Auction Summary

Auction Summary messages are used to disseminate the results of an auction. An Opening or Re-Opening Auction Summary message for each symbol is sent at the conclusion of its Opening or Re-Opening auction and represents the Cboe Opening Price.

The Auction Summary message has the following format:

Table 1. Auction Summary
Field NameOffsetLengthType/(Value)Description
Length01BinaryLength of this message including this field.
Message Type110x96 Auction Summary Message
Time Offset24Time OffsetNanosecond offset from last unit timestamp.
Symbol68Printable ASCIISymbol right padded with spaces.
Auction Type141Alphanumeric
  • G=GTH Opening
  • O=RTH Opening
  • H=Halt Re-Opening
  • V=Volatility Opening
Price158Binary Long PriceAuction price.
Quantity234BinaryCumulative number of contracts executed during the auction.
Total Length=27 bytes
Cboe Titanium U.S. Options Opening Process Feed Specification - Auction Summary | Cboe