X0306 4 2023-01-27 0 0001707502 Solid Biosciences Inc. SLDB 0001727571 Morris Carl Ashley C/O SOLID BIOSCIENCES INC. 500 RUTHERFORD AVENUE, THIRD FLOOR CHARLESTOWN MA 02129 0 1 0 0 Chief Scientific Officer Common Stock 2023-01-27 4 M 0 1233 A 20201 D Common Stock 2023-01-27 4 S 0 441 7.49 D 19760 D Restricted Stock Units 2023-01-27 4 M 0 1233 0.00 D Common Stock 1233 3700 D Restricted stock units convert into common stock on a one-for-one basis. Includes 490 shares of common stock and 1,462 shares of common stock acquired under the Solid Biosciences Inc. Employee Stock Purchase Plan on May 31, 2022 and November 30, 2022, respectively. This sale was made to cover withholding taxes following the vesting of the previously granted restricted stock units. The shares were sold pursuant to a written instruction under Rule 10b5-1(c)(1). On January 27, 2022 (the "Grant Date"), the reporting person was granted 4,933 restricted stock units, vesting in four equal installments on the anniversary of the grant date. /s/ by David Tyrone Howton as attorney-in-fact for Carl Ashley Morris 2023-01-31