ANAPTYSBIO, INC (ANAB)

CIK: 0001370053. SIC: 2834 Pharmaceutical Preparations. Latest 10-K as of: 2026-03-03.

SIC breadcrumb: Manufacturing > Chemicals And Allied Products > SIC 2834 Pharmaceutical Preparations

SEC company page: https://www.sec.gov/edgar/browse/?CIK=1370053. Latest filing source: 0001193125-26-088290.

Selected Fundamentals

Financials

Annual standardized facts from SEC companyfacts as of latest extracted filing date 2026-04-28. Source: https://data.sec.gov/api/xbrl/companyfacts/CIK0001370053.json. Derived margins, ratios, and free cash flow are computed from the extracted annual SEC facts.

Flow metrics use full-year FY periods from 10-K/10-K/A filings; balance-sheet metrics use FY-end instants. Free cash flow = operating cash flow - capital expenditures. Missing metrics are omitted rather than fabricated.

Ratios

ROE and ROA use period-end equity/assets. Liabilities / equity uses total liabilities divided by stockholders' equity. Current ratio uses current assets divided by current liabilities when both are reported.

Financial Charts

Quarterly

Quarterly standardized facts from SEC companyfacts as of latest extracted filing date 2026-05-12. Source: https://data.sec.gov/api/xbrl/companyfacts/CIK0001370053.json.

Flow metrics use discrete quarter-length periods from 10-Q/10-Q/A filings. Q4 revenue and net income are derived only when annual FY and nine-month YTD facts exist for the same fiscal year; derived Q4 values are labeled. EPS Q4 is not derived.

Quarterly Charts

Macro Cross-References

• CPIAUCSL - Consumer Price Index for All Urban Consumers: All Items in U.S. City Average
• UNRATE - Unemployment Rate
• FEDFUNDS - Federal Funds Effective Rate
• CES0500000003 - Average Hourly Earnings of All Employees, Total Private
• DFEDTARU - Federal Funds Target Range - Upper Limit
• DFEDTARL - Federal Funds Target Range - Lower Limit
• DGS3MO - Market Yield on U.S. Treasury Securities at 3-Month Constant Maturity
• DGS2 - Market Yield on U.S. Treasury Securities at 2-Year Constant Maturity
• DGS10 - Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity
• DGS30 - Market Yield on U.S. Treasury Securities at 30-Year Constant Maturity
• T10Y2Y - 10-Year Treasury Constant Maturity Minus 2-Year Treasury Constant Maturity
• CPILFESL - Consumer Price Index for All Urban Consumers: All Items Less Food and Energy
• CPIUFDSL - Consumer Price Index for All Urban Consumers: Food
• CPIENGSL - Consumer Price Index for All Urban Consumers: Energy
• CUSR0000SAH1 - Consumer Price Index for All Urban Consumers: Shelter
• PCEPI - Personal Consumption Expenditures: Chain-type Price Index
• PCEPILFE - Personal Consumption Expenditures Excluding Food and Energy: Chain-type Price Index
• PPIACO - Producer Price Index by Commodity: All Commodities
• T10YIE - 10-Year Breakeven Inflation Rate
• U6RATE - Total Unemployed, Plus All Marginally Attached Workers Plus Total Employed Part Time for Economic Reasons
• PAYEMS - All Employees, Total Nonfarm
• CIVPART - Labor Force Participation Rate
• EMRATIO - Employment-Population Ratio
• UNEMPLOY - Unemployed
• CE16OV - Employment Level
• ICSA - Initial Claims
• JTSJOL - Job Openings: Total Nonfarm
• JTSQUR - Quits: Total Nonfarm
• GDPC1 - Real Gross Domestic Product
• A191RL1Q225SBEA - Real Gross Domestic Product: Percent Change from Preceding Period
• INDPRO - Industrial Production: Total Index
• TCU - Capacity Utilization: Total Index
• HOUST - New Privately-Owned Housing Units Started: Total Units
• PERMIT - New Privately-Owned Housing Units Authorized in Permit-Issuing Places: Total Units
• RSAFS - Advance Retail Sales: Retail Trade
• PCE - Personal Consumption Expenditures
• DSPIC96 - Real Disposable Personal Income
• PSAVERT - Personal Saving Rate
• M2SL - M2
• BOPGSTB - U.S. International Trade in Goods and Services: Balance
• MSPUS - Median Sales Price of Houses Sold for the United States
• HSN1F - New One Family Houses Sold: United States
• RHORUSQ156N - Homeownership Rate in the United States
• TTLCONS - Total Construction Spending: Total Construction in the United States
• RRVRUSQ156N - Rental Vacancy Rate in the United States
• TOTALSL - Total Consumer Credit Owned and Securitized
• REVOLSL - Revolving Consumer Credit Owned and Securitized
• DRCCLACBS - Delinquency Rate on Credit Card Loans, All Commercial Banks
• GDP - Gross Domestic Product
• GPDI - Gross Private Domestic Investment
• GCE - Government Consumption Expenditures and Gross Investment
• PCEC - Personal Consumption Expenditures
• NETEXP - Net Exports of Goods and Services
• GFDEBTN - Federal Debt: Total Public Debt
• GFDEGDQ188S - Federal Debt: Total Public Debt as Percent of Gross Domestic Product
• FYFSD - Federal Surplus or Deficit
• FGRECPT - Federal Government Current Receipts
• FGEXPND - Federal Government: Current Expenditures
• MANEMP - All Employees, Manufacturing
• USCONS - All Employees, Construction
• USTRADE - All Employees, Retail Trade
• USFIRE - All Employees, Financial Activities
• USGOVT - All Employees, Government
• AWHAETP - Average Weekly Hours of All Employees, Total Private
• DGORDER - Manufacturers' New Orders: Durable Goods
• NEWORDER - Manufacturers' New Orders: Nondefense Capital Goods Excluding Aircraft
• BUSINV - Total Business Inventories
• EXPGS - Exports of Goods and Services
• IMPGS - Imports of Goods and Services
• IR - Import Price Index (End Use): All Commodities
• PPIFIS - Producer Price Index by Commodity: Final Demand

Latest quarter (10-Q)

Latest 10-Q source: 0001193125-26-219515.

Extracted structurally from real Item 2 body heading to real Item 3/4 boundary. Published MD&A gate trimmed front/tail over-capture. Confidence: high. Filing date: 2026-05-12. Report date: 2026-03-31.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

You should read the following discussion and analysis of our financial condition and results of operations together with our unaudited consolidated financial statements and related notes for the three months ended March 31, 2026, included in Part I, Item 1 of this report and with our audited consolidated financial statements and related notes thereto for the year ended December 31, 2025 included in our Annual Report on Form 10-K. This discussion and other sections of this Quarterly Report contain forward-looking statements that involve risks and uncertainties, such as our plans, objectives, expectations, intentions, and beliefs. Our actual results could differ materially from those discussed in these forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those identified below and those discussed in the section entitled “Risk Factors” included in Part II, Item 1A of this Quarterly Report. You should also carefully read “Special Note Regarding Forward-Looking Statements”.

Overview

Prior to the separation described below, we were a clinical-stage biotechnology company focused on delivering innovative immunology therapeutics for autoimmune and inflammatory diseases. Our clinical-stage pipeline included rosnilimab, a selective pathogenic T cell depleter, for which we completed a Phase 2b trial for the treatment of moderate-to-severe rheumatoid arthritis (“RA”), ANB033, a CD122 antagonist, in a Phase 1b trial for celiac disease (“CeD”) and eosinophilic esophagitis (“EoE”), and ANB101, a BDCA2 modulator, in a Phase 1a trial. We also discovered and out-licensed, in financial collaborations, multiple therapeutic antibodies, including a PD-1 antagonist (Jemperli (dostarlimab-gxly) or “Jemperli”) to GSK and an IL-36R antagonist (imsidolimab) to Vanda Pharmaceuticals Inc. (“Vanda”). We recognize revenue from milestones and royalties achieved under our immuno-oncology collaboration with GSK and license and transition services revenue from our collaboration with Vanda.

