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.
Morgan Stanley Smith Barney LLC submitted a Form 144 reporting a sale of 25,932 shares of Common Stock by Shelly Brown pursuant to a 10b5-1 plan on 03/23/2026, generating $1,019,979.58 in proceeds. The filing lists 91,651,482 shares outstanding as of 04/06/2026.
MIAMI INTERNATIONAL HOLDINGS, INC. director Judson Gray Teekell reported an open-market sale of 2,700 shares of Common Stock at $40.00 per share. After this transaction, he directly owns 59,338 shares. The trade was executed under a pre-established Rule 10b5-1 Plan adopted on December 17, 2025, indicating the sale was pre-planned rather than opportunistic.
MIAMI INTERNATIONAL HOLDINGS, INC. executive John Smollen reported a routine tax-related share disposition. On this Form 4, he surrendered 362 shares of common stock at $37.50 per share to the company to cover tax withholding tied to restricted stock awards. A footnote clarifies this was not an open-market sale by the reporting person. After this transaction, Smollen directly holds 170,757 shares of MIAX common stock.
MIAMI INTERNATIONAL HOLDINGS EVP and Chief Strategy Officer Shelly Brown exercised stock options to acquire additional common shares. On March 30, 2026, she exercised multiple fully vested Incentive Stock Options, converting rights to buy 30,016 shares of Common Stock at strike prices ranging from $12.00 to $25.78 per share.
A total of 1,809 Common Stock shares were surrendered at $37.50 per share to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards, which the filing states does not represent a sale. Following these transactions, Brown directly owned 327,404 shares of Common Stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Barbara J. Comly reported a routine share disposition related to equity compensation. On this Form 4, 1,448 shares of common stock were surrendered to the company at $37.50 per share to cover tax withholding on vested restricted stock awards, which the footnote states does not represent a sale. After this tax-withholding transaction, she directly holds 843,844 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel, EVP, CRO and CCO of MIAX Exchanges, reported a routine tax-related share disposition. On March 30, 2026, 707 shares of common stock at $37.50 per share were surrendered to the company solely to cover tax withholding on vested restricted stock awards.
The footnote explains this transaction does not represent an open-market sale by Deitzel. After this tax-withholding event, he directly holds 116,221 shares of MIAX common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. Chairman & CEO Thomas P. Gallagher reported an indirect tax-withholding disposition of 20,875 shares of Common Stock on March 30, 2026. The shares, held by Gallagher Investments, LLC, were surrendered to the company at $37.50 per share to cover tax obligations from restricted stock awards and did not involve an open-market sale. Following this transaction, indirect holdings reported through Gallagher Investments, LLC totaled 1,827,399 shares of Common Stock, over which Mr. Gallagher maintains beneficial ownership with voting and dispositive control.
MIAMI INTERNATIONAL HOLDINGS, INC. executive vice president and CFO Lance Emmons surrendered 8,350 shares of common stock at $37.50 per share on March 30, 2026 to cover tax obligations on restricted stock awards. This tax-withholding disposition was not an open-market sale, and Emmons now directly holds 119,262 shares.
MIAMI INTERNATIONAL HOLDINGS, INC. director Jill E. Sommers filed an initial ownership report showing vested stock option holdings in MIAX common stock. The filing lists three nonqualified stock option awards, each giving the right to buy shares at fixed exercise prices before specified expiration dates.
One option covers 2,709 underlying common shares at an exercise price of $20.60 per share, expiring on December 28, 2033. A second option covers 8,792 underlying shares at $20.00 per share, expiring on March 31, 2034. A third option covers 8,306 underlying shares at $22.34 per share, expiring on March 4, 2035. A footnote states that all of these options are fully vested.
Miami International Holdings, Inc. reported board changes tied to its 2026 Annual Meeting. On March 24, 2026, director Lee Becker informed the board that he will not stand for reelection, and will continue serving until his current term ends at the Annual Meeting.
Also on March 24, 2026, upon recommendation of its Nominating and Corporate Governance Committee, the board elected Jill E. Sommers as a director effective March 25, 2026, to serve until the 2026 Annual Meeting or until a successor is elected and qualified. She has no disclosed related-party transactions or family relationships with directors or executives and will be compensated like other non-employee directors.