Thomas P. Gallagher - 26 Aug 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: Thomas P. Gallagher
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: 82,372,184 shares
Disclosed Ownership: 4,036,237 shares
Ownership: 4.9%
Form type: SCHEDULE 13D/A
Filing time: 28 Aug 2025, 16:30:05 UTC
Date of event: 26 Aug 2025
Previous filing: 21 Aug 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%	4,036,237	651,101	3,385,136	Thomas P. Gallagher	/s/ Thomas P. Gallagher, Individually	0002080477
Gallagher Investments LLC	4.1%	3,385,136	0	3,385,136	Gallagher Investments LLC	/s/ Thomas P. Gallagher, Manager