilling or unable to make such payments due to, for example, applicable laws or regulations prohibiting such payments. Similarly, supply-chain attacks have increased in frequency and severity, and we cannot guarantee that third parties and infrastructure in our supply chain or our third-party partners’ supply chains have not been compromised or that they do not contain exploitable flaws or bugs that could result in a breach of or disruption to our

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information technology systems (including our products or the third-party information technology systems that support us and our goods). If our third-party service providers experience a security incident or other interruption, we could experience adverse consequences. While we may be entitled to damages if our third-party service providers fail to satisfy their privacy or security-related obligations to us, any award may be insufficient to cover our damages, or we may be unable to recover such award.

The potential liability and associated consequences we could suffer as a result of any such cyber events could be catastrophic and result in irreparable harm including (a) the loss of trade secrets or other intellectual property, or (b) the public exposure of personally identifiable information (including sensitive personal information) of our employees, collaborators, clinical trial patients, and others, (c) extortion and other monetary damages due to malware or business email compromise, (d) significant interruptions in our operations, or (e) other significant damages. A data security breach or privacy violation that leads to disclosure or modification of or prevents access to patient information, including personally identifiable information or protected health information, could harm our reputation, compel us to comply with federal, state and/or international data breach notification laws, subject us to mandatory corrective action, require us to verify the correctness of database contents and otherwise subject us to liability under laws and regulations that protect personal data, including, but not limited to, HIPAA, similar state data protection regulations, and the EU GDPR and UK GDPR, resulting in significant penalties; increased costs; loss of revenue; expenses of computer or forensic investigations; material fines and penalties; compensatory, special, punitive or statutory damages; litigation; consent orders regarding our privacy and security practices; requirements that we provide notices, credit monitoring services and/or credit restoration services or other relevant services to impacted individuals; adverse actions against our licenses to do business; or injunctive relief.

Compliance with these and any other applicable privacy and data security laws and regulations is a rigorous and time-intensive process, and we may be required to put in place additional mechanisms ensuring compliance with the new data protection rules. If we fail to comply with any such laws or regulations, we may face significant fines and penalties that could adversely affect our business, financial condition and results of operations. Furthermore, the laws are not consistent, and compliance in the event of a widespread data breach is costly.

U.S. and equivalent foreign authorities and international authorities warned businesses of increased cybersecurity threats from actors seeking to exploit the COVID-19 pandemic. In 2020, we experienced a cybersecurity incident known as a phishing e-mail scam, and although we do not consider its impact on us to be material, if we are unable to prevent this or other such data security breaches or privacy violations or implement satisfactory remedial measures, our operations could be disrupted, and we may suffer loss of reputation, financial loss and other regulatory penalties because of lost or misappropriated information, including sensitive patient data. Moreover, failure to maintain effective internal accounting controls related to data security breaches and cybersecurity in general could impact our ability to produce timely and accurate financial statements and could subject us to regulatory scrutiny. In addition, these breaches and other inappropriate access can be difficult to detect, and any delay in identifying them may lead to increased harm of the type described above. Moreover, 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, trade secrets or other intellectual property. While we have implemented security measures that are intended to protect our data security and information technology systems, there can be no assurance that these measures will be effective. We take steps designed to detect, mitigate, and remediate vulnerabilities in our information systems (such as our hardware and/or software, including that of third parties upon which we rely). We may not, however, detect and remediate all such vulnerabilities including on a timely basis. Further, we may experience delays in deploying remedial measures and patches designed to address identified vulnerabilities.

Such disruptions and breaches of security could have a material adverse effect on our business, financial condition and results of operations. Our contracts may not contain limitations of liability, and even where they do, there can be no assurance that limitations of liability in our contracts are sufficient to protect us from liabilities, damages, or claims related to our data privacy and security obligations. We cannot be sure that our insurance coverage will be adequate or sufficient to protect us from or to mitigate liabilities arising out of our privacy and security practices, that such coverage will continue to be available on commercially reasonable terms or at all, or that such coverage will pay future claims.

Adverse developments affecting the financial services industry may have adverse consequences on our business, financial condition and stock price.

We regularly maintain cash balances at third-party financial institutions in excess of the FDIC insurance limit. Although we assess our banking relationships as we believe necessary or appropriate, our access to funding sources in amounts adequate to finance or capitalize our current and projected future business operations could be significantly impaired by factors that affect us, the financial institutions with which we have arrangements directly, or the financial services industry or economy in general. These factors could involve financial institutions or financial services industry companies with which we have financial or business relationships, but could also include factors involving financial markets or the financial services industry generally.

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ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 1C. CYBERSECURITY

Risk Management and Strategy

We have implemented and maintain various information security processes designed to identify, assess and manage material risks from cybersecurity threats to our critical computer networks, third party hosted services, communications systems, hardware and software, and our critical data, including intellectual property, confidential information that is proprietary, strategic or competitive in nature, along with personal data and other sensitive information, including our trade secrets, data we may collect about trial participants in connection with clinical trials, and other sensitive data (“Information Systems and Data”).

Our Senior Director of IT Infrastructure & Security also functions as our information security officer (“ISO”). The ISO (as part of our security function), along with our broader internal cybersecurity, IT infrastructure, and digital technology automation functions, as well as third-party service providers, all help identify, assess and manage our cybersecurity threats and risks. Our security function identifies and assesses risks from cybersecurity threats by monitoring and evaluating our threat environment using various methods including, for example, manual tools, automated tools, subscribing to reports and services that identify cybersecurity threats, analyzing reports of threats and actors, conducting scans of the threat environment, evaluating our and our industry’s risk profile, evaluating threats reported to us, coordinating with law enforcement concerning threats, responding to proactive outreach from CISA and FBI, internal and/or external audits, conducting threat assessments for internal and external threats, third-party threat assessments, conducting vulnerability assessments to identify vulnerabilities, and use of external intelligence feeds.

Depending on the environment, we implement and maintain various technical, physical, and organizational measures, processes, standards and policies designed to help manage and mitigate material risks from cybersecurity threats to our Information Systems and Data, including, for example: a corporate security incident response plan, a vulnerability management policy, incident detection and response processes, IT systems disaster recovery procedures, risk assessments, reasonable implementation of security controls in accordance with applicable security standards/certifications, encryption of data, network security controls, data segregation, access controls, physical security, asset management, tracking and disposal, systems monitoring, employee training, penetration testing, cybersecurity insurance, dedicated cybersecurity staff/officer. We also rely on third-party vendor backup/restore, disaster recovery and business continuity procedures as stated in the respective SOC 1 and SOC 2 reports if provided by such vendors as they pertain to certain of our managed services.

Our procedures for assessment and management of material risks from cybersecurity threats are integrated into our overall risk management processes. For example, (1) cybersecurity risk is evaluated as a component of our broader enterprise risk management program, identified in our risk register and monitored and managed more specifically by our Corporate Security Incident Response Team (CSIRT); (2) the security function works with the CSIRT to help prioritize our risk management processes and help mitigate cybersecurity threats that we believe are more likely to lead to a possible material impact to our business; (3) our ISO evaluates material risks identified from cybersecurity threats against our overall business objectives and reports to the audit committee of the board of directors (the "Audit Committee"), which reviews and discusses with senior management our overall risk assessment and management.

We use third-party managed service providers to assist us in identifying, assessing, mitigating and managing potential risks from cybersecurity threats. In addition, we engage other advisors from time to time to help identify, assess, mitigate and manage new or developing risks in a changing threat landscape. Such ongoing services and periodic services include professional services from providers such as legal counsel, threat intelligence service providers, cybersecurity consultants, cybersecurity software providers, managed cybersecurity service providers, penetration testing firms, dark web monitoring services, and forensic investigators (as needed).

We use third-party service providers to perform a variety of functions throughout our business, such as application service providers, software-as-a-service providers, hosting companies, contract research organizations, contract manufacturing organizations, distributors, and other supply chain resources. We have a vendor management process to help manage cybersecurity risks associated with our use of these providers. This includes risk assessment for each vendor, review of security assessments, supplemental security questionnaires (as needed), security assessment calls with the vendor's security personnel, and imposition of certain information contractual obligations on the vendor. In addition, depending on the nature of the services provided, the sensitivity of the Information Systems and Data at issue, and the identity of the provider, our vendor management process may involve different levels of assessment designed to help identify cybersecurity risks associated with a provider and impose contractual obligations related to cybersecurity on the provider.

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For a description of the risks from cybersecurity threats that may materially affect us and how they may do so, see our risk factors under Part 1. Item 1A. Risk Factors in this Annual Report on Form 10-K, including “If our information technology systems or those of third parties upon which we rely, or our data are or were compromised, we could experience adverse consequences resulting from such compromise, including but not limited to regulatory investigations or actions; litigation; fines and penalties; disruptions of our business operations; reputational harm; loss of revenue or profits; and other adverse consequences.”

Governance

Our board of directors addresses our cybersecurity risk management as part of its general oversight function. The Audit Committee is responsible for reviewing and discussing with management our cybersecurity risk assessment and management processes, including our oversight and the steps we take to monitor and help control risks from cybersecurity threats.

Our cybersecurity risk assessment and management processes are implemented and maintained by certain of our management, including our ISO, who has over 20 years of experience in information security. Our ISO oversees a global team of information security professionals consisting of multiple full time equivalent employees in multiple countries.

Our ISO is responsible for hiring appropriate personnel, helping to integrate cybersecurity risk considerations into our overall risk management strategy, and communicating key priorities to relevant personnel. Our ISO (in coordination with our CSIRT) is also responsible for other functions, including preparing for cybersecurity incidents, approving cybersecurity processes, and reviewing security assessments and other security-related reports. Our CSIRT reviews, approves and prioritizes information security and cybersecurity policies, projects and initiatives. Executive management is responsible for prioritizing initiatives and approving budgets to allocate funding for the foregoing based on feedback from the ISO, the CSIRT and the Audit Committee.

Our cybersecurity incident response processes are designed to escalate certain cybersecurity incidents to members of management depending on the circumstances, including our ISO. The ISO works with our CSIRT to help us mitigate and remediate cybersecurity threats or incidents of which they are notified. The ISO is responsible for designing and promoting general security awareness and training, as well as defining and training relevant participants on our incident response processes. Our security and incident response processes include escalation and reporting to the CSIRT, Disclosure Committee, senior management and Audit Committee for certain information security incidents, as warranted under the circumstances.

The Audit Committee receives periodic reports from the ISO concerning our significant cybersecurity threats and risk, and the processes we have implemented to address them. The Audit Committee also has access to various reports, summaries of reports or presentations related to cybersecurity threats, risk and mitigation.

ITEM 2. PROPERTIES

As of December 31, 2023, the following are the material properties that we occupy:

Property Description	Location	Square Footage	Owned or Leased	Lease Expiration Date
Corporate headquarters office	Emeryville, CA	8,053	Leased	July 31, 2025
Manufacturing and office space	Düsseldorf, Germany	60,558	Leased	December 31, 2031
Laboratory and office space	Emeryville, CA	75,662	Leased (*)	March 31, 2031

(*) The entire 75,662 square feet have been subleased to a third party. Both our lease and sublease with the third party will continue until March 31, 2031.

We believe that our facilities are adequate to meet our requirements for the near term.

ITEM 3. LEGAL PROCEEDINGS

From time to time in the ordinary course of business, we receive claims or allegations regarding various matters, including employment, vendor and other similar situations in the conduct of our operations. We are not currently aware of any material legal proceedings involving our Company.

ITEM 4. MINE SAFETY DISCLOSURE

Not applicable.

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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information and Holders

Our common stock is traded on the Nasdaq Global Select Market under the ticker symbol “DVAX”.

As of February 20, 2024, there were approximately 39 holders of record of our common stock, one of which was Cede & Co., a nominee for Depository Trust Company (“DTC”). All of the shares of our common stock held by brokerage firms, banks and other financial institutions as nominees for beneficial owners are deposited into participant accounts at DTC and are therefore considered to be held of record by Cede & Co. as one stockholder.

Dividends

We have never paid any cash dividends on our common stock. We currently expect to retain future earnings for use in the operation and expansion of our business and do not anticipate paying any cash dividends in the foreseeable future.

Stock Performance Graph

The chart below compares total stockholder return on an investment of $100 in cash on December 31, 2018, for our common stock, the Nasdaq Stock Market (U.S. companies), and the Nasdaq Biotechnology Index. All values assume reinvestment of the full amount of all dividends.

Note: Dynavax management cautions that the stock price performance shown in the graph below should not be considered indicative of potential future stock price performance.

 

This Section is not “soliciting material,” is not deemed “filed” with the Securities and Exchange Commission and is not to be incorporated by reference in any filing of Dynavax Technologies Corporation under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or after the date hereof and irrespective of any general incorporation language in any such filing.

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Recent Sales of Unregistered Securities

None.

Issuer Purchases of Equity Securities

None.

ITEM 6. [RESERVED]

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following Management’s Discussion and Analysis of Financial Condition and Results of Operations contains forward-looking statements that involve a number of risks and uncertainties. Our actual results could differ materially from those indicated by forward-looking statements as a result of various factors, including but not limited to, the period for which we estimate our cash resources are sufficient, the availability of additional funds, as well as those set forth under “Risk Factors” and those that may be identified from time to time in our reports and registration statements filed with the Securities and Exchange Commission.

The following discussion and analysis is intended to provide an investor with a narrative of our financial results and an evaluation of our financial condition and results of operations. The discussion should be read in conjunction with the Consolidated Financial Statements and the related notes thereto set forth in “Item 8—Financial Statements and Supplementary Data.”

Overview

We are a commercial stage biopharmaceutical company developing and commercializing innovative vaccines to help protect the world against infectious diseases. Our first marketed product, HEPLISAV-B® [Hepatitis B Vaccine (Recombinant), Adjuvanted], is approved in the United States, the European Union and Great Britain for the prevention of infection caused by all known subtypes of hepatitis B virus in adults aged 18 years and older. In May 2022, we commenced commercial shipments of HEPLISAV-B in Germany.

In April 2022, the CDC's Advisory Committee on Immunization Practices ("ACIP") published its universal recommendation for hepatitis B vaccination in adults, advising that all adults aged 19-59 should be vaccinated against hepatitis B. We believe this has helped create a significantly expanded total annual market opportunity of approximately $800 million in the U.S. by 2027, with HEPLISAV-B well positioned to achieve a majority market share. Our annual revenue has continued to grow significantly since the recommendation was made, as a result of our successful efforts to capture a greater share of an expanding market.

We are advancing a pipeline of differentiated product candidates that leverage our CpG 1018 adjuvant to develop improved vaccines in indications with unmet medical needs. These programs include vaccine candidates under development for shingles, Tdap and plague. Additionally, we are working to advance product candidates utilizing our CpG 1018 adjuvant through discovery efforts and preclinical and clinical collaborations with third-party research organizations.

In addition, we manufacture and have supplied in the past, and could supply in the future, our CpG 1018 adjuvant to a number of global customers, including companies engaged in the development and manufacture of COVID-19 vaccines across a variety of vaccine platforms utilizing CpG 1018 adjuvant. While we did not recognize any CpG 1018 adjuvant revenue in 2023, we could see new demand in the future if our collaborators work through their inventory on hand and need additional supply, or new programs utilizing our adjuvant advance to later stages up to and including commercialization. However, long-term demand for CpG 1018 adjuvant supporting COVID-19 or other vaccines will be highly dependent on each customer’s ability to commercialize in respective territories and geographies where their respective COVID-19 or other vaccines are approved for use.

HEPLISAV-B® Vaccine [Hepatitis B Vaccine (Recombinant), Adjuvanted]

In Phase 3 trials, HEPLISAV-B demonstrated faster and higher rates of protection with two doses in one month compared to another currently approved hepatitis B vaccine which requires three doses over six months, with a similar safety profile. HEPLISAV-B is the only two-dose hepatitis B vaccine for adults approved in the U.S., the European Union and Great Britain.

We have worldwide commercial rights to HEPLISAV-B and we market it in the United States and the European Union. There are four other vaccines approved for the prevention of hepatitis B in the U.S.: Engerix-B and Twinrix® from GlaxoSmithKline plc, Recombivax-HB® from Merck & Co and PreHevbrio™ from VBI Vaccines Inc. In February 2021, we received Marketing Authorization of HEPLISAV-B from the European Commission for prevention of infection caused by all known subtypes of hepatitis B virus in adults aged 18 years and older. In May 2021, we entered into a commercialization agreement with Bavarian Nordic for the marketing and distribution of HEPLISAV-B in Germany, and in May 2022, we commenced commercial shipments of HEPLISAV-B in Germany. In March 2023, we received marketing authorization in Great Britain for HEPLISAV-B for the active immunization against hepatitis B virus infection caused by all known subtypes of hepatitis B virus in adults aged 18 years and older.

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All of our HEPLISAV-B sales in the U.S. are to certain wholesalers and specialty distributors whose principal customers include independent hospitals and clinics, integrated delivery networks, public health clinics and prisons, the Department of Defense, the Department of Veterans Affairs and retail pharmacies. All of our HEPLISAV-B sales in Germany are to one distributor. For the year ended December 31, 2023, HEPLISAV-B product revenue, net was $213.3 million.

CpG 1018® Adjuvant Supply for COVID-19 Vaccines

In January 2021, we entered into an agreement (together with subsequent amendments, the "CEPI Agreement") with Coalition for Epidemic Preparedness Innovations (“CEPI”) for the manufacture and reservation of a specified quantity of CpG 1018 adjuvant. In May 2021, we entered into the first amendment to the CEPI Agreement. The CEPI Agreement enables CEPI to direct the supply of CpG 1018 adjuvant to CEPI partner(s). In exchange for reserving CpG 1018 adjuvant, CEPI has agreed to provide advance payments in the form of an interest-free, unsecured, forgivable loan (the “Advance Payments”) of up to $176.4 million.

Through December 31, 2023, we have received Advance Payments totaling approximately $175.0 million pursuant to the CEPI Agreement, of which $67.3 million have been repaid and $47.4 million have been forgiven (as discussed below). As of December 31, 2023, remaining Advance Payments totaling $60.3 million were reflected in CEPI accrual long-term in our consolidated balance sheets, representing the outstanding balance of the Advance Payments relating to the Clover Supply Agreement (as defined and discussed below). As of December 31, 2022, we recorded Advance Payments of $107.7 million included in CEPI accrual. There were no deferred revenue balances related to the CEPI Agreement as of December 31, 2023.

On April 27, 2023, we entered into a waiver and second amendment to the CEPI Agreement by and between us and CEPI (the “CEPI-Bio E Assignment Agreement”). Pursuant to the CEPI-Bio E Assignment Agreement, CEPI has forgiven the entirety of the outstanding Advance Payments for CpG 1018 Materials allocated to and ordered by Bio E under the CEPI Agreement and has assumed our previous rights to $47.4 million of Bio E accounts receivable.

In June 2021, we entered into an agreement (together with subsequent amendments, the “Clover Supply Agreement”) with Zhejiang Clover Biopharmaceuticals, Inc. and Clover Biopharmaceuticals (Hong Kong) Co., Limited (collectively, “Clover”) for the commercial supply of CpG 1018 adjuvant, for use with its protein-based COVID-19 vaccine candidate, SCB-2019. Under the Clover Supply Agreement, Clover committed to purchase specified quantities of CpG 1018 adjuvant, at pre-negotiated prices pursuant to the CEPI Agreement, for use in Clover’s commercialization of vaccines containing SCB-2019 and CpG 1018 adjuvant (“Clover Product”). The Clover Supply Agreement also provides terms for Clover to order additional quantities of CpG 1018 adjuvant beyond the quantities reserved by CEPI. In 2022 and 2023, we signed four amendments to the Clover Supply Agreement. The terms and conditions of the Clover Supply Agreement were operative through December 2022, and as of December 31, 2022, we had satisfied all delivery obligations thereunder.

For CpG 1018 adjuvant reserved for Clover under the CEPI Agreement, Clover is obligated to pay us the purchase price upon the earliest of (i) the true-up exercise, (ii) within a specified period after Clover delivers Clover Product to a customer, or (iii) Clover’s receipt of payment for Clover Product from a customer. When we transfer control of CpG 1018 adjuvant that is reserved under the CEPI Agreement, we recognize product revenue and a corresponding contract asset as our right to consideration is contingent on something other than the passage of time, as outlined above.

Approximately $71.3 million relating to future amounts receivable representing a contract asset from Clover in connection with the CEPI Agreement are classified as other assets (long term) as of December 31, 2023. The classification as long term reflects the timing of expected utilization of CpG 1018 adjuvant for Clover Product expected to be sold under the CEPI Agreement. Corresponding Advance Payments of $60.3 million relating to Clover are recorded in CEPI accrual long-term in our consolidated balance sheets as of December 31, 2023. These Advance Payments may be repaid using cash collected from Clover or forgiven in accordance with the CEPI Agreement. We had no accounts receivable balance from Clover as of December 31, 2023. We did not recognize CpG 1018 adjuvant net product revenue from Clover for the year ended December 31, 2023. We recognized CpG 1018 adjuvant net product revenue of $288.0 million from Clover for the year ended December 31, 2022.

In July 2021, we entered into an agreement (together with subsequent amendments, the “Bio E Supply Agreement”) with Biological E. Limited (“Bio E”), for the commercial supply of CpG 1018 adjuvant, for use with Bio E’s subunit COVID-19 vaccine candidate, CORBEVAX™. Under the Bio E Supply Agreement, Bio E previously committed to purchase specified quantities of CpG 1018 adjuvant at pre-negotiated prices pursuant to the CEPI Agreement, for use in Bio E’s commercialization of its CORBEVAX vaccine. The Bio E Supply Agreement also provides terms for Bio E to order

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additional quantities of CpG 1018 adjuvant beyond the quantities reserved by CEPI. In June 2022 and October 2022, we entered into two amendments to the Bio E Supply Agreement (the “Bio E Amendment No. 1” and the “Bio E Amendment No. 2,” respectively, together the “Bio E Amendments”). The Bio E Amendments primarily established: (i) a new payment schedule for certain outstanding invoices related to the CEPI product to be the earlier of December 31, 2022, or receipt of certain amounts by Bio E from the Government of India in connection with their advance purchase agreement for CORBEVAX, and (ii) further modified the scope of the Bio E Supply Agreement, by reducing certain quantities of CpG 1018 adjuvant to be delivered. The terms and conditions of the Bio E Supply Agreement were operative through December 2022, and as of December 31, 2022 and we had satisfied all delivery obligations thereunder.

As of December 31, 2023, we had no accounts receivable balance from Bio E. During the first quarter of 2023, we recorded an allowance for doubtful accounts of $12.3 million, which was determined by assessing changes in Bio E’s credit risk, contemplation of ongoing negotiations relating to Bio E Amendment No. 3 (defined below), and Bio E's dependence on cash collections from the Government of India, which have been delayed and significantly reduced in connection with the overall reduction in demand for CORBEVAX from the Government of India.

On April 26, 2023, we entered into a third amendment to the Bio E Supply Agreement (the “Bio E Amendment No. 3”), and on April 27, 2023, we entered into the CEPI-Bio E Assignment Agreement. Pursuant to the CEPI-Bio E Assignment Agreement, CEPI has forgiven the entirety of remaining amounts outstanding relating to a liability for Advance Payments of $47.4 million (the “Bio E CEPI Advance Payments”) for CpG 1018 Materials allocated to Bio E, and has assumed our previous rights to collect $47.4 million of Bio E accounts receivable. Pursuant to the Bio E Amendment No. 3, we collected $14.5 million from Bio E (including $13.5 million in April 2023 and $1.0 million in August 2023). Accordingly, as of December 31, 2023, the CEPI-Bio E Assignment Agreement resulted in: (i) no accounts receivable balance, and (ii) the derecognition of $47.4 million CEPI accrual in connection with the Bio E CEPI Advance Payments. The Bio E Amendment No. 3 provides for additional future payment of either $5.5 million in the event that Bio E receives at least $125.0 million, or $12.3 million in the event that Bio E receives at least $250.0 million in future payments from the Government of India associated with its CORBEVAX product on or before August 15, 2025. These additional amounts are not considered collectible until the achievement of these future milestones.

We did not recognize CpG 1018 adjuvant net product revenue from Bio E for the year ended December 31, 2023. We recognized CpG 1018 adjuvant net product revenue of $206.2 million from Bio E for the year ended December 31, 2022.

Past performance is not a reliable indicator of future performance, however, and future revenue and associated profit or loss may therefore vary significantly. Specifically, as our CpG 1018 adjuvant customers have purchased a significant quantity of CpG 1018 adjuvant as part of their initial COVID-19 vaccine development inventory, we currently expect minimal to no CpG 1018 adjuvant revenue in 2024 associated with these arrangements. See Note 9 - Collaborative Research, Development and License Agreements, in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Annual Report on Form 10-K.

Other

In May 2021, we issued $225.5 million aggregate principal amount of 2.50% convertible senior notes due in 2026 (the “Convertible Notes”) in a private placement. Total proceeds from the issuance of the Convertible Notes, net of debt issuance and offering costs of $5.7 million, were $219.8 million. We used $190.2 million of the net proceeds to repay, in full, our outstanding debt and other obligations under our previous loan agreement with CRG Servicing LLC ("Loan Agreement") and $27.2 million of the net proceeds to pay the costs of capped call transactions (the "Capped Calls").

In connection with the issuance of the Convertible Notes, we entered into the Capped Calls with one of the initial purchasers and other financial institutions, totaling $27.2 million. The Capped Calls have an initial strike price and an initial cap price of $10.47 per share and $15.80 per share, respectively, subject to certain adjustments under the terms of the Capped Calls. The Capped Calls are freestanding and are considered separately exercisable from the Convertible Notes. The Capped Calls are expected to offset the potential dilution to our common stock as a result of any conversion of the Convertible Notes, subject to a cap based on the cap price.

Seasonality

HEPLISAV-B is currently our only revenue-producing product. We believe that HEPLISAV-B product revenue is, and will likely continue to be, subject to seasonal variations. Specifically, HEPLISAV-B product revenue has generally been, and will likely continue to be, lower in the fourth quarter of our fiscal year compared to the third quarter due to holiday schedules

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and increased focus by healthcare providers on respiratory disease vaccines, including vaccines for influenza, COVID-19 and respiratory syncytial virus, during the fall and winter months.

Critical Accounting Estimates

We prepare our consolidated financial statements in accordance with U.S. generally accepted accounting principles. In doing so, we are required to make estimates and assumptions. Our critical accounting estimates are those estimates that involve a significant level of uncertainty at the time the estimate was made, and changes in them have had or are reasonably likely to have a material effect on our financial condition or results of operations. Actual results could differ materially from our estimates. We base our estimates on past experience and other assumptions that we believe are reasonable under the circumstances, and we evaluate these estimates on an ongoing basis.

See Note 2 - Summary of Significant Accounting Policies, in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Annual Report on Form 10-K for a summary of our significant accounting policies.

Revenue Recognition

Product Revenue, Net – HEPLISAV-B

We recognize revenue when we transfer control of promised goods to the customer at the net sales price, which includes estimates such as product returns, chargebacks, discounts, rebates and other fees. While each item is more fully described in Note 2 to the Consolidated Financial Statements, the following items reflect the more critical and significant estimates used in the preparation of our consolidated financial statements. Our estimates of such items are inherently uncertain and if we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of accounts receivable reserves or revenue reserves accrual that we report in a particular period.

Product Returns: Consistent with industry practice, we offer our customers a limited right of return based on the product’s expiration date for product that has been purchased from us. We estimate the amount of our product sales that may be returned by our customers and record this estimate as a reduction of revenue in the period the related product revenue is recognized. We consider several factors in the estimation of potential product returns including expiration dates of the product shipped, the limited product return rights, available information about our customers’ inventory and other relevant factors.

Chargebacks: Our customers subsequently resell our product to healthcare providers, pharmacies and others. In addition to distribution agreements with our customers, we enter into arrangements with qualified healthcare providers that provide for chargebacks and discounts with respect to the purchase of our product. Chargebacks represent the estimated obligations resulting from contractual commitments to sell product to qualified healthcare providers at prices lower than the list prices charged to customers who directly purchase the product from us. These reserves are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue and accounts receivable. Chargeback amounts are determined at the time of resale to the qualified healthcare providers by customers, and we issue credits for such amounts generally within a few weeks of the customer’s notification to us of the resale. Reserves for chargebacks consists of credits that we expect to issue for units that remain in the distribution channel inventories at each reporting period end that we expect will be sold to the qualified healthcare providers, and chargebacks for units that our customers have sold to the qualified healthcare providers, but for which credits have not been issued.

Rebates: Under certain contracts, customers may obtain rebates for purchasing minimum volumes of our product. We estimate these rebates based upon the expected purchases and the contractual rebate rate and record this estimate as a reduction in revenue in the period the related revenue is recognized.

Inventories

Inventory is stated at the lower of cost or estimated net realizable value, on a first-in, first-out, or FIFO, basis. We primarily use actual costs to determine our cost basis for inventories. Our assessment of market value requires the use of estimates regarding the net realizable value of our inventory balances, including an assessment of excess or obsolete inventory. We determine excess or obsolete inventory based on multiple factors, including an estimate of the future demand for our products, product expiration dates and current sales levels. Our assumptions of future demand for our products are inherently uncertain and if we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of inventory reserves that we report in a particular period.

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Recent Accounting Pronouncements

See Note 2 – Summary of Significant Accounting Policies, in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Annual Report on Form 10-K for information regarding recent accounting pronouncements that are of significance, or potential significance to us.

Results of Operations

This section of this Form 10-K generally discusses 2023 and 2022 items and year-to-year comparisons between 2023 and 2022. Discussions of 2021 items and year-to-year comparisons between 2022 and 2021 that are not included in this Form 10-K can be found in "Management's Discussion and Analysis of Financial Condition and Results of Operations" in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2022.

Revenues

Revenues consist of amounts earned from product sales and other revenues. Product revenue, net, includes sales of HEPLISAV-B and CpG 1018 adjuvant.

Revenue from HEPLISAV-B product sales is recorded at the net sales price, which includes estimates of product returns, chargebacks, discounts, rebates and other fees. We sell our CpG 1018 adjuvant to our collaboration partners for use in their development and/or potential commercialization of COVID-19 vaccines. Overall, product revenue, net, reflects our best estimates of the amount of consideration to which we are entitled based on the terms of the contract.

Actual amounts of consideration ultimately received may differ from our estimates. If actual results in the future vary from our estimates, we will adjust these estimates, which would affect net product revenue and earnings in the period such variances become known.

The following is a summary of our revenues (in thousands, except for percentages):

					Increase
					(Decrease) from
	Year Ended December 31,				2022 to 2023
Revenues:	2023		2022		$			%
HEPLISAV-B	$	213,295	$	125,937	$	87,358			69	%
CpG 1018 adjuvant		-		587,708		(587,708	)		(100	)%
Total product revenue, net		213,295		713,645		(500,350	)		(70	)%
Other revenue		18,989		9,038		9,951			110	%
Total revenues	$	232,284	$	722,683	$	(490,399	)		(68	)%

HEPLISAV-B product revenue increased by $87.4 million for the year ended December 31, 2023 compared to the year ended December 31, 2022. Approximately $76.5 million of the increase was primarily due to higher volume driven by continued improvement in market share, particularly in the integrated delivery networks and retail segments, and growth in the U.S. hepatitis-B vaccine market related to the Advisory Committee on Immunization Practices ("ACIP") universal recommendation. Approximately $10.9 million of the increase was due to higher net sales price.

There was no CpG 1018 adjuvant product revenue for the year ended December 31, 2023, as we completed all obligations and product delivery under our CpG 1018 adjuvant collaboration agreements as of December 31, 2022.

As our CpG 1018 adjuvant customers have purchased a significant quantity of CpG 1018 adjuvant as part of their initial COVID-19 vaccine development inventory, we currently expect minimal to no CpG 1018 adjuvant revenue in 2024. Long-term demand for CpG 1018 adjuvant supporting COVID-19 vaccines will be highly dependent on each customer’s ability to commercialize in respective territories and geographies where their respective COVID-19 vaccine is approved for use.

Other revenue primarily includes revenue from our agreement with the DoD. During the year ended December 31, 2023, we recognized $17.6 million of revenue from our agreement with the DoD. The increase in other revenue was primarily driven by the advancement into a nonhuman primate challenge study initiated in August 2023 combined with the

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recognition of $1.3 million license fee revenue on the achievement of a milestone in connection with a collaboration and license agreement with SIIPL.

Cost of Sales – Product

Cost of sales - product, consists primarily of raw materials, certain fill, finish and overhead costs, and any inventory adjustment charges for HEPLISAV-B and inventory costs to produce CpG 1018 adjuvant for our collaboration partners.

The following is a summary of our cost of sales - product (in thousands, except for percentages):

					Increase
					(Decrease) from
	Year Ended December 31,				2022 to 2023
Cost of Sales - Product:	2023		2022		$			%
HEPLISAV-B	$	50,167	$	40,131	$	10,036			25	%
CpG 1018 adjuvant		-		222,022		(222,022	)		(100	)%
Total cost of sales - product	$	50,167	$	262,153	$	(211,986	)		(81	)%

HEPLISAV-B cost of sales-product increased by $10.0 million for the year ended December 31, 2023 compared to the year ended December 31, 2022. Approximately $20.0 million of the increase was primarily due to higher sales volume driven by continued improvement in HEPLISAV-B market share, offset by a decrease of $10.0 million due to lower per-unit manufacturing costs as the result of previous process improvements.

There was no CpG 1018 adjuvant cost of sales-product for the year ended December 31, 2023, as we satisfied all delivery obligations under our CpG 1018 adjuvant collaboration agreements as of December 31, 2022. In addition, CpG 1018 adjuvant cost of sales-product for the year ended December 31, 2022, includes certain one-time charges totaling approximately $45.4 million, comprising an inventory write-off of $34.3 million in connection with cancelled orders and the reduction in demand associated with the Clover Supply Agreement, as amended, and $11.1 million in charges related to certain non-refundable pre-payments made to one of our CMOs regarding certain raw materials costs that are not likely to be manufactured into finished goods inventory.

Research and Development Expenses

Research and development expenses are tracked on a program-by-program basis and consist primarily of costs incurred for the continued research and development of HEPLISAV-B and CpG 1018 adjuvant, clinical product candidates and preclinical studies, which include but are not limited to, compensation and related personnel costs (which include benefits, recruitment and travel costs), expenses incurred under agreements with contract research organizations, contract manufacturing organizations and service providers that assist in conducting clinical studies and costs associated with our preclinical activities, development activities and regulatory operations. We do not allocate stock-based compensation or facility expenses to specific programs because these costs are deployed across multiple programs.

The following is a summary of our research and development expenses (in thousands, except for percentages):

					Increase
					(Decrease) from
	Year Ended December 31,				2022 to 2023
Program Expenses:	2023		2022		$			%
HEPLISAV-B development	$	3,486	$	3,973	$	(487	)		(12	)%
CpG 1018 adjuvant development		2,140		2,379		(239	)		(10	)%
Tetanus, diphtheria, and acellular pertussis		6,620		8,994		(2,374	)		(26	)%
Shingles		14,252		13,943		309			2	%
Plague (1)		8,319		4,065		4,254			105	%
Other		8,210		5,421		2,789			51	%
Other Research and Development Expenses:
Facility costs		2,574		1,871		703			38	%
Non-cash stock-based compensation		9,285		5,954		3,331			56	%
Total research and development	$	54,886	$	46,600	$	8,286			18	%

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(1) In September 2021, we entered into an agreement with the DoD for the development of a recombinant plague vaccine adjuvanted with CpG 1018. Under the agreement, we are conducting a Phase 2 clinical trial and studies combining our CpG 1018 adjuvant with the DoD's rF1V vaccine. We are being fully reimbursed by the DoD for the costs of this study, which is recorded in other revenue in our consolidated statements of operations.

Research and development expenses increased by $8.3 million for the year ended December 31, 2023 compared to the year ended December 31, 2022.

•HEPLISAV-B development costs decreased due to lower clinical costs following the completion of the HEPLISAV-B dialysis study and lower other HEPLISAV-B related development costs. This was offset by a $1.1 million expense related to an engineering run performed for product testing purposes in 2023.

•CpG 1018 adjuvant development costs decreased as supply agreements were fulfilled for our collaborators utilizing CpG 1018 adjuvant in 2022.

•Shingles program costs increased as we completed activities related to the Phase 1 clinical trial, including presentation of study results at a medical conference in June 2023, and due to trial start up activities, including manufacturing of clinical materials to support the expected initiation of a Phase 1/2 clinical trial in the first half of 2024.

•Tdap costs decreased as we completed the Phase 1 clinical trial in early 2023, offset by an increase in activities to support initiation of a human challenge study expected in the second half of 2024.

•Plague program costs increased compared to the previous year following our initiation of part 2 of the Phase 2 clinical trial in early 2023 and advancement into a nonhuman primate challenge study in August 2023.

•Other program costs increased as we continue to invest in product candidates utilizing our CpG 1018 adjuvant through discovery efforts and through preclinical and clinical collaborations.

•Non-cash stock-based compensation expense increased primarily due to the need for increased headcount to support the advancement of our clinical vaccine programs.

As we continue to progress our clinical-stage pipeline, we expect research and development expenses to continue to represent a substantial portion of our expenses and to continue to increase, both in dollar amount and proportion of total expense, in future years.

Selling, General and Administrative Expenses

Selling, general and administrative expenses consist primarily of compensation and related costs for our commercial support personnel, medical education professionals and personnel in executive and other administrative functions, including legal, finance and information technology; costs for outside services such as sales and marketing, post-marketing studies of HEPLISAV-B, accounting, commercial development, consulting, business development, investor relations and insurance; legal costs that include corporate and patent-related expenses; allocated facility costs and non-cash stock-based compensation.

The following is a summary of our selling, general and administrative expenses (in thousands, except for percentages):

					Increase
					(Decrease) from
	Year Ended December 31,				2022 to 2023
Selling, General and Administrative:	2023		2022		$			%
Compensation and related personnel costs	$	63,937	$	52,865	$	11,072			21	%
Outside services		47,374		41,049		6,325			15	%
Legal costs		3,981		2,223		1,758			79	%
Facility costs		8,585		12,153		(3,568	)		(29	)%
Non-cash stock-based compensation		29,069		23,118		5,951			26	%
Total selling, general and administrative	$	152,946	$	131,408	$	21,538			16	%

Selling, general and administrative expenses increased by $21.5 million for the year ended December 31, 2023 compared to the year ended December 31, 2022.

•Compensation and related personnel costs and non-cash stock-based compensation costs increased due to continued headcount and personnel investments in our general and administrative and field sales functions to support business growth and increased travel.

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•Outside services increased due to more targeted commercial and marketing efforts to increase market share and maximize the opportunities presented by the ACIP's universal recommendation.

•Legal costs increased due to ongoing general legal activities supporting our continued growth and intellectual property activities supporting our clinical-stage pipeline.

•Facility costs decreased due to lower rent expense, as one of our leases expired in 2022, and lower depreciation expense related to furniture and fixtures fully depreciated in 2022.

•Non-cash stock-based compensation expense increased primarily due to increased headcount of our field sales team.

We expect our selling, general and administrative expenses to increase in future periods to support the overall growth in our business.

Gain on Sale of Assets

In July 2020, we sold assets related to our immuno-oncology compound, SD-101, which included intellectual property, clinical and non-clinical data, regulatory filings, clinical supply inventory and certain contracts to Surefire Medical Inc. d/b/a TriSalus Life Sciences (“TriSalus”). Pursuant to the Asset Purchase Agreement, we received $5.0 million upon closing of the transaction and $4.0 million in December 2020 as reimbursement for certain clinical trial expenses. In addition, we could receive up to an additional $250.0 million upon the achievement of certain development, regulatory, and commercial milestones and low double-digit royalties based on potential future net sales of product containing SD-101 compound.

In each of September 2023 and May 2022, we received payment of $1.0 million from TriSalus because it met a pre-commercialization milestone. In each of the third quarter of 2023 and second quarter of 2022, we recognized a gain on sale of SD-101 assets of $1.0 million in our consolidated statements of operations.

Bad Debt Expense

We recorded $12.3 million of bad debt expense during the year ended December 31, 2023 in connection with the allowance for doubtful accounts of $12.3 million recorded with respect to outstanding accounts receivable from Bio E and relating to CpG 1018 Materials delivered under the Bio E Supply Agreement and CEPI Agreement. The allowance for doubtful accounts was determined by assessing changes in Bio E’s credit risk, contemplation of ongoing negotiations relating to Bio E Amendment No. 3, and Bio E's dependence on cash collections from the Government of India, which have been delayed significantly by the Government of India.

Other Income (Expense)

Interest income is reported net of amortization of premiums and discounts on marketable securities and includes realized gains on investments. Interest expense includes the stated interest and accretion of discount of our Convertible Notes. Sublease income is recognized in connection with our sublease of office and laboratory space. Change in fair value of warrant liability reflects the changes in fair value of warrants issued in connection with equity financing in August 2019.

The following is a summary of our other income (expense) (in thousands, except for percentages):

							Increase
							(Decrease) from
	Year Ended December 31,						2022 to 2023
	2023			2022			$			%
Interest income	$	31,993		$	7,912		$	24,081			304	%
Interest expense	$	(6,757	)	$	(6,732	)	$	25			(0	)%
Sublease income	$	7,577		$	7,685		$	(108	)		(1	)%
Change in fair value of warrant liability	$	-		$	1,801		$	(1,801	)		(100	)%
Other	$	(152	)	$	111		$	(263	)		(237	)%

•Interest income increased due to higher yields and balances in our marketable securities portfolio.

•The change in the fair value of warrant liability resulted primarily from the warrants, which expired in February 2022. There were no warrants outstanding as of December 31, 2023.

•The change in other is primarily due to foreign currency transactions and related fluctuations in the value of the Euro compared to the U.S. dollar.

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Income Taxes

Our income tax expense and effective income tax rate were as follows (in thousands, except for percentages):

							Increase
							(Decrease) from
	Year Ended December 31,						2022 to 2023
	2023			2022			$		%
Income tax expense	$	2,022		$	1,143		$	879		77	%
Effective income tax rate		(46.3	)%		0.4	%		-		-

Income tax expense increased by $0.9 million for the year ended December 31, 2023 compared to the year ended December 31, 2022. Our income tax expense of $2.0 million and $1.1 million for the years ended December 31, 2023 and 2022 which is primarily comprised of state and foreign income tax expense. Our effective tax rate for the year ended December 31, 2023 was (46.3)%, which is primarily comprised of state and foreign income tax expense.

Liquidity and Capital Resources

As of December 31, 2023, we had $742.3 million in cash and cash equivalents, and marketable securities. Since our inception, we have relied primarily on the proceeds from public and private sales of our equity securities, borrowings, government grants and revenues from product sales and collaboration agreements to fund our operations. Our funds are currently invested in money market funds, U.S. treasuries, U.S. government agency securities and corporate debt securities. We currently anticipate that our cash and cash equivalents, and short-term marketable securities as of December 31, 2023, and anticipated revenues from HEPLISAV-B will be sufficient to fund our operations for at least the next 12 months from the date of this filing and in the longer term.

