Barry E. Greene's Stock Option Grant

Barry E. Greene, a director at Dyne Therapeutics, Inc. (DYN), was granted 57,463 stock options on June 22, 2026. The options have an exercise price of $20.87 and expire on June 21, 2036. These options are exercisable and vest over three years, with equal monthly installments through June 22, 2029. The transaction, reported on Form 4, indicates a direct ownership of these options, with a post-transaction share count of 57,463. The underlying securities are common stock.