First Tracks Biotherapeutics Separation

In September 2025, we announced that our board of directors (“Board of Directors”) approved plans to explore separating our business into two independent, publicly traded companies. We would hold and continue to manage the financial collaboration for Jemperli with GSK and for imsidolimab with Vanda, with a focus on protecting and returning value of the royalties to its stockholders. The spun-out company would be a clinical-stage biotechnology company focused on the development and potential commercialization of innovative therapeutics for autoimmune and inflammatory diseases, including rosnilimab, ANB033 and ANB101. This separation was completed on April 20, 2026.

In connection with the separation, we entered into a separation and distribution agreement (the “Separation and Distribution Agreement”) with First Tracks Biotherapeutics, Inc. (“First Tracks Biotherapeutics”). The Separation and Distribution Agreement identifies the assets transferred to (including contracts assigned) or retained by, and the liabilities assumed or retained by, each of us and First Tracks Biotherapeutics. As the separation occurred after March 31, 2026, the results of First Tracks Biotherapeutics are included in our consolidated financial statements.

Collaborative Programs

GSK Collaboration

Multiple company-discovered antibody programs have been advanced to preclinical and clinical milestones under our collaborations. Our collaborations include an immuno-oncology-focused collaboration with GSK.

Under the GSK Agreement, a Biologics License Application (“BLA”) for Jemperli (dostarlimab), a PD-1 antagonist antibody, was approved by the FDA in April 2021 for the treatment of advanced or recurrent deficient mismatch repair endometrial cancer (“dMMREC”). In February 2023, the FDA granted full approval for this indication. In addition, in April 2021, the European Medicines Agency (“EMA”) granted conditional marketing authorization in the European Union (“EU”) for Jemperli for use in women with mismatch repair deficient (“dMMR”)/microsatellite instability-high (“MSI-H”) recurrent or advanced endometrial cancer who have progressed on or following prior treatment with a platinum containing regimen. A second FDA approval was received in August 2021 for Jemperli in pan-deficient mismatch repair tumors (PdMMRT). In July 2023, the FDA approved Jemperli in combination with chemotherapy for the treatment of adult patients with dMMR MSI-H primary advanced or recurrent endometrial cancer. In December 2023, the EMA approved Jemperli plus chemotherapy for dMMR/MSI-H primary advanced or recurrent

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endometrial cancer. In August 2024, the FDA approved Jemperli plus chemotherapy for all adult patients with primary advanced or recurrent endometrial cancer. In January 2025, the EMA approved Jemperli plus chemotherapy for this same indication.

Vanda Collaboration

On January 31, 2025, we entered into an Exclusive License Agreement (the “Vanda License Agreement”) with Vanda pursuant to which we granted to Vanda an exclusive, global license for the development and commercialization of imsidolimab (IL-36R antagonist mAb), which has completed two registration-enabling global Phase 3 trials, GEMINI-1 and GEMINI-2, evaluating the safety and efficacy of imsidolimab in patients with generalized pustular psoriasis (“GPP”).

In December 2025, Vanda announced the submission of a BLA to the FDA for imsidolimab in GPP. The FDA accepted the BLA filing for imsidolimab in GPP in February 2026 with a target action date of December 12, 2026.

Pursuant to the terms of the Vanda License Agreement, we received an upfront payment of $10.0 million and a $5.0 million payment for existing drug supply. We are also eligible to receive a 10% royalty on net sales under the Vanda License Agreement:

The Separation and Distribution Agreement provides that any and all rights to receive milestone payments under the Vanda License Agreement will be allocated to First Tracks Biotherapeutics. For more information about these collaborations, see Note 4 — Collaborative Research and Development Agreements in the accompanying notes to the consolidated financial statements.

Components of Operating Results

Collaboration Revenue

We have not generated any revenue from product sales. Our revenue has been derived from amortization of upfront license payments, research and development funding, milestone and royalty payments under collaboration and license agreements with our collaborators. From inception through March 31, 2026, we have recognized $606.7 million in revenue from our collaborators.

Research and Development Expense

Research and development expenses consist of costs associated with our research and development activities, preclinical and clinical development of our programs, and manufacturing. Our research and development expenses included:

•
External research and development expenses incurred under arrangements with third parties, such as contract research organizations (“CROs”), consultants, members of our scientific and therapeutic advisory boards, and contract manufacturing organizations (“CMOs”);

•
Employee-related expenses, including salaries, benefits, travel, and stock-based compensation;

•
Facilities, depreciation and other allocated expenses, which include direct and allocated expenses for rent and maintenance of facilities, depreciation of leasehold improvements and equipment, and laboratory supplies; and

•
License and sub-license fees.

We may also incur in-process research and development expense as we acquire assets from other parties. Acquired in-process research and development costs that have no alternative future use are immediately expensed.

We expense research and development costs as incurred. We account for nonrefundable advance payments for goods and services that will be used in future research and development activities as expense when the service has been performed or when the goods have been received.

We are conducting research and development activities primarily on inflammation programs. We have a research and development team that conducts antibody characterization, translational studies, IND-enabling preclinical studies, and clinical development. We conduct some of our preclinical activities internally and plan to rely on third parties, such as CROs and CMOs, for the execution of certain of our research and development activities, such as in vivo toxicology and pharmacology studies, drug product manufacturing, and clinical trials.

Following the separation, we do not expect to incur significant research and development expenses.

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General and Administrative Expense

General and administrative expenses consist primarily of salaries and related benefits, including stock-based compensation for our executive, finance, legal, business development, human resource, and support functions. Other general and administrative expenses include allocated facility-related costs not otherwise included in research and development expenses, travel expenses, transaction costs, and professional fees for auditing, tax, and legal services.

Non-Cash Interest Expense for the Sale of Future Royalties

Non-cash interest expense for the sale of future royalties consists of interest related to the liability for the sale of future royalties, as well as the amortization of debt issuance costs. We impute interest on the unamortized portion of the liability for the sale of future royalties using the effective interest method and record interest expense based on timing of the payments over the term of the Jemperli Royalty Monetization Agreement and the Zejula Royalty Monetization Agreement (the “Royalty Monetization Agreements”). Our estimate of the interest rate under the arrangements is based on forecasted royalty and milestone payments expected to be made over the life of the agreements.

Interest Income

Interest income consists primarily of interest earned on our short-term and long-term investments and is recognized when earned.

Critical Accounting Policies and Use of Estimates

Our management’s discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). The preparation of these financial statements requires us to make judgments and estimates that affect the reported amounts of assets, liabilities, revenues, and expenses and the disclosure of contingent assets and liabilities in our financial statements. We base our estimates on historical experience, known trends and events, and various other factors that are believed to be reasonable under the circumstances. Actual results may differ from these estimates under different assumptions or conditions. On an ongoing basis, we evaluate our judgments and estimates in light of changes in circumstances, facts, and experience. We believe there have been no significant changes in our critical accounting policies as discussed in our Annual Report on Form 10-K filed with the SEC on March 3, 2026.

Results of Operations - Comparison of the Three Months Ended March 31, 2026 and 2025

Collaboration Revenue

Collaboration revenue consists of milestone payments, royalty payments, upfront license fees and transition services provided under our collaboration agreements. We recognized no milestone revenue during each of the three months ended March 31, 2026 and 2025. We expect that any collaboration revenue we generate will continue to fluctuate from period to period as a result of the timing and amount of milestones from our existing collaborations.

Royalty revenue is a function of our partners’ product sales and the applicable royalty rate. During the three months ended March 31, 202

[Excerpt truncated for page length; source filing is linked above.]

