Table of Contents As filed with the Securities and Exchange Commission on December 5, 2025. Registration No. 333-290011 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Amendment No. 2 To 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) Puglisi & Associates 850 Library Avenue, Suite 204 Newark, Delaware ...

Table of Contents As filed with the Securities and Exchange Commission on November 3, 2025. Registration No. 333-290011 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Puglisi & Associates 850 Library Avenue, Suite 204 Newark, Delaware 19711 (302) 738-6680 (Name, address and telephone number of agent for service) 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) Republic of the Marshall I ...

As filed with the Securities and Exchange Commission on February 6, 2023 Registration No. 333-269475 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 SINTX Technologies, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 3841 84-1375299 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification Number) 1885 West 2100 Sou ...