Judson Gray Teekell - 13 Aug 2025 Form 3 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
13 Aug 2025
Net transactions value
$0
Form type
3
Filing time
13 Aug 2025, 17:10:00 UTC
Next filing
19 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 13 Aug 2025 0001959770

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding MIAX Common Stock 1,096 13 Aug 2025 Direct
holding MIAX Common Stock 18,414 13 Aug 2025 By estate of Byrum W. Teekell F1
holding MIAX Common Stock 57,219 13 Aug 2025 By Teekell Oil & Gas, Inc. F2
holding MIAX Common Stock 149,744 13 Aug 2025 By Teekell Investments, LP F3
holding MIAX Common Stock 18,639 13 Aug 2025 By White Knight Communications, LP 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
holding MIAX Series B Preferred Stock 13 Aug 2025 Common Stock 30,000 Direct F5
holding MIAX Nonvoting Common Stock 13 Aug 2025 Common Stock 31,242 Direct F6
holding MIAX Series B Preferred Stock 13 Aug 2025 Common Stock 30,000 By estate of Byrum W. Teekell F5, F7
holding MIAX Nonvoting Common Stock 13 Aug 2025 Common Stock 138,131 By estate of Byrum W. Teekell F6, F8
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 22,667 $12.00 Direct F9
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 13,500 $12.00 Direct F9
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 12,833 $12.00 Direct F9
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 12,500 $12.00 Direct F9
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 5,000 $12.00 Direct F9
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 28,125 $14.00 Direct F9
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 20,556 $16.14 Direct F9
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Common Stock 9,247 $25.98 Direct F10
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Common Stock 5,783 $19.84 Direct F10
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 18,414 shares of common stock held in the estate of Byrum W. Teekell for which J. Gray Teekell is executor and disclaims beneficial ownership as to 13,811 shares of common stock. The inclusion of such 13,811 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.
F2 57,219 shares of common stock held by Teekell Oil & Gas, Inc. as to which J. Gray Teekell is the president and a stockholder and disclaims beneficial ownership as to 42,914 of such shares. The inclusion of such 42,914 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.
F3 149,744 shares of common stock held by Teekell Investments, LP as to which J. Gray Teekell is a limited partner and successor trustee of the trust that serves as its general partner and he disclaims beneficial ownership as to 112,308 of such shares. The inclusion of such 112,308 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 18,639 shares of common stock, held by White Knight Communications, LP in which J. Gray Teekell is a limited partner and successor trustee of the trust that serves as its general partner and he disclaims beneficial ownership as to 16,309 of such shares. The inclusion of such 16,309 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 shares of Series B Preferred Stock are convertible on a one-for-one basis into shares of common stock commencing at the time of the Company's initial public offering ("IPO") effective date, which is August 13, 2025. The Series B Preferred Stock has no expiration date.
F6 The shares of nonvoting common stock are convertible on a one-for-one basis into shares of common stock commencing at any time. The nonvoting common stock has no expiration date.
F7 30,000 shares of Series B preferred stock, 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 Series B preferred 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.
F8 38,132 shares of nonvoting common stock 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 nonvoting 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.
F9 The options are fully vested. The options were granted initially as the right to buy nonvoting common stock. On the closing date of the IPO, these will convert to the right to buy common stock instead of nonvoting common stock.
F10 The options are fully vested.

Remarks:

See Exhibit 24.1 - Power of Attorney