John Smollen - 15 Aug 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
Issuer symbol
MIAX
Transactions as of
15 Aug 2025
Net transactions value
$0
Form type
4
Filing time
19 Aug 2025, 16:07:40 UTC
Previous filing
15 Aug 2025
Next filing
15 Sep 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 19 Aug 2025 0002080703

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Conversion of derivative security +73,173 68,173 15 Aug 2025 Direct F1
transaction MIAX Common Stock Conversion of derivative security +91,666 91,666 15 Aug 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 -91,666 -100% $0.000000 0 15 Aug 2025 Common Stock 91,666 Held by Quivetneck Capital LLC of which Mr. Smollen is a managing member F2
transaction MIAX Nonvoting Common Stock Conversion of derivative security $0 -65,947 -100% $0.000000 0 15 Aug 2025 Common Stock 65,947 Direct F1
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -24,999 -100% $0.000000 0 15 Aug 2025 Series B Preferred Stock 24,999 $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +24,999 $0.000000 24,999 15 Aug 2025 Common Stock 24,999 $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -24,999 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 24,999 $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +24,999 $0.000000 24,999 15 Aug 2025 Common Stock 24,999 $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -8,333 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 8,333 $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +8,333 $0.000000 8,333 15 Aug 2025 Common Stock 8,333 $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -6,570 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 6,570 $15.22 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +6,570 $0.000000 6,570 15 Aug 2025 Common Stock 6,570 $15.22 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -7,757 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 7,757 $25.78 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +7,757 $0.000000 7,757 15 Aug 2025 Common Stock 7,757 $25.78 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -125,001 -100% $0.000000 0 15 Aug 2025 Series B Preferred Stock 125,001 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +125,001 $0.000000 125,001 15 Aug 2025 Common Stock 125,001 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -75,001 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 75,001 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +75,001 $0.000000 75,001 15 Aug 2025 Common Stock 75,001 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -104,167 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 104,167 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +104,167 $0.000000 104,167 15 Aug 2025 Common Stock 104,167 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -80,930 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 80,930 $15.22 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +80,930 $0.000000 80,930 15 Aug 2025 Common Stock 80,930 $15.22 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -29,743 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 29,743 $25.78 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +29,743 $0.000000 29,743 15 Aug 2025 Common Stock 29,743 $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.