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



                DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED)
- -------------------------------------------------------------------------------
                      NOVEMBER 18, 2004 (NOVEMBER 17, 2004)


                          CHESAPEAKE ENERGY CORPORATION
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             (Exact name of Registrant as specified in its Charter)


         OKLAHOMA                       1-13726                 73-1395733
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(State or other jurisdiction      (Commission File No.)       (IRS Employer
      of incorporation)                                     Identification No.)


 6100 NORTH WESTERN AVENUE, OKLAHOMA CITY, OKLAHOMA                 73118
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     (Address of principal executive offices)                     (Zip Code)


                                 (405) 848-8000
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              (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 (see General Instruction A.2. below):

[_] Written communications pursuant to Rule 425 under the Securities Act
    (17 CFR 230.1425)

[_] Soliciting  material  pursuant to Rule 14a-12 under the Exchange Act
    (17 CFR 240.14a-12)

[_] Pre-commencement communications pursuant to Rule 14d-2(b) under the
    Exchange Act (17 CFR 240.14d-2(b))

[_] Pre-commencement communications pursuant to Rule 13e-4(c) under the
    Exchange Act (17 CFR 240.13e-4(c))

SECTION 2 - FINANCIAL INFORMATION ITEM 2.03 - CREATION OF A DIRECT FINANCIAL OBLIGATION OR AN OBLIGATION UNDER AN OFF-BALANCE SHEET ARRANGEMENT OF A REGISTRANT On November 17, 2004, we amended our revolving bank credit facility to increase the aggregate commitments under the facility from $500 million to $600 million and extended the current margin applicable to our interest rates and commitment fees through December 31, 2005. The amendments to the credit facility are attached hereto as exhibits. 2

SECTION 9 - FINANCIAL STATEMENTS AND EXHIBITS ITEM 9.01 - FINANCIAL STATEMENTS AND EXHIBITS EXHIBIT NO. DOCUMENT DESCRIPTION - ----------- -------------------- 99.1 Amendment for an Increased Commitment dated November 17, 2004 to Fourth Amended and Restated Credit Agreement among Chesapeake Energy Corporation, Chesapeake Exploration Limited Partnership, as Borrower, Union Bank of California, N.A. as Administrative Agent and Collateral Agent, BNP Paribas and SunTrust Bank, as Co-Syndication Agents, Calyon New York Branch and Comerica Bank as Co-Documentation Agents, Bank of Scotland and Bank of America, N.A. as Co-Agents and the several lenders from time to time parties thereto. 99.2 First Amendment dated November 17, 2004 to Fourth Amended and Restated Credit Agreement among Chesapeake Energy Corporation, Chesapeake Exploration Limited Partnership, as Borrower, Union Bank of California, N.A. as Administrative Agent and Collateral Agent, BNP Paribas and SunTrust Bank, as Co-Syndication Agents, Calyon New York Branch and Comerica Bank as Co-Documentation Agents, Bank of Scotland and Bank of America, N.A. as Co-Agents and the several lenders from time to time parties thereto. 3

SIGNATURE 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. CHESAPEAKE ENERGY CORPORATION By: /s/ AUBREY K. MCCLENDON --------------------------------------- Aubrey K. McClendon Chairman of the Board and Chief Executive Officer Dated: November 18, 2004 4

EXHIBIT INDEX EXHIBIT NO. DOCUMENT DESCRIPTION 99.1 Amendment for an Increased Commitment dated November 17, 2004 to Fourth Amended and Restated Credit Agreement among Chesapeake Energy Corporation, Chesapeake Exploration Limited Partnership, as Borrower, Union Bank of California, N.A. as Administrative Agent and Collateral Agent, BNP Paribas and SunTrust Bank, as Co-Syndication Agents, Calyon New York Branch and Comerica Bank as Co-Documentation Agents, Bank of Scotland and Bank of America, N.A. as Co-Agents and the several lenders from time to time parties thereto. 99.2 First Amendment dated November 17, 2004 to Fourth Amended and Restated Credit Agreement among Chesapeake Energy Corporation, Chesapeake Exploration Limited Partnership, as Borrower, Union Bank of California, N.A. as Administrative Agent and Collateral Agent, BNP Paribas and SunTrust Bank, as Co-Syndication Agents, Calyon New York Branch and Comerica Bank as Co-Documentation Agents, Bank of Scotland and Bank of America, N.A. as Co-Agents and the several lenders from time to time parties thereto. 5

