Form 4: MIAX CEO Gifts 2,000 Shares to Son Under Lock-up

Miami International Holdings, Inc. Chairman and CEO Thomas P. Gallagher reported a gift of 2,000 common stock shares to his son, subject to a prior lock-up agreement.

Summary

• Thomas P. Gallagher, Chairman and CEO of Miami International Holdings, Inc. (MIAX), reported a transaction on December 23, 2025.
• Gallagher gifted 2,000 shares of MIAX common stock to his son.
• The gifted shares are subject to a lock-up agreement that Gallagher entered into on December 11, 2025, and the transferee has agreed to be bound by its terms.
• Following this transaction, Gallagher directly beneficially owns 585,963 shares of common stock.
• This total includes 12,000 shares held jointly with his spouse with right of survival.

Sentiment

Score: 5

Explanation: The sentiment is neutral as this is a routine insider transaction (a gift) and does not reflect positively or negatively on the company's operational or financial performance.

Industry Context

This filing is a routine disclosure of an insider transaction, specifically a gift of shares, which is common among executives for estate planning or personal reasons. It does not reflect operational performance or strategic shifts for Miami International Holdings, Inc. but provides transparency into insider holdings.

Related Party Transactions

• Thomas P. Gallagher, Chairman and CEO, made a bona fide gift of 2,000 shares of common stock to his son.

Stakeholder Impact

• Shareholders: Minimal impact as this is a small, personal transaction by an insider and does not affect the company's operations or financial health. The shares remain subject to a lock-up agreement, indicating continued commitment.

Key Dates

Keywords

MIAX, Miami International Holdings, Thomas P. Gallagher, Insider Transaction, Form 4, Stock Gift, Common Stock, Lock-up Agreement