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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.
Saudi Aramco is deservedly #1 on this list. This company generates over $1 billion a day in revenue, produces the most barrels per day of any company and is sitting on the largest proven reserves in the world. This company began with Standard Oil of California striking oil in Saudi Arabia in the 1930s.