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LINN ENERGY LLC (LINE)

Linn Energy, LLC, through its subsidiaries, engages in the development and acquisition of gas and oil properties in the United States. The company has oil and gas reserves in the Appalachian Basin, which includes West Virginia, Pennsylvania, and Virginia; Western comprising the Brea Olinda field of the Los Angeles Basin in California; and the Mid-Continent, which includes the Sooner Trend of north central Oklahoma and the Texas portion of the Hugoton-Panhandle Field. As of December 31, 2006, Linn Energy had proved reserves of approximately 454.1 billion cubic feet equivalent of gas and oil, as well as operated 1,943 and 431 net oil and gas wells. It also performs gas gathering activities for third party producers. The company was founded in 2003 and is based in Houston, Texas.


CONTANGO OIL & GAS COMPANY (MCF)

Contango Oil & Gas Company operates as an independent natural gas and oil company. It engages in the exploration, development, production, and acquisition of natural gas and oil properties primarily offshore in the Gulf of Mexico, the Fayetteville Shale in Arkansas, and onshore along the Gulf Coast. The company also has a 10% partnership interest in Freeport LNG Development, L.P., which develops a liquefied natural gas receiving terminal in Freeport, Texas, as well as has a 32% interest in Contango Capital Partnership Management, LLC, which invests in the alternative energy venture capital market. In addition, the company holds 42.7% interest in Republic Exploration LLC, which holds a nonexclusive license to approximately 2,030 blocks of 3-D seismic data in the shallow waters of the Gulf of Mexico; 76.1% interest in Contango Offshore Exploration, LLC, which focuses on the acquisition and reprocessing 1,775 blocks of 3-D seismic data in the Gulf of Mexico; and 50% interest in Magnolia Offshore Exploration LLC, which owns license rights to 3-D seismic data covering 600 blocks of the Gulf of Mexico continental shelf. As of September 30, 2005, the company had total proved reserves of 1,229 million cubic feet of natural gas and 70 thousand barrels of oil. Contango Oil & Gas Company was founded in 1986 and is based in Houston, Texas.


CABOT OIL & GAS CORPORATION (COG)

Cabot Oil & Gas Corporation (COGC) and its subsidiaries engage in the acquisition, exploration, development, exploitation, production, and marketing of oil and gas properties primarily in North America. It transports, stores, gathers, and purchases natural gas for resale. The company also operates gas gathering and transmission pipeline systems; and local distribution companies. It operates in five principal areas, which include Appalachian Basin, Rocky Mountains, Anadarko Basin, onshore and offshore the Texas and Louisiana Gulf Coast, and the gas basin of West Canada. As of December 31, 2004, the company had approximately 4,532 wells and approximately 1,202 billion cubic feet equivalent of proved natural gas reserves. COGC is headquartered in Houston, Texas.


EXCO RESOURCES INC (XCO)

EXCO Resources, Inc., an independent oil and natural gas company, engages in the acquisition, development, and exploitation of onshore oil and natural gas properties in North America. It principal operations are located in Texas, Louisiana, Ohio, Oklahoma, Pennsylvania, and West Virginia. As of December 31, 2006, the company's proved reserves were approximately 1.2 trillion cubic feet equivalent. It also had interest in 8,964 gross productive wells, including 957 gross productive oil wells and 8,007 gross productive gas wells. EXCO Resources was founded in 1955 and is headquartered in Dallas, Texas.


CHINA PETROLEUM & CHEMICAL CORPORATION (SNP)

China Petroleum & Chemical Corporation engages in the exploration, development, and production of oil and natural gas in the People's Republic of China. It also sells and distributes refined petroleum products, as well as operates oil refineries. As of December 31, 2004, the company had proved reserves of approximately 3,267 million barrels of crude oil and 3,033 billion cubic feet of natural gas. In addition, it produces a range of petrochemical products, including intermediate petrochemicals, synthetic resins, synthetic fiber monomers and polymers, synthetic fibers, synthetic rubber and chemical fertilizers. China Petroleum & Chemical Corp. has a joint venture agreement with Mitsui Chemicals, Inc. and BP plc. The company was founded in 2000 and is headquartered in Beijing, the People's Republic of China.


NOBLE ENERGY INC (NBL)

Noble Energy, Inc. engages in the exploration, production, and marketing of crude oil and natural gas worldwide. Its domestic oil and gas assets are located primarily offshore in the Gulf of Mexico and onshore in the Gulf Coast region. Noble Energy also has projects in Argentina, China, Ecuador, Equatorial Guinea, Israel, and North Sea. The company's wholly owned subsidiary, Noble Energy Marketing, Inc., markets a majority of its domestic natural gas and crude oil, as well as certain third-party natural gas and crude oil. As of January 1, 2005, Noble Energy had proved developed oil reserves of 1,370,461 million cubic feet and gas reserves of 168,496 thousand barrels. The company was formerly known as Noble Affiliates, Inc. and changed its name to Noble Energy, Inc. in 2002. Noble Energy is headquartered in Houston, Texas.


AMERICAN OIL & GAS INC (AEZ)

American Oil and Gas, Inc., an independent oil and natural gas company, engages in exploration, development, and production of hydrocarbon reserves primarily in the Rocky Mountain region of the United States. The company has interests in the Big Sky Project in Richland County, Montana; the Douglas Project and Krejci Oil Project in Powder River Basin, Wyoming; the South Glenburn Prospect in McHenry County, North Dakota; the Bear Creek Coal Bed Methane Prospect in Big Horn Basin, Montana; the West Rozel in Box Elder County, Utah; and the Coalbed Methane Projects in Powder River Basin, Wyoming. As of December 31, 2004, the company had proved oil and gas reserves of approximately 321,710 barrels of oil and 346,270 mcf of gas. The company was incorporated in 2000 as DrGoodTeeth.com and changed its name to American Oil & Gas, Inc. in 2003. American Oil & Gas is based in Denver, Colorado.


PLAINS EXPLORATION & PRODUCTION COMPANY (PXP)

Plains Exploration & Production Company, an oil and gas company, engages in the acquisition, development, exploration, and production of oil and gas properties in the United States. The company owns oil and gas properties in the Los Angeles and San Joaquin Basins in California; the Santa Maria Basin in California; the Gulf Coast Basin onshore and offshore Louisiana; and the Val Verde portion of the greater Permian Basin in Texas. As of December 31, 2004, it had 419.3 million barrel equivalent of oil proved reserves. As of the same date, Plains Exploration had working interests in approximately 2,620 active producing oil wells and approximately 573 active producing gas wells. The company is headquartered in Houston, Texas.


PETROQUEST ENERGY INC (PQ)

PetroQuest Energy, Inc. operates as an independent oil and gas company. It engages in the exploration, development, acquisition, and operation of oil and gas properties in Gulf Coast Basin, Texas, and Oklahoma. The company holds interest in Turtle Bayou Field and Main Pass Block 74 in Gulf Coast Basin; SE Carthage Field in Texas; and various natural gas properties in Oklahoma. As of December 31, 2006, the company had 2,731 thousand barrels of crude oil of proved oil reserves and 118,153 million cubic feet equivalent of natural gas reserves. As of the above date, it owned working interests in 16 gross producing oil wells and 571 gross producing gas wells. PetroQuest Energy was founded in 1983 and is headquartered in Lafayette, Louisiana.


CARRIZO OIL & GAS INC (CRZO)

Carrizo Oil & Gas, Inc. engages in the exploration, development, and production of natural gas and oil. The company focuses on operations in proven, producing natural gas and oil geologic trends along the onshore gulf coast in Texas and Louisiana, primarily in the Miocene, Wilcox, Frio, and Vicksburg trends. Carrizo also has interest in Barnett Shale area in north Texas and coalbed methane investment in the Rocky Mountains. As of December 31, 2004, the company operated 92 producing oil and gas wells, and had total proved reserves of 109.3 billion cubic feet of gas equivalent. Carrizo Oil was formed in 1993 and is based in Houston, Texas.


