List of insiders holdings for Day One Biopharmaceuticals Inc.:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- 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
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | AI Day1 LLC Access Industries Holdings LLC ACCESS INDUSTRIES MANAGEMENT LLC Blavatnik Len 10% Owner | 2024-08-05 17:05:27 | 12,929,322 0 | 12,929,322 | Form 13D |
| 2 | 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 | 2024-11-14 16:30:11 | 4,869,681 0 | 4,869,681 | Form 13G |
| 3 | 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 | 2024-11-14 16:30:11 | 4,869,681 0 | 4,869,681 | Form 13G |
| 4 | Atlas Venture Fund XI L.P. 10% Owner | 2024-11-14 16:30:11 | 4,869,681 0 | 4,869,681 | Form 13G |
| 5 | Grant Julie Papanek Director | 2023-03-03 17:48:33 | 0 2,880,761 | 2,880,761 | Form 4 |
| 6 | Canaan XI L.P. Canaan Partners XI LLC 10% Owner | 2022-11-02 16:15:55 | 2,548,403 0 | 2,548,403 | Form 13D |
| 7 | Bender Jeremy CHIEF EXECUTIVE OFFICER | 2025-05-19 17:44:25 | 461,873 1,608,838 | 2,070,711 | Form 4 |
| 8 | Blackman Samuel C. HEAD OF R&D | 2024-12-12 16:06:23 | 1,034,015 1,000,000 | 2,034,015 | Form 4 |
| 9 | Atlas Venture Opportunity Fund I L.P. 10% Owner | 2022-07-06 16:42:35 | 991,396 0 | 991,396 | Form 4 |
| 10 | VASCONCELLES MICHAEL Head of Research and Dev. | 2025-06-18 19:42:38 | 572,000 0 | 572,000 | Form 4 |
| 11 | York Charles N II COO, CFO AND SECRETARY | 2025-05-19 17:45:58 | 440,481 0 | 440,481 | Form 4 |
| 12 | Dubow Adam GENERAL COUNSEL | 2025-05-19 17:48:04 | 163,918 0 | 163,918 | Form 4 |
| 13 | Merendino Lauren Chief Commercial Officer | 2025-05-19 17:54:37 | 152,129 0 | 152,129 | Form 4 |
| 14 | Becker Daniel J. Director | 2023-06-26 19:15:02 | 37,500 0 | 37,500 | Form 4 |
| 15 | Josey John A. Director | 2025-06-04 17:47:00 | 37,500 0 | 37,500 | Form 4 |
| 16 | Holles Natalie C. Director | 2025-06-04 17:47:51 | 37,500 0 | 37,500 | Form 4 |
| 17 | Nicholson Garry A Director | 2025-06-04 17:49:02 | 37,500 0 | 37,500 | Form 4 |
| 18 | Garland J. Scott Director | 2025-06-04 17:50:29 | 37,500 0 | 37,500 | Form 4 |
| 19 | Ramasastry Saira Director | 2025-06-04 17:51:53 | 37,500 0 | 37,500 | Form 4 |
| 20 | Dable Habib J Director | 2025-06-04 17:53:04 | 37,500 0 | 37,500 | Form 4 |
| 21 | Grossman William Director | 2025-06-04 17:54:17 | 37,500 0 | 37,500 | Form 4 |
| 22 | Gladstone Michael Director | 2024-05-28 18:17:45 | 32,335 0 | 32,335 | Form 4 |
| 23 | TAKEDA PHARMACEUTICAL CO LTD Takeda Pharmaceuticals U.S.A. Inc. MILLENNIUM PHARMACEUTICALS INC Takeda Ventures Inc. 10% Owner | 2023-02-03 17:06:04 | 0 0 | 0 | Form 13G |