Insider Transactions Reported by 22 Insiders of Day One Biopharmaceuticals, Inc.

Symbol
DAWN on Nasdaq
Location
Brisbane, CA

Insiders trading volume in the past year

Day One Biopharmaceuticals, Inc. executives and other stock owners filed with the SEC include:

Name Relationship Holdings Value Past Year Net Change Change % Report Date
AI Day1 LLC 10%+ Owner $163,143,688 01 Aug 2024
Canaan XI L.P. 10%+ Owner $81,412,679 21 Sep 2022
TAKEDA PHARMACEUTICAL CO LTD 10%+ Owner $71,544,250 07 Dec 2021
Atlas Venture Fund XI, L.P. 10%+ Owner $70,239,762 12 Dec 2022
Samuel C. Blackman Head Of R&D $29,401,148 10 Dec 2024
Atlas Venture Opportunity Fund II, L.P. 10%+ Owner $20,551,756 17 Jun 2022
Jeremy Bender CHIEF EXECUTIVE OFFICER, Director $10,494,060 -$517,080 -4.7% 15 Feb 2026
Atlas Venture Opportunity Fund I, L.P. 10%+ Owner $9,271,526 01 Jul 2022
Charles N. York II COO and CFO $6,219,591 -$161,153 -2.5% 15 Feb 2026
Julie Papanek Grant Director $3,857,700 01 Mar 2023
Adam Dubow Gen Counsel & Secretary $2,290,391 -$170,715 -6.9% 15 Feb 2026
Lauren Merendino Chief Commercial Officer $697,875 -$150,723 -18% 15 Feb 2026
Michael Vasconcelles Head of Research and Dev. $51,009 -$31,647 -38% 15 Feb 2026
Michael Gladstone Director 23 May 2024
Daniel J. Becker Director 22 Jun 2023
J. Scott Garland Director 06 Nov 2025
Garry A. Nicholson Director 06 Nov 2025
Habib J. Dable Director 06 Nov 2025
Saira Ramasastry Director 06 Nov 2025
Natalie C. Holles Director 06 Nov 2025
William Grossman Director 06 Nov 2025
John A. Josey Director 06 Nov 2025

Recent Insider Transactions by Companies or Individuals for Day One Biopharmaceuticals, Inc.

