Source: Quarterly financial reports with the Securities and Exchange Commission, or if necessary, statements signed by company officials and provided to NGI.

Companies providing data directly to NGI included Chevron Corp., ConocoPhillips, Constellation Energy Commodities Group, Shell Energy NA, Louis Dreyfus Energy Services LP, Merrill Lynch Commodities, Tenaska Marketing Ventures and UBS Energy. *Certain companies' marketing data was published in every quarterly survey in 2007 but not in every survey in 2006. Those that qualified for only a portion of the 2006 surveys included Canadian Natural Resources, XTO Energy, CenterPoint Energy, Apache Corp. and El Paso Corp. BP plc, which resumed reporting to this survey for 4Q2007, is believed to be the largest North American Gas Marketer by a wide margin.

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