Acumen Pharmaceuticals, Inc. - ABOS
Detailed investor-level table based on 13F positions.
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 | 20,992,669 | 56,050 | 0.49% | 0.49% | 1 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Sands Capital Alternatives, LLC | History | No change | 3,720,105 | 9,932 | 1.62% | 1.62% | 2 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| BlackRock, Inc. | History | No change | 2,490,115 | 6,648 | 0.0% | 0.0% | 3 | 0 | 0.0% | Q2 2026 | Aug 07, 2026 |
| Alyeska Investment Group, L.P. | History | No change | 2,454,754 | 6,554 | 0.02% | 0.02% | 4 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| FRANKLIN RESOURCES INC | History | No change | 2,305,096 | 6,154 | 0.0% | 0.0% | 5 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| ADAR1 Capital Management, LLC | History | No change | 2,111,334 | 5,637 | 0.26% | 0.26% | 6 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | History | No change | 1,672,072 | 4,464 | 0.0% | 0.0% | 7 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Knollwood Investment Advisory, LLC | History | No change | 1,628,510 | 4,348 | 0.39% | 0.39% | 8 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | No change | 1,141,858 | 3,049 | 0.0% | 0.0% | 9 | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| Ikarian Capital, LLC | History | No change | 1,053,797 | 2,813 | 0.3% | 0.3% | 10 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Hudson Bay Capital Management LP | History | No change | 955,000 | 2,549 | 0.01% | 0.01% | 11 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Pathstone Holdings, LLC | History | No change | 859,110 | 2,293 | 0.01% | 0.01% | 12 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | No change | 675,025 | 1,802 | 0.0% | 0.0% | 13 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | No change | 622,882 | 1,663 | 0.0% | 0.0% | 14 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| STATE STREET CORP | History | No change | 600,528 | 1,603 | 0.0% | 0.0% | 15 | 0 | 0.0% | Q2 2026 | Sep 22, 2026 |
| NORTHERN TRUST CORP | History | No change | 360,744 | 963 | 0.0% | 0.0% | 16 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | History | No change | 320,795 | 856 | 0.0% | 0.0% | 17 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| VANGUARD FIDUCIARY TRUST CO | History | No change | 291,240 | 777 | 0.0% | 0.0% | 18 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| BANK OF AMERICA CORP /DE/ | History | No change | 274,781 | 733 | 0.0% | 0.0% | 19 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| BOOTHBAY FUND MANAGEMENT, LLC | History | No change | 273,012 | 728 | 0.01% | 0.01% | 20 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| DIMENSIONAL FUND ADVISORS LP | History | Added to | 323,999 | 719 | 0.0% | 0.0% | 21 | +32,440 | 11.13% | Q3 2026 | Nov 04, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | No change | 270,338 | 718 | 0.0% | 0.0% | 22 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| NOMURA HOLDINGS INC | History | No change | 189,712 | 506 | 0.0% | 0.0% | 23 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | No change | 185,504 | 495 | 0.0% | 0.0% | 24 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| GOLDMAN SACHS GROUP INC | History | No change | 183,927 | 491 | 0.0% | 0.0% | 25 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | History | No change | 176,171 | 470 | 0.01% | 0.01% | 26 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| MORGAN STANLEY | History | No change | 136,763 | 365 | 0.0% | 0.0% | 27 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | History | No change | 115,099 | 307 | 0.0% | 0.0% | 28 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Bank of New York Mellon Corp | History | Reduced | 114,999 | 255 | 0.0% | 0.0% | 29 | -9,378 | -7.54% | Q3 2026 | Nov 05, 2026 |
| PFG Investments, LLC | History | No change | 94,250 | 251 | 0.01% | 0.01% | 30 | 0 | 0.0% | Q2 2026 | Jul 23, 2026 |
| CATALYST FINANCIAL PARTNERS LLC | History | No change | 89,699 | 239 | 0.02% | 0.02% | 31 | 0 | 0.0% | Q2 2026 | Jul 29, 2026 |
