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Zenas Energy Corp. explores, produce, and develops oil and gas properties. The company was founded in 2005 and is headquartered in Calgary, Canada.

Sintana Holdings Corp. engages in the petroleum and natural gas exploration and development. Its exploration strategy is to acquire, explore, develop and produce superior quality assets with significant reserve potential. Sintana Holdings was founded on September 7, 2006 and is headquartered in Plano, TX.

Part of Freehold Royalties Ltd., Petrovera Resources Ltd. explores for and develops heavy oil resources. The company is based in Calgary, Canada. Petrovera Resources was acquired by Freehold Royalty Trust from Canadian Natural Resources Ltd. on May 10, 2005 for $277.68 million.

Kosmos Energy LLC provides oil and gas exploration services. Its areas of operations include ghana, jubilee field, morocco, portugal and senegal. The company was founded in 2003 and is headquartered in Dallas, TX.

S E Land Plc explores and produces oil and gas properties in North America. The company has exploration and production projects in Kansas and Oklahoma, which it is operating and developing in conjunction with its joint venture partner Metro Energy Group. It was founded in 2005 and is headquartered in London, the United Kingdom.

Ryder Scott Co. LP is an oil and gas engineering and geological consulting company based in Houston, TX with subsidiaries in the United States. The private company performs enhanced recovery studies, feasibility reports, fluid injection project designs, horizontal drilling studies, and evaluates oil and gas properties. The company also provides expert witness testimony and technical research & analysis to assist in the preparation of legal cases. Ryder Scott's mission is to provide independent and expert guidance to their clients with the utmost professionalism and integrity, while their vision is to be the preferred oil and gas engineering and geological consultants, known worldwide for quality, reliability, and integrity.

Society of Petroleum Engineers, Inc. provides petroleum engineering services. The non-profit company is based in Allen, TX and has subsidiaries in United States, India and Canada.

Central Energy GP LLC distributes, transports, and markets liquefied petroleum gas. The company is headquartered in Dallas, TX.

Association of Professional Engineers & Geoscientists of AB is a non profit organization that regulates the practices of engineering and geoscience in Alberta. Its function is licensing individuals and companies that want to practice engineering and geoscience in Alberta. The applicants and companies that meet APEGA’s standards for ethical, professional, and technical competency earn the right to practice and use reserved titles and designations. The company was founded in 1920 and is headquartered in Edmonton, Canada.

Crusader Energy Group, Inc. explores for oil and natural gas. The company was founded on July 3, 2008 and is headquartered in Oklahoma City, OK.

Northbrook Energy LLC develops, owns and operates hydroelectric assets. The firm services include asset acquisition, project development; project funding, financial analysis, legal, financial, and technical due diligence reviews, feasibility studies; engineering and design, rehabilitation, optimization, facility management, operations and maintenance, regulatory management, power marketing, and specializes in renewable energy credit market. The company was founded by Keith D. Spickelmier and is headquartered in Scottsdale, AZ.

Santa Maria Petroleum, Inc. engages in the acquisition, exploration, evaluation and development of mineral properties in Colombia. It operates through the Canada and Colombia geographical segments. The company was founded on October 15, 2004 and is headquartered in Toronto, Canada.

Cona Resources Ltd. is a crude oil production and development company, which engages in the exploration, acquisition, development, and production of petroleum and natural gas reserves. The company was founded on November 18, 2009 and is headquartered in Calgary, Canada.

Mobius Resources, Inc. is an exploration company, which engages in the acquisition and exploration of oil and natural gas properties. The company's assets are located in the Duvernay and Nordegg light oil plays in Alberta where the company holds approximately 61,000 net acres. The company was founded on June 12, 2008 and is headquartered in Calgary, Canada.

Bellwether Resources International, Inc. is an American company that manufactures and distributes drilling accessories. The private company is based in Dallas.