X0306 4 2019-02-19 0 0001707502 Solid Biosciences Inc. SLDB 0001708198 HERSCHA LYNETTE C/O SOLID BIOSCIENCES INC. 141 PORTLAND STREET, 5TH FLOOR CAMBRIDGE MA 02139 0 1 0 0 See Remark Employee Stock Option (Right to Buy) 8.20 2019-02-19 4 A 0 50000 0.00 A 2029-02-19 Common Stock 50000 50000 D This option was granted February 19, 2019 and vests in four equal annual installments on the anniversary of the grant date, and will vest automatically as to 100% of the unvested portion of such option upon specified change in control events and the termination of the Reporting Person's employment under specified circumstances. Chief Legal Officer and Secretary /s/ Lynette Herscha 2019-02-21