Starting Friday, September 1, 2006, the same dual trading restricted markets will be effect as last quarter, EXCEPT that the dual trading restrictions will become effective for 1^st position Live Cattle Futures, 1^st March quarterly position S&P 500^®   options and 3^rd March quarterly position One-Year Eurodollar MidCurve options.

CME reviewed historical volume data in these markets and confirmed they are now deemed mature and liquid” under CME Rule 552 – DUAL TRADING RESTRICTIONS and subject to the dual trading restrictions.  Please note that with respect to the 3^rd March quarterly position Eurodollar MidCurve options dual trading restriction, the Broker Association customer association percentage will apply.

• CME Eurodollar Futures:  Dual trading is restricted in the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth March quarterly cycle contract month position CME Eurodollar (ED) futures, up to and including the termination of trading day for the expiring contract month.
• CME Eurodollar Options: Dual trading is restricted in (1) first, second, third, fourth and fifth contract month position CME Eurodollar (ED) March quarterly cycle options; (2) first and second serial month ED options; (3) first and second position March quarterly cycle One-Year ED MidCurve options; and (4) first and second position serial month One-Year ED MidCurve options, up to but not including the last five business days of the contract month.  However, effective Friday, September 1, 2006, dual trading will be prohibited also in the third position March quarterly cycle One-Year ED MidCurve options.
• CME LIVE CATTLE FUTURES:  Dual trading is restricted in the first contract month position CME Live Cattle futures, up to and including the termination of trading day for the expiring contract month, effective Friday, September 1, 2006.
• CME S&P 500 STOCK PRICE INDEX OPTIONS:  Dual trading is restricted in the first March quarterly contract month position CME S&P 500 options, up to but not including the last five business days of the contract month, effective Friday, September 1, 2006.

Note that CME may amend this list of restricted contracts and contract months in the future.  We review historical volume data on at least a quarterly basis in order to determine those contracts and contract months that are deemed mature and liquid according to Rule 552.  The next quarterly review will occur during the period July through September 2006.  Any new restrictions on dual trading will occur only after prior notice to shareholder/members.  Dual trading will be restricted for those contracts and contract months deemed mature and liquid. 

Please refer to Exhibit I for a table of Effective Dates.

If you have any questions regarding these changes, please contact:

Market Regulation          (312) 596-0609

Thank you.