X0508 4 2025-12-02 0001707502 Solid Biosciences Inc. SLDB 0001954991 Herzich Paul C/O SOLID BIOSCIENCES INC. 500 RUTHERFORD AVENUE, THIRD FLOOR CHARLESTOWN MA 02129 false true false false Chief Technology Officer true Common Stock 2025-12-02 4 M false 7239 A 29323 D Common Stock 2025-12-03 4 S false 2701 5.11 D 26622 D Restricted Stock Units 2025-12-02 4 M false 7239 0.00 D Common Stock 7239 7239 D Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock (the "RSUs"). 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. 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 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. /s/ Kimberly Cornwell as attorney-in-fact for Paul Herzich 2025-12-04