MIAMI International director exercises stock options

MIAMI INTERNATIONAL HOLDINGS director Paul Stahlin exercised stock options and had shares withheld for taxes.

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Form Type

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS director Paul Stahlin exercised stock options and had shares withheld for taxes. He exercised a total of 11,000 stock options at $12.00 per share into common stock on June 9 and June 11, 2026. To cover the option exercise costs and related taxes, 1,177 shares of common stock were withheld by the company, which the filing states does not represent a market sale by Stahlin. After the tax-withholding transaction, he held 34,906 common shares directly.

Insider Trade Summary

11,000 shares exercised/converted

Exercise 5 txns

Insider Stahlin Paul

Role Director

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy)	4,000	$0.00	$0.00
Exercise	Common Stock	4,000	$12.00	$48K
Exercise Price or Tax Liability	Common Stock	1,177	$40.79	$48K
Exercise	Stock Option (Right to Buy)	7,000	$0.00	$0.00
Exercise	Common Stock	7,000	$12.00	$84K

Holdings After Transaction: Stock Option (Right to Buy) — 0 contracts (Direct); Common Stock — 34,906 shares (Direct)

Footnotes (2)

F1. Represents shares that have been withheld by the Issuer to cover the exercise price of the options exercised and does not represent a sale by the Reporting Person.
F2. The options are fully vested.

Key Figures

Options exercised: 11,000 shares Exercise price: $12.00/share Shares withheld: 1,177 shares +3 more

6 metrics

Options exercised 11,000 shares Stock options exercised into common stock on June 9 and 11, 2026

Exercise price $12.00/share Conversion or exercise price for stock options exercised

Shares withheld 1,177 shares Shares withheld by issuer for exercise price and tax liabilities

Holdings after tax withholding 34,906 shares Common stock held directly following tax-withholding transaction

Non-derivative acquisition 2026-06-09 7,000 shares Common stock acquired via option exercise on June 9, 2026

Non-derivative acquisition 2026-06-11 4,000 shares Common stock acquired via option exercise on June 11, 2026

Key Terms

tax-withholding disposition, derivative exercise/conversion, Stock Option (Right to Buy), fully vested

4 terms

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition" for the F-coded entry"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

derivative exercise/conversion financial

"transaction_action: "derivative exercise/conversion" for M-coded entries"

Stock Option (Right to Buy) financial

"security_title: "Stock Option (Right to Buy)" in derivative records"

fully vested financial

"footnote: "The options are fully vested.""

FAQ

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

What did MIAX director Paul Stahlin report in his latest Form 4?

Paul Stahlin reported exercising stock options for 11,000 MIAX common shares at $12.00 per share. The filing also shows shares withheld by the company to cover the option exercise price and taxes, rather than an open-market sale.

How many MIAX shares did Paul Stahlin acquire through option exercises?

Stahlin acquired 11,000 MIAX common shares through option exercises. These came from exercising stock options labeled as a "Stock Option (Right to Buy)" at a conversion or exercise price of $12.00 per share on two transaction dates.

Were any of Paul Stahlin’s MIAX transactions open-market sales?

The Form 4 indicates no open-market sales. A transaction coded "F" for 1,177 shares is described as shares withheld by the issuer to cover the option exercise price and taxes, and the filing notes this does not represent a sale by Stahlin.

How many MIAX shares were withheld for taxes and exercise costs?

The filing shows 1,177 MIAX common shares withheld. These shares were retained by the issuer to cover the exercise price and related tax obligations tied to the option exercises, rather than being sold into the market by the reporting person.

What are Paul Stahlin’s MIAX common stock holdings after these transactions?

After the tax-withholding disposition, Stahlin is shown holding 34,906 MIAX common shares directly. This figure comes from the transaction record associated with the shares withheld to cover the option exercise price and tax liabilities.

What happened to Paul Stahlin’s MIAX stock options in this Form 4?

The Form 4 shows exercises of stock options labeled "Stock Option (Right to Buy)" covering 11,000 underlying shares at $12.00 per share. Following these exercises, the option position reported in the derivative table was reduced to zero shares.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 06/11/2026 - 04:42 PM EDT

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)
06/09/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/09/2026		M		7,000	A	$12	32,083	D
Common Stock	06/11/2026		M		4,000	A	$12	36,083	D
Common Stock	06/11/2026		F⁽¹⁾		1,177	D	$40.79	34,906	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (Right to Buy)	$12	06/09/2026		M			7,000	⁽²⁾	06/19/2026	Common Stock	7,000	$0	4,000	D
Stock Option (Right to Buy)	$12	06/11/2026		M			4,000	⁽²⁾	06/19/2026	Common Stock	4,000	$0	0	D

Explanation of Responses:

1. Represents shares that have been withheld by the Issuer to cover the exercise price of the options exercised and does not represent a sale by the Reporting Person.

2. The options are fully vested.

Remarks:

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	06/11/2026
	** 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)

Source: View Original Filing on SEC EDGAR