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 ...

As filed with the Securities and Exchange Commission on July 30, 2024. (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies to: Registration No. 333-280951 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 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 o ...

As filed with the Securities and Exchange Commission on July 22, 2024. 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 organization) | Classification Code Number) | Identification Number) | | | 5300 Memorial Drive, Suite 950 | | | | Houston, Texas 77007 | | ...