QuickLinks -- Click here to rapidly navigate through this document

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K

ý    Current report pursuant to Section 13 or 15(d) of the Securities and ExchangeAct of 1934.

November 15, 2002
Date of Report
(Date of earliest event reported)

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

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

707 Seventeenth Street, Suite 3300
Denver, Colorado 80202
(Address of principal executive offices)

Telephone Number (303) 295-3995)
(Registrant's telephone number)

Not applicable
(Former name and address)


ITEM 5. OTHER EVENTS

        On November 15, 2002, Cimarex Energy Co. (NYSE XEC) announced financial and operating results for the third quarter and first nine months of 2002. A copy of the press release is attached hereto as Exhibit 99.1.


ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS

C.
Exhibits

Exhibit No.
  Description

99.1   Press Release


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.


 

 

CIMAREX ENERGY CO.

Dated: November 15, 2002

 

By:

 

/s/  
PAUL KORUS      
Paul Korus
Chief Financial Officer



QuickLinks

SIGNATURES