CHESAPEAKE ENERGY CORP
SC 13D/A, 1999-12-17
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                                (Amendment No. 2)

                    Under the Securities Exchange Act of 1934

                          CHESAPEAKE ENERGY CORPORATION
                          -----------------------------
                                (Name of Issuer)

                          Common Stock, par value $.01
                          ----------------------------
                         (Title of Class of Securities)

                                  165167 10 7
                                 --------------
                                 (CUSIP Number)

                              Shannon Self, Esquire
                           Self, Giddens & Lees, Inc.
                               2725 Oklahoma Tower
                                 210 Park Avenue
                          Oklahoma City, Oklahoma 73102
                                 (405) 232-3001
                                 --------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                December 2, 1999
                                ----------------
             (Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box. [ ]

NOTE: Six (6) copies of this statement, including all exhibits, should be filed
with the Commission. See Rule 13d-1(a) for other parties to whom copies are to
be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


                               Page 1 of 12 Pages
<PAGE>   2

CUSIP NO. 16517 10 7

<TABLE>
<S>        <C>                                                                                  <C>
   (1)     Names of Reporting Persons, S.S. or I.R.S. Identification Nos.                       Aubrey K. McClendon
           of Above Persons                                                                             ###-##-####
   (2)     Check the Appropriate Box if a Member of a Group (See                                           (a)  [x]
           Instructions)                                                                                   (b)  [ ]
   (3)     SEC Use Only
   (4)     Source of Funds (See Instructions)                                                                    OO
   (5)     Check if Disclosure of Legal Proceedings  is Required Pursuant                                       [ ]
           to Items 2(d) or 2(e)
   (6)     Citizenship or Place of Organization                                                                 USA
   Number of Shares  (7) Sole Voting Power                                                                9,575,276
   Beneficially      (8) Shared Voting Power                                                                508,560
   Owned By Each     (9) Sole Disposition                                                                 9,575,276
   Reporting Person (10) Shared Dispositive Power                                                           508,560
   With:
  (11)     Aggregate Amount Beneficially Owned by Each Reporting Person                                  10,083,836
  (12)     Check if the Aggregate Amount in Row (11) Excludes Certain                                           [ ]
           Shares (See Instructions)
  (13)     Percent of Class Represented by Amount in Row (11)                                                 10.62%
  (14)     Type of Reporting Person (See Instructions)                                                           IN
</TABLE>

                               Page 2 of 12 Pages
<PAGE>   3

CUSIP NO. 16517 10 7

<TABLE>
<S>        <C>                                                                         <C>
   (1)     Names of Reporting Persons, S.S. or I.R.S. Identification Nos.              Chesapeake Investments, an
           of Above Persons                                                            Oklahoma Limited Partnership
                                                                                                         73-1132104
   (2)     Check the Appropriate Box if a Member of a Group (See                                           (a)  [x]
           Instructions)                                                                                   (b)  [ ]
   (3)     SEC Use Only
   (4)     Source of Funds (See Instructions)                                                                   N/A
   (5)     Check if Disclosure of Legal Proceedings  is Required Pursuant                                       [ ]
           to Items 2(d) or 2(e)
   (6)     Citizenship or Place of Organization                                                            Oklahoma
   Number of Shares  (7) Sole Voting Power                                                                        0
   Beneficially      (8) Shared Voting Power                                                                508,560
   Owned By Each     (9) Sole Disposition                                                                         0
   Reporting Person (10) Shared Dispositive Power                                                           508,560
   With:
  (11)     Aggregate Amount Beneficially Owned by Each Reporting Person                                     508,560
  (12)     Check if the Aggregate Amount in Row (11) Excludes Certain                                           [ ]
           Shares (See Instructions)
  (13)     Percent of Class Represented by Amount in Row (11)                                                   .54%
  (14)     Type of Reporting Person (See Instructions)                                                           PN
</TABLE>


                               Page 3 of 12 Pages

<PAGE>   4

CUSIP NO. 16517 10 7

<TABLE>
<S>        <C>                                                                                          <C>
   (1)     Names of Reporting Persons, S.S. or I.R.S. Identification Nos.                               Tom L. Ward
           of Above Persons                                                                             ###-##-####
   (2)     Check the Appropriate Box if a Member of a Group (See                                           (a)  [x]
           Instructions)                                                                                   (b)  [ ]
   (3)     SEC Use Only
   (4)     Source of Funds (See Instructions)                                                                    OO
   (5)     Check if Disclosure of Legal Proceedings  is Required Pursuant                                       [ ]
           to Items 2(d) or 2(e)
   (6)     Citizenship or Place of Organization                                                                 USA
   Number of Shares       (7) Sole Voting Power                                                           9,519,192
   Beneficially Owned     (8) Shared Voting Power                                                         1,846,860
   By Each Reporting      (9) Sole Disposition                                                            9,519,192
   Person With:          (10) Shared Dispositive Power                                                    1,846,860
  (11)     Aggregate Amount Beneficially Owned by Each Reporting Person                                  11,366,052
  (12)     Check if the Aggregate Amount in Row (11) Excludes Certain                                           [ ]
           Shares (See Instructions)
  (13)     Percent of Class Represented by Amount in Row (11)                                                 11.97%
  (14)     Type of Reporting Person (See Instructions)                                                           IN
</TABLE>


                               Page 4 of 12 Pages
<PAGE>   5

CUSIP NO. 16517 10 7

<TABLE>
<S>        <C>                                                                                 <C>
   (1)     Names of Reporting Persons, S.S. or I.R.S. Identification Nos.                      TLW Investments Inc.
           of Above Persons                                                                              73-1215253
   (2)     Check the Appropriate Box if a Member of a Group (See                                           (a)  [x]
           Instructions)                                                                                   (b)  [ ]
   (3)     SEC Use Only
   (4)     Source of Funds (See Instructions)                                                                   N/A
   (5)     Check if Disclosure of Legal Proceedings  is Required Pursuant                                       [ ]
           to Items 2(d) or 2(e)
   (6)     Citizenship or Place of Organization                                                            Oklahoma
   Number of Shares       (7) Sole Voting Power                                                                   0
   Beneficially Owned     (8) Shared Voting Power                                                         1,846,860
   By Each Reporting      (9) Sole Disposition                                                                    0
   Person With:          (10) Shared Dispositive Power                                                    1,846,860
  (11)     Aggregate Amount Beneficially Owned by Each Reporting Person                                   1,846,860
  (12)     Check if the Aggregate Amount in Row (11) Excludes Certain                                           [ ]
           Shares (See Instructions)
  (13)     Percent of Class Represented by Amount in Row (11)                                                  1.95%
  (14)     Type of Reporting Person (See Instructions)                                                           CO
</TABLE>


