Fractional Symbol Summary Message Fields

The Fractional Symbol Summary message delivers the Cboe consolidated best bid/offer and total executed volume across all equities books.

Table 1. Fractional Symbol Summary Message Fields
Field Name	JSON	Value/Type	Description
messageType	m	Alphanumeric	S2
timestamp	ts	Integer	Timestamp of the last matching engine message that updated the quote information for this symbol in the Cboe One server’s cache. Encoded as the number of nanoseconds since midnight (effective 11/02/26, since epoch).
symbol	sy	Alphanumeric	Relevant symbol.
cumulativeVolume	cv	Integer	Cumulative number of shares traded today across all Cboe books.
bestBidPrice	Bb	Price	Cboe Consolidated best bid price.
bestBidSize	Bs	Integer	Cboe Consolidated number of buy-side shares available for this symbol.
bestAskPrice	Ba	Price	Cboe Consolidated best ask price.
bestAskSize	As	Integer	Cboe Consolidated number of sell-side shares available for this symbol.
nationalVolume	sv	Volume	Cumulative number of shares traded today as reported to the CTA and UTP SIPs.
flags	f	Bit Field	Bit 0: SIP Volume Status 0: SIP volume data is complete. 1: SIP volume data may not be complete due to an unrecoverable gap on the incoming feed Bits 1-7: Reserved