                                                                    EXHIBIT 99.1
                                                                    ------------


                      AMENDMENT FOR AN INCREASED COMMITMENT


         This  AMENDMENT  is made as of the  17th day of  November,  2004 by and
among  Chesapeake   Exploration   Limited   Partnership,   an  Oklahoma  limited
partnership ("BORROWER"), Chesapeake Energy Corporation, an Oklahoma corporation
(the "COMPANY"),  Union Bank of California,  N.A., as  administrative  agent and
collateral  agent  ("ADMINISTRATIVE  AGENT"),  and  the  Lenders  listed  on the
attached EXHIBIT A (each a "SUPPLEMENTAL LENDER", and together the "SUPPLEMENTAL
LENDERS").

         Borrower, the Company,  Administrative Agent and certain other Lenders,
as described  therein,  are parties to that certain  Fourth Amended and Restated
Credit Agreement dated as of May 7, 2004 (as amended, supplemented, or restated,
the "CREDIT  AGREEMENT").  All terms used herein and not otherwise defined shall
have the same meaning given to them in the Credit Agreement.

         Pursuant to SECTION  10.6A of the Credit  Agreement,  Borrower  has the
right to increase the aggregate  Revolving  Commitment  by obtaining  additional
Revolving  Commitments upon satisfaction of certain  conditions.  This Amendment
requires  only  the  signature  of  Borrower,   Administrative   Agent  and  the
Supplemental  Lenders so long as the Aggregate Commitment is not increased above
the amount permitted by the Credit Agreement.

         The  Supplemental  Lenders are each either (a) an existing Lender which
is increasing  its  Revolving  Commitment or (b) a new Lender which is a lending
institution  whose identity  Administrative  Agent will approve by its signature
below.

         In consideration of the foregoing,  each Supplemental  Lender, from and
after the date hereof,  shall have the Revolving  Commitment  listed next to its
name on the  attached  EXHIBIT  A,  which  shall  replace  the  prior  Revolving
Commitment of each existing  Supplemental  Lender in effect immediately prior to
this  Amendment,  as listed next to its name on the attached  EXHIBIT A, and any
Supplemental  Lender that is a new Lender  hereby  assumes all of the rights and
obligations of a Lender under the Credit  Agreement.  This  Amendment  shall not
affect the Revolving Commitments of Lenders who are not Supplemental Lenders.

         Borrower has executed and delivered to each  Supplemental  Lender as of
the date hereof, if requested by such Supplemental  Lender, a new or replacement
Note in the form  attached to the Credit  Agreement as EXHIBIT H to evidence the
new or increased Revolving Commitment of such Supplemental Lender.


      [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK. SIGNATURE PAGES FOLLOW.]

IN WITNESS WHEREOF, Administrative Agent, Borrower and the Supplemental Lenders have executed this Amendment as of the date shown above. CHESAPEAKE EXPLORATION LIMITED PARTNERSHIP By: Chesapeake Operating, Inc., its general partner By: /S/ MARTHA A. BURGER ----------------------------------- Name: Martha A. Burger Title: Treasurer and Sr. Vice President Human Resources CHESAPEAKE ENERGY CORPORATION By: /S/ MARTHA A. BURGER ----------------------------------- Name: Martha A. Burger Title: Treasurer and Sr. Vice President Human Resources UNION BANK OF CALIFORNIA, N.A., as Administrative Agent By: /S/ RANDALL OSTERBERG ----------------------------------- Name: Randall Osterberg Title: Senior Vice President By: /S/ KIMBERLY CALL ----------------------------------- Name: Kimberly Call Title: Assistant Vice President SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 2

BNP PARIBAS By: /S/ DAVID DODD ----------------------------------- Name: David Dodd Title: Director By: /S/ POLLY SCHOTT ----------------------------------- Name: Polly Schott Title: Vice-President SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 3

