Trillium Trading reports 0 Class A shares in Rubico Inc. (RUBI)

Rhea-AI Filing Summary

Rubico Inc. receipt of an amended Schedule 13G/A from Trillium Trading, LLC discloses that Trillium reports 0 Class A Ordinary Shares beneficially owned, representing 0% of the class as reported in the amendment dated 06/11/2026.

Key Figures

Filing type: Schedule 13G/A Beneficially owned: 0 shares Percent of class: 0% +3 more

6 metrics

Filing type Schedule 13G/A Amendment No. 1 dated 06/11/2026

Beneficially owned 0 shares Class A Ordinary Shares

Percent of class 0% Class A Ordinary Shares as reported

CUSIP Y1250N123 Class A Ordinary Shares identifier

Filer address 417 Fifth Ave, New York, NY 10016 Trillium Trading, LLC principal business office

Signature date 06/12/2026 Signed by Compliance Officer Louis Capone

Key Terms

Schedule 13G/A, Beneficially owned, CUSIP

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 Rubico Inc. Class A Ordinary Shares"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficially owned financial

"Amount beneficially owned: 0 (b) Percent of class: 0 %"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

CUSIP technical

"Class A Ordinary Shares CUSIP No.: Y1250N123"

A CUSIP is a nine-character alphanumeric code that uniquely identifies a U.S. or Canadian financial security—such as a stock, bond, or fund share—like a Social Security number for an investment. It matters to investors because brokers, exchanges and record-keepers use the CUSIP to match trades, track ownership, settle transactions and pull accurate records, reducing errors and ensuring money and securities go to the right place.

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

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Available on EDGAR 06/12/2026 - 08:42 AM Accepted by SEC EDGAR 06/12/2026 - 08:42 AM Learn about SEC filing dates

FAQ

What does Rubico Inc. (RUBI) Schedule 13G/A filed by Trillium Trading disclose?

The filing states Trillium Trading, LLC beneficially owns 0 Class A Ordinary Shares of Rubico Inc., equal to 0% of that class. The amendment is dated 06/11/2026 and signed on 06/12/2026 by a compliance officer.

Who filed the Schedule 13G/A for RUBI and what is their listed address?

The filer is Trillium Trading, LLC, listed with a principal business address at 417 Fifth Ave, New York, NY 10016. The filing lists the entity as a Delaware limited liability company organized under U.S. law.

Does the Trillium 13G/A amendment show any voting or dispositive power over RUBI shares?

No. The amendment reports 0 sole voting power, 0 shared voting power, 0 sole dispositive power, and 0 shared dispositive power for Class A Ordinary Shares.

What CUSIP is associated with the Rubico Inc. Class A Ordinary Shares in this filing?

The filing identifies the Class A Ordinary Shares with CUSIP Y1250N123, which is the unique identifier provided on the Schedule 13G/A cover information.

Who signed the Trillium amendment and when was it signed?

The amendment is signed by Louis Capone, titled Compliance Officer, with a signature date of 06/12/2026 as shown on the filing.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Rubico Inc.

(Name of Issuer)

Class A Ordinary Shares

(Title of Class of Securities)

Y1250N123

(CUSIP Number)

06/11/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): Y1250N123

1

Names of Reporting Persons

Trillium Trading, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

NEW YORK

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.0 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Rubico Inc.
(b)	Address of issuer's principal executive offices: VAS SOFIAS 1 & MEG. ALEXANDROU, VAS SOFIAS 1 & MEG. ALEXANDROU, ATHENS, GREECE, 19002
Item 2.
(a)	Name of person filing: Trillium Trading, LLC
(b)	Address or principal business office or, if none, residence: 417 Fifth Ave, New York, NY 10016
(c)	Citizenship: Limited liability company organized under the laws of the State of Delaware, United States of America
(d)	Title of class of securities: Class A Ordinary Shares
(e)	CUSIP No.: Y1250N123
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 0
(b)	Percent of class: 0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of:
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

Trillium Trading, LLC

Signature:	Louis Capone
Name/Title:	Compliance Officer
Date:	06/12/2026