Thomas P. Gallagher - 14 Aug 2025 SCHEDULE 13D 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: 82,871,706 shares
Disclosed Ownership: 4,226,457 shares
Ownership: 5.1%
Form type: SCHEDULE 13D
Filing time: 21 Aug 2025, 16:24:37 UTC
Date of event: 14 Aug 2025
Next filing: 28 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	5.1%	4,226,457	649,101	3,577,356	Thomas P. Gallagher	/s/ Thomas P. Gallagher, Individually	0002080477
Gallagher Investments LLC	4.3%	3,577,356	0	3,577,356	Gallagher Investments LLC	/s/ Thomas P. Gallagher, Manager