BROWN DAVID A 4

What Happened
David A. Brown, a director of Miami International Holdings, Inc. (MIAX), had 171 shares surrendered to the company to satisfy tax withholding in connection with the net settlement of restricted stock units. The shares were valued at $43.72 each, for a total of $7,476. This was a tax-withholding disposition (code F), not an open-market sale by the reporting person.

Key Details

• Transaction date: 2026-07-08; filing date: 2026-07-09.
• Shares surrendered: 171 at $43.72 per share; total value $7,476.
• Transaction code: F (shares surrendered to satisfy tax withholding).
• Footnote: Shares were surrendered to satisfy tax withholding on RSU net settlement and do not represent a sale by the reporting person.
• Shares owned after the transaction: not specified in the provided filing data.
• Filing appears timely (reported the next day).

Context
This was a routine tax-withholding action tied to the net settlement of restricted stock units (RSUs). Such surrenders are administrative and do not necessarily indicate any change in insider sentiment — they are common when equity awards vest and taxes are due.