SUNTRUST BANK By: /S/ JOE MCCREERY ----------------------------------- Name: Joe McCreery Title: Vice President SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 4

CALYON NEW YORK BRANCH By: /S/ OLIVIER AUDEMARD ----------------------------------- Name: Olivier Audemard Title: Managing Director By: /S/ ATTILA COACH ----------------------------------- Name: Attila Coach Title: Managing Director SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 5

BANK OF SCOTLAND By: /S/ AMENA NABI ----------------------------------- Name: Amena Nabi Title: Assistant Vice President SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 6

COMERICA BANK By: /S/ PETER L. SEFZIK ----------------------------------- Name: Peter L. Sefzik Title: Vice President Texas Division SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 7

BANK OF AMERICA, N.A. By: /S/ RONALD E. MCKAIG ----------------------------------- Name: Ronald E. McKaig Title: Senior Vice President SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 8

WELLS FARGO BANK, N.A. By: /S/ DUSTIN S. HANSEN ----------------------------------- Name: Dustin S. Hansen Title: Assistant Vice President SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 9

NANTEXIS BANQUE POPULAIRE By: /S/ DONOVAN C. BROUSSARD ----------------------------------- Name: Donovan C. Broussard Title: Vice President & Manager By: /S/ LOUIS P. LAVILLE, III ----------------------------------- Name: Louis P. Laville, III Title: Vice President & Manager SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 10

RZB FINANCE LLC By: /S/ JUAN M. CSILLAGI ----------------------------------- Name: Juan M. Csillagi Title: Group Vice President By: /S/ CHRISTOPH HOEDL ----------------------------------- Name: Christoph Hoedl Title: Vice President SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 11

ROYAL BANK OF CANADA By: /S/ LINDA M. STEPHENS ----------------------------------- Name: Linda M. Stephens Title: Authorized Signatory SIGNATURE PAGE TO AMENDMENT FOR COMMITMENT INCREASE 12

EXHIBIT A --------- Prior New Revolving Revolving Commitment Commitment --------------------- ------------------ UNION BANK OF CALIFORNIA, N.A. $45,000,000 $55,000,000 BNP PARIBAS $40,000,000 $50,000,000 SUNTRUST BANK $40,000,000 $50,000,000 CALYON NEW YORK BRANCH $40,000,000 $50,000,000 BANK OF SCOTLAND $40,000,000 $50,000,000 COMERICA BANK $40,000,000 $50,000,000 BANK OF AMERICA, N.A. $40,000,000 $50,000,000 WELLS FARGO BANK, N.A. $25,000,000 $35,000,000 NATEXIS BANQUE $20,000,000 $25,000,000 RZB FINANCE LLC $10,000,000 $15,000,000 ROYAL BANK OF CANADA -0- $10,000,000 --------------------- ------------------- --------------------- ------------------- Increase in Aggregate Revolving Commitment $100,000,000 13

                                                                    EXHIBIT 99.2
                                                                    ------------


                                 FIRST AMENDMENT
                                       TO
                  FOURTH AMENDED AND RESTATED CREDIT AGREEMENT


         THIS FIRST  AMENDMENT TO FOURTH AMENDED AND RESTATED  CREDIT  AGREEMENT
(herein called this "AMENDMENT") is dated as of November 17, 2004 (but effective
on the Effective  Date,  defined  below in Section 3.1) by and among  Chesapeake
Exploration Limited Partnership,  an Oklahoma limited partnership  ("BORROWER"),
Chesapeake Energy Corporation,  an Oklahoma corporation ("COMPANY"),  Union Bank
of   California,   N.A.,   as   administrative   agent  and   collateral   agent
("ADMINISTRATIVE AGENT"), and the several banks and other financial institutions
or entities party hereto ("LENDERS").

