Company: DAWN
Filing Date: 2025-04-11
Form Type: DEF 14A
Source: 0001140361-25-013462
Chunk: 5

Company: Day One Biopharmaceuticals, Inc.
Filing Date: 2025-04-11
Form: DEF 14A
Chunk 5
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 Meeting with respect to the proposals described in this Proxy Statement. This Proxy Statement includes information that we are required to provide to you pursuant to the rules and regulations of the SEC and is designed to assist you in voting your shares. We intend to ensure that our stockholders are afforded the same rights and opportunities to participate virtually as they would at an in-person meeting. We believe the virtual format improves access for stockholders to attend and participate fully and equally in the Annual Meeting because they can join with any Internet-connected device from any location around the world at no cost. Our virtual meeting format helps us engage with all stockholders regardless of size, resources, or physical location, saves us and stockholders time and money, and reduces our environmental impact. Record Date; Quorum Only holders of record of our common stock at the close of business on April 7, 2025 (the “Record Date”) will be entitled to vote at the Annual Meeting. At the close of business on the Record Date, we had 101,353,781 shares of common stock outstanding and entitled to vote. At the close of business on the Record Date, our directors and executive officers and their respective affiliates beneficially owned and were entitled to vote 2,227,732 shares of common stock at the Annual Meeting, or approximately 2.2% of the voting power of the shares of our common stock outstanding on such date. For at least ten days prior to the Annual Meeting, a complete list of the stockholders entitled to vote at the Annual Meeting will be available for examination by any stockholder for any purpose relating to the Annual Meeting. Stockholders can request the list of stockholders through our website located at https://ir.dayonebio.com under “Contact IR” in the “Investor Resources” section. The holders of a majority of the voting power of the shares of our common stock entitled to vote at the Annual Meeting as of the Record Date must be present at the Annual Meeting in order to hold the Annual Meeting and conduct business. This presence is called a quorum. Your shares are counted as present at the Annual Meeting if you are present and vote at the Annual Meeting or if you have properly submitted a proxy. 7

TABLE OF CONTENTS

Participating in the Annual Meeting

| • | Instructions on how to attend the Annual Meeting are posted at www.virtualshareholdermeeting.com/DAWN2025. |

| • | You will need the 16-digit control number provided in your proxy materials to attend the Annual Meeting at www.virtual