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Day One Biopharmaceuticals, Inc. 3 SEC Filings

Filed On Filing
18 Jun 2025 Form 3: Vasconcelles Michael, Head of Research and Dev.

No securities owned

28 Feb 2025 Form 3: Merendino Lauren, Chief Commercial Officer

Holds 28,552 shares of Common Stock

19 Jan 2024 Form 3: Grossman William, Director

No securities owned

19 Jan 2024 Form 3: Dable Habib J, Director

No securities owned

16 Nov 2023 Form 3: Dubow Adam, General Counsel

Holds 3,141 shares of Common Stock

14 Sep 2022 Form 3: Nicholson Garry A, Director

Holds 0 shares of No securities beneficially owned.

18 Aug 2021 Form 3: Garland J. Scott, Director

Holds 0 shares of No securities beneficially owned.

26 May 2021 Form 3: Atlas Venture Fund XI, L.p., 10% owner and 5 others
26 May 2021 Form 3: Grant Papanek Julie, Chair of the Board

Holds 465,000 shares of Common Stock

26 May 2021 Form 3: Ramasastry Saira, Director

Holds 50,485 shares of Common Stock

26 May 2021 Form 3: Josey John A., Director

Holds 65,292 shares of Common Stock

26 May 2021 Form 3: Holles Natalie C., Director

Holds 57,310 shares of Common Stock

26 May 2021 Form 3: Gladstone Michael, Director
26 May 2021 Form 3: Becker Daniel J., Director
26 May 2021 Form 3: Blackman Samuel C., Chief Medical Officer

Holds 2,386,718 shares of Common Stock

26 May 2021 Form 3: York Charles N Ii, COO, CFO and Secretary

Holds 337,560 shares of Common Stock

26 May 2021 Form 3: Bender Jeremy, Director

Holds 1,828,838 shares of Common Stock

26 May 2021 Form 3: Takeda Pharmaceutical Co Ltd, 10% owner and 1 other

Holds 6,470,382 shares of Common Stock

26 May 2021 Form 3: Canaan Xi L.p., 10% owner and 1 other

Holds 3,245,869 shares of Common Stock

26 May 2021 Form 3: Ai Day 1 Llc, 10% owner and 3 others

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