Atlas Energy, L.P., (Atlas Energy) is an independent developer and producer of natural gas and oil, with operations in the Appalachian Basin, Illinois Basin and the Rocky Mountain region. As of December 31, 2011, its principal development and production assets consisted of working interests in approximately 8,500 gross producing natural gas and oil wells; royalty interests in over 500 gross producing natural gas and oil wells; net daily production of 35.9 million cubic feet equivalent per day; proved reserves of 167.6 billion cubic feet equivalent, and its partnership management business, which includes interests in 98 investment partnerships and a registered broker-dealer that acts as the dealer-manager of its investment partnership offerings. It maintains ownership interests in the entities, which includes Atlas Pipeline Partners, L.P. and Lightfoot Capital Partners, LP and Lightfoot Capital Partners GP, LLC. On February 17, 2011, it acquired certain assets from Atlas Energy, Inc.