Barbara J. Comly - 15 Aug 2025 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
EVP, GC & Corporate Secretary
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, 16:06:28 UTC
Previous filing
13 Aug 2025
Next filing
10 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Comly Barbara J. EVP, GC & Corporate Secretary C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 19 Aug 2025 0002080878

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Conversion of derivative security +100,500 +14% 811,960 15 Aug 2025 Direct F1
transaction MIAX Common Stock Conversion of derivative security +130,617 +19% 811,960 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 -100,500 -100% $0.000000 0 15 Aug 2025 Common Stock 100,500 Direct F1
transaction MIAX Nonvoting Common Stock Conversion of derivative security $0 -130,617 -100% $0.000000 0 15 Aug 2025 Common Stock 130,617 Direct F2
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 -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 -13,140 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 13,140 $15.22 Direct F3, F4
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 +13,140 $0.000000 13,140 15 Aug 2025 Common Stock 13,140 $15.22 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 -133,334 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 133,334 $12.00 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +133,334 $0.000000 133,334 15 Aug 2025 Common Stock 133,334 $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 -136,860 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 136,860 $15.22 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +136,860 $0.000000 136,860 15 Aug 2025 Common Stock 136,860 $15.22 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 -150,000 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 150,000 $16.14 Direct F3, F4
transaction MIAX Nonqualified Stock Option (Right to Buy) Options Exercise $0 +150,000 $0.000000 150,000 15 Aug 2025 Common Stock 150,000 $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 Represents 100,500 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 130,617 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.