Schlumberger Limited
Schlumberger Limited is the world's largest oilfield services company. Schlumberger employs approximately 100,000 people representing more than 140 nationalities working in more than 85 countries. Schlumberger has four principal executive offices located in Paris, Houston, London, and The Hague.
Schlumberger is incorporated in Willemstad, Curaçao as Schlumberger N.V. and trades on the New York Stock Exchange, Euronext Paris, the London Stock Exchange, and SIX Swiss Exchange. Schlumberger is a Fortune 500 company, ranked 287 in 2016, and also listed in Forbes Global 2000, ranked 176 in 2016.
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Source: https://en.wikipedia.org/wiki/Schlumberger