Advanced payments received from CEPI to reserve a specified quantity of CpG 1018 adjuvant are initially accounted for as long-term deferred revenue. When we deliver CpG 1018 adjuvant to CEPI partner(s) or when we receive payment from CEPI partner(s), we reclassify the advanced payments from long-term deferred revenue to accrued liabilities. As of December 31, 2023, we had no CEPI-related net accounts receivable relating to Bio E. CEPI-related accruals and contract assets relating to Clover totaled $60.3 million and $71.3 million as of December 31, 2023, respectively. As of December 31, 2023, the CEPI-related accrual relating to Clover may be repaid using cash to be collected from Clover or forgiven in accordance with the CEPI Agreement.

On April 26, 2023, we entered into the Bio E Amendment No. 3, and on April 27, 2023, we entered into the CEPI-Bio E Assignment Agreement. Pursuant to the CEPI-Bio E Assignment Agreement, CEPI has forgiven the entirety of remaining amounts outstanding relating to the Bio E CEPI Advance Payments for CpG 1018 Materials allocated to Bio E and has assumed our previous rights to collect $47.4 million of Bio E accounts receivable. The CEPI-Bio E Assignment Agreement resulted in no accounts receivable balance from Bio E. Pursuant to the Bio E Amendment No. 3, we collected $13.5 million from Bio E in April 2023 and subsequently collected the remaining $1.0 million in August 2023. The Bio E Amendment No. 3 provides for additional future payment of either $5.5 million in the event that Bio E receives at least $125.0 million, or $12.3 million in the event that Bio E receives at least $250.0 million in future payments from the Government of India associated with its CORBEVAX product on or before August 15, 2025. These additional amounts are not considered collectible until the achievement of these future milestones.

As of December 31, 2023, the aggregate principal amount of our Convertible Notes was $225.5 million, excluding debt discount of $2.8 million. The Convertible Notes bear interest at a rate of 2.50% per year, payable semiannually in arrears on May 15 and November 15 of each year. The Convertible Notes mature on May 15, 2026, unless converted, redeemed or repurchased in accordance with their terms prior to such date. See Note 10 – Convertible Notes, in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Annual Report on Form 10-K.

We entered into an at-the-market Sales Agreement with Cowen and Company, LLC (“Cowen”) on August 6, 2020 and an amendment to such agreement on August 3, 2023 (the sales agreement as amended, the “ATM Agreement”). Under the ATM Agreement, we may offer and sell from time to time, at our sole discretion, shares of our common stock having an aggregate offering price of up to $120.0 million through Cowen as our sales agent. We agreed to pay Cowen a commission of up to 3% of the gross sales proceeds of any common stock sold through Cowen under the ATM Agreement. As of December 31, 2023, we had approximately $120.0 million remaining under the ATM Agreement.

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Prior to January 1, 2021, we incurred net losses in each year since our inception. For the year ended December 31, 2023, we recorded a net loss of $6.4 million. For the year ended December 31, 2022, we recorded a net income of $293.2 million. We cannot be certain that sales of our products, and the revenue from our other activities will be sustainable. Further, we expect to continue to incur substantial expenses as we continue investing in commercialization of HEPLISAV-B, advancing our research and development pipeline, and investing in clinical trials and other development. If we cannot generate a sufficient amount of revenue from product sales, we will need to finance our operations through strategic alliance and licensing arrangements and/or future public or private debt and equity financings. Raising additional funds through the issuance of equity or debt securities could result in dilution to our existing stockholders, increased fixed interest payment obligations, or both. In addition, these securities may have rights senior to those of our common stock and could include covenants that would restrict our operations.

Our ability to raise additional capital in the equity and debt markets, should we choose to do so, is dependent on a number of factors, including, but not limited to, the market demand for our common stock, which itself is subject to a number of development and business risks and uncertainties, our creditworthiness and the uncertainty that we would be able to raise such additional capital at a price or on terms that are favorable to us or at all. In addition, our ability to raise additional funds may be adversely impacted by deteriorating global economic conditions and the recent or future disruptions to and volatility in the credit and financial markets in the United States and worldwide. Adequate financing may not be available to us on acceptable terms, or at all. If adequate funds are not available when needed, we may need to significantly reduce our operations while we seek strategic alternatives, which could have an adverse impact on our ability to achieve our intended business objectives.

During the year ended December 31, 2023, we generated $100.6 million of cash from our operations, which consisted of a net loss of $6.4 million, a $46.7 million of net adjustments from non-cash items, which included stock-based compensation, depreciation and amortization, amortization of right-of-use assets, non-cash interest expense, accretion of discounts on marketable securities and bad debt expense, and approximately $61.2 million net changes from operating assets and liabilities, which included a decrease of $43.3 million in accounts and other receivables, net and an increase of $19.8 million in accrued and other liabilities. By comparison, during the year ended December 31, 2022, we generated $62.7 million of cash from our operations, which consisted of our net income of $293.2 million, a $69.0 million of net adjustments from non-cash items, which included stock-based compensation, change in fair value of warrant liability, non-cash interest expense, depreciation and amortization, amortization of right-of-use assets, accretion of discount on marketable securities and inventory write-off, and approximately $298.4 million net changes from operating assets and liabilities, which included $349.9 million decrease in deferred revenue due to the fulfillment of our obligations to deliver CpG 1018 adjuvant to our collaboration partners, $24.8 million decrease in accrued liabilities and other liabilities, $159.7 million decrease in prepaid manufacturing, which converted into CpG 1018 adjuvant inventory during 2022, $32.4 million increase in inventories and $21.1 million decrease in CEPI accrual. Overall, cash provided by our operations during the year ended December 31, 2023 increased by $37.8 million compared to the same period in December 31, 2022. Net cash provided by operating activities is also impacted by changes in our operating assets and liabilities due to timing of cash receipts and expenditures.

During the year ended December 31, 2023, net cash used in investing activities was $153.9 million compared to $316.0 million of cash used in investing activities for the year ended December 31, 2022. Cash used in investing activities during the year ended December 31, 2023 included $150.8 million of net purchases of marketable securities compared to $309.9 million of net purchases of marketable securities for the year ended December 31, 2022.

During the year ended December 31, 2023, net cash provided by financing activities was $1.4 million. During the year ended December 31, 2022, net cash provided by financing activities was $19.5 million. Cash used in financing activities for the year ended December 31, 2023 included $6.5 million for the payments of taxes related to net share settlement of restricted stock units ("RSUs"), partially offset by proceeds received from the exercise of options and from share purchases under our employee stock purchase plan for $7.9 million combined. Cash provided by financing activities for the year ended December 31, 2022 included proceeds of $8.5 million from warrants exercised, and proceeds of $11.1 million from the exercise of stock options and employee stock purchase plan.

Contractual Obligations

We lease our facilities in Emeryville, California and Düsseldorf, Germany. We lease and sublease certain manufacturing and office space with lease terms ranging from 3 to 12 years. These leases require monthly lease payments that may be subject to annual increases throughout the lease term. Certain of these leases also include renewal options at our election to renew or extend the lease for two successive five-year terms. These optional periods have not been considered in

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the determination of the Right-of-use (“ROU”) assets or lease liabilities associated with these leases as we did not consider the exercise of these options to be reasonably certain.

We also sublease one of our leased premises to a third party. Rent is subject to scheduled annual increases and the subtenant is responsible for certain operating expenses and taxes throughout the life of the sublease. The sublease term expires on March 31, 2031, unless earlier terminated, concurrent with the term of our lease. The subtenant has no option to extend the sublease term. Sublease income was $7.6 million, $7.7 million and $7.7 million for the years ended December 31, 2023, 2022 and 2021, respectively. Sublease income is included in other income (expense) in our consolidated statements of operations. Rent received from the subtenant in excess of rent paid to the landlord is shared by paying the landlord 50% of the excess rent. The excess rent is considered a variable lease payment and the total estimated payments are being recognized as additional rent expense on a straight-line basis.

In May 2021, we issued $200.0 million aggregate principal amount of 2.50% convertible senior notes due 2026 in a private placement. The purchasers also partially exercised their option to purchase additional Convertible Notes in May 2021 and we issued an additional $25.5 million of the Convertible Notes. As of December 31, 2023, the aggregate principal amount of our Convertible Notes was $225.5 million, excluding debt discount of $2.8 million. The Convertible Notes bear interest at a rate of 2.50% per year, payable semiannually in arrears on May 15 and November 15 of each year, beginning on November 15, 2021. The Convertible Notes mature on May 15, 2026, unless converted, redeemed or repurchased in accordance with their terms prior to such date.

In May 2021, we repaid the principal on the term loans (the "Term Loans") under the term loan agreement (“Loan Agreement”) with CRG Servicing LLC in full. With the full repayment of the Term Loans, all security interests, covenants, liens and encumbrances under the Loan Agreement were permanently released.

We have entered into material purchase commitments with commercial manufacturers for the supply of HEPLISAV-B. In November 2013, we entered into a Commercial Manufacturing and Supply Agreement with Baxter Pharmaceutical Solutions LLC (“Baxter”) that was amended in September 2021 (as amended, the “Baxter Agreement”). Baxter provides formulation, fill and finish services and produces HEPLISAV-B for commercial use. Pursuant to the Baxter Agreement, we are obligated to purchase an annual minimum number of batches of HEPLISAV-B through December 31, 2026, and there are certain limits on the number of batches that Baxter is required to produce. As of December 31, 2023, our aggregate minimum commitment under the Baxter Agreement was $11.4 million within the next 12 months, and $24.5 million beyond the next 12 months.

On September 7, 2023 (the “Effective Date”), we entered into an agreement (the “Avecia Supply Agreement”) with Nitto Denko Avecia Inc. (“Avecia”) for the manufacture and supply of our CpG 1018 adjuvant using a specific production process. Under the Avecia Supply Agreement, Avecia has agreed to produce and supply to us quantities of CpG 1018 adjuvant ordered by us after the Effective Date. Subject to certain conditions in the Avecia Supply Agreement, we are obligated to purchase all of our annual volume requirements of CpG 1018 adjuvant from Avecia up to a specified production capacity. We may alternatively order CpG 1018 adjuvant produced using a different production process pursuant to the existing supply agreement between us and Avecia dated October 1, 2012 (the “2012 Agreement”). As of December 31, 2023, our aggregate minimum commitment for the supply of CpG 1018 adjuvant under the Avecia Supply Agreement was $7.4 million for the 12 months following December 31, 2023.

In addition to the non-cancelable commitments noted above, we have entered into contractual arrangements that obligate us to make payments to the contractual counterparties upon the occurrence of future events. In addition, in the normal course of operations, we have entered into license and other agreements and intend to continue to seek additional rights relating to compounds or technologies in connection with our discovery, manufacturing and development programs. Under the terms of the agreements, we may be required to pay future up-front fees, milestones and royalties on net sales of products originating from the licensed technologies, if any, or other payments contingent upon the occurrence of future events that cannot reasonably be estimated.

We also rely on and have entered into agreements with research institutions, contract research organizations and clinical investigators as well as clinical material manufacturers. These agreements are typically terminable by us upon reasonable written notice. Generally, we are only obligated to pay for actual time spent and materials consumed by the organizations at any point in time during the contract through the notice period.

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In conjunction with our agreement with Symphony Dynamo, Inc. and Symphony Dynamo Holdings LLC (“Holdings”) in November 2009, we agreed to make contingent cash payments to Holdings equal to 50% of the first $50 million from any upfront, pre-commercialization milestone or similar payments received by us from any agreement with any third party with respect to the development and/or commercialization of cancer and hepatitis C therapies originally licensed to Symphony Dynamo, Inc., including our immune-oncology compound, SD-101. In July 2020, we sold assets related to SD-101 to Surefire Medical, Inc. d/b/a TriSalus Life Sciences (“TriSalus”). We paid $2.5 million to Holdings in August 2020. In each of September 2021, May 2022 and September 2023, we received $1.0 million from TriSalus because it met pre-commercialization milestones. We recorded the proceeds as gain on sale of assets in our consolidated statements of operations. We paid Holdings $0.5 million in each of September 2021, May 2022 and October 2023. We included the payments in selling, general and administrative expenses in our consolidated statements of operations. No liability has been recorded under this agreement as of December 31, 2023.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Quantitative and Qualitative Disclosure about Market Risk

Interest Rate Risk

We are subject to interest rate risk. Our investment portfolio is maintained in accordance with our investment policy, which defines allowable investments, specifies credit quality standards and limits the credit exposure of any single issuer. The primary objective of our investment activities is to preserve principal and, secondarily, to maximize income we receive from our investments without significantly increasing risk. Some of the securities that we invest in may have market risk. This means that a change in prevailing interest rates may cause the principal amount of the investment to fluctuate. To minimize this risk, we maintain our portfolio of cash equivalents and investments in highly liquid investments in money market funds, U.S. government agency securities, U.S. treasuries and corporate debt securities. We do not invest in auction rate securities or securities collateralized by home mortgages, mortgage bank debt or home equity loans. We do not have derivative financial instruments in our investment portfolio. To assess our risk, we calculate that if interest rates were to rise or fall from current levels by 100 basis points or by 125 basis points, the pro forma change in fair value of investments would be $7.0 million or $9.0 million as of December 31, 2023, compared to $4.1 million or $5.1 million as of December 31, 2022, respectively.

Due to the short duration and nature of our cash equivalents and marketable securities, as well as our intention to hold the investments to maturity, we do not expect any material loss with respect to our investment portfolio.

Foreign Currency Risk

We have certain investments outside the U.S. for the operations of Dynavax GmbH, Dynavax India LLP, and a branch of Dynavax registered in Italy, with exposure to foreign exchange rate fluctuations. The cumulative translation adjustment reported in the consolidated balance sheet as of December 31, 2023 and 2022 was a $3.0 million and $4.0 million loss, respectively, primarily related to the translation of Dynavax GmbH assets, liabilities and operating results from Euros to U.S. dollars. As of December 31, 2023 and 2022, the effect of our exposure to these exchange rate fluctuations has not been material, and we do not expect it to become material in the foreseeable future. We do not hedge our foreign currency exposures and have not used derivative financial instruments for speculation or trading purposes.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

	Page No.
Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)	73
Consolidated Financial Statements:
Consolidated Balance Sheets	75
Consolidated Statements of Operations	76
Consolidated Statements of Comprehensive (Loss) Income	77
Consolidated Statements of Stockholders’ Equity	78
Consolidated Statements of Cash Flows	79
Notes to Consolidated Financial Statements	80

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Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Dynavax Technologies Corporation

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Dynavax Technologies Corporation (the Company) as of December 31, 2023 and 2022, the related consolidated statements of operations, comprehensive (loss) income, stockholders’ equity and cash flows for each of the three years in the period ended December 31, 2023, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 22, 2024 expressed an unqualified opinion thereon.

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 accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. 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 evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

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

Reserves for returns on product revenue

Description of the Matter

During the year ended December 31, 2023, the Company’s net product revenues for HEPLISAV-B were $213.3 million. As explained in Note 2 of the consolidated financial statements, revenue from product sales includes estimates of variable consideration for which reserves are established, including reserves for product returns. Auditing the Company’s measurement of reserves for HEPLISAV-B product returns under its contracts with wholesalers and specialty distributors (collectively, “Customers”) was challenging because (1) the calculation involves management assumptions about inventory remaining in the distribution channel (i.e., units held by Customers) as of the balance sheet date that could be subject to return in future periods under the Company’s returns policy, and (2) the Company has limited returns history on which to base its assumptions.

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How We Addressed the Matter in Our Audit We obtained an understanding, evaluated the design and tested the operating effectiveness of internal controls that identified risks related to the Company’s process used to determine reserves for returns on product revenue. For example, we tested controls over management’s review of the completeness and accuracy of the data used in the process and the assumptions about Customers’ units in the channel as of the balance sheet date.   To test the Company’s reserves for returns on product revenue, our audit procedures included, among other procedures, testing the accuracy and completeness of the underlying data used in the calculations and evaluating the assumptions used by management to estimate its reserves. To test management’s assumptions, we inspected agreements with significant Customers to validate the rights of return policy, obtained written representations from members of the commercial and market access functions regarding changes to the terms and conditions reported to the legal and accounting departments, examined credit memos issued during and after year end for unusual items or trends not consistent with the Company’s analysis of product returns, performed revenue cutoff testing at period end to assess whether there were unusual trends that should have been considered in the Company analysis of product returns and compared the shipment reports to Customers sell through information to assess the extent of inventory in the distribution channel. We also performed sensitivity analyses over the Company’s return rate to assess the effect of changes in assumptions.

/s/ Ernst & Young LLP
 

We have served as the Company's auditor since 2002.

San Francisco, California

February 22, 2024

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DYNAVAX TECHNOLOGIES CORPORATION

CONSOLIDATED BALANCE SHEETS

(In thousands, except per share amounts)

		December 31,
	2023				2022
Assets
Current assets:
Cash and cash equivalents		$	150,279		$	202,004
Marketable securities available-for-sale			592,023			422,391
Accounts receivables, net of allowance for doubtful accounts of $12,313 and $0 at December 31, 2023 and December 31, 2022, respectively			40,607			145,130
Other receivables			3,926			2,385
Inventories			53,290			59,446
Prepaid expenses and other current assets			18,995			85,629
Total current assets			859,120			916,985
Property and equipment, net			37,297			37,596
Operating lease right-of-use assets			24,287			25,745
Goodwill			2,067			2,006
Other assets (Note 9)			74,325			3,518
Total assets		$	997,096		$	985,850
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable		$	5,245		$	3,211
Accrued research and development			2,982			4,775
CEPI accrual (Note 9)			-			107,738
Accrued liabilities (Note 7)			49,448			30,719
Other current liabilities			4,520			3,631
Total current liabilities			62,195			150,074
Convertible Notes, net of debt discount of $2,802 and $3,922 at December 31,    2023 and December 31, 2022, respectively (Note 10)			222,698			221,578
Long-term portion of lease liabilities			29,720			32,801
CEPI accrual long-term (Note 9)			60,337			-
Other long-term liabilities			74			384
Total liabilities			375,024			404,837
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock: $0.001 par value, 5,000 shares authorized at December 31,    2023, and 2022; zero shares outstanding at December 31, 2023 and 2022			-			-
Common stock: $0.001 par value; 278,000 shares authorized at December 31,    2023 and 2022; 129,530 shares and 127,604 shares issued and outstanding at    December 31, 2023 and 2022, respectively			130			128
Additional paid-in capital			1,554,634			1,510,518
Accumulated other comprehensive loss			(2,108	)		(5,438	)
Accumulated deficit			(930,584	)		(924,195	)
Total stockholders’ equity			622,072			581,013
Total liabilities and stockholders’ equity		$	997,096		$	985,850

See accompanying notes.

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DYNAVAX TECHNOLOGIES CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share amounts)

	Year Ended December 31,
	2023			2022			2021
Revenues:
Product revenue, net	$	213,295		$	713,645		$	437,099
Other revenue		18,989			9,038			2,343
Total revenues		232,284			722,683			439,442
Operating expenses:
Cost of sales - product		50,167			262,153			173,572
Research and development		54,886			46,600			32,228
Selling, general and administrative		152,946			131,408			100,156
Gain on sale of assets (Note 8)		(1,000	)		(1,000	)		(1,000	)
Bad debt expense (Note 9)		12,313			-			-
Total operating expenses		269,312			439,161			304,956
(Loss) income from operations		(37,028	)		283,522			134,486
Other (expense) income:
Interest income		31,993			7,912			140
Interest expense		(6,757	)		(6,732	)		(11,176	)
Sublease income		7,577			7,685			7,735
Loss on debt extinguishment (Note 11)		-			-			(5,232	)
Change in fair value of warrant liability (Note 14)		-			1,801			(49,354	)
Other		(152	)		111			922
Net (loss) income before income taxes		(4,367	)		294,299			77,521
Provision for income taxes		(2,022	)		(1,143	)		(808	)
Net (loss) income	$	(6,389	)	$	293,156		$	76,713
Undistributed earnings allocated to participating securities		-			(283	)		(4,569	)
Net (loss) income allocable to common stockholders	$	(6,389	)	$	292,873		$	72,144
Net (loss) income per share allocable to common stockholders
Basic	$	(0.05	)	$	2.32		$	0.62
Diluted	$	(0.05	)	$	1.97		$	0.57
Weighted-average shares used in computing net (loss) income per share    allocable to common stockholders:
Basic		128,733			126,398			116,264
Diluted		128,733			150,797			133,006

See accompanying notes.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME

(In thousands)

	Year Ended December 31,
	2023			2022			2021
Net (loss) income	$	(6,389	)	$	293,156		$	76,713
Other comprehensive income (loss), net of tax:
Change in unrealized loss on marketable securities available-for-sale		2,251			(1,407	)		(30	)
Cumulative foreign currency translation adjustments		1,079			(1,765	)		(2,509	)
Total other comprehensive income (loss)		3,330			(3,172	)		(2,539	)
Total comprehensive (loss) income	$	(3,059	)	$	289,984		$	74,174

See accompanying notes.

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DYNAVAX TECHNOLOGIES CORPORATION

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(In thousands)

	Common Stock				Preferred Stock
	Shares		Par Amount		Shares			Par Amount		Additional Paid-In Capital			Accumulated Other Comprehensive (Loss) Income			Accumulated Deficit			Total Stockholders' Equity
Balances at December 31, 2020		110,190	$	110		4		$	-	$	1,352,374		$	273		$	(1,294,064	)	$	58,693
Conversion of preferred stock		4,140		4		(4	)		-		(4	)		-			-			-
Issuance of common stock upon exercise of stock options		1,035		2		-			-		6,682			-			-			6,684
Issuance of common stock upon release of restricted stock awards		525		-		-			-		(107	)		-			-			(107	)
Issuance of common stock under Employee Stock Purchase Plan		217		-		-			-		841			-			-			841
Issuance of common stock upon exercise of warrants		3,959		4		-			-		59,884			-			-			59,888
Issuance of common stock, net of issuance costs, in conjunction    with an At Market Sales Agreement (Note 14)		2,879		3		-			-		28,153			-			-			28,156
Issuance of capped call options (Note 10)		-		-		-			-		(27,240	)		-			-			(27,240	)
Stock compensation expense		-		-		-			-		21,285			-			-			21,285
Total other comprehensive loss		-		-		-			-		-			(2,539	)		-			(2,539	)
Net income		-		-		-			-		-			-			76,713			76,713
Balances at December 31, 2021		122,945	$	123		-		$	-	$	1,441,868		$	(2,266	)	$	(1,217,351	)	$	222,374
Issuance of common stock upon exercise of stock options		1,194		2		-			-		9,638			-			-			9,640
Issuance of common stock upon release of restricted stock awards		1,432		1		-			-		(1	)		-			-			-
Issuance of common stock under Employee Stock Purchase Plan		154		-		-			-		1,430			-			-			1,430
Issuance of common stock upon exercise of warrants		1,879		2		-			-		24,668			-			-			24,670
Stock compensation expense		-		-		-			-		32,915			-			-			32,915
Total other comprehensive loss		-		-		-			-		-			(3,172	)		-			(3,172	)
Net income		-		-		-			-		-			-			293,156			293,156
Balances at December 31, 2022		127,604	$	128		-		$	-	$	1,510,518		$	(5,438	)	$	(924,195	)	$	581,013
Issuance of common stock upon exercise of stock options		850		1		-			-		6,360			-			-			6,361
Issuance of common stock upon release of restricted stock awards, net of statutory tax withholdings		915		1		-			-		(6,371	)		-			-			(6,370	)
Issuance of common stock under Employee Stock Purchase Plan		161		-		-			-		1,535			-			-			1,535
Stock compensation expense		-		-		-			-		42,592			-			-			42,592
Total other comprehensive income		-		-		-			-		-			3,330			-			3,330
Net loss		-		-		-			-		-			-			(6,389	)		(6,389	)
Balances at December 31, 2023		129,530	$	130		-		$	-	$	1,554,634		$	(2,108	)	$	(930,584	)	$	622,072

See accompanying notes.

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DYNAVAX TECHNOLOGIES CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

	Year Ended December 31,
	2023			2022			2021
Operating activities
Net (loss) income	$	(6,389	)	$	293,156		$	76,713
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization		4,342			3,812			4,296
Amortization of right-of-use assets		2,934			2,856			2,762
Inventory write-off		-			34,288			2,588
Amortization of premiums (accretion of discounts) on marketable securities		(16,555	)		(4,181	)		470
Loss on debt extinguishment		-			-			5,232
Change in fair value of warrant liability		-			(1,801	)		49,354
Stock-based compensation expense		42,592			32,915			21,285
Non-cash interest expense		1,120			1,088			1,608
Gain on sale of assets		(1,000	)		(1,000	)		(1,000	)
Bad debt expense (Note 9)		12,313			-			-
Changes in operating assets and liabilities:
Accounts and other receivables, net		43,268			(15,699	)		(109,155	)
Inventories		3,909			(32,399	)		(234	)
Prepaid manufacturing		-			159,655			(130,232	)
Prepaid expenses and other current assets		(4,673	)		(11,865	)		(64,558	)
Other assets		570			87			175
Accounts payable		1,952			691			(767	)
CEPI accrual (Note 9)		-			(21,110	)		128,848
Lease liabilities		(3,629	)		(3,125	)		(3,234	)
Deferred revenue		-			(349,864	)		311,652
Accrued and other liabilities		19,809			(24,788	)		39,725
Net cash provided by operating activities		100,563			62,716			335,528
Investing activities
Purchases of marketable securities		(636,921	)		(632,306	)		(164,928	)
Proceeds from maturities and redemptions of marketable securities		486,097			322,450			187,630
Purchases of property and equipment, net		(4,104	)		(7,139	)		(9,477	)
Proceeds from sale of assets, net of transaction costs		1,000			1,000			1,000
Net cash (used in) provided by investing activities		(153,928	)		(315,995	)		14,225
Financing activities
Proceeds from issuances of common stock, net		-			-			28,156
Proceeds from issuance of Convertible Notes, net		-			-			219,822
Purchases of capped call options		-			-			(27,240	)
Repayment of long-term debt		-			-			(190,194	)
Proceeds from warrants exercises		-			8,455			17,814
Proceeds from exercise of stock options and/or release of restricted stock awards, net		6,360			9,639			6,577
Proceeds from Employee Stock Purchase Plan		1,535			1,431			841
Payments for taxes related to net share settlement of RSUs		(6,509	)		-			-
Net cash provided by financing activities		1,386			19,525			55,776
Effect of exchange rate changes on cash and cash equivalents, and restricted cash		324			(443	)		(1,431	)
Net (decrease) increase in cash and cash equivalents, and restricted cash		(51,655	)		(234,197	)		404,098
Cash and cash equivalents, and restricted cash at beginning of year		202,211			436,408			32,310
Cash and cash equivalents, and restricted cash at end of year	$	150,556		$	202,211		$	436,408
Supplemental disclosure of cash flow information
Cash paid during the year for income taxes	$	2,014		$	2,208		$	1,312
Cash paid during the year for interest	$	5,638		$	5,638		$	9,815
Reclassification of contract asset from other current assets to other assets	$	71,307		$	-		$	-
Reclassification of CEPI accrual to CEPI accrual long-term	$	(60,337	)	$	-		$	-
Advance Payments forgiven per CEPI-Bio E Assignment Agreement (Note 9)	$	(47,401	)	$	-		$	-
Non-cash investing and financing activities:
Purchases of property and equipment, not yet paid	$	299		$	1,015		$	591
Right-of-use assets obtained in exchange for operating lease liabilities	$	1,332		$	2,848		$	2,468

See accompanying notes.

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DYNAVAX TECHNOLOGIES CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.Organization

Dynavax Technologies Corporation (“we,” “our,” “us,” “Dynavax” or the “Company”) is a commercial stage biopharmaceutical company developing and commercializing innovative vaccines to help protect the world against infectious diseases. Our first marketed product, HEPLISAV-B® [Hepatitis B Vaccine (Recombinant), Adjuvanted] is approved in the United States, the European Union and Great Britain for the prevention of infection caused by all known subtypes of hepatitis B virus in adults aged 18 years and older. In May 2022, we commenced commercial shipments of HEPLISAV-B in Germany.

We are advancing a pipeline of differentiated product candidates that leverage our CpG 1018® adjuvant, the adjuvant used in HEPLISAV-B, to develop improved vaccines in indications with unmet medical needs. These programs include vaccine candidates under development for shingles and Tdap, and a plague vaccine candidate program in collaboration with and fully funded by the U.S. Department of Defense ("DoD").

Additionally. we manufacture and have supplied in the past CpG 1018 adjuvant, the adjuvant used in HEPLISAV-B, through both commercial supply agreements, and through preclinical and clinical research collaborations with third-party organizations. As of December 31, 2022, we had satisfied all delivery obligations under our commercial supply agreements.

2.Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include our accounts and those of our wholly-owned subsidiaries, Dynavax GmbH located in Düsseldorf, Germany, Dynavax India LLP in India and a branch of Dynavax in Italy. All intercompany accounts and transactions among the entities have been eliminated from the consolidated financial statements.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make informed estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Management’s estimates are based on historical information available as of the date of the consolidated financial statements and various other assumptions we believe are reasonable under the circumstances. Actual results may differ materially from these estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known.

Foreign Currency Translation

We consider the local currency to be the functional currency for our international subsidiaries, Dynavax GmbH, located in Düsseldorf, Germany, Dynavax India LLP, and a branch of Dynavax registered in Italy. Accordingly, assets and liabilities denominated in this foreign currency are translated into U.S. dollars using the exchange rate in effect on the balance sheet date. Revenues and expenses are translated at average exchange rates prevailing during the year. Currency translation adjustments arising from period to period are charged or credited to accumulated other comprehensive income (loss) in stockholders’ equity.

As of December 31, 2023 and 2022, the cumulative translation adjustments balance was $(3.0) million and $(4.0) million, respectively, primarily related to the translation of Dynavax GmbH assets, liabilities and operating results from Euros to U.S. dollars. For the years ended December 31, 2023, 2022 and 2021, we reported an unrealized foreign currency translation gain (loss) of $1.1 million, $(1.8) million and $(2.5) million, respectively. Realized gains and losses resulting from currency transactions are included in other (expense) income in the consolidated statements of operations. For the years ended December 31, 2023, 2022 and 2021, we reported a (loss) gain of $(0.1) million, $0.1 million and $0.9 million, respectively, resulting from currency transactions in our consolidated statements of operations.

Segment Information

Operating segments are defined as components of an entity for which discrete financial information is available that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual

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segment and in assessing performance. Our Chief Executive Officer is the CODM. The CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, management has determined that we operate in one operating segment that is focused on the discovery, development, and commercialization of innovative vaccines. Net assets outside of the U.S. were less than 10% of total net assets as of December 31, 2023 and 2022.

Cash and Cash Equivalents and Marketable Securities

We consider all liquid investments purchased with an original maturity of three months or less and that can be liquidated without prior notice or penalty to be cash equivalents. Management determines the appropriate classification of marketable securities at the time of purchase. In accordance with our investment policy, we invest in short-term money market funds, U.S. treasuries, U.S. government agency securities and corporate debt securities. We believe these types of investments are subject to minimal credit and market risk.

We have classified our entire investment portfolio as available-for-sale and available for use in current operations and accordingly have classified all investments as short-term. Available-for-sale securities are carried at fair value based on inputs that are observable, either directly or indirectly, such as quoted market prices for similar securities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the securities, with unrealized gains and losses included in accumulated other comprehensive loss in stockholders’ equity. Commencing with our adoption of (“ASC”) 326, Financial Instruments — Credit Losses (“ASC 326") on January 1, 2023, we determine whether a decline in the fair value of our available-for-sale ("AFS") debt securities below their amortized cost basis (i.e., an impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in other comprehensive income (loss), net of applicable taxes. Credit-related impairments (if any) are recognized as an allowance on the balance sheet with a corresponding adjustment to earnings. Both the allowance and the adjustment to net income can be reversed if conditions change. To date, there have been no declines in fair value that have been identified as a credit-related impairment.

Concentration of Credit Risk and Other Risks and Uncertainties

Financial instruments that are subject to concentration of credit risk consist primarily of cash equivalents, marketable securities and accounts receivable.

Our policy is to invest cash in institutional money market funds and marketable securities of the U.S. government and corporate issuers with high credit quality to limit the amount of credit exposure. We currently maintain a portfolio of cash equivalents and marketable securities in a variety of securities, including short-term money market funds, U.S. treasuries, U.S. government agency securities and corporate debt securities. We have not experienced any significant losses on our cash equivalents and marketable securities.

Our accounts receivable balance consists, primarily, of amounts due from product sales. Accounts receivable are recorded net of reserves for chargebacks, distribution fees, trade discounts and doubtful accounts. We estimate our allowance for doubtful accounts based on an evaluation of the aging of our receivables. Accounts receivable balances are written off against the allowance when it is probable that the receivable will not be collected. During the year ended December 31, 2023, we recorded an allowance for doubtful accounts of $12.3 million, which was determined by assessing changes in Biological E. Limited's (“Bio E”) credit risk, contemplation of ongoing negotiations relating to Bio E Amendment No. 3 (See Note 9), and Bio E's dependence on cash collections from the Government of India, which have been delayed and significantly reduced in connection with the overall reduction in demand for CORBEVAX from the Government of India. As of December 31, 2023 and 2022, three customers collectively represented approximately 81% and 78% of our HEPLISAV-B trade receivable balance, respectively. As of December 31, 2023, we had no CpG 1018 adjuvant trade receivable balance. As of December 31, 2022, one customer represented approximately 100% of our CpG 1018 adjuvant trade receivable balance.

Our product candidates will require approval from the United States Food and Drug Administration ("FDA") and foreign regulatory agencies before commercial sales can commence. There can be no assurance that our product candidates will receive any of these required approvals. The denial or delay of such approvals may have a material adverse impact on our business and may impact our business in the future. In addition, after the approval of HEPLISAV-B by the FDA, there is still an ongoing risk of adverse events that did not appear during the drug approval process that could affect our authorizations in the future.

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We are subject to risks common to companies in the biopharmaceutical industry, including, but not limited to, new technological innovations, clinical development risk, establishment of appropriate commercial partnerships, protection of proprietary technology, compliance with government and environmental regulations, uncertainty of market acceptance of product candidates, product liability, the volatility of our stock price and the need to obtain additional financing.

Our long-lived assets located in the United States as of December 31, 2023 and 2022, represented 31% and 34% of our total assets, respectively, and the remaining long-lived assets were located in Germany.

Inventories

HEPLISAV-B Inventories

Inventory is stated at the lower of cost or estimated net realizable value, on a first-in, first-out, or FIFO, basis. We primarily use actual costs to determine our cost basis for inventories. Our assessment of market value requires the use of estimates regarding the net realizable value of our inventory balances, including an assessment of excess or obsolete inventory. We determine excess or obsolete inventory based on multiple factors, including an estimate of the future demand for our products, product expiration dates and current sales levels. Our assumptions of future demand for our products are inherently uncertain and if we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of inventory reserves that we report in a particular period. For the years ended December 31, 2023 and 2022, there were no inventory reserves or write-offs recognized.

We consider regulatory approval of product candidates to be uncertain and product manufactured prior to the required regulatory approval may not be sold unless regulatory approval is obtained. As such, the manufacturing costs for product candidates incurred prior to regulatory approval are not capitalized as inventory. Instead, those are expensed as research and development costs. We begin capitalization of these inventory related costs once regulatory approval is obtained.

CpG 1018 Adjuvant Inventories

Inventory is stated at the lower of cost or estimated net realizable value, on a first-in, first-out, or FIFO, basis. We primarily use actual costs to determine our cost basis for inventories. Our assessment of market value requires the use of estimates regarding the net realizable value of our inventory balances, including an assessment of excess or obsolete inventory. We determine excess or obsolete inventory based on multiple factors, including an estimate of the future demand for our products, product expiration dates and current sales levels. Our assumptions of future demand for our products are inherently uncertain and if we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of inventory reserves that we report in a particular period. For the year ended December 31, 2023, there was no remaining CpG 1018 adjuvant inventory balance. For the year ended December 31, 2022, we recorded $34.3 million of inventory write-off to cost of sales - product, in connection with cancelled orders and the reduction in demand for CpG 1018 adjuvant reflected in the Clover Supply Agreement, as amended (See Note 9).

Long-Lived Assets

Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets. Additions, major renewals and improvements are capitalized, while repair and maintenance costs are charged to expense as incurred. Leasehold improvements are amortized over the remaining life of the initial lease term or the estimated useful lives of the assets, whichever is shorter.

We evaluate the carrying value of long-lived assets, whenever events or changes in business circumstances or our planned use of long-lived assets indicate, based on undiscounted future operating cash flows, that their carrying amounts may not be fully recoverable or that their useful lives are no longer appropriate. When an indicator of impairment exists, undiscounted future operating cash flows of long-lived assets are compared to their respective carrying value. If the carrying value is greater than the undiscounted future operating cash flows of long-lived assets, the long-lived assets are written down to their respective fair values and an impairment loss is recorded. Fair value is determined primarily using the discounted cash flows expected to be generated from the use of assets. Significant management judgment is required in the forecast of future operating results that are used in the preparation of expected cash flows. There have been no material adjustments to these estimates during the years presented.

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Leases

We determine if an arrangement is or contains a lease at inception by assessing whether the arrangement contains an identified asset, and whether we have the right to control the identified asset. Operating leases are included in operating lease right-of-use (“ROU”) assets, other current liabilities and long-term portion of lease liabilities in our consolidated balance sheets. ROU assets represent our right to use an underlying asset for the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. The classification of our leases as operating or finance leases along with the initial measurement and recognition of the associated ROU assets and lease liabilities is performed at the lease commencement date. The measurement of ROU assets and lease liabilities is based on the present value of future lease payments over the lease term. The ROU asset also includes the effect of any lease payments made prior to or on lease commencement and excludes lease incentives and initial direct costs incurred, as applicable.

As the implicit rate in our leases is generally unknown, we use our incremental borrowing rate based on information available at the lease commencement date in determining the present value of future lease payments. We consider our credit risk, term of the lease, total lease payments and adjust for the impacts of collateral, as necessary, when calculating our incremental borrowing rate. The lease terms may include options to extend or terminate the lease when it is reasonably certain we will exercise any such options. Rent expense for our operating leases is recognized on a straight-line basis over the lease term. Variable lease payments are recorded as an expense in the period incurred.

We have elected not to apply the recognition requirements of Accounting Standards Codification ASC 842, Leases ("ASC 842"), for short-term leases. We have also elected the practical expedient to not separate lease components from non-lease components.

As lessors, we determine if an arrangement includes a lease at inception. We elected the practical expedient to not separate lease components from non-lease components. Sublease income is recognized on a straight-line basis over the expected lease term and is included in other income (expense) in our consolidated statements of operations.

Goodwill

Goodwill represents the excess purchase price over the fair value of tangible and intangible assets acquired and liabilities assumed. Our goodwill balance relates to our acquisition of Dynavax GmbH in 2006. Goodwill is not amortized, but instead is reviewed for impairment test at least annually, or more frequently if events occur or circumstances change that would indicate the carrying amount may be impaired. Goodwill is assigned to, and impairment testing is performed at, the reporting unit level. We determined that we have only one operating segment and there are no components of that operating segment that are deemed to be separate reporting units, such that we have one reporting unit for purposes of our goodwill impairment testing. No impairment has been identified for the years presented.

Convertible Notes

We account for our 2.50% convertible senior notes due in 2026 (“Convertible Notes”), as a long-term liability equal to the proceeds received from issuance, including the embedded conversion feature, net of the unamortized debt issuance and offering costs on the consolidated balance sheets (See Note 10). We evaluate all conversion, repurchase and redemption features contained in a debt instrument to determine if there are any embedded features that require bifurcation as a derivative. The conversion feature is not required to be accounted for separately as an embedded derivative. We amortize debt issuance and offering costs over the contractual term of the Convertible Notes, using the effective interest method, as interest expense on the consolidated statements of operations.

Capped Calls

We evaluate financial instruments under ASC 815, Derivatives and Hedging ("ASC 815"). The capped calls purchased in connection with the Convertible Notes financing ("Capped Calls") cover the same number of shares of common stock that initially underlie the Convertible Notes (subject to anti-dilution and certain other adjustments). The Capped Calls meet the definition of derivative under ASC 815. In addition, the Capped Calls meet the conditions in ASC 815 to be classified in stockholders’ equity and are not subsequently remeasured as long as the conditions for the equity classification continue to be met.

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Revenue Recognition

We recognize revenue when the customer obtains control of promised goods or services, in an amount that reflects the consideration, which we expect to receive in exchange for those goods or services. To determine revenue recognition for arrangements that we determine are within the scope of ASC 606, Revenue from Contracts with Customers ("ASC 606"), we apply the following five step model:

•identify the contract(s) with a customer;

•identify the performance obligation(s) in the contract;

•determine the transaction price;

•allocate the transaction price to the performance obligation(s) in the contract; and

•recognize revenue when (or as) we satisfy a performance obligation.

Product Revenue, Net – HEPLISAV-B

We sell HEPLISAV-B to a limited number of wholesalers and specialty distributors in the U.S. (collectively, our “Customers”).

Revenues from product sales are recognized when we have satisfied our performance obligation, which is the transfer of control of our product upon delivery to the Customer. The timing between the recognition of revenue for product sales and the receipt of payment is not significant. Because our standard credit terms are short-term and we expect to receive payment in less than one-year, there is no significant financing component on the related receivables. Taxes collected from Customers relating to product sales and remitted to governmental authorities are excluded from revenues. Since our performance obligation is part of a contract that has an original expected duration of one year or less, we elect not to disclose the information about our remaining performance obligations.

Overall, product revenue, net - HEPLISAV-B, reflects our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of variable consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment.

Reserves for Variable Consideration

Revenues from product sales are recorded at the net sales price, which includes estimates of variable consideration such as product returns, chargebacks, discounts, rebates and other fees that are offered within contracts between us and our Customers, healthcare providers, pharmacies and others relating to our product sales. We estimate variable consideration using either the most likely amount method or the expected value method, depending on the type of variable consideration and what method better predicts the amount of consideration we expect to receive. We take into consideration relevant factors such as industry data, current contractual terms, available information about Customers’ inventory, resale and chargeback data and forecasted customer buying and payment patterns, in estimating each variable consideration. The variable consideration is recorded at the time product sales is recognized, resulting in a reduction in product revenue and a reduction in accounts receivable (if the Customer offsets the amount against its accounts receivable) or as an accrued liability (if we pay the amount through our accounts payable process). Variable consideration requires significant estimates, judgment and information obtained from external sources. The amount of variable consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment. If we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of revenue that we report in a particular period. We evaluate our estimates of variable considerations including, but not limited to, product returns, chargebacks and rebates, periodically or when there is an event or change in circumstances that may indicate that our estimates may change.

Product Returns: Consistent with industry practice, we offer our Customers a limited right of return based on the product’s expiration date for product that has been purchased from us. We estimate the amount of our product sales that may be returned by our Customers and record this estimate as a reduction of revenue in the period the related product revenue is recognized. We consider several factors in the estimation of potential product returns including expiration dates of the product shipped, the limited product return rights, available information about Customers’ inventory and other relevant factors.