                              W I T N E S S E T H:

         WHEREAS,  Borrower,  Company,  Administrative Agent and Lenders entered
into that certain Fourth Amended and Restated  Credit  Agreement dated as of May
7, 2004 (as amended, supplemented, or restated to the date hereof, the "ORIGINAL
AGREEMENT"),  for the  purpose  and  consideration  therein  expressed,  whereby
Lenders became obligated to make loans to Borrower as therein provided; and

         WHEREAS, Borrower, Company,  Administrative Agent and Lenders desire to
amend the Original Agreement as set forth herein;

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants and  agreements  contained  herein and in the Original  Agreement,  in
consideration  of the loans which may  hereafter be made by Lenders to Borrower,
and for other good and valuable  consideration,  the receipt and  sufficiency of
which are hereby acknowledged, the parties hereto do hereby agree as follows:

                                   ARTICLE I.

                           DEFINITIONS AND REFERENCES
                           --------------------------

         Section  1.1.  TERMS  DEFINED  IN THE  ORIGINAL  AGREEMENT.  Unless the
context otherwise  requires or unless otherwise  expressly  defined herein,  the
terms defined in the Original  Agreement  shall have the same meanings  whenever
used in this Amendment.

         Section  1.2.  OTHER  DEFINED  TERMS.   Unless  the  context  otherwise
requires,  the  following  terms  when  used in this  Amendment  shall  have the
meanings assigned to them in this Section 1.2.

                  "AMENDMENT"  means this First  Amendment to Fourth Amended and
        Restated Credit Agreement.

                  "CREDIT  AGREEMENT"  means the  Original  Agreement as amended
        hereby.

                  "EFFECTIVE DATE" has the meaning given to such term in SECTION



ARTICLE II. AMENDMENTS ---------- Section 2.1. DEFINED TERMS. (a) The proviso at the end of the definition of "Applicable Margin" in SECTION 1.1 of the Original Agreement is hereby amended in its entirety to read as follows: "PROVIDED, that, prior to January 1, 2006, the Applicable Margin with respect to each Type of Revolving Loan will be set based on Level III." (b) The proviso at the end of the definition of "Commitment Fee Rate" in SECTION 1.1 of the Original Agreement is hereby amended in its entirety to read as follows: "PROVIDED, that, prior to January 1, 2006, the Commitment Fee Rate will be set based on Level III." ARTICLE III. CONDITIONS OF EFFECTIVENESS; CLOSING ------------------------------------ Section 3.1. EFFECTIVE DATE. This Amendment shall become effective on the date when all of the following conditions precedent have been satisfied (the "EFFECTIVE DATE"). (a) Administrative Agent shall have received, at Administrative Agent's office, duly executed and delivered and in form and substance satisfactory to Administrative Agent, all of the following: (i) this Amendment duly executed by Borrower, Company and Administrative Agent and each Lender; (ii) the Consent Agreement attached hereto duly executed by all Subsidiary Guarantors; (iii) a favorable opinion of Commercial Law Group, counsel for the Company, Borrower and the Subsidiary Guarantors, substantially in the form set forth in EXHIBIT F of the Original Agreement; (iv) an "Omnibus Certificate" of the Secretary of the general partner of Borrower, which shall contain the names and signatures of the officers of the general partner of Borrower authorized to execute Loan Documents and which shall certify to the truth, correctness and completeness of the following exhibits attached thereto: (1) a copy of resolutions attached thereto duly adopted by the Board of Directors of the general partner of Borrower and in full force and effect at the time this Amendment is entered into, authorizing the execution of this Amendment and the other Loan Documents delivered or to be delivered in connection herewith and the consummation of the transactions contemplated herein and therein, (2) a copy of the charter documents of Borrower and of the general partner of Borrower and all amendments thereto, certified by the appropriate official of the Borrower's state and general partner's state of organization, and (3) a copy of any bylaws of the general partner of Borrower previously delivered to Agent and Lenders in connection with the Original Agreement (which may, with respect to any such charter documents or bylaws, reference documents previously delivered in connection with the Original Agreement); (v) a "Compliance Certificate" of the Treasurer of the Company, which shall contain (1) a certification by such officer as to the satisfaction of the conditions set out in subsections (a), (b), and (c) of SECTION 5.2 of the Original Agreement and (2) the calculations required to determine the Senior Debt Limit (along with the supporting documentation described in SECTION 5.2(C) of the Original Agreement); (vi) one or more certificates certifying documents similar to those specified in subsection (iv) of this Section with respect to each Subsidiary Guarantor (which may, with respect to charter documents or bylaws, reference documents previously delivered in connection with the Original Agreement); and (vii) such other supporting documents as Administrative Agent may reasonably request. 2

