Acumen Pharmaceuticals, Inc.
ABOS- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001576885
No open-market purchases or sales by Acumen Pharmaceuticals, Inc. insiders were filed in the last 90 days; 96 institutions reported holding it in 13F filings for Q2 2026, worth $127.8M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Acumen Pharmaceuticals, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 84
- +14 vs. Q4 2025
- Shares held
- 46.0M
- +12.0M (+35.3%) vs. Q4 2025
- Total value
- $108.5M
- +$36.8M (+51.3%) vs. Q4 2025
- New holders
- 21
- 31 more added
- Sold out
- 7
- 12 more reduced
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ABOS on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 96 | $127.8M |
| Q1 2026 | 84 | $108.5M |
| Q4 2025 | 71 | $75.2M |
| Q3 2025 | 69 | $61.1M |
| Q2 2025 | 71 | $43.6M |
| Q1 2025 | 81 | $44.8M |
| Q4 2024 | 80 | $73.2M |
| Q3 2024 | 73 | $107.8M |
| Q2 2024 | 81 | $105.5M |
| Q1 2024 | 80 | $176.3M |
| Q4 2023 | 67 | $147.8M |
| Q3 2023 | 66 | $181.4M |
| Q2 2023 | 53 | $126.6M |
| Q1 2023 | 62 | $114.0M |
| Q4 2022 | 60 | $158.0M |
| Q3 2022 | 50 | $278.4M |
| Q2 2022 | 47 | $120.5M |
| Q1 2022 | 57 | $106.1M |
| Q4 2021 | 52 | $172.9M |
| Q3 2021 | 41 | $357.4M |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Acumen Pharmaceuticals, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Ra Capital Management, L.P. | 20,992,669 | $49.5M | 0.52% | +6,060,606+40.6% | Added |
| Sands Capital Ventures, LLC | 3,720,105 | $8.78M | 2.08% | +303,030+8.9% | Added |
| Alyeska Investment Group, L.P. | 2,454,754 | $5.78M | 0.02% | +1,515,151+161.3% | Added |
| Franklin Resources Inc | 2,305,096 | $5.44M | 0.00% | 00.0% | Unchanged |
| ADAR1 Capital Management, LLC | 2,156,334 | $5.09M | 0.31% | +1,265,151+142.0% | Added |
| Knollwood Investment Advisory, LLC | 1,628,510 | $3.84M | 0.39% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 1,506,277 | $3.55M | 0.00% | +1,506,277 | New |
| FMR LLC | 1,157,346 | $2.73M | 0.00% | −870,151−42.9% | Reduced |
| Ikarian Capital, LLC | 1,053,797 | $2.49M | 0.36% | +799,485+314.4% | Added |
| Hudson Bay Capital Management LP | 968,940 | $2.29M | 0.01% | +243,940+33.6% | Added |
| Pathstone Holdings, LLC | 859,110 | $2.03M | 0.01% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 719,257 | $1.70M | 0.00% | +318,210+79.3% | Added |
| Millennium Management LLC | 659,675 | $1.56M | 0.00% | +75,532+12.9% | Added |
| Susquehanna International Group, LLP | 601,476 | $1.42M | 0.00% | +228,278+61.2% | Added |
| Two Sigma Investments, LP | 530,812 | $1.25M | 0.00% | +387,591+270.6% | Added |
| Laurion Capital Management LP | 525,444 | $1.24M | 0.12% | −341,602−39.4% | Reduced |
| Renaissance Technologies LLC | 473,946 | $1.12M | 0.00% | +50,846+12.0% | Added |
| Geode Capital Management, LLC | 416,238 | $982.8K | 0.00% | +6,032+1.5% | Added |
| Bank of America Corp | 320,216 | $755.7K | 0.00% | +80,064+33.3% | Added |
| Boothbay Fund Management, LLC | 273,012 | $644.3K | 0.02% | +233,427+589.7% | Added |
| Goldman Sachs Group Inc | 206,683 | $487.8K | 0.00% | +88,832+75.4% | Added |
| Vanguard Fiduciary Trust Co | 199,226 | $470.2K | 0.00% | +199,226 | New |
| Marshall Wace, LLP | 192,889 | $455.2K | 0.00% | +171,982+822.6% | Added |
| Acadian Asset Management LLC | 185,850 | $435.0K | 0.00% | +33,070+21.6% | Added |
| BlackRock, Inc. | 178,326 | $420.8K | 0.00% | +8,821+5.2% | Added |
| Bridgeway Capital Management, LLC | 176,171 | $415.8K | 0.01% | +6,000+3.5% | Added |
| State Street Corp | 151,728 | $358.1K | 0.00% | +51,550+51.5% | Added |
| Morgan Stanley | 144,584 | $341.2K | 0.00% | −22,321−13.4% | Reduced |
| Qube Research & Technologies Ltd | 120,388 | $284.1K | 0.00% | +72,403+150.9% | Added |
| Dimensional Fund Advisors LP | 119,756 | $281.8K | 0.00% | +70,694+144.1% | Added |
| Catalyst Financial Partners LLC | 89,699 | $211.7K | 0.02% | 00.0% | Unchanged |
| Jane Street Group, LLC | 89,661 | $211.6K | 0.00% | −52,462−36.9% | Reduced |
| PFG Investments, LLC | 80,850 | $190.8K | 0.01% | +61,850+325.5% | Added |
| Northern Trust Corp | 75,212 | $177.5K | 0.00% | 00.0% | Unchanged |
