Miami International Holdings
MIAX · NYSE
$32.41+$0.87 (+2.76%)TodayMarket closed ·
Prev close $31.54
Who owns MIAX
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 38.7% of MIAX’s shares.
- Horizon Kinetics LLC8.1%
- T. Rowe Price Investment Management, Inc.5.2%
- BlackRock Institutional Trust Company, N.A.4.7%
- Vanguard Portfolio Management, LLC3.9%
- Next 6 largest institutions16.8%
- All other shareholders61.3%
| Holder | Shares | % of shares |
|---|---|---|
| Horizon Kinetics LLC | 7.84M | 8.10% |
| T. Rowe Price Investment Management, Inc. | 5.03M | 5.20% |
| BlackRock Institutional Trust Company, N.A. | 4.55M | 4.70% |
| Vanguard Portfolio Management, LLC | 3.79M | 3.91% |
| Al-Bahar (Talal Jassim) | 3.66M | 3.78% |
| Susquehanna International Group, LLP | 3.36M | 3.47% |
| Vanguard Capital Management, LLC | 3.17M | 3.27% |
| Gallagher (Thomas P.) | 2.47M | 2.55% |
| Invesco Advisers, Inc. | 1.84M | 1.90% |
| J Digital 6 Cayman Ltd | 1.81M | 1.87% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 2.72M | 2.81% |
| iShares Russell 2000 ETF | 1.99M | 2.05% |
| Vanguard Small-Cap Index Fund | 1.96M | 2.03% |
| T. Rowe Price Small Cap Stock Fund | 1.46M | 1.51% |
| Vanguard Small-Cap Value Index Fund | 1.25M | 1.29% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $57.47M (50 trades) of MIAX on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Schafer Douglas M. JR | Option exercise | 40.00K | — |
| Schafer Douglas M. JR | Sale | 40.00K | $1.33M |
| Schafer Douglas M. JR | Option exercise | 40.00K | $480.00K |
| Jayabalan Harish | Option exercise | 8.33K | — |
| Jayabalan Harish | Option exercise | 8.33K | $100.00K |
| Brown Shelly | Sale | 21.22K | $819.19K |
| Brown Shelly | Tax withholding | 16.28K | $692.68K |
| Deitzel Edward | Option exercise | 11.00K | — |
| Deitzel Edward | Sale | 11.00K | $464.31K |
| Deitzel Edward | Option exercise | 11.00K | $132.00K |
Short interest
Settled Sep 30, 2026
- Shares short
- 8.88M
- Days to cover
- 4.64
- % of shares outstanding
- 9.18%
- Average daily volume
- 1.91M
- Change since last report
- +29.8%
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