Form 4: MIAX Director & 10% Owner Boosts Stake

A director and 10% owner of Miami International Holdings, Inc. reported an acquisition of common stock and existing derivative holdings.

Summary

• Murray Stahl, a director of Miami International Holdings, Inc. (MIAX), and Horizon Kinetics Asset Management LLC, a 10% owner, reported changes in beneficial ownership.
• On March 5, 2026, 7,200 shares of common stock were acquired at a price of $43.08 per share.
• Following this transaction, 4,633,842 shares are beneficially owned indirectly through Horizon Kinetics Asset Management LLC.
• Murray Stahl also holds fully vested options for a total of 34,331 shares of Miami International Holdings Inc.
• Mr. Stahl disclaims beneficial ownership over the securities held by Horizon Kinetics Asset Management LLC's Managed Accounts, except to the extent of his pecuniary interest, and does not exercise investment discretion over them.

Sentiment

Score: 7

Explanation: StockSavvy.ai views this as a moderately positive signal due to the director's direct purchase of common stock, indicating confidence. However, the disclaimer regarding the larger indirect holdings through Horizon Kinetics Asset Management LLC means the direct investment discretion is limited for the majority of the reported shares.

Positives

• A director and 10% owner acquired additional common stock, indicating confidence in the company's future.
• The reporting person holds a significant number of fully vested options, aligning their interests with long-term shareholder value.

Future Outlook

No explicit future outlook or guidance is provided, as this filing primarily reports past insider transactions.

Management Comments

• Murray Stahl serves as Chairman, Chief Executive Officer, and Chief Investment Officer of Horizon Kinetics Asset Management LLC ('HKAM'), which manages funds and accounts (the 'Managed Accounts') that hold securities of the Issuer.
• Mr. Stahl does not exercise investment discretion with respect to the securities of the Issuer that are beneficially owned by the Managed Accounts.
• Mr. Stahl disclaims beneficial ownership over the securities reported, except to the extent of his pecuniary interest therein, if any.
• The Options given to Mr. Stahl are fully vested.

Industry Context

StockSavvy.ai notes that insider purchases, especially by directors and significant shareholders, can often be interpreted by the market as a positive signal, suggesting management's confidence in the company's valuation and future prospects within the financial services industry, particularly for exchange operators like MIAX.

Comparison to Industry Standards

• Form 4 filings are standard regulatory disclosures for insider transactions across all publicly traded companies in the U.S.
• The reported transaction volume and value are specific to MIAX and Murray Stahl, and direct comparisons to other companies' insider transactions would require context on their respective market capitalizations, liquidity, and specific insider roles.
• The purchase of 7,200 shares at $43.08 by a director and 10% owner is a notable transaction for MIAX.

Related Party Transactions

• Murray Stahl, a director, acquired common stock from the issuer.
• Murray Stahl is Chairman, CEO, and CIO of Horizon Kinetics Asset Management LLC, which indirectly holds a significant stake in the issuer.

Stakeholder Impact

• Shareholders: The insider purchase could be seen as a positive signal, potentially boosting investor confidence.
• Management: The transaction aligns the director's personal financial interests more closely with the company's performance.

Key Dates

Recommendation

The insider purchase by a director and 10% owner is a positive indicator of confidence. However, a Form 4 filing alone provides limited information for a strong buy or sell recommendation. It primarily reports a transaction, and a comprehensive investment decision would require a broader analysis of the company's financials, market conditions, and strategic outlook. The significant indirect holdings through Horizon Kinetics Asset Management LLC, where Mr. Stahl disclaims direct investment discretion, also means this single direct purchase, while positive, should be viewed in context.

Keywords

MIAX, Miami International Holdings, Murray Stahl, Horizon Kinetics, Insider Trading, Form 4, Stock Purchase, Director, 10% Owner, Equity Options