Auction Notification

Auction Notification messages are used to disseminate order details of a FLEX Auction. FLEX Auctions will be available for a defined period of time known as the exposure period.

Table 1. Auction Notification
Field NameOffsetLengthType/(Value)Description
Length01BinaryLength of this message including this field
Message Type110xAD Auction Notification Message
Time Offset24Time OffsetNanosecond offset from last unit timestamp.
FLEX Instrument ID66Printable ASCIIFLEX Instrument ID right padded with spaces.
Auction ID128BinaryDay specific identifier assigned to this auction.
Auction Type201Alphanumeric
  • B=AIM
  • F=FLEX Auction
  • S=Solicitation Auction Mechanism
Side211Alphanumeric
  • B=Buy
  • S=Sell
Price228Binary Signed Long Price
  • Auction price.
  • Price will be zero for Auction Type = B and F.
  • Price will be included for Auction Type = S.
Quantity304BinaryInstrument quantity.
Customer Indicator341Alphanumeric
  • N=Non-Customer
  • C=Customer
  • FLEX Auctions (Auction Type = F) will always have a blank Customer Indicator value.
  • AIM auctions will have a blank Customer Indicator for simple options while AIM auctions for complex options series will include a Customer Indicator.
ParticipantID354AlphanumericExecuting Broker (optional) of firm attributed to this auction.
  • Auction End
  • Offset
394BinaryNanosecond offset from last timestamp.
Client ID434AlphanumericUser defined identifier for quote attribution.
Total Length=47 bytes
Cboe Titanium U.S. Options FLEX Feed Specification - Auction Notification | Cboe