SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 11-K

                 ANNUAL REPORT PURSUANT TO SECTION 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

(Mark One)

[ X ]    ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT
         OF 1934
         (FEE REQUIRED)

         For the fiscal year ended December 31, 2003

                                       Or

[   ]    TRANSITION REPORT PURSUANT TO SECTION 15(D) OF THE SECURITIES EXCHANGE
         ACT OF 1934
         (No Fee Required)

         For the transition period from
                                        ----------------  to  -----------------

         Commission File No. 1-13726


         A. Full  title of the plan and the  address of the plan,  if  different
from that of the issuer named below:

               CHESAPEAKE ENERGY CORPORATION SAVINGS AND INCENTIVE
                                STOCK BONUS PLAN
                            6100 NORTH WESTERN AVENUE
                             OKLAHOMA CITY, OK 73118

         B. Name of issuer of the  securities  held pursuant to the plan and the
address of its principal executive office:

                          CHESAPEAKE ENERGY CORPORATION
                            6100 NORTH WESTERN AVENUE
                             OKLAHOMA CITY, OK 73118



CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULES
December 31, 2003 and 2002



CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Contents
December 31, 2003 and 2002
--------------------------------------------------------------------------------


                                                                           PAGE

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM.......................1

FINANCIAL STATEMENTS

Statements of Net Assets Available for Benefits...............................2

Statements of Changes in Net Assets Available for Benefits....................3

Notes to Financial Statements.................................................4

SUPPLEMENTAL SCHEDULES

Schedule of Assets (Held at End of Year).....................................10

Schedule of Reportable Transactions..........................................11




             REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the  Participants  and the Members of the Employee  Compensation and Benefits
Committee of the Chesapeake Energy Corporation Savings and Incentive Stock Bonus
Plan


In our opinion the accompanying  statements of net assets available for benefits
and the  related  statements  of changes in net assets  available  for  benefits
present fairly, in all material respects,  the net assets available for benefits
of the Chesapeake Energy Corporation Savings and Incentive Stock Bonus Plan (the
"Plan") at December 31, 2003 and 2002,  and the changes in net assets  available
for benefits for the years then ended, in conformity with accounting  principles
generally accepted in the United States of America.  These financial  statements
are the  responsibility  of the  Plan's  management.  Our  responsibility  is to
express  an  opinion  on these  financial  statements  based on our  audits.  We
conducted our audits of these statements in accordance with the standards of the
Public Company  Accounting  Oversight  Board (United  States).  Those  standards
require that we plan and perform the audit to obtain reasonable  assurance about
whether the financial  statements  are free of material  misstatement.  An audit
includes  examining,  on a test  basis,  evidence  supporting  the  amounts  and
disclosures in the financial  statements,  assessing the  accounting  principles
used and  significant  estimates made by management,  and evaluating the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for our opinion.

Our audits  were  conducted  for the  purpose of forming an opinion on the basic
financial  statements  taken as a whole.  The  supplemental  schedules of Assets
(Held at End of Year) and Reportable  Transactions are presented for the purpose
of  additional  analysis  and are not a  required  part of the  basic  financial
statements  but are  supplementary  information  required by the  Department  of
Labor's Rules and  Regulations  for Reporting and Disclosure  under the Employee
Retirement  Income Security Act of 1974.  These  supplemental  schedules are the
responsibility of the Plan's  management.  The supplemental  schedules have been
subjected  to the  auditing  procedures  applied  in  the  audits  of the  basic
financial  statements  and, in our  opinion,  are fairly  stated in all material
respects in relation to the basic financial statements taken as a whole.



PricewaterhouseCoopers LLP

June 25, 2004
Oklahoma City, Oklahoma


                                        1




CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Statements of Net Assets Available for Benefits
December 31, 2003 and 2002
--------------------------------------------------------------------------------


                                                     2003            2002
Assets
Investments                                    $ 53,858,347     $ 28,010,785
Receivables
    Employer contributions                           54,230           84,673
    Participants' contributions                     131,785           85,053
    Dividends                                        98,622           72,339
                                               --------------   ---------------
       Total assets                              54,142,984       28,252,850
                                               --------------   ---------------

Liabilities
Accrued liabilities                                  18,780           28,794
                                               ---------------   --------------
        Net assets available for benefits       $ 54,124,204     $ 28,224,056
                                              ================  ===============









































  The accompanying notes are an integral part of these financial statements.

