Paul Stahlin - 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, 04:08 PM
Previous filing
Aug 15, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Stahlin Paul Director C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 2025-08-19 0001764337

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Conversion of derivative security +10K +66.3% 25.1K Aug 15, 2025 Direct F1, F2
transaction MIAX Common Stock Conversion of derivative security +14.1K +128.03% 25.1K Aug 15, 2025 Direct F1, F2

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 Series B Preferred Stock Conversion of derivative security $0 -10K -100% $0.00 0 Aug 15, 2025 Common Stock 10K Direct F1
transaction MIAX Nonvoting Common Stock Conversion of derivative security $0 -14.1K -100% $0.00 0 Aug 15, 2025 Common Stock 14.1K Direct F2
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -11K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 11K $12.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +11K $0.00 11K Aug 15, 2025 Common Stock 11K $12.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -18K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 18K $12.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +18K $0.00 18K Aug 15, 2025 Common Stock 18K $12.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -18K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 18K $12.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +18K $0.00 18K Aug 15, 2025 Common Stock 18K $12.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -18K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 18K $12.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +18K $0.00 18K Aug 15, 2025 Common Stock 18K $12.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -22.5K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 22.5K $14.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +22.5K $0.00 22.5K Aug 15, 2025 Common Stock 22.5K $14.00 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -13.9K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 13.9K $16.14 Direct F3, F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +13.9K $0.00 13.9K Aug 15, 2025 Common Stock 13.9K $16.14 Direct F3, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Includes 10,000 shares of Series B Preferred Stock which are held jointly with his spouse with right of survival, and that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering and which have no expiration date.
F2 Includes 14,083 shares of Nonvoting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering and which have no expiration date. Of his 14,083 shares of Nonvoting Common Stock, (i) 10,000 are held in his individual name and (ii) 4,083 are held jointly with his spouse with right of survival.
F3 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.
F4 The options are fully vested.