MIAX executive surrenders shares for tax withholding

MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel reported a routine share disposition related to taxes.

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Form Type

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel reported a routine share disposition related to taxes. On this Form 4, 5,939 shares of common stock were surrendered to the company at $40.79 per share to satisfy tax withholding and remittance obligations on restricted stock awards. This transaction is explicitly described as a tax-withholding mechanism and not a sale by the reporting person. After the withholding, Deitzel directly holds 110,282 shares of common stock.

Insider Trade Summary

Exercise Price or Tax Liability: 5,939 shares

Exercise Price or Tax Liability 1 txn

Insider Deitzel Edward

Role EVP, CRO, CCO MIAX Exchanges

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	5,939	$40.79	$242K

Holdings After Transaction: Common Stock — 110,282 shares (Direct)

Footnotes (1)

F1. 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.

Key Figures

Shares surrendered for taxes: 5,939 shares Valuation price per share: $40.79 per share Shares held after transaction: 110,282 shares

3 metrics

Shares surrendered for taxes 5,939 shares Tax-withholding disposition on restricted stock awards

Valuation price per share $40.79 per share Value used for surrendered common stock

Shares held after transaction 110,282 shares Direct MIAX common stock holdings after tax withholding

Key Terms

restricted stock awards, tax withholding, net settlement

3 terms

restricted stock awards financial

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

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.

tax withholding financial

"satisfy tax withholding and remittance obligations"

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.

net settlement financial

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

FAQ

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

What insider transaction did MIAX executive Edward Deitzel report on this Form 4?

Edward Deitzel reported surrendering 5,939 MIAX common shares to the company to cover tax withholding obligations on restricted stock awards. This was a tax-withholding disposition, not an open-market sale, and is a routine administrative transaction.

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

No, the transaction was not an open-market sale. The 5,939 shares were surrendered to MIAMI INTERNATIONAL HOLDINGS, INC. solely to satisfy tax withholding and remittance obligations tied to restricted stock awards granted to Edward Deitzel.

How many MIAX shares does Edward Deitzel hold after the reported tax-withholding transaction?

After surrendering shares for tax withholding, Edward Deitzel holds 110,282 shares of MIAX common stock directly. This figure reflects his position following the 5,939-share tax-withholding disposition reported in the Form 4 filing.

What was the price used for the MIAX shares surrendered for tax withholding?

The MIAX shares surrendered for tax withholding were valued at $40.79 per share. This price was applied to the 5,939 common shares surrendered to the company to cover Edward Deitzel’s tax obligations on restricted stock awards.

Why did MIAX executive Edward Deitzel surrender shares instead of paying cash taxes?

The filing states the shares were surrendered to satisfy tax withholding and remittance obligations on restricted stock awards. This net-settlement method allows taxes to be covered by delivering shares back to the company instead of using cash.

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

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Accepted by SEC EDGAR 06/12/2026 - 04:17 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^*

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)
06/11/2026

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	06/11/2026		F⁽¹⁾		5,939	D	$40.79	110,282	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)

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	06/12/2026
	** 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