UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K/A

Amendment No. 1

(Mark one)

For the fiscal year ended December 31, 2013

OR

For the transition period from                       to                     

Commission File Number: 001-12209

RANGE RESOURCES CORPORATION

(Exact Name of Registrant as Specified in Its Charter)

(817) 870-2601

Registrant’s telephone number, including area code

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act (check one):

Indicate by check mark whether the registrant is a shell company (as defined in 12b-2 of the Act).    Yes  ¨    No  x

The aggregate market value of the voting and non-voting common equity held by non-affiliates as of June 30, 2013 was $12,297,478,000. This amount is based on the closing price of registrant’s common stock on the New York Stock Exchange on that date. Shares of common stock held by executive officers and directors of the registrant are not included in the computation. However, the registrant has made no determination that such individuals are “affiliates” within the meaning of Rule 405 of the Securities Act of 1933.

As of February 24, 2014, there were 163,687,012 shares of Range Resources Corporation Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s proxy statement to be furnished to stockholders in connection with its 2014 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates, are incorporated by reference in Part III, Items 10-14 of this report.

EXPLANATORY NOTE

We filed our Annual Report on Form 10-K for the year ended December 31, 2013 on February 26, 2014 (the “Original Report”). We are filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) solely to revise Exhibit 99.2 to the Original Report as follows:

In the Original Report, the exhibit 99.2 omitted the specific qualifications of the technical person responsible for overseeing the reserve audit. The exhibits in this Amendment include such information.

No other changes to the Original Report are included in this Amendment other than to provide currently dated consents of the engineering firms and certifications of our principal executive officer and principal financial officer.

This Amendment is being filed in response to comments we received from the staff of the Division of Corporation Finance of the Securities and Exchange Commission (the “SEC”) in connection with the staff’s review of the Original Report. We have made no attempt in this Amendment to modify or update the disclosures presented in the Original Report other than as noted above. Also, this Amendment does not reflect events occurring after the filing of the Original Report. Accordingly, this Amendment should be read in conjunction with the Original Report and our other filings with the SEC subsequent to the filing of the Original Report.

PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) The following exhibits are filed as part of this report:

The interactive data files of our financial statements and accompanying notes were provided as exhibits to our Annual Report on Form 10-K that was filed on February 26, 2014. Because no amendments have been made to such financial information, the interactive data files are not provided in the Form 10-K/A.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities and Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf of the undersigned, thereunto duly authorized.

Date: June 23, 2014

INDEX TO EXHIBITS