Insider Transaction Report for Teekell Judson Gray

This SEC filing details a transaction by Teekell Judson Gray, a director at MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX). On July 2, 2026, Mr. Gray disposed of 3,000 shares of Common Stock at a price of $40.00 per share, resulting in a post-transaction ownership of 75,251 shares. This transaction was executed under a Rule 10b5-1 trading plan established on December 17, 2025. The filing is Form 4, indicating changes in beneficial ownership.