Rubico extends $3.7M payment deadline to October 31

The amended payment terms allow Rubico to settle the remaining balance in cash or newly issued Series G Convertible Preferred Shares.

Rhea-AI Filing Summary

Rubico Inc. (RUBI) amended its related-party transaction with TOP Ships Inc. on September 30, 2026, concerning Rubico’s acquisition of Roman Shark V Inc. under a July 27, 2026 Share Purchase Agreement. The purchase price was $6.5 million, of which $2.8 million has been settled in cash, leaving a $3.7 million balance.

The balance, originally due September 30, 2026, is now due October 31, 2026. At Rubico’s election, it may be settled in cash or newly issued shares of the company’s existing Series G Convertible Preferred Shares. Roman Shark V is party to a shipbuilding contract for one 47,499 dwt MR chemical/product oil tanker.

Key Figures

Aggregate purchase price: $6.5 million Cash settled: $2.8 million Outstanding balance: $3.7 million +1 more

4 metrics

Aggregate purchase price $6.5 million Roman Shark V acquisition

Cash settled $2.8 million Amount settled toward the purchase price

Outstanding balance $3.7 million Payment deadline extended to October 31, 2026

Tanker deadweight 47,499 dwt Vessel covered by Roman Shark V’s shipbuilding contract

Key Terms

related-party transaction, Share Purchase Agreement, Series G Convertible Preferred Shares, dwt

4 terms

related-party transaction financial

"amend a previously disclosed related-party transaction"

A related-party transaction is a deal, payment or transfer of value between a company and people or entities closely connected to its managers, directors or major owners—think of a business hiring a company owned by the CEO’s sibling. Investors care because such deals can be biased, overprice goods or hide conflicts of interest, affecting profits and trust; clear disclosure and fair terms help ensure the company is run in shareholders’ best interest.

Share Purchase Agreement financial

"pursuant to a Share Purchase Agreement"

A share purchase agreement is a written contract that outlines the terms and conditions for buying and selling shares of a company. It specifies details like the price, number of shares, and any special conditions, ensuring both buyer and seller agree on the transaction. For investors, it provides clarity and legal protection, making sure the purchase is clear and enforceable.

Series G Convertible Preferred Shares financial

"newly-issued shares of the Company’s existing series"

dwt technical

"one 47,499 dwt MR chemical/product oil tanker"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How can RUBI settle the $3.7 million balance owed to TOP Ships?

Rubico may settle the $3.7 million balance in cash or, at its election, in newly issued shares of its existing Series G Convertible Preferred Shares. The amended payment deadline is October 31, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/15/2026 - 04:30 PM EDT Accepted by SEC EDGAR 10/15/2026 - 04:30 PM EDT Learn about SEC filing dates

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 October 2026

Commission File Number: 001-42684

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

20 Iouliou Kaisara Str
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 [ X ] Form 40-F [ ]

On September 30, 2026, Rubico Inc. (the “Company”) entered into an agreement with TOP Ships Inc. (“TOPS”), a related party to the Company, to amend a previously disclosed related-party transaction.

The amendment relates to the balance owed to TOPS in connection with the Company’s acquisition of Roman Shark V Inc. (“Roman Shark V”) from TOPS pursuant to a Share Purchase Agreement by and between TOPS and the Company dated July 27, 2026. Roman Shark V is party to a shipbuilding contract dated February 3, 2026 with Guangzhou Shipyard International Company Limited and China Shipbuilding Trading Co., Ltd. for the construction of one 47,499 dwt MR chemical/product oil tanker.

The aggregate purchase price for Roman Shark V was $6.5 million, of which $2.8 million has been settled in cash. The outstanding balance of $3.7 million was originally due on September 30, 2026. That payment deadline was extended on that date to October 31, 2026 and may be settled in cash or, at the Company’s election, in newly-issued shares of the Company’s existing series of Series G Convertible Preferred Shares.

The information contained in this Report is hereby incorporated by reference into the Registrant’s registration statement on Form 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 on its behalf by the undersigned, thereunto duly authorized.

		RUBICO INC.
		(Registrant)
Date: October 15, 2026		/s/ Nikolaos Papastratis
		Nikolaos Papastratis
		Chief Financial Officer