PRINCETON, N.J. and MIAMI , Dec. 9, 2025 /PRNewswire/ -- Miami International Holdings, Inc. ("MIAX" or the "Company") (NYSE: MIAX), a technology-driven leader in building and operating regulated financial markets across multiple asset classes, today announced the launch of a proposed secondary public offering (the "Offering") of 6,750,000 shares of its common stock including certain shares to be issued upon the exercise of warrants. The proposed Offering consists entirely of secondary shares to be sold by certain selling stockholders of the Company (the "Selling Stockholders").

The underwriters will have a 30-day option to purchase up to an additional 1,012,500 shares of common stock from the Selling Stockholders. The Company is not selling any shares of common stock in the proposed Of

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