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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.
4. ExxonMobil ($394 billion) â the Texas-based oil major is one of the most iconic oil companies, and it is the largest private company by production with 5.3 mb/d. When Exxon acquired Mobil in 1999 â both companies are descendants of John D. Rockefellerâs Standard Oil â it created the largest company on the planet.