David A. Brown - 15 Aug 2025 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Reporting relationship: Director
Issuer ticker: MIAX
Reported as of: 15 Aug 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 19 Aug 2025, 16:07:04 UTC
Prior SEC filing: 13 Aug 2025
Next SEC filing: 07 May 2026
Source filing: View source filing
Reporting owner signature: /s/Alessandra Maria Corona Henriques, Attorney-in-Fact

Filing notes and source

Key filing fact

David A. Brown filed Form 4 for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) on 19 Aug 2025.

Key facts

This page summarizes David A. Brown's Form 4 filing for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
6 reported transactions and 6 derivative rows are listed below.
Accepted by SEC: 19 Aug 2025, 16:07.

Change

Previous filing in this sequence was filed on 13 Aug 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001394399 Primary reporting owner

BROWN DAVID A

Relationship: Director
Address: C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON
Signature: /s/Alessandra Maria Corona Henriques, Attorney-in-Fact
Signature date: 19 Aug 2025

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -18,750
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 18,750
Exercise price: $16.14
Footnotes: F1, F2

MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: +18,750
Change %
Price: $0.000000
Shares after: 18,750
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 18,750
Exercise price: $16.14
Footnotes: F1, F2

MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -7,500
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 7,500
Exercise price: $16.14
Footnotes: F1, F2

MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: +7,500
Change %
Price: $0.000000
Shares after: 7,500
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,500
Exercise price: $16.14
Footnotes: F1, F2

MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -278
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 278
Exercise price: $16.14
Footnotes: F1, F2

MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -278
Change %: -50%
Price: $0.000000
Shares after: 278
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 278
Exercise price: $16.14
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the initial public offering, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions.

Footnote F2

The options are fully vested.