SOURCE: Atlas Energy Resources, LLC

November 14, 2007 09:00 ET

Atlas Energy Resources, LLC Announces Conversion of Class D Units

PITTSBURGH, PA--(Marketwire - November 14, 2007) - Atlas Energy Resources, LLC (NYSE: ATN) ("Atlas Energy") announced today that its unitholders approved the one-for-one conversion of each of its 16.7 million outstanding Class D units into Class B common units. As a result of the conversion, Atlas Energy currently has approximately 60.7 million Class B common units outstanding.

Atlas Energy Resources, LLC is an energy concern focused on the development and production of natural gas and, to a lesser extent, oil principally in the eastern United States. Atlas Energy sponsors and manages tax advantaged investment partnerships, in which it co-invests, to finance the exploration and development of its acreage in the Appalachian Basin and drills on its own account in the Antrim Shale of Michigan. For more information, visit Atlas Energy's website at or contact Investor Relations at

Atlas America, Inc. (NASDAQ: ATLS) owns an approximate 64% limited partner interest in Atlas Pipeline Holdings, L.P. (NYSE: AHD), which holds the general partner interest and 5.5 million limited partner units of Atlas Pipeline Partners, L.P. (NYSE: APL), and an approximate 48% Class B common unit interest and all of the Class A and management incentive interests in Atlas Energy Resources, LLC. For more information, please visit our website at, or contact Investor Relations at

Certain matters discussed within this press release are forward-looking statements. Although Atlas Energy Resources, LLC believes the expectations reflected in such forward-looking statements are based on reasonable assumptions, it can give no assurance that its expectations will be attained. Factors that could cause actual results to differ materially from expectations include financial performance, regulatory changes, changes in local or national economic conditions and other risks detailed from time to time in Atlas Energy's reports filed with the SEC, including quarterly reports on Form 10-Q, reports on Form 8-K and annual reports on Form 10-K.

Contact Information

    Brian J. Begley
    Vice President - Investor Relations
    Atlas Energy Resources, LLC
    215/553-8455 (fax)