CHESAPEAKE ENERGY CORP
424B3, 1998-12-09
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1

PROSPECTUS SUPPLEMENT
TO PROSPECTUS DATED AUGUST 3, 1998
AS SUPPLEMENTED TO DATE

                                                Filed Pursuant to rule 424(b)(3)
                                                Registration No. 333-57235


                          CHESAPEAKE ENERGY CORPORATION
                               4,600,000 SHARES OF
                    7% CUMULATIVE CONVERTIBLE PREFERRED STOCK
                                       AND
           33,093,525 SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION


         This Prospectus Supplement relates to the resale by the Selling
Shareholders named below of shares of 7% Cumulative Convertible Preferred Stock,
par value $.01 and liquidation preference $50 per share ("Preferred Stock"), of
Chesapeake Energy Corporation, an Oklahoma corporation (the "Company"),
originally issued in private placements consummated on April 22, 1998. This
Supplement should be read in conjunction with the Prospectus dated August 3,
1998, as supplemented to date (the "Prospectus"), to be delivered with this
Supplement. All capitalized terms used but not defined in this Supplement have
the meanings given to them in the Prospectus.

         Based on information provided to the Company, the following table
supplements information provided in the Prospectus regarding the number of
Shares beneficially owned by Selling Shareholders.

<TABLE>
<CAPTION>


                                                                  PREFERRED STOCK                       COMMON STOCK 
                                                            -------------------------------    -----------------------------------
                                                            NUMBER OF    PERCENT OF SHARES      NUMBER OF        PERCENT OF SHARES
NAME OF SELLING SHAREHOLDER                                 SHARES(1)     OUTSTANDING(2)       SHARES(1)(3)        OUTSTANDING(4)
- ---------------------------                                 ---------    -----------------     ------------      -----------------
<S>                                                         <C>          <C>                   <C>                <C>
Credit Suisse First Boston
  Corporation ....................................            10,000            *                 71,942                 *
Mega Life and Health Insurance ...................             3,000            *                 21,582                 *

</TABLE>

- ----------
*        Less than 1%.

(1)      Represents the number of shares offered hereby.

(2)      Based upon 4,600,000 shares of Preferred Stock outstanding.

(3)      Assumes conversion into full shares of Common Stock of the full amount
         of Preferred Stock held by each holder at the initial rate of $6.95 of
         liquidation preference per share.

(4)      Based on 96,710,450 shares of Common Stock outstanding as of November
         30, 1998, treating as outstanding the number of shares shown as being
         issuable upon the assumed conversion by the named holder of the full
         amount of such holder's Preferred Stock, but not assuming the
         conversion of the Preferred Stock of any other holder.

         The closing prices of the Common Stock and the Preferred Stock, as
reported on the New York Stock Exchange on December 8, 1998, were $1.25 and
$18.50 per share, respectively.

         Selling Shareholders selling their Shares under the Prospectus should
complete the Resale Certificate attached hereto as Exhibit A and deliver it to
the Company as directed.



           THE DATE OF THIS PROSPECTUS SUPPLEMENT IS DECEMBER 9, 1998.



<PAGE>   2



                                                                       EXHIBIT A

                               RESALE CERTIFICATE

                          CHESAPEAKE ENERGY CORPORATION
                    7% CUMULATIVE CONVERTIBLE PREFERRED STOCK

         This Resale Certificate is delivered to Chesapeake Energy Corporation
(the "Company") in connection with its Registration Statement on Form S-3 (No.
333-57235) registering the resale of the Company's 7% Cumulative Convertible
Preferred Stock (the "Preferred Stock") and Common Stock issuable upon
conversion. In order to transfer a position in the unregistered Preferred Stock
(CUSIP No. 165167 20 6) to a position in the registered Preferred Stock (CUSIP
No. 165167 30 5) after a sale of Preferred Stock covered by the Prospectus
(defined below) included in the Registration Statement, this Certificate must be
completed in full and telecopied or otherwise delivered immediately after the
sale to Janice A. Dobbs, Chesapeake Energy Corporation, 6100 North Western
Avenue, Oklahoma City, Oklahoma 73118; FAX (405) 879-9572; Telephone (405)
879-9212.

         1.   Name of Seller (as it appears in the Prospectus)

              ------------------------------------------------------------------

              Seller's DTC Participant Number

              ---------------------------------------

         2.   The undersigned hereby confirms that on ____________, 199__ it 
sold ____ shares (the "Shares") of Preferred Stock to the purchaser (the 
"Purchaser") named below.

              Name of Purchaser

              ------------------------------------------------------------------

              Purchaser's DTC Participant Number

              ---------------------------------------

         3.   The undersigned hereby confirms that it delivered a copy of the 
Company's Prospectus dated August 3, 1998 and the Prospectus Supplements dated
August 27, October 5 and December 9, 1998 attached thereto (the "Prospectus") at
the time of the sale of the Shares. The undersigned hereby requests that, in
reliance on the representations made herein, the Company transfer the Shares
from the Seller's position in the unregistered Preferred Stock (CUSIP No. 165167
20 6) to an identical position of the Purchaser in the registered Preferred
Stock (CUSIP No. 165167 30 5). 


                             Name of Seller or authorized signatory for Seller:


                             --------------------------------------------------

                             By:
                                -----------------------------------------------

Date:                        Print Name:
     ----------------------             ---------------------------------------

                             Title:
                                   --------------------------------------------

                             Medallion Signature Guarantee:

Approved by
CHESAPEAKE ENERGY CORPORATION

By:
   ------------------------------
Date:
     ----------------------------


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