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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.

Parker Drilling Co. engages in the provision of contract drilling and drilling-related services as well as rental tools and services. It operates through the Drilling Services and Rental Tools Services segment. The Drilling Services segment drills oil, natural gas, and geothermal wells for customers globally. The Rental Tools Services segment offers rental equipment and services to exploration and production companies, drilling contractors, and service companies on land and offshore in the U.S. and select international markets. The company was founded by Gifford C. Parker in 1934 and is headquartered in Houston, TX.

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.

Transocean Ltd., together with its subsidiaries, provides offshore contract drilling services for oil and gas wells worldwide. It contracts mobile offshore drilling rigs, related equipment, and work crews to drill oil and gas wells. The company operates a fleet of mobile offshore drilling units, consisting of ultra-deepwater floaters and harsh environment floaters. It serves integrated energy companies, government-owned or government-controlled energy companies, and other independent energy companies. The company was founded in 1926 and is based in Steinhausen, Switzerland.

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.