Company: DAWN
Filing Date: 2025-11-04
Form Type: 10-Q
Source: 0001193125-25-264649
Chunk: 126

Company: Day One Biopharmaceuticals, Inc.
Filing Date: 2025-11-04
Form: 10-Q
Item: Item 3
Chunk 126
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   * This certification is deemed not filed for purposes of section 18 of the Exchange Act or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act.

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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 thereunto duly authorized.  

     DAY ONE BIOPHARMACEUTICALS, INC.

     Date: November 4, 2025
     By:
     /s/ Jeremy Bender, Ph.D., M.B.A.

     Jeremy Bender, Ph.D., M.B.A.

     Chief Executive Officer and PresidentPrincipal Executive Officer

     Date: November 4, 2025
     By:
     /s/ Charles N. York II, M.B.A.

     Charles N. York II, M.B.A.

     Chief Operating Officer and Chief Financial OfficerPrincipal Financial and Accounting Officer

100