Barbara J. Comly, EVP, General Counsel and Corporate Secretary of Miami International Holdings, Inc., filed a Form 4 on October 26, 2026, reporting the exercise of 12,306 stock options and a same-day sale of 12,306 shares of common stock on October 22, 2026, pursuant to a Rule 10b5-1 plan.

Key Highlights

  • Option exercise: Comly exercised 12,306 fully vested nonqualified stock options at an exercise price of $12.00 per share on October 22, 2026.
  • Same-day sale: 12,306 shares of common stock were disposed of at a weighted average price of $35.04, with individual trade prices ranging from $35.00 to $35.14.
  • Post-transaction ownership: Following the transactions, Comly directly owned 839,564 shares of common stock.
  • Remaining derivative securities: 32,138 nonqualified stock options remain beneficially owned directly, with an expiration date of May 28, 2028.
  • Rule 10b5-1 plan: The transactions were effected pursuant to a plan adopted by Comly on December 18, 2025.
  • Exchange and ticker: Miami International Holdings, Inc. trades as MIAX; the filing does not specify an exchange name alongside the ticker symbol.

Comly's Option Exercise and Sale at Miami International Holdings

According to the filing, Barbara J. Comly, serving as EVP, General Counsel and Corporate Secretary of Miami International Holdings, Inc. (MIAX), reported two transactions in common stock on October 22, 2026. First, she exercised 12,306 nonqualified stock options at a conversion price of $12.00 per share, acquiring the equivalent number of common shares. The filing notes that those options were fully vested at the time of exercise.

Immediately following the exercise, the filing discloses that Comly disposed of 12,306 shares of common stock. The reported weighted average sales price was $35.04, with individual trades executed throughout the day at prices ranging from $35.00 to $35.14. The filing states that full information regarding the number of shares and prices at which the transaction was effected will be provided upon request to the SEC staff, the issuer, or a security holder. After both transactions, Comly's direct beneficial ownership of common stock stood at 839,564 shares, down from 851,870 shares following the exercise and prior to the sale.

The filing indicates that both transactions were made pursuant to a Rule 10b5-1 plan that Comly had adopted on December 18, 2025. Following the reported activity, 32,138 nonqualified stock options remain directly owned by Comly, with an exercise price of $12.00 and an expiration date of May 28, 2028. The Form 4 was signed by Alessandra Maria Corona Henriques as attorney-in-fact and filed on October 26, 2026.

What Was Disclosed

Miami International Holdings, Inc. officer Barbara J. Comly disclosed the exercise of 12,306 stock options and the sale of an equal number of shares on October 22, 2026, under a pre-established Rule 10b5-1 plan, leaving her with 839,564 shares and 32,138 remaining options.