Acumen PharmaceuticalsABOS
13F holders, Q1 2026 (March 31)84holders +13
18new positions
6sold out
3famous investors
$2.36avg. 13F price*
At the end of Q1 2026, 84 institutions reported holding Acumen Pharmaceuticals Inc. (ABOS) in their 13F filings, up 13 from Q4 2025. 18 opened new positions and 6 sold out. The largest holders were Ra Capital Management, L.P. ($49.5M), Sands Capital Alternatives, LLC ($8.8M) and Alyeska Investment Group, L.P. ($5.8M). 3 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Steve Cohen (0.0% of Point72 Asset Management's portfolio).
- Company
- Acumen Pharmaceuticals Inc.
- CUSIP
- 00509G209
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 18 | $617K |
| Exits | 6 | $983K |
All 13F filers, Q4 2025 → Q1 2026: 12,471,370 shares bought and 1,766,842 shares sold, net +10,704,528 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 84 holders
| Ra Capital Management, L.P. | 0.53% | Add +40.6% | 20,992,669 | $49.5M |
| Sands Capital Alternatives, LLC | 2.08% | Add +8.9% | 3,720,105 | $8.8M |
| Alyeska Investment Group, L.P. | 0.02% | Add +161.3% | 2,454,754 | $5.8M |
| Franklin Resources Inc. | 0.00% | No change | 2,305,096 | $5.4M |
| ADAR1 Capital Management, LLC | 0.31% | Add +142.0% | 2,156,334 | $5.1M |
| Knollwood Investment Advisory, LLC | 0.39% | No change | 1,628,510 | $3.8M |
| Vanguard Capital Management LLC | 0.00% | — | 1,506,277 | $3.6M |
| FMR LLC | 0.00% | Reduce -42.9% | 1,157,346 | $2.7M |
| Ikarian Capital, LLC | 0.36% | Add +314.4% | 1,053,797 | $2.5M |
| Hudson Bay Capital Management LP | 0.02% | Add +33.6% | 968,940 | $2.3M |
| Pathstone Holdings, LLC | 0.01% | No change | 859,110 | $2.0M |
| SG Americas Securities, LLC | 0.00% | Add +79.3% | 719,257 | $1.7M |
| Millennium Management | 0.00% | Add +12.9% | 659,675 | $1.6M |
| Susquehanna International Group, LLP | 0.00% | Add +61.2% | 601,476 | $1.4M |
| Two Sigma Investments, LP | 0.00% | Add +270.6% | 530,812 | $1.3M |
| Laurion Capital Management LP | 0.12% | Reduce -39.4% | 525,444 | $1.2M |
| Renaissance Technologies | 0.00% | Add +12.0% | 473,946 | $1.1M |
| Geode Capital Management, LLC | 0.00% | Add +1.5% | 416,238 | $983K |
| Bank of America Corp. | 0.00% | Add +33.3% | 320,216 | $756K |
| Boothbay Fund Management, LLC | 0.02% | Add +589.7% | 273,012 | $644K |
| Goldman Sachs Group Inc. | 0.00% | Add +75.4% | 206,683 | $488K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 199,226 | $470K |
| Marshall Wace, LLP | 0.00% | Add +822.6% | 192,889 | $455K |
| Acadian Asset Management LLC | 0.00% | Add +21.6% | 185,850 | $435K |
| BlackRock, Inc. | 0.00% | Add +5.2% | 178,326 | $421K |
| Bridgeway Capital Management, LLC | 0.01% | Add +3.5% | 176,171 | $416K |
| State Street Corp. | 0.00% | Add +51.5% | 151,728 | $358K |
| Morgan Stanley | 0.00% | Reduce -13.4% | 144,584 | $341K |
| Qube Research & Technologies Ltd | 0.00% | Add +150.9% | 120,388 | $284K |
| Dimensional Fund Advisors LP | 0.00% | Add +144.1% | 119,756 | $282K |
| Catalyst Financial Partners LLC | 0.03% | No change | 89,699 | $212K |
| Jane Street Group, LLC | 0.00% | Reduce -36.9% | 89,661 | $212K |
| PFG Investments, LLC | 0.01% | Add +325.5% | 80,850 | $191K |
| Northern Trust Corp. | 0.00% | No change | 75,212 | $178K |