ARTICLE IV. REPRESENTATIONS AND WARRANTIES ------------------------------ Section 4.1. REPRESENTATIONS AND WARRANTIES OF BORROWER. In order to induce each Lender to enter into this Amendment, Borrower represents and warrants to each Lender that: (a) The representations and warranties contained in SECTION 4 of the Original Agreement are true and correct at and as of the time of the effectiveness hereof, except to the extent that the facts on which such representations and warranties are based have been changed by the extension of credit under the Credit Agreement. (b) The Company and Borrower are duly authorized to execute and deliver this Amendment and are and will continue to be duly authorized to borrow monies and to perform their respective obligations under the Credit Agreement. The Company and Borrower have duly taken all corporate or partnership action necessary to authorize the execution and delivery of this Amendment and to authorize the performance of the obligations of the Company and Borrower hereunder. (c) The execution and delivery by the Company and Borrower of this Amendment, the performance by the Company and Borrower of its obligations hereunder and the consummation of the transactions contemplated hereby do not and will not conflict with any provision of law, statute, rule or regulation or of the certificate of incorporation, bylaws, or agreement of limited partnership of the Company or Borrower (as applicable), or of any material agreement, judgment, license, order or permit applicable to or binding upon the Company or Borrower, or result in the creation of any lien, charge or encumbrance upon any assets or properties of the Company or Borrower. Except for those which have been obtained, no consent, approval, authorization or order of any court or governmental authority or third party is required in connection with the execution and delivery by the Company and Borrower of this Amendment or to consummate the transactions contemplated hereby. (d) When duly executed and delivered, each of this Amendment and the Credit Agreement will be a legal and binding obligation of the Company and Borrower, enforceable in accordance with its terms, except as limited by bankruptcy, insolvency or similar laws of general application relating to the enforcement of creditors' rights and by equitable principles of general application. (e) The audited annual consolidated financial statements of the Company dated as of December 31, 2003 and the unaudited quarterly consolidated financial statements of the Company dated as of September 30, 2004 fairly present the consolidated financial position at such dates and the consolidated statement of operations and the changes in consolidated financial position for the periods ending on such dates for the Company. Copies of such financial statements have heretofore been delivered to each Lender. Since such dates no material adverse change has occurred in the financial condition or businesses or in the consolidated financial condition or businesses of the Company. 3

ARTICLE V. MISCELLANEOUS ------------- Section 5.1. RATIFICATION OF AGREEMENTS. The Original Agreement as hereby amended is hereby ratified and confirmed in all respects. Any reference to the Credit Agreement in any Loan Document shall be deemed to be a reference to the Original Agreement as hereby amended. The execution, delivery and effectiveness of this Amendment shall not, except as expressly provided herein, operate as a waiver of any right, power or remedy of Lenders under the Credit Agreement, the Notes, or any other Loan Document nor constitute a waiver of any provision of the Credit Agreement, the Notes or any other Loan Document. Section 5.2. SURVIVAL OF AGREEMENTS. All representations, warranties, covenants and agreements of Borrower herein shall survive the execution and delivery of this Amendment and the performance hereof, including without limitation the making or granting of the Loans, and shall further survive until all of the Obligations are paid in full. All statements and agreements contained in any certificate or instrument delivered by the Company, Borrower or any Subsidiary Guarantor hereunder or under the Credit Agreement to any Lender shall be deemed to constitute representations and warranties by, and/or agreements and covenants of, such Loan Party under this Amendment and under the Credit Agreement. Section 5.3. LOAN DOCUMENTS. This Amendment is a Loan Document, and all provisions in the Credit Agreement pertaining to Loan Documents apply hereto. Section 5.4. GOVERNING LAW. This Amendment shall be governed by and construed in accordance with the laws of the State of Texas and any applicable laws of the United States of America in all respects, including construction, validity and performance. Section 5.5. COUNTERPARTS; FAX. This Amendment may be separately executed in counterparts and by the different parties hereto in separate counterparts, each of which when so executed shall be deemed to constitute one and the same Amendment. This Amendment may be validly executed by facsimile or other electronic transmission. 4

