EX-32.1 4 sldb-ex32_1.htm EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT

TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Solid Biosciences Inc. (the “Company”) for the quarter ended June 30, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Alexander Cumbo, Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge:

(1)
the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(2)
the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: August 12, 2025 |  | /s/ Alexander Cumbo
|  | Alexander Cumbo
|  | President and Chief Executive Officer
|  | (Principal Executive Officer)