X0306 4 2023-01-03 0 0001707502 Solid Biosciences Inc. SLDB 0001197032 SMITH IAN F C/O SOLID BIOSCIENCES INC. 500 RUTHERFORD AVENUE, THIRD FLOOR CHARLESTOWN MA 02129 1 0 0 0 Common Stock 2023-01-03 4 M 0 1620 A 37670 D Restricted Stock Units 2023-01-03 4 M 0 1620 0.00 D Common Stock 1620 0 D Stock Option (Right to Buy) 5.62 2023-01-03 4 M 0 70796 0.00 A 2033-01-03 Common Stock 70796 70796 D Restricted Stock Units 2023-01-03 4 A 0 62278 0.00 A Common Stock 62278 62278 D Restricted stock units convert into common stock on a one-for-one basis. The restricted stock units were granted on January 3, 2022 and vested in equal quarterly installments beginning three months from the date of the grant, with the final installment vesting 12 months from the date of the grant. The Smith RSUs (as defined in footnote 4) and this option (together with the Smith RSUs, the "Smith Equity Awards") were granted on January 3, 2023 (the "Grant Date") and vest in equal quarterly installments with the first installment vesting three months from the Grant Date and the final installment vesting date being the date that is 12 months from the Grant Date; provided that in the event of the early termination of the First Amendment to Executive Chair Agreement between the Issuer and the reporting person (the "Smith Agreement") prior to the expiration of the Term (as defined in the Smith Agreement) and/or a change in control of the Issuer, the Smith Equity Awards shall accelerate in full. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock (the "Smith RSUs"). /s/ David Tyronne Howton as attorney-in-fact for Ian F. Smith 2023-01-05