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COMPANY T
T-3 Energy Services was acquired by Robbins & Myers
TAC Energy - Leading international petroleum marketing and distribution company with annual volumes exceeding 2 billion gallons
TAG Oil [TSX:TAG] - Taranaki and Canterbury Basins of New Zealand
TAQA (Abu Dhabi National Energy Company) [Abu Dhabi:TAQA] - Interests in power generation, combined heat and water, desalination, upstream oil and gas, pipelines, services and structured finance.
TBX Resources [Pinksheets:TBXC] - Main areas of operations are located in Western Oklahoma and the Texas Panhandle in the Anadarko Basin.
TC Pipelines LP [NASDAQ:TCLP] - Formed by TransCanada PipeLines Limited to acquire, own and actively participate in the management of United States based natural gas pipelines and related assets
TECO Coal [subsidiary of TECO Energy] - Kentucky coal
TETRA Technologies [NYSE:TTI] - Diversified oil and gas services company that provides niche products and services focused on well completion and on late-life production enhancement and decommissioning
TG World Energy Corp. [TSX-V:TGE] - Alaska and Niger.
TGC Industries [AMEX:TGE] - Oil and Gas Services Corporation comprised of two companies; Tidelands Geophysical and Exploration Surveys.
TN-BP - Leading Russian oil company and is among the top ten privately-owned oil companies in the world in terms of crude oil production.
TOA Oil - [TOKYO:5008] - Member of the Showa Shell Group, whose primary business is oil refining
TX Holdings [OTCBB:TXHG] - Low risk oil and gas leases in the Abilene area of West Texas. TX
Talisman Energy [NYSE:TLM] - North America, the North Sea, Southeast Asia and Algeria.
Tamarack Valley Energy [TSX-V:TVE] - western Canadian sedimentary basin.
Tanganyika Oil was acquired by SINOPEC
Tangiers Petroleum [ASX:TPT] - Morocco
Tango Energy is now Tamarack Valley Energy
Tap Oil [ASX:TAP] - Interests on the North West Shelf of offshore Western Australia and New Zealand
Targa Resources Partners LP [NYSE:NGLS] - Russia and Kazakhstan
Target Energy - Drilling services
Tartan Energy was acquired by Nations Energy Company [private]
Taylor Hill Exploration [private] - Oil and gas company with a large inventory of prospective acreage on which the company has drillable prospects
Tatneft [RTS:TATN] - Russian oil producer
Tauber Oil [private] - Independent marketer of petroleum and petrochemical products
Taylor Hill Exploration Ltd. [private] - Alberta-based oil and gas exploration company with a large inventory of available oil and gas prospects where the company owns the leases.
Team [NASDAQ:TISI] - Onstream leak repairs and hot tapping company
Technicoil [TSX:YEC] - Provides both primary well drilling and secondary well stimulation services to the oil and gas production industry.
Technip [NYSE Euronext:TEC] - ranks among the biggest full-service engineering and construction groups in the field of hydrocarbons and petrochemicals.
Tecpetrol - Argentine oil and gas exploration and production company, with operations in Argentina, Venezuela, Ecuador, Bolivia, Peru and Mexico.
Teikoku Oil is now INPEX
Tempest Energy was acquired by Daylight Resources Trust
Tenaris [NYSE:TS] - Leading global manufacturer and supplier of tubular products
Tengasco [AMEX:TGC] - Leasing, exploration, drilling, development, and transportation of hydrocarbons, with operations in Tennessee and Kansas
Teppco Partners, L.P. was acquired by Enterprise Products Partners L.P.
Terra Energy [TSX:TT] - Alberta and British Columbia
Terra Grain Fuels - Constructing an ethanol plant near Belle Plaine, Saskatchewan
Terraquest Energy became Masters Energy, which was acquired by Zargon Energy Trust
Tesco [NASDAQ:TESO] - Design, manufacture and service of technology-based solutions for the upstream energy industry.
Tesla Exploration [TSX:TXL] - Offer a complete range of seismic acquisition services to the oil and gas exploration industry.
Tesoro Petroleum [NYSE:TSO] - Refiner and marketer of petroleum products.
Teton Energy Corporation is now Caerus Oil and Gas
Tetra Technologies [NYSE:TTI] - Oil and gas services company.
Texalta Petroleum was acquired by PetroFrontier
Texon Petroleum [ASX:TXN] - Gulf Coast of Texas, USA.
Thaioil [Bangkok:TOP] - Leading independent petroleum refiner and supplier of refined petroleum products in Thailand.
Thelon Capital [TSX-V:THC] - Jellico Coal Project, Tennessee.
