Companies / Acumen Pharmaceuticals, Inc.

Acumen Pharmaceuticals, Inc.

Nasdaq: ABOSCIK 1576885NEWTON, MA

Financials

Revenue—
Net income$-121.33M
Total debt$31.57M
Cash$59.44M
Diluted EPS$-2.00
Shares outstanding72.3M

Ownership

72.3M shares outstanding · as of Aug 7, 2026
0.37%Insiders
Ownership
Insiders0.37%269,200
Institutions62.96%45,528,174
Public float36.67%26,519,911

% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.

Insiders 13

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Insider% of sharesShares
OConnell Daniel JosephCEOFormerChief Executive Officer · Director
1.22%881,275
Zuga MattFormerCFO & Chief Business Officer
0.42%304,924
Siemers EricFormerChief Medical Officer
0.35%255,371
Doherty James J.President and CDO
0.31%220,900
Barton RussellFormerChief Operating Officer
0.28%205,092
Meisner Derek MFormerChief Legal Officer & Corp Sec
0.24%173,999
Schacterle AmyFormerChief Regulatory Officer
0.13%92,303
Drapkin Kimberlee CDirector
0.07%48,300
RA Capital Management, L.P.FormerDirector · 10% owner
0.07%48,300
Kolchinsky PeterFormerDirector · 10% owner
——

Institutional holders 73

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HolderValue% of shares
RA Capital Management, L.P.$49.54M29.03%
Sands Capital Alternatives, LLC$7.21M4.73%
BlackRock, Inc.$6.65M3.44%
Franklin Resources, Inc.$4.86M3.19%
Fmr LLC$4.28M2.80%
Vanguard Group Inc$3.49M2.29%
Knollwood Investment Advisory, LLC$3.44M2.25%
Hudson Bay Capital Management LP$2.29M1.34%
Alyeska Investment Group, L.P.$1.98M1.30%
ADAR1 Capital Management, LLC$1.88M1.23%

Activity

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InsidersInstitutions
What insiders are doing in this stock (Form 4).
DateActorActionSecurityValueShares ΔPosition afterImpact
Mar 16, 2026RA Capital Management, L.P.
Director
GrantCommon Stock$20.00M+6.1M
+46.47%
19,103,785
26.42% of shares
low
Jan 7, 2026OConnell Daniel Joseph
CEO
SellCommon Stock$75.0K-38K
-5.74%
619,982
0.86% of shares
low
Jan 8, 2026Meisner Derek M
Executive
SellCommon Stock$54.9K-30K
-23.58%
97,548
0.13% of shares
low
Jan 26, 2026Meisner Derek M
Executive
SellCommon Stock$45.3K-15K
-7.98%
173,999
0.24% of shares
low
Feb 27, 2026Meisner Derek M
Executive
SellCommon Stock$28.3K-9K
-5.13%
173,999
0.24% of shares
low
Jan 26, 2026Meisner Derek M
Executive
ExerciseCommon Stock$27.9K+15K
+8.67%
189,084
0.26% of shares
low
Jan 9, 2026OConnell Daniel Joseph
CEO
SellCommon Stock$22.8K-13K
-2.12%
598,898
0.83% of shares
low
Jan 7, 2026Meisner Derek M
Executive
SellCommon Stock$20.0K-10K
-6.97%
134,459
0.19% of shares
low

5%+ ownership events

Schedule 13D / 13G
FilerStance% of classSharesDate
James B. Murray Jr.Passive13G———

Securities

via CUSIP / OpenFIGI
SymbolTypeMarketCUSIPFIGI
ABOS——00509G209—