What smart money is saying about Miami International Holdings, Inc.
2 funds in our archive have pitched Miami International Holdings, Inc., most recently Langdon Global Smaller Companies Portfolio in June 2026.
Miami International Holdings, Inc. (MIAX) is a financial services corporation that operates diverse marketplaces through its various subsidiaries, facilitating trading across options, futures, and cash equities. Its extensive options suite encompasses MIAX Options, MIAX Pearl, MIAX Emerald, and MIAX Sapphire. For U.S. equities, it provides MIAX Pearl Equities. The company's offerings extend to U.S. futures and their corresponding options traded on MIAX Futures, a platform that also facilitates transactions in hard red spring wheat products. Furthermore, MIAX supports international listings via BSX and TISE. Beyond market operation, MIAX also delivers essential post-trade services. This includes comprehensive clearing for U.S. futures and options through MIAX Futures Clearing, alongside its ownership of Dorman Trading. Dorman Trading, a full-service futures commission merchant, provides execution and clearing services for a broad client base, including introducing brokers, retail investors, institutional firms, and professional traders. Established in 2007, Miami International Holdings, Inc. maintains its headquarters in Princeton, New Jersey.
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Position history
Between Q4 2025 and Q3 2026, 4 fund letters reported a position in Miami International Holdings, Inc., with 1 buy (opened or added).
| Quarter | Letters | Bought | Sold | Theses |
|---|---|---|---|---|
| Q3 2026 | 1 | 0 | 0 | 0 |
| Q2 2026 | 3 | 1 | 0 | 1 |
| Q4 2025 | 0 | 0 | 0 | 1 |
Bought and Sold count moves: the same sentence published by several funds of one house in a quarter counts once.
Fund activity · 4 positions · 1 move
“Board of Director Relationships and Personal Transactions: Peter Doyle is a member of the Board of Directors of Texas Pacific Land Corporation (“TPL”). Eric Sites, who is an employee of the Funds’ adviser is a member of the Board of Directors of Miami International Holdings (“MIAX”). TPL and MIAX are holdings in certain client accounts and funds (including the Funds) managed by Horizon Kinetics Asset Management LLC (“HKAM”).”
Miami International Holdings, Inc.- June 2026
“Texas Pacific Land Corporation (“TPL”) and Miami International Holdings Inc. (“MIAX”), both of which are public companies whose shares trade on the New York Stock Exchange, are significant portfolio holdings in many of the advisory accounts managed by the Adviser.”
Miami International Holdings, Inc. - New positionLangdon Global Smaller Companies PortfolioJune 2026
“We initiated a position in Miami International Holdings during the second quarter.”
Miami International Holdings, Inc. - June 2026
“Mr. Eric Sites, an employee of the Adviser, is a member of the Board of Directors of Miami International Holdings, Inc. (“MIAX”). MIAX is a large holding in many of the portfolios managed by the Adviser and is also a large holding in the accounts of employees of the Adviser.”
Miami International Holdings, Inc.
Also mentioned · 1
These funds discuss Miami International Holdings, Inc. as a competitor, benchmark or comparable, without disclosing a position in it.
- October 2026
“Texas Pacific Land Corporation (“TPL”) and Miami International Holdings Inc. (“MIAX”), both of which are public companies whose shares trade on the New York Stock Exchange, are significant portfolio holdings in many of the advisory accounts managed by the Adviser.”
Miami International Holdings, Inc.
Fund coverage · 2 theses
Miami International Holdings, Inc. is an electronic exchange operator attractive for its transaction-based model, network effects, proprietary tech, and potential for operating leverage in expanding derivatives markets.
Read the full thesis- Horizon KineticsDecember 2025
Miami International Holdings operates a modern U.S.-licensed exchange with durable industry dynamics, rapid revenue growth, and significant runway versus much larger incumbents.
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