Thunder Energy merged with Mustang Resources and Forte Resources to form Thunder Energy Trust, which is now Sword Energy
Thunder Energy Trust is now Sword Energy
Thunderbird Energy [TSX-V:TBD] - Wyoming, Kansas and Utah
Tiaro Coal [ASX:TCM] - Tiaro Coal project, Queensland
Tidewater [NYSE:TDW] - Offshore marine service industry
Tipperary Corporation was acquired by Santos
Titan Energy [ASX:TTE] - Developing Coal Seam Gas (CSG) interests in Western Australia and its oil and gas prospects in offshore Western Australia. (was Westralian Gas and Power )
Titan Energy Services [ASX:TTN] - Energy services to the Coal Seam Gas industry
Todco was acquired by Hercules Offshore
Todd Energy [private] - Energy exploration, production and delivery
Tom Brown was acquired by Encana
Tomahawk Energy is now K2 Energy
Torch Energy [NYSE:TRU] - Provides strategic services to the upstream energy industry
Toreador Resources [NASDAQ:TRGL] - Holds interests in developed and undeveloped oil and gas properties in France, Romania, Turkey and Trinidad. In the United States.
Torquay Oil [TSX-V:TOC-A] -  Oil and gas exploration, development and production in the Western Canadian Sedimentary Basin, SE Saskatchewan and SW Manitoba.
Torque Energy [TSX-V:TQE] - Ontario and Western Canada
Torrens Energy [ASX:TEY] - Geothermal
Total [NYSE:TOT] - Multinational energy company with employees and operations in more than 130 countries
Total Energy Services [TSX:TOT] - Oil and gas services
Touchstone Exploration [TSX-V:TAB] - Trinidad
Tower Resources [TSX-V:TWR] - Oil and gas in southern Alberta
Tower Resources plc [LSE:TRP] - Independent oil and gas exploration company with a regional focus on sub-Saharan Africa.
Trafina Energy [TSX-V:TFAa] - Natural gas: Areas of interest include Wetaskiwin, Jenner, Carson Creek, Bindloss and Judy Creek of Alberta.
TransAct Energy [OTCBB:TEGY] - Focus on renewable energies using Geothermal, Solar and Wind
TransAmerican Energy [TSX-V:TAE] - Alberta and Quebec (Canada) Texas and Oklahoma (USA)
TransAtlantic Petroleum [TSX:TNP] - Principal assets are located in the United States and in Nigeria
Transerv [ASX:TSV] - Warro Gas Project
Transeuro Energy [TSX-V:TSU] - Papau New Guinea, Armenia, and Ukraine.
TransGlobe Energy [AMEX:TGA] - Production Sharing Agreements in the Republic of Yemen
TransMontaigne Partners [AMEX:TLP] - terminaling and transportation company with operations along the Gulf Coast, in the Midwest, in Brownsville, Texas, along the Mississippi and Ohio Rivers, and in the Southeastern United States.
Transocean [NYSE:RIG] - world's largest offshore drilling company
Transportadora de Gas S.A [NYSE:TGS] - Main gas transportation company in Argentina
Trap Oil Group [LSE:TRAP] - geographic focus on the UK Continental Shelf
Traverse Energy [TSX-V:TVL] - Exploration, development and production of petroleum and natural gas in Alberta, Canada.
Treaty Energy [OTCBB:TECO] -
Trek Resources [Pinksheets:TRKX] - Oil and natural gas properties in conventional producing areas of the United States
Tri-Valley Corporation [AMEX:TIV] - Oil and gas exploration and production company, concentrating their efforts in the Northern Sacramento Valley natural gas province and then expanded into the Southern San Joaquin Valley oil province
Triangle Energy [ASX:TEG] - production of oil and gas in Indonesia
Triangle Petroleum [TSX-V:TPO] - North Dakota Bakken Shale oil play and the Maritimes Basin of Nova Scotia.
Trican Well Services [TSX:TCW] - Oil and gas services
Trilogy Energy Trust [TSX:TET] - Kaybob and Marten Creek areas of central Alberta.
Trinidad Drilling [TSX:TDG] - Drilling and well servicing sectors of the Canadian oil and gas industry
Trioil merged into Yangarra Resources
TriStar Oil & Gas has ben acquired by PetroBakken Energy
Triton Energy is now Waldron Energy
Trivello Energy is now Equitas Resources (mining)
True Energy Trust is now Bellatrix Exploration
True Oil [private] - Wyoming, Colorado, Montana, North Dakota, Utah, Texas, Louisiana, Mississippi, New Mexico, Missouri, Oklahoma and Arizona.