GOODRICH PETROLEUM CORPORATION (GDP)

Goodrich Petroleum Corporation and subsidiaries engage in the exploration, exploitation, development, and production of oil and natural gas. It primarily focuses on the Cotton Valley trend of east Texas and northwest Louisiana, and the transition zone of south Louisiana. The company owns working interests in 89 active oil and gas wells located in 18 fields in 4 states. Goodrich has interests in the Dirgin-Beckville, North Minden, South Henderson, and Bethany-Longstreet fields in the Cotton Valley trend of east Texas and northwest Louisiana. Its south Louisiana operations consist of Burrwood/West Delta 83 fields, Plumb Bob fields, and St. Gabriel fields. In addition, the company has interests in Mary Blevins field, and Marholl and Sean Andrew fields in eastern and southern regions of Texas. As of December 31, 2004, Goodrich had approximately 5.6 million barrels of oil proved reserves and 67.7 billion cubic feet of natural gas proved reserves. The company is headquartered in Houston, Texas.


RANGE RESOURCES CORPORATION (RRC)

Range Resources Corporation engages in the exploration, development, and acquisition of oil and gas properties primarily in the southwestern, Gulf Coast, and Appalachian regions, the United States. As of December 31, 2004, the company owned 1,890,000 net acres of leasehold and approximately 400,000 royalty acres of developed and undeveloped oil and gas property. As of the above date, the company had proved reserves of 1.18 trillion cubic feet equivalent of oil and natural gas. The company was founded in 1975. It was formerly known as Lomak Petroleum, Inc. and changed its name to Range Resources Corporation in 1998. Range Resources is headquartered in Fort Worth, Texas.


ENTERPRISE PRODUCTS PARTNERS L.P (EPD)

Enterprise Products Partners L.P., a North American midstream energy company, provides various services to producers and consumers of natural gas and natural gas liquids (NGL). The company operates in four segments: Offshore Pipelines and Services, Onshore Natural Gas Pipelines and Services, NGL Pipelines and Services, and Petrochemical Services. The Offshore Pipelines and Services owns and operates approximately 1,150 miles of offshore natural gas pipelines, approximately 800 miles of Gulf of Mexico offshore crude oil pipeline systems and 7 multipurpose offshore hub platforms located in the Gulf of Mexico, as of December 31, 2004. The Onshore Natural Gas Pipelines and Services segment owns or has interests in approximately 17,200 miles of onshore natural gas pipeline systems that provide for the gathering and transmission of natural gas in Alabama, Colorado, Louisiana, Mississippi, New Mexico, and Texas. In addition, it owns two salt dome natural gas storage facilities located in Mississippi. The NGL Pipelines and Services segment includes the natural gas processing business and related NGL marketing activities; NGL pipelines aggregating approximately 12,775 miles and related storage facilities; and NGL fractionation facilities located in Texas and Louisiana. The Petrochemical Services segment includes four propylene fractionation facilities, an isomerization complex, and an octane additive production facility. This segment also includes various petrochemical pipeline systems. Enterprise Products Partners was formed in 1968 and is headquartered in Houston, Texas.


XTO ENERGY INC (XTO)

XTO Energy, Inc., an independent oil and gas company, primarily engages in the acquisition, development, exploitation, and exploration of producing oil and gas properties in the United States. The company also produces, processes, markets, and transports oil and natural gas. The company's proved reserves are principally located in the Eastern Region, including the East Texas Basin and northwestern Louisiana; Barnett Shale of North Texas; San Juan and Raton basins of northern New Mexico and southern Colorado; and Arkoma Basin of Arkansas and Oklahoma. Its reserves are also located in Permian Basin of west Texas and southeastern New Mexico; Hugoton Field of Oklahoma and Kansas; Anadarko Basin of Oklahoma; Green River and Powder River basins of Wyoming; Uinta Basin of Utah; Middle Ground Shoal Field of Alaska's Cook Inlet; and South Texas Region. As of December 31, 2004, the company's estimated proved reserves were 4.71 trillion cubic feet of natural gas, 38.5 million barrels of natural gas liquids, and 152.5 million barrels of oil. XTO Energy was founded in 1985. The company was co-founded by Bob R. Simpson and Steffen E. Palko. It was formerly known as Cross Timbers Oil Company and changed its name to XTO Energy, Inc. in 2001. XTO Energy is headquartered in Fort Worth, Texas.


MARTIN MIDSTREAM PARTNERS L.P (MMLP)

Martin Midstream Partners L.P. provides marine transportation, terminalling, distribution, and midstream logistical services to producers and suppliers of hydrocarbon products and by-products, lubricants, and other liquids primarily in the Gulf Coast region of the United States. The company transports hydrocarbon products and by-products through its marine fleet of approximately 35 inland tank barges, 17 inland pushboats, and 2 offshore tug/barge tanker units. It owns and operates approximately 16 marine terminal facilities and 2 inland terminal facilities that provide storage and handling services for producers and suppliers of hydrocarbon products and by-products, lubricants, and other liquids. It also distributes and markets lubricants primarily to the offshore exploration and production industry. The company stores liquefied petroleum gas in its supply and storage facilities for resale to propane retailers and industrial liquefied petroleum gas users in Texas and the southeastern United States. Martin Midstream also manufactures and sells fertilizer products, which are primarily sulfur-based, and other sulfur-related products to regional wholesale distributors and industrial users. In addition, the company rents land to oil and gas companies, as well as provides storage and handling services for lubricants and fuel oil. Martin Resource Management Corporation serves as the general partner for the company. Martin Midstream Partners is based in Kilgore, Texas. Martin Midstream Partners L.P. is a subsidiary of Martin Resource Management Corporation.


DOUBLE EAGLE PETROLEUM COMPANY (DBLE)

Double Eagle Petroleum Co. engages in the exploration, development, production, and sale of crude oil and natural gas in the Rocky Mountain Basins of the western United States. It primarily explores and develops Green River Basin in southwestern Wyoming, the Powder River Basin in northeastern Wyoming, the Washakie Basin in south central Wyoming, the Wind River Basin in central Wyoming, and the Christmas Meadows area in northeastern Utah. As of December 31, 2004, the company owned interests in a total of 524 producing wells. Double Eagle Petroleum's total proved oil reserves were 278,055 Bbls and total proved gas reserves were 34,934,746 Mcf, as of the above date. The company was founded in 1972 and is headquartered in Casper, Wyoming.


NEXEN INC (NXY)

No description available.


CALCASIEU REAL ESTATE (CKX)

CKX Lands, Inc. engages in the ownership, operation, and lease of real estate holdings primarily in the United States. It leases its properties for oil and gas, raising timber, and agricultural activities. The company had 13,799 acres of land located in southwest Louisiana, of which 6,281 acres was timberland, 6,528 acres agricultural land, and 741 acres marsh land, as of December 31, 2004. In addition, it owned a mineral interest in approximately net 237 acres of 5,907 gross acres of land, as of the above date. CKX Lands was organized in 1930. It was formerly known as Calcasieu Real Estate & Oil Co., Inc. and changed its name to CKX Lands, Inc. in May 2005. The company is headquartered in Lake Charles, Louisiana.


ENBRIDGE ENERGY MANAGEMENT LLC (EEQ)

Enbridge Energy Management, L.L.C. operates as a limited partner of Enbridge Energy Partners, L.P. (partnership), which owns petroleum and natural gas midstream businesses in the United States. The partnership owns liquid petroleum pipeline, as well as engages in natural gas gathering, processing, and transmission. As of September 30, 2005, the company owned approximately 18% limited partner interest in the partnership. Enbridge Energy Company, Inc. serves as the general partner of the partnership. The company was formed in 2002 and is based in Houston, Texas.


PENN VIRGINIA CORPORATION (PVA)

Penn Virginia Corporation engages in the exploration, development, and production of oil and natural gas primarily in the eastern and Gulf Coast onshore areas of the United States. The company operates through four segments: Oil and Gas Operations, Coal Royalty and Land management Operations, Natural Gas Midstream, and Corporate and other. As of December 31, 2004, the Oil and Gas Operations segment had proved reserves of approximately 6.3 million barrels of oil and condensate and 316 billion cubit feet of natural gas, or 354 billion cubit feet equivalent. Coal Royalty and Land management Operations segment, through, Penn Virginia Resource Partners, L.P., engages in the ownership and management of coal properties. As of the above date, the segment had 558 million tons of proven and probable coal reserves. Natural Gas Midstream segment engages in gas processing, gathering, and other related services. Corporate and Other segment primarily represents corporate functions. Penn Virginia Corporation was founded in 1882 and is headquartered in Radnor, Pennsylvania.


