6. China National Petroleum Corporation (CNPC):

With its 1.6 million staff, China National Petroleum Corporation headquartered at Beijing, ranks sixth on the list. One of the world’s major oilfield service providers, CNPC is reportedly China’s largest oil and gas producer and supplier. And it is an internationally reputed contractor in engineering construction. As of June 2010, in terms of market capitalization, its subsidiary PetroChina places in the second position in the world.

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