Pioneer Southwest Energy Partners L.P. (NYSE: PSE) is a Delaware limited partnership formed by Pioneer Natural Resources Company (NYSE: PXD) to own and acquire oil and gas assets in Pioneer Southwest's area of operations, which consists of onshore Texas and eight counties in the southeast region of New Mexico. Pioneer Southwest's assets currently consist of non-operated working interests in approximately 1,100 identified producing wells in the Spraberry field in the Permian Basin of West Texas, with approximately 23 MMBOE of proved reserves as of December 31, 2008. Pioneer Southwest owns a 78% average working interest in these wells, and Pioneer Natural Resources is the operator. According to the Energy Information Administration, the Spraberry field is the fifth largest oil field in the United States and the only large onshore oil field that is growing. Recently published production information identifies Pioneer Natural Resources as the largest operator in the field, and Pioneer Southwest expects to benefit from that experience and scale of operations.

Insignia Energy Ltd.is oil and gas exploration and development company. Insignia Energy Ltd. focuses on finding and exploiting high quality, long-lived reserves in properties in northern, eastern, and central Alberta. Insignia Energy produces about 3,300 barrels of oil equivalent per day of natural gas. Insignia Energy Ltd. has proved reserves in 7.9 million barrels of oil equivalent and an undeveloped land base of 235,000 net acres. In 2008 Insignia Energy completed a reverse takeover of Flagship Energy. In 2009 it expanded further, acquiring fellow explorer Grey Wolf Exploration.

Manas Petroleum is a Baar, Switzerland headquartered international oil exploration and development company. It was founded as a private company in 2004 and during its first two years spent approximately $7 million acquiring and advancing its Kyrgyz, Tajik and Albanian projects. Its portfolio now totals more than 5 million acres in 5 countries. Manas Petroleum Corporation, which focuses on about 3 million acres of land in Chile, Kyrgyzstan, and Albania, typically acquires exploration rights and then, in an effort to keep costs down, farms out its development operations to local third parties. Manas often collaborates with Australian oil and gas company Santos for its activities.

Unit Corporation operates as a contract drilling company. The company operates in three segments: Contract Drilling, Oil and Natural Gas, and Mid-Stream. The Contract Drilling segment engages in the land contract drilling of natural gas and oil wells. Unit Corporation has operations in the provinces of Oklahoma, Texas, Louisiana, Wyoming, Colorado, Utah, and North Dakota. The Oil and Natural Gas segment involves in the exploration, development, acquisition, and production of oil and natural gas properties. Unit Corporation producing oil and natural gas properties, undeveloped leaseholds, and related assets are located primarily in Oklahoma, Texas, Louisiana, and New Mexico, as well as in Arkansas, North Dakota, Colorado, Wyoming, Montana, Alabama, Kansas, Mississippi, Michigan, Pennsylvania, Maryland, and a small portion in Canada. The Mid-Stream segment engages in buying, selling, gathering, processing, and treating natural gas. Unit Corporation operates 3 natural gas treatment plants, 8 operating processing plants, 33 active gathering systems, and 839 miles of pipeline in Oklahoma, Texas, Kansas, and Pennsylvania. Unit Corporation also operates a total fleet of 130 drilling rigs. The company was founded in 1963 and is based in Tulsa, Oklahoma.

TransGlobe Energy Corporation was founded in 1968 and is headquartered in Calgary, Canada. TransGlobe Energy Corporation engages in the exploration, development, and production of crude oil, natural gas liquids, and natural gas the Arab Republic of Egypt and the Republic of Yemen. TransGlobe Energy Corporation has interests in two production sharing concessions in Egypt; and five production sharing agreements in Yemen. The company was formerly known as Dusty Mac Mines, Ltd. and changed its name to TransGlobe Energy Corporation in April 1996 as a result of its business focus shift from mineral exploration and extraction to oil and gas business. TransGlobe Energy Corporation has interests in seven international blocks totaling 4.9 million acres, with active programs of exploration and development drilling underway.

Mariner Energy, Inc. was incorporated in 1983 and is headquartered in Houston, Texas with additional offices in Midland, Texas; and Lafayette, Louisiana. the independent explores in both the deep and shallow waters of the Gulf of Mexico, where Mariner Energy, Inc. has the bulk of its proved reserves. But the landlocked Permian Basin of West Texas is also an area of focus. Mariner Energy sees this diversified portfolio as a key strategic asset, allowing the company to work in two distinct exploration environments. In 2008 Mariner Energy, Inc. reported estimated proved reserves of 974 billion cu. ft. of natural gas equivalent. In late 2009 Mariner Energy acquired bankrupt Edge Petroleum for about $260 million.

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.

Bankers Petroleum Ltd. is a Canadian-based oil and gas exploration and production company focused on maximizing the value of its heavy oil assets in Albania. Bankers Petroleum Ltd. is targeting growth in production and reserves through application of new and proven technologies by a strong experienced technical team. Bankers main operations are in Albania (located northwest of Greece in South Eastern Europe). Bankers Petroleum Ltd. has oil exploration and production operations in the southeastern European country of Albania. Bankers has about 200 active oil wells and the leased rights from the Albanian government to extract crude from two large oil reserves near the Adriatic Sea. Patos Marinza, Europe's largest onshore oilfield, produces almost 7,000 barrels of oil per day from proven reserves of 2 billion barrels. The Kucova oilfield holds more than 300 million barrels of proven reserves; Bankers Petroleum expects to begin production there in 2009.

Bronco Drilling Company was founded in 2001 and is headquartered in Edmond, Oklahoma.Bronco Drilling Company, Inc. provides contract land drilling and workover services to oil and natural gas exploration and production companies in the United States and Mexico. As of February 28, 2009, Bronco Drilling Company owned a fleet of 56 land drilling rigs operated in Oklahoma, Texas, Colorado, Utah, North Dakota, Louisiana, and Mexico; owned a fleet of 61 workover rigs operated in Oklahoma, Texas, Kansas, Colorado, Louisiana, and New Mexico; and owned a fleet of 63 trucks and related transportation equipment to transport drilling rigs to and from drilling sites. Bronco Drilling Company markets its drilling and workover rigs through employee marketing representatives.

Sterling Resources Ltd. is a Calgary based, publicly traded, energy company engaged in the exploration, development and production of crude oil and natural gas in selected areas of the world. The exploration and production independent explores for, develops, and produces crude oil and natural gas, primarily in the UK but also in France and Romania. In the UK Sterling Resources has prospects (27 blocks and 15 licenses) offshore in the North Sea. Sterling Resources Ltd. also holds an interest in a license to explore in the Aquitaine Basin of southern France and has interests in both onshore and offshore projects in Romania. In 2006 Sterling Resources Ltd. reported proved reserves of 1.1 million barrels of oil equivalent.

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