SOUTHWESTERN ENERGY COMPANY (SWN)

Southwestern Energy Company, together with its subsidiaries, operates as an integrated energy company primarily focused on the exploration for and production of natural gas, principally in Arkansas, Oklahoma, Texas, New Mexico, and Louisiana. The company operates in three segments: Exploration and Production, Natural Gas Distribution, and Marketing. In the Exploration and Production segment, the company explores, develops, and produces natural gas and crude oil. Its portfolio includes development drilling in the Arkoma Basin and East Texas, exploration and exploitation properties in the Permian Basin of Texas and New Mexico, and in Louisiana and East Texas. As of December 31, 2004, the company's estimated proved natural gas and oil reserves were 64505billion cubic feet equivalent of gas. In the Natural Gas Distribution segment, the company's Arkansas Western Gas Company, distributes and transmits natural gas to approximately 145,000 retail customers. In the Marketing segment, the company undertakes marketing of gas production and third party natural gas that is primarily sold to industrial customers. Southwestern Energy Company was organized in 1929 and is headquartered in Houston, Texas.


THE EXPLORATION COMPANY (TXCO)

Exploration Company of Delaware, Inc. engages in the acquisition, exploration, development, and production of oil and gas properties. As of December 31, 2004, it had proved reserves of 17.7 Bcf of natural gas and 3.4 MMBbls of oil. As of the same date, the company completed drilling of 52 wells, including 27 oil wells in the San Miguel, Georgetown, Glen Rose, and Red River formations; and 25 gas wells in the Glen Rose, Georgetown, and Pearsall formations in southwest Texas. The company also owns properties in South Dakota, North Dakota, and Montana. The company was incorporated in 1979 and is headquartered in San Antonio, Texas.


DEVON ENERGY CORPORATION (DVN)

Devon Energy Corporation primarily engages in the exploration, development, and production of oil and gas. It also acquires producing properties; transports oil, gas, and natural gas liquids (NGLs); and processes natural gas. The company operates in Permian Basin, the Mid-Continent, the Rocky Mountains, and onshore and offshore Gulf Coast, the United States; western Canadian Sedimentary Basin in Alberta and British Columbia; and in Azerbaijan, China, and Egypt, as well as in west Africa. In addition, Devon markets natural gas, crude oil, and NGLs; and constructs and operates pipelines, storage and treating facilities, and gas processing plants. As of December 31, 2004, the company's estimated proved reserves were 2,077 million barrel of oil equivalent, of which 60% were natural gas reserves, and 40% were oil and NGL reserves. It sells its gas production to various customers, including pipelines, utilities, gas marketing firms, industrial users, and local distribution companies. Devon was founded in 1971 and is headquartered in Oklahoma City, Oklahoma.


ENCANA CORPORATION (ECA)

EnCana Corporation engages in the exploration, production, and marketing of natural gas, crude oil, and natural gas liquids (NGL) in Canada, the U.S., Ecuador, and the United Kingdom. The company operates in two divisions, Upstream, and Midstream and Marketing. The Upstream division manages the company's exploration, development, and production of natural gas, NGL and crude oil, and other related activities. The Midstream and Marketing division engages in natural gas storage, NGL processing, and power generation operations, as well as the sale and delivery of produced product, and the purchase of third party product. EnCana had net proved reserves of approximately 10.5 trillion cubic feet of natural gas and 501 million barrels of crude oil and NGLs, as of December 31, 2004. EnCana Corporation was founded in 1971 and is headquartered in Calgary, Canada.


QUESTAR CORPORATION (STR)

Questar Corporation and its subsidiaries operate as a natural gas-focused energy company. It operates through its three subsidiaries: Questar Market Resources, Inc.; Questar Pipeline Company; and Questar Gas Company. The Questar Market Resources engages in gas and oil exploration, development, and production; gas gathering and processing; wholesale gas and oil marketing; and gas storage. The Questar Pipeline provides interstate natural gas transmission, storage, and gas-processing and treating services. As of December 31, 2005, it owned and operated approximately 488-mile line that extended from the Blanco hub in the San Juan Basin to the California state line serving approximately 794,117 sales and transportation customers. The Questar Gas distributes natural gas as a public utility in Utah, southwestern Wyoming, and a small portion of southeastern Idaho. As of above date, the company had 1,434 billion cubic feet of proved natural gas reserves. It primarily operates in Rocky Mountain region of Wyoming, Utah, and Colorado; and the Midcontinent region of Oklahoma, Texas, and Louisiana. The company was founded in 1922 and is headquartered in Salt Lake City, Utah.


BLUE DOLPHIN ENERGY COMPANY (BDCO)

Blue Dolphin Energy Company, through its subsidiaries, engages in the gathering and transportation of natural gas and condensate, as well as in the development of oil and gas properties in the United States. The company operates in two segments, Pipeline Transportation Services, and Oil and Gas Exploration and Production. The Pipeline Transportation Services comprise offshore and onshore divisions. The offshore division transports gas and liquids and owns approximately 34 miles of 20-inch pipeline from a platform in Galveston Area Block 288 to shore. It also owns a platform and 5 field gathering lines totaling approximately 27 miles, connected to the main 20-inch line. An additional 4 miles of 20-inch pipeline onshore connects the offshore division to the shore facility at Freeport, Texas. The onshore division owns approximately 2 miles of 16-inch pipeline for transportation of gas from the shore facility to a sales point at Freeport, Texas. It also owns the Buccaneer Pipeline, an 8-inch liquids pipeline, which transports crude oil and condensate from the storage tanks to its barge-loading terminal on the Intracoastal Waterway near Freeport, Texas for sale to third parties. The Oil and Gas Exploration and Production segment engages in the exploration, acquisition, development, and operation of oil and gas properties in the western and central Gulf of Mexico. It holds a license to approximately 200 blocks of 3-D seismic data covering 1,152,000 acres in the western Gulf of Mexico and inventory of close grid 2-D seismic data. The company focuses primarily in the geographical areas of Texas and Louisiana Gulf Coast, and the Gulf of Mexico shelf. Blue Dolphin Energy was incorporated in 1986 and is based in Houston, Texas.


ROSETTA RESOURCES INC (ROSE)

Rosetta Resources, Inc., together with its subsidiaries, engages in the acquisition, exploration, development, and production of oil and natural gas properties in the United States. The company owns and operates properties located in the Sacramento Basin of California, south Texas, the State Waters of Texas, the Gulf of Mexico, and the Rocky Mountains. It has interests in Rio Vista Gas Field, and Sacramento Valley Extension project located in Sacramento Basin of California; the Lobo and Perdido Sand Trends located in south Texas; Vicksburg and Frio Trends in Galveston Bay, and Sabine lake located in State Waters of Texas; DJ and San Juan Basins in the Rocky Mountains; and in certain properties located in Mid-continent. As of December 31, 2006, the company had proved oil and natural gas reserves of approximately 407.8 billion cubic feet equivalent, which comprised 390.2 billion cubic feet of natural gas, and 2,930 thousand barrels of oil and condensate. Rosetta Resources, Inc. is headquartered in Houston, Texas.


QUICKSILVER RESOURCES INC (KWK)

Quicksilver Resources, Inc., an independent oil and gas company, engages in the exploration, acquisition, development, production, and sale of natural gas, crude oil, and natural gas liquids in the United States and Canada. It also involves in the marketing, processing, and transmission of natural gas. The company primarily develops and produces unconventional natural gas reserves, including coal bed methane, shale gas, and tight sands gas. Quicksilver has interests in Alberta Basin shallow gas sands in Alberta; New Albany Shale in Indiana/Kentucky; Antrim Shale, Prairie du Chien, Detroit River, Richfield, and Niagaran Reef properties in Michigan; Rocky Mountain properties in Montana and Wyoming; and other properties in Texas. As of December 31, 2004, Quicksilver Resources had estimated proved reserves of 968 billions of cubic feet of natural gas equivalent. It sells natural gas and crude oil to various customers, including utilities, oil and gas companies or their affiliates, industrial companies, trading and energy marketing companies, refineries, and other users of petroleum products. The company was founded in 1997 and is headquartered in Fort Worth, Texas.


