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Disclosery

ABOS ACUMEN PHARMACEUTICALS INC

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CMN (common), issuer CIK 1576885

68 managers (69 13F filers) reported a position in ABOS shares at 2025-09-30, 35,732,763 shares in all. 13 filers opened a position and 15 filers sold out during the quarter.

Managers
68
13F filers
69
New
13
Added
9
Reduced
27
Sold out
15
Shares held by filers
35,732,763

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
RA CAPITAL MANAGEMENT, L.P.in group RA CAPITAL MANAGEMENT, L.P.14,932,063$25.5M0.31%013F-HRTimelineGroup
Sands Capital Alternatives, LLC3,417,075$5.84M1.28%013F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources2,305,096$3.94M<0.01%-771,94313F-HRTimelineGroup
FMR LLCin group FMR LLC2,029,325$3.47M<0.01%-41113F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC1,651,472$2.82M<0.01%-37,87913F-HRTimelineGroup
Knollwood Investment Advisory, LLC1,628,510$2.78M0.25%013F-HRTimeline
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.939,603$1.61M<0.01%013F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC891,183$1.52M0.15%-25,00013F-HRTimelineGroup
Laurion Capital Management LP867,046$1.48M0.2%013F-HRTimeline
Pathstone Holdings, LLCin group Pathstone Holdings, LLC859,110$1.47M0.01%-199,42113F-HRTimelineGroup
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…725,004$1.24M0.01%-100,00013F-HR/ATimelineGroup
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding623,046$1.07M-4,039Timeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC601,716$1.03M<0.01%-1,348,40413F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC584,292$999K<0.01%+337,70413F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC494,108$845K<0.01%new13F-HRTimelineGroup
SG Americas Securities, LLC403,878$691K<0.01%new13F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC398,778$682K<0.01%+2,15213F-HRTimelineGroup
Ikarian Capital, LLCin group Ikarian Capital, LLC265,769$454K0.09%013F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…214,440$367K<0.01%+62,10213F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/213,729$365K<0.01%+66,72013F-HR/ATimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC207,239$354K<0.01%+31,56913F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC190,171$325K0.01%+75,00013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.174,690$299K<0.01%-117,26713F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY149,401$255K<0.01%-4,34713F-HR/ATimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC147,148$252K<0.01%-187,53513F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP106,678$182K<0.01%013F-HRTimelineGroup
CATALYST FINANCIAL PARTNERS LLC89,699$153K0.02%013F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC77,920$131K<0.01%new13F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP64,954$111K<0.01%-20813F-HRTimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC51,042$87.3K<0.01%013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP43,524$74.4K<0.01%013F-HRTimelineGroup
Qube Research & Technologies Ltd32,881$56.2K<0.01%-24,67813F-HRTimeline
GSA CAPITAL PARTNERS LLP32,103$55K<0.01%013F-HRTimeline
UBS Group AGin group UBS Group AG30,841$52.7K<0.01%-63,58113F-HRTimelineGroup
Intrepid Financial Planning Group LLC30,150$51.6K0.02%013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC29,991$51.3K<0.01%013F-HR/ATimelineGroup
Catalyst Funds Management Pty Ltd29,600$50.6K0.01%+9,90013F-HRTimeline
Cubist Systematic Strategies, LLC23,904$40.9K<0.01%new13F-HRTimeline
PINNACLE ASSOCIATES LTD18,020$30.8K<0.01%013F-HRTimeline
Pinnacle Wealth Management Advisory Gro…18,020$30.8K<0.01%013F-HRTimeline
Factor Wealth Management LTD16,500$28.2K0.01%013F-HRTimeline
Point72 Asia (Singapore) Pte. Ltd.16,044$27.4K<0.01%-5,29613F-HRTimeline
JACOBS LEVY EQUITY MANAGEMENT, INC16,001$27.4K<0.01%new13F-HRTimeline
HRT FINANCIAL LP14,014$23K<0.01%-17,41313F-HRTimeline
PFG Investments, LLC11,500$19.7K<0.01%new13F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC11,045$18.9K<0.01%013F-HR/ATimelineGroup
Integrated Wealth Concepts LLC10,179$17.4K<0.01%-24713F-HRTimeline
GROUP ONE TRADING LLC7,798$13.3K<0.01%-72613F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN6,500$11.1K<0.01%-32513F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.7,251$10.4K<0.01%013F-HRTimelineGroup
Larson Financial Group LLC4,000$6.84K<0.01%new13F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO3,032$5.31K<0.01%-13,64313F-HR/ATimelineGroup
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…3,080$5.27K<0.01%-1,86813F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…3,000$5.13K<0.01%new13F-HRTimelineGroup
TFC Financial Management, Inc.2,500$4.28K<0.01%new13F-HRTimeline
NISA INVESTMENT ADVISORS, LLC1,229$2.1K<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS1,224$2.09K<0.01%-81013F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA1,120$2K<0.01%+15113F-HRTimelineGroup
Advisory Services Network, LLC1,111$1.9K<0.01%new13F-HRTimeline
CWM, LLCin group CWM, LLC744$1K<0.01%-3,39213F-HRTimelineGroup
SBI Securities Co., Ltd.518$886<0.01%+513F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…407$696<0.01%-813F-HRTimelineGroup
Bell Investment Advisors, Inc362$620<0.01%new13F-HRTimeline
Farther Finance Advisors, LLC200$342<0.01%013F-HRTimeline
NBT BANK, N.A.in group NBT BANK, N.A.2$342<0.01%-19813F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC151$258<0.01%-2,96413F-HRTimelineGroup
Arax Advisory Partners26$44<0.01%new13F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.6$10<0.01%new13F-HRTimelineGroup