Nabors Industries owns and operates nearly 600 land drilling and 970 land workover and well servicing rigs throughout the world. Offshore, Nabors operates more than 40 platforms, 17 jack-ups and three barge rigs in the domestic and international markets. It also markets 30 marine transportation and support vessels, primarily in the Gulf of Mexico. Additionally, the company manufactures top drives and drilling instrumentation systems while providing comprehensive oilfield hauling, engineering, civil construction, logistics and facilities maintenance, and project management services. Nabors Industries participates in some of the most significant oil, gas and geothermal markets in the world. The company is located in Houston, and is publicly traded on the American Stock Exchange under the ticker symbol NBR.