12 insiders reported 112 Form 4 transactions for Day One Biopharmaceuticals, Inc. (DAWN) over the past 18 months (most recent 2026-04-27). Recent activity: Blavatnik Len (10% Owner) Sell 12.9M shares, Access Industries Holdings LLC (10% Owner) Sell 12.9M shares, ACCESS INDUSTRIES MANAGEMENT, LLC (10% Owner) Sell 12.9M shares, AI Day1 LLC (10% Owner) Sell 12.9M shares, Bender Jeremy (CHIEF EXECUTIVE OFFICER) Sell 20,204 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-27 | Blavatnik Len | 10% Owner | Sell | 12.9M | $278.0M |
| 2026-04-27 | Access Industries Holdings LLC | 10% Owner | Sell | 12.9M | $278.0M |
| 2026-04-27 | ACCESS INDUSTRIES MANAGEMENT, LLC | 10% Owner | Sell | 12.9M | $278.0M |
| 2026-04-27 | AI Day1 LLC | 10% Owner | Sell | 12.9M | $278.0M |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 20,204 | $0 |
| 2026-04-23 | Holles Natalie C. | Director | Sell | 57,310 | $0 |
| 2026-04-23 | York Charles N II | COO and CFO | Sell | 312,025 | $0 |
| 2026-04-23 | Ramasastry Saira | Director | Sell | 40,485 | $0 |
| 2026-04-23 | Dubow Adam | Gen Counsel & Secretary | Sell | 72,694 | $0 |
| 2026-04-23 | Josey John A. | Director | Sell | 72,292 | $0 |
| 2026-04-23 | Merendino Lauren | Chief Commercial Officer | Sell | 60,157 | $0 |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 204,643 | $0 |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 300,000 | $0 |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 147,702 | $0 |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 18,197 | $0 |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 300,000 | $0 |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 808,285 | $0 |
| 2026-04-23 | VASCONCELLES MICHAEL | Head of Research and Dev. | Sell | 4,397 | $0 |
| 2026-02-18 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Buy | 4,750 | $0 |
| 2026-02-18 | Dubow Adam | Gen Counsel & Secretary | Buy | 2,963 | $0 |
| 2026-02-18 | Dubow Adam | Gen Counsel & Secretary | Buy | 1,750 | $0 |
| 2026-02-18 | Dubow Adam | Gen Counsel & Secretary | Buy | 3,688 | $0 |
| 2026-02-18 | Dubow Adam | Gen Counsel & Secretary | Buy | 3,687 | $0 |
| 2026-02-18 | Dubow Adam | Gen Counsel & Secretary | Buy | 4,375 | $0 |
| 2026-02-18 | Dubow Adam | Gen Counsel & Secretary | Sell | 6,395 | $74,182 |
Source: SEC Form 4 filings · as of 2026-04-27