Acumen Pharmaceuticals, Inc. - ABOS
Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 8 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | History | No change | 14,932,063 | 31,506 | 0.32% | 0.31% | 1 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Sands Capital Alternatives, LLC | History | No change | 3,417,075 | 7,210 | 1.39% | 1.28% | 2 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| FRANKLIN RESOURCES INC | History | No change | 2,305,096 | 4,863 | 0.0% | 0.0% | 3 | 0 | 0.0% | Q4 2025 | Feb 11, 2026 |
| FMR LLC | History | Reduced | 2,027,497 | 4,278 | 0.0% | 0.0% | 4 | -1,828 | -0.09% | Q4 2025 | Feb 17, 2026 |
| VANGUARD GROUP INC | History | Added to | 1,653,772 | 3,489 | 0.0% | 0.0% | 5 | +2,300 | 0.14% | Q4 2025 | Jan 29, 2026 |
| Knollwood Investment Advisory, LLC | History | No change | 1,628,510 | 3,436 | 0.32% | 0.25% | 6 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| Alyeska Investment Group, L.P. | History | No change | 939,603 | 1,982 | 0.01% | 0.0% | 7 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| ADAR1 Capital Management, LLC | History | No change | 891,183 | 1,880 | 0.14% | 0.14% | 8 | 0 | 0.0% | Q4 2025 | Feb 18, 2026 |
| Laurion Capital Management LP | History | No change | 867,046 | 1,829 | 0.07% | 0.03% | 9 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Pathstone Holdings, LLC | History | New | 859,110 | 1,812 | 0.01% | — | 10 | +859,110 | New | Q4 2025 | Feb 13, 2026 |
| Hudson Bay Capital Management LP | History | Reduced | 725,000 | 1,529 | 0.01% | 0.0% | 11 | -4 | -0.0% | Q4 2025 | Feb 13, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Reduced | 584,143 | 1,232 | 0.0% | 0.0% | 12 | -17,573 | -2.92% | Q4 2025 | Feb 17, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Reduced | 423,100 | 892 | 0.0% | 0.0% | 13 | -161,192 | -27.59% | Q4 2025 | Feb 12, 2026 |
| TWO SIGMA ADVISERS, LP | History | Reduced | 421,800 | 889 | 0.0% | 0.0% | 14 | -1,800 | -0.42% | Q4 2025 | Feb 17, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 410,206 | 865 | 0.0% | 0.0% | 15 | +11,428 | 2.87% | Q4 2025 | Feb 09, 2026 |
| SG Americas Securities, LLC | History | Reduced | 401,047 | 846 | 0.0% | 0.0% | 16 | -2,831 | -0.7% | Q4 2025 | Jan 09, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Added to | 373,198 | 787 | 0.0% | 0.0% | 17 | +158,758 | 74.03% | Q4 2025 | Feb 17, 2026 |
| CITADEL ADVISORS LLC | History | Reduced | 372,083 | 785 | 0.0% | 0.0% | 18 | -133,625 | -26.42% | Q4 2025 | Feb 17, 2026 |
| Ikarian Capital, LLC | History | Reduced | 254,312 | 536 | 0.04% | 0.05% | 19 | -11,457 | -4.31% | Q4 2025 | Feb 18, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 240,152 | 506 | 0.0% | 0.0% | 20 | +26,423 | 12.36% | Q4 2025 | Feb 17, 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | History | Reduced | 170,171 | 359 | 0.01% | 0.01% | 21 | -20,000 | -10.52% | Q4 2025 | Feb 17, 2026 |
| BlackRock, Inc. | History | Reduced | 169,505 | 357 | 0.0% | 0.0% | 22 | -5,185 | -2.97% | Q4 2025 | Feb 12, 2026 |
| MORGAN STANLEY | History | Added to | 166,905 | 352 | 0.0% | 0.0% | 23 | +17,504 | 11.72% | Q4 2025 | Feb 13, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | Added to | 152,780 | 320 | 0.0% | 0.0% | 24 | +74,860 | 96.07% | Q4 2025 | Feb 10, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | Reduced | 143,221 | 302 | 0.0% | 0.0% | 25 | -56,225 | -28.19% | Q4 2025 | Feb 17, 2026 |
