Transaction details
Thomas P. Gallagher, who serves as Chairman and Chief Executive Officer of Miami International Holdings, Inc. (MIAX), completed a series of sales of the company's common stock on April 15, 2026. In total, Gallagher disposed of 224,025 shares at a weighted average sale price between $43.36 and $43.68, producing proceeds of approximately $9.7 million.
The filings with the Securities and Exchange Commission show that the sales were executed across multiple trades during the trading session at prices ranging from $42.57 to $44.41.
Options exercise and acquisition vehicle
Also on April 15, Gallagher exercised stock options to acquire 70,001 shares of Miami International Holdings common stock at an exercise price of $12 per share. The acquisition of those optioned shares was made through Gallagher Investments, LLC, with the total exercise value recorded as $840,012.
Ownership following the transactions
After the day’s transactions, the filing indicates that Gallagher directly owns 485,963 shares of MIAX common stock and, when including indirect holdings, beneficially owns 1,723,275 shares.
For investors seeking further context on valuation metrics or executive trading patterns, the filing notes the availability of a Pro Research Report for this company and more than 1,400 U.S. equities on InvestingPro.
Corporate performance and operational updates
Miami International Holdings reported stronger-than-expected results for the fourth quarter of 2025. Adjusted diluted earnings per share came in at $0.52, ahead of the $0.33 expectation. Revenue for the quarter reached $125 million, a 52% increase year-over-year.
Operationally, the MIAX Exchange Group posted increased activity. Year-to-date average daily trading volume through March 2026 rose 26.6% to an average of 10.9 million contracts. February 2026 options trading volume was up 25.4% compared with the same month a year earlier. In February 2026, the MIAX Exchange Group captured 17.1% of the U.S. equity options market, an increase from the prior year.
Board changes
The company disclosed changes to its board of directors. Lee Becker has decided not to seek reelection at the 2026 Annual Meeting of Shareholders, and board member Murray Stahl passed away. The company reported that there were no disagreements regarding the company’s operations or policies.
These updates together provide a snapshot of recent insider activity, option exercises, financial performance, market share gains in options trading, and board-level developments at Miami International Holdings.