Welcome to our dedicated page for Miami Intl Hldg SEC filings (Ticker: MIAX), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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.
Horizon Kinetics Asset Management LLC (HKAM), a more than 10% owner of MIAMI INTERNATIONAL HOLDINGS, INC., reported an internal restructuring of its indirect holdings of common stock. The filing shows a non-cash, in-kind pro rata distribution that reduced HKAM’s pecuniary interest in certain shares.
The change reflects a reduction of 2,455,744 shares that were distributed in-kind without consideration, plus 7,200 shares in an account where HKAM no longer has a pecuniary interest. Following these changes, HKAM reports indirect ownership of 2,170,898 shares in this Form 4 and separately reports beneficial ownership of 7,400,316 shares, or 7.8 percent of the issuer’s outstanding shares, in an amended Schedule 13D.
Miami International Holdings, Inc. disclosed an amended Schedule 13D/A showing that Horizon Kinetics Asset Management LLC and its parent Horizon Kinetics Holding Corp beneficially own 7,400,316 shares of common stock, representing 7.8% of the company as of May 19, 2026.
HKAM holds sole voting and dispositive power over these shares, which are owned by client funds and accounts it manages. The position is held for investment purposes, and HKAM may buy or sell shares over time in the ordinary course of business. On May 19, 2026, HKAM distributed 4,084,261 shares in-kind on a pro rata basis, without consideration, to the beneficial owners of its managed accounts in response to client requests.
MIAMI INTERNATIONAL HOLDINGS director Judson Gray Teekell exercised stock options and had shares withheld for taxes. On May 19, 2026, he exercised options to acquire 22,667 shares of common stock at an exercise price of $12.00 per share.
The company withheld 4,991 shares at a reference price of $54.51 per share to cover the option exercise price and related tax obligations, which the footnote states does not represent a market sale. Following these transactions, Teekell directly holds 79,005 common shares.
Miami International Holdings EVP and CFO Lance Emmons sold 35,000 shares of Common Stock in an open-market transaction at an average price of $56.36 per share. After the sale, he directly holds 84,262 shares. The transaction was executed under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025, indicating it was pre-planned rather than a discretionary trade.
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 Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, exercised options and sold shares in a planned transaction. On May 5, 2026, Gallagher Investments sold 15,771 shares of common stock at a weighted average price of $47.92 per share, in open-market trades executed between $47.13 and $48.35, under a previously established Rule 10b5-1 Plan.
On the same date, Gallagher Investments exercised 15,771 nonqualified stock options at an exercise price of $12.00 per share, converting them into common stock. After these transactions, indirect holdings stood at 1,739,046 common shares, with 210,000 nonqualified stock options remaining outstanding, all indirectly held through Gallagher Investments, LLC, over which Mr. Gallagher has voting and dispositive control.
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 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.