DEF 14A of IDEAYA Biosciences, Inc., Apr 29, 2026

DEF 14A of IDEAYA Biosciences, Inc.

Filed Apr 29, 2026 · FY20250001193125-26-191501

Open on EDGAR

  1. ELECTION OF DIRECTORS

    ELECTION OF DIRECTORS Our Board is divided into three classes. Each class consists, as nearly as possible, of one-third of the total number of directors, and each class has a staggered, three-year term. Unless the Board determines that vacancies (including vacancies created by increases in the number of directors) shall be filled by the stockholders, and except as otherwise provided by law, vacancies on the Board may be filled only by the affirmative vote of a majority of the directors then in office, even though less than a quorum, or by a sole remaining director. A director elected by the Board to fill a vacancy (including a vacancy created by an increase in the number of directors) shall serve for the remainder of the full term of the class of directors in which the vacancy occurred and until such director’s successor is elected and qualified. The Board currently consists of seven seated directors, divided into the three following classes: • Class I directors: Yujiro S. Hata, M. Garret Hampton, Ph.D., and Catherine J. Mackey, Ph.D., whose current terms will expire at the Annual Meeting; • Class II directors: Terry J. Rosen, Ph.D. and Wendy L. Yarno, whose current terms will expire at the annual meeting of stockholders to be held in 2027; and • Class III directors: Scott W. Morrison, and Jeffrey L. Stein, Ph.D., whose current terms will expire at the annual meeting of stockholders to be held in 2028. At each annual meeting of stockholders, the successors to directors whose terms will then expire will be elected to serve from the time of election and qualification until the third subsequent annual meeting of stockholders or until his or her successor is duly elected and qualified, or until such director’s earlier death, resignation or removal. Mr. Hata, Dr. Hampton, and Dr. Mackey have been nominated to serve as Class I directors and have each agreed to stand for reelection. If elected, Mr. Hata, Dr. Hampton, and Dr. Mackey will each hold office from the date of their election by the stockholders until the third subsequent annual meeting of stockholders or until his or her successor is duly elected and has been qualified, or until such director’s earlier death, resignation or removal. Shares represented by executed proxies will be voted, if authority to do so is not withheld, for the election of each nominee named below. In the event that a nominee should be unavailable for election as a result of an unexpected occurrence, such shares will be voted for the election of such substitute nominee as the Board may propose. Mr. Hata and Drs. Hampton and Mackey agreed to serve if elected, and management has no reason to believe that they will be unable to serve. Directors are elected by a plurality of the votes cast at the meeting. The following table sets forth, for the Class I directors (who are currently standing for re-election), and for our other current directors who will continue in office after the Annual Meeting, information with respect to their ages as of March 31, 2026 and position/office held within the Company:

  2. ELECTION OF DIRECTORS

    | Name | Age | Position/Office Held With the Company | Director Since | | Class I Directors whose terms expire at the Annual Meeting of Stockholders | | | | | Yujiro S. Hata | 51 | President, Chief Executive Officer and Director | 2015 | | M. Garret Hampton, Ph.D.(2) | 60 | Director | 2020 | | Catherine J. Mackey, Ph.D.(1) | 70 | Director | 2022 | | Class II Directors whose terms expire at the 2027 Annual Meeting of Stockholders | | | | | Terry J. Rosen, Ph.D.(1)(2) | 67 | Chair and Director | 2016 | | Wendy L. Yarno(1)(3) | 71 | Director | 2019 | | Class III Directors whose terms expire at the 2028 Annual Meeting of Stockholders | | | | | Jeffrey L. Stein, Ph.D.(1)(3) | 71 | Director | 2015 | | Scott W. Morrison(2)(3) | 68 | Director | 2018 |

  3. ELECTION OF DIRECTORS

    (1) Member of the Compensation Committee. (2) Member of the Nominating and Corporate Governance Committee. (3) Member of the Audit Committee. Set forth below is biographical information for the nominees and each person whose term of office as a director will continue after the Annual Meeting. The following includes certain information regarding our directors’ individual experience, qualifications, attributes and skills that led the Board to conclude that they should serve as directors.

  4. Nominees for Election to a Three-Year Term Expiring at the 2029 Annual Meeting of Stockholders

    Nominees for Election to a Three-Year Term Expiring at the 2029 Annual Meeting of Stockholders Yujiro S. Hata has served as a member of our board of directors and as our President and Chief Executive Officer since June 2015. He launched IDEAYA Biosciences, Inc. as its first employee and Chief Executive Officer, while serving as an Executive-in-Residence at 5AM Ventures, a venture capital firm, from 2015 to 2018. From 2014 to August 2015, he served as Chief Operating Officer at Flexus Biosciences, Inc. and FLX Bio, Inc. (renamed RAPT Therapeutics), both immuno-oncology companies, which he joined as startups and led through Flexus’ acquisition by Bristol-Myers Squibb Co. in April 2015. From 2010 to 2014, including through its acquisition by Amgen Inc. in October 2013, he was Vice President, Corporate Development and Strategy at Onyx Pharmaceuticals, Inc. where he served as Head of Strategy and Strategic Asset Management, and Head of Transactions. From 2002 to 2010, Mr. Hata served as Vice President and Senior Vice President of Business Development, and Chief Business Officer at Enanta Pharmaceuticals, Inc. He earlier served in roles at McKinsey & Company, ImClone Systems Incorporated, and Columbia Medical School. Mr. Hata serves on the board of directors at Enanta Pharmaceuticals, Inc. and Hexagon Bio, Inc. Mr. Hata obtained an M.B.A. at The Wharton School at the University of Pennsylvania and a B.A. in Chemistry from Colorado College. We believe Mr. Hata is qualified to serve as our Chief Executive Officer and on our board of directors due to his experience in biotechnology company leadership and his background in strategy, corporate development and biotechnology company transactions. M. Garret Hampton, Ph.D. has served as a member of our board of directors since June 2020. From June 2020 to September 2024, Dr. Hampton served as President, Clinical Sequencing and Oncology at Thermo Fisher Scientific, responsible for leading the company’s clinical next generation sequencing strategy. Prior to Thermo Fisher, from January 2017 to January 2020, Dr. Hampton was Senior Vice President, Clinical Genomics, at Illumina, Inc., responsible for the development of sequencing-based solutions in oncology, reproductive health and whole genome sequencing for the diagnosis of rare disease. From June 2009 to December 2016, Dr. Hampton worked for Genentech, Inc., as Vice President and Global Head of Oncology Biomarker Development and Companion Diagnostics. Before joining Genentech, Dr. Hampton held a variety of leadership positions at Celgene and The Genomics Institute of the Novartis Research Foundation, focused on drug target discovery, drug development and precision medicine. Before moving into industry, Dr. Hampton was Assistant Professor of Medicine at University of California, San Diego after a 2-year postdoctoral fellowship at the Salk Institute for Biological Studies. Dr. Hampton received his Ph.D. from the Imperial Cancer Research Fund (now Cancer Research UK) under Sir Walter Bodmer. He has authored over 150 peer reviewed articles and reviews, with 10,000 lifetime citations. We believe Dr. Hampton is qualified to serve on our board of directors due to his experience in the biopharmaceutical industry, his research background and experience with both oncology and genome sequencing. Catherine J. Mackey, Ph.D. has served as a member of our board of directors since April 2022. Dr. Mackey previously served as Senior Vice President of Pfizer Worldwide Research and Development and Director of Pfizer's La Jolla Laboratories, where she built Pfizer La Jolla into one of Pfizer's main pharmaceutical research and development sites. Prior to that role, she served as head of Strategic Alliances and Genomic and Proteomic Sciences for Pfizer. Dr. Mackey spent the first part of her career in agricultural biotechnology, including as Vice President of DEKALB Genetics, Inc., an international researcher, producer, and marketer of seed. Dr. Mackey serves on the board of directors of Voyager Therapeutics, a gene therapy and neurology biotechnology company, and previously served on the board of directors of Avid Bioservices, a commercial biologics contract development and manufacturing company. Dr. Mackey received her B.S. and Ph.D. degrees in microbiology from Cornell University. We believe Dr. Mackey is qualified to serve on our board of directors due to her life sciences research, development and operational background, including discovery and development of oncology therapies, and her service on the boards of other public and private biopharmaceutical companies.

