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UDP Feed A and UDP Feed B are used to disseminate CME Group incremental market data (including instrument definitions) using encoded packets containing the following FIX market data messages. message types:

  • Security Definition (tag 35-MsgType=d)
  • Market Data Security Status (tag 35-MsgType=f)
  • Market Data Incremental Refresh (tag 35-MsgType=X)
  • Request for Quote (tag 35-MsgType=R)

All packets are sent through both UDP Feed A and UDP Feed B applicable Market Data Groups. This redundancy minimizes the chance of message loss due to UDP. 


UDP Feed A and UDP Feed B should be used for arbitration.