| Nuveen, LLC | History | No change | 63,355 | 169 | 0.0% | 0.0% | 32 | 0 | 0.0% | Q2 2026 | Aug 11, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | No change | 60,598 | 161 | 0.0% | 0.0% | 33 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| SIMPLEX TRADING, LLC | History | New | 63,600 | 141 | 0.0% | — | 34 | +63,600 | New | Q3 2026 | Nov 04, 2026 |
| Squarepoint Ops LLC | History | No change | 52,351 | 139 | 0.0% | 0.0% | 35 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| CITADEL ADVISORS LLC | History | No change | 51,049 | 136 | 0.0% | 0.0% | 36 | 0 | 0.0% | Q2 2026 | Sep 02, 2026 |
| WELLS FARGO & COMPANY/MN | History | No change | 49,686 | 132 | 0.0% | 0.0% | 37 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| MARSHALL WACE, LLP | History | No change | 48,114 | 128 | 0.0% | 0.0% | 38 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| DEUTSCHE BANK AG\ | History | No change | 46,132 | 123 | 0.0% | 0.0% | 39 | 0 | 0.0% | Q2 2026 | Aug 07, 2026 |
| Verdad Advisers, LP | History | No change | 44,478 | 118 | 0.11% | 0.11% | 40 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | History | No change | 39,327 | 106 | 0.0% | 0.0% | 41 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| BARCLAYS PLC | History | No change | 39,655 | 105 | 0.0% | 0.0% | 42 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Qube Research & Technologies Ltd | History | No change | 38,614 | 103 | 0.0% | 0.0% | 43 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| NEW YORK STATE COMMON RETIREMENT FUND | History | No change | 36,200 | 96 | 0.0% | 0.0% | 44 | 0 | 0.0% | Q2 2026 | Jul 29, 2026 |
| RHUMBLINE ADVISERS | History | No change | 35,034 | 93 | 0.0% | 0.0% | 45 | 0 | 0.0% | Q2 2026 | Aug 11, 2026 |
| Rangeley Capital, LLC | History | No change | 35,000 | 93 | 0.08% | 0.08% | 46 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| XTX Topco Ltd | History | No change | 32,134 | 85 | 0.0% | 0.0% | 47 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Intrepid Financial Planning Group LLC | History | No change | 30,150 | 80 | 0.03% | 0.03% | 48 | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| Quantinno Capital Management LP | History | No change | 26,769 | 71 | 0.0% | 0.0% | 49 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| UBS Group AG | History | No change | 25,765 | 68 | 0.0% | 0.0% | 50 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Invesco Ltd. | History | No change | 24,588 | 65 | 0.0% | 0.0% | 51 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| AXQ CAPITAL, LP | History | No change | 24,426 | 65 | 0.01% | 0.01% | 52 | 0 | 0.0% | Q2 2026 | Aug 06, 2026 |
| AMERICAN CENTURY COMPANIES INC | History | No change | 24,136 | 64 | 0.0% | 0.0% | 53 | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | History | No change | 21,761 | 58 | 0.0% | 0.0% | 54 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| JPMORGAN CHASE & CO | History | No change | 20,161 | 55 | 0.0% | 0.0% | 55 | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| Police & Firemen's Retirement System of New Jersey | History | No change | 19,393 | 51 | 0.0% | 0.0% | 56 | 0 | 0.0% | Q2 2026 | Jul 23, 2026 |
| Independent Advisor Alliance | History | No change | 19,000 | 50 | 0.0% | 0.0% | 57 | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| PINNACLE ASSOCIATES LTD | History | Added to | 18,021 | 40 | 0.0% | 0.0% | 58 | +1 | 0.01% | Q3 2026 | Oct 20, 2026 |
| Pinnacle Wealth Management Advisory Group, LLC | History | Added to | 18,021 | 40 | 0.0% | 0.0% | 59 | +1 | 0.01% | Q3 2026 | Oct 23, 2026 |
| Spark Investment Management LLC | History | No change | 14,700 | 39 | 0.08% | 0.08% | 60 | 0 | 0.0% | Q2 2026 | Aug 10, 2026 |
| Factor Wealth Management LTD | History | No change | 16,500 | 36 | 0.01% | 0.01% | 61 | 0 | 0.0% | Q3 2026 | Oct 08, 2026 |
| STIFEL FINANCIAL CORP | History | No change | 12,900 | 34 | 0.0% | 0.0% | 62 | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| Virtu Financial LLC | History | No change | 11,940 | 32 | 0.0% | 0.0% | 63 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | History | No change | 11,872 | 31 | 0.0% | 0.0% | 64 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| TWO SIGMA SECURITIES, LLC | History | No change | 11,892 | 31 | 0.0% | 0.0% | 65 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| SEI INVESTMENTS CO | History | No change | 11,564 | 30 | 0.0% | 0.0% | 66 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | No change | 11,329 | 30 | 0.0% | 0.0% | 67 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Bronte Capital Management Pty Ltd. | History | No change | 10,716 | 28 | 0.0% | 0.0% | 68 | 0 | 0.0% | Q2 2026 | Aug 04, 2026 |
