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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.

Diamond Offshore Drilling, Inc. provides contract drilling services to the energy industry worldwide. The company operates a fleet of 13 offshore drilling rigs, including four drillships and nine 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. Diamond Offshore Drilling, Inc. is a subsidiary of Loews Corporation. On April 26, 2020, Diamond Offshore Drilling, Inc., along with its affiliates, filed a voluntary petition for reorganization under Chapter 11 in the United States Bankruptcy Court for the Southern District of Texas.

Seadrill Limited provides offshore drilling services to the oil and gas industry worldwide. It operates in three segments: Harsh Environment, Floaters, and Jack-ups Rigs. The company owns and operates drillships, semi-submersible rigs, and jack-up rigs for operations to ultra-deepwater in benign and harsh environments. It offers management services to third parties and related parties. The company operates a fleet of 34 drilling units, including 7 drill ships, 12 semi-submersible rigs, and 15 jack-up rigs. It serves oil super-majors, state-owned national oil companies, and independent oil and gas companies. Seadrill Limited was incorporated in 2005 and is headquartered in Hamilton, Bermuda. On February 10, 2021, Seadrill Limited, 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.

Valaris plc provides offshore contract drilling services in various water depths to oil and gas industry worldwide. The company operates through four segments: Floaters, Jackups, ARO, and Other. As of December 31, 2020, it owned and operated 11 drillships, 4 dynamically positioned semisubmersible rigs, 1 moored semisubmersible rig, 45 jackup rigs, and 7 ARO rigs, as well as 2 rigs under construction. The company was formerly known as Ensco Rowan plc and changed its name to Valaris plc in July 2019. The company was incorporated in 2009 and is based in London, the United Kingdom. On August 19, 2020, Valaris plc, 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.

Western Energy Services Corp. operates as an oilfield service company in Canada and the United States. It operates through Contract Drilling and Production Services segments. The Contract Drilling segment provides contract drilling services using drilling rigs and auxiliary equipment. The Production Services segment offers well servicing rig and related equipment, as well as rental equipment services. Western Energy Services Corp. is headquartered in Calgary, Canada.