Natural Gas Services Group, Inc. operates primarily through three business segments: Rental, Sales, and Aftermarket Services. The company's core business involves renting natural gas compression units that enhance the production of conventional and unconventional oil and gas wells, with a growing focus on large horsepower applications. In addition to its rental fleet, NGS designs and assembles custom compressor units for sale to customers. The company also provides comprehensive aftermarket services, including maintenance, parts, and commissioning of new units. NGS serves a diverse customer base of exploration and production (E&P) and midstream companies across major oil and gas producing basins in the United States.