| INTECH INVESTMENT MANAGEMENT LLC | History | No change | 10,446 | 27 | 0.0% | 0.0% | 69 | 0 | 0.0% | Q2 2026 | Aug 10, 2026 |
| Integrated Wealth Concepts LLC | History | No change | 10,179 | 27 | 0.0% | 0.0% | 70 | 0 | 0.0% | Q2 2026 | Sep 08, 2026 |
| Steward Partners Investment Advisory, LLC | History | No change | 10,000 | 26 | 0.0% | 0.0% | 71 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Mesirow Financial Investment Management, Inc. | History | No change | 11,305 | 25 | 0.0% | 0.0% | 72 | 0 | 0.0% | Q3 2026 | Nov 05, 2026 |
| FMR LLC | History | No change | 7,530 | 20 | 0.0% | 0.0% | 73 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| OSAIC HOLDINGS, INC. | History | No change | 7,350 | 19 | 0.0% | 0.0% | 74 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Vanguard Global Advisers, LLC | History | No change | 6,684 | 17 | 0.0% | 0.0% | 75 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Legal & General Group Plc | History | No change | 4,610 | 12 | 0.0% | 0.0% | 76 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Prospera Financial Services Inc | History | Added to | 52,500 | 11 | 0.0% | 0.0% | 78 | +2,500 | 5.0% | Q3 2026 | Nov 04, 2026 |
| Ameritas Investment Partners, Inc. | History | No change | 4,289 | 11 | 0.0% | 0.0% | 77 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Russell Investments Group, Ltd. | History | No change | 3,779 | 10 | 0.0% | 0.0% | 79 | 0 | 0.0% | Q2 2026 | Aug 06, 2026 |
| PNC FINANCIAL SERVICES GROUP, INC. | History | No change | 3,080 | 8 | 0.0% | 0.0% | 80 | 0 | 0.0% | Q2 2026 | Aug 07, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 3,000 | 8 | 0.0% | 0.0% | 81 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Tower Research Capital LLC (TRC) | History | No change | 2,899 | 7 | 0.0% | 0.0% | 82 | 0 | 0.0% | Q2 2026 | Aug 11, 2026 |
| CITIGROUP INC | History | Reduced | 2,312 | 5 | 0.0% | 0.0% | 83 | -19,577 | -89.44% | Q3 2026 | Nov 04, 2026 |
| TFC Financial Management, Inc. | History | No change | 2,500 | 5 | 0.0% | 0.0% | 84 | 0 | 0.0% | Q3 2026 | Oct 26, 2026 |
| JONES FINANCIAL COMPANIES LLLP | History | No change | 2,000 | 4 | 0.0% | 0.0% | 85 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| ROYAL BANK OF CANADA | History | No change | 1,561 | 4 | 0.0% | 0.0% | 86 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Parkside Financial Bank & Trust | History | New | 1,016 | 2 | 0.0% | — | 90 | +1,016 | New | Q3 2026 | Oct 27, 2026 |
| Sterling Capital Management LLC | History | Reduced | 932 | 2 | 0.0% | 0.0% | 89 | -20 | -2.1% | Q3 2026 | Oct 22, 2026 |
| US BANCORP \DE\ | History | No change | 1,000 | 2 | 0.0% | 0.0% | 87 | 0 | 0.0% | Q3 2026 | Nov 05, 2026 |
| NISA INVESTMENT ADVISORS, LLC | History | No change | 1,229 | 2 | 0.0% | 0.0% | 88 | 0 | 0.0% | Q3 2026 | Oct 20, 2026 |
| GAMMA Investing LLC | History | New | 877 | 1 | 0.0% | — | 93 | +877 | New | Q3 2026 | Oct 08, 2026 |
| GROUP ONE TRADING LLC | History | No change | 722 | 1 | 0.0% | 0.0% | 91 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Avion Wealth | History | No change | 500 | 1 | 0.0% | 0.0% | 92 | 0 | 0.0% | Q3 2026 | Nov 03, 2026 |
| Y-Intercept (Hong Kong) Ltd | History | Closed out | 0 | 0 | — | 0.0% | — | -29,540 | -100.0% | Q3 2026 | Oct 16, 2026 |
| SJS Investment Consulting Inc. | History | New | 183 | 0 | — | — | — | +183 | New | Q3 2026 | Oct 26, 2026 |
| Caitong International Asset Management Co., Ltd | History | Reduced | 2 | 0 | — | — | — | -37 | -94.87% | Q3 2026 | Oct 29, 2026 |
| Farther Finance Advisors, LLC | History | Added to | 225 | 0 | — | — | — | +25 | 12.5% | Q3 2026 | Oct 08, 2026 |
| SBI Securities Co., Ltd. | History | Reduced | 270 | 0 | — | — | — | -21 | -7.22% | Q3 2026 | Oct 21, 2026 |
| Arax Advisory Partners | History | No change | 26 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 10, 2026 |
| EverSource Wealth Advisors, LLC | History | No change | 407 | 0 | — | 0.0% | — | 0 | 0.0% | Q3 2026 | Nov 04, 2026 |