Miami International Holdings, also known as financial markets exchange MIAX, raised over $345 million in its IPO Wall Street debut.

Shares, which priced at $23, rose over 33% on the first day of trading and are listed on the New York Stock Exchange under the ticker MIAX. Ticker Security Last Change Change % MIAX MIAMI INTERNATIONAL HOLDINGS INC COM USD0.001 31.15 0.00 0.00%

CEO Thomas Gallagher led his team in ringing the opening bell on the NYSE floor Thursday.

"We are a technology-driven leader in building and operating regulated financial marketplaces across multiple asset classes and geographies. Our MIAX Exchange marketplaces are enabled by our in-house-built, proprietary technology," according to a filing with the Securities and Exchange Commission.

"We believe the speed and

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