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flag MIAX set records in September 2025 with a 73% surge in options volume and a 17.6% market share.

flag MIAX reported record-breaking trading activity in September 2025, with its U.S. exchange group posting a monthly average daily volume of 10.8 million options contracts—up 73.1% from last year—and a market share of 17.6%, peaking at 20.0% on September 23. flag Year-to-date average daily volume reached 9.0 million contracts, a 40.4% increase. flag MIAX Futures also hit a record year-to-date average daily volume of 14,633 contracts, up 14.1%. flag The launch of MIAX Sapphire in Miami on September 12 expanded access to 100% of the multi-listed U.S. options market.

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