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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.
No. 7, R.A. According to Pass Fail, the Houston Chronicleâs finance analysis website, the 20 largest Houston-based oil and gas companies were valued at $868 billion in 2014. Among Houstonâs energy companies, Schlumberger had the largest market capitalization at $124 billion, making it the largest oil field services company in the world.