Effective Sunday, May 21, 2006 (for trade date Monday, May 22), to reduce bandwidth utilization, CME is eliminating all Delete N Lines (MC) and Market Sheet (MF) market data messages.

CME currently disseminates both the Five Best Bids/Offers (MA) message and the MC and MF messages for the CME Russell 2000®, CME NASDAQ-100®, CME S&P 500® and CME S&P MidCap 400® futures, providing both full-depth and five-deep market data for these products.

The MA message will continue to be disseminated for all CME products, providing top-five market data.

If you have any questions regarding this notice, please contact:

Marilee Radecki    312.930.8193    mradecki@cme.com
Kevin Brady          312.648.3653    kbrady@cme.com

Thank you.