Harold Hamm

Hiland Holdings GP LP was engaged in gathering, compressing, dehydrating, treating, processing, and marketing natural gas and fractionating natural gas liquids. It maintained natural gas gathering systems, processing plants, treating facilities, and NGL fractionation facilities. The company was founded in 1990 and was headquartered in Enid, OK.

Complete Production Services, Inc. provides specialized completion and production services and products focused on helping oil and gas companies develop hydrocarbon reserves, reduce operating costs and enhance production. The company operates through two reportable business segments: Completion and Production Services and Drilling Services. The Completion and Production Services segment maintains and enhances the flow of oil and gas throughout the life of a well. This segment is divided into three primary service lines: The Intervention Services include coiled tubing units, pressure pumping units, nitrogen units, well service rigs, snubbing units and a variety of support equipment. The Downhole and Wellsite Services include electric-line, slickline, production optimization, production testing, rental and fishing services. The Fluid Handling unit provides a variety of services to help its customers obtain, move, store and dispose of fluids that are involved in the development and production of their reservoirs. The Drilling Services segment provides services and equipment that initiate or stimulate oil and gas production by providing land drilling and specialized rig logistics services. This segment also provides repair work and fabrication services for its customers at a business located in Gainesville, Texas. Complete Production Services owns and operates regional field facilities located in the U.S. Rocky Mountain region, Texas, Oklahoma, Louisiana, Arkansas, Pennsylvania, western Canada, Mexico and Southeast Asia. The firm changed its name from Integrated Production Services, Inc. to Complete Production Services, Inc. on September 12, 2005. It was founded on May 22, 2001 and is headquartered in Houston, TX.

Part of Harold Hamm H.J. Trust, Continental Gas, Inc. is a company that produces gas. The company is based in Carmen, OK. Continental Gas was acquired by Harold Hamm H.J. Trust from Continental Resources, Inc. on July 21, 2004 for $22.60 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.

Hiland Partners LP is a midstream energy partnership engaged in purchasing, gathering, compressing, dehydrating, treating, processing and marketing natural gas and the fractionating, or separating, and marketing natural gas liquids. Hiland Partners also provides air compression and water injection services to Continental Resources, Inc., a publicly traded exploration and production company controlled by affiliates of Hiland Partners' general partner for use in its oil and gas secondary recovery operations. The company's operations are primarily located in the Mid-Continent and Rocky Mountain regions of the United States. In the Partnership's midstream segment, it connects the wells of natural gas and crude oil producers in its operating areas to its gathering systems, treats natural gas to remove impurities, processes natural gas for the removal of NGLs, fractionates NGLs into NGL products and provides an aggregate supply of natural gas and NGL products to a variety of transmission pipelines and markets. The company is headquartered in Enid, OK.