Miami International director sells 3,000 shares

Miami International Holdings director Judson Gray Teekell sold 3,000 shares of common stock in an open-market transaction.

Rhea-AI Filing Summary

Miami International Holdings director Judson Gray Teekell sold 3,000 shares of common stock in an open-market transaction. The sale occurred on June 2, 2026 at a weighted average price of $42.78 per share. After this trade, he directly holds 71,014 shares. The transaction was executed under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025, meaning the sale was pre-scheduled rather than opportunistic. Trades were filled in multiple lots during the day at prices ranging from $41.53 to $43.99.

Insider Trade Summary 10b5-1

Net Seller: 3,000 shares

Net Sell 1 txn

Insider Teekell Judson Gray

Role Director

Sold 3,000 shs ($128K)

Type	Security	Shares	Price	Value
Sale	Common Stock	3,000	$42.78	$128K

Holdings After Transaction: Common Stock — 71,014 shares (Direct)

Footnotes (2)

1. F1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.
2. F2. This transaction was executed in multiple trades throughout the day at prices ranging from $41.53 to $43.99. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Key Figures

Shares sold: 3,000 shares Weighted average sale price: $42.78 per share Shareholding after transaction: 71,014 shares +2 more

5 metrics

Shares sold 3,000 shares Open-market sale of common stock on June 2, 2026

Weighted average sale price $42.78 per share Average price for 3,000 shares sold on June 2, 2026

Shareholding after transaction 71,014 shares Direct ownership following June 2, 2026 sale

Intraday sale price range $41.53–$43.99 per share Range of prices across multiple trades on sale date

Rule 10b5-1 plan adoption date December 17, 2025 Date director adopted trading plan used for this sale

Key Terms

Rule 10b5-1 Plan, weighted average sales price, open-market sale, Form 4

4 terms

Rule 10b5-1 Plan regulatory

"This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

weighted average sales price financial

"The price reported above reflects the weighted average sales price"

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.

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.

FAQ

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

What insider transaction did MIAX director Judson Gray Teekell report?

Judson Gray Teekell reported selling 3,000 shares of Miami International Holdings common stock. The transaction was an open-market sale executed on June 2, 2026 at a weighted average price of $42.78 per share.

How many MIAX shares did the director sell and at what price?

He sold 3,000 shares of Miami International Holdings common stock at a weighted average price of $42.78. Footnotes state the trades occurred in multiple lots between $41.53 and $43.99 throughout the trading day.

How many MIAX shares does the director own after this sale?

After the reported sale, Judson Gray Teekell directly owns 71,014 shares of Miami International Holdings common stock. This figure reflects his holdings immediately following the June 2, 2026 open-market transaction disclosed in the Form 4.

Was the MIAX insider sale made under a Rule 10b5-1 plan?

Yes. The filing states the transaction was effected under a previously established Rule 10b5-1 Plan adopted on December 17, 2025. Such plans pre-schedule trades, suggesting the timing of this 3,000-share sale was set in advance.

What type of transaction code appears in this MIAX Form 4 filing?

The Form 4 uses transaction code "S," indicating a sale in an open-market or private transaction. The filing further describes it as an open-market sale of common stock completed on June 2, 2026 under a Rule 10b5-1 Plan.

What price range did the MIAX director’s trades cover on the sale date?

According to the footnotes, the sale was executed in multiple trades at prices ranging from $41.53 to $43.99. The Form 4 reports a weighted average sales price of $42.78 per share for the 3,000 shares sold.

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

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Accepted by SEC EDGAR 06/04/2026 - 04:55 PM EDT Learn about SEC filing dates

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

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

X

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^*

Teekell Judson Gray

(Last) (First) (Middle)

C/O MIAMI INTERNATIONAL HOLDINGS, INC.

7 ROSZEL ROAD, SUITE 1A

(Street)

PRINCETON NEW JERSEY 08540

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MIAMI INTERNATIONAL HOLDINGS, INC. [ MIAX ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/02/2026

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	06/02/2026		S(1)		3,000	D	$42.78(2)	71,014	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:

1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

2. This transaction was executed in multiple trades throughout the day at prices ranging from $41.53 to $43.99. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Remarks:

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	06/04/2026
	** 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)