Latest 10-K MD&A

Extracted from Item 7 to the first post-MD&A boundary after HTML sanitization. Confidence: high. Filing date: 2026-03-03. Report date: 2025-12-31.

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

You should read the following discussion and analysis of our financial condition and results of operations together with the historical consolidated financial statements and the notes thereto included in Part II, Item 8—Consolidated Financial Statements and Supplementary Data of this Annual Report on Form 10-K. This discussion and other sections of this Annual Report contain forward-looking statements that involve risks and uncertainties, such as our plans, objectives, expectations, intentions, and beliefs. Our actual results could differ materially from those discussed in these forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those identified below and those discussed in the section entitled “Risk Factors” included in Part I, Item 1A of this Annual Report. You should also carefully read “Special Note Regarding Forward-Looking Statements”.

Overview

We are a clinical-stage biotechnology company focused on delivering innovative immunology therapeutics for autoimmune and inflammatory diseases. Our clinical-stage pipeline includes rosnilimab, a selective pathogenic T cell depleter, for which we completed a Phase 2b trial for the treatment of moderate-to-severe rheumatoid arthritis (“RA”), ANB033, a CD122 antagonist, in a Phase 1b trial for celiac disease (“CeD”) and eosinophilic esophagitis (“EoE”), and ANB101, a BDCA2 modulator, in a Phase 1a trial. We also discovered and out-licensed, in financial collaborations, multiple therapeutic antibodies, including a PD-1 antagonist (Jemperli (dostarlimab-gxly) or “Jemperli”) to GSK and an IL-36R antagonist (imsidolimab) to Vanda Pharmaceuticals Inc. (“Vanda”). We currently recognize revenue from milestones and royalties achieved under our immuno-oncology collaboration with GSK and license and transition services revenue from our collaboration with Vanda.

Intention to Separate Company

In September 2025, we announced that our board of directors (“Board of Directors”) approved plans to explore separating our business into two independent, publicly traded companies. One company is expected to hold and continue to manage the financial collaboration for Jemperli from GSK and for imsidolimab from Vanda, with a focus on protecting and returning value of the royalties to its shareholders. The other company is expected to be a clinical-stage biotechnology company focused on the development and potential commercialization of innovative therapeutics for autoimmune and inflammatory diseases, including rosnilimab, ANB033 and ANB101. Upon completion of the proposed separation, which we expect to complete in the second quarter of 2026, we intend to launch the clinical-stage biotechnology company with adequate capital to fund operations for at least twelve months after the date the proposed separation is completed. While the proposed separation is anticipated to be a taxable event, we are focused on minimizing overall corporate and shareholder-level taxes across the entire transaction. Completion of the proposed separation is subject to final approval by our Board of Directors and other customary conditions, including the effectiveness of a registration statement with the Securities and Exchange Commission (the “SEC”).

Our Wholly Owned Clinical-Stage Pipeline

Our antibodies are in development to treat inflammatory diseases. We believe these molecules have potential applicability across a broad range of autoimmune and inflammatory diseases, including in gastroenterology, rheumatology, dermatology, respiratory, and other therapeutic areas.

Rosnilimab

Rosnilimab is an IgG1 antibody that directly targets pathogenic T cells, such as activated Tph/Tfh and T effector cells, in the periphery or inflamed tissue. These T cells, when activated, proliferate and migrate, and secrete the inflammatory cytokines that are the drivers of autoimmune and inflammatory diseases. Rosnilimab is designed to selectively deplete pathogenic T cells in both inflamed tissue and the periphery while sparing non-pathogenic T cells, including naïve T cells, to preserve overall immune function and restore immune homeostasis. This drives specific immunological outcomes, such as a reduction in T cell proliferation, migration and cytokine secretion, and a reduction of plasma cell generation and autoantibody levels. We announced top-line data from a healthy volunteer Phase 1 trial of rosnilimab in November 2021 that supported advancement of rosnilimab into subsequent patient trials. A total of 144 subjects were enrolled in the randomized, double-blind, placebo-controlled healthy volunteer Phase 1 trial, where single ascending dose (“SAD”) cohorts received subcutaneous (“SC”) or intravenous (“IV”) single doses of rosnilimab up to 600mg or placebo, while multiple ascending dose (“MAD”) cohorts received four weekly subcutaneous doses of rosnilimab ranging up to 400mg or placebo. Rosnilimab was generally well-tolerated and no dose-limiting toxicities were observed. Rosnilimab demonstrated a sustained systemic exposure and dose-proportionality with an estimated two-week half-life for subcutaneous and IV routes of administration.

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In February 2025, we announced initial data, which was subsequently updated in June 2025, from rosnilimab’s randomized, placebo-controlled, global 424-patient, Phase 2b clinical trial for moderate-to-severe rheumatoid arthritis. Patients were randomized to receive either 100mg of subcutaneous rosnilimab every four weeks (Q4W), 400mg Q4W, 600mg every two weeks, or placebo.

During the three-month placebo-controlled period, the trial achieved its primary endpoint by observing the reduction of disease activity using the disease activity score, 28 joints (DAS-28) C-Reactive Protein (“CRP”) score, as well as ACR20 response (an accepted Phase 3 registrational endpoint), at Week 12 in all three doses of rosnilimab compared to placebo. Rosnilimab achieved its secondary endpoint by demonstrating statistical significance in at least one dose and numerical superiority at all doses, including once monthly administration, on ACR20, ACR50 and with respect to the clinical disease activity index (“CDAI”) low disease activity (“LDA”) score at Week 12. Specifically, at Week 12, ACR20 achieved statistical significance at 100 mg (p 0.05), 400 mg (p 0.01), and 600 mg (p 0.001); ACR50 achieved statistical significance at 600 mg (p 0.05); and CDAI LDA achieved statistical significance at 100 mg (p 0.05) and 400 mg (p 0.01).

Following completion of the Week 14 visit, 69% (or 220 of the 318) rosnilimab-treated patients who achieved CDAI LDA at this timepoint continued their assigned treatment through six months in a blinded, all-active treatment period. At six months, rosnilimab results demonstrated deepening of responses through six months on CDAI LDA, CDAI remission and ACR70 and independent of prior treatments, including anti-TNFα, anti-IL6R or JAK inhibitors. Importantly, this was particularly observed in b/tsDMARD-experienced patients for the 400mg Q4W and 600mg Q2W doses, showing a dose response relative to the 100mg Q4W dose. Furthermore, Week 28 clinical responses across multiple measures, including CDAI LDA, mean CDAI, mean DAS28-CRP and ACR50/70, were durable off-drug through at least three months after the last rosnilimab dose, results which we believe suggest the potential for extended dosing (e.g., Q8W/Q12W) after initial monthly dosing. Due to the trial design, max response rates for rosnilimab have not yet been observed as strict criteria at Week 14, which prevented additional patients with meaningful improvement from continuing treatment in the trial.

