Solid Biosciences Inc. — Director's Dealing 2025

Dec 4, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Solid Biosciences Inc. (SLDB)
CIK: 0001707502
Period of Report: 2025-12-02

Reporting Person: Herzich Paul (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-02	Common Stock	M	7239	—	Acquired	29323	Direct
2025-12-03	Common Stock	S	2701	$5.11	Disposed	26622	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-12-02	Restricted Stock Units	$	M	7239	Disposed		Common Stock (7239)	Direct

Footnotes

F1: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock (the "RSUs").

F2: Includes 1,835 and 1,861 shares of the issuer's common stock acquired under the Solid Biosciences Inc. Employee Stock Purchase Plan on May 30, 2025 and November 28, 2025, respectively.

F3: This sale was made to cover withholding taxes following the vesting of the previously granted RSUs pursuant to a durable automatic sales instruction letter adopted by Mr. Herzich on August 16, 2024 effecting the sell-to-cover election. The sale does not represent a discretionary trade by Mr. Herzich

F4: The RSUs were granted on December 2, 2022 (the "Grant Date") and vest over four years, with 25% of the original number of shares vesting on each anniversary of the Grant Date until the fourth such anniversary.