🕵️ Assembly Biosciences, Inc. ($ASMB)
SEC insider & ownership activity, last 12 months · CIK 1426800 · every row links its SEC filing
Over the last 12 months insiders sold $15K with no open-market buying against it. Jeanette M. Bjorkquist sold $9K in discretionary trades (Mar–Jun). Gilead Sciences, Inc. trimmed 29.0% → 25.1%. No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 2 sellers, $15K (5 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Jeanette M. Bjorkquist | 0 | – | 3 | $9K | Jun 17, 2026 |
| Nicole S. White | 0 | – | 2 | $5K | Mar 30, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Gilead Sciences, Inc. | 29.9% | 13D | Dec 19, 2024 | filing ↗ | |
| Gilead Sciences, Inc. | 25.1% | 13D | May 22, 2026 | filing ↗ | |
| Alexander Schornstein | 10.0% | 13G | Dec 23, 2024 | filing ↗ | |
| Commodore Capital LP | 9.9% | 13G | Aug 15, 2025 | filing ↗ | |
| Commodore Capital Master LP | 9.9% | 13G | Aug 15, 2025 | filing ↗ | |
| Robert Egen Atkinson | 9.9% | 13G | Aug 15, 2025 | filing ↗ | |
| Michael Kramarz | 9.9% | 13G | Aug 15, 2025 | filing ↗ | |
| RA Capital Management, L.P. | 9.5% | 13G | Aug 18, 2025 | filing ↗ | |
| Peter Kolchinsky | 9.5% | 13G | Aug 18, 2025 | filing ↗ | |
| Rajeev Shah | 9.5% | 13G | Aug 18, 2025 | filing ↗ | |
| RA Capital Healthcare Fund, L.P. | 9.5% | 13G | Aug 18, 2025 | filing ↗ | |
| Farallon Capital Management, L.L.C. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Joshua J. Dapice | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Dreyfuss, Philip D. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Hannah E. Dunn | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Gehani, Varun N. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Giauque, Nicolas | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Husen, Avner A. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| KIM, David T. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| LINN, Michael G. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| LUO Patrick (CHENG) | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Roberts, JR., Thomas G. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Edric C. Saito | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Daniel S. Short | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Spokes, Andrew J. M. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Warren, JOHN R. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Wehrly, MARK C. | 8.1% | 13G | Aug 4, 2026 | filing ↗ | |
| Paradigm BioCapital Advisors LP | 7.8% | 13G | Aug 14, 2026 | filing ↗ | |
| Paradigm BioCapital Advisors GP LLC | 7.8% | 13G | Aug 14, 2026 | filing ↗ | |
| Senai Asefaw, M.D. | 7.8% | 13G | Aug 14, 2026 | filing ↗ | |
| Janus Henderson Group Ltd. | 6.9% | 13G | Aug 13, 2026 | filing ↗ | |
| Paradigm BioCapital International Fund Ltd. | 6.9% | 13G | Aug 14, 2026 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 13, 2026 | filing ↗ |
| Acquisition or disposition (2.01) | Aug 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 13, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 4, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 4, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 22, 2026 | filing ↗ |
| Other events (8.01) | May 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 22, 2026 | filing ↗ |
| Material agreement (1.01) | May 21, 2026 | filing ↗ |
| Other events (8.01) | May 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 21, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Officer/director changes (5.02) | Mar 24, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 24, 2026 | filing ↗ |
| Earnings (2.02) | Mar 19, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 19, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 8, 2025 | filing ↗ |
| Other events (8.01) | Dec 8, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 8, 2025 | filing ↗ |
| Earnings (2.02) | Nov 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 10, 2025 | filing ↗ |