REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Rubico Inc. (Exact name of Registrant as specified in its charter) Republic of the Marshall Islands (State or other jurisdiction of As filed with the U.S. Securities and Exchange Commission on August 20, 2025. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to Form F-1 incorporation or organization) 4412 (Primary Standard Industrial N/A (I.R.S. Employer Identification No.) Classification Code Number) 20 Iouliou K ...