Oil companies

Baker Hughes

Baker Hughes is an international industrial and oilfield service company.

Chevron

Chevron is an integrated energy and technology company.

Valero Energy

Valero Energy is an independent petroleum refining and marketing company.

Marathon Petroleum

Marathon Petroleum Corporation (MPC) is a petroleum refiner, marketer and transporter.

Hess

Hess is a global independent energy company primarily engaged in the exploration and production of crude oil and natural gas.

Noble Energy

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

Apache Corporation

Apache Corporation is an independent energy company that explores, develops and produces natural gas, crude oil and natural gas liquids.

ConocoPhillips

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

Newpark Resources

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

Marathon Oil

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

Concho Resources

Concho Resources is an independent oil and natural gas company engaged in the acquisition, development and exploration of oil and natural gas properties.

Pioneer Natural Resources Company

Pioneer Natural Resources is a large independent exploration and production company with operations in the United States.