Tereshchenko Dmitry/Shutterstock Save for later Print Download Share LinkedIn Twitter Energy Intelligence's ranking of the world's 50 largest oil companies is based on operational data from over 130 firms. The focus on operations permits meaningful comparisons of all types of companies — including state-owned firms — and thus differs from more financially oriented corporate rankings. This unique system, which has been used for over 30 years, uses oil and gas reserves, oil and gas production, refinery distillation capacity and product sales volumes as ranking criteria.