A table summarizing the results for primary and secondary endpoints follows:

Efficacy Measure

Placebo

Rosnilimab

100mg Q4W

Rosnilimab

400mg Q4W

Rosnilimab

600mg Q2W

(N=106)

(N=106)

(N=107)

(N=105)

Primary Endpoint

DAS28-CRP at Week 12

(mean change from baseline)

-1.69

-2.06

**

-2.12

**

-2.06

**

Select Secondary Endpoint^ (% of participants)

ACR20 at Week 12^

52.8

68.9

*

70.1

**

75.2

***

ACR50 at Week 12^

33

44.3

36.4

46.7

*

Week 28

—

45.3

48.6

58.1

ACR70 at Week 12^

17.9

21.7

21.5

21.9

Week 28

—

40.6

36.4

44.8

CDAI ≤10 (LDA) at Week 12^

31.1

46.2

*

49.5

**

38.1

Week 28

—

52.8

54.2

62.9

Select Exploratory Endpoints (Mean Change from Baseline)

DAS28-CRP

Week 28

—

-2.51

-2.51

-2.57

hs-CRP

Week 12

-0.73

-9.67

***

-10.10

***

-7.60

**

Week 28

—

-7.23

-10.55

-5.98

Patient Global Assessment

Week 12

-25.4

-30.1

-30.5

-34.7

**

Week 28

—

-35.9

-38.4

-40.7

HAQ-DI (range 0-3)

Week 12

-0.56

-0.61

-0.59

-0.60

Week 28

—

-0.74

-0.75

-0.78

Pain VAS

Week 12

-29

-32.6

-35.3

-39.7

**

Week 28

—

-40

-44.5

-47.2

62

*p0.05

**p0.01

***p0.001

Clinical outcomes were further substantiated by objective translational data. An approximately 50% reduction in the mean CRP from baseline, an objective measure of inflammation, was observed through Week 28 in rosnilimab patients who entered the all-active period. Additionally, translational blood and synovial biopsy biomarker data showed differentiated and consistent immunological impact with on-target pharmacological activity in rosnilimab patients that was not observed on placebo. In blood, rosnilimab demonstrated rapid, deep and sustained reductions of approximately 90% in pathogenic T cells (largely Tph, Tph and Teff cells), and an increase in total Tregs. Additionally, synovial biopsies of the most impacted joint taken at baseline and after six weeks showed a deep reduction of approximately 90% in pathogenic T cells (largely Tph cells) at the 400mg Q4W and 600mg Q2W doses, showing a dose response relative to the 100mg Q4W dose.

Consistent with prior rosnilimab studies, all rosnilimab doses through end-of-trial follow up at week 38 demonstrated no treatment-related serious adverse events (“SAEs”), malignancies, anaphylaxis or systemic hypersensitivity, and a low incidence of injection site reactions. Most adverse events (“AEs”) were mild to moderate in severity. Less than 2% of patients in the trial discontinued rosnilimab due to an AE, including only one patient after three months for a moderate headache treated with over-the-counter pain medication. Non-treatment related SAEs observed were consistent with known RA patient history and comorbidities.

ANB033

ANB033 is an antagonist of CD122, the common beta subunit shared by the IL-15 and IL-2 receptors. IL-15 and IL-2 signaling mediate the proliferation and survival of subsets of CD8+ and CD4 T+ cells, NK cells, as well as ILC2s. ANB033 is an antibody designed with an optimal epitope and affinity to CD122 that inhibits IL-15 and IL-2 signaling through both the intermediate affinity IL-2 receptor (comprised of CD122 and the common gamma subunit, CD132) and the high affinity IL-2 receptor (comprised of CD122, CD132 and the alpha receptor subunit for IL-2, CD25) expressed by activated CD4 Th1 and Th2 T cells as well as ILC2. Antagonizing CD122 has the potential to achieve and maintain remission of inflammation through the reduction of disease-causing cytolytic CD8 T cell subsets, including intraepithelial lymphocytes, NK cells and reducing inflammatory cytokine secretion by activated CD4+ Th1 and Th2 cells, as well as ILC2 cells.

We announced top-line data from a healthy volunteer Phase 1a trial of ANB033 in October 2025 that demonstrated no safety concerns at any dose and a rapid and sustained pharmacokinetic (“PK”) profile. A total of 80 subjects were enrolled in the randomized, double-blind, placebo-controlled healthy volunteer Phase 1 trial, where SAD cohorts received SC or IV single doses of ANB033 or placebo, while MAD cohorts received four weekly SC doses of ANB033. ANB033 was generally well-tolerated and no SAE discontinuations or dose-limiting toxicities were observed in the study. ANB033 demonstrated an estimated two-to-three week half-life and full receptor occupancy for SC and IV routes of administration. A dose response was observed on relevant PD biomarkers. We observed responsive effects with both IV and SC modes of administration, with a 70-75% reduction in CD122-expressing CD8 T cells, which did not result in a meaningful reduction in overall CD8 T cells. Additionally, treatment with ANB033 effectively eliminated all CD122-expressing NK cells, but the overall NK cell count remained above the levels needed to maintain immune competency as not all NK cells in humans express CD122. No overall reductions were observed on regulatory T cell counts in the peripheral blood.

We are conducting a randomized placebo-controlled 60-patient, global Phase 1b trial cohort of ANB033 in CeD. This trial will assess both a cohort of patients with baseline villus height to crypt depth (“Vh:Cd”) ratio greater than 2.0 in a gluten-challenge to assess prevention of further mucosal damage, as well as a cohort of patients with a Vh:Cd ratio less than 2.0, who will not be subjected to a gluten-challenge, to assess the ability to heal mucosal damage in symptom-controlled patients.  The two distinct cohorts will enroll 30 patients each, randomized 1:1 between one dose level of subcutaneously administered ANB033 dose and placebo. Key assessments include safety and tolerability, efficacy assessments including the change in Vh:Cd ratio, IEL counts, and PROs, such as the Celiac Disease Symptom Diary (“CDSD”), as well as PK and immunogenicity.

We are also conducting a randomized placebo-controlled 50-patient, global Phase 1b trial cohort of ANB033 in EoE. This trial will enroll adults who have histologic evidence of EoE with peak eosinophil count ≥15/hpf at the screening endoscopy and with symptomatic dysphagia. Key assessments include safety and tolerability, efficacy assessments including the Dysphagia Symptom Questionnaire (“DSQ”) and peak esophageal intraepithelial eosinophilic count (“eos/hpf”), as well as PK and immunogenicity.

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ANB101

ANB101 is a blood dendritic cell antigen 2 (“BDCA2”) modulator antibody that targets plasmacytoid dendritic cells (“pDCs”) and inhibits interferon secretion and modulates antigen presentation for the treatment of autoimmune and inflammatory diseases. BDCA2 is a molecule specifically expressed on pDCs, a class of immune cells which, while found in relatively small numbers in healthy individuals, are enriched in patients with a variety of inflammatory diseases, that is critical to the regulation of toll-like receptor signaling and interferon secretion. pDCs are a key upstream node in the inflammatory cascade that serve as a bridge between innate and adaptive immunity. They have been shown to be prolific secretors of type I interferons, which drive activation of a variety of downstream cell types including T cells and monocytes. Together with their ability to present antigens to the adaptive immune system, this creates a pro-inflammatory environment for the establishment and perpetuation of autoimmune pathology. BDCA2 has been implicated in the pathophysiology of systemic lupus erythematosus (“SLE”), where there exists mechanistic clinical proof of concept for pDC modulation.

We initiated a Phase 1 clinical trial of ANB101 in healthy volunteers in March 2025 and the trial is ongoing. ANB101 preclinical data suggests it is a more potent antibody compared to litifilimab with a longer half-life that results in a deeper and more durable PD effect on pDC depletion.

Collaborative Programs

GSK Collaboration

Multiple company-discovered antibody programs have been advanced to preclinical and clinical milestones under our collaborations. Our collaborations include an immuno-oncology-focused collaboration with GSK.

