Sagimet Biosciences Inc.

03/11/2026 | Press release | Distributed by Public on 03/11/2026 05:31

Annual Report for Fiscal Year Ending December 31, 2025 (Form 10-K)

Management's Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of operations should be read together with the financial statements and related notes included elsewhere in this Annual Report on Form 10-K. This discussion and analysis contains forward-looking statements that involve risks and uncertainties that could cause actual results or events to differ materially from those expressed or implied by such forward-looking statements as a result of many important factors, including those set forth in Part I of this Annual Report on Form 10-K under the caption "Risk Factors." Please also see the section titled "Forward-Looking Statements". We do not undertake any obligation to update forward-looking statements to reflect events or circumstances occurring after the date of this Annual Report.

Overview

We are a clinical-stage biopharmaceutical company developing novel therapeutics called fatty acid synthase (FASN) inhibitors that target dysfunctional metabolic and fibrotic pathways in diseases resulting from the overproduction of the fatty acid, palmitate. Our lead drug candidate, denifanstat, is an oral, once-daily pill and selective FASN inhibitor in development for the treatment of metabolic dysfunction-associated steatohepatitis (MASH), acne and select forms of cancer. Our second FASN inhibitor, TVB-3567, is a potent and selective small molecule FASN inhibitor in development for acne.

FASN inhibition for the treatment of MASH

The critical role of FASN overactivity in MASH makes it an attractive target for drug therapy. Our FASN inhibitor, denifanstat, targets multiple drivers of MASH by reducing steatosis, inflammation and fibrosis.

Phase 2b FASCINATE-2 clinical trial of denifanstat in MASH

Denifanstat met all primary and multiple secondary endpoints in the Phase 2b FASCINATE-2 clinical trial evaluating denifanstat in 168 biopsy-confirmed MASH patients with stage F2 or F3 fibrosis compared to placebo at week 52. We announced topline results in January 2024 and published the trial results in The Lancet Gastroenterology & Hepatology in October 2024. Denifanstat also demonstrated anti-fibrotic activity, including in patients with advanced fibrosis, as seen in the F3 modified intention to treat (mITT) population and qF4 patients (qF4 patients are AI-defined F4, based on the second harmonic generation (SGH) HistoIndex platform, which may encompass late stage F3 as well as F4 patients):

Fibrosis improvement by ≥ 1 stage with no worsening of MASH (F3 mITT population: denifanstat 49% vs. placebo 13%, p=0.0032).
Fibrosis improvement by ≥ 2 stages with no worsening of MASH (mITT population: denifanstat 20% vs. placebo 2%, p=0.0065; F3 mITT population: denifanstat 34% vs. placebo 4%, p=0.0065).
A statistically significant difference in progression to cirrhosis (F4) (mITT population: denifanstat 5% vs. placebo 11%, p=0.0386).
A statistically significant difference in fibrosis improvement by ≥ 1 stage with no worsening of MASH for patients on a stable background dose of a GLP-1 Receptor Agonist (mITT population: denifanstat 42% vs. placebo 0%, p=0.034).
Decrease of 1 or 2 qFibrosis stages in 85% of qF4 patients as measured by AI-based pathology (SGH, HistoIndex).
Statistically significant liver fibrosis regression in the portal and peri-portal regions (observed with AI-based digital pathology), which have been recently linked to major adverse liver outcomes (MALO) and mortality as measured by AI-based composite scores.

As in prior studies, denifanstat was generally well tolerated. No treatment-related serious adverse events (SAEs) were observed, and the majority of adverse events (AEs) were mild to moderate in nature (Grades 1 and 2). There were no Grade ≥3 treatment-related AEs and no drug-induced liver injury (DILI) signal in the study. The most common treatment-related AEs by system organ class (observed in ≥5% of patients in the study) were eye disorders, gastrointestinal disorders, and skin and subcutaneous tissue disorders. The incidence of treatment emergent adverse events (TEAEs) leading to treatment discontinuation was 19.6% in the denifanstat group compared to 5.4% in placebo.

