John Cox, CEO and President of Dyne Therapeutics ($DYN), made one open market purchase of shares in the last year totaling $911,000, with his most recent buy on July 14, 2025. This ranks 608th among nearly 5,000 insiders, below the average of 1.5 million per buyer and 3.3 transactions. He conducted four open market sales totaling $185,000, most recently on March 5, 2026, ranking 8,573rd out of about 12,000 sellers versus their 8.6 million average and 6.4 transactions.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 5, 2026 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | S | Common Stock | 2732 | $14.90 | 446,145.0000 | 142,824,687 | 0.61% | 0.00% |
| Feb. 12, 2026 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | A | Stock option (right to buy) | 285000 | $0.00 | 285,000.0000 | 142,824,687 | 9999.99% | 0.20% |
| Feb. 12, 2026 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | A | Common Stock | 180000 | $0.00 | 448,877.0000 | 142,824,687 | 66.95% | 0.13% |
| Dec. 5, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | S | Common Stock | 2662 | $20.72 | 268,877.0000 | 142,824,687 | 0.98% | 0.00% |
| Sept. 5, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | S | Common Stock | 2640 | $13.41 | 271,539.0000 | 113,121,357 | 0.96% | 0.00% |
| July 16, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | A | Stock option (right to buy) | 197285 | $0.00 | 197,285.0000 | 113,121,357 | 9999.99% | 0.17% |
| July 15, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | G | Common Stock | 10000 | $0.00 | 274,179.0000 | 113,121,357 | 3.52% | 0.01% |
| July 14, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 100000 | $9.11 | 314,179.0000 | 113,121,357 | 46.69% | 0.09% |
| July 15, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | G | Common Stock | 10000 | $0.00 | 304,179.0000 | 113,121,357 | 3.18% | 0.01% |
| July 15, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | G | Common Stock | 10000 | $0.00 | 294,179.0000 | 113,121,357 | 3.29% | 0.01% |
| July 15, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | G | Common Stock | 10000 | $0.00 | 284,179.0000 | 113,121,357 | 3.40% | 0.01% |
| June 5, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | S | Common Stock | 4060 | $13.35 | 174,179.0000 | 113,121,357 | 2.28% | 0.00% |
| March 5, 2025 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | S | Common Stock | 4061 | $11.83 | 178,239.0000 | 113,121,357 | 2.23% | 0.00% |
| Dec. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | A | Stock option (right to buy) | 232100 | $0.00 | 232,100.0000 | 0 | 9999.99% | 0.00% |
| Dec. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | A | Common Stock | 145300 | $0.00 | 182,300.0000 | 0 | 392.70% | 0.00% |
| Sept. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 7200 | $33.09 | 37,000.0000 | 0 | 24.16% | 0.00% |
| Sept. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 800 | $32.57 | 29,800.0000 | 0 | 2.76% | 0.00% |
| Sept. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 7200 | $33.09 | 37,000.0000 | 0 | 24.16% | 0.00% |
| Sept. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 7200 | $33.09 | 37,000.0000 | 0 | 24.16% | 0.00% |
| Sept. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 800 | $32.57 | 29,800.0000 | 0 | 2.76% | 0.00% |
| Sept. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 800 | $32.57 | 29,800.0000 | 0 | 2.76% | 0.00% |
| Sept. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 7200 | $33.09 | 37,000.0000 | 0 | 24.16% | 0.00% |
| Sept. 4, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | CEO & President | P | Common Stock | 800 | $32.57 | 29,800.0000 | 0 | 2.76% | 0.00% |
| March 25, 2024 | Dyne Therapeutics, Inc. | $DYN | Cox John | See Remarks | A | Stock Option (Right to Buy) | 679853 | $0.00 | 679,853.0000 | 0 | 9999.99% | 0.00% |