Acumen Pharmaceuticals, Inc. (ABOS) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

60,115,909Shares Outstanding

26,083,334Shares held by institutions

$63,904,168Value of institutional holdings

58.88%Institutional ownership %

0.15%Shares Changed QoQ

69No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

According to SEC filings for the period ending December 2025, Acumen Pharmaceuticals, Inc. (NASDAQ:ABOS) is held by 69 institutional firms.

These investors collectively held 58.9% of the company's total shares outstanding in December 2025, down from 59.4% in September 2025.
In percentage terms, this reflects as a holdings change of 0.15% quarter on quarter, and a decrease of 12.66% year over year.
Of these 69 institutional investors, 24 increased their holdings in Acumen Pharmaceuticals, while 21 of them reduced positions, and 24 investors maintained their exposure.
Collectively, institutional investors increased their stake in Acumen Pharmaceuticals to 35.39Mn shares as of December 2025, a change that is up by 52.65K shares quarter on quarter and down 7.09Mn shares year over year.
As of December 31, 2025, RA CAPITAL MANAGEMENT, L.P. held Acumen Pharmaceuticals's largest shareholding position with over 14.93Mn shares, representing 24.84% of total outstanding shares.
Among the most significant buyers of Acumen Pharmaceuticals during December 2025 were SUSQUEHANNA INTERNATIONAL GROUP, LLP (158.76K), ACADIAN ASSET MANAGEMENT LLC (74.86K), Prospera Financial Services Inc (50.00K), XTX Topco Ltd (49.56K), Quadrature Capital Ltd (49.05K).
Leading sellers of Acumen Pharmaceuticals stock in December 2025 included RENAISSANCE TECHNOLOGIES LLC (161.19K), CITADEL ADVISORS LLC (148.82K), JANE STREET GROUP, LLC (65.12K), TWO SIGMA INVESTMENTS, LP (56.23K), GOLDMAN SACHS GROUP INC (29.30K).
The top 10 institutional holders of Acumen Pharmaceuticals for the quarter ending December 2025 included RA CAPITAL MANAGEMENT, L.P. (14.93Mn), Sands Capital Alternatives, LLC (3.42Mn), FRANKLIN RESOURCES INC (2.31Mn), FMR LLC (2.03Mn), VANGUARD GROUP INC (1.65Mn), Knollwood Investment Advisory, LLC (1.63Mn), Alyeska Investment Group, L.P. (939.60K), ADAR1 Capital Management, LLC (891.18K), Laurion Capital Management LP (867.05K), Pathstone Holdings, LLC (859.11K).

69 Institutional Holders

26,083,334 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
RA CAPITAL MANAGEMENT, L.P.	31 Dec, 2025	14,932,063	0	0.00%	$31,506,653.00
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
FMR LLC	31 Dec, 2025	2,027,497	-1,828	-0.09%	$4,278,019.00
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
ADAR1 Capital Management, LLC	31 Dec, 2025	891,183	0	0.00%	$1,880,396.00
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
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	584,143	-17,573	-2.92%	$1,232,542.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	423,100	-161,192	-27.59%	$892,741.00
TWO SIGMA ADVISERS, LP	31 Dec, 2025	421,800	-1,800	-0.42%	$889,998.00
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
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	373,198	158,758	74.03%	$787,448.00
CITADEL ADVISORS LLC	31 Dec, 2025	345,283	-148,825	-30.12%	$728,547.00
BANK OF AMERICA CORP /DE/	31 Dec, 2025	240,152	26,423	12.36%	$506,720.00
BRIDGEWAY CAPITAL MANAGEMENT, LLC	31 Dec, 2025	170,171	-20,000	-10.52%	$359,061.00

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