Under the GSK Agreement, a Biologics License Application (“BLA”) for our most advanced partnered program, which is a PD-1 antagonist antibody called Jemperli (dostarlimab), was approved by the FDA in April 2021 for the treatment of advanced or recurrent deficient mismatch repair endometrial cancer (“dMMREC”). In February 2023, the FDA granted full approval for this indication (from an accelerated approval). In addition, in April 2021, the European Medicines Agency (“EMA”) granted conditional marketing authorization in the European Union (“EU”) for Jemperli for use in women with mismatch repair deficient (“dMMR”)/microsatellite instability-high (“MSI-H”) recurrent or advanced endometrial cancer who have progressed on or following prior treatment with a platinum containing regimen. A second FDA approval was received in August 2021 for Jemperli in pan-deficient mismatch repair tumors (PdMMRT). In July 2023, the FDA approved Jemperli in combination with chemotherapy for the treatment of adult patients with dMMR MSI-H primary advanced or recurrent endometrial cancer. In December 2023, the EMA approved Jemperli plus chemotherapy for dMMR/MSI-H primary advanced or recurrent endometrial cancer. In August 2024, the FDA approved Jemperli plus chemotherapy for all adult patients with primary advanced or recurrent endometrial cancer. In January 2025, the EMA approved Jemperli plus chemotherapy for this same indication. In October 2025, GSK terminated the TIM-3 antagonist antibody development program under our existing collaboration, and all rights to the TIM-3 antagonist antibody will be reverted to us in the near future.

For the year ended December 31, 2025, GSK reported $1.1 billion in sales for Jemperli, a greater than 80% sales growth when compared to $598.0 million for the year ended December 31, 2024.

Vanda Collaboration

On January 31, 2025, we entered into an Exclusive License Agreement (the “Vanda License Agreement”) with Vanda pursuant to which we granted to Vanda an exclusive, global license for the development and commercialization of imsidolimab (IL-36R antagonist mAb), which has completed two registration-enabling global Phase 3 trials, GEMINI-1 and GEMINI-2, evaluating the safety and efficacy of imsidolimab in patients with generalized pustular psoriasis (“GPP”).

In December 2025, Vanda announced the submission of a BLA to the U.S. FDA for imsidolimab in GPP. The FDA accepted the BLA filing for imsidolimab in GPP in February 2026 with a target action date of December 12, 2026.

Pursuant to the terms of the Vanda License Agreement, we received an upfront payment of $10.0 million and a $5.0 million payment for existing drug supply. We are also eligible to receive a 10% royalty on net sales, as well as the following milestones under the Vanda License Agreement:

For more information about these collaborations, see “— Collaborations” included in Part I, Item 1 of this Annual Report.

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Financial Overview

As of December 31, 2025, we had an accumulated deficit of $772.6 million, primarily as a result of losses incurred since our inception in 2005. We expect to continue to incur net operating losses for at least the next several years as we advance our products through clinical development, seek regulatory approval, prepare for and, if approved, proceed to, commercialization, expand our operations and facilities and grow in new and existing markets, territories and industries.

For our discussion related to the results of our operations and liquidity and capital resources for fiscal year ended December 31, 2024 compared to the year ended December 31, 2023, please refer to Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for the year ended December 31, 2024.

Collaboration Revenue

We have not generated any revenue from product sales. Our revenue has been derived from amortization of upfront license payments, research and development funding, milestone and royalty payments under collaboration and license agreements with our collaborators. From inception through December 31, 2025, we have recognized $581.1 million in revenue from our collaborators.

Collaboration and Exclusive License Agreement with GSK

In March 2014, we entered into a Collaboration and Exclusive License Agreement (the “GSK Agreement”) with TESARO, Inc. (“Tesaro”), an oncology-focused biopharmaceutical company now a part of GSK (Tesaro and GSK are hereinafter referred to, collectively, as “GSK”). Currently, under the GSK Agreement, GSK is developing Jemperli (dostarlimab) as a monotherapy and in combination with additional therapies, for various solid tumor indications.

For Jemperli, the remaining development program under the GSK Agreement, we are eligible to receive milestone payments if a European regulatory submission and approval in a second indication is achieved. On October 23, 2020, Amendment No. 3 to the GSK Agreement (the “GSK Amendment No. 3”) was agreed to by both parties to permit GSK to conduct development and commercialization in combination with any third party molecules of Zejula, an oral, once-daily poly (ADP-ribose) polymerase (PARP) inhibitor (“Zejula”). Under GSK Amendment No. 3, we were granted increased royalties upon sales of Jemperli, equal to 8% of net sales (as defined in the GSK Agreement) below $1.0 billion, 12% of net sales between $1.0 billion and $1.5 billion, 20% of net sales between $1.5 billion and $2.5 billion and 25% of net sales above $2.5 billion. Unless earlier terminated by either party upon specified circumstances, the GSK Agreement will terminate, with respect to each specific developed product, upon the later of the 12th anniversary of the first commercial sale of the product or the expiration of the last to expire of any patent.

In October 2021, we signed a royalty monetization agreement (“Jemperli Royalty Monetization Agreement”) with Sagard Healthcare Royalty Partners, LP (“Sagard”). Under the terms of the Jemperli Royalty Monetization Agreement, we received $250.0 million in exchange for royalties and milestones payable to us under our GSK collaboration on annual global net sales of Jemperli.

In May 2024, we entered into an amendment to the Jemperli Royalty Monetization Agreement, Amendment No. 1 (the “Jemperli Amendment”) under which we sold additional receivables to Sagard in exchange for $50.0 million. The Jemperli Amendment includes all Jemperli sales, including any product containing Jemperli, whether or not such product constitutes a combination product, and the threshold amounts of aggregate Jemperli royalties and milestones to be received by Sagard under the Jemperli Amendment is either $600.0 million if received by the end of March 31, 2031, or $675.0 million if received thereafter. Once either of these thresholds are met, the Jemperli Royalty Monetization Agreement and the Jemperli Amendment will expire, resulting in us regaining all subsequent Jemperli royalties and milestones. As of December 31, 2025, Sagard has accrued approximately $250.0 million in royalties and milestones. For more information see Note 5 — Sale of Future Royalties in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Consolidated Financial Statements and Supplementary Data” of this Annual Report on Form 10-K.

The GSK Agreement, as amended, expires when no further payments are due to us, unless earlier terminated. Either party may terminate the GSK Agreement, as amended, in the event of an uncured material breach by the other party. GSK may terminate the GSK Agreement, as amended, at any time upon 90 days’ prior written notice to us.

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Milestones under the GSK Agreement are as follows:

PD-1

(Jemperli/Dostarlimab)

Milestone Event

Amount

Quarter Recognized

Initiated in vivo toxicology studies using good laboratory practices (GLPs)

$1.0M

Q2'15

IND clearance from the FDA

$4.0M

Q1'16

Phase 2 clinical trial initiation

$3.0M

Q2'17

Phase 3 clinical trial initiation - first indication

$5.0M

Q3'18

Phase 3 clinical trial initiation - second indication

$5.0M

Q2'19

Filing of the first BLA(1) - first indication

$10.0M

Q1'20

Filing of the first MAA(2) - first indication

$5.0M

Q1'20

Filing of the first BLA - second indication

$10.0M

Q1'21

First BLA approval - first indication

$20.0M

Q2'21

First MAA approval - first indication

$10.0M

Q2'21

First BLA approval - second indication

$20.0M

Q3'21

Filing of the first MAA - second indication(3)

$5.0M

—

First MAA approval - second indication(3)

$10.0M

—

First commercial sales milestone(3)

$15.0M

Q3'24

Second commercial sales milestone(3)

$25.0M

Q4'24

Third commercial sales milestone(3)

$50.0M

Q3'25

Fourth commercial sales milestone(4)

$75.0M

Q4'25

Milestones recognized through December 31, 2025

$258.0M

—

Milestones that may be recognized in the future

$15.0M

—

(1)
Biologics License Application (“BLA”)

(2)
Marketing Authorization Application (“MAA”)

(3)
For Jemperli, the filing and approval of the first MAA for a second indication and first three commercial sales milestones are included as part of the royalty monetization agreement with Sagard. For more information, see Note 5.

(4)
For Jemperli, we retained the rights to a $75.0 million sales milestone when Jemperli annual net sales exceeded $1 billion. We received the cash milestone payment in December 2025.

