Chesapeake Energy Corporation (Chesapeake) is a natural gas and oil exploration and production company. Chesapeake is engaged in the exploration, development and acquisition of properties for the production of natural gas and oil from underground reservoirs. It also provides substantial marketing, midstream, drilling and other oilfield services. Its operations are located onshore and in the continental United States. In October 2012, the Company sold asset packages in the Permian Basin. In August 2013, SemGroup Corporation completed acquisition of the gas gathering and processing assets owned by Chesapeake Energy Corporation. In January 2014, Chesapeake Energy Corp completed the sale of 100% of its ownership interest in Chaparral Energy, Inc.