Devon Energy

Devon Energy Corporation is an independent energy company specializing in exploring, producing, and developing oil and natural gas resources.

Freeport-McMoRan

Freeport-McMoRan Inc., commonly known as Freeport, is a prominent American mining company headquartered that has grown into one of the world's largest copper and other minerals producer.

Pioneer Natural Resources

Pioneer Natural Resources Company, commonly known as Pioneer, is a prominent American energy company that has become a leading independent exploration and production (E&P) company focused on exploring and developing oil and natural gas resources.

EOG Resources

EOG Resources, Inc. is a prominent American energy company that has grown into one of the largest independent exploration and production (E&P) companies in the United States; it specializes in exploring, developing, producing, and marketing crude oil, natural gas, and natural gas liquids (NGLs).

Occidental Petroleum

Occidental is one of the largest independent oil and gas exploration and production companies in the United States.

ConocoPhillips

ConocoPhillips is a global energy company engaged in the exploration, production, refining, and marketing of oil and natural gas.