Ensign United States Drilling (formerly Caza Drilling) serves oil and gas companies exploring in the Western US. A subsidiary of Ensign Energy Services,Ensign United States Drilling Inc. provides contract drilling services primarily in the Rocky Mountain region. Ensign United States Drilling Inc. claims to be the second-largest and most active land-based drilling contractor in the Rockies. Ensign United States has 56 drilling rigs in operation in Colorado, Nebraska, Oklahoma, North Dakota, Utah, and Wyoming. In California the drilling contractor operates more than 20 drilling rigs, primarily in the San Joaquin, Los Angeles, and Sacramento basins.

Saras, a leading European oil refining company based in Italy, produces an average of more than 300,000 barrels of oil per day at its Sardoch refinery based off the coast of Sardinia. While oil refining represents more than half of its business, Saras also owns other energy-related companies, including a wind farm in Sardinia, a biodiesel plant in Spain, and an industrial engineering research business. The company distributes its finished products -- including gasoline, diesel, kerosene, aviation fuel -- primarily through two subsidiaries: Arcola Petrolifera, which owns several storage facilities in Italy and Spain; and Saras Energia, a chain of owned and leased retail gas stations in Spain.

EnCore Oil plc (LSE:EO.) is a UK based oil and gas exploration and production (E&P) company quoted on AIM. EnCore Oil plc focuses on the UK Central North Sea and UK onshore regions. EnCore Oil plc also has offshore operations in Ireland, the Netherlands, and Western Sahara. The company used to explore for gold and silver but shifted its focus to acquiring interests in onshore exploration licenses. Oil Quest had started a drilling program with appraisal and exploration wells on the Isle of Wight, which EnCore Oil plc held as part of a consortium that included Northern Petroleum. In a reverse takeover in 2006, EnCore Oil plc acquired the EnCore group of companies.

Sterling Energy plc was formed in October 2002 by the reversal of Sterling Energy Limited into Lepco plc, following which it was renamed Sterling Energy PLC. Oil and natural gas exploration and production company Sterling Energy is looking for sterling results from its operations in Africa (Cameroon, Gabon, Madagascar, and Mauritania) and the Middle East (Kurdistan). Sterling Energy has proved and probable reserves of more than 21.3 million barrels of oil equivalent. In 2009 Sterling Energy plc sold its interests in several producing gas fields in the Gulf of Mexico (where it also served as the operator for most of its projects) for $90 million, in order to focus on new opportunities on the African continent.

Superior Energy Services, Inc. provides specialized oilfield services and equipment to serve the production and drilling related needs of oil and gas companies. Superior Energy Services Inc. operates through three segments: Subsea and Well Enhancement, Drilling Products and Services, and Marine. The Subsea and Well Enhancement provides various services, including coiled tubing, electric line, pumping and stimulation, gas lift, well control, snubbing, recompletion, engineering and well evaluation, offshore oil and gas tank and vessel cleaning, decommissioning, plug and abandonment, and mechanical wireline services. Superior Energy Services Inc. provides mechanical wireline services in the Gulf of Mexico. This segment also manufactures and sells drilling rig instrumentation equipment. The Drilling Products and Services segment manufactures, sells, and rents equipment for use with offshore and onshore oil and gas well drilling, completion, production, and workover activities in Latin America, North America, the North Sea region, Continental Europe, the Middle East, Central Asia, West Africa, and the Asia Pacific region. Superior Energy Services Inc. drilling products and services comprise pressure control equipment, drill pipe and landing strings, connecting iron, handling tools, stabilizers, drill collars, torquing tools, and on-site accommodations. The Marine segment owns and operates a fleet of liftboats in the Gulf of Mexico and the Caribbean. As of December 31, 2009, Superior Energy Services Inc. operated a fleet of 26 rental liftboats. Superior Energy Services Inc. was founded in 1991 and is based in New Orleans, Louisiana.

Trinidad Drilling provides modern, reliable, expertly designed oil and gas drilling equipment operated by well-trained personnel. Trinidad Drilling Ltd. drilling fleet is one of the most adaptable, technologically advanced and competitive in the industry. Trinidad Drilling Ltd. provides contract drilling and workover services to a range of oil and gas companies. Trinidad Drilling operates a combined fleet of more than 160 drilling, well servicing, and preset/coring and barge rigs that have the capacity to drill to depths between 1,000 and 6,500 meters. Trinidad Drilling Ltd. has pursued a strategy of growing its operations through the acquisition of a number of smaller drilling companies and the construction of new drilling rigs. Trinidad Drilling Ltd. has operations in Canada, Mexico, and the US.

Rock Energy Inc. is a junior oil and gas company currently producing more than 3,600 boe per day (60% oil) from two main core areas (Plains/Lloydminster and West Central/Deep Basin). The oil and gas exploration and production company owns heavy oil and natural gas properties in Western Canada, primarily in Alberta and Northeastern British Columbia (the Plains). During the last four years Rock has consistently generated solid performance in production/reserves growth. In 2006 Rock delivered top-quartile finding and development costs. Rock Energy Inc. has an inventory of more than 100 drilling locations (three to four years) which includes a variety of projects generating a full range of risk and reward plays (low risk development locations to high impact exploration projects). Rock has the opportunities and the financial capacity to deliver growth for its shareholders.

Provident Energy Trust was founded in 1993 and is headquartered in Calgary, Canada. Provident Energy Trust operates as an open-ended energy income trust that owns and manages an oil and gas production business, and a natural gas liquids midstream services and marketing business. Provident Energy Trust primarily focuses on its core energy asset areas comprising Dixonville, and northwest, southern, and west central Alberta, Canada. Provident Energy Trust also extracts, processes, stores, transports, and markets natural gas liquids in central Canada and the eastern United States. In addition, Provident Energy offers fractionation, storage, loading, and marketing services to upstream producers.

Rex Energy Corporation operates as an independent oil and gas company in the Illinois Basin and the Appalachian Basin. The oil and gas exploration and production company has estimated proved reserves of 11 million barrels of oil equivalent, primarily from three regions: the Illinois Basin (in Illinois and Indiana) and the Appalachian Basin (Pennsylvania and West Virginia). Rex Energy Corporation owns interests in the Lawrence Field ASP Flood project, which is an oil recovery project located in Lawrence County, Illinois; and the Marcellus Shale drilling projects located in Pennsylvania in the Appalachian Basin. As of December 31, 2008, Rex Energy Corporation operated approximately 2,314 wells. Rex Energy Corporation has a joint venture agreement with Stonehenge Energy Resources, L.P. to build a high pressure gathering system and cryogenic gas processing plant in Butler County, Pennsylvania. Rex Energy Corporation was incorporated in 2007 and is headquartered in State College, Pennsylvania.

Since 1995, Pepco Energy Services has successfully evolved to become one of the leading providers of energy-saving and sustainable energy products and services for a wide range of energy users, including: large commercial; institutional; industrial; and government users. Pepco Energy Services currently provides services from North Carolina to Massachusetts and from New York to Tennessee and Illinois. A wholly owned, separately managed subsidiary of Pepco Holdings, Inc. (PHI), Pepco Energy Services provides both energy suppliers and large energy users such as utilities, municipalities, cooperatives and aggregators with an array of energy management services including the management of power generation assets. PHI is the energy holding company formed as a result of the merger between Pepco and Conectiv. The company delivers a combined 50,000 gigawatt hours of power to nearly 1.9 million customers in Delaware, the District of Columbia, Maryland and New Jersey, making it one of the largest electricity delivery companies in the Mid-Atlantic region.

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