  5. THE BOARD OF DIRECTORS RECOMMENDS A VOTE

    THE BOARD OF DIRECTORS RECOMMENDS A VOTE

  6. FOR THE ELECTION OF THE ABOVE NAMED NOMINEES

    FOR THE ELECTION OF THE ABOVE NAMED NOMINEES

  7. Directors Continuing in Office Until the 2027 Annual Meeting of Stockholders

    Directors Continuing in Office Until the 2027 Annual Meeting of Stockholders Terry J. Rosen, Ph.D. has served as a member of our board of directors since January 2016 and chairperson of our board of directors since June 2023. Dr. Rosen currently serves on the board of directors and as the Chief Executive Officer of Arcus Biosciences, Inc., a biopharmaceutical company, positions he has held since April 2015 and May 2015, respectively. He served as the Chief Executive Officer of PACT Pharma, Inc., a biopharmaceutical company, from November 2016 to December 2017. Dr. Rosen served briefly in April 2015 as the Chief Executive Officer of FLX Bio (renamed RAPT Therapeutics). Previously, Dr. Rosen co-founded and served as the Chief Executive Officer of Flexus from October 2013 to April 2015, when it was acquired by Bristol-Myers Squibb. Prior to that, Dr. Rosen was at Amgen from August 2004 to January 2013 where he most recently served as Vice President of Therapeutic Discovery from November 2011 to January 2013. He also worked at Tularik Inc., from October 1993 to August 2004 when it was acquired by Amgen, the Central Research division of Pfizer Inc., or Pfizer, from December 1987 to September 1993, and Abbott Laboratories, from July 1985 to December 1987. Dr. Rosen holds a Ph.D. in Chemistry from the University of California, Berkeley and a B.S. in Chemistry from the University of Michigan. We believe Dr. Rosen is qualified to serve on our board of directors based on his experience in general management and business development and his experience in the field of biosciences. Wendy L. Yarno has served as a member of our board of directors since December 2019. Ms. Yarno retired in September 2008 from Merck & Co, Inc. where she spent 26 years in commercial and human resource positions of increasing seniority, including most recently as Executive Vice President and Chief Marketing Officer. She previously served as General Manager, Cardiovascular / Metabolic U.S. Business Unit and as Executive Vice President, Worldwide Human Health Marketing. From 2010 to 2011, Ms. Yarno was the Chief Marketing Officer of HemoShear LLC, a biotechnology research company. Ms. Yarno currently serves on the board of directors of publicly traded life sciences companies Inovio Pharmaceuticals, Inc., Iovance Biotherapeutics, Inc. and Tarsus Pharmaceuticals, Inc. On March 17, 2026, Ms. Yarno informed Iovance Biotherapeutics she will be retiring from their board of directors at their annual meeting of stockholders currently anticipated to take place in June 2026. She previously served on the board of directors of various other life science companies, including Global Blood Therapeutics, Alder Biopharmaceuticals, Durata Therapeutics, St. Jude Medical, Medivation and MyoKardia. Ms. Yarno received an M.B.A. from Temple University, Fox School of Business, and a B.S. in business administration from Portland State University. We believe Ms. Yarno is qualified to serve on our board of directors based on her extensive experience commercializing pharmaceutical products, and her extensive operational and senior management experience, in the biopharmaceutical industry.

  8. Directors Continuing in Office Until the 2028 Annual Meeting of Stockholders

    Directors Continuing in Office Until the 2028 Annual Meeting of Stockholders Jeffrey L. Stein, Ph.D. has served as a member of our board of directors since October 2015. Dr. Stein was the President and Chief Executive Officer of Cidara Therapeutics, Inc., a biotechnology company, from 2014 until its acquisition by Merck in January 2026. Prior to joining Cidara, Dr. Stein was the President and Chief Executive Officer of Trius Therapeutics, Inc. from 2007 until its acquisition by Cubist Pharmaceuticals, Inc. in September 2013. Dr. Stein was also a venture partner at Sofinnova Ventures, a biotech venture capital fund, from 2005 to 2010. Prior to joining Sofinnova, Dr. Stein was co-founder and Chief Scientific Officer at Quorex Pharmaceuticals, Inc., from 1999 until its acquisition by Pfizer in 2005. He has also served as a Principal Scientist with Diversa, Inc. and The Agouron Institute. Dr. Stein previously served on the board of directors of Paratek Pharmaceuticals, Inc., a biopharmaceutical company. Dr. Stein holds a Ph.D. in Marine Biology from the University of California, San Diego. Dr. Stein conducted his postdoctoral research in bacterial genetics as an Alexander Hollaender Distinguished Postdoctoral Fellow at the California Institute of Technology. Dr. Stein obtained a B.S. in Marine Biology and an M.S. in Biology from California State University, Long Beach. We believe Dr. Stein is qualified to serve on our board of directors due to his expertise, perspective and experience as a founder and executive at public and private pharmaceutical companies, and his expertise in life sciences and venture capital industries. Scott W. Morrison has served as a member of our board of directors since July 2018. From 1996 to December 2015, Mr. Morrison was a partner with Ernst & Young LLP, a public accounting firm, where he also served as U.S. Life Sciences Leader from 2002 to December 2015. Mr. Morrison currently serves on the board of directors of Vera Therapeutics, Inc., Tarsus Pharmaceuticals and Zai Lab Limited. He previously served on the board of directors of Corvus Pharmaceuticals, Inc. Mr. Morrison holds a B.S. in Business Administration from the University of California, Berkeley. He is a Certified Public Accountant (inactive). We believe Mr. Morrison is qualified to serve on our board of directors due to his experience in public accounting and the life sciences industry.

  9. DIRECTOR COMPENSATION

    DIRECTOR COMPENSATION

  10. 2025 Director Compensation Table

    2025 Director Compensation Table The following table sets forth the compensation awarded to, earned by or paid to our non-employee directors who served on our Board during the year ended December 31, 2025. Mr. Hata is also a member of our Board but did not receive any additional compensation for his service as a director. See the “Compensation Discussion and Analysis” section of this proxy statement and the compensation tables and accompanying narrative disclosures that follow for information regarding the compensation paid to Mr. Hata in 2025.

  11. 2025 Director Compensation Table

    | Name | Fees Earned or Paid in Cash ($) | Option Awards ($)(1) | Total ($) | | M. Garret Hampton, Ph.D. | 50,000 | 281,660 | 331,660 | | Susan L. Kelley, M.D.(2) | 25,000 | 230,323 | 255,323 | | Catherine Mackey, Ph.D. | 52,500 | 281,660 | 334,160 | | Scott W. Morrison | 70,000 | 281,660 | 351,660 | | Terry J. Rosen, Ph.D. | 97,500 | 281,660 | 379,160 | | Jeffrey L. Stein, Ph.D. | 70,000 | 281,660 | 351,660 | | Wendy L. Yarno | 62,500 | 281,660 | 344,160 |

  12. 2025 Director Compensation Table

    (1) Amounts reflect the grant date fair value of stock options granted during 2025 computed in accordance with ASC Topic 718, rather than the amounts paid to or realized by the named individual. See Note 9 to our audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2025 for the assumptions used in calculating these amounts. The table below shows the aggregate number of shares of our common stock underlying stock options held as of December 31, 2025 by each non-employee director.

