Date:                           October 12, 2007

Recipients:                 Members and Independent Software Vendors

Authorized by:            Jeffrey S. Hersh

Title:                            Revised Daily Settlement Procedures for 10 Yr U.S. Treasury Note Option Contracts

Action Date:               October 17, 2007

Recommended for:    All Departments

Related Bulletins:      n/a

Attachment:                n/a

SUMMARY:

A Notice has been issued regarding Revised Daily Settlement Procedures for 10 Year U.S. Treasury Option Contracts.

Questions or comments regarding this notice should be directed to the following individuals:

Market Regulation

Shelly Goodwin, Manager                                 (312) 347-4123           Shelly.Goodwin@cmegroup.com

Michael Banys, Experienced Daily Investigator  (312) 435-7197           Michael.Banys@cmegroup.com

e-cbot Market Operations

Brian Wolf, Associate Director                         (312) 347-5609           Brian.Wolf@cmegroup.com

Please contact Market Operations (312-347-4600) or your Key Account Manager if you have any questions about this Bulletin.