Notice No. 581a
November 14, 2008

Expansion of Listed Months for Five Natural Gas Liquids (NGL) Swaps

Please be advised that beginning on Tuesday evening, November 18, 2008 (for trade date Wednesday, November 19), the Exchange will expand its contract listing to 39 consecutive months on ClearPort® Clearing and Trading, for the following contracts:

New NGL Contracts	Code	Rule Chapter
Conway Propane (OPIS) Swap	W1	584
Mont Belvieu Natural Gasoline (OPIS) Swap	W3	585
Mont Belvieu Ethane (OPIS) Swap	W8	586
Mont Belvieu Isobutane (OPIS) Swap	Y2	587
Mont Belvieu Normal Butane (OPIS) Swap	Z2	588

Should you have any questions or require any further information, please contact ExchangeInformation@cmegroup.com