Table of Contents As filed with the U.S. Securities and Exchange Commission on February 23, 2024 Registration No. 333-276868 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Amendment No. 1 To Form F-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 C3is Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Republic of the Marshall Islands 4412 N/A (Primary Standard Industrial Classification Code Number) 331 Ki ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on February 5, 2024 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form F-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 C3is Inc. (Exact name of registrant as specified in its charter) Republic of the Marshall Islands 4412 N/A (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) 331 Kifissias Avenue Erithrea 14 ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on January 8, 2024 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form F-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 C3is Inc. (Exact name of registrant as specified in its charter) Republic of the Marshall Islands 4412 N/A (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) 331 Kifissias Avenue Erithrea 145 ...