Insider Symbol Class Transaction % Value $ * Price $ Shares Shares Owned Date Ownership
Lauren Merendino DAWN Common Stock Sale -8.81% $67,448 $11.60 -5,814 60,157 17 Feb 2026 Direct
Adam Dubow DAWN Common Stock Sale -8.09% $74,188 $11.60 -6,395 72,694 17 Feb 2026 Direct
Charles N. York II DAWN Common Stock Sale -1.91% $70,359 $11.60 -6,065 312,025 17 Feb 2026 Direct
Jeremy Bender DAWN Common Stock Sale -7.02% $179,338 $11.60 -15,459 204,603 17 Feb 2026 Direct
Michael Vasconcelles DAWN Common Stock Sale -38.3% $31,647 $11.60 -2,728 4,397 17 Feb 2026 Direct
Lauren Merendino DAWN Common Stock Options Exercise 29.8% 15,162 65,971 15 Feb 2026 Direct
Lauren Merendino DAWN Restricted Stock Units (RSU) Options Exercise -6.25% -4,625 69,375 15 Feb 2026 Direct
Lauren Merendino DAWN Restricted Stock Unit (RSU) Options Exercise -35.7% -10,537 18,978 15 Feb 2026 Direct
Adam Dubow DAWN Common Stock Options Exercise 26.3% 16,463 79,089 15 Feb 2026 Direct
Adam Dubow DAWN Restricted Stock Unit (RSU) Options Exercise -75.8% -16,463 5,250 15 Feb 2026 Direct
Charles N. York II DAWN Common Stock Options Exercise 7.93% 23,375 318,090 15 Feb 2026 Direct
Charles N. York II DAWN Restricted Stock Unit (RSU) Options Exercise -77.6% -23,375 6,750 15 Feb 2026 Direct
Jeremy Bender DAWN Common Stock Options Exercise 24.2% 42,937 220,102 15 Feb 2026 Direct
Jeremy Bender DAWN Restricted Stock Unit (RSU) Options Exercise -75.1% -42,937 14,250 15 Feb 2026 Direct
Michael Vasconcelles DAWN Common Stock Options Exercise 7,125 7,125 15 Feb 2026 Direct
Michael Vasconcelles DAWN Restricted Stock Unit (RSU) Options Exercise -6.25% -7,125 106,875 15 Feb 2026 Direct
Jeremy Bender DAWN Restricted Stock Units Award 237,000 237,000 30 Jan 2026 Direct
Jeremy Bender DAWN Stock Option (right to buy Common Stock) Award 355,000 355,000 30 Jan 2026 Direct
Lauren Merendino DAWN Restricted Stock Units Award 74,000 74,000 30 Jan 2026 Direct
Lauren Merendino DAWN Stock Option (right to buy Common Stock) Award 110,000 110,000 30 Jan 2026 Direct
Adam Dubow DAWN Restricted Stock Units Award 70,000 70,000 30 Jan 2026 Direct
Adam Dubow DAWN Stock Option (right to buy Common Stock) Award 105,000 105,000 30 Jan 2026 Direct
Michael Vasconcelles DAWN Restricted Stock Units Award 114,000 114,000 30 Jan 2026 Direct
Michael Vasconcelles DAWN Stock Option (right to buy Common Stock) Award 171,000 171,000 30 Jan 2026 Direct
Charles N. York II DAWN Restricted Stock Units Award 126,000 126,000 30 Jan 2026 Direct
Charles N. York II DAWN Stock Option (right to buy Common Stock) Award 188,000 188,000 30 Jan 2026 Direct
Jeremy Bender DAWN Common Stock Gift -100% -14,450 0 25 Nov 2025 See footnote
Jeremy Bender DAWN Common Stock Gift 600,000 300,000 25 Nov 2025 See footnote
Jeremy Bender DAWN Common Stock Gift -42.6% -600,000 808,285 25 Nov 2025 By Bender Revocable Trust
Adam Dubow DAWN Common Stock Sale -6.45% $38,503 $8.91 -4,319 62,626 17 Nov 2025 Direct
Charles N. York II DAWN Common Stock Sale -1.36% $36,212 $8.91 -4,062 294,715 17 Nov 2025 Direct
Lauren Merendino DAWN Common Stock Sale -6.83% $33,216 $8.91 -3,726 50,809 17 Nov 2025 Direct
Jeremy Bender DAWN Common Stock Sale -8.23% $141,690 $8.91 -15,894 177,165 17 Nov 2025 Direct
Adam Dubow DAWN Common Stock Options Exercise 22% 12,087 66,945 15 Nov 2025 Direct
Adam Dubow DAWN Restricted Stock Unit (RSU) Options Exercise -63.3% -12,087 7,000 15 Nov 2025 Direct
Charles N. York II DAWN Common Stock Options Exercise 5.99% 16,875 298,777 15 Nov 2025 Direct
Charles N. York II DAWN Restricted Stock Unit (RSU) Options Exercise -100% -16,875 0 15 Nov 2025 Direct
Lauren Merendino DAWN Common Stock Options Exercise 24% 10,536 54,535 15 Nov 2025 Direct
Lauren Merendino DAWN Restricted Stock Unit (RSU) Options Exercise -32.2% -10,536 22,140 15 Nov 2025 Direct
Jeremy Bender DAWN Common Stock Options Exercise 19.6% 31,694 193,059 15 Nov 2025 Direct
Jeremy Bender DAWN Restricted Stock Unit (RSU) Options Exercise -100% -31,694 0 15 Nov 2025 Direct
Jeremy Bender DAWN Stock Option (right to buy Common Stock) Award 2,676,134 1,463,134 06 Nov 2025 Direct
Jeremy Bender DAWN Stock Option (right to buy Common Stock) Disposed to Issuer -100% -2,676,134 0 06 Nov 2025 Direct
Lauren Merendino DAWN Stock Option (right to buy Common Stock) Award 510,200 330,200 06 Nov 2025 Direct
Lauren Merendino DAWN Stock Option (right to buy Common Stock) Disposed to Issuer -100% -510,200 0 06 Nov 2025 Direct
John A. Josey DAWN Stock Option (right to buy Common Stock) Award 162,716 63,000 06 Nov 2025 Direct
John A. Josey DAWN Stock Option (right to buy Common Stock) Disposed to Issuer -100% -162,716 0 06 Nov 2025 Direct
Adam Dubow DAWN Stock Option (right to buy Common Stock) Disposed to Issuer -100% -270,000 0 06 Nov 2025 Direct
Adam Dubow DAWN Stock Option (right to buy Common Stock) Award 579,000 309,000 06 Nov 2025 Direct
William Grossman DAWN Stock Option (right to buy Common Stock) Award 98,995 66,660 06 Nov 2025 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.