DELTA PETROLEUM CORPORATION (DPTR)

Delta Petroleum Corporation, an independent energy company, engages in the acquisition, exploration, development, and production of oil and gas properties. Its oil and gas operations include production of oil and gas; drilling exploratory and development wells and related operations; and acquiring and selling oil and gas properties. The company's products include crude oil and natural gas. The principal markets for oil and gas are refineries and transmission companies. As of June 30, 2005, the company owned producing and nonproducing oil and gas interests, undeveloped leasehold interests, and related assets in 15 states, as well as interests in a producing federal unit offshore California and undeveloped offshore federal leases near Santa Barbara, California. The company had proved reserves of 224.3 billion cubic feet of gas equivalent, as of the above date. Delta Petroleum was organized in 1984 and is based in Denver, Colorado.


CROSSTEX ENERGY L.P (XTEX)

Crosstex Energy, L.P. (partnership) engages in gathering, transmitting, treating, processing, and marketing natural gas along the Gulf Coast of the United States. The partnership connects the wells of natural gas producers in the geographic areas of its gathering systems in order to purchase the gas production; treats natural gas to remove impurities; processes natural gas for the removal of natural gas liquids; transports natural gas; and supplies natural gas to various markets. Crosstex also removes carbon dioxide and hydrogen sulfide from natural gas to meet pipeline quality specifications. In addition, it purchases natural gas from producers not connected to its gathering systems for resale and sells natural gas on behalf of producers. As of May 25, 2005, the partnership operated approximately 4,500 miles of pipeline, 5 processing plants, and 140 natural gas amine treating plants, and 23 dew point suppression plants. As of the above date, it provided services for approximately 1.9 billion cubic feet /day of natural gas. Crosstex Energy was founded in 1992 and is headquartered in Dallas, Texas.


BENTON OIL AND GAS COMPANY (HNR)

Harvest Natural Resources, Inc. engages in the acquisition, development, production, and disposition of oil and gas properties primarily in Venezuela. Its properties principally include South Monagas Unit, Uracoa field, Tucupita field, West Bombal Field. As of December 31, 2004, the company held estimated proved reserves of 84.4 million barrels of oil equivalent in the South Monagas Unit. Harvest Natural Resources was founded in 1988 and is headquartered in Houston, Texas.


DENBURY RESOURCES INC (HOLDING COMPANY) (DNR)

Denbury Resources, Inc. engages in the acquisition, development, operation, and exploration of oil and natural gas properties in the Gulf Coast region of the United States, primarily in Louisiana, Mississippi, and Texas. It owns interest in 29 oil and gas wells in the Fort Worth Basin in North Central Texas; 586 wells in the eastern part of the Mississippi salt basin; 84 wells in the land and marshes of south Louisiana; and 1 well in Offshore Gulf Coast. It also owns a carbon dioxide (CO2) tertiary flood in the western Mississippi, which it uses for injection in its tertiary oil recovery operations. As of December 31, 2004, it had 101,287(MBbls) of proved oil reserves and 168,484(MMcf) of proved natural gas reserves. The company was incorporated in 1951 and is headquartered in Plano, Texas.


APACHE CORPORATION (APA)

Apache Corporation engages in the exploration, development, and production of crude oil, natural gas, and natural gas liquids. In North America, its exploration and production interests are focused in the Gulf of Mexico, the Gulf Coast, the Permian Basin, the Anadarko Basin, and the western sedimentary basin of Canada. The company also has exploration and production interests offshore and onshore Egypt, offshore Western Australia, offshore the United Kingdom in the North Sea, offshore the People's Republic of China, and onshore Argentina. As of December 31, 2004, the company had total estimated proved reserves of 932 millions barrels of crude oil, condensate, and natural gas liquids; and 6.0 trillion cubic feet of natural gas. Apache Corporation was formed in 1954 and is based in Houston, Texas.


CNOOC LIMITED (CEO)

CNOOC Limited engages in the exploration, development, and production of crude oil and natural gas primarily in People's Republic of China. As of December 31, 2004, the company had estimated net proved reserves of 2,230.0 million barrels-of-oil equivalent, which consists of 1,455.6 million barrels of crude oil and condensate and 4,646.6 billion cubic feet of natural gas. The company was founded in 1982 and is based in Hong Kong.


ATP OIL & GAS CORPORATION (ATPG)

ATP Oil & Gas Corporation engages in the acquisition, development, and production of oil and natural gas properties in the Gulf of Mexico and the North Sea. The company had leasehold and other interests in 52 offshore blocks; 26 platforms; and 68 wells, including 5 subsea wells in the Gulf of Mexico, as well as in 10 blocks and 1 company-operated subsea well in the North Sea, as of December 31, 2004. It had leasehold interests in the Gulf of Mexico and the North Sea covering approximately 317,028 gross and 249,361 net acres, as of the above date. As of December 31, 2004, the company had estimated net proved reserves of 275.2 billion cubic feet equivalent, of which approximately 180.7 billion cubic feet equivalent was in the Gulf of Mexico and 94.5 billion cubic feet equivalent was in the North Sea. These reserves comprised of 205.2 billion cubic feet equivalent of natural gas and 11.7 million barrels of oil. ATP Oil & Gas was founded by T. Paul Bulmahn in 1991. The company is based in Houston, Texas.


PARALLEL PETROLEUM CORPORATION (PLLL)

Parallel Petroleum Corporation engages in the acquisition, development, and exploitation of oil and natural gas properties in Texas and New Mexico. The company produces and sells oil and natural gas. It has properties located in the Permian Basin of west Texas and New Mexico; Liberty County in east Texas; and in the onshore Gulf Coast area of south Texas. The company's properties in the Permian Basin of west Texas include Fullerton San Andres field located in Andrews County; Carm-Ann San Andres Field/N. Means Queen Unit, located in Andrews and Gaines Counties; and Diamond M Canyon Reef Unit in Scurry County. Its properties in onshore Gulf Coast area of south and north Texas comprise Yegua/Frio Gas project, located in Jackson and Wharton Counties; Cook Mountain Gas project, which is located in Liberty County; and Barnett Shale Gas project, located in Tarrant County. In addition, the company is evaluating, leasing, drilling, and preparing to drill new projects located in New Mexico, the Fort Worth Basin of Texas, the Cotton Valley Reef trend of east Texas, and the Uinta Basin of Utah. As of December 31, 2004, it had net proved reserves of approximately 18.9 million barrels of oil or other liquid hydrocarbons and 16.8 billion cubic feet of natural gas. Parallel Petroleum Corporation was founded in 1979 and is headquartered in Midland, Texas.


OCCIDENTAL PETROLEUM CORPORATION (OXY)

Occidental Petroleum Corporation primarily engages in the exploration for, development, production, and marketing of crude oil and natural gas in the United States, Latin America, and Middle East. As of December 31, 2004, the company had proved reserves of 2,489 million barrels of oil and gas equivalent. Occidental Petroleum also manufactures and markets basic chemicals, such as chlorine, caustic soda, potassium chemicals, and their derivatives; vinyls, including polyvinyl chloride (PVC), vinyl chloride monomer, and ethylene dichloride; and performance chemicals, including chlorinated isocyanurates, resorcinol, antimony oxide, mercaptans, and sodium silicates. PVC resins are used in piping, electrical insulation, external construction materials, flooring, medical and automotive products, and packaging. The company markets its chemical products to industrial users or distributors through its own sales force. Occidental Petroleum is headquartered in Los Angels, California.


COMSTOCK RESOURCES INC (CRK)

Comstock Resources, Inc. engages in the acquisition, development, production, and exploration of oil and natural gas primarily in the Gulf of Mexico, Texas, Louisiana, Oklahoma, Arkansas, and Kansas. As of December 31, 2004, the company had proved oil and natural gas reserves of 628.8 billion cubic feet of natural gas equivalent, and owned interests in 1,356 producing oil and natural gas wells. Comstock Resources is headquartered in Frisco, Texas.


TOREADOR RESOURCES CORPORATION (TRGL)

Toreador Resources Corporation engages in the exploration, development, production, leasing, and acquisition of oil and natural gas. The company holds rights to explore and develop oil and natural gas properties in the Paris Basin, France; onshore and offshore Turkey; onshore Romania and Hungary; and offshore Trinidad, West Indies. It also owns various working interest properties in Texas, Kansas, New Mexico, Louisiana and Oklahoma. As of December 31, 2004 the company had 8,884 MBbl of proved oil reserves and 4,875 MMcf of natural gas reserves. The company, formerly known as toreador Royalty Corporation, was incorporated in 1951 and is headquartered in Dallas, Texas.


