Acumen Pharmaceuticals, Inc. (ABOS) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

60,068,018Shares Outstanding

10,257,088Shares held by institutions

$25,745,291Value of institutional holdings

24.89%Institutional ownership %

-0.27%Shares Changed QoQ

48No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

The institutional landscape for Acumen Pharmaceuticals, Inc. (NASDAQ:ABOS) includes 48 filers as of the latest reporting cycle ending December 2025.

Institutional ownership in Acumen Pharmaceuticals edged down to 24.9% in December 2025, compared to 59.5% in September 2025.
The company experienced a -0.27% quarterly change in institutional shares held, alongside a decrease of 39.24% in total owners annually.
During the quarter, 15 institutions bought more Acumen Pharmaceuticals shares, 12 sold shares, and 21 of the 48 total investors held their position steady.
The aggregate institutional position in Acumen Pharmaceuticals now stands at 14.95Mn shares as of December 2025, after investors decreased their holdings (down by 40.38K shares quarter on quarter which is down 27.54Mn shares year over year).
The top institutional stake in Acumen Pharmaceuticals as of December 31, 2025 belongs to Sands Capital Alternatives, LLC, which owns 3.42Mn shares, or 5.69% of the company.
Among the most significant buyers of Acumen Pharmaceuticals during December 2025 were ACADIAN ASSET MANAGEMENT LLC (74.86K), Prospera Financial Services Inc (50.00K), OMERS ADMINISTRATION Corp (22.45K), MARSHALL WACE, LLP (20.91K), Independent Advisor Alliance (19.00K).
Leading sellers of Acumen Pharmaceuticals stock in December 2025 included RENAISSANCE TECHNOLOGIES LLC (161.19K), JANE STREET GROUP, LLC (65.12K), GOLDMAN SACHS GROUP INC (29.30K), UBS Group AG (9.28K), STATE STREET CORP (6.50K).
The top 10 institutional holders of Acumen Pharmaceuticals for the quarter ending December 2025 included Sands Capital Alternatives, LLC (3.42Mn), FRANKLIN RESOURCES INC (2.31Mn), VANGUARD GROUP INC (1.65Mn), Knollwood Investment Advisory, LLC (1.63Mn), Alyeska Investment Group, L.P. (939.60K), Laurion Capital Management LP (867.05K), Pathstone Holdings, LLC (859.11K), Hudson Bay Capital Management LP (725.00K), RENAISSANCE TECHNOLOGIES LLC (423.10K), GEODE CAPITAL MANAGEMENT, LLC (410.21K).

48 Institutional Holders

10,257,088 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
Sands Capital Alternatives, LLC	31 Dec, 2025	3,417,075	0	0.00%	$7,210,028.00
FRANKLIN RESOURCES INC	31 Dec, 2025	2,305,096	0	0.00%	$4,863,753.00
VANGUARD GROUP INC	31 Dec, 2025	1,653,772	2,300	0.14%	$3,489,459.00
Knollwood Investment Advisory, LLC	31 Dec, 2025	1,628,510	0	0.00%	$3,436,156.00
Alyeska Investment Group, L.P.	31 Dec, 2025	939,603	0	0.00%	$1,982,562.00
Laurion Capital Management LP	31 Dec, 2025	867,046	0	0.00%	$1,829,467.00
Pathstone Holdings, LLC	31 Dec, 2025	859,110	0	0.00%	$1,812,722.00
Hudson Bay Capital Management LP	31 Dec, 2025	725,000	-4	0.00%	$1,529,750.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	423,100	-161,192	-27.59%	$892,741.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	410,206	11,428	2.87%	$865,686.00
SG Americas Securities, LLC	31 Dec, 2025	401,047	-2,831	-0.70%	$846.00
BlackRock, Inc.	31 Dec, 2025	169,505	-5,185	-2.97%	$357,655.00
MORGAN STANLEY	31 Dec, 2025	166,905	17,504	11.72%	$352,169.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	152,780	74,860	96.07%	$320.00
JANE STREET GROUP, LLC	31 Dec, 2025	142,123	-65,116	-31.42%	$299,879.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	117,851	-29,297	-19.91%	$248,666.00
STATE STREET CORP	31 Dec, 2025	100,178	-6,500	-6.09%	$211,376.00
CATALYST FINANCIAL PARTNERS LLC	31 Dec, 2025	89,699	0	0.00%	$189,265.00
Prospera Financial Services Inc	31 Dec, 2025	50,000	50,000	0.00%	$105,500.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	49,062	5,538	12.72%	$103,520.00

1 - 20 of 48

Research Tools