Combination of denifanstat and resmetirom for the treatment of MASH

The Company is developing a combination of its oral once-daily FASN inhibitor, denifanstat, and the thyroid hormone receptor beta (THR-β) agonist, resmetirom (commercially available as Rezdiffra), for cirrhotic patients living with F4-stage MASH.

Phase 1 pharmacokinetic (PK) clinical trial of a combination of denifanstat and resmetirom

In December 2025, we announced completion of our Phase 1 PK trial of a combination of denifanstat and resmetirom. The Phase 1 PK was an open-label, 2-cohort study that enrolled 40 healthy adult participants. The trial objectives were to evaluate multiple-dose and

single-dose pharmacokinetics, identify any potential drug-drug interactions (DDI), and assess the safety and tolerability of the combination. The combination of denifanstat and resmetirom was generally well-tolerated over the duration of the study, with no safety signals. No SAEs occurred, and there were no clinically significant laboratory AEs, and no treatment-related discontinuations.

Our combination program builds upon preclinical data we presented at the European Association for the Study of the Liver(EASL) Congress in 2024 for two mouse models of MASH, showing that the combination of a FASN inhibitor (TVB-3664, a surrogate for denifanstat) and resmetirom, had a synergistic effect on important liver disease markers, including improvement of NAS by histologic analysis and more robust improvement in hepatic collagen content compared to the single agents. Synergistic activity of the combination was demonstrated in the rate of histological improvement (NAS ≥2 points), which was 33% for FASN inhibitor monotherapy, 25% for resmetirom monotherapy, and 80% for the combination of the two, a level of improvement that greatly exceeds a simple addition of the activity of the two drugs.

We plan to use these data to advance the development of the combination into a Phase 2 proof-of-concept efficacy trial for patients living with MASH with F4 fibrosis, expected to initiate in the second half of 2026, subject to consultation with regulatory authorities.

Acne

In additionto MASH, we are evaluating our FASN inhibitorsin acne, a disorder in which dysregulation of fatty acid metabolism also plays a key role.Denifanstat is being developed for acne in China by our license partner for China, Ascletis BioScience Co. Ltd. (Ascletis), a subsidiary of Ascletis Pharma Inc. (Ascletis Pharma). Our potent and selective small molecule FASN inhibitor, TVB-3567, is currently in a first-in-human Phase 1 clinical trial for development of an acne indication. Acne is a promising therapeutic area for application of FASN inhibitors because FASN is required for sebum production, which is upregulated in acne and leads to exacerbation of acne lesions including development of nodules and cysts.

Phase 3 clinical trial of denifanstat in acne

In January 2026, Ascletis reported positive topline results in the open-label Phase 3 trial evaluating the long-term safety of ASC40 (denifanstat) tablets in patients with moderate to severe acne in China.

In December 2025, Ascletis announced that the China National Medical Products Administration (NMPA) accepted its New Drug Application (NDA) for denifanstat for the treatment of moderate to severe acne.

In June 2025, Ascletis announced that denifanstat met all primary and secondary endpoints in its Phase 3 trial in moderate to severe acne vulgaris in China. The Phase 3 clinical trial was a randomized, double-blind, placebo-controlled, multicenter clinical trial of 480 enrolled patients randomized 1:1 to receive denifanstat 50mg or placebo, once daily for 12 weeks.

Ascletis reported the following efficacy data from the Phase 3 trial:

All primary endpoints were met, including:

the percentage of treatment success (defined as an Investigator's Global Assessment (IGA) score of 0 (clear) or 1 (almost clear) with at least a 2-point decrease from baseline) (denifanstat 33.2% vs. placebo 14.6%, p<0.0001).

the percentage change in total lesion count (denifanstat -57.4% vs. placebo -35.4%, p<0.0001).

the percentage change in inflammatory lesion count (denifanstat -63.5% vs. placebo -43.2%, p<0.0001).

The secondary endpoint of change in non-inflammatory lesion count was also met (denifanstat -51.9% vs. placebo -28.9%, p<0.0001).

Ascletis reported that denifanstat was generally well-tolerated. Following 12 weeks of once-daily oral administration at 50 mg, the incidence rates of TEAEs were comparable between denifanstat and placebo.