VAALCO ENERGY INC (EGY)

VAALCO Energy, Inc. engages in the acquisition, exploration, development, and production of crude oil and natural gas. The company's properties and exploration activities are located in the Texas Gulf Coast region and offshore Gabon, West Africa. As of December 31, 2004, it had total proved reserves of 8.7 million barrels of crude oil and 54 million cubic feet of natural gas. The company is based in Houston, Texas.


TALISMAN ENERGY INC (TLM)

Talisman Energy, Inc. engages in the exploration, development, production, and transportation of crude oil, natural gas, and natural gas liquids principally in North America. The company focuses its activities on Greater Arch, deep basin, Alberta Foothills, Edson area, Monkman/BC Foothills, Lac La Biche, Ontario offshore, southern Alberta Foothills, Ontario onshore, Chauvin, Carlyle, Central Alberta, and Shaunavon in Canada; and deep horizontal Trenton-Black River formation gas wells in the Appalachia area in the United States. It also operates in North Sea; and southeast Asia, including Indonesia, Malaysia, and Vietnam. Talisman Energy has producing interests in Algeria and Trinidad, and exploration interests in Alaska, Colombia, Peru, Qatar, Falkland Islands, and Papua New Guinea. As of December 31, 2004, it had proved and probable net reserves of 838.1 million barrels of oil equivalent of oil and natural gas liquids, 6,016.4 billion cubic feet of natural gas, and 55.6 million barrels of synthetic oil. Talisman Energy was founded in 1925 and is headquartered in Calgary, Canada.


SUNCOR ENERGY INC (SU)

Suncor Energy, Inc. operates as an integrated energy company in Canada. The company produces light sweet and light sour crude oil, diesel fuel, and various custom blends from oil sands mined in the Athabasca region of northeastern Alberta and markets these products in Canada and the United States. Its other businesses include the exploration, acquisition, development, production, transportation, and marketing of natural gas, natural gas liquids, and crude oil in Canada and the United States; refining, transporting, and marketing petroleum and petrochemical products, such as gasoline, jet fuel, diesel, heating fuels, heavy fuel oils, and petrochemicals to industrial, commercial, wholesale, and refining customers in Ontario and Quebec, Canada, and in Colorado and Wyoming, the United States. As of December 31, 2004, the company operated 43 retail stations primarily in Denver. Suncor Energy is headquartered in Calgary, Canada.


CHESAPEAKE ENERGY CORPORATION (CHK)

Chesapeake Energy Corporation engages in the acquisition, development, exploration, production, and marketing of oil and natural gas in the United States. It primarily operates in the mid continent region of the United States, which includes Oklahoma, western Arkansas, southwestern Kansas, and the Texas Panhandle. The company also has operations in the Permian Basin of western Texas and eastern New Mexico, in the Ark-La-Tex basin of eastern Texas and northern Louisiana, and in the south Texas and Texas Gulf coast regions. As of December 31, 2004, the company'S estimated proved reserves were 4.9 trillion cubic feet of natural gas equivalent and owned interests in approximately 19,800 producing wells. The company was co-founded by Aubrey K. McClendon and Tom L. Ward in 1989. Chesapeake is headquartered in Oklahoma City, Oklahoma.


SWIFT ENERGY COMPANY (SFY)

Swift Energy Company engages in the exploration, development, acquisition, and operation of oil and natural gas properties. It primarily focuses on inland waters, and onshore oil and natural gas reserves in Louisiana and Texas, as well as on oil and natural gas reserves in New Zealand. Its properties include AWP Olmos, south Texas; Brookeland, east Texas; Lake Washington, south Louisiana; Masters Creek, central Louisiana; Rimu/Kauri, New Zealand; and TAWN, New Zealand. As of December 31, 2004, the company had estimated proved reserves of 799.8 billions cubic feet of natural gas equivalent, as well as 932 natural gas producing wells. The company was founded in 1979 and is headquartered in Houston, Texas.


ST. MARY LAND (SM)

St. Mary Land & Exploration Company engages in the exploration, exploitation, development, acquisition, and production of natural gas and crude oil in the continental United States. Its main regions include the mid-continent, the ArkLaTex, the Gulf Coast, the Rocky Mountain, and the Permian Basin. The mid-continent region includes its operations in the Anadarko and Arkoma Basins in Oklahoma and northern Texas. The ArkLaTex region includes properties in east Texas, northern Louisiana, southern Arkansas, and southern Mississippi. The Gulf Coast region includes properties in the Gulf of Mexico and onshore in south Louisiana and south Texas. The Rocky Mountain region includes the Williston Basin in eastern Montana and western North Dakota, the Powder River Basin in Montana and Wyoming, and the Greater Green River, Big Horn, and Wind River Basins in Wyoming. The Permian Basin region includes its properties in eastern New Mexico and western Texas. As of December 31, 2004, the company had estimated proved reserves of approximately 56.6 million barrels of oil and 319.2 billion cubic feet of natural gas. St. Mary Land & Exploration was founded in 1908 and is headquartered in Denver, Colorado.


CANADIAN NATURAL RESOURCES LIMITED (CNQ)

Canadian Natural Resources Limited engages in the acquisition, exploration, development, production, marketing, and sale of crude oil and natural gas. The company's principal regions of crude oil and natural gas operations are in the Western Canadian Sedimentary Basin, the United Kingdom sector of the North Sea; and Offshore west Africa. As of December 31, 2004, the company's oil and natural gas reserves include 1,066 MMbbls of crude oil and natural gas liquids and 2,690 Bcf of natural gas. The company was incorporated in 1973 as AEX Minerals Corporation and changed its name to Canadian Natural Resources Limited in 1975. Canadian Natural Resources is headquartered in Calgary, Canada.


NEWFIELD EXPLORATION COMPANY (NFX)

Newfield Exploration Company engages in the exploration, development, and acquisition of crude oil and natural gas properties. Its areas of operation include the Gulf of Mexico, the United States onshore Gulf Coast, the Anadarko and Arkoma Basins of the Mid-Continent, and the Uinta Basin of the Rocky Mountains, as well as offshore Malaysia, offshore Brazil, China's Bohai Bay, and the North Sea. As of December 31, 2004, the company had proved oil and gas reserves of 1.8 trillion cubic feet equivalent, of which 70% were located onshore in the United States, 28% were located in the Gulf of Mexico, and 2% were located internationally. As of the above date, Newfield Exploration owned interests in approximately 300 leases on the Shelf and 80 leases in deepwater, and approximately 330 gross wells in the Gulf of Mexico; approximately 277,000 gross acres and approximately 495 gross wells the onshore Gulf Coast; approximately 514,000 gross lease acres, 22,000 gross mineral acres, and 2,420 gross wells in the Mid Continent; and 110,000 gross acres, 568 gross producing wells, and 293 water injection wells in the Rocky Mountains. The company was founded in 1988 by Joe B. Foster and is headquartered in Houston, Texas.


EOG RESOURCES INC (EOG)

EOG Resources, Inc. operates as an independent oil and natural gas company in the United States. The company, together with its subsidiaries, engages in the exploration, development, production, and marketing of natural gas and crude oil primarily in the United States, Canada, offshore Trinidad, and the United Kingdom North Sea. As of December 31, 2004, the company's total estimated net proven reserves were 5,647 billion cubic feet equivalent of which natural gas reserves were 5,047 billion cubic feet; and crude oil, condensate, and natural gas liquids reserves were 100 million barrels. EOG Resources was organized in 1985. It was formerly known as Enron Oil & Gas Company and changed its name to EOG Resources, Inc. in 1999. EOG is headquartered in Houston, Texas.


GULFPORT ENERGY CORPORATION (GPOR)

Gulfport Energy Corporation engages in the exploration, development, and production of oil and gas in the Louisiana Gulf Coast. Its operations are concentrated in two fields, West Cote Blanche Bay and the Hackberry fields. The company also holds working interests and overriding royalty interest in Bayou Long, Bayou Penchant, Bayou Pigeon, Deer Island, Golden Meadow, and Napoleonville fields in Louisiana. As of December 31, 2006, its estimated proved reserves were 23.2 million barrels of oil equivalent, including 19,692 thousands of barrels of oil and 20,801 millions of cubic feet of gas. Gulfport Energy also had interest in 105 gross productive oil and gas wells. The company was founded in 1997 and is headquartered in Oklahoma City, Oklahoma.


