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

Role
Director
Signature
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact
Stock symbol
MIAX
Transactions as of
Aug 15, 2025
Transactions value $
$0
Form type
4
Date filed
8/19/2025, 04:07 PM
Previous filing
Aug 13, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
BROWN DAVID A Director C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 2025-08-19 0001394399

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -18.8K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 18.8K $16.14 Direct F1, F2
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +18.8K $0.00 18.8K Aug 15, 2025 Common Stock 18.8K $16.14 Direct F1, F2
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -7.5K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 7.5K $16.14 Direct F1, F2
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +7.5K $0.00 7.5K Aug 15, 2025 Common Stock 7.5K $16.14 Direct F1, F2
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -278 -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 278 $16.14 Direct F1, F2
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -278 -50% $0.00 278 Aug 15, 2025 Common Stock 278 $16.14 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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.
F2 The options are fully vested.