Form 4: Insider Boosts MIAX Stake via Warrant Exercise

A director and 10% owner of Miami International Holdings, Inc. increased their indirect beneficial ownership of common stock through cashless warrant exercises.

Summary

• Murray Stahl, a Director, and Horizon Kinetics Asset Management LLC (HKAM), a 10% owner, reported changes in beneficial ownership of Miami International Holdings, Inc. (MIAX) common stock.
• HKAM exercised warrants to acquire 250,156 shares of common stock at exercise prices of $15, $20, and $20.50 per share on March 2, 2026.
• These warrant exercises were conducted on a cashless basis, resulting in the Issuer withholding 121,054 shares to cover the exercise price.
• Consequently, HKAM's indirect beneficial ownership of common stock increased by a net of 129,102 shares.
• Following these transactions, HKAM indirectly beneficially owns 4,689,466 shares of common stock.
• Murray Stahl also holds 34,331 fully vested options to purchase MIAX common stock at various exercise prices ($16.14, $19.84, $25.98).
• All reported transactions occurred on March 2, 2026, and were made pursuant to a Rule 10b5-1 plan.

Sentiment

Score: 7

Explanation: StockSavvy.ai views this as a moderately positive signal, as a significant insider increased their net beneficial ownership, indicating continued confidence in the company, albeit through a pre-planned warrant exercise.

Positives

• A significant 10% owner and director, Horizon Kinetics Asset Management LLC, increased its net beneficial ownership of Miami International Holdings, Inc. common stock by 129,102 shares.
• The transactions were executed under a Rule 10b5-1 plan, indicating pre-planned activity rather than a reaction to immediate market conditions.
• The exercise of warrants at prices ranging from $15 to $20.50 suggests a belief in the stock's value above these levels.

Negatives

• The cashless exercise mechanism involved the disposition of 121,054 shares to cover the exercise price, which is a common practice but reduces the total shares received by the insider.

Future Outlook

This Form 4 filing does not provide forward-looking statements or guidance regarding the company's future performance or strategic direction, focusing solely on insider ownership changes.

Management Comments

• Horizon Kinetics Asset Management LLC (HKAM) exercised warrants to purchase 341,522 shares of common stock at the exercise prices noted. HKAM paid the exercise price on a cashless basis, resulting in the Issuer withholding 121,054 of the warrant shares to pay the exercise price and issuing to HKAM the remaining 129,102 shares.
• The Options given to Mr. Stahl are fully vested.

Industry Context

StockSavvy.ai notes that insider transactions, particularly those involving significant shareholders and directors, can signal management's confidence in the company's future prospects. The exercise of warrants, especially under a pre-arranged 10b5-1 plan, is a routine capital markets activity for insiders to manage their equity positions.

Comparison to Industry Standards

• Insider buying or increasing beneficial ownership, even through warrant exercises, is generally viewed positively as it aligns insider interests with those of public shareholders. This is a standard practice for insiders to monetize or adjust their equity positions.
• The use of a Rule 10b5-1 plan is a common corporate governance practice that allows insiders to pre-arrange trades, mitigating concerns about trading on material non-public information.
• Cashless exercise of warrants is a typical method to fund the exercise price without requiring additional capital outlay from the insider, often seen across various industries for equity compensation or warrant programs.

Stakeholder Impact

• Shareholders: The increase in insider ownership by a significant shareholder and director could be perceived as a positive signal of confidence in the company's future.

Next Steps

• Monitor future Form 4 filings for further insider trading activity by Murray Stahl and Horizon Kinetics Asset Management LLC.
• Observe Miami International Holdings, Inc.'s upcoming financial reports for operational performance that might justify the insider's increased stake.

Key Dates

Recommendation

While the increase in beneficial ownership by a significant insider is a positive indicator of confidence, this Form 4 filing primarily reports a pre-planned warrant exercise rather than open market purchases. It suggests a long-term commitment but does not provide new fundamental information to warrant a stronger recommendation. Investors should hold and monitor future company performance and additional insider activity.

Keywords

Miami International Holdings, MIAX, Form 4, Insider Trading, Beneficial Ownership, Warrant Exercise, Stock Options, Horizon Kinetics Asset Management, Murray Stahl, Rule 10b5-1