Brian S. Posner - Oct 1, 2025 Form 4 Insider Report for Dyne Therapeutics, Inc. (DYN)

Role
Director
Signature
/s/ Ron Caponigro, Attorney-in-Fact
Stock symbol
DYN
Transactions as of
Oct 1, 2025
Transactions value $
$0
Form type
4
Date filed
10/2/2025, 04:18 PM
Previous filing
Aug 4, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Posner Brian S Director 1560 TRAPELO ROAD, WALTHAM /s/ Ron Caponigro, Attorney-in-Fact 2025-10-02 0001372455

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction DYN Stock option (right to buy) Award $0 +70K $0.00 70K Oct 1, 2025 Common Stock 70K $12.50 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The option was granted on October 1, 2025. The shares underlying the option are scheduled to vest over three years in equal monthly installments through October 1, 2028.