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T-3 Energy Services was acquired by Robbins & Myers, then acquired by National Oilwell Varco
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 becameFrontier Oilfield Services, now Galenfeha
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
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
TGC Industries is now Dawson Operating Company
TOA Oil - [TOKYO:5008] - Member of the Showa Shell Group, whose primary business is oil refining
TX Holdings [OTC:TXHG] - Low risk oil and gas leases in the Abilene area of West Texas. TX
Tailwind Energy [private] - UK continental shelf
Talisman Energy was acquired by Repsol in 2015.
Tallgrass Energy Partners [NYSE:TGE] - Owns and operate more than 8,300 miles of natural gas pipeline and more than 850 miles of crude pipeline,
Talos Energy [NYSE:TALO] - Leading offshore energy company focused on oil and gas exploration and production in the United States Gulf of Mexico and offshore Mexico.
Tamarack Valley Energy [TSX-V:TVE] - western Canadian sedimentary basin.
Tanganyika Oil was acquired by SINOPEC
Tangiers Petroleum is now 88 Energy
Tango Energy is now Tamarack Valley Energy
Tamboran Resources [ASX:TBN] - Natural gas exploration
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
Tatneft [MCX:TATN] - Russian oil producer
Tauber Oil [private] - Independent marketer of petroleum and petrochemical products
Team [NASDAQ:TISI] - Onstream leak repairs and hot tapping company
Technicoil was acquired by Essential Energy Services
Technip [NYSE Euronext:TEC] - 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 Sinopec Canada
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.
Terna Energy SA [Athens:TENERGY] - Renewable Energy Sources company undertaking the Development, Construction, Financing, and Operation of renewable energy projects
Terrace Energy [TSX-V:TZR] - Onshore oil and gas, USA.
TerraForm Power was acquired by Brookfield Renewable Partners
Terraquest Energy became Masters Energy, which was acquired by Zargon Oil & Gas
Tesco was acquired by Nabors Industries
Tesla Exploration [TSX:TXL] - Offer a complete range of seismic acquisition services to the oil and gas exploration industry.
Tesoro became Andeavor, acquired by Marathon Petroleum
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 was acquired by Sundance Energy
Thaioil [Bangkok:TOP] - Leading independent petroleum refiner and supplier of refined petroleum products in Thailand.
Thunderbird Energy is now Gordon Creek Energy
Tidewater [NYSE:TDW] - Offshore marine service industry
Tiger Oil and Energy [OTC:TGRO] - Kansas and Oklahoma.
Tipperary Corporation was acquired by Santos
Titan Energy became TTE Petroleum, now Global Energy Venture
Todco was acquired by Hercules Offshore
Todd Energy [private] - Energy exploration, production and delivery
Tom Brown was acquired by Encana, now Ovintiv
Tomahawk Energy is now K2 Energy
TomCo Energy Plc [LSE:TOM] - Oil Shale assets in the State of Utah, USA.
Top Ships [NASDAQ:TOPS] - International owner of modern, fuel efficient "ECO" tanker vessels focusing on the transportation of petroleum products and bulk liquid chemicals
Torrens Energy is now High Peak Royalties
Toscana Energy was acquired by i3 Energy
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
Tourmaline Oil [TSX:TOU] - Western Canadian Sedimentary Basin
Tower Resources plc [LSE:TRP] - Independent oil and gas exploration company with a regional focus on sub-Saharan Africa.
Trans Energy was acquired by EQT
TransAtlantic Petroleum [TSX:TNP] - Principal assets are located in the United States and in Nigeria
Transerv is now Whitebark Energy
TransGlobe Energy [AMEX:TGA] - Production Sharing Agreements in the Republic of Yemen
TransMontaigne Partners LLC Provides terminaling, storage, transportation and related services for petroleum and other liquid products.
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 is now Jersey Oil & Gas
Traverse Energy is in receivership
Trek Resources [OTC:TRKX] - Oil and natural gas properties in conventional producing areas of the United States
Triangle Energy [ASX:TEG] - production of oil and gas in Indonesia
Trican Well Services [TSX:TCW] - Oil and gas services
Trident Exploration is now in Receivership
Trillion Energy [CSE:TCF] - Upstream natural gas producer focused on developing conventional and unconventional natural gas in Turkey and Bulgaria.
Trilogy Energy Trust was acquired by Paramount Resources
Trina Solar [NYSE:TSL] - Designs, develops, manufactures, and sells photovoltaic modules worldwide
Trinidad Drilling was acquired by Ensign Energy Services
Trinity E&P [LSE:TRIN] - Trinidad & Tobago focused independent E&P Company
Trioil merged into Yangarra Resources
Triple Energy [ASX:TNP] - 80% interest in an coal mine gas project in the Hielongjiang province of China.
TriStar Oil & Gas has been acquired by PetroBakken Energy, became Lightstream Resources, now Ridgeback Resources
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.
Tsakos Energy Navigation [NYSE:TNP] - Controls a versatile fleet of modern crude and product tankers
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 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.
Twin Butte Energy [Receivership] - Assets sold to West Lake Energy
Twinza Oil - Pasca A liquids-rich gas field offshore Papua New Guinea.
Twister BV - Innovative technologies and services for the gas processing industry

U&D Coal [ private ] - Coal exploration and development company in Queensland.
UK Coal [LSE:UKC] - Britain's biggest producer of coal and a company with substantial land and property interests
UK Oil & Gas PLC [LSE:UKOG] - Oil and gas assets located in the Weald Basin in southern England.
U.S. Geothermal [AMEX:HTM] [TSX:GTH] - Idaho geothermal reservior.
US Natural Gas Corp [OTC:UNGS] - Operations are concentrated in the Appalachian Basin within the states of Kentucky and West Virginia.
UTS Energy was acquired by Total SA
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, now Obsidian Energy
Union Drilling [UDRL] - Provides contract land drilling services and equipment to oil and gas companies in the United States.
Union Jack Oil [LSE:UJO] - Drilling, development, and investment in the UK onshore hydrocarbon sector.
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 Coal is a Metinvest subsidiary of SCM Limited
United Oil & Gas [LSE:UOG] -Independent oil & gas start-up established in 2015.
United Orogen Limited became Orogen Minerals, acquired by Oil Search Limited
United Refining - Regional refiner and marketer of petroleum products
Uniterre Resources became Nai KUn Wind Energy, now Oceanic 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 is now Red Oak Mining
Unocal was acquired by Chevron
Upton Resources was acquired by StarPoint Energy, then Canetic Resources Trust, then Penn West Energy Trust, now Obsidian Energy

VAALCO Energy, Inc. [AMEX:EGY] - Texas Gulf Coast and Gabon..
VHGI Holdings [OTC:VHGI] - Landree Mine, which is located two miles south of Jasonville, IN (Wright Township) in Greene County
VSUS Technologies is now New Colombia Resources
Valaris plc (merger of Ensco plc and Rowan) [NYSE:VAO - Diverse rig fleet of ultra-deepwater drillships, versatile semisubmersibles and modern shallow-water jackups
Valiant Energy was acquired by Peerless Energy, which was acquired by Petrobank Energy and Resources Ltd.
Valiant Petroleum plc was acquired by Ithaca Energy
Validus Energy [private] - Primary objective is to build and operate a large-scale portfolio of producing wells and drilling locations in the Eagle Ford Shale.
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.
Valkyries Petroleum is now part of Lundin Energy
Vallourec [Paris:VLLP] - Seamless steel tubes for oil industry
Vanco Energy [private] - Acquired licenses offshore eight African countries
Vanguard Natural Resources (Chapter 11) is now Grizzly Energy
Vantage Drilling International [OTC:VTGDF] - Offshore drilling contractor that operates and manages a fleet of modern, high specification drilling rigs on a worldwide basis.
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, now Obsidian Energy
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
Vintage Energy [ASX:VEN] - Established to acquire, explore and develop energy assets principally within, but not limited to, Australia
Vintage Petroleum was acquired by Occidental Petroleum
Viper Energy Partners [NASDAQ:VNOM] - Assets consist of mineral interests in oil and natural gas properties in the Permian Basin in West Texas
Viracocha Energy was acquired by Provident Energy Trust
VivoPower International PLC [NASDAQ:VVPR] - International battery technology, electric vehicle, solar and critical power services company.
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.

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.
WPX Energy [NYSE:WTI] - Independent energy producer with core positions in the Permian and Williston basins. Will be merging with Devon Energy
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
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
Waterberg Coal Company [ASX:WCC] - Waterberg project in South Africa
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
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 was acquired by P2 Energy Solutions
Welton Energy was acquired by Churchill Energy, which was acquired by Zargon Energy Trust
Wentworth Energy [OTC:WNWG] - Focused on developing North American oil and natural gas reserves.
Wentworth Resources plc [LSE:WEN] - Exploration and Production company with domestic gas production and exploration assets in the Rovuma Basin of Southern Tanzania and Northern Mozambique.
Wenzel Downhole Tools [TSX:WZL] - Leads the Drilling Industry with superior tools and exceptional service.
Wesport Resources was acquired by Kerr McGee, became Anadarko Petroleum, now Occidental Petroleum
West Africa Energy is now Centric Energy
West Energy is now part of Sinopec 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, now Occidental Petroleum
Western Midstream 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 merged with Tesoro, acquired by Marathon Petroleum
Western Wind Energy was acquired by Brookfield Renewable Partners
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
Wharf Resources plc - Australia and Slovakia
White Energy [ASX:WEC] - Coal and nickel assets
Whitebark Energy [ASX:WBE] - Perth-based company with production and exploration assets in Canada and Australia.
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] - One of the largest independent exploration and production companies in the USA with an oil focused asset base.
Whittier Energy was acquired by Sterling Energy plc
Wild Brush Energy [OTC:WBRE] - Developing its fossil fuel leases within the state of Wyoming, and a large scale Commercial Wind Farm in Europe
Wild Stream Exploration was acquired by Crescent Point Energy
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 was acquired by Primoris
Winslow Resources was acquired by DualEx Energy
Winstar Resources was acquired by Serinus Energy
Wintershall AG [part of BASF Group] - Germany's largest producer of crude oil and natural gas
Wiser Oil was acquired by Forest Oil
Wood Group [LSE:WG] - Provides performance-driven solutions across a broad range of industrial markets, including the upstream, midstream and downstream oil & gas, power & process, environment and infrastructure, clean energy, mining, nuclear, and general industrial sectors.
Woodside Petroleum [ASX:WPL] - North West Shelf Project offshore Australia
World Fuel Services Corp [NYSE:INT] - Aviation and Marine Fuel Services.
World Oil Resources [ASX:WLR] - Focused on oil exploration and production on-shore Brazil.
Worley [ASX:WOR] - Provides services to the Hydrocarbons, Minerals, Metals & Chemicals, Industrial & Infrastructure, and Power industries.
Wrangler West Energy was acquired by Trident Exploration, now in Receivership
Wyn Development became Canada Gas, now Canada Rare Earths

XTO Energy was acquired by ExxonMobil
Xemplar Energy [TSX-V:XE] - Uranium exploration, Namibia
Xinergy [TSX:XRG] - Central Appalachian coal producer.
Xtract Energy plc [LSE:XTR] -
Xtreme Drilling was acquired by Akita Drilling

Yancoal [ASX:YAL] - Operates seven mines located in some of the richest coal reserves in New South Wales and Queensland.
Yangarra Resources [TSX-V:YGR] - Alberta
Yanchang Petroleum [HK:0346] -
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.
Yuma Energy [NYAW:YUMA] - Focuses on the exploration for, and development of, conventional and unconventional oil and gas prospects, primarily through the use of 3-D seismic surveys in the U. S. Gulf Coast region.

Zapata Energy is now Surge Energy
Zargon Oil & Gas [TSX:ZAR] - Calgary based Western Canadian oil and gas producer.
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
Zenith Energy [LSE:ZEN] - Independent oil & gas company with production, exploration and development assets in the Republic of the Congo, Italy and Tunisia.
Zephyr Energy [LSE:ZPHR] - Oil and gas interests in the Rocky Mountain region of the United States.
Zeta Petroleum plc [ASX:ZTA] - Romania
Zion Oil & Gas [NASDAQ:ZN] - Israel

Attis Oil and Gas (was Mayan Energy) is npw Helium One
Cadillac Ventures (was KFG Resources) [TSX-V:CDC] -
Calima Energy (was Rialto Energy, previouly became Azonto Petroleum) [ASX:CE1] - Oil and gas producer in Western Canada.
Chaucer Energy [ASX:CHA] - Energy projects utilising the technology of In-Situ Gasification.
Helium One (was Attis Oil and Gas, previously Mayan Energy) [LSE:HE1] - Focus is to explore, develop, and ultimately, become a producer of high-grade helium for the international market
Velvet Energy [private] (was Iron Bridge Resources, previously RMP Energy)
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Companies Filed
Challenger Exploration Evolve Transition Infrastructure LP Hartshead Resources Kolibri Global Energy Oando plc Orcadian Energy plc

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