                               Page 5 of 12 Pages
<PAGE>   6

CUSIP NO. 16517 10 7

                             Preliminary Statement

This Amendment No. 2 to Schedule 13D amends and restates: (a) the Schedule 13D
dated February 4, 1993, and filed by the group consisting of Aubrey K. McClendon
and Chesapeake Investments, an Oklahoma Limited Partnership ("CI"); (b) the
Schedule 13D dated February 4, 1993, and filed by the group consisting of Tom L.
Ward and TLW Investments Inc. ("TLW"); and (c) Amendment No. 1 to Schedule 13D
filed on March 10, 1997, by the group consisting of Mr. McClendon and CI and the
group consisting Mr. Ward and TLW (collectively, the "Prior Schedule 13D"). Mr.
McClendon, CI, Mr. Ward and TLW are referred to herein as the "Reporting
Persons." The group consisting of Mr. McClendon and CI and the group consisting
of Mr. Ward and TLW each disclaim beneficial ownership of the shares held by the
other group.

Item 1.  Security and Issuer.

         This Schedule 13D relates to the common stock, par value $.01 per share
         (the "Common Stock"), of Chesapeake Energy Corporation, an Oklahoma
         corporation (the "Company") having its principal executive offices at
         6100 North Western Avenue, Oklahoma City, Oklahoma 73118.

Item 2.  Identity and Background.

         (a)-(c)

         Aubrey K. McClendon

         Mr. McClendon is the Chairman of the Board and Chief Executive Officer
         of the Company, having a business address of 6100 North Western Avenue,
         Oklahoma City, Oklahoma 73118. The Company is engaged in oil and gas
         exploration and development.

         Chesapeake Investments

         Chesapeake Investments, an Oklahoma Limited Partnership, is an Oklahoma
         limited partnership, having a business address of 6100 North Western
         Avenue, Oklahoma City, Oklahoma 73118. Mr. McClendon is the sole
         general partner of CI. CI is principally engaged in the ownership of
         working interests in oil and gas wells and leases.

         Tom L. Ward

         Mr. Ward is the President and Chief Operating Officer of the Company,
         having a business address of 6200 North Western Avenue, Oklahoma City,
         Oklahoma 73118.

         TLW Investments Inc.

         TLW Investments Inc., is an Oklahoma corporation having a business
         address of 6200 North Western Avenue, Oklahoma City, Oklahoma 73118.
         Mr. Ward is the sole shareholder,


                               Page 6 of 12 Pages
<PAGE>   7

CUSIP NO. 16517 10 7

         director, and president of TLW. TLW is principally engaged in the
         ownership of working interests in oil and gas wells and leases.

         (d) During the past five (5) years no Reporting Person has been
         convicted in a criminal proceeding (excluding traffic violations or
         similar misdemeanors).

         (e) During the past five (5) years, no Reporting Person has been a
         party to a civil proceeding of a judicial or an administrative body of
         competent jurisdiction as a result of which a Reporting Person is, or
         was, subject to a judgment, decree or final order enjoining future
         violations of, or prohibiting or mandating activity subject to, federal
         or state securities laws or finding any violation with respect to such
         laws.

Item 3.  Source and Amount of Funds or Other Consideration.

         The Reporting Persons acquired more than 5% of the outstanding Common
         Stock of the Company upon the formation and capitalization of the
         Company effective January 1, 1992. As the primary consideration for
         such shares, the Reporting Persons conveyed to the Company certain oil
         and gas properties, stock of various corporations which became
         wholly-owned subsidiaries of the Company, other real property and
         personal property.

         Subsequent to the formation of the Company the Reporting Persons
         acquired shares of the Company's common stock through open market
         purchases and through the exercise of employee stock options issued to
         Mr. McClendon and Mr. Ward under the Company's employee stock option
         plans. Except for open market purchases by Mr. Ward's children of
         21,435 shares of stock (for which Mr. Ward disclaims beneficial
         ownership) no open market purchases have been consummated by the
         Reporting Persons since the filing of the Prior Schedule 13D.

         The investment cost for the previously reported purchases were funded
         using the Reporting Person's own funds and funds borrowed by the
         Reporting Person in transactions previously disclosed in the Prior
         Schedule 13D including, without implied limitation, lending
         arrangements with Morgan Guaranty Trust Company of New York ("Morgan
         Guaranty"), Donaldson, Lufkin & Jenrette and Dain Rauscher, Inc., as
         successor to Rauscher, Pierce & Refnes, Inc. To the extent still
         outstanding, the foregoing loans are secured by a security interest in
         a portion of the shares of stock held by the Reporting Persons.

         A portion of the foregoing indebtedness was refinanced by the Reporting
         Persons. Pursuant to loan agreements dated July 7, 1998, as amended
         from time to time, Mr. McClendon and Mr. Ward each borrowed $5.0
         million from Chesapeake Energy Marketing, Inc. ("CEMI"), an affiliate
         of the Company, with the proceeds applied to the indebtedness at Morgan
         Guaranty. Mr. McClendon's loan from CEMI was secured by various
         collateral including 144,807 shares of the Common Stock. Mr. Ward's
         loan from CEMI was secured by various collateral including 2,350,840
         shares of the Common Stock.


                               Page 7 of 12 Pages

<PAGE>   8

CUSIP NO. 16517 10 7

Item 4.  Purpose of Transaction.

