Item 9.01. Financial Statements and Exhibits

(a) Financial Statements of Businesses Acquired.

• DTE Gas Resources, LLC unaudited balance sheets as of September 30, 2012 and December 31, 2011, statements of operations, equity and cash flows for the nine months ended September 30, 2012 and 2011, and notes to the financial statements are filed as Exhibit 99.1 to this Current Report on Form 8-K/A and are incorporated by reference herein.

• DTE Gas Resources, LLC audited balance sheet as of December 31, 2011, statements of operations, equity and cash flows and notes to the financial statements for the year ended December 31, 2011, together with independent auditors' report thereon, are filed as Exhibit 99.2 to this Current Report on Form 8-K/A and are incorporated by reference herein.

(b) Pro Forma Financial Information

The unaudited pro forma consolidated combined balance sheet of ARP as of September 30, 2012, and the related pro forma consolidated combined statements of operations for the nine months ended September 30, 2012 and the year ended December 31, 2011 are filed as Exhibit 99.3 to this Current Report on Form 8-K/A and are incorporated by reference herein.

(d) Exhibits

23.1 Consent of Grant Thornton, LLP

99.1 DTE Gas Resources, LLC unaudited balance sheets as of September 30, 2012 and December 31, 2011, statements of operations, equity and cash flows for the nine months ended September 30, 2012 and 2011, and notes to the financial statements

99.2 DTE Gas Resources, LLC audited balance sheet as of December 31, 2011, statements of operations, equity and cash flows for the year ended December 31, 2011 and notes to the financial statements

99.3 Unaudited pro forma consolidated combined financial statements

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