Item 1.01. Entry into a Material Definitive Agreement.

On January 11, 2013, Atlas Resource Partners, L.P. (the "Partnership") entered into an amendment (the "Fourth Amendment") to its senior secured revolving credit facility (the "Revolving Credit Facility") to revise provisions regarding automatic reduction to the borrowing base if the Partnership issues senior unsecured notes. Pursuant to the Fourth Amendment, the borrowing base will be automatically reduced by an amount equal to:

• with respect to an aggregate stated principal amount of senior unsecured notes up to $300,000,000 issued on or prior to March 31, 2013, the product of 0.15 multiplied by the stated principal amount of such senior notes (without regard to any initial issue discount); and

• with respect to all other issuances of senior notes, the product of 0.25 multiplied by the stated principal amount of such senior notes (without regard to any initial issue discount).

This summary of the Fourth Amendment does not purport to be complete and is qualified in its entirety by reference to the agreement, a copy of which is attached hereto as Exhibit 10.1.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

10.1 Fourth Amendment to Amended and Restated Credit Agreement dated as of January 11, 2013

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