G. Burford

Cimarex Energy Co. is an independent oil and gas exploration and production company. Its activities include drilling, completing and operating wells. It operates through the following areas: Permian Basin, Mid-Continent, and Others in Oklahoma, Texas and New Mexico. The company was founded by F. H. Merelli in February 2002 and is headquartered in Denver, CO.

Whiting Petroleum Corp. engages in the development, production, acquisition, and exploration of oil and gas properties. It operates in the Rocky Mountains regions. The company was founded by Kenneth R. Whiting and J. Bert Ladd in January 1980 and is headquartered in Denver, CO.

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