Cboe Options to Add Session Indicator to Options Lite Trade Message

Effective November 6, 2026, the Cboe Options Lite feed for all Cboe-affiliated U.S. Options Exchanges will add a Session Indicator field to the Trade message and increase the Cboe Options Lite frame header version from 1 to 2.

OPRA added a Session Identifier to its Trade message on September 21, 2026. To support this, the Cboe Options Lite feed will add a Session Indicator field to the Trade message. The field is an integer, where 0 indicates the regular session and 1 indicates extended hours trading.

The Cboe Options Lite frame header version will increase from 1 to 2. Version 1 clients are binary compatible with version 2, but will not include the new field in the decode.

Customers who want to display the Session Indicator field must update to the latest trade message AVRO spec and regenerate the AVRO decoder for the Trade message type.

This functionality is currently available for testing in the Options certification environments.

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