Werewolf Therapeutics, Inc.
HOWL- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001785530
In the last 90 days, Werewolf Therapeutics, Inc. insiders filed 0 open-market purchases and 1 sale; 45 institutions reported holding it in 13F filings for Q2 2026, worth $3.91M in total; no superinvestor holds it.
Holders of 5% or more of HOWL
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Werewolf Therapeutics, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Ra Capital Management, L.P. | 13D/A | 6.00%2.92M shares | −1.50 ppfrom 7.50% | May 14, 20256 filings | Jun 26, 2026 | SEC |
| Moll Peter | 13G | 5.20%2.54M shares | New | Sep 21, 20261 filing | Sep 21, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
17 Schedule 13D and 13G filings on Werewolf Therapeutics, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Sep 21, 202611:11 AM ET | Moll Peter | 13G | 5.20%2.54M shares | New | Sep 18, 2026 | SEC |
| Jun 26, 20265:39 PM ET | Ra Capital Management, L.P.and 3 others | 13D/A | 6.00%2.92M shares | −1.50 ppfrom 7.50% | Jun 24, 2026 | SEC |
| Jun 22, 20267:02 PM ET | Ra Capital Management, L.P.and 3 others | 13D/A | 7.50%3.65M shares | −3.10 ppfrom 10.60% | Jun 17, 2026 | SEC |
| Jun 15, 20268:16 PM ET | Ra Capital Management, L.P.and 3 others | 13D/A | 10.60%5.14M shares | −2.00 ppfrom 12.60% | Jun 11, 2026 | SEC |
| May 14, 20265:23 PM ET | Ra Capital Management, L.P.and 3 others | 13D/A | 12.60%6.12M shares | −1.20 ppfrom 13.80% | May 12, 2026 | SEC |
| May 12, 20267:56 PM ET | MPM BioVentures 2014, L.P.and 13 others | 13D/A | 3.80%1.83M shares | −1.60 ppfrom 5.40%Below 5% | May 8, 2026 | SEC |
| May 5, 20267:04 PM ET | MPM BioVentures 2014, L.P.and 13 others | 13D/A | 5.40%2.61M shares | −1.50 ppfrom 6.90% | May 1, 2026 | SEC |
| Feb 11, 20263:46 PM ET | Longwood Fund III, L.P.and 1 other | 13G/A | 3.50%1.68M shares | –Below 5% | Dec 31, 2025 | SEC |
| Jan 16, 20265:36 PM ET | MPM BioVentures 2014, L.P.and 13 others | 13D/A | 6.90%3.37M shares | −1.30 ppfrom 8.20% | Jan 14, 2026 | SEC |
| Dec 29, 20256:59 PM ET | MPM BioVentures 2014, L.P.and 13 others | 13D/A | 8.20%3.98M shares | −1.80 ppfrom 10.00% | Dec 22, 2025 | SEC |
| Dec 3, 20257:04 PM ET | MPM BioVentures 2014, L.P.and 13 others | 13D/A | 10.00%4.87M shares | −1.30 ppfrom 11.30% | Dec 1, 2025 | SEC |
| Nov 17, 20258:00 PM ET | MPM BioVentures 2014, L.P.and 13 others | 13D/A | 11.30%5.48M shares | −2.10 ppfrom 13.40% | Nov 13, 2025 | SEC |
| Nov 6, 20254:29 PM ET | Ra Capital Management, L.P.and 3 others | 13D/A | 13.80%6.68M shares | −1.20 ppfrom 15.00% | Nov 4, 2025 | SEC |
| Nov 4, 20256:33 PM ET | MPM BioVentures 2014, L.P.and 13 others | 13D/A | 13.40%6.15M shares | – | Oct 31, 2025 | SEC |
| Aug 14, 20254:48 PM ET | PFM Health Sciences, LPand 3 others | 13G/A | 0.90%401.1K shares | −5.60 ppfrom 6.50%Below 5% | Jun 30, 2025 | SEC |
| May 14, 20256:09 PM ET | Ra Capital Management, L.P.and 3 others | 13D/A | 15.00%6.75M shares | – | May 12, 2025 | SEC |
| Feb 14, 20254:07 PM ET | PFM Health Sciences, LPand 3 others | 13G/A | 6.50%2.91M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Werewolf Therapeutics, Inc. shares.
No Form 144 notices for Werewolf Therapeutics, Inc. are on file.