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

                           Whiting Petroleum Corporation                          

(Exact name of registrant as specified in its charter)

            1700 Broadway, Suite 2300, Denver, Colorado 80290-2300            

(Address of principal executive offices, including ZIP code)

                               (303) 837-1661                              

(Registrant’s telephone number, including area code)

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:

On December 8, 2014, Whiting Petroleum Corporation (“Whiting”) acquired Kodiak Oil & Gas Corp. (n/k/a Whiting Canadian Holding Company ULC, “Whiting Canadian Holding”). As a result of such acquisition, Whiting, Whiting Canadian Holding, Whiting Resources Corporation (f/k/a Kodiak Oil & Gas (USA) Inc., “Whiting Resources”), Whiting US Holding Company, a wholly owned subsidiary of Whiting (“Whiting Holdco”), and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”), entered into the Supplemental Indentures and Amendment – Subsidiary Guarantee, each dated as of December 11, 2014 (the “Supplemental Indentures”) to each of the (i) Senior Indenture, dated as of September 12, 2013 (the “Senior Indenture”), as supplemented and amended by the First Supplemental Indenture, dated as of September 12, 2013, among Whiting, Whiting Oil and Gas Corporation (“WOGC”) and the Trustee (the “First Supplemental Indenture”), (ii) Senior Indenture, as supplemented and amended by the Second Supplemental Indenture, dated as of September 12, 2013, among Whiting, WOGC and the Trustee (the “Second Supplemental Indenture”), and (iii) Subordinated Indenture, dated as of April 19, 2005, as supplemented and amended by the Second Supplemental Indenture, dated as of September 24, 2010, among Whiting, WOGC and the Trustee (the “Subordinated Indenture”).

Pursuant to the Supplemental Indentures, Whiting Canadian Holding, Whiting Resources and Whiting Holdco, effective as of the date of the Supplemental Indentures, agreed to guarantee the payment obligations of the notes issued under each of the First Supplemental Indenture, the Second Supplemental Indenture and the Subordinated Indenture.

The foregoing description of the Supplemental Indentures does not purport to be complete and is qualified in its entirety by reference to the Supplemental Indentures, copies of which are filed as Exhibit 4.1, 4.2 and 4.3 to this Current Report on Form 8-K and are incorporated herein by reference.

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SIGNATURES

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

FORM 8-K

EXHIBIT INDEX

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