Tesco Corporation engages in the design, assembly, and service delivery of technology-based solutions for the upstream energy industry worldwide. It operates through Top Drive and Tubular Services segments. The Top Drive segment assembles and sells top drives that are used in drilling operations to rotate the drill string and/or casing while suspended from the derrick above the rig floor for drilling contractors, rig builders, equipment brokers, and exploration and production companies. It offers various portable and permanently installed top drive products that include hydraulically and electrically powered machines. This segment also provides top drive rental services on a day-rate basis for land and offshore drilling rigs; and after-market sales and services, rig up and training, top drive supervision, and ongoing maintenance and fleet management contracts services. The Tubular Services segment offers various automated offerings; and conventional casing and tubing running services for oil and natural gas operating companies, including independent companies, national oil companies, and other service companies. It also provides installation service of deep water completion equipment; and equipment and personnel for the installation of tubing and casing, including power tongs, pick-up/lay-down units, torque monitoring services, and connection testing services for new well construction, and in work-over and re-entry operations. The company was founded in 1966 and is headquartered in Houston, Texas.