While all Cboe systems are currently operating normally, please be advised that Cboe C1 Options Exchange surpassed 90% of the maximum allowable sequenced messages on its Multicast PITCH proprietary market data feeds for Matching Unit 34 supporting SPXW at approximately 2:34 pm CT today due to current market activity. Should C1 exceed 95% of this value, additional notification will be provided to market participants. Based on current trading activity, the potential exists to exceed this allowable number for matching unit 34 supporting SPXW during the course of today’s trading at a non-predetermined time.

In the event C1 exceeds the maximum allowed sequence messages on the Multicast PITCH feed for Matching Unit 34, SPXW market data will remain available and unaffected via the proprietary Multicast TOP feed, complex order book market data feed, and COA market data feed, as well as via PAR market data systems and the floor data walls. In addition, SPXW market data will remain available to market participants via OPRA. However, the C1 proprietary Multicast PITCH market data feed for SPXW will become unavailable for the remainder of the day.

As indicated in a previous notice, Cboe has identified a limitation in the number of available sequenced messages on the C1 Multicast PITCH proprietary market data feed. This is a result of all proprietary Cboe market data feeds supporting a four (4) byte decimal sequence number which has a maximum value of 4,294,967,295. This situation continues to be monitored closely while a long term sequence rollover solution, detailed in a previous notice, is being implemented.

Note that this issue only impacts the proprietary Multicast PITCH market data feed for SPXW; all other systems not related to SPXW Multicast PITCH market data, including all systems supporting SPX, continue to operate normally. Note also that Cboe does not intend to close trading early in SPXW or any other classes today, nor are there plans to cease floor trading for SPXW or any other class.

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

Cboe Trade Desk
[email protected]