W. Ralls

SESI LLC engages in provision of oil field and equipment services. The company is headquartered in Houston, TX.

Enterprise GP Holdings LP explores and produces natural gas and provides other energy related services. It offers offshore pipelines and services, onshore natural gas pipelines and services, natural gas liquid pipelines and services and petrochemical services. Enterprise GP Holdings is headquartered in Houston, TX.

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.

El Paso Pipeline Partners LP owns and operates natural gas transportation pipelines. The company was founded on November 16, 2007 and is headquartered in Houston, TX.

Rowan Cos. Ltd. engaged in the provision of offshore contract drilling services to the oil and gas industry. It operates through the following segments: Deepwater, Jack-ups, and ARO. The Deepwater segment included ultra-deepwater drill ships. The Jack-ups segment consists of self-elevating jack-up rigs. The ARO segment owned, managed, and operated offshore drilling units in Saudi Arabia. The company was founded on October 11, 2011 and was headquartered in London, the United Kingdom.

Enterprise Products GP LLC is a provider of oil-refining services. The company provides energy services to producers and consumers of natural gas, natural gas liquids, crude oil, refined products and petrochemicals. The company was incorporated in 1998 and is based in Houston, Texas.

American Petroleum Institute (API) is the only national trade association that represents all aspects of America's oil and natural gas industry. Its more than 400 corporate members, from the largest major oil company to the smallest of independents, come from all segments of the industry. They are producers, refiners, suppliers, pipeline operators and marine transporters, as well as service and supply companies that support all segments of the industry.

NCS Multistage LLC provides downhole tool-based fracturing and well stimulation services to the oil and gas industry. The firm offers coiled tubing fracturing, fracturing systems, liner hangers, casing buoyancy system, and reservoir strategies services. The company was founded by Robert Nipper and Marty Stromquist in 2008 and is headquartered in Houston, TX.

Pacific Drilling SA provides global ultra-deepwater drilling services to the oil and natural gas industry. The firm offers high-specification drillships such as Pacific Bora, Pacific Mistral, Pacific Scirocco, Pacific Santa Ana and Pacific Meltem. The company was founded on March 11, 2011 and is headquartered in Luxembourg.