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 include Chevron, ConocoPhillips, Constellation Energy Commodities Group, Louis Dreyfus Energy Services, Merrill Lynch Commodities, Shell Energy North America and Tenaska Marketing Ventures. BP plc did not participate in the quarterly survey in 3Q2007. UBS Energy and Lehman Brothers both dropped out of the survey. UBS Energy, which marketed 4.89 Bcf/d during 3Q2007, got out of energy trading in October. Lehman Brothers, which marketed 2.5 Bcf/d during 3Q2007, declared bankruptcy in September.

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