         Mr. McClendon and Mr. Ward acquired the shares of Common Stock for
         investment purposes. In the future, the Reporting Persons may: (i)
         purchase additional shares of Common Stock or (ii) dispose of any or
         all of the Common Stock in any manner permitted by applicable
         securities laws. Mr. McClendon and Mr. Ward are each members of the
         Company's Board of Directors. Other than Mr. McClendon's and Mr. Ward's
         participation on the Board of Directors, none of the Reporting Persons
         has any present plans or intentions relating to the transactions
         described in paragraphs (a) through (j) of Item 4 of Schedule 13D.

Item 5.  Interest in Securities of the Issuer.

         The aggregate percentage of shares of Common Stock reported as
         beneficially owned by each Reporting Person was computed based upon
         94,928,623 shares of Common Stock outstanding on November 30, 1999.
         The number was computed based on the shares reported outstanding by
         the Company as of November 8, 1999, in the most recent 10Q filed by
         the Company on November 15, 1999, adjusted for the transaction
         discussed in Item 5(c).

         (a) The following table sets forth the aggregate number and percentage
         of the class of Common Stock of the Company identified pursuant to Item
         1 beneficially owned by each person named in Item 2:

<TABLE>
<CAPTION>
       Person                          Amount                               Percent
       ------                          ------                               -------
<S>                               <C>                                       <C>
Aubrey K. McClendon               10,083,836 (1)(2)                          10.62%
Chesapeake Investments               508,560 (2)                               .54%
Tom L. Ward                       11,366,052 (3)(4)                          11.97%
TLW Investments                    1,846,860 (4)                              1.95%
</TABLE>

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

(1) This amount includes: (i) 73,583 shares held on behalf of Mr. McClendon in
the Chesapeake Energy Corporation Savings and Incentive Stock Bonus Plan as of
September 30, 1999, the latest date such information is available; and (ii)
722,953 shares which Mr. McClendon has the right to acquire within sixty (60)
days pursuant to stock options granted by the Company.

(2) This amount includes 508,560 shares owned of record by CI, of which Mr.
McClendon is the sole general partner. CI and Mr. McClendon share voting and
dispositive power over such shares.

(3) This amount includes (i) 25,588 shares held on behalf of Mr. Ward in the
Chesapeake Energy Corporation Savings and Incentive Stock Bonus Plan as of
September 30, 1999, the latest date such information is available; (ii) 722,954
shares which Mr. Ward has the right to acquire within sixty (60) days pursuant
to stock options granted by the Company; (iii) 1,098,600 shares held by Mr. Ward
as Trustee of a trust for the benefit of Mr. McClendon's children; and (iv)
21,435 shares held by Mr. Ward in custodial accounts for the benefit of Mr.
Ward's children. Mr. Ward disclaims ownership of the shares held in the
McClendon Children's Trust under (iii) above and the shares held for the benefit
of Mr. Ward's children under (iv) above.

(4) This amount includes 1,846,860 shares owned of record by TLW, of which Mr.
Ward is the sole shareholder, director, and Chief Executive Officer. TLW and Mr.
Ward share voting and dispositive power over such shares.

         (b) The following table sets forth, for each person and entity
         identified under paragraph (a), the number of shares of Common Stock of
         the Company as to which the person has (1) the sole power to vote or
         direct the voting, (2) shared power to vote or direct the voting, (3)
         the sole power to dispose or to direct the disposition, or (4) shared
         power to dispose or to direct the disposition:


                               Page 8 of 12 Pages

<PAGE>   9

CUSIP NO. 16517 10 7

<TABLE>
<CAPTION>
                                           Sole Voting and                      Shared Voting and
   Person or Entity                      Power of Disposition                  Power of Disposition
   ----------------                      --------------------                  --------------------
<S>                                      <C>                                   <C>
Aubrey K. McClendon                          9,575,276 (1)                          508,560 (2)
Chesapeake Investments                               0                              508,560 (2)
Tom L. Ward                                  9,519,192 (3)                        1,846,860 (4)
TLW Investments                                      0                            1,846,860 (4)
</TABLE>

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

(1)  See footnote (1) under paragraph (a) of this Item 5.

(2)  See footnote (2) under paragraph (a) of this Item 5.

(3)  See footnote (3) under paragraph (a) of this Item 5.

(4)  See footnote (4) under paragraph (a) of this Item 5.

         (c) During the sixty days prior to the date of this Schedule 13D, the
         following transactions were effected in the Common Stock by a Reporting
         Person:

         On November 18, 1999, Mr. McClendon satisfied the loan from CEMI by
         transferring to CEMI free and clear of all liens, claims and
         encumbrances 1,184,532 shares of Common Stock. The original principal
         balance of the Mr. McClendon's loan from CEMI was $5.0 million and the
         balance due and owing on the effective date of the foregoing transfer
         of Common Stock was $3,897,109. The sale price of the Common Stock
         transferred to CEMI in the foregoing transaction was $3.29 per share
         which amount was determined by taking the average closing price of the
         Common Stock for the ten trading days prior to the transfer of the
         Common Stock to CEMI. Although the foregoing transaction was closed
         effective November 18, 1999, the transaction was subject to termination
         until the Company's primary lender consented to the transaction, which
         consent was delivered December 2, 1999.

         On November 18, 1999, Mr. Ward satisfied the loan from CEMI by
         transferring to CEMI free and clear of all liens, claims and
         encumbrances 1,135,575 shares of Common Stock. The original principal
         balance of the Mr. Ward's loan from CEMI was $5.0 million and the
         balance due and owing on the effective date of the foregoing transfer
         of Common Stock was $3,736,043. The sale price of the Common Stock
         transferred to CEMI in the foregoing transaction was $3.29 per share
         which amount was determined by taking the average closing price of the
         Common Stock for the ten trading days prior to the transfer of the
         Common Stock to CEMI. Although the foregoing transaction was closed
         effective November 18, 1999, the transaction was subject to termination
         until the Company's primary lender consented to the transaction, which
         consent was delivered December 2, 1999.