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Chargebacks: Our Customers subsequently resell our product to healthcare providers, pharmacies and others. In addition to distribution agreements with Customers, we enter into arrangements with qualified healthcare providers that provide for chargebacks and discounts with respect to the purchase of our product. Chargebacks represent the estimated obligations resulting from contractual commitments to sell product to qualified healthcare providers at prices lower than the list prices charged to Customers who directly purchase the product from us. Customers charge us for the difference between what they pay for the product and the ultimate selling price to the qualified healthcare providers. These reserves are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue and accounts receivable. Chargeback amounts are determined at the time of resale to the qualified healthcare providers by Customers, and we issue credits for such amounts generally within a few weeks of the Customer’s notification to us of the resale. Reserves for chargebacks consists of credits that we expect to issue for units that remain in the distribution channel inventories at each reporting period end that we expect will be sold to the qualified healthcare providers, and chargebacks for units that our Customers have sold to the qualified healthcare providers, but for which credits have not been issued.

Trade Discounts and Allowances: We provide our Customers with discounts which include early payment incentives that are explicitly stated in our contracts, and are recorded as a reduction of revenue in the period the related product revenue is recognized.

Distribution Fees: Distribution fees include fees paid to certain Customers for sales order management, data and distribution services. Distribution fees are recorded as a reduction of revenue in the period the related product revenue is recognized.

Rebates: Under certain contracts, Customers may obtain rebates for purchasing minimum volumes of our product. We estimate these rebates based upon the expected purchases and the contractual rebate rate and record this estimate as a reduction in revenue in the period the related revenue is recognized.

Product Revenue, Net – CpG 1018 Adjuvant

We also sell our innovative adjuvant, CpG 1018 adjuvant, to our collaboration partners for use in their development and/or commercialization of COVID-19 vaccine. We have determined that our collaboration partners meet the definition of Customers under ASC 606. Therefore, we accounted for our CpG 1018 adjuvant sales under ASC 606. Revenues from product sales are recognized when we have satisfied our performance obligation, which is the transfer of control of our product to the customer. Because the timing between the recognition of revenue for product sales and the receipt of payment is less than one year, there is no significant financing component on the related receivables. Since our performance obligation is part of a contract that has an original expected duration of one year or less, we elect not to disclose the information about our remaining performance obligations.

Overall, product revenue, net - CpG 1018 adjuvant, reflects our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment. Our CpG 1018 adjuvant customers have purchased a significant quantity of CpG 1018 adjuvant as part of their initial COVID-19 vaccine development inventory. Accordingly, we did not recognize CpG 1018 adjuvant net product revenue during the year ended December 31, 2023.

Other Revenue

Other revenue includes revenue from our agreement with the DoD, collaboration and manufacturing service revenue. We have entered into grant agreements, collaborative arrangements and arrangements to provide manufacturing services to other companies. Such arrangements may include promises to customers which, if capable of being distinct, are accounted for as separate performance obligations. For agreements with multiple performance obligations, we allocate estimated revenue to each performance obligation at contract inception based on the estimated transaction price of each performance obligation. Revenue allocated to each performance obligation is then recognized when we satisfy the performance obligation by transferring control of the promised good or service to the customer.

Research and Development Expenses and Accruals

Research and development expenses include personnel and facility-related expenses, outside contracted services including clinical trial costs, manufacturing and process development costs, research costs and other consulting services and

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non-cash stock-based compensation. Research and development costs are expensed as incurred. Amounts due under contracts with third parties may be either fixed fee or fee for service, and may include upfront payments, monthly payments and payments upon the completion of milestones or receipt of deliverables. Non-refundable advance payments under agreements are capitalized and expensed as the related goods are delivered or services are performed.

We contract with third parties to perform various clinical trial activities in the on-going development of potential products. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows to our vendors. Payments under the contracts depend on factors such as the achievement of certain events, successful enrollment of patients, and completion of portions of the clinical trial or similar conditions. Our accrual for clinical trials is based on estimates of the services received and efforts expended pursuant to contracts with clinical trial centers and clinical research organizations. We may terminate these contracts upon written notice and we are generally only liable for actual effort expended by the organizations to the date of termination, although in certain instances we may be further responsible for termination fees and penalties. We estimate research and development expenses and the related accrual as of each balance sheet date based on the facts and circumstances known to us at that time. There have been no material adjustments to the prior period accrued estimates for clinical trial activities during the years presented.

Stock-Based Compensation

Stock-based compensation expense for restricted stock units ("RSUs"), market-based performance stock units ("PSUs") and stock options is estimated at the grant date based on the award’s estimated fair value.

For awards that vest based on service conditions and market conditions, we use a straight-line method to recognize compensation expense over the award’s requisite service period, assuming estimated forfeiture rates. For awards that contain performance conditions, we determine the appropriate amount to expense at each reporting date based on the anticipated achievement of performance targets, which requires judgement, including forecasting the achievement of future specified targets. At the date performance conditions are determined to be probable of achievement, we record a cumulative expense catch-up, with remaining expense amortized over the remaining service period. Throughout the performance period, we re-assesses the estimated performance and updates the number of performance-based awards that we believe will ultimately vest.

Fair value of RSUs is determined at the date of grant using our closing stock price, with the exception of PSUs, which are measured using the Monte Carlo simulation method on the date of grant. Our determination of the fair value of stock options on the date of grant using an option-pricing model is affected by our stock price, as well as assumptions regarding a number of subjective variables. We selected the Black-Scholes option pricing model as the most appropriate method for determining the estimated fair value-based measurement of our stock options. The Black-Scholes model requires the use of subjective assumptions, which determine the fair value-based measurement of stock options. These assumptions include, but are not limited to, our expected stock price volatility over the term of the awards, and projected employee stock option exercise behaviors. In the future, as additional empirical evidence regarding these input estimates becomes available, we may change or refine our approach of deriving these input estimates. These changes could impact our fair value of stock options granted in the future. Changes in the fair value of stock awards could materially impact our operating results.

Our current estimate of volatility is based on the historical volatility of our stock price. To the extent volatility in our stock price increases in the future, our estimates of the fair value of options granted in the future could increase, thereby increasing stock-based compensation expense recognized in future periods. We derive the expected term assumption primarily based on our historical settlement experience, while considering options that have not yet completed a full life cycle. Stock-based compensation expense is recognized only for awards ultimately expected to vest. Our estimate of the forfeiture rate is based primarily on our historical experience. To the extent we revise this estimate in the future, our share-based compensation expense could be materially impacted in the period of revision. There have been no material adjustments to these estimates during the years presented.

Income Taxes

The asset and liability approach is used to recognize deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities. Tax law and rate changes are reflected in income in the period such changes are enacted. We include interest and penalties related to income taxes, including unrecognized tax benefits, within income tax expense.

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Our income tax returns are based on calculations and assumptions that are subject to examination by the Internal Revenue Service and other tax authorities. In addition, the calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax regulations. We recognize liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. While we believe we have appropriate support for the positions taken on our tax returns, we regularly assess the potential outcomes of examinations by tax authorities in determining the adequacy of our provision for income taxes. We continually assess the likelihood and amount of potential adjustments and adjust the income tax provision, income taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known.

Judgment is required in determining our provision for income taxes, our deferred tax assets and liabilities and the valuation allowance recorded against our net deferred tax assets. Deferred tax assets and liabilities are determined using the enacted tax rates in effect for the years in which those tax assets are expected to be realized. A valuation allowance is established when it is more likely than not the future realization of all or some of the deferred tax assets will not be achieved. The evaluation of the need for a valuation allowance is performed on a jurisdiction-by-jurisdiction basis and includes a review of all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations.

Based on all available evidence, both positive and negative, and the weight of that evidence to the extent such evidence can be objectively verified, we believe that recognition of the deferred tax assets arising from future tax benefits is currently not more likely than not to be realized and, accordingly, we have determined a need for a full valuation allowance.
 

Recent Accounting Pronouncements

Accounting Standards Update 2016-13

In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments, which was codified in Accounting Standards Codification ASC 326, Financial Instruments — Credit Losses. The standard changes the methodology for measuring credit losses on financial instruments and the timing of when such losses are recorded. Because we were a smaller reporting company based on the most recent determination as of November 15, 2019, ASC 326 became effective for us for fiscal years beginning after December 15, 2022. As such, we adopted ASC 326 effective January 1, 2023, utilizing the modified retrospective transition method. Upon adoption, we updated our impairment model to utilize a forward-looking current expected credit losses (“CECL”) model in place of the incurred loss methodology for financial instruments measured at amortized cost, primarily including our accounts receivable and contract asset. In relation to AFS debt securities, the guidance eliminates the concept of “other-than-temporary” impairment, and instead focuses on determining whether any impairment is a result of a credit loss or other factors. The adoption of ASC 326 did not have a material impact on our consolidated financial statements as of the adoption date.

In November 2023, FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires public entities to disclose information about their reportable segments’ significant expenses and other segment items on an interim and annual basis. Public entities with a single reportable segment are required to apply the disclosure requirements in ASU 2023-07, as well as all existing segment disclosures and reconciliation requirements in ASC 280 on an interim and annual basis. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. We are currently evaluating the impact of adopting ASU 2023-07.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires public entities, on an annual basis, to provide disclosure of specific categories in the rate reconciliation, as well as disclosure of income taxes paid disaggregated by jurisdiction. ASU 2023-09 is effective for fiscal

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years beginning after December 15, 2024, with early adoption permitted. We are currently evaluating the impact of adopting ASU 2023-09.

3.Fair Value Measurements

We measure fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The accounting standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value which are the following:

•Level 1—Observable inputs, such as quoted prices in active markets for identical assets or liabilities;

•Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

•Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities; therefore, requiring an entity to develop its own valuation techniques and assumptions.

Assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurements. We review the fair value hierarchy classification on a quarterly basis. Changes in the ability to observe valuation inputs may result in a reclassification of levels for certain assets or liabilities within the fair value hierarchy. There were no transfers between Level 1, 2 and 3 during the years ended December 31, 2023 and 2022.

The carrying amounts of cash equivalents, accounts and other receivables, accounts payable and accrued liabilities are considered reasonable estimates of their respective fair value because of their short-term nature.

Recurring Fair Value Measurements

The following table represents the fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis (in thousands):

	Level 1		Level 2		Level 3		Total
December 31, 2023
Assets
Money market funds	$	131,635	$	-	$	-	$	131,635
U.S. treasuries		-		74,237		-		74,237
U.S. government agency securities		-		216,688		-		216,688
Corporate debt securities		-		308,552		-		308,552
Total assets	$	131,635	$	599,477	$	-	$	731,112
	Level 1		Level 2		Level 3		Total
December 31, 2022
Assets
Money market funds	$	172,418	$	-	$	-	$	172,418
U.S. treasuries		-		42,308		-		42,308
U.S. government agency securities		-		88,032		-		88,032
Corporate debt securities		-		292,051		-		292,051
Total assets	$	172,418	$	422,391	$	-	$	594,809

Money market funds are highly liquid investments and are actively traded. The pricing information on these investment instruments is readily available and can be independently validated as of the measurement date. This approach results in the classification of these securities as Level 1 of the fair value hierarchy.

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U.S. treasuries, U.S. government agency securities and corporate debt securities are measured at fair value using Level 2 inputs. We review trading activity and pricing for these investments as of each measurement date. When sufficient quoted pricing for identical securities is not available, we use market pricing and other observable market inputs for similar securities obtained from various third-party data providers. These inputs represent quoted prices for similar assets in active markets or these inputs have been derived from observable market data. This approach results in the classification of these securities as Level 2 of the fair value hierarchy.

Warrants were issued in connection with the underwritten public offering in August 2019 and are accounted for as a derivative liability at fair value (See Note 14). The fair value of the warrant liability was estimated using the Black-Scholes model, which requires assumptions such as expected term, expected volatility and risk-free interest rate. These assumptions are subjective and require judgment to develop. Expected term is estimated using the full remaining contractual term of the warrants. We determine expected volatility based on our historical common stock price volatility. The warrant liability was classified as a Level 3 instrument as its value was based on unobservable inputs that are supported by little or no market activity. As of December 31, 2022, all 1,882,600 of the outstanding warrants as of December 31, 2021 have been exercised or expired.

The following table provides a summary of changes in the fair value warrant liability for year ended December 31, 2022 (in thousands):

Balance at December 31, 2021	$	18,016
Decrease in fair value of warrants exercised		(1,801	)
Warrants exercised or expired		(16,215	)
Balance at December 31, 2022	$	-

4.Cash and Cash Equivalents, Restricted Cash and Marketable Securities

The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows (in thousands):

	December 31,
	2023		2022		2021
Cash and cash equivalents	$	150,279	$	202,004	$	436,189
Restricted cash (1)		277		207		219
Total cash and cash equivalents, and restricted cash shown in the    consolidated statements of cash flows	$	150,556	$	202,211	$	436,408

(1) Restricted cash is included in "Other assets" in the Consolidated Balance Sheets.

Restricted cash balances relate to certificates of deposit issued as collateral to certain letters of credit issued as security to our lease arrangements (See Note 8).

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Cash and cash equivalents, and marketable securities consist of the following (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
December 31, 2023
Cash and cash equivalents:
Cash	$	11,190	$	-	$	-		$	11,190
Money market funds		131,635		-		-			131,635
Corporate debt securities		7,453		1		-			7,454
Total cash and cash equivalents		150,278		1		-			150,279
Marketable securities available-for-sale:
U.S. treasuries		74,109		172		(44	)		74,237
U.S. government agency securities		216,265		692		(269	)		216,688
Corporate debt securities		300,803		315		(20	)		301,098
Total marketable securities available-for-sale		591,177		1,179		(333	)		592,023
Total cash and cash equivalents, and marketable securities	$	741,455	$	1,180	$	(333	)	$	742,302
December 31, 2022
Cash and cash equivalents:
Cash	$	29,586	$	-	$	-		$	29,586
Money market funds		172,418		-		-			172,418
Total cash and cash equivalents		202,004		-		-			202,004
Marketable securities available-for-sale:
U.S. treasuries		42,502		-		(194	)		42,308
U.S. government agency securities		88,429		-		(397	)		88,032
Corporate debt securities		292,865		12		(826	)		292,051
Total marketable securities available-for-sale		423,796		12		(1,417	)		422,391
Total cash and cash equivalents, and marketable securities	$	625,800	$	12	$	(1,417	)	$	624,395

The maturities of our marketable securities available-for-sale are as follows (in thousands):

.	December 31, 2023
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	440,131	$	440,104
Mature after one year through two years		151,046		151,919
	$	591,177	$	592,023

We have classified our entire investment portfolio as available-for-sale and available for use in current operations and accordingly have classified all investments as short-term. Available-for-sale securities are carried at fair value based on inputs that are observable, either directly or indirectly, such as quoted market prices for similar securities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the securities. Unrealized losses are included in accumulated other comprehensive loss in stockholders’ equity. Commencing with our adoption of ASC 326 on January 1, 2023, we determine whether a decline in the fair value of our AFS debt securities below their amortized cost basis (i.e., an impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in other comprehensive income (loss), net of applicable taxes. Credit-related impairments (if any) are recognized as an allowance on the balance sheet with a corresponding adjustment to earnings. Both the allowance and the adjustment to net income can be reversed if conditions change.

There were no realized gains or losses from the sale of marketable securities for the years ended December 31, 2023 and 2022. We do not intend to sell, and are not required to sell, the investments that are in an unrealized loss position before recovery of their amortized cost basis. For the year ended December 31, 2023, we did not record an allowance for credit losses, as management believes any such losses would be immaterial based on the investment-grade credit rating for each of the investments as of December 31, 2023. As such, there have been no declines in fair value that have been identified as a credit-related impairment.

5.Inventories

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The following table presents inventories (in thousands):

	December 31,
	2023		2022
Raw materials	$	27,256	$	25,517
Work-in-process		18,954		23,934
Finished goods		7,080		9,995
Total	$	53,290	$	59,446

6.Property and Equipment, net

Property and equipment consist of the following (in thousands):

	Estimated Useful	December 31,
	Life (In years)	2023			2022
Manufacturing equipment	5-13	$	15,752		$	15,139
Lab equipment	5-13		2,827			2,360
Computer equipment	3		5,060			4,720
Furniture and fixtures	3-13		2,467			2,464
Leasehold improvements	2-12		37,201			28,822
Assets in progress			5,822			11,613
			69,129			65,118
Less accumulated depreciation and amortization			(31,832	)		(27,522	)
Total		$	37,297		$	37,596

Depreciation and amortization expense on property and equipment was $4.3 million, $3.8 million and $4.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

7.Current Accrued Liabilities

Current accrued liabilities consist of the following (in thousands):

	December 31,
	2023		2022
Payroll and related expenses	$	17,069	$	14,261
Revenue reserve accruals		21,004		10,552
Accrued inventory		4,456		2,209
Other accrued liabilities		6,919		3,697
Total	$	49,448	$	30,719

8.Commitments and Contingencies

Leases

We lease our facilities in Emeryville, California and Düsseldorf, Germany. We lease and sublease certain manufacturing and office space with lease terms ranging from 3 to 12 years. These leases require monthly lease payments that may be subject to annual increases throughout the lease term. Certain of these leases also include options to renew or extend the lease for two successive five-year terms. These optional periods have not been considered in the determination of the right-of-use assets or lease liabilities associated with these leases as we did not consider the exercise of these options to be reasonably certain.

We also sublease one of our leased premises to a third party. Rent is subject to scheduled annual increases and the subtenant is responsible for certain operating expenses and taxes throughout the life of the sublease. The sublease term expires on March 31, 2031, unless earlier terminated, concurrent with the term of our lease. The subtenant has no option to

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extend the sublease term. Sublease income was $7.6 million, $7.7 million and $7.7 million for the years ended December 31, 2023, 2022 and 2021, respectively. Sublease income is included in other income (expense) in our consolidated statements of operations. Rent received from the subtenant in excess of rent paid to the landlord shall be shared by paying the landlord 50% of the excess rent. The excess rent is considered a variable lease payment and the total estimated payments are being recognized as additional rent expense on a straight-line basis.

Our lease expense comprises of the following (in thousands):

	Year Ended December 31,
	2023		2022		2021
Operating lease expense	$	5,563	$	6,222	$	6,265

Cash paid for amounts included in the measurement of lease liabilities for the years ended December 31, 2023, 2022, and 2021 was $7.2 million, $6.8 million, and $7.0 million, respectively and were included in change in lease liabilities in our consolidated statement of cash flows.

The balance sheet classification of our operating lease liabilities was as follows (in thousands):

	December 31,
	2023		2022
Operating lease liabilities:
Current portion of lease liabilities (included in other current liabilities)	$	4,496	$	3,631
Long-term portion of lease liabilities		29,720		32,801
Total operating lease liabilities	$	34,216	$	36,432

As of December 31, 2023, the maturities of our sublease income and operating lease liabilities were as follows (in thousands):

Years ending December 31,	Sublease Income		Operating Lease Liabilities
2024	$	5,684	$	7,605
2025		5,854		6,980
2026		6,030		6,122
2027		6,211		6,052
2028		6,397		6,215
Thereafter		15,103		15,062
Total	$	45,279		48,036
Less:
Present value adjustment				(13,820	)
Total			$	34,216

The weighted average remaining lease term and the weighted average discount rate used to determine the operating lease liabilities were as follows:

	December 31,
	2023			2022
Weighted average remaining lease term	6.7 years			7.6 years
Weighted average discount rate		10.1	%		10.1	%

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Commitments

As of December 31, 2023, our material non-cancelable purchase and other commitments for the supply of HEPLISAV-B totaled $43.4 million. The following summarizes our material purchase commitments at December 31, 2023 and the effect those obligations are expected to have on our liquidity and cash flows in future periods (in thousands):

Years ending December 31,	(in thousands)
2024	$	18,866
2025		11,983
2026		12,516
2027		-
2028		-
Thereafter		-
Total	$	43,365

On September 7, 2023 (the “Effective Date”), we entered into an agreement (the “Avecia Supply Agreement”) with Nitto Denko Avecia Inc. (“Avecia”) for the manufacture and supply of our CpG 1018 adjuvant using a specific production process. Under the Avecia Supply Agreement, Avecia has agreed to produce and supply to us quantities of CpG 1018 adjuvant ordered by us after the Effective Date. Subject to certain conditions in the Avecia Supply Agreement, we are obligated to purchase all of our annual volume requirements of CpG 1018 adjuvant from Avecia up to a specified production capacity. We may alternatively order CpG 1018 adjuvant produced using a different production process pursuant to the existing supply agreement between us and Avecia dated October 1, 2012 (the “2012 Agreement”). As of December 31, 2023, our aggregate minimum commitment for the supply of CpG 1018 adjuvant under the Avecia Supply Agreement was $7.4 million within the next 12 months. As of December 31, 2022, we had no non-cancelable purchase and other commitments for the supply of CpG 1018 adjuvant.

In addition to the non-cancelable commitments included above, we have entered into contractual arrangements that obligate us to make payments to the contractual counterparties upon the occurrence of future events. In addition, in the normal course of operations, we have entered into license and other agreements and intend to continue to seek additional rights relating to compounds or technologies in connection with our discovery, manufacturing and development programs. Under the terms of the agreements, we may be required to pay future up-front fees, milestones and royalties on net sales of products originating from the licensed technologies, if any, or other payments contingent upon the occurrence of future events that cannot reasonably be estimated.

We also rely on and have entered into agreements with research institutions, contract research organizations and clinical investigators as well as clinical material manufacturers. These agreements are terminable by us upon written notice. Generally, we are liable only for actual effort expended by the organizations at any point in time during the contract through the notice period.

As of December 31, 2023, the aggregate principal amount of our convertible senior notes ("Convertible Notes") was $225.5 million, excluding debt discount of $2.8 million (See Note 10).

During 2004, we established a letter of credit with Deutsche Bank as security for our Düsseldorf lease in the amount of €0.2 million (Euros). The letter of credit remained outstanding through December 30, 2023 and was collateralized by a certificate of deposit for €0.2 million, which has been included in restricted cash in the consolidated balance sheets as of December 31, 2023 and 2022.

In conjunction with our agreement with Symphony Dynamo, Inc. and Symphony Dynamo Holdings LLC (“Holdings”) in November 2009, we agreed to make contingent cash payments to Holdings equal to 50% of the first $50 million from any upfront, pre-commercialization milestone or similar payments received by us from any agreement with any third party with respect to the development and/or commercialization of cancer and hepatitis C therapies originally licensed to Symphony Dynamo, Inc., including our immune-oncology compound, SD-101. In July 2020, we sold assets related to SD-101 to Surefire Medical, Inc. d/b/a TriSalus Life Sciences (“TriSalus”). We paid $2.5 million to Holdings in August 2020. In each of September 2021, May 2022 and September 2023, we received $1.0 million from TriSalus because it met pre-commercialization milestones. We recorded the proceeds as gain on sale of assets in our consolidated statements of operations. We paid Holdings $0.5 million in each of September 2021, May 2022 and October 2023. We included the payments in selling, general and administrative expenses in our consolidated statements of operations.

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Contingencies

From time to time, we may be involved in claims, suits, and proceedings arising from the ordinary course of our business, including actions with respect to intellectual property claims, commercial claims, and other matters. Such claims, suits, and proceedings are inherently uncertain and their results cannot be predicted with certainty. Regardless of the outcome, such legal proceedings can have an adverse impact on us because of legal costs, diversion of management resources, and other factors. In addition, it is possible that a resolution of one or more such proceedings could result in substantial damages, fines, penalties or orders requiring a change in our business practices, which could in the future materially and adversely affect our financial position, results of operations, or cash flows in a particular period.

9.Collaborative Research, Development and License Agreements

Coalition for Epidemic Preparedness Innovations

In January 2021, we entered into an agreement (together with subsequent amendments, the “CEPI Agreement”) with Coalition for Epidemic Preparedness Innovations (“CEPI”) for the manufacture and reservation of a specified quantity of CpG 1018 adjuvant (“CpG 1018 Materials”). In May 2021, we entered into the first amendment to the CEPI Agreement. The CEPI Agreement enables CEPI to direct the supply of CpG 1018 Materials to CEPI partner(s). CEPI partner(s) would purchase CpG 1018 Materials under separately negotiated agreements. The CEPI Agreement also allows us to sell CpG 1018 Materials to third parties if not purchased by a CEPI partner within a two-year term.

In exchange for reserving CpG 1018 Materials and agreeing to sell CpG 1018 Materials to CEPI partner(s) at pre-negotiated prices, CEPI agreed to provide payments in the form of an interest-free, unsecured, forgivable loan (the “Advance Payments”). We are obligated to repay the Advance Payments, in proportion to quantity sold, if and to the extent we receive payments from sales of CpG 1018 Materials reserved under the CEPI Agreement. If the vaccine programs pursued by CEPI partner(s) are unsuccessful and no alternative use is found for CpG 1018 Materials reserved under the CEPI Agreement, the applicable Advance Payments will be forgiven at the end of the two-year term.

On April 27, 2023, we entered into a waiver and second amendment to the CEPI Agreement by and between us and CEPI (the “CEPI-Bio E Assignment Agreement”). Pursuant to the CEPI-Bio E Assignment Agreement, CEPI has forgiven the entirety of the outstanding Advance Payments for CpG 1018 Materials allocated to and ordered by Bio E under the CEPI Agreement and has assumed our previous rights to $47.4 million of Bio E accounts receivable.

Through December 31, 2023, we received Advance Payments totaling approximately $175.0 million pursuant to the CEPI Agreement, of which $67.3 million have been repaid and $47.4 million have been forgiven (as discussed above). As of December 31, 2023, remaining Advance Payments totaling $60.3 million in CEPI accrual long-term were reflected in our consolidated balance sheets, representing the outstanding balance of the Advance Payments relating to the Clover Supply Agreement (as defined and discussed below). As of December 31, 2022, we recorded Advance Payments of $107.7 million included in CEPI accrual. There were no deferred revenue balances related to the CEPI Agreement as of December 31, 2023 and December 31, 2022.

Zhejiang Clover Biopharmaceuticals, Inc. and Clover Biopharmaceuticals (Hong Kong) Co., Limited

In June 2021, we entered into an agreement with Zhejiang Clover Biopharmaceuticals, Inc. and Clover Biopharmaceuticals (Hong Kong) Co., Limited (collectively, “Clover”), for the commercial supply of CpG 1018 adjuvant, for use with Clover’s COVID-19 vaccine candidate, SCB-2019 (together with subsequent amendments, the “Clover Supply Agreement”). Under the Clover Supply Agreement, Clover committed to purchase specified quantities of CpG 1018 adjuvant, at pre-negotiated prices pursuant to the CEPI Agreement, for use in Clover’s commercialization of vaccines containing SCB-2019 and CpG 1018 adjuvant (“Clover Product”). The Clover Supply Agreement also provides terms for Clover to order additional quantities of CpG 1018 adjuvant beyond the quantities reserved by CEPI. In 2022 and 2023, we signed four amendments to the Clover Supply Agreement. The terms and conditions of the Clover Supply Agreement were operative through December 2022, and as of December 31, 2022, we had satisfied all delivery obligations thereunder.

For CpG 1018 adjuvant reserved for Clover under the CEPI Agreement, Clover is obligated to pay us the purchase price upon the earliest of (i) the true-up exercise, (ii) within a specified period after Clover delivers Clover Product to a customer, or (iii) Clover’s receipt of payment for Clover Product from a customer. When we transfer control of CpG 1018 adjuvant that is reserved under the CEPI Agreement, we recognize product revenue and a corresponding contract asset as our right to consideration is contingent on something other than the passage of time, as outlined above.

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The contract asset of $71.3 million relating to Clover was included in other current assets as of December 31, 2022. The contract asset was subsequently reclassified to other assets (long term) and remains classified in other assets (long term) as of December 31, 2023. The contract asset was reclassified to other assets (long term) to reflect the timing of expected long term demand for CpG 1018 adjuvant for Clover Product.

Corresponding Advance Payments of $60.3 million relating to Clover are recorded in CEPI accrual long-term in our consolidated balance sheets as of December 31, 2023. These Advance Payments may be repaid using cash collected from Clover or forgiven in accordance with the CEPI Agreement. We had no accounts receivable balance from Clover as of December 31, 2023 and December 31, 2022. We did not recognize CpG 1018 adjuvant net product revenue from Clover for the year ended December 31, 2023. We recognized CpG 1018 adjuvant net product revenue of $288.0 million for the year ended December 31, 2022.

Additionally, during the year ended December 31, 2022 and in connection with amendments to the Clover Supply Agreement, which reduced or cancelled certain orders for CpG 1018 adjuvant, we recorded an inventory write-off of $34.3 million of excess CpG 1018 adjuvant raw materials and finish goods inventory. This excess inventory write-off was reflected as a charge to cost of sales – product, in the consolidated statements of operations for the year ended December 31, 2022.

Biological E. Limited

In July 2021, we entered into an agreement (together with subsequent amendments, the “Bio E Supply Agreement”) with Biological E. Limited (“Bio E”), for the commercial supply of CpG 1018 adjuvant, for use with Bio E’s subunit COVID-19 vaccine candidate, CORBEVAX™. Under the Bio E Supply Agreement, Bio E committed to purchase specified quantities of CpG 1018 adjuvant, at pre-negotiated prices pursuant to the CEPI Agreement, for use in Bio E’s commercialization of its CORBEVAX vaccine (“Bio E Product”) with specified delivery dates in 2021 and the first quarter of 2022. The Bio E Supply Agreement also provides terms for Bio E to order additional quantities of CpG 1018 adjuvant beyond the quantities reserved by CEPI. In June 2022 and in October 2022, we entered into amendments to the Bio E Supply Agreement (the “Bio E Amendment No. 1” and the “Bio E Amendment No. 2,” together the “Bio E Amendments”). The Bio E Amendments primarily established: (i) a new payment schedule for certain outstanding invoices related to the CEPI product to be the earlier of December 31, 2022, or receipt of certain amounts from Bio E from the Government of India in connection with their advance purchase agreement for CORBEVAX, and (ii) further modified the scope of the Bio E Supply Agreement, by reducing certain quantities of CpG 1018 adjuvant to be delivered. The terms and conditions of the Bio E Supply Agreement were operative through December 2022, and as of December 31, 2022, we had satisfied all delivery obligations thereunder.

As of December 31, 2023, we had no accounts receivable balance from Bio E. During the first quarter of 2023, we recorded an allowance for doubtful accounts of $12.3 million, which was determined by assessing changes in Bio E’s credit risk, contemplation of ongoing negotiations relating to Bio E Amendment No. 3 (defined below), and Bio E's dependence on cash collections from the Government of India, which have been delayed and significantly reduced in connection with the overall reduction in demand for CORBEVAX from the Government of India.

On April 26, 2023, we entered into a third amendment to the Bio E Supply Agreement (the “Bio E Amendment No. 3”), and on April 27, 2023, we entered into the CEPI-Bio E Assignment Agreement. Pursuant to the CEPI-Bio E Assignment Agreement, CEPI has forgiven the entirety of remaining amounts outstanding relating to a liability for Advance Payments of $47.4 million (the “Bio E CEPI Advance Payments”) for CpG 1018 Materials allocated to Bio E, and has assumed our previous rights to collect $47.4 million of Bio E accounts receivable. Pursuant to the Bio E Amendment No. 3, we collected $14.5 million from Bio E (including $13.5 million in April 2023 and $1.0 million in August 2023). Accordingly, as of December 31, 2023, the CEPI-Bio E Assignment Agreement resulted in: (i) no accounts receivable balance, and (ii) the derecognition of $47.4 million CEPI accrual in connection with the Bio E CEPI Advance Payments. The Bio E Amendment No. 3 provides for additional future payment of either $5.5 million in the event that Bio E receives at least $125.0 million, or $12.3 million in the event that Bio E receives at least $250.0 million in future payments from the Government of India associated with its CORBEVAX product on or before August 15, 2025. These additional amounts are not considered collectible until the achievement of these future milestones.

We did not recognize CpG 1018 adjuvant net product revenue from Bio E for the year ended December 31, 2023. We recognized CpG 1018 adjuvant net product revenue of $206.2 million for the year ended December 31, 2022.

U.S. Department of Defense

In September 2021, we entered into an agreement with the DoD for the development of a recombinant plague vaccine adjuvanted with CpG 1018 adjuvant for approximately $22.0 million over two and a half years. Under the agreement, we are

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conducting a Phase 2 clinical trial combining our CpG 1018 adjuvant with the DoD's rF1V vaccine. In July 2023, we executed a contract modification with the DoD to support advancement into a nonhuman primate challenge study, with the agreement now totaling $33.7 million through 2025. For the years ended December 31, 2023 and 2022, we recognized revenue of $17.6 million and $8.8 million, respectively, which is included in other revenue in our consolidated statements of operations.

10.Convertible Notes

In May 2021, we issued $225.5 million of Convertible Notes in a private placement. Total proceeds from the issuance of the Convertible Notes, net of debt issuance and offering costs of $5.7 million, were $219.8 million. We used $190.2 million of the net proceeds to retire our previous loan agreement with CRG Servicing LLC and $27.2 million of the net proceeds to pay the costs of the Capped Calls described below.

The Convertible Notes are general, unsecured obligations and accrue interest at a rate of 2.50% per annum payable semiannually in arrears on May 15 and November 15 of each year, beginning on November 15, 2021. The Convertible Notes mature on May 15, 2026, unless converted, redeemed or repurchased prior to such date.

The Convertible Notes are convertible into cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, at an initial conversion rate of 95.5338 shares of our common stock per $1,000 principal amount of the Convertible Notes, which is equivalent to an initial conversion price of approximately $10.47 per share of our common stock. The Convertible Notes are convertible at the option of the holders at any time prior to the close of business on the business day immediately preceding February 15, 2026, only under the following circumstances:

•During any calendar quarter (and only during such calendar quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;

•During the five business day period after any ten consecutive trading day period (the “measurement period”), in which the “trading price” (as defined in the indenture governing the Convertible Notes) per $1,000 principal amount of the Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such trading day;

•If we call such Convertible Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or

•Upon the occurrence of specified corporate events as set forth in the indenture governing the Convertible Notes.

On or after February 15, 2026, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the Convertible Notes may convert all or any portion of their Convertible Notes regardless of the foregoing circumstances.

Since we have the election of repaying the Convertible Notes in cash, shares of our common stock, or a combination of both, we continued to classify the Convertible Notes as long-term debt on the consolidated balance sheets as of December 31, 2023.

We may redeem for cash all or any portion of the Convertible Notes (subject to the partial redemption limitation described in the indenture governing the Convertible Notes), at our option, on or after May 20, 2024 and prior to the 31st scheduled trading day immediately preceding the maturity date, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on the trading day immediately preceding the date on which we provide notice of redemption, at a redemption price equal to 100% of the principal amount of the Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.

If we undergo a fundamental change (as set forth in the indenture governing the Convertible Notes), noteholders may require us to repurchase for cash all or any portion of their Convertible Notes at a repurchase price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, following certain corporate events (as set forth in the indenture governing the Convertible Notes) or if we deliver a notice of redemption prior to the maturity date, we will, in certain circumstances, adjust the conversion rate for a noteholder who elects to convert its notes in connection with such a corporate event or such notice of redemption.

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We accounted for the Convertible Notes as a single liability in accordance with ASU 2020-06 - Accounting for Convertible Instruments and Contracts in an Entity's Own Equity (“ASU 2020-06”). As of December 31, 2023, the Convertible Notes were recorded at the aggregate principal amount of $225.5 million less unamortized issuance costs of $2.8 million as a long-term liability on the consolidated balance sheets. As of December 31, 2023, the fair value of the Convertible Notes was $330.1 million. The fair value was estimated using a reputable third-party valuation model based on observable inputs and is considered Level 2 in the fair value hierarchy. The debt issuance costs are amortized to interest expense over the contractual term of the Convertible Notes at an effective interest rate of 3.1%.

The following table presents the components of interest expense related to Convertible Notes (in thousands):

	Year Ended December 31,
	2023		2022
Stated coupon interest	$	5,636	$	5,638
Amortization of debt issuance cost		1,121		1,094
Total interest expense	$	6,757	$	6,732

Capped Calls

In connection with the issuance of the Convertible Notes, we entered into capped call transactions with one of the initial purchasers of the Convertible Notes and other financial institutions, totaling $27.2 million (the “Capped Calls”). The Capped Calls cover, subject to customary adjustments, the number of shares of our common stock that initially underlie the Convertible Notes (or 21,542,871 shares of our common stock). The Capped Calls have an initial strike price and an initial cap price of $10.47 per share and $15.80 per share, respectively, subject to certain adjustments. Conditions that cause adjustments to the initial strike price of the Capped Calls mirror conditions that result in corresponding adjustments to the conversion price of the Convertible Notes. The Capped Calls are expected to offset the potential dilution to our common stock as a result of any conversion of the Convertible Notes, subject to a cap based on the cap price.

For accounting purposes, the Capped Calls are considered separate financial instruments and not part of the Convertible Notes. As the Capped Calls transactions meet certain accounting criteria, we recorded the cost of the Capped Calls, totaling $27.2 million, as a reduction to additional paid-in capital within the consolidated statements of stockholders’ equity.

11.Long-Term Debt

Long-Term Debt

On February 20, 2018, we entered into a $175.0 million term Loan Agreement with CRG Servicing LLC. We borrowed $100.0 million under the Loan Agreement at closing and the remaining $75.0 million in March 2019 (collectively, “Term Loans”). Net proceeds under the Loan Agreement were $173.3 million. The Term Loans under the Loan Agreement bore interest at a rate equal to 9.5% per annum. The Term Loans had a maturity date of December 31, 2023.

In May 2021, we repaid the principal on the Term Loans, in full, using the net proceeds from the Convertible Notes issuance. In connection with the early repayment of the Term Loans, in the year ended December 31, 2021, we recorded $5.2 million loss on debt extinguishment related to the amount we paid to terminate the Term Loans in excess of its carrying value at the time of the repayment. Our final payment of $190.2 million to CRG Servicing LLC satisfied all of our obligations under the Loan Agreement. With the full repayment of the Term Loans, all security interests, covenants, liens and encumbrances under the Loan Agreement were permanently released.

We recorded $7.0 million of interest expense related to the Term Loans during the year ended December 31, 2021.

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12.Revenue Recognition

Disaggregation of Revenues

The following table disaggregates our product revenue, net by product and geographic region and disaggregates our other revenues by geographic region (in thousands):

	Year Ended						Year Ended						Year Ended
	December 31, 2023						December 31, 2022						December 31, 2021
	U.S.		Non U.S.		Total		U.S.		Non U.S.		Total		U.S.		Non U.S.		Total
Product revenue, net
HEPLISAV-B	$	213,295	$	-	$	213,295	$	124,996	$	941	$	125,937	$	61,870	$	-	$	61,870
CpG 1018 adjuvant		-		-		-		-		587,708		587,708		-		375,229		375,229
Total product revenue, net	$	213,295	$	-	$	213,295	$	124,996	$	588,649	$	713,645	$	61,870	$	375,229	$	437,099
Other revenue		17,650		1,339		18,989		8,774		264		9,038		1,915		428		2,343
Total revenues	$	230,945	$	1,339	$	232,284	$	133,770	$	588,913	$	722,683	$	63,785	$	375,657	$	439,442

Revenues from Major Customers and Collaboration Partners

All of our HEPLISAV-B sales in the U.S. are to certain wholesalers and specialty distributors whose principal customers include independent hospitals and clinics, integrated delivery networks, public health clinics and prisons, the Department of Defense, the Department of Veterans Affairs and retail pharmacies. All of our HEPLISAV-B sales in Germany are to one distributor.

The following table summarizes HEPLISAV-B product revenue from each of our three largest customers (as a percentage of total HEPLISAV-B net product revenue):

	Year Ended
	December 31,
	2023			2022			2021
Largest customer		28	%		21	%		21	%
Second largest customer		27	%		17	%		19	%
Third largest customer		17	%		16	%		19	%

The following table summarizes CpG 1018 adjuvant product revenue from each of our three largest collaboration partners (as a percentage of total CpG 1018 adjuvant product revenue):

	Year Ended
	December 31,
	2023			2022			2021
Largest collaboration partner		0	%		49	%		49	%
Second largest collaboration partner		0	%		35	%		24	%
Third largest collaboration partner		0	%		12	%		19	%

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Contract Balances

The following table summarizes balances and activities in HEPLISAV-B product revenue allowance and reserve categories (in thousands):

	Balance at Beginning of Period		Provisions related to current period sales		Credit or payments made during the period			Adjustments related to prior periods			Balance at End of Period
Year ended December 31, 2023:
Accounts receivable reserves (1)	$	8,179	$	55,604	$	(54,143	)	$	(2,629	)	$	7,011
Revenue reserve accruals (2)	$	10,552	$	46,062	$	(38,207	)	$	2,597		$	21,004
Year ended December 31, 2022:
Accounts receivable reserves (1)	$	3,823	$	34,758	$	(30,402	)	$	-		$	8,179
Revenue reserve accruals (2)	$	8,253	$	24,806	$	(22,507	)	$	-		$	10,552

(1) Reserves are for chargebacks, discounts and other fees.

(2) Accruals are for returns, rebates and other fees.

When we transfer control of CpG 1018 adjuvant that is reserved under the CEPI Agreement to Clover and perform services under our agreement with the DoD, we recognize product revenue and a corresponding contract asset as our right to consideration is conditioned on something other than the passage of time. See Note 9 for further discussion. The following table summarizes balances and activities in our contract asset account (in thousands):

	Balance at Beginning of Period		Additions		Subtractions			Reclassification (1)			Balance at End of Period
Year ended December 31, 2023:
Contract asset, included in other current assets (2)	$	71,965	$	17,650	$	(16,919	)	$	(71,307	)	$	1,389
Contract asset, included in other assets (long term)	$	-	$	-	$	-		$	71,307		$	71,307
Year ended December 31, 2022:
Contract asset	$	62,525	$	17,556	$	(8,116	)	$	-		$	71,965

(1) The Clover contract asset was reclassified to long term assets to reflect the timing of expected long term demand for CpG 1018 adjuvant for Clover Product. See Note 9 for further discussion.

(2) The $1.4 million of contract asset is derived from our agreement with the DoD.
 

13.Net (Loss) Income Per Share

Basic net (loss) income per share is computed by dividing net (loss) income attributable to common stockholders by the weighted-average number of shares of our common stock outstanding.

For the calculation of diluted net income per share, net income attributable to common stockholders for basic net income per share is adjusted by the effect of dilutive securities, including awards under our equity compensation plans and change in fair value of warrant liability. Diluted net income per share attributable to common stockholders is computed by dividing the resulting net income attributable to common stockholders by the weighted-average number of fully diluted common shares outstanding.