Phase 1 clinical trial of TVB-3567

In June 2025, we initiated a first-in-human Phase 1 clinical trial of our potent and selective small molecule FASN inhibitor, TVB-3567, for development of an acne indication. The Phase 1 clinical trialis a randomized double-blind placebo-controlled trial designed to evaluate the safety, tolerability, pharmacokinetics and pharmacodynamics of TVB-3567 in healthy participants with or without acne. The trial is comprised of several parts, including single ascending dose cohorts and multiple ascending dose cohorts in participants without acne, followed by testing in participants with acne including evaluation of pharmacodynamic biomarkers.

Subject to consultation with regulatory authorities, and contingent on the results of the Phase 1 trial, we anticipate initiating the Phase 2 trial of TVB-3567 in 2026.

Components of results of operations

Research and development expenses

Research and development expenses represent costs incurred in performing research, development and manufacturing activities in support of our own product development efforts and include internal personnel-related costs (such as salaries, employee benefits and stock-based compensation) for our personnel in research and development functions; as well as external costs, including costs related to acquiring, developing and manufacturing supplies for preclinical studies, clinical trials and other studies, including fees paid to contract manufacturing organizations (CMOs); costs and expenses related to agreements with contract research organizations (CROs), investigative sites and consultants to conduct non-clinical and preclinical studies and clinical trials; and professional and consulting services costs. Research and development expenses also include the costs of acquired product licenses and related technology rights where there is no alternative future use.

All research and development expenses are charged to operations as incurred in accordance with Accounting Standards Codification 730, Research and Development. We account for non-refundable advance payments for goods and services that will be used in future research and development activities as expenses when the service has been performed or when the goods have been received, rather than when the payment is made.

We expect our research and development expenses to increase substantially for the foreseeable future as we advance our drug candidates into and through preclinical studies and clinical trials, pursue regulatory approval and expand our pipeline.

General and administrative expenses

Our general and administrative expenses consist primarily of costs and expenses related to: personnel (including salaries, employee benefits and stock-based compensation) in our executive, finance and accounting and other administrative functions; legal services, including relating to intellectual property and corporate matters; accounting, auditing, consulting and tax services; insurance; information technology; and facility and other allocated costs not otherwise included in research and development expenses.

We expect our general and administrative expenses to increase for the foreseeable future as we increase our headcount and continue to grow our corporate infrastructure.

Other income

Other income consists primarily of interest income earned on our cash, cash equivalents and marketable securities offset by accretion of discounts to maturity on our marketable securities.

Results of operations

Comparison of the years ended December 31, 2025 and 2024

The following table summarizes our results of operations for the periods indicated (in thousands):

Years Ended December 31,

​ ​ ​

2025

​ ​ ​

2024

​ ​ ​

$ Change

​ ​ ​

% Change

Operating expenses:

Research and development

$

39,054

$

38,444

$

610

2

%

General and administrative

17,835

16,010

1,825

11

%

Total operating expenses

56,889

54,454

2,435

4

%

Loss from operations

(56,889)

(54,454)

(2,435)

4

%

Total other income

5,851

8,887

(3,036)

(34)

%

Net loss

$

(51,038)

$

(45,567)

$

(5,471)

12

%

Research and development - Research and development expenses for the years ended December 31, 2025 and 2024 were comprised of the following (in thousands):

Years Ended December 31,

​ ​ ​

2025

​ ​ ​

2024

​ ​ ​

$ Change

​ ​ ​

% Change

External expenses

Clinical development and research

$

20,987

$

23,912

$

(2,925)

(12)

%

Manufacturing and non-clinical

11,405

8,488

2,917

34

%

External consulting and other

1,940

2,248

(308)

(14)

%

Subtotal - external expenses

$

34,332

$

34,648

$

(316)

(1)

%

Internal expenses

Personnel costs

$

3,591

$

2,814

$

777

28

%

Stock-based compensation

933

982

(49)

(5)

