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.

Shareholders (13F)

Quarter: Q4 2025 · Compare: Q3 2025
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 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