The SEC filings of Miami International Holdings, Inc. (NYSE: MIAX) provide detailed information about its capital markets activity, segment reporting and regulatory disclosures as an exchange operator. Through documents such as Form S-1 and Form 8-K, the company describes its business structure, operating segments and equity transactions.
In its Form S-1 registration statement, Miami International Holdings identifies operating segments associated with options, equities, futures and international markets, along with a corporate/non-segment category. The filing references revenue categories including transaction and clearing fees, access fees, market data fees and other products and services, giving investors insight into how the company characterizes its exchange-related activities.
Recent Form 8-K filings highlight specific events. An 8-K dated December 15, 2025 discloses unregistered sales of equity securities, including common stock issued upon conversion of a convertible promissory note and upon warrant exercises, and notes that aggregate unregistered issuances exceeded a threshold relative to shares outstanding as of a prior date. The same filing also describes the completion of a public secondary offering in which existing stockholders sold shares of common stock, with the company stating that it did not sell shares or receive proceeds.
Other 8-K reports address topics such as quarterly financial results, changes in the board of directors and the announcement of an agreement to sell a majority stake in MIAX Derivatives Exchange (MIAXdx) to Robinhood Markets, Inc. in partnership with Susquehanna International Group. These filings illustrate how the company uses current reports to communicate material events, corporate governance changes and strategic transactions.
On Stock Titan’s MIAX filings page, users can review these SEC documents as they are made available through EDGAR. AI-powered tools can help summarize lengthy forms such as S-1 and 8-K, highlight key segment and revenue disclosures, and surface notable equity issuance and offering details, making it easier to understand the regulatory information Miami International Holdings provides.
MIAX insider-affiliated accounts filed a notice to sell common stock. The filing covers 63,902 common shares to be sold on the NYSE on or after August 4, 2026, with shares to be issued upon the cash exercise of stock options.
Recent Rule 10b5-1 plan sales for Harish Jayabalan included 20,000 shares on July 6, 2026 for an aggregate sale price of $842,308.38, 9,783 shares on June 9, 2026 for $391,752.41, and 10,217 shares on June 8, 2026 for $409,930.56.
MIAX received a notice that Barbara J. Comly intends to sell 180,557 common shares on or after August 4, 2026 through the exercise of stock options for cash. The filing also lists prior Rule 10b5-1 sales of 28,000 shares each on June 2, July 2, and July 13, 2026.
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.