Schlumberger is the world’s leading supplier of technology, integrated project management and information solutions to customers working in the oil and gas industry worldwide. Employing approximately 120,000 people representing over 140 nationalities and working in more than 85 countries, Schlumberger provides the industry’s widest range of products and services from exploration through production. The company comprises two business segments: Schlumberger Oilfield Services supplies a wide range of products and services from formation evaluation through directional drilling, well cementing and stimulation, well completions and productivity to consulting, software, information management and IT infrastructure services that support core industry operational processes. WesternGeco is the world's largest seismic company and provides advanced acquisition and data processing services. Schlumberger has principal offices in Houston, Paris and The Hague. Revenue was $42.15 billion in 2012. Schlumberger stock is listed on the New York Stock Exchange, ticker symbol SLB, on the Euronext Paris, Euronext Amsterdam, London and the SIX Swiss stock exchanges.