%

Other internal operating expenses

198

-

198

100

%

Subtotal - internal expenses

$

4,722

$

3,796

$

926

24

%

Total research and development expenses

$

39,054

$

38,444

$

610

2

%

Research and development expenses increased by $0.6 million, or 2%, for the year ended December 31, 2025, compared to the year ended December 31, 2024. This increase was primarily due to (i) a $2.9 million increase in manufacturing and non-clinical expenses relating primarily to the $2.5 million up-front license fee recognized in connection with a license agreement with Assia Chemical Industries Ltd., and (ii) a $0.8 million increase in personnel costs due to an increase in headcount. These increases were partially offset by a net decrease in clinical development and research expenses of $2.9 million driven by lower clinical trial costs in connection with start-up activities for a Phase 3 trial of denifanstat in MASH, lower clinical trial expenses for the Phase 2b FASCINATE-2 trial as the trial was substantially complete in the first quarter of 2024 with topline results for the trial announced in January 2024, as well as lower costs for other denifanstat studies. The decrease in clinical development and research expenses were partially offset by an increase in clinical trial costs incurred for our Phase 1 clinical trial of TVB-3567, which was initiated in June 2025, and the Phase 1 PK clinical trial for the combination of denifanstat and resmetirom, which was initiated in September 2025.

External research and development expenses for the years ended December 31, 2025 and 2024 were comprised of the following (in thousands):

Years Ended December 31,

​ ​ ​

2025

​ ​ ​

2024

​ ​ ​

$ Change

​ ​ ​

% Change

Denifanstat external research and development expenses

$

28,248

$

33,838

$

(5,590)

(17)

%

TVB-3567 external research and development expenses

6,084

810

5,274

651

%

Total external research and development expenses

$

34,332

$

34,648

$

(316)

(1)

%

General and administrative - General and administrative expenses increased by $1.8 million, or 11%, for the year ended December 31, 2025, compared to the year ended December 31, 2024 primarily due to (i) a $1.2 million increase in stock-based compensation expense driven by an increase in headcount and (ii) a $0.8 million increase in professional fees, driven by legal fees and the write-off of deferred financing costs related to the 2024 ATM Offering (defined below).

Other income - Other income decreased by $3.0 million, or 34%, for the year ended December 31, 2025, compared to the year ended December 31, 2024, primarily due to a decrease in interest income earned driven by a lower cash, cash equivalents and marketable securities balance as well as lower yields during the year ended December 31, 2025.

Liquidity and capital resources

Sources and uses of cash

Since our inception, we have devoted substantially all of our resources to researching, discovering and developing our pipeline of proprietary FASN inhibitors and other drug targets, organizing and staffing our company, performing business planning, establishing our intellectual property portfolio, raising capital and general and administration activities to support and expand such activities. We do not have any products approved for sale and have not generated any revenue from product sales. Our revenues to date have been generated solely from the license agreement with Ascletis.

To date, we have financed our operations primarily through public and private equity and debt financings, including our IPO of Series A common stock in July 2023 and our follow-on offering in January 2024, from which we received aggregate net proceeds of $190.9 million. Prior to becoming a public company, we raised $233.3 million in gross proceeds from the sale of our redeemable convertible preferred stock and convertible notes.

In August 2024, we entered into a Controlled Equity Offering Sales Agreement with Cantor Fitzgerald & Co. to establish an at-the-market offering (2024 ATM Offering) through which we could offer and sell, from time to time at our sole discretion, up to $75.0 million of shares of our Series A common stock. In connection with the establishment of the 2025 ATM Offering (as defined below), we terminated the 2024 ATM Offering. No shares of Series A common stock were sold under the 2024 ATM Offering prior to such termination.

In August 2025, we entered into a Sales Agreement with Leerink Partners LLC to establish an at-the-market offering (2025 ATM Offering) through which we may sell, from time to time at our sole discretion, up to $75.0 million shares of our Series A common stock. There were no sales under the 2025 ATM Offering during the year ended December 31, 2025.

As of December 31, 2025, we had cash, cash equivalents and marketable securities of $113.1 million. We do not expect to generate any revenue from commercial product sales unless and until we successfully complete development and obtain regulatory approval for one or more of our drug candidates, which we expect will take a number of years, if ever. We anticipate that we will continue to incur significant expenses for the foreseeable future as we continue to advance our drug candidates through preclinical and clinical trials; manufacture supplies for our preclinical studies and clinical trials; expand our corporate infrastructure, including the costs associated with being a public company; pursue regulatory approval of our drug candidates; hire additional personnel; acquire, discover, validate and develop additional drug candidates; and obtain maintain, expand and protect our intellectual property portfolio.

