Thomas P. Gallagher - Aug 26, 2025 SCHEDULE 13D/A Report for Miami International Holdings, Inc. (the "Issuer") Common Stock, $0.001 par value per share (the "Common Stock") (MIAX)

Filing Manager: Gallagher Thomas P.
Reporting Manager: Thomas P. Gallagher
Security: Miami International Holdings, Inc. (the "Issuer") Common Stock, $0.001 par value per share (the "Common Stock")
Symbol: MIAX
Shares outstanding: 82.4M shares
Disclosed Ownership: 4.04M shares
Ownership: 4.9%
Form type: SCHEDULE 13D/A
Date filed: 8/28/2025, 04:30 PM
Date of event: Aug 26, 2025
Previous filing: Aug 21, 2025
SEC: View on sec.gov

Reporting Managers (2)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Thomas P. Gallagher	4.9%	4.04M	651K	3.39M	Thomas P. Gallagher	/s/ Thomas P. Gallagher, Individually	0002080477
Gallagher Investments LLC	4.1%	3.39M	0	3.39M	Gallagher Investments LLC	/s/ Thomas P. Gallagher, Manager