X0609 4 2026-08-04 0 0001438472 MIAMI INTERNATIONAL HOLDINGS, INC. MIAX 0002080538 Jayabalan Harish false C/O MIAMI INTERNATIONAL HOLDINGS, INC. 7 ROSZEL ROAD, SUITE 1A PRINCETON NJ 08540 0 1 0 0 EVP, CISO and CRO 1 Common Stock 2026-08-04 4 M 0 14168 12 A 92233 D Common Stock 2026-08-04 4 M 0 5832 15.22 A 98065 D Common Stock 2026-08-04 4 S 0 20000 45.90 D 78065 D Nonqualified Stock Option (Right to Buy) 12 2026-08-04 4 M 0 14168 0 D 2029-07-31 Common Stock 14168 0 D Nonqualified Stock Option (Right to Buy) 15.22 2026-08-04 4 M 0 5832 0 D 2030-11-30 Common Stock 5832 17598 D This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 9, 2026. This transaction was executed in multiple trades throughout the day at prices ranging from $45.04 to $46.78. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected. The options are fully vested. /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 2026-08-06