Noble Energy, Inc. (Noble Energy) is an independent energy company engaged in worldwide oil and gas exploration and production. Noble Energy has operations in five core areas: the DJ Basin (onshore United States), the Marcellus Shale (onshore United States), the deepwater Gulf of Mexico (offshore United States), offshore West Africa and offshore Eastern Mediterranean. The areas provide most of its crude oil and natural gas production; visible growth from development projects, and numerous exploration opportunities. In August 2012, it sold the Dumbarton and Lochranza properties in the North Sea to Maersk Oil North Sea Limited. In September 2012, it sold certain oil and natural gas properties in the Permian Basin to Sheridan Holding Company II, LLC. In September 2012, Unit Corporation�s wholly owned subsidiary, Unit Petroleum Company, acquired certain oil and natural gas assets from the Company.