| Point72 Asset Management | 0.00% | Add +85.3% | 67,375 | $159K |
| Prospera Financial Services Inc | 0.00% | No change | 50,000 | $118K |
| Catalyst Funds Management Pty Ltd | 0.02% | Add +54.0% | 45,600 | $108K |
| Verdad Advisers, LP | 0.10% | New | 37,278 | $88K |
| UBS Group AG | 0.00% | Add +72.3% | 37,146 | $88K |
| Rangeley Capital, LLC | 0.09% | New | 35,000 | $83K |
| Barclays PLC | 0.00% | Add +2.3% | 30,679 | $72K |
| Intrepid Financial Planning Group LLC | 0.03% | No change | 30,150 | $71K |
| OMERS ADMINISTRATION Corp | 0.00% | Add +27.4% | 28,600 | $67K |
| Axq Capital, LP | 0.01% | New | 28,487 | $67K |
| Independent Advisor Alliance | 0.00% | No change | 19,000 | $45K |
| Pinnacle Wealth Management Advisory Group, LLC | 0.00% | No change | 18,020 | $43K |
| Pinnacle Associates Ltd. | 0.00% | No change | 18,020 | $43K |
| American Century Companies Inc. | 0.00% | New | 17,929 | $42K |
| Simplex Trading, LLC | 0.00% | New | 17,414 | $41K |
| Factor Wealth Management LTD | 0.01% | No change | 16,500 | $39K |
| Captrust Financial Advisors | 0.00% | New | 15,757 | $37K |
| Brevan Howard Capital Management LP | 0.00% | New | 15,385 | $36K |
| Squarepoint Ops LLC | 0.00% | New | 15,015 | $35K |
| HRT Financial LP | 0.00% | New | 13,162 | $31K |
| Jacobs Levy Equity Management, Inc. | 0.00% | New | 13,011 | $31K |
| Sei Investments Co. | 0.00% | New | 11,564 | $27K |
| Mesirow Financial Investment Management, Inc. | 0.00% | New | 11,305 | $27K |
| Schonfeld Strategic Advisors LLC | 0.00% | New | 11,300 | $27K |
| Integrated Wealth Concepts LLC | 0.00% | New | 10,179 | $24K |
| Wells Fargo & Company | 0.00% | Add +42.4% | 10,108 | $24K |
| Royal Bank of Canada | 0.00% | Add +210.7% | 7,090 | $17K |
| Vanguard Global Advisers, LLC | 0.00% | — | 6,684 | $16K |
| Osaic Holdings, Inc. | 0.00% | Reduce -21.9% | 5,351 | $13K |
| Citigroup Inc. | 0.00% | New | 4,486 | $11K |
| PNC Financial Services Group, Inc. | 0.00% | No change | 3,080 | $7K |
| Rockefeller Capital Management L.P. | 0.00% | No change | 3,000 | $7K |
| TFC Financial Management, Inc. | 0.00% | No change | 2,500 | $6K |
| Jones Financial Companies LLLP | 0.00% | New | 2,000 | $5K |
| Group One Trading LLC | 0.00% | Reduce -69.0% | 1,475 | $3K |
| JPMorgan Chase & Co. | 0.00% | Reduce -40.1% | 1,444 | $3K |
| Nisa Investment Advisors, LLC | 0.00% | No change | 1,229 | $3K |
| BNP Paribas Financial Markets | 0.00% | Reduce -1.3% | 1,208 | $3K |
| Advisory Services Network, LLC | 0.00% | New | 1,111 | $3K |
| US Bancorp \de | 0.00% | New | 1,000 | $2K |
| EverSource Wealth Advisors, LLC | 0.00% | No change | 407 | $961 |
| SBI Securities Co., Ltd. | 0.00% | Reduce -6.2% | 303 | $715 |
| Farther Finance Advisors, LLC | 0.00% | No change | 200 | $510 |
| NBT Bank, N.A. | 0.00% | Add +9900.0% | 200 | $472 |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -97.3% | 118 | $278 |
| Cwm, LLC | 0.00% | Reduce -40.8% | 87 | $205 |
| Clearstead Advisors, LLC | 0.00% | No change | 60 | $142 |
| Arax Advisory Partners | 0.00% | No change | 26 | $61 |
| Larson Financial Group LLC | 0.00% | Reduce -99.5% | 20 | $47 |
| Optiver Holding B.V. | 0.00% | No change | 5 | $12 |
"% of holder's portfolio" is ABOS's weight in each manager's 13F, not the share of Acumen Pharmaceuticals Inc. the manager owns.