                               Page 9 of 12 Pages

<PAGE>   10
CUSIP NO. 16517 10 7

         (d) See Item 6, below.

         (e) Not applicable.

Item 6.  Contracts, Agreements, Underwritings or Relationships With Respect to
Securities of the Issuer.

         Mr. McClendon and Mr. Ward, as officers of the Company, participate in
         the Company's 1992 Incentive Stock Option Plan, 1992 Nonstatutory Stock
         Option Plan, as amended, 1994 Stock Option Plan, 1996 Stock Option Plan
         and 1999 Stock Option Plan.

         Mr. McClendon had three separate lending agreements with Morgan
         Guaranty, dated January 8, February 6, and February 13, 1997. Mr.
         McClendon also maintains lending arrangements with Donaldson, Lufkin &
         Jenrette, pursuant to an agreement dated November 22, 1996 and Dain
         Rauscher, Inc. as successor to Rauscher, Pierce & Refnes, Inc.,
         pursuant to an agreement dated February 25, 1994. A portion of the
         shares of Common Stock owned by Mr. McClendon and CI are pledged as
         collateral for such loans. Each agreement contains standard default and
         remedial provisions.

         Mr. Ward had three separate lending agreements with Morgan Guaranty,
         dated January 8, February 6, and February 13, 1997. Mr. Ward also
         maintains a lending arrangement with Donaldson, Lufkin & Jenrette,
         pursuant to an agreement dated November 22, 1996. A portion of the
         shares of Common Stock owned by Mr. Ward are pledged as collateral for
         such loans. Each agreement contains standard default and remedial
         provisions.

         In connection with loans from Mr. Frederick B. Whittemore: (a) Mr.
         McClendon granted to Mr. Whittemore pursuant to that certain Common
         Stock Purchase Option dated March 10, 1999, an option to purchase
         394,688 shares of Common Stock at a purchase price of $0.50 per share;
         and (b) Mr. Ward granted to Mr. Whittemore an option to purchase
         355,312 shares of Common Stock at a purchase price of $0.50 per share.
         In each case, if on or before February 29, 2000, the borrower pays in
         full or collateralizes Mr. Whittemore's loan the number of shares
         covered by the option attributable to the loan which is paid or
         collateralized automatically decreases by 50%.

         In connection with a loan from Mr. Shannon Self, Mr. McClendon granted
         to Mr. Self pursuant to that certain Common Stock Purchase Option
         dated March 10, 1999, an option to purchase 37,750 shares of Common
         Stock at a purchase price of $0.50 per share. In addition, in
         connection with a loan from Talbot Fairfield II Limited Partnership
         ("Talbot"), Mr. McClendon granted to Talbot pursuant to that certain
         Common Stock Purchase Option dated March 10, 1999, an option to
         purchase 37,750 shares of Common Stock at a purchase price of $0.50
         per share. If on or before February 29, 2000, Mr. McClendon pays in
         full or collateralizes Mr. Self's or Talbot's loan, the number of
         shares covered by the option attributable to the loan which is paid or
         collateralized automatically decreases by 50%.


                              Page 10 of 12 Pages

<PAGE>   11

Item 7.  Materials to be Filed as Exhibits.

1.       Limited Partnership Agreement of Chesapeake Investments, an Oklahoma
         Limited Partnership, is filed as Exhibit E to the Schedule 13D dated
         February 4, 1993 filed by Aubrey K. McClendon and is incorporated
         herein by reference.

2.       The Company's 1992 Incentive Stock Option Plan, as amended, is
         incorporated herein by reference to Exhibit 10.1.1 to the Company's
         Registration Statement on Form S-4, No. 33-93718, filed June 23, 1995.

3.       The Company's 1992 Nonstatutory Stock Option Plan, as amended, is filed
         as Exhibit 10.1.2 to the Company's Quarterly Report on Form 10-Q filed
         February 14, 1997, and is incorporated herein by reference.

4.       The Company's 1994 Stock Option Plan is filed as Exhibit 10.1.3 to the
         Company's Quarterly Report on Form 10-Q filed February 14, 1997, and is
         incorporated herein by reference.

5.       The Company's 1996 Stock Option Plan is filed as Exhibit B to the
         Company's Proxy Statement for its 1996 Annual Meeting of Shareholders
         filed November 6, 1996 and is incorporated herein by reference.

6.       Morgan Guaranty Trust Company of New York Demand Note, dated February
         6, 1997, executed by Aubrey K. McClendon was filed as Exhibit 6 to
         Amendment No. 1 to Schedule 13D filed by the Reporting Persons on March
         10,1997 and is incorporated herein by reference.

7.       Morgan Guaranty Trust Company of New York Demand Note, dated February
         13, 1997 executed by Aubrey K. McClendon was filed as Exhibit 7 to
         Amendment No. 1 to Schedule 13D filed by the Reporting Persons on March
         10,1997 and is incorporated herein by reference.

8.       Morgan Guaranty Trust Company of New York Demand Note, dated February
         6, 1997, executed by Tom L. Ward was filed as Exhibit 8 to Amendment
         No. 1 to Schedule 13D filed by the Reporting Persons on March 10,1997
         and is incorporated herein by reference.

9.       Morgan Guaranty Trust Company of New York Demand Note, dated February
         13, 1997, executed by Tom L. Ward was filed as Exhibit 9 to Amendment
         No. 1 to Schedule 13D filed by the Reporting Persons on March 10,1997
         and is incorporated herein by reference.

10.      The Company's 1999 Stock Option Plan is filed as Exhibit 10.1.5 to the
         Company's Quarterly Report on Form 10-Q filed August 16, 1999, and is
         incorporated herein by reference.

11.      Stock Purchase Agreement dated November 18, 1999, among Aubrey K.
         McClendon, Chesapeake Operating, Inc., and Chesapeake Energy Marketing,
         Inc.


                              Page 11 of 12 Pages

<PAGE>   12

CUSIP NO. 16517 10 7

12.      Stock Purchase Agreement dated November 18, 1999, among Tom L. Ward,
         Chesapeake Operating, Inc., and Chesapeake Energy Marketing, Inc.

