Atlas Resource Partners, L.P. Announces Pricing of 5.5M Share Public Offering of Common Units at $21.18

Atlas Resource Partners, L.P. ARP announced today that it has priced an underwritten public offering of 5,500,000 common units representing limited partner interests at an offering price of $21.18. Wells Fargo Securities, Citigroup, Deutsche Bank Securities, 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 825,000 common units. The net proceeds of the offering, assuming no exercise of the over-allotment option, after underwriting discounts and estimated expenses, are approximately $112.1 million. ARP intends to use the net proceeds from this offering to fund its previously-announced acquisition of natural gas assets from GeoMet, Inc. and its subsidiaries. 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 common units are being offered pursuant to an automatic shelf registration statement that ARP previously filed with the SEC. The offering is being made only by means of a prospectus supplement and accompanying prospectus. Copies of the prospectus and accompanying prospectus supplement relating to these securities may be obtained by contacting: Wells Fargo Securities Attn: Equity Syndicate Department 375 Park Avenue New York, NY 10152 Phone: (800) 326-5897 Email: cmclientsupport@wellsfargo.com Citigroup c/o Broadridge Financial Solutions 1155 Long Island Avenue Edgewood, NY 11717 1-800-831-9146 batprospectusdept@citi.com Deutsche Bank Securities Inc. Attn: Prospectus Department Harborside Financial Center 100 Plaza One Jersey City, New Jersey 07311 Telephone: (800) 503-4611 J.P. Morgan C/o Broadridge Financial Solutions 1155 Long Island Avenue Edgewood, NY 11717 Phone: 866-803-9204 Morgan Stanley Attn: Prospectus Dept. 180 Varick Street, 2nd Floor New York, NY 10014 RBC Capital Markets Attn: Prospectus Department 3 World Financial Center 200 Vesey Street, 8th Floor New York, New York 10281-8098 Phone: (877) 822-4089 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. Atlas Resource Partners, L.P. ARP is an exploration & production master limited partnership which owns an interest in over 13,000 producing natural gas and oil wells, located primarily in Appalachia, the Barnett Shale (TX), the Raton Basin (NM) and Black Warrior Basin (AL). ARP is also the largest sponsor of natural gas and oil investment partnerships in the U.S. Atlas Energy, L.P. ATLS is a master limited partnership which owns all of the general partner Class A units and incentive distribution rights and an approximate 37% 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 6% limited partner interest. Cautionary Note Regarding Forward-Looking Statements This press release 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 proposed GeoMet acquisition, on the terms described or at all; ARP's ability to obtain required consents in order to permit the transfer of the assets included in the proposed GeoMet acquisition; ARP's ability to obtain the required financing for the proposed GeoMet acquisition, on desirable terms or at all; the ability to obtain required regulatory approvals for the proposed GeoMet acquisition; ARP's ability to realize the anticipated benefits of the proposed GeoMet 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.