MIAX director receives stock unit awards

Massad Mark I. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Massad Mark I. reported acquisition or exercise transactions in this Form 4 filing.

MIAMI INTERNATIONAL HOLDINGS, INC. director Mark I. Massad reported stock-based compensation awards. On June 16, 2026, he received 4,970 restricted stock units that fully vested on the grant date, each representing one share of common stock. On June 15, 2026, he received 2,267 restricted stock units that vest immediately before the 2027 annual meeting of stockholders, subject to his continued service. Following these awards, he directly holds 10,737 shares of common stock.

Insider Trade Summary

Grant/Award: 7,237 shares

Grant/Award 2 txns

Insider Massad Mark I.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	4,970	$0.00	$0.00
Grant/Award	Common Stock	2,267	$0.00	$0.00

Holdings After Transaction: Common Stock — 10,737 shares (Direct)

Footnotes (2)

1. F1. The amount represents restricted stock units ("RSUs") that fully vested on the date of grant. Each RSU represents a right to receive one share of the Issuer's common stock.
2. F2. The amount represents RSUs that vest on the last business day immediately preceding the 2027 annual meeting of stockholders, subject to the reporting person's continued service to the Issuer through the vesting date.

Key Figures

RSUs vested on grant: 4,970 shares RSUs vesting before 2027 meeting: 2,267 shares Holdings after June 16 award: 10,737 shares +2 more

5 metrics

RSUs vested on grant 4,970 shares Restricted stock units fully vested on June 16, 2026 grant date

RSUs vesting before 2027 meeting 2,267 shares Restricted stock units vest immediately before 2027 annual meeting

Holdings after June 16 award 10,737 shares Total common stock directly held following June 16, 2026 transaction

Holdings after June 15 award 5,767 shares Total common stock directly held following June 15, 2026 transaction

Grant transaction price $0.00 per share Compensation grants of restricted stock units, not open-market purchases

Key Terms

restricted stock units ("RSUs"), vested on the date of grant, annual meeting of stockholders, continued service

4 terms

restricted stock units ("RSUs") financial

"The amount represents restricted stock units ("RSUs") that fully vested on the date of grant."

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

vested on the date of grant financial

"RSUs that fully vested on the date of grant, each for one share of common stock."

annual meeting of stockholders financial

"RSUs that vest on the last business day immediately preceding the 2027 annual meeting of stockholders."

continued service financial

"RSUs vest subject to the reporting person's continued service to the Issuer through the vesting date."

FAQ

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

What did MIAX director Mark I. Massad report in his latest Form 4?

Mark I. Massad reported two stock-based compensation awards. He received fully vested restricted stock units and additional units that will vest before the 2027 annual meeting, increasing his direct holdings of MIAMI INTERNATIONAL HOLDINGS, INC. common stock to 10,737 shares.

How many MIAX shares did Mark I. Massad acquire through awards?

Massad acquired 4,970 restricted stock units that vested immediately and 2,267 restricted stock units that vest before the 2027 annual meeting. Each restricted stock unit represents one share of MIAMI INTERNATIONAL HOLDINGS, INC. common stock granted as compensation rather than open-market purchases.

What are the vesting terms of Mark I. Massad’s MIAX restricted stock units?

One grant of 4,970 restricted stock units fully vested on the grant date. A second grant of 2,267 restricted stock units will vest on the last business day immediately preceding the 2027 annual meeting, contingent on Massad’s continued service to MIAMI INTERNATIONAL HOLDINGS, INC.

How many MIAX shares does Mark I. Massad hold after these Form 4 transactions?

After these reported transactions, Massad directly holds 10,737 shares of MIAMI INTERNATIONAL HOLDINGS, INC. common stock. This figure reflects his position following the grant and vesting of the restricted stock units disclosed in the Form 4 filing data.

Were Mark I. Massad’s MIAX share acquisitions open-market purchases?

No, the acquisitions reflect stock-based compensation awards. The Form 4 shows transaction code "A" for grants or awards of restricted stock units, with a transaction price of $0.00 per share, rather than open-market buy transactions at a stated market price.

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

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Accepted by SEC EDGAR 06/17/2026 - 04:33 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).

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^*

Massad Mark I.

(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)
06/15/2026

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	06/15/2026		A		2,267(1)	A	$0	5,767	D
Common Stock	06/16/2026		A		4,970(2)	A	$0	10,737	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. The amount represents restricted stock units ("RSUs") that fully vested on the date of grant. Each RSU represents a right to receive one share of the Issuer's common stock.

2. The amount represents RSUs that vest on the last business day immediately preceding the 2027 annual meeting of stockholders, subject to the reporting person's continued service to the Issuer through the vesting date.

Remarks:

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	06/17/2026
	** 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)