Kurt M. Eckert - 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
Transactions value $
$0
Form type
3
Filing time
13 Aug 2025, 17:07:41 UTC
Next filing
19 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Eckert Kurt M. Director C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 13 Aug 2025 0002080678

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding MIAX Common Stock 121K 13 Aug 2025 Direct

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 Nonvoting Common Stock 13 Aug 2025 Common Stock 46.9K Direct F1
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 12.9K $12.00 Direct F2
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 17.2K $12.00 Direct F2
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 18K $12.00 Direct F2
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 22.8K $12.00 Direct F2
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 125 $12.00 Direct F2
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 30.2K $14.00 Direct F2
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Nonvoting Common Stock 22.2K $16.14 Direct F2
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Common Stock 17.7K $25.98 Direct F3
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Common Stock 14.7K $19.84 Direct F3
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Common Stock 539 $20.60 Direct F3
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Common Stock 2.71K $20.60 Direct F3
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Common Stock 18K $20.00 Direct F3
holding MIAX Stock Option (Right to Buy) 13 Aug 2025 Common Stock 16.6K $22.34 Direct F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The shares of nonvoting common stock are convertible on a one-for-one basis into shares of common stock at any time. Of his 46,875 shares of nonvoting common stock, (i) 15,375 are held in his individual name and (ii) 31,500 are held jointly with his spouse with right of survivorship. The nonvoting common stock has no expiration date.
F2 The options are fully vested. The options were granted initially as the right to buy nonvoting common stock. On the closing date of the initial public offering of the Company's common stock, these will convert to the right to buy common stock instead of nonvoting common stock.
F3 The options are fully vested.
F4 8,307 of the shares subject to these options are vested, 4,152 of the shares subject to these options will vest on September 30, 2025 and the remaining 4,152 will vest on December 31, 2025, subject to the reporting person's continued service to the Issuer or its subsidiaries through the applicable vesting date.

Remarks:

See Exhibit 24.1 - Power of Attorney