John Smollen - Aug 15, 2025 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
EVP Traded Products & Relation
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 15, 2025
Next filing
Sep 15, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Smollen John EVP Traded Products & Relation C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 2025-08-19 0002080703

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Conversion of derivative security +73.2K 68.2K Aug 15, 2025 Direct F1
transaction MIAX Common Stock Conversion of derivative security +91.7K 91.7K Aug 15, 2025 Held by Quivetneck Capital LLC of which Mr. Smollen is a managing member 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 -91.7K -100% $0.00 0 Aug 15, 2025 Common Stock 91.7K Held by Quivetneck Capital LLC of which Mr. Smollen is a managing member F2
transaction MIAX Nonvoting Common Stock Conversion of derivative security $0 -65.9K -100% $0.00 0 Aug 15, 2025 Common Stock 65.9K Direct F1
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -25K -100% $0.00 0 Aug 15, 2025 Series B Preferred Stock 25K $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +25K $0.00 25K Aug 15, 2025 Common Stock 25K $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -25K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 25K $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +25K $0.00 25K Aug 15, 2025 Common Stock 25K $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -8.33K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 8.33K $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +8.33K $0.00 8.33K Aug 15, 2025 Common Stock 8.33K $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -6.57K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 6.57K $15.22 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +6.57K $0.00 6.57K Aug 15, 2025 Common Stock 6.57K $15.22 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -7.76K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 7.76K $25.78 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +7.76K $0.00 7.76K Aug 15, 2025 Common Stock 7.76K $25.78 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -125K -100% $0.00 0 Aug 15, 2025 Series B Preferred Stock 125K $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +125K $0.00 125K Aug 15, 2025 Common Stock 125K $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -75K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 75K $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +75K $0.00 75K Aug 15, 2025 Common Stock 75K $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -104K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 104K $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +104K $0.00 104K Aug 15, 2025 Common Stock 104K $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -80.9K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 80.9K $15.22 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +80.9K $0.00 80.9K Aug 15, 2025 Common Stock 80.9K $15.22 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -29.7K -100% $0.00 0 Aug 15, 2025 Nonvoting Common Stock 29.7K $25.78 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +29.7K $0.00 29.7K Aug 15, 2025 Common Stock 29.7K $25.78 Direct F3, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Includes 65,947 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 ("IPO") and which have no expiration date.
F2 Represents 91,666 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's IPO and which have no expiration date.
F3 The options were granted initially as the right to buy Nonvoting Common Stock or Series B Preferred Stock, as applicable. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock or Series B Preferred Stock, as applicable, for the same price and under the same conditions.
F4 The options are fully vested.