                                        2



CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Statements of Changes in Net Assets Available for Benefits
Years Ended December 31, 2003 and 2002
-------------------------------------------------------------------------------

                                                      2003           2002

ADDITIONS TO NET ASSETS ATTRIBUTED TO
Investment income
Interest and dividends                          $    588,381     $    293,691
Net appreciation in fair value of investments     18,439,319        1,572,008
                                                --------------   --------------
Total investment income                           19,027,700        1,865,699
                                                --------------   --------------
Contributions
Employer                                           3,929,615        2,876,857
Participants                                       4,446,710        3,507,850
                                                --------------   --------------
Total contributions                                8,376,325        6,384,707
                                                -------------    --------------
Total additions                                   27,404,025        8,250,406
                                                -------------    --------------
DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO
Benefits paid to participants                      1,444,781          693,203
Administrative expenses                               59,096           54,235
                                                --------------   --------------
Total deductions                                   1,503,877          747,438
                                                --------------   --------------
Net increase                                      25,900,148        7,502,968

NET ASSETS AVAILABLE FOR BENEFITS
Beginning of year                                 28,224,056        20,721,088
                                                --------------   --------------
                                                $ 54,124,204     $  28,224,056
                                                ==============   ==============
































  The accompanying notes are an integral part of these financial statements.

                                        3


CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Notes to Financial Statements
December 31, 2003 and 2002
--------------------------------------------------------------------------------


1. DESCRIPTION OF THE PLAN

         The  following  is a brief  summary of the  various  provisions  of the
         Chesapeake  Energy  Corporation  Savings and Incentive Stock Bonus Plan
         (the  "Plan").  Participants  should refer to the Plan  agreement for a
         complete description of the Plan's provisions.

         GENERAL
         The Plan is a defined  contribution  plan that covers all  employees of
         Chesapeake  Energy  Corporation and its  subsidiaries  (the "Company"),
         except for the employees of NOMAC Drilling Corporation,  a wholly-owned
         subsidiary.

         CONTRIBUTIONS
         Each  year,  participants  may  contribute  up to 15 percent of pre-tax
         annual  compensation,  as  defined by the Plan.  Participants  may also
         contribute  amounts  representing  rollover  distributions  from  other
         qualified  plans.  The  Company  makes  matching  contributions  of 100
         percent of the first 15 percent of  participant  contributions.  Profit
         sharing  contributions  may be made at the  discretion of the Company's
         board of directors.  No discretionary profit sharing contributions were
         made  in  2003  and  2002.   Contributions   are   subject  to  certain
         limitations.

         The  Company's  matching  contribution  is used to  purchase  shares of
         Chesapeake Energy  Corporation Common Stock (the "Common Stock") on the
         open market.  Participants may also elect to direct all or a portion of
         their  contributions  into  the  Common  Stock.  Participants  may  not
         transfer or liquidate  their  investment  in Common Stock  arising from
         employer  contributions  and  earnings  thereon  until  they  elect  to
         withdraw  from  the  Plan  due to  separation  of  service  or elect an
         in-service distribution upon attainment of age 59 1/2.

         PARTICIPANT ACCOUNTS
         Each   participant's   account  is  credited  with  the   participant's
         contribution  and  allocations of the Company's  contribution  and Plan
         earnings.  Allocations  are based on  participant  earnings  or account
         balances, as defined. The benefit to which a participant is entitled is
         the benefit that can be provided from the participant's  vested account
         balance.

         VESTING
         Participants are immediately vested in their  contributions plus actual
         earnings thereon.  Vesting in the Company's matching and profit sharing
         contributions  plus  actual  earnings  thereon  is  based  on  years of
         credited  service  or  participant's   age.  Prior  to  July  1,  2003,
         participants  received  benefits  based  on  a  vesting  schedule  that
         provided  for 100  percent  vesting  upon  completion  of six  years of
         credited  service.  Effective  July 1, 2003, a participant  will be 100
         percent vested after five years of credited service.

                                        4


CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Notes to Financial Statements
December 31, 2003 and 2002
--------------------------------------------------------------------------------


         PARTICIPANT NOTES RECEIVABLE
         Participants may borrow from their accounts a minimum of $1,000 up to a
         maximum  equal to the lesser of  $50,000 or 50 percent of their  vested
         account  balance.  Loan terms range from one to five years or up to ten
         years  for  the  purchase  of  a  primary  residence.   The  loans  are
         collateralized  by the  balance in the  participant's  account and bear
         interest at the Prime  Interest  Rate.  Principal  and interest is paid
         ratably  through  semi-monthly  payroll  deductions.  Interest rates on
         loans outstanding at December 31, 2003 ranged from 4.00 percent to 9.50
         percent.

