As filed with the U.S. Securities and Exchange Commission on December 11, 2025. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form F-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Rubico Inc. (Exact name of Registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) 4412 (Primary Standard Industrial Classification Code Number) N/A (I.R.S. Employer Identification No.) 20 Iouliou Kaisara Str 19002 Paiania Ath ...

Registration No. 333-289552 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to Form F-1 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 incorporation or organization) 4412 (Primary Standard Industrial Classification Code Number) N/A (I.R.S. Employer Identification No.) 20 Iouliou Kaisara Str 19002 Paiania Athens, Greece +30 210 81 ...

Core Viewpoint - TOP Ships Inc. is executing a spin-off of its vessels into a new entity, Rubico Inc., with key dates for distribution and trading outlined [1][2][3]. Group 1: Spin-off Details - The expected distribution date for Rubico common shares is August 1, 2025 [1]. - Rubico shares will begin trading on the Nasdaq Capital Market under the ticker "RUBI" on August 4, 2025 [2]. - The spin-off involves two vessels, M/T Eco Malibu and M/T Eco West Coast, both modern, fuel-efficient Suezmax tankers [3]. Group 2: Shareholder Information - TOP Ships will distribute 100% of Rubico's common shares pro rata to its securityholders of record as of June 16, 2025 [3]. - The NYSE American has established an ex-distribution date of June 16, 2025, after which TOP Ships shares will trade without entitlement to Rubico shares [3]. Group 3: Regulatory Filings - Rubico has filed a registration statement on Form 20-F with the SEC, detailing the terms of the spin-off [4].