MIAX EVP Barbara Comly Exercises Options, Sells 44,445 Shares

What Happened

• Barbara J. Comly, EVP, General Counsel & Corporate Secretary of Miami International Holdings (MIAX), exercised 44,445 stock options and sold the resulting 44,445 shares on August 4, 2026. The options were exercised at $12.00 per share (exercise cost $533,340) and the shares were sold in the open market at a weighted-average price of $45.69 for total gross proceeds of $2,030,692. The filing also reports a derivative disposition of 44,445 shares at $0 in connection with the option exercise (reported separately).

Key Details

• Transaction date: 2026-08-04.
• Exercise: 44,445 options exercised at $12.00 (total cost $533,340).
• Sale: 44,445 shares sold at weighted-average $45.69 (total proceeds $2,030,692); trade prices ranged $45.09–$46.78 (file notes multiple trades).
• Options: Fully vested (footnote F3).
• Plan: Transactions were executed under a previously established Rule 10b5-1 trading plan adopted Dec 18, 2025 (footnote F1).
• Shares owned after transaction: Not disclosed in this filing.
• Filing timeliness: Report covers 2026-08-04 and was filed 2026-08-06 (no late-filing indication).

Context

• This is effectively a cashless exercise: options were exercised and the resulting shares were sold the same day. The separate $0 derivative disposition line reflects reporting of the option/settlement mechanics and is not an additional market sale. Trades executed under a 10b5-1 plan are pre-arranged and often viewed as routine dispositions rather than ad hoc market-timing.