Princeton, NJ – October 1, 2015 – MIAX Options Exchange (MIAX®) today announced that it ranked #1 in time at the National Best Bid/Offer (NBBO) among all U.S. Equity Options Exchanges for the month of August and over 20 million contracts were executed on MIAX in September. The over 20 million contracts executed represents a 48% increase from the approximately 13.6 million contracts executed in September 2014, and equates to an average daily volume of over 950,000 contracts. MIAX’s September equity options market share of 6.45% represents a 58% increase from the 4.08% achieved in September 2014.

MIAX has also established itself as an industry leader in providing best execution and liquidity to the markets by being the #1 ranked U.S. Equity Options Exchange in Percentage of Time at the NBBO in aggregate across all classes for August 2015, according to statistics provided by the TABB Group1 . Shelly Brown, Senior Vice President of Business Strategy at MIAX, said, “This is further evidence that option liquidity providers value the exceptional speed and risk protections available at MIAX. All market participants benefit from the resulting liquidity, which enhances the best execution opportunities at MIAX.” Thomas P. Gallagher, Chairman and Chief Executive Officer of MIAX, added, “The success we have experienced at MIAX is a result of the support of our members. By providing those members the technology to succeed, they have chosen to provide deep and liquid markets on MIAX.”

For further information regarding the MIAX Exchange Group, please visit www.MIAXOptions.com or contact MIAX Trading Operations at TradingOperations@MIAXOptions.com.

Corporate Communications Contact:

Dominique Prunetti-Miller

(609) 897-1465

dprunetti@miami-holdings.com

About MIAX Options and MIH

MIAX Options, which commenced operations on December 7, 2012, is a fully electronic options trading exchange approved by the SEC as a national securities exchange on December 3, 2012. MIAX Options has assembled a team with deep rooted experience in developing, operating and trading on options exchanges. Its trading platform has been developed in-house and designed from the ground up for the unique functional and performance demands of derivatives trading. MIAX Options now lists and trades options on over 2,300 multi-listed classes. MIAX Option’s unparalleled system throughput is approximately 27 million quotes per second. The average latency for a single quote on MIAX Options is approximately 28.89 microseconds for a full round trip. At the 99th percentile, the latency on MIAX Options is approximately 43.90 microseconds. At the 99.9th percentile, the latency on MIAX Options is approximately 79.01 microseconds. The executive offices and technology development center as well as the National Operations Center for the MIAX Options are located in Princeton, New Jersey.

MIAX Options, Miami International Technologies, LLC (MIAX Technologies) and MIAX Global, LLC (MIAX Global) are wholly-owned subsidiaries of Miami International Holdings, Inc. (MIH). MIAX Technologies is MIH’s technology subsidiary for the sale and/or license of MIAX trading technology. MIAX Global focuses on merger, acquisition and joint venture activities of MIH. MIAX Global also provides technology and other services outside of North America, with its initial concentration being on Europe and Latin America.

Disclaimer and Cautionary Note Regarding Forward-Looking Statements

The press release shall not constitute an offer to sell or a solicitation of an offer to purchase any securities of MIH, and shall not constitute an offer, solicitation or sale in any state or jurisdiction in which such offer; solicitation or sale would be unlawful. This press release may contain forward-looking statements, including forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements include, but are not limited to, statements concerning the plans, objectives, expectations and intentions and other statements that are not historical or current facts of MIH, together with its subsidiaries, including MIAX Options (the Company). Forward-looking statements include, but are not limited to, statements about the possible or assumed future results of operations of the Company; the competitive position of the Company; potential growth opportunities available to the Company; the expectation with respect to securities, options and future markets and general economic conditions; the effects of competition on the Company’s business; and the impact of future legislation and regulatory changes on the Company’s business. Forward-looking statements are based on the Company’s current expectations and involve risks and uncertainties that could cause actual results to differ materially from those expressed or implied in such forward-looking statements.