X0306 4 2022-04-03 0 0001707502 Solid Biosciences Inc. SLDB 0001197032 SMITH IAN F C/O SOLID BIOSCIENCES INC. 141 PORTLAND STREET, 5TH FLOOR CAMBRIDGE MA 02139 1 0 0 0 Common Stock 2022-04-03 4 M 0 24313 A 294583 D Restricted Stock Units 2022-04-03 4 M 0 24313 0.00 D Common Stock 24313 72937 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 vest 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, subject to continued service as a director, and in the event of a change in control, the vesting schedule will accelerate in full. /s/ by Erin P. Brennan as attorney-in-fact for Ian F. Smith 2022-04-05