In connection with the 2020 Amendment, in October 2020 GSK agreed, under the terms of a settlement agreement (the “GSK Settlement Agreement”), to pay us a royalty on all GSK net sales of Zejula starting January 1, 2021. Under the GSK Settlement Agreement, the royalty is paid at a rate of 1% but is subject to reduction due to royalties paid to third parties, with a minimum royalty payable under the GSK Settlement Agreement of 0.5% of global net sales of Zejula. The current effective royalty rate is 0.5%. In September 2022, we signed a royalty monetization agreement (the “Zejula Royalty Monetization Agreement”) with a wholly owned subsidiary of DRI Healthcare Trust (“DRI”) to monetize all of our future royalties on global net sales of Zejula under the GSK Settlement Agreement. Under the terms of the Zejula Royalty Monetization Agreement, we received $35.0 million in exchange for all royalties payable by GSK to us under the GSK Settlement Agreement on global net sales of Zejula starting in July 2022.

We are currently party to litigation with GSK with respect to the GSK Agreement. See Item 3. “Legal Proceedings” for additional information.

Research and Development Expense

Research and development expenses consist of costs associated with our research and development activities, preclinical and clinical development of our programs, and manufacturing. Our research and development expenses include:

•
External research and development expenses incurred under arrangements with third parties, such as contract research organizations (“CROs”), consultants, members of our scientific and therapeutic advisory boards, and contract manufacturing organizations (“CMOs”);

•
Employee-related expenses, including salaries, benefits, travel, and stock-based compensation;

66

•
Facilities, depreciation and other allocated expenses, which include direct and allocated expenses for rent and maintenance of facilities, depreciation of leasehold improvements and equipment, and laboratory supplies; and

•
License and sub-license fees.

We may also incur in-process research and development expense as we acquire assets from other parties. Acquired in-process research and development costs that have no alternative future use are immediately expensed.

We expense research and development costs as incurred. We account for nonrefundable advance payments for goods and services that will be used in future research and development activities as expense when the service has been performed or when the goods have been received.

We are conducting research and development activities primarily on inflammation programs. We have a research and development team that conducts antibody characterization, translational studies, IND-enabling preclinical studies, and clinical development. We conduct some of our preclinical activities internally and plan to rely on third parties, such as CROs and CMOs, for the execution of certain of our research and development activities, such as in vivo toxicology and pharmacology studies, drug product manufacturing, and clinical trials.

We expect our research and development expenses to be consistent for the foreseeable future as we continue to advance our product candidates.

General and Administrative Expense

General and administrative expenses consist primarily of salaries and related benefits, including stock-based compensation for our executive, finance, legal, business development, human resource, and support functions. Other general and administrative expenses include allocated facility-related costs not otherwise included in research and development expenses, travel expenses, transaction costs, and professional fees for auditing, tax, and legal services.

Non-Cash Interest Expense for the Sale of Future Royalties

Non-cash interest expense for the sale of future royalties consists of interest related to the liability for the sale of future royalties, as well as the amortization of debt issuance costs. We impute interest on the unamortized portion of the liability for the sale of future royalties using the effective interest method and record interest expense based on timing of the payments over the term of the Jemperli Royalty Monetization Agreement and the Zejula Royalty Monetization Agreement (the “Royalty Monetization Agreements”). Our estimate of the interest rate under the arrangements is based on forecasted royalty and milestone payments expected to be made over the life of the agreements.

Interest Income

Interest income consists primarily of interest earned on our short-term and long-term investments and is recognized when earned.

Net Operating Loss and Research and Development Tax Credit Carryforwards

Since inception, we have accumulated net operating losses (“NOLs”) in all years except December 31, 2024, 2022, 2015 and 2014, in which we generated taxable income primarily attributable to our collaboration agreement with GSK, our Zejula Royalty Monetization Agreement in 2022, and the requirement to capitalize and amortize R&D expenditures for tax purposes in 2022 and 2024. While we utilized NOLs in 2024, 2022, 2015 and 2014, we continue to incur losses and therefore continue to have a valuation allowance against our net deferred tax assets due to the uncertainty of the realization of such assets.

As of December 31, 2025, we had federal and state NOL carryforwards of $323.5 million and $69.8 million, respectively. The federal and state NOLs generated prior to 2018 will begin to expire in 2031 and 2028, respectively, unless previously utilized. The federal NOL includes $284.9 million of net operating losses generated in 2018 and after. Federal net operating losses generated in 2018 and after carryover indefinitely and may generally be used to offset up to 80% of future taxable income. As of December 31, 2025, we had federal and state research tax credit carryforwards of approximately $24.0 million and $21.1 million, respectively. The federal research tax credit carryforwards will begin to expire in 2041 and the state research tax credits will begin to expire in 2039.

We experienced ownership changes as defined by Section 382 of the Code during 2007, 2017 and 2021. As a result, as of December 31, 2025, there are $154.1 million of federal NOLs available to offset taxable income in future years without Section 382 limitation, while $169.4 million of federal NOLs are subject to annual limitations over future periods. State NOL and credit carryforwards may be similarly limited.

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The above NOL carryforward and the federal and state research tax credit carryforwards may be subject to an annual limitation under section 382 and 383 of the Internal Revenue Code of 1986, as amended (the “Code”), and similar state provisions if we experience one or more ownership changes which would limit the amount of NOL and tax credit carryforwards that can be utilized to offset future taxable income and tax, respectively. In general, an ownership change as defined by Section 382 and 383, results from transactions increasing ownership of certain stockholders or public groups in the stock of the corporation by more than 50 percentage points over a three-year period.

Critical Accounting Policies and Use of Estimates

Our management’s discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). The preparation of these financial statements requires us to make judgments and estimates that affect the reported amounts of assets, liabilities, revenues, and expenses and the disclosure of contingent assets and liabilities in our financial statements. We base our estimates on historical experience, known trends and events, and various other factors that are believed to be reasonable under the circumstances. Actual results may differ from these estimates under different assumptions or conditions. On an ongoing basis, we evaluate our judgments and estimates in light of changes in circumstances, facts, and experience.

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

Revenue Recognition

Revenue is recognized in accordance with Accounting Standards Codification (“ASC”) 606, which utilizes five basic steps to determine whether revenue can be recognized and to what extent: (i) identify the contract with a customer; (ii) identify the performance obligation; (iii) determine the transaction price; (iv) allocate the transaction price; and (v) determine the recognition period.

Performance Obligations. We evaluate promised goods or services on a contract-by-contract basis to determine whether each deliverable represents a good or service that is distinct or has the same pattern of transfer as other deliverables. A promised good or service is considered distinct if the customer can benefit from the good or service independently of other goods/services either in the contract or that can be obtained elsewhere, without regard to contract exclusivity, and the entity’s promise to transfer the good or service to the customer is separately identifiable from other promises in the contact. If the promised good or service is not considered distinct, we combine such deliverables and account for them as a single performance obligation. We allocate the consideration to each performance obligation at the inception of the arrangement based on the stand alone selling price.

Our performance obligations may include the following:

•
License Arrangements. The performance obligations under our collaboration and license agreements generally include exclusive or nonexclusive licenses to one or more products generated using our technologies. Licenses for multiple antibodies within a single contract are generally combined as they have substantially the same pattern of transfer to the customer. Historically, our licenses have held no value to the customer, as the antibodies were in the discovery phase and required our expertise for further development. Accordingly, licenses are not considered distinct.

•
Research and Development Services. The performance obligations under our collaboration and license agreements generally include research and development services we perform on behalf of or with our collaborators. As discussed within license arrangements above, our licenses have historically held no value without the research and development services we provide. As we generally only provide research and development services for internally generated antibodies that require a license to be utilized by a third party, our research and development services are not considered distinct.

•
Steering Committee Meetings. The performance obligations under our collaboration and license agreements may also include our participation in a steering committee, which allows us to direct the progression of our discovery programs. As these steering committees would not occur or benefit the customer without the use of our licenses, these are not considered distinct.