Until we can generate a sufficient amount of revenue from the commercialization of our drug candidates or additional revenue from collaboration agreements with third parties, if ever, we expect to finance our future cash needs through public or private equity or debt financings, third-party funding and marketing and distribution arrangements, as well as other collaborations, strategic alliances and licensing arrangements, or any combination of these approaches. The sale of equity or convertible debt securities may result in dilution to our stockholders and, in the case of preferred equity securities or convertible debt, those securities could provide for rights, preferences or privileges senior to those of our common stock. Debt financings may subject us to covenant limitations or restrictions on our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. Our ability to raise additional funds may be adversely impacted by macroeconomic conditions, disruptions to and volatility in the credit and financial markets and geopolitical turmoil. There can be no assurance that we will be successful in acquiring additional funding at levels sufficient to fund our operations or on terms favorable or acceptable to us. If we are unable to obtain adequate financing when needed or on terms favorable or acceptable to us, we may be forced to delay, reduce the scope of or eliminate one or more of our research and development programs.

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

difficulties obtaining regulatory approval to commence a clinical trial or complying with conditions imposed by a regulatory authority regarding the scope or term of a clinical trial;
conditions imposed on us by the FDA or other regulatory authorities regarding the scope or design of our clinical trials;
delays in reaching or failing to reach agreement on acceptable terms with prospective CROs, CMOs, and trial sites, the terms of which can be subject to extensive negotiation and may vary significantly;
insufficient supply of our drug candidates or other materials necessary to conduct and complete our clinical trials;
difficulties obtaining institutional review board (IRB) or ethics committee approval to conduct a clinical trial at a prospective site;
slow enrollment and retention rate of subjects in our clinical trials;
the FDA or other regulatory authority requiring alterations to any of our study designs, our preclinical strategy or our manufacturing plans;
governmental or regulatory delays and changes in regulatory requirements, policy and guidelines; serious and unexpected drug-related side effects related to the drug candidate being tested;
lack of adequate funding to continue clinical trials;
subjects experiencing severe or unexpected drug-related adverse effects;
occurrence of severe adverse effects in clinical trials of the same class of agents conducted by other companies;
any changes to our manufacturing process, suppliers or formulation that may be necessary or desired;
third-party vendors not performing manufacturing and distribution services in a timely manner or to sufficient quality standards;
third-party clinical investigators losing the licenses or permits necessary to perform our clinical trials, not performing our clinical trials on our anticipated schedule or consistent with the clinical trial protocol, good clinical practice (GCP), or other regulatory requirements;
third-party contractors not performing data collection or analysis in a timely or accurate manner;
third-party contractors becoming debarred or suspended or otherwise penalized by the FDA or other government or regulatory authorities for violations of regulatory requirements, in which case we may need to find a substitute contractor, and we may not be able to use some or all of the data produced by such contractors in support of our marketing applications; and
failure of our third-party contractors, such as CROs and CMOs, or our investigators to comply with regulatory requirements or otherwise meet their contractual obligations in a timely manner.

A change in the outcome of any of these or other variables could significantly change our costs and timing associated with the development of our drug candidates. Furthermore, our operating plans may change in the future, and we may need additional funds to meet operational needs and capital requirements associated with such change.

We rely and will continue to rely on third parties in the conduct of our preclinical studies and clinical trials and for manufacturing and supply of our drug candidates. We have no internal manufacturing capabilities, and we will continue to rely on third parties for our preclinical study and clinical trial materials. Given our stage of development, we do not yet have a marketing or sales organization or

commercial infrastructure. Accordingly, if we obtain regulatory approval for any of our drug candidates, we also expect to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution.

We enter into contracts in the normal course of business for products and services, including contract research and contract manufacturing services, which include provisions allowing for termination under certain conditions and timelines. These contracts generally do not include payments for early termination and are considered cancellable contracts.

Based on our current business plan, we believe that our existing cash, cash equivalents and marketable securities as of December 31, 2025, will be sufficient for us to fund our operating expenses for at least the next 12 months from the issuance of our audited financial statements.

