X0609 4 2026-10-18 0001707502 Solid Biosciences Inc. SLDB 0001997809 Brooks Gabriel false C/O SOLID BIOSCIENCES INC. 500 RUTHERFORD AVENUE, THIRD FLOOR CHARLESTOWN MA 02129 false true false false Chief Medical Officer true Common Stock 2026-10-18 4 M false 9750 A 101615 D Common Stock 2026-10-19 4 S false 4374 5.62 D 97241 D Restricted Stock Units 2026-10-18 4 M false 9750 0 D Common Stock 9750 9750 D Restricted stock units ("RSUs") convert into common stock on a one-for-one basis. Includes 2,399 shares of common stock acquired under the Solid Biosciences Inc. Employee Stock Purchase Plan on May 29, 2026. This sale was made to cover withholding taxes following the vesting of previously granted RSUs pursuant to a durable automatic sale instruction letter adopted by Dr. Brooks on August 15, 2024 effecting the sell-to-cover election. The sale does not represent a discretionary trade by Dr. Brooks. The RSUs were granted on October 18, 2023 (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 Gabriel Brooks 2026-10-20