  13. 2025 Director Compensation Table

    | Name | Shares Underlying Options Outstanding at Fiscal Year-End | | M. Garret Hampton, Ph.D. | 96,400 | | Susan L. Kelley, M.D.(2) | 81,400 | | Catherine Mackey, Ph.D. | 74,400 | | Scott W. Morrison | 112,746 | | Terry J. Rosen, Ph.D. | 96,400 | | Jeffrey L. Stein, Ph.D. | 101,738 | | Wendy L. Yarno | 107,400 |

  14. 2025 Director Compensation Table

    (2) In June 2025, Susan L. Kelley voluntarily resigned from the Board of Directors. She retained her option awards granted during 2025.

  15. Narrative Disclosure to Director Compensation Table

    Narrative Disclosure to Director Compensation Table Under our Non-Employee Director Compensation Program (the “Director Compensation Program”), our non-employee directors were entitled to receive cash compensation in 2025 as follows: • An annual cash retainer in the amount of $45,000 per year. • For the non-executive chairperson, an additional annual cash retainer in the amount of $35,000 per year. • For the chairperson of the Audit Committee, an additional annual cash retainer in the amount of $20,000 per year for such chairperson’s service on the Audit Committee and for each non-chairperson member of the Audit Committee, an additional annual cash compensation in the amount of $10,000 per year for such member’s service on the Audit Committee. • For the chairperson of the Compensation Committee, an additional annual cash retainer in the amount of $15,000 per year for such chairperson’s service on the Compensation Committee, and for each non-chairperson member of the Compensation Committee, an additional annual cash retainer in the amount of $7,500 per year for such member’s service on the Compensation Committee. • For the chairperson of the Nominating and Corporate Governance Committee, an additional annual cash retainer in the amount of $10,000 per year for such chairperson’s service on the Nominating and Corporate Governance Committee, and for each non-chairperson member of the Nominating and Corporate Governance Committee, an additional annual cash retainer in the amount of $5,000 per year for such member’s service on the Nominating and Corporate Governance Committee. Each non-employee director will automatically be granted an option to purchase 32,400 shares of our common stock upon appointment to our Board (the “Initial Grant”). Each non-employee director who has served as a member of our Board for at least 120 days as of the date of our annual stockholder meeting will automatically be granted an option to purchase 20,000 shares of our common stock on the date of such annual stockholder meeting (the “Annual Grant”). The Initial Grant will vest in substantially equal monthly installments for three years from the date of grant, subject to continued service through each applicable vesting date. The Annual Grant will vest on the earlier of the first anniversary of the date of grant or the date of the next annual meeting of stockholders, subject to continued service through each applicable vesting date. Under our Director Compensation Program, the vesting of any unvested equity awards held by a non-employee director as of a change in control will automatically accelerate in full.

  16. Role of Compensation Consultant in Determining Executive Compensation

    Role of Compensation Consultant in Determining Executive Compensation When making compensation decisions for fiscal 2025, our Compensation Committee considered advice and data provided by Aon’s Talent Solutions practice, a division of Aon plc (“Aon”), its independent compensation consultant. Aon is retained directly by our Compensation Committee to formalize and implement our compensation philosophy and develop compensation arrangements consistent with that philosophy. The Compensation Committee has assessed the independence of Aon pursuant to SEC rules and Nasdaq listing standards and concluded that Aon’s work for the Compensation Committee does not raise any conflict of interest. In September 2024, following consultation with Aon, our Compensation Committee approved a new peer group (the “2025 Peer Group”) based primarily on an analysis of sector, stage of clinical development, headcount, geography and market capitalization. The 2025 Peer Group consisted of the following companies:

  17. Role of Compensation Consultant in Determining Executive Compensation

    | Arcellx, Inc. | Kura Oncology, Inc. | | Arvinas, Inc. | Kymera Therapeutics, Inc. | | Biohaven Ltd. | Morphic Holding, Inc. | | BridgeBio Pharma, Inc. | Nuvalent, Inc. | | Celldex Therapeutics, Inc. | Relay Therapeutics, Inc. | | Cerevel Therapeutics Holdings, Inc. | Revolution Medicines, Inc. | | Cogent Biosciences, Inc. | Protagonist Therapeutics, Inc. | | Crinetics Pharmaceuticals, Inc. | Syndax Pharmaceuticals, Inc. | | CRISPR Therapeutics AG | Vaxcyte, Inc. | | Denali Therapeutics, Inc. | Xencor, Inc. | | Immunovant, Inc. | |

  18. Role of Compensation Consultant in Determining Executive Compensation

    The 2025 Peer Group was selected by considering publicly-traded, pre-commercial biopharma companies, with a focus on oncology, in the San Francisco/Bay Area, Boston/Cambridge area and other biotech “hub” locations, with market cap between $1.0 billion and $10.0 billion, based on IDEAYA’s market capitalization of approximately $3.2 billion as of August 30, 2024, and headcount between 50 and 450 employees, based on IDEAYA’s headcount of 145 employees at the time. At the time the 2025 Peer Group was approved, our company fell at the 47th percentile based on market capitalization of the 2025 Peer Group and 25th percentile based on the headcount of the 2025 Peer Group. Changes to the 2025 Peer Group from the prior year's peer group were as follows: • Companies removed due to acquisition or misalignment with the updated peer selection criteria: Ambrx Biopharma, Inhibrx Biosciences, RAPT Therapeutics, Replimune Group, Ventyx Biosciences, Zentalis Pharmaceuticals. • Companies added to the 2025 Peer Group based on alignment with the peer selection criteria: Biohaven, BridgeBio Pharma, CRISPR Therapeutics, Kymera Therapeutics, Protagonist Therapeutics. Our Compensation Committee used the 2025 Peer Group to help structure a competitive executive compensation program, by considering the 25th, 50th and 75th percentiles of market data, and made individual compensation decisions based on comparable positions at companies with which we compete for talent. The 2025 Peer Group was considered in establishing our named executive officers’ 2025 compensation, but the Compensation Committee does not establish compensation levels solely based on a review of competitive data. Instead, it believes such data is a useful tool in its deliberations as our compensation policies and practices must be competitive in the marketplace for us to be able to attract, motivate and retain qualified executive officers.

  19. Elements of Our Executive Compensation Program

    | Compensation Element | Compensation Objectives Designed to be Achieved and Key Features | | Base Salary | Base salary attracts and retains talented executives, recognizes individual roles and responsibilities, and provides stable income. | | Annual Performance-Based Incentive Compensation | Annual performance bonuses promote short-term performance objectives and reward executives for their contributions toward achieving those objectives. | | Equity-Based Long-Term Incentive Compensation | Equity compensation, provided in the form of stock options, aligns the long-term interests of our executives with those of our stockholders’ interests, and helps retain executive talent. |

  20. Elements of Our Executive Compensation Program

    In addition, our named executive officers are eligible to participate in our health and welfare programs and our 401(k) plan on the same basis as our other employees. We also maintain severance and change in control arrangements, which aid in attracting and retaining executive talent and help executives to remain focused and dedicated during potential transition periods due to a change in control.

