🕵️ Sutro Biopharma, Inc. ($STRO)
SEC insider & ownership activity, last 12 months · CIK 1382101 · every row links its SEC filing
Over the last 12 months insiders bought $90K with no open-market selling against it. Matsui Connie bought $40K in discretionary trades (Oct). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
5 buyers, $90K (5 lots) · 0 sellers, $0 (0 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Matsui Connie | 1 | $40K | 0 | – | Oct 15, 2025 |
| Gregory K. Chow | 1 | $16K | 0 | – | Oct 15, 2025 |
| Gerber Hans-Peter | 1 | $14K | 0 | – | Oct 15, 2025 |
| Chung Jane | 1 | $10K | 0 | – | Oct 15, 2025 |
| Pauling David | 1 | $10K | 0 | – | Oct 15, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Affinity Healthcare Fund, LP | 7.8% | 13G | Oct 23, 2025 | filing ↗ | |
| Suvretta Capital Management, LLC | 7.7% | 13G | Aug 13, 2025 | filing ↗ | |
| Averill Master Fund, Ltd. | 7.7% | 13G | Aug 13, 2025 | filing ↗ | |
| Aaron Cowen | 7.7% | 13G | Aug 13, 2025 | filing ↗ | |
| BVF Partners L P/IL | 7.6% | 13G | Feb 18, 2026 | filing ↗ | |
| BVF INC/IL | 7.6% | 13G | Feb 18, 2026 | filing ↗ | |
| Mark N. Lampert | 7.6% | 13G | Feb 18, 2026 | filing ↗ | |
| BVF GP Holdings LLC | 7.0% | 13G | Feb 18, 2026 | filing ↗ | |
| Affinity Asset Advisors, LLC | 6.5% | 13G | May 14, 2026 | filing ↗ | |
| Michael Cho | 6.5% | 13G | May 14, 2026 | filing ↗ | |
| Srinivas Akkaraju | 6.4% | 13G | May 15, 2026 | filing ↗ | |
| POINT72 Asset Management, L.P. | 5.7% | 13G | May 1, 2026 | filing ↗ | |
| POINT72 Capital Advisors, Inc. | 5.7% | 13G | May 1, 2026 | filing ↗ | |
| Steven A. Cohen | 5.7% | 13G | May 1, 2026 | filing ↗ | |
| Perceptive Advisors LLC | 5.4% | 13G | Apr 21, 2026 | filing ↗ | |
| Joseph Edelman | 5.4% | 13G | Apr 21, 2026 | filing ↗ | |
| Perceptive Life Sciences Master Fund, Ltd. | 5.4% | 13G | Apr 21, 2026 | filing ↗ | |
| Kynam Capital Management, LP | 5.3% | 13G | May 15, 2026 | filing ↗ | |
| Kynam Capital Management GP, LLC | 5.3% | 13G | May 15, 2026 | filing ↗ | |
| Yue Tang | 5.3% | 13G | May 15, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Barbara Leyman | $131K | Jan 20, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Shareholder vote (5.07) | Jun 5, 2026 | filing ↗ |
| Earnings (2.02) | May 14, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 14, 2026 | filing ↗ |
| Agreement terminated (1.02) | Mar 23, 2026 | filing ↗ |
| Earnings (2.02) | Mar 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 23, 2026 | filing ↗ |
| Material agreement (1.01) | Feb 9, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 9, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 9, 2026 | filing ↗ |
| Other events (8.01) | Dec 17, 2025 | filing ↗ |
| Material Modifications to Rights of Security Holders (3.03) | Dec 1, 2025 | filing ↗ |
| Charter/bylaw changes (5.03) | Dec 1, 2025 | filing ↗ |
| Other events (8.01) | Dec 1, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 1, 2025 | filing ↗ |
| Earnings (2.02) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |
| Exit or disposal costs (2.05) | Sep 29, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 29, 2025 | filing ↗ |
| Earnings (2.02) | Aug 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 7, 2025 | filing ↗ |