Form 4 for HOWL Werewolf Therapeutics, Inc.
Accepted 2026-06-03 18:42:50 ET · period of report 2026-06-01 · accession 0001134657-26-000016 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MTI | 2026-06-03 18:42 | 2026-06-01+ | HOWL | EVNIN LUKE | Dir | S - Sale | $0.4551 | -139.8K | 482.8K | -22% | -$63.6K |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-06-01 | S | D | 80,459 | $0.47 | 542,120 | I See Footnotes | — | — | (F1) Transaction effected pursuant to a plan established pursuant to Rule 10b5-1 dated March 26, 2026. (F2) The shares were sold as follows: 8,620 by MPM Asset Management LLC ("AM LLC"), 54,428 by MPM BioVentures 2014, L.P. ("BV 2014"), 3,630 by MPM BIoVentures 2014(B), L.P. ("BV 2014(B)"), 1,873 by MPM Asset Management Investors BV2014 LLC ("AM BV2014") and 11,908 by MPM Oncology Innovations Fund, L.P. ("MPM OIF"). (F3) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.45 to $0.495 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. (F4) MPM BioVentures 2014 GP LLC and MPM BioVentures 2014 LLC ("BV LLC") are the direct and indirect general partners of BV 2014 and BV 2014(B). BV LLC is the manager of AM BV2014. MPM Oncology Innovations Fund GP LLC ("MPM OIF GP") is the general partner of MPM OIF. Luke Evnin is a member of AM LLC, a Managing Director of BV LLC and a manager of MPM OIF GP. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein. (F5) The shares are held as follows: 58,081 by AM LLC, 366,727 by BV 2014, 24,458 by BV 2014(B), 12,620 by AM BV2014 and 80,234 by MPM OIF. |
| 2 | Common | Common Stock | 2026-06-02 | S | D | 29,595 | $0.45 | 512,525 | I See Footnotes | — | — | (F1) Transaction effected pursuant to a plan established pursuant to Rule 10b5-1 dated March 26, 2026. (F6) The shares were sold as follows: 3,171 by AM LLC, 20,020 by BV 2014, 1,335 by BV 2014(B), 689 by AM BV2014 and 4,380 by MPM OIF. (F7) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.4304 to $0.46 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. (F4) MPM BioVentures 2014 GP LLC and MPM BioVentures 2014 LLC ("BV LLC") are the direct and indirect general partners of BV 2014 and BV 2014(B). BV LLC is the manager of AM BV2014. MPM Oncology Innovations Fund GP LLC ("MPM OIF GP") is the general partner of MPM OIF. Luke Evnin is a member of AM LLC, a Managing Director of BV LLC and a manager of MPM OIF GP. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein. (F8) The shares are held as follows: 54,910 by AM LLC, 346,707 by BV 2014, 23,123 by BV 2014(B), 11,931 by AM BV2014 and 75,854 by MPM OIF. |
| 3 | Common | Common Stock | 2026-06-03 | S | D | 29,749 | $0.42 | 482,776 | I See Footnotes | — | — | (F1) Transaction effected pursuant to a plan established pursuant to Rule 10b5-1 dated March 26, 2026. (F9) The shares were sold as follows: 3,187 by AM LLC, 20,124 by BV 2014, 1,342 by BV 2014(B), 693 by AM BV2014 and 4,403 by MPM OIF. (F10) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.42 to $0.4367 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. (F4) MPM BioVentures 2014 GP LLC and MPM BioVentures 2014 LLC ("BV LLC") are the direct and indirect general partners of BV 2014 and BV 2014(B). BV LLC is the manager of AM BV2014. MPM Oncology Innovations Fund GP LLC ("MPM OIF GP") is the general partner of MPM OIF. Luke Evnin is a member of AM LLC, a Managing Director of BV LLC and a manager of MPM OIF GP. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein. (F11) The shares are held as follows: 51,723 by AM LLC, 326,583 by BV 2014, 21,781 by BV 2014(B), 11,238 by AM BV2014 and 71,451 by MPM OIF. |