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The numerators and denominators of the basic net (loss) income and diluted net income per share computations for our common stock are calculated as follows (in thousands):

	Year Ended
	December 31,
	2023			2022			2021
Numerator
Net (loss) income	$	(6,389	)	$	293,156		$	76,713
Less: undistributed earnings allocated to participating securities					(283	)		(4,569	)
Net (loss) income allocable to common stockholders, basic		(6,389	)		292,873			72,144
Add: undistributed earnings allocated to Series B and warrants		-			283			4,569
Less: undistributed earnings allocated to Series B and warrants		-			-			(4,190	)
Add: interest expense on convertible notes		-			5,044			3,168
Less: removal of change in fair value of warrant liability		-			(1,801	)		-
Net (loss) income allocable to common stockholders, diluted	$	(6,389	)	$	296,399		$	75,691
Denominator
Weighted average shares used to compute net (loss) income    allocable to common stockholders per share, basic		128,733			126,398			116,264
Effect of dilutive shares:
Stock-based compensation plans		-			2,774			3,075
Convertible Notes (as converted to common stock)		-			21,543			13,667
Effect of dilutive warrants		-			82			-
Weighted average shares used to compute net (loss) income    allocable to common stockholders per share, diluted		128,733			150,797			133,006

The following were excluded from the calculation of diluted net (loss) income per share as the effect of their inclusion would have been anti-dilutive (in thousands).

	December 31,
	2023		2022		2021
Outstanding securities not included in diluted net (loss) income    allocable to common stockholders per share calculation    (in thousands):
Stock options and stock awards		15,158		7,165		5,953
Convertible Notes (as converted to common stock)		21,543		-		-
Warrants (as exercisable into common stock)		-		-		1,883

14.Common Stock and Warrants

Common Stock Outstanding

As of December 31, 2023, there were 129,530,228 shares of our common stock outstanding.

We entered into an at-the-market Sales Agreement with Cowen and Company, LLC (“Cowen”) on August 6, 2020 and an amendment to such agreement on August 3, 2023 (the sales agreement as amended, the “ATM Agreement”). Under the ATM Agreement, we may offer and sell from time to time, at our sole discretion, shares of our common stock having an aggregate offering price of up to $120.0 million through Cowen as our sales agent. We agreed to pay Cowen a commission of up to 3% of the gross sales proceeds of any common stock sold through Cowen under the ATM Agreement. As of December 31, 2023, we had approximately $120.0 million remaining under the ATM Agreement.

Warrants

During the year ended December 31, 2022, all of the 1,882,600 outstanding warrants as of December 31, 2021 were exercised or expired, resulting in cash proceeds totaling $8.5 million. For the year ended December 31, 2022, we recognized

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the decrease in the estimated fair value of warrant liability of $1.8 million as income in other income (expense) in our consolidated statements of operations.

15.Equity Plans and Stock-Based Compensation

Equity Plans

In January 2021, we adopted the Dynavax Technologies Corporation 2021 Inducement Award Plan (“2021 Inducement Plan”), pursuant to which we reserved 1,500,000 shares of common stock for issuance under the plan to be used exclusively for grants of awards to individuals who were not previously our employees or directors. In June 2021, we amended the 2021 Inducement Plan (“Amended 2021 Inducement Plan”) to increase the number of shares of common stock reserved under the 2021 Inducement Plan to 3,250,000. The Amended 2021 Inducement Plan was terminated effective as of April 3, 2022 and, therefore, there are no shares of our common stock available for grant.

In May 2022, our stockholders approved the amendment and restatement of our 2018 Equity Incentive Plan (the “Amended 2018 EIP”) to, among other things, increase the authorized number of shares of common stock by 15,000,000. The maximum number of shares of common stock that may be issued under the Amended 2018 EIP, will not exceed 32,600,000 shares of common stock. As of December 31, 2023, the Amended 2018 EIP and the Amended and Restated 2014 Employee Stock Purchase Plan are our active plans (the "Plans").

The Amended 2018 EIP is administered by our Board of Directors, or a designated committee of the Board of Directors, and awards granted under the Amended 2018 EIP have a term of 7 years unless earlier terminated by the Board of Directors. As of December 31, 2023, there were 9,388,428 shares of common stock reserved for issuance under the Amended 2018 EIP.

Under our Amended 2018 EIP, we may grant stock options, RSUs, performance-based awards, and other awards that are settled in shares of our common stock. Our equity awards generally vest over a three-year period contingent upon continuous service and unless exercised, expire seven or ten years from the date of grant (or earlier upon termination of continuous service). Activity under our stock plans is set forth below:

Stock Options

The following table summarizes the activity of stock options for the year ended December 31, 2023:

	Shares Underlying Outstanding Options (in thousands)			Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2022		9,339		$	10.70		4.61	$	16,291
Options granted		1,982			11.17
Options exercised		(850	)		7.48
Options cancelled:
Options forfeited (unvested)		(90	)		10.93
Options expired (vested)		(261	)		21.39
Balance at December 31, 2023		10,120		$	10.78		4.18	$	37,388
Vested and expected to vest at December 31, 2023		9,976		$	10.77		4.15	$	37,024
Exercisable at December 31, 2023		7,014		$	10.40		3.50	$	29,613

Stock-based compensation expense related to options was approximately $18.7 million, $17.2 million and $11.1 million for the years ended December 31, 2023, 2022 and 2021, respectively. The total intrinsic value of stock options exercised during the years ended December 31, 2023, 2022 and 2021 was $5.0 million, $7.7 million, and $7.9 million, respectively. The total intrinsic value of exercised stock options is calculated based on the difference between the exercise price and the quoted market price of our common stock as of the close of the exercise date.

The total fair value of stock options vested during the years ended December 31, 2023, 2022 and 2021 was $19.5 million, $17.5 million and $9.0 million, respectively.

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Restricted Stock Units

The following table summarizes the activity of RSUs for the year ended December 31, 2023:

	Number of Shares (In thousands)			Weighted-Average Grant-Date Fair Value
Non-vested as of December 31, 2022		3,479		$	11.00
Granted		2,748			11.48
Vested (1)		(1,515	)		10.13
Forfeited		(267	)		11.45
Non-vested as of December 31, 2023		4,445		$	11.57

(1) Inclusive of approximately 600,145 RSUs for the year ended December 31, 2023, which were not converted into shares due to net share settlement in order to cover the required amount of employee withholding taxes. The value of the withheld shares was classified as a reduction to additional paid-in capital.

Stock-based compensation expense related to RSUs was approximately $20.4 million, $13.2 million and $7.9 million for the years ended December 31, 2023, 2022 and 2021, respectively. The aggregate fair value of the RSUs outstanding as of December 31, 2023, 2022 and 2021, based on our stock price on that date, was $62.2 million, $37.0 million and $37.3 million, respectively.

The total fair value of RSUs vested during the years ended December 31, 2023, 2022 and 2021 was $16.1 million, $15.7 million and $4.7 million, respectively.

Market-based Performance Stock Units

We granted PSUs to certain executives. These PSUs vest upon a specified market condition. The summary of PSU activities for the year ended December 31, 2023 is as follows:

	Number of Shares (in thousands)		Weighted-Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2022		193	$	11.62
Granted		364		18.25
Non-vested as of December 31, 2023		557	$	15.95

Stock-based compensation expense related to PSUs was approximately $2.5 million, $0.8 million and $1.8 million for the years ended December 31, 2023, 2022 and 2021, respectively. The aggregate intrinsic value of the PSUs outstanding as of December 31, 2023, 2022 and 2021, based on our stock price on that date, was $7.8 million, $2.1 million and $3.3 million, respectively.

Performance-based Options

As of December 31, 2023, approximately 36,000 shares underlying performance-based options were outstanding.

Significant Assumptions in Estimating Option Fair Value

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The fair value of each time-based option is estimated on the date of grant using the Black-Scholes option valuation model. The fair value of each RSU is determined at the date of grant using our closing stock price. The fair value of each PSU is estimated using the Monte Carlo simulation method on the date of grant. The weighted-average assumptions used in the calculations of these fair value measurements are as follows:

	Stock Options									Market-Based Performance Stock Units								Employee Stock Purchase Plan
	Year Ended December 31,									Year Ended December 31,								Year Ended December 31,
	2023			2022			2021			2023			2022			2021		2023			2022			2021
Weighted-average fair value	$	7.32		$	7.95		$	7.17		$	18.25		$	11.62		$	8.40	$	5.35		$	7.37		$	6.48
Risk-free interest rate		4.0	%		2.0	%		0.7	%		4.3	%		1.7	%	From 0.03% to 1.92%			4.9	%		2.1	%		0.1	%
Expected life (in years)		4.5			4.5			4.5			2.9			2.9			2.9		1.3			1.3			1.2
Expected volatility		0.8			0.8			0.9			0.9			0.9			0.9		0.7			1.0			1.0

Expected volatility is based on historical volatility of our stock price. The expected life of options granted is estimated based on historical option exercise and employee termination data. Our senior management, who hold a majority of the options outstanding, and other employees were grouped and considered separately for valuation purposes. The risk-free rate for periods within the contractual life of the option is based on the U.S. treasury yield curve in effect at the time of grant. Forfeiture estimates are based on historical employee turnover. The dividend yield is zero percent for all years and is based on our history and expectation of dividend payouts.

Stock-based Compensation

Compensation expense is based on awards ultimately expected to vest and reflects estimated forfeitures. For equity awards with time-based vesting, the fair value is amortized to expense on a straight-line basis over the vesting periods.

We have also granted performance-based equity awards to certain of our employees. For equity awards with performance-based vesting criteria, the fair value is amortized to expense when the achievement of the vesting criteria becomes probable.

The following table summarizes stock-based compensation expense recorded in each component of operating expenses in our consolidated statements of operations, and amounts capitalized to our inventories (in thousands):

	Year Ended December 31,
	2023		2022		2021
Employees and directors stock-based compensation expense	$	42,592	$	32,915	$	21,285
	Year Ended December 31,
	2023		2022		2021
Research and development	$	9,285	$	5,954	$	3,818
Selling, general and administrative		29,069		23,118		14,894
Cost of sales - product		1,839		1,123		553
Inventories		2,399		2,720		2,020
Total	$	42,592	$	32,915	$	21,285

As of December 31, 2023, the total unrecognized compensation cost related to non-vested stock options and RSUs deemed probable of vesting, including all stock options with time-based vesting, net of estimated forfeitures, amounted to $46.1 million, which is expected to be recognized over the remaining weighted-average vesting period of 1.6 years. As of December 31, 2023, the total unrecognized compensation cost related to PSUs amounted to $5.5 million.

Employee Stock Purchase Plan

The Amended and Restated 2014 Employee Stock Purchase Plan (the “Employee Stock Purchase Plan”) provides for the purchase of common stock by eligible employees. In May 2021, our stockholders approved the amendment and restatement of the Employee Stock Purchase Plan to increase the authorized number of shares of common stock by 1,000,000. The maximum number of shares of common stock that may be issued under the Employee Stock Purchase Plan will not exceed 1,850,000 shares of common stock.

103

The purchase price per share is the lesser of (i) 85% of the fair market value of the common stock on the commencement of the two-year offer period (generally, the sixteenth day in February or August) or (ii) 85% of the fair market value of the common stock on the exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August). For the year ended December 31, 2023, employees have acquired approximately 161,000 shares of our common stock under the Employee Stock Purchase Plan and approximately 722,000 shares of our common stock remained available for future purchases under the Employee Stock Purchase Plan.

As of December 31, 2023, the total unrecognized compensation cost related to shares of our common stock under the Employee Stock Purchase Plan amounted to $1.0 million, which is expected to be recognized over the remaining weighted-average vesting period of 1.2 years.

16.Employee Benefit Plan

We maintain a 401(k) Plan, which qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code. Under the 401(k) Plan, participating employees may defer a portion of their pretax earnings. We may, at our discretion, contribute for the benefit of eligible employees. Our contribution to the 401(k) Plan was approximately $1.3 million, $0.9 million and $0.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

17.Income Taxes

Consolidated (loss) income before provision for income taxes consisted of the following (in thousands):

	Year Ended December 31,
	2023			2022		2021
U.S.	$	(6,275	)	$	292,460	$	75,954
Non U.S.		1,908			1,839		1,567
Total	$	(4,367	)	$	294,299	$	77,521

The components of the consolidated income tax provision for the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31, 2023			Year Ended December 31, 2022			Year Ended December 31, 2021
Current
Federal	$	(178	)	$	(165	)	$	345
State		1,533			897			260
Non-US		667			411			203
Total current tax expense		2,022			1,143			808
Deferred
Federal		-			-			-
State		-			-			-
Non-US		-			-			-
Total deferred tax expense		-			-			-
Total income tax expense	$	2,022		$	1,143		$	808

104

The difference between the consolidated income tax provision and the amount computed by applying the federal statutory income tax rate to the consolidated income before income taxes in the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Income tax provision (benefit) at federal statutory rate	$	(917	)	$	61,775		$	16,397
State tax		574			(2,942	)		3,576
Business credits		(2,050	)		(3,246	)		(982	)
Uncertain tax positions		334			586			424
Deferred compensation charges		830			(473	)		131
Change in valuation allowance		1,466			(324	)		(86,847	)
Section 162(m) limitation		1,963			1,779			1,241
Mark-to-market of warrants		-			(378	)		10,364
Net operating loss and tax credit limitation		-			(56,908	)		56,459
Other (1)		(518	)		879			(290	)
Foreign taxes		340			395			335
Total income tax expense	$	2,022		$	1,143		$	808

(1) Certain prior year amounts have been reclassified to conform to the current year presentation. In 2022 and 2021, Foreign taxes were included in Other.

Deferred tax assets and liabilities consisted of the following (in thousands):

	December 31,
	2023			2022
Deferred tax assets:
Net operating loss carryforwards	$	96,336		$	113,228
Research credit carryforwards		34,940			33,444
Section 174 capitalization		22,556			15,308
Lease liability		8,868			9,530
Stock compensation		10,572			7,780
Accruals and reserves		15,808			9,089
Other		348			337
Total deferred tax assets		189,428			188,716
Less valuation allowance		(180,387	)		(178,920	)
Net deferred tax assets		9,041			9,796
Deferred tax liabilities:
Fixed assets		(2,667	)		(2,916	)
Operating lease right-of-use assets		(6,345	)		(6,785	)
Other		(29	)		(95	)
Total deferred tax liabilities		(9,041	)		(9,796	)
Net deferred tax assets	$	-		$	-

The tax benefit of net operating losses, temporary differences and credit carryforwards is required to be recorded as an asset to the extent that management assesses that realization is "more likely than not." Realization of the future tax benefits is dependent on our ability to generate sufficient taxable income within the carryforward period. A high degree of judgment is required to determine if, and the extent to which, valuation allowances should be recorded against deferred tax assets. In making such determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations. Based on all available evidence as of December 31, 2023, both positive and negative, and the weight of that evidence to the extent such evidence can be objectively verified, management believes that recognition of the deferred tax assets arising from the above-mentioned future tax benefits is currently not more likely than not to be realized, and, accordingly, has provided a valuation allowance.

105

The valuation allowance increased by $1.5 million during the year ended December 31, 2023 and decreased by $0.3 million during the year ended December 31, 2022. The increase in valuation allowance during the year ended December 31, 2023 was due to an increase in our deferred tax assets, predominantly related to Section 174 capitalization and increased reserves largely offset by utilization of net operating losses. The decrease in valuation allowance during the year ended December 31, 2022 was due to a decrease in our deferred tax assets, predominantly related to utilization of net operating losses, offset by updates to the Section 382 analysis.

As of December 31, 2023, we had federal net operating loss carryforwards of approximately $23.1 million, which began to expire in the year 2024, federal net operating loss carryforwards of approximately $353.5 million, which do not expire and federal research and development tax credits of approximately $28.3 million, which expire in the years 2024 through 2043.

As of December 31, 2023, we had net operating loss carryforwards for California and other states for income tax purposes of approximately $283.9 million, which expire in the years 2024 through 2040, and California state research and development tax credits of approximately $22.3 million, which do not expire.

As of December 31, 2023, we had no remaining net operating loss carryforwards for foreign income tax purposes.

Uncertain Income Tax positions

The total amount of unrecognized tax benefits was $12.1 million and $11.3 million as of December 31, 2023 and 2022, respectively. If recognized, none of the unrecognized tax benefits would affect the effective tax rate.

The following table summarizes the activity related to our unrecognized tax benefits:

	Year Ended December 31,
	2023			2022
Balance at beginning of year	$	(11,339	)	$	(5,615	)
Tax positions related to the current year
Additions		(762	)		(670	)
Reductions		-			-
Tax positions related to the prior year
Additions		-			(5,054	)
Reductions		-			-
Settlements		-			-
Lapses in statute					-
Balance at end of year	$	(12,101	)	$	(11,339	)

Our policy is to account for interest and penalties as income tax expense. As of December 31, 2023, there was no interest and no penalties recognized in the provision for income taxes. As of December 31, 2022, there were no interest and no penalties recognized in the provision for income taxes. We do not anticipate any significant change within 12 months of this reporting date of its uncertain tax positions.

The Tax Reform Act of 1986 limits the annual use of net operating loss and tax credit carryforwards in certain situations where changes occur in stock ownership of a company. In the event there is a change in ownership, as defined, the annual utilization of such carryforwards could be limited. For the year ended December 31, 2021, we completed a preliminary analysis under Section 382 of the Internal Revenue Code indicating we experienced ownership changes in 2008, 2010, 2012, and 2019 that limited the future use of our pre-change federal and state net operating loss carryforwards and federal research and development tax credits. We finalized the study during the year ended December 31, 2022 and concluded that we only experienced ownership changes in 2008, 2010, and 2012, resulting in a significant reduction in the federal and state net operating loss carryforwards and federal research and development tax credits that are expected to expire unused. We have revised the net operating loss carryforwards and research and development tax credits that are expected to expire unused as a result of the annual limitations in the deferred tax assets and corresponding uncertain tax positions as of December 31, 2022. There were no changes to our Section 382 analysis as of December 31, 2023.

106

We are subject to income tax examinations for U.S. federal and state income taxes from 2002 forward. We are subject to tax examination in Germany from 2018 forward, in India from 2019 forward and in Italy from 2021 forward.

107

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

(a) Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934 (“the Exchange Act”)) that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission rules and forms and that such information is accumulated and communicated to our management, including our Principal Executive Officer and Principal Financial Officer, as appropriate, to allow for timely decisions regarding required disclosure. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can only provide reasonable, not absolute, assurance of achieving the desired control objectives.

Based on their evaluation of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this report, our management, with the participation of our Principal Executive Officer and our Principal Financial Officer, concluded that our disclosure controls and procedures are effective and were operating at the reasonable assurance level to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission rules and forms.

(b) Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework). Based on that evaluation, our management concluded that our internal control over financial reporting was effective as of December 31, 2023. Our independent registered public accountants, Ernst & Young LLP, audited the consolidated financial statements included in this Annual Report on Form 10-K and have issued a report on our internal control over financial reporting. The report on the audit of internal control over financial reporting appears below.

108

Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Dynavax Technologies Corporation

Opinion on Internal Control over Financial Reporting

We have audited Dynavax Technologies Corporation’s internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Dynavax Technologies Corporation (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2023 and 2022, and the related consolidated statements of operations, comprehensive (loss) income, stockholders’ equity and cash flows for each of the three years in the period ended December 31, 2023 and the related notes of the Company and our report dated February 22, 2024 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young LLP

San Francisco, California

February 22, 2024

109

(c) Changes in Internal Control Over Financial Reporting

There has been no change in our internal control over financial reporting during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B. OTHER INFORMATION

None.

ITEM 9C. DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

Not applicable.

110

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Information required by this Item is incorporated by reference to the sections entitled “Proposal 1—Election of Directors,” “Executive Officers,” “Corporate Governance” and “Delinquent Section 16(a) Reports” in our Definitive Proxy Statement in connection with the 2024 Annual Meeting of Stockholders (the “Proxy Statement”) which we expect will be filed with the Securities and Exchange Commission within 120 days after the fiscal year ended December 31, 2023.

We have adopted the Dynavax Code of Business Conduct and Ethics (“Code of Conduct”), a code of ethics that applies to our employees, including our Chief Executive Officer, Chief Financial Officer and to our non-employee directors. The Code of Conduct is publicly available on our website under the header “Investors” and within that under the header “Corporate Governance and Compliance” at www.dynavax.com. This website address is intended to be an inactive, textual reference only; none of the material on this website is part of this report. If any substantive amendments are made to the Code of Conduct or any waiver granted, including any implicit waiver, from a provision of the Code of Conduct to our Chief Executive Officer or Chief Financial Officer, we will disclose the nature of such amendment or waiver on that website or in a report on Form 8-K. We will provide a written copy of the Dynavax Code of Conduct to anyone without charge, upon request written to Dynavax, Attention: Corporate Secretary, 2100 Powell Street, Suite 720, Emeryville, CA 94608, (510) 848-5100.

ITEM 11. EXECUTIVE COMPENSATION

Information required by this Item is incorporated by reference to the section entitled “Compensation Discussion and Analysis,” “Summary Compensation Table,” “Grants of Plan Based Awards,” “Outstanding Equity Awards at Fiscal Year End,” and “Corporate Governance” in the Proxy Statement.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Information regarding security ownership of certain beneficial owners and management is incorporated by reference to the sections entitled “Security Ownership of Certain Beneficial Owners and Management” in the Proxy Statement. Information regarding our stockholder approved and non-approved equity compensation plans are incorporated by reference to the section entitled “Equity Compensation Plan Information” in the Proxy Statement.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Information required by this Item is incorporated by reference to the sections entitled “Certain Transactions” and “Independence of the Board of Directors” in the Proxy Statement.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

Information required by this Item is incorporated by reference to the section entitled “Audit Fees” in the Proxy Statement.

111

PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a) Documents filed as part of this report:

1. Financial Statements

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets

Consolidated Statements of Operations

Consolidated Statements of Comprehensive (Loss) Income

Consolidated Statements of Stockholders’ Equity

Consolidated Statements of Cash Flows

Notes to Consolidated Financial Statements

2. Financial Statement Schedules

None, as all required disclosures have been made in the Consolidated Financial Statements and notes thereto or are not applicable.

(b) Exhibits

		Incorporated by Reference
Exhibit Number	Document		Exhibit Number	Filing	Filing Date	File No.	Filed Herewith
3.1	Sixth Amended and Restated Certificate of Incorporation		3.1	S-1/A	February 5, 2004	333-109965
3.2	Certificate of Amendment of Amended and Restated Certificate of Incorporation		3.1	8-K	January 4, 2010	001-34207
3.3	Certificate of Amendment of Amended and Restated Certificate of Incorporation		3.1	8-K	January 5, 2011	001-34207
3.4	Certificate of Amendment of Amended and Restated Certificate of Incorporation		3.6	8-K	May 30, 2013	001-34207
3.5	Certificate of Amendment of the Sixth Amended and Restated Certificate of Incorporation		3.1	8-K	November 10, 2014	001-34207
3.6	Certificate of Amendment of the Sixth Amended and Restated Certificate of Incorporation		3.1	8-K	June 2, 2017	001-34207
3.7	Certificate of Amendment of the Sixth Amended and Restated Certificate of Incorporation		3.1	8-K	July 31, 2017	001-34207
3.8	Certificate of Amendment of the Sixth Amended and Restated Certificate of Incorporation		3.1	8-K	May 29, 2020	001-34207
3.9	Amended and Restated Bylaws		3.8	10-Q	November 6, 2018	001-34207

112

4.1	Description of Capital Stock	4.1	10-K	February 28, 2022	001-34207
4.2	Reference is made to Exhibits 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8 and 3.9 above
4.3	Form of Specimen Common Stock Certificate	4.2	S-1/A	January 16, 2004	333-109965
4.4	Indenture between Company and U.S. Bank National Association, as trustee, dated May 13, 2021	4.1	8-K	May 13, 2021	001-34207
4.5	Form of Global Note, representing Dynavax Technologies Corporation’s 2.5% Convertible Senior Notes due 2026	4.2	8-K	May 13, 2021	001-34207
10.1+	Employment Agreement, dated July 12, 2013, by and between Robert Janssen, M.D. and Company	10.85	10-K	March 10, 2014	001-34207
10.2+	Chief Executive Officer Letter, dated December 13, 2019, between Company and Ryan Spencer	10.17	10-K	March 11, 2020	001-34207
10.3+	President and Chief Operating Officer Letter, dated December 13, 2019, between Company and David Novack	10.18	10-K	March 11, 2020	001-34207
10.4+	Offer Letter, dated December 14, 2020, by and between Company and Kelly MacDonald	10.33	10-K	February 25, 2021	001-34207
10.5+	Consulting Agreement, effective January 16, 2023, between Company and Peter Paradiso	10.1	10-Q	May 2, 2023	001-34207
10.6+	Form of Indemnification Agreement	10.1	10-Q	November 7, 2019	001-34207
10.7+	Form of Management Continuity and Severance Agreement between Company and certain of its executive officers	10.3	10-Q	August 3, 2023	001-34207
10.8+	Dynavax Technologies Corporation U.S. Annual Bonus Plan	10.23	10-K	March 11, 2020	001-34207
10.9+	Non-Employee Director Compensation Policy	10.34	10-K	February 28, 2022	001-34207

113

10.10	Sales Agreement, dated August 6, 2020, between Company and Cowen and Company, LLC	10.3	10-Q	August 6, 2020	001-34207
10.11	Form of Confirmation for Capped Call Transactions	10.1	8-K	May 13, 2021	001-34207
10.12+	Dynavax Technologies Corporation Amended and Restated 2014 Employee Stock Purchase Plan	Appendix A	DEF 14A	April 16, 2021	001-34207
10.13+	Amended and Restated Dynavax Technologies Corporation 2018 Equity Incentive Plan	Appendix A	DEF 14A	April 14, 2022	001-34207
10.14+	Form of Option Grant Notice and Option Agreement under the 2018 Equity Incentive Plan	10.3	8-K	June 1, 2018	001-34207
10.15+	Form of Restricted Stock Unit Award Grant Notice and Restricted Stock Unit Award Agreement under the 2018 Equity Incentive Plan	10.2	8-K	June 1, 2018	001-34207
10.16+	Restricted Stock Unit Award Agreement for Directors under the 2018 Equity Incentive Plan	10.11	10-K	February 28, 2022	001-34207
10.17+	Amended and Restated Dynavax Technologies Corporation 2021 Inducement Award Plan	10.3	10-Q	August 4, 2021	001-34207
10.18	Office/Laboratory Lease, dated September 17, 2018, between Company and Emery Station West, LLC	10.1	10-Q	November 6, 2018	001-34207
10.19	Sublease, dated July 12, 2019, by and between Company and Zymergen Inc.	10.3	10-Q	November 7, 2019	001-34207
10.20	Commercial Lease Agreement, dated September 13, 2021, by and between Onyx Düsseldorf S.à r.l. and Dynavax GmbH	10.2	10-Q	November 4, 2021	001-34207
10.21	Lease Agreement, dated March 15, 2022, by and between Company and SPUS8 2100 Powell, L.P.	10.1	10-Q	May 5, 2022	001-34207
10.22†	Commercial Manufacturing and Supply Agreement, dated November 22, 2013, between Company and Baxter Pharmaceutical Solutions LLC	10.33	10-K	March 8, 2018	001-34207
10.23^	First Amendment to Commercial Manufacturing and	10.3	10-Q	November 4, 2021	001-34207

114

	Supply Agreement, dated September 10, 2021, by and between Company and Baxter Pharmaceutical Solutions LLC
10.24†	Supply Agreement, dated July 27, 2016, between Company and West Pharmaceutical Services, Inc.	10.36	10-K	March 8, 2018	001-34207
10.25^	Agreement, dated January 29, 2021 between Company and Coalition for Epidemic Preparedness Innovations	10.31	10-K	February 25, 2021	001-34207
10.26^	First Amendment to Agreement, dated May 3, 2021, by and between Company and Coalition for Epidemic Preparedness Innovations	10.1	10-Q	August 4, 2021	001-34207
10.27^	Waiver and Second Amendment to Agreement, dated effective as of April 27, 2023, by and between Company and Coalition for Epidemic Preparedness Innovations	10.2	10-Q	August 3, 2023	001-34207
10.28^	Supply Agreement, dated effective April 1, 2021, between Company and Becton, Dickinson and Company	10.35	10-K	February 23, 2023	001-34207
10.29^	Amendment #1 to Supply Agreement, dated September 28, 2022, between Company and Becton, Dickinson and Company	10.36	10-K	February 23, 2023	001-34207
10.30^	Supply Agreement, dated June 29, 2021, by and among Company, Zhejiang Clover Biopharmaceuticals, Inc., and Clover Biopharmaceuticals (Hong Kong) Co., Limited	10.6	10-Q	August 4, 2021	001-34207
10.31^	Letter Agreement, dated August 30, 2022, by and among Company, Zhejiang Clover Biopharmaceuticals, Inc., Clover Biopharmaceuticals (Hong Kong) Co., Limited and Sichuan Clover Biopharmaceuticals, Inc.	10.2	10-Q	November 3, 2022	001-34207
10.32^	Letter Agreement No. 2, dated October 31, 2022, by and among Company, Zhejiang Clover Biopharmaceuticals, Inc. and Clover Biopharmaceuticals (Hong Kong) Co., Limited	10.4	10-Q	November 3, 2022	001-34207

115

10.33^	Amendment No. 3 to Supply Agreement, effective August 15, 2022, by and among Company, Zhejiang Clover Biopharmaceuticals, Inc., and Clover Biopharmaceuticals (Hong Kong) Co., Limited	10.37	10-K	February 23, 2023	001-34207
10.34^	Amendment No. 4 to Supply Agreement, effective September 23, 2022, by and among Company, Zhejiang Clover Biopharmaceuticals, Inc., and Clover Biopharmaceuticals (Hong Kong) Co., Limited	10.38	10-K	February 23, 2023	001-34207
10.35^	Supply Agreement, dated July 1, 2021, by and between Company and Biological E. Limited	10.7	10-Q	August 4, 2021	001-34207
10.36^	Amendment No. 1 to Supply Agreement, dated effective as of June 23, 2022, by and between Company and Biological E. Limited	10.1	10-Q	November 3, 2022	001-34207
10.37^	Amendment No. 2 to Supply Agreement, dated effective as of September 30, 2022, by and between Company and Biological E. Limited	10.3	10-Q	November 3, 2022	001-34207
10.38^	Amendment No. 3 to Supply Agreement, dated effective as of April 26, 2023, by and between Company and Biological E. Limited	10.1	10-Q	August 3, 2023	001-34207
10.39^	Supply Agreement, effective as of September 7, 2023, by and between Company and Nitto Denko Avecia Inc.	10.1	10-Q	November 2, 2023	001-34207
21.1	List of Subsidiaries					X
23.1	Consent of Independent Registered Public Accounting Firm					X
31.1	Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002					X
31.2	Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002					X

116

32.1*	Certification of Principal Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	X
32.2*	Certification of Principal Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	X
97.1+	Dynavax Technologies Corporation Incentive Compensation Recoupment Policy	X

EX—101.INS	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
EX—101.SCH	Inline XBRL Taxonomy Extension Schema With Embedded Linkbase Document
EX—104	The cover page for this Annual Report on Form 10-K has been formatted in Inline XBRL

† We have been granted confidential treatment with respect to certain portions of this agreement. Omitted portions have been filed separately with the Securities and Exchange Commission.

+ Indicates management contract, compensatory plan or arrangement.

^ Certain portions of this exhibit have been omitted as the Registrant has determined that (i) the omitted information is not material and (ii) the omitted information is of the type that the Registrant customarily and actually treats as private or confidential. The Registrant agrees to furnish supplementally an unredacted copy of any exhibit to the Securities and Exchange Commission upon request; provided, however, that the Registrant may request confidential treatment of omitted items.

* The certifications attached as Exhibits 32.1 and 32.2 that accompany this Annual Report on Form 10-K, are not deemed filed with the Securities and Exchange Commission and are not to be incorporated by reference into any filing of the Registrant 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 Form 10-K), irrespective of any general incorporation language contained in such filing.

ITEM 16. FORM 10-K SUMMARY

None.

117

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Emeryville, State of California.

Dynavax Technologies Corporation
By:	/s/ RYAN SPENCER
	Ryan Spencer Chief Executive Officer and Director (Principal Executive Officer)

Date: February 22, 2024

By:	/s/ KELLY MACDONALD
	Kelly MacDonald Chief Financial Officer (Principal Financial Officer)

Date: February 22, 2024

By:	/s/ JUSTIN BURGESS
	Justin Burgess Controller, Chief Accounting Officer (Principal Accounting Officer)

Date: February 22, 2024

118

Signature	Title	Date
/s/ RYAN SPENCER	Chief Executive Officer and Director	February 22, 2024
Ryan Spencer	(Principal Executive Officer)
/s/ KELLY MACDONALD	Chief Financial Officer	February 22, 2024
Kelly MacDonald	(Principal Financial Officer)
/s/ JUSTIN BURGESS	Controller, Chief Accounting Officer	February 22, 2024
Justin Burgess	(Principal Accounting Officer)
/s/ SCOTT MYERS	Chairman of the Board	February 22, 2024
Scott Myers
/s/ FRANCIS R. CANO	Director	February 22, 2024
Francis R. Cano, Ph.D.
/s/ JULIE EASTLAND	Director	February 22, 2024
Julie Eastland
/s/ DANIEL L. KISNER	Director	February 22, 2024
Daniel L. Kisner, M.D.
/s/ BRENT MACGREGOR	Director	February 22, 2024
Brent MacGregor
/s/ PETER R. PARADISO	Director	February 22, 2024
Peter R. Paradiso
/s/ PEGGY V. PHILLIPS	Director	February 22, 2024
Peggy V. Phillips
/s/ ELAINE D. SUN	Director	February 22, 2024
Elaine D. Sun

119

EX-21.1

Exhibit 21.1

List of Subsidiaries

Dynavax GmbH

Dynavax India LLP

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(1)Registration Statement (Form S-3ASR Nos. 333-239663, 333-241678, and 333-273674) of Dynavax Technologies Corporation and in the related Prospectuses, and

(2)Registration Statements (Form S-8 Nos. 333-211747, 333-221832, 333-225525, 333-218470, 333-204506, 333-197838, 333-190313, 333-171552, 333-233247, 333-241674, 333-258469,333-253515 and 333-265373) pertaining to the Amended and Restated 2011 Equity Incentive Plan, the Amended and Restated 2014 Employee Stock Purchase Plan, the 2017 Inducement Award Plan, the Amended and Restated 2018 Equity Incentive Plan and the 2021 Inducement Award Plan of Dynavax Technologies Corporation;

of our reports dated February 22, 2024, with respect to the consolidated financial statements of Dynavax Technologies Corporation and the effectiveness of internal control over financial reporting of Dynavax Technologies Corporation included in this Annual Report (Form 10-K) of Dynavax Technologies Corporation for the year ended December 31, 2023.

/s/ Ernst & Young LLP

San Francisco, California

February 22, 2024

EX-31.1

Exhibit 31.1

Rule 13a-14(a) Certification of Principal Executive Officer

CERTIFICATIONS

I, Ryan Spencer, certify that:

1.	I have reviewed this annual report on Form 10-K of Dynavax Technologies Corporation (the “registrant”);
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
4.	The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
	a)	designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
	b)	designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
	c)	evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
	d)	disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and
5.	The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):
	a)	all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and
	b)	any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

By:	/s/ RYAN SPENCER
	Ryan Spencer Chief Executive Officer and Director (Principal Executive Officer)

Date: February 22, 2024

EX-31.2

Exhibit 31.2

Rule 13a-14(a) Certification of Principal Financial Officer

CERTIFICATIONS

I, Kelly MacDonald, certify that:

1.	I have reviewed this annual report on Form 10-K of Dynavax Technologies Corporation (the “registrant”);
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
4.	The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
	a)	designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
	b)	designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
	c)	evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
	d)	disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and
5.	The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):
	a)	all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and
	b)	any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

By:	/s/ KELLY MACDONALD
	Kelly MacDonald Chief Financial Officer (Principal Financial Officer)

Date: February 22, 2024

EX-32.1

Exhibit 32.1

Certification Pursuant to Section 1350 of Chapter 63

of Title 18 of the United States Code

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §1350), I, Ryan Spencer, Chief Executive Officer of Dynavax Technologies Corporation (the “Company”), hereby certify that, to the best of my knowledge:

(i) The Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023, to which this Certification is attached as Exhibit 32.1 (the “Annual Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and

(ii) The information contained in the Annual Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

In Witness Whereof, the undersigned has set his hand hereto as of the 22nd day of February, 2024.

By:	/s/ RYAN SPENCER
	Ryan Spencer Chief Executive Officer and Director (Principal Executive Officer)

This certification accompanies the Form 10-K to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Dynavax Technologies Corporation 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 the Form 10-K), irrespective of any general incorporation language contained in such filing.

EX-32.2

Exhibit 32.2

Certification Pursuant to Section 1350 of Chapter 63

of Title 18 of the United States Code

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §1350), I, Kelly MacDonald, Chief Financial Officer of Dynavax Technologies Corporation (the “Company”), hereby certify that, to the best of my knowledge:

(i) The Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023, to which this Certification is attached as Exhibit 32.2 (the “Annual Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and

(ii) The information contained in the Annual Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

In Witness Whereof, the undersigned has set her hand hereto as of the 22nd day of February, 2024.

By:	/s/ KELLY MACDONALD
	Kelly MacDonald Chief Financial Officer  (Principal Financial Officer)

This certification accompanies the Form 10-K to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Dynavax Technologies Corporation 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 the Form 10-K), irrespective of any general incorporation language contained in such filing.

EX-97.1

Exhibit 97.1

Dynavax Technologies Corporation

Incentive Compensation Recoupment Policy

Effective November 23, 2023

1.Introduction

The Board of Directors (the “Board”) of Dynavax Technologies Corporation, a Delaware corporation (the “Company”), has determined, upon the recommendation of the Compensation Committee of the Board (the “Compensation Committee”), that it is in the best interests of the Company and its stockholders to adopt this Incentive Compensation Recoupment Policy (this “Policy”) providing for the Company’s recoupment of Recoverable Incentive Compensation that is received by Covered Officers of the Company under certain circumstances. Certain capitalized terms used in this Policy have the meanings given to such terms in Section 3 below.

This Policy is designed to comply with, and shall be interpreted to be consistent with, Section 10D of the Exchange Act, Rule 10D-1 promulgated thereunder (“Rule 10D-1”) and Nasdaq Listing Rule 5608 (the “Listing Standards”).

2.Effective Date

This Policy shall apply to all Incentive Compensation that is received by a Covered Officer on or after October 2, 2023 (the “Effective Date”). Incentive Compensation is deemed “received” in the Company’s fiscal period in which the Financial Reporting Measure specified in the Incentive Compensation award is attained, even if the payment or grant of such Incentive Compensation occurs after the end of that period.

3.Definitions

“Accounting Restatement” means an accounting restatement that the Company is required to prepare due to the material noncompliance of the Company with any financial reporting requirement under the securities laws, including any required accounting restatement to correct an error in previously issued financial statements that is material to the previously issued financial statements, or that would result in a material misstatement if the error were corrected in the current period or left uncorrected in the current period.

“Accounting Restatement Date” means the earlier to occur of (a) the date that the Board, a committee of the Board authorized to take such action, or the officer or officers of the Company authorized to take such action if Board action is not required, concludes, or reasonably should have concluded, that the Company is required to prepare an Accounting Restatement, or (b) the date that a court, regulator or other legally authorized body directs the Company to prepare an Accounting Restatement.

“Administrator” means the Compensation Committee or, in the absence of such committee, the Board.

“Code” means the U.S. Internal Revenue Code of 1986, as amended, and the regulations promulgated thereunder.

“Covered Officer” means each current and former Executive Officer.

“Exchange” means the Nasdaq Stock Market.

290542985 v4

“Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended.

“Executive Officer” means the Company’s president, principal financial officer, principal accounting officer (or if there is no such accounting officer, the controller), any vice-president of the Company in charge of a principal business unit, division, or function (such as sales, administration, or finance), any other officer who performs a policy-making function, or any other person who performs similar policy-making functions for the Company. Executive officers of the Company’s parent(s) or subsidiaries are deemed executive officers of the Company if they perform such policy-making functions for the Company. Policy-making function is not intended to include policy-making functions that are not significant. Identification of an executive officer for purposes of this Policy would include at a minimum executive officers identified pursuant to Item 401(b) of Regulation S-K promulgated under the Exchange Act.

“Financial Reporting Measures” means measures that are determined and presented in accordance with the accounting principles used in preparing the Company’s financial statements, and any measures derived wholly or in part from such measures, including Company stock price and total stockholder return (“TSR”). A measure need not be presented in the Company’s financial statements or included in a filing with the SEC in order to be a Financial Reporting Measure.

“Incentive Compensation” means any compensation that is granted, earned or vested based wholly or in part upon the attainment of a Financial Reporting Measure.

“Lookback Period” means the three completed fiscal years immediately preceding the Accounting Restatement Date, as well as any transition period (resulting from a change in the Company’s fiscal year) within or immediately following those three completed fiscal years (except that a transition period of at least nine months shall count as a completed fiscal year). Notwithstanding the foregoing, the Lookback Period shall not include fiscal years completed prior to the Effective Date.

“Recoverable Incentive Compensation” means Incentive Compensation received by a Covered Officer during the Lookback Period that exceeds the amount of Incentive Compensation that would have been received had such amount been determined based on the Accounting Restatement, computed without regard to any taxes paid (i.e., on a gross basis without regarding to tax withholdings and other deductions). For any compensation plans or programs that take into account Incentive Compensation, the amount of Recoverable Incentive Compensation for purposes of this Policy shall include, without limitation, the amount contributed to any notional account based on Recoverable Incentive Compensation and any earnings to date on that notional amount. For any Incentive Compensation that is based on stock price or TSR, where the Recoverable Incentive Compensation is not subject to mathematical recalculation directly from the information in an Accounting Restatement, the Administrator will determine the amount of Recoverable Incentive Compensation based on a reasonable estimate of the effect of the Accounting Restatement on the stock price or TSR upon which the Incentive Compensation was received. The Company shall maintain documentation of the determination of that reasonable estimate and provide such documentation to the Exchange in accordance with the Listing Standards.

“SEC” means the U.S. Securities and Exchange Commission.

4.Recoupment

(a)Applicability of Policy. This Policy applies to Incentive Compensation received by a Covered Officer (i) after beginning services as an Executive Officer, (ii) who served as an Executive Officer at any time during the performance period for such Incentive Compensation, (iii) while the Company had a class of securities listed on a national securities exchange or a national securities association, and (iv)

2

290542985 v4

during the Lookback Period.

(b)Recoupment Generally. Pursuant to the provisions of this Policy, if there is an Accounting Restatement, the Company must reasonably promptly recoup the full amount of the Recoverable Incentive Compensation, unless the conditions of one or more subsections of Section 4(c) of this Policy are met and the Compensation Committee, or, if such committee does not consist solely of independent directors, a majority of the independent directors serving on the Board, has made a determination that recoupment would be impracticable. Recoupment is required regardless of whether the Covered Officer engaged in any misconduct and regardless of fault, and the Company’s obligation to recoup Recoverable Incentive Compensation is not dependent on whether or when any restated financial statements are filed.

