Acumen Pharmaceuticals, Inc.

ABOS

Exchange: Nasdaq
Industry: Biological Products, (No Diagnostic Substances)
SEC CIK: 0001576885

SEC filings (opens in a new tab)

No open-market purchases or sales by Acumen Pharmaceuticals, Inc. insiders were filed in the last 90 days; 96 institutions reported holding it in 13F filings for Q2 2026, worth $127.8M in total; no superinvestor holds it.

Q2 2026 vs. Q1 2026

How the institutions holding Acumen Pharmaceuticals, Inc. changed between Q1 2026 and Q2 2026.

All holders in Q2 2026 All holders in Q1 2026

13F holders of ABOS: Q1 2026 compared with Q2 2026
Measure	Q1 2026	Of which not filed for Q2 2026	Q2 2026	Change
Holders	84	1	96	+13
Shares	46.0M	87	47.9M	+1.86M (+4.0%)
Value	$108.5M	$205	$127.8M	+$19.2M (+17.7%)

1 institution that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (30)

Institutions that held Acumen Pharmaceuticals, Inc. at the end of Q2 2026 but not at the end of Q1 2026.

Institutions new to ABOS in Q2 2026
Institution	Shares	Value	% of portfolio
Vanguard Portfolio Management LLC	320,795	$856.5K	0.00%
Nomura Holdings Inc	189,712	$506.5K	0.00%
Bank of New York Mellon Corp	124,377	$332.1K	0.00%
Charles Schwab Investment Management Inc	115,099	$307.3K	0.00%
Nuveen, LLC	63,355	$169.2K	0.00%
Citadel Advisors LLC	51,049	$136.3K	0.00%
Deutsche Bank AG	46,132	$123.2K	0.00%
Price T Rowe Associates Inc	39,327	$106.0K	0.00%
New York State Common Retirement Fund	36,200	$96.7K	0.00%
Rhumbline Advisers	35,034	$93.5K	0.00%
XTX Topco Ltd	32,134	$85.8K	0.00%
Y-Intercept (Hong Kong) Ltd	29,540	$78.9K	0.00%
Quantinno Capital Management LP	26,769	$71.5K	0.00%
Invesco Ltd.	24,588	$65.7K	0.00%
Mirae Asset Global ETFs Holdings Ltd.	21,761	$58.1K	0.00%
Police & Firemen's Retirement System of New Jersey	19,393	$51.8K	0.00%
Spark Investment Management LLC	14,700	$39.2K	0.08%
Stifel Financial Corp	12,900	$34.4K	0.00%
Virtu Financial LLC	11,940	$32.0K	0.00%
Two Sigma Securities, LLC	11,892	$31.8K	0.00%
Balyasny Asset Management LLC	11,872	$31.7K	0.00%
Bronte Capital Management Pty Ltd.	10,716	$28.6K	0.00%
Intech Investment Management LLC	10,446	$27.9K	0.00%
Steward Partners Investment Advisory, LLC	10,000	$26.7K	0.00%
Legal & General Group Plc	4,610	$12.3K	0.00%
Ameritas Investment Partners, Inc.	4,289	$11.5K	0.00%
Russell Investments Group, Ltd.	3,779	$10.1K	0.00%
Sterling Capital Management LLC	952	$2.54K	0.00%
Avion Wealth	500	$1.00K	0.00%
Caitong International Asset Management Co., Ltd	39	$104	0.00%

Sold out (17)

Institutions that held Acumen Pharmaceuticals, Inc. at the end of Q1 2026 and filed for Q2 2026 without it.

Institutions that sold out of ABOS in Q2 2026
Institution	Shares, Q1 2026	Value, Q1 2026
SG Americas Securities, LLC	719,257	$1.70M
Laurion Capital Management LP	525,444	$1.24M
Jane Street Group, LLC	89,661	$211.6K
Point72 Asset Management, L.P.	67,375	$159.0K
Catalyst Funds Management Pty Ltd	45,600	$107.6K
Omers Administration Corp	28,600	$67.5K
Simplex Trading, LLC	17,414	$41.1K
Captrust Financial Advisors	15,757	$37.2K
Brevan Howard Capital Management LP	15,385	$36.3K
HRT Financial LP	13,162	$31.0K
Jacobs Levy Equity Management, Inc	13,011	$30.7K
Schonfeld Strategic Advisors LLC	11,300	$26.7K
Advisory Services Network, LLC	1,111	$2.62K
NBT Bank N A	200	$472
Clearstead Advisors, LLC	60	$142
Larson Financial Group LLC	20	$47
Optiver Holding B.V.	5	$12

Not filed for Q2 2026 yet (1)

Institutions that held Acumen Pharmaceuticals, Inc. at the end of Q1 2026 and haven't filed a 13F for Q2 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding ABOS in Q1 2026 that haven't filed for Q2 2026
Institution	Shares, Q1 2026	Value, Q1 2026
CWM, LLC	87	$205