THIS AMENDMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS OF THE PARTIES. [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK. SIGNATURE PAGES FOLLOW.] 5

IN WITNESS WHEREOF, this Amendment is executed as of the date first above written. CHESAPEAKE EXPLORATION LIMITED PARTNERSHIP By: Chesapeake Operating, Inc., its general partner By: /S/ MARTHA A. BURGER -------------------------------- Name: Martha A. Burger Title: Treasurer and Sr. Vice President Human Resources CHESAPEAKE ENERGY CORPORATION By: /S/ MARTHA A. BURGER -------------------------------- Name: Martha A. Burger Title: Treasurer and Sr. Vice President Human Resources Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 6

UNION BANK OF CALIFORNIA, N.A. Administrative Agent, Collateral Agent, Issuing Lender and Lender By: /S/ RANDALL OSTERBERG -------------------------------- Name: Randall Osterberg Title: Senior Vice President By: /S/ KIMBERLY CALL -------------------------------- Name: Kimberly Call Title: Assistant Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 7

First Amendment to Fourth Amended and Restated Credit Agreement CONSENT AND AGREEMENT By its execution below, each Guarantor hereby (i) consents to the provisions of this Amendment and the transactions contemplated herein, (ii) ratifies and confirms the Second Amended and Restated Guarantee Agreement dated as of May 7, 2004 made by it for the benefit of Administrative Agent and Lenders (as modified by certain Assumption Agreements) and the other Loan Documents executed pursuant to the Credit Agreement (or any prior amendment or supplement to the Credit Agreement), (iii) agrees that all of its respective obligations and covenants thereunder shall remain unimpaired by the execution and delivery of this Amendment and the other documents and instruments executed in connection herewith, and (iv) agrees that the Second Amended and Restated Guarantee Agreement and such other Loan Documents shall remain in full force and effect. CHESAPEAKE ENERGY CORPORATION By: /S/ MARTHA A. BURGER -------------------------------- Martha A. Burger Treasurer and Senior Vice President - Human Resources CHESAPEAKE OPERATING, INC. By: /S/ MARTHA A. BURGER -------------------------------- Martha A. Burger Treasurer and Senior Vice President - Human Resources Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 8

CHESAPEAKE SOUTH TEXAS CORP. CHESAPEAKE ENERGY LOUISIANA CORPORATION NOMAC DRILLING CORPORATION OXLEY PETROLEUM CO. CHESAPEAKE PRH CORP. CHESAPEAKE ENERGY MARKETING, INC. CHESAPEAKE BNR CORP. By: /S/ MARTHA A. BURGER -------------------------------- Martha A. Burger, Treasurer, on behalf of each of the foregoing corporations CARMEN ACQUISITION, L.L.C. CHESAPEAKE ACQUISITION, L.L.C. CHESAPEAKE ENO ACQUISITION, L.L.C. CHESAPEAKE FOCUS, L.L.C. CHESAPEAKE KNAN ACQUISITION, L.L.C. CHESAPEAKE MOUNTAIN FRONT, L.L.C. CHESAPEAKE ORC, L.L.C. CHESAPEAKE ROYALTY, L.L.C. CHESAPEAKE EP, L.L.C. GOTHIC PRODUCTION, L.L.C. MC MINERAL COMPANY, L.L.C. SAP ACQUISITION, L.L.C. JOHN C. OXLEY, L.L.C. CHESAPEAKE PERMIAN ACQUISITION, L.L.C. MAYFIELD PROCESSING, LLC By: /S/ MARTHA A. BURGER -------------------------------- Martha A. Burger, Treasurer, on behalf of each of the forgoing limited liability companies 9

