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Erin Energy Corporation, an independent exploration and production company, engages in the acquisition and development of energy resources in Africa. Its asset portfolio consists of five licenses covering an area of approximately 6,000 square kilometers across offshore Nigeria, offshore Ghana, and offshore The Gambia. The company was formerly known as CAMAC Energy Inc. and changed its name to Erin Energy Corporation in April 2015. The company was founded in 2005 and is headquartered in Houston, Texas. Erin Energy Corporation is a subsidiary of CAMAC Energy Holdings Limited. On July 13, 2018, the voluntary petition of Erin Energy Corporation for reorganization under Chapter 11 was converted to Chapter 7. It had filed for Chapter 11 bankruptcy on April 25, 2018.

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.

Pioneer Energy Services Corp. provides land-based drilling and production services to oil and gas exploration and production companies. It provides contract land drilling services in the Marcellus/Utica, Permian Basin and Eagle Ford, and Bakken regions, as well as in Colombia. The company operates 16 AC rigs in the United States and 8 SCR rigs in Colombia. It also provides well, wireline, and coiled tubing services to various exploration and production companies in the onshore oil and gas producing regions in the Gulf Coast, Mid-Continent, and Rocky Mountain states. As of December 31, 2018, the company had a fleet of 113 rigs with 550 horsepower and 12 rigs with 600 horsepower; and 9 coiled tubing units. The company was formerly known as Pioneer Drilling Company and changed its name to Pioneer Energy Services Corp. in 2012. Pioneer Energy Services Corp. was founded in 1968 and is headquartered in San Antonio, Texas.

Sauer Energy, Inc. develops and markets vertical axis wind turbines (VAWT) systems. The company focuses on providing its VAWT systems primarily under the WindCutter name. Its VAWT systems are would be used in residential and commercial buildings, oil rigs and off-shore platforms, ships, Islands and other remote facilities, and communications towers and bridges, as well as various industrial applications. Sauer Energy, Inc. was founded in 2008 and is headquartered in Oxnard, California.

Vantage Drilling Company is in liquidation. Previously, the company was engaged in the provision of offshore contract drilling services for multinational oil and natural gas companies, government owned oil and natural gas companies, and independent oil and natural gas producers in the United States and internationally. Vantage Drilling Company was founded in 2007 and is based in Houston, Texas.