Truestar Petroleum [TSX-V:TPCh] - Newark East Gas Field, Barnett Shale (Texas)
Tullow Oil plc [LSE:TLW] - international Oil and Gas Exploration, Development and Production company focusing on Africa, Offshore UK and South Asia, with over 90 licences in 16 countries.
Turkish Petroleum Company - carrying out its petroleum activities in Turkey and abroad
Tuscany Energy [TSX-V:TUS] - Alberta and Western Saskatchewan
Tuscany International Drilling [TSX:TID] - Canadian-based oilfield services company; offering drilling, completion, workover, and equipment rental services to the oil and natural gas industry, initially in South America.
Tusk Energy was acquired by Polar Star Canadian Oil and Gas
Twin Butte Energy [TSX:TBE] - South East and West Central areas of Alberta
Twister BV - Innovative technologies and services for the gas processing industry
Twoco Petroleums [TSX-V:TWO] - Alberta
Tyner Resources [TSX-V:TIPh] - Czech Republic nd North America

COMPANY U
UK Coal [LSE:UKC] - Britain's biggest producer of coal and a company with substantial land and property interests
U.S. Geothermal [AMEX:HTM] [TSX:GTH] - Idaho geothermal reservior.
US Natural Gas Corp [OTCBB:UNGS] - Operations are concentrated in the Appalachian Basin within the states of Kentucky and West Virginia.
UTC Fuel Cells [United Technology company] - Partnering with major automobile manufacturers include Nissan, Hyundai and BMW, as well as the U.S. Department of Energy, in developing fuel cell technology for cars.
UTS Energy was acquired by Total E&P Canada, a wholly owned subsidiary of Total SA
Ultra Petroleum Corp [AMEX:UPL] - Properties in the Green River Basin of southwestern Wyoming and the shallow waters of Bohai Bay, China.
Ultrapar SA [NYSE:UGP] - Manages three businesses:
Ultragaz, a liquefied petroleum gas (LPG) distribution company
Oxiteno, a chemical and petrochemical company
Ultracargo, a petrochemical and gas storage and transportation company.
Ultima Energy Trust was acquired by Petrofund Energy Trust, which was acquired by Penn West Energy Trust
Union Drilling [UDRL] - Provides contract land drilling services and equipment to oil and gas companies in the United States.
Unipetrol - Czech
Unit Corporation [NYSE:UNT] - Diversified energy company, oil and natural gas in the Mid-Continent region.
Unitech Energy Resources [TSX-V:URX] - LeadScan software and database
United Heritage Corporation is now Glen Rose Petroleum
United Orogen Limited [ASX:UOG] -
United Refining - Regional refiner and marketer of petroleum products
Uniterre Resources is now Nai KUn Wind Energy
Universal Coal [ASX:UNV] - Thermal coal production and development company with assets in South Africa
Universal Compression is part of Exterran
Universal Wing Technologies [TSX-V:UAV] - Aerial Surveys
Unocal was acquired by Chevron
Upton Resources was acquired by StarPoint Energy, then Canetic Resources Trust, now Penn West Energy Trust


COMPANY V
VAALCO Energy, Inc. [AMEX:EGY] - Texas Gulf Coast and Gabon..
VSUS Technologies [Pinksheets:VSUT] - Coal in Colombia
Valero LP is now NuStar Energy
Valero Energy [NYSE:VLO - Extensive refining system and markets products branded as Valero, Diamond Shamrock, Ultramar, Beacon and Total.
Valiant Energy was acquired by Peerless Energy, which was acquired by Petrobank Energy and Resources Ltd.
Valkyries Petroleum is now part of Lundin Petroleum
Vallourec [Paris:VLLP] - Seamless steel tubes for oil industry
Vanco Energy [private] - A cquired licenses offshore eight African countries
Vangold Resources [TSX-V:VAN] - Revenue generating oil and gas projects in Canada and the United States.
Vanguard Natural Resources [NYSE:VNR] - properties are located in the southern portion of the Appalachian Basin in Kentucky and Tennessee, the Permian Basin in West Texas and New Mexico, in South Texas, and in Mississippi.
Vaquero Energy - Bakersfield, California
Valeura Energy [TSX-V:VLE] - Exploration, development and production of petroleum and natural gas in Western Canada and Turkey.
Varco is now National Oilwell Varco
Vast Exploration [TSX-V:VST] - Projects in Alberta and Saskatchewan.
