Data spanning the past 90 days through December 12, 2025 reveals that Dyne Therapeutics's three principal insider shareholders consist of CEO & President John Cox (214.88K shares), Chief Operating Officer Susanna Gatti High (131.64K shares), Chief Commercial Officer Johanna Friedl-Naderer (94.73K 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 | Johanna Friedl-Naderer | Common Stock | D | 144 | $20.72 | 94,729 | D | S |
| 05 Dec, 2025 | Douglas Kerr | Common Stock | D | 880 | $20.72 | 87,510 | D | S |
| 05 Dec, 2025 | John Cox | Common Stock | D | 2,662 | $20.72 | 196,877 | D | S |
| 05 Sep, 2025 | John Cox | Common Stock | D | 2,640 | $13.41 | 199,539 | D | S |
| 04 Sep, 2025 | Johanna Friedl-Naderer | Common Stock | D | 894 | $13.27 | 95,017 | D | S |
| 04 Sep, 2025 | Douglas Kerr | Common Stock | D | 3,552 | $13.27 | 89,263 | 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 |
| 14 Jul, 2025 | John Cox | Common Stock | A | 100,000 | $9.11 | 242,179 | D | P |
| 15 Jul, 2025 | John Cox | Common Stock | D | 10,000 | $0.00 | 232,179 | D | G |
| 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 | 222,179 | D | G |
| 15 Jul, 2025 | John Cox | Common Stock | D | 10,000 | $0.00 | 18,000 | I | G |
| 05 Jun, 2025 | Douglas Kerr | Common Stock | D | 1,342 | $13.35 | 92,815 | D | S |
| 05 Jun, 2025 | John Cox | Common Stock | D | 4,060 | $13.35 | 142,179 | D | S |
| 05 Jun, 2025 | Johanna Friedl-Naderer | Common Stock | D | 146 | $13.35 | 95,911 | D | S |
| 31 Mar, 2025 | Erick Lucera | - | - | 66,100 | D | |||
| 31 Mar, 2025 | Erick Lucera | Common Stock | A | 66,100 | $0.00 | 66,100 | D | A |
| 13 Mar, 2025 | Johanna Friedl-Naderer | Common Stock | D | 143 | $12.12 | 96,057 | D | S |
| 11 Mar, 2025 | Richard William Scalzo | Common Stock | D | 1,343 | $11.38 | 122,330 | D | S |