Brown Shelly 4/A

What Happened

• Shelly Brown, EVP & Chief Strategy Officer of Miami International Holdings, exercised 900 stock options (cost $12.00 per share, $10,800 total) and sold shares in open-market transactions. She sold 2,357 shares on 2026-04-06 at $41.33 ($97,415) and sold 900 shares on 2026-04-07 at $42.00 ($37,800). Total cash proceeds from the reported sales were about $135,215.
• The filing is an amended Form 4 that corrects the reporting of an options exercise that occurred simultaneously with the sale of 900 shares.

Key Details

• Transaction dates and prices:
  • 2026-04-06: Sold 2,357 shares @ $41.33 — $97,415 proceeds.
  • 2026-04-07: Exercised 900 options @ $12.00 — $10,800 cost (reported as acquisition).
  • 2026-04-07: Sold 900 shares @ $42.00 — $37,800 proceeds.
  • 2026-04-07: Corrective derivative entry (900 @ $0.00) reflects the exercise/sale; see footnote.
• Options status: Footnote notes the options are fully vested.
• Filing status: This is an amended Form 4 correcting the exercise/sale reporting and the amount of securities beneficially owned. Consult the amended filing for the corrected post-transaction beneficial ownership figure.
• No 10b5-1 plan or tax-withholding notation was provided in the summary data supplied.

Context

• This appears to be a common cashless exercise pattern: options were exercised and some or all of the resulting shares were sold the same day. Such transactions can be routine (liquidity or tax-related) rather than a directional bet on the stock.
• The options exercise (code M) and simultaneous sale mean the reporting shows both the acquisition via exercise and the immediate disposition of those shares. The amended filing clarifies that sequencing and the beneficial ownership count; see the official amended Form 4 for full details.