The exchange operator had previously said it was looking for an initial offering price of between $19 and $21.

Miami International Holdings, the parent of exchange operator MIAX, will begin trading on the NYSE later on Thursday, becoming the first U.S. financial exchange to go public in 15 years. The Princeton,

Miami International Holdings (MIAX) shares opened trading at $31.00 per share, jumping from its IPO price of $23, in its public markets debut on Thursday.