# EDGAR Filing Document

**Accession Number:** 0001943421
**File Stem:** 0001171843-25-007323
**Filing Date:** 2025-11
**Character Count:** 11581
**Document Hash:** 22505a9fc1bc0abc8d1f4a947135d7f3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001171843-25-007323.hdr.sgml**: 20251114

**ACCESSION NUMBER**: 0001171843-25-007323

**CONFORMED SUBMISSION TYPE**: 424B3

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20251114

**DATE AS OF CHANGE**: 20251114

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Rubico Inc.
- **CENTRAL INDEX KEY:** 0001943421
- **STANDARD INDUSTRIAL CLASSIFICATION:** WATER TRANSPORTATION [4400]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** 1T
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 424B3
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-290426
- **FILM NUMBER:** 251481796

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** VAS SOFIAS 1 & MEG. ALEXANDROU
- **CITY:** ATHENS
- **PROVINCE COUNTRY:** J3
- **BUSINESS PHONE:** 30 2108128180

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** VAS SOFIAS 1 & MEG. ALEXANDROU
- **CITY:** ATHENS
- **PROVINCE COUNTRY:** J3

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Central Tactical Acquisitions Inc.
- **DATE OF NAME CHANGE:** 20220818

**Filed Pursuant to Rule 424(b)(3)**

**Registration No. 333-290426**

**PROSPECTUS SUPPLEMENT NO. 1**

**(TO PROSPECTUS DATED NOVEMBER 4, 2025)**

**<br> 12,315,270 Units, Each Unit Consisting of One Common Share or One Pre-funded Warrant to Purchase One Common Share and One Class A Warrant to Purchase One Common Share**

**615,763 Representative Warrants**

**(and up to 12,315,270 Common Shares Underlying the Pre-funded Warrants, up to 49,261,080 Common Shares Underlying the Class A Warrants and up to 2,463,052 Common Shares Underlying the Representative Warrants)**

**RUBICO INC.**

This is a supplement (the "Prospectus Supplement") to the prospectus, dated November 4, 2025 (as supplemented or amended from time to time, the "Prospectus") of Rubico Inc. (the "Company"), which forms a part of the Company's Registration Statement on Form F-1 (Registration No. 333-290426), as amended from time to time.

This Prospectus Supplement is being filed to update and supplement the information included in the Prospectus with the information contained in the Company's Report on Form 6-K, furnished to the U.S. Securities and Exchange Commission (the "Commission") on November 14, 2025 (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 by reference to the Prospectus except to the extent that the information in this Prospectus Supplement supersedes the information contained in the Prospectus.

This Prospectus Supplement is not complete without, and may not be delivered or utilized except in connection with, the Prospectus, including any amendments or supplements to it.

**Investing in our securities involves a high degree of risk. See "<u>Risk Factors</u>" beginning on page 12 of the Prospectus for 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 or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.**

**The date of this prospectus supplement is November 14, 2025.**

**UNITED STATES SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 6-K**

**REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934**

For the month of November 2025

Commission File Number: 001-42684

## RUBICO INC.
(Translation of registrant's name into English)

**20 Iouliou Kaisara Str<br> 19002 Paiania** 

**Athens, 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 ☐**

**INFORMATION CONTAINED IN THIS FORM 6-K REPORT**

On November 12, 2025, the Registrant issued a press release, a copy of which is attached hereto as [Exhibit 99.1](exh_991.htm).

As of November 13, 2025, Rubico Inc. (the "Company") had 40,827,280 common shares, par value $0.01 per share (the "Common Shares"), issued and outstanding, which included Common Shares issued upon the exercise of the Class A Warrants to purchase one Common Share (the "Class A Warrants") and warrants issued to Maxim Group LLC (the "Representative Warrants"), following the Company's recent public offering of Common Shares, Class A Warrants and Representative Warrants.

If all of the remaining Class A Warrants are exercised on a zero cash basis after the second warrant reset date on November 18, 2025 (the "Second Reset Date"), there will be 15,674,560 additional Common Shares issued and outstanding. If all of the remaining Representative Warrants are exercised on a zero cash basis after the Second Reset Date, there will be an additional 1,863,052 Common Shares issued and outstanding. See our Current Report on Form 6-K, filed with the U.S. Securities and Exchange Commission on November 7, 2025, for the description of the Class A Warrants.

