Day One Biopharmaceuticals, Inc.

Ownership Transactions Reported by 20 Insiders

	Insiders	Shares	%	Avg Price	Total $
Buys	1	+828K	64.8%	$14.50	+$12M
Sells	5	-449K	35.2%	$15.75	-$7.07M
Net	-4	+379K	29.7%		+$4.93M

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Report Date
AI Day1 LLC	10%+ Owner	$163M	+$12M	+7.94%	Aug 1, 2024
Canaan XI L.P.	10%+ Owner	$81.4M			Sep 21, 2022
Takeda Pharmaceutical Co Ltd	10%+ Owner	$71.5M			Dec 7, 2021
Atlas Venture Fund XI, L.P.	10%+ Owner	$70.2M			Dec 12, 2022
Samuel C. Blackman	Head Of R&D	$29.4M	-$3.56M	-10.8%	Dec 10, 2024
Atlas Venture Opportunity Fund II, L.P.	10%+ Owner	$20.6M			Jun 17, 2022
Jeremy Bender	CHIEF EXECUTIVE OFFICER, Director	$16.6M	-$1.95M	-10.5%	Nov 15, 2024
Atlas Venture Opportunity Fund I, L.P.	10%+ Owner	$9.27M			Jul 1, 2022
Charles N. York II	Coo, Cfo And Secretary	$5.94M	-$1.24M	-17.2%	Nov 15, 2024
Julie Papanek Grant	Director	$3.86M			Mar 1, 2023
Adam Dubow	General Counsel	$1.85M	-$188K	-9.22%	Nov 15, 2024
Saira Ramasastry	Director	$534K	-$132K	-19.8%	Jun 21, 2024
John A. Josey	Director				May 23, 2024
William Grossman	Director				May 23, 2024
Natalie C. Holles	Director				May 23, 2024
J. Scott Garland	Director				May 23, 2024
Garry A. Nicholson	Director				May 23, 2024
Daniel J. Becker	Director				Jun 22, 2023
Michael Gladstone	Director				May 23, 2024
Habib J. Dable	Director				May 23, 2024

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership

* An asterisk sign (*) next to the price indicates that the price is likely invalid.