         PAYMENT OF BENEFITS
         Upon termination of service due to death, retirement or separation from
         service,  a participant  may elect to receive either a lump-sum  amount
         equal to the value of the  participant's  vested interest in his or her
         account, annual installments,  or have the value rolled over to another
         qualified plan or IRA. Those participants who were Plan participants as
         of  December  31,  1999 may elect to  receive  benefits  in the form of
         annuity payments.

         AMOUNTS FORFEITED
         Forfeited  nonvested  amounts  are  first  used  to pay  administrative
         expenses  of the Plan or to restore  unvested  amounts  to  re-employed
         participants.  Any  remaining  forfeitures  are used to reduce  Company
         contributions  into the  Plan.  Forfeited  nonvested  accounts  totaled
         $100,489  and  $155,929  at December  31, 2003 and 2002,  respectively.
         During 2003  forfeited  nonvested  accounts of $63,008 were used to pay
         administrative  expenses  of the plan and  $75,000  to reduce  employer
         matching contributions.


2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

         BASIS OF ACCOUNTING
         The  financial  statements  of the Plan are prepared  under the accrual
         method of accounting.

         USE OF ESTIMATES
         The  preparation of financial  statements in conformity  with generally
         accepted  accounting  principles  requires management to make estimates
         and  assumptions  that  affect  the  reported  amounts  of  net  assets
         available for benefits at the date of the financial  statements and the
         changes in net  assets  available  for  benefits  during the  reporting
         period. Actual results could differ from those estimates.

         INVESTMENT VALUATION AND INCOME RECOGNITION
         The Plan's investments are stated at fair value. Shares of mutual funds
         are  valued at quoted  market  prices on the last  business  day of the
         year.  Chesapeake  Energy  Corporation  common  stock is  valued at the
         closing market price on the last business day of the year, according to
         the New York Stock Exchange. Participant loans receivable are valued at
         outstanding principal balance, which approximates fair value.

         Purchases and sales of securities  are recorded on a trade-date  basis.
         Investment  income is  recorded  on the accrual  basis.  Dividends  are
         recorded on the ex-dividend date.


                                        5


CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Notes to Financial Statements
December 31, 2003 and 2002
-------------------------------------------------------------------------------


         The Plan presents,  in the statement of changes in net assets available
         for benefits, the net appreciation  (depreciation) in the fair value of
         investments  which  consists  of the  realized  gains or losses and the
         unrealized appreciation (depreciation) on those investments.

         PAYMENT OF BENEFITS
         Benefits are recorded when paid.

         RISKS AND UNCERTAINTIES
         Investment  securities are exposed to various  risks,  such as interest
         rate, market, and credit risk. Due to the level of risk associated with
         certain investment securities,  it is at least reasonably possible that
         changes in value of investment  securities  will occur in the near term
         and that such changes could  materially  affect  participants'  account
         balances  and the  amounts  reported  in the  statement  of net  assets
         available  for  benefits  and the  statement  of  changes in net assets
         available for benefits.

         RECLASSIFICATIONS
         Certain reclassification adjustments have been made in the December 31,
         2002  statement of net assets  available for benefits to conform to the
         current year presentation.

3.       INVESTMENTS
         The following  presents  investments  that  represented five percent or
         more of the Plan's net assets:




                                                             2003              2002
                                                                     

         Chesapeake Energy Corporation Common Stock    $ 38,265,445  *    $ 18,663,410 *
         Fidelity Retirement Money Market Fund            1,961,837 **       2,008,864


          *  Balances   include   nonparticipant-directed   investments.

         **  Amount represents less than five percent of net assets at December
            31, 2003, and is presented for comparative purposes only.

