Miami International (MIAX) director sells 1,063 shares, exercises options

Rhea-AI Filing Summary

Miami International Holdings director Kurt M. Eckert exercised stock options for 1,063 shares of Common Stock at $12.00 per share on August 4, 2026, then sold 1,063 shares at a weighted average price of $45.80 per share. The options were fully vested and this grant was exhausted, with transactions effected under a Rule 10b5-1 Plan adopted on December 18, 2025.

Insider Trade Summary 10b5-1

Exercise and Sale: 1,063 shares ($36K approx. pre-tax spread)

Exercise and Sale 3 txns

Insider Eckert Kurt M.

Role Director

Sold 1,063 shs ($49K)

Approx. gross sale proceeds $49K

Approx. exercise cost $13K

Approx. pre-tax spread $36K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy) F1, F3	1,063	$0.00	$0.00
Exercise	Common Stock F1	1,063	$12.00	$13K
Sale	Common Stock F1, F2	1,063	$45.80	$49K

Holdings After Transaction: Stock Option (Right to Buy) — 0 shares (Direct); Common Stock — 149,612 shares (Direct)

Footnotes (3)

1. F1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.
2. F2. This transaction was executed in multiple trades throughout the day at prices ranging from $45.14 to $46.57. 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.
3. F3. The options are fully vested

Key Figures

Options exercised: 1,063 shares Exercise price: $12.00 per share Shares sold: 1,063 shares +4 more

7 metrics

Options exercised 1,063 shares Stock options for Common Stock exercised on August 4, 2026

Exercise price $12.00 per share Conversion or exercise price of the stock options

Shares sold 1,063 shares Common Stock sold on August 4, 2026

Weighted average sale price $45.80 per share Sale executed in multiple trades between $45.14 and $46.57

Option expiration date May 31, 2027 Expiration date of the exercised stock options before exercise

Rule 10b5-1 plan adoption date December 18, 2025 Date the trading plan governing these transactions was adopted

Options remaining from this grant 0 shares Derivative position following the reported exercise

Key Terms

Rule 10b5-1 Plan, weighted average sales price, Stock Option (Right to Buy), fully vested

4 terms

Rule 10b5-1 Plan regulatory

"This transaction was effected pursuant to a previously established Rule 10b5-1 Plan"

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"

Stock Option (Right to Buy) financial

"Security title is listed as Stock Option (Right to Buy)"

fully vested financial

"The options are fully vested"

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/06/2026 - 04:13 PM Accepted by SEC EDGAR 08/06/2026 - 04:11 PM Learn about SEC filing dates

FAQ

What did MIAX director Kurt M. Eckert do in this reported transaction?

Kurt M. Eckert exercised 1,063 stock options at $12.00 per share, receiving 1,063 shares of Miami International Common Stock, and then sold those 1,063 shares at a weighted average price of $45.80 on August 4, 2026.

How many MIAX shares were sold and at what price?

The report shows a sale of 1,063 shares of Miami International Common Stock at a weighted average price of $45.80 per share, executed in multiple trades at prices ranging from $45.14 to $46.57 on August 4, 2026.

At what price were the MIAX options exercised by the director?

Kurt M. Eckert exercised stock options for 1,063 shares of Miami International Common Stock at an exercise price of $12.00 per share. These options were fully vested and carried an original expiration date of May 31, 2027.

Were the MIAX share sales by the director under a Rule 10b5-1 plan?

Yes. The transactions were effected under a Rule 10b5-1 Plan that Kurt M. Eckert adopted on December 18, 2025, indicating the trades followed a pre-established trading arrangement rather than being made on an ad hoc basis.

Did the MIAX director retain any options from this specific grant after the transaction?

No options from this specific grant remained. After exercising 1,063 options for 1,063 shares of Common Stock, the derivative position for this option award is reported as 0 shares, and the options are described as fully vested.

What is the net share effect of the MIAX director’s reported trades?

The director exercised 1,063 options to acquire 1,063 shares and then sold 1,063 shares, resulting in a net reported sale of 1,063 shares for this sequence. The transaction summary characterizes the activity as net-sell of that amount.

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^*

Eckert Kurt M.

(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)
08/04/2026

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	08/04/2026		M(1)		1,063	A	$12	150,675	D
Common Stock	08/04/2026		S(1)		1,063	D	$45.8(2)	149,612	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
Stock Option (Right to Buy)	$12	08/04/2026		M(1)			1,063	(3)	05/31/2027	Common Stock	1,063	$0	0	D

Explanation of Responses:

1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

2. This transaction was executed in multiple trades throughout the day at prices ranging from $45.14 to $46.57. 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.

3. The options are fully vested

Remarks:

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	08/06/2026
	** 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)