Table of Contents As filed with the Securities and Exchange Commission on August 15, 2024. Registration No. 333-280951 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 3 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Moleculin Biotech, Inc. (Exact name of registrant as specified in its charter) | Delaware | 2834 | 47-4671997 | | --- | --- | --- | | (State or other jurisdiction of | (Primary Standard Industrial | (I.R.S. Employer | | incorporation or ...