144 0001954991 XXXXXXXX LIVE 0001707502 Solid Biosciences Inc. 001-38360 500 Rutherford Avenue Charlestown MA 02129 (617)-337-4680 Herzich Paul Officer Common Stock ETRADE FINANCIAL CORPORATION

3 EDISON DRIVE 500 RUTHERFORD AVENUE, THIRD FLOOR ALPHARETTA GA 30005

26250 168968.63 82561235 02/02/2026 NASDAQ Common Stock 02/02/2026 Settlement of performance shares Issuer N 26250 02/02/2026 Compensation N Herzich Paul

500 Rutherford Avenue CHARLESTOWN MA 02129

Common Stock 12/03/2025 2701 13802.11 The sale reported on this Form 144 was made to cover witholding taxes following the vesting of previously granted performance stock units pursuant to a durable sale instruction letter adopted by Mr. Herzich on August 16, 2024 effecting the sell-cover-election. The sale does not represent a discretionary trade by Mr. Herzich. 02/02/2026 08/16/2024 /s/ Kimberly Cornwell as attorney-in-fact for Paul Herzich