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, Inc. (MIAX) EVP and CIO Douglas M. Schafer Jr. exercised options on October 2, 2026 to acquire 40,000 common shares at a $12 per-share exercise price, then sold 40,000 shares at a weighted average of $33.34 per share. The common-share acquisition and sale were effected pursuant to a previously established Rule 10b5-1 Plan adopted December 16, 2025. Following the exercise, his reported option position covered 155,334 shares.
Miami International Holdings, Inc. officer Douglas M. Schafer Jr. reported a planned sale of 120,000 common shares, with an aggregate market value of $4,050,000.00. The shares were and will be received through stock-option exercises over the next three months; acquisition and payment dates were and will be the exercise/sale dates.
During the prior three months, Officer Schafer reported 10b5-1 sales of 48,000 common shares on September 2, 2026, for $1,943,198.94, and 48,000 shares on August 4, 2026, for $2,193,886.40.
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) EVP, CISO and CRO Harish Jayabalan exercised 8,333 fully vested Incentive Stock Options on September 25, 2026, acquiring 8,333 shares of common stock at a $12.00 exercise price. His reported direct common-stock holdings after the transaction were 86,398 shares.
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) reported that executive vice president and chief strategy officer Shelly Brown sold 21,217 shares of Common Stock on September 16, 2026 in an open-market transaction at a weighted average price of $38.61 per share, with individual trades ranging from $37.84 to $39.56.
The sale was effected pursuant to a previously established Rule 10b5-1 Plan adopted by Shelly Brown on December 22, 2025. Following this transaction, Shelly Brown directly holds 316,490 shares of MIAX Common Stock.
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) discloses that officer Shelly Brown has filed a notice under Rule 144 to sell up to 21,217 shares of common stock, originating from Restricted Stock Awards. The shares are to be sold through Morgan Stanley Smith Barney LLC, with an aggregate market value of $838,283.67 as of September 16, 2026, and are listed on the NYSE.
The notice also reports that, during the prior three months, Brown sold 16,000 shares of MIAX common stock on July 6, 2026 for total proceeds of $674,148.80, identified as 10b5-1 Sales.
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) reported that executive Shelly Brown, EVP and Chief Strategy Officer, had 16,283 shares of Common Stock surrendered on September 11, 2026 to the company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards. This tax-withholding disposition does not represent an open-market sale, and Brown continues to hold 337,707 shares directly after the transaction. No Rule 10b5-1 trading plan is reported for this filing.
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) reported that Chairman and CEO Thomas P. Gallagher exercised vested stock options for a total of 89,603 shares of common stock on September 3, 2026, at exercise prices of $12.00, $15.22, and $22.40 per share.
Through Gallagher Investments, LLC, he acquired and then sold 47,000 shares at a weighted average price of $42.43 per share under a previously established Rule 10b5-1 trading plan adopted on December 29, 2025, while retaining both direct and indirect holdings and remaining option positions.
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) reported that executive vice president, general counsel and corporate secretary Barbara J. Comly exercised options for 44,445 shares of common stock at an exercise price of $12.00 per share on September 2, 2026, and sold the same number of shares at a weighted average price of $40.49 per share, pursuant to a previously established Rule 10b5-1 trading plan.
The option exercise reduced her position in the related option grant by 44,445 options, leaving 44,444 options of that grant outstanding and fully vested, with an expiration date of May 28, 2028.
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) reported that executive vice president and chief risk and compliance officer of MIAX Exchanges, Edward Deitzel, exercised stock options for 11,000 shares of common stock at an exercise price of $12.00 per share on September 3, 2026. The 11,000 resulting common shares were then sold the same day at a weighted average price of $42.21 per share, in trades executed between $42.00 and $42.32, pursuant to a previously established Rule 10b5-1 trading plan adopted on December 30, 2025. After this option exercise, Deitzel held 66,000 stock options directly, and the options exercised in this transaction were fully vested.
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) reported that executive vice president and chief information officer Douglas M. Schafer Jr. exercised options for a total of 48,000 shares of common stock at an exercise price of $12.00 per share on September 2, 2026, and sold 48,000 shares the same day at a weighted average price of $40.48 per share. The sales were executed in multiple trades between $39.69 and $41.80 and were made pursuant to a previously established Rule 10b5-1 trading plan adopted on December 16, 2025; the options exercised were fully vested.