10 Biggest Oil Companies in the World

No. 5: PetroChina Company Limited (ADR) (NYSE:PTR)

PetroChina Company Limited (ADR) (NYSE:PTR)

Production: 4.4 million barrels a day

Petro China is the biggest out of three Chinese oil empires with a production amounting to 4.4 million barrels per day. In addition, the company has the highest market capital out of any other publicly traded oil corporation.