# Miami International Holdings (MIAX): who owns it

1 value investor held Miami International Holdings in their Q3 2026 13F, led by Horizon Kinetics.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Horizon Kinetics | 3.3% | $291m | Added +127% | 4 |

## Fund holders

| Fund | Manager | Weight | Value | As at |
| --- | --- | --- | --- | --- |
| Horizon Kinetics Inflation Beneficiaries ETF | Horizon Kinetics | 2.4% | $35.2m | 2026-06-30 |

Source: SEC filings, via moatshark (https://www.moatshark.com/s/miax). Values traded and returns are estimates. Not investment advice. Built 2026-10-21.