Atlas Energy Resources LLC

(ATLS)

Atlas Energy, L.P. is a publicly-traded master limited partnership ("MLP"). Atlas Energy also owns Atlas Pipeline Partners, L.P., a midstream energy service provider engaged in the gathering and processing of natural gas in the Mid-Continent region of the U.S., namely in Oklahoma and Texas.

Atlas Energy owns the general partner of Atlas Resource Partners, L.P. ( “ARP” – NYSE: ARP), active in oil and gas production in the Appalachian Basin & Niobrara region in Colorado, as well as the leading sponsor of tax advantaged direct investment oil and gas partnerships. Atlas Energy also owns the general partner of Atlas Pipeline Partners, L.P. (“APL” – NYSE: APL), a midstream energy service provider engaged in the gathering and processing of natural gas in the Mid-Continent region of the U.S., namely in Oklahoma and Texas.