MIAX EVP Edward Deitzel Exercises Options, Sells 11,000 Shares

What Happened

• Edward Deitzel, EVP / CRO / CCO for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX), exercised 11,000 stock options at an exercise price of $12.00 per share (cost $132,000) on 2026-09-03 and sold 11,000 shares in the open market the same day for gross proceeds of $464,310 (weighted average sale price $42.21). An additional derivative-line in the filing shows 11,000 shares disposed at $0 (see Key Details).

Key Details

• Transaction date: 2026-09-03; filing received 2026-09-04 (timely).
• Exercise: 11,000 shares acquired at $12.00 each = $132,000.
• Sale: 11,000 shares disposed via open-market transactions; weighted average price $42.21; total proceeds $464,310 (trades ranged $42.00–$42.32).
• Additional entry: 11,000 derivative shares reported disposed at $0 (reported by the filing; options are noted as fully vested).
• Sale executed pursuant to a previously established Rule 10b5-1 plan adopted December 30, 2025.
• Shares owned after the transaction: not specified in the provided filing.
• Estimated gross gain before fees/taxes: roughly $332,310 (sale proceeds minus exercise cost).

Context

• Because the shares were exercised and sold the same day, this is effectively a cashless exercise — the insider converted options to shares and sold them immediately. The open-market sale was executed under a pre-established 10b5-1 plan, a common mechanism for scheduled insider sales that helps avoid timing issues; this is typically considered routine rather than a directional market signal.