X0206 3 2025-02-18 0 0001707502 Solid Biosciences Inc. SLDB 0001535978 Adage Capital Management, L.P. 200 CLARENDON STREET, 52ND FLOOR BOSTON MA 02116 0 0 1 0 0001403404 Atchinson Robert 200 CLARENDON STREET 52ND FLOOR BOSTON MA 02116 0 0 1 0 0001403413 Gross Phillip 200 CLARENDON STREET 52ND FLOOR BOSTON MA 02116 0 0 1 0 Common Stock, $0.001 par value per share 3995539 I See footnotes The securities to which this filing relates are held directly by Adage Capital Partners, L.P., a Delaware limited partnership ("ACP"). Adage Capital Management, L.P., a Delaware limited partnership ("ACM"), serves as the investment manager of ACP and as such has discretion over the portfolio securities held by ACP. Robert Atchinson and Phillip Gross are the managing members of (i) Adage Capital Advisors, L.L.C., a Delaware limited liability company, managing member of Adage Capital Partners GP, L.L.C., a Delaware limited liability company, general partner of ACP and (ii) Adage Capital Partners LLC, a Delaware limited liability company, general partner of ACM. Each of the reporting persons disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities and Exchange Act of 1934, as amended, except as to such extent of such reporting person's pecuniary interest in the securities, if any. As of the date of this filing, the Reporting Persons are no longer greater than 10% beneficial owners of the number of shares of Common Stock currently outstanding. /s/ Adage Capital Management, L.P.; By: its general partner Adage Capital Partners LLC; By its managing member Robert Atchinson 2025-02-19 /s/ Robert Atchinson 2025-02-19 /s/ Phillip Gross 2025-02-19