13.      Common Stock Purchase Option No. AKM-1 dated March 10, 1999, executed
         by Aubrey K. McClendon in favor of Frederick B. Whittemore.

14.      Common Stock Purchase Option No. TLW-1 dated March 10, 1999, executed
         by Tom L. Ward in favor of Frederick B. Whittemore.

15.      Common Stock Purchase Option No. AKM-2 dated March 10, 1999, executed
         by Aubrey K. McClendon in favor of Shannon Self.

16.      Common Stock Purchase Option No. AKM-3 dated March 10, 1999, executed
         by Aubrey K. McClendon in favor of Talbot Fairfield II Limited
         Partnership.

17.      Joint Filing Agreement.

                                    SIGNATURE

                After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this statement is true,
complete and correct.

DATED:   December 16, 1999.

                                    /s/ Aubrey K. McClendon
                                    -------------------------------------------
                                    AUBREY K. McCLENDON, an individual

                                    CHESAPEAKE INVESTMENTS, an Oklahoma limited
                                    partnership

                                    By: /s/ Aubrey K. McClendon
                                        ---------------------------------------
                                    Aubrey K. McClendon, General Partner


                                    /s/ Tom L. Ward
                                    -------------------------------------------
                                    TOM L. WARD, an individual

                                    TLW INVESTMENTS INC., an Oklahoma
                                    corporation

                                    By: /s/ Tom L. Ward
                                        ---------------------------------------
                                        Tom L. Ward, President


                              Page 12 of 12 Pages

<PAGE>   13

                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
   Exhibit
     No.                           Description                                     Method of Filing
   -------                         -----------                                     ----------------
<S>            <C>                                                 <C>
    99.1       Limited Partnership Agreement of Chesapeake         Incorporated herein by reference to Exhibit E
               Investments, an Oklahoma Limited Partnership        to the Schedule 13D dated February 4, 1993

    99.2       The Company's 1992 Incentive Stock Option Plan,     Incorporated herein by reference to Exhibit
               as amended                                          10.1.1 to the Company's Registration Statement
                                                                   on Form S-4, No. 33-93718, filed June 23, 1995

    99.3       The Company's 1992 Nonstatutory Stock Option        Incorporated herein by reference to Exhibit
               Plan, as amended                                    10.1.2 to the Company's Quarterly Report on
                                                                   Form 10-Q filed February 14, 1997

    99.4       The Company's 1994 Stock Option Plan                Incorporated herein by reference to Exhibit
                                                                   10.1.3 to the Company's Quarterly Report on
                                                                   Form 10-Q filed February 14, 1997

    99.5       The Company's 1996 Stock Option Plan                Incorporated herein by reference to Exhibit B
                                                                   to the Company's Proxy Statement for its 1996
                                                                   Annual Meeting of Shareholders filed November
                                                                   6, 1996

    99.6       Morgan Guaranty Trust Company of New York           Incorporated herein by reference to Exhibit 6
               Demand Note, dated February 6, 1997, executed       to Amendment No. 1 to Schedule 13D filed by the
               by Aubrey K. McClendon                              Reporting Persons on March 10, 1997

    99.7       Morgan Guaranty Trust Company of New York Demand    Incorporated herein by reference to Exhibit 7
               Note, dated February 13, 1997 executed by Aubrey    to Amendment No. 1 to Schedule 13D filed by the
               K. McClendon                                        Reporting Persons on March 10, 1997

    99.8       Morgan Guaranty Trust Company of New York Demand    Incorporated herein by reference to Exhibit 8
               Note, dated February 6, 1997, executed by Tom L.    to Amendment No. 1 to Schedule 13D filed by the
               Ward                                                Reporting Persons on March 10, 1997
</TABLE>

<PAGE>   14

<TABLE>
<S>            <C>                                                 <C>
    99.9       Morgan Guaranty Trust Company of New York Demand    Incorporated herein by reference to Exhibit 9
               Note, dated February 13, 1997, executed by Tom L.   to Amendment No. 1 to Schedule 13D filed by the
               Ward                                                Reporting Persons on March 10,1997

    99.10      The Company's 1999 Stock Option Plan                Incorporated herein by reference to Exhibit
                                                                   10.1.5 to the Company's Quarterly Report on
                                                                   Form 10-Q filed August 16, 1999

    99.11      Stock Purchase Agreement dated November 18, 1999,   Filed herewith electronically
               among Aubrey K. McClendon, Chesapeake Operating,
               Inc., and Chesapeake Energy Marketing, Inc.

    99.12      Stock Purchase Agreement dated November 18, 1999,   Filed herewith electronically
               among Tom L. Ward, Chesapeake Operating, Inc.,
               and Chesapeake Energy Marketing, Inc.

    99.13      Common Stock Purchase Option No. AKM-1 dated        Filed herewith electronically
               March 10, 1999, executed by Aubrey K. McClendon
               in favor of Frederick B. Whittemore.

    99.14      Common Stock Purchase Option No. TLW-1 dated        Filed herewith electronically
               March 10, 1999, executed by Tom L. Ward in favor
               of Frederick B. Whittemore.

    99.15      Common Stock Purchase Option No. AKM-2 dated        Filed herewith electronically
               March 10, 1999, executed by Aubrey K. McClendon
               in favor of Shannon Self

    99.16      Common Stock Purchase Option No. AKM-3 dated        Filed herewith electronically
               March 10, 1999, executed by Aubrey K. McClendon
               in favor of Talbot Fairfield II Limited
               Partnership

    99.17      Joint Filing Agreement                              Filed herewith electronically
</TABLE>


<PAGE>   1
                                                                   EXHIBIT 99.11


                            STOCK PURCHASE AGREEMENT

                  THIS AGREEMENT is entered into effective the 18th day of
November, 1999, among AUBREY K. McCLENDON, an individual ("McClendon"), with a
notice address at 6100 North Western, Oklahoma City, Oklahoma 73118, CHESAPEAKE
ENERGY MARKETING, INC., an Oklahoma corporation ("CEMI"), with a notice address
at 6100 North Western, Oklahoma City, Oklahoma 73118, and CHESAPEAKE OPERATING,
INC., an Oklahoma corporation ("COI"), with a notice address at 6100 North
Western, Oklahoma City, Oklahoma 73118.

