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

Role
EVP, Strat. Planning & BD
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, 16:07:13 UTC
Previous filing
13 Aug 2025
Next filing
28 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Brown Shelly EVP, Strat. Planning & BD C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 19 Aug 2025 0002080506

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Conversion of derivative security +500 +0.15% 339,029 15 Aug 2025 Direct F1
transaction MIAX Common Stock Conversion of derivative security +200,475 +145% 339,029 15 Aug 2025 Direct 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 -500 -100% $0.000000 0 15 Aug 2025 Common Stock 500 Direct F1
transaction MIAX Nonvoting Common Stock Conversion of derivative security $0 -200,475 -100% $0.000000 0 15 Aug 2025 Common Stock 200,475 Direct F2
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -16,666 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 16,666 $12.00 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +16,666 $0.000000 16,666 15 Aug 2025 Common Stock 16,666 $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 -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 -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 -6,195 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 6,195 $16.14 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +6,195 $0.000000 6,195 15 Aug 2025 Common Stock 6,195 $16.14 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -3,878 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 3,878 $25.78 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +3,878 $0.000000 3,878 15 Aug 2025 Common Stock 3,878 $25.78 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -65,334 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 65,334 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +65,334 $0.000000 65,334 15 Aug 2025 Common Stock 65,334 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -41,667 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 41,667 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +41,667 $0.000000 41,667 15 Aug 2025 Common Stock 41,667 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -91,667 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 91,667 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +91,667 $0.000000 91,667 15 Aug 2025 Common Stock 91,667 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -141,667 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 141,667 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +141,667 $0.000000 141,667 15 Aug 2025 Common Stock 141,667 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -143,430 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 143,430 $15.22 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +143,430 $0.000000 143,430 15 Aug 2025 Common Stock 143,430 $15.22 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -18,804 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 18,804 $16.14 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +18,804 $0.000000 18,804 15 Aug 2025 Common Stock 18,804 $16.14 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -46,121 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 46,121 $25.78 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +46,121 $0.000000 46,121 15 Aug 2025 Common Stock 46,121 $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 Represents 500 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 initial public offering ("IPO") and which have no expiration date.
F2 Represents 200,475 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 IPO and which have no expiration date.
F3 The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, 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.