X0306 4 2021-01-27 0 0001707502 Solid Biosciences Inc. SLDB 0001727410 Ziolkowski Jennifer Lynn C/O SOLID BIOSCIENCES INC. 141 PORTLAND STREET, FIFTH FLOOR CAMBRIDGE MA 02139 0 1 0 0 CFO, Treasurer & Asst. Secy Common Stock 2021-01-27 4 M 0 11500 A 339109 D Common Stock 2021-01-28 4 S 0 3473 6.1409 D 335636 D Restricted Stock Units 2021-01-27 4 M 0 11500 0.00 D Common Stock 11500 0 D Restricted Stock units convert into common stock on a one-for-one basis. This sale was made to cover withholding taxes following the vesting of the previously granted restricted stock units. On January 27, 2020, the reporting person was granted 23,000 restricted stock units, vesting in two equal installments. Fifty percent vested six months after the grant date with the remaining fifty percent vesting on the first anniversary of the grant date. /s/ by Ilan Ganot as attorney-in-fact for Jennifer Lynn Ziolkowski 2021-01-29