Effective for trade date Friday, May 2, 2008, the CME Group shall list for trading Binary Options on the Target Federal Funds Rate (“Fed Binaries”) that expire in October 2008.

The following table summarizes expiration months, last trading days, and expiration days for Fed Binaries listed for trading as of 2 May 2008:

Expiration Month	Last Trading Day & Expiration
June 2008	26 June 2008
August 2008	6 August 2008
September 2008	17 September 2008
October 2008	30 October 2008

The schedule for last trading day and expiration of Fed Binaries is governed by CBOT Rule 22B01.I.:

22B01.I. Last Day of Trading

The last day of trading in a Binary Option shall be the business day following the terminal day of the regularly scheduled FOMC meeting that determines the contract expiration month of said Binary Option (Rule 22B01.A.).

The last day of trading for any given Binary Option shall be set by the Exchange on the basis of the most recently published FOMC meeting calendar as of the date that such Binary Option is listed for trading by the Exchange.

The last day of trading for said Binary Option, so determined, shall remain fixed, notwithstanding such changes to the schedule of meetings of the FOMC as may occur after said Binary Option has been listed by the Exchange for trading.

Inquiries should be addressed to:

Daniel Grombacher	312.634.1583	daniel.grombacher@cmegroup.com
Jeff Kilinski	312.648.3817	jeff.kilinski@cmegroup.com
Frederick Sturm	312.930.1282	frederick.sturm@cmegroup.com