                              W I T N E S S E T H :

                  WHEREAS, pursuant to that certain Second Amended and Restated
Loan Agreement dated effective December 31, 1998, between CEMI and McClendon,
CEMI extended a loan (the "CEMI Loan") to McClendon in the principal amount of
Four Million Eight Hundred Eighty-Five Thousand Dollars ($4,885,000.00) as
evidenced by that certain Amended and Restated Promissory Note dated effective
December 31, 1998 (the "Note");

                  WHEREAS, COI has extended credit to Chesapeake Investments, an
Oklahoma Limited Partnership ("Investments"), an affiliate of McClendon, for
joint interest billings (the "JIB Debt") in connection with the participation by
Investments in various oil and gas wells drilled and operated by COI pursuant to
that certain Amended and Restated Employment Agreement dated effective July 1,
1998, between McClendon and Chesapeake Energy Corporation, an Oklahoma
corporation ("CEC"), as amended by that certain First Amendment to Amended and
Restated Employment Agreement dated effective December 31, 1998;

                  WHEREAS, shares of Worldgate Communications, Inc., pledged to
secure the CEMI Loan, were sold and the proceeds from such sale in an amount
equal to Three Hundred Thousand Dollars ($300,000.00) have been or will be paid
to CEMI and applied against the CEMI Loan (the "Worldgate Proceeds"); and

                  WHEREAS, McClendon and CEMI desire to satisfy the CEMI Loan by
McClendon conveying to CEMI shares of CEC common stock, par value $.01 (the
"Common Stock"), having a Fair Market Value (as hereafter defined) equal to the
unpaid principal balance of the CEMI Loan plus any accrued and unpaid interest
and less the Worldgate Proceeds applied against the CEMI Loan.

                  NOW THEREFORE, in consideration of the agreements set forth
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereby agree as follows:

1.       Debt Amounts. As of November 18, 1999, and after the anticipated
application of the Worldgate Proceeds, the parties agree that: the amount due
and owing by McClendon for the CEMI Loan equals Three Million Eight Hundred
Ninety-Seven Thousand One Hundred Eight and 69/100 Dollars ($3,897,108.69)
consisting of unpaid principal in the amount of Three Million Eight Hundred
Forty-Six Thousand Eight Hundred Twenty-Seven and 55/100 Dollars ($3,846,827.55)

<PAGE>   2

                                                                   EXHIBIT 99.11


with accrued and unpaid interest in the amount of Fifty Thousand Two Hundred
Eighty-One and 14/100 Dollars ($50,281.14); and the amount of the JIB Debt owing
by Investments equals One Million Three Hundred Sixty-Two Thousand Twenty-Two
and 64/100 Dollars ($1,362,022.64).

2.       CEMI Loan. In accordance with the terms of this Agreement, McClendon
hereby sells to CEMI and CEMI hereby purchases from McClendon the number of
shares of Common Stock having a Fair Market Value equal to the unpaid principal
and interest for the CEMI Loan, which shares of Common Stock will be free and
clear of all liens, claims and encumbrances. Contemporaneous with the execution
of this Agreement, McClendon will deliver or cause to be delivered to CEMI:
shares of Common Stock evidenced by certificates in McClendon's name having a
Fair Market Value equal to the unpaid principal and interest for the CEMI Loan;
and a stock assignment separate from certificate covering such shares of Common
Stock executed by McClendon with signature guaranteed in form and substance
satisfactory to CEMI. For purposes of this Agreement the term "Fair Market
Value" means the lesser of the following: (y) the average of the closing price
for the Common Stock on the New York Stock Exchange for the ten (10) trading
days immediately preceding the date of this Agreement; or (z) the closing price
for the Common Stock on the New York Stock Exchange on the date immediately
prior to the date of this Agreement. On delivery of the foregoing Common Stock,
the CEMI Loan will be deemed to be satisfied in full and CEMI agrees to execute
and deliver to McClendon the receipt and acknowledgment at Schedule "A" attached
as a part hereof.

3.       Conditions Precedent. The obligation of CEMI and COI to perform the
terms of this Agreement are subject to the following conditions precedent: the
approval of this Agreement by CEC's Board Directors; the delivery by McClendon
of the required number of shares of Common Stock free and clear of all liens,
claims and encumbrances including, without implied limitation, any security
interest in the shares of Common Stock in favor of any margin lender; and the
grant and perfection of a first and prior security interest to COI by McClendon
or Investments in collateral reasonably acceptable to COI to secure the unpaid
balance of the JIB Debt in substantially the form at Schedule "B" attached as a
part hereof.

4.       Miscellaneous. It is further agreed as follows:

         4.1      Notices. All notices required hereunder will be in writing and
                  served by certified mail, return receipt requested, postage
                  prepaid, at the addresses shown above, until notification of a
                  change of such addresses. Any notice, demand or communication
                  required or permitted to be given by any provision of this
                  Agreement will be in writing and will be deemed to have been
                  given and received when delivered personally or by
                  telefacsimile to the party designated to receive such notice,
                  or on the date following the day sent by overnight courier, or
                  on the third (3rd) business day after the same is sent by
                  certified mail, postage and charges prepaid, directed to the
                  addresses shown above or to such other or additional addresses
                  as any party might designate by written notice to the other
                  parties.

         4.2      Binding Effect. This Agreement will inure to the benefit of
                  and bind the respective successors and permitted assigns of
                  the parties hereto.


                                      -2-
<PAGE>   3

                                                                   EXHIBIT 99.11

         4.3      Severability. If any clause or provision of this Agreement is
                  illegal, invalid or unenforceable under any present or future
                  law, the remainder of this Agreement will not be affected
                  thereby. It is the intention of the parties that if any such
                  provision is held to be illegal, invalid or unenforceable,
                  there will be added in lieu thereof a provision as similar in
                  terms to such provision as is possible to make such provision
                  legal, valid and enforceable.

