WATERTOWN, MA
WEREWOLF THERAPEUTICS, INC.HOWL— Latest position per institution from SEC 13F filings
15
Institutional holders
26.55M
Total shares held
37.93M
Estimated value
1.33M
Avg. position size
RA CAPITAL MANAGEMENT, L.P.
CIK 1346824
Shares
6.68M
Value
5.56M
Filed
Mar 31, 2026
MPM ASSET MANAGEMENT LLC
CIK 1263048
Shares
4.31M
Value
8.49M
Filed
Sep 30, 2025
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 1165408
Shares
2M
Value
4.24M
Filed
Sep 30, 2024
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
1.59M
Value
3.87M
Filed
Jun 30, 2024
VANGUARD GROUP INC
CIK 102909
Shares
1.41M
Value
892.70K
Filed
Dec 31, 2025
RUBRIC CAPITAL MANAGEMENT LP
CIK 1687509
Shares
1.33M
Value
1.30M
Filed
Mar 31, 2025
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
1.22M
Value
1.01M
Filed
Mar 31, 2026
MPM BIOIMPACT LLC
CIK 1687078
Shares
1.21M
Value
1.01M
Filed
Mar 31, 2026
DEERFIELD MANAGEMENT COMPANY, L.P.
CIK 1009258
Shares
958.13K
Value
4.32K
Filed
Sep 30, 2022
MONASHEE INVESTMENT MANAGEMENT LLC
CIK 1627608
Shares
890K
Value
5.77M
Filed
Mar 31, 2024
EAGLE HEALTH INVESTMENTS LP
CIK 1842545
Shares
700K
Value
1.48M
Filed
Sep 30, 2024
LYNX1 CAPITAL MANAGEMENT LP
CIK 1910456
Shares
657.79K
Value
547.67K
Filed
Mar 31, 2026
SPHERA FUNDS MANAGEMENT LTD.
CIK 1496201
Shares
626.81K
Value
521.88K
Filed
Mar 31, 2026
DC FUNDS, LP
CIK 1869028
Shares
589.10K
Value
490.49K
Filed
Mar 31, 2026
SQUADRON CAPITAL MANAGEMENT LLC
CIK 2050709
Shares
563.53K
Value
469.20K
Filed
Mar 31, 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 1037389
Shares
516.22K
Value
429.80K
Filed
Mar 31, 2026
PFM HEALTH SCIENCES, LP
CIK 1442756
Shares
401.11K
Value
790.19K
Filed
Sep 30, 2025
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
389.49K
Value
324.36K
Filed
Mar 31, 2026
BANK OF AMERICA CORP /DE/
CIK 70858
Shares
264.58K
Value
220.13K
Filed
Mar 31, 2026
OASIS MANAGEMENT CO LTD.
CIK 1317904
Shares
246.31K
Value
504.93K
Filed
Dec 31, 2022
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | 1346824 | 6.68M | 5.56M | Mar 31, 2026 |
| 2 | MPM ASSET MANAGEMENT LLC | 1263048 | 4.31M | 8.49M | Sep 30, 2025 |
| 3 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1165408 | 2M | 4.24M | Sep 30, 2024 |
| 4 | BLACKROCK FINANCE, INC. | 1364742 | 1.59M | 3.87M | Jun 30, 2024 |
| 5 | VANGUARD GROUP INC | 102909 | 1.41M | 892.70K | Dec 31, 2025 |
| 6 | RUBRIC CAPITAL MANAGEMENT LP | 1687509 | 1.33M | 1.30M | Mar 31, 2025 |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 1.22M | 1.01M | Mar 31, 2026 |
| 8 | MPM BIOIMPACT LLC | 1687078 | 1.21M | 1.01M | Mar 31, 2026 |
| 9 | DEERFIELD MANAGEMENT COMPANY, L.P. | 1009258 | 958.13K | 4.32K | Sep 30, 2022 |
| 10 | MONASHEE INVESTMENT MANAGEMENT LLC | 1627608 | 890K | 5.77M | Mar 31, 2024 |
| 11 | EAGLE HEALTH INVESTMENTS LP | 1842545 | 700K | 1.48M | Sep 30, 2024 |
| 12 | LYNX1 CAPITAL MANAGEMENT LP | 1910456 | 657.79K | 547.67K | Mar 31, 2026 |
| 13 | SPHERA FUNDS MANAGEMENT LTD. | 1496201 | 626.81K | 521.88K | Mar 31, 2026 |
| 14 | DC FUNDS, LP | 1869028 | 589.10K | 490.49K | Mar 31, 2026 |
| 15 | SQUADRON CAPITAL MANAGEMENT LLC | 2050709 | 563.53K | 469.20K | Mar 31, 2026 |
| 16 | RENAISSANCE TECHNOLOGIES LLC | 1037389 | 516.22K | 429.80K | Mar 31, 2026 |
| 17 | PFM HEALTH SCIENCES, LP | 1442756 | 401.11K | 790.19K | Sep 30, 2025 |
| 18 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 389.49K | 324.36K | Mar 31, 2026 |
| 19 | BANK OF AMERICA CORP /DE/ | 70858 | 264.58K | 220.13K | Mar 31, 2026 |
| 20 | OASIS MANAGEMENT CO LTD. | 1317904 | 246.31K | 504.93K | Dec 31, 2022 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.