HOWL · Werewolf Therapeutics, Inc. · Shareholders & Ownership
Substantial doubt about the company's ability to continue as a going concern.
“We believe there is substantial doubt about our ability to continue as a going concern for at least twelve months from the date that these condensed consolidated financial statements are issued in this Quarterly Report. We are currently evaluating strategies to raise additional capital, however, there can be no assurances that we will be successful in mitigating the conditions which raise substantial doubt about our ability to continue as a going concern in the near term, if at all.”View the 10-Q filed Jul 31, 2026
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 | As of | Notes |
|---|---|---|---|---|
| 1 |
|
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 |
|
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 |
|
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 |
|
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 |
|
792,254 | ||
| 11.1 |
|
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 |
|
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 |
|
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 |
|
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 |
|
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.
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