Phillips 66 is an energy manufacturing and logistics company with midstream, chemicals, refining and marketing, and specialties businesses.
CenterPoint Energy is a company engaged in electric transmission and distribution, natural gas distribution, and natural gas sales and services.
Noble Energy is an independent oil and natural gas exploration and production company.
Apache Corporation is an independent energy company that explores, develops and produces natural gas, crude oil and natural gas liquids.
ConocoPhillips is an independent exploration and production company focused on proven reserves and production of liquid and natural gas.
Marathon Oil is an independent oil and natural gas exploration and production company.
Carbo Ceramics provides products and services to the oil and gas, and industrial markets.
Spectra Energy Partners, LP (NYSE: SEP) is a Houston-based master limited partnership, formed by Spectra Energy Corp.
Occidental Petroleum Corporation is an oil and gas exploration and production company.
Enterprise Products Partners is a company providing midstream energy services.
Calpine Corporation is a company engaged in the generation of electricity from natural gas and geothermal resources.
EOG Resources explores for, develops, produces and markets crude oil and natural gas primarily in major producing basins.