Dyne Therapeutics, Inc. 4

Insider Brian S. Posner bought 2,000 shares of Dyne Therapeutics, Inc. common stock and received a 35,152-share stock option grant.

On this Form 4, reporting person Brian S. Posner, an insider of Dyne Therapeutics, Inc., reported two transactions: an open-market purchase of 2,000 shares of Dyne common stock on June 8, 2026 at $16.94 per share for approximately $33,880, and the grant of a stock option on June 5, 2026 covering 35,152 shares at an exercise price of $17.04 per share, which vests in full on the earlier of June 5, 2027 or the date of the company’s 2027 annual meeting of stockholders, subject to continued service; following these transactions, he beneficially owns 24,500 shares of common stock directly plus the newly awarded option. The common stock position after the purchase is valued at roughly $414,030 based on the reported purchase price.

Filing Facts

CIK

1818794

Ticker

DYN

Form

4

Source Type

sec

Accession

0001193125-26-264004

Alert Tier

7