Cash flows

The following table shows a summary of our cash flows for each of the periods presented below (in thousands):

Years Ended December 31,

​ ​ ​

2025

​ ​ ​

2024

Net cash (used in) provided by:

Operating activities

$

(45,650)

$

(42,435)

Investing activities

4,556

(61,683)

Financing activities

275

104,819

Net (decrease) increase in cash and cash equivalents

$

(40,819)

$

701

Cash flows from operating activities - Net cash used in operating activities was $45.7 million for the year ended December 31, 2025, and primarily related to cash used to fund clinical development, manufacturing and other non-clinical activities for denifanstat, inclusive of start-up costs for a Phase 3 trial of denifanstat in MASH as well as the Phase 1 PK clinical trial for the combination of denifanstat and resmetirom, clinical development and manufacturing costs for TVB-3567, as well as costs associated with operating as a public company.

Net cash used in operating activities was $42.4 million for the year ended December 31, 2024, and primarily related to cash used to fund clinical development, manufacturing and other non-clinical activities for denifanstat, inclusive of clinical-batch manufacturing and other trial start-up costs for a Phase 3 trial of denifanstat in MASH, as well as costs to build out our corporate infrastructure and costs associated with being a public company.

Cash flows from investing activities - Net cash provided by investing activities was $4.6 million for the year ended December 31, 2025 and related to proceeds received from the sale and maturity of marketable securities of $111.4 million, partially offset by purchases of marketable securities of $106.8 million.

Net cash used in investing activities was $61.7 million for the year ended December 31, 2024 and related to purchases of marketable securities of $108.1 million, partially offset by proceeds received from the sale and maturity of marketable securities of $46.4 million.

Cash flows from financing activities - Net cash provided by financing activities was approximately $0.3 million for the year ended December 31, 2025, relating to proceeds from stock option exercises during the period.

Net cash provided by financing activities was $104.8 million for the year ended December 31, 2024, which primarily related to net cash proceeds of $105.7 million received from the sale of Series A common stock in our January 2024 follow-on offering and $0.1 million in proceeds from stock option exercises during the period, offset by the payment of financing costs related to the January 2024 follow-on offering of $1.0 million.

Critical accounting policies and estimates

We prepare our financial statements in accordance with accounting principles generally accepted in the United States of America. The preparation of financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, costs and expenses and related disclosures. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. Actual results could differ significantly from the estimates made and changes in estimates may occur.

While our significant accounting policies are described in more detail in Note 2 in our financial statements appearing elsewhere in this Annual Report on Form 10-K, we believe that the following accounting policies are those most critical to the judgments and estimates used in the preparation of our financial statements.

Accrued research and development expenses

As part of the process of preparing our financial statements, we are required to estimate our accrued research and development expenses. This process involves reviewing open contracts and purchase orders, communicating with our applicable personnel to identify services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of actual costs. The majority of our service providers require advance payments; however, some invoice us in arrears for services performed, on a pre-determined schedule or when contractual milestones are met. We make estimates of our accrued expenses as of each balance sheet date in the financial statements based on facts and circumstances known to us at that time. We periodically confirm the accuracy of the estimates with the service providers and make adjustments if necessary.

We base our expenses related to manufacturing, preclinical studies, clinical trials and other studies on our estimates of the services performed pursuant to contracts with research institutions, CROs and CMOs that conduct and manage such activities on our behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the expense. Payments under some of these contracts depend on factors such as the successful enrollment of patients and the completion of clinical trial milestones. In accruing service fees when we have not yet been invoiced or otherwise notified of actual costs, we estimate the level of activity completed in each period. These estimates are based on the review of underlying contracts, discussions with key research and development personnel as to the progress of studies, and communications with the third-party service providers. We also monitor patient enrollment levels and related activities to the extent possible through discussions with CRO personnel to estimate clinical trial costs based on the best information available at each balance sheet date. If the actual timing of the performance of services or the level of effort varies from the estimate, we adjust the accrual or prepaid expense accordingly. Although we do not expect our estimates to be materially different from amounts actually incurred, our understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in reporting amounts that are too high or too low in any particular period. There have been no material changes in estimates for the periods presented within this Annual Report on Form 10-K.

