13F Insight
DOSSIER · 13F Holders · Q3 2025BellwetherCompounder
HOWL

WEREWOLF THERAPEUTICS INC

49 institutions still hold WEREWOLF THERAPEUTICS INC as of Q3 2025. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 95075A107·49 13F holders·last filed Sep 30, 2025
Market cap
—
▲ 8.1%
vs prior quarter
13F value held
$19M
69.0% inst. owned
of float
Holders
49
-35 QoQ
filers reporting
Activity
+64 / −72
+935 added · −875 reduced
this quarter
Concentration
43.57%
MPM ASSET MANAGEMENT LLC #1
top holder share
AI Holders Summary · Q3 2025

49 institutions reported HOWL in Q3 2025. MPM ASSET MANAGEMENT LLC leads at 43.6% of the visible book. -35 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
MPM ASSET MANAGEMENT LLC
CIK 0001263048
$8M4.3M19.96%Q3 202502
RA CAPITAL MANAGEMENT, L.P.
CIK 0001346824
$6M6.7M0.06%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$1M1.2M0.00%Q1 202604
MPM BioImpact LLC
CIK 0001687078
$1M1.2M0.08%Q1 202605
Lynx1 Capital Management LP
CIK 0001910456
$547,673658K0.09%Q1 202606
SPHERA FUNDS MANAGEMENT LTD.
CIK 0001496201
$521,882627K0.08%Q1 202607
DC Funds, LP
CIK 0001869028
$490,486589K33.01%Q1 202608
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$429,803516K0.00%Q1 202609
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$324,363389K0.00%Q1 202610
BANK OF AMERICA CORP /DE/
CIK 0000070858
$220,133265K0.00%Q1 202611
Alyeska Investment Group, L.P.
CIK 0001453072
$149,319236K0.00%Q4 202512
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$131,386158K0.00%Q1 202613
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$109,945132K0.00%Q1 202614
STATE STREET CORP
CIK 0000093751
$99,219119K0.00%Q1 202615
BlackRock, Inc.
CIK 0002012383
$84,598102K0.00%Q1 202616
NORTHERN TRUST CORP
CIK 0000073124· Index
$72,31287K0.00%Q1 202617
JANE STREET GROUP, LLC
CIK 0001595888· Market maker
$68,96983K0.00%Q1 202618
BRIDGEWAY CAPITAL MANAGEMENT, LLC
CIK 0001107261
$64,11077K0.00%Q1 202619
UBS Group AG
CIK 0001610520
$55,69267K0.00%Q1 202620
XTX Topco Ltd
CIK 0001828301
$42,40351K0.00%Q1 2026
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