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We recognize consideration allocated to a performance obligation as the performance obligation is satisfied, and the determination as to whether consideration is recognized over time or at a point in time is made upon contract inception. For our collaboration agreements, this is generally over the period in which research and development services have been performed. There were no new agreements with performance obligations entered into during the year ended December 31, 2025.

Transaction Price. Our collaboration and license agreements generally include both fixed and variable consideration. Fixed payments, such as those for upfront fees are included in the transaction price at contract value, while variable consideration such as reimbursement for research and development services, milestone and royalty payments are estimated and then evaluated for constraints upon inception of the contract and evaluated on a quarterly basis thereafter. Research and development services are updated for actual invoices. Given the nature of our agreements, milestones are estimated using the most likely amount and are evaluated on a quarterly basis. Upon commercialization, royalty payments are recognized in the period incurred.

Research and Development Expenses

As part of the process of preparing our financial statements, we are required to estimate research and development costs incurred during the period, which impacts the amount of accrued expenses and prepaid balances related to such costs as of each balance sheet date. This process involves reviewing open contracts and purchase orders, communicating with our personnel and service providers to identify services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of the actual cost. The majority of our service providers invoice us monthly in arrears for services performed or when contractual milestones are met. We make estimates of our accrued expenses as of each balance sheet date based on facts and circumstances known to us at that time. We periodically confirm the accuracy of our estimates with the service providers and make adjustments if necessary. The significant estimates in our accrued research and development expenses include the costs incurred for services performed by our vendors in connection with research and development activities for which we have not yet been invoiced.

We base our expenses related to research and development activities on our estimates of the services received and efforts expended pursuant to quotes and contracts with vendors that conduct research and development 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 research and development expense. In accruing service fees, we estimate the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from our estimate, we adjust the accrual or prepaid accordingly. Advance payments for goods and services that will be used in future research and development activities are expensed when the activity has been performed or when the goods have been received rather than when the payment is made.

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

Sale of Future Royalties

We treated the sale of future revenue from the Jemperli Royalty Monetization Agreement, as amended by the Jemperli Amendment, with Sagard and the Zejula Royalty Monetization Agreement with DRI as a liability related to the sale of future royalties on the balance sheet. The recorded upfront proceeds, net of transaction costs, will be amortized under the effective interest rate method over the estimated life of the related expected royalty stream. The liability and the related interest expense are based on our current estimates of future royalties and certain milestones expected to be paid over the life of the agreement. We will periodically assess the expected royalty and milestone payments and to the extent our future estimates or timing of such payments are materially different than our previous estimates, we will prospectively recognize related interest expense. Royalty revenue will be recognized as earned on net sales of Jemperli and Zejula, and we will record the royalty payments made as a reduction of the liability when paid. As such payments are made, the balance of the liability will be effectively repaid over the life of the Jemperli Royalty Monetization Agreement and the Zejula Royalty Monetization Agreement. For further discussion of the sale of future revenue, refer to Note 5 — Sale of Future Royalties in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Consolidated Financial Statements and Supplementary Data” of this Annual Report on Form 10-K.

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Recently Issued Accounting Pronouncements

For further information on recently issued 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, “Consolidated Financial Statements and Supplementary Data” of this Annual Report on Form 10-K.

Results of Operations

Collaboration Revenue

Collaboration revenue was $234.6 million for the year ended December 31, 2025, compared to $91.3 million for the year ended December 31, 2024. A comparison of collaboration revenue is as follows:

Year Ended

December 31,

(in thousands)

2025

2024

Increase

GSK Milestone Revenue

$

75,000

$

—

$

75,000

GSK Milestone Revenue (non-cash)

50,000

40,000

10,000

GSK Royalty Revenue - Jemperli (non-cash)

95,945

47,381

48,564

GSK Royalty Revenue - Zejula (non-cash)

3,917

3,899

18

Vanda License and Transition Services Revenue

9,741

—

9,741

Total collaboration revenue

$

234,603

$

91,280

$

143,323

Collaboration revenue during the year ended December 31, 2025 increased $143.3 million compared to the year ended December 31, 2024 due to an increase of $85.0 million in Jemperli sales milestones, $48.6 million increase in Jemperli and Zejula royalty revenue and $9.7 million increase in Vanda license and transition services revenue.

We expect that any collaboration revenue we generate will continue to fluctuate from period to period as a result of the timing and amount of milestones and royalties from our existing collaborations.

Research and Development Expenses

Research and development expenses were $136.0 million during the year ended December 31, 2025 compared to $163.8 million during the year ended December 31, 2024, for a decrease of $27.8 million. The decrease is primarily attributable to a $21.6 million decrease in clinical expenses and a decrease of $12.0 million in outside services for manufacturing expenses, offset by a $5.5 million increase in salaries and related costs, including a $2.3 million increase in stock compensation expense and a decrease of $0.6 million in recruiting costs, and a $0.9 million increase in other research and development expenses.

We do not track fully burdened research and development costs separately for each of our product candidates. We review our research and development expenses by focusing on external development and internal development costs. External development expenses consist of costs associated with our external preclinical and clinical trials, including pharmaceutical development and manufacturing. Included in preclinical and other unallocated costs are external corporate overhead costs that are not specific to any one program. Internal costs consist of salaries and wages, stock-based compensation and benefits, which are not tracked by product

70

candidate as several of our departments support multiple product candidate research and development programs. The following table summarizes the external costs attributable to each program and internal costs:

Year Ended

December 31,

(in thousands)

2025

2024

Increase/(Decrease)

External Costs

Rosnilimab

$

42,744

$

53,422

$

(10,678

)

ANB033

20,427

12,460

7,967

ANB101

8,138

3,367

4,771

ANB032

48

26,084

(26,036

)

Imsidolimab

(2,273

)

8,284

(10,557

)

Preclinical and other unallocated costs

16,093

14,350

1,743

Total External Costs

$

85,177

$

117,967

$

(32,790

)

Internal Costs

Salaries and wages

33,658

30,424

3,234

Stock compensation

17,135

14,823

2,312

Other internal costs

—

626

(626

)

Total Internal Costs

50,793

45,873

4,920

Total Costs

$

135,970

$

163,840

$

(27,870

)

General and Administrative Expenses

General and administrative expenses were $50.7 million during the year ended December 31, 2025 compared to $42.4 million during the year ended December 31, 2024, for an increase of approximately $8.3 million. The increase is primarily due to a $5.2 million increase in legal expenses due to the GSK lawsuit and activity related to the separation of the business, a $2.5 million increase in transaction costs related to our Vanda License Agreement, a $1.0 million increase in personnel costs, and a $0.8 million net increase in other general and administrative expenses, offset by a $0.9 million decrease in market research costs and a $0.3 million decrease in stock compensation expense.

We expect that our general and administrative expenses may increase for the foreseeable future as we incur costs associated with stock compensation expense, legal, auditing and filing fees, additional insurance premiums, investor relations expenses and general compliance and consulting expenses.

Non-Cash Interest Expense for the Sale of Future Royalties

Interest expense was $79.9 million during the year ended December 31, 2025 compared to $50.1 million during the year ended December 31, 2024. The increase of $29.8 million in non-cash interest expense is primarily due to an increase in the GSK Jemperli sales which changed the expected timing for Sagard to be paid per the Jemperli Royalty Monetization Agreement.

Interest Income

Interest income was $13.5 million during the year ended December 31, 2025 compared to $19.8 million during the year ended December 31, 2024. The decrease of $6.3 million in interest income was primarily related to our short-term and long-term investments. The decrease in interest income is primarily due to the decrease in investment balances, as well as the timing of sales, maturities and purchases of our investments.

