Company: DAWN
Filing Date: 2025-04-11
Form Type: DEF 14A
Source: 0001140361-25-013462
Chunk: 1

Company: Day One Biopharmaceuticals, Inc.
Filing Date: 2025-04-11
Form: DEF 14A
Chunk 1
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 which are more fully described in the accompanying proxy statement:

| 1. | To elect two Class I directors, each to serve three-year terms through the third annual meeting of stockholders following this meeting and until a successor has been elected and qualified or until earlier resignation or removal. |

| 3. | To approve on a non-binding advisory basis, the compensation of our named executive officers. |

In addition, stockholders may be asked to consider and vote upon such other business as may properly come before the meeting or any adjournment, rescheduling or postponement thereof. Only stockholders of record at the close of business on April 7, 2025 are entitled to receive notice of, and to vote at the meeting and any adjournments thereof. The 2025 Annual Meeting materials include this Notice of Internet Availability of Proxy Materials (“Notice”), the accompanying proxy statement and our Annual Report to stockholders, each of which has been furnished to you over the Internet or, if you have requested a paper copy of the materials, by mail. For at least ten days prior to the meeting, a complete list of the stockholders entitled to vote at the meeting will be available upon request by any stockholder for any purpose relating to the meeting. Stockholders can request the list on our website located at https://ir.dayonebio.com under “Contact IR” in the “Investor Resources” section. Your vote as a Day One Biopharmaceuticals, Inc. stockholder is very important. Each share of common stock that you own represents one vote.

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For questions regarding your stock ownership, you may contact us through our website located at https://ir.dayonebio.com under “Contact IR” in the “Investor Resources” section or, if you are a registered holder, our transfer agent, Equiniti Trust Company, LLC, by email through their website at https://equiniti.com/us/ast-access/individuals and select GET HELP or by phone at (800) 937-5449 or (718) 921-8124. Whether or not you expect to attend the virtual meeting, we encourage you to read the proxy statement and vote through the Internet or by telephone, or to request, sign and return your proxy card as soon as possible, so that your shares may be represented at the meeting. For specific instructions on how to vote your shares, please refer to the section entitled “General Proxy Information” in the proxy statement.

| By Order of the Board of Directors,