Vault Energy Trust was acquired by Penn West Energy Trust
Vecta Energy [TSX-V:VER] - Western Canada
Venoco [private] - California-based oil and gas firm
Veraz Petroleum [TSX-V:VRZ] - Operations in Peru
Vermilion Energy Trust [TSX:VEYu] - Canadian based international energy trust
Vero Energy [TSX:VRO] - Liquids rich gas and light oil in properties in west central Alberta
Vestas Wind Systems [Copenhagen:VWS] - Development, manufacture, sale, marketing and maintenance of wind power systems
Victoria Oil and Gas plc [LSE:VOG] - Principal assets are 57% of the Logbaba gas and condensate field in Cameroon and 100% of the West Medvezhye oil and gas project in Siberia, Russia
Victoria Petroleum NL is now Senex Energy
Victory Energy Corporation [Pinksheets:VYEY] - Acquisition and development of oil and gas properties in the United States and Canada, with a current focus on Montana
Vintage Petroleum was acquired by Occidental Petroleum
Viper Resources [OTCBB:VPRS] - Oil sands
Viracocha Energy was acquired by Provident Energy Trust
Voith Hydro [JV between Voith and Seimens] -
Voith Hydro Wavegen Limited [a wholly owned subsidiary of Voith Hydro - World leader in wave energy and wave power. We developed and operate Limpet, the first commercial-scale wave energy device that generates wave energy for the grid.
Voyager Oil & Gas [AMEX:VOG] - Our business is focused on properties in Montana and North Dakota, and has expanded to target properties in Northeastern Colorado and Southeastern Wyoming.

COMPANY W
W&T Offshore [NYSE:WTI] - Independent oil and natural gas acquisition, exploitation and exploration company, with a focus primarily in the Gulf of Mexico
W-H Energy Services was acquired by Smith International, which was acquired by Schlumberger
WHL Energy [ASX:WHN] - Focused on developing and commercializing energy assets including wind energy, solar, biomass and clean fossil fuels.
WSP Holdings [NYSE:WH] - Leading manufacturer of Oil Country Tubular Goods (OCTG) in China.
Waldron Energy [TSX:WDN] - Eengaged in the exploration, development and production of petroleum and natural gas in the deep basin of West Central Alberta
Walter Energy [NYSE:WLT] - Leading producer and exporter of premium U.S. metallurgical coal for the global steel industry
Waratah Coal [private] - Holds extensive tenements in the Galilee Basin, west of Emerald in central Queensland,
Warren Resources [NASDAQ:WRES] - Coalbed methane natural gas in the Rocky Mountain region
Warrior Energy [TSX-V:WEN] - Junior oil and gas exploration and production company focused on identifying and exploiting natural gas opportunities.
Wasabi Energy [ASX:WAS] - Invests in companies and projects which it believes can provide solutions to world energy and environmental challenges
Watch Resources was acquired by BlackPearl Resources
wavefire [TSX-V:WAF] - Alberta
Wavefront Energy and Environmental Services [TSX-V:WEE] - Specializes in developing and designing leading-edge techniques and tools for oil well stimulation, improved oil production and environmental groundwater remediation
Wavegen is now Voith Hydro Wavegen Limited [a wholly owned subsidiary of Voith Siemens Hydro Power Generation - World leader in wave energy and wave power.. We developed and operate Limpet, the first commercial-scale wave energy device that generates wave energy for the grid.
Weatherford International [NYSE:WFT] - Drilling and Well Services division is a global provider of drilling tools and services, fishing services, intervention services, well construction services, and pipeline services. Completion and Production Systems division offers a comprehensive mix of products, services, technologies and expertise prepared to address the most challenging reservoir production problems.
WellPoint Systems [TSX-V:WPS] - Proven Solutions for Accounting, Operations, Land, Logistics, Materials, Project Management and other areas of Energy Financial Management
WellStar Energy [TSX-V:WST] - Natural gas (BC), Oil and gas (Alberta), and uranium (Saskatchewan)
Welton Energy was acquired by Churchill Energy, which was acquired by Zargon Energy Trust
Wentworth Energy [OTCBB:WNWG] - Focused on developing North American oil and natural gas reserves.
Wenzel Downhole Tools [TSX:WZL] - Leads the Drilling Industry with superior tools and exceptional service.
Wesport Resources was acquired by Kerr McGee, now Anadarko Petroleum
Wessex Exploration PLC [LSE:WSX] - Formed to explore the Wessex and Weald Basins of southern England
West Africa Energy is now Centric Energy
West Energy is now part of Daylight Energy
West Isle Energy [CNSX:WEI] - Western Canada
Western Canadian Coal was acquired by Walter Energy
Western Energy Services [TSX-V:WRG] - Contract drilling and production services
Western Gas was acquired by Anadarko Petroleum
Western Gas Partners [NYSE:WES] - own, operate, acquire and develop midstream energy assets in East and West Texas, the Mid-Continent and the Rocky Mountains.
