Update - Cboe Timestamping Service Enhancements

Effective November 9, 2026, all Cboe-affiliated U.S. Options and Equities Exchanges and Cboe Futures Exchange, LLC (CFE) will introduce Timestamping Service enhancements to expand reporting coverage for missed liquidity, missed cancels, Options auction events, and Equities order cancels.

Upon the effective date, the Timestamping Service will be enhanced as follows:

• The Missed Liquidity Report and Missed Cancels Report post-event capture window will be expanded to 1 millisecond.

• For U.S. Options only, the Missed Liquidity Report will be updated to allow TradeCondition to be populated with c = Complex Order Auction (COA) and a = Complex AIM (C-AIM). For auctions clearing across multiple price levels, the report will show only the levels that were part of the executed outcome.

• For U.S. Options only, the U.S. Options Missed Liquidity Report will add a new Price field that will be populated for Trade and Subscriber records to support auctions that execute at multiple price levels.

• For U.S. Equities only, the Missed Cancels Report will be enhanced to include non-displayed subscriber order executions as available trade records in the report.

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