MIAX (MIAX) EVP uses 707 shares to cover tax withholding

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel, EVP, CRO and CCO of MIAX Exchanges, reported a routine tax-related share disposition. On March 30, 2026, 707 shares of common stock at $37.50 per share were surrendered to the company solely to cover tax withholding on vested restricted stock awards.

The footnote explains this transaction does not represent an open-market sale by Deitzel. After this tax-withholding event, he directly holds 116,221 shares of MIAX common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Deitzel Edward

Role EVP, CRO, CCO MIAX Exchanges

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	707	$37.50	$27K

Holdings After Transaction: Common Stock — 116,221 shares (Direct)

Footnotes (1)

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Key Figures

Tax-withholding shares: 707 shares Price per share: $37.50 per share Shares held after transaction: 116,221 shares

3 metrics

Tax-withholding shares 707 shares Common stock surrendered for tax withholding on Mar. 30, 2026

Price per share $37.50 per share Value used for the 707 surrendered shares

Shares held after transaction 116,221 shares Direct MIAX common stock holdings following the Form 4 event

Key Terms

tax withholding, restricted stock awards, net settlement

3 terms

tax withholding financial

"satisfy tax withholding and remittance obligations in connection with the net settlement"

Tax withholding is the practice of taking a portion of a payment—such as wages, dividends, or sale proceeds—before it reaches the recipient and sending that portion to the tax authority as an advance on the recipient’s eventual tax bill. For investors it matters because withholding reduces immediate cash received and affects after‑tax returns, estimated tax payments, and whether you may owe more or receive a refund when taxes are finally calculated, like having a small automatic savings set aside for your tax bill.

restricted stock awards financial

"net settlement of restricted stock awards and does not represent a sale"

Restricted stock awards are company shares given to employees or executives that cannot be sold or transferred until certain conditions — like staying with the company for a set time or meeting performance targets — are met, like a gift that is locked in a safe until rules are satisfied. Investors care because these awards tie management’s pay to company performance, can increase the number of shares outstanding when they become tradable (dilution), and may signal expected future selling pressure or commitment to long-term growth.

net settlement financial

"in connection with the net settlement of restricted stock awards"

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).

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^*

Deitzel Edward

(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, CRO, CCO MIAX Exchanges

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/30/2026

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	03/30/2026		F		707(1)	D	$37.5	116,221	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. Represents shares that have been surrendered to the Company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards and does not represent a sale by the reporting person.

Remarks:

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	04/01/2026
	** 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 Edward Deitzel report?

Edward Deitzel reported a tax-related share disposition. He surrendered 707 MIAMI INTERNATIONAL HOLDINGS (MIAX) common shares to the company to satisfy tax withholding on restricted stock awards, rather than selling them on the open market.

Was the MIAX Form 4 transaction an open-market sale of shares?

No, the transaction was not an open-market sale. The 707 MIAX shares were surrendered back to the company to cover tax withholding and remittance obligations on restricted stock awards, as explicitly stated in the footnote.

How many MIAX shares did Edward Deitzel surrender for tax withholding?

He surrendered 707 MIAX common shares. These shares were valued at $37.50 per share and were used solely to satisfy tax obligations related to the net settlement of restricted stock awards, according to the Form 4 disclosure.

What is Edward Deitzel’s MIAX share ownership after this Form 4 transaction?

After the transaction, Edward Deitzel directly holds 116,221 MIAX shares. This figure reflects his remaining common stock position following the surrender of 707 shares for tax withholding purposes disclosed in the Form 4.

What role does Edward Deitzel hold at MIAMI INTERNATIONAL HOLDINGS (MIAX)?

Edward Deitzel serves as EVP, CRO and CCO of MIAX Exchanges. His Form 4 identifies him as an executive officer with these titles while reporting the tax-withholding disposition of MIAX common stock.