**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | |
|:---|:---|
|  | **Rubico Inc.** |
| Date: November 14, 2025 | <u><u>By: /s/ Nikolaos Papastratis</u></u> |
|  | Nikolaos Papastratis |
|  | Chief Financial Officer |

---

## Exhibit 99.1

**EXHIBIT 99.1**

**Rubico Inc. Announces Successful Completion of Fleet Refinancing**

ATHENS, Greece, Nov. 12, 2025 (GLOBE NEWSWIRE) -- Rubico Inc. (the "Company" or "Rubico") (NASDAQ:RUBI), an international owner and operator of modern, fuel efficient "ECO" tanker vessels, announced today that it has closed the previously announced sale and leaseback financing agreements (the "SLBs" or "Financing Agreements") with a major Chinese financier for the refinancing of its two 157,000 dwt Suezmax tankers, the M/Ts Eco West Coast and Eco Malibu.

The gross proceeds before fees and related expenses but after repayment of previous debt and a 5-day short term related party bridge loan that facilitated the transaction amounted to about $10.4 million.

<u>Kalliopi Ornithopoulou, the President, Chief Executive Officer and Director of the Company, said:</u>

"The amount of cash released from the concluded deals is significantly in excess of our current market capitalization. Taking into account the new debt levels of our fleet following the refinancings, the leverage of the fleet remains at a very conservative level of about 50%."

<u>Eco West Coast Refinancing</u>

The SLB of M/T Eco West Coast is for an amount of $42.0 million. Pursuant to the SLB terms, we will bareboat charter back the vessel for a period of ten years at bareboat hire rates comprising of 120 consecutive monthly installments of $0.18 million along with a purchase obligation of $20.0 million at the expiry of the bareboat charter, bearing an interest rate of 3-month term SOFR plus a margin of 1.95% per annum. Under the SLB terms, we will have the option to buy back the vessel following the end of the first year at purchase prices stipulated in the bareboat charter agreement depending on when the option is exercised.

<u>Eco Malibu Refinancing</u> 

The SLB of M/T Malibu is for an amount of $42.0 million. Pursuant to the SLB terms, we will bareboat charter back the vessel for a period of ten years at bareboat hire rates comprising of 120 consecutive monthly installments of $0.19 million along with a purchase obligation of $19.0 million at the expiry of the bareboat charter, bearing an interest rate of 3-month term SOFR plus a margin of 2.1% per annum. Under the SLB terms, we will have the option to buy back the vessel following the end of the first year at purchase prices stipulated in the bareboat charter agreement depending on when the option is exercised.

In connection with the Financing Agreements, Rubico Inc. and Rubico Inc.'s parent company, Top Ships Inc, each provided a guarantee of the obligations of our vessel-owning subsidiaries under the respective SLB. The Financing Agreements, and the relevant appurtenant guarantees, contain customary covenants and event of default clauses, including cross-default provisions and restrictive covenants and performance requirements including that we maintain a leverage ratio (as defined in the relevant corporate guarantees) of no more than 85% and minimum liquid funds (as defined in the relevant corporate guarantees) of $0.50 million in connection with the SLB of M/T Eco Malibu and $0.40 million in connection with the SLB of M/T Eco West Coast.

**About the Company**

Rubico Inc. is a global provider of shipping transportation services specializing in the ownership of vessels. The Company is an international owner and operator of two modern, fuel efficient, eco 157,000 dwt Suezmax tankers.

The Company is incorporated under the laws of the Republic of the Marshall Islands and has executive offices in Athens, Greece. The Company's common shares trade on the Nasdaq Capital Market under the symbol "RUBI".

Please visit the Company's website at: <u>https://rubicoinc.com/</u>

**For further information please contact:**

Nikolaos Papastratis

Chief Financial Officer

Rubico Inc.

Tel: +30 210 812 8107

Email: npapastratis@rubicoinc.com

**Forward-Looking Statements**

Matters discussed in this press release may constitute forward-looking statements. The Private Securities Litigation Reform Act of 1995 provides safe harbor protections for forward-looking statements in order to encourage companies to provide prospective information about their business. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements, which are other than statements of historical facts.

The Company desires to take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and is including this cautionary statement in connection with this safe harbor legislation. The words "believe," "anticipate," "intends," "estimate," "forecast," "project," "plan," "potential," "may," "should," "expect" "pending" and similar expressions identify forward-looking statements. The forward-looking statements in this press release are based upon various assumptions, many of which are based, in turn, upon further assumptions, including without limitation, our management's examination of historical operating trends, data contained in our records and other data available from third parties. Although we believe that these assumptions were reasonable when made, because these assumptions are inherently subject to significant uncertainties and contingencies which are difficult or impossible to predict and are beyond our control, we cannot assure you that we will achieve or accomplish these expectations, beliefs or projections. Please see the Company's filings with the Securities and Exchange Commission for a more complete discussion of these and other risks and uncertainties. The information set forth herein speaks only as of the date hereof, and the Company disclaims any intention or obligation to update any forward-looking statements as a result of developments occurring after the date of this communication.