ACUMEN PHARMACEUTICALS INC (ABOS) is held by 52 institutional investors that disclose positions via SEC 13F filings. The largest disclosed holder is RA CAPITAL MANAGEMENT, L.P. as of Q1 2026.

Are institutions buying or selling ABOS?

In Q1 2026, 37 institutions opened or increased positions in ACUMEN PHARMACEUTICALS INC while 11 reduced or exited — a net buying quarter.

What is the Smart Money Verdict on ABOS?

The Smart Money Verdict combines four independent sources (institutional 13F activity, insider trades, activist filings, and congressional trades) into a single assessment for ACUMEN PHARMACEUTICALS INC.

How many hedge funds hold ABOS?

52 institutional investors report holding ACUMEN PHARMACEUTICALS INC (ABOS) as of Q1 2026, based on SEC 13F filings.

Is institutional money flowing into ABOS?

As of Q1 2026, tracked institutions in ACUMEN PHARMACEUTICALS INC show 37 buyers versus 11 sellers — net inflows.

ACUMEN PHARMACEUTICALS INC

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

Holders

(5 Elite)

$82.7M

Total Value

77% (48)

Consensus

37 buying - 11 selling

13F: Mar 31, 2026Insider & Congress: Updated regularly

Smart Money Verdict

View all

Held by 52 funds

5 elite

Who's Trading

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

Activist

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

InsiderMMMeisner Derek MSell $7KMar 6, 2026

InsiderMMMeisner Derek MSell $28KFeb 27, 2026

InsiderMMMeisner Derek MSell $8KJan 28, 2026

InsiderMMMeisner Derek MSell $45KJan 26, 2026

InsiderMMMeisner Derek MSell $11KJan 23, 2026

InsiderOJOConnell Daniel JosephSell $5KJan 22, 2026

InsiderZMZuga MattSell $3KJan 22, 2026

InsiderSESiemers EricSell $2KJan 22, 2026

View all insider trades View all activist filings

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
RA CAPITAL MANAGEMENT, L.P.	Increased	21M(+40.6%)	$49.5M	0.5%	-70.41%	55
AIAlyeska Investment Group, L.P.	Increased	2.5M(+161.3%)	$5.8M	0.0%	-27.11%	44
FRANKLIN RESOURCES INC	Unchanged	2.3M	$5.4M	0.0%	-34.55%	0
VAVANGUARD CAPITAL MANAGEMENT LLC	New	1.5M	$3.6M	0.0%	-20.54%	37
FMR LLC	Decreased	1.2M(-42.9%)	$2.7M	0.0%	+50.44%	0
Hudson Bay Capital Management LP	Increased	968,940(+33.6%)	$2.3M	0.0%	-26.21%	33
Pathstone Holdings, LLC	Unchanged	859,110	$2M	0.0%	+7.28%	0
MILLENNIUM MANAGEMENT LLC	Increased	659,675(+12.9%)	$1.6M	0.0%	-14.17%	29
SUSQUEHANNA INTERNATIONAL GROUP, LLP	Increased	601,476(+61.2%)	$1.4M	0.0%	+4.69%	37
TWO SIGMA INVESTMENTS, LP	Increased	530,812(+270.6%)	$1.3M	0.0%	-21.17%	41
RENAISSANCE TECHNOLOGIES LLC	Increased	473,946(+12.0%)	$1.1M	0.0%	+26.31%	28
GEODE CAPITAL MANAGEMENT, LLC	Increased	416,238(+1.5%)	$982,755	0.0%	-29.98%	25
BANK OF AMERICA CORP /DE/	Increased	320,216(+33.3%)	$755,710	0.0%	+24.72%	32
GOLDMAN SACHS GROUP INC	Increased	206,683(+75.4%)	$487,772	0.0%	+15.76%	36
VFVANGUARD FIDUCIARY TRUST CO	New	199,226	$470,173	0.0%	-20.54%	33
MWMARSHALL WACE, LLP	Increased	192,889(+822.6%)	$455,218	0.0%	-16.98%	39
BlackRock, Inc.	Increased	178,326(+5.2%)	$420,849	0.0%	+43.94%	17
STATE STREET CORP	Increased	151,728(+51.5%)	$358,078	0.0%	-8.24%	22
MORGAN STANLEY	Decreased	144,584(-13.4%)	$341,219	0.0%	+12.52%	0
Qube Research & Technologies Ltd	Increased	120,388(+150.9%)	$284,116	0.0%	-7.25%	38