Cynthia Schwarzkopf - Aug 13, 2025 Form 3 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
Director
Signature
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact
Stock symbol
MIAX
Transactions as of
Aug 13, 2025
Transactions value $
$0
Form type
3
Date filed
8/13/2025, 05:09 PM
Next filing
Aug 19, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Schwarzkopf Cynthia Director C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 2025-08-13 0002080596

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 Aug 13, 2025 Common Stock 36.3K Direct F1
holding MIAX Nonvoting Common Stock Aug 13, 2025 Common Stock 45.1K Direct F2
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Nonvoting Common Stock 19.5K $12.00 Direct F3
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Nonvoting Common Stock 21.9K $12.00 Direct F3
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Nonvoting Common Stock 21.3K $12.00 Direct F3
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Nonvoting Common Stock 22.7K $12.00 Direct F3
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Nonvoting Common Stock 28.4K $14.00 Direct F3
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Nonvoting Common Stock 32.5K $16.14 Direct F3
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Common Stock 11.3K $25.98 Direct F4
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Common Stock 7.07K $19.84 Direct F4
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Common Stock 449 $20.60 Direct F4
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Common Stock 5.29K $21.32 Direct F4
holding MIAX Stock Option (Right to Buy) Aug 13, 2025 Common Stock 8.31K $22.34 Direct F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The shares of Series B Preferred Stock are convertible on a one-for-one basis into shares of common stock commencing on the Company's initial public offering of its common stock ("IPO") effective date, which is August 13, 2025. The Series B Preferred Stock has no expiration date.
F2 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.
F3 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.
F4 The options are fully vested.
F5 4,153 of the shares subject to this option are vested, 2,076 of the shares subject to this option will vest on September 30, 2025 and the remaining 2,076 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