Company: DAWN
Filing Date: 2025-04-11
Form Type: DEF 14A
Source: 0001140361-25-013462
Chunk: 0

Company: Day One Biopharmaceuticals, Inc.
Filing Date: 2025-04-11
Form: DEF 14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |

| ☒ | Definitive Proxy Statement |

| ☐ | Definitive Additional Materials |

| ☐ | Soliciting Material under §240.14a-12 |

DAY ONE BIOPHARMACEUTICALS, INC. (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check all boxes that apply):

| ☒ | No fee required. |

| ☐ | Fee paid previously with preliminary materials. |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |

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Day One Biopharmaceuticals, Inc. 1800 Sierra Point Parkway, Suite 200 Brisbane, CA 94005 NOTICE OF ANNUAL MEETING OF STOCKHOLDERS April 11, 2025 To Our Stockholders: NOTICE IS HEREBY GIVEN that the 2025 Annual Meeting of Stockholders of Day One Biopharmaceuticals, Inc. (the “Company,” “Day One,” “we,” or “us”) will be held via a virtual meeting. You will be able to participate in the 2025 Annual Meeting and vote during the 2025 Annual Meeting via live webcast by visiting www.virtualshareholdermeeting.com/DAWN2025 on Monday, June 2, 2025 at 10:00 a.m. Pacific Time. It is important that you retain a copy of the control number found on the proxy card or voting instruction form, as such number will be required in order for stockholders to gain access to the virtual meeting. We believe that hosting a “virtual meeting” will enable greater stockholder attendance and participation from any location around the world, while also lowering costs and reducing environmental impact. We are holding the meeting for the following purposes,