While all Cboe systems are currently operating normally, please be advised that Cboe Options Exchange (“C1”) has identified a limitation in the number of available sequenced messages on the Multicast PITCH proprietary market data feeds for Matching Unit 34 supporting SPXW. Due to an increase in market activity, the potential exists to exceed this allowable number during the course of today’s trading. Should C1 exceed 70% of this value, additional notification will be provided to market participants.

Note that this issue only impacts SPXW market data; all other systems not related to SPXW market data, including all systems supporting SPX, will continue to operate normally.

All proprietary Cboe market data feeds support a four (4) byte decimal sequence number which has a max value of 4,294,967,295. In the event C1 exceeds the maximum allowed sequence messages on the Multicast PITCH feed for Matching Unit 34 supporting SPXW, the C1 proprietary TOP and PITCH market data feeds for the SPXW simple order book will become unavailable for the remainder of the day. SPXW simple order book market data will remain available to market participants via OPRA; SPXW proprietary complex order book market data and COA market data will also remain unaffected.

In addition, the SPXW simple order book market data available to the trading floor will be impacted. Additional detail regarding the exact nature of that impact will be provided to all market participants as it becomes available.

Please contact the Cboe Trade Desk or your director of sales with any questions.

Cboe Trade Desk
[email protected]