🕵️ Werewolf Therapeutics, Inc. ($HOWL)
SEC insider & ownership activity, last 12 months · CIK 1785530 · every row links its SEC filing
Over the last 12 months insiders sold $8.7M with no open-market buying against it. Evnin Luke sold $3.3M through a 10b5-1 trading plan in 87 lots (Oct–Jul). 2 red-flag 8-Ks in the window, most recently Delisting notice (3.01), Feb 4, 2026.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 4 sellers, $8.7M (163 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Evnin Luke | 0 | – | 87 | $3.3M | Jul 7, 2026 |
| MPM Bioventures 2014, L.P. | 0 | – | 28 | $2.2M | Dec 4, 2025 |
| Ansbert Gadicke | 0 | – | 28 | $2.2M | Dec 4, 2025 |
| RA Capital Management, L.P. | 0 | – | 20 | $964K | Jun 17, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| RA Capital Management, L.P. | exited | 13D | Jun 30, 2026 | filing ↗ | |
| Peter Kolchinsky | exited | 13D | Jun 30, 2026 | filing ↗ | |
| Rajeev Shah | exited | 13D | Jun 30, 2026 | filing ↗ | |
| RA Capital Healthcare Fund, L.P. | exited | 13D | Jun 30, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| MPM Oncology Innovations Fund, L.P. | $7K | Jul 6, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $1K | Jul 6, 2026 | filing ↗ |
| MPM Asset Management LLC | $5K | Jul 6, 2026 | filing ↗ |
| UBS Oncology Impact Fund, L.P. | $27K | Jul 6, 2026 | filing ↗ |
| MPM Bioventures 2014 (B), L.P. | $2K | Jul 6, 2026 | filing ↗ |
| MPM Bioventures 2014, L.P. | $33K | Jul 6, 2026 | filing ↗ |
| MPM Oncology Innovations Fund, L.P. | $8K | Jun 29, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $1K | Jun 29, 2026 | filing ↗ |
| MPM Asset Management LLC | $5K | Jun 29, 2026 | filing ↗ |
| UBS Oncology Impact Fund, L.P. | $28K | Jun 29, 2026 | filing ↗ |
| MPM Bioventures 2014 (B), L.P. | $2K | Jun 29, 2026 | filing ↗ |
| MPM Bioventures 2014, L.P. | $34K | Jun 29, 2026 | filing ↗ |
| MPM Bioventures 2014, L.P. | $120K | May 28, 2026 | filing ↗ |
| MPM Bioventures 2014 (B), L.P. | $8K | May 28, 2026 | filing ↗ |
| UBS Oncology Impact Fund, L.P. | $99K | May 28, 2026 | filing ↗ |
| MPM Asset Management LLC | $19K | May 28, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $4K | May 28, 2026 | filing ↗ |
| MPM Oncology Innovations Fund, L.P. | $26K | May 28, 2026 | filing ↗ |
| MPM Oncology Innovations Fund, L.P. | $33K | May 18, 2026 | filing ↗ |
| MPM Bioventures 2014, L.P. | $150K | May 18, 2026 | filing ↗ |
| MPM Bioventures 2014 (B), L.P. | $10K | May 18, 2026 | filing ↗ |
| UBS Oncology Impact Fund, L.P. | $124K | May 18, 2026 | filing ↗ |
| MPM Asset Management LLC | $24K | May 18, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $5K | May 18, 2026 | filing ↗ |
| MPM Oncology Innovations Fund, L.P. | $13K | May 11, 2026 | filing ↗ |
| MPM Asset Management LLC | $9K | May 11, 2026 | filing ↗ |
| MPM Bioventures 2014, L.P. | $57K | May 11, 2026 | filing ↗ |
| MPM Bioventures 2014 (B), L.P. | $4K | May 11, 2026 | filing ↗ |
| UBS Oncology Impact Fund, L.P. | $48K | May 11, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $2K | May 11, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $9K | May 1, 2026 | filing ↗ |
| UBS Oncology Impact Fund, L.P. | $216K | May 1, 2026 | filing ↗ |
| MPM Bioventures 2014 (B), L.P. | $17K | May 1, 2026 | filing ↗ |
| MPM Bioventures 2014, L.P. | $262K | May 1, 2026 | filing ↗ |
| MPM Oncology Innovations Fund, L.P. | $57K | May 1, 2026 | filing ↗ |
| MPM Asset Management LLC | $41K | May 1, 2026 | filing ↗ |
| MPM Asset Management LLC | $15K | Apr 29, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $3K | Apr 29, 2026 | filing ↗ |
| UBS Oncology Impact Fund, L.P. | $80K | Apr 29, 2026 | filing ↗ |
| MPM Bioventures 2014 (B), L.P. | $6K | Apr 29, 2026 | filing ↗ |
| MPM Bioventures 2014, L.P. | $96K | Apr 29, 2026 | filing ↗ |
| MPM Oncology Innovations Fund, L.P. | $21K | Apr 29, 2026 | filing ↗ |
| MPM Asset Management LLC | $17K | Apr 27, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $4K | Apr 27, 2026 | filing ↗ |
| MPM Bioventures 2014 (B), L.P. | $7K | Apr 27, 2026 | filing ↗ |
| UBS Oncology Impact Fund, L.P. | $88K | Apr 27, 2026 | filing ↗ |
| MPM Bioventures 2014, L.P. | $106K | Apr 27, 2026 | filing ↗ |
| MPM Oncology Innovations Fund, L.P. | $23K | Apr 27, 2026 | filing ↗ |
| MPM Asset Management LLC | $20K | Jan 6, 2026 | filing ↗ |
| MPM Asset Management Investors BV2014 LLC | $4K | Jan 6, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Earnings (2.02) | Mar 27, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 27, 2026 | filing ↗ |
| Other events (8.01) | Feb 24, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 24, 2026 | filing ↗ |
| Exit or disposal costs (2.05) | Feb 9, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 9, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 9, 2026 | filing ↗ |
| Delisting notice (3.01) | Feb 4, 2026 | filing ↗ |
| Other events (8.01) | Dec 18, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 18, 2025 | filing ↗ |
| Earnings (2.02) | Nov 4, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 4, 2025 | filing ↗ |
| Delisting notice (3.01) | Oct 2, 2025 | filing ↗ |
| Earnings (2.02) | Aug 14, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 14, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 14, 2025 | filing ↗ |