Rubico (Nasdaq: RUBI) to enact 1-for-7.8 reverse stock split on Feb. 12

Rhea-AI Filing Summary

Rubico Inc. files a prospectus supplement related to its registration of 12,315,270 units and associated warrants, and updates investors with a reverse stock split decision. The company will implement a 1-for-7.8 reverse stock split of its common shares, effective at the opening of trading on February 12, 2026, with shares continuing to trade on Nasdaq under “RUBI.”

Every 7.8 issued and outstanding common shares will convert into 1 share, with no change to par value or the total number of authorized shares. Outstanding shares will move from 3,979,412 as of February 10, 2026 to approximately 510,180, subject to fractional share adjustments. No fractional shares will be issued; instead, holders receive cash based on the February 11, 2026 closing price. The company states the reverse split is intended to increase its share price and help maintain compliance with Nasdaq’s continued listing requirements, without changing ownership percentages, market capitalization, or voting rights apart from fractional share treatment.

Insights

Equity structure and listings analyst

Rubico consolidates shares in a 1-for-7.8 reverse split to support Nasdaq listing.

Rubico Inc. is executing a 1-for-7.8 reverse stock split effective at the opening of trading on February 12, 2026. This moves outstanding common shares from 3,979,412 as of February 10, 2026 to approximately 510,180, while keeping par value and authorized share count unchanged.

The company states the goal is to increase its common share price and maintain compliance with Nasdaq continued listing requirements. Because each investor’s proportional ownership and voting rights are preserved, aside from fractional share adjustments, the economic interests remain the same at the time of the split.

No fractional shares will be issued; instead, holders receive cash based on the closing price on February 11, 2026 for any residual fraction. Future disclosures may clarify how the post-split share price and trading volume evolve following the effective date on the Nasdaq Capital Market.

Filed Pursuant to Rule 424(b)(3)

Registration No. 333-290426

PROSPECTUS SUPPLEMENT NO. 10

(TO PROSPECTUS DATED NOVEMBER 4, 2025)

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 February 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 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 “Risk Factors” 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 February 10, 2026.

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 February 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 February 10, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Attached hereto as Exhibit 1.1 is a copy of the Articles of Amendment to the Amended and Restated Articles of Incorporation of the Registrant, filed with the Registrar of Corporations of the Republic of the Marshall Islands on February 10, 2026.

Exhibit 1.1. Articles of Amendment to Amended and Restated Articles of Incorporation

Exhibit 99.1. Press release dated February 10, 2026

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: February 10, 2026		/s/ Nikolaos Papastratis
		Nikolaos Papastratis
		Chief Financial Officer

Exhibit 1.1

  ARTICLES OF AMENDMENT OF RUBICO INC. Reg. No. 115734

NON-RESIDENT	REPUBLIC OF THE MARSHALL ISLANDS REGISTRAR OF CORPORATIONS DUPLICATE COPY The original of this document was FILED ON
	February 10, 2026                                     Karim Fakhri Deputy Registrar

ARTICLES OF AMENDMENT

TO THE

AMENDED AND RESTATED ARTICLES OF INCORPORATION

OF

RUBICO INC.

PURSUANT TO SECTION 90 OF

THE MARSHALL ISLANDS BUSINESS CORPORATIONS ACT

The undersigned, Nikolaos Papastratis, as the Chief Financial Officer of Rubico Inc., a corporation incorporated under the laws of the Republic of the Marshall Islands (the “Corporation”), for the purpose of amending the Amended and Restated Articles of Incorporation of said Corporation pursuant to Section 90 of the Business Corporations Act, as amended, hereby certifies that:

1. The name of the Corporation is: Rubico Inc.

2. The Articles of Incorporation were filed with the Registrar of Corporations as of the 11th day of August, 2022, and were amended and restated in their entirety as of the 26th day of June, 2025.

3. Section D of the Amended and Restated Articles of Incorporation is hereby amended by adding the following paragraph to the end of the Section:

Effective with the commencement of business on February 12, 2026, the Corporation has effected a one-for-seven-and-eight-tenths reverse stock split as to its issued and outstanding common shares, pursuant to which the number of issued common shares shall decrease from approximately 3,979,412 to approximately 510,180 as adjusted for the cancellation of fractional shares and which may be further adjusted for the cancellation of fractional shares. The reverse stock split shall not change the number of registered common shares the Corporation is authorized to issue or the par value of the common shares. The stated capital of the Corporation is hereby reduced from approximately $39,794 to approximately $5,101, as adjusted for the cancellation of the fractional shares and which may be further adjusted for the cancellation of fractional shares, and the amount of the reduction in stated capital shall be allocated to surplus.

