Question 1

Does Horizon Kinetics Asset Management own MIAX stock?

Accepted Answer

Yes. As of its Q2 2026 13F, Horizon Kinetics Asset Management holds 7,842,173 shares of MIAX (Miami International Holdings), worth $291.4M.

Question 2

How many shares of MIAX does Horizon Kinetics Asset Management own?

Accepted Answer

As of its Q2 2026 13F, Horizon Kinetics Asset Management holds 7,842,173 shares of MIAX (Miami International Holdings).

Question 3

What is Horizon Kinetics Asset Management's MIAX position worth?

Accepted Answer

As of its Q2 2026 13F, Horizon Kinetics Asset Management's MIAX position is worth $291.4M.

Question 4

Is Horizon Kinetics Asset Management buying or selling MIAX?

Accepted Answer

In Q2 2026, Horizon Kinetics Asset Management increased its MIAX position by 4,390,624 shares (+127.2%).

Question 5

When did Horizon Kinetics Asset Management first buy MIAX?

Accepted Answer

Horizon Kinetics Asset Management already held MIAX in its Q3 2025 13F, the earliest on record, and has listed it in 4 quarterly 13F filings.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Increased	7.8M	+127.2%	$291.4M	3.3%	$37.16	91
2026-Q1	Increased	3.5M	+89.7%	$134.3M	1.5%	$42.04	75
2025-Q4	Increased	1.8M	+31.6%	$80.8M	1.1%	$45.68	60
2025-Q3	New	1.4M	-	$55.7M	0.7%	$40.77	57

MIAX4 quarters

MIAX
4 quarters