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Being the biggest oil company in Russia, Rosneft is also the largest publicly traded company in the world based on its hydrocarbon production volume. BP holds a 19.75 % share in Rosneft which makes it a beneficiary to a broad range of existing and future projects in Russia, a country that has huge hydrocarbon resources.
The Worldâs Biggest State Owned Oil Companies. Government-controlled companies dominate the ranks of the world's largest energy producers. In fact, based on combined oil and gas production figures for 2014, 15 of the world's 20 biggest energy-producing companies are state-owned enterprises controlled by national governments.