         4.4      Entire Agreement. This Agreement constitutes the entire
                  agreement between McClendon and CEMI with respect to
                  McClendon's surrender of Common Stock in satisfaction of the
                  CEMI Loan.

         4.5      Headings. Paragraph or other headings contained in this
                  Agreement are for reference purposes only and are not intended
                  to affect in any way the meaning or interpretation of this
                  Agreement.

         4.6      Amendment. Neither this Agreement nor any of the provisions
                  hereof can be changed, waived, discharged or terminated,
                  except by an instrument in writing signed by the party against
                  whom enforcement of the change, waiver, discharge or
                  termination is sought.

         4.7      Governing Law. This Agreement shall be interpreted and
                  construed under and by virtue of the internal laws of the
                  State of Oklahoma, regardless of the domicile and/or residence
                  of the parties hereto.

                  IN WITNESS WHEREOF, the parties have executed this Agreement
effective the date first above written.

                                        /s/ Aubrey K. McClendon
                                        ----------------------------------------
                                        AUBREY K. McCLENDON, individually

                                        ("McClendon")


                                        CHESAPEAKE ENERGY MARKETING, INC., an
                                        Oklahoma corporation


                                        By /s/ Marcus C. Rowland
                                           -------------------------------------
                                           Marcus C. Rowland, Vice President
                                           and Chief Financial Officer

                                        ("CEMI")


                                      -3-

<PAGE>   4

                                                                   EXHIBIT 99.11


                                        CHESAPEAKE OPERATING, INC., an Oklahoma
                                        corporation

                                        By /s/ Marcus C. Rowland
                                           -------------------------------------
                                           Marcus C. Rowland, Executive Vice
                                           President and Chief Financial Officer

                                        ("COI")


                                      -4-

<PAGE>   1
                                                                   EXHIBIT 99.12


                            STOCK PURCHASE AGREEMENT


                  THIS AGREEMENT is entered into effective the 18th day of
November, 1999, among TOM L. WARD, an individual ("Ward"), with a notice address
at 6200 North Western, Oklahoma City, Oklahoma 73118, CHESAPEAKE ENERGY
MARKETING, INC., an Oklahoma corporation ("CEMI"), with a notice address at 6100
North Western, Oklahoma City, Oklahoma 73118, and CHESAPEAKE OPERATING, INC., an
Oklahoma corporation ("COI"), with a notice address at 6100 North Western,
Oklahoma City, Oklahoma 73118.

                              W I T N E S S E T H :

                  WHEREAS, pursuant to that certain Second Amended and Restated
Loan Agreement dated effective December 31, 1998, between CEMI and Ward, CEMI
extended a loan (the "CEMI Loan") to Ward in the principal amount of Five
Million Dollars ($5,000,000.00) as evidenced by that certain Amended and
Restated Promissory Note dated effective December 31, 1998 (the "Note");

                  WHEREAS, COI has extended credit to TLW Investments Inc., an
Oklahoma corporation ("Investments"), an affiliate of Ward, for joint interest
billings (the "JIB Debt") in connection with the participation by Investments in
various oil and gas wells drilled and operated by COI pursuant to that certain
Amended and Restated Employment Agreement dated effective July 1, 1998, between
Ward and Chesapeake Energy Corporation, an Oklahoma corporation ("CEC"), as
amended by that certain First Amendment to Amended and Restated Employment
Agreement dated effective December 31, 1998;

                  WHEREAS, shares of Worldgate Communications, Inc., pledged to
secure the CEMI Loan, were sold and the proceeds from such sale in an amount
equal to Three Hundred Thousand Dollars ($300,000.00) have been or will be paid
to CEMI and applied against the CEMI Loan (the "Worldgate Proceeds"); and

                  WHEREAS, Ward and CEMI desire to satisfy the CEMI Loan by Ward
conveying to CEMI shares of CEC common stock, par value $.01 (the "Common
Stock"), having a Fair Market Value (as hereafter defined) equal to the unpaid
principal balance of the CEMI Loan plus any accrued and unpaid interest and less
the Worldgate Proceeds applied against the CEMI Loan.

                  NOW THEREFORE, in consideration of the agreements set forth
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereby agree as follows:

1.       Debt Amounts. As of November 18, 1999, and after the anticipated
application of the Worldgate Proceeds, the parties agree that: the amount due
and owing by Ward for the CEMI Loan equals Three Million Seven Hundred
Thirty-Six Thousand Forty-Three and 37/100 Dollars ($3,736,043.37) consisting of
unpaid principal in the amount of Three Million Six Hundred Eighty-Seven
Thousand Eight Hundred Eighty-Seven and 78/100 ($3,687,887.78) with accrued and
unpaid interest in the amount of Forty-Eight Thousand One Hundred Fifty-Five and
59/100 Dollars

<PAGE>   2

                                                                   EXHIBIT 99.12


($48,155.59); and the amount of the JIB Debt owing by Investments
equals Eight Hundred Thirty-One Thousand Five Hundred Thirty-Three and 46/100
Dollars ($831,533.46).

2.       CEMI Loan. In accordance with the terms of this Agreement, Ward hereby
sells to CEMI and CEMI hereby purchases from Ward the number of shares of Common
Stock having a Fair Market Value equal to the unpaid principal and interest for
the CEMI Loan, which shares of Common Stock will be free and clear of all liens,
claims and encumbrances. Contemporaneous with the execution of this Agreement,
Ward will deliver or cause to be delivered to CEMI: shares of Common Stock
evidenced by certificates in Ward's name having a Fair Market Value equal to the
unpaid principal and interest for the CEMI Loan; and a stock assignment separate
from certificate covering such shares of Common Stock executed by Ward with
signature guaranteed in form and substance satisfactory to CEMI. For purposes of
this Agreement the term "Fair Market Value" means the lesser of the following:
(y) the average of the closing price for the Common Stock on the New York Stock
Exchange for the ten (10) trading days immediately preceding the date of this
Agreement; or (z) the closing price for the Common Stock on the New York Stock
Exchange on the date immediately prior to the date of this Agreement. On
delivery of the foregoing Common Stock, the CEMI Loan will be deemed to be
satisfied in full and CEMI agrees to execute and deliver to Ward the receipt and
acknowledgment at Schedule "A" attached as a part hereof.

