Amendment No. 9 to Schedule 13D for Solid Biosciences Inc.

Perceptive Advisors LLC, along with affiliated entities, has acquired 11,969,079 shares of Solid Biosciences Inc. common stock, representing 12.9% ownership. This acquisition, valued at approximately $97.9 million, was made through a private placement on March 9, 2026, involving the purchase of 8,912,655 pre-funded warrants for $49.9 million. The shares were acquired using working capital. The reporting persons are subject to a beneficial ownership limitation, preventing the exercise of warrants if it would result in ownership exceeding 9.99%. The filing also details stock options held by Adam Stone and incorporates by reference agreements related to the private placement and registration rights.