MIAMI INTL HLDGS INC

Historical 13F Holders

Symbol: MIAX
CUSIP: 59356Q108
All holders as of: Q2 2026
Type: Equity
Class: COM

Reported Value, Excluding Options

Total Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Every filing for 59356Q108 since 12/18/2024, newest first.

Filer	% of Class	Shares	Form	Filed
T. Rowe Price Investment Management, Inc. 13G	5.3%	5,032,970	13G	8/14/2026 Event 6/30/2026
BlackRock, Inc. 13G	5.1%	4,949,990	13G	7/29/2026 Event 6/30/2026
Horizon Kinetics Asset Management LLC 13D/A Amendment 4	7.8%	7,400,316	13D/A Amendment 4	5/21/2026 Event 5/19/2026
Horizon Kinetics Asset Management LLC	7.8%	7,400,316
Horizon Kinetics Holding Corp	7.8%	7,400,316
Horizon Kinetics Asset Management LLC 13D/A Amendment 3	12.2%	11,162,809	13D/A Amendment 3	4/28/2026 Event 4/24/2026
Horizon Kinetics Asset Management LLC	12.2%	11,162,809
Horizon Kinetics Holding Corp	12.2%	11,162,809
Horizon Kinetics Asset Management LLC 13D/A Amendment 2	12.1%	11,061,399	13D/A Amendment 2	4/14/2026 Event 4/7/2026
Horizon Kinetics Asset Management LLC 13D/A Amendment 1	11.7%	9,499,995	13D/A Amendment 1	11/26/2025 Event 11/24/2025
Thomas P. Gallagher 13D/A Amendment 1	4.9%	4,036,237	13D/A Amendment 1	8/28/2025 Event 8/26/2025
Thomas P. Gallagher	4.9%	4,036,237
Gallagher Investments LLC	4.1%	3,385,136
Thomas P. Gallagher 13D	5.1%	4,226,457	13D	8/21/2025 Event 8/14/2025
Thomas P. Gallagher	5.1%	4,226,457
Gallagher Investments LLC	4.3%	3,577,356
Horizon Kinetics Asset Management LLC 13D	10.7%	8,679,747	13D	8/21/2025 Event 8/14/2025

13F Holders by Quarter

Period	Filings	Shares, Excl. Options	Value, Excl. Options	Options Value
2026 Q3	6	71.5 k	$2.40 M	$0
2026 Q2	223	73.2 M	$2.71 B	$32.6 M
2026 Q1	211	50.2 M	$1.95 B	$20.7 M
2025 Q4	170	38.0 M	$1.68 B	$9.26 M
2025 Q3	126	26.3 M	$1.06 B	$15.6 M