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Disclosery

ABOS ACUMEN PHARMACEUTICALS INC

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CMN (common), issuer CIK 1576885

82 managers (84 13F filers) reported a position in ABOS shares at 2026-03-31, 46,001,105 shares in all. 18 filers opened a position and 7 filers sold out during the quarter.

Managers
82
13F filers
84
New
18
Added
31
Reduced
12
Sold out
7
Shares held by filers
46,001,105

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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.20,992,669$49.5M0.52%+6,060,60613F-HRTimelineGroup
Sands Capital Alternatives, LLC3,720,105$8.78M2.08%+303,03013F-HRTimeline
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.2,454,754$5.78M0.02%+1,515,15113F-HRTimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources2,305,096$5.44M<0.01%013F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC2,156,334$5.09M0.31%+1,265,15113F-HRTimelineGroup
VANGUARD GROUP INCgroup of 3 filers holding1,712,187$4.04MnewTimeline
Knollwood Investment Advisory, LLC1,628,510$3.84M0.39%013F-HRTimeline
FMR LLCin group FMR LLC1,157,346$2.73M<0.01%-870,15113F-HRTimelineGroup
Ikarian Capital, LLCin group Ikarian Capital, LLC1,053,797$2.49M0.36%+799,48513F-HRTimelineGroup
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…968,940$2.29M0.01%+243,94013F-HRTimelineGroup
Pathstone Holdings, LLCin group Pathstone Holdings, LLC859,110$2.03M0.01%013F-HRTimelineGroup
SG Americas Securities, LLC719,257$1.7M<0.01%+318,21013F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC659,675$1.56M<0.01%+75,53213F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…601,476$1.42M<0.01%+228,27813F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP530,812$1.25M<0.01%+387,59113F-HRTimelineGroup
Laurion Capital Management LP525,444$1.24M0.12%-341,60213F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC473,946$1.12M<0.01%+50,84613F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC416,238$983K<0.01%+6,03213F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/320,216$756K<0.01%+80,06413F-HRTimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC273,012$644K0.01%+233,42713F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC206,683$488K<0.01%+88,83213F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP192,889$455K<0.01%+171,98213F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC185,850$435K<0.01%+33,07013F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.178,326$421K<0.01%+8,82113F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC176,171$416K0.01%+6,00013F-HRTimeline
STATE STREET CORPin group STATE STREET CORP151,728$358K<0.01%+51,55013F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY144,584$341K<0.01%-22,32113F-HRTimelineGroup
Qube Research & Technologies Ltd120,388$284K<0.01%+72,40313F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP119,756$282K<0.01%+70,69413F-HRTimelineGroup
CATALYST FINANCIAL PARTNERS LLC89,699$212K0.02%013F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC89,661$212K<0.01%-52,46213F-HRTimelineGroup
PFG Investments, LLC80,850$191K0.01%+61,85013F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP75,212$178K<0.01%013F-HRTimelineGroup
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.67,375$159K<0.01%+31,01013F-HRTimelineGroup
Prospera Financial Services Inc50,000$118K<0.01%013F-HRTimeline
Catalyst Funds Management Pty Ltd45,600$108K0.02%+16,00013F-HRTimeline
Verdad Advisers, LP37,278$88K0.1%new13F-HRTimeline
UBS Group AGin group UBS Group AG37,146$87.7K<0.01%+15,58413F-HRTimelineGroup
Rangeley Capital, LLC35,000$82.6K0.09%new13F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC30,679$72.4K<0.01%+68813F-HRTimelineGroup
Intrepid Financial Planning Group LLC30,150$71.2K0.03%013F-HRTimeline
OMERS ADMINISTRATION Corp28,600$67.5K<0.01%+6,14613F-HRTimeline
AXQ CAPITAL, LP28,487$67.2K0.01%new13F-HRTimeline
Independent Advisor Alliance19,000$44.8K<0.01%013F-HRTimeline
PINNACLE ASSOCIATES LTD18,020$42.5K<0.01%013F-HRTimeline
Pinnacle Wealth Management Advisory Gro…18,020$42.5K<0.01%013F-HRTimeline
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC17,929$42.3K<0.01%new13F-HRTimelineGroup
SIMPLEX TRADING, LLC17,414$41.1K<0.01%new13F-HRTimeline
Factor Wealth Management LTD16,500$38.9K0.01%013F-HRTimeline
CAPTRUST FINANCIAL ADVISORS15,757$37.2K<0.01%new13F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…15,385$36.3K<0.01%new13F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC15,015$35.4K<0.01%new13F-HRTimelineGroup
HRT FINANCIAL LP13,162$31K<0.01%new13F-HRTimeline
JACOBS LEVY EQUITY MANAGEMENT, INC13,011$30.7K<0.01%new13F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO11,564$27.3K<0.01%new13F-HRTimelineGroup
Mesirow Financial Investment Management…11,305$26.7K<0.01%new13F-HRTimeline
Schonfeld Strategic Advisors LLC11,300$26.7K<0.01%new13F-HRTimeline
Integrated Wealth Concepts LLC10,179$24K<0.01%new13F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN10,108$23.9K<0.01%+3,00813F-HR/ATimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA7,090$17K<0.01%+4,80813F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.5,351$12.6K<0.01%-1,50013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC4,486$10.6K<0.01%new13F-HRTimelineGroup
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…3,080$7.27K<0.01%013F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…3,000$7.08K<0.01%013F-HRTimelineGroup
TFC Financial Management, Inc.2,500$5.9K<0.01%013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP2,000$4.52K<0.01%new13F-HRTimelineGroup
GROUP ONE TRADING LLC1,475$3.48K<0.01%-3,27713F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO1,444$3.16K<0.01%-96513F-HR/ATimelineGroup
NISA INVESTMENT ADVISORS, LLC1,229$2.9K<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS1,208$2.85K<0.01%-1613F-HRTimelineGroup
Advisory Services Network, LLC1,111$2.62K<0.01%new13F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\1,000$2.36K<0.01%new13F-HRTimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…407$961<0.01%013F-HR/ATimelineGroup
SBI Securities Co., Ltd.303$715<0.01%-2013F-HRTimeline
Farther Finance Advisors, LLC200$510<0.01%013F-HRTimeline
NBT BANK, N.A.in group NBT BANK, N.A.200$472<0.01%+19813F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…118$278<0.01%-4,33913F-HRTimelineGroup
CWM, LLCin group CWM, LLC87$205<0.01%-6013F-HRTimelineGroup
Clearstead Advisors, LLC60$142<0.01%013F-HRTimeline
Arax Advisory Partners26$61<0.01%013F-HRTimeline
Larson Financial Group LLC20$47<0.01%-4,32813F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.5$12<0.01%013F-HR/ATimelineGroup