John Cox
See Remarks at Dyne Therapeutics Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 3 years
- Director since
- 2024
3 years of board service in total across 1 board, counting each seat separately. Longest: Dyne Therapeutics Inc., 2 years.
Dyne Therapeutics Inc.
Director · CEO & President
Chief executive roles
Dyne Therapeutics Inc.
· CEO & President
Since March 2024
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Jun 16, 2026 | Dyne Therapeutics Inc. | Open-market sale | −2,683 | $18.33 | $49,179 |
| May 13, 2026 | Dyne Therapeutics Inc. | Open-market sale | −3,311 | $18.36 | $60,790 |
| Mar 5, 2026 | Dyne Therapeutics Inc. | Open-market sale | −2,732 | $14.90 | $40,707 |
| Feb 12, 2026 | Dyne Therapeutics Inc. | Grant or award | +180,000 | — | — |
| Dec 5, 2025 | Dyne Therapeutics Inc. | Open-market sale | −2,662 | $20.72 | $55,157 |
| Sep 5, 2025 | Dyne Therapeutics Inc. | Open-market sale | −2,640 | $13.41 | $35,402 |
| Jul 15, 2025 | Dyne Therapeutics Inc. | Gift | −10,000 | — | — |
| Jul 15, 2025 | Dyne Therapeutics Inc. | Gift | −10,000 | — | — |
| Jul 15, 2025 | Dyne Therapeutics Inc. | Gift | −10,000 | — | — |
| Jul 15, 2025 | Dyne Therapeutics Inc. | Gift | −10,000 | — | — |
| Jul 14, 2025 | Dyne Therapeutics Inc. | Open-market purchase | +100,000 | $9.11 | $911,000 |
| Jun 5, 2025 | Dyne Therapeutics Inc. | Open-market sale | −4,060 | $13.35 | $54,201 |
| Mar 5, 2025 | Dyne Therapeutics Inc. | Open-market sale | −4,061 | $11.83 | $48,042 |
| Dec 4, 2024 | Dyne Therapeutics Inc. | Grant or award | +145,300 | — | — |
| Sep 4, 2024 | Dyne Therapeutics Inc. | Open-market purchase | +800 | $32.57 | $26,056 |
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