| JANE STREET GROUP, LLC | History | Reduced | 142,123 | 299 | 0.0% | 0.0% | 26 | -65,116 | -31.42% | Q4 2025 | Feb 12, 2026 |
| GOLDMAN SACHS GROUP INC | History | Reduced | 117,851 | 248 | 0.0% | 0.0% | 27 | -29,297 | -19.91% | Q4 2025 | Mar 25, 2026 |
| STATE STREET CORP | History | Reduced | 100,178 | 211 | 0.0% | 0.0% | 28 | -6,500 | -6.09% | Q4 2025 | Feb 13, 2026 |
| CATALYST FINANCIAL PARTNERS LLC | History | No change | 89,699 | 189 | 0.02% | 0.02% | 29 | 0 | 0.0% | Q4 2025 | Feb 04, 2026 |
| NORTHERN TRUST CORP | History | Added to | 75,212 | 158 | 0.0% | 0.0% | 30 | +10,258 | 15.79% | Q4 2025 | Feb 17, 2026 |
| Prospera Financial Services Inc | History | New | 50,000 | 105 | 0.0% | — | 31 | +50,000 | New | Q4 2025 | Feb 09, 2026 |
| XTX Topco Ltd | History | New | 49,563 | 104 | 0.0% | — | 32 | +49,563 | New | Q4 2025 | Feb 17, 2026 |
| Quadrature Capital Ltd | History | New | 49,046 | 103 | 0.0% | — | 34 | +49,046 | New | Q4 2025 | Feb 17, 2026 |
| DIMENSIONAL FUND ADVISORS LP | History | Added to | 49,062 | 103 | 0.0% | 0.0% | 33 | +5,538 | 12.72% | Q4 2025 | Feb 12, 2026 |
| Qube Research & Technologies Ltd | History | Added to | 47,985 | 101 | 0.0% | 0.0% | 35 | +15,104 | 45.94% | Q4 2025 | Feb 17, 2026 |
| BOOTHBAY FUND MANAGEMENT, LLC | History | Reduced | 39,585 | 83 | 0.0% | 0.0% | 36 | -11,457 | -22.45% | Q4 2025 | Feb 17, 2026 |
| Point72 Asset Management, L.P. | History | New | 36,365 | 76 | 0.0% | — | 37 | +36,365 | New | Q4 2025 | Feb 17, 2026 |
| BARCLAYS PLC | History | No change | 29,991 | 63 | 0.0% | 0.0% | 38 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| Intrepid Financial Planning Group LLC | History | No change | 30,150 | 63 | 0.02% | 0.02% | 39 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| Catalyst Funds Management Pty Ltd | History | No change | 29,600 | 62 | 0.01% | 0.01% | 40 | 0 | 0.0% | Q4 2025 | Feb 09, 2026 |
| OMERS ADMINISTRATION Corp | History | New | 22,454 | 47 | 0.0% | — | 41 | +22,454 | New | Q4 2025 | Feb 13, 2026 |
| UBS Group AG | History | Reduced | 21,562 | 45 | 0.0% | 0.0% | 42 | -9,279 | -30.09% | Q4 2025 | Jan 29, 2026 |
| MARSHALL WACE, LLP | History | New | 20,907 | 44 | 0.0% | — | 43 | +20,907 | New | Q4 2025 | Feb 13, 2026 |
| Independent Advisor Alliance | History | New | 19,000 | 40 | 0.0% | — | 44 | +19,000 | New | Q4 2025 | Feb 04, 2026 |
| PFG Investments, LLC | History | Added to | 19,000 | 40 | 0.0% | 0.0% | 45 | +7,500 | 65.22% | Q4 2025 | Jan 26, 2026 |
| PINNACLE ASSOCIATES LTD | History | No change | 18,020 | 38 | 0.0% | 0.0% | 46 | 0 | 0.0% | Q4 2025 | Feb 05, 2026 |
| Pinnacle Wealth Management Advisory Group, LLC | History | No change | 18,020 | 38 | 0.0% | 0.0% | 47 | 0 | 0.0% | Q4 2025 | Feb 02, 2026 |
| CLUNE & ASSOCIATES, LTD. | History | No change | 16,500 | 34 | 0.01% | 0.01% | 48 | 0 | 0.0% | Q4 2025 | Feb 09, 2026 |
| Virtu Financial LLC | History | New | 10,922 | 23 | 0.0% | — | 49 | +10,922 | New | Q4 2025 | Feb 23, 2026 |
| NINE MASTS CAPITAL Ltd | History | New | 10,637 | 22 | 0.0% | — | 50 | +10,637 | New | Q4 2025 | Feb 10, 2026 |
| WELLS FARGO & COMPANY/MN | History | Added to | 7,100 | 14 | 0.0% | 0.0% | 51 | +600 | 9.23% | Q4 2025 | Feb 13, 2026 |