| Point72 Asset Management, L.P. | 67,375 | $159.0K | 0.00% | +31,010+85.3% | Added |
| Prospera Financial Services Inc | 50,000 | $118.0K | 0.00% | 00.0% | Unchanged |
| Catalyst Funds Management Pty Ltd | 45,600 | $107.6K | 0.02% | +16,000+54.1% | Added |
| Verdad Advisers, LP | 37,278 | $88.0K | 0.10% | +37,278 | New |
| UBS Group AG | 37,146 | $87.7K | 0.00% | +15,584+72.3% | Added |
| Rangeley Capital, LLC | 35,000 | $82.6K | 0.09% | +35,000 | New |
| Barclays PLC | 30,679 | $72.4K | 0.00% | +688+2.3% | Added |
| Intrepid Financial Planning Group LLC | 30,150 | $71.2K | 0.03% | 00.0% | Unchanged |
| Omers Administration Corp | 28,600 | $67.5K | 0.00% | +6,146+27.4% | Added |
| Axq Capital, LP | 28,487 | $67.2K | 0.01% | +28,487 | New |
| Independent Advisor Alliance | 19,000 | $44.8K | 0.00% | 00.0% | Unchanged |
| Pinnacle Associates Ltd | 18,020 | $42.5K | 0.00% | 00.0% | Unchanged |
| Pinnacle Wealth Management Advisory Group, LLC | 18,020 | $42.5K | 0.00% | 00.0% | Unchanged |
| American Century Companies Inc | 17,929 | $42.3K | 0.00% | +17,929 | New |
| Simplex Trading, LLC | 17,414 | $41.1K | 0.00% | +17,414 | New |
| Clune & Associates, Ltd. | 16,500 | $38.9K | 0.01% | 00.0% | Unchanged |
| Captrust Financial Advisors | 15,757 | $37.2K | 0.00% | +15,757 | New |
| Brevan Howard Capital Management LP | 15,385 | $36.3K | 0.00% | +15,385 | New |
| Squarepoint Ops LLC | 15,015 | $35.4K | 0.00% | +15,015 | New |
| HRT Financial LP | 13,162 | $31.0K | 0.00% | +13,162 | New |
| Jacobs Levy Equity Management, Inc | 13,011 | $30.7K | 0.00% | +13,011 | New |
| SEI Investments Co | 11,564 | $27.3K | 0.00% | +11,564 | New |
| Mesirow Financial Investment Management, Inc. | 11,305 | $26.7K | 0.00% | +11,305 | New |
| Schonfeld Strategic Advisors LLC | 11,300 | $26.7K | 0.00% | +11,300 | New |
| Integrated Wealth Concepts LLC | 10,179 | $24.0K | 0.00% | +10,179 | New |
| Wells Fargo & Company | 10,108 | $23.9K | 0.00% | +3,008+42.4% | Added |
| Royal Bank of Canada | 7,090 | $17.0K | 0.00% | +4,808+210.7% | Added |
| Vanguard Global Advisers, LLC | 6,684 | $15.8K | 0.00% | +6,684 | New |
| Advisor Group Holdings, Inc. | 5,351 | $12.6K | 0.00% | −1,500−21.9% | Reduced |
| Citigroup Inc | 4,486 | $10.6K | 0.00% | +4,486 | New |
| The PNC Financial Services Group, Inc. | 3,080 | $7.27K | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 3,000 | $7.08K | 0.00% | 00.0% | Unchanged |
| TFC Financial Management | 2,500 | $5.90K | 0.00% | 00.0% | Unchanged |
| Jones Financial Companies LLLP | 2,000 | $4.52K | 0.00% | +2,000 | New |
| Group One Trading, L.P. | 1,475 | $3.48K | 0.00% | −3,277−69.0% | Reduced |
| JPMorgan Chase & Co | 1,444 | $3.16K | 0.00% | −965−40.1% | Reduced |
| Nisa Investment Advisors, LLC | 1,229 | $2.90K | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 1,208 | $2.85K | 0.00% | −16−1.3% | Reduced |
| Advisory Services Network, LLC | 1,111 | $2.62K | 0.00% | +1,111 | New |
| US Bancorp | 1,000 | $2.36K | 0.00% | +1,000 | New |
| EverSource Wealth Advisors, LLC | 407 | $961 | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 303 | $715 | 0.00% | −20−6.2% | Reduced |
| Farther Finance Advisors, LLC | 200 | $510 | 0.00% | 00.0% | Unchanged |
| NBT Bank N A | 200 | $472 | 0.00% | +198+9,900.0% | Added |
| Tower Research Capital LLC (TRC) | 118 | $278 | 0.00% | −4,339−97.4% | Reduced |
| CWM, LLC | 87 | $205 | 0.00% | −60−40.8% | Reduced |
| Clearstead Advisors, LLC | 60 | $142 | 0.00% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 26 | $61 | 0.00% | 00.0% | Unchanged |
| Larson Financial Group LLC | 20 | $47 | 0.00% | −4,328−99.5% | Reduced |
| Optiver Holding B.V. | 5 | $12 | 0.00% | 00.0% | Unchanged |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −421,800−100.0% | Sold out |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −345,283−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −49,563−100.0% | Sold out |
| Quadrature Capital Ltd | 0 | $0 | 0.00% | −49,046−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −10,922−100.0% | Sold out |
| Nine Masts Capital Ltd | 0 | $0 | 0.00% | −10,637−100.0% | Sold out |
| Flagship Harbor Advisors, LLC | 0 | $0 | 0.00% | −350−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |