Southwestern Energy Co. is an independent holding company, which engages in the development and production activities including related natural gas gathering and marketing. It operates through the Exploration and Production (E&P); and Midstream Services segments. The E&P segment involves in the exploration and production of natural gas, oil, and natural gas liquids. The Midstream Services segment deals with natural gas gathering activities. The company was founded on July 2, 1929 and is headquartered in Spring, TX.