🕵️ Fulcrum Therapeutics, Inc. ($FULC)
SEC insider & ownership activity, last 12 months · CIK 1680581 · every row links its SEC filing
Over the last 12 months insiders sold $59.0M against $1.5M of open-market buying. RA Capital Management, L.P. sold $58.4M in discretionary trades (Dec). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $1.5M (6 lots) · 4 sellers, $59.0M (8 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| RA Capital Management, L.P. | 0 | – | 3 | $58.4M | Dec 8, 2025 |
| Tang Kevin | 6 | $1.5M | 0 | – | Jul 17, 2026 |
| Robert J. Gould | 0 | – | 3 | $489K | Feb 2, 2026 |
| Ezekowitz Alan | 0 | – | 1 | $66K | Jun 26, 2026 |
| Curtis G Oltmans | 0 | – | 1 | $45K | Dec 15, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| TANG Capital Management, LLC | 10.4% | 13G | Jul 15, 2026 | filing ↗ | |
| Kevin Tang | 10.4% | 13G | Jul 15, 2026 | filing ↗ | |
| RA Capital Management, L.P. | 9.9% | 13G | Feb 17, 2026 | filing ↗ | |
| Peter Kolchinsky | 9.9% | 13G | Feb 17, 2026 | filing ↗ | |
| Rajeev Shah | 9.9% | 13G | Feb 17, 2026 | filing ↗ | |
| RA Capital Healthcare Fund, L.P. | 9.9% | 13G | Feb 17, 2026 | filing ↗ | |
| Suvretta Capital Management, LLC | 9.4% | 13G | May 2, 2025 | filing ↗ | |
| Aaron Cowen | 9.4% | 13G | May 2, 2025 | filing ↗ | |
| ECOR1 Capital, LLC | 9.0% | 13G | Jun 25, 2026 | filing ↗ | |
| Oleg Nodelman | 9.0% | 13G | Jun 25, 2026 | filing ↗ | |
| Averill Master Fund, Ltd. | 8.6% | 13G | May 2, 2025 | filing ↗ | |
| ECOR1 Capital Fund Qualified, L.P. | 8.4% | 13G | Jun 25, 2026 | filing ↗ | |
| TCG Crossover GP II, LLC | 7.9% | 13G | May 15, 2026 | filing ↗ | |
| TCG Crossover Fund II, L.P. | 7.9% | 13G | May 15, 2026 | filing ↗ | |
| Chen Yu | 7.9% | 13G | May 15, 2026 | filing ↗ | |
| Blackrock, Inc. | 7.2% | 13G | Jul 28, 2026 | filing ↗ | |
| Aaron Cowen | 6.3% | 13G | Jan 6, 2025 | filing ↗ | |
| Blackrock Portfolio Management LLC | 6.0% | 13G | Jul 17, 2026 | filing ↗ | |
| Averill Master Fund, Ltd. | 5.8% | 13G | Jan 6, 2025 | filing ↗ | |
| TANG Capital Partners International, LP | exited | 13G | Jul 15, 2026 | filing ↗ | |
| TANG Capital Partners, LP | exited | 13G | Jul 15, 2026 | filing ↗ | |
| TANG Capital Partners III, Inc | exited | 13G | Jul 15, 2026 | filing ↗ | |
| TANG Capital Partners IV, Inc | exited | 13G | Jul 15, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Alan Ezekowitz | $65K | Jun 26, 2026 | filing ↗ |
| Curtis G Oltmans | $45K | Dec 15, 2025 | filing ↗ |
| RA Capital Healthcare Fund LP | $54.2M | Dec 8, 2025 | filing ↗ |
| Robert J Gould | $438K | Nov 19, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Shareholder vote (5.07) | Jun 24, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 5, 2026 | filing ↗ |
| Other events (8.01) | Jun 1, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 1, 2026 | filing ↗ |
| Exit or disposal costs (2.05) | May 31, 2026 | filing ↗ |
| Other events (8.01) | May 31, 2026 | filing ↗ |
| Agreement terminated (1.02) | Apr 23, 2026 | filing ↗ |
| Earnings (2.02) | Apr 23, 2026 | filing ↗ |
| Officer/director changes (5.02) | Apr 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 23, 2026 | filing ↗ |
| Earnings (2.02) | Feb 24, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 24, 2026 | filing ↗ |
| Earnings (2.02) | Jan 12, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 12, 2026 | filing ↗ |
| Material agreement (1.01) | Dec 10, 2025 | filing ↗ |
| Other events (8.01) | Dec 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 10, 2025 | 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) | Oct 29, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 29, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 28, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 28, 2025 | filing ↗ |