144 0002080506 XXXXXXXX LIVE 0001438472 Miami International Holdings, Inc. 001-42805 7 Roszel Road, Suite 1A Princeton NJ 08540 6098977300 SHELLY BROWN Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

17334 721614.42 91651482 04/07/2026 NYSE Common 04/07/2026 Exercise of Stock Options Issuer N 17334 04/07/2026 Cash N 10b5-1 Sales for SHELLY BROWN

7 Roszel Road, Suite 1A Princeton NJ 08540

Common 04/06/2026 2357 97419.76 10b5-1 Sales for SHELLY BROWN

7 Roszel Road, Suite 1A Princeton NJ 08540

Common 03/23/2026 25932 1019979.58 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. 04/07/2026 12/22/2025 /s/ Shelly Brown