Chaparral Energy, Inc. is an Oklahoma City-based independent oil and natural gas exploration and production company founded in 1988. The company focuses on operations in the Mid-Continent region, specifically the STACK play and Mississippi Lime, and ranks as the nation’s third-largest producer of carbon dioxide enhanced oil recovery projects. In 2015, the firm employed 354 people and achieved an average daily production of 27.9 thousand barrels of oil equivalents, generating $324.3 million in annual revenue.