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Disclosery

ABOS ACUMEN PHARMACEUTICALS INC

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CMN (common), issuer CIK 1576885

70 managers (71 13F filers) reported a position in ABOS shares at 2025-12-31, 35,659,962 shares in all. 12 filers opened a position and 8 filers sold out during the quarter.

Managers
70
13F filers
71
New
12
Added
13
Reduced
22
Sold out
8
Shares held by filers
35,659,962

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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.14,932,063$31.5M0.32%013F-HRTimelineGroup
Sands Capital Alternatives, LLC3,417,075$7.21M1.39%013F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources2,305,096$4.86M<0.01%013F-HRTimelineGroup
FMR LLCin group FMR LLC2,027,497$4.28M<0.01%-1,82813F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC1,653,772$3.49M<0.01%+2,30013F-HRTimelineGroup
Knollwood Investment Advisory, LLC1,628,510$3.44M0.32%013F-HRTimeline
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.939,603$1.98M0.01%013F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC891,183$1.88M0.14%013F-HR/ATimelineGroup
Laurion Capital Management LP867,046$1.83M0.12%013F-HR/ATimeline
Pathstone Holdings, LLCin group Pathstone Holdings, LLC859,110$1.81M0.01%013F-HRTimelineGroup
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…725,000$1.53M0.01%-413F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC584,143$1.23M<0.01%-17,57313F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding565,021$1.19M-58,025Timeline
RENAISSANCE TECHNOLOGIES LLC423,100$893K<0.01%-161,19213F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC410,206$866K<0.01%+11,42813F-HRTimelineGroup
SG Americas Securities, LLC401,047$846K<0.01%-2,83113F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…373,198$787K<0.01%+158,75813F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC345,283$729K<0.01%-148,82513F-HRTimelineGroup
Ikarian Capital, LLCin group Ikarian Capital, LLC254,312$537K0.07%-11,45713F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/240,152$507K<0.01%+26,42313F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC170,171$359K0.01%-20,00013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.169,505$358K<0.01%-5,18513F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY166,905$352K<0.01%+17,50413F-HR/ATimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC152,780$320K<0.01%+74,86013F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC142,123$300K<0.01%-65,11613F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC117,851$249K<0.01%-29,29713F-HR/ATimelineGroup
STATE STREET CORPin group STATE STREET CORP100,178$211K<0.01%-6,50013F-HRTimelineGroup
CATALYST FINANCIAL PARTNERS LLC89,699$189K0.02%013F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP75,212$159K<0.01%+10,25813F-HRTimelineGroup
Prospera Financial Services Inc50,000$106K<0.01%new13F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd49,563$105K<0.01%new13F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP49,062$104K<0.01%+5,53813F-HRTimelineGroup
Quadrature Capital Ltdin group Quadrature Capital Ltd49,046$103K<0.01%new13F-HRTimelineGroup
Qube Research & Technologies Ltd47,985$101K<0.01%+15,10413F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC39,585$83.5K<0.01%-11,45713F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.36,365$76.7K<0.01%new13F-HRTimelineGroup
Intrepid Financial Planning Group LLC30,150$63.6K0.02%013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC29,991$63.3K<0.01%013F-HRTimelineGroup
Catalyst Funds Management Pty Ltd29,600$62.5K0.01%013F-HRTimeline
OMERS ADMINISTRATION Corp22,454$47.4K<0.01%new13F-HRTimeline
UBS Group AGin group UBS Group AG21,562$45.5K<0.01%-9,27913F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP20,907$44.1K<0.01%new13F-HRTimelineGroup
Independent Advisor Alliance19,000$40.1K<0.01%new13F-HRTimeline
PFG Investments, LLC19,000$40.1K<0.01%+7,50013F-HRTimeline
PINNACLE ASSOCIATES LTD18,020$38K<0.01%013F-HRTimeline
Pinnacle Wealth Management Advisory Gro…18,020$38K<0.01%013F-HRTimeline
Factor Wealth Management LTD16,500$34.8K0.01%013F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC10,922$23K<0.01%new13F-HRTimelineGroup
NINE MASTS CAPITAL Ltd10,637$22.4K<0.01%new13F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN7,100$15K<0.01%+60013F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.6,851$14.5K<0.01%-40013F-HRTimelineGroup
GROUP ONE TRADING LLC4,752$10K<0.01%-3,04613F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…4,457$9.4K<0.01%new13F-HRTimelineGroup
Larson Financial Group LLC4,348$9.17K<0.01%+34813F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…3,080$6.5K<0.01%013F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…3,000$6.33K<0.01%013F-HR/ATimelineGroup
TFC Financial Management, Inc.2,500$5.28K<0.01%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA2,282$5K<0.01%+1,16213F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO2,409$4.22K<0.01%-62313F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC1,229$2.59K<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS1,224$2.58K<0.01%013F-HRTimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…407$859<0.01%013F-HRTimelineGroup
FLAGSHIP HARBOR ADVISORS, LLC350$739<0.01%new13F-HRTimeline
SBI Securities Co., Ltd.323$682<0.01%-19513F-HRTimeline
Farther Finance Advisors, LLC200$422<0.01%013F-HRTimeline
NBT BANK, N.A.in group NBT BANK, N.A.2$422<0.01%013F-HRTimelineGroup
Clearstead Advisors, LLC60$127<0.01%new13F-HRTimeline
Arax Advisory Partners26$55<0.01%013F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.5$11<0.01%-113F-HRTimelineGroup
CWM, LLCin group CWM, LLC147$00%-59713F-HRTimelineGroupValue filed as zero, left out of ratios.