Liquidity and Capital Resources

From our inception through December 31, 2025, we have received an aggregate of $1.4 billion to fund our operations, which included $752.4 million from the sale of equity securities, $335.0 million from the sale of future royalties, $324.2 million from our collaboration agreements and $19.1 million from venture debt. As of December 31, 2025, we had $311.6 million in cash, cash equivalents and investments.

In addition to our existing cash, cash equivalents and investments, we are eligible to earn milestone and other contingent payments for the achievement of defined collaboration objectives and certain regulatory and sales-based events, and royalty payments under our collaboration agreements, including the GSK Agreement, the GSK Settlement Agreement, and the Vanda License Agreement. Our ability to earn these milestone and contingent payments and the timing of achieving these milestones is primarily

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dependent upon the outcome of our collaborators’ research and development and sales-based activities. Our rights to payments under our collaboration agreements are our only committed external source of funds.

In October 2021, we signed the Jemperli Royalty Monetization Agreement with Sagard. Pursuant to this transaction, we received a $250.0 million payment upon closing in December 2021, in exchange for Jemperli royalties due to us on annual commercial sales below $1.0 billion and certain future milestones starting in October 2021. In May 2024, we entered into the Jemperli Amendment under which we sold additional receivables to Sagard in exchange for $50.0 million. The Jemperli Amendment includes all Jemperli sales, including any product containing Jemperli, whether or not such product constitutes a combination product, and the threshold amounts of aggregate Jemperli royalties and milestones to be received by Sagard under the Jemperli Amendment is either $600.0 million if received by the end of March 31, 2031, or $675.0 million if received thereafter. Once either of these thresholds are met, the Jemperli Royalty Monetization Agreement and the Jemperli Amendment will expire, resulting in us regaining all subsequent Jemperli royalties and milestones. We treated the sale of future revenue from the Jemperli Royalty Monetization Agreement (as amended) with Sagard as debt, which will be amortized under the effective interest rate method over the estimated life of the related expected royalty stream.

The proceeds received from Sagard of $250.0 million and $50.0 million were recorded as a liability, net of transaction costs of $0.4 million and $0.1 million, which will be amortized over the estimated life of the arrangement using the effective interest rate method. The aggregate future estimated payments, less the $299.5 million, net of proceeds, will be recognized as non-cash interest expense over the life of the agreement. Royalty and milestone revenue will be recognized as earned on net sales of Jemperli, and these payments to Sagard will be recorded as a reduction of the liability when paid. As such payments are made to Sagard, the balance of the liability will be effectively repaid over the life of the Jemperli Royalty Monetization Agreement. For further discussion of the sale of future revenue, refer to Note 5 — Sale of Future Royalties in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Consolidated Financial Statements and Supplementary Data” of this Annual Report on Form 10-K.

In November 2024, we entered into an open market sales agreement with TD Securities (USA) LLC (“TD Cowen”), under which we may offer and sell shares of our common stock up to, an aggregate offering of $100.0 million through TD Cowen as our sales agent. As of December 31, 2025, we had sold no shares under this agreement.

In August 2024, we entered into an underwriting agreement with TD Cowen and Leerink Partners LLC as representatives to the several underwriters listed therein (the “Underwriters”), pursuant to which we issued and sold an aggregate of 2,750,498 shares of our common stock to the Underwriters, at an offering price of $36.50 per share. The net proceeds from these sales were approximately $93.9 million, net of underwriting discounts and commissions and offering expenses of $6.5 million, in the aggregate.

Funding Requirements

We may seek to obtain additional financing in the future through equity or debt financings or through collaborations or partnerships with other companies. If we are unable to obtain additional financing on commercially reasonable terms, our business, financial condition and results of operations will be materially adversely affected.

Our primary uses of capital are, and we expect will continue to be, third party clinical and preclinical research and development services, including manufacturing, laboratory and related supplies, compensation and related expenses, legal, patent and other regulatory expenses, and general overhead costs. We have entered into agreements with certain vendors for the provision of services, including services related to commercial manufacturing, that we are unable to terminate for convenience. Under such agreements, we are contractually obligated to make certain minimum payments to the vendors with the amounts to be based on the timing of the termination and the specific terms of the agreement.

Cash, cash equivalents and investments totaled $311.6 million as of December 31, 2025, compared to $420.8 million as of December 31, 2024. We believe that our existing cash, cash equivalents and investments will fund our current operating plan for at least the next twelve months from the issuance of our consolidated financial statements. We have based this estimate on assumptions that may prove to be wrong, and we could use our capital resources sooner than we expect. Additionally, the process of testing product candidates in clinical trials and seeking regulatory approval is costly, and the timing of progress and expenses in these trials is uncertain.

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Cash Flows

The following table summarizes our cash flows for the years ended December 31, 2025 and 2024:

Year Ended

December 31,

(in thousands)

2025

2024

Net cash provided by (used in):

Operating activities

$

19,697

$

(135,337

)

Investing activities

228,032

95,398

Financing activities

(132,613

)

127,054

Net increase in cash and cash equivalents

$

115,116

$

87,115

Operating Activities

Net cash provided by operating activities during the year ended December 31, 2025 was $19.7 million, primarily due to our net loss of $13.2 million, adjusted for addbacks for non-cash items of $113.6 million which includes stock-based compensation, amortization of operating right-of-use assets, non-cash interest expense, income from marketable securities, and depreciation, offset by decreases in working capital of $80.7 million, which includes decreases related to accounts payable and other liabilities, and operating lease liabilities, partially offset by increases related to receivables from collaborative partners, and prepaid expenses and other assets.

Net cash used in operating activities during the year ended December 31, 2024 was $135.3 million, primarily due to our net loss of $145.2 million, adjusted for addbacks for non-cash items of $76.2 million which includes stock-based compensation, amortization of operating right-of-use assets, non-cash interest expense, and income from marketable securities, offset by decreases in in working capital of $66.3 million.

Investing Activities

Cash provided by investing activities during the year ended December 31, 2025 was $228.0 million, primarily due to the sale and maturities of investments of $424.5 million, offset by the acquisition of investments of $196.4 million and the purchases of property and equipment of approximately $0.1 million.

Cash provided by investing activities during the year ended December 31, 2024 was $95.4 million, primarily due to the sale and maturities of investments of $476.1 million, offset by the acquisition of investments of $380.4 million and the purchases of property and equipment of approximately $0.3 million.

Financing Activities

Cash used by financing activities during the year ended December 31, 2025 was $132.6 million, primarily related to $76.8 million for principal repayments of the liability for the sale of future royalties, $1.5 million for net share settlement of equity awards, $68.6 million paid for repurchases and retirements of common stock, offset by $14.3 million of cash received for the issuance of common stock.

Cash provided by financing activities during the year ended December 31, 2024 was $127.1 million, primarily related to $94.4 million of proceeds received from public offerings, net of underwriters’ fees, $50.0 million received for the sale of future royalties, $6.5 million of cash received for the issuance of common stock, offset by $15.2 million for repayments of the liability for the sale of future royalties, $7.5 million for net share settlement of equity awards, $0.5 million paid for repurchases and retirements of common stock excise tax, and $0.6 million payments for offering and debt issuance costs.

Contractual Obligations

We have entered into agreements with certain vendors for the provision of goods and services, which includes manufacturing services with contract manufacturing organizations and development services with contract research organizations. These agreements may include certain provisions for purchase obligations and termination obligations that could require payments for the cancellation of committed purchase obligations or for early termination of the agreements. The amount of the cancellation or termination payments vary and are based on the timing of the cancellation or termination and the specific terms of the agreement and therefore are cancellable contracts.

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For further information related to our operating lease, see Note 10 — Commitments and Contingencies in the accompanying notes to the consolidated financial statements included in Part II, Item 8, “Consolidated Financial Statements and Supplementary Data” of this Annual Report on Form 10-K.