Acumen Pharmaceuticals, Inc. - ABOS

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q2 2026 · Compare: Q1 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% 0.52% 1 0 0.0% Q2 2026 Aug 14, 2026
Sands Capital Alternatives, LLC History No change 3,720,105 9,932 1.62% 2.08% 2 0 0.0% Q2 2026 Aug 13, 2026
BlackRock, Inc. History Added to 2,490,115 6,648 0.0% 0.0% 3 +2,311,789 1296.38% 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 Reduced 2,111,334 5,637 0.26% 0.3% 6 -45,000 -2.09% Q2 2026 Aug 14, 2026
VANGUARD CAPITAL MANAGEMENT LLC History Added to 1,672,072 4,464 0.0% 0.0% 7 +165,795 11.01% 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 Added to 1,141,858 3,049 0.0% 0.0% 9 +725,620 174.33% Q2 2026 Aug 12, 2026
Ikarian Capital, LLC History No change 1,053,797 2,813 0.3% 0.2% 10 0 0.0% Q2 2026 Aug 14, 2026
Hudson Bay Capital Management LP History Reduced 955,000 2,549 0.01% 0.01% 11 -13,940 -1.44% 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 Added to 675,025 1,802 0.0% 0.0% 13 +201,079 42.43% Q2 2026 Aug 13, 2026
TWO SIGMA INVESTMENTS, LP History Added to 622,882 1,663 0.0% 0.0% 14 +92,070 17.35% Q2 2026 Aug 14, 2026
STATE STREET CORP History Added to 600,528 1,603 0.0% 0.0% 15 +448,800 295.79% Q2 2026 Aug 07, 2026
NORTHERN TRUST CORP History Added to 360,744 963 0.0% 0.0% 16 +285,532 379.64% Q2 2026 Aug 13, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC History New 320,795 856 0.0% 17 +320,795 New Q2 2026 Aug 13, 2026
DIMENSIONAL FUND ADVISORS LP History Added to 291,559 778 0.0% 0.0% 18 +171,803 143.46% Q2 2026 Aug 11, 2026
VANGUARD FIDUCIARY TRUST CO History Added to 291,240 777 0.0% 0.0% 19 +92,014 46.19% Q2 2026 Aug 13, 2026
BANK OF AMERICA CORP /DE/ History Reduced 274,781 733 0.0% 0.0% 20 -45,435 -14.19% 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 Added to 270,338 718 0.0% 0.0% 22 +84,488 45.46% Q2 2026 Aug 13, 2026
NOMURA HOLDINGS INC History New 189,712 506 0.0% 23 +189,712 New Q2 2026 Aug 14, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP History Reduced 185,504 495 0.0% 0.0% 24 -527,872 -74.0% Q2 2026 Aug 14, 2026
GOLDMAN SACHS GROUP INC History Reduced 183,927 491 0.0% 0.0% 25 -22,756 -11.01% 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 Reduced 136,763 365 0.0% 0.0% 27 -7,821 -5.41% Q2 2026 Aug 13, 2026
Bank of New York Mellon Corp History New 124,377 332 0.0% 28 +124,377 New Q2 2026 Aug 06, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INC History New 115,099 307 0.0% 29 +115,099 New Q2 2026 Aug 14, 2026
PFG Investments, LLC History Added to 94,250 251 0.01% 0.01% 30 +13,400 16.57% 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 New 63,355 169 0.0% 32 +63,355 New Q2 2026 Aug 11, 2026
MILLENNIUM MANAGEMENT LLC History Reduced 60,598 161 0.0% 0.0% 33 -599,077 -90.81% Q2 2026 Aug 14, 2026
Squarepoint Ops LLC History Added to 52,351 139 0.0% 0.0% 34 +37,336 248.66% Q2 2026 Aug 14, 2026
CITADEL ADVISORS LLC History Added to 51,049 136 0.0% 0.0% 35 +39,049 325.41% 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 Added to 49,686 132 0.0% 0.0% 37 +39,578 391.55% Q2 2026 Aug 14, 2026
MARSHALL WACE, LLP History Reduced 48,114 128 0.0% 0.0% 38 -144,775 -75.06% Q2 2026 Aug 13, 2026
DEUTSCHE BANK AG\ History New 46,132 123 0.0% 39 +46,132 New Q2 2026 Aug 07, 2026
Verdad Advisers, LP History Added to 44,478 118 0.11% 0.1% 40 +7,200 19.31% Q2 2026 Aug 14, 2026
