12 insiders reported 127 Form 4 transactions for Day One Biopharmaceuticals, Inc. (DAWN) over the past 18 months (most recent 2026-04-27). Recent activity: Blavatnik Len (Insider) Sell 12.9M shares, Access Industries Holdings LLC (Insider) Sell 12.9M shares, ACCESS INDUSTRIES MANAGEMENT, LLC (Insider) Sell 12.9M shares, AI Day1 LLC (Insider) Sell 12.9M shares, Bender Jeremy (CHIEF EXECUTIVE OFFICER) Sell 147,702 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-27 | Blavatnik Len | Insider | Sell | 12.9M | $278.0M |
| 2026-04-27 | Access Industries Holdings LLC | Insider | Sell | 12.9M | $278.0M |
| 2026-04-27 | ACCESS INDUSTRIES MANAGEMENT, LLC | Insider | Sell | 12.9M | $278.0M |
| 2026-04-27 | AI Day1 LLC | Insider | Sell | 12.9M | $278.0M |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 147,702 | $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 | VASCONCELLES MICHAEL | Head of Research and Dev. | Sell | 4,397 | $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 | 20,204 | $0 |
| 2026-04-23 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Sell | 300,000 | $0 |
| 2026-04-23 | Ramasastry Saira | Director | Sell | 40,485 | $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 |
| 2026-02-18 | 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 |
| 2026-02-18 | Bender Jeremy | CHIEF EXECUTIVE OFFICER | Buy | 4,750 | $0 |
Source: SEC Form 4 filings · as of 2026-04-27