As filed with the Securities and Exchange Commission on September 10, 2025 Registration Statement No. 333-289864 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1/A (Amendment No. 1) REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ENTERO THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 2834 46-4993860 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer ...

As filed with the Securities and Exchange Commission on August 26, 2025 Registration Statement No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ENTERO THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 2834 46-4993860 (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification Number) 777 Y ...

As filed with the Securities and Exchange Commission on December 18, 2023 Registration No. 333-275316 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 FIRST WAVE BIOPHARMA, INC. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 2834 46-4993860 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identifica ...

As filed with the Securities and Exchange Commission on November 3, 2023 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 FIRST WAVE BIOPHARMA, INC. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) Delaware 2834 46-4993860 (I.R.S. Employer Identification Number) 777 Yamato Ro ...