Acumen Pharmaceuticals, Inc. (ABOS) Insider Trading

Over the last 3 months, ABOS insiders made 0 open-market buys and 1 sale, a net sale of -$14K (SEC Form 4). Over the last 6 months, 54 institutions increased and 34 reduced their position (13F).

Insider Activity

Sentiment
0/100
Buys (3m)
0
Sells (3m)
1
Net (3m)
-$14.3K
Insider trades by month Buys Sells
Aug
Jan
Jan
Jan
Mar
Jun
Context3-month price -33.5%Institutions accumulating (13F)
DateInsiderTypeSharesPrice
Jun 10, 2026Fountain Nathan BdirectorSell6,400$2.23
Jun 5, 2026Porter DerrelldirectorGrant53,250$2.29
Jun 5, 2026Ives Jeffrey L.directorGrant35,500—
Jun 5, 2026Ives Jeffrey L.directorGrant53,250$2.29
Jun 5, 2026Golumbeski GeorgedirectorGrant35,500—
Jun 5, 2026Golumbeski GeorgedirectorGrant53,250$2.29
Jun 5, 2026Stoppel LauradirectorGrant35,500—
Jun 5, 2026Stoppel LauradirectorGrant53,250$2.29
Jun 5, 2026Porter DerrelldirectorGrant35,500—
Jun 5, 2026RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: Grant35,500—
Jun 5, 2026RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: Grant53,250$2.29
Jun 5, 2026Fountain Nathan BdirectorGrant35,500—
Jun 5, 2026Fountain Nathan BdirectorGrant53,250$2.29
Jun 5, 2026Drapkin Kimberlee CdirectorGrant35,500—
Jun 5, 2026Drapkin Kimberlee CdirectorGrant53,250$2.29
Jun 5, 2026Stalfort John A IIIdirectorGrant35,500—
Jun 5, 2026Stalfort John A IIIdirectorGrant53,250$2.29
Mar 18, 2026RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: Grant6,060,606$3.30
Mar 10, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecOption2,090$1.85
Mar 10, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecSell2,090$3.26
Mar 3, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecSell9,406$3.01
Mar 3, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecOption9,406$1.85
Jan 28, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecSell2,671$3.00
Jan 28, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecSell15,085$3.00
Jan 28, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecOption2,671$1.85
Jan 28, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecOption15,085$1.85
Jan 23, 2026OConnell Daniel Josephdirector, officer: Chief Executive OfficerSell9,346$1.81
Jan 23, 2026OConnell Daniel Josephdirector, officer: Chief Executive OfficerSell2,689$1.88
Jan 23, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecSell1,054$1.84
Jan 23, 2026Meisner Derek Mofficer: Chief Legal Officer & Corp SecSell2,247$1.81

Source: ABOS SEC Form 4 filings, latest Jun 10, 2026. For informational purposes only — not investment advice.

Institutional activity (13F)

How institutions changed their ABOS positions over the last 6 months (SEC Form 13F).

Increased
54
New positions
26
Reduced
34
Sold out
14
Largest moves
InstitutionActionSharesFiled
RA CAPITAL MANAGEMENT, L.P.Increased21.0MMay 15, 2026
RA CAPITAL MANAGEMENT, L.P.Unchanged14.9MFeb 17, 2026
SANDS CAPITAL VENTURES, LLCIncreased3.7MMay 8, 2026
SANDS CAPITAL VENTURES, LLCUnchanged3.4MFeb 13, 2026
ALYESKA INVESTMENT GROUP, L.P.Increased2.5MMay 15, 2026
FRANKLIN RESOURCES INCUnchanged2.3MMay 13, 2026
FRANKLIN RESOURCES INCUnchanged2.3MFeb 11, 2026
ADAR1 CAPITAL MANAGEMENT, LLCIncreased2.2MMay 18, 2026
FMR LLCReduced2.0MFeb 17, 2026
VANGUARD GROUP INCIncreased1.7MJan 29, 2026
KNOLLWOOD INVESTMENT ADVISORY, LLCUnchanged1.6MMay 14, 2026
KNOLLWOOD INVESTMENT ADVISORY, LLCUnchanged1.6MFeb 13, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position1.5MMay 15, 2026
FMR LLCReduced1.2MMay 15, 2026
IKARIAN CAPITAL, LLCIncreased1.1MMay 15, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.

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