UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): December 9, 2025
IDEAYA Biosciences, Inc.
(Exact name of registrant as specified in its charter)
| Delaware | 001-38915 | 47-4268251 | ||
| (State or other jurisdiction of incorporation) | (Commission File Number) | (IRS Employer Identification Number) |
5000 Shoreline Court, Suite 300
South San Francisco, California 94080
(Address of principal executive offices, including Zip Code)
Registrant’s telephone number, including area code: (650) 443-6209
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
| ☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |
| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |
| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |
Securities registered pursuant to Section 12(b) of the Act:
| Title of each class | Trading | Name of each exchange on which registered | ||
| Common Stock, $0.0001 par value per share | IDYA | The Nasdaq Global Select Market |
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
| Item 1.02 | Termination of a Material Definitive Agreement. |
On December 9, 2025, GlaxoSmithKline Intellectual Property (No. 4) Limited (“GSK”) delivered written notice to IDEAYA Biosciences, Inc. (the “Company”) of its election to terminate the Collaboration, Option and License Agreement, dated June 15, 2020 (as amended, the “Agreement”). This written notice constituted GSK’s formal written follow-up to its December 4 communication to the Company regarding the termination, as referenced in the Company’s Form 8-K filed on December 5, 2025. Pursuant to the terms of the Agreement, such termination will be effective ninety (90) days following the date of GSK’s notice, which is March 9, 2026. During the ninety-day transition period, GSK will transfer the Werner Helicase (IDE275) and Pol Theta (IDE705) clinical programs to the Company in accordance with the applicable provisions of the Agreement. The Company will evaluate its strategic options for these two programs in 2026, and the update does not change its expectation of cash runway into 2030.
The Agreement is filed as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 12, 2020, Exhibit 10.18 to the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 18, 2022 and Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 10, 2022. For a summary of the material terms of the Agreement, please see Note 10, Significant Agreements, to Company’s financial statements for the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, filed with the Securities and Exchange Commission on February 18, 2025, which summary is incorporated by reference herein.
Forward-Looking Statements
Certain statements contained herein are forward-looking statements, including, but not limited to, statements related to the transfer of IDE275 and IDE705 clinical programs from GSK to the Company and the cash runway guidance. Such forward-looking statements involve substantial risks and uncertainties that could cause the Company’s preclinical and clinical development programs, future results, performance or achievements to differ significantly from those expressed or implied by the forward-looking statements. Such risks and uncertainties include, among others, the uncertainties inherent in the drug development process, including the Company’s programs’ early stage of development, the process of designing and conducting preclinical and clinical trials, the regulatory approval processes, the timing of regulatory filings, the challenges associated with manufacturing or commercialization of drug products, the outcome of pricing, coverage and reimbursement negotiations with third-party payors for the Company’s products, the Company’s ability to successfully establish, protect and defend its intellectual property, and other matters that could affect the sufficiency of existing cash to fund operations. The Company undertakes no obligation to update or revise any forward-looking statements. For a further description of the risks and uncertainties that could cause actual results to differ from those expressed in these forward-looking statements, as well as risks relating to the business of the Company in general, see the Company’s Annual Report on Form 10-K dated February 18, 2025 and any current and periodic reports filed or furnished with the Securities and Exchange Commission.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
| IDEAYA BIOSCIENCES, INC. | ||||||
| Date: December 12, 2025 | By: | /s/ Yujiro Hata | ||||
| Yujiro Hata | ||||||
| President and Chief Executive Officer | ||||||