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The desert kingdom has around 16% of the worldâs proven oil reserves and is the biggest global exporter of petroleum liquids. There is little doubt as to why its national oil company, Saudi Aramco, the biggest energy company in the world, generates over $1 billion in revenue every single day.
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.