Form 4 Filing for Dyne Therapeutics, Inc.

This filing details a series of stock sales by Kersten Dirk, a director at Dyne Therapeutics, Inc. The transactions occurred on July 27, 2026, and involved the sale of 256,072 shares of Common Stock at a weighted average price of $25.5024, and 5,388 shares at a weighted average price of $26.0428. These sales were executed under a Rule 10b5-1 trading plan. The shares are held indirectly through ForDyne B.V., with ownership and control details involving various Forbion entities and individuals. Following these transactions, the post-sale shareholding is reported as 3,592,184 and 3,586,796 shares, respectively. Kersten Dirk disclaims beneficial ownership except to the extent of his pecuniary interest.