144/A 0000950170-24-132905 0001685994 XXXXXXXX LIVE 0001707502 Solid Biosciences Inc. 001-38360 500 Rutherford Avenue Charlestown MA 02129 (617)-337-4680 Cumbo Alexander Officer Director Common Stock ETRADE FINANCIAL CORPORATION

3 EDISON DRIVE ALPHARETTA GA 30005

11114 62236.23 39954607 12/03/2024 NASDAQ Common Stock 12/02/2024 Settlement of vested restricted stock units Issuer N 11114 12/02/2024 Compensation Y This Form 144/A is being filed to amend the Form 144 filed on December 3, 2024 to change the number of Common Stock to be sold, the aggregate market value, and amount of securities acquired. 12/05/2024 /s/ Alexander Cumbo