Oil companies

Chevron is an energy and technology company.

ConocoPhillips is an independent exploration and production company focused on proven reserves and production of liquid and natural gas.

Marathon Petroleum Corporation (MPC) is a petroleum product refining, marketing, retail, and midstream company.

Valero Energy is a petroleum refining and marketing company.

Marathon Oil is an independent oil and natural gas exploration and production company.

Sunoco is a growth-oriented master limited partnership that primarily deals with the distribution of motor fuel to convenience stores, independent dealers and commercial customers.

Glencore (formerly known as Glencore Xstrata) is a diversified natural resources company engaged in the production, refinement, processing, storage, transport, and marketing of metals and minerals, energy products, and agricultural products.

WPX Energy is an independent oil and natural gas exploration and production company.

RWE is an electricity and gas company that generates, distributes, and sells electricity, as well as produces, distributes, and sells gas.

Nabors is a company that owns and operates land-based drilling rig fleets and provides offshore platform rigs.

Newpark Resources is a provider of drilling fluids systems and composite matting systems used in oilfield and other commercial markets.

Energy Transfer Operating, formerly Energy Transfer Partners, is a company engaged in the natural gas midstream and intrastate transportation and storage businesses.