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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.

Ensco Rowan plc provides offshore drilling services in various water depths worldwide. It operates a rig fleet of ultra-deepwater drillships, versatile semisubmersibles, and modern shallow-water jackups. The company's offshore fleet include 16 drillships, 12 semisubmersibles, 54 jackups, and 2 deepwater managed units. It serves offshore exploration and production companies, including integrated energy companies, national oil companies, and independent operators. The company was formerly known as Ensco plc and changed its name to Ensco Rowan plc in April 2019. Ensco Rowan plc was incorporated in 2009 and is headquartered in London, the United Kingdom.

Patterson-UTI Energy, Inc., through its subsidiaries, engages in the provision of contract drilling services to oil and natural gas operators in the United States and internationally. It operates through three segments: Drilling Services, Completion Services, and Drilling Products. The Contract Drilling Services segment provides contract and directional drilling services in onshore oil and natural gas basins, as well as engages in the service and re-certification of equipment for drilling contractors, and provision of electrical controls and automation to the energy, marine and mining industries. The Completion Services segment offers services for hydraulic fracturing, wireline and pumping, completion support, and cementing; and involved in the power solutions natural gas fueling, and logistics and storage businesses. The Drilling Products segment manufactures and distributes drill bits for energy and mining markets. It also provides software and services, such as MWD Survey FDIR, a data analytics technology to analyze MWD survey data in real-time and identify the position of a well; HiFi Nav, which enhances FDIR by targeting improved vertical placement of the directional well within the reservoir; HiFi Guidance, utilizes trajectory optimization to determine optimal steering recommendations and placement within the reservoir; and rents oilfield tools. The company was founded in 1978 and is headquartered in Houston, Texas.

Rowan Companies plc provides offshore contract drilling services to the oil and gas industry. The company operates through three segments: Deepwater, Jack-ups, and ARO. The Deepwater segment operates 4 ultra-deepwater drillships. The Jack-ups segment operates 15 self-elevating jack-up rigs. The ARO segment operates a fleet of 6 self-elevating jack-up rigs. The company operates in the United States Gulf of Mexico, Central and South America, the United Kingdom, the Middle East, Trinidad, and Norwegian sectors of the North Sea. Rowan Companies plc was founded in 1923 and is based in Houston, Texas.

Seadrill Ltd. engages in the provision of offshore drilling services to the oil and gas industry. It operates through the following segments: Floaters, Jack-up rigs, and Other. The Floaters segment encompasses drilling, completion, and maintenance of offshore exploration and production wells. the Jack-up Rigs segment includes drilling contracts relate to jack-up rigs for operations in harsh and benign environments in shallow water. The Other segment represents management services to third parties and related parties. The company was founded on May 10, 2005 and is headquartered in Hamilton, Bermuda.