Acumen PharmaceuticalsABOS
13F holders, Q3 2025 (September 30)69holders −2
13new positions
15sold out
3famous investors
$1.71avg. 13F price*
At the end of Q3 2025, 69 institutions reported holding Acumen Pharmaceuticals Inc. (ABOS) in their 13F filings, down 2 from Q2 2025. 13 opened new positions and 15 sold out. The largest holders were Ra Capital Management, L.P. ($25.5M), Sands Capital Alternatives, LLC ($5.8M) and Franklin Resources Inc. ($3.9M). 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 Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Acumen Pharmaceuticals Inc.
- CUSIP
- 00509G209
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 13 | $1.8M |
| Exits | 15 | $664K |
All 13F filers, Q2 2025 → Q3 2025: 1,623,619 shares bought and 3,504,709 shares sold, net −1,881,090 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 69 holders
| Ra Capital Management, L.P. | 0.31% | No change | 14,932,063 | $25.5M |
| Sands Capital Alternatives, LLC | 1.28% | No change | 3,417,075 | $5.8M |
| Franklin Resources Inc. | 0.00% | Reduce -25.1% | 2,305,096 | $3.9M |
| FMR LLC | 0.00% | Reduce -0.0% | 2,029,325 | $3.5M |
| Vanguard Group Inc. | 0.00% | Reduce -2.2% | 1,651,472 | $2.8M |
| Knollwood Investment Advisory, LLC | 0.25% | No change | 1,628,510 | $2.8M |
| Alyeska Investment Group, L.P. | 0.00% | No change | 939,603 | $1.6M |
| ADAR1 Capital Management, LLC | 0.15% | Reduce -2.7% | 891,183 | $1.5M |
| Laurion Capital Management LP | 0.22% | No change | 867,046 | $1.5M |
| Pathstone Holdings, LLC | 0.01% | Reduce -18.8% | 859,110 | $1.5M |
| Hudson Bay Capital Management LP | 0.01% | Reduce -12.1% | 725,004 | $1.2M |
| Millennium Management | 0.00% | Reduce -69.1% | 601,716 | $1.0M |
| Renaissance Technologies | 0.00% | Add +136.9% | 584,292 | $999K |
| Citadel Advisors | 0.00% | New | 494,108 | $845K |
| Two Sigma Advisers, LP | 0.00% | Reduce -0.6% | 423,600 | $724K |
| SG Americas Securities, LLC | 0.00% | New | 403,878 | $691K |
| Geode Capital Management, LLC | 0.00% | Add +0.5% | 398,778 | $682K |
| Ikarian Capital, LLC | 0.09% | No change | 265,769 | $454K |
| Susquehanna International Group, LLP | 0.00% | Add +40.8% | 214,440 | $367K |
| Bank of America Corp. | 0.00% | Add +45.4% | 213,729 | $365K |
| Jane Street Group, LLC | 0.00% | Add +18.0% | 207,239 | $354K |
| Two Sigma Investments, LP | 0.00% | Reduce -0.7% | 199,446 | $341K |
| Bridgeway Capital Management, LLC | 0.01% | Add +65.1% | 190,171 | $325K |
| BlackRock, Inc. | 0.00% | Reduce -40.2% | 174,690 | $299K |
| Morgan Stanley | 0.00% | Reduce -2.8% | 149,401 | $255K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -56.0% | 147,148 | $252K |
| State Street Corp. | 0.00% | No change | 106,678 | $182K |
| Catalyst Financial Partners LLC | 0.02% | No change | 89,699 | $153K |
| Acadian Asset Management LLC | 0.00% | New | 77,920 | $131K |
| Northern Trust Corp. | 0.00% | Reduce -0.3% | 64,954 | $111K |
| Boothbay Fund Management, LLC | 0.00% | No change | 51,042 | $87K |
| Dimensional Fund Advisors LP | 0.00% | No change | 43,524 | $74K |
| Qube Research & Technologies Ltd | 0.00% | Reduce -42.9% | 32,881 | $56K |
| Gsa Capital Partners LLP | 0.00% | No change | 32,103 | $55K |
| UBS Group AG | 0.00% | Reduce -67.3% | 30,841 | $53K |
| Intrepid Financial Planning Group LLC | 0.02% | No change | 30,150 | $52K |
| Barclays PLC | 0.00% | No change | 29,991 | $51K |
| Catalyst Funds Management Pty Ltd | 0.01% | Add +50.3% | 29,600 | $51K |
| Cubist Systematic Strategies, LLC | 0.00% | New | 23,904 | $41K |
| Pinnacle Wealth Management Advisory Group, LLC | 0.00% | No change | 18,020 | $31K |
| Pinnacle Associates Ltd. | 0.00% | No change | 18,020 | $31K |
| Factor Wealth Management LTD | 0.01% | No change | 16,500 | $28K |
| Point72 Asia (Singapore) Pte. Ltd. | 0.00% | Reduce -24.8% | 16,044 | $27K |
| Jacobs Levy Equity Management, Inc. | 0.00% | New | 16,001 | $27K |
| HRT Financial LP | 0.00% | Reduce -55.4% | 14,014 | $23K |
| PFG Investments, LLC | 0.00% | New | 11,500 | $20K |
| Savant Capital, LLC | 0.00% | No change | 11,045 | $19K |
| Integrated Wealth Concepts LLC | 0.00% | Reduce -2.4% | 10,179 | $17K |
| Group One Trading LLC | 0.00% | Reduce -8.5% | 7,798 | $13K |
| Wells Fargo & Company | 0.00% | Reduce -4.8% | 6,500 | $11K |
| Osaic Holdings, Inc. | 0.00% | No change | 7,251 | $10K |
| Larson Financial Group LLC | 0.00% | New | 4,000 | $7K |
| JPMorgan Chase & Co. | 0.00% | Reduce -81.8% | 3,032 | $5K |
| PNC Financial Services Group, Inc. | 0.00% | Reduce -37.8% | 3,080 | $5K |
| Rockefeller Capital Management L.P. | 0.00% | New | 3,000 | $5K |
| TFC Financial Management, Inc. | 0.00% | New | 2,500 | $4K |
| Nisa Investment Advisors, LLC | 0.00% | No change | 1,229 | $2K |
| BNP Paribas Financial Markets | 0.00% | Reduce -39.8% | 1,224 | $2K |
| Royal Bank of Canada | 0.00% | Add +15.6% | 1,120 | $2K |
| Advisory Services Network, LLC | 0.00% | New | 1,111 | $2K |
| Cwm, LLC | 0.00% | Reduce -82.0% | 744 | $1K |
| SBI Securities Co., Ltd. | 0.00% | Add +1.0% | 518 | $886 |
| EverSource Wealth Advisors, LLC | 0.00% | Reduce -1.9% | 407 | $696 |
| Bell Investment Advisors, Inc | 0.00% | New | 362 | $620 |
| NBT Bank, N.A. | 0.00% | Reduce -99.0% | 2 | $342 |
| Farther Finance Advisors, LLC | 0.00% | No change | 200 | $342 |
| Citigroup Inc. | 0.00% | Reduce -95.2% | 151 | $258 |
| Arax Advisory Partners | 0.00% | New | 26 | $44 |
| Optiver Holding B.V. | 0.00% | New | 6 | $10 |
"% of holder's portfolio" is ABOS's weight in each manager's 13F, not the share of Acumen Pharmaceuticals Inc. the manager owns.