Acumen PharmaceuticalsABOS
13F holders, Q2 2026 (June 30)96holders +12
30new positions
17sold out
3famous investors
$2.67avg. 13F price*
At the end of Q2 2026, 96 institutions reported holding Acumen Pharmaceuticals Inc. (ABOS) in their 13F filings, up 12 from Q1 2026. 30 opened new positions and 17 sold out. The largest holders were Ra Capital Management, L.P. ($56.1M), Sands Capital Alternatives, LLC ($9.9M) and BlackRock, Inc. ($6.6M). 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 Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 30 | $3.4M |
| Exits | 17 | $3.7M |
All 13F filers, Q1 2026 → Q2 2026: 6,026,608 shares bought and 4,170,864 shares sold, net +1,855,744 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 96 holders
| Ra Capital Management, L.P. | 0.49% | No change | 20,992,669 | $56.1M |
| Sands Capital Alternatives, LLC | 1.62% | No change | 3,720,105 | $9.9M |
| BlackRock, Inc. | 0.00% | Add +1296.4% | 2,490,115 | $6.6M |
| Alyeska Investment Group, L.P. | 0.02% | No change | 2,454,754 | $6.6M |
| Franklin Resources Inc. | 0.00% | No change | 2,305,096 | $6.2M |
| ADAR1 Capital Management, LLC | 0.27% | Reduce -2.1% | 2,111,334 | $5.6M |
| Vanguard Capital Management LLC | 0.00% | Add +11.0% | 1,672,072 | $4.5M |
| Knollwood Investment Advisory, LLC | 0.39% | No change | 1,628,510 | $4.3M |
| Geode Capital Management, LLC | 0.00% | Add +174.3% | 1,141,858 | $3.0M |
| Ikarian Capital, LLC | 0.46% | No change | 1,053,797 | $2.8M |
| Hudson Bay Capital Management LP | 0.01% | Reduce -1.4% | 955,000 | $2.5M |
| Pathstone Holdings, LLC | 0.01% | No change | 859,110 | $2.3M |
| Renaissance Technologies | 0.00% | Add +42.4% | 675,025 | $1.8M |
| Two Sigma Investments, LP | 0.00% | Add +17.4% | 622,882 | $1.7M |
| State Street Corp. | 0.00% | Add +295.8% | 600,528 | $1.6M |
| Northern Trust Corp. | 0.00% | Add +379.6% | 360,744 | $963K |
| Vanguard Portfolio Management LLC | 0.00% | New | 320,795 | $857K |
| Dimensional Fund Advisors LP | 0.00% | Add +143.5% | 291,559 | $779K |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +46.2% | 291,240 | $778K |
| Bank of America Corp. | 0.00% | Reduce -14.2% | 274,781 | $734K |
| Boothbay Fund Management, LLC | 0.01% | No change | 273,012 | $729K |
| Acadian Asset Management LLC | 0.00% | Add +45.5% | 270,338 | $718K |
| Nomura Holdings Inc. | 0.00% | New | 189,712 | $507K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -11.0% | 183,927 | $491K |
| Bridgeway Capital Management, LLC | 0.01% | No change | 176,171 | $470K |
| Morgan Stanley | 0.00% | Reduce -5.4% | 136,763 | $365K |
| Susquehanna International Group, LLP | 0.00% | Reduce -79.0% | 126,104 | $337K |
| Bank of New York Mellon Corp | 0.00% | New | 124,377 | $332K |
| Charles Schwab Investment Management Inc. | 0.00% | New | 115,099 | $307K |
| PFG Investments, LLC | 0.01% | Add +16.6% | 94,250 | $252K |
| Catalyst Financial Partners LLC | 0.02% | No change | 89,699 | $239K |
| Nuveen, LLC | 0.00% | New | 63,355 | $169K |
| Millennium Management | 0.00% | Reduce -90.8% | 60,598 | $162K |
| Squarepoint Ops LLC | 0.00% | Add +248.7% | 52,351 | $140K |
| Citadel Advisors | 0.00% | New | 51,049 | $136K |
| Prospera Financial Services Inc | 0.00% | No change | 50,000 | $134K |
| Wells Fargo & Company | 0.00% | Add +391.6% | 49,686 | $133K |
| Marshall Wace, LLP | 0.00% | Reduce -75.1% | 48,114 | $128K |
| Deutsche Bank AG | 0.00% | New | 46,132 | $123K |
| Verdad Advisers, LP | 0.11% | Add +19.3% | 44,478 | $119K |
| T. Rowe Price Associates Inc. | 0.00% | New | 39,327 | $106K |
| Barclays PLC | 0.00% | Add +29.3% | 39,655 | $106K |
