MIAX director granted additional stock units

Stahlin Paul reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Stahlin Paul reported acquisition or exercise transactions in this Form 4 filing.

MIAMI INTERNATIONAL HOLDINGS, INC. director Paul Stahlin reported two equity awards of common stock. He received 4,970 restricted stock units that fully vested on the grant date and 2,267 RSUs that will vest on the last business day before the 2027 annual stockholders’ meeting, subject to continued service. Following these awards, he directly holds 42,143 common shares.

Insider Trade Summary

Grant/Award: 7,237 shares

Grant/Award 2 txns

Insider Stahlin Paul

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 — 42,143 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

Immediately vested RSUs: 4,970 units Deferred vesting RSUs: 2,267 units Holdings after latest grant: 42,143 shares +3 more

6 metrics

Immediately vested RSUs 4,970 units Restricted stock units that fully vested on grant date

Deferred vesting RSUs 2,267 units RSUs vesting before the 2027 annual meeting

Holdings after latest grant 42,143 shares Common stock directly owned following 2026-06-16 grant

Transaction date (immediate vest grant) 2026-06-16 Grant of 4,970 RSUs that fully vested

Transaction date (deferred vest grant) 2026-06-15 Grant of 2,267 RSUs vesting before 2027 meeting

Price per share for grants 0.0000 per share No cash consideration for the awarded RSUs

Key Terms

restricted stock units, RSUs, annual meeting of stockholders, continued service

4 terms

restricted stock units financial

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

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

RSUs financial

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

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

annual meeting of stockholders financial

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

continued service financial

"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 insider transactions did MIAX director Paul Stahlin report on this Form 4?

Paul Stahlin reported two stock awards of MIAX common stock. He received 4,970 restricted stock units that vested immediately and 2,267 RSUs that will vest before the 2027 annual meeting, increasing his direct holdings to 42,143 shares.

How many MIAX shares does Paul Stahlin own after these reported grants?

After these grants, Paul Stahlin holds 42,143 MIAX common shares directly. This figure reflects the impact of both reported restricted stock unit awards on his ownership position as of the latest transaction date in the filing.

What are the terms of the immediately vested MIAX restricted stock units granted to Paul Stahlin?

One award consists of 4,970 restricted stock units that fully vested on the grant date. Each RSU represents the right to receive one share of MIAX common stock, effectively functioning as fully vested shares upon grant according to the filing.

When will Paul Stahlin’s second MIAX RSU grant vest?

The second award of 2,267 restricted stock units will vest on the last business day immediately preceding the 2027 annual meeting of stockholders. Vesting is conditioned on Stahlin’s continued service to MIAMI INTERNATIONAL HOLDINGS, INC. through that vesting date.

Are Paul Stahlin’s MIAX stock awards open-market purchases or compensation grants?

The filing classifies both transactions as awards or other acquisitions, not open-market purchases. They are restricted stock unit grants provided at no cash cost per share, reflecting equity-based compensation rather than market buying activity.

Does each MIAX RSU granted to Paul Stahlin equal one share of common stock?

Yes. The filing states that each restricted stock unit represents a right to receive one share of MIAX common stock. Once vested and settled, the RSUs convert into an equivalent number of common shares for the reporting person.

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

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Accepted by SEC EDGAR 06/17/2026 - 04:27 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^*

Stahlin Paul

(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	37,173	D
Common Stock	06/16/2026		A		4,970(2)	A	$0	42,143	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)