Miami International Holdings, Inc. (MIAX)
SECURITY BROKERS, DEALERS & FLOTATION COMPANIES
Miami International Holdings, Inc. (MIAX) is listed on the New York Stock Exchange, where it has traded since August 14, 2025.
- Listed On
- the New York Stock Exchange
- Listed Since
- August 14, 2025
- Employees
- 439
- Market Cap
- $3.2B
About Miami International Holdings, Inc.
Miami International Holdings Inc is engaged in operating regulated financial marketplaces across multiple asset classes using proprietary technology platforms. The company operates exchange markets for options, equities, futures, and international listings through its MIAX Exchanges, MIAX Futures Exchange, and the Bermuda Stock Exchange. The company operates through four reportable segments: Options, which provides trading and market data services for listed equity and ETP options; Equities, which provides trading services for U.S. equities and ETPs; Futures, which provides futures trading and clearing services through MIAX Futures; and International, which provides listing services for capital market instruments through the Bermuda Stock Exchange and The International Stock Exchange.
Institutional ownership
In 13F filings for the quarter ended June 30, 2026, 198 institutions reported holding MIAX, with 71.6 million shares worth $2.7 billion in aggregate. The largest reported holder was Horizon Kinetics Asset Management, with 7.8 million shares worth $291.4 million. Of the 5 largest holders listed below, all 5 added shares during the quarter.
| Institution | Shares | Value | Quarter change |
|---|---|---|---|
| Horizon Kinetics Asset Management | 7,842,173 | $291M | Added 127.21% |
| Vanguard | 7,297,857 | $271M | Added 141.58% |
| T. Rowe Price | 5,877,434 | $218M | Added 36.53% |
| BlackRock | 5,071,754 | $188M | Added 127.16% |
| Susquehanna International Group | 3,355,043 | $125M | Added 1.78% |
Form 13F is a quarterly report that institutional investment managers with at least $100 million in qualifying securities file with the SEC. It lists long positions as of the last day of the quarter and is due within 45 days of quarter end, so these holdings describe that date rather than today.
Frequently asked questions
What is MIAX?
Miami International Holdings, Inc. (MIAX) is listed on the New York Stock Exchange, where it has traded since August 14, 2025.
Who are the largest institutional holders of MIAX?
In 13F filings for the quarter ended June 30, 2026, the largest reported holders of MIAX were Horizon Kinetics Asset Management, Vanguard and T. Rowe Price.
How many institutions own MIAX?
198 institutions reported a position in MIAX for the quarter ended June 30, 2026, worth $2.7 billion in total.
Did institutions buy or sell MIAX last quarter?
Of the 5 largest reported holders, all 5 added shares during the quarter. Every reported holder and its change is on the SentiSense ownership page for MIAX.
Every reported institutional holder, plus insider and congressional trades in MIAX, on SentiSense.