         The  Plan's  investments  (including  gains and  losses on  investments
         bought  and  sold,  as  well  as  held  during  the  year)  appreciated
         (depreciated) in value as follows:

                                                     2003              2002

         Mutual funds                           $  2,600,468      $ (1,238,182)
         Common stocks                            15,838,851         2,810,190
                                                --------------    --------------
                                                $ 18,439,319      $  1,572,008
                                                ==============    ==============


                                        6


CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Notes to Financial Statements
December 31, 2003 and 2002
-------------------------------------------------------------------------------


4. NONPARTICIPANT-DIRECTED INVESTMENTS

         Investment in the Chesapeake Energy  Corporation  common stock includes
         balances  arising  from   nonparticipant-directed   employer   matching
         contributions,  as  well  as  participant-directed   contributions  and
         transfers  from other  investment  options.  Information  about the net
         assets  and the  significant  components  of the  changes in net assets
         relating to  investments in the Chesapeake  Energy  Corporation  common
         stock is as follows:




                                                               2003                 2002

         NET ASSETS
                                                                         
         Chesapeake Energy Corporation common stock      $  38,265,445         $  18,663,410
                                                         ---------------       ----------------

         CHANGES IN NET ASSETS
         Contributions                                   $   4,605,462         $   3,350,369
         Dividend income                                       339,572                36,850
         Net appreciation                                   15,838,851             2,810,190
         Benefits paid to participants                        (980,729)             (372,741)
         Transfers to other investment options, net           (201,121)             (227,859)
                                                         ---------------        ---------------
                                                         $  19,602,035         $   5,596,809
                                                         ===============       ================


5. PARTY-IN-INTEREST TRANSACTIONS

         Certain Plan  investments are shares of Chesapeake  Energy  Corporation
         common stock. These transactions  represent investments in the Company,
         and, therefore,  qualify as  party-in-interest  transactions.  Further,
         certain Plan investments are shares of mutual funds managed by Fidelity
         Investments.  Fidelity  Management  Trust  Company  is the  trustee  as
         defined  by the Plan,  and,  therefore,  transactions  in mutual  funds
         managed  by   Fidelity   Investments   qualify   as   party-in-interest
         transactions.


6. TAX STATUS

         The Plan obtained its latest determination letter on April 22, 1997, in
         which the  Internal  Revenue  Service  stated  that the  Plan,  as then
         designed,  was in compliance  with the applicable  requirements  of the
         Internal  Revenue  Code (the "IRC").  The Plan has been  amended  since
         receiving the determination letter. However, the plan administrator and
         the plan's tax counsel believe the Plan is currently designed and being
         operated in compliance  with the  applicable  requirements  of the IRC.
         Therefore,  no  provision  for income  taxes has been  included  in the
         plan's financial statements.


                                        7


CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Notes to Financial Statements
December 31, 2003 and 2002
-------------------------------------------------------------------------------


7. PLAN TERMINATION

         Although the Company has not expressed any intent to do so, the Company
         reserves  the right to  change,  amend or  discontinue  the Plan at any
         time,   subject  to  the   provisions   of  ERISA.   In  the  event  of
         discontinuance of the Plan, participants will become 100 percent vested
         in their accounts.


8. CONCENTRATION OF INVESTMENTS

         As of December 31, 2003 net assets available for benefits in the amount
         of  $38,265,445  and  $14,316,827  were invested in  Chesapeake  Energy
         Common  Stock  and  mutual  funds  managed  by  Fidelity   Investments,
         respectively.


9. RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500

         The following is a reconciliation  of net assets available for benefits
         as of December  31, 2003 and 2002,  as  reflected  in the  accompanying
         financial statements, to the Form 5500:




                                                                                   2003                  2002
                                                                                              
         Net assets available for benefits per the financial statements      $  54,124,204         $   28,224,056
         Add:  Accrued administrative expenses                                      18,780                 28,794
         Less:  Accrued dividend income                                                  -                (72,339)
                                                                             ----------------      ----------------
         Net assets available for benefits per the Form 5500                 $  54,142,984         $   28,180,511
                                                                             ================      ================


         The following is a reconciliation  of  administrative  expenses for the
         years  ended   December  31,  2003  and  2002,   as  reflected  in  the
         accompanying financial statements, to the Form 5500:



                                                                                   2003                  2002
                                                                                             
        Administrative expenses per the financial statements                 $      59,096         $       54,235
        Add:   Previous year accrued administrative expenses                        28,794                 27,319
        Less:  Current year accrued administrative expenses                        (18,780)               (28,794)
                                                                             ----------------      ----------------
        Administrative expenses per the Form 5500                            $      69,110         $       52,760
                                                                             ================      ================


         Administrative expenses are recorded on the Form 5500 when paid.

