National Oilwell Varco is an American multinational corporation based in Houston, Texas. It is a leading worldwide provider of equipment and components used in oil and gas drilling and production operations, oilfield services, and supply chain integration services to the upstream oil and gas industry. The company operates through four segments: Rig Technologies, Wellbore Technologies, Completion & Production Solutions, and Rig Aftermarket. National Oilwell Varco has operations in more than 60 countries and has a workforce of over 34,000 employees.