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.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
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Dyne Therapeutics Inc. May 22, 2024100.0%
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 |
|---|---|---|---|---|---|
| Sep 8, 2026 | Dyne Therapeutics Inc. | Open-market sale | −5,658 | $18.88 | $106,823 |
| Aug 13, 2026 | Dyne Therapeutics Inc. | Open-market sale | −4,986 | $26.28 | $131,032 |
| 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 |
Questions about John Cox
What boards is John Cox on?
John Cox sits on the board of Dyne Therapeutics Inc.
What company is John Cox the CEO of?
John Cox has been CEO & President of Dyne Therapeutics Inc. since March 2024.
How long has John Cox served on boards?
Our records show at least 3 years of board service across 1 board, the earliest from 2024.
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