Miami International Holdings, Inc.
MIAX- Exchange
- NYSE
- Industry
- Security Brokers, Dealers & Flotation Companies
- SEC CIK
- 0001438472
In the last 90 days, Miami International Holdings, Inc. insiders filed 0 open-market purchases and 14 sales; 207 institutions reported holding it in 13F filings for Q2 2026, worth $2.68B in total; no superinvestor holds it.
Key figures
- Market capClose on Nov 13, 2026
- $3.71B
- Insider buysOpen market, last 90 days
- 0
- Insider sellsLast 90 days, $21.7M in total
- 14
- 13F holdersQ2 2026, +6 vs. previous quarter
- 207
- 13F valueReported value at the end of Q2 2026
- $2.68B
- Superinvestors holdingAt the end of Q2 2026
- 0
Price chart
Financials
See financial statementsFrom SEC filings, in USD.
- Revenue, FY2025
- $1.36B
- No comparable prior period
- Net income, FY2025
- -$70.0M
- No comparable prior period
- Free cash flow, FY2025
- $145.0M
- No comparable prior period
- Revenue, Q3 FY2026
- $376.2M
- +10.7% year over year
Revenue flow, FY2025
Green is profit; orange is costs, expenses and taxes. Percentages are shares of revenue.
Net loss for FY2025: $70.0M (5.1% of revenue).
Short interest
See short dataFrom FINRA, settlement date Oct 30, 2026.
- Short interest
- 7.10M
- Shares sold short
- Change
- −865.9K
- −10.9% vs. previous
- Days to cover
- 4.62
- At average daily volume
Superinvestors holding MIAX, Q2 2026
Go to the superinvestors tabNo superinvestor reported holding MIAX at the end of Q2 2026.
Latest insider trades
See all insider tradesOpen-market purchases and sales by Miami International Holdings, Inc. insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Nov 5, 2026 (view filing)4:10 PM ET | Nov 3-4 | 2 days | Schafer Douglas M. JREVP and CIO | SSale | −48.0K | $34.23 | −$1.64M | −11.0%387.4K after | 2 lots10b5-1 |
| Nov 4, 2026 (view filing)4:52 PM ET | Nov 2-4 | 2 days | Comly Barbara J.EVP, GC & Corporate Secretary | SSale | −79.4K | $35.08 | −$2.78M | −8.6%839.6K after | 2 lots10b5-1 |
| Oct 26, 2026 (view filing)4:06 PM ET | Oct 22 | 4 days | Comly Barbara J.EVP, GC & Corporate Secretary | SSale | −12.3K | $35.04 | −$431.2K | −1.4%839.6K after | 10b5-1 |
| Oct 26, 2026 (view filing)4:05 PM ET | Oct 22 | 4 days | Schafer Douglas M. JREVP and CIO | SSale | −8.00K | $35.06 | −$280.5K | −2.0%387.4K after | 10b5-1 |
| Oct 6, 2026 (view filing)5:28 PM ET | Oct 2 | 4 days | Schafer Douglas M. JREVP and CIO | SSale | −40.0K | $33.34 | −$1.33M | −9.4%387.4K after | 10b5-1 |
| Sep 17, 2026 (view filing)4:43 PM ET | Sep 16 | 1 day | Brown ShellyEVP, Chief Strategy Officer | SSale | −21.2K | $38.61 | −$819.2K | −6.3%316.5K after | 10b5-1 |
| Sep 4, 2026 (view filing)4:35 PM ET | Sep 3 | 1 day | Gallagher Thomas P.Chairman & CEO | SSale | −47.0K | $42.43 | −$1.99M | −3.2%1.42M after | 10b5-1 |
| Sep 4, 2026 (view filing)4:31 PM ET | Sep 2 | 2 days | Comly Barbara J.EVP, GC & Corporate Secretary | SSale | −44.4K | $40.49 | −$1.80M | −5.0%839.6K after | 10b5-1 |
| Sep 4, 2026 (view filing)4:28 PM ET | Sep 3 | 1 day | Deitzel EdwardEVP, CRO, CCO MIAX Exchanges | SSale | −11.0K | $42.21 | −$464.3K | −8.4%119.6K after | 10b5-1 |
| Sep 4, 2026 (view filing)4:25 PM ET | Sep 2 | 2 days | Schafer Douglas M. JREVP and CIO | SSale | −48.0K | $40.48 | −$1.94M | −11.0%387.4K after | 10b5-1 |
Top 10 13F holders, Q2 2026
See all 207 holdersThe largest institutional positions in Miami International Holdings, Inc. at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Horizon Kinetics Asset Management LLC | 7,842,173 | $291.4M | 3.30% | +4,390,624+127.2% | Added |
| BlackRock, Inc. | 5,071,754 | $188.5M | 0.00% | +2,839,074+127.2% | Added |
| T. Rowe Price Investment Management, Inc. | 5,032,970 | $187.0M | 0.12% | +887,352+21.4% | Added |
| Vanguard Portfolio Management LLC | 3,786,418 | $140.7M | 0.01% | +2,411,472+175.4% | Added |
| Susquehanna International Group, LLP | 3,355,043 | $124.7M | 0.11% | +58,697+1.8% | Added |
| Vanguard Capital Management LLC | 3,165,686 | $117.6M | 0.00% | +1,750,707+123.7% | Added |
| Invesco Ltd. | 2,020,650 | $75.1M | 0.01% | +435,647+27.5% | Added |
| J Digital 6 LLC | 1,807,234 | $67.2M | 39.72% | +1,807,234 | New |
| Blair William & Co | 1,769,432 | $65.8M | 0.17% | +1,103,651+165.8% | Added |
| Balyasny Asset Management LLC | 1,682,924 | $62.5M | 0.11% | +1,682,924 | New |
Holders of 5% or more of MIAX
See all 3 holders and filingsHolders whose latest Schedule 13D or 13G filing reports 5% or more of Miami International Holdings, Inc..
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Horizon Kinetics Asset Management LLC | 13D/A | 7.80%7.40M shares | −4.40 ppfrom 12.20% | Aug 21, 20255 filings | May 21, 2026 | SEC |
| BlackRock, Inc. | 13G/A | 6.20%6.12M shares | +1.10 ppfrom 5.10% | Jul 29, 20262 filings | Oct 27, 2026 | SEC |
| T. Rowe Price Investment Management, Inc. | 13G | 5.30%5.03M shares | New | Aug 14, 20261 filing | Aug 14, 2026 | SEC |
Politician trades
All politician trades in MIAX1 member of Congress reported 1 trade in Miami International Holdings, Inc. since 2020. Newest filings:
| Filed | Politician | Type | Amount |
|---|---|---|---|
| Apr 7, 2026 |  Gilbert Ray Cisneros, Jr. House · CA | Buy | $15K-$50K |
House · CA · Apr 7, 2026
Buy$15K-$50K