Exchange Designated Complex Instrument Definition Message

Market makers and brokerage trading platform vendors may access QSB symbol reference data by processing the Exchange Designated Complex Instrument Definition (EDCID) message on the Cboe U.S. Options Complex Multicast PITCH and TOP market data feeds.

The EDCID message is disseminated in addition to the Complex Instrument Definition Expanded message for the QSB complex instruments. In other words, the EDCID message is supplementary information that provides and mapping of the Cboe Exchange complex instruments that are QSB instruments and their group associations.

EDCID messages are available on Complex PITCH and TOP market data feeds in a background loop throughout the trading day. In addition, EDCID messages will appear in the Complex PITCH and TOP Spin Request and Instrument Definition Request output.

See the Cboe Titanium U.S. Options Complex Multicast PITCH Specification and Cboe Titanium U.S. Options Complex Multicast TOP Specification for details on the EDCID message.