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Archrock, Inc., together with its subsidiaries, operates as an energy infrastructure company in the United States. The company operates in two segments, Contract Operations and Aftermarket Services. It engages in the designing, sourcing, owning, installing, operating, servicing, repairing, and maintaining of its owned fleet of natural gas compression equipment to provide natural gas compression services. The company also sells over-the-counter parts and components; and provides operations, major and routine maintenance, overhaul, and reconfiguration services to customers who own compression equipment. It serves integrated and independent oil and natural gas processors, gatherers, and transporters. The company was formerly known as Exterran Holdings, Inc. and changed its name to Archrock, Inc. in November 2015. Archrock, Inc. was founded in 1990 and is headquartered in Houston, Texas.

Enable Midstream Partners LP owns, operates and develops natural gas and crude oil infrastructure assets. It operates through the following segments: Gathering & Processing, and Transportation & Storage. The Gathering and Processing segment provides natural gas gathering, processing, and fractionation services, as well as crude oil gathering services for its producer customers. The Transportation and Storage segment offers interstate and intrastate natural gas pipeline transportation and storage services to natural gas producers, utilities, and industrial customers. The company was founded on May 1, 2013 and is headquartered in Oklahoma, OK.

Transportadora de Gas del Sur S.A. engages in transportation of natural gas, and production and commercialization of natural gas liquids in Argentina and internationally. The company operates through four segments: Natural Gas Transportation Services; Liquids Production and Commercialization; Midstream; and Telecommunications. The Natural Gas Transportation segment transports natural gas through pipeline system to distribution companies, power plants, and industrial customers. It provides operation and maintenance services for the natural gas transportation facilities. The Liquids Production and Commercialization segment produces and commercializes natural gas liquids, such as ethane, liquid petroleum gas, natural gasoline, propane, and butane. This segment offers certain related services comprising reception, storage, and dispatch of the liquids. The Midstream segment provides natural gas conditioning services; treatment, removal of impurities and natural gas compression, including the collection and transport of natural gas; and inspection and maintenance of pipelines and compressor plants services. In addition, this segment offers steam generation for electricity production and management services for expansion works and steam generation for the production of electricity. The Telecommunications segment offers data transmission services through a network of digital terrestrial radio relay. It serves residential, commercial, industrial, and electric power generation end users. The company was incorporated in 1992 and is headquartered in Buenos Aires, Argentina. Transportadora de Gas del Sur S.A. is a subsidiary of Compañía de Inversiones de Energía S.A.

USA Compression Partners, LP provides compression services under term contracts with customers in the natural gas and crude oil industries in the United States. The company engineers, designs, operates, services, and repairs its compression units; and maintains related support inventory and equipment. It also provides compression services in various shale plays, including the Utica, Marcellus, Permian Basin, Delaware Basin, Eagle Ford, Mississippi Lime, Granite Wash, Woodford, Barnett, Haynesville, Niobrara, and Fayetteville shales. As of December 31, 2017, the company had approximately 1,799,781 horsepower in its fleet. It serves oil companies; and independent producers, processors, gatherers, and transporters of natural gas and crude oil. USA Compression GP, LLC operates as the general partner of USA Compression Partners, LP. The company was formerly known as Compression Holdings, LP, and changed its name to USA Compression Partners, LP in June 2011. USA Compression Partners, LP was founded in 1998 and is headquartered in Austin, Texas.