Form 4: Insider Trades: Exec Sells MIAX Stock

Barbara J. Comly, EVP, GC & Corporate Secretary of Miami International Holdings, Inc., executed a Rule 10b5-1 plan sale of 28,000 shares.

Summary

• Barbara J. Comly, Executive Vice President, General Counsel & Corporate Secretary of Miami International Holdings, Inc. (MIAX), sold 28,000 shares of common stock on July 2, 2026.
• The sale was conducted under a pre-established Rule 10b5-1 trading plan adopted on December 18, 2025.
• The weighted average sale price was $41.22 per share, with individual transactions ranging from $39.79 to $41.79.
• Following the sale, Comly beneficially owns 882,984 shares of common stock.
• Additionally, 28,000 non-qualified stock options, fully vested and exercisable at $12 per share, were held by Comly.

Sentiment

Score: 4

Explanation: StockSavvy.ai views this as a neutral to slightly negative filing due to the sale of a significant number of shares by a key executive, even though it was conducted under a pre-arranged plan.

Positives

• The transaction was executed under a Rule 10b5-1 plan, indicating a pre-planned and potentially less market-sensitive sale.
• The sale occurred at prices within a defined range, suggesting orderly execution.
• Comly retains a significant beneficial ownership of 882,984 shares, indicating continued investment in the company.

Negatives

• A substantial number of shares (28,000) were sold by a key executive.
• The sale represents a disposition of equity, which could be interpreted negatively by the market.

Risks

• The sale of shares by a high-ranking executive could signal a lack of confidence in future stock performance, although it was executed under a 10b5-1 plan.
• The weighted average sale price of $41.22 is noted, but the filing does not provide context on whether this is a favorable price relative to the company's valuation or recent performance.

Future Outlook

The filing does not contain forward-looking statements or guidance. It solely reports on past transactions.

Industry Context

StockSavvy.ai notes that Form 4 filings are standard disclosures for insider transactions. The execution of a Rule 10b5-1 plan is a common strategy for executives to diversify holdings or manage personal finances without appearing to trade on material non-public information. The volume of shares sold by Ms. Comly, while significant in absolute terms, needs to be assessed against her total holdings and the company's overall trading volume.

Stakeholder Impact

• Shareholders may view the sale by a senior executive with some concern, potentially impacting short-term stock sentiment, despite the Rule 10b5-1 plan.

Key Dates

Recommendation

The filing reports an insider sale under a Rule 10b5-1 plan. While insider selling can be a negative signal, the pre-planned nature of the transaction mitigates concerns about trading on non-public information. The executive retains a substantial number of shares. Without further financial or strategic information from the company, a 'hold' recommendation is appropriate, pending a broader analysis of MIAX's fundamentals and market position.

Keywords

Form 4, Insider Trading, Miami International Holdings, MIAX, Stock Sale, Rule 10b5-1 Plan, Beneficial Ownership, Executive Sale, Common Stock, Stock Options