PIONEER NATURAL RESOURCES COMPANY (PXD)

Pioneer Natural Resources Company operates as an oil and gas exploration, and production company. The company produces oil, natural gas liquids, and gas. Its properties primarily include Hugoton field located in southwest Kansas; West Panhandle field in the panhandle region of Texas; and Spraberry field located in west Texas. The company has operations principally in the United States, Argentina, Canada, Gabon, South Africa, and Tunisia. As of December 31, 2004, the company's proved reserves totaled 1.0 billion barrel of oil equivalent. Pioneer Natural Resources was formed through the merger of Parker & Parsley Petroleum Company and MESA, Inc. in 1997. The company is headquartered in Irving, Texas.


ULTRA PETROLEUM CORP (UPL)

Ultra Petroleum Corp. engages in the acquisition, exploration, development, and production of oil and gas properties in the Green River Basin of Southwest Wyoming and Bohai Bay, China. As of December 31, 2004, Ultra Petroleum owned interests in approximately 166,974 gross (92,997 net) acres in Wyoming, covering approximately 260 square miles; and 15,518 gross (14,652 net) acres in Pennsylvania. It also has working interests in approximately 241 gross productive wells in this area. In addition, the company has an interest in two oil exploration/development blocks in Bohai Bay, China. As of the above date, Ultra Petroleum had proved natural gas and oil reserves of 1,482,341 million cubic feet equivalent. The company was incorporated in 1979 and is headquartered in Houston, Texas.


BERRY PETROLEUM COMPANY (BRY)

Berry Petroleum Company engages in the production, development, acquisition, exploration, and exploitation of crude oil and gas in the United States. The company owns and operates working interests in 38 properties consisting of 4,528 acres located in the Midway-Sunset field; the McVan property, which consists of 560 acres in the Poso Creek field; 9 leases and 4 fee properties totaling approximately 965 acres in the Placerita field; and a 100% working interest in 6 leases totaling 8,563 acres in the Montalvo field in California. It also has interests in the Brundage Canyon leasehold in Duche sne County, Utah that consists of leases totaling approximately 47,300 gross acres; a 52% working interest in properties located in the Niobrara field in northeastern Colorado comprising approximately 127,000 gross acres; and working interests in approximately 390,000 gross prospective acres located in eastern Colorado, western Kansas, and southwestern Nebraska. In addition, the company holds a 15.83% nonoperated working interest in the South Joe Creek coalbed methane field, which represents interests in leases totaling 5,106 acres in the northeastern portion of the Powder River Basin in Wyoming; holds 163,000 net acres in eastern Kansas; and holds 55,000 net acres in central Illinois. As of December 31, 2004, Berry Petroleum had proved developed reserves of 78,207 Mbbls of oil and 20,048 Mmcf of gas. The company markets its crude oil to independent marketers and oil refining companies. Berry Petroleum was founded by Clarence J. Berry in 1909. The company is headquartered in Bakersfield, California.


EVOLUTION PETROLEUM CORPORATION INC (EPM)

Evolution Petroleum Corporation engages in the acquisition, exploitation, and development of properties for the production of crude oil and natural gas in Louisiana, the United States. It owns a 100% working interest in Tullos Field Area, which consists of approximately 156 producing wells located in the Tullos Urania, Colgrade, and Crossroads Fields in LaSalle and Winn Parishes, Louisiana. The company also has non-operated interests in the 13,636 acre Delhi Field, which consist of a 7.4% overriding and mineral royalty interest in the Delhi Holt Bryant Unit; a 25% reversionary working interest in the Delhi Holt Bryant Unit; and a 25% working interest in certain other depths in the Delhi Field. As of July 1, 2007, Evolution Petroleum had proved reserves of approximately 1,084,000 barrels of oil, and 3,838,000 thousand cubic feet of gas. The company is headquartered in Houston, Texas.


BARNWELL INDUSTRIES INC (BRN)

Barnwell Industries, Inc. and its subsidiaries engage in the exploration, development, production, and sale of oil and natural gas primarily in Canada. The company also drills wells and maintains water systems, as well as invests in leasehold land in Hawaii. The company's principal oil and natural gas property includes Dunvegan Unit located in Alberta. As of September 30, 2005, this property had 188 natural gas wells. It owned and operated four rotary drill rigs, and pump installation and service equipment, as well as leased one rotary drill/workover rig to an oil company, as of the above date. The company had 1,102,000 barrels of proved oil and 21,842,000 thousand cubic feet of proved natural gas reserves, as of above date. Barnwell Industries, Inc. was incorporated in 1956 and is based in Honolulu, Hawaii.


ENCORE ACQUISITION COMPANY (EAC)

Encore Acquisition Company engages in the acquisition, development, exploitation, exploration, and production of onshore North American oil and natural gas reserves. The company's oil and natural gas properties primarily concentrated in the Cedar Creek Anticline in the Williston Basin of Montana and North Dakota; the Permian Basin of west Texas and southeastern New Mexico; the MidContinent area, which includes the Arkoma and Anadarko Basins of Oklahoma, the ArkLaTx region of northern Louisiana and east Texas, and the Barnett Shale of north Texas; and the Rockies that comprises nonCCA assets in the Williston and Powder River Basins of Montana, as well as the Paradox Basin of southeastern Utah. As of December 31, 2004, its total proved oil and natural gas reserves were 173,053 thousand barrels of oil equivalent. Encore principally sells its products to end users, marketers, refiners, and other purchasers in the United States. The company was organized in 1998 and is based in Fort Worth, Texas.


ENERGY PARTNERS LTD (EPL)

Energy Partners, Ltd. engages in the oil and natural gas exploration and production focusing on the shallow to moderate depth waters of the Gulf of Mexico Shelf. The company had interests in 29 producing fields and 5 fields under development; and 1 field with drilling operations, as of December 31, 2004. It had proved reserves of approximately 149.8 billion cubic feet of natural gas and 53.7 million barrels of oil, as of the above date. Energy Partners was founded by Richard A. Bachmann in 1998. The company is based in New Orleans, Louisiana.


CIMAREX ENERGY CO (XEC)

Cimarex Energy Co. operates as an independent oil and gas exploration and production company in the United States. Its exploration and development activities are primarily focused in western Oklahoma and the upper Gulf Coast areas of Texas and south Louisiana. Cimarex has smaller projects in Kansas, the Hardeman Basin of north Texas; the Permian Basin of west Texas and southeast New Mexico; the Mississippi Salt Basin; and the northern San Joaquin Valley of California. In addition, Cimarex Energy markets third party gas incidental to the sale of its production. Through its subsidiary, Cimarex Energy Services, Inc., the company purchases and markets Cimarex's and third-party natural gas production for resale. In addition, it provides compression, gathering, and gas processing services in Oklahoma, Texas, and Kansas. As of December 31, 2004, the company's proved reserves were totaled 449.0 billion cubic feet equivalent consisting of 364.6 billion cubic feet of gas and 14.1 million barrels of oil. Cimarex was formed in 2002 and is headquartered in Denver, Colorado.


PRIMEENERGY CORPORATION (PNRG)

PrimeEnergy Corporation engages in the development, exploration, acquisition, and production of oil and natural gas properties. The company owns leasehold, mineral, and royalty interests in producing and nonproducing oil and gas properties throughout the United States, primarily in Colorado, Kansas, Louisiana, Mississippi, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, Texas, Utah, West Virginia, and Wyoming, as well as in the Gulf of Mexico. In addition, it provides well-servicing support operations, site-preparation, and construction services for oil and gas drilling and reworking operations. As of December 31, 2004, PrimeEnergy operated 1,533 wells and owned nonoperating interests in approximately 770 wells. Its offshore properties had net proved reserves of 10.2 billion cubic feet equivalent of gas, as of the above date. The company was organized in 1973 and is based in Stamford, Connecticut.


GMX RESOURCES INC (GMXR)

GMX Resources, Inc. engages in the acquisition, exploration, and development of properties for the production of crude oil and natural gas in Oklahoma, Louisiana, New Mexico, and Texas. Its properties include The Sabine Uplift in east Texas and Louisiana, and The Tatum Basin in southeast New Mexico. As of December 31, 2003, GMX had 41.7 net producing wells, and proved reserves of 45,029 million cubic feet of gas and 1,323 thousand barrels of oil. The company was organized in 1998 and is headquartered in Oklahoma City, Oklahoma.


