Jack Harper

Unocal Corp. explores, develops, produces, and markets crude oil and natural gas. The firm also produces geothermal energy in Indonesia and the Philippines and makes petroleum coke, graphite's and silicon carbide materials. The company was founded on October 17, 1890 and is headquartered in El Segundo, CA.

Pure Resources, Inc. develops, explores, and acquires oil and gas properties. Its properties are located in the Permian Basin of West Texas, southeastern New Mexico, and the San Juan Basin of New Mexico. The company is headquartered in Midland, TX

RSP Permian, Inc. was an oil and natural gas company, which was focused on the exploration and production of unconventional oil and associated liquids-rich natural gas reserves in the Permian Basin of West Texas. The company was founded in October 2010 and was headquartered in Dallas, TX.

Tom Brown, Inc. engages in the exploration for and the acquisition, development and production of, natural gas, natural gas liquids and crude oil. It also engages in the marketing, gathering, processing and sale of natural gas and the drilling of gas and oil wells. The company is headquartered in Denver, CO

Concho Resources, Inc. engages in the acquisition, development and exploration of oil and natural gas properties. Its operations include Delaware Basin, and Midland Basin. The company was founded on February 22, 2006 and is headquartered in Midland, TX.

RSP Permian LLC engages in the acquisition, exploration, development, and production of oil and natural gas resources. The company was founded by Steven D. Gray, Michael K. Grimm and William Huck on October 18, 2010 and is headquartered in Midland, TX.