Natural Gas Services Group, Inc. provides small to medium horsepower compression equipment to the natural gas industry in the United States. It focuses primarily on the non-conventional natural gas production businesses, such as coal bed methane, gas shale, and tight gas. The company engages in the compressor fabrication that assembles compressor components into compressor units for rental or sale; and engineers and fabricates natural gas compressors for sale to customers to meet their specifications based on well pressure, production characteristics, and applications. It also designs and manufactures reciprocating compressor frames, cylinders, and parts; designs, fabricates, sells, installs, and services flare stacks, and related ignition and control devices for the onshore and offshore incineration of gas compounds, such as hydrogen sulfide, carbon dioxide, natural gas, and liquefied petroleum gases; provides customer support for its compressor and flare businesses, and an exchange and rebuild program for screw compressors; maintains an inventory of new and used compressors; and services and maintains compressors. As of December 31, 2012, the company had a rental fleet of 2,279 natural gas compressors with approximately 311,401 horsepower. Natural Gas Services Group, Inc. was founded in 1998 and is headquartered in Midland, Texas.