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

25932 1013941.20 91651482 03/23/2026 NYSE Common 02/15/2026 Restricted Stock Awards Issuer N 25932 02/15/2026 N/A Y The securities to be sold were acquired upon the vesting of restricted stock awards during the period of 02/15/2026 through 02/16/2026. 03/23/2026 12/22/2025 /s/ Shelly Brown