MIAX (MIAX) EVP exercises options and sells 16,000 common shares

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown, EVP and Chief Strategy Officer, reported an exercise-and-sale transaction in company common stock. Brown exercised options to acquire 16,000 shares at $12.00 per share and sold 16,000 shares at a weighted average price of $42.12 per share.

The sale was executed in multiple trades on June 2, 2026 under a previously established Rule 10b5-1 trading plan adopted on December 22, 2025. Following these transactions, Brown directly holds 325,047 shares of MIAX common stock.

Insider Trade Summary 10b5-1

Net Seller: 16,000 shares ($673,920)

Net Sell 3 txns

Insider Brown Shelly

Role EVP, Chief Strategy Officer

Sold 16,000 shs ($674K)

Type	Security	Shares	Price	Value
Exercise	Nonqualified Stock Option (Right to Buy)	16,000	$0.00	--
Exercise	Common Stock	16,000	$12.00	$192K
Sale	Common Stock	16,000	$42.12	$674K

Holdings After Transaction: Nonqualified Stock Option (Right to Buy) — 16,000 shares (Direct, null); Common Stock — 341,047 shares (Direct, null)

Footnotes (1)

1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 22, 2025. This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $45.73. 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. The options are fully vested.

Key Figures

Shares sold: 16,000 shares Weighted average sale price: $42.12 per share Option exercise price: $12.00 per share +3 more

6 metrics

Shares sold 16,000 shares Open-market sale of common stock on June 2, 2026

Weighted average sale price $42.12 per share Common stock sale on June 2, 2026

Option exercise price $12.00 per share Nonqualified stock option exercise for 16,000 shares

Options exercised 16,000 shares Nonqualified stock option (right to buy) exercised

Post-transaction holdings 325,047 shares Common stock directly held after transactions

Sale price range $42.00–$45.73 per share Price range for multiple trades on June 2, 2026

Key Terms

Rule 10b5-1 Plan, Nonqualified Stock Option, weighted average sales price, 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.

Nonqualified Stock Option financial

"Nonqualified Stock Option (Right to Buy)"

weighted average sales price financial

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

derivative security financial

"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.

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Form 4 Insider Transactions: What Each Field Means →

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^*

Brown Shelly

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Strategy Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/02/2026

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	06/02/2026		M(1)		16,000	A	$12	341,047	D
Common Stock	06/02/2026		S(1)		16,000	D	$42.12(2)	325,047	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
Nonqualified Stock Option (Right to Buy)	$12	06/02/2026		M(1)			16,000	(3)	08/02/2026	Common Stock	16,000	$0	16,000	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 22, 2025.

2. This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $45.73. 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	06/04/2026
	** 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)

FAQ

What insider transaction did MIAX executive Shelly Brown report on Form 4?

Shelly Brown reported exercising options for 16,000 MIAX shares at $12.00 and selling 16,000 shares at a weighted average of $42.12. These trades occurred on June 2, 2026 and involved MIAMI INTERNATIONAL HOLDINGS, INC. common stock.

How many MIAX shares did Shelly Brown sell and at what price?

Shelly Brown sold 16,000 shares of MIAX common stock at a weighted average price of $42.12 per share. The sale occurred in multiple trades, with prices ranging from $42.00 to $45.73 during the trading day.

What stock options did Shelly Brown exercise in this MIAX Form 4 filing?

Brown exercised a nonqualified stock option for 16,000 shares of MIAX common stock at an exercise price of $12.00 per share. The options were fully vested and were exercised on June 2, 2026, ahead of their stated expiration on August 2, 2026.

How many MIAX shares does Shelly Brown hold after the reported transactions?

After the reported exercise and sale, Shelly Brown directly holds 325,047 shares of MIAX common stock. This post-transaction holding reflects her remaining equity position following the 16,000-share open-market sale disclosed in the Form 4 filing.

Were Shelly Brown’s MIAX stock sales made under a Rule 10b5-1 plan?

Yes. The Form 4 footnotes state that the sale was executed under a previously established Rule 10b5-1 trading plan adopted on December 22, 2025. Such plans pre-schedule trades, indicating the timing was pre-arranged rather than discretionary.