  21. Base Salaries

    Base Salaries The base salaries of our named executive officers are an important part of their total compensation package, and are intended to reflect their respective positions, duties and responsibilities. Base salary is a visible and stable fixed component of our compensation program. Base salaries for our named executive officers were initially established through competitive market data at the time an executive was hired. The Compensation Committee does not have any formal policies for allocating compensation among salary, annual cash incentive awards and long-term incentive equity grants, short- and long-term compensation or among cash and non-cash compensation. Instead, the Compensation Committee exercises judgment to establish a total compensation program for each Named Executive Officer that is a mix of current, short- and long-term incentive compensation, and cash and non-cash compensation, that the Compensation Committee believes is appropriate to achieve the goals of our executive compensation program and our corporate goals and objectives. In setting the elements of compensation, the Compensation Committee considers prior compensation paid and amounts realizable from prior stock-based awards, as well as other benefits provided by the Company. In early 2025 and retroactive to January 1, 2025, our Board approved an annual merit increase to Mr. Hata’s annual base salary of 8.4%, based on the recommendation of our Compensation Committee. At the same time, our Compensation Committee approved annual merit increases to our other named executive officers’ base salaries ranging from 1% to 9%. In establishing 2025 base salaries, the Compensation Committee considered multiple factors including individual and Company performance, competitive market data derived from our peers and tenure. The following table sets forth the base salaries of our named executive officers for fiscal 2025:

  22. Cash-Based Incentive Compensation

    Cash-Based Incentive Compensation We consider annual cash incentive bonuses to be an important component of our total compensation program that emphasizes pay for performance by aligning annual cash compensation with operational achievements, incentivizing our named executive officers to drive performance that supports long-term stockholder value creation. Each named executive officer is eligible to receive an annual performance-based cash bonus based on a specified target annual bonus award amount, expressed as a percentage of the named executive officer’s base salary. In fiscal 2025, our named executive officers participated in our annual cash incentive bonus program at the following target percentages of base salary:

  23. Cash-Based Incentive Compensation

    | Name | 2025 Target Bonus Percentage | | Yujiro S. Hata | 60% | | Joshua Bleharski, Ph.D. | 40% | | Andres Ruiz Briseno | 40% | | Darrin M. Beaupre, M.D., Ph.D. | 40% | | Michael A. White, Ph.D. | 40% | | Douglas B. Snyder | 40% |

  24. Sign-On Bonus

    Sign-On Bonus In connection with Dr. Bleharski’s commencement of employment with us, we paid him a sign-on bonus of $150,000. The sign-on bonus is subject to clawback in the event Dr. Bleharski’s employment with us terminates during the first year of his employment.

  25. Equity-Based Compensation

    Equity-Based Compensation We view equity-based compensation as a critical component of our balanced total compensation program. Equity-based compensation creates an ownership culture among our employees that provides an incentive to contribute to the continued growth and development of our business and aligns interest of executives with those of our stockholders. In February 2025, our Board determined to award stock options to Mr. Hata and our Compensation Committee determined to award stock options to our other named executive officers, in each case under our 2019 Incentive Award Plan (the “2019 Plan”), which as an equity vehicle prioritizes increasing stockholder value, aligning our employees and executives’ interests with those of our stockholders, and promoting a long-term focus. In determining the number of shares underlying options granted to each named executive officer, our Board and Compensation Committee considered peer group data based on the value of competitive equity targets as well as competitive percent of company targets (referencing the 50th and 75th percentile of our peer group for similar positions), the recommendations of our Chief Executive Officer (other than with respect to himself), each executive’s relative scope of responsibility and potential, each executive’s individual performance and demonstrated leadership, Company performance and significant total shareholder value creation during 2024, and internal equity pay considerations. The Committee also evaluated aggregate equity spend / share usage of the 2025 equity program relative to peers and prior years. The exercise price of all stock option awards to named executive officers is equal to the closing price of our stock on the date of the grant. Consistent with our historical practice, and in order to promote both retention and long-term focus of our employees and executives, twenty-five percent (25%) of the shares of our common stock subject to the options vests on the one-year anniversary of the vesting commencement date and one forty-eighth (1/48th) of the shares of common stock subject to the options vest on each monthly anniversary of the vesting commencement date thereafter, in each cases subject to the employee’s or executive’s continued service to the Company through each such vesting date. For our annual equity grants, the vesting commencement date is set as January 1 of the year of grant. The following table sets forth the stock options granted to our named executive officers in the 2025 fiscal year.

  26. Equity-Based Compensation

    | Name | Shares underlying 2025 Stock Options Granted(1) | | Yujiro S. Hata | 600,000 | | Joshua Bleharski, Ph.D. | 250,000 | | Andres Ruiz Briseno | 75,000 | | Darrin M. Beaupre, M.D., Ph.D. | 185,000 | | Michael A. White, Ph.D. | 185,000 | | Douglas B. Snyder | 33,000 |

  27. Employment and Severance Arrangements

    Employment and Severance Arrangements In 2025, we were party to an employment agreement with each of our named executive officers, which provide for severance benefits and payments upon certain terminations without cause or resignations for good reason. Our Board and Compensation Committee believe that these types of arrangements are necessary to attract and retain executive talent in an extremely competitive labor market and are a customary component of executive compensation. In particular, such arrangements can serve to mitigate a potential disincentive for them when they are evaluating a potential acquisition of the Company and can encourage retention through the conclusion of the transaction. The payments and benefits provided under our severance and change in control arrangements are designed to provide our named executive officers with treatment that is competitive with market practices. A description of these arrangements, as well as information on the estimated payments and benefits that our named executive officers would have been eligible to receive as of December 31, 2025, are set forth in “Potential Payments Upon Termination or Change in Control.”

  28. Other Policies and Considerations

    Other Policies and Considerations Compensation Recovery Policy. Our Policy for Recovery of Erroneously Awarded Compensation, provides that we may recover any cash or equity compensation of our executive officers in the event that an accounting restatement to correct our material noncompliance with any financial reporting requirement under securities laws occurs and would have reduced the amount of incentive compensation if known at the time of the award or payout. The recoverable amount is generally such amount that would not have otherwise been earned or paid if the financial results had been properly reported. Insider Trading Compliance Policy. Our Board has adopted an Insider Trading Compliance Policy which provides that no officer, director, employee or consultant, or any immediate family member or any member of the household of any such person, shall purchase or sell any type of security while in possession of material, non-public information relating to the security, whether the issuer of such security is the Company or any other company. This prohibition includes any interest or position relating to put options, call options or short sales, or engaging in hedging transactions. In addition, our Insider Trading Compliance Policy provides that no employee, officer or director may pledge Company securities as collateral to secure loans. This prohibition means, among other things, that these individuals may not hold Company securities in a “margin” account, which would allow the individual to borrow against their holdings to buy securities. We believe our Insider Trading Compliance Policy is reasonably designed to promote compliance with insider trading laws, rules and regulations, and the Nasdaq listing standards. A copy of our Insider Trading Compliance Policy can be found as Exhibit 19.1 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2025. Equity Grant Practices. We do not grant equity awards in anticipation of the release of material nonpublic information or time the release of material nonpublic information for the purpose of affecting the value of executive compensation. During fiscal year 2025, we did not grant stock options, stock appreciation rights, or similar option-like instruments to our named executive officers during the four business days prior to or the one business day following the filing of our periodic reports or the filing or furnishing of a Form 8-K that discloses material nonpublic information.

