# EDGAR Filing Document

**Accession Number:** 0001943421
**File Stem:** 0001171843-25-006487
**Filing Date:** 2025-10
**Character Count:** 15482
**Document Hash:** 98b3c3254792288bac5d2390834cbcff
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001171843-25-006487.hdr.sgml**: 20251016

**ACCESSION NUMBER**: 0001171843-25-006487

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20251016

**DATE AS OF CHANGE**: 20251016

**SUBJECT COMPANY**: 

**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:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-95158
- **FILM NUMBER:** 251398004

**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 BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Family Trading Inc.
- **CENTRAL INDEX KEY:** 0001786648

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** 1T

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 11 KANARI STREET
- **CITY:** ATHENS
- **PROVINCE COUNTRY:** J3
- **BUSINESS PHONE:** 011 (30) 210 364 003

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 11 KANARI STREET
- **CITY:** ATHENS
- **PROVINCE COUNTRY:** J3

## Ex-1

**Exhibit 1**

**JOINT FILING UNDERTAKING**

The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13D/A with respect to the shares of common stock of Rubico Inc. to evidence the agreement of the below-named parties, in accordance with the rules promulgated pursuant to the Securities Exchange Act of 1934, as amended, to file this Schedule 13D/A, and any amendments hereto, jointly on behalf of each such party

Dated: October 16, 2025

Family Trading Inc.

---

| | |
|:---|:---|
| Signature: | /s/ Andreas Louka |
| Name/Title: | Andreas Louka / President / Treasurer / Director |
| Date: | 10/16/2025 |

---

3 Sororibus Trust

---

| | |
|:---|:---|
| Signature: | /s/ Alexandros Economou |
| Name/Title: | Alexandros Economou / Sole Director |
| Date: | 10/16/2025 |

---

Evangelos J. Pistiolis

---

| | |
|:---|:---|
| Signature: | /s/ Evangelos J. Pistiolis |
| Name/Title: | Evangelos J. Pistiolis |
| Date: | 10/16/2025 |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 1)**

**Rubico Inc.**

*(Name of Issuer)*

**Common Stock, par value $0.01 per share**

*(Title of Class of Securities)*

**Y1250N107**

*(CUSIP Number)*

**Andreas Louka**<br>11 Kanari Street,<br>Athens J3 106 71<br>011(30)2103640030

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**10/15/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **Y1250N107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Family Trading Inc.** | Name of reporting person<br>**Family Trading Inc.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**1T** | Citizenship or place of organization<br>**1T** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1465359.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1465359.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1465359.00** | Aggregate amount beneficially owned by each reporting person<br>**1465359.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**45.75%** | Percent of class represented by amount in Row (11)<br>**45.75%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

| **CUSIP No.** | **Y1250N107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**3 Sororibus Trust** | Name of reporting person<br>**3 Sororibus Trust** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**G4** | Citizenship or place of organization<br>**G4** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1465359.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1465359.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1465359.00** | Aggregate amount beneficially owned by each reporting person<br>**1465359.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**45.75%** | Percent of class represented by amount in Row (11)<br>**45.75%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **Y1250N107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Evangelos J. Pistiolis** | Name of reporting person<br>**Evangelos J. Pistiolis** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**J3** | Citizenship or place of organization<br>**J3** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**220564.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**220564.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**220564.00** | Aggregate amount beneficially owned by each reporting person<br>**220564.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**6.89%** | Percent of class represented by amount in Row (11)<br>**6.89%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.01 per share

**(b) Name of Issuer:**
Rubico Inc.

**(c) Address of Issuer's Principal Executive Offices:**
20 Iouliou Kaisara Str, Athens, J3, 106 71

Explanatory Note: This Amendment No. 1 to Schedule 13D (this "Amendment No. 1") amends and supplements the Schedule 13D originally filed with the U.S. Securities and Exchange Commission (the "Commission") on August 8, 2025 (the "Existing Schedule 13D" as amended and supplemented by this Amendment No. 1, the "Schedule 13D") by Family Trading Inc. ("Family Trading"), 3 Sororibus Trust (the "Trust") and Mr. Evangelos J. Pistiolis (collectively, the "Reporting Persons" and each a "Reporting Person"). This Amendment No. 1 is being filed to reflect the decrease in the percentage beneficial ownership of shares of common stock, par value $0.01 per share (the "Common Shares") of Rubico Inc., a corporation incorporated in the Marshall Islands (the "Issuer"), held by the Reporting Persons, resulting solely from an increase in the number of Common Shares issued and outstanding, as a result of the sale of Common Shares by the Issuer to B. Riley Principal Capital II, LLC (the "Selling Shareholder") pursuant to a common shares purchase agreement entered into on July 21, 2025 (the "Equity Line Purchase Agreement") between the Issuer and the Selling Shareholder.

