Dear CME Globex Customers,

This weekend, to better support customer trading, CME will complete internal configuration updates that will cause changes to certain existing ISIN codes. If your front-end system requires it, customers must purge their instrument databases for both the CME certification and production environments and re-populate using new Instrument Creation (MO (m-oh)) market data messages. Please contact your front-end system provider for more information.

The new MO market data messages for the CME certification and production environments will be published before the start of trading on Sunday, June 18, on the administrative channel 2, and on the MO replay on channels 1 and 16 of the CME Market Data Platform; and via the CME Market Data API.

Any legacy systems that still rely on the ftp.cme.com files for their instrument databases will be able to download the updated files on Sunday as well. CME strongly recommends all customer applications rely directly on the MO messages for the most complete and up-to-date instrument information.

If you have any questions or concerns, please contact the CME Globex Control Center (GCC) at 312.456.2391.

Thank you,

CME