As filed with the Securities and Exchange Commission on April 2, 2024. Registration No. 333-278006 UNITED STATES SECURITIES AND EXCHANGE COMMISSION MUSTANG BIO, INC. Amendment No. 1 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 2836 (Primary Standard Industrial Classification Code Number) Washington, D.C. 20549 47-3828760 (I.R.S. Employer Identification Number) ...