05/31/2007
As a reminder, on the close of business Friday, June 1, 2007 the short option minimum margins for Crude Oil, Heating Oil, RBOB Gasoline, and Natural Gas Calendar Spread Options, Heating Oil and RBOB Gasoline Crack Spread Options, RBOB Gasoline Options, and Crude Oil, Heating Oil, and RBOB Gasoline Average Price Options will increase from $10 to $15. A second increase of $5 will be implemented effective close of business Monday, July 2, 2007 to $20. The last increase of $5 will be implemented effective Close of Business Wednesday, August 1, 2007 to $25.