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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.

Kodiak Gas Services, Inc. operates contract compression infrastructure for customers in the oil and gas industry in the United States. It operates in two segments, Compression Operations and Other Services. The Compression Operations segment operates company-owned and customer-owned compression infrastructure to enable the production, gathering, and transportation of natural gas and oil. The Other Services segment provides a range of contract services, including station construction, maintenance and overhaul, and other ancillary time and material-based offerings. The company was formerly known as Frontier TopCo, Inc. Kodiak Gas Services, Inc. was founded in 2010 and is headquartered in The Woodlands, Texas.

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; Other Services; and Telecommunications. The Natural Gas Transportation segment transports natural gas through pipeline system to distribution companies, power plants, and industrial customers. It also 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. The Other Services segment offers midstream services, including natural gas treatment, separation, and removal of impurities from the natural gas stream, as well as natural gas compression. It also provides services related to pipeline and compression plant construction, operation, and maintenance; and generates steam for electricity production. The Telecommunications segment provides telecommunication services with a network that includes a microwave digital network with synchronous digital hierarchy technology, and a dark fiber optic network. 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.