Judson Gray Teekell - 15 Aug 2025 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
Director
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, 16:05:51 UTC
Previous filing
13 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Teekell Judson Gray Director C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 19 Aug 2025 0001959770

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Conversion of derivative security +30,000 +93% 62,338 15 Aug 2025 Direct F1, F2
transaction MIAX Common Stock Conversion of derivative security +31,242 +100% 62,338 15 Aug 2025 Direct F1, F2
transaction MIAX Common Stock Conversion of derivative security +30,000 +53% 86,545 15 Aug 2025 By estate of Byrum W. Teekell F1, F3, F4
transaction MIAX Common Stock Conversion of derivative security +38,131 +79% 86,545 15 Aug 2025 By estate of Byrum W. Teekell F1, F3, F4

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 -30,000 -100% $0.000000 0 15 Aug 2025 Common Stock 30,000 Direct F1
transaction MIAX Nonvoting Common Stock Conversion of derivative security $0 -31,242 -100% $0.000000 0 15 Aug 2025 Common Stock 31,242 Direct F2
transaction MIAX Series B Preferred Stock Conversion of derivative security $0 -30,000 -100% $0.000000 0 15 Aug 2025 Common Stock 30,000 By estate of Byrum W. Teekell F3
transaction MIAX Nonvoting Common Stock Conversion of derivative security $0 -38,131 -100% $0.000000 0 15 Aug 2025 Common Stock 38,131 By estate of Byrum W. Teekell F4
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -22,667 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 22,667 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +22,667 $0.000000 22,667 15 Aug 2025 Common Stock 22,667 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -13,500 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 13,500 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +13,500 $0.000000 13,500 15 Aug 2025 Common Stock 13,500 $12.00 Direct F5
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -12,833 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 12,833 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +12,833 $0.000000 12,833 15 Aug 2025 Nonvoting Common Stock 12,833 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -12,500 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 12,500 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +12,500 $0.000000 12,500 15 Aug 2025 Common Stock 12,500 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -5,000 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 5,000 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +5,000 $0.000000 5,000 15 Aug 2025 Common Stock 5,000 $12.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -28,125 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 28,125 $14.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +28,125 $0.000000 28,125 15 Aug 2025 Common Stock 28,125 $14.00 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 -20,556 -100% $0.000000 0 15 Aug 2025 Nonvoting Common Stock 20,556 $16.14 Direct F5, F6
transaction MIAX Stock Option (Right to Buy) Options Exercise $0 +20,556 $0.000000 20,556 15 Aug 2025 Common Stock 20,556 $16.14 Direct F5, F6
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Includes 30,000 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 and which have no expiration date.
F2 Includes 31,242 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.
F3 Includes 30,000 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 and which have no expiration date, and which are held in the estate of Byrum W. Teekell for which J. Gray Teekell is executor and disclaims beneficial ownership as to 22,500 shares of Common Stock The inclusion of such 22,500 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.
F4 Includes 38,131 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, which are held in the estate of Byrum W. Teekell for which J. Gray Teekell is executor and disclaims beneficial ownership as to 28,599 shares of Common Stock. The inclusion of such 28,599 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.
F5 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.
F6 The options are fully vested.