Southwestern Energy Company is an energy company engaged in natural gas and oil exploration, development and production (E&P). The Company is focused on creating and capturing additional value through its natural gas gathering and marketing businesses, which it refer to as Midstream Services. The Company conducts its business through subsidiaries. The Company’s operations are focused within the United States on development of two natural gas reservoirs located in Arkansas and Pennsylvania. Its operations in Arkansas are focused on a natural gas reservoir, Fayetteville Shale, and its operations in northeast Pennsylvania are focused on the natural gas reservoir, Marcellus Shale. The Company engages in natural gas gathering activities in Arkansas, Texas, Louisiana, Pennsylvania and West Virginia.