(c)Impracticability of Recovery. Recoupment may be determined to be impracticable if, and only if:

(i)the direct expense paid to a third party to assist in enforcing this Policy would exceed the amount of the applicable Recoverable Incentive Compensation; provided that, before concluding that it would be impracticable to recover any amount of Recoverable Incentive Compensation based on expense of enforcement, the Company shall make a reasonable attempt to recover such Recoverable Incentive Compensation, document such reasonable attempt(s) to recover, and provide that documentation to the Exchange in accordance with the Listing Standards; or

(ii)recoupment of the applicable Recoverable Incentive Compensation would likely cause an otherwise tax-qualified retirement plan, under which benefits are broadly available to employees of the Company, to fail to meet the requirements of Code Section 401(a)(13) or Code Section 411(a) and regulations thereunder.

(d)Sources of Recoupment. To the extent permitted by applicable law, the Administrator shall, in its sole discretion, determine the timing and method for recouping Recoverable Incentive Compensation hereunder, provided that such recoupment is undertaken reasonably promptly. The Administrator may, in its discretion, seek recoupment from a Covered Officer from any of the following sources or a combination thereof, whether the applicable compensation was approved, awarded, granted, payable or paid to the Covered Officer prior to, on or after the Effective Date: (i) direct repayment of Recoverable Incentive Compensation previously paid to the Covered Officer; (ii) cancelling prior cash or equity-based awards (whether vested or unvested and whether paid or unpaid); (iii) cancelling or offsetting against any planned future cash or equity-based awards; (iv) forfeiture of deferred compensation, subject to compliance with Code Section 409A; and (v) any other method authorized by applicable law or contract. Subject to compliance with any applicable law, the Administrator may effectuate recoupment under this Policy from any amount otherwise payable to the Covered Officer, including amounts payable to such individual under any otherwise applicable Company plan or program, e.g., base salary, bonuses or commissions and compensation previously deferred by the Covered Officer. The Administrator need not utilize the same method of recovery for all Covered Officers or with respect to all types of Recoverable Incentive Compensation.

(e)No Indemnification of Covered Officers. Notwithstanding any indemnification agreement, applicable insurance policy or any other agreement or provision of the Company’s certificate of incorporation or bylaws to the contrary, no Covered Officer shall be entitled to indemnification or advancement of expenses in connection with any enforcement of this Policy by the Company, including paying or reimbursing such Covered Officer for insurance premiums to cover potential obligations to the Company under this Policy.

3

290542985 v4

(f)Indemnification of Administrator. Any members of the Administrator, and any other members of the Board who assist in the administration of this Policy, shall not be personally liable for any action, determination or interpretation made with respect to this Policy and shall be indemnified by the Company to the fullest extent under applicable law and Company policy with respect to any such action, determination or interpretation. The foregoing sentence shall not limit any other rights to indemnification of the members of the Board under applicable law or Company policy.

(g)No “Good Reason” for Covered Officers. Any action by the Company to recoup or any recoupment of Recoverable Incentive Compensation under this Policy from a Covered Officer shall not be deemed (i) “good reason” for resignation or to serve as a basis for a claim of constructive termination under any benefits or compensation arrangement applicable to such Covered Officer, or (ii) to constitute a breach of a contract or other arrangement to which such Covered Officer is party.

5.Administration

Except as specifically set forth herein, this Policy shall be administered by the Administrator. The Administrator shall have full and final authority to make any and all determinations required under this Policy. Any determination by the Administrator with respect to this Policy shall be final, conclusive and binding on all interested parties and need not be uniform with respect to each individual covered by this Policy. In carrying out the administration of this Policy, the Administrator is authorized and directed to consult with the full Board or such other committees of the Board as may be necessary or appropriate as to matters within the scope of such other committee’s responsibility and authority. Subject to applicable law, the Administrator may authorize and empower any officer or employee of the Company to take any and all actions that the Administrator, in its sole discretion, deems necessary or appropriate to carry out the purpose and intent of this Policy (other than with respect to any recovery under this Policy involving such officer or employee).

6.Severability

If any provision of this Policy or the application of any such provision to a Covered Officer shall be adjudicated to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Policy, and the invalid, illegal or unenforceable provisions shall be deemed amended to the minimum extent necessary to render any such provision or application enforceable.

7.No Impairment of Other Remedies

Nothing contained in this Policy, and no recoupment or recovery as contemplated herein, shall limit any claims, damages or other legal remedies the Company or any of its affiliates may have against a Covered Officer arising out of or resulting from any actions or omissions by the Covered Officer. This Policy does not preclude the Company from taking any other action to enforce a Covered Officer’s obligations to the Company, including, without limitation, termination of employment and/or institution of civil proceedings. This Policy is in addition to the requirements of Section 304 of the Sarbanes-Oxley Act of 2002 (“SOX 304”) that are applicable to the Company’s Chief Executive Officer and Chief Financial Officer and to any other compensation recoupment policy and/or similar provisions in any employment, equity plan, equity award, or other individual agreement, to which the Company is a party or which the Company has adopted or may adopt and maintain from time to time; provided, however, that compensation recouped pursuant to this Policy shall not be duplicative of compensation recouped pursuant to SOX 304 or any such compensation recoupment policy and/or similar provisions in any such employment, equity plan, equity award, or other individual agreement except as may be required by law.

4

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8.Amendment; Termination

The Administrator may amend, terminate or replace this Policy or any portion of this Policy at any time and from time to time in its sole discretion. The Administrator shall amend this Policy as it deems necessary to comply with applicable law or any Listing Standard.

9.Successors

This Policy shall be binding and enforceable against all Covered Officers and, to the extent required by Rule 10D-1 and/or the applicable Listing Standards, their beneficiaries, heirs, executors, administrators or other legal representatives.

10. Required Filings

The Company shall make any disclosures and filings with respect to this Policy that are required by law, including as required by the SEC.

* * * * *

5

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Dynavax Technologies Corporation

Incentive Compensation Recoupment Policy

Form of Executive Acknowledgment

I, the undersigned, agree and acknowledge that I am bound by, and subject to, the Dynavax Technologies Corporation Incentive Compensation Recoupment Policy, as may be amended, restated, supplemented or otherwise modified from time to time (the “Policy”). In the event of any inconsistency between the Policy and the terms of any employment agreement, offer letter or other individual agreement with Dynavax Technologies Corporation (the “Company”) to which I am a party, or the terms of any compensation plan, program or agreement, whether or not written, under which any compensation has been granted, awarded, earned or paid to me, the terms of the Policy shall govern.

In the event that the Administrator (as defined in the Policy) determines that any compensation granted, awarded, earned or paid to me must be forfeited or reimbursed to the Company pursuant to the Policy, I will promptly take any action necessary to effectuate such forfeiture and/or reimbursement. I further agree and acknowledge that I am not entitled to indemnification, and hereby waive any right to advancement of expenses, in connection with any enforcement of the Policy by the Company.

Agreed and Acknowledged:

___________________________

Name: _____________________

Title: ______________________

Date: ______________________

290542985 v4

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Document and Entity Information - USD ($)
$ in Billions

12 Months Ended

Dec. 31, 2023

Feb. 20, 2024

Jun. 30, 2023

Cover [Abstract]

Document Type

10-K

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Document Period End Date

Dec. 31, 2023

Document Fiscal Year Focus

2023

Document Fiscal Period Focus

FY

Trading Symbol

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Entity Registrant Name

Dynavax Technologies Corp

Entity Central Index Key

0001029142

Current Fiscal Year End Date

--12-31

Entity Well-known Seasoned Issuer

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Entity Current Reporting Status

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Entity Voluntary Filers

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Entity Filer Category

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Entity Small Business

false

Entity Emerging Growth Company

false

Entity Shell Company

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Entity Common Stock, Shares Outstanding

130,614,772

Entity Public Float

$ 0.9

Title of 12(b) Security

Common Stock, $0.001 par value

Security Exchange Name

NASDAQ

Entity File Number

001-34207

Entity Incorporation, State or Country Code

DE

Entity Tax Identification Number

33-0728374

Entity Address, Address Line One

2100 Powell Street

Entity Address, Address Line Two

Suite 720

Entity Address, City or Town

Emeryville

Entity Address, State or Province

CA

Entity Address, Postal Zip Code

94608

City Area Code

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Local Phone Number

848-5100

Document Annual Report

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Document Transition Report

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Entity Interactive Data Current

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ICFR Auditor Attestation Flag

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Documents Incorporated by Reference

Portions of the Definitive Proxy Statement for the registrant’s 2024 Annual Meeting of Stockholders are incorporated by reference into Part III, Items 10-14 of this Form 10-K. The Definitive Proxy Statement will be filed no later than 120 days after the close of the registrant’s fiscal year ended December 31, 2023.

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Auditor Name

Ernst & Young LLP

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XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 150,279	$ 202,004
Marketable securities available-for-sale	592,023	422,391
Accounts receivables, net of allowance for doubtful accounts of $12,313 and $0 at December 31, 2023 and December 31, 2022, respectively	40,607	145,130
Other receivables	3,926	2,385
Inventories	53,290	59,446
Prepaid expenses and other current assets	18,995	85,629
Total current assets	859,120	916,985
Property and equipment, net	37,297	37,596
Operating lease right-of-use assets	24,287	25,745
Goodwill	2,067	2,006
Other assets (Note 9 )	74,325	3,518
Total assets	997,096	985,850
Current liabilities:
Accounts payable	5,245	3,211
Accrued research and development	2,982	4,775
CEPI accrual (Note 9)	0	107,738
Accrued liabilities (Note 7)	49,448	30,719
Other current liabilities	4,520	3,631
Total current liabilities	62,195	150,074
Convertible Notes, net of debt discount of $2,802 and $3,922 at December 31, 2023 and December 31, 2022, respectively (Note 10)	222,698	221,578
Long-term portion of lease liabilities	29,720	32,801
CEPI accrual long-term (Note 9)	60,337	0
Other long-term liabilities	74	384
Total liabilities	375,024	404,837
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock: $0.001 par value, 5,000 shares authorized at December 31, 2023, and 2022; zero shares outstanding at December 31, 2023 and 2022	0	0
Common stock: $0.001 par value; 278,000 shares authorized at December 31, 2023, and 2022; 129,530 shares and 127,604 shares issued and outstanding at December 31, 2023 and 2022, respectively	130	128
Additional paid-in capital	1,554,634	1,510,518
Accumulated other comprehensive loss	(2,108)	(5,438)
Accumulated deficit	(930,584)	(924,195)
Total stockholders’ equity	622,072	581,013
Total liabilities and stockholders’ equity	$ 997,096	$ 985,850

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivables	$ 12,313	$ 0
Debt instrument, debt discount	$ 2,802	$ 3,922
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	278,000,000	278,000,000
Common stock, shares issued	129,530,000	127,604,000
Common stock, shares outstanding	129,530,228	127,604,000

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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Total revenues	$ 232,284	$ 722,683	$ 439,442
Operating expenses:
Cost of sales - product	50,167	262,153	173,572
Research and development	54,886	46,600	32,228
Selling, general and administrative	152,946	131,408	100,156
Gain on sale of assets (Note 8)	(1,000)	(1,000)	(1,000)
Bad debt expense (Note 9)	12,313	0	0
Total operating expenses	269,312	439,161	304,956
(Loss) income from operations	(37,028)	283,522	134,486
Other (expense) income:
Interest income	31,993	7,912	140
Interest expense	(6,757)	(6,732)	(11,176)
Sublease income	7,577	7,685	7,735
Loss on debt extinguishment (Note 11)	0	0	(5,232)
Change in fair value of warrant liability (Note 14)	0	1,801	(49,354)
Other	(152)	111	922
Net (loss) income before income taxes, Total	(4,367)	294,299	77,521
Provision for income taxes	(2,022)	(1,143)	(808)
Net (loss) income	(6,389)	293,156	76,713
Undistributed earnings allocated to participating securities	0	(283)	(4,569)
Net (loss) income allocable to common stockholders, basic	$ (6,389)	$ 292,873	$ 72,144
Basic net (loss) income per share allocable to common stockholders	$ (0.05)	$ 2.32	$ 0.62
Diluted net (loss) income per share allocable to common stockholders	$ (0.05)	$ 1.97	$ 0.57
Weighted-average shares used in computing basic net (loss) income per share allocable to common stockholders	128,733	126,398	116,264
Weighted-average shares used in computing diluted net (loss) income per share allocable to common stockholders	128,733	150,797	133,006
Product
Revenues:
Total revenues	$ 213,295	$ 713,645	$ 437,099
Other Revenue
Revenues:
Total revenues	$ 18,989	$ 9,038	$ 2,343

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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (6,389)	$ 293,156	$ 76,713
Other comprehensive income (loss), net of tax:
Change in unrealized loss on marketable securities available-for-sale	2,251	(1,407)	(30)
Cumulative foreign currency translation adjustments	1,079	(1,765)	(2,509)
Total other comprehensive income (loss)	3,330	(3,172)	(2,539)
Total comprehensive (loss) income	$ (3,059)	$ 289,984	$ 74,174

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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Preferred Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
Beginning Balances at Dec. 31, 2020	$ 58,693	$ 110	$ 0	$ 1,352,374	$ 273	$ (1,294,064)
Beginning Balances (in shares) at Dec. 31, 2020		110,190,000	4,000
Conversion of Preferred Stock		$ 4	$ 0	(4)
Stock Issued During Period, Shares, Conversion of Convertible Securities		4,140,000	(4,000)
Issuance of common stock upon exercise of stock options		1,035,000
Issuance of common stock upon release of restricted stock awards		525,000
Issuance Of Common Stock Upon Release Of Restricted Stock Awards	(107)			(107)
Issuance of common stock upon exercise of stock options	6,684	$ 2		6,682
Issuance of common stock, net of issuance costs, in conjunction with an underwritten public offering and an At Market Sales Agreement (Shares)		2,879,000
Issuance of common stock, net of issuance costs, in conjunction with an underwritten public offering and an At Market Sales Agreement	28,156	$ 3	$ 0	28,153
Issuance of common stock under Employee Stock Purchase Plan	841			841
Issuance of common stock under Employee Stock Purchase Plan (in shares)		217,000
Issuance of common stock upon exercise of warrants (Shares)		3,959,000
Issuance of common stock upon exercise of warrants	59,888	$ 4	0	59,884
Issuance of capped call options (see Note 10)	(27,240)			(27,240)
Stock compensation expense	21,285			21,285
Total other comprehensive income (loss)	(2,539)				(2,539)
Net (loss) income	76,713					76,713
Ending Balances at Dec. 31, 2021	222,374	$ 123	0	1,441,868	(2,266)	(1,217,351)
Ending Balances (in shares) at Dec. 31, 2021		122,945,000
Issuance of common stock upon exercise of stock options		1,194,000
Issuance of common stock upon release of restricted stock awards		1,432,000
Issuance Of Common Stock Upon Release Of Restricted Stock Awards		$ 1		(1)
Issuance of common stock upon exercise of stock options	9,640	$ 2	0	9,638
Issuance of common stock under Employee Stock Purchase Plan	1,430			1,430
Issuance of common stock under Employee Stock Purchase Plan (in shares)		154,000
Issuance of common stock upon exercise of warrants (Shares)		1,879,000
Issuance of common stock upon exercise of warrants	24,670	$ 2	0	24,668
Stock compensation expense	32,915			32,915
Total other comprehensive income (loss)	(3,172)				(3,172)
Net (loss) income	293,156					293,156
Ending Balances at Dec. 31, 2022	581,013	$ 128	0	1,510,518	(5,438)	(924,195)
Ending Balances (in shares) at Dec. 31, 2022		127,604,000
Issuance of common stock upon exercise of stock options		850,000
Issuance of common stock upon exercise of stock options	6,361	$ 1	0	6,360
Issuance of common stock upon release of restricted stock awards		915,000
Issuance of common stock upon release of restricted stock awards, net of statutory tax withholdings	(6,370)	$ 1		(6,371)
Issuance of common stock under Employee Stock Purchase Plan	1,535			1,535
Issuance of common stock under Employee Stock Purchase Plan (in shares)		161,000
Stock compensation expense	42,592			42,592
Total other comprehensive income (loss)	3,330				3,330
Net (loss) income	(6,389)					(6,389)
Ending Balances at Dec. 31, 2023	$ 622,072	$ 130	$ 0	$ 1,554,634	$ (2,108)	$ (930,584)
Ending Balances (in shares) at Dec. 31, 2023		129,530,000

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net (loss) income	$ (6,389)	$ 293,156	$ 76,713
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	4,342	3,812	4,296
Amortization of right-of-use assets	2,934	2,856	2,762
Inventory write-off	0	34,288	2,588
Amortization of premiums (accretion of discounts) on marketable securities	(16,555)	(4,181)	470
Loss on debt extinguishment	0	0	5,232
Change in fair value of warrant liability	0	(1,801)	49,354
Stock-based compensation expense	42,592	32,915	21,285
Non-cash interest expense	1,120	1,088	1,608
Gain on sale of assets	(1,000)	(1,000)	(1,000)
Bad debt expense (Note 9)	12,313	0	0
Changes in operating assets and liabilities:
Accounts and other receivables, net	43,268	(15,699)	(109,155)
Inventories, net	3,909	(32,399)	(234)
Prepaid manufacturing	0	159,655	(130,232)
Prepaid expenses and other current assets	(4,673)	(11,865)	(64,558)
Other assets	570	87	175
Accounts payable	1,952	691	(767)
CEPI accrual (Note 9)	0	(21,110)	128,848
Lease liabilities	(3,629)	(3,125)	(3,234)
Deferred revenue	0	(349,864)	311,652
Accrued and other liabilities	19,809	(24,788)	39,725
Net cash provided by operating activities	100,563	62,716	335,528
Investing activities
Purchases of marketable securities	(636,921)	(632,306)	(164,928)
Proceeds from maturities and redemptions of marketable securities	486,097	322,450	187,630
Purchases of property and equipment, net	(4,104)	(7,139)	(9,477)
Proceeds from sale of assets, net of transaction costs	1,000	1,000	1,000
Net cash (used in) provided by investing activities	(153,928)	(315,995)	14,225
Financing activities
Proceeds from issuances of common stock, net	0	0	28,156
Proceeds from issuance of Convertible Notes, net	0	0	219,822
Purchases of capped call options	0	0	(27,240)
Repayment of long-term debt	0	0	(190,194)
Proceeds from warrants exercises	0	8,455	17,814
Proceeds from exercise of stock options and release of restricted stock awards, net	6,360	9,639	6,577
Proceeds from Employee Stock Purchase Plan	1,535	1,431	841
Payments for taxes related to net share settlement of RSUs	(6,509)	0	0
Net cash provided by financing activities	1,386	19,525	55,776
Effect of exchange rate changes on cash and cash equivalents, and restricted cash	324	(443)	(1,431)
Net increase (decrease) in cash and cash equivalents, and restricted cash	(51,655)	(234,197)	404,098
Cash and cash equivalents, and restricted cash at beginning of year	202,211	436,408	32,310
Cash and cash equivalents, and restricted cash at end of year	150,556	202,211	436,408
Supplemental disclosure of cash flow information
Cash paid during the year for income taxes	2,014	2,208	1,312
Cash paid during the year for interest	5,638	5,638	9,815
Reclassification of contract asset from other current assets to other assets	71,307	0	0
Reclassification of CEPI accrual to CEPI accrual long-term	(60,337)	0	0
Advance Payments forgiven per CEPI-Bio E Assignment Agreement (Note 9)	(47,401)	0	0
Non-cash investing and financing activities:
Purchases of property and equipment, not yet paid	299	1,015	591
Right-of-use assets obtained in exchange for operating lease liabilities	$ 1,332	$ 2,848	$ 2,468

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Organization

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

1.Organization

Dynavax Technologies Corporation (“we,” “our,” “us,” “Dynavax” or the “Company”) is a commercial stage biopharmaceutical company developing and commercializing innovative vaccines to help protect the world against infectious diseases. Our first marketed product, HEPLISAV-B® [Hepatitis B Vaccine (Recombinant), Adjuvanted] is approved in the United States, the European Union and Great Britain for the prevention of infection caused by all known subtypes of hepatitis B virus in adults aged 18 years and older. In May 2022, we commenced commercial shipments of HEPLISAV-B in Germany.

We are advancing a pipeline of differentiated product candidates that leverage our CpG 1018® adjuvant, the adjuvant used in HEPLISAV-B, to develop improved vaccines in indications with unmet medical needs. These programs include vaccine candidates under development for shingles and Tdap, and a plague vaccine candidate program in collaboration with and fully funded by the U.S. Department of Defense ("DoD").

Additionally. we manufacture and have supplied in the past CpG 1018 adjuvant, the adjuvant used in HEPLISAV-B, through both commercial supply agreements, and through preclinical and clinical research collaborations with third-party organizations. As of December 31, 2022, we had satisfied all delivery obligations under our commercial supply agreements.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2.Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include our accounts and those of our wholly-owned subsidiaries, Dynavax GmbH located in Düsseldorf, Germany, Dynavax India LLP in India and a branch of Dynavax in Italy. All intercompany accounts and transactions among the entities have been eliminated from the consolidated financial statements.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make informed estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Management’s estimates are based on historical information available as of the date of the consolidated financial statements and various other assumptions we believe are reasonable under the circumstances. Actual results may differ materially from these estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known.

Foreign Currency Translation

We consider the local currency to be the functional currency for our international subsidiaries, Dynavax GmbH, located in Düsseldorf, Germany, Dynavax India LLP, and a branch of Dynavax registered in Italy. Accordingly, assets and liabilities denominated in this foreign currency are translated into U.S. dollars using the exchange rate in effect on the balance sheet date. Revenues and expenses are translated at average exchange rates prevailing during the year. Currency translation adjustments arising from period to period are charged or credited to accumulated other comprehensive income (loss) in stockholders’ equity.

As of December 31, 2023 and 2022, the cumulative translation adjustments balance was $(3.0) million and $(4.0) million, respectively, primarily related to the translation of Dynavax GmbH assets, liabilities and operating results from Euros to U.S. dollars. For the years ended December 31, 2023, 2022 and 2021, we reported an unrealized foreign currency translation gain (loss) of $1.1 million, $(1.8) million and $(2.5) million, respectively. Realized gains and losses resulting from currency transactions are included in other (expense) income in the consolidated statements of operations. For the years ended December 31, 2023, 2022 and 2021, we reported a (loss) gain of $(0.1) million, $0.1 million and $0.9 million, respectively, resulting from currency transactions in our consolidated statements of operations.

Segment Information

Operating segments are defined as components of an entity for which discrete financial information is available that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual

segment and in assessing performance. Our Chief Executive Officer is the CODM. The CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, management has determined that we operate in one operating segment that is focused on the discovery, development, and commercialization of innovative vaccines. Net assets outside of the U.S. were less than 10% of total net assets as of December 31, 2023 and 2022.

Cash and Cash Equivalents and Marketable Securities

We consider all liquid investments purchased with an original maturity of three months or less and that can be liquidated without prior notice or penalty to be cash equivalents. Management determines the appropriate classification of marketable securities at the time of purchase. In accordance with our investment policy, we invest in short-term money market funds, U.S. treasuries, U.S. government agency securities and corporate debt securities. We believe these types of investments are subject to minimal credit and market risk.

We have classified our entire investment portfolio as available-for-sale and available for use in current operations and accordingly have classified all investments as short-term. Available-for-sale securities are carried at fair value based on inputs that are observable, either directly or indirectly, such as quoted market prices for similar securities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the securities, with unrealized gains and losses included in accumulated other comprehensive loss in stockholders’ equity. Commencing with our adoption of (“ASC”) 326, Financial Instruments — Credit Losses (“ASC 326") on January 1, 2023, we determine whether a decline in the fair value of our available-for-sale ("AFS") debt securities below their amortized cost basis (i.e., an impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in other comprehensive income (loss), net of applicable taxes. Credit-related impairments (if any) are recognized as an allowance on the balance sheet with a corresponding adjustment to earnings. Both the allowance and the adjustment to net income can be reversed if conditions change. To date, there have been no declines in fair value that have been identified as a credit-related impairment.

Concentration of Credit Risk and Other Risks and Uncertainties

Financial instruments that are subject to concentration of credit risk consist primarily of cash equivalents, marketable securities and accounts receivable.

Our policy is to invest cash in institutional money market funds and marketable securities of the U.S. government and corporate issuers with high credit quality to limit the amount of credit exposure. We currently maintain a portfolio of cash equivalents and marketable securities in a variety of securities, including short-term money market funds, U.S. treasuries, U.S. government agency securities and corporate debt securities. We have not experienced any significant losses on our cash equivalents and marketable securities.

Our accounts receivable balance consists, primarily, of amounts due from product sales. Accounts receivable are recorded net of reserves for chargebacks, distribution fees, trade discounts and doubtful accounts. We estimate our allowance for doubtful accounts based on an evaluation of the aging of our receivables. Accounts receivable balances are written off against the allowance when it is probable that the receivable will not be collected. During the year ended December 31, 2023, we recorded an allowance for doubtful accounts of $12.3 million, which was determined by assessing changes in Biological E. Limited's (“Bio E”) credit risk, contemplation of ongoing negotiations relating to Bio E Amendment No. 3 (See Note 9), and Bio E's dependence on cash collections from the Government of India, which have been delayed and significantly reduced in connection with the overall reduction in demand for CORBEVAX from the Government of India. As of December 31, 2023 and 2022, three customers collectively represented approximately 81% and 78% of our HEPLISAV-B trade receivable balance, respectively. As of December 31, 2023, we had no CpG 1018 adjuvant trade receivable balance. As of December 31, 2022, one customer represented approximately 100% of our CpG 1018 adjuvant trade receivable balance.

Our product candidates will require approval from the United States Food and Drug Administration ("FDA") and foreign regulatory agencies before commercial sales can commence. There can be no assurance that our product candidates will receive any of these required approvals. The denial or delay of such approvals may have a material adverse impact on our business and may impact our business in the future. In addition, after the approval of HEPLISAV-B by the FDA, there is still an ongoing risk of adverse events that did not appear during the drug approval process that could affect our authorizations in the future.

We are subject to risks common to companies in the biopharmaceutical industry, including, but not limited to, new technological innovations, clinical development risk, establishment of appropriate commercial partnerships, protection of proprietary technology, compliance with government and environmental regulations, uncertainty of market acceptance of product candidates, product liability, the volatility of our stock price and the need to obtain additional financing.

Our long-lived assets located in the United States as of December 31, 2023 and 2022, represented 31% and 34% of our total assets, respectively, and the remaining long-lived assets were located in Germany.

Inventories

HEPLISAV-B Inventories

Inventory is stated at the lower of cost or estimated net realizable value, on a first-in, first-out, or FIFO, basis. We primarily use actual costs to determine our cost basis for inventories. Our assessment of market value requires the use of estimates regarding the net realizable value of our inventory balances, including an assessment of excess or obsolete inventory. We determine excess or obsolete inventory based on multiple factors, including an estimate of the future demand for our products, product expiration dates and current sales levels. Our assumptions of future demand for our products are inherently uncertain and if we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of inventory reserves that we report in a particular period. For the years ended December 31, 2023 and 2022, there were no inventory reserves or write-offs recognized.

We consider regulatory approval of product candidates to be uncertain and product manufactured prior to the required regulatory approval may not be sold unless regulatory approval is obtained. As such, the manufacturing costs for product candidates incurred prior to regulatory approval are not capitalized as inventory. Instead, those are expensed as research and development costs. We begin capitalization of these inventory related costs once regulatory approval is obtained.

CpG 1018 Adjuvant Inventories

Inventory is stated at the lower of cost or estimated net realizable value, on a first-in, first-out, or FIFO, basis. We primarily use actual costs to determine our cost basis for inventories. Our assessment of market value requires the use of estimates regarding the net realizable value of our inventory balances, including an assessment of excess or obsolete inventory. We determine excess or obsolete inventory based on multiple factors, including an estimate of the future demand for our products, product expiration dates and current sales levels. Our assumptions of future demand for our products are inherently uncertain and if we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of inventory reserves that we report in a particular period. For the year ended December 31, 2023, there was no remaining CpG 1018 adjuvant inventory balance. For the year ended December 31, 2022, we recorded $34.3 million of inventory write-off to cost of sales - product, in connection with cancelled orders and the reduction in demand for CpG 1018 adjuvant reflected in the Clover Supply Agreement, as amended (See Note 9).

Long-Lived Assets

Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets. Additions, major renewals and improvements are capitalized, while repair and maintenance costs are charged to expense as incurred. Leasehold improvements are amortized over the remaining life of the initial lease term or the estimated useful lives of the assets, whichever is shorter.

We evaluate the carrying value of long-lived assets, whenever events or changes in business circumstances or our planned use of long-lived assets indicate, based on undiscounted future operating cash flows, that their carrying amounts may not be fully recoverable or that their useful lives are no longer appropriate. When an indicator of impairment exists, undiscounted future operating cash flows of long-lived assets are compared to their respective carrying value. If the carrying value is greater than the undiscounted future operating cash flows of long-lived assets, the long-lived assets are written down to their respective fair values and an impairment loss is recorded. Fair value is determined primarily using the discounted cash flows expected to be generated from the use of assets. Significant management judgment is required in the forecast of future operating results that are used in the preparation of expected cash flows. There have been no material adjustments to these estimates during the years presented.

Leases

We determine if an arrangement is or contains a lease at inception by assessing whether the arrangement contains an identified asset, and whether we have the right to control the identified asset. Operating leases are included in operating lease right-of-use (“ROU”) assets, other current liabilities and long-term portion of lease liabilities in our consolidated balance sheets. ROU assets represent our right to use an underlying asset for the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. The classification of our leases as operating or finance leases along with the initial measurement and recognition of the associated ROU assets and lease liabilities is performed at the lease commencement date. The measurement of ROU assets and lease liabilities is based on the present value of future lease payments over the lease term. The ROU asset also includes the effect of any lease payments made prior to or on lease commencement and excludes lease incentives and initial direct costs incurred, as applicable.

As the implicit rate in our leases is generally unknown, we use our incremental borrowing rate based on information available at the lease commencement date in determining the present value of future lease payments. We consider our credit risk, term of the lease, total lease payments and adjust for the impacts of collateral, as necessary, when calculating our incremental borrowing rate. The lease terms may include options to extend or terminate the lease when it is reasonably certain we will exercise any such options. Rent expense for our operating leases is recognized on a straight-line basis over the lease term. Variable lease payments are recorded as an expense in the period incurred.

We have elected not to apply the recognition requirements of Accounting Standards Codification ASC 842, Leases ("ASC 842"), for short-term leases. We have also elected the practical expedient to not separate lease components from non-lease components.

As lessors, we determine if an arrangement includes a lease at inception. We elected the practical expedient to not separate lease components from non-lease components. Sublease income is recognized on a straight-line basis over the expected lease term and is included in other income (expense) in our consolidated statements of operations.

Goodwill

Goodwill represents the excess purchase price over the fair value of tangible and intangible assets acquired and liabilities assumed. Our goodwill balance relates to our acquisition of Dynavax GmbH in 2006. Goodwill is not amortized, but instead is reviewed for impairment test at least annually, or more frequently if events occur or circumstances change that would indicate the carrying amount may be impaired. Goodwill is assigned to, and impairment testing is performed at, the reporting unit level. We determined that we have only one operating segment and there are no components of that operating segment that are deemed to be separate reporting units, such that we have one reporting unit for purposes of our goodwill impairment testing. No impairment has been identified for the years presented.

Convertible Notes

We account for our 2.50% convertible senior notes due in 2026 (“Convertible Notes”), as a long-term liability equal to the proceeds received from issuance, including the embedded conversion feature, net of the unamortized debt issuance and offering costs on the consolidated balance sheets (See Note 10). We evaluate all conversion, repurchase and redemption features contained in a debt instrument to determine if there are any embedded features that require bifurcation as a derivative. The conversion feature is not required to be accounted for separately as an embedded derivative. We amortize debt issuance and offering costs over the contractual term of the Convertible Notes, using the effective interest method, as interest expense on the consolidated statements of operations.

Capped Calls

We evaluate financial instruments under ASC 815, Derivatives and Hedging ("ASC 815"). The capped calls purchased in connection with the Convertible Notes financing ("Capped Calls") cover the same number of shares of common stock that initially underlie the Convertible Notes (subject to anti-dilution and certain other adjustments). The Capped Calls meet the definition of derivative under ASC 815. In addition, the Capped Calls meet the conditions in ASC 815 to be classified in stockholders’ equity and are not subsequently remeasured as long as the conditions for the equity classification continue to be met.

Revenue Recognition

We recognize revenue when the customer obtains control of promised goods or services, in an amount that reflects the consideration, which we expect to receive in exchange for those goods or services. To determine revenue recognition for arrangements that we determine are within the scope of ASC 606, Revenue from Contracts with Customers ("ASC 606"), we apply the following five step model:

•identify the contract(s) with a customer;

•identify the performance obligation(s) in the contract;

•determine the transaction price;

•allocate the transaction price to the performance obligation(s) in the contract; and

•recognize revenue when (or as) we satisfy a performance obligation.

Product Revenue, Net – HEPLISAV-B

We sell HEPLISAV-B to a limited number of wholesalers and specialty distributors in the U.S. (collectively, our “Customers”).

Revenues from product sales are recognized when we have satisfied our performance obligation, which is the transfer of control of our product upon delivery to the Customer. The timing between the recognition of revenue for product sales and the receipt of payment is not significant. Because our standard credit terms are short-term and we expect to receive payment in less than one-year, there is no significant financing component on the related receivables. Taxes collected from Customers relating to product sales and remitted to governmental authorities are excluded from revenues. Since our performance obligation is part of a contract that has an original expected duration of one year or less, we elect not to disclose the information about our remaining performance obligations.

Overall, product revenue, net - HEPLISAV-B, reflects our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of variable consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment.

Reserves for Variable Consideration

Revenues from product sales are recorded at the net sales price, which includes estimates of variable consideration such as product returns, chargebacks, discounts, rebates and other fees that are offered within contracts between us and our Customers, healthcare providers, pharmacies and others relating to our product sales. We estimate variable consideration using either the most likely amount method or the expected value method, depending on the type of variable consideration and what method better predicts the amount of consideration we expect to receive. We take into consideration relevant factors such as industry data, current contractual terms, available information about Customers’ inventory, resale and chargeback data and forecasted customer buying and payment patterns, in estimating each variable consideration. The variable consideration is recorded at the time product sales is recognized, resulting in a reduction in product revenue and a reduction in accounts receivable (if the Customer offsets the amount against its accounts receivable) or as an accrued liability (if we pay the amount through our accounts payable process). Variable consideration requires significant estimates, judgment and information obtained from external sources. The amount of variable consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment. If we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of revenue that we report in a particular period. We evaluate our estimates of variable considerations including, but not limited to, product returns, chargebacks and rebates, periodically or when there is an event or change in circumstances that may indicate that our estimates may change.

Product Returns: Consistent with industry practice, we offer our Customers a limited right of return based on the product’s expiration date for product that has been purchased from us. We estimate the amount of our product sales that may be returned by our Customers and record this estimate as a reduction of revenue in the period the related product revenue is recognized. We consider several factors in the estimation of potential product returns including expiration dates of the product shipped, the limited product return rights, available information about Customers’ inventory and other relevant factors.

Chargebacks: Our Customers subsequently resell our product to healthcare providers, pharmacies and others. In addition to distribution agreements with Customers, we enter into arrangements with qualified healthcare providers that provide for chargebacks and discounts with respect to the purchase of our product. Chargebacks represent the estimated obligations resulting from contractual commitments to sell product to qualified healthcare providers at prices lower than the list prices charged to Customers who directly purchase the product from us. Customers charge us for the difference between what they pay for the product and the ultimate selling price to the qualified healthcare providers. These reserves are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue and accounts receivable. Chargeback amounts are determined at the time of resale to the qualified healthcare providers by Customers, and we issue credits for such amounts generally within a few weeks of the Customer’s notification to us of the resale. Reserves for chargebacks consists of credits that we expect to issue for units that remain in the distribution channel inventories at each reporting period end that we expect will be sold to the qualified healthcare providers, and chargebacks for units that our Customers have sold to the qualified healthcare providers, but for which credits have not been issued.

Trade Discounts and Allowances: We provide our Customers with discounts which include early payment incentives that are explicitly stated in our contracts, and are recorded as a reduction of revenue in the period the related product revenue is recognized.

Distribution Fees: Distribution fees include fees paid to certain Customers for sales order management, data and distribution services. Distribution fees are recorded as a reduction of revenue in the period the related product revenue is recognized.

Rebates: Under certain contracts, Customers may obtain rebates for purchasing minimum volumes of our product. We estimate these rebates based upon the expected purchases and the contractual rebate rate and record this estimate as a reduction in revenue in the period the related revenue is recognized.

Product Revenue, Net – CpG 1018 Adjuvant

We also sell our innovative adjuvant, CpG 1018 adjuvant, to our collaboration partners for use in their development and/or commercialization of COVID-19 vaccine. We have determined that our collaboration partners meet the definition of Customers under ASC 606. Therefore, we accounted for our CpG 1018 adjuvant sales under ASC 606. Revenues from product sales are recognized when we have satisfied our performance obligation, which is the transfer of control of our product to the customer. Because the timing between the recognition of revenue for product sales and the receipt of payment is less than one year, there is no significant financing component on the related receivables. Since our performance obligation is part of a contract that has an original expected duration of one year or less, we elect not to disclose the information about our remaining performance obligations.

Overall, product revenue, net - CpG 1018 adjuvant, reflects our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment. Our CpG 1018 adjuvant customers have purchased a significant quantity of CpG 1018 adjuvant as part of their initial COVID-19 vaccine development inventory. Accordingly, we did not recognize CpG 1018 adjuvant net product revenue during the year ended December 31, 2023.

Other Revenue

Other revenue includes revenue from our agreement with the DoD, collaboration and manufacturing service revenue. We have entered into grant agreements, collaborative arrangements and arrangements to provide manufacturing services to other companies. Such arrangements may include promises to customers which, if capable of being distinct, are accounted for as separate performance obligations. For agreements with multiple performance obligations, we allocate estimated revenue to each performance obligation at contract inception based on the estimated transaction price of each performance obligation. Revenue allocated to each performance obligation is then recognized when we satisfy the performance obligation by transferring control of the promised good or service to the customer.

Research and Development Expenses and Accruals

Research and development expenses include personnel and facility-related expenses, outside contracted services including clinical trial costs, manufacturing and process development costs, research costs and other consulting services and

non-cash stock-based compensation. Research and development costs are expensed as incurred. Amounts due under contracts with third parties may be either fixed fee or fee for service, and may include upfront payments, monthly payments and payments upon the completion of milestones or receipt of deliverables. Non-refundable advance payments under agreements are capitalized and expensed as the related goods are delivered or services are performed.

We contract with third parties to perform various clinical trial activities in the on-going development of potential products. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows to our vendors. Payments under the contracts depend on factors such as the achievement of certain events, successful enrollment of patients, and completion of portions of the clinical trial or similar conditions. Our accrual for clinical trials is based on estimates of the services received and efforts expended pursuant to contracts with clinical trial centers and clinical research organizations. We may terminate these contracts upon written notice and we are generally only liable for actual effort expended by the organizations to the date of termination, although in certain instances we may be further responsible for termination fees and penalties. We estimate research and development expenses and the related accrual as of each balance sheet date based on the facts and circumstances known to us at that time. There have been no material adjustments to the prior period accrued estimates for clinical trial activities during the years presented.

Stock-Based Compensation

Stock-based compensation expense for restricted stock units ("RSUs"), market-based performance stock units ("PSUs") and stock options is estimated at the grant date based on the award’s estimated fair value.

For awards that vest based on service conditions and market conditions, we use a straight-line method to recognize compensation expense over the award’s requisite service period, assuming estimated forfeiture rates. For awards that contain performance conditions, we determine the appropriate amount to expense at each reporting date based on the anticipated achievement of performance targets, which requires judgement, including forecasting the achievement of future specified targets. At the date performance conditions are determined to be probable of achievement, we record a cumulative expense catch-up, with remaining expense amortized over the remaining service period. Throughout the performance period, we re-assesses the estimated performance and updates the number of performance-based awards that we believe will ultimately vest.

Fair value of RSUs is determined at the date of grant using our closing stock price, with the exception of PSUs, which are measured using the Monte Carlo simulation method on the date of grant. Our determination of the fair value of stock options on the date of grant using an option-pricing model is affected by our stock price, as well as assumptions regarding a number of subjective variables. We selected the Black-Scholes option pricing model as the most appropriate method for determining the estimated fair value-based measurement of our stock options. The Black-Scholes model requires the use of subjective assumptions, which determine the fair value-based measurement of stock options. These assumptions include, but are not limited to, our expected stock price volatility over the term of the awards, and projected employee stock option exercise behaviors. In the future, as additional empirical evidence regarding these input estimates becomes available, we may change or refine our approach of deriving these input estimates. These changes could impact our fair value of stock options granted in the future. Changes in the fair value of stock awards could materially impact our operating results.

Our current estimate of volatility is based on the historical volatility of our stock price. To the extent volatility in our stock price increases in the future, our estimates of the fair value of options granted in the future could increase, thereby increasing stock-based compensation expense recognized in future periods. We derive the expected term assumption primarily based on our historical settlement experience, while considering options that have not yet completed a full life cycle. Stock-based compensation expense is recognized only for awards ultimately expected to vest. Our estimate of the forfeiture rate is based primarily on our historical experience. To the extent we revise this estimate in the future, our share-based compensation expense could be materially impacted in the period of revision. There have been no material adjustments to these estimates during the years presented.

Income Taxes

The asset and liability approach is used to recognize deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities. Tax law and rate changes are reflected in income in the period such changes are enacted. We include interest and penalties related to income taxes, including unrecognized tax benefits, within income tax expense.

Our income tax returns are based on calculations and assumptions that are subject to examination by the Internal Revenue Service and other tax authorities. In addition, the calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax regulations. We recognize liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. While we believe we have appropriate support for the positions taken on our tax returns, we regularly assess the potential outcomes of examinations by tax authorities in determining the adequacy of our provision for income taxes. We continually assess the likelihood and amount of potential adjustments and adjust the income tax provision, income taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known.

Judgment is required in determining our provision for income taxes, our deferred tax assets and liabilities and the valuation allowance recorded against our net deferred tax assets. Deferred tax assets and liabilities are determined using the enacted tax rates in effect for the years in which those tax assets are expected to be realized. A valuation allowance is established when it is more likely than not the future realization of all or some of the deferred tax assets will not be achieved. The evaluation of the need for a valuation allowance is performed on a jurisdiction-by-jurisdiction basis and includes a review of all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations.

Based on all available evidence, both positive and negative, and the weight of that evidence to the extent such evidence can be objectively verified, we believe that recognition of the deferred tax assets arising from future tax benefits is currently not more likely than not to be realized and, accordingly, we have determined a need for a full valuation allowance.
 

