HOWL's three largest insider shareholders as of March 23, 2026 are Capital Management, L.P. Ra (Director, 6.24Mn shares), Ansbert Gadicke (Other, 4.78Mn shares), Bioventures 2014, L.P. Mpm (Other, 4.78Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Capital Management, L.P. Ra | 0 | 6,237,482 | 14 May, 2025 | |
| Ansbert Gadicke | 0 | 4,784,111 | 04 Dec, 2025 | |
| Bioventures 2014, L.P. Mpm | 0 | 4,784,111 | 04 Dec, 2025 | |
| Bioventures 2014, L.P. Mpm | 0 | 3,208,793 | 30 Apr, 2025 | |
| James E Flynn | 0 | 2,552,787 | 04 May, 2021 | |
| Luke Evnin | 0 | 2,159,860 | 20 Jan, 2026 | |
| Ventures Llc Taiho | 2,068,909 | 0 | 04 May, 2021 | |
| Bio Ventures 2 L.P. Arkin | 0 | 2,046,634 | 04 May, 2021 | |
| Fund Iii Gp, Llc Longwood | 0 | 1,677,082 | 04 May, 2021 | |
| Upmc | 1,097,756 | 0 | 04 May, 2021 | |
| Global Healthcare Management Lp Sphera | 0 | 787,997 | 04 May, 2021 | |
| Healthcare Investments (Cayman) Ltd. Hbm | 625,995 | 0 | 05 May, 2021 | |
| Cynthia Seidel-Dugan | Chief Scientific Officer | 164,888 | 0 | 14 Jan, 2022 |
| Reid Leonard | Chief Operating Officer | 0 | 122,157 | 17 Dec, 2021 |
| Reid Leonard | Chief Operating Officer | 14,102 | 0 | 04 Jan, 2022 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 16 Jan, 2026 | Luke Evnin | Common Stock | D | 38,782 | $0.54 | 2,159,860 | I | S |
| 13 Jan, 2026 | Luke Evnin | Common Stock | D | 43,198 | $0.55 | 2,266,671 | I | S |
| 14 Jan, 2026 | Luke Evnin | Common Stock | D | 30,616 | $0.57 | 2,236,055 | I | S |
| 15 Jan, 2026 | Luke Evnin | Common Stock | D | 37,413 | $0.55 | 2,198,642 | I | S |
| 08 Jan, 2026 | Luke Evnin | Common Stock | D | 7,716 | $0.63 | 2,393,527 | I | S |
| 09 Jan, 2026 | Luke Evnin | Common Stock | D | 24,678 | $0.61 | 2,368,849 | I | S |
| 12 Jan, 2026 | Luke Evnin | Common Stock | D | 58,980 | $0.57 | 2,309,869 | I | S |
| 05 Jan, 2026 | Luke Evnin | Common Stock | D | 18,378 | $0.64 | 2,453,919 | I | S |
| 06 Jan, 2026 | Luke Evnin | Common Stock | D | 40,761 | $0.65 | 2,413,158 | I | S |
| 07 Jan, 2026 | Luke Evnin | Common Stock | D | 11,915 | $0.64 | 2,401,243 | I | S |
| 30 Dec, 2025 | Luke Evnin | Common Stock | D | 34,847 | $0.61 | 2,515,827 | I | S |
| 31 Dec, 2025 | Luke Evnin | Common Stock | D | 24,962 | $0.62 | 2,490,865 | I | S |
| 02 Jan, 2026 | Luke Evnin | Common Stock | D | 18,568 | $0.63 | 2,472,297 | I | S |
| 22 Dec, 2025 | Luke Evnin | Common Stock | D | 59,307 | $0.69 | 2,782,650 | I | S |
| 23 Dec, 2025 | Luke Evnin | Common Stock | D | 71,428 | $0.63 | 2,711,222 | I | S |
| 24 Dec, 2025 | Luke Evnin | Common Stock | D | 16,310 | $0.65 | 2,694,912 | I | S |
| 26 Dec, 2025 | Luke Evnin | Common Stock | D | 35,632 | $0.63 | 2,659,280 | I | S |
| 29 Dec, 2025 | Luke Evnin | Common Stock | D | 108,606 | $0.61 | 2,550,674 | I | S |
| 15 Dec, 2025 | Luke Evnin | Common Stock | D | 23,640 | $1.07 | 2,866,488 | I | S |
| 16 Dec, 2025 | Luke Evnin | Common Stock | D | 14,548 | $1.05 | 2,851,940 | I | S |