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
AI Day1 LLC
Access Industries Holdings LLC
ACCESS INDUSTRIES MANAGEMENT LLC
Blavatnik Len
10% Owner		2022-06-21 16:44:3410,684,638
0		10,684,638Form 13D
Atlas 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		2023-02-14 16:23:146,008,534
0		6,008,534Form 13G
Atlas Venture Fund XI L.P.
10% Owner		2023-02-14 16:23:146,008,534
0		6,008,534Form 13G
Atlas 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		2023-02-14 16:23:146,008,534
0		6,008,534Form 13G
Grant Julie Papanek
Director		2023-03-03 17:48:330
2,880,761		2,880,761Form 4
Canaan XI L.P.
Canaan Partners XI LLC
10% Owner		2022-11-02 16:15:552,548,403
0		2,548,403Form 13D
Blackman Samuel C.
Chief Medical Officer		2023-03-14 18:19:331,233,660
1,000,000		2,233,660Form 4
Bender Jeremy
Chief Executive Officer		2023-03-08 17:50:221,174,276
563,148		1,737,424Form 4
Atlas Venture Opportunity Fund I L.P.
10% Owner		2022-07-06 16:42:35991,396
0		991,396Form 4
York Charles N II
COO, CFO and Secretary		2023-02-21 17:01:53262,128
0		262,128Form 4
Nicholson Garry A
Director		2022-09-14 19:34:0033,900
0		33,900Form 4
Gladstone Michael
Director		2022-06-23 20:27:5328,700
0		28,700Form 4
Ramasastry Saira
Director		2022-06-23 18:12:5928,700
0		28,700Form 4
Josey John A.
Director		2022-06-23 18:11:5428,700
0		28,700Form 4
Holles Natalie C.
Director		2022-06-23 18:11:0428,700
0		28,700Form 4
Garland J. Scott
Director		2022-06-23 18:09:1328,700
0		28,700Form 4
Becker Daniel J.
Director		2022-06-23 18:08:3628,700
0		28,700Form 4
TAKEDA 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