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Diamond Offshore Drilling, Inc. provides contract drilling services to the energy industry worldwide. As of December 31, 2021, the company operated a fleet of 12 offshore drilling rigs, including four drillships and eight semisubmersible rigs. It serves independent oil and gas companies, and government-owned oil companies. The company was founded in 1953 and is headquartered in Houston, Texas.

Noble Corp. Plc engages in the provision offshore drilling services for oil and gas industry. It focuses on a balanced fleet of floating and jackup rigs and the deployment of drilling rigs in oil and gas basins around the world. The company was founded by Lloyd Noble and Art Olson in 1921 and is headquartered in London, the United Kingdom.

Pacific Drilling S.A., together with its subsidiaries, operates as an offshore drilling contractor in the United States, Nigeria, and internationally. It provides offshore drilling services to the oil and natural gas industry. The company contracts its fleet of rigs to drill wells for its customers. It has a fleet of seven drillships. Pacific Drilling S.A. was founded in 2006 and is headquartered in Houston, Texas. On October 30, 2020, Pacific Drilling S.A., along with its affiliates, filed a voluntary petition for reorganization under Chapter 11 in the U.S. Bankruptcy Court for the Southern District of Texas.

Precision Drilling Corporation, a drilling company, provides onshore drilling, completion, and production services to exploration and production companies in the oil and natural gas and geothermal industries in North America and the Middle East. The company operates through Contract Drilling Services and Completion and Production Services segments. The Contract Drilling Services segment offers onshore well drilling services to exploration and production companies in the geothermal, oil and natural gas industry. This segment offers services include land and turnkey drilling; and procurement and distribution of oilfield supplies, as well as manufacture and repair of drilling and service rig equipment. In addition, it operates land drilling rigs in Canada, the United States, and the Middle East, as well as operates AlphaAutomation, AlphaApps, and AlphaAnalytics data services. The company offers EverGreen suite of environmental solutions comprising EverGreenMonitoring, EverGreenEnergy, and EverGreen Fuel Cell. The Completion and Production Services segment provides service rigs for well completion, workover, abandonment, maintenance, and re-entry preparation services; equipment rentals; and camp and catering services to oil and natural gas exploration and production companies. This segment operates well completion and workover service rigs in Canada and the United States. Precision Drilling Corporation was founded in 1951 and is headquartered in Calgary, Canada.

Valaris Limited, together with its subsidiaries, provides offshore contract drilling services Gulf of Mexico, South America, North Sea, the Middle East, Africa, and the Asia Pacific. The company operates through four segments: Floaters, Jackups, ARO, and Other. It owns an offshore drilling rig fleet, which include drillships, dynamically positioned semisubmersible rigs, moored semisubmersible rig, and jackup rigs. It serves international, government-owned, and independent oil and gas. Valaris Limited was founded in 1975 and is based in Hamilton, Bermuda.