On June 7, 2024, Adam Koppel notified Solid Biosciences Inc. (the ?Company?) of his decision to resign as a member of the Company?s Board of Directors (the ?Board?), effective as of June 11, 2024. Dr. Koppel?s decision to resign from the Board was not due to a disagreement on any matter related to the Company?s operations, policies or practices. Also on June 7, 2024, Rajeev Shah notified the Company of his decision to resign as a member of the Board, effective as of June 11, 2024.

Mr. Shah?s decision to resign from the Board was not due to a disagreement on any matter related to the Company?s operations, policies or practices. The Company thanks and greatly appreciates the contributions both Dr. Koppel and Mr. Shah have made to Solid Biosciences. Following these resignations, the Company?s Board will consist of nine members.