CHESAPEAKE LOUISIANA, L.P. CHESAPEAKE SIGMA, L.P. CHESAPEAKE PERMIAN, L.P. CHESAPEAKE ZAPATA, L.P. Chesapeake-Staghorn Acquisition, L.P. CHESAPEAKE NFW, L.P. CHESAPEAKE LNG, L.P. By: Chesapeake Operating, Inc., as General Partner on behalf of each of the foregoing limited partnerships By: /S/ MARTHA A. BURGER -------------------------------- Martha A. Burger, Treasurer and Senior Vice President - Human Resources MIDCON COMPRESSION, L.P. By: Chesapeake Energy Marketing, Inc., as General Partner By: /S/ MARTHA A. BURGER -------------------------------- Martha A. Burger Treasurer Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 10

ARVEST BANK By: /S/ CINDY BATT -------------------------------- Name: Cindy Bat Title: Sr. Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 11

BANK OF AMERICA, N.A. By: /S/ RONALD E. MCKAIG -------------------------------- Name: Ronald E. McKaig Title: Senior Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 12

BANK OF OKLAHOMA By: /S/ MARK MORRIS -------------------------------- Name: Mark Morris Title: Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 13

BANK OF SCOTLAND By: /S/ AMENA NABI -------------------------------- Name: Amena Nabi Title: Assistant Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 14

BNP PARIBAS By: /S/ DAVID DODD --------------------------------- Name: David Dodd Title: Director By: /S/ POLLY SCHOTT -------------------------------- Name: Polly Schott Title: Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 15

COMERICA BANK By: /S/ PETER L. SEFZIK -------------------------------- Name: Peter L. Sefzik Title: Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 16

COMPASS BANK By: /S/ KATHLEEN J. BOWEN -------------------------------- Name: Kathleen J. Bowen Title: Senior Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 17

CALYON NEW YORK BRANCH By: /S/ OLIVER AUDEMAND -------------------------------- Name: Oliver Audemand Title: Managing Director By: /S/ ATTILA COACH -------------------------------- Name: Attila Coach Title: Managing Director Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 18

CREDIT SUISSE FIRST BOSTON, acting through its Cayman Islands Branch By: /S/ PAUL L. COLON -------------------------------- Name: Paul L. Colon Title: Director By: /S/ VANESSA GOMEZ -------------------------------- Name: Vanessa Gomez Title: Associate Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 19

DEUTSCHE BANK TRUST COMPANY AMERICAS By: S/S MARCUS M. TARKINGTON -------------------------------- Name: Marcus M. Tarkington Title: Director Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 20

J. ARON & COMPANY By: S/S PETER O'HAGAN -------------------------------- Name: Peter O'Hagan Title: Managing Director Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 21

NATEXIS BANQUES POPULAIRES By: S/S DONOVAN C. BROUSSARD -------------------------------- Name: Donovan C. Broussard Title: Vice President & Manager By: /S/ TIMOTHY L. POLVADO -------------------------------- Name: Timothy L. Polvado Title: Vice President & Manager Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 22

PNC BANK By: /S/ JOHN WATTINGER -------------------------------- Name: John Wattinger Title: Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 23

RZB FINANCE LLC By: /S/ JUAN M. CSILLAGI -------------------------------- Name: Juan M. Csillagi Title: Group Vice President By: /S/ CHRISTOPH HOEDL -------------------------------- Name: Christoph Hoedl Title: Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 24

SUNTRUST BANK By: /S/ JOE MCCREERY -------------------------------- Name: Joe McCreery Title: Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 25

TORONTO DOMINION (TEXAS), INC. By: /S/ NEVA NEXBITT -------------------------------- Name: Neva Nexbitt Title: Authorized Agent Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 26

UBS LOAN FINANCE LLC By: /S/ WILFRED V. SAINT -------------------------------- Name: Wilfred V. Saint Title: Director Banking Products Services US By: /S/ JOSALIN FERNANDES -------------------------------- Name: Josalin Fernandes Title: Associate Director Banking Products Services US Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 27

WELLS FARGO BANK, N.A. By: /S/ DUSTIN S. HANSEN -------------------------------- Name: Dustin S. Hansen Title: Assistant Vice President Signature Page to First Amendment to Fourth Amended and Restated Credit Agreement 28