Cboe Options Updates SPX/SPXW Auction Response Intervals

Effective May 12, 2025, Cboe Options Exchange (C1) will update the SPX/SPXW response time interval for Complex Order Auctions (COA) and Simple and Complex Automated Improvement Mechanism Auctions (AIM/C-AIM) from 500ms to 100ms.

Additionally, C1 will update the maximum additional time spent reading auction responses arriving at the Matching Engine server NIC prior to the auction end time, increasing it from 100ms to 900ms on the SPX/SPXW matching units.

Cboe may adjust these intervals at any time with notice to customers.

This functionality is currently available to test in the C1 certification environment.

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