X0508 4/A 2026-03-04 2026-03-05 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 2026-03-04 4 P 0 7200 43.38 A 4626642 I Horizon Kinetics Asset Management LLC 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 Options 16.1400 2025-08-13 2031-05-31 Miami International Holdings Inc 2500 2500 D 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. This amendment corrects a previous filing that incorrectly listed the amount of securities beneficially owned. The Options given to Mr. Stahl are fully vested. /s/ Jay Kesslen, attorney-in-fact 2026-03-06