MIAMI International director trades 5,625 shares

MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert exercised stock options for 5,625 shares of Common Stock at $12.00 per share and on the same day sold 5,625 shares in an open-market transaction.

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert exercised stock options for 5,625 shares of Common Stock at $12.00 per share and on the same day sold 5,625 shares in an open-market transaction.

The sale was executed at a weighted average price of $47.29 per share, with individual trades ranging from $47.09 to $47.53, under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025. After these transactions, he holds 142,375 shares of Common Stock directly and 11,563 fully vested stock options expiring on May 31, 2027.

Insider Trade Summary 10b5-1

Exercise and Sale: 5,625 shares ($199K approx. pre-tax spread)

Exercise and Sale 3 txns

Insider Eckert Kurt M.

Role Director

Sold 5,625 shs ($266K)

Approx. gross sale proceeds $266K

Approx. exercise cost $68K

Approx. pre-tax spread $199K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy)	5,625	$0.00	$0.00
Exercise	Common Stock	5,625	$12.00	$68K
Sale	Common Stock	5,625	$47.29	$266K

Holdings After Transaction: Stock Option (Right to Buy) — 11,563 contracts (Direct); Common Stock — 142,375 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 $47.09 to $47.53. The price reported above reflects the weighted average sale 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

Shares sold: 5,625 shares Weighted average sale price: $47.29 per share Option exercise price: $12.00 per share +4 more

7 metrics

Shares sold 5,625 shares Open-market sale of Common Stock on May 4, 2026

Weighted average sale price $47.29 per share Open-market sale range $47.09–$47.53

Option exercise price $12.00 per share Exercise of 5,625 stock options into Common Stock

Shares held after 142,375 shares Common Stock directly owned following transactions

Options remaining 11,563 options Stock options outstanding after exercise, fully vested

Option expiration May 31, 2027 Expiry date of remaining stock options

Net share change -5,625 shares Net sell shares from transaction summary

Key Terms

Rule 10b5-1 Plan, weighted average sale price, Stock Option (Right to Buy), derivative security

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 sale price financial

"The price reported above reflects the weighted average sale price."

Stock Option (Right to Buy) financial

"security_title: Stock Option (Right to Buy)"

derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

FAQ

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

What did MIAX director Kurt M. Eckert do in this Form 4 filing?

Kurt M. Eckert exercised options and sold shares of MIAX stock. He exercised 5,625 stock options at $12.00 per share and sold 5,625 Common Stock shares in the open market at a weighted average price of $47.29 per share.

At what prices were the MIAX shares sold in Kurt Eckert’s transaction?

The MIAX shares were sold at a weighted average of $47.29 per share. Individual trades during the day occurred at prices ranging from $47.09 to $47.53, reflecting multiple executions rather than a single sale price.

Was Kurt M. Eckert’s MIAX stock sale under a Rule 10b5-1 plan?

Yes, the MIAX stock sale was made under a Rule 10b5-1 plan. The filing states the transaction was effected pursuant to a previously established Rule 10b5-1 trading plan adopted by Kurt M. Eckert on December 18, 2025.

How many MIAX shares does Kurt Eckert hold after this Form 4 transaction?

After the transaction, Kurt Eckert directly holds 142,375 MIAX Common shares. In addition, he holds 11,563 fully vested stock options, giving him further potential equity exposure if those options are exercised before expiration.

What stock options related to MIAX does Kurt Eckert retain after exercising some?

Kurt Eckert retains 11,563 MIAX stock options after this exercise. These options are fully vested, have a conversion or exercise price of $12.00 per share, and are scheduled to expire on May 31, 2027, according to the Form 4 details.

How many MIAX shares did Kurt Eckert sell in this open-market transaction?

Kurt Eckert sold 5,625 shares of MIAX Common Stock. The filing classifies this as an open-market sale, coded “S,” with sales executed across multiple trades and reported using a weighted average price of $47.29 per share.

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

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Accepted by SEC EDGAR 05/05/2026 - 07:31 AM 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^*

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)
05/04/2026

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	05/04/2026		M(1)		5,625	A	$12	148,000	D
Common Stock	05/04/2026		S(1)		5,625	D	$47.29(2)	142,375	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	05/04/2026		M(1)			5,625	(3)	05/31/2027	Common Stock	5,625	$0	11,563	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 $47.09 to $47.53. The price reported above reflects the weighted average sale 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	05/05/2026
	** 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)