SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT

   Pursuant to Section 13 or 15(d) of the Securities and Exchange Act of 1934.

                                December 21, 2007
                                 Date of Report


                               CIMAREX ENERGY CO.
             (Exact name of registrant as specified in its charter)


            Delaware                      001-31446              45-0466694
(State or other jurisdiction       (Commission File Number)   (I.R.S. Employer
        of incorporation)                                    Identification No.)


1700 Lincoln Street, Suite 1800, Denver, Colorado                     80203-4518
--------------------------------------------------------------------------------
         (Address of principal executive offices)                     (Zip Code)

Registrant's telephone number, including area code           303-295-3995
                                                  ------------------------------


         (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:

|_| Written communications pursuant to Rule 425 under the Securities Act

|_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act

|_| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
Act

|_| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
Act



ITEM 7.01 REGULATION FD DISCLOSURE

December 21, 2007, Cimarex Energy Co. (NYSE: XEC) issued a press release. A copy
of the news release is furnished as Exhibit 99.1 to this report.

ITEM 9.01 FINANCIAL STATEMENTS AND EXHIBITS

(d)   Exhibits

Exhibit No.                       Description

99.1        Press Release is furnished pursuant to Item 7.01.



                                   SIGATURES


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.


                                      CIMAREX ENERGY CO.


Dated:   December 21, 2007            By: /s/ Paul Korus
                                          --------------------------------------
                                          Paul Korus, Vice President,
                                          Chief Financial Officer and Treasurer



EXHIBIT INDEX

Exhibit No.                       Description
-----------                       -----------

99.1        Press Release