  29. Tax and Accounting Considerations

    Tax and Accounting Considerations Deductibility of Compensation. Section 162(m) of the Internal Revenue Code disallows a tax deduction for any publicly held corporation for individual compensation exceeding $1 million in any taxable year for “covered employees”, which generally include all named executive officers. While our Board and Compensation Committee may take the deductibility of compensation into account when making compensation decisions, we believe that maintaining the discretion to provide compensation that is non-deductible allows us to provide compensation tailored to the needs of our Company and our named executive officers and is an important part of our responsibilities and benefits our stockholders. Tax Considerations. Our Board and Compensation Committee take into account whether components of the compensation for our executive officers will be adversely impacted by the penalty tax imposed by Section 409A of the Code, and aims to structure these components to be compliant with or exempt from Section 409A to avoid such potential adverse tax consequences. Sections 280G and 4999 of the Code provide that certain executive officers and other service providers who are highly compensated or hold significant equity interests may be subject to an excise tax if they receive payments or benefits in connection with a change in control of the company that exceeds certain prescribed limits, and that we, or a successor, may forfeit a deduction on the amounts subject to this additional tax. We do not provide any executive officer, including any named executive officer with a “gross-up” or other reimbursement payment for any tax liability that he or she might owe as a result of the application of Sections 280G or 4999. Accounting for Share-Based Compensation. We follow Financial Accounting Standard Board Accounting Standards Codification Topic 718 (“ASC Topic 718”) for our share-based compensation awards. ASC Topic 718 requires companies to measure the compensation expense for all share-based payment awards made to employees and directors, including stock options, based on the grant date “fair value” of these awards. This calculation is performed for accounting purposes and reported in the compensation tables below, even though our executive officers may never realize any value from certain of their awards. ASC Topic 718 also requires companies to recognize the compensation cost of their share-based compensation awards in their income statements over the period that an executive officer is required to render service in exchange for the option or other award. REPORT OF THE COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS The material in this report is not “soliciting material,” is not deemed “filed” with the SEC, and is not to be incorporated by reference into any filing of IDEAYA under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended. The Compensation Committee has reviewed and discussed the Compensation Discussion and Analysis included in this Proxy Statement with management. Based on the review and discussions, the Compensation Committee recommended to the Board of Directors that the Compensation Discussion and Analysis be included in this Proxy Statement and the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. Compensation Committee Jeffrey L. Stein, Ph.D., Chair Catherine J. Mackey, Ph.D. Terry J. Rosen, Ph.D. Wendy L. Yarn

  30. Summary Compensation Table

    Summary Compensation Table The following table sets forth information concerning the compensation of our named executive officers for the fiscal years ended December 31, 2025, 2024 and 2023.

  31. Summary Compensation Table

    | Name and Principal Position | Year | Salary ($)(1) | Bonus ($)(2) | Option Awards ($)(3) | Non-Equity Incentive Plan Compensation ($)(4) | All Other Compensation ($)(5) | Total | | Yujiro S. Hata | 2025 | 700,000 | — | 8,418,840 | 378,000 | 15,800 | 9,512,640 | | President and Chief Executive Officer | 2024 | 646,000 | — | 15,946,272 | 323,000 | 15,600 | 16,930,872 | | | 2023 | 598,000 | — | 5,083,440 | 299,000 | 15,000 | 5,995,440 | | Joshua Bleharski, Ph.D.(6) | 2025 | 333,333 | 150,000 | 3,463,975 | 186,000 | 14,014 | 4,147,322 | | Chief Financial Officer | | — | — | — | — | — | — | | Andres Ruiz Briseno | 2025 | 417,000 | — | 1,052,355 | 168,000 | 15,800 | 1,653,155 | | Chief Accounting Officer | 2024 | 382,500 | — | 2,823,819 | 133,875 | 15,600 | 3,355,794 | | | 2023 | 345,000 | — | 927,417 | 125,125 | 15,000 | 1,412,542 | | Darrin M. Beaupre, M.D., Ph.D. | 2025 | 526,500 | — | 2,595,809 | 196,000 | 15,800 | 3,334,109 | | Chief Medical Officer | 2024 | 501,500 | — | 5,315,424 | 228,100 | 15,600 | 6,060,624 | | | 2023 | 473,000 | — | 1,143,774 | 189,200 | 3,377 | 1,809,351 | | Michael A. White, Ph.D. | 2025 | 519,000 | — | 2,595,809 | 193,500 | 15,800 | 3,324,109 | | Chief Scientific Officer | 2024 | 489,500 | — | 4,650,996 | 223,300 | 15,600 | 5,379,396 | | | 2023 | 462,000 | — | 2,096,919 | 184,800 | 15,000 | 2,758,719 | | Douglas B. Snyder | 2025 | 440,000 | — | 463,036 | 164,000 | 64,523 | 1,131,560 | | Chief Legal Officer | | — | — | — | — | — | — |

  32. Summary Compensation Table

    (1) The amount reported for Dr. Bleharski represents his salary earned in 2025 since his hire date of May 1, 2025. (2) Amounts reported represent sign-on bonuses received in connection with the executive officer's initial employment offer. (3) Amounts reported for 2025 reflect the grant date fair value of stock options granted during 2025 computed in accordance with ASC Topic 718, rather than the amounts paid to or realized by the named executive officer. See Note 9 to our audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2025 for the assumptions used in calculating these amounts. (4) Amounts reported for 2025 represent the amounts of the annual performance-based cash bonus earned by our named executive officers based on the achievement of certain corporate performance objectives and individual performance assessment, as applicable, for the fiscal year ended December 31, 2025. Please see the descriptions of the annual performance-based cash bonuses paid to our named executive officers under “2025 Compensation Discussion and Analysis – Cash-Based Incentive Compensation” above. (5) Amounts reported for 2025 for Mr. Hata include $1,800 in cell phone allowance and $14,000 in 401(k) employer matching contributions. Amounts reported for Dr. Bleharski include $1,200 in cell phone allowance and $12,814 in 401(k) employer matching contributions. Amounts reported for Mr. Ruiz Briseno include $1,800 in cell phone allowance and $14,000 in 401(k) employer matching contributions. Amounts reported for Dr. Beaupre include $1,800 in cell phone allowance and $14,000 in 401(k) employer matching contributions. Amounts reported for Dr. White include $1,800 in cell phone allowance and $14,000 in 401(k) employer matching contributions. Amounts reported for Mr. Snyder include $1,800 in cell phone allowance, $49,976 in relocation expenses and $12,747 in employer matching contributions. Of the $49,976 in relocation expenses, $36,852 was reimbursed to Mr. Snyder and $13,124 were taxes paid by the Company on behalf of him. Dr. Bleharski joined the Company in May 2025 as Chief Financial Officer. Amounts reported for his salary were from May 1, 2025, his first date of employment, to December 31, 2025.

  33. Grants of Plan-Based Awards

    Grants of Plan-Based Awards The following table sets forth information concerning the non-equity incentive awards and equity-based awards granted to our named executive officers in 2025.