FOREST OIL CORPORATION (FST)

Forest Oil Corporation engages in the acquisition, exploration, development, and production of natural gas and liquids principally in North America. As of December 31, 2004, it had total proved reserves of 1,334,003 million cubic feet equivalent of natural gas and liquids. The company also held interests in approximately 3,600 net oil and gas wells in the United States and Canada, as of the above date. Forest Oil Corporation was founded in 1916 and is headquartered in Denver, Colorado.


TRANSGLOBE ENERGY CORP (TGA)

TransGlobe Energy Corporation, through its wholly owned subsidiaries, engages in the exploration, development, and production of crude oil, natural gas liquids, and natural gas. The company has exploration and production operations in Canada and in the Republic of Yemen, and an exploration project in the Arab Republic of Egypt. It has interests in three production sharing agreements in the Republic of Yemen that include Block 32 area covering 591 square kilometers; Block S-1 covering 1,152 square kilometers; and Block 72 that encompasses 1,822 square kilometers. The company also has interests in Nuqra Block 1 property in the Arab Republic of Egypt, as well as has operations in Canada. The company was founded as Dusty Mac Mines, Ltd. in 1968 and changed its name to TransGlobe Energy Corporation in 1996. TransGlobe Energy is headquartered in Calgary, Canada.


ANADARKO PETROLEUM CORPORATION (APC)

Anadarko Petroleum Corporation primarily engages in the exploration, development, production, and marketing of natural gas, crude oil, condensate, and natural gas liquids (NGLs). The company's principal areas of operations are located in the United States, primarily in Texas, Louisiana, the mid-continent region and the western states, Alaska, and in the deep waters of the Gulf of Mexico, as well as in Canada, Algeria, Venezuela, and Qatar. As of December 31, 2004, Anadarko had proved reserves of 7.5 trillion cubic feet of natural gas and 1.1 billion barrels of crude oil, condensate, and NGLs. The company also owns and operates six gas gathering systems in its primary producing areas and purchases natural gas, crude oil, and NGLs volumes for resale. In addition, it engages in the hard minerals business through nonoperated joint ventures and royalty arrangements in various coal, trona (natural soda ash), and industrial mineral mines located on lands within and adjacent to its Land Grant holdings. The company also has exploration acreage in Tunisia, west Africa, Indonesia, off the coast of Georgia in the Black Sea, and other selected areas. Anadarko was established in 1959 and is headquartered in The Woodlands, Texas.


PENN WEST ENERGY TRUST (PWE)

Penn West Energy Trust operates as an open-ended, unincorporated investment trust in Canada. The trust, through its subsidiaries, engages in acquiring, developing, exploiting, and holding interests in petroleum and natural gas properties and assets. Its oil and gas properties are located in the western Canadian Sedimentary Basin and within the provinces of British Columbia, Alberta, Saskatchewan, and Manitoba. As of December 31, 2006, it had proved plus probable gross reserves of 482,560 million barrels of oil equivalent; and had working interests in 20,480 oil and gas wells. Penn West Energy Trust was founded in 1979 and is headquartered in Calgary, Canada.


CANARGO ENERGY CORPORATION (CNR)

CanArgo Energy Corporation engages in the acquisition, exploration, development, production, and marketing of crude oil and natural gas primarily in Republic of Georgia. The company has exploration and development activities in Ninotsminda Field and Samgori Field in Georgia. As of December 31, 2004, it had proved developed and undeveloped reserves of 6.271 million barrels of oil and 2.62 billion cubic feet of natural gas. CanArgo Energy Corporation is headquartered in St Peter Port, Guernsey.


STONE ENERGY CORPORATION (SGY)

Stone Energy Corporation engages in the acquisition, exploration, development, operation, and production of oil and gas in the Gulf of Mexico (GOM), various basins of the Rocky Mountains, and Williston basin oil of North Dakota and Montana. It also owns properties in Howard Ranch Field in the northern Wind River Basin of Wyoming and approximately 47,000 net acres of deep rights below the Monument Butte Field in the Uinta Basin of Utah. The company's property base consists of 79 active properties, 58 in the Gulf Coast Basin and 21 in the Rocky Mountains, and 58 primary term leases in GOM. As of December 31, 2004, it had estimated proved reserves of approximately 825 billion cubic feet of gas equivalent. The company is headquartered in Lafayette, Louisiana.


ENDEAVOR INTERNATIONAL CORPORATION (END)

Endeavour International Corporation engages in the acquisition, exploration, and development of energy reserves in North Sea. The company produces hydrocarbons from the North Sea. It develops energy reserves in North Sea sectors of the United Kingdom and Norway. Endeavor International Corporation also holds interest in Phu Horm Gas Field Project located in Thailand. The company was formed in 2000. It was previously known as Expressions Graphics, Inc. and changed its name to Continental Southern Resources, Inc. The company further changed its name to Endeavor International Corporation in 2004. Endeavor International Corporation is headquartered in Houston, Texas.


CALLON PETROLEUM COMPANY (CPE)

Callon Petroleum Company engages in the exploration, development, acquisition, and production of oil and gas properties. Its properties are primarily located offshore in the Gulf of Mexico and onshore in Louisiana and Alabama. As of December 31, 2004, the company owned working interests in a total of 72 blocks/leases covering 145,000 net acres and had estimated net proved reserves of 191 billion cubic feet of natural gas equivalent. Callon Petroleum was founded in 1950 and is headquartered in Natchez, Mississippi.


CLAYTON WILLIAMS ENERGY INC (CWEI)

Clayton Williams Energy, Inc. engages in the exploration, development, acquisition, and production of oil and natural gas in the United States. It has interests primarily in the Permian Basin, Louisiana; Black Warrior Basin in Mississippi; and the Austin Chalk and Cotton Valley Reef of Texas. As of December 31, 2004, the company's total estimated proved reserves were 138.3 billion cubic feet of natural gas; and 26.8 million barrels of oil and natural gas liquids. As of the above date, Clayton had interests in 886.9 net oil and gas wells, and owned leasehold interests in approximately 388,000 net undeveloped acres. In addition, it operates natural gas service facilities, which comprise pipelines, treating plants, dehydration facility, and compressor stations. The company principally operates in Texas, Louisiana, New Mexico, and Mississippi. Clayton was incorporated in 1991 and is headquartered in Midland, Texas.


MAGELLAN PETROLEUM CORPORATION (MPET)

Magellan Petroleum Corporation engages in the exploration, development, production, and sale of oil and gas reserves. The company, through its subsidiary, Magellan Petroleum Australia Limited, owns interest in various properties, including Mereenie Oil and Gas Field, Palm Valley Gas Field, Nockatunga Oil Fields, Dingo Gas Field, Browse Basin, Maryborough Basin, and Cooper/Eromanga Basin in Australia. It also holds interest in various oil and gas properties in New Zealand and the United Kingdom. In addition, the company has a 2.67% direct interest in the Kotaneelee gas field in the Yukon Territory of Canada. Magellan Petroleum Corporation was incorporated in 1957 and is based in Hartford, Connecticut.


MERIDIAN RESOURCE CORPORATION (TMR)

The Meridian Resource Corporation engages in the exploration for, acquisition, development, and production of oil and natural gas reserves. It principally operates on the onshore oil and gas regions in south Louisiana, the Texas Gulf Coast, and offshore in the Gulf of Mexico. As of December 31, 2004, the company had approximately 139 billion cubic feet of natural gas equivalent proved reserves. It had interests in leases and options to lease acreage in approximately 300,000 gross acres. As of the above date, the company had interest in 35 oil wells and 68 natural gas wells. Meridian Resource was initially organized in 1985 as a master limited partnership and was converted into a Texas corporation in 1990. The company is headquartered in Houston, Texas.


ROYALE ENERGY INC (ROYL)

Royale Energy, Inc. operates as an independent oil and natural gas producer in the United States. It primarily engages in the production and sale of natural gas, acquisition of oil and gas lease interests and proved reserves, and drilling of both exploratory and development wells. The company owns wells and leases located principally in the Sacramento Basin and San Joaquin Basin in California, as well as in Utah, Texas and Louisiana. As of December 31, 2004, Royale Energy operated 68 wells in northern and central California; and owned working interests in 2 producing wells in offshore Louisiana and 12 producing wells in Texas, as well as held a minority interest in 1 producing gas well in Oklahoma. As of December 31, 2004, the company had proved developed reserves of approximately 8,135 million cubic feet of natural gas and 146 thousand barrels of oil reserves in northern and central California. Royale Energy was incorporated in 1986 and is based in San Diego, California.


