Dear CME Globex Customers,

On Sunday, January 29, 2006 (for trade date Monday, January 30) and February 5 (for trade date Monday, February 6), CME will phase in the removal of contra-party Trader IDs in FIX tag 337 from CME Globex execution messages. Instead, tag 337 will contain the generic value "TRADE".

There is no change to FIX tag 375, contra-party Subscriber ID. Tag 375 in CME Globex execution messages will continue to be disseminated with the contra-party clearing firm number.

This change to the CME Globex execution messages will be available for testing in the CME certification environment January 3, 2006.

If you have any questions or concerns, please contact your CME Globex Account Manager at 312.634.8700; or in Europe at +44.207.623.2550.

Thank you,

CME