4. All of the other provisions of the Amended and Restated Articles of Incorporation shall remain unchanged.

5. This amendment to the Amended and Restated Articles of Incorporation was approved by unanimous written consent of holders of capital stock of the Corporation on June 23, 2025, and by the Corporation’s Board of Directors on February 2, 2026.

[Signature Page Follows]

IN WITNESS WHEREOF, the undersigned has executed this Amendment to the Amended and Restated Articles of Incorporation on this 9th day of February, 2026.

By:

 

Name: Nikolaos Papastratis

Title: Chief Financial Officer

EXHIBIT 99.1

Rubico Inc. Announces Reverse Stock Split

ATHENS, Greece, Feb. 10, 2026 (GLOBE NEWSWIRE) -- Rubico Inc. (Nasdaq: RUBI) (the “Company” or “Rubico”), a global provider of shipping transportation services specializing in the ownership of vessels, announced today that its board of directors (the “Board”) has determined to effect a 1-for-seven-and-eight-tenths reverse stock split (the “Reverse Stock Split”) of the Company’s issued common shares, par value $0.01 (the “Common Shares”), effective at the opening of trading on February 12, 2026.

Reverse Stock Split
The Reverse Stock Split will be effective, and the Common Shares will begin trading on a split-adjusted basis on the Nasdaq Capital Market (“Nasdaq”), at the opening of trading on February 12, 2026, under the existing trading symbol “RUBI.” The new CUSIP number for the Common Shares following the Reverse Stock Split will be Y1250N 115.

When the Reverse Stock Split becomes effective, every 7.8 issued and outstanding Common Shares will be automatically converted into 1 issued and outstanding Common Share without any change in (i) the par value per share or (ii) the total number of Common Shares the Company is authorized to issue.

Details
The Reverse Stock Split will not (i) affect any shareholder’s ownership percentage of Common Shares (except as a result of the cancellation of fractional shares), (ii) have any direct impact on the market capitalization of the Company, or (iii) modify any voting rights or other terms of the Common Shares. As of February 10, 2026, the Company had 3,979,412 outstanding Common Shares, which will be reduced to approximately 510,180 Common Shares, to be adjusted for cancellation of any fractional shares.

No fractional shares will be created or issued in connection with the Reverse Stock Split. Shareholders who otherwise would be entitled to receive fractional shares because their pre-split holdings of Common Shares are not evenly divisible by the number of pre-split shares for which each post-split share is to be exchanged will receive a cash payment in lieu thereof at a price equal to that fraction of a share to which the shareholder would otherwise be entitled, multiplied by the closing price of the Common Shares on Nasdaq on February 11, 2026.

Shareholders with shares held in book-entry form or through a bank, broker, or other nominee are not required to take any action and will see the impact of the Reverse Stock Split reflected in their accounts on or after February 12, 2026. Such beneficial holders may contact their bank, broker, or nominee for more information.

The purpose of the reverse stock split is to increase the market price of the Company’s common stock. The Company believes that the reverse stock split will increase the market price for its common stock and allow it to maintain compliance with Nasdaq’s continued listing requirements.

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: https://rubicoinc.com/

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, including with respect to the maintenance of the Company’s Nasdaq listing.

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.

FAQ

What reverse stock split did Rubico Inc. (RUBI) approve?

Rubico Inc. approved a 1-for-7.8 reverse stock split of its common shares. Every 7.8 issued and outstanding common shares will automatically convert into one share, with no change to par value or the total number of authorized common shares.

When will the Rubico Inc. (RUBI) reverse stock split take effect?

The Rubico Inc. reverse stock split becomes effective at the opening of trading on February 12, 2026. On that date, the common shares will begin trading on a split-adjusted basis on the Nasdaq Capital Market under the existing symbol “RUBI.”

How will Rubico Inc.’s outstanding shares change after the reverse split?

As of February 10, 2026, Rubico Inc. had 3,979,412 outstanding common shares. After the 1-for-7.8 reverse stock split, this will be reduced to approximately 510,180 common shares, subject to adjustments for the cancellation of any resulting fractional shares.

How will Rubico Inc. handle fractional shares from the reverse stock split?

Rubico Inc. will not issue fractional shares in the reverse stock split. Shareholders otherwise entitled to a fraction will receive cash instead, calculated by multiplying the fraction by the closing price on Nasdaq on February 11, 2026.

Does the Rubico Inc. reverse stock split change ownership percentages or voting rights?

The reverse stock split does not change each shareholder’s ownership percentage or voting rights, except for effects from fractional share cancellation. The company states it will not directly impact market capitalization or modify any other terms of the common shares.

Why is Rubico Inc. conducting a 1-for-7.8 reverse stock split?

Rubico Inc. states the purpose of the reverse stock split is to increase the market price of its common stock. The company believes a higher share price will help it maintain compliance with Nasdaq’s continued listing requirements on the Nasdaq Capital Market.