PRICE T ROWE ASSOCIATES INC /MD/ History New 39,327 106 0.0% 41 +39,327 New Q2 2026 Aug 14, 2026
BARCLAYS PLC History Added to 39,655 105 0.0% 0.0% 42 +8,976 29.26% Q2 2026 Aug 14, 2026
Qube Research & Technologies Ltd History Reduced 38,614 103 0.0% 0.0% 43 -81,774 -67.93% Q2 2026 Aug 14, 2026
NEW YORK STATE COMMON RETIREMENT FUND History New 36,200 96 0.0% 44 +36,200 New Q2 2026 Jul 29, 2026
RHUMBLINE ADVISERS History New 35,034 93 0.0% 46 +35,034 New Q2 2026 Aug 11, 2026
Rangeley Capital, LLC History No change 35,000 93 0.08% 0.08% 45 0 0.0% Q2 2026 Aug 14, 2026
XTX Topco Ltd History New 32,134 85 0.0% 47 +32,134 New 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
Y-Intercept (Hong Kong) Ltd History New 29,540 78 0.0% 49 +29,540 New Q2 2026 Jul 13, 2026
Quantinno Capital Management LP History New 26,769 71 0.0% 50 +26,769 New Q2 2026 Aug 13, 2026
UBS Group AG History Reduced 25,765 68 0.0% 0.0% 51 -11,381 -30.64% Q2 2026 Aug 13, 2026
Invesco Ltd. History New 24,588 65 0.0% 53 +24,588 New Q2 2026 Aug 14, 2026
AXQ CAPITAL, LP History Reduced 24,426 65 0.01% 0.01% 52 -4,061 -14.26% Q2 2026 Aug 06, 2026
AMERICAN CENTURY COMPANIES INC History Added to 24,136 64 0.0% 0.0% 54 +6,207 34.62% Q2 2026 Aug 12, 2026
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. History New 21,761 58 0.0% 56 +21,761 New Q2 2026 Aug 14, 2026
CITIGROUP INC History Added to 21,889 58 0.0% 0.0% 55 +17,403 387.94% Q2 2026 Aug 03, 2026
JPMORGAN CHASE & CO History Added to 20,161 55 0.0% 0.0% 57 +18,717 1296.19% Q2 2026 Aug 12, 2026
Police & Firemen's Retirement System of New Jersey History New 19,393 51 0.0% 58 +19,393 New Q2 2026 Jul 23, 2026
Independent Advisor Alliance History No change 19,000 50 0.0% 0.0% 59 0 0.0% Q2 2026 Aug 12, 2026
PINNACLE ASSOCIATES LTD History No change 18,020 48 0.0% 0.0% 60 0 0.0% Q2 2026 Aug 03, 2026
Pinnacle Wealth Management Advisory Group, LLC History No change 18,020 48 0.0% 0.0% 61 0 0.0% Q2 2026 Aug 05, 2026
Factor Wealth Management LTD History No change 16,500 44 0.01% 0.01% 62 0 0.0% Q2 2026 Jul 07, 2026
Spark Investment Management LLC History New 14,700 39 0.08% 63 +14,700 New Q2 2026 Aug 10, 2026
STIFEL FINANCIAL CORP History New 12,900 34 0.0% 64 +12,900 New Q2 2026 Aug 12, 2026
Virtu Financial LLC History New 11,940 32 0.0% 65 +11,940 New Q2 2026 Aug 13, 2026
TWO SIGMA SECURITIES, LLC History New 11,892 31 0.0% 67 +11,892 New Q2 2026 Aug 14, 2026
BALYASNY ASSET MANAGEMENT L.P. History New 11,872 31 0.0% 66 +11,872 New Q2 2026 Aug 14, 2026
BNP PARIBAS FINANCIAL MARKETS History Added to 11,329 30 0.0% 0.0% 69 +10,121 837.83% Q2 2026 Aug 13, 2026
SEI INVESTMENTS CO History No change 11,564 30 0.0% 0.0% 68 0 0.0% Q2 2026 Aug 14, 2026
Mesirow Financial Investment Management, Inc. History No change 11,305 30 0.0% 0.0% 70 0 0.0% Q2 2026 Jul 22, 2026
Bronte Capital Management Pty Ltd. History New 10,716 28 0.0% 71 +10,716 New Q2 2026 Aug 04, 2026
INTECH INVESTMENT MANAGEMENT LLC History New 10,446 27 0.0% 73 +10,446 New 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 New 10,000 26 0.0% 74 +10,000 New Q2 2026 Aug 13, 2026
FMR LLC History Reduced 7,530 20 0.0% 0.0% 75 -1,149,816 -99.35% Q2 2026 Aug 13, 2026
OSAIC HOLDINGS, INC. History Added to 7,350 19 0.0% 0.0% 76 +1,999 37.36% Q2 2026 Aug 14, 2026
Vanguard Global Advisers, LLC History No change 6,684 17 0.0% 0.0% 77 0 0.0% Q2 2026 Aug 13, 2026