Capitalized terms used herein but not otherwise defined shall have the meaning set forth in the Existing Schedule 13D. Unless indicated otherwise, all items left blank remain unchanged, and any items which are amended below are deemed to amend and update the existing items in the Existing Schedule 13D.

**Item 4. Purpose of Transaction**

There are no material changes to this Item 4 from the Existing Schedule 13D.

**Item 5. Interest in Securities of the Issuer**

**(a)**
According to information received from the Issuer, as of October 16, 2025, there were 3,203,269 Common Shares issued and outstanding.

Based on the foregoing, the Reporting Persons report beneficial ownership of the following Common Shares:

Family Trading may be deemed to beneficially own 1,465,359 Common Shares, representing approximately 45.75% of the outstanding Common Shares.

The Trust may be deemed to beneficially own 1,465,359 Common Shares, representing approximately 45.75% of the outstanding Common Shares.

Mr. Evangelos J. Pistiolis may be deemed to beneficially own 220,564 Common Shares, representing approximately 6.89% of the outstanding Common Shares.

Except as described above, to the best knowledge of the Reporting Persons, no other Common Shares are beneficially owned by the persons named in response to Item 2.

If the Reporting Persons were deemed to have formed a Section 13(d) group, such group would be deemed to beneficially own an aggregate of 1,685,923 Common Shares for the purpose of Rule 13d-3 under the Act, which would constitute approximately 52.63% of the issued and outstanding Common Shares. In no case do any of the Reporting Persons have or share voting or investment power with respect to the entirety of that number of Common Shares. Neither the filing of this Amendment No. 1 nor any of its contents shall be deemed to constitute an admission that any of the Reporting Persons (other than to the extent they directly hold Common Shares, reported on this Amendment No. 1) is the beneficial owner of Common Shares referred to herein for purposes of Section 13(d) of the Exchange Act, or for any other purpose, and such beneficial ownership is expressly disclaimed. Each Reporting Person expressly disclaims any assertion or presumption that it and the other persons on whose behalf this Amendment No. 1 is filed constitute a "group."

**(b)**
Family Trading has the sole power to vote or direct the vote of 0 Common Shares and the shared power to vote or direct the vote of 1,465,359 Common Shares. Family Trading has the sole power to dispose or direct the disposition of 0 Common Shares and the shared power to dispose or direct the disposition of 1,465,359 Common Shares.

The Trust has the sole power to vote or direct the vote of 0 Common Shares and the shared power to vote or direct the vote of 1,465,359 Common Shares. The Trust has the sole power to dispose or direct the disposition of 0 Common Shares and the shared power to dispose or direct the disposition of 1,465,359 Common Shares.

Voting and disposition of the Common Shares held by the Trust requires the approval of the Trustee of the Trust.

Mr. Evangelos J. Pistiolis has the sole power to vote or direct the vote of 220,564 Common Shares and the shared power to vote or direct the vote of 0 Common Shares. Mr. Evangelos J. Pistiolis has the sole power to dispose or direct the disposition of 220,564 Common Shares and the shared power to dispose or direct the disposition of 0 Common Shares.

**(c)**
Except for those transactions described herein (see Item 3), to the best knowledge of the Reporting Persons, no other transactions in the Common Shares were effected by the persons named in response to Item 2 during the past 60 days.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

There are no material changes to this Item 6 from the Existing Schedule 13D.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Family Trading Inc.

**Signature:** /s/ Andreas Louka

**Name/Title:** Andreas Louka / President / Treasurer / Director

**Date:** 10/16/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** 3 Sororibus Trust

**Signature:** /s/ Alexandros Economou

**Name/Title:** Alexandros Economou / Sole Director

**Date:** 10/16/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Evangelos J. Pistiolis

**Signature:** /s/ Evangelos J. Pistiolis

**Name/Title:** Evangelos J. Pistiolis

**Date:** 10/16/2025