Table of Contents Registration No. 333- As filed with the Securities and Exchange Commission on December 19, 2023 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 PHIO PHARMACEUTICALS CORP. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 2834 (Primary Standard Industrial Classification Code Number) 45-3215903 (I.R.S. Employer Identification Nu ...

Table of Contents As filed with the Securities and Exchange Commission on June 8, 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 PHIO PHARMACEUTICALS CORP. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 2834 (Primary Standard Industrial Classification Code Number) 257 Simarano Drive, Suite 101 Marlborough, Massach ...

Table of Contents As filed with the Securities and Exchange Commission on April 28, 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 PHIO PHARMACEUTICALS CORP. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 2834 (Primary Standard Industrial Classification Code Number) 45-3215903 (I.R.S. Employer Identification Numbe ...