Stock-based compensation expense

We recognize stock-based compensation expense in an amount equal to the estimated grant date fair value of each option grant or stock award over the estimated period of service and vesting. This estimation of the fair value of each stock-based grant or issuance on the date of grant involves numerous assumptions by management. Although we calculate the fair value using the Black Scholes option pricing model, which is a standard option pricing model, this model still requires the use of numerous estimates, including, among others, the expected term of the award, the volatility of the underlying equity security, a risk-free interest rate, fair value of common stock, and expected dividends. The use of different values in connection with these estimates in the Black Scholes option pricing model could produce substantially different results.

For awards with service-based vesting conditions only, we recognize stock-based compensation expense on a straight-line basis over the requisite service or vesting period. For awards with service- and performance- based vesting conditions, we recognize stock-based compensation expense using the graded vesting method over the requisite service period beginning in the period in which the awards are deemed probable to vest, to the extent such awards are probable to vest. We recognize the cumulative effect of changes in the probability outcomes in the period in which the changes occur.

The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option-pricing model. Due to the lack of trading history, our computation of expected stock volatility is based on the volatility rates of comparable publicly held companies over a period equal to the expected term of the option. We expect to continue to do so until such time we have adequate historical data regarding the volatility of our traded stock price. Our computation of expected term is determined using the simplified method, which represents the average of the contractual term of the options and the weighted-average expected vesting period. We believe that we do not have sufficient reliable exercise data in order to justify the use of a method other than the simplified method of estimating the expected exercise term of employee stock option grants. For non-employee stock option grants, we have the option to utilize either the expected term or the contractual term, determined on an award-by-award basis. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the

option. We utilize a dividend yield of zero based on the fact that we have never paid cash dividends to stockholders and have no current intentions to pay cash dividends. The fair value of the common stock is determined based on the quoted market price of our Series A common stock.

Stock-based compensation expense is included in both research and development expenses and general and administrative expenses in the statements of operations and comprehensive loss. There have been no material changes in estimates, or our estimation methods, for the periods presented within this Annual Report on Form 10-K.

Emerging growth company and smaller reporting status

We are an emerging growth company, as defined in the Jumpstart Our Business Startups Act (the JOBS Act). Under the JOBS Act, emerging growth companies can delay the adoption of new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. Other exemptions and reduced reporting requirements under the JOBS Act for emerging growth companies include an exemption from the requirement to provide an auditor's report on internal controls over financial reporting pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, as amended, an exemption from any requirement that may be adopted by the Public Company Accounting Oversight Board regarding mandatory audit firm rotation and less extensive disclosure about our executive compensation arrangements. We have elected to use the extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that (i) we are no longer an emerging growth company or (ii) we affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, our financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

We will remain an emerging growth company until the earliest of (i) the last day of our first fiscal year in which we have total annual gross revenues of $1.235 billion or more, (ii) December 31, 2028, (iii) the date on which we are deemed to be a large accelerated filer, under the rules of the SEC, which means the market value of equity securities that is held by non-affiliates exceeds $700.0 million as of the prior June 30th and (iv) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the prior three-year period.

We are also a "smaller reporting company," meaning that the market value of our stock held by non-affiliates is less than $700 million and our annual revenue was less than $100 million during the most recently completed fiscal year. We may continue to be a smaller reporting company if either (i) the market value of our stock held by non-affiliates is less than $250 million or (ii) our annual revenue is less than $100 million during the most recently completed fiscal year and the market value of our stock held by non-affiliates is less than $700 million. If we are a smaller reporting company at the time we cease to be an emerging growth company, we may continue to rely on exemptions from certain disclosure requirements that are available to smaller reporting companies. Specifically, as a smaller reporting company we may choose to present only the two most recent fiscal years of audited financial statements in our Annual Report on Form 10-K and, similar to emerging growth companies, smaller reporting companies have reduced disclosure obligations regarding executive compensation.

Recently adopted accounting pronouncements

See "Notes to the Financial Statements-Note 2" included in our financial statements in Item 8 in this Annual Report for more information.

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