Form 4 Filing for MIAMI INTERNATIONAL HOLDINGS, INC.

This filing details a Form 4 filed by Cees Vermaas, CEO of TISEG at MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX). On June 16, 2026, Vermaas acquired 4,660 shares of Common Stock and a nonqualified stock option to purchase 4,793 shares of Common Stock. The stock option has an exercise price of $40.24 and expires on June 15, 2036. The acquired shares are subject to vesting schedules tied to continued service, with RSUs vesting in installments between June 16, 2027, and June 16, 2029, and the stock option shares vesting between June 16, 2027, and June 16, 2029. All transactions are marked as direct ownership.