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) initial public offering of 15M shares priced at $23.00 per share, or $2.00 above the high end of its expected range of $19.00-$21.00 per share, late Wednesday.

Miami International Holdings, trading under the ticker MIAX, had previously said it was looking for an initial offering price of between $19 and $21.