Effective Sunday, October 15, 2006 (trade date Monday, October 16, 2006), the Instrument Group Codes for CME Equity options spreads will be consolidated to simplify listing groups in the CME Equity product complex.  Unique Instrument Group Codes will be assigned, by product, for all exchange-defined CME Equity options spreads.  The Instrument Group Code is found in positions 70-71 in the Instrument Creation (MO) market data message.

In order to effect this change, all resting GTC and GTD orders in CME Equity options markets will be eliminated at the close of the CME Globex^® session on Friday, October 13.

Please view the attached memo for more information.