Acumen PharmaceuticalsABOS
13F holders, Q4 2025 (December 31)71holders +2
12new positions
8sold out
4famous investors
$2.11avg. 13F price*
At the end of Q4 2025, 71 institutions reported holding Acumen Pharmaceuticals Inc. (ABOS) in their 13F filings, up 2 from Q3 2025. 12 opened new positions and 8 sold out. The largest holders were Ra Capital Management, L.P. ($31.5M), Sands Capital Alternatives, LLC ($7.2M) and Franklin Resources Inc. ($4.9M). 4 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 Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 12 | $578K |
| Exits | 8 | $144K |
All 13F filers, Q3 2025 → Q4 2025: 605,544 shares bought and 638,397 shares sold, net −32,853 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 71 holders
| Ra Capital Management, L.P. | 0.32% | No change | 14,932,063 | $31.5M |
| Sands Capital Alternatives, LLC | 1.39% | No change | 3,417,075 | $7.2M |
| Franklin Resources Inc. | 0.00% | No change | 2,305,096 | $4.9M |
| FMR LLC | 0.00% | Reduce -0.1% | 2,027,497 | $4.3M |
| Vanguard Group Inc. | 0.00% | Add +0.1% | 1,653,772 | $3.5M |
| Knollwood Investment Advisory, LLC | 0.32% | No change | 1,628,510 | $3.4M |
| Alyeska Investment Group, L.P. | 0.01% | No change | 939,603 | $2.0M |
| ADAR1 Capital Management, LLC | 0.14% | No change | 891,183 | $1.9M |
| Laurion Capital Management LP | 0.13% | No change | 867,046 | $1.8M |
| Pathstone Holdings, LLC | 0.01% | No change | 859,110 | $1.8M |
| Hudson Bay Capital Management LP | 0.01% | Reduce 0.0% | 725,000 | $1.5M |
| Millennium Management | 0.00% | Reduce -2.9% | 584,143 | $1.2M |
| Renaissance Technologies | 0.00% | Reduce -27.6% | 423,100 | $893K |
| Two Sigma Advisers, LP | 0.00% | Reduce -0.4% | 421,800 | $890K |
| Geode Capital Management, LLC | 0.00% | Add +2.9% | 410,206 | $866K |
| SG Americas Securities, LLC | 0.00% | Reduce -0.7% | 401,047 | $846K |
| Susquehanna International Group, LLP | 0.00% | Add +74.0% | 373,198 | $787K |
| Citadel Advisors | 0.00% | Reduce -30.1% | 345,283 | $729K |
| Ikarian Capital, LLC | 0.07% | Reduce -4.3% | 254,312 | $537K |
| Bank of America Corp. | 0.00% | Add +12.4% | 240,152 | $507K |
| Bridgeway Capital Management, LLC | 0.01% | Reduce -10.5% | 170,171 | $359K |
| BlackRock, Inc. | 0.00% | Reduce -3.0% | 169,505 | $358K |
| Morgan Stanley | 0.00% | Add +11.7% | 166,905 | $352K |
| Acadian Asset Management LLC | 0.00% | Add +96.1% | 152,780 | $320K |
| Two Sigma Investments, LP | 0.00% | Reduce -28.2% | 143,221 | $302K |
| Jane Street Group, LLC | 0.00% | Reduce -31.4% | 142,123 | $300K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -19.9% | 117,851 | $249K |
| State Street Corp. | 0.00% | Reduce -6.1% | 100,178 | $211K |
| Catalyst Financial Partners LLC | 0.02% | No change | 89,699 | $189K |
| Northern Trust Corp. | 0.00% | Add +15.8% | 75,212 | $159K |
| Prospera Financial Services Inc | 0.00% | New | 50,000 | $106K |
| XTX Topco Ltd | 0.00% | New | 49,563 | $105K |
| Dimensional Fund Advisors LP | 0.00% | Add +12.7% | 49,062 | $104K |
| Quadrature Capital Ltd | 0.00% | New | 49,046 | $103K |
| Qube Research & Technologies Ltd | 0.00% | Add +45.9% | 47,985 | $101K |
| Boothbay Fund Management, LLC | 0.00% | Reduce -22.4% | 39,585 | $84K |
| Point72 Asset Management | 0.00% | New | 36,365 | $77K |
| Intrepid Financial Planning Group LLC | 0.02% | No change | 30,150 | $64K |
| Barclays PLC | 0.00% | No change | 29,991 | $63K |
| Catalyst Funds Management Pty Ltd | 0.01% | No change | 29,600 | $62K |
| OMERS ADMINISTRATION Corp | 0.00% | New | 22,454 | $47K |
| UBS Group AG | 0.00% | Reduce -30.1% | 21,562 | $45K |
| Marshall Wace, LLP | 0.00% | New | 20,907 | $44K |
| PFG Investments, LLC | 0.00% | Add +65.2% | 19,000 | $40K |
| Independent Advisor Alliance | 0.00% | New | 19,000 | $40K |
| Pinnacle Wealth Management Advisory Group, LLC | 0.00% | No change | 18,020 | $38K |
| Pinnacle Associates Ltd. | 0.00% | No change | 18,020 | $38K |
| Factor Wealth Management LTD | 0.01% | No change | 16,500 | $35K |
| Virtu Financial LLC | 0.00% | New | 10,922 | $23K |
| NINE MASTS CAPITAL Ltd | 0.01% | New | 10,637 | $22K |
| Wells Fargo & Company | 0.00% | Add +9.2% | 7,100 | $15K |
| Osaic Holdings, Inc. | 0.00% | Reduce -5.5% | 6,851 | $14K |
| Group One Trading LLC | 0.00% | Reduce -39.1% | 4,752 | $10K |
| Tower Research Capital LLC (TRC) | 0.00% | New | 4,457 | $9K |
| Larson Financial Group LLC | 0.00% | Add +8.7% | 4,348 | $9K |
| PNC Financial Services Group, Inc. | 0.00% | No change | 3,080 | $6K |
| Rockefeller Capital Management L.P. | 0.00% | No change | 3,000 | $6K |
| TFC Financial Management, Inc. | 0.00% | No change | 2,500 | $5K |
| Royal Bank of Canada | 0.00% | Add +103.8% | 2,282 | $5K |
| JPMorgan Chase & Co. | 0.00% | Reduce -20.6% | 2,409 | $4K |
| Nisa Investment Advisors, LLC | 0.00% | No change | 1,229 | $3K |
| BNP Paribas Financial Markets | 0.00% | No change | 1,224 | $3K |
| EverSource Wealth Advisors, LLC | 0.00% | No change | 407 | $859 |
| Flagship Harbor Advisors, LLC | 0.00% | New | 350 | $739 |
| SBI Securities Co., Ltd. | 0.00% | Reduce -37.6% | 323 | $682 |
| NBT Bank, N.A. | 0.00% | No change | 2 | $422 |
| Farther Finance Advisors, LLC | 0.00% | No change | 200 | $422 |
| Clearstead Advisors, LLC | 0.00% | New | 60 | $127 |
| Arax Advisory Partners | 0.00% | No change | 26 | $55 |
| Optiver Holding B.V. | 0.00% | Reduce -16.7% | 5 | $11 |
| Cwm, LLC | 0.00% | Reduce -80.2% | 147 | $0 |
"% of holder's portfolio" is ABOS's weight in each manager's 13F, not the share of Acumen Pharmaceuticals Inc. the manager owns.