Dear CME Globex Customers,

Effective Sunday, July 9, 2006 (for trade date Monday, July 10), to simplify and improve processing, CME is reducing the maximum number of quotes a market maker can submit in a single Mass Quote message to 100. Currently, market makers can submit a maximum of 195 quotes in a single Mass Quote message.

Mass Quoting functionality is supported in CME Equity, FX and Interest Rate options products.

This change to the Mass Quote message will be available for testing in the CME certification environment Sunday, May 21, 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