ACUMEN PHARMACEUTICALS INC

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ABOS·00509G209·US·Common Stock·Healthcare - Biotechnology-Activist

ABOS (ACUMEN PHARMACEUTICALS INC) is held by 65 institutional investors as of Q2 2026. Largest holders: RA CAPITAL MANAGEMENT, L.P. ($56.1M), BlackRock, Inc. ($6.6M), Alyeska Investment Group, L.P. ($6.6M). Net institutional sentiment: Mixed.

65

Holders

(4 Elite)

$101.6M

Total Value

65% (62)

Consensus

40 buying - 22 selling

13F: Jun 30, 2026Insider & Congress: Updated regularly

Smart Money Verdict

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Institutional (13F)25

Insider (Form 4)85

Activist (13D/13G)56

Congressional (STOCK Act)65

Holder Quality

52

★★★★★

Elite

74

★★★★

Strong

60

★★★

Solid

18

★★

Below

75

★

Weak

Held by 65 funds

4 elite

Who's Trading

Source dates: Price Aug 28, 2026 · Insiders Mar 10, 2026 · Activists Apr 7, 2026 · Congress none

ActivistJBJames B. Murray Jr.5.0%Apr 7, 2026

ActivistRA Capital Management, L.P.29.5%Mar 17, 2026

InsiderMMMeisner Derek MSell $7KMar 6, 2026

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Top Holders

Top Holders (65)History

AllNewIncreasedHeldDecreasedExited

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Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
RA CAPITAL MANAGEMENT, L.P.	Unchanged	21M	$56.1M	0.5%	-67.15%	0
BlackRock, Inc.	Increased	2.5M(+1296.4%)	$6.6M	0.0%	+11.89%	44
AIAlyeska Investment Group, L.P.	Unchanged	2.5M	$6.6M	0.0%	-19.07%	0
FRANKLIN RESOURCES INC	Unchanged	2.3M	$6.2M	0.0%	-27.34%	0
VAVANGUARD CAPITAL MANAGEMENT LLC	Increased	1.7M(+11.0%)	$4.5M	0.0%	-10.06%	30
GEODE CAPITAL MANAGEMENT, LLC	Increased	1.1M(+174.3%)	$3M	0.0%	-4.76%	43
Hudson Bay Capital Management LP	Decreased	955,000(-1.4%)	$2.5M	0.0%	-13.56%	0
Pathstone Holdings, LLC	Unchanged	859,110	$2.3M	0.0%	+19.11%	0
RENAISSANCE TECHNOLOGIES LLC	Increased	675,025(+42.4%)	$1.8M	0.0%	+29.36%	35
TWO SIGMA INVESTMENTS, LP	Increased	622,882(+17.4%)	$1.7M	0.0%	-9.81%	30
STATE STREET CORP	Increased	600,528(+295.8%)	$1.6M	0.0%	+7.37%	28
NORTHERN TRUST CORP	Increased	360,744(+379.6%)	$963,187	0.0%	+6.47%	40
VPVANGUARD PORTFOLIO MANAGEMENT LLC	New	320,795	$856,523	0.0%	+9.36%	38
DIMENSIONAL FUND ADVISORS LP	Increased	291,559(+143.5%)	$778,969	0.0%	+1.47%	40
VFVANGUARD FIDUCIARY TRUST CO	Increased	291,240(+46.2%)	$777,611	0.0%	-6.04%	34
BANK OF AMERICA CORP /DE/	Decreased	274,781(-14.2%)	$733,665	0.0%	+38.47%	0
NOMURA HOLDINGS INC	New	189,712	$506,531	0.0%	+9.36%	33
GOLDMAN SACHS GROUP INC	Decreased	183,927(-11.0%)	$491,085	0.0%	+28.53%	0
MORGAN STANLEY	Decreased	136,763(-5.4%)	$365,157	0.0%	+24.93%	0
SUSQUEHANNA INTERNATIONAL GROUP, LLP	Decreased	126,104(-79.0%)	$336,698	0.0%	+16.24%	0

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High Conviction Moves-Smart Money Convergence-Fund Consensus-Double-Down Detection

Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer