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3TEC Energy Corporation USA, oil and gas exploration and production
A&B Geoscience Corporation Canada, exploration, production
Abraxas Petroleum Corporation USA; exploration, production, acquisition
Adair International Oil & Gas USA, exploration, production, merchant power
Adda Resources Ltd. Canada, exploration, development
Aera Energy LLC USA, oil and gas producer
Agiba Petroleum Company Egypt, joint venture Company for exploring, drilling and producing oil and gas in Egypt
Albian Sands Energy Inc. Canada, production, oil sands
Alfred Ward & Son USA, exploration, production
Allied Energy Corporation USA, exploration, production
Allied Oil and Gas Corp. Canada, identifies, acquires and manages investments in oil and gas
AltaCanada Energy Corp. Canada, exploration, production
Amadeus Petroleum NL Australia, acquiring, upgrading and expanding its proven oil and gas reserves
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