Southwestern Energy is a natural gas exploration and production company organized in Delaware and headquartered in Spring, Texas. The company is ranked 893rd on the Fortune 500. The company's primary exploration and production activities are in the Appalachian Basin in Pennsylvania and West Virginia, as well as the Haynesville Shale. The company also controls 2,518,519 net undeveloped acres in New Brunswick, Canada, which are subject to an indefinite moratorium on hydraulic fracturing and cannot be developed at this time. As of December 31, 2021, the company had 21.148 trillion cubic feet of natural gas equivalent of estimated proved reserves, of which 68% was natural gas, 29% was natural gas liquids, and 3% was petroleum -- and all of which was in the Appalachian Basin. Wikipedia