Miami International's (MIAX) MIAX Exchange reported average daily volume of about 10.7 million contracts in September, down from about 10.8 million a year earlier, the company said Tuesday.

The exchange's options market share fell to 16.7% in September from 17.6% a year earlier.

Year-to-date market share through September rose to 17.1% from 16.7% in the year-ago period.