🕵️ Prime Medicine, Inc. ($PRME)
SEC insider & ownership activity, last 12 months · CIK 1894562 · every row links its SEC filing
Over the last 12 months insiders bought $34.9M with no open-market selling against it. Nelsen Robert bought $10.0M in discretionary trades (Aug). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
4 buyers, $34.9M (4 lots) · 0 sellers, $0 (0 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Nelsen Robert | 1 | $10.0M | 0 | – | Aug 1, 2025 |
| ARCH Venture Partners XII, LLC | 1 | $10.0M | 0 | – | Aug 1, 2025 |
| ARCH Venture Partners X, LLC | 1 | $10.0M | 0 | – | Aug 1, 2025 |
| GV 2021 GP, L.L.C. | 1 | $5.0M | 0 | – | Aug 1, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Alphabet Holdings LLC | 12.3% | 13G | Nov 12, 2025 | filing ↗ | |
| XXVI Holdings Inc. | 12.3% | 13G | Nov 12, 2025 | filing ↗ | |
| Alphabet Inc. | 12.3% | 13G | Nov 12, 2025 | filing ↗ | |
| Keith Crandell | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| Kristina Burow | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| Robert Nelsen | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| Steven Gillis | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| ARCH Venture Partners XII, LLC | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| ARCH Venture Fund XII, L.P. | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| ARCH Venture Partners XII, L.P. | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| ARCH Venture Fund X, L.P. | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| ARCH Venture Fund X Overage, L.P. | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| ARCH Venture Partners X, L.P. | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| ARCH Venture Partners X Overage, L.P. | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| ARCH Venture Partners X, LLC | 10.4% | 13D | Aug 7, 2025 | filing ↗ | |
| GV 2019, L.P. | 7.5% | 13G | Nov 12, 2025 | filing ↗ | |
| GV 2019 GP, L.P. | 7.5% | 13G | Nov 12, 2025 | filing ↗ | |
| GV 2019 GP, L.L.C. | 7.5% | 13G | Nov 12, 2025 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Other events (8.01) | Jul 6, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 5, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Officer/director changes (5.02) | Apr 7, 2026 | filing ↗ |
| Earnings (2.02) | Mar 3, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Mar 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 3, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 12, 2026 | filing ↗ |
| Earnings (2.02) | Nov 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 7, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Sep 8, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 8, 2025 | filing ↗ |
| Earnings (2.02) | Aug 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 7, 2025 | filing ↗ |
| Officer/director changes (5.02) | Aug 1, 2025 | filing ↗ |
| Shareholder vote (5.07) | Aug 1, 2025 | filing ↗ |
| Material agreement (1.01) | Jul 30, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 30, 2025 | filing ↗ |
| Earnings (2.02) | Jul 30, 2025 | filing ↗ |
| Other events (8.01) | Jul 30, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 30, 2025 | filing ↗ |