HRT FINANCIAL LP reports 384,941 Rubico shares

HRT FINANCIAL LP filed an initial ownership report as a ten percent owner of Rubico Inc. common stock.

Rhea-AI Filing Summary

HRT FINANCIAL LP filed an initial ownership report as a ten percent owner of Rubico Inc. common stock. The filing lists direct ownership of 384,941 shares of Rubico common stock, without reporting any new purchases, sales, or option exercises in this submission.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider HRT FINANCIAL LP

Role 10% Owner

Type	Security	Shares	Price	Value
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 384,941 shares (Direct)

Key Figures

Common stock owned: 384,941 shares Ownership status: Ten percent owner Reported security: Common Stock

3 metrics

Common stock owned 384,941 shares Direct ownership reported on Form 3

Ownership status Ten percent owner Reporting person classification on Form 3

Reported security Common Stock Class of Rubico Inc. securities held

Key Terms

ten percent owner, Common Stock, Form 3

3 terms

ten percent owner financial

"is_ten_percent_owner": 1"

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 3 regulatory

"INSIDER FILING DATA (Form 3)"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

FAQ

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

What does HRT FINANCIAL LP report in this Form 3 for RUBI?

HRT FINANCIAL LP reports its initial ownership position in Rubico Inc. common stock. The filing states direct ownership of 384,941 shares, classifying HRT FINANCIAL LP as a ten percent owner, with no new transactions such as purchases or sales reported in this document.

How many Rubico Inc. (RUBI) shares does HRT FINANCIAL LP own?

HRT FINANCIAL LP reports direct ownership of 384,941 shares of Rubico Inc. common stock. This total reflects its holdings following the reported position and is disclosed without any accompanying buy or sell transactions in the same filing.

Is HRT FINANCIAL LP a ten percent owner of Rubico Inc. (RUBI)?

Yes, HRT FINANCIAL LP is identified as a ten percent owner of Rubico Inc. common stock. This status is indicated in the Form 3 and is supported by its reported direct holdings of 384,941 shares in the issuer’s common stock.

Does this Rubico Inc. (RUBI) Form 3 show any insider buying or selling?

No, the Form 3 does not show insider buying or selling activity. It functions as an initial ownership report, listing HRT FINANCIAL LP’s direct holdings of 384,941 Rubico Inc. common shares, with no transaction prices or share changes disclosed.

What type of security does HRT FINANCIAL LP hold in Rubico Inc. (RUBI)?

HRT FINANCIAL LP holds Rubico Inc. common stock according to the Form 3. The filing specifies ownership of 384,941 shares of this common stock class, reported as a direct ownership position without associated derivative securities in the same document.

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

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Accepted by SEC EDGAR 06/16/2026 - 09:56 AM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

HRT FINANCIAL LP

(Last) (First) (Middle)

3 WORLD TRADE CENTER, 175 GREENWICH STRE

76TH FLOOR

(Street)

NEW YORK NEW YORK 10007

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
06/11/2026

3. Issuer Name and Ticker or Trading Symbol
Rubico Inc. [ RUBI ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	384,941	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	Adam Nunes	06/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)