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HOWL · Werewolf Therapeutics, Inc. · Shareholders & Ownership

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$1.10 +0.06 (+5.77%)
Market Cap
$50.54M
Shares
48.60M
Volume · Oct 20 484.16K Avg daily vol (3M) 6.69M

Every disclosed holder of HOWL in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns HOWL

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions
Holder group Shares % Out
Institutional (13F) 10,977,889 22.59%
Insiders (Forms 3, 4, 5) 5,284 0.01%
13D/G-only blocks 10,984,072 22.60%
Remaining 26,631,821 54.80%
Registered funds (N-PORT, not summed) 1,553,826 3.20%

Shares outstanding: 48,599,066, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of HOWL

# Holder Shares
1
GADICKE ANSBERT
Insider CIK 1134655 · Dec 4, 2025
Director, issuer-wide, not summed
4,784,111
2
ADAGE CAPITAL PARTNERS GP, L.L.C.
13G CIK 1165408 · Registered investment adviser · Dec 11, 2023
Rule 13d-1(c), passive investor
3,034,255
3
MOLL PETER
13G CIK 1732748 · Unknown · Sep 18, 2026
Rule 13d-1(d), exempt investor
2,537,138
4
RA CAPITAL MANAGEMENT, L.P.
13F CIK 1346824 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,387,744
4.1
RA CAPITAL MANAGEMENT, L.P.
13D CIK 1346824 · Registered investment adviser · Jun 30, 2026
Item 4 purpose: not restated by this amendment, the earlier 13D's purpose stands
not summed
1,985,541
4.2
RA CAPITAL MANAGEMENT, L.P.
Insider CIK 1346824 · Jun 17, 2026
Director, issuer-wide, not summed
303,719
5
Adage Capital Management, L.P.
13G CIK 1535978 · Investment adviser · Sep 30, 2024
Rule 13d-1(b), qualified institution
2,000,594
6
Balyasny Asset Management L.P.
13F CIK 1218710 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,790,089
7
Longwood Fund III GP, LLC
13G CIK 1640546 · Unknown · Dec 31, 2025
Rule 13d-1(c), passive investor
1,677,082
8
Rubric Capital Management LP
13G CIK 1687509 · Registered investment adviser · Sep 30, 2024
1,333,893
9
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,217,976
10
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
873,745
11
MPM BioVentures 2014, L.P.
13D CIK 1609492 · Unknown · May 8, 2026
not summed
792,254
11.1
MPM BioVentures 2014, L.P.
Insider CIK 1609492 · Dec 4, 2025
Insider, issuer-wide, not summed
4,784,111
12
RENAISSANCE TECHNOLOGIES LLC
13F CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
674,632
13
Lynx1 Capital Management LP
13F CIK 1910456 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
657,786
14
SPHERA FUNDS MANAGEMENT LTD.
13F CIK 1496201 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
626,810
15
DC Funds, LP
13F CIK 1869028 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
589,102
16
PFM Health Sciences, LP
13G CIK 1442756 · Registered investment adviser · Jun 30, 2025
Rule 13d-1(c), passive investor
401,110
17
Verdad Advisers, LP
13F CIK 1812822 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
348,709
18
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
344,231
19
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
335,815
20
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
311,502
21
XTX Topco Ltd
13F CIK 1828301 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
271,478
22
JANE STREET GROUP, LLC
13F CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
251,837
23
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
215,838
24
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
214,645
25
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
157,726
26
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
119,168
27
Squarepoint Ops LLC
13F CIK 1642575 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
103,242
28
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
101,573
29
Rangeley Capital, LLC
13F CIK 1517796 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
100,000
30
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
86,851
31
Alyeska Investment Group, L.P.
13F CIK 1453072 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
86,554
32
MPM BIOIMPACT LLC
13F CIK 1687078 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
80,142
33
MILLENNIUM MANAGEMENT LLC
13F CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
62,055
34
Vontobel Holding Ltd.
13F CIK 1588340 · Unknown · Sep 30, 2026
60,000
35
Fidelity Total Market Index Fund
Fund S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
54,577
36
Vilga Financial Planning LLC
13F CIK 2083456 · Unknown · Sep 30, 2026
53,423
37
Virtu Financial LLC
13F CIK 1533964 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
45,467
38
Fidelity Series Total Market Index Fund
Fund S000065248 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
42,628
39
TWO SIGMA INVESTMENTS, LP
13F CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
27,300
40
GSA CAPITAL PARTNERS LLP
13F CIK 1362033 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
27,146
41
Fidelity Nasdaq Composite Index Fund
Fund S000055366 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
23,347
42
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
20,023
43
StoneX Group Inc.
13F CIK 913760 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
20,000
44
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
19,108
45
CERTUITY, LLC
13F CIK 1800752 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
15,000
46
BARCLAYS PLC
13F CIK 312069 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
13,235
47
HBK Sorce Advisory LLC
13F CIK 1379995 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
13,227
48
Larson Financial Group LLC
13F CIK 1731061 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
13,052
49
LPL Financial LLC
13F CIK 1403438 · Broker-dealer · Jun 30, 2026
carried, not yet filed for the newest quarter
11,791
50
Ranch Capital Advisors Inc.
13F CIK 1793269 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
11,000

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 64 holders

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Key facts CIK 1785530 CUSIP 95075A107 13F (30d) 3 filings 3 filers Visit website Investor relations