Recent Accounting Pronouncements

Accounting Standards Update 2016-13

In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments, which was codified in Accounting Standards Codification ASC 326, Financial Instruments — Credit Losses. The standard changes the methodology for measuring credit losses on financial instruments and the timing of when such losses are recorded. Because we were a smaller reporting company based on the most recent determination as of November 15, 2019, ASC 326 became effective for us for fiscal years beginning after December 15, 2022. As such, we adopted ASC 326 effective January 1, 2023, utilizing the modified retrospective transition method. Upon adoption, we updated our impairment model to utilize a forward-looking current expected credit losses (“CECL”) model in place of the incurred loss methodology for financial instruments measured at amortized cost, primarily including our accounts receivable and contract asset. In relation to AFS debt securities, the guidance eliminates the concept of “other-than-temporary” impairment, and instead focuses on determining whether any impairment is a result of a credit loss or other factors. The adoption of ASC 326 did not have a material impact on our consolidated financial statements as of the adoption date.

In November 2023, FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires public entities to disclose information about their reportable segments’ significant expenses and other segment items on an interim and annual basis. Public entities with a single reportable segment are required to apply the disclosure requirements in ASU 2023-07, as well as all existing segment disclosures and reconciliation requirements in ASC 280 on an interim and annual basis. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. We are currently evaluating the impact of adopting ASU 2023-07.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires public entities, on an annual basis, to provide disclosure of specific categories in the rate reconciliation, as well as disclosure of income taxes paid disaggregated by jurisdiction. ASU 2023-09 is effective for fiscal

years beginning after December 15, 2024, with early adoption permitted. We are currently evaluating the impact of adopting ASU 2023-09.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

3.Fair Value Measurements

We measure fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The accounting standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value which are the following:

•Level 1—Observable inputs, such as quoted prices in active markets for identical assets or liabilities;

•Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

•Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities; therefore, requiring an entity to develop its own valuation techniques and assumptions.

Assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurements. We review the fair value hierarchy classification on a quarterly basis. Changes in the ability to observe valuation inputs may result in a reclassification of levels for certain assets or liabilities within the fair value hierarchy. There were no transfers between Level 1, 2 and 3 during the years ended December 31, 2023 and 2022.

The carrying amounts of cash equivalents, accounts and other receivables, accounts payable and accrued liabilities are considered reasonable estimates of their respective fair value because of their short-term nature.

Recurring Fair Value Measurements

The following table represents the fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis (in thousands):

	Level 1		Level 2		Level 3		Total
December 31, 2023
Assets
Money market funds	$	131,635	$	-	$	-	$	131,635
U.S. treasuries		-		74,237		-		74,237
U.S. government agency securities		-		216,688		-		216,688
Corporate debt securities		-		308,552		-		308,552
Total assets	$	131,635	$	599,477	$	-	$	731,112
	Level 1		Level 2		Level 3		Total
December 31, 2022
Assets
Money market funds	$	172,418	$	-	$	-	$	172,418
U.S. treasuries		-		42,308		-		42,308
U.S. government agency securities		-		88,032		-		88,032
Corporate debt securities		-		292,051		-		292,051
Total assets	$	172,418	$	422,391	$	-	$	594,809

Money market funds are highly liquid investments and are actively traded. The pricing information on these investment instruments is readily available and can be independently validated as of the measurement date. This approach results in the classification of these securities as Level 1 of the fair value hierarchy.

U.S. treasuries, U.S. government agency securities and corporate debt securities are measured at fair value using Level 2 inputs. We review trading activity and pricing for these investments as of each measurement date. When sufficient quoted pricing for identical securities is not available, we use market pricing and other observable market inputs for similar securities obtained from various third-party data providers. These inputs represent quoted prices for similar assets in active markets or these inputs have been derived from observable market data. This approach results in the classification of these securities as Level 2 of the fair value hierarchy.

Warrants were issued in connection with the underwritten public offering in August 2019 and are accounted for as a derivative liability at fair value (See Note 14). The fair value of the warrant liability was estimated using the Black-Scholes model, which requires assumptions such as expected term, expected volatility and risk-free interest rate. These assumptions are subjective and require judgment to develop. Expected term is estimated using the full remaining contractual term of the warrants. We determine expected volatility based on our historical common stock price volatility. The warrant liability was classified as a Level 3 instrument as its value was based on unobservable inputs that are supported by little or no market activity. As of December 31, 2022, all 1,882,600 of the outstanding warrants as of December 31, 2021 have been exercised or expired.

The following table provides a summary of changes in the fair value warrant liability for year ended December 31, 2022 (in thousands):

Balance at December 31, 2021	$	18,016
Decrease in fair value of warrants exercised		(1,801	)
Warrants exercised or expired		(16,215	)
Balance at December 31, 2022	$	-

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Cash, Cash Equivalents, Restricted Cash and Marketable Securities

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Cash, Cash Equivalents, Restricted Cash and Marketable Securities

4.Cash and Cash Equivalents, Restricted Cash and Marketable Securities

The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows (in thousands):

	December 31,
	2023		2022		2021
Cash and cash equivalents	$	150,279	$	202,004	$	436,189
Restricted cash (1)		277		207		219
Total cash and cash equivalents, and restricted cash shown in the    consolidated statements of cash flows	$	150,556	$	202,211	$	436,408

(1) Restricted cash is included in "Other assets" in the Consolidated Balance Sheets.

Restricted cash balances relate to certificates of deposit issued as collateral to certain letters of credit issued as security to our lease arrangements (See Note 8).

Cash and cash equivalents, and marketable securities consist of the following (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
December 31, 2023
Cash and cash equivalents:
Cash	$	11,190	$	-	$	-		$	11,190
Money market funds		131,635		-		-			131,635
Corporate debt securities		7,453		1		-			7,454
Total cash and cash equivalents		150,278		1		-			150,279
Marketable securities available-for-sale:
U.S. treasuries		74,109		172		(44	)		74,237
U.S. government agency securities		216,265		692		(269	)		216,688
Corporate debt securities		300,803		315		(20	)		301,098
Total marketable securities available-for-sale		591,177		1,179		(333	)		592,023
Total cash and cash equivalents, and marketable securities	$	741,455	$	1,180	$	(333	)	$	742,302
December 31, 2022
Cash and cash equivalents:
Cash	$	29,586	$	-	$	-		$	29,586
Money market funds		172,418		-		-			172,418
Total cash and cash equivalents		202,004		-		-			202,004
Marketable securities available-for-sale:
U.S. treasuries		42,502		-		(194	)		42,308
U.S. government agency securities		88,429		-		(397	)		88,032
Corporate debt securities		292,865		12		(826	)		292,051
Total marketable securities available-for-sale		423,796		12		(1,417	)		422,391
Total cash and cash equivalents, and marketable securities	$	625,800	$	12	$	(1,417	)	$	624,395

The maturities of our marketable securities available-for-sale are as follows (in thousands):

.	December 31, 2023
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	440,131	$	440,104
Mature after one year through two years		151,046		151,919
	$	591,177	$	592,023

We have classified our entire investment portfolio as available-for-sale and available for use in current operations and accordingly have classified all investments as short-term. Available-for-sale securities are carried at fair value based on inputs that are observable, either directly or indirectly, such as quoted market prices for similar securities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the securities. Unrealized losses are included in accumulated other comprehensive loss in stockholders’ equity. Commencing with our adoption of ASC 326 on January 1, 2023, we determine whether a decline in the fair value of our AFS debt securities below their amortized cost basis (i.e., an impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in other comprehensive income (loss), net of applicable taxes. Credit-related impairments (if any) are recognized as an allowance on the balance sheet with a corresponding adjustment to earnings. Both the allowance and the adjustment to net income can be reversed if conditions change.

There were no realized gains or losses from the sale of marketable securities for the years ended December 31, 2023 and 2022. We do not intend to sell, and are not required to sell, the investments that are in an unrealized loss position before recovery of their amortized cost basis. For the year ended December 31, 2023, we did not record an allowance for credit losses, as management believes any such losses would be immaterial based on the investment-grade credit rating for each of the investments as of December 31, 2023. As such, there have been no declines in fair value that have been identified as a credit-related impairment.

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Inventories, Net

12 Months Ended

Dec. 31, 2023

Inventory Disclosure [Abstract]

Inventories, net

5.Inventories

The following table presents inventories (in thousands):

	December 31,
	2023		2022
Raw materials	$	27,256	$	25,517
Work-in-process		18,954		23,934
Finished goods		7,080		9,995
Total	$	53,290	$	59,446

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Property and Equipment, Net

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

6.Property and Equipment, net

Property and equipment consist of the following (in thousands):

	Estimated Useful	December 31,
	Life (In years)	2023			2022
Manufacturing equipment	5-13	$	15,752		$	15,139
Lab equipment	5-13		2,827			2,360
Computer equipment	3		5,060			4,720
Furniture and fixtures	3-13		2,467			2,464
Leasehold improvements	2-12		37,201			28,822
Assets in progress			5,822			11,613
			69,129			65,118
Less accumulated depreciation and amortization			(31,832	)		(27,522	)
Total		$	37,297		$	37,596

Depreciation and amortization expense on property and equipment was $4.3 million, $3.8 million and $4.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

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Current Accrued Liabilities

12 Months Ended

Dec. 31, 2023

Disclosure Component Of Current Accrued Liabilities And Accrued Research And Development [Abstract]

Current Accrued Liabilities

7.Current Accrued Liabilities

Current accrued liabilities consist of the following (in thousands):

	December 31,
	2023		2022
Payroll and related expenses	$	17,069	$	14,261
Revenue reserve accruals		21,004		10,552
Accrued inventory		4,456		2,209
Other accrued liabilities		6,919		3,697
Total	$	49,448	$	30,719

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

8.Commitments and Contingencies

Leases

We lease our facilities in Emeryville, California and Düsseldorf, Germany. We lease and sublease certain manufacturing and office space with lease terms ranging from 3 to 12 years. These leases require monthly lease payments that may be subject to annual increases throughout the lease term. Certain of these leases also include options to renew or extend the lease for two successive five-year terms. These optional periods have not been considered in the determination of the right-of-use assets or lease liabilities associated with these leases as we did not consider the exercise of these options to be reasonably certain.

We also sublease one of our leased premises to a third party. Rent is subject to scheduled annual increases and the subtenant is responsible for certain operating expenses and taxes throughout the life of the sublease. The sublease term expires on March 31, 2031, unless earlier terminated, concurrent with the term of our lease. The subtenant has no option to

extend the sublease term. Sublease income was $7.6 million, $7.7 million and $7.7 million for the years ended December 31, 2023, 2022 and 2021, respectively. Sublease income is included in other income (expense) in our consolidated statements of operations. Rent received from the subtenant in excess of rent paid to the landlord shall be shared by paying the landlord 50% of the excess rent. The excess rent is considered a variable lease payment and the total estimated payments are being recognized as additional rent expense on a straight-line basis.

Our lease expense comprises of the following (in thousands):

	Year Ended December 31,
	2023		2022		2021
Operating lease expense	$	5,563	$	6,222	$	6,265

Cash paid for amounts included in the measurement of lease liabilities for the years ended December 31, 2023, 2022, and 2021 was $7.2 million, $6.8 million, and $7.0 million, respectively and were included in change in lease liabilities in our consolidated statement of cash flows.

The balance sheet classification of our operating lease liabilities was as follows (in thousands):

	December 31,
	2023		2022
Operating lease liabilities:
Current portion of lease liabilities (included in other current liabilities)	$	4,496	$	3,631
Long-term portion of lease liabilities		29,720		32,801
Total operating lease liabilities	$	34,216	$	36,432

As of December 31, 2023, the maturities of our sublease income and operating lease liabilities were as follows (in thousands):

Years ending December 31,	Sublease Income		Operating Lease Liabilities
2024	$	5,684	$	7,605
2025		5,854		6,980
2026		6,030		6,122
2027		6,211		6,052
2028		6,397		6,215
Thereafter		15,103		15,062
Total	$	45,279		48,036
Less:
Present value adjustment				(13,820	)
Total			$	34,216

The weighted average remaining lease term and the weighted average discount rate used to determine the operating lease liabilities were as follows:

	December 31,
	2023			2022
Weighted average remaining lease term	6.7 years			7.6 years
Weighted average discount rate		10.1	%		10.1	%

Commitments

As of December 31, 2023, our material non-cancelable purchase and other commitments for the supply of HEPLISAV-B totaled $43.4 million. The following summarizes our material purchase commitments at December 31, 2023 and the effect those obligations are expected to have on our liquidity and cash flows in future periods (in thousands):

Years ending December 31,	(in thousands)
2024	$	18,866
2025		11,983
2026		12,516
2027		-
2028		-
Thereafter		-
Total	$	43,365

On September 7, 2023 (the “Effective Date”), we entered into an agreement (the “Avecia Supply Agreement”) with Nitto Denko Avecia Inc. (“Avecia”) for the manufacture and supply of our CpG 1018 adjuvant using a specific production process. Under the Avecia Supply Agreement, Avecia has agreed to produce and supply to us quantities of CpG 1018 adjuvant ordered by us after the Effective Date. Subject to certain conditions in the Avecia Supply Agreement, we are obligated to purchase all of our annual volume requirements of CpG 1018 adjuvant from Avecia up to a specified production capacity. We may alternatively order CpG 1018 adjuvant produced using a different production process pursuant to the existing supply agreement between us and Avecia dated October 1, 2012 (the “2012 Agreement”). As of December 31, 2023, our aggregate minimum commitment for the supply of CpG 1018 adjuvant under the Avecia Supply Agreement was $7.4 million within the next 12 months. As of December 31, 2022, we had no non-cancelable purchase and other commitments for the supply of CpG 1018 adjuvant.

In addition to the non-cancelable commitments included above, we have entered into contractual arrangements that obligate us to make payments to the contractual counterparties upon the occurrence of future events. In addition, in the normal course of operations, we have entered into license and other agreements and intend to continue to seek additional rights relating to compounds or technologies in connection with our discovery, manufacturing and development programs. Under the terms of the agreements, we may be required to pay future up-front fees, milestones and royalties on net sales of products originating from the licensed technologies, if any, or other payments contingent upon the occurrence of future events that cannot reasonably be estimated.

We also rely on and have entered into agreements with research institutions, contract research organizations and clinical investigators as well as clinical material manufacturers. These agreements are terminable by us upon written notice. Generally, we are liable only for actual effort expended by the organizations at any point in time during the contract through the notice period.

As of December 31, 2023, the aggregate principal amount of our convertible senior notes ("Convertible Notes") was $225.5 million, excluding debt discount of $2.8 million (See Note 10).

During 2004, we established a letter of credit with Deutsche Bank as security for our Düsseldorf lease in the amount of €0.2 million (Euros). The letter of credit remained outstanding through December 30, 2023 and was collateralized by a certificate of deposit for €0.2 million, which has been included in restricted cash in the consolidated balance sheets as of December 31, 2023 and 2022.

In conjunction with our agreement with Symphony Dynamo, Inc. and Symphony Dynamo Holdings LLC (“Holdings”) in November 2009, we agreed to make contingent cash payments to Holdings equal to 50% of the first $50 million from any upfront, pre-commercialization milestone or similar payments received by us from any agreement with any third party with respect to the development and/or commercialization of cancer and hepatitis C therapies originally licensed to Symphony Dynamo, Inc., including our immune-oncology compound, SD-101. In July 2020, we sold assets related to SD-101 to Surefire Medical, Inc. d/b/a TriSalus Life Sciences (“TriSalus”). We paid $2.5 million to Holdings in August 2020. In each of September 2021, May 2022 and September 2023, we received $1.0 million from TriSalus because it met pre-commercialization milestones. We recorded the proceeds as gain on sale of assets in our consolidated statements of operations. We paid Holdings $0.5 million in each of September 2021, May 2022 and October 2023. We included the payments in selling, general and administrative expenses in our consolidated statements of operations.

Contingencies

From time to time, we may be involved in claims, suits, and proceedings arising from the ordinary course of our business, including actions with respect to intellectual property claims, commercial claims, and other matters. Such claims, suits, and proceedings are inherently uncertain and their results cannot be predicted with certainty. Regardless of the outcome, such legal proceedings can have an adverse impact on us because of legal costs, diversion of management resources, and other factors. In addition, it is possible that a resolution of one or more such proceedings could result in substantial damages, fines, penalties or orders requiring a change in our business practices, which could in the future materially and adversely affect our financial position, results of operations, or cash flows in a particular period.

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Collaborative Research, Development and License Agreements

12 Months Ended

Dec. 31, 2023

Research and Development [Abstract]

Collaborative Research, Development and License Agreements

9.Collaborative Research, Development and License Agreements

Coalition for Epidemic Preparedness Innovations

In January 2021, we entered into an agreement (together with subsequent amendments, the “CEPI Agreement”) with Coalition for Epidemic Preparedness Innovations (“CEPI”) for the manufacture and reservation of a specified quantity of CpG 1018 adjuvant (“CpG 1018 Materials”). In May 2021, we entered into the first amendment to the CEPI Agreement. The CEPI Agreement enables CEPI to direct the supply of CpG 1018 Materials to CEPI partner(s). CEPI partner(s) would purchase CpG 1018 Materials under separately negotiated agreements. The CEPI Agreement also allows us to sell CpG 1018 Materials to third parties if not purchased by a CEPI partner within a two-year term.

In exchange for reserving CpG 1018 Materials and agreeing to sell CpG 1018 Materials to CEPI partner(s) at pre-negotiated prices, CEPI agreed to provide payments in the form of an interest-free, unsecured, forgivable loan (the “Advance Payments”). We are obligated to repay the Advance Payments, in proportion to quantity sold, if and to the extent we receive payments from sales of CpG 1018 Materials reserved under the CEPI Agreement. If the vaccine programs pursued by CEPI partner(s) are unsuccessful and no alternative use is found for CpG 1018 Materials reserved under the CEPI Agreement, the applicable Advance Payments will be forgiven at the end of the two-year term.

On April 27, 2023, we entered into a waiver and second amendment to the CEPI Agreement by and between us and CEPI (the “CEPI-Bio E Assignment Agreement”). Pursuant to the CEPI-Bio E Assignment Agreement, CEPI has forgiven the entirety of the outstanding Advance Payments for CpG 1018 Materials allocated to and ordered by Bio E under the CEPI Agreement and has assumed our previous rights to $47.4 million of Bio E accounts receivable.

Through December 31, 2023, we received Advance Payments totaling approximately $175.0 million pursuant to the CEPI Agreement, of which $67.3 million have been repaid and $47.4 million have been forgiven (as discussed above). As of December 31, 2023, remaining Advance Payments totaling $60.3 million in CEPI accrual long-term were reflected in our consolidated balance sheets, representing the outstanding balance of the Advance Payments relating to the Clover Supply Agreement (as defined and discussed below). As of December 31, 2022, we recorded Advance Payments of $107.7 million included in CEPI accrual. There were no deferred revenue balances related to the CEPI Agreement as of December 31, 2023 and December 31, 2022.

Zhejiang Clover Biopharmaceuticals, Inc. and Clover Biopharmaceuticals (Hong Kong) Co., Limited

In June 2021, we entered into an agreement with Zhejiang Clover Biopharmaceuticals, Inc. and Clover Biopharmaceuticals (Hong Kong) Co., Limited (collectively, “Clover”), for the commercial supply of CpG 1018 adjuvant, for use with Clover’s COVID-19 vaccine candidate, SCB-2019 (together with subsequent amendments, the “Clover Supply Agreement”). Under the Clover Supply Agreement, Clover committed to purchase specified quantities of CpG 1018 adjuvant, at pre-negotiated prices pursuant to the CEPI Agreement, for use in Clover’s commercialization of vaccines containing SCB-2019 and CpG 1018 adjuvant (“Clover Product”). The Clover Supply Agreement also provides terms for Clover to order additional quantities of CpG 1018 adjuvant beyond the quantities reserved by CEPI. In 2022 and 2023, we signed four amendments to the Clover Supply Agreement. The terms and conditions of the Clover Supply Agreement were operative through December 2022, and as of December 31, 2022, we had satisfied all delivery obligations thereunder.

For CpG 1018 adjuvant reserved for Clover under the CEPI Agreement, Clover is obligated to pay us the purchase price upon the earliest of (i) the true-up exercise, (ii) within a specified period after Clover delivers Clover Product to a customer, or (iii) Clover’s receipt of payment for Clover Product from a customer. When we transfer control of CpG 1018 adjuvant that is reserved under the CEPI Agreement, we recognize product revenue and a corresponding contract asset as our right to consideration is contingent on something other than the passage of time, as outlined above.

The contract asset of $71.3 million relating to Clover was included in other current assets as of December 31, 2022. The contract asset was subsequently reclassified to other assets (long term) and remains classified in other assets (long term) as of December 31, 2023. The contract asset was reclassified to other assets (long term) to reflect the timing of expected long term demand for CpG 1018 adjuvant for Clover Product.

Corresponding Advance Payments of $60.3 million relating to Clover are recorded in CEPI accrual long-term in our consolidated balance sheets as of December 31, 2023. These Advance Payments may be repaid using cash collected from Clover or forgiven in accordance with the CEPI Agreement. We had no accounts receivable balance from Clover as of December 31, 2023 and December 31, 2022. We did not recognize CpG 1018 adjuvant net product revenue from Clover for the year ended December 31, 2023. We recognized CpG 1018 adjuvant net product revenue of $288.0 million for the year ended December 31, 2022.

Additionally, during the year ended December 31, 2022 and in connection with amendments to the Clover Supply Agreement, which reduced or cancelled certain orders for CpG 1018 adjuvant, we recorded an inventory write-off of $34.3 million of excess CpG 1018 adjuvant raw materials and finish goods inventory. This excess inventory write-off was reflected as a charge to cost of sales – product, in the consolidated statements of operations for the year ended December 31, 2022.

Biological E. Limited

In July 2021, we entered into an agreement (together with subsequent amendments, the “Bio E Supply Agreement”) with Biological E. Limited (“Bio E”), for the commercial supply of CpG 1018 adjuvant, for use with Bio E’s subunit COVID-19 vaccine candidate, CORBEVAX™. Under the Bio E Supply Agreement, Bio E committed to purchase specified quantities of CpG 1018 adjuvant, at pre-negotiated prices pursuant to the CEPI Agreement, for use in Bio E’s commercialization of its CORBEVAX vaccine (“Bio E Product”) with specified delivery dates in 2021 and the first quarter of 2022. The Bio E Supply Agreement also provides terms for Bio E to order additional quantities of CpG 1018 adjuvant beyond the quantities reserved by CEPI. In June 2022 and in October 2022, we entered into amendments to the Bio E Supply Agreement (the “Bio E Amendment No. 1” and the “Bio E Amendment No. 2,” together the “Bio E Amendments”). The Bio E Amendments primarily established: (i) a new payment schedule for certain outstanding invoices related to the CEPI product to be the earlier of December 31, 2022, or receipt of certain amounts from Bio E from the Government of India in connection with their advance purchase agreement for CORBEVAX, and (ii) further modified the scope of the Bio E Supply Agreement, by reducing certain quantities of CpG 1018 adjuvant to be delivered. The terms and conditions of the Bio E Supply Agreement were operative through December 2022, and as of December 31, 2022, we had satisfied all delivery obligations thereunder.

As of December 31, 2023, we had no accounts receivable balance from Bio E. During the first quarter of 2023, we recorded an allowance for doubtful accounts of $12.3 million, which was determined by assessing changes in Bio E’s credit risk, contemplation of ongoing negotiations relating to Bio E Amendment No. 3 (defined below), and Bio E's dependence on cash collections from the Government of India, which have been delayed and significantly reduced in connection with the overall reduction in demand for CORBEVAX from the Government of India.

On April 26, 2023, we entered into a third amendment to the Bio E Supply Agreement (the “Bio E Amendment No. 3”), and on April 27, 2023, we entered into the CEPI-Bio E Assignment Agreement. Pursuant to the CEPI-Bio E Assignment Agreement, CEPI has forgiven the entirety of remaining amounts outstanding relating to a liability for Advance Payments of $47.4 million (the “Bio E CEPI Advance Payments”) for CpG 1018 Materials allocated to Bio E, and has assumed our previous rights to collect $47.4 million of Bio E accounts receivable. Pursuant to the Bio E Amendment No. 3, we collected $14.5 million from Bio E (including $13.5 million in April 2023 and $1.0 million in August 2023). Accordingly, as of December 31, 2023, the CEPI-Bio E Assignment Agreement resulted in: (i) no accounts receivable balance, and (ii) the derecognition of $47.4 million CEPI accrual in connection with the Bio E CEPI Advance Payments. The Bio E Amendment No. 3 provides for additional future payment of either $5.5 million in the event that Bio E receives at least $125.0 million, or $12.3 million in the event that Bio E receives at least $250.0 million in future payments from the Government of India associated with its CORBEVAX product on or before August 15, 2025. These additional amounts are not considered collectible until the achievement of these future milestones.

We did not recognize CpG 1018 adjuvant net product revenue from Bio E for the year ended December 31, 2023. We recognized CpG 1018 adjuvant net product revenue of $206.2 million for the year ended December 31, 2022.

U.S. Department of Defense

In September 2021, we entered into an agreement with the DoD for the development of a recombinant plague vaccine adjuvanted with CpG 1018 adjuvant for approximately $22.0 million over two and a half years. Under the agreement, we are

conducting a Phase 2 clinical trial combining our CpG 1018 adjuvant with the DoD's rF1V vaccine. In July 2023, we executed a contract modification with the DoD to support advancement into a nonhuman primate challenge study, with the agreement now totaling $33.7 million through 2025. For the years ended December 31, 2023 and 2022, we recognized revenue of $17.6 million and $8.8 million, respectively, which is included in other revenue in our consolidated statements of operations.

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Convertible Notes

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Convertible Notes

10.Convertible Notes

In May 2021, we issued $225.5 million of Convertible Notes in a private placement. Total proceeds from the issuance of the Convertible Notes, net of debt issuance and offering costs of $5.7 million, were $219.8 million. We used $190.2 million of the net proceeds to retire our previous loan agreement with CRG Servicing LLC and $27.2 million of the net proceeds to pay the costs of the Capped Calls described below.

The Convertible Notes are general, unsecured obligations and accrue interest at a rate of 2.50% per annum payable semiannually in arrears on May 15 and November 15 of each year, beginning on November 15, 2021. The Convertible Notes mature on May 15, 2026, unless converted, redeemed or repurchased prior to such date.

The Convertible Notes are convertible into cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, at an initial conversion rate of 95.5338 shares of our common stock per $1,000 principal amount of the Convertible Notes, which is equivalent to an initial conversion price of approximately $10.47 per share of our common stock. The Convertible Notes are convertible at the option of the holders at any time prior to the close of business on the business day immediately preceding February 15, 2026, only under the following circumstances:

•During any calendar quarter (and only during such calendar quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;

•During the five business day period after any ten consecutive trading day period (the “measurement period”), in which the “trading price” (as defined in the indenture governing the Convertible Notes) per $1,000 principal amount of the Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such trading day;

•If we call such Convertible Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or

•Upon the occurrence of specified corporate events as set forth in the indenture governing the Convertible Notes.

On or after February 15, 2026, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the Convertible Notes may convert all or any portion of their Convertible Notes regardless of the foregoing circumstances.

Since we have the election of repaying the Convertible Notes in cash, shares of our common stock, or a combination of both, we continued to classify the Convertible Notes as long-term debt on the consolidated balance sheets as of December 31, 2023.

We may redeem for cash all or any portion of the Convertible Notes (subject to the partial redemption limitation described in the indenture governing the Convertible Notes), at our option, on or after May 20, 2024 and prior to the 31st scheduled trading day immediately preceding the maturity date, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on the trading day immediately preceding the date on which we provide notice of redemption, at a redemption price equal to 100% of the principal amount of the Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.

If we undergo a fundamental change (as set forth in the indenture governing the Convertible Notes), noteholders may require us to repurchase for cash all or any portion of their Convertible Notes at a repurchase price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, following certain corporate events (as set forth in the indenture governing the Convertible Notes) or if we deliver a notice of redemption prior to the maturity date, we will, in certain circumstances, adjust the conversion rate for a noteholder who elects to convert its notes in connection with such a corporate event or such notice of redemption.

We accounted for the Convertible Notes as a single liability in accordance with ASU 2020-06 - Accounting for Convertible Instruments and Contracts in an Entity's Own Equity (“ASU 2020-06”). As of December 31, 2023, the Convertible Notes were recorded at the aggregate principal amount of $225.5 million less unamortized issuance costs of $2.8 million as a long-term liability on the consolidated balance sheets. As of December 31, 2023, the fair value of the Convertible Notes was $330.1 million. The fair value was estimated using a reputable third-party valuation model based on observable inputs and is considered Level 2 in the fair value hierarchy. The debt issuance costs are amortized to interest expense over the contractual term of the Convertible Notes at an effective interest rate of 3.1%.

The following table presents the components of interest expense related to Convertible Notes (in thousands):

	Year Ended December 31,
	2023		2022
Stated coupon interest	$	5,636	$	5,638
Amortization of debt issuance cost		1,121		1,094
Total interest expense	$	6,757	$	6,732

Capped Calls

In connection with the issuance of the Convertible Notes, we entered into capped call transactions with one of the initial purchasers of the Convertible Notes and other financial institutions, totaling $27.2 million (the “Capped Calls”). The Capped Calls cover, subject to customary adjustments, the number of shares of our common stock that initially underlie the Convertible Notes (or 21,542,871 shares of our common stock). The Capped Calls have an initial strike price and an initial cap price of $10.47 per share and $15.80 per share, respectively, subject to certain adjustments. Conditions that cause adjustments to the initial strike price of the Capped Calls mirror conditions that result in corresponding adjustments to the conversion price of the Convertible Notes. The Capped Calls are expected to offset the potential dilution to our common stock as a result of any conversion of the Convertible Notes, subject to a cap based on the cap price.

For accounting purposes, the Capped Calls are considered separate financial instruments and not part of the Convertible Notes. As the Capped Calls transactions meet certain accounting criteria, we recorded the cost of the Capped Calls, totaling $27.2 million, as a reduction to additional paid-in capital within the consolidated statements of stockholders’ equity.

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Long-Term Debt

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Long-Term Debt

11.Long-Term Debt

Long-Term Debt

On February 20, 2018, we entered into a $175.0 million term Loan Agreement with CRG Servicing LLC. We borrowed $100.0 million under the Loan Agreement at closing and the remaining $75.0 million in March 2019 (collectively, “Term Loans”). Net proceeds under the Loan Agreement were $173.3 million. The Term Loans under the Loan Agreement bore interest at a rate equal to 9.5% per annum. The Term Loans had a maturity date of December 31, 2023.

In May 2021, we repaid the principal on the Term Loans, in full, using the net proceeds from the Convertible Notes issuance. In connection with the early repayment of the Term Loans, in the year ended December 31, 2021, we recorded $5.2 million loss on debt extinguishment related to the amount we paid to terminate the Term Loans in excess of its carrying value at the time of the repayment. Our final payment of $190.2 million to CRG Servicing LLC satisfied all of our obligations under the Loan Agreement. With the full repayment of the Term Loans, all security interests, covenants, liens and encumbrances under the Loan Agreement were permanently released.

We recorded $7.0 million of interest expense related to the Term Loans during the year ended December 31, 2021.

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Revenue Recognition

12 Months Ended

Dec. 31, 2023

Revenue Recognition [Abstract]

Revenue Recognition

12.Revenue Recognition

Disaggregation of Revenues

The following table disaggregates our product revenue, net by product and geographic region and disaggregates our other revenues by geographic region (in thousands):

	Year Ended						Year Ended						Year Ended
	December 31, 2023						December 31, 2022						December 31, 2021
	U.S.		Non U.S.		Total		U.S.		Non U.S.		Total		U.S.		Non U.S.		Total
Product revenue, net
HEPLISAV-B	$	213,295	$	-	$	213,295	$	124,996	$	941	$	125,937	$	61,870	$	-	$	61,870
CpG 1018 adjuvant		-		-		-		-		587,708		587,708		-		375,229		375,229
Total product revenue, net	$	213,295	$	-	$	213,295	$	124,996	$	588,649	$	713,645	$	61,870	$	375,229	$	437,099
Other revenue		17,650		1,339		18,989		8,774		264		9,038		1,915		428		2,343
Total revenues	$	230,945	$	1,339	$	232,284	$	133,770	$	588,913	$	722,683	$	63,785	$	375,657	$	439,442

Revenues from Major Customers and Collaboration Partners

All of our HEPLISAV-B sales in the U.S. are to certain wholesalers and specialty distributors whose principal customers include independent hospitals and clinics, integrated delivery networks, public health clinics and prisons, the Department of Defense, the Department of Veterans Affairs and retail pharmacies. All of our HEPLISAV-B sales in Germany are to one distributor.

The following table summarizes HEPLISAV-B product revenue from each of our three largest customers (as a percentage of total HEPLISAV-B net product revenue):

	Year Ended
	December 31,
	2023			2022			2021
Largest customer		28	%		21	%		21	%
Second largest customer		27	%		17	%		19	%
Third largest customer		17	%		16	%		19	%

The following table summarizes CpG 1018 adjuvant product revenue from each of our three largest collaboration partners (as a percentage of total CpG 1018 adjuvant product revenue):

	Year Ended
	December 31,
	2023			2022			2021
Largest collaboration partner		0	%		49	%		49	%
Second largest collaboration partner		0	%		35	%		24	%
Third largest collaboration partner		0	%		12	%		19	%

Contract Balances

The following table summarizes balances and activities in HEPLISAV-B product revenue allowance and reserve categories (in thousands):

	Balance at Beginning of Period		Provisions related to current period sales		Credit or payments made during the period			Adjustments related to prior periods			Balance at End of Period
Year ended December 31, 2023:
Accounts receivable reserves (1)	$	8,179	$	55,604	$	(54,143	)	$	(2,629	)	$	7,011
Revenue reserve accruals (2)	$	10,552	$	46,062	$	(38,207	)	$	2,597		$	21,004
Year ended December 31, 2022:
Accounts receivable reserves (1)	$	3,823	$	34,758	$	(30,402	)	$	-		$	8,179
Revenue reserve accruals (2)	$	8,253	$	24,806	$	(22,507	)	$	-		$	10,552

(1) Reserves are for chargebacks, discounts and other fees.

(2) Accruals are for returns, rebates and other fees.

When we transfer control of CpG 1018 adjuvant that is reserved under the CEPI Agreement to Clover and perform services under our agreement with the DoD, we recognize product revenue and a corresponding contract asset as our right to consideration is conditioned on something other than the passage of time. See Note 9 for further discussion. The following table summarizes balances and activities in our contract asset account (in thousands):

	Balance at Beginning of Period		Additions		Subtractions			Reclassification (1)			Balance at End of Period
Year ended December 31, 2023:
Contract asset, included in other current assets (2)	$	71,965	$	17,650	$	(16,919	)	$	(71,307	)	$	1,389
Contract asset, included in other assets (long term)	$	-	$	-	$	-		$	71,307		$	71,307
Year ended December 31, 2022:
Contract asset	$	62,525	$	17,556	$	(8,116	)	$	-		$	71,965

(1) The Clover contract asset was reclassified to long term assets to reflect the timing of expected long term demand for CpG 1018 adjuvant for Clover Product. See Note 9 for further discussion.

(2) The $1.4 million of contract asset is derived from our agreement with the DoD.
 

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Net (Loss) Income Per Share

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Net Loss Per Share

13.Net (Loss) Income Per Share

Basic net (loss) income per share is computed by dividing net (loss) income attributable to common stockholders by the weighted-average number of shares of our common stock outstanding.

For the calculation of diluted net income per share, net income attributable to common stockholders for basic net income per share is adjusted by the effect of dilutive securities, including awards under our equity compensation plans and change in fair value of warrant liability. Diluted net income per share attributable to common stockholders is computed by dividing the resulting net income attributable to common stockholders by the weighted-average number of fully diluted common shares outstanding.

The numerators and denominators of the basic net (loss) income and diluted net income per share computations for our common stock are calculated as follows (in thousands):

	Year Ended
	December 31,
	2023			2022			2021
Numerator
Net (loss) income	$	(6,389	)	$	293,156		$	76,713
Less: undistributed earnings allocated to participating securities					(283	)		(4,569	)
Net (loss) income allocable to common stockholders, basic		(6,389	)		292,873			72,144
Add: undistributed earnings allocated to Series B and warrants		-			283			4,569
Less: undistributed earnings allocated to Series B and warrants		-			-			(4,190	)
Add: interest expense on convertible notes		-			5,044			3,168
Less: removal of change in fair value of warrant liability		-			(1,801	)		-
Net (loss) income allocable to common stockholders, diluted	$	(6,389	)	$	296,399		$	75,691
Denominator
Weighted average shares used to compute net (loss) income    allocable to common stockholders per share, basic		128,733			126,398			116,264
Effect of dilutive shares:
Stock-based compensation plans		-			2,774			3,075
Convertible Notes (as converted to common stock)		-			21,543			13,667
Effect of dilutive warrants		-			82			-
Weighted average shares used to compute net (loss) income    allocable to common stockholders per share, diluted		128,733			150,797			133,006

The following were excluded from the calculation of diluted net (loss) income per share as the effect of their inclusion would have been anti-dilutive (in thousands).

	December 31,
	2023		2022		2021
Outstanding securities not included in diluted net (loss) income    allocable to common stockholders per share calculation    (in thousands):
Stock options and stock awards		15,158		7,165		5,953
Convertible Notes (as converted to common stock)		21,543		-		-
Warrants (as exercisable into common stock)		-		-		1,883

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Common Stock and Warrants

12 Months Ended

Dec. 31, 2023

Preferred Stock Common Stock And Warrants [Abstract]

Common Stock and Warrants

14.Common Stock and Warrants

Common Stock Outstanding

As of December 31, 2023, there were 129,530,228 shares of our common stock outstanding.

We entered into an at-the-market Sales Agreement with Cowen and Company, LLC (“Cowen”) on August 6, 2020 and an amendment to such agreement on August 3, 2023 (the sales agreement as amended, the “ATM Agreement”). Under the ATM Agreement, we may offer and sell from time to time, at our sole discretion, shares of our common stock having an aggregate offering price of up to $120.0 million through Cowen as our sales agent. We agreed to pay Cowen a commission of up to 3% of the gross sales proceeds of any common stock sold through Cowen under the ATM Agreement. As of December 31, 2023, we had approximately $120.0 million remaining under the ATM Agreement.

Warrants

During the year ended December 31, 2022, all of the 1,882,600 outstanding warrants as of December 31, 2021 were exercised or expired, resulting in cash proceeds totaling $8.5 million. For the year ended December 31, 2022, we recognized

the decrease in the estimated fair value of warrant liability of $1.8 million as income in other income (expense) in our consolidated statements of operations.

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Equity Plans and Stock-Based Compensation

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Equity Plans and Stock-Based Compensation

15.Equity Plans and Stock-Based Compensation

Equity Plans

In January 2021, we adopted the Dynavax Technologies Corporation 2021 Inducement Award Plan (“2021 Inducement Plan”), pursuant to which we reserved 1,500,000 shares of common stock for issuance under the plan to be used exclusively for grants of awards to individuals who were not previously our employees or directors. In June 2021, we amended the 2021 Inducement Plan (“Amended 2021 Inducement Plan”) to increase the number of shares of common stock reserved under the 2021 Inducement Plan to 3,250,000. The Amended 2021 Inducement Plan was terminated effective as of April 3, 2022 and, therefore, there are no shares of our common stock available for grant.

In May 2022, our stockholders approved the amendment and restatement of our 2018 Equity Incentive Plan (the “Amended 2018 EIP”) to, among other things, increase the authorized number of shares of common stock by 15,000,000. The maximum number of shares of common stock that may be issued under the Amended 2018 EIP, will not exceed 32,600,000 shares of common stock. As of December 31, 2023, the Amended 2018 EIP and the Amended and Restated 2014 Employee Stock Purchase Plan are our active plans (the "Plans").

The Amended 2018 EIP is administered by our Board of Directors, or a designated committee of the Board of Directors, and awards granted under the Amended 2018 EIP have a term of 7 years unless earlier terminated by the Board of Directors. As of December 31, 2023, there were 9,388,428 shares of common stock reserved for issuance under the Amended 2018 EIP.

Under our Amended 2018 EIP, we may grant stock options, RSUs, performance-based awards, and other awards that are settled in shares of our common stock. Our equity awards generally vest over a three-year period contingent upon continuous service and unless exercised, expire seven or ten years from the date of grant (or earlier upon termination of continuous service). Activity under our stock plans is set forth below:

Stock Options

The following table summarizes the activity of stock options for the year ended December 31, 2023:

	Shares Underlying Outstanding Options (in thousands)			Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2022		9,339		$	10.70		4.61	$	16,291
Options granted		1,982			11.17
Options exercised		(850	)		7.48
Options cancelled:
Options forfeited (unvested)		(90	)		10.93
Options expired (vested)		(261	)		21.39
Balance at December 31, 2023		10,120		$	10.78		4.18	$	37,388
Vested and expected to vest at December 31, 2023		9,976		$	10.77		4.15	$	37,024
Exercisable at December 31, 2023		7,014		$	10.40		3.50	$	29,613

Stock-based compensation expense related to options was approximately $18.7 million, $17.2 million and $11.1 million for the years ended December 31, 2023, 2022 and 2021, respectively. The total intrinsic value of stock options exercised during the years ended December 31, 2023, 2022 and 2021 was $5.0 million, $7.7 million, and $7.9 million, respectively. The total intrinsic value of exercised stock options is calculated based on the difference between the exercise price and the quoted market price of our common stock as of the close of the exercise date.

The total fair value of stock options vested during the years ended December 31, 2023, 2022 and 2021 was $19.5 million, $17.5 million and $9.0 million, respectively.

Restricted Stock Units

The following table summarizes the activity of RSUs for the year ended December 31, 2023:

	Number of Shares (In thousands)			Weighted-Average Grant-Date Fair Value
Non-vested as of December 31, 2022		3,479		$	11.00
Granted		2,748			11.48
Vested (1)		(1,515	)		10.13
Forfeited		(267	)		11.45
Non-vested as of December 31, 2023		4,445		$	11.57

(1) Inclusive of approximately 600,145 RSUs for the year ended December 31, 2023, which were not converted into shares due to net share settlement in order to cover the required amount of employee withholding taxes. The value of the withheld shares was classified as a reduction to additional paid-in capital.

Stock-based compensation expense related to RSUs was approximately $20.4 million, $13.2 million and $7.9 million for the years ended December 31, 2023, 2022 and 2021, respectively. The aggregate fair value of the RSUs outstanding as of December 31, 2023, 2022 and 2021, based on our stock price on that date, was $62.2 million, $37.0 million and $37.3 million, respectively.

The total fair value of RSUs vested during the years ended December 31, 2023, 2022 and 2021 was $16.1 million, $15.7 million and $4.7 million, respectively.

Market-based Performance Stock Units

We granted PSUs to certain executives. These PSUs vest upon a specified market condition. The summary of PSU activities for the year ended December 31, 2023 is as follows:

	Number of Shares (in thousands)		Weighted-Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2022		193	$	11.62
Granted		364		18.25
Non-vested as of December 31, 2023		557	$	15.95

Stock-based compensation expense related to PSUs was approximately $2.5 million, $0.8 million and $1.8 million for the years ended December 31, 2023, 2022 and 2021, respectively. The aggregate intrinsic value of the PSUs outstanding as of December 31, 2023, 2022 and 2021, based on our stock price on that date, was $7.8 million, $2.1 million and $3.3 million, respectively.

