Cox John (CIK 1498428) reported 14 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-09-08). Recent activity: Sell DYN (5,658 shares), Sell DYN (4,986 shares), Sell DYN (2,683 shares), Sell DYN (3,311 shares), Sell DYN (2,732 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-08 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 5,658 | $106,823 |
| 2026-08-17 | Dyne Therapeutics, Inc. (DYN) | CEO & President | Sell | 4,986 | $131,032 |
| 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 |
来源：SEC Form 4 申报文件 · 截至 2026-09-08