Western GeoPower is now Ram Power
Western Oil Sands was acquired by Marathon Oil Corporation
Western Plains Petroleum [TSX-V:WPP] - Alberta and Saskatchewan, Canada.
Western Refining [NYSE:WNR] - Independent oil refiner and marketer headquartered in El Paso, Texas
Western Wind Energy [TSX-V:WND] - Developing wind parks
WesternZagros Resources [TSX-V:WZR] - Kurdistan region of Iraq.
WestFire Energy [TSX:WFE] - Inventory of low-risk drilling locations in four core areas: Redwater, Lloydminster and Bashaw all located in Alberta and West Central Saskatchewan
Westmoreland Coal Company [AMEX:WLB] - Surface coal mining operations in three western US states
Westralian Gas & Power is now Titan Energy
Westside Energy was acquired by Crusader Energy, which went bankrupt. Assets were acquired by Jones Energy
Wharf Resources plc - Australia and Slovakia
White Energy [ASX:WEC] - Coal and nickel assets
Whitecap Resources [TSX-V:WCP] - Oil and natural gas resource player operating in Western Canada
Whitehaven Coal [ASX:WHC] - Leading coal producer in the Gunnedah Basin
Whiting Petroleum Corporation [NYSE:WLL] - Engaged in oil and natural gas acquisition, exploitation, exploration and production activities primarily in the Gulf Coast/Permian Basin, Rocky Mountains, Michigan and Mid-Continent regions of the United States
Whittier Energy was acquired by Sterling Energy plc
Wild Brush Energy [Pinksheets:WBRE] - Developing its fossil fuel leases within the state of Wyoming, and a large scale Commercial Wind Farm in Europe
Wild Stream Exploration [TSX-V:WSX] - Commenced active operations with a recapitalization of Eagle Rock Exploration in October 2009
Wilon Resources was acquired by US Natural Gas Corp
Williams [NYSE:WMB] - Produce, gather, process and transport clean-burning natural gas to heat homes and power electric generation across the country.
Willbros Group [NYSE:WG] - Provides construction and engineering services to industry and government entities worldwide, specializing in pipelines and associated facilities in onshore, coastal and offshore locations
Winslow Resources was acquired by DualEx Energy
Winstar Resources [TSX:WIX] - Alberta, Tunisia and Hungary.
Wintershall AG [part of BASF Group] - Germany's largest producer of crude oil and natural gas
Wiser Oil was acquired by Forest Oil
Woodside Petroleum [ASX:WPL] - North West Shelf Project offshore Australia
World Fuel Services Corp [NYSE:INT] - Aviation and Marine Fuel Services.
WorleyParsons [ASX:WOR] - Provides services to the Hydrocarbons, Minerals, Metals & Chemicals, Industrial & Infrastructure, and Power industries.
Wrangler West Energy [TSX-V:WX] - Alberta
Wyn Development became Canada Gas, now Canada Rare Earths

COMPANY X
XTO Energy was acquired by Exxon Mobil Corporation
Xcite Energy [TSX-V:XEL] - Focused on the exploration and development of heavy oil resources in the North Sea on the United Kingdom Continental Shelf.
Xemplar Energy [TSX-V:XE] - Uranium exploration, Namibia
Xethanol is now Global Energy Holdings
Xtreme Drilling and Coil Services [TSX:XDC] - Drilling rigs

COMPANY Y
Yangarra Resources [TSX-V:YGR] - Alberta
Yanzhou Coal Mining Co. [NYSE:YZC] - Engaged in underground mining, preparation and sale of coal, and providing railway coal transportation services
Yoho Resources [TSX-V:YO] - Western Canadian Sedimentary Basin and initially focusing on the Peace River Arch.

COMPANY Z
Zaklad Robót Górniczych Krosno - Polish Company provides wide range of oil/gas fields services.
Zapata Energy is now Surge Energy
Zargon Energy Trust [TSX:ZAR] -
Zavanna - Using proprietary technology to seek large oil and gas fields in the U.S. and Canada
Zedi [TSX-V:ZED] - Systems and services that help oil and gas producers better manage people, assets and information
Zenas Energy was acquired by Tusk Energy
Zion Oil & Gas [AMEX:ZN] - Israel
Zone Resources [TSX-V:ZNR] - San Joaquin - Bakersfield Area


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Updated 12 December 2011
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