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: A Form 144 filing states proposed sales of Common stock totaling 35,000 shares through J.P. Morgan Securities LLC on 05/15/2026 for NYSE-listed shares. The filing lists two vested RSA entries of 18,384 shares (03/10/2023) and 16,616 shares (03/10/2024).
MIAMI INTERNATIONAL HOLDINGS, INC. Chairman & CEO Thomas P. Gallagher exercised incentive stock options to acquire 24,999 shares of Common Stock at $12.00 per share. Following the option exercise, he holds 510,962 Common Stock shares directly. The exercised options were fully vested and no share sales were reported.
Miami International Holdings, Inc. reported higher activity and a sharp profit swing for the three months ended March 31, 2026. Total revenue rose to $369.7 million from $327.1 million a year earlier, driven mainly by higher transaction and clearing fees plus stronger access and market data revenue.
Operating income increased to $46.0 million from $22.3 million as revenues outpaced growth in compensation, technology, and other expenses. The company booked a $50.5 million gain on the sale of 90% of MIAXdx and a $70.2 million income tax benefit, turning last year’s net loss into net income of $170.2 million.
Cash and cash equivalents reached $550.8 million, with total cash, segregated cash, and restricted cash of $670.7 million. Total assets were $1.44 billion and stockholders’ equity rose to $1.07 billion, while debt remained minimal at about $1.5 million in notes payable.
Miami International Holdings reported that Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, exercised nonqualified stock options for 15,771 shares at $12 and sold 15,771 common shares at a weighted average $47.92 under a Rule 10b5-1 plan, and now indirectly holds 1,723,275 common shares.
Miami International Holdings reported a sharply stronger first quarter of 2026, swinging to profitability and delivering record revenue. Net revenue rose 40% year-over-year to $128.6 million, driven mainly by options and equities, while GAAP net income reached $170.2 million versus a loss a year earlier.
Results were boosted by a $50.5 million gain on the sale of MIAXdx and a $70.2 million income tax benefit from releasing a deferred tax valuation allowance. Adjusted earnings increased 51% to $45.3 million, adjusted diluted EPS was $0.42, and adjusted EBITDA rose 66% to $66.1 million, for a 51% margin. The company reaffirmed full-year 2026 expense and capital expenditure guidance.
Miami International Holdings Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, executed an exercise-and-sell transaction in MIAX common stock. On May 4, 2026, Gallagher Investments exercised 54,229 nonqualified stock options at $12.00 per share and sold 54,229 common shares in open-market trades at an average price of $47.26 per share.
All transactions were made under a previously established Rule 10b5-1 Plan adopted on December 29, 2025. After these transactions, Gallagher Investments held 1,723,275 MIAX common shares indirectly for Mr. Gallagher and retained 225,771 nonqualified stock options that are fully vested and remain exercisable until August 2, 2026.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel, EVP and CRO/CCO of MIAX Exchanges, reported an option exercise combined with a share sale. He exercised nonqualified stock options to acquire 11,000 shares of common stock at $12.00 per share, then sold 11,000 shares in open-market transactions at a weighted average price of $47.28 per share. After these transactions, he directly holds 116,221 shares of common stock and 18,333 nonqualified stock options expiring on May 17, 2028. The sale was carried out under a previously established Rule 10b5-1 trading plan adopted on December 30, 2025, indicating the trades were pre-scheduled.
MIAMI INTERNATIONAL HOLDINGS EVP and Chief Strategy Officer Shelly Brown executed an option exercise and sale of company stock. On May 4, 2026, Brown exercised options to acquire 16,000 shares of common stock at $12.00 per share and sold 16,000 shares in an open‑market transaction at a weighted average price of $47.28 per share.
These trades were carried out under a previously established Rule 10b5-1 trading plan adopted on December 22, 2025, indicating they were pre‑scheduled. After the transactions, Brown directly held 325,047 shares of MIAX common stock.
Miami International Holdings director Judson Gray Teekell reported an open-market sale of 3,000 shares of Common Stock on May 4, 2026 at a weighted average price of $47.30 per share, with individual trades executed between $47.14 and $47.55.
After this sale, he directly holds 56,338 shares of MIAX common stock. The transaction was carried out under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025, indicating it was pre-scheduled rather than timed discretionarily.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Douglas M. Schafer Jr., EVP and CIO, reported an exercise-and-sale transaction in company stock. He exercised nonqualified stock options to acquire 48,000 shares of Common Stock at $12.00 per share, then sold 48,000 shares in open-market trades at a weighted average price of $47.25 per share. After these transactions, he directly holds 396,681 shares of Common Stock. The sale was carried out under a previously established Rule 10b5-1 Plan adopted on December 16, 2025.