  34. Grants of Plan-Based Awards

    | Name | Award Type | Grant Date | Estimated Future Payouts Under Non-Equity Incentive Plan Awards: Target ($)(1) | All Other Option Awards: Number of Securities Underlying Options (#)(2) | Exercise or Base Price of Option Awards ($/Sh) | Grant Date Fair value of Stock and Option Awards ($)(3) | | Yujiro S. Hata | 2025 Option Awards | 2/27/2025 | — | 600,000 | 20.24 | 8,418,840 | | | Corporate Bonus | | 420,000 | — | — | — | | Joshua Bleharski, Ph.D.(4) | 2025 Option Awards | 5/29/2025 | — | 250,000 | 20.05 | 3,463,975 | | | Corporate Bonus | | 200,000 | — | — | — | | Andres Ruiz Briseno | 2025 Option Awards | 2/27/2025 | — | 75,000 | 20.24 | 1,052,355 | | | Corporate Bonus | | 166,800 | — | — | — | | Darrin M. Beaupre, M.D., Ph.D. | 2025 Option Awards | 2/27/2025 | — | 185,000 | 20.24 | 2,595,809 | | | Corporate Bonus | | 210,600 | — | — | — | | Michael A. White, Ph.D. | 2025 Option Awards | 2/27/2025 | — | 185,000 | 20.24 | 2,595,809 | | | Corporate Bonus | | 207,600 | — | — | — | | Douglas B. Snyder | 2025 Option Awards | 2/27/2025 | — | 33,000 | 20.24 | 463,036 | | | Corporate Bonus | | 176,000 | — | — | — |

  35. Grants of Plan-Based Awards

    (1) Represents the target annual bonus opportunities for the applicable named executive officer. Our annual bonus program did not provide for threshold or maximum performance opportunities in 2025. For additional detail on our annual bonus program, please see “Compensation Discussion and Analysis – Cash-Based Incentive Compensation” above. (2) Represents stock option awards, which vest and become exercisable as to 25% of the total number of shares underlying the option on the first anniversary of the vesting commencement date and as to 1/48th of the total number of shares underlying the option on each monthly anniversary of the vesting commencement date thereafter, subject to continued service through the applicable vesting date. All stock option awards were from the 2019 Plan, except for Dr. Bleharski's grant in connection with his commencement of employment was from the 2023 Inducement Award Plan (“2023 Plan”). (3) Amounts reported reflect the grant date fair value of stock options granted computed in accordance with ASC Topic 718, rather than the amounts paid to or realized by the named executive officer. See Note 9 to our audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2025 for the assumptions used in calculating these amounts. Dr. Bleharski joined the Company in May 2025 as Chief Financial Officer. The grant disclosed herein was granted to him in connection with his commencement of employment.

  36. Outstanding Equity Awards at Fiscal Year-End

    Outstanding Equity Awards at Fiscal Year-End The following table summarizes the number of shares of common stock underlying outstanding stock options for each named executive officer as of December 31, 2025.

  37. Outstanding Equity Awards at Fiscal Year-End

    | | | Option Awards | | | | | Name | Vesting Commencement Date(1) | Number of Securities Underlying Unexercised Options (#) Exercisable | Number of Securities Underlying Unexercised Options (#) Unexercisable | Option Exercise Price ($) | Option Expiration Date | | Yujiro S. Hata | 2/27/2018 | 49,454 | — | 4.31 | 2/27/2028 | | | 3/13/2019 | 180,862 | — | 11.08 | 3/13/2029 | | | 2/21/2020 | 215,000 | — | 6.92 | 2/21/2030 | | | 2/24/2021 | 182,192 | — | 19.52 | 2/24/2031 | | | 3/1/2022 | 254,581 | 5,419 | 12.86 | 3/1/2032 | | | 2/24/2023 | 291,664 | 108,336 | 17.04 | 2/24/2033 | | | 3/1/2024 | 229,993 | 250,007 | 46.22 | 3/1/2034 | | | 2/27/2025 | — | 600,000 | 20.24 | 2/27/2035 | | Joshua Bleharski, Ph.D. | 5/29/2025 | — | 250,000 | 20.05 | 5/29/2035 | | Andres Ruiz Briseno | 11/1/2021 | 60,000 | - | 22.30 | 11/1/2031 | | | 3/1/2022 | 28,150 | 600 | 12.86 | 3/1/2032 | | | 2/24/2023 | 30,982 | 11,518 | 17.04 | 2/24/2033 | | | 6/29/2023 | 13,589 | 8,911 | 23.23 | 6/29/2033 | | | 3/1/2024 | 40,723 | 44,277 | 46.22 | 3/1/2034 | | | 2/27/2025 | — | 75,000 | 20.24 | 2/27/2035 | | Darrin M. Beaupre, M.D., Ph.D. | 11/21/2022 | 138,742 | 41,258 | 17.48 | 11/21/2032 | | | 2/24/2023 | 65,620 | 24,380 | 17.04 | 2/24/2033 | | | 3/1/2024 | 76,658 | 83,342 | 46.22 | 3/1/2034 | | | 2/27/2025 | — | 185,000 | 20.24 | 2/27/2035 | | Michael A. White, Ph.D. | 10/25/2021 | 200,000 | — | 22.01 | 10/25/2031 | | | 3/1/2022 | 62,072 | 1,928 | 12.86 | 3/1/2032 | | | 2/24/2023 | 120,309 | 44,691 | 17.04 | 2/24/2033 | | | 3/1/2024 | 67,079 | 72,921 | 46.22 | 3/1/2034 | | | 2/27/2025 | — | 185,000 | 20.24 | 2/27/2035 | | Douglas B. Snyder | 9/26/2024 | 43,749 | 96,251 | 30.50 | 9/26/2034 | | | 2/27/2025 | — | 33,000 | 20.24 | 2/27/2035 |

  38. Outstanding Equity Awards at Fiscal Year-End

    Each option vests and becomes exercisable as to 25% of the total number of shares underlying the option on the first anniversary of the vesting commencement date and as to 1/48th of the total number of shares underlying the option on each monthly anniversary of the vesting commencement date thereafter, subject to continued service through the applicable vesting date.

  39. Option Exercises and Stock Vested

    Option Exercises and Stock Vested The following table sets forth information concerning the stock options that were exercised by our named executive officers in 2025. None of our named executive officers held stock awards in 2025.

  40. Option Exercises and Stock Vested

    | Name | Number of Shares Acquired on Exercise (#) | Value Realized on Exercise ($)(1) | | Yujiro S. Hata | 12,808 | 19,238 | | Joshua Bleharski, Ph.D. | — | — | | Andres Ruiz Briseno | — | — | | Darrin M. Beaupre, M.D., Ph.D. | — | — | | Michael A. White, Ph.D. | — | — | | Douglas B. Snyder | — | — |

  41. Option Exercises and Stock Vested

    (1) Computed by determining the difference between the closing trading price of our common stock on the date of exercise and the exercise price of the exercised stock option, multiplied by the number of shares acquired upon exercise of the option.

