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 business, 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 sale or rent; and engineers and fabricates natural gas compressors for sale to customers to meet their specifications based on well pressure, production characteristics, and compression 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 an exchange and rebuild program for screw compressors and maintains an inventory of new and used compressors; and services and maintains compressors. The company rents small to medium horsepower compression equipment to customers under contracts. As of December 31, 2011, it had 2,120 natural gas compressors in its rental fleet totaling approximately 287,764 horsepower; and 1,575 natural gas compressors totaling approximately 220,213 horsepower rented to customers. Natural Gas Services Group, Inc. was founded in 1998 and is based in Midland, Texas.