Cox John (CIK 1498428) reported 13 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-06-17). Recent activity: Sell DYN (2,683 shares), Sell DYN (3,311 shares), Sell DYN (2,732 shares), Buy DYN (180,000 shares), Sell DYN (2,662 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-17 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 2,683 | $49,179 |
| 2026-05-14 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 3,311 | $60,790 |
| 2026-03-06 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 2,732 | $40,707 |
| 2026-02-17 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Buy | 180,000 | $0 |
| 2025-12-05 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 2,662 | $55,157 |
| 2025-09-09 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 2,640 | $35,402 |
| 2025-07-15 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Buy | 100,000 | $911,000 |
| 2025-07-15 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 10,000 | $0 |
| 2025-07-15 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 10,000 | $0 |
| 2025-07-15 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 10,000 | $0 |
| 2025-07-15 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 10,000 | $0 |
| 2025-06-06 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 4,060 | $54,201 |
| 2025-03-07 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 4,061 | $48,042 |
Source: SEC Form 4 filings · as of 2026-06-17