X0508 4 2025-09-26 0001438472 MIAMI INTERNATIONAL HOLDINGS, INC. MIAX 0001207097 STAHL MURRAY 470 PARK AVE S 8TH FLOOR SOUTH NEW YORK NY 10016 1 0001056823 HORIZON KINETICS ASSET MANAGEMENT LLC 470 PARK AVE S 8TH FLOOR SOUTH NEW YORK NY 10016 1 0 Common Stock 2025-09-26 4 P 0 4 41.76 A 4557923 I Horizon Kinetics Asset Management LLC OPTIONS 16.1400 2025-08-13 2031-05-31 Miami International Holdings Inc 2500 2500 D OPTIONS 16.1400 2025-08-13 2031-07-31 Miami International Holdings Inc 7500 7500 D OPTIONS 25.9800 2025-08-13 2032-06-30 Miami International Holdings Inc 10000 10000 D OPTIONS 19.8400 2025-08-13 2033-03-26 Miami International Holdings Inc 14331 14331 D Warrants 20.5000 2025-08-13 2026-11-15 Miami International Holdings Inc 24878 24878 I Horizon Kinetics Asset Management LLC Warrants 20.5000 2025-08-13 2027-02-05 Miami International Holdings Inc 27561 27561 I Horizon Kinetics Asset Management LLC Warrants 15.0000 2025-08-13 2026-04-08 Miami International Holdings Inc 21290 21290 I Horizon Kinetics Asset Management LLC Warrants 20.5000 2025-08-13 2026-10-17 Miami International Holdings Inc 38927 38927 I Horizon Kinetics Asset Management LLC Murray Stahl serves as Chairman, Chief Executive Officer, and Chief Investment Officer of Horizon Kinetics Asset Management LLC ("HKAM"), which manages funds and accounts (the "Managed Accounts") that hold securities of the Issuer. Mr. Stahl does not exercise investment discretion with respect to the securities of the Issuer that are beneficially owned by the Managed Accounts. Mr. Stahl disclaims beneficial ownership over the securities reported, except to the extent of his pecuniary interest therein, if any. The filing of this Form shall not be deemed an admission that the Mr. Stahl is the beneficial owner of such securities for purposes of Section 16 or any other purpose. Includes 5,000 shares of Series B Preferred Stock that have been converted into Common Stock on a one-for-one basis upon the closing of the Company's initial public offering and which have no expiration date and 14,998 shares of Non-Voting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's IPO and which have no expiration date. The Options given to Mr. Stahl are fully vested. The Warrants are currently vested and presently exercisable until the expiration date show. /s/ Jay Kesslen, attorney-in-fact 2025-09-30