Horizon Kinetics Asset Management Llc - Nov 24, 2025 SCHEDULE 13D/A Report for MIAMI INTERNATIONAL HOLDINGS, INC. Common Stock (MIAX)

Filing Manager: Horizon Kinetics Asset Management Llc
Reporting Manager: HORIZON KINETICS ASSET MANAGEMENT LLC
Security: MIAMI INTERNATIONAL HOLDINGS, INC. Common Stock
Symbol: MIAX
Shares outstanding: 81.2M shares
Disclosed Ownership: 9.5M shares
Ownership: 11.7%
Form type: SCHEDULE 13D/A
Date filed: 11/26/2025, 01:35 PM
Date of event: Nov 24, 2025
Previous filing: Aug 21, 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
HORIZON KINETICS ASSET MANAGEMENT LLC	11.7%	9.5M	9.5M	0	/s/Jay Kesslen	Jay Kesslen, General Counsel	0001056823