According to recent filings covering the 90 days ending February 07, 2026, the three most significant insider holders at Dyne Therapeutics are TenPercentOwner Venture Fund Xi, L.P. Atlas (6.56Mn shares), Director Dirk Kersten (5.40Mn shares), TenPercentOwner Venture Opportunity Fund I, L.P. Atlas (2.31Mn shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Venture Fund Xi, L.P. Atlas | 6,562,578 | 28 Feb, 2024 | |
| Dirk Kersten | 5,400,545 | 10 Dec, 2024 | |
| Venture Opportunity Fund I, L.P. Atlas | 2,306,079 | 05 Mar, 2024 | |
| Jason P Rhodes | 1,958,427 | 29 Jan, 2025 | |
| Venture Opportunity Fund Ii, L.P. Atlas | 934,581 | 14 Dec, 2022 | |
| Joshua T Brumm | Ceo & President | 537,998 | 12 Mar, 2024 |
| John Cox | Ceo & President | 214,877 | 05 Dec, 2025 |
| Oxana Beskrovnaya | Chief Scientific Officer | 195,840 | 13 Mar, 2025 |
| Wildon Farwell | Chief Medical Officer | 143,222 | 20 Aug, 2024 |
| Jonathan Mcneill | Chief Business Officer | 132,106 | 20 Aug, 2024 |
| Susanna Gatti High | Chief Operating Officer | 131,636 | 19 Sep, 2024 |
| Richard William Scalzo | Svp And Head Of Finance & Admin. | 122,330 | 13 Mar, 2025 |
| Johanna Friedl-Naderer | Chief Commercial Officer | 94,729 | 05 Dec, 2025 |
| Douglas Kerr | Chief Medical Officer | 87,510 | 05 Dec, 2025 |
| Erick Lucera | Chief Financial Officer | 66,100 | 01 Apr, 2025 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 05 Dec, 2025 | John Cox | Common Stock | D | 2,662 | $20.72 | 196,877 | D | S |
| 05 Dec, 2025 | Douglas Kerr | Common Stock | D | 880 | $20.72 | 87,510 | D | S |
| 05 Dec, 2025 | Johanna Friedl-Naderer | Common Stock | D | 144 | $20.72 | 94,729 | D | S |
| 05 Sep, 2025 | John Cox | Common Stock | D | 2,640 | $13.41 | 199,539 | D | S |
| 05 Sep, 2025 | Douglas Kerr | Common Stock | D | 873 | $13.41 | 88,390 | D | S |
| 05 Sep, 2025 | Johanna Friedl-Naderer | Common Stock | D | 144 | $13.41 | 94,873 | D | S |
| 04 Sep, 2025 | Douglas Kerr | Common Stock | D | 3,552 | $13.27 | 89,263 | D | S |
| 04 Sep, 2025 | Johanna Friedl-Naderer | Common Stock | D | 894 | $13.27 | 95,017 | D | S |
| 15 Jul, 2025 | John Cox | Common Stock | D | 10,000 | $0.00 | 18,000 | I | G |
| 15 Jul, 2025 | John Cox | - | - | 18,000 | I | |||
| 15 Jul, 2025 | John Cox | Common Stock | D | 10,000 | $0.00 | 18,000 | I | G |
| 15 Jul, 2025 | John Cox | Common Stock | D | 10,000 | $0.00 | 232,179 | D | G |
| 15 Jul, 2025 | John Cox | - | - | 18,000 | I | |||
| 15 Jul, 2025 | John Cox | Common Stock | D | 10,000 | $0.00 | 222,179 | D | G |
| 14 Jul, 2025 | John Cox | Common Stock | A | 100,000 | $9.11 | 242,179 | D | P |
| 05 Jun, 2025 | John Cox | Common Stock | D | 4,060 | $13.35 | 142,179 | D | S |
| 05 Jun, 2025 | Douglas Kerr | Common Stock | D | 1,342 | $13.35 | 92,815 | D | S |
| 05 Jun, 2025 | Johanna Friedl-Naderer | Common Stock | D | 146 | $13.35 | 95,911 | D | S |
| 31 Mar, 2025 | Erick Lucera | Common Stock | A | 66,100 | $0.00 | 66,100 | D | A |
| 31 Mar, 2025 | Erick Lucera | - | - | 66,100 | D |