Abu Dhabi National Oil Company
Abu Dhabi; exploration, development, production and marketing of oil and gas, and downstream refining, distribution and marketing of petroleum products, Liquefied Natural Gas (LNG) production and marketing

Alberta Energy Company Ltd.
Canada; exploration; production, transmission, natural gas storage, gas liquids processing

Amerada Hess Corporation
USA; exploration, production, transmission, refining, marketing

American International Petroleum Corporation
USA, oil and natural gas exploration and development; refining, transportation

Aurora Power Resources, Inc.
USA, gas distribution, exploration, production

BG Group
UK; exploration, production, marketing; transmission, storage, Transco, distribution; NGC Corporation

BG International
UK, gas and oil exploration and production, gas transportation, distribution

BHP Billiton
Australia; exploration, production, transmission, refining, marketing, chemicals; minerals, natural gas, LPG

BP Amoco p.l.c.
UK, exploration, production, refining, marketing, transmission

Capex
Argentina, production, natural gas, LPG, gasoline