Acumen Pharmaceuticals, Inc. (ABOS) ownership: Top institutional holder: RA CAPITAL MANAGEMENT, L.P. ($49.54M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | 20992669.00 | $49.54M | 2026-03-31 |
| Sands Capital Alternatives, LLC | 3720105.00 | $8.78M | 2026-03-31 |
| Alyeska Investment Group, L.P. | 2454754.00 | $5.78M | 2026-03-31 |
| FRANKLIN RESOURCES INC | 2305096.00 | $5.44M | 2026-03-31 |
| ADAR1 Capital Management, LLC | 2156334.00 | $5.09M | 2026-03-31 |
| Knollwood Investment Advisory, LLC | 1628510.00 | $3.84M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1506277.00 | $3.55M | 2026-03-31 |
| VANGUARD GROUP INC | 1653772.00 | $3.49M | 2025-12-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-09 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.