Jack Stark

Continental Resources, Inc. is an independent oil producer engaged in the exploration, development, and production of crude oil and natural gas. The firm's operations include horizontal drilling and protecting groundwater. The company was founded by Harold G. Hamm in 1967 and is headquartered in Oklahoma City, OK.

Pacific Enterprises, Inc. owns and operates natural gas distribution systems. The company was founded in 1986 and is headquartered in San Diego, CA.

Cypress Environmental Partners LP engages in the provision of essential midstream services. The firm's services include pipeline inspection, integrity and hydrostatic testing services to energy companies and vendors. It operates through the following segments: Pipeline Inspection, Pipeline & Process and Water & Environmental Services. The Pipeline Inspection Services segment provides inspection and integrity services on a variety of infrastructure assets, including midstream pipelines, gathering systems and distribution systems. The Pipeline & Process Services segment provides midstream services including hydrostatic testing services and chemical cleaning related to newly-constructed and existing pipelines and related infrastructure. The Water & Environmental Services segment owns and operates Environmental Protection Agency Class II saltwater disposal facilities in the Williston Basin region of North Dakota. The company was founded by Peter C. Boylan III and Charles C. Stephenson Jr. in March 2012 and is headquartered in Tulsa, OK.

Cities Service Co. explores for and produces oil and gas. The company is based in Tulsa, OK. Cities Service was acquired by Occidental Petroleum Corp. on December 31, 1982 for $4,115.60 million.

Part of Marathon Oil Corp., Texas Oil & Gas Corp. is an oil and gas exploration and American production company. Texas Oil & Gas was acquired by USX Corp. /Old/ on February 28, 1986 for $4,094.40 million.

Oklahoma Independent Petroleum Association operates as an oil and natural gas association. The company was founded in 1955 and is headquartered in Oklahoma City, OK.