MEXCO ENERGY CORPORATION (MXC)

Mexco Energy Corporation, an independent oil and gas company, engages in the acquisition, exploration, and development of oil and gas properties in the United States. As of December 31, 2004, the company owned and operated 17 producing wells and 2 shut-in wells, as well as had partial interests in an additional 1,982 producing wells located in the states of Texas, New Mexico, Oklahoma, Louisiana, Arkansas, Wyoming, Kansas, Colorado, Montana, and North Dakota. As of March 31, 2005, its total estimated proved reserves were approximately 7.328 Bcf of natural gas and 151,000 barrels of oil and natural gas liquids. The company was founded as Miller Oil Company in 1972 and changed its name to Mexco Energy Corporation in 1980. Mexco Energy is based in Midland, Texas.


BRIGHAM EXPLORATION COMPANY (BEXP)

Brigham Exploration Company engages in the exploration and development of onshore domestic oil and natural gas properties using 3-D seismic imaging and other technologies. The company's exploration and production activities are focused primarily in the onshore Texas Gulf Coast, the Anadarko Basin of northwest Oklahoma and the Texas Panhandle, and west Texas. Brigham Exploration also operates gas gathering systems. It sells its oil and natural gas to intrastate pipeline purchasers, operators of processing plants, and marketing companies. Brigham Exploration was founded in 1990 and is headquartered in Austin, Texas.


MCMORAN EXPLORATION COMPANY (MMR)

McMoRan Exploration Co. engages in the exploration, development, and production of oil and gas offshore in the Gulf of Mexico and in the Gulf Coast region. As of December 31, 2004, it owned or controlled interests in 98 oil and gas leases in the Gulf of Mexico, and onshore Louisiana and Texas covering approximately 252,000 gross acres. The company also owns 100% of the oil operations at Main Pass Block 299, through a joint venture with K-Mc Ventures I, L.L.C. It is also developing the Main Pass Energy Hub project, which includes the conversion of its former Main Pass sulphur facilities into a hub for the receipt and processing of liquefied natural gas, and the storage and distribution of natural gas. As of December 31, 2004, it had proved developed and undeveloped gas reserves of 14,765 million cubic feet (MMcf) and 6,422 MMcf respectively; and proved developed and undeveloped oil reserves of 4,640,475 barrels and 148,660 barrels respectively. The company was founded in 1994 and is headquartered in New Orleans, Louisiana.


GEORESOURCES INC (GEOI)

GeoResources, Inc. engages in the exploration, development, and production of oil and gas in North Dakota and Montana. The company, through its subsidiary, Western Star Drilling Company, provides rig, equipment, and personnel on a contract basis. It also operates leonardite mine (oxidized lignite coal) and a processing plant in Williston, which manufactures leonardite based products used primarily as drilling mud additives in oil and gas drilling companies, metal working foundries, and agricultural applications. As of December 31, 2004, the company had proved developed reserves of 1,652,000 barrels of oil and 391,000 mcf of gas. As of the above date, it developed oil and gas leases covering approximately 15,984 net acres in Montana and North Dakota; and owned 15 unpatented mining claims and 7 patented mining claims in Arizona. The company was incorporated in 1958 and is based in Williston, North Dakota.


ABRAXAS PETROLEUM CORPORATION (ABP)

Abraxas Petroleum Corporation, an independent energy company, engages in the acquisition, development, and production of crude oil and natural gas. It primarily operates in the Texas Gulf Coast, the Permian Basin of western Texas, and Wyoming. The company operates in the Portilla field in San Patricio County, the Wilcox in Goliad County; and the Edwards trend in DeWitt and Live Oak Counties in south Texas; and the Delaware Basin in Ward, Reeves, and Pecos Counties, the Eastern Shelf in Scurry, Mitchell, and Coke Counties; and the Midland Basin in Howard, Martin, and Dawson Counties in the Permian Basin of west Texas. Abraxas has interests in the Powder River Basin in Converse and Niobrara Counties in Wyoming. As of January 1, 2005, it had 3,101 thousand barrels of total proved crude oil reserves and 75,118 million cubic feet of natural gas proved reserves. The company was established in 1977 and is based in San Antonio, Texas.


EDGE PETROLEUM CORPORATION (EPEX)

Edge Petroleum Corporation, an oil and natural gas company, engages in the exploration, development, acquisition, and production of crude oil and natural gas properties in the United States. It has interests in approximately 30,196 net acres in south and south-central Texas, 1,161 net acres in south Louisiana, 4,426 net acres in Mississippi, and 658 net acres in Michigan, as well as 19,472 net acres in southeastern New Mexico. As of December 31, 2004, the company had 89.1 billion cubic feet of net proved reserves that comprised 66.3 billion cubic feet of natural gas, 1.8 million barrels of natural gas liquids, and 2.0 million barrels of crude oil and condensate. Edge Petroleum was founded in 1983 and is based in Houston, Texas.


CREDO PETROLEUM CORPORATION (CRED)

CREDO Petroleum Corporation engages in the acquisition, exploration, development, and production of oil and gas in the Mid-Continent and Rocky Mountain regions of the United States. It focuses on two core projects, natural gas drilling in the Northern Anadarko Basin of Oklahoma; and recovering standard gas from low-pressure reservoirs using its Calliope Gas Recovery System. The company's developed acreage was approximately 25,200 net and 142,800 gross acres, as of October 31, 2004. Its estimated proved oil and gas reverses were approximately 407,000 barrels of oil and approximately 15,273,000 mcf of gas, as of the above date. CREDO Petroleum Corporation owns working and royalty interests in approximately 128 wells, which are operated by outside parties. It owns working interests in approximately 69.53 net wells consisting of 16.23 net oil wells and 53.30 net gas wells. In addition, the company owns royalty and production payment interests in approximately 977 wells, primarily coal bed methane located in Wyoming. The company sells its oil production to crude oil purchasing companies. CREDO Petroleum Corporation was incorporated in 1978 and is headquartered in Denver, Colorado.


GASCO ENERGY INC (GSX)

Gasco Energy, Inc. engages in the exploration, development, acquisition, and production of crude oil and natural gas reserves in the western United States. It acquires leasehold interests in petroleum and natural gas rights, either directly or indirectly, as well as exploits and develops properties subject to these leases. The company focuses on the Uinta Basin in Utah and controls acreage in the Greater Green River Basin of Wyoming. As of December 31, 2004, Gasco Energy's proved reserves were 39,700,156 Mcf of gas and 274,074 Bbl of oil. As of the above date, it held an interest in 21 gross producing gas wells and 3 gross shut-in gas wells. The primary markets for the company's commodities are natural gas transmission pipeline companies, utilities, refining companies, and private industry end-users. Gasco Energy is based in Englewood, Colorado.


FIELDPOINT PETROLEUM CORPORATION (FPP)

Fieldpoint Petroleum Corporation engages in the acquisition, operation, and development of oil and natural gas properties in Louisiana, New Mexico, Oklahoma, Texas, and Wyoming. It holds interests in North Bilbrey field located outside of Hobbs, New Mexico; Longwood field located north of Greenwood, Louisiana; Lusk field located outside of Hobbs, New Mexico; Loving North Morrow field located two miles west of Loving, New Mexico and 12 miles south east of Carlsbad, New Mexico; and Chickasha field located approximately 65 miles southwest of Oklahoma city, Oklahoma. The company also owns interests in Hutt Wilcox field located approximately 60 miles south of San Antonio, Texas; West Allen field located approximately 100 miles south of Oklahoma City, Oklahoma; Giddings field located in various counties surrounding the city of Giddings, Texas; Big Muddy field located approximately 30 miles south of Casper, Wyoming; Whisler field located approximately 15 miles north east of Gillette, Wyoming; and Serbin field located approximately 50 miles east of Austin and 100 miles west of Houston. As of December 31, 2006, Fieldpoint had proved developed reserves of 637,652 barrels of oil and 1,761,909 mcf of gas; and 2,733 net acres of developed and 3,481 net acres of undeveloped oil and gas leases. It had varying ownership interest in 346 gross productive wells (92.16 net). The company is based in Cedar Park, Texas.