Options Specific Symbol Processing

Cboe has implemented a symbol mapping mechanism ( Symbol Mapping message) for the Multicast Top feeds, which maps each specific simple options contract to a six character, ASCII Symbol. This symbol mapping significantly reduces the size of the Multicast Top feed and allows participants to use the same symbol handling mechanisms for the Cboe operated equity, options, and futures exchanges. This symbol mapping is the same as the US Options Multicast PITCH feed.

Mapping occurs on a continuous basis on each unit’s multicast feed. Symbol Mapping messages will be un-sequenced and are sent from pre-market through the end of trading. The rate is variable and will be adjusted as bandwidth allows. Once the same contract has been seen twice, the user can be certain the full loop has been observed.

In addition to the symbol mapping events available on the Multicast Top feed, a downloadable file with current mappings is available via the Cboe website.