TrueSize Quote Message Fields

The Quote message provides TrueSize which is the sum of the sizes from each participant at the NBBO (National Best Bid and Offer) price.

Table 1. TrueSize Quote Message Field
Field NameValue/TypeDescription
SymbolAlphanumericOSI Symbol
Sequence NumberIntegerPublished sequence number from Cboe, monotonically increasing
Source Sequence NumberIntegerSequence number corresponding to the underlying source quote of the bid or ask data present.
Publish TimestampIntegerNanoseconds since epoch, corresponding to the time at which the AVRO message was encoded
Source TimestampIntegerNanoseconds since epoch corresponding to the underlying source quote of the bid or ask data present
Message FlagsBit Field
  • 0 - Normal update
  • 1- refresh update (refreshes only)
  • 0x40000000, initial image (quote / trade / refresh)
  • Other values reserved for future use
Bid PricePriceTrueSize determined best bid price
Bid SizeIntegerAggregate bid quantity available across regional exchanges at the TrueSize determined best bid price
Ask PricePriceTrueSize determined best offer price
Ask SizeIntegerAggregate offer quantity available across regional exchanges at the TrueSize determined best offer price
Cboe Titanium U.S. Options Lite Feed Specification - TrueSize Quote Message Fields | Cboe