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.
Miami International Holdings director Kurt M. Eckert exercised stock options for 1,063 shares of Common Stock at $12.00 per share on August 4, 2026, then sold 1,063 shares at a weighted average price of $45.80 per share. The options were fully vested and this grant was exhausted, with transactions effected under a Rule 10b5-1 Plan adopted on December 18, 2025.
Miami International Holdings, Inc. director Teekell Judson Gray reported selling 3,000 shares of Common Stock on August 4, 2026 at a weighted average price of $45.79 per share. Following this sale, he directly holds 72,251 shares. The transaction, executed in multiple trades between $45.13 and $46.56, was carried out under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025.
MIAMI International Holdings executive Jayabalan Harish, EVP, CISO and CRO, exercised nonqualified stock options for 20,000 common shares on August 4, 2026, at strike prices of $12.00 and $15.22, then sold 20,000 common shares at a weighted average price of $45.90 in open-market trades between $45.04 and $46.78, all pursuant to a previously established Rule 10b5-1 Plan adopted on March 9, 2026. The options exercised were fully vested.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Barbara J. Comly, EVP, GC & Corporate Secretary, exercised 44,445 nonqualified stock options into common stock at an exercise price of $12.00 per share on August 4, 2026, and sold the resulting 44,445 common shares at a $45.69 weighted average price, with individual trade prices ranging from $45.09 to $46.78, in a sale in open market or private transactions. Following the exercise, she reported 88,889 nonqualified stock options remaining, which are fully vested and expire on May 28, 2028. These trades were effected pursuant to a previously established Rule 10b5-1 trading plan adopted on December 18, 2025.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel, EVP, CRO, CCO of MIAX Exchanges, exercised nonqualified stock options to acquire 11,000 shares of common stock at $12.0000 per share and sold 11,000 shares at a weighted average price of $45.7800 on August 4, 2026, under a previously adopted Rule 10b5-1 Plan. He continues to hold 77,000 fully vested nonqualified stock options following this exercise.
Miami International Holdings EVP and CIO Douglas M. Schafer Jr exercised 48,000 nonqualified stock options at $12.0000 per share into 48,000 shares of common stock, then sold 48,000 shares at a weighted average price of $45.7100 per share pursuant to a previously established Rule 10b5-1 Plan adopted on December 16, 2025. The options were fully vested, and he continues to hold 43,334 stock options following this exercise.
Miami International Holdings, Inc. reported insider transactions by Chairman & CEO Thomas P. Gallagher on 2026-08-04. Through Gallagher Investments, LLC, he exercised 48,334 nonqualified stock options at $12.00 per share, acquired 48,334 common shares, and sold the same amount at a weighted average of $45.69 per share in trades ranging from $45.09 to $46.78. The options were fully vested, 235,000 derivative securities remained indirectly held after the exercise, and all trades occurred under a Rule 10b5-1 plan adopted on December 29, 2025.
Miami International Holdings, Inc. reported record second-quarter 2026 net revenue of $141.1 million, up 35% year-over-year, led by its options segment where net revenue reached $124.4 million and average daily volume was 11.0 million contracts with 16.5% market share.
GAAP net income was $44.2 million versus $23.5 million, supported by a $22.4 million discrete tax benefit related to share-based compensation, while adjusted earnings were $53.3 million. Adjusted EBITDA rose 57% to $76.8 million, lifting margin to 54%, despite operating expenses increasing to $113.3 million, including a $30 million litigation settlement and growth investments. As of June 30, 2026, the company held $660.5 million of cash and cash equivalents and $1.5 million of total debt, and now expects 2026 adjusted operating expenses of $260–270 million.
MIAX has a shareholder filing to sell 48,334 shares of common stock, with an aggregate market value of $2,263,481.22. The planned sale on August 4, 2026 is tied to an exercise of stock options for cash. Common shares are listed on the NYSE, and shares outstanding were 94,907,086 at the time of the notice; this is a baseline figure, not the amount being sold.
The filing also lists recent 10b5-1 sales by Gallagher Investments over the prior three months, including multiple transactions between May and July 2026 with share counts ranging from 15,771 to 70,000 and aggregate proceeds in the low-to-mid million-dollar range per trade.
MIAX insider J Gray Teekell filed a notice of intent to sell 6,000 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services on the NYSE, with an indicated aggregate value of $280,980.00. The shares relate to previously exercised stock options and are scheduled for potential sale on August 4, 2026.
The filing also lists sales under a Rule 10b5-1 trading plan, including 3,000 shares of common stock on July 2, 2026 for $120,000.00 and 3,000 shares on June 2, 2026 for $128,343.00.