| OSAIC HOLDINGS, INC. | History | Reduced | 6,851 | 14 | 0.0% | 0.0% | 52 | -400 | -5.52% | Q4 2025 | Feb 17, 2026 |
| GROUP ONE TRADING LLC | History | Reduced | 4,752 | 10 | 0.0% | 0.0% | 53 | -3,046 | -39.06% | Q4 2025 | Feb 12, 2026 |
| Tower Research Capital LLC (TRC) | History | New | 4,457 | 9 | 0.0% | — | 54 | +4,457 | New | Q4 2025 | Feb 17, 2026 |
| Larson Financial Group LLC | History | Added to | 4,348 | 9 | 0.0% | 0.0% | 55 | +348 | 8.7% | Q4 2025 | Feb 06, 2026 |
| PNC FINANCIAL SERVICES GROUP, INC. | History | No change | 3,080 | 6 | 0.0% | 0.0% | 56 | 0 | 0.0% | Q4 2025 | Feb 06, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 3,000 | 6 | 0.0% | 0.0% | 57 | 0 | 0.0% | Q4 2025 | Mar 16, 2026 |
| ROYAL BANK OF CANADA | History | New | 2,282 | 5 | 0.0% | — | 58 | +2,282 | New | Q4 2025 | Feb 17, 2026 |
| TFC Financial Management, Inc. | History | No change | 2,500 | 5 | 0.0% | 0.0% | 59 | 0 | 0.0% | Q4 2025 | Jan 23, 2026 |
| JPMORGAN CHASE & CO | History | Reduced | 2,409 | 4 | 0.0% | 0.0% | 60 | -623 | -20.55% | Q4 2025 | Feb 11, 2026 |
| NISA INVESTMENT ADVISORS, LLC | History | No change | 1,229 | 2 | 0.0% | 0.0% | 61 | 0 | 0.0% | Q4 2025 | Jan 15, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | No change | 1,224 | 2 | 0.0% | 0.0% | 62 | 0 | 0.0% | Q4 2025 | Feb 10, 2026 |
| GSA CAPITAL PARTNERS LLP | History | Closed out | 0 | 0 | — | 0.0% | — | -32,103 | -100.0% | Q3 2025 | Nov 07, 2025 |
| HRT FINANCIAL LP | History | Closed out | 0 | 0 | — | 0.0% | — | -14,014 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Savant Capital, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -11,045 | -100.0% | Q3 2025 | Mar 04, 2026 |
| Integrated Wealth Concepts LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -10,179 | -100.0% | Q3 2025 | Nov 14, 2025 |
| SIMPLEX TRADING, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -2,000 | -100.0% | Q3 2025 | Nov 12, 2025 |
| Advisory Services Network, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -1,111 | -100.0% | Q3 2025 | Nov 18, 2025 |
| CWM, LLC | History | Reduced | 147 | 0 | — | 0.0% | — | -597 | -80.24% | Q4 2025 | Jan 26, 2026 |
| Bell Investment Advisors, Inc | History | Closed out | 0 | 0 | — | — | — | -362 | -100.0% | Q3 2025 | Nov 21, 2025 |
| FLAGSHIP HARBOR ADVISORS, LLC | History | New | 350 | 0 | — | — | — | +350 | New | Q4 2025 | Jan 21, 2026 |
| SBI Securities Co., Ltd. | History | Reduced | 323 | 0 | — | — | — | -195 | -37.64% | Q4 2025 | Feb 03, 2026 |
| CITIGROUP INC | History | Closed out | 0 | 0 | — | — | — | -151 | -100.0% | Q3 2025 | Nov 10, 2025 |
| Clearstead Advisors, LLC | History | New | 60 | 0 | — | — | — | +60 | New | Q4 2025 | Feb 09, 2026 |
| Optiver Holding B.V. | History | Reduced | 5 | 0 | — | — | — | -1 | -16.67% | Q4 2025 | Feb 17, 2026 |
| NBT BANK N A /NY | History | No change | 2 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Jan 23, 2026 |
| Arax Advisory Partners | History | No change | 26 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| EverSource Wealth Advisors, LLC | History | No change | 407 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 06, 2026 |
| Farther Finance Advisors, LLC | History | No change | 200 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Jan 23, 2026 |