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.
Miami International Holdings, Inc. reported that its EVP and CFO completed several incentive stock option exercises in company stock. On December 16, 2025, the executive exercised options to acquire 22,221 common shares at $13.50, 6,195 shares at $16.14, and 5,040 shares at $19.84.
After these transactions, the executive directly beneficially owned 127,612 shares of common stock. The filing also shows an incentive stock option with an exercise price of $19.84 for 5,040 shares expiring on March 28, 2033, and notes that 5,040 additional shares subject to this option are scheduled to vest on March 29, 2026, if the executive continues in service with the company or its subsidiaries.
Miami International Holdings, Inc. reported that between September 30 and December 15, 2025 it issued 4,006,946 unregistered shares of common stock, more than five percent of shares outstanding as of September 30, 2025. These shares came from converting a $5,000,000 convertible promissory note and accrued interest and from warrant exercises that generated $2,419,500 in cash plus the surrender of 733,923 shares through cashless exercises.
The company also disclosed that on December 15, 2025 certain existing stockholders completed a public secondary offering of 6,750,000 shares of common stock at $41.00 per share, and underwriters fully exercised an option to buy an additional 1,012,500 shares at the same price. Miami International Holdings did not sell shares in this offering and will not receive proceeds from these secondary sales.
Miami International Holdings, Inc.
The report also lists fully vested stock options held directly by the insider for 7,500, 10,000, 14,331 and 2,500 underlying shares at exercise prices between $16.14 and $25.98, as well as several currently vested warrants held indirectly through Horizon Kinetics Asset Management LLC for 24,878, 27,561, 21,290 and 38,927 underlying shares. Murray Stahl, who leads Horizon Kinetics Asset Management LLC, disclaims beneficial ownership except for any pecuniary interest.
Miami International Holdings, Inc., a Delaware-based company headquartered in Princeton, New Jersey, has filed a Form S-1 registration statement with the U.S. Securities and Exchange Commission for a proposed public offering of its securities. The company plans to begin sales "as soon as practicable" after the registration statement becomes effective, indicating an intention to access the public capital markets through an initial public offering process. The filing identifies Miami International Holdings’ chairman and chief executive officer, Thomas P. Gallagher, as the primary contact, and lists outside counsel from Reed Smith LLP and Ropes & Gray LLP, underscoring a formal step toward becoming a publicly traded company. The prospectus is currently preliminary, meaning the securities cannot be sold until the SEC declares the registration statement effective.
Miami International Holdings, Inc. (MIAX) reported that it has entered into an agreement to sell its wholly owned subsidiary, MIAX Derivatives Exchange (MIAXdx), to Robinhood Markets, Inc. in partnership with Susquehanna International Group. The deal is described in a MIAXdx Agreement between the parties.
The transaction is expected to close in the first quarter of 2026, subject to customary closing conditions and required filings with the Commodity Futures Trading Commission. MIAX also issued a press release on November 25, 2025, providing further details on the planned sale.
Horizon Kinetics Asset Management LLC filed an amended Schedule 13D reporting beneficial ownership of 9,499,995 shares of MIAMI INTERNATIONAL HOLDINGS, INC. common stock, representing 11.7% of the outstanding class as of the event date. The position includes 9,221,128 shares held in managed accounts and warrants exercisable for 278,867 additional shares. HKAM states it acquired the stake for investment purposes using client assets and may buy more or sell shares in the ordinary course through market or private transactions. The filing notes that Murray Stahl, HKAM’s Chairman, CEO and CIO, joined the issuer’s board of directors on July 15, 2025, which may give him influence over corporate activities, while HKAM disclaims beneficial ownership beyond its pecuniary interest.
Miami International Holdings (MIAX) reported Q3 2025 results highlighted by strong revenue growth and a one‑time financing charge tied to its IPO. Total revenue reached $339.8 million for the quarter (up from $276.7 million), driven by higher transaction and clearing fees ($292.8 million), access fees, and market data. Revenues less cost of revenues were $109.5 million versus $69.6 million a year ago. Operating results were near break‑even in the quarter, but non‑operating items included a $107.7 million loss on debt extinguishment, leading to a net loss of $102.1 million.
The company closed its IPO on August 15, 2025, issuing 17,250,000 shares at $23.00 and used proceeds to fully repay borrowings under its 2029 senior secured term loan. Year‑to‑date, operating income was $49.3 million on $994.6 million of revenue. The balance sheet strengthened with cash and cash equivalents of $401.5 million, stockholders’ equity of $831.9 million, and total assets of $1.23 billion as of September 30, 2025. MIAX also launched MIAX Sapphire and completed the acquisition of TISEG on June 5, 2025, expanding its exchange footprint.
Miami International Holdings (MIAX) announced its financial results for the quarter ended September 30, 2025. The company furnished a press release as Exhibit 99.1 under Item 2.02 to provide the details. The disclosure is being furnished to the SEC and is not deemed “filed” under the Exchange Act.
Miami International Holdings, Inc. announced that director Jamil Nazarali notified the company he will resign effective
Murray Stahl and Horizon Kinetics Asset Management LLC reported coordinated Section 16 transactions in Miami International Holdings, Inc. (MIAX). On