                                       8



         The following is a  reconciliation  of interest and dividend income for
         the  year  ended  December  31,  2003 and  2002,  as  reflected  on the
         accompanying financial statements, to the form 5500:


                                                                                   2003               2002

                                                                                                  
         Interest and dividends per the financial statements                $     588,381         $       293,691
         Add:  Previous year accrued interest and dividend income                  72,339                      -
         Less:  Current year accrued interest and dividend income                       -                 (72,339)
                                                                             ----------------      ----------------
         Interest and dividends per the Form 5500                           $     660,720         $       221,352
                                                                             ================      ================



         Prior to January 1, 2003 dividend income was recorded on the Form 5500
         when  paid. Effective January 1, 2003 dividend  income was recorded on
         the Form 5500 on the accrual basis of accounting.

                                        9


CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Schedule of Assets (Held at End of Year)
December 31, 2003                                                    Schedule 1
-------------------------------------------------------------------------------



                                                DESCRIPTION OF INVESTMENT
                                                 INCLUDING MATURITY DATE
        IDENTITY OF ISSUE, BORROWER,           RATE OF INTEREST, COLLATERAL,                            CURRENT
         LESSOR, OR SIMILAR PARTY                 PAR, OR MATURITY VALUE              COST               VALUE

                                                                                            
*   Chesapeake Energy Corporation                      Common Stock                 $14,147,749      $  38,265,445
*   Fidelity Equity Inc.                               Mutual Funds                    **                  912,473
*   Fidelity Growth Co.                                Mutual Funds                    **                1,374,788
*   Fidelity Inter Bond                                Mutual Funds                    **                  291,768
*   Fidelity OTC Portfolio                             Mutual Funds                    **                  525,858
*   Fidelity Low Priced Stock Fund                     Mutual Funds                    **                2,175,546
*   Fidelity Aggressive Growth                         Mutual Funds                    **                1,137,226
*   Fidelity Diversified International
    Fund                                               Mutual Funds                    **                1,336,879
*   Fidelity Freedom Income                            Mutual Funds                    **                  108,918
*   Fidelity Freedom 2000                              Mutual Funds                    **                  118,732
*   Fidelity Freedom 2010                              Mutual Funds                    **                  932,876
*   Fidelity Freedom 2020                              Mutual Funds                    **                  824,289
*   Fidelity Freedom 2030                              Mutual Funds                    **                  415,546
*   Fidelity Freedom 2040                              Mutual Funds                    **                   37,879
*   Fidelity Retirement Money Market                   Mutual Funds                    **                1,961,837
*   Spartan US Equity Index                            Mutual Funds                    **                1,863,641
    Brokeragelink participant-directed          Common Stocks & Mutual Funds            **
         brokerage accounts                                                                                336,355
    Alger Small Cap Institutional                      Mutual Funds                    **                  177,039
    Templeton Foreign A                                Mutual Funds                    **                  141,602
    Lord Abbett Mid Cap Value                          Mutual Funds                    **                   81,108
*   Participant Loans                           Interest Rates Ranging From            **                  838,542
                                                4.00 percent to 9.50 percent
                                                                                                    --------------
                                                                                                    $   53,858,347
                                                                                                    ==============


 *  Identifies parties-in-interest

**  Identifies participant-directed investment options for which presentation of
    cost in the Schedule of Assets (Held at End of Year) is not required.


                                        10



CHESAPEAKE ENERGY CORPORATION
SAVINGS AND INCENTIVE STOCK BONUS PLAN
Schedule of Reportable Transactions
Year Ended December 31, 2003                                         SCHEDULE 2
--------------------------------------------------------------------------------




                                                                         TOTAL           TOTAL
                                       NUMBER OF        NUMBER OF       PURCHASE        SELLING        NET GAIN
       DESCRIPTION OF ASSET            PURCHASES          SALES          PRICE           PRICE          (LOSS)
                                                                                      
*Chesapeake Energy Corporation
 Stock Purchases                           33                 -      $ 4,303,570      $       -      $       -
                                           --                 -      ===========      ==========     ==========



* Identifies parties-in-interest

                                       11

                                   SIGNATURES

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



                                        CHESAPEAKE ENERGY CORPORATION
                                        Savings and Incentive Stock Bonus Plan




                                  By:   /s/ MARY WHITSON
                                        ---------------------------------------
                                        Mary Whitson, Plan Administrator


Date:  June 28, 2004



                                       12


 EXHIBIT INDEX


Exhibit                                  Description
-------                                  -----------

23     Consent of PricewaterhouseCoopers LLP

                                       13