Dyne Therapeutics's three largest insider shareholders as of June 18, 2026 are Venture Fund Xi, L.P. Atlas (TenPercentOwner, 7.33Mn shares), Venture Fund Xi, L.P. Atlas (TenPercentOwner, 6.56Mn shares), Dirk Kersten (Director, 4.20Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Brian S Posner | - | 15,500 | 0 | 01 Apr, 2026 |
| John Cox | Ceo President | 374,145 | 0 | 06 Mar, 2026 |
| Joshua T Brumm | Ceo President | 537,998 | 0 | 12 Mar, 2024 |
| Jason P Rhodes | - | 0 | 1,958,427 | 29 Jan, 2025 |
| Susanna Gatti High | Chief Operating Officer | 131,636 | 0 | 19 Sep, 2024 |
| Erick Lucera | Chief Financial Officer | 125,373 | 0 | 03 Apr, 2026 |
| Venture Fund Xi, L.P. Atlas | - | 7,326,117 | 0 | 15 Jul, 2021 |
| Venture Opportunity Fund I, L.P. Atlas | - | 1,458,691 | 847,388 | 05 Mar, 2024 |
| Richard William Scalzo | Svp, Head Of Finance Admin. | 122,330 | 0 | 13 Mar, 2025 |
| Douglas Kerr | Chief Medical Officer | 171,606 | 0 | 06 Mar, 2026 |
| Dirk Kersten | - | 0 | 4,196,573 | 23 Apr, 2026 |
| Oxana Beskrovnaya | Chief Scientific Officer | 195,840 | 0 | 13 Mar, 2025 |
| Jonathan Mcneill | Chief Business Officer | 132,106 | 0 | 20 Aug, 2024 |
| Wildon Farwell | Chief Medical Officer | 143,222 | 0 | 20 Aug, 2024 |
| Venture Opportunity Fund Ii, L.P. Atlas | - | 934,581 | 0 | 14 Dec, 2022 |
| Johanna Friedl-Naderer | Chief Commercial Officer | 154,581 | 0 | 06 Mar, 2026 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 21 Apr, 2026 | Dirk Kersten | Common Stock | D | 8,300 | $20.01 | 4,199,225 | I | S |
| 21 Apr, 2026 | Dirk Kersten | Common Stock | D | 8,300 | $20.01 | 4,199,225 | I | S |
| 22 Apr, 2026 | Dirk Kersten | Common Stock | D | 2,652 | $20.00 | 4,196,573 | I | S |
| 22 Apr, 2026 | Dirk Kersten | Common Stock | D | 2,652 | $20.00 | 4,196,573 | I | S |
| 20 Apr, 2026 | Jason P Rhodes | Common Stock | D | 71,676 | $20.06 | 1,886,751 | I | S |
| 20 Apr, 2026 | Jason P Rhodes | Common Stock | D | 142,604 | $20.06 | 5,554,904 | I | S |
| 20 Apr, 2026 | Jason P Rhodes | Common Stock | D | 1,401 | $20.06 | 14,561 | I | S |
| 20 Apr, 2026 | Jason P Rhodes | Common Stock | D | 56,368 | $20.06 | 1,402,200 | I | S |
| 21 Apr, 2026 | Jason P Rhodes | Common Stock | D | 71,499 | $19.51 | 1,815,252 | I | S |
| 21 Apr, 2026 | Jason P Rhodes | Common Stock | D | 142,253 | $19.51 | 5,412,651 | I | S |
| 21 Apr, 2026 | Jason P Rhodes | Common Stock | D | 1,398 | $19.51 | 13,163 | I | S |
| 21 Apr, 2026 | Jason P Rhodes | Common Stock | D | 56,228 | $19.51 | 1,345,972 | I | S |
| 21 Apr, 2026 | Jason P Rhodes | Common Stock | D | 769 | $20.05 | 1,814,483 | I | S |
| 21 Apr, 2026 | Jason P Rhodes | Common Stock | D | 1,530 | $20.05 | 5,411,121 | I | S |
| 21 Apr, 2026 | Jason P Rhodes | Common Stock | D | 15 | $20.05 | 13,148 | I | S |
| 21 Apr, 2026 | Jason P Rhodes | Common Stock | D | 605 | $20.05 | 1,345,367 | I | S |
| 22 Apr, 2026 | Jason P Rhodes | Common Stock | D | 75,866 | $19.68 | 1,738,617 | I | S |
| 22 Apr, 2026 | Jason P Rhodes | Common Stock | D | 150,942 | $19.68 | 5,260,179 | I | S |
| 22 Apr, 2026 | Jason P Rhodes | Common Stock | D | 1,485 | $19.68 | 11,663 | I | S |
| 22 Apr, 2026 | Jason P Rhodes | Common Stock | D | 59,663 | $19.68 | 1,285,704 | I | S |