X0609 4 2026-06-15 0 0001438472 MIAMI INTERNATIONAL HOLDINGS, INC. MIAX 0001394399 BROWN DAVID A false C/O MIAMI INTERNATIONAL HOLDINGS, INC. 7 ROSZEL ROAD, SUITE 1A PRINCETON NJ 08540 1 0 0 0 0 Common Stock 2026-06-15 4 A 0 2267 0 A 2267 D Common Stock 2026-06-16 4 A 0 4970 0 A 7237 D Nonqualified Stock Option (Right to Buy) 40.24 2026-06-16 4 A 0 5142 0 A 2036-06-15 Common Stock 5142 5142 D The amount represents restricted stock units ("RSUs") that fully vested on the date of grant. Each RSU represents a right to receive one share of the Issuer's common stock. The amount represents RSUs that vest on the last business day immediately preceding the 2027 annual meeting of stockholders, subject to the reporting person's continued service to the Issuer through the vesting date. 2,571 of the shares subject to this option will vest on June 30, 2026, 1,285 of the shares subject to this option will vest on September 30, 2026 and the remaining 1,286 of the shares subject to this option will vest on December 31, 2026, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date. /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 2026-06-17