  42. Potential Payments Upon Termination or Change in Control

    Potential Payments Upon Termination or Change in Control We have entered into employment agreements with each of our named executive officers. The employment agreements provide for initial base salaries (subject to annual increases), target cash incentives, and benefit plan participation. In addition, each employment agreement provides for the following severance and change in control benefits: Mr. Hata. In the event that Mr. Hata’s employment with us is terminated by us without “cause” or he resigns for “good reason” (each, as defined in the employment agreement) outside of a period of time that begins three months prior to and ends 12 months following a change in control, then, subject to timely delivering to us a release of claims, Mr. Hata will be entitled to receive: (i) a lump sum severance payment equal to his annual base salary; and (ii) payment or reimbursement of continued healthcare coverage for up to 12 months following the date of termination. In the event Mr. Hata’s employment with us is terminated by us without “cause” or he resigns for “good reason” during a period of time that begins three months prior to and ends 12 months following a change in control, then, subject to timely delivering to us a release of claims, Mr. Hata will be entitled to receive: (i) a lump sum severance payment equal to 1.5 times his annual base salary and target annual incentive payment; (ii) payment or reimbursement of continued healthcare coverage for up to 18 months following the date of termination; and (iii) full acceleration of his equity awards. Each other named executive officer. In the event that a named executive officer’s employment with us is terminated by us without “cause” or he resigns for “good reason” (each, as defined in the employment agreement) outside of a period of time that begins three months prior to and ends 12 months following a change in control, then, subject to timely delivering to us a release of claims, the named executive officer will be entitled to receive: (i) a lump sum severance payment equal to seventy-five percent of his annual base salary; and (ii) payment or reimbursement of continued healthcare coverage for up to 9 months following the date of termination. In the event the named executive officer’s employment with us is terminated by us without “cause” or he resigns for “good reason” during a period of time that begins three months prior to and ends 12 months following a change in control, then, subject to timely delivering to us a release of claims, the named executive officer will be entitled to receive: (i) a lump sum severance payment equal to his annual base salary and target annual incentive payment; (ii) payment or reimbursement of continued healthcare coverage for up to 12 months following the date of termination; and (iii) full acceleration of his equity awards. As used in the named executive officers’ employment agreements: • “cause” means: the occurrence of any of the following events: (i) the named executive officer’s commission of any felony or any crime involving fraud, dishonesty or moral turpitude under the laws of the United States or any state thereof; (ii) the named executive officer’s attempted commission of, or participation in, a fraud or act of dishonesty against the Company; (iii) the named executive officer’s intentional material violation of any contract or agreement between the named executive officer and the Company or of any statutory duty owed to the Company; (iv) the named executive officer’s unauthorized use or disclosure of the Company’s confidential information or trade secrets; or (v) the named executive officer’s gross misconduct. “change in control” means any of the following types of transactions: (i) the direct or indirect sale or exchange in a single or series of related transactions by the stockholders of the Company of more than fifty percent (50%) of the voting stock of the Company; (ii) a merger or consolidation in which the Company is a party; or (iii) the sale exchange or transfer of all or substantially all of the assets of the Company (each, a “transaction”), wherein the stockholders of the Company immediately before the transaction do not retain immediately after the transaction, in substantially the same proportions as their ownership of shares of the Company’s voting stock immediately before the transaction, direct or indirect beneficial ownership of more than fifty percent (50%) of the total combined voting power of the outstanding voting securities of the Company or the successor entity, or in the case of a transaction described in (iii), the corporation or other entity to which the assets of the Company were transferred, as the case may be. Notwithstanding the foregoing, a transaction shall not constitute a change in control if (i) its sole purpose is to change the state of the Company’s incorporation; (ii) its sole purpose is to create a holding company that will be owned in substantially the same proportions by the persons who held the Company’s securities immediately before such transaction; (iii) it constitutes the Company’s initial public offering for its securities; or (iv) it is a transaction effected primarily for the purpose of financing the Company with cash (as determined by the Board in its discretion). “good reason” means that the named executive officer has complied in all material respects with the “good reason process (defined below) following the occurrence of any of the following events, without the named executive officer’s prior written consent: (i) a material reduction of the named executive officer’s annual base salary (unless pursuant to a salary reduction program applicable generally to the Company’s senior management employees); or (ii) relocation of the named executive officer’s principal place of employment to a place that increases the named executive officer’s one way commute by more than seventy-five (75) miles as compared to the named executive officer’s then current principal place of business immediately prior to such relocation; or (iii) a material reduction in the named executive officer’s job title and primary duties, responsibilities and authorities, provided however, that a change in job position (including a change in title) shall not be deemed a “material reduction” in and of itself unless the named executive officer’s duties are materially reduced from the prior duties. “good reason process” means that (i) the named executive officer has reasonably determined in good faith that a good reason condition has occurred, (ii) the named executive officer has notified the Company in writing of the first occurrence of the good reason condition within 60 days of the first time the named executive officer becomes aware of the occurrence of such condition, (iii) the named executive officer has cooperated in good faith with the Company’s efforts, for a period not less than 30 days following the Company’s receipt of such notice (the “cure period”), to remedy the condition, (iv) notwithstanding such efforts, the good reason condition continues to exist, and (v) the named executive officer terminates employment within 30 days after the end of the cure period. The following table sets forth information concerning the payments and benefits that would be made to our named executive officers assuming a qualifying termination or a qualifying termination following a change in control occurred on December 31, 2025 under the agreements in effect as of this date.

  43. Potential Payments Upon Termination or Change in Control

    | Name | Severance Type | Involuntary Termination Without Cause or Resignation for Good Reason Without Change in Control Period(2) | Involuntary Termination Without Cause or Resignation for Good Reason Within Change in Control Period(2) | | Yujiro S. Hata | Base Salary Severance | $700,000 | $1,050,000 | | | Target Bonus | — | 630,000 | | | Continued Healthcare Coverage | 61,633 | 92,450 | | | Acceleration of Option Awards(1) | — | 35,686,266 | | | Total | $761,633 | $37,248,716 | | Joshua Bleharski, Ph.D. | Base Salary Severance | $375,000 | $500,000 | | | Target Bonus | — | 200,000 | | | Continued Healthcare Coverage | 29,574 | 39,432 | | | Acceleration of Option Awards(1) | — | 3,630,000 | | | Total | $404,574 | $4,369,432 | | Andres Ruiz Briseno | Base Salary Severance | $312,750 | $417,000 | | | Target Bonus | — | 166,800 | | | Continued Healthcare Coverage | 26,432 | 35,242 | | | Acceleration of Option Awards(1) | — | 3,435,288 | | | Total | $339,182 | $4,059,334 | | Darrin M. Beaupre, M.D., Ph.D. | Base Salary Severance | $394,875 | $526,500 | | | Target Bonus | — | 210,600 | | | Continued Healthcare Coverage | 46,225 | 61,633 | | | Acceleration of Option Awards(1) | — | 7,304,950 | | | Total | $441,100 | $8,103,683 | | Michael A. White, Ph.D. | Base Salary Severance | $389,250 | $519,000 | | | Target Bonus | — | 207,600 | | | Continued Healthcare Coverage | 46,225 | 61,633 | | | Acceleration of Option Awards(1) | — | 9,444,940 | | | Total | $435,475 | $10,233,173 | | Douglas B. Snyder | Base Salary Severance | $330,000 | $440,000 | | | Target Bonus | — | 176,000 | | | Continued Healthcare Coverage | 46,225 | 61,633 | | | Acceleration of Option Awards(1) | — | 1,042,690 | | | Total | $376,225 | $1,720,323 |

  44. Potential Payments Upon Termination or Change in Control

    The value of acceleration of option awards was calculated by multiplying the number of accelerated shares of common stock underlying the unvested, in-the-money options by the excess of (i) $34.57, the closing stock price of our common stock as of December 31, 2025, the last trading day of fiscal 2025 and (ii) the per-share exercise price of the unvested stock options. Amounts shown for the Acceleration of Options Awards upon an Involuntary Termination Without Cause or Resignation for Good Reason Within Change in Control Period also represent value of vesting acceleration in the event of a change in control in which stock options were not assumed or substituted. (2) Amounts shown in the table above do not reflect any reduction pursuant to the parachute payment best pay provision, if any, which would be calculated upon actual termination of employment.

