Atlas Resource Partners, L.P. Announces Public Offering Of Common Units

Atlas Resource Partners, L.P. (NYSE: ARP) announced today that it has commenced an underwritten public offering of 6,800,000 common units representing limited partner interests. Wells Fargo Securities, BofA Merrill Lynch, Deutsche Bank Securities, Citigroup, J.P. Morgan, Morgan Stanley and RBC Capital Markets are acting as joint book-running managers for this offering. The underwriters have been granted a 30-day option to purchase up to an additional 1,020,000 common units.

ARP intends to use the net proceeds from this offering to fund a portion of its acquisition of oil & gas producing assets and undeveloped acreage in the Fort Worth Basin (TX) from DTE Energy. Prior to funding the pending acquisition, ARP may use some or all of the net proceeds for general partnership purposes, which may include repayment of outstanding borrowings under its revolving credit facility.

The offering is being made only through the prospectus supplement and accompanying prospectus, which is part of a registration statement that became effective on April 13, 2012. This press release shall not constitute an offer to sell or the solicitation of an offer to buy any securities nor will there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or other jurisdiction.

Copies of the prospectus and accompanying preliminary prospectus supplement relating to these securities may be obtained by contacting:

Wells Fargo SecuritiesAttn: Equity Syndicate Department375 Park AvenueNew York, NY 10152Phone: (800) 326-5897Email: cmclientsupport@wellsfargo.com

BofA Merrill Lynch222 BroadwayNew York, NY 10038Attn: Prospectus DepartmentEmail: dg.prospectus_requests@baml.com

CitigroupAttn: Prospectus Dept.Brooklyn Army Terminal140 58 th St., 8 th FloorBrooklyn, NY 11220Phone: (800) 831-9146Email: batprospectusdept@citi.com

Deutsche Bank SecuritiesAttn: Prospectus Group60 Wall StreetNew York, NY 10005Phone: 800-503-4611

J.P. MorganC/o Broadridge Financial Solutions1155 Long Island AvenueEdgewood, NY 11717Phone: 866-803-9204

Morgan StanleyAttn: Prospectus Dept.180 Varick Street, 2nd FloorNew York, NY 10014Email: prospectus@morganstanley.comPhone: 866-718-1649

RBC Capital MarketsAttn: Prospectus Department3 World Financial Center200 Vesey Street, 8th FloorNew York, New York 10281-8098Phone: (877) 822-4089

Atlas Resource Partners, L.P. (NYSE: ARP) is an exploration & production master limited partnership which owns an interest in over 9,900 producing natural gas and oil wells, primarily in Appalachia and the Barnett Shale in Texas. ARP is also the largest sponsor of natural gas and oil investment partnerships in the U.S. For more information, please visit our website at www.atlasresourcepartners.com, or contact Investor Relations at InvestorRelations@atlasenergy.com.

Atlas Energy, L.P. (NYSE: ATLS) is a master limited partnership which owns all of the general partner Class A units and incentive distribution rights and an approximate 52% limited partner interest in its upstream oil & gas subsidiary, Atlas Resource Partners, L.P. Additionally, Atlas Energy owns and operates the general partner of its midstream oil & gas subsidiary, Atlas Pipeline Partners, L.P., through all of the general partner interest, all the incentive distribution rights and an approximate 11% limited partner interest. For more information, please visit our website at www.atlasenergy.com, or contact Investor Relations at InvestorRelations@atlasenergy.com.

Cautionary Note Regarding Forward-Looking Statements

This document contains forward-looking statements that involve a number of assumptions, risks and uncertainties that could cause actual results to differ materially from those contained in the forward-looking statements. ARP cautions readers that any forward-looking information is not a guarantee of future performance. Such forward-looking statements include, but are not limited to, statements about future financial and operating results, resource potential, ARP’s plans, objectives, expectations and intentions and other statements that are not historical facts. Risks, assumptions and uncertainties that could cause actual results to materially differ from the forward-looking statements include, but are not limited to, those associated with general economic and business conditions; ARP’s ability to close the DTE acquisition; changes in commodity prices; changes in the costs and results of drilling operations; uncertainties about estimates of reserves and resource potential; inability to obtain capital needed for operations; ARP’s level of indebtedness; changes in government environmental policies and other environmental risks; the availability of drilling equipment and the timing of production; tax consequences of business transactions; and other risks, assumptions and uncertainties detailed from time to time in ARP’s reports filed with the U.S. Securities and Exchange Commission, including quarterly reports on Form 10-Q, reports on Form 8-K and annual reports on Form 10-K. Forward-looking statements speak only as of the date hereof, and ARP assumes no obligation to update such statements, except as may be required by applicable law.

Copyright Business Wire 2010

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