Acumen Pharmaceuticals, Inc. (ABOS) Institutional Ownership

Institutions by Trading Activity

60,573,425Shares Outstanding

37,539,042Shares held by institutions

$92,346,043Value of institutional holdings

61.97%Institutional ownership %

2.45%Shares Changed QoQ

71No. of institutional investors

Acumen Pharmaceuticals, Inc. (NASDAQ:ABOS) appears in 71 institutional 13F filings for the quarter ending December 2025.

These investors held 61.8% of outstanding shares in December 2025, up from 60.6% in September 2025.
They increased total shares held in ABOS by 2.38% quarter over quarter, and investors in Acumen Pharmaceuticals decreased 10.13% from a year ago.
During the quarter, 26 of these 71 funds increased positions in ABOS, 23 reduced exposure, and 22 held steady.
Combined, these investors held 37.42Mn shares in ABOS for December 2025, up by 868.58K shares quarter on quarter, and down 5.54Mn shares year over year.
SG Americas Securities, LLC is the top holder of Acumen Pharmaceuticals as of December 31, 2025, with 719.26K shares representing 1.19% of outstanding stock.
The biggest buyers of Acumen Pharmaceuticals for the quarter ending December 2025 included SG Americas Securities, LLC (318.21K), Mesirow Financial Investment Management, Inc. (11.3K).
Per Business Quant data, the top 8 holders of Acumen Pharmaceuticals for the quarter ending December 2025 are SG Americas Securities, LLC (719.26K), Prospera Financial Services Inc (50.0K), PINNACLE ASSOCIATES LTD (18.02K), Pinnacle Wealth Management Advisory Group, LLC (18.02K), Factor Wealth Management LTD (16.5K), Mesirow Financial Investment Management, Inc. (11.3K), TFC Financial Management, Inc. (2.5K), Farther Finance Advisors, LLC (200).

37,539,042 Total Shares Held

Rows:

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
ADAR1 Capital Management, LLC	31 Dec, 2025	1,782,366	891,183	100.00%	$3,760,792.00
Laurion Capital Management LP	31 Dec, 2025	1,734,092	867,046	100.00%	$3,658,934.00
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
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	-725,008	-50.00%	$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
Ikarian Capital, LLC	31 Dec, 2025	254,312	-11,457	-4.31%	$536,599.00
Bank Of America Corp /De/	31 Dec, 2025	240,152	-187,306	-43.82%	$506,720.00

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