Performance-based Options

As of December 31, 2023, approximately 36,000 shares underlying performance-based options were outstanding.

Significant Assumptions in Estimating Option Fair Value

The fair value of each time-based option is estimated on the date of grant using the Black-Scholes option valuation model. The fair value of each RSU is determined at the date of grant using our closing stock price. The fair value of each PSU is estimated using the Monte Carlo simulation method on the date of grant. The weighted-average assumptions used in the calculations of these fair value measurements are as follows:

	Stock Options									Market-Based Performance Stock Units								Employee Stock Purchase Plan
	Year Ended December 31,									Year Ended December 31,								Year Ended December 31,
	2023			2022			2021			2023			2022			2021		2023			2022			2021
Weighted-average fair value	$	7.32		$	7.95		$	7.17		$	18.25		$	11.62		$	8.40	$	5.35		$	7.37		$	6.48
Risk-free interest rate		4.0	%		2.0	%		0.7	%		4.3	%		1.7	%	From 0.03% to 1.92%			4.9	%		2.1	%		0.1	%
Expected life (in years)		4.5			4.5			4.5			2.9			2.9			2.9		1.3			1.3			1.2
Expected volatility		0.8			0.8			0.9			0.9			0.9			0.9		0.7			1.0			1.0

Expected volatility is based on historical volatility of our stock price. The expected life of options granted is estimated based on historical option exercise and employee termination data. Our senior management, who hold a majority of the options outstanding, and other employees were grouped and considered separately for valuation purposes. The risk-free rate for periods within the contractual life of the option is based on the U.S. treasury yield curve in effect at the time of grant. Forfeiture estimates are based on historical employee turnover. The dividend yield is zero percent for all years and is based on our history and expectation of dividend payouts.

Stock-based Compensation

Compensation expense is based on awards ultimately expected to vest and reflects estimated forfeitures. For equity awards with time-based vesting, the fair value is amortized to expense on a straight-line basis over the vesting periods.

We have also granted performance-based equity awards to certain of our employees. For equity awards with performance-based vesting criteria, the fair value is amortized to expense when the achievement of the vesting criteria becomes probable.

The following table summarizes stock-based compensation expense recorded in each component of operating expenses in our consolidated statements of operations, and amounts capitalized to our inventories (in thousands):

	Year Ended December 31,
	2023		2022		2021
Employees and directors stock-based compensation expense	$	42,592	$	32,915	$	21,285
	Year Ended December 31,
	2023		2022		2021
Research and development	$	9,285	$	5,954	$	3,818
Selling, general and administrative		29,069		23,118		14,894
Cost of sales - product		1,839		1,123		553
Inventories		2,399		2,720		2,020
Total	$	42,592	$	32,915	$	21,285

As of December 31, 2023, the total unrecognized compensation cost related to non-vested stock options and RSUs deemed probable of vesting, including all stock options with time-based vesting, net of estimated forfeitures, amounted to $46.1 million, which is expected to be recognized over the remaining weighted-average vesting period of 1.6 years. As of December 31, 2023, the total unrecognized compensation cost related to PSUs amounted to $5.5 million.

Employee Stock Purchase Plan

The Amended and Restated 2014 Employee Stock Purchase Plan (the “Employee Stock Purchase Plan”) provides for the purchase of common stock by eligible employees. In May 2021, our stockholders approved the amendment and restatement of the Employee Stock Purchase Plan to increase the authorized number of shares of common stock by 1,000,000. The maximum number of shares of common stock that may be issued under the Employee Stock Purchase Plan will not exceed 1,850,000 shares of common stock.

The purchase price per share is the lesser of (i) 85% of the fair market value of the common stock on the commencement of the two-year offer period (generally, the sixteenth day in February or August) or (ii) 85% of the fair market value of the common stock on the exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August). For the year ended December 31, 2023, employees have acquired approximately 161,000 shares of our common stock under the Employee Stock Purchase Plan and approximately 722,000 shares of our common stock remained available for future purchases under the Employee Stock Purchase Plan.

As of December 31, 2023, the total unrecognized compensation cost related to shares of our common stock under the Employee Stock Purchase Plan amounted to $1.0 million, which is expected to be recognized over the remaining weighted-average vesting period of 1.2 years.

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Employee Benefit Plan

12 Months Ended

Dec. 31, 2023

Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]

Employee Benefit Plan

16.Employee Benefit Plan

We maintain a 401(k) Plan, which qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code. Under the 401(k) Plan, participating employees may defer a portion of their pretax earnings. We may, at our discretion, contribute for the benefit of eligible employees. Our contribution to the 401(k) Plan was approximately $1.3 million, $0.9 million and $0.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

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Income Taxes

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

17.Income Taxes

Consolidated (loss) income before provision for income taxes consisted of the following (in thousands):

	Year Ended December 31,
	2023			2022		2021
U.S.	$	(6,275	)	$	292,460	$	75,954
Non U.S.		1,908			1,839		1,567
Total	$	(4,367	)	$	294,299	$	77,521

The components of the consolidated income tax provision for the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31, 2023			Year Ended December 31, 2022			Year Ended December 31, 2021
Current
Federal	$	(178	)	$	(165	)	$	345
State		1,533			897			260
Non-US		667			411			203
Total current tax expense		2,022			1,143			808
Deferred
Federal		-			-			-
State		-			-			-
Non-US		-			-			-
Total deferred tax expense		-			-			-
Total income tax expense	$	2,022		$	1,143		$	808

The difference between the consolidated income tax provision and the amount computed by applying the federal statutory income tax rate to the consolidated income before income taxes in the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Income tax provision (benefit) at federal statutory rate	$	(917	)	$	61,775		$	16,397
State tax		574			(2,942	)		3,576
Business credits		(2,050	)		(3,246	)		(982	)
Uncertain tax positions		334			586			424
Deferred compensation charges		830			(473	)		131
Change in valuation allowance		1,466			(324	)		(86,847	)
Section 162(m) limitation		1,963			1,779			1,241
Mark-to-market of warrants		-			(378	)		10,364
Net operating loss and tax credit limitation		-			(56,908	)		56,459
Other (1)		(518	)		879			(290	)
Foreign taxes		340			395			335
Total income tax expense	$	2,022		$	1,143		$	808

(1) Certain prior year amounts have been reclassified to conform to the current year presentation. In 2022 and 2021, Foreign taxes were included in Other.

Deferred tax assets and liabilities consisted of the following (in thousands):

	December 31,
	2023			2022
Deferred tax assets:
Net operating loss carryforwards	$	96,336		$	113,228
Research credit carryforwards		34,940			33,444
Section 174 capitalization		22,556			15,308
Lease liability		8,868			9,530
Stock compensation		10,572			7,780
Accruals and reserves		15,808			9,089
Other		348			337
Total deferred tax assets		189,428			188,716
Less valuation allowance		(180,387	)		(178,920	)
Net deferred tax assets		9,041			9,796
Deferred tax liabilities:
Fixed assets		(2,667	)		(2,916	)
Operating lease right-of-use assets		(6,345	)		(6,785	)
Other		(29	)		(95	)
Total deferred tax liabilities		(9,041	)		(9,796	)
Net deferred tax assets	$	-		$	-

The tax benefit of net operating losses, temporary differences and credit carryforwards is required to be recorded as an asset to the extent that management assesses that realization is "more likely than not." Realization of the future tax benefits is dependent on our ability to generate sufficient taxable income within the carryforward period. A high degree of judgment is required to determine if, and the extent to which, valuation allowances should be recorded against deferred tax assets. In making such determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations. Based on all available evidence as of December 31, 2023, both positive and negative, and the weight of that evidence to the extent such evidence can be objectively verified, management believes that recognition of the deferred tax assets arising from the above-mentioned future tax benefits is currently not more likely than not to be realized, and, accordingly, has provided a valuation allowance.

The valuation allowance increased by $1.5 million during the year ended December 31, 2023 and decreased by $0.3 million during the year ended December 31, 2022. The increase in valuation allowance during the year ended December 31, 2023 was due to an increase in our deferred tax assets, predominantly related to Section 174 capitalization and increased reserves largely offset by utilization of net operating losses. The decrease in valuation allowance during the year ended December 31, 2022 was due to a decrease in our deferred tax assets, predominantly related to utilization of net operating losses, offset by updates to the Section 382 analysis.

As of December 31, 2023, we had federal net operating loss carryforwards of approximately $23.1 million, which began to expire in the year 2024, federal net operating loss carryforwards of approximately $353.5 million, which do not expire and federal research and development tax credits of approximately $28.3 million, which expire in the years 2024 through 2043.

As of December 31, 2023, we had net operating loss carryforwards for California and other states for income tax purposes of approximately $283.9 million, which expire in the years 2024 through 2040, and California state research and development tax credits of approximately $22.3 million, which do not expire.

As of December 31, 2023, we had no remaining net operating loss carryforwards for foreign income tax purposes.

Uncertain Income Tax positions

The total amount of unrecognized tax benefits was $12.1 million and $11.3 million as of December 31, 2023 and 2022, respectively. If recognized, none of the unrecognized tax benefits would affect the effective tax rate.

The following table summarizes the activity related to our unrecognized tax benefits:

	Year Ended December 31,
	2023			2022
Balance at beginning of year	$	(11,339	)	$	(5,615	)
Tax positions related to the current year
Additions		(762	)		(670	)
Reductions		-			-
Tax positions related to the prior year
Additions		-			(5,054	)
Reductions		-			-
Settlements		-			-
Lapses in statute					-
Balance at end of year	$	(12,101	)	$	(11,339	)

Our policy is to account for interest and penalties as income tax expense. As of December 31, 2023, there was no interest and no penalties recognized in the provision for income taxes. As of December 31, 2022, there were no interest and no penalties recognized in the provision for income taxes. We do not anticipate any significant change within 12 months of this reporting date of its uncertain tax positions.

The Tax Reform Act of 1986 limits the annual use of net operating loss and tax credit carryforwards in certain situations where changes occur in stock ownership of a company. In the event there is a change in ownership, as defined, the annual utilization of such carryforwards could be limited. For the year ended December 31, 2021, we completed a preliminary analysis under Section 382 of the Internal Revenue Code indicating we experienced ownership changes in 2008, 2010, 2012, and 2019 that limited the future use of our pre-change federal and state net operating loss carryforwards and federal research and development tax credits. We finalized the study during the year ended December 31, 2022 and concluded that we only experienced ownership changes in 2008, 2010, and 2012, resulting in a significant reduction in the federal and state net operating loss carryforwards and federal research and development tax credits that are expected to expire unused. We have revised the net operating loss carryforwards and research and development tax credits that are expected to expire unused as a result of the annual limitations in the deferred tax assets and corresponding uncertain tax positions as of December 31, 2022. There were no changes to our Section 382 analysis as of December 31, 2023.

We are subject to income tax examinations for U.S. federal and state income taxes from 2002 forward. We are subject to tax examination in Germany from 2018 forward, in India from 2019 forward and in Italy from 2021 forward.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Basis of Presentation and Principles of Consolidation

Basis of Presentation and Principles of Consolidation

The consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include our accounts and those of our wholly-owned subsidiaries, Dynavax GmbH located in Düsseldorf, Germany, Dynavax India LLP in India and a branch of Dynavax in Italy. All intercompany accounts and transactions among the entities have been eliminated from the consolidated financial statements.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make informed estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Management’s estimates are based on historical information available as of the date of the consolidated financial statements and various other assumptions we believe are reasonable under the circumstances. Actual results may differ materially from these estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known.

Foreign Currency Translation

Foreign Currency Translation

We consider the local currency to be the functional currency for our international subsidiaries, Dynavax GmbH, located in Düsseldorf, Germany, Dynavax India LLP, and a branch of Dynavax registered in Italy. Accordingly, assets and liabilities denominated in this foreign currency are translated into U.S. dollars using the exchange rate in effect on the balance sheet date. Revenues and expenses are translated at average exchange rates prevailing during the year. Currency translation adjustments arising from period to period are charged or credited to accumulated other comprehensive income (loss) in stockholders’ equity.

As of December 31, 2023 and 2022, the cumulative translation adjustments balance was $(3.0) million and $(4.0) million, respectively, primarily related to the translation of Dynavax GmbH assets, liabilities and operating results from Euros to U.S. dollars. For the years ended December 31, 2023, 2022 and 2021, we reported an unrealized foreign currency translation gain (loss) of $1.1 million, $(1.8) million and $(2.5) million, respectively. Realized gains and losses resulting from currency transactions are included in other (expense) income in the consolidated statements of operations. For the years ended December 31, 2023, 2022 and 2021, we reported a (loss) gain of $(0.1) million, $0.1 million and $0.9 million, respectively, resulting from currency transactions in our consolidated statements of operations.

Segment Information

Segment Information

Operating segments are defined as components of an entity for which discrete financial information is available that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual

segment and in assessing performance. Our Chief Executive Officer is the CODM. The CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, management has determined that we operate in one operating segment that is focused on the discovery, development, and commercialization of innovative vaccines. Net assets outside of the U.S. were less than 10% of total net assets as of December 31, 2023 and 2022.

Cash and Cash Equivalents and Marketable Securities

Cash and Cash Equivalents and Marketable Securities

We consider all liquid investments purchased with an original maturity of three months or less and that can be liquidated without prior notice or penalty to be cash equivalents. Management determines the appropriate classification of marketable securities at the time of purchase. In accordance with our investment policy, we invest in short-term money market funds, U.S. treasuries, U.S. government agency securities and corporate debt securities. We believe these types of investments are subject to minimal credit and market risk.

We have classified our entire investment portfolio as available-for-sale and available for use in current operations and accordingly have classified all investments as short-term. Available-for-sale securities are carried at fair value based on inputs that are observable, either directly or indirectly, such as quoted market prices for similar securities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the securities, with unrealized gains and losses included in accumulated other comprehensive loss in stockholders’ equity. Commencing with our adoption of (“ASC”) 326, Financial Instruments — Credit Losses (“ASC 326") on January 1, 2023, we determine whether a decline in the fair value of our available-for-sale ("AFS") debt securities below their amortized cost basis (i.e., an impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in other comprehensive income (loss), net of applicable taxes. Credit-related impairments (if any) are recognized as an allowance on the balance sheet with a corresponding adjustment to earnings. Both the allowance and the adjustment to net income can be reversed if conditions change. To date, there have been no declines in fair value that have been identified as a credit-related impairment.

Concentration of Credit Risk and Other Risks and Uncertainties

Concentration of Credit Risk and Other Risks and Uncertainties

Financial instruments that are subject to concentration of credit risk consist primarily of cash equivalents, marketable securities and accounts receivable.

Our policy is to invest cash in institutional money market funds and marketable securities of the U.S. government and corporate issuers with high credit quality to limit the amount of credit exposure. We currently maintain a portfolio of cash equivalents and marketable securities in a variety of securities, including short-term money market funds, U.S. treasuries, U.S. government agency securities and corporate debt securities. We have not experienced any significant losses on our cash equivalents and marketable securities.

Our accounts receivable balance consists, primarily, of amounts due from product sales. Accounts receivable are recorded net of reserves for chargebacks, distribution fees, trade discounts and doubtful accounts. We estimate our allowance for doubtful accounts based on an evaluation of the aging of our receivables. Accounts receivable balances are written off against the allowance when it is probable that the receivable will not be collected. During the year ended December 31, 2023, we recorded an allowance for doubtful accounts of $12.3 million, which was determined by assessing changes in Biological E. Limited's (“Bio E”) credit risk, contemplation of ongoing negotiations relating to Bio E Amendment No. 3 (See Note 9), and Bio E's dependence on cash collections from the Government of India, which have been delayed and significantly reduced in connection with the overall reduction in demand for CORBEVAX from the Government of India. As of December 31, 2023 and 2022, three customers collectively represented approximately 81% and 78% of our HEPLISAV-B trade receivable balance, respectively. As of December 31, 2023, we had no CpG 1018 adjuvant trade receivable balance. As of December 31, 2022, one customer represented approximately 100% of our CpG 1018 adjuvant trade receivable balance.

Our product candidates will require approval from the United States Food and Drug Administration ("FDA") and foreign regulatory agencies before commercial sales can commence. There can be no assurance that our product candidates will receive any of these required approvals. The denial or delay of such approvals may have a material adverse impact on our business and may impact our business in the future. In addition, after the approval of HEPLISAV-B by the FDA, there is still an ongoing risk of adverse events that did not appear during the drug approval process that could affect our authorizations in the future.

We are subject to risks common to companies in the biopharmaceutical industry, including, but not limited to, new technological innovations, clinical development risk, establishment of appropriate commercial partnerships, protection of proprietary technology, compliance with government and environmental regulations, uncertainty of market acceptance of product candidates, product liability, the volatility of our stock price and the need to obtain additional financing.

Our long-lived assets located in the United States as of December 31, 2023 and 2022, represented 31% and 34% of our total assets, respectively, and the remaining long-lived assets were located in Germany.

Inventories, net

Inventories

HEPLISAV-B Inventories

Inventory is stated at the lower of cost or estimated net realizable value, on a first-in, first-out, or FIFO, basis. We primarily use actual costs to determine our cost basis for inventories. Our assessment of market value requires the use of estimates regarding the net realizable value of our inventory balances, including an assessment of excess or obsolete inventory. We determine excess or obsolete inventory based on multiple factors, including an estimate of the future demand for our products, product expiration dates and current sales levels. Our assumptions of future demand for our products are inherently uncertain and if we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of inventory reserves that we report in a particular period. For the years ended December 31, 2023 and 2022, there were no inventory reserves or write-offs recognized.

We consider regulatory approval of product candidates to be uncertain and product manufactured prior to the required regulatory approval may not be sold unless regulatory approval is obtained. As such, the manufacturing costs for product candidates incurred prior to regulatory approval are not capitalized as inventory. Instead, those are expensed as research and development costs. We begin capitalization of these inventory related costs once regulatory approval is obtained.

CpG 1018 Adjuvant Inventories

Inventory is stated at the lower of cost or estimated net realizable value, on a first-in, first-out, or FIFO, basis. We primarily use actual costs to determine our cost basis for inventories. Our assessment of market value requires the use of estimates regarding the net realizable value of our inventory balances, including an assessment of excess or obsolete inventory. We determine excess or obsolete inventory based on multiple factors, including an estimate of the future demand for our products, product expiration dates and current sales levels. Our assumptions of future demand for our products are inherently uncertain and if we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of inventory reserves that we report in a particular period. For the year ended December 31, 2023, there was no remaining CpG 1018 adjuvant inventory balance. For the year ended December 31, 2022, we recorded $34.3 million of inventory write-off to cost of sales - product, in connection with cancelled orders and the reduction in demand for CpG 1018 adjuvant reflected in the Clover Supply Agreement, as amended (See Note 9).

Long-Lived Assets

Long-Lived Assets

Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets. Additions, major renewals and improvements are capitalized, while repair and maintenance costs are charged to expense as incurred. Leasehold improvements are amortized over the remaining life of the initial lease term or the estimated useful lives of the assets, whichever is shorter.

We evaluate the carrying value of long-lived assets, whenever events or changes in business circumstances or our planned use of long-lived assets indicate, based on undiscounted future operating cash flows, that their carrying amounts may not be fully recoverable or that their useful lives are no longer appropriate. When an indicator of impairment exists, undiscounted future operating cash flows of long-lived assets are compared to their respective carrying value. If the carrying value is greater than the undiscounted future operating cash flows of long-lived assets, the long-lived assets are written down to their respective fair values and an impairment loss is recorded. Fair value is determined primarily using the discounted cash flows expected to be generated from the use of assets. Significant management judgment is required in the forecast of future operating results that are used in the preparation of expected cash flows. There have been no material adjustments to these estimates during the years presented.

Leases

Leases

We determine if an arrangement is or contains a lease at inception by assessing whether the arrangement contains an identified asset, and whether we have the right to control the identified asset. Operating leases are included in operating lease right-of-use (“ROU”) assets, other current liabilities and long-term portion of lease liabilities in our consolidated balance sheets. ROU assets represent our right to use an underlying asset for the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. The classification of our leases as operating or finance leases along with the initial measurement and recognition of the associated ROU assets and lease liabilities is performed at the lease commencement date. The measurement of ROU assets and lease liabilities is based on the present value of future lease payments over the lease term. The ROU asset also includes the effect of any lease payments made prior to or on lease commencement and excludes lease incentives and initial direct costs incurred, as applicable.

As the implicit rate in our leases is generally unknown, we use our incremental borrowing rate based on information available at the lease commencement date in determining the present value of future lease payments. We consider our credit risk, term of the lease, total lease payments and adjust for the impacts of collateral, as necessary, when calculating our incremental borrowing rate. The lease terms may include options to extend or terminate the lease when it is reasonably certain we will exercise any such options. Rent expense for our operating leases is recognized on a straight-line basis over the lease term. Variable lease payments are recorded as an expense in the period incurred.

We have elected not to apply the recognition requirements of Accounting Standards Codification ASC 842, Leases ("ASC 842"), for short-term leases. We have also elected the practical expedient to not separate lease components from non-lease components.

As lessors, we determine if an arrangement includes a lease at inception. We elected the practical expedient to not separate lease components from non-lease components. Sublease income is recognized on a straight-line basis over the expected lease term and is included in other income (expense) in our consolidated statements of operations.

Goodwill

Goodwill

Goodwill represents the excess purchase price over the fair value of tangible and intangible assets acquired and liabilities assumed. Our goodwill balance relates to our acquisition of Dynavax GmbH in 2006. Goodwill is not amortized, but instead is reviewed for impairment test at least annually, or more frequently if events occur or circumstances change that would indicate the carrying amount may be impaired. Goodwill is assigned to, and impairment testing is performed at, the reporting unit level. We determined that we have only one operating segment and there are no components of that operating segment that are deemed to be separate reporting units, such that we have one reporting unit for purposes of our goodwill impairment testing. No impairment has been identified for the years presented.

Convertible Notes

Convertible Notes

We account for our 2.50% convertible senior notes due in 2026 (“Convertible Notes”), as a long-term liability equal to the proceeds received from issuance, including the embedded conversion feature, net of the unamortized debt issuance and offering costs on the consolidated balance sheets (See Note 10). We evaluate all conversion, repurchase and redemption features contained in a debt instrument to determine if there are any embedded features that require bifurcation as a derivative. The conversion feature is not required to be accounted for separately as an embedded derivative. We amortize debt issuance and offering costs over the contractual term of the Convertible Notes, using the effective interest method, as interest expense on the consolidated statements of operations.

Capped Calls

Capped Calls

We evaluate financial instruments under ASC 815, Derivatives and Hedging ("ASC 815"). The capped calls purchased in connection with the Convertible Notes financing ("Capped Calls") cover the same number of shares of common stock that initially underlie the Convertible Notes (subject to anti-dilution and certain other adjustments). The Capped Calls meet the definition of derivative under ASC 815. In addition, the Capped Calls meet the conditions in ASC 815 to be classified in stockholders’ equity and are not subsequently remeasured as long as the conditions for the equity classification continue to be met.

Revenue Recognition

Revenue Recognition

We recognize revenue when the customer obtains control of promised goods or services, in an amount that reflects the consideration, which we expect to receive in exchange for those goods or services. To determine revenue recognition for arrangements that we determine are within the scope of ASC 606, Revenue from Contracts with Customers ("ASC 606"), we apply the following five step model:

•identify the contract(s) with a customer;

•identify the performance obligation(s) in the contract;

•determine the transaction price;

•allocate the transaction price to the performance obligation(s) in the contract; and

•recognize revenue when (or as) we satisfy a performance obligation.

Product Revenue, Net – HEPLISAV-B

We sell HEPLISAV-B to a limited number of wholesalers and specialty distributors in the U.S. (collectively, our “Customers”).

Revenues from product sales are recognized when we have satisfied our performance obligation, which is the transfer of control of our product upon delivery to the Customer. The timing between the recognition of revenue for product sales and the receipt of payment is not significant. Because our standard credit terms are short-term and we expect to receive payment in less than one-year, there is no significant financing component on the related receivables. Taxes collected from Customers relating to product sales and remitted to governmental authorities are excluded from revenues. Since our performance obligation is part of a contract that has an original expected duration of one year or less, we elect not to disclose the information about our remaining performance obligations.

Overall, product revenue, net - HEPLISAV-B, reflects our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of variable consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment.

Reserves for Variable Consideration

Revenues from product sales are recorded at the net sales price, which includes estimates of variable consideration such as product returns, chargebacks, discounts, rebates and other fees that are offered within contracts between us and our Customers, healthcare providers, pharmacies and others relating to our product sales. We estimate variable consideration using either the most likely amount method or the expected value method, depending on the type of variable consideration and what method better predicts the amount of consideration we expect to receive. We take into consideration relevant factors such as industry data, current contractual terms, available information about Customers’ inventory, resale and chargeback data and forecasted customer buying and payment patterns, in estimating each variable consideration. The variable consideration is recorded at the time product sales is recognized, resulting in a reduction in product revenue and a reduction in accounts receivable (if the Customer offsets the amount against its accounts receivable) or as an accrued liability (if we pay the amount through our accounts payable process). Variable consideration requires significant estimates, judgment and information obtained from external sources. The amount of variable consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment. If we were to change any of these judgments or estimates, it could cause a material increase or decrease in the amount of revenue that we report in a particular period. We evaluate our estimates of variable considerations including, but not limited to, product returns, chargebacks and rebates, periodically or when there is an event or change in circumstances that may indicate that our estimates may change.

Product Returns: Consistent with industry practice, we offer our Customers a limited right of return based on the product’s expiration date for product that has been purchased from us. We estimate the amount of our product sales that may be returned by our Customers and record this estimate as a reduction of revenue in the period the related product revenue is recognized. We consider several factors in the estimation of potential product returns including expiration dates of the product shipped, the limited product return rights, available information about Customers’ inventory and other relevant factors.

Chargebacks: Our Customers subsequently resell our product to healthcare providers, pharmacies and others. In addition to distribution agreements with Customers, we enter into arrangements with qualified healthcare providers that provide for chargebacks and discounts with respect to the purchase of our product. Chargebacks represent the estimated obligations resulting from contractual commitments to sell product to qualified healthcare providers at prices lower than the list prices charged to Customers who directly purchase the product from us. Customers charge us for the difference between what they pay for the product and the ultimate selling price to the qualified healthcare providers. These reserves are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue and accounts receivable. Chargeback amounts are determined at the time of resale to the qualified healthcare providers by Customers, and we issue credits for such amounts generally within a few weeks of the Customer’s notification to us of the resale. Reserves for chargebacks consists of credits that we expect to issue for units that remain in the distribution channel inventories at each reporting period end that we expect will be sold to the qualified healthcare providers, and chargebacks for units that our Customers have sold to the qualified healthcare providers, but for which credits have not been issued.

Trade Discounts and Allowances: We provide our Customers with discounts which include early payment incentives that are explicitly stated in our contracts, and are recorded as a reduction of revenue in the period the related product revenue is recognized.

Distribution Fees: Distribution fees include fees paid to certain Customers for sales order management, data and distribution services. Distribution fees are recorded as a reduction of revenue in the period the related product revenue is recognized.

Rebates: Under certain contracts, Customers may obtain rebates for purchasing minimum volumes of our product. We estimate these rebates based upon the expected purchases and the contractual rebate rate and record this estimate as a reduction in revenue in the period the related revenue is recognized.

Product Revenue, Net – CpG 1018 Adjuvant

We also sell our innovative adjuvant, CpG 1018 adjuvant, to our collaboration partners for use in their development and/or commercialization of COVID-19 vaccine. We have determined that our collaboration partners meet the definition of Customers under ASC 606. Therefore, we accounted for our CpG 1018 adjuvant sales under ASC 606. Revenues from product sales are recognized when we have satisfied our performance obligation, which is the transfer of control of our product to the customer. Because the timing between the recognition of revenue for product sales and the receipt of payment is less than one year, there is no significant financing component on the related receivables. Since our performance obligation is part of a contract that has an original expected duration of one year or less, we elect not to disclose the information about our remaining performance obligations.

Overall, product revenue, net - CpG 1018 adjuvant, reflects our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of consideration is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. If our estimates differ significantly from actuals, we will record adjustments that would affect product revenue, net in the period of adjustment. Our CpG 1018 adjuvant customers have purchased a significant quantity of CpG 1018 adjuvant as part of their initial COVID-19 vaccine development inventory. Accordingly, we did not recognize CpG 1018 adjuvant net product revenue during the year ended December 31, 2023.

Other Revenue

Other revenue includes revenue from our agreement with the DoD, collaboration and manufacturing service revenue. We have entered into grant agreements, collaborative arrangements and arrangements to provide manufacturing services to other companies. Such arrangements may include promises to customers which, if capable of being distinct, are accounted for as separate performance obligations. For agreements with multiple performance obligations, we allocate estimated revenue to each performance obligation at contract inception based on the estimated transaction price of each performance obligation. Revenue allocated to each performance obligation is then recognized when we satisfy the performance obligation by transferring control of the promised good or service to the customer.

Research and Development Expenses and Accruals

Research and Development Expenses and Accruals

Research and development expenses include personnel and facility-related expenses, outside contracted services including clinical trial costs, manufacturing and process development costs, research costs and other consulting services and

non-cash stock-based compensation. Research and development costs are expensed as incurred. Amounts due under contracts with third parties may be either fixed fee or fee for service, and may include upfront payments, monthly payments and payments upon the completion of milestones or receipt of deliverables. Non-refundable advance payments under agreements are capitalized and expensed as the related goods are delivered or services are performed.

We contract with third parties to perform various clinical trial activities in the on-going development of potential products. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows to our vendors. Payments under the contracts depend on factors such as the achievement of certain events, successful enrollment of patients, and completion of portions of the clinical trial or similar conditions. Our accrual for clinical trials is based on estimates of the services received and efforts expended pursuant to contracts with clinical trial centers and clinical research organizations. We may terminate these contracts upon written notice and we are generally only liable for actual effort expended by the organizations to the date of termination, although in certain instances we may be further responsible for termination fees and penalties. We estimate research and development expenses and the related accrual as of each balance sheet date based on the facts and circumstances known to us at that time. There have been no material adjustments to the prior period accrued estimates for clinical trial activities during the years presented.

Stock-Based Compensation

Stock-Based Compensation

Stock-based compensation expense for restricted stock units ("RSUs"), market-based performance stock units ("PSUs") and stock options is estimated at the grant date based on the award’s estimated fair value.

For awards that vest based on service conditions and market conditions, we use a straight-line method to recognize compensation expense over the award’s requisite service period, assuming estimated forfeiture rates. For awards that contain performance conditions, we determine the appropriate amount to expense at each reporting date based on the anticipated achievement of performance targets, which requires judgement, including forecasting the achievement of future specified targets. At the date performance conditions are determined to be probable of achievement, we record a cumulative expense catch-up, with remaining expense amortized over the remaining service period. Throughout the performance period, we re-assesses the estimated performance and updates the number of performance-based awards that we believe will ultimately vest.

Fair value of RSUs is determined at the date of grant using our closing stock price, with the exception of PSUs, which are measured using the Monte Carlo simulation method on the date of grant. Our determination of the fair value of stock options on the date of grant using an option-pricing model is affected by our stock price, as well as assumptions regarding a number of subjective variables. We selected the Black-Scholes option pricing model as the most appropriate method for determining the estimated fair value-based measurement of our stock options. The Black-Scholes model requires the use of subjective assumptions, which determine the fair value-based measurement of stock options. These assumptions include, but are not limited to, our expected stock price volatility over the term of the awards, and projected employee stock option exercise behaviors. In the future, as additional empirical evidence regarding these input estimates becomes available, we may change or refine our approach of deriving these input estimates. These changes could impact our fair value of stock options granted in the future. Changes in the fair value of stock awards could materially impact our operating results.

Our current estimate of volatility is based on the historical volatility of our stock price. To the extent volatility in our stock price increases in the future, our estimates of the fair value of options granted in the future could increase, thereby increasing stock-based compensation expense recognized in future periods. We derive the expected term assumption primarily based on our historical settlement experience, while considering options that have not yet completed a full life cycle. Stock-based compensation expense is recognized only for awards ultimately expected to vest. Our estimate of the forfeiture rate is based primarily on our historical experience. To the extent we revise this estimate in the future, our share-based compensation expense could be materially impacted in the period of revision. There have been no material adjustments to these estimates during the years presented.

Income Taxes

Income Taxes

The asset and liability approach is used to recognize deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities. Tax law and rate changes are reflected in income in the period such changes are enacted. We include interest and penalties related to income taxes, including unrecognized tax benefits, within income tax expense.

Our income tax returns are based on calculations and assumptions that are subject to examination by the Internal Revenue Service and other tax authorities. In addition, the calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax regulations. We recognize liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. While we believe we have appropriate support for the positions taken on our tax returns, we regularly assess the potential outcomes of examinations by tax authorities in determining the adequacy of our provision for income taxes. We continually assess the likelihood and amount of potential adjustments and adjust the income tax provision, income taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known.

Judgment is required in determining our provision for income taxes, our deferred tax assets and liabilities and the valuation allowance recorded against our net deferred tax assets. Deferred tax assets and liabilities are determined using the enacted tax rates in effect for the years in which those tax assets are expected to be realized. A valuation allowance is established when it is more likely than not the future realization of all or some of the deferred tax assets will not be achieved. The evaluation of the need for a valuation allowance is performed on a jurisdiction-by-jurisdiction basis and includes a review of all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations.

Based on all available evidence, both positive and negative, and the weight of that evidence to the extent such evidence can be objectively verified, we believe that recognition of the deferred tax assets arising from future tax benefits is currently not more likely than not to be realized and, accordingly, we have determined a need for a full valuation allowance.
 

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Accounting Standards Update 2016-13

In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments, which was codified in Accounting Standards Codification ASC 326, Financial Instruments — Credit Losses. The standard changes the methodology for measuring credit losses on financial instruments and the timing of when such losses are recorded. Because we were a smaller reporting company based on the most recent determination as of November 15, 2019, ASC 326 became effective for us for fiscal years beginning after December 15, 2022. As such, we adopted ASC 326 effective January 1, 2023, utilizing the modified retrospective transition method. Upon adoption, we updated our impairment model to utilize a forward-looking current expected credit losses (“CECL”) model in place of the incurred loss methodology for financial instruments measured at amortized cost, primarily including our accounts receivable and contract asset. In relation to AFS debt securities, the guidance eliminates the concept of “other-than-temporary” impairment, and instead focuses on determining whether any impairment is a result of a credit loss or other factors. The adoption of ASC 326 did not have a material impact on our consolidated financial statements as of the adoption date.

In November 2023, FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires public entities to disclose information about their reportable segments’ significant expenses and other segment items on an interim and annual basis. Public entities with a single reportable segment are required to apply the disclosure requirements in ASU 2023-07, as well as all existing segment disclosures and reconciliation requirements in ASC 280 on an interim and annual basis. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. We are currently evaluating the impact of adopting ASU 2023-07.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires public entities, on an annual basis, to provide disclosure of specific categories in the rate reconciliation, as well as disclosure of income taxes paid disaggregated by jurisdiction. ASU 2023-09 is effective for fiscal

years beginning after December 15, 2024, with early adoption permitted. We are currently evaluating the impact of adopting ASU 2023-09.

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table represents the fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis (in thousands):

	Level 1		Level 2		Level 3		Total
December 31, 2023
Assets
Money market funds	$	131,635	$	-	$	-	$	131,635
U.S. treasuries		-		74,237		-		74,237
U.S. government agency securities		-		216,688		-		216,688
Corporate debt securities		-		308,552		-		308,552
Total assets	$	131,635	$	599,477	$	-	$	731,112
	Level 1		Level 2		Level 3		Total
December 31, 2022
Assets
Money market funds	$	172,418	$	-	$	-	$	172,418
U.S. treasuries		-		42,308		-		42,308
U.S. government agency securities		-		88,032		-		88,032
Corporate debt securities		-		292,051		-		292,051
Total assets	$	172,418	$	422,391	$	-	$	594,809

Summary of Changes in Fair Value Warrant liability

The following table provides a summary of changes in the fair value warrant liability for year ended December 31, 2022 (in thousands):

Balance at December 31, 2021	$	18,016
Decrease in fair value of warrants exercised		(1,801	)
Warrants exercised or expired		(16,215	)
Balance at December 31, 2022	$	-

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Cash, Cash Equivalents, Restricted Cash and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2023

Cash, Cash Equivalents, and Short-Term Investments [Abstract]

Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows (in thousands):

	December 31,
	2023		2022		2021
Cash and cash equivalents	$	150,279	$	202,004	$	436,189
Restricted cash (1)		277		207		219
Total cash and cash equivalents, and restricted cash shown in the    consolidated statements of cash flows	$	150,556	$	202,211	$	436,408

(1) Restricted cash is included in "Other assets" in the Consolidated Balance Sheets.

Summary of Cash, Cash Equivalents and Marketable Securities

Cash and cash equivalents, and marketable securities consist of the following (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
December 31, 2023
Cash and cash equivalents:
Cash	$	11,190	$	-	$	-		$	11,190
Money market funds		131,635		-		-			131,635
Corporate debt securities		7,453		1		-			7,454
Total cash and cash equivalents		150,278		1		-			150,279
Marketable securities available-for-sale:
U.S. treasuries		74,109		172		(44	)		74,237
U.S. government agency securities		216,265		692		(269	)		216,688
Corporate debt securities		300,803		315		(20	)		301,098
Total marketable securities available-for-sale		591,177		1,179		(333	)		592,023
Total cash and cash equivalents, and marketable securities	$	741,455	$	1,180	$	(333	)	$	742,302
December 31, 2022
Cash and cash equivalents:
Cash	$	29,586	$	-	$	-		$	29,586
Money market funds		172,418		-		-			172,418
Total cash and cash equivalents		202,004		-		-			202,004
Marketable securities available-for-sale:
U.S. treasuries		42,502		-		(194	)		42,308
U.S. government agency securities		88,429		-		(397	)		88,032
Corporate debt securities		292,865		12		(826	)		292,051
Total marketable securities available-for-sale		423,796		12		(1,417	)		422,391
Total cash and cash equivalents, and marketable securities	$	625,800	$	12	$	(1,417	)	$	624,395

Maturities of Marketable Securities Available-for-Sale

The maturities of our marketable securities available-for-sale are as follows (in thousands):

.	December 31, 2023
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	440,131	$	440,104
Mature after one year through two years		151,046		151,919
	$	591,177	$	592,023

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Inventories, Net (Tables)

12 Months Ended

Dec. 31, 2023

Inventory Disclosure [Abstract]

Summary of Inventories

The following table presents inventories (in thousands):

	December 31,
	2023		2022
Raw materials	$	27,256	$	25,517
Work-in-process		18,954		23,934
Finished goods		7,080		9,995
Total	$	53,290	$	59,446

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Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Component of Property and Equipment, Net

Property and equipment consist of the following (in thousands):

	Estimated Useful	December 31,
	Life (In years)	2023			2022
Manufacturing equipment	5-13	$	15,752		$	15,139
Lab equipment	5-13		2,827			2,360
Computer equipment	3		5,060			4,720
Furniture and fixtures	3-13		2,467			2,464
Leasehold improvements	2-12		37,201			28,822
Assets in progress			5,822			11,613
			69,129			65,118
Less accumulated depreciation and amortization			(31,832	)		(27,522	)
Total		$	37,297		$	37,596

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Current Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2023

Disclosure Component Of Current Accrued Liabilities And Accrued Research And Development [Abstract]

Component of Current Accrued Liabilities

Current accrued liabilities consist of the following (in thousands):

	December 31,
	2023		2022
Payroll and related expenses	$	17,069	$	14,261
Revenue reserve accruals		21,004		10,552
Accrued inventory		4,456		2,209
Other accrued liabilities		6,919		3,697
Total	$	49,448	$	30,719

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Summary of Operating Lease Expense

Our lease expense comprises of the following (in thousands):

	Year Ended December 31,
	2023		2022		2021
Operating lease expense	$	5,563	$	6,222	$	6,265

Summary of Balance Sheet Classification of Operating Lease Liabilities

The balance sheet classification of our operating lease liabilities was as follows (in thousands):

	December 31,
	2023		2022
Operating lease liabilities:
Current portion of lease liabilities (included in other current liabilities)	$	4,496	$	3,631
Long-term portion of lease liabilities		29,720		32,801
Total operating lease liabilities	$	34,216	$	36,432

Summary of Maturities of Sublease Income and Operating Lease Liabilities

As of December 31, 2023, the maturities of our sublease income and operating lease liabilities were as follows (in thousands):

Years ending December 31,	Sublease Income		Operating Lease Liabilities
2024	$	5,684	$	7,605
2025		5,854		6,980
2026		6,030		6,122
2027		6,211		6,052
2028		6,397		6,215
Thereafter		15,103		15,062
Total	$	45,279		48,036
Less:
Present value adjustment				(13,820	)
Total			$	34,216

Summary of Weighted Average Remaining Lease Term and Weighted Average Discount Rate

The weighted average remaining lease term and the weighted average discount rate used to determine the operating lease liabilities were as follows:

	December 31,
	2023			2022
Weighted average remaining lease term	6.7 years			7.6 years
Weighted average discount rate		10.1	%		10.1	%

Schedule of Material Purchase Commitments

The following summarizes our material purchase commitments at December 31, 2023 and the effect those obligations are expected to have on our liquidity and cash flows in future periods (in thousands):

Years ending December 31,	(in thousands)
2024	$	18,866
2025		11,983
2026		12,516
2027		-
2028		-
Thereafter		-
Total	$	43,365

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Convertible Notes (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Summary of Interest Expenses Related to Convertible Notes

The following table presents the components of interest expense related to Convertible Notes (in thousands):

	Year Ended December 31,
	2023		2022
Stated coupon interest	$	5,636	$	5,638
Amortization of debt issuance cost		1,121		1,094
Total interest expense	$	6,757	$	6,732

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Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2023

Summary of Disaggregation of Revenues

The following table disaggregates our product revenue, net by product and geographic region and disaggregates our other revenues by geographic region (in thousands):

	Year Ended						Year Ended						Year Ended
	December 31, 2023						December 31, 2022						December 31, 2021
	U.S.		Non U.S.		Total		U.S.		Non U.S.		Total		U.S.		Non U.S.		Total
Product revenue, net
HEPLISAV-B	$	213,295	$	-	$	213,295	$	124,996	$	941	$	125,937	$	61,870	$	-	$	61,870
CpG 1018 adjuvant		-		-		-		-		587,708		587,708		-		375,229		375,229
Total product revenue, net	$	213,295	$	-	$	213,295	$	124,996	$	588,649	$	713,645	$	61,870	$	375,229	$	437,099
Other revenue		17,650		1,339		18,989		8,774		264		9,038		1,915		428		2,343
Total revenues	$	230,945	$	1,339	$	232,284	$	133,770	$	588,913	$	722,683	$	63,785	$	375,657	$	439,442

HEPLISAV-B

Schedule of Revenues from Major Customers

The following table summarizes HEPLISAV-B product revenue from each of our three largest customers (as a percentage of total HEPLISAV-B net product revenue):

	Year Ended
	December 31,
	2023			2022			2021
Largest customer		28	%		21	%		21	%
Second largest customer		27	%		17	%		19	%
Third largest customer		17	%		16	%		19	%

Summary of Product Revenue Allowance and Reserve Categories

The following table summarizes balances and activities in HEPLISAV-B product revenue allowance and reserve categories (in thousands):

	Balance at Beginning of Period		Provisions related to current period sales		Credit or payments made during the period			Adjustments related to prior periods			Balance at End of Period
Year ended December 31, 2023:
Accounts receivable reserves (1)	$	8,179	$	55,604	$	(54,143	)	$	(2,629	)	$	7,011
Revenue reserve accruals (2)	$	10,552	$	46,062	$	(38,207	)	$	2,597		$	21,004
Year ended December 31, 2022:
Accounts receivable reserves (1)	$	3,823	$	34,758	$	(30,402	)	$	-		$	8,179
Revenue reserve accruals (2)	$	8,253	$	24,806	$	(22,507	)	$	-		$	10,552

(1) Reserves are for chargebacks, discounts and other fees.

