PostRock Energy Corporation, an independent oil and gas company, engages in the acquisition, exploration, development, production, and gathering of crude oil and natural gas. It primarily focuses on the production of conventional oil and coal bed methane gas from its properties located in the Cherokee basin, a region in southeastern Kansas, northeastern Oklahoma, and central Oklahoma. The company also has minor oil and gas producing properties in the Appalachian basin. Its estimated proved reserves include 119.1 billion cubic feet of natural gas and 4.1 million barrels of oil. PostRock Energy Corporation was founded in 1982 and is headquartered in Oklahoma City, Oklahoma. On December 21, 2018, the voluntary petition of PostRock Energy Corporation for reorganization under Chapter 11 was converted to Chapter 7. It had filed for Chapter 11 bankruptcy on April 1, 2016.