Legal & General Group Plc History New 4,610 12 0.0% 78 +4,610 New Q2 2026 Aug 14, 2026
Ameritas Investment Partners, Inc. History New 4,289 11 0.0% 79 +4,289 New Q2 2026 Aug 13, 2026
Russell Investments Group, Ltd. History New 3,779 10 0.0% 80 +3,779 New Q2 2026 Aug 06, 2026
PNC FINANCIAL SERVICES GROUP, INC. History No change 3,080 8 0.0% 0.0% 81 0 0.0% Q2 2026 Aug 07, 2026
Rockefeller Capital Management L.P. History No change 3,000 8 0.0% 0.0% 82 0 0.0% Q2 2026 Aug 13, 2026
Tower Research Capital LLC (TRC) History Added to 2,899 7 0.0% 83 +2,781 2356.78% Q2 2026 Aug 11, 2026
TFC Financial Management, Inc. History No change 2,500 6 0.0% 0.0% 84 0 0.0% Q2 2026 Jul 23, 2026
ROYAL BANK OF CANADA History Reduced 1,561 4 0.0% 0.0% 86 -5,529 -77.98% Q2 2026 Aug 14, 2026
JONES FINANCIAL COMPANIES LLLP History No change 2,000 4 0.0% 0.0% 85 0 0.0% Q2 2026 Aug 14, 2026
NISA INVESTMENT ADVISORS, LLC History No change 1,229 3 0.0% 0.0% 87 0 0.0% Q2 2026 Aug 10, 2026
Sterling Capital Management LLC History New 952 2 0.0% 89 +952 New Q2 2026 Jul 28, 2026
US BANCORP \DE\ History No change 1,000 2 0.0% 0.0% 88 0 0.0% Q2 2026 Aug 12, 2026
GROUP ONE TRADING LLC History Reduced 722 1 0.0% 0.0% 90 -6,253 -89.65% Q2 2026 Aug 13, 2026
Avion Wealth History New 500 1 0.0% 92 +500 New Q2 2026 Jul 31, 2026
EverSource Wealth Advisors, LLC History No change 407 1 0.0% 91 0 0.0% Q2 2026 Jul 24, 2026
SG Americas Securities, LLC History Closed out 0 0 0.0% -719,257 -100.0% Q2 2026 Aug 07, 2026
Laurion Capital Management LP History Closed out 0 0 0.05% -525,444 -100.0% Q2 2026 Aug 13, 2026
JANE STREET GROUP, LLC History Closed out 0 0 0.0% -132,261 -100.0% Q2 2026 Aug 14, 2026
SIMPLEX TRADING, LLC History Closed out 0 0 0.0% -75,714 -100.0% Q2 2026 Aug 12, 2026
Point72 Asset Management, L.P. History Closed out 0 0 0.0% -67,375 -100.0% Q2 2026 Aug 14, 2026
Catalyst Funds Management Pty Ltd History Closed out 0 0 0.02% -45,600 -100.0% Q2 2026 Aug 10, 2026
OMERS ADMINISTRATION Corp History Closed out 0 0 0.0% -28,600 -100.0% Q2 2026 Aug 13, 2026
CAPTRUST FINANCIAL ADVISORS History Closed out 0 0 0.0% -15,757 -100.0% Q2 2026 Aug 13, 2026
Brevan Howard Capital Management LP History Closed out 0 0 0.0% -15,385 -100.0% Q2 2026 Aug 14, 2026
HRT FINANCIAL LP History Closed out 0 0 0.0% -13,162 -100.0% Q2 2026 Aug 14, 2026
JACOBS LEVY EQUITY MANAGEMENT, INC History Closed out 0 0 0.0% -13,011 -100.0% Q2 2026 Aug 14, 2026
Schonfeld Strategic Advisors LLC History Closed out 0 0 0.0% -11,300 -100.0% Q2 2026 Aug 14, 2026
Advisory Services Network, LLC History Closed out 0 0 0.0% -1,111 -100.0% Q2 2026 Aug 12, 2026
NBT BANK, N.A. History Closed out 0 0 -200 -100.0% Q2 2026 Jul 29, 2026
Clearstead Advisors, LLC History Closed out 0 0 -60 -100.0% Q2 2026 Aug 06, 2026
Caitong International Asset Management Co., Ltd History New 39 0 +39 New Q2 2026 Aug 04, 2026
Larson Financial Group LLC History Closed out 0 0 -20 -100.0% Q2 2026 Aug 14, 2026
SBI Securities Co., Ltd. History Reduced 291 0 -12 -3.96% Q2 2026 Jul 22, 2026
Optiver Holding B.V. History Closed out 0 0 -5 -100.0% Q2 2026 Aug 12, 2026
CWM, LLC History No change 87 0 0 0.0% Q1 2026 May 14, 2026
Arax Advisory Partners History No change 26 0 0 0.0% Q2 2026 Aug 10, 2026
Farther Finance Advisors, LLC History No change 200 0 0 0.0% Q2 2026 Jul 17, 2026