(2) Accruals are for returns, rebates and other fees.

CpG 1018

Schedule of Revenues from Major Customers

The following table summarizes CpG 1018 adjuvant product revenue from each of our three largest collaboration partners (as a percentage of total CpG 1018 adjuvant product revenue):

	Year Ended
	December 31,
	2023			2022			2021
Largest collaboration partner		0	%		49	%		49	%
Second largest collaboration partner		0	%		35	%		24	%
Third largest collaboration partner		0	%		12	%		19	%

Summary of balances and activities in our contract asset account

The following table summarizes balances and activities in our contract asset account (in thousands):

	Balance at Beginning of Period		Additions		Subtractions			Reclassification (1)			Balance at End of Period
Year ended December 31, 2023:
Contract asset, included in other current assets (2)	$	71,965	$	17,650	$	(16,919	)	$	(71,307	)	$	1,389
Contract asset, included in other assets (long term)	$	-	$	-	$	-		$	71,307		$	71,307
Year ended December 31, 2022:
Contract asset	$	62,525	$	17,556	$	(8,116	)	$	-		$	71,965

(1) The Clover contract asset was reclassified to long term assets to reflect the timing of expected long term demand for CpG 1018 adjuvant for Clover Product. See Note 9 for further discussion.

(2) The $1.4 million of contract asset is derived from our agreement with the DoD.

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Net (Loss) Income Per Share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Loss Per Share

The numerators and denominators of the basic net (loss) income and diluted net income per share computations for our common stock are calculated as follows (in thousands):

	Year Ended
	December 31,
	2023			2022			2021
Numerator
Net (loss) income	$	(6,389	)	$	293,156		$	76,713
Less: undistributed earnings allocated to participating securities					(283	)		(4,569	)
Net (loss) income allocable to common stockholders, basic		(6,389	)		292,873			72,144
Add: undistributed earnings allocated to Series B and warrants		-			283			4,569
Less: undistributed earnings allocated to Series B and warrants		-			-			(4,190	)
Add: interest expense on convertible notes		-			5,044			3,168
Less: removal of change in fair value of warrant liability		-			(1,801	)		-
Net (loss) income allocable to common stockholders, diluted	$	(6,389	)	$	296,399		$	75,691
Denominator
Weighted average shares used to compute net (loss) income    allocable to common stockholders per share, basic		128,733			126,398			116,264
Effect of dilutive shares:
Stock-based compensation plans		-			2,774			3,075
Convertible Notes (as converted to common stock)		-			21,543			13,667
Effect of dilutive warrants		-			82			-
Weighted average shares used to compute net (loss) income    allocable to common stockholders per share, diluted		128,733			150,797			133,006

Outstanding Stock Options and Stock Awards Excluded from Calculation of Net Loss Per Share

The following were excluded from the calculation of diluted net (loss) income per share as the effect of their inclusion would have been anti-dilutive (in thousands).

	December 31,
	2023		2022		2021
Outstanding securities not included in diluted net (loss) income    allocable to common stockholders per share calculation    (in thousands):
Stock options and stock awards		15,158		7,165		5,953
Convertible Notes (as converted to common stock)		21,543		-		-
Warrants (as exercisable into common stock)		-		-		1,883

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Equity Plans and Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Summary of Option Activity Under Stock-Based Compensation Plans

The following table summarizes the activity of stock options for the year ended December 31, 2023:

	Shares Underlying Outstanding Options (in thousands)			Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2022		9,339		$	10.70		4.61	$	16,291
Options granted		1,982			11.17
Options exercised		(850	)		7.48
Options cancelled:
Options forfeited (unvested)		(90	)		10.93
Options expired (vested)		(261	)		21.39
Balance at December 31, 2023		10,120		$	10.78		4.18	$	37,388
Vested and expected to vest at December 31, 2023		9,976		$	10.77		4.15	$	37,024
Exercisable at December 31, 2023		7,014		$	10.40		3.50	$	29,613

Summary of Non-vested Restricted Stock Units Activity

The following table summarizes the activity of RSUs for the year ended December 31, 2023:

	Number of Shares (In thousands)			Weighted-Average Grant-Date Fair Value
Non-vested as of December 31, 2022		3,479		$	11.00
Granted		2,748			11.48
Vested (1)		(1,515	)		10.13
Forfeited		(267	)		11.45
Non-vested as of December 31, 2023		4,445		$	11.57

(1) Inclusive of approximately 600,145 RSUs for the year ended December 31, 2023, which were not converted into shares due to net share settlement in order to cover the required amount of employee withholding taxes. The value of the withheld shares was classified as a reduction to additional paid-in capital.

Summary of Performance Based Restricted Stock Unit

The summary of PSU activities for the year ended December 31, 2023 is as follows:

	Number of Shares (in thousands)		Weighted-Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2022		193	$	11.62
Granted		364		18.25
Non-vested as of December 31, 2023		557	$	15.95

Summary of Fair Value-Based Measurements and Weighted-Average Assumptions

The weighted-average assumptions used in the calculations of these fair value measurements are as follows:

	Stock Options									Market-Based Performance Stock Units								Employee Stock Purchase Plan
	Year Ended December 31,									Year Ended December 31,								Year Ended December 31,
	2023			2022			2021			2023			2022			2021		2023			2022			2021
Weighted-average fair value	$	7.32		$	7.95		$	7.17		$	18.25		$	11.62		$	8.40	$	5.35		$	7.37		$	6.48
Risk-free interest rate		4.0	%		2.0	%		0.7	%		4.3	%		1.7	%	From 0.03% to 1.92%			4.9	%		2.1	%		0.1	%
Expected life (in years)		4.5			4.5			4.5			2.9			2.9			2.9		1.3			1.3			1.2
Expected volatility		0.8			0.8			0.9			0.9			0.9			0.9		0.7			1.0			1.0

Summary of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense recorded in each component of operating expenses in our consolidated statements of operations, and amounts capitalized to our inventories (in thousands):

	Year Ended December 31,
	2023		2022		2021
Employees and directors stock-based compensation expense	$	42,592	$	32,915	$	21,285
	Year Ended December 31,
	2023		2022		2021
Research and development	$	9,285	$	5,954	$	3,818
Selling, general and administrative		29,069		23,118		14,894
Cost of sales - product		1,839		1,123		553
Inventories		2,399		2,720		2,020
Total	$	42,592	$	32,915	$	21,285

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Component of Consolidated (Loss) Income Before Provision for Income Taxes

Consolidated (loss) income before provision for income taxes consisted of the following (in thousands):

	Year Ended December 31,
	2023			2022		2021
U.S.	$	(6,275	)	$	292,460	$	75,954
Non U.S.		1,908			1,839		1,567
Total	$	(4,367	)	$	294,299	$	77,521

Components of Income Tax Provision

The components of the consolidated income tax provision for the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31, 2023			Year Ended December 31, 2022			Year Ended December 31, 2021
Current
Federal	$	(178	)	$	(165	)	$	345
State		1,533			897			260
Non-US		667			411			203
Total current tax expense		2,022			1,143			808
Deferred
Federal		-			-			-
State		-			-			-
Non-US		-			-			-
Total deferred tax expense		-			-			-
Total income tax expense	$	2,022		$	1,143		$	808

Difference Between Consolidated Income Tax Benefit and Amount Computed by Federal Statutory Income Tax Rate

The difference between the consolidated income tax provision and the amount computed by applying the federal statutory income tax rate to the consolidated income before income taxes in the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Income tax provision (benefit) at federal statutory rate	$	(917	)	$	61,775		$	16,397
State tax		574			(2,942	)		3,576
Business credits		(2,050	)		(3,246	)		(982	)
Uncertain tax positions		334			586			424
Deferred compensation charges		830			(473	)		131
Change in valuation allowance		1,466			(324	)		(86,847	)
Section 162(m) limitation		1,963			1,779			1,241
Mark-to-market of warrants		-			(378	)		10,364
Net operating loss and tax credit limitation		-			(56,908	)		56,459
Other (1)		(518	)		879			(290	)
Foreign taxes		340			395			335
Total income tax expense	$	2,022		$	1,143		$	808

(1) Certain prior year amounts have been reclassified to conform to the current year presentation. In 2022 and 2021, Foreign taxes were included in Other.

Component of Deferred Tax Assets and Liabilities

Deferred tax assets and liabilities consisted of the following (in thousands):

	December 31,
	2023			2022
Deferred tax assets:
Net operating loss carryforwards	$	96,336		$	113,228
Research credit carryforwards		34,940			33,444
Section 174 capitalization		22,556			15,308
Lease liability		8,868			9,530
Stock compensation		10,572			7,780
Accruals and reserves		15,808			9,089
Other		348			337
Total deferred tax assets		189,428			188,716
Less valuation allowance		(180,387	)		(178,920	)
Net deferred tax assets		9,041			9,796
Deferred tax liabilities:
Fixed assets		(2,667	)		(2,916	)
Operating lease right-of-use assets		(6,345	)		(6,785	)
Other		(29	)		(95	)
Total deferred tax liabilities		(9,041	)		(9,796	)
Net deferred tax assets	$	-		$	-

Schedule of Unrecognized Tax Benefits

The following table summarizes the activity related to our unrecognized tax benefits:

	Year Ended December 31,
	2023			2022
Balance at beginning of year	$	(11,339	)	$	(5,615	)
Tax positions related to the current year
Additions		(762	)		(670	)
Reductions		-			-
Tax positions related to the prior year
Additions		-			(5,054	)
Reductions		-			-
Settlements		-			-
Lapses in statute					-
Balance at end of year	$	(12,101	)	$	(11,339	)

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Organization - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023
HEPLISAV-B
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Minimum age approved for vaccine prevention of infection caused	18 years

XML

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of operating segment | Segment	1
Unrealized foreign currency translation (loss) gain	$ 1,100	$ (1,800)	$ (2,500)
Realized foreign currency translation (loss) gain	$ (100)	$ 100	900
Percentage of long lived assets	31.00%	34.00%
Inventory write-off	$ 0	$ 34,288	$ 2,588
Inventory write-offs recognized	34,300
Goodwill impairment	0
Allowance for doubtful accounts	$ 12,300
2.50% Convertible Senior Notes Due 2026
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Debt interest rate	2.50%
Product | Trade Receivable | Credit Concentration Risk
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Concentration risk, customer		one
Product | Trade Receivable | Customer Concentration Risk
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Concentration risk, percentage	100.00%
HEPLISAV-B
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Inventory write-off	$ 0
HEPLISAV-B | Credit Concentration Risk
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Concentration risk, customer	three	three
HEPLISAV-B | Trade Receivable | Credit Concentration Risk
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Concentration risk, percentage	81.00%	78.00%
Maximum
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cash equivalents original maturity period	3 months
Percentage of long lived assets	10.00%	10.00%
Expected period of payment to be received	1 year
Dynavax GmbH
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cumulative translation adjustment	$ (3,000)	$ (4,000)

XML

Fair Value Measurements - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers in or out of Level 3	$ 0	$ 0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of shares		1,882,600

XML

Fair Value Measurements - Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Total assets	$ 731,112	$ 594,809
Money Market Funds
Assets
Total assets	131,635	172,418
U.S. Treasuries
Assets
Total assets	74,237	42,308
U.S. Government Agency Securities
Assets
Total assets	216,688	88,032
Corporate Debt Securities
Assets
Total assets	308,552	292,051
Fair Value, Inputs, Level 1
Assets
Total assets	131,635	172,418
Fair Value, Inputs, Level 1 | Money Market Funds
Assets
Total assets	131,635	172,418
Fair Value, Inputs, Level 1 | U.S. Treasuries
Assets
Total assets	0	0
Fair Value, Inputs, Level 1 | U.S. Government Agency Securities
Assets
Total assets	0	0
Fair Value, Inputs, Level 1 | Corporate Debt Securities
Assets
Total assets	0	0
Fair Value, Inputs, Level 2
Assets
Total assets	599,477	422,391
Fair Value, Inputs, Level 2 | Money Market Funds
Assets
Total assets	0	0
Fair Value, Inputs, Level 2 | U.S. Treasuries
Assets
Total assets	74,237	42,308
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities
Assets
Total assets	216,688	88,032
Fair Value, Inputs, Level 2 | Corporate Debt Securities
Assets
Total assets	308,552	292,051
Fair Value, Inputs, Level 3
Assets
Total assets	0	0
Fair Value, Inputs, Level 3 | Money Market Funds
Assets
Total assets	0	0
Fair Value, Inputs, Level 3 | U.S. Treasuries
Assets
Total assets	0	0
Fair Value, Inputs, Level 3 | U.S. Government Agency Securities
Assets
Total assets	0	0
Fair Value, Inputs, Level 3 | Corporate Debt Securities
Assets
Total assets	$ 0	$ 0

XML

Fair Value Measurements - Summary of Assumptions to Estimate the Fair Value of Warrant Liability (Detail) shares in Thousands	Dec. 31, 2022 shares
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of shares	1,882,600

XML

Fair Value Measurements - Summary of Changes in Fair Value Warrant liability (Detail) - Fair Value, Inputs, Level 3 $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	$ 18,016
Decrease in fair value of warrants exercised	(1,801)
Warrants exercised	(16,215)
Ending Balance	$ 0

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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents		$ 150,279	$ 202,004	$ 436,189
Restricted cash	[1]	277	207	219
Total cash and cash equivalents, and restricted cash shown in the consolidated statements of cash flows		$ 150,556	$ 202,211	$ 436,408	$ 32,310

[1] Restricted cash is included in "Other assets" in the Consolidated Balance Sheets.

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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 150,278	$ 202,004
Unrealized Gains	1	0
Unrealized Losses	0	0
Estimated Fair Value	150,279	202,004
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	591,177	423,796
Unrealized Gains	1,179	12
Unrealized Losses	(333)	(1,417)
Estimated Fair Value	592,023	422,391
Marketable Securities Available-for-Sale | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	741,455	625,800
Unrealized Gains	1,180	12
Unrealized Losses	(333)	(1,417)
Estimated Fair Value	742,302	624,395
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	11,190	29,586
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	11,190	29,586
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	131,635	172,418
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	131,635	172,418
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	7,453
Unrealized Gains	1
Unrealized Losses	0
Estimated Fair Value	7,454
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	300,803	292,865
Unrealized Gains	315	12
Unrealized Losses	(20)	(826)
Estimated Fair Value	301,098	292,051
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	74,109	42,502
Unrealized Gains	172	0
Unrealized Losses	(44)	(194)
Estimated Fair Value	74,237	42,308
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	216,265	88,429
Unrealized Gains	692	0
Unrealized Losses	(269)	(397)
Estimated Fair Value	$ 216,688	$ 88,032

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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Maturities of Marketable Securities Available-for-Sale (Detail) $ in Thousands	Dec. 31, 2023 USD ($)
Amortized Cost
Mature in one year or less	$ 440,131
Mature after one year through two years	151,046
Total amortized cost	591,177
Estimated Fair Value
Mature in one year or less	440,104
Mature after one year through two years	151,919
Total estimated fair value	$ 592,023

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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-Sale, Realized Loss	$ 0	$ 0

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Inventories, Net - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Raw materials	$ 27,256	$ 25,517
Work-in-process	18,954	23,934
Finished goods	7,080	9,995
Total	$ 53,290	$ 59,446

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Inventories, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Inventory [Line Items]
Finished goods	$ 7,080	$ 9,995
Inventory write-offs recognized	$ 34,300

XML

Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite Lived Intangible Assets [Line Items]
Selling, general and administrative	$ 152,946	$ 131,408	$ 100,156

XML

Property and Equipment, Net - Component of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Manufacturing equipment	$ 15,752	$ 15,139
Lab equipment	2,827	2,360
Computer equipment	5,060	4,720
Furniture and fixtures	2,467	2,464
Leasehold improvements	37,201	28,822
Assets in progress	5,822	11,613
Property, plant and equipment, gross	69,129	65,118
Less accumulated depreciation and amortization	(31,832)	(27,522)
Total	$ 37,297	$ 37,596
Manufacturing Equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	5 years
Manufacturing Equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	13 years
Lab Equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	5 years
Lab Equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	13 years
Computer Equipment
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	3 years
Furniture and Fixtures | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	3 years
Furniture and Fixtures | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	13 years
Leasehold Improvements | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	2 years
Leasehold Improvements | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Lives (In years)	12 years

XML

Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Depreciation and amortization	$ 4,342	$ 3,812	$ 4,296

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Current Accrued Liabilities - Component of Current Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accrued Liabilities Abstract
Payroll and related expenses	$ 17,069	$ 14,261
Revenue reserve accruals	21,004	10,552
Accrued inventory	4,456	2,209
Other accrued liabilities	6,919	3,697
Total	$ 49,448	$ 30,719

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Commitments and Contingencies - Additional Information (Detail) $ in Thousands, € in Millions	1 Months Ended								12 Months Ended
	Oct. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	May 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	May 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	Jul. 31, 2019	Nov. 30, 2009 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)
Loss Contingencies [Line Items]
Lease expiration date									Mar. 31, 2031
Option to extend									The subtenant has no option to extend the sublease term.
Sublease income									$ 7,577	$ 7,685	$ 7,735
Percentage of excess rent paid to landlord									50.00%				50.00%
Cash paid for amounts included in the measurement of operating lease liabilities									$ 7,200	6,800	$ 7,000
Long-term debt discount									2,802	$ 3,922
Non-cancelable purchase and other commitments									$ 43,365
Description of Avecia Supply Agreement									On September 7, 2023 (the “Effective Date”), we entered into an agreement (the “Avecia Supply Agreement”) with Nitto Denko Avecia Inc. (“Avecia”) for the manufacture and supply of our CpG 1018 adjuvant using a specific production process. Under the Avecia Supply Agreement, Avecia has agreed to produce and supply to us quantities of CpG 1018 adjuvant ordered by us after the Effective Date. Subject to certain conditions in the Avecia Supply Agreement, we are obligated to purchase all of our annual volume requirements of CpG 1018 adjuvant from Avecia up to a specified production capacity. We may alternatively order CpG 1018 adjuvant produced using a different production process pursuant to the existing supply agreement between us and Avecia dated October 1, 2012 (the “2012 Agreement”). As of December 31, 2023, our aggregate minimum commitment for the supply of CpG 1018 adjuvant under the Avecia Supply Agreement was $7.4 million within the next 12 months. As of December 31, 2022, we had no non-cancelable purchase and other commitments for the supply of CpG 1018 adjuvant.
Aggregate minimum commitment									$ 7,400
HEPLISAV-B
Loss Contingencies [Line Items]
Non-cancelable purchase and other commitments									43,400
2.50% Convertible Senior Notes Due 2026
Loss Contingencies [Line Items]
Aggregate principal amount					$ 225,500				225,500
Long-term debt discount									$ 2,800
Symphony Dynamo Holdings Llc
Loss Contingencies [Line Items]
License arrangement contingent consideration percentage								50.00%
License arrangement upfront payment								$ 50,000
Trisalus Life Sciences
Loss Contingencies [Line Items]
Payment to holdings						$ 2,500
Payment received for pre-commercialization milestone		$ 1,000	$ 1,000	$ 1,000
Trisalus Life Sciences | Asset Purchase Agreement
Loss Contingencies [Line Items]
Payment made for pre-commercialization milestone	$ 500			$ 500	$ 500
Deutsche Bank Securities
Loss Contingencies [Line Items]
Financial instruments owned at fair value | €													€ 0.2	€ 0.2
Deutsche Bank Securities | Letter of Credit
Loss Contingencies [Line Items]
Financial instruments owned at fair value | €													€ 0.2
California
Loss Contingencies [Line Items]
Lease option to extend									Certain of these leases also include options to renew or extend the lease for two successive five-year terms.
Existence of option to extend							false
California | Maximum
Loss Contingencies [Line Items]
Initial lease term									12 years				12 years
California | Minimum
Loss Contingencies [Line Items]
Initial lease term									3 years				3 years
Powell Street Sublease | California
Loss Contingencies [Line Items]
Existence of option to extend												false

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Commitments and Contingencies - Summary of Operating Lease Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Operating lease expense	$ 5,563	$ 6,222	$ 6,265

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Commitments and Contingencies - Summary of Balance Sheet Classification of Operating Lease Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Current portion of lease liabilities (included in other current liabilities)	$ 4,496	$ 3,631
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Long-term portion of lease liabilities	$ 29,720	$ 32,801
Total operating lease liabilities	$ 34,216	$ 36,432

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Commitments and Contingencies - Summary of Maturities of Sublease Income and Operating Lease Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Sublease Income
2024	$ 5,684
2025	5,854
2026	6,030
2027	6,211
2028	6,397
Thereafter	15,103
Total	45,279
Operating Lease Liabilities
2024	7,605
2025	6,980
2026	6,122
2027	6,052
2028	6,215
Thereafter	15,062
Total	48,036
Present value adjustment	(13,820)
Total	$ 34,216	$ 36,432

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Commitments and Contingencies - Summary of Weighted Average Remaining Lease Term and Weighted Average Discount Rate (Detail)	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Weighted average remaining lease term	6 years 8 months 12 days	7 years 7 months 6 days
Weighted average discount rate	10.10%	10.10%

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Commitments and Contingencies - Schedule of Material Purchase Commitments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2024	$ 18,866
2025	11,983
2026	12,516
2027	0
2028	0
Thereafter	0
Total	$ 43,365

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Collaborative Research, Development and License Agreements - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended			12 Months Ended
	Apr. 26, 2023	Jul. 31, 2023	Apr. 30, 2023	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Aug. 31, 2023	Apr. 27, 2023
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized					$ 232,284	$ 722,683	$ 439,442
Inventory write-offs recognized					34,300
Advance payment from customer					(47,401)	0	$ 0
Repayment of advance from customer									$ 47,400
Accrued liabilities					49,448	30,719
Allowance for doubtful accounts receivables					12,313	0
Prepayment of advance payment			$ 13,500
Increase in revenue adjustment		$ 33,700
CpG 1018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Inventory write-offs recognized						34,300
CEPI
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Accounts receivable									47,400
CEPI Partners
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Advance payment from customer					175,000
Repayment of advance from customer					67,300
Accrued liabilities					47,400	107,700
Accrual long-term balance					60,300
Long-term deferred revenue					0	0
Clover
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized					0	288,000
Accrual long-term balance					60,300
Biological E. Limited
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Repayment of advance from customer	$ 47,400								$ 47,400
Advance payment received	125,000							$ 250,000
Accounts receivable								1,000
Prepayment of advance payment	14,500
Additional future payment	$ 5,500							$ 12,300
U.S. Department of Defense
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized					17,600	8,800
Proceeds from grant				$ 22,000
Supply Agreement | Clover
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contract asset balance						71,300
Supply Agreement | Biological E. Limited
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized					$ 0	$ 206,200

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Convertible Notes (Additional Information) (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2021 USD ($)	Dec. 31, 2023 USD ($) Days $ / shares shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of Convertible Notes, net		$ 0	$ 0	$ 219,822
Debt instrument, convertible, threshold trading days | Days		20
Fair value of the convertible notes		$ 330,100
2.50% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Aggregate principal amount	$ 225,500	$ 225,500
Debt interest rate		2.50%
Debt issuance and offering costs	5,700	$ 2,800
Proceeds from issuance of Convertible Notes, net	219,800
Debt instrument, interest rate terms		The Convertible Notes are general, unsecured obligations and accrue interest at a rate of 2.50% per annum payable semiannually in arrears on May 15 and November 15 of each year, beginning on November 15, 2021.
Debt maturity date		May 15, 2026
Initial conversion rate		95.5338
Debt conversion, original debt, principal amount converted		$ 1,000
Debt instrument, conversion price per share | $ / shares		$ 10.47
Debt Instrument, redemption, description		We may redeem for cash all or any portion of the Convertible Notes (subject to the partial redemption limitation described in the indenture governing the Convertible Notes), at our option, on or after May 20, 2024 and prior to the 31st scheduled trading day immediately preceding the maturity date, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on the trading day immediately preceding the date on which we provide notice of redemption, at a redemption price equal to 100% of the principal amount of the Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.
Debt instrument interest rate, effective percentage		3.10%
2.50% Convertible Senior Notes Due 2026 | Minimum
Debt Instrument [Line Items]
Debt conversion, original debt, principal amount converted		$ 1,000
2.50% Convertible Senior Notes Due 2026 | Debt Instrument, Conversion, Period One
Debt Instrument [Line Items]
Debt instrument, convertible, threshold consecutive trading days | Days		30
2.50% Convertible Senior Notes Due 2026 | Debt Instrument, Conversion, Period One | Maximum
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger		130.00%
2.50% Convertible Senior Notes Due 2026 | Debt Instrument, Conversion, Period Two
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days | Days		5
Debt instrument, convertible, threshold consecutive trading days | Days		10
2.50% Convertible Senior Notes Due 2026 | Debt Instrument, Conversion, Period Two | Maximum
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger		98.00%
Loan Agreement
Debt Instrument [Line Items]
Repayments of debt	190,200
Capped Calls
Debt Instrument [Line Items]
Net Proceeds to Pay the Costs	$ 27,200	$ 27,200
Number of shares converted | shares		21,542,871
Initial strike price | $ / shares		$ 10.47
Initial cap price | $ / shares		$ 15.8
Reduction to additional paid-in capital, capped calls cost		$ 27,200

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Convertible Notes - Summary of Interest Expenses Related to Convertible Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Stated coupon interest	$ 5,636	$ 5,638
Amortization of debt issuance cost	1,121	1,094
Total interest expense	$ 6,757	$ 6,732

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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Feb. 20, 2018	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Mar. 29, 2019
Debt Instrument [Line Items]
Debt instrument, debt discount		$ 2,802	$ 3,922
Interest expense related to initial term loan		6,757	6,732
Loss on debt extinguishment (Note 11)		0	0	$ (5,232)
Repayment of long-term debt		$ 0	$ 0	190,194
Loan Agreement
Debt Instrument [Line Items]
Interest expense related to initial term loan				7,000
CRG Servicing LLC
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 175,000
Net proceeds from the initial term loan	$ 173,300
Debt interest rate	9.50%
Debt maturity date		Dec. 31, 2023
Current borrowing capacity	$ 100,000				$ 75,000
Loss on debt extinguishment (Note 11)				$ 5,200
Repayment of long-term debt		$ 190,200

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Revenue Recognition - Summary of Disaggregation of Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 232,284	$ 722,683	$ 439,442
U.S.
Disaggregation of Revenue [Line Items]
Total revenues	230,945	133,770	63,785
Non U.S.
Disaggregation of Revenue [Line Items]
Total revenues	1,339	588,913	375,657
HEPLISAV-B
Disaggregation of Revenue [Line Items]
Total revenues	213,295	125,937	61,870
HEPLISAV-B | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	213,295	124,996	61,870
HEPLISAV-B | Non U.S.
Disaggregation of Revenue [Line Items]
Total revenues	0	941	0
CpG 1018
Disaggregation of Revenue [Line Items]
Total revenues	0	587,708	375,229
CpG 1018 | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
CpG 1018 | Non U.S.
Disaggregation of Revenue [Line Items]
Total revenues	0	587,708	375,229
Product
Disaggregation of Revenue [Line Items]
Total revenues	213,295	713,645	437,099
Product | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	213,295	124,996	61,870
Product | Non U.S.
Disaggregation of Revenue [Line Items]
Total revenues	0	588,649	375,229
Other Revenue
Disaggregation of Revenue [Line Items]
Total revenues	18,989	9,038	2,343
Other Revenue | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	17,650	8,774	1,915
Other Revenue | Non U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,339	$ 264	$ 428

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Revenue Recognition - Schedule of Revenues from Major Customers (Details) - Revenue Benchmark [Member] - Product Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Largest Customer | HEPLISAV-B
Concentration Risk [Line Items]
Percentage of product revenue	28.00%	21.00%	21.00%
Second Largest Customer | HEPLISAV-B
Concentration Risk [Line Items]
Percentage of product revenue	27.00%	17.00%	19.00%
Third Largest Customer | HEPLISAV-B
Concentration Risk [Line Items]
Percentage of product revenue	17.00%	16.00%	19.00%
Largest Collaboration Partner | CpG 1018
Concentration Risk [Line Items]
Percentage of product revenue	0.00%	49.00%	49.00%
Second Largest Collaboration Partner | CpG 1018
Concentration Risk [Line Items]
Percentage of product revenue	0.00%	35.00%	24.00%
Third Largest Collaboration Partner | CpG 1018
Concentration Risk [Line Items]
Percentage of product revenue	0.00%	12.00%	19.00%

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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Accounts Receivable Reserves
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	[1]	$ 8,179	$ 3,823
Provisions related to current period sales	[1]	55,604	34,758
Credit or payments made during the period	[1]	(54,143)	(30,402)
Adjustments related to prior periods	[1]	(2,629)	0
Balance at end of period	[1]	7,011	8,179
Revenue Reserve Accruals
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	[2]	10,552	8,253
Provisions related to current period sales	[2]	46,062	24,806
Credit or payments made during the period	[2]	(38,207)	(22,507)
Adjustments related to prior periods	[2]	2,597	0
Balance at end of period	[2]	$ 21,004	$ 10,552

[1] Reserves are for chargebacks, discounts and other fees

[2] Accruals are for returns, rebates and other fees

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Revenue Recognition - Summary of Balances and Activities in our Contract Asset Account (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022
Contract Asset Account [Abstract]
Contract asset, reclassification	[1]	$ 71,307
Balance at end of period		71,307
Cp G1018 [Member]
Contract Asset Account [Abstract]
Balance at beginning of period		71,965	[2]	$ 62,525
Contract asset, additions		17,650	[2]	17,556
Contract asset, subtractions		(16,919)	[2]	(8,116)
Contract asset, reclassification	[1],[2]	(71,307)
Balance at end of period	[2]	$ 1,389		$ 71,965

[1] The Clover contract asset was reclassified to long term assets to reflect the timing of expected long term demand for CpG 1018 adjuvant for Clover Product. See Note 9 for further discussion.

[2] The $1.4 million of contract asset is derived from our agreement with the DoD

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Net (Loss) Income Per Share- Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Computation Of Basic And Diluted Earnings Per Share [Abstract]
Net (loss) income	$ (6,389)	$ 293,156	$ 76,713
Less: undistributed earnings allocated to participating securities		(283)	(4,569)
Net (loss) income allocable to common stockholders, basic	(6,389)	292,873	72,144
Add: undistributed earnings allocated to Series B and warrants	0	283	4,569
Less: undistributed earnings allocated to Series B and warrants	0	0	(4,190)
Add: interest expense on convertible notes	0	5,044	3,168
Less: removal of change in fair value of warrant liability	(0)	(1,801)	0
Net income (loss) allocable to common stockholders, diluted	$ (6,389)	$ 296,399	$ 75,691
Weighted-average shares used in computing basic net (loss) income per share allocable to common stockholders	128,733	126,398	116,264
Stock-based compensation expense	$ 0	$ 2,774	$ 3,075
Convertible Notes (as converted to common stock)	0	21,543	13,667
Effect of dilutive warrants	0	82	0
Weighted average shares used to compute net (loss) income allocable to common stockholders per share, diluted	128,733	150,797	133,006

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Net (Loss) Income Per Share - Outstanding Stock Options and Stock Awards Excluded from Calculation of Net Loss Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net (loss) income allocable to common stockholders per share calculation	0	21,543	13,667
Stock Options and Stock Awards
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net (loss) income allocable to common stockholders per share calculation	15,158	7,165	5,953
Warrants
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net (loss) income allocable to common stockholders per share calculation	0	0	1,883
Convertible Notes
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net (loss) income allocable to common stockholders per share calculation	21,543	0	0

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Common Stock and Warrants - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Aug. 06, 2020	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Common stock, shares outstanding		129,530,228	127,604,000
Change in fair value of warrant liability		$ 0	$ (1,801)	$ 49,354
Warrants
Class Of Stock [Line Items]
Number of common stock warrants exercised			1,882,600
Proceeds from warrants exercised		8,500
Warrants | Other Income (Expense)
Class Of Stock [Line Items]
Change in fair value of warrant liability			$ 1,800
2017 ATM Agreement
Class Of Stock [Line Items]
Remaining proceeds from common stock, under sales agreement		$ 120,000
Maximum
Class Of Stock [Line Items]
Common stock sales agreement aggregate sales proceeds	$ 120,000
Maximum | 2017 ATM Agreement
Class Of Stock [Line Items]
Commission on gross sales proceeds of common stock	3.00%

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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	May 28, 2014	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 31, 2022	Jun. 30, 2021	May 31, 2021	Jan. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in aggregate number of shares of common stock authorized for issuance					15,000,000		1,000,000
Stock-based compensation expense		$ 0	$ 2,774	$ 3,075
Expected dividend yield		0.00%
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense related to restricted stock		$ 20,400	13,200	7,900
Aggregate intrinsic value		62,200	37,000	37,300
Fair value of restricted stock units		$ 16,100	$ 15,700	4,700
Restricted stock unit awards outstanding		4,445,000	3,479,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vesting period		7 years
Stock-based compensation expense		$ 18,700	$ 17,200	11,100
Intrinsic value of options exercised		5,000	7,700	7,900
Fair value of stock options vested		19,500	17,500	9,000
Market Based Performance Stock Unit
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense related to restricted stock		2,500	800	1,800
Aggregate intrinsic value		$ 7,800	$ 2,100	$ 3,300
Restricted stock unit awards outstanding		557,000	193,000
Minimum | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period		7 years
Maximum | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period		10 years
2018 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Newly reserved shares of common stock		9,388,428				3,250,000		1,500,000
Time Based Vesting Schedule
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested equity awards		$ 46,100
Unrecognized compensation cost, weighted-average vesting period		1 year 7 months 6 days
Time Based Vesting Schedule | Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested equity awards		$ 5,500
Performance Based Vesting Schedule | Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock unit awards outstanding		36,000
2014 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested equity awards		$ 1,000
Unrecognized compensation cost, weighted-average vesting period		1 year 2 months 12 days
Shares issued to employees		161,000
Shares remaining available for future purchases		722,000
2014 Employee Stock Purchase Plan | The commencement of the offer period (generally, the sixteenth day in February or August)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price per share as percentage of fair market value of common stock	85.00%
2014 Employee Stock Purchase Plan | The exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price per share as percentage of fair market value of common stock	85.00%
2014 Employee Stock Purchase Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remaining available for future purchases					32,600,000		1,850,000

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Equity Plans and Stock-Based Compensation - Option Activity under Stock-Based Compensation Plans (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Shares Underlying Outstanding Options
Beginning balance	9,339
Options granted	1,982
Options exercised	(850)
Options cancelled:
Options forfeited (unvested)	(90)
Options expired (vested)	(261)
Ending balance	10,120	9,339
Vested and expected to vest at December 31, 2023	9,976
Exercisable at December 31, 2023	7,014
Weighted-Average Exercise Price Per Share
Beginning balance	$ 10.7
Options granted	11.17
Options exercised	7.48
Options cancelled:
Options forfeited (unvested)	10.93
Options expired (vested)	21.39
Ending balance	10.78	$ 10.7
Vested and expected to vest at December 31, 2023	10.77
Exercisable at December 31, 2023	$ 10.4
Weighted-Average Remaining Contractual Term (years)
Balance at December 31	4 years 2 months 4 days	4 years 7 months 9 days
Vested and expected to vest at December 31, 2023	4 years 1 month 24 days
Exercisable at December 31, 2023	3 years 6 months
Aggregate Intrinsic Value
Balance at December 31, 2022	$ 16,291
Balance at December 31, 2023	37,388	$ 16,291
Vested and expected to vest at December 31, 2023	37,024
Exercisable at December 31, 2023	$ 29,613

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Equity Plans and Stock-Based Compensation - Summary of Non-vested Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) shares in Thousands	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Number of Shares
Non-vested, Beginning Balance | shares	3,479
Granted | shares	2,748
Vested | shares	(1,515)	[1]
Forfeited | shares	(267)
Non-vested, Ending Balance | shares	4,445
Weighted-Average Grant-Date Fair Value Per Share
Non-vested, Beginning Balance | $ / shares	$ 11
Granted | $ / shares	11.48
Vested | $ / shares	10.13	[1]
Forfeited | $ / shares	11.45
Non-vested, Ending Balance | $ / shares	$ 11.57

[1] Inclusive of approximately 600,145 RSUs for the year ended December 31, 2023, which were not converted into shares due to net share settlement in order to cover the required amount of employee withholding taxes. The value of the withheld shares was classified as a reduction to additional paid-in capital.

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Equity Plans and Stock-Based Compensation - Summary Of Performance Based Restricted Stock Unit (Details) - Market Based Performance Stock Unit shares in Thousands	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested, Beginning Balance | shares	193
Granted | shares	364
Non-vested, Ending Balance | shares	557
Non-vested, Beginning Balance | $ / shares	$ 11.62
Granted | $ / shares	18.25
Non-vested, Ending Balance | $ / shares	$ 15.95

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Equity Plans and Stock-Based Compensation - Fair Value-Based Measurements and Weighted-Average Assumptions (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value	$ 7.32	$ 7.95	$ 7.17
Risk-free interest rate	4.00%	2.00%	0.70%
Expected life (in years)	4 years 6 months	4 years 6 months	4 years 6 months
Expected Volatility	0.80%	0.80%	0.90%
Market Based Performance Stock Unit
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value	$ 18.25	$ 11.62	$ 8.4
Risk-free interest rate	4.30%	1.70%
Expected life (in years)	2 years 10 months 24 days	2 years 10 months 24 days	2 years 10 months 24 days
Expected Volatility	0.90%	0.90%	0.90%
Market Based Performance Stock Unit | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate			0.03%
Market Based Performance Stock Unit | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate			1.92%
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value	$ 5.35	$ 7.37	$ 6.48
Risk-free interest rate	4.90%	2.10%	0.10%
Expected life (in years)	1 year 3 months 18 days	1 year 3 months 18 days	1 year 2 months 12 days
Expected Volatility	0.70%	1.00%	1.00%

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Equity Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Employees and directors stock-based compensation expense	$ 42,592	$ 32,915	$ 21,285
Stock-based compensation expense	0	2,774	3,075
Research and Development
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	9,285	5,954	3,818
Selling, General and Administrative
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	29,069	23,118	14,894
Cost of Sales - Product
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	1,839	1,123	553
Inventory
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	$ 2,399	$ 2,720	$ 2,020

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Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Contributions to 401 (k) plan	$ 1.3	$ 0.9	$ 0.3

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Income Taxes - Schedule of Component of Consolidated (Loss) Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S.	$ (6,275)	$ 292,460	$ 75,954
Non U.S.	1,908	1,839	1,567
Total	$ (4,367)	$ 294,299	$ 77,521

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Provision for income taxes	$ 2,022	$ 1,143	$ 808
Increase (decrease) in valuation allowance	1,500	300
Net operating loss carryforwards	353,500
Unrecognized tax benefits	12,101	11,339	$ 5,615
Unrecognized tax benefits would affect the effective tax rate	0
Interest related to unrecognized tax benefits	0	0
Penalties related to unrecognized tax benefits	0	$ 0
Federal
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 23,100
Federal | Minimum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year	2024
Federal | Research And Development Tax Credits
Income Tax Disclosure [Line Items]
Tax credit carryforward amount	$ 28,300
Federal | Research And Development Tax Credits | Minimum
Income Tax Disclosure [Line Items]
Tax credit carryforward amount, expiration year	2024
Federal | Research And Development Tax Credits | Maximum
Income Tax Disclosure [Line Items]
Tax credit carryforward amount, expiration year	2043
California and Other States
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 283,900
California and Other States | Minimum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year	2024
California and Other States | Maximum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year	2040
California State | Research And Development Tax Credits
Income Tax Disclosure [Line Items]
Tax credit carryforward amount	$ 22,300
Foreign
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 0

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Income Taxes - Schedule of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
Federal	$ (178)	$ (165)	$ 345
State	1,533	897	260
Non-US	667	411	203
Total current tax expense	2,022	1,143	808
Deferred
Federal	0	0	0
State	0	0	0
Non-US	0	0	0
Total deferred tax expense	0	0	0
Total income tax expense	$ 2,022	$ 1,143	$ 808

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Income taxes - Schedule of Difference between Consolidated Income Tax Benefit and Amount Computed by Federal Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income tax provision (benefit) at federal statutory rate	$ (917)	$ 61,775	$ 16,397
State tax	574	(2,942)	3,576
Business credits	(2,050)	(3,246)	(982)
Uncertain tax positions	334	586	424
Deferred compensation charges	830	(473)	131
Change in valuation allowance	1,466	(324)	(86,847)
Section 162(m) limitation	1,963	1,779	1,241
Mark-to-market of warrants	0	(378)	10,364
Net operating loss and tax credit limitation	0	(56,908)	56,459
Other	(518)	879	(290)
Foreign taxes	340	395	335
Total income tax expense	$ 2,022	$ 1,143	$ 808

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Income taxes - Schedule of Component of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Net operating loss carryforwards	$ 96,336	$ 113,228
Research credit carryforwards	34,940	33,444
Section 174 capitalization	22,556	15,308
Lease liability	8,868	9,530
Stock compensation	10,572	7,780
Accruals and reserves	15,808	9,089
Other	348	337
Total deferred tax assets	189,428	188,716
Less valuation allowance	(180,387)	(178,920)
Net deferred tax assets	9,041	9,796
Deferred tax liabilities:
Fixed assets	(2,667)	(2,916)
Operating lease right-of-use assets	(6,345)	(6,785)
Other	(29)	(95)
Total deferred tax liabilities	(9,041)	(9,796)
Net deferred tax assets	$ 0	$ 0

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Income taxes - Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Balance at Beginning Balance	$ (11,339)	$ (5,615)
Tax positions related to the current year, Additions	(762)	(670)
Tax positions related to the current year, Reductions	0	0
Tax positions related to the prior year, Additions	0	(5,054)
Tax positions related to the prior year, Reductions	0	0
Tax positions related to the prior year, Settlements	0	0
Tax positions related to the prior year, Lapses in statute		0
Balance at Ending Balance	$ (12,101)	$ (11,339)