UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 21, 2014

EXCO RESOURCES, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (214) 368-2084

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Section 1 – Registrant’s Business and Operations

Item 1.01 Entry into a Material Definitive Agreement.

On October 21, 2014, EXCO Resources, Inc. (“EXCO”) entered into that certain Third Amendment to its Amended and Restated Credit Agreement by and among EXCO, as borrower, certain of its subsidiaries, as guarantors, JPMorgan Chase Bank, N.A., as administrative agent, and the lenders party thereto (the “Third Amendment”).

The Third Amendment amended EXCO’s existing Amended and Restated Credit Agreement, dated as of July 31, 2013, as amended (the “Amended and Restated Credit Agreement”), to, among other things, increase the amount of the borrowing base under the Amended and Restated Credit Agreement from $875.0 million to $900.0 million. The increased borrowing base is subject to adjustment pursuant to the terms of the Amended and Restated Credit Agreement. The Third Amendment was entered into following the regular semi-annual redetermination of the borrowing base under the Amended and Restated Credit Agreement.

The foregoing description of the Third Amendment does not purport to be complete and is qualified in its entirety by reference to the Third Amendment, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated by reference herein.

On October 22, 2014, EXCO issued a press release announcing the increase of the borrowing base under the Amended and Restated Credit Agreement. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated by reference herein.

Section 2 – Financial Information

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth in Item 1.01 of this Current Report on Form 8-K is incorporated by reference into this Item 2.03.

2

Section 9 – Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

3

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

4

EXHIBIT INDEX

5