Rubico Inc美股招股说明书(2026-07-10版)

Up to 50,000,000 Common Shares RUBICO INC. This is a supplement (the “Prospectus Supplement”) to the prospectus, dated May 1, 2026 (as supplemented or amended fromtime to time, the “Prospectus”) of Rubico Inc. (the “Company”), which forms a part of the Company’s Registration Statement on FormF-1 (Registration Nos. 333-295199 and 333-297277), as amended from time to time. This Prospectus Supplement is being filed to update and supplement the information included in the Prospectus with theinformation contained in the Company’s Report on Form 6-K, furnished to the U.S. Securities and Exchange Commission (the“Commission”) on July 10, 2026 (the “Form 6-K”). Accordingly, the Form 6-K is attached to this Prospectus Supplement. This Prospectus Supplement should be read in conjunction with, and delivered with, the Prospectus and is qualified byreference to the Prospectus except to the extent that the information in this Prospectus Supplement supersedes the informationcontained in the Prospectus. This Prospectus Supplement is not complete without, and may not be delivered or utilized except in connection with, theProspectus, including any amendments or supplements to it. Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page 10 of the Prospectusfor a discussion of information that should be considered in connection with an investment in our securities. Neither the Commission nor any state securities commission has approved or disapproved of these securities ordetermined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense. The date of this prospectus supplement is July 10, 2026. UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2026 Commission File Number:001-42684 RUBICO INC.(Translation of registrant’s name into English) 20 Iouliou Kaisara Str19002, PaianiaAthens – Greece (Address of principal executive office) Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F☒Form 40-F☐ On July 9, 2026, Rubico Inc. (the “Company”) held a Special Meeting of Shareholders (the “Special Meeting”). At theSpecial Meeting, the shareholders of the Company approved and adopted a proposal to approve one or more amendments to theCompany’s Amended and Restated Articles of Incorporation to effect one or more reverse stock splits of the shares of the Company’scommon stock issued and outstanding at the time of the reverse split at a cumulative exchange ratio of between one-for-two and one-for-250, inclusive, with the Company’s board of directors (including any duly constituted committee thereof, the “Board”) todetermine, in its sole discretion, whether to implement any reverse stock split, as well as the specific timing and ratio, within suchapproved range of ratios, and to authorize the Board to implement any such reverse stock split by filing any such amendment with theRegistrar of Corporations of the Republic of the Marshall Islands; provided that any such reverse stock split or splits are implementedon or before January 15, 2027. The information contained in this Report is hereby incorporated by reference into the Company’s registration statement onForm F-3 (File No. 333-297207). SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed onits behalf by the undersigned, thereunto duly authorized. RUBICO INC.(Registrant) By: /s/ Nikolaos PapastratisName:Nikolaos PapastratisTitle:Chief Financial Officer