| Qube Research & Technologies Ltd | 0.00% | Reduce -67.9% | 38,614 | $103K |
| New York State Common Retirement Fund | 0.00% | New | 36,200 | $97K |
| Rhumbline Advisers | 0.00% | New | 35,034 | $94K |
| Rangeley Capital, LLC | 0.09% | No change | 35,000 | $93K |
| XTX Topco Ltd | 0.00% | New | 32,134 | $86K |
| Intrepid Financial Planning Group LLC | 0.03% | No change | 30,150 | $81K |
| Y-Intercept (Hong Kong) Ltd | 0.00% | New | 29,540 | $79K |
| Quantinno Capital Management LP | 0.00% | New | 26,769 | $71K |
| UBS Group AG | 0.00% | Reduce -30.6% | 25,765 | $69K |
| Invesco Ltd. | 0.00% | New | 24,588 | $66K |
| Axq Capital, LP | 0.01% | Reduce -14.3% | 24,426 | $65K |
| American Century Companies Inc. | 0.00% | Add +34.6% | 24,136 | $64K |
| Citigroup Inc. | 0.00% | Add +387.9% | 21,889 | $58K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | New | 21,761 | $58K |
| JPMorgan Chase & Co. | 0.00% | Add +1296.2% | 20,161 | $56K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | New | 19,393 | $52K |
| Independent Advisor Alliance | 0.00% | No change | 19,000 | $51K |
| Pinnacle Wealth Management Advisory Group, LLC | 0.00% | No change | 18,020 | $48K |
| Pinnacle Associates Ltd. | 0.00% | No change | 18,020 | $48K |
| Factor Wealth Management LTD | 0.01% | No change | 16,500 | $44K |
| Spark Investment Management LLC | 0.08% | New | 14,700 | $39K |
| Stifel Financial Corp. | 0.00% | New | 12,900 | $34K |
| Virtu Financial LLC | 0.00% | New | 11,940 | $32K |
| Two Sigma Securities, LLC | 0.00% | New | 11,892 | $32K |
| Balyasny Asset Management L.P. | 0.00% | New | 11,872 | $32K |
| Sei Investments Co. | 0.00% | No change | 11,564 | $31K |
| BNP Paribas Financial Markets | 0.00% | Add +837.8% | 11,329 | $30K |
| Mesirow Financial Investment Management, Inc. | 0.00% | No change | 11,305 | $30K |
| Bronte Capital Management Pty Ltd. | 0.00% | New | 10,716 | $29K |
| Intech Investment Management LLC | 0.00% | New | 10,446 | $28K |
| Integrated Wealth Concepts LLC | 0.00% | No change | 10,179 | $27K |
| Steward Partners Investment Advisory, LLC | 0.00% | New | 10,000 | $27K |
| FMR LLC | 0.00% | Reduce -99.3% | 7,530 | $20K |
| Osaic Holdings, Inc. | 0.00% | Add +37.4% | 7,350 | $20K |
| Vanguard Global Advisers, LLC | 0.00% | No change | 6,684 | $18K |
| Legal & General Group Plc | 0.00% | New | 4,610 | $12K |
| Ameritas Investment Partners, Inc. | 0.00% | New | 4,289 | $11K |
| Russell Investments Group, Ltd. | 0.00% | New | 3,779 | $10K |
| PNC Financial Services Group, Inc. | 0.00% | No change | 3,080 | $8K |
| Rockefeller Capital Management L.P. | 0.00% | No change | 3,000 | $8K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +2356.8% | 2,899 | $8K |
| TFC Financial Management, Inc. | 0.00% | No change | 2,500 | $7K |
| Jones Financial Companies LLLP | 0.00% | No change | 2,000 | $5K |
| Royal Bank of Canada | 0.00% | Reduce -78.0% | 1,561 | $4K |
| Nisa Investment Advisors, LLC | 0.00% | No change | 1,229 | $3K |
| US Bancorp \de | 0.00% | No change | 1,000 | $3K |
| Sterling Capital Management LLC | 0.00% | New | 952 | $3K |
| Group One Trading LLC | 0.00% | Reduce -51.0% | 722 | $2K |
| EverSource Wealth Advisors, LLC | 0.00% | No change | 407 | $1K |
| Avion Wealth | 0.00% | New | 500 | $1K |
| SBI Securities Co., Ltd. | 0.00% | Reduce -4.0% | 291 | $777 |
| Farther Finance Advisors, LLC | 0.00% | No change | 200 | $534 |
| Caitong International Asset Management Co., Ltd | 0.00% | New | 39 | $104 |
| Arax Advisory Partners | 0.00% | No change | 26 | $69 |
"% of holder's portfolio" is ABOS's weight in each manager's 13F, not the share of Acumen Pharmaceuticals Inc. the manager owns.