In order to facilitate faster, more efficient and accurate processing of order messages, CME Globex will be expanding Client Order ID’s to 20 bytes in February 2009.  In an effort to harmonize the field lengths between CME Globex and Clearing 21, CME Clearing is preparing to handle Client Order ID’s (“Card/Order Number”) up to 20 bytes in length as well.

This means that beginning February 1, 2009, FIXML trade messages sent by CME Clearing may contain order ID’s (ClOrdID attribute in FIXML) of up to 20 bytes in length.  The change is meant to improve efficiency of order handling in front-end systems, by allowing unique ID’s (primarily numeric, and thus the large size), for each and every message passed to CME Globex.

If you have any questions or concerns, please contact CCS at CCS@cmegroup.com, or call CCS at 312-207-2525.

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