While EnCana and four others fell in the rankings, five rose: Penn West Petroleum, Talisman Energy, Suncor Energy, Canadian Natural Resources and Husky Energy.

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Many of the energy companies, such as Chesapeake Energy ( CHK), Marathon Oil ( MRO), Suncor Energy ( SU), Murphy Oil ( MUR), Williams ( WMB), and El Paso ( EP) all report this week.

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Customers include Chevron , ConocoPhillips , Suncor Energy , Kinder Morgan Energy , Valero Energy and Sunoco .

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