John Cox - 12 Feb 2026 Form 4 Insider Report for Dyne Therapeutics, Inc. (DYN)

Role
CEO & President, Director
Signature
/s/ Ron Caponigro, Attorney-in-Fact
Issuer symbol
DYN
Transactions as of
12 Feb 2026
Net transactions value
$0
Form type
4
Filing time
17 Feb 2026, 17:11:53 UTC
Previous filing
05 Dec 2025
Next filing
06 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Cox John CEO & President, Director C/O DYNE THERAPEUTICS, INC., 1560 TRAPELO ROAD, WALTHAM /s/ Ron Caponigro, Attorney-in-Fact 17 Feb 2026 0001498428

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction DYN Common Stock Award $0 +180,000 +91% $0.000000 376,877 12 Feb 2026 Direct F1, F2
holding DYN Common Stock 18,000 12 Feb 2026 By Trust #1 F3
holding DYN Common Stock 18,000 12 Feb 2026 By Trust #2 F3
holding DYN Common Stock 18,000 12 Feb 2026 By Trust #3 F3
holding DYN Common Stock 18,000 12 Feb 2026 By Trust #4 F3

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 +285,000 $0.000000 285,000 12 Feb 2026 Common Stock 285,000 $16.00 Direct F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Consists of shares of Common Stock issuable under 180,000 restricted stock units ("RSUs"). Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs are scheduled to vest in equal quarterly installments over four years with the first installment vesting on May 12, 2026.
F2 Includes 288,976 unvested RSUs.
F3 These shares are held in a trust for the benefit of a child of the Reporting Person.
F4 This option was granted on February 12, 2026. The shares underlying the option are scheduled to vest over four years in equal monthly installments through February 12, 2030.