Acumen Pharmaceuticals, Inc. - ABOS

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q3 2026 · Compare: Q2 2026
13D/13G major owners: Ownership tab.
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
DIMENSIONAL FUND ADVISORS LP History No change 291,559 778 0.0% 0.0% 18 0 0.0% Q2 2026 Aug 11, 2026
VANGUARD FIDUCIARY TRUST CO History No change 291,240 777 0.0% 0.0% 19 0 0.0% Q2 2026 Aug 13, 2026
BANK OF AMERICA CORP /DE/ History No change 274,781 733 0.0% 0.0% 20 0 0.0% Q2 2026 Aug 14, 2026
BOOTHBAY FUND MANAGEMENT, LLC History No change 273,012 728 0.01% 0.01% 21 0 0.0% Q2 2026 Aug 14, 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
Bank of New York Mellon Corp History No change 124,377 332 0.0% 0.0% 28 0 0.0% Q2 2026 Aug 06, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INC History No change 115,099 307 0.0% 0.0% 29 0 0.0% Q2 2026 Aug 14, 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
Squarepoint Ops LLC History No change 52,351 139 0.0% 0.0% 34 0 0.0% Q2 2026 Aug 14, 2026
CITADEL ADVISORS LLC History No change 51,049 136 0.0% 0.0% 35 0 0.0% Q2 2026 Sep 02, 2026
Prospera Financial Services Inc History No change 50,000 133 0.0% 0.0% 36 0 0.0% Q2 2026 Jul 15, 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
CITIGROUP INC History No change 21,889 58 0.0% 0.0% 54 0 0.0% Q2 2026 Aug 03, 2026
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. History No change 21,761 58 0.0% 0.0% 55 0 0.0% Q2 2026 Aug 14, 2026
JPMORGAN CHASE & CO History No change 20,161 55 0.0% 0.0% 56 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% 57 0 0.0% Q2 2026 Jul 23, 2026
Independent Advisor Alliance History No change 19,000 50 0.0% 0.0% 58 0 0.0% Q2 2026 Aug 12, 2026
PINNACLE ASSOCIATES LTD History Added to 18,021 40 0.0% 0.0% 59 +1 0.01% Q3 2026 Oct 20, 2026
Pinnacle Wealth Management Advisory Group, LLC History Added to 18,021 40 0.0% 0.0% 60 +1 0.01% Q3 2026 Oct 23, 2026
Spark Investment Management LLC History No change 14,700 39 0.08% 0.08% 61 0 0.0% Q2 2026 Aug 10, 2026
Factor Wealth Management LTD History No change 16,500 36 0.01% 0.01% 62 0 0.0% Q3 2026 Oct 08, 2026
STIFEL FINANCIAL CORP History No change 12,900 34 0.0% 0.0% 63 0 0.0% Q2 2026 Aug 12, 2026
Virtu Financial LLC History No change 11,940 32 0.0% 0.0% 64 0 0.0% Q2 2026 Aug 13, 2026
BALYASNY ASSET MANAGEMENT L.P. History No change 11,872 31 0.0% 0.0% 65 0 0.0% Q2 2026 Aug 14, 2026
TWO SIGMA SECURITIES, LLC History No change 11,892 31 0.0% 0.0% 66 0 0.0% Q2 2026 Aug 14, 2026
SEI INVESTMENTS CO History No change 11,564 30 0.0% 0.0% 67 0 0.0% Q2 2026 Aug 14, 2026
BNP PARIBAS FINANCIAL MARKETS History No change 11,329 30 0.0% 0.0% 68 0 0.0% Q2 2026 Aug 13, 2026
Mesirow Financial Investment Management, Inc. History No change 11,305 30 0.0% 0.0% 69 0 0.0% Q2 2026 Jul 22, 2026
Bronte Capital Management Pty Ltd. History No change 10,716 28 0.0% 0.0% 70 0 0.0% Q2 2026 Aug 04, 2026
INTECH INVESTMENT MANAGEMENT LLC History No change 10,446 27 0.0% 0.0% 71 0 0.0% Q2 2026 Aug 10, 2026
Integrated Wealth Concepts LLC History No change 10,179 27 0.0% 0.0% 72 0 0.0% Q2 2026 Sep 08, 2026
Steward Partners Investment Advisory, LLC History No change 10,000 26 0.0% 0.0% 73 0 0.0% Q2 2026 Aug 13, 2026
FMR LLC History No change 7,530 20 0.0% 0.0% 74 0 0.0% Q2 2026 Aug 13, 2026
OSAIC HOLDINGS, INC. History No change 7,350 19 0.0% 0.0% 75 0 0.0% Q2 2026 Aug 14, 2026
Vanguard Global Advisers, LLC History No change 6,684 17 0.0% 0.0% 76 0 0.0% Q2 2026 Aug 13, 2026
Legal & General Group Plc History No change 4,610 12 0.0% 0.0% 77 0 0.0% Q2 2026 Aug 14, 2026
Ameritas Investment Partners, Inc. History No change 4,289 11 0.0% 0.0% 78 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
TFC Financial Management, Inc. History No change 2,500 5 0.0% 0.0% 83 0 0.0% Q3 2026 Oct 26, 2026
JONES FINANCIAL COMPANIES LLLP History No change 2,000 4 0.0% 0.0% 84 0 0.0% Q2 2026 Aug 14, 2026
ROYAL BANK OF CANADA History No change 1,561 4 0.0% 0.0% 85 0 0.0% Q2 2026 Aug 14, 2026
Parkside Financial Bank & Trust History New 1,016 2 0.0% — 89 +1,016 New Q3 2026 Oct 27, 2026
Sterling Capital Management LLC History Reduced 932 2 0.0% 0.0% 88 -20 -2.1% Q3 2026 Oct 22, 2026
US BANCORP \DE\ History No change 1,000 2 0.0% 0.0% 86 0 0.0% Q2 2026 Aug 12, 2026
NISA INVESTMENT ADVISORS, LLC History No change 1,229 2 0.0% 0.0% 87 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% 90 0 0.0% Q2 2026 Aug 13, 2026
EverSource Wealth Advisors, LLC History No change 407 1 0.0% 0.0% 91 0 0.0% Q2 2026 Jul 24, 2026
Avion Wealth History No change 500 1 0.0% 0.0% 92 0 0.0% Q2 2026 Jul 31, 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