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MIAX reports a proposed sale of 44,000 shares of common stock through Morgan Stanley Smith Barney LLC’s Executive Financial Services program. The shares are tied to an exercise of stock options dated 08/04/2026, with an aggregate market value of $2,060,520.00 and are listed on the NYSE.
The disclosure also lists prior Rule 10b5-1 plan sales for Edward Deitzel of 11,000 common shares on 06/02/2026 for $463,766.99 and 11,000 common shares on 07/06/2026 for $462,442.91.
BlackRock, Inc. reports beneficial ownership of common stock of Miami International Holdings Inc. BlackRock and certain of its subsidiaries and affiliates beneficially own 4,949,990 shares, representing 5.1% of the outstanding common stock. The reporting business units have sole voting power over 4,857,052 shares and sole dispositive power over all 4,949,990 shares, with no shared voting or dispositive power. The position is held on behalf of various underlying clients, and no single other person has an interest in more than five percent of Miami International Holdings Inc’s outstanding common shares.
Miami International Holdings, Inc. reports that on July 20, 2026, the U.S. District Court for the District of New Jersey entered an Order of Dismissal With Prejudice, dismissing all claims for relief and counterclaims in its long-running litigation with Nasdaq, Inc. and their subsidiaries.
The parties have resolved all claims and counterclaims that have been or could have been asserted, and the company states it remains free to operate and modify exchanges and trading platforms and to license, commercialize, improve, utilize, implement, and sell its technology without any license or consent from Nasdaq regarding rights asserted in the case. The dispute began on September 1, 2017, was stayed in 2018 pending Patent Trial and Appeal Board proceedings, and in 2019 the PTAB invalidated six patents asserted by Nasdaq. The company filed its Answer and Counterclaims on August 31, 2021, and the stay was lifted in June 2022.
MIAMI International Holdings director Cynthia Schwarzkopf reported related stock and option transactions. She exercised 5,000 stock options at $12.00 per share to acquire common stock, then sold 5,000 common shares at $42.00 in an open-market trade under a pre-established Rule 10b5-1 Plan adopted on March 12, 2026. After these transactions, she holds 88,545 common shares and 16,916 stock options expiring on 2027-05-31.
A shareholder filed a Form 144 notice to sell 15,000 shares of common stock on 07/15/2026 through Morgan Stanley Smith Barney LLC on the NYSE, with aggregate market value of 619500.00. The filing also lists prior 10b5-1 sales of 19,500 shares for 813768.15 on 06/11/2026.
Miami International Holdings, Inc. executive Barbara J. Comly, EVP, GC & Corporate Secretary, exercised nonqualified stock options for 28,000 shares of common stock at an exercise price of $12.00 per share on July 13, 2026 and sold 28,000 shares in open-market transactions at a weighted average price of $41.98 per share, within a range of $41.40 to $43.52. The sale was executed under a previously established Rule 10b5-1 Plan adopted on December 18, 2025. Following these transactions, Comly holds 882,984 shares of common stock directly, and the exercised options are fully vested and now fully exercised.
Miami International Holdings, Inc. Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, exercised nonqualified stock options to acquire 70,000 shares of common stock at an exercise price of $12.00 per share and sold 70,000 shares in open-market transactions at a weighted average price of $42.52 per share, within a range of $42.00 to $43.49. The sale was effected under a previously established Rule 10b5-1 Plan, and following these transactions, Gallagher Investments, LLC held 1,723,275 shares of common stock indirectly beneficially owned by Mr. Gallagher. The options exercised were fully vested and this option grant now has no remaining balance.
MIAMI INTERNATIONAL HOLDINGS, INC. director David A. Brown surrendered 171 shares of common stock on July 8, 2026 to cover tax withholding tied to the net settlement of restricted stock units. This was not an open-market sale. After this tax-withholding disposition, he directly holds 7,066 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, completed a paired option exercise and share sale in MIAX common stock. On July 6–7, 2026, Gallagher Investments exercised nonqualified stock options for a total of 70,000 shares at an exercise price of $12.00 per share and sold the same 70,000 shares in open-market transactions at weighted average prices of $42.09 and $42.27 per share.
All reported transactions were executed under a previously established Rule 10b5-1 Plan adopted on December 29, 2025, indicating they were pre-scheduled. Following these transactions, Gallagher Investments holds 1,723,275 shares of MIAX common stock indirectly for Gallagher, who maintains voting and dispositive control.
Miami International Holdings executive Harish Jayabalan, EVP, CISO and CRO, exercised options and sold shares of common stock. He exercised a total of 20,000 options at an exercise price of $12.00 per share and sold 20,000 shares in an open-market transaction at a weighted average price of $42.12 per share.
The transactions occurred on July 6, 2026 under a previously established Rule 10b5-1 trading plan adopted on March 9, 2026. Following these moves, Jayabalan directly holds 78,065 shares of Miami International Holdings common stock.