144 0002080878 XXXXXXXX LIVE 0001438472 Miami International Holdings, Inc. 001-42805 7 Roszel Road, Suite 1A Princeton NJ 08540 6098977300 BARBARA J. COMLY Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

180557 8455484.31 94907086 08/04/2026 NYSE Common 08/04/2026 Exercise of Stock Options Issuer N 180557 08/04/2026 Cash N 10b5-1 Sales for BARBARA J COMLY

7 Roszel Road, Suite 1A Princeton NJ 08540

Common 07/13/2026 28000 1175420.40 10b5-1 Sales for BARBARA J COMLY

7 Roszel Road, Suite 1A Princeton NJ 08540

Common 07/02/2026 28000 1154227.20 10b5-1 Sales for BARBARA J COMLY

7 Roszel Road, Suite 1A Princeton NJ 08540

Common 06/02/2026 28000 1199685.20 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. 08/04/2026 12/18/2025 /s/ Barbara J. Comly