13F Insight
DOSSIER · 13F Holders · Q1 2026Most-boughtAI cap-ex
ABOS

ACUMEN PHARMACEUTICALS INC

87 institutions still hold ACUMEN PHARMACEUTICALS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 00509G209·87 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 7.9%
vs prior quarter
13F value held
$98M
60.0% inst. owned
of float
Holders
87
+11 QoQ
filers reporting
Activity
+14 / −6
+823 added · −701 reduced
this quarter
Concentration
50.54%
RA CAPITAL MANAGEMENT, L.P. #1
top holder share
AI Holders Summary · Q1 2026

87 institutions reported ABOS in Q1 2026. RA CAPITAL MANAGEMENT, L.P. leads at 50.5% of the visible book. +11 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
RA CAPITAL MANAGEMENT, L.P.
CIK 0001346824
$50M21.0M0.52%Q1 202602
Sands Capital Alternatives, LLC
CIK 0001846444
$9M3.7M2.08%Q1 202603
FRANKLIN RESOURCES INC
CIK 0000038777
$5M2.3M0.00%Q1 202604
ADAR1 Capital Management, LLC
CIK 0001940272
$5M2.2M0.30%Q1 202605
Knollwood Investment Advisory, LLC
CIK 0001999346
$4M1.6M0.39%Q1 202606
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$4M1.5M0.00%Q1 202607
FMR LLC
CIK 0000315066
$3M1.2M0.00%Q1 202608
Ikarian Capital, LLC
CIK 0001778253
$2M1.1M0.20%Q1 202609
Hudson Bay Capital Management LP
CIK 0001393825
$2M969K0.01%Q1 202610
Pathstone Holdings, LLC
CIK 0002011612
$2M859K0.01%Q1 202611
Alyeska Investment Group, L.P.
CIK 0001453072
$2M940K0.01%Q4 202512
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$2M713K0.00%Q1 202613
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$2M660K0.00%Q1 202614
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$1M531K0.00%Q1 202615
Laurion Capital Management LP
CIK 0001390202
$1M525K0.05%Q1 202616
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$1M474K0.00%Q1 202617
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$982,755416K0.00%Q1 202618
TWO SIGMA ADVISERS, LP
CIK 0001478735
$889,998422K0.00%Q4 202519
CITADEL ADVISORS LLC
CIK 0001423053
$785,095372K0.00%Q4 202520
BANK OF AMERICA CORP /DE/
CIK 0000070858
$755,710320K0.00%Q1 2026
Page 1 of 5
67 more holders available. Log in →