144 0002080477 XXXXXXXX LIVE 0001438472 Miami International Holdings, Inc. 001-42805 7 Roszel Road, Suite 1A Princeton NJ 08540 6098977300 GALLAGHER INVESTMENTS LLC Director Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

454125 19486503.75 91651482 04/15/2026 NYSE Common 04/15/2026 Exercise of Stock Options Issuer N 350001 04/15/2026 Cash Common 12/01/2023 Restricted Stock Awards Issuer N 104124 12/01/2023 N/A Y The securities to be sold were acquired upon the vesting of restricted stock awards during the period of 12/01/2023 through 03/29/2026. The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. 04/15/2026 12/29/2025 /s/ Thomas P. Gallagher