X0306 4 2020-06-16 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 2020-06-16 4 A 0 75000 0.00 A 319700 D The reported transaction is a grant of restricted stock units representing 75,000 shares of common stock. This grant will vest in two equal installments with the first fifty percent vesting on March 11, 2021 and the second fifty percent on March 11, 2022. /s/ by Lynette Herscha as attorney-in-fact for Jennifer Ziolkowski 2020-06-18