HRT Financial LP, a 10% Rubico (RUBI) holder, buys then fully sells shares

Rhea-AI Filing Summary

Rubico Inc. disclosed that major shareholder HRT Financial LP, identified as a ten percent owner, reported mixed trading in its common stock. On June 11, HRT Financial LP made an open-market purchase of 484,963 shares at $0.812 per share. On June 12, it executed an open-market sale of 551,020 shares at $0.954 per share, resulting in a reported holding of 0 shares of Rubico common stock after the sale.

Positive

• None.

Negative

• Ten percent owner reports full exit: HRT Financial LP, identified as a ten percent owner of Rubico Inc., reported open-market trades that resulted in its Rubico common stock holdings declining to 0 shares.

Insights

Equity market structure analyst

Large holder trades around position then fully exits Rubico stake.

HRT Financial LP, listed as a ten percent owner of Rubico Inc., reported one open-market purchase followed by a larger open-market sale of Rubico common stock. The net result was a reduction of its reported Rubico holdings to zero shares.

The filing shows a purchase of 484,963 shares at $0.812 on June 11, then a sale of 551,020 shares at $0.954 on June 12. Net activity across these trades was a disposition of 66,057 shares, and the position reported after the sale was 0 shares.

Because HRT Financial LP is described as a ten percent owner, a full exit from its reported position can be meaningful for investors assessing Rubico’s shareholder base. Subsequent company filings may provide additional context on any further ownership changes by other large holders.

Insider Trade Summary

Net Seller: 66,057 shares ($525,673)

Net Sell 2 txns

Insider HRT FINANCIAL LP

Role null

Bought 484,963 shs ($394K)

Sold 551,020 shs ($526K)

Type	Security	Shares	Price	Value
Sale	Common Stock	551,020	$0.954	$526K
Purchase	Common Stock	484,963	$0.812	$394K

Holdings After Transaction: Common Stock — 0 shares (Direct, null)

Footnotes (1)

Key Figures

Shares purchased: 484,963 shares Purchase price: $0.812 per share Shares sold: 551,020 shares +3 more

6 metrics

Shares purchased 484,963 shares Open-market purchase of Rubico common stock on June 11

Purchase price $0.812 per share Price for June 11 Rubico common stock purchase

Shares sold 551,020 shares Open-market sale of Rubico common stock on June 12

Sale price $0.954 per share Price for June 12 Rubico common stock sale

Net shares disposed 66,057 shares Net of buy and sell across June 11–12 transactions

Shares after transactions 0 shares Total Rubico common stock held after June 12 sale

Key Terms

open-market sale, open-market purchase, ten percent owner, Form 4

4 terms

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

open-market purchase financial

"transaction_action": "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

ten percent owner financial

"is_ten_percent_owner": 1"

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/11/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/11/2026		P		484,963	A	$0.812	384,941	D
Common Stock	06/12/2026		S		551,020	D	$0.954	0	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	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 4 (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 4: SEC 1474 (03-26)

FAQ

What insider transactions did HRT Financial LP report for Rubico Inc. (RUBI)?

HRT Financial LP reported two Rubico Inc. transactions: buying 484,963 common shares at $0.812 on June 11, then selling 551,020 shares at $0.954 on June 12. These open-market trades left the reporting holder with zero Rubico common shares afterward.

Did HRT Financial LP increase or decrease its Rubico Inc. (RUBI) holdings?

HRT Financial LP decreased its Rubico Inc. holdings overall. It first bought 484,963 shares, then sold 551,020 shares, a net disposition of 66,057 shares. After the June 12 sale, its reported Rubico common stock balance was zero shares.

At what prices did HRT Financial LP trade Rubico Inc. (RUBI) shares?

HRT Financial LP bought Rubico Inc. common stock at $0.812 per share on June 11 and sold shares at $0.954 per share on June 12. Both trades were reported as open-market or private transactions in Rubico common stock.

What is HRT Financial LP’s ownership status in Rubico Inc. (RUBI) after these trades?

Following the June 12 sale, HRT Financial LP reported holding zero shares of Rubico Inc. common stock. Before these trades, it was identified as a ten percent owner, so the filing reflects a complete exit of its reported Rubico equity position.

Were HRT Financial LP’s Rubico Inc. (RUBI) trades open-market transactions?

Yes. The Form 4 classifies the June 11 activity as an open-market purchase and the June 12 activity as an open-market sale. Both transactions involved Rubico Inc. common stock and were reported using standard open-market or private transaction codes.