STOCK TITAN

Miami International Holdings (MIAX) director uses 171 shares to cover RSU taxes

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. director David A. Brown surrendered 171 shares of common stock on July 8, 2026 to cover tax withholding tied to the net settlement of restricted stock units. This was not an open-market sale. After this tax-withholding disposition, he directly holds 7,066 shares of common stock.

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Insider BROWN DAVID A
Role Director
Type Security Shares Price Value
Exercise Price or Tax Liability Common Stock 171 $43.72 $7K
Holdings After Transaction: Common Stock — 7,066 shares (Direct)
Footnotes (1)
  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 units and does not represent a sale by the Reporting Person.
Shares surrendered for taxes 171 shares Tax withholding on restricted stock units on July 8, 2026
Implied share value $43.72 per share Value used for 171-share tax-withholding disposition
Shares held after transaction 7,066 shares Direct MIAX common stock ownership following Form 4 transaction
restricted stock units financial
"in connection with the net settlement of restricted stock units and does not represent a sale"
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.
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.
net settlement financial
"in connection with the net settlement of restricted stock units and does not represent a sale"
Form 4 regulatory
"INSIDER FILING DATA (Form 4):"
Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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

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FAQ

What insider transaction did MIAX director David A. Brown report?

David A. Brown reported surrendering 171 shares of MIAX common stock to the company to cover tax withholding on restricted stock units. This is a tax-related share disposition, not an open-market trade or discretionary sale.

Was David A. Brown’s MIAX transaction an open-market sale of shares?

No, the filing states the 171 shares were surrendered to the company solely to satisfy tax withholding and remittance obligations on restricted stock units. The footnote clarifies it does not represent a sale by the reporting person.

How many MIAX shares does David A. Brown hold after this Form 4 filing?

Following the tax-withholding disposition, David A. Brown directly holds 7,066 shares of MIAX common stock. This remaining position is reported in the Form 4 as his total direct ownership after the July 8, 2026 transaction.

What was the implied price per share in David A. Brown’s MIAX tax withholding?

The Form 4 shows an implied price of $43.72 per MIAX share for the 171 shares surrendered. This figure is used solely for reporting the value of shares applied to satisfy the tax obligation on restricted stock units.

Does the MIAX Form 4 show any option exercises or derivative transactions?

No, this Form 4 only reports a non-derivative transaction where 171 common shares were surrendered for tax withholding. The derivativeSummary section is empty, indicating no option exercises or other derivative activities in this filing.
SEC Form 4
FORM 4UNITED 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*
BROWN DAVID A

(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
07/08/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock07/08/2026F171(1)D$43.727,066D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 units and does not represent a sale by the Reporting Person.
Remarks:
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact07/09/2026
** Signature of Reporting PersonDate
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)