Day One Biopharmaceuticals, Inc. (DAWN) - Insider Holders & Insider Ownership

List of insiders holdings for Day One Biopharmaceuticals, Inc.:
  1. Shares directly owned by the insider.
  2. Shares indirectly owned by the insider.
  3. Total shares owned by the insider (sum of shares directly and indirectly owned).
  4. Total market value if available.
  5. Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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#Insider Holder NameReport
Date Time		Shares Owned
Directly
Indirectly		Total
Shares Owned		Filing
1Grant Julie Papanek
Director		2023-03-03 17:48:330
2,880,761		2,880,761Form 4
2Canaan XI L.P.
Canaan Partners XI LLC
10% Owner		2022-11-02 16:15:552,548,403
0		2,548,403Form 13D
3Blackman Samuel C.
HEAD OF R&D		2024-12-12 16:06:231,034,015
1,000,000		2,034,015Form 4
4Atlas Venture Opportunity Fund I L.P.
10% Owner		2022-07-06 16:42:35991,396
0		991,396Form 4
5Becker Daniel J.
Director		2023-06-26 19:15:0237,500
0		37,500Form 4
6Gladstone Michael
Director		2024-05-28 18:17:4532,335
0		32,335Form 4
7Nicholson Garry A
Director		2026-04-23 16:30:490
0		0Form 4
8AI Day1 LLC
Access Industries Holdings LLC
ACCESS INDUSTRIES MANAGEMENT LLC
Blavatnik Len
10% Owner		2026-04-27 17:55:510
0		0Form 13D
9Bender Jeremy
CHIEF EXECUTIVE OFFICER		2026-04-23 16:40:560
0		0Form 4
10VASCONCELLES MICHAEL
Head of Research and Dev.		2026-04-23 16:39:500
0		0Form 4
11York Charles N II
COO and CFO		2026-04-23 16:39:050
0		0Form 4
12Dubow Adam
Gen Counsel & Secretary		2026-04-23 16:38:150
0		0Form 4
13Holles Natalie C.
Director		2026-04-23 16:37:250
0		0Form 4
14Ramasastry Saira
Director		2026-04-23 16:36:330
0		0Form 4
15Josey John A.
Director		2026-04-23 16:35:390
0		0Form 4
16Garland J. Scott
Director		2026-04-23 16:34:330
0		0Form 4
17Dable Habib J
Director		2026-04-23 16:33:160
0		0Form 4
18Grossman William
Director		2026-04-23 16:31:530
0		0Form 4
19Atlas Venture Fund XI L.P.
Atlas Venture Opportunity Fund I L.P.
ATLAS VENTURE ASSOCIATES X L.P.
Atlas Venture Associates X LLC
Atlas Venture Associates Opportunity I LLC
Atlas Venture Associates Opportunity I L.P.
10% Owner		2026-05-14 16:19:510
0		0Form 13G
20Merendino Lauren
Chief Commercial Officer		2026-04-23 16:30:000
0		0Form 4
21Atlas Venture Fund XI L.P.
10% Owner		2026-05-14 16:19:510
0		0Form 13G
22Atlas Venture Opportunity Fund II L.P.
Atlas Venture Fund XI L.P.
Atlas Venture Associates XI L.P.
Atlas Venture Associates XI LLC
Atlas Venture Opportunity Fund I L.P.
Atlas Venture Associates Opportunity I L.P.
Atlas Venture Associates Opportunity I LLC
10% Owner		2026-05-14 16:19:510
0		0Form 13G
23TAKEDA PHARMACEUTICAL CO LTD
Takeda Pharmaceuticals U.S.A. Inc.
MILLENNIUM PHARMACEUTICALS INC
Takeda Ventures Inc.
10% Owner		2023-02-03 17:06:040
0		0Form 13G