Nabors Industries Office, Texas

Nabors currently owns and operates the largest land-based drilling rig fleet in the world, and is a major provider of oil and gas completion and production services. Nabors is also one of the leading suppliers of offshore platform workover and drilling rigs, both domestically and internationally. At last count, the company has 44 offshore rigs, 500 land-based rigs, 444 land-based workover rigs, and 37 offshore platforms, working all over the world. Nabors is a major driller on the North Slope of Alaska, Canada, and in the western United States. The company was formed in 1952, and grew with aggressive acquisitions at a time when the industry was in a slump. Nabors has a number of rig construction yards, including one in Crosby, near Houston. The company headquarters is in Bermuda.