  45. Pay Ratio of CEO to Median Employee

    Pay Ratio of CEO to Median Employee As required by Section 953(b) of the Dodd-Frank Wall Street Reform and Consumer Protection Act, and Item 402(u) of Regulation S-K, we are providing information about the relationship of the annual total compensation of our employees (other than our CEO) and the annual total compensation of Yujiro Hata, who served as our CEO as of December 31, 2025. For 2025, our last completed year, the annual total compensation of our CEO was approximately 28 times the median of the annual total compensation of all of our other employees, other than our CEO (the “Pay Ratio”). The median of the annual total compensation of all employees of our Company (other than our CEO) was $335,731. For the purposes of the Pay Ratio calculation, we used our CEO’s total compensation as outlined in the “Summary Compensation Table” above, for a total of $9,512,640. The Company chose December 31, 2025 as the date for establishing the employee population used in identifying the median employee and used the 12 month period from January 1, 2025 through December 31, 2025 as the measurement period. We identified the median employee using the consistently applied compensation measure of the wages and other compensation as reported in Box 1 of Form W-2 for 2025 for each employee. Permanent employees who joined in 2025 and permanent employees who were on leave during 2025 were assumed to have worked for the entire measurement period. We captured all employees as of December 31, 2025, consisting of approximately 144 individuals excluding the CEO, with 100% of these individuals located in the U.S. No cost-of-living adjustments were made. The annual total compensation of the median employee and the annual total compensation of our CEO were calculated in accordance with the requirements of Item 402(c)(2)(x) of Regulation S-K.

  46. Pay Versus Performance

    Pay Versus Performance In accordance with rules adopted by the Securities and Exchange Commission pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, we provide the following disclosure regarding executive compensation for our principal executive officer (“PEO”) and the NEOs other than the PEO (“Non-PEO NEOs”) and Company performance for the fiscal years listed below. The Compensation Committee did not consider the pay versus performance disclosure below in making its pay decisions for any of the years shown.

  47. Pay Versus Performance

    | Year | Summary Compensation Table Total for PEO(1) | Compensation Actually Paid to PEO(1)˒(2)˒(3) | Average Summary Compensation Table Total for Non-PEO NEOs(1) | Average Compensation Actually Paid to Non-PEO NEOs(1), (2), (3) | Value of Initial Fixed $100 Investment based on:(4) | | Net Loss | Cash, Cash Equivalents and Marketable Securities | | | ($) | ($) | ($) | ($) | TSR | Peer Group TSR | ($ Thousands) | ($ Millions)(5) | | | | | | | ($) | ($) | | | | 2025 | 9,512,640 | 15,697,753 | 2,718,051 | 4,240,392 | 246.93 | 124.75 | (113,698) | 1,049.7 | | 2024 | 16,930,872 | 5,805,446 | 4,537,268 | 1,038,390 | 183.57 | 93.49 | (274,477) | 1,082.2 | | 2023 | 5,995,440 | 15,717,471 | 2,015,255 | 4,046,732 | 254.14 | 94.03 | (112,961) | 632.6 | | 2022 | 3,327,004 | 1,791,509 | 2,013,622 | 1,751,673 | 129.79 | 89.90 | (58,655) | 373.1 | | 2021 | 3,848,871 | 7,282,432 | 2,467,285 | 2,370,485 | 168.86 | 100.02 | (49,762) | 368.1 |

  48. Pay Versus Performance

    (1) Yujiro S. Hata was our PEO for each year presented. The individuals comprising the Non-PEO NEOs for each year presented are listed below.

  49. Pay Versus Performance

    | 2021 | 2022 | 2023 | 2024 | 2025 | | Paul A. Stone | Michael A. White, Ph.D. | Paul A. Stone | Michael A. White, Ph.D. | Michael A. White, Ph.D. | | Michael A. White, Ph.D. | Darrin M. Beaupre, M.D., Ph.D. | Michael A. White, Ph.D. | Darrin M. Beaupre, M.D., Ph.D. | Darrin M. Beaupre, M.D., Ph.D. | | Michael Dillon, Ph.D. | | Darrin M. Beaupre, M.D., Ph.D. | Jason S. Throne | Andres Ruiz Briseno | | | | Jason S. Throne | Stuart C. Dorman | Joshua Bleharski, Ph.D. | | | | Andres Ruiz Briseno | Andres Ruiz Briseno | Douglas B. Snyder |

  50. Pay Versus Performance

    (2) The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table Total column with certain adjustments as described in footnote 3 below. (3) Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs. The amounts excluded or included for 2025 are set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards and Option Awards column are the amounts from the Stock Awards and Option Awards columns set forth in the Summary Compensation Table.

  51. Pay Versus Performance

    | Year | Summary Compensation Table Total for PEO | Exclusion of Stock Awards and Option Awards for PEO | Inclusion of Equity Values for PEO | Compensation Actually Paid to PEO | | | ($) | ($) | ($) | ($) | | 2025 | 9,512,640 | (8,418,840) | 14,603,953 | 15,697,753 |

  52. Pay Versus Performance

    | Year | Average Summary Compensation Table Total for Non-PEO NEOs | Average Exclusion of Stock Awards and Option Awards for Non-PEO NEOs | Average Inclusion of Equity Values for Non-PEO NEOs | Average Compensation Actually Paid to Non-PEO NEOs | | | ($) | ($) | ($) | ($) | | 2025 | 2,718,051 | (2,034,197) | 3,556,538 | 4,240,392 |

  53. Pay Versus Performance

    The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:

  54. Pay Versus Performance

    | Year | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for PEO | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for PEO | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for PEO | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for PEO | Total - Inclusion of Equity Values for PEO | | | ($) | ($) | ($) | ($) | ($) | | 2025 | 14,117,506 | 1,279,696 | (793,249) | — | 14,603,953 |

  55. Pay Versus Performance

    | Year | Average Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO NEOs | Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs | Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs | Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs | Total - Average Inclusion of Equity Values for Non-PEO NEOs | | | ($) | ($) | ($) | ($) | ($) | | 2025 | 3,452,564 | 300,026 | (196,052) | — | 3,556,538 |

  56. Pay Versus Performance

    4. The Peer Group TSR set forth in this table utilizes the Nasdaq Biotechnology Index. The comparison assumes $100 was invested for the period starting December 31, 2020, through the end of the listed year in the Company and in the Nasdaq Biotechnology Index, respectively. Historical stock performance is not necessarily indicative of future stock performance. 5. We determined Cash, Cash Equivalents and Marketable Securities to be the most important financial performance measure used to link Company performance to Compensation Actually Paid to our PEO and Non-PEO NEOs in 2025. The 2023 Cash, Cash Equivalents and Marketable Securities amount has been revised from the amounts disclosed in last year’s Pay Versus Performance table due to an inadvertent transposition. Relationship Between Compensation Actually Paid, Company Total Shareholder Return (“TSR”), and Peer Group TSR The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our Non-PEO NEOs, the Company’s cumulative TSR over the five most recently completed fiscal years, and the Nasdaq Biotechnology Index TSR over the same period. Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Net Loss The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our Non-PEO NEOs, and our Net Loss during the five most recently completed fiscal years. Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Cash, Cash Equivalents and Marketable Securities The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our Non-PEO NEOs, and our Cash, Cash Equivalents and Marketable Securities during the five most recently completed fiscal years. Tabular List of Most Important Financial Performance Measures The following table presents the financial performance measure that the Company considers to have been the most important in linking Compensation Actually Paid to our PEO and the Non-PEO NEOs for 2025 to Company performance.

  57. Pay Versus Performance

    | Cash, Cash Equivalents and Marketable Securities |