Welcome to our dedicated page for MIAMI INTERNATIONAL HOLDINGS SEC filings (Ticker: MIAX), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel reported a routine share disposition related to taxes. On this Form 4, 5,939 shares of common stock were surrendered to the company at $40.79 per share to satisfy tax withholding and remittance obligations on restricted stock awards. This transaction is explicitly described as a tax-withholding mechanism and not a sale by the reporting person. After the withholding, Deitzel directly holds 110,282 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Douglas M. Schafer Jr., EVP and CIO, reported a tax-related share disposition. He surrendered 32,565 shares of common stock at $40.79 per share to cover tax withholding and remittance obligations tied to the net settlement of restricted stock awards.
The filing states this was not an open-market sale by the reporting person. After this transaction, he directly holds 364,116 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS director Cynthia Schwarzkopf reported a same-day option exercise and share sale. On June 11, 2026 she exercised options to acquire 19,500 shares of common stock at $12.00 per share, then sold 19,500 shares in an open-market transaction at a weighted average price of $41.73 per share. The sale was executed under a previously established Rule 10b5-1 trading plan, indicating the trades were pre-scheduled. After these transactions, she directly holds 81,308 shares of common stock and no remaining options from this grant, which was fully vested.
MIAMI INTERNATIONAL HOLDINGS director Paul Stahlin exercised stock options and had shares withheld for taxes. He exercised a total of 11,000 stock options at $12.00 per share into common stock on June 9 and June 11, 2026. To cover the option exercise costs and related taxes, 1,177 shares of common stock were withheld by the company, which the filing states does not represent a market sale by Stahlin. After the tax-withholding transaction, he held 34,906 common shares directly.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Harish Jayabalan, EVP, CISO and CRO, reported paired option exercises and share sales in MIAX common stock. On June 8 and 9, he exercised a total of 20,000 nonqualified stock options at $12.00 per share and sold the same 20,000 shares in open-market transactions, creating a net-sell of option exposure but no change in his common share holdings.
The sales were executed at weighted average prices of $40.12 and $40.04 per share and were carried out under a previously established Rule 10b5-1 trading plan. Following these transactions, Jayabalan continues to hold 73,405 common shares directly and retains 834 nonqualified stock options with a $12.00 exercise price expiring on October 12, 2027.
Miami International Holdings director Judson Gray Teekell sold 3,000 shares of common stock in an open-market transaction. The sale occurred on June 2, 2026 at a weighted average price of $42.78 per share. After this trade, he directly holds 71,014 shares. The transaction was executed under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025, meaning the sale was pre-scheduled rather than opportunistic. Trades were filled in multiple lots during the day at prices ranging from $41.53 to $43.99.
MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert reported an option exercise paired with a share sale. He exercised stock options to acquire 5,250 shares of common stock at $12.00 per share, then sold 5,250 shares in an open-market transaction at a weighted average price of $42.76 per share. The sale was carried out under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025. Following these transactions, he directly holds 142,375 shares of common stock, and the exercised options are fully vested and exhausted for the exercised amount.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Barbara J. Comly, EVP, General Counsel and Corporate Secretary, reported an exercise-and-sale transaction in company common stock. On 2026-06-02, she exercised nonqualified stock options for 28,000 shares at $12.00 per share and sold 28,000 shares in an open-market transaction at a weighted-average price of $42.85 per share. Following the sale, she directly held 843,844 common shares. The stock sale was carried out under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025.