3.       Conditions Precedent. The obligation of CEMI and COI to perform the
terms of this Agreement are subject to the following conditions precedent: the
approval of this Agreement by CEC's Board Directors; the delivery by Ward of the
required number of shares of Common Stock free and clear of all liens, claims
and encumbrances including, without implied limitation, any security interest in
the shares of Common Stock in favor of any margin lender; and the grant and
perfection of a first and prior security interest to COI by Ward or Investments
in collateral reasonably acceptable to COI to secure the unpaid balance of the
JIB Debt in substantially the form at Schedule "B" attached as a part hereof.

4.       Miscellaneous. It is further agreed as follows:

         4.1      Notices. All notices required hereunder will be in writing and
                  served by certified mail, return receipt requested, postage
                  prepaid, at the addresses shown above, until notification of a
                  change of such addresses. Any notice, demand or communication
                  required or permitted to be given by any provision of this
                  Agreement will be in writing and will be deemed to have been
                  given and received when delivered personally or by
                  telefacsimile to the party designated to receive such notice,
                  or on the date following the day sent by overnight courier, or
                  on the third (3rd) business day after the same is sent by
                  certified mail, postage and charges prepaid, directed to the
                  addresses shown above or to such other or additional addresses
                  as any party might designate by written notice to the other
                  parties.

         4.2      Binding Effect. This Agreement will inure to the benefit of
                  and bind the respective successors and permitted assigns of
                  the parties hereto.

         4.3      Severability. If any clause or provision of this Agreement is
                  illegal, invalid or unenforceable under any present or future
                  law, the remainder of this Agreement will


                                      -2-
<PAGE>   3
                                                                   EXHIBIT 99.12


                  not be affected thereby. It is the intention of the parties
                  that if any such provision is held to be illegal, invalid or
                  unenforceable, there will be added in lieu thereof a provision
                  as similar in terms to such provision as is possible to make
                  such provision legal, valid and enforceable.

         4.4      Entire Agreement. This Agreement constitutes the entire
                  agreement between Ward and CEMI with respect to Ward's
                  surrender of Common Stock in satisfaction of the CEMI Loan.

         4.5      Headings. Paragraph or other headings contained in this
                  Agreement are for reference purposes only and are not intended
                  to affect in any way the meaning or interpretation of this
                  Agreement.

         4.6      Amendment. Neither this Agreement nor any of the provisions
                  hereof can be changed, waived, discharged or terminated,
                  except by an instrument in writing signed by the party against
                  whom enforcement of the change, waiver, discharge or
                  termination is sought.

         4.7      Governing Law. This Agreement shall be interpreted and
                  construed under and by virtue of the internal laws of the
                  State of Oklahoma, regardless of the domicile and/or residence
                  of the parties hereto.

                  IN WITNESS WHEREOF, the parties have executed this Agreement
effective the date first above written.


                                           /s/ Tom L. Ward
                                           -------------------------------------
                                           TOM L. WARD, individually

                                           ("Ward")

                                           CHESAPEAKE ENERGY MARKETING, INC., an
                                           Oklahoma corporation


                                           By /s/ Marcus C. Rowland
                                              ----------------------------------
                                              Marcus C. Rowland, Vice President
                                              and Chief Financial Officer

                                           ("CEMI")


                                      -3-

<PAGE>   4
                                                                   EXHIBIT 99.12


                                           CHESAPEAKE OPERATING, INC., an
                                           Oklahoma corporation


                                           By /s/ Marcus C. Rowland
                                              ----------------------------------
                                              Marcus C. Rowland, Executive Vice
                                              President and Chief Financial
                                              Officer

                                          ("COI")


                                      -4-

<PAGE>   1
                                                                   EXHIBIT 99.13



THIS OPTION AND THE COMMON STOCK TO BE CONVEYED PURSUANT TO THIS OPTION HAVE NOT
BEEN REGISTERED UNDER ANY FEDERAL OR STATE SECURITIES LAWS. THIS OPTION AND THE
COMMON STOCK TO BE CONVEYED PURSUANT TO THIS OPTION MAY NOT BE SOLD,
TRANSFERRED, ASSIGNED OR OTHERWISE DISPOSED OF WITHOUT REGISTRATION UNDER THE
SECURITIES ACT OF 1933, ANY APPLICABLE STATE SECURITIES LAWS AND ANY APPLICABLE
BLUE SKY ACTS, UNLESS AND UNTIL THE HOLDER HEREOF COMPLIES WITH THE PROVISIONS
OF THIS OPTION AND PROVIDES (i) INFORMATION SATISFACTORY TO THE SELLER AND THE
COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED OR (ii) AN OPINION OF COUNSEL
ACCEPTABLE TO THE SELLER AND THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.


                          COMMON STOCK PURCHASE OPTION


No. AKM-1                           For the Purchase of 394,688 Shares of Common
                                    Stock of Chesapeake Energy Corporation


                  FOR VALUE RECEIVED, FREDERICK B. WHITTEMORE, an individual
(the "Holder"), is hereby granted the right (the "Option") to purchase from
AUBREY K. McCLENDON, an individual (the "Seller"), at any time after the
Effective Date (as hereafter defined) but not later than the Termination Date
(as hereafter defined), up to Three Hundred Ninety-Four Thousand Six Hundred
Eighty-Eight (394,688) shares of common stock, $.01 par value ("Common Stock")
of Chesapeake Energy Corporation, an Oklahoma corporation (the "Company"), at
the Purchase Price (as hereafter defined) and on the terms and conditions herein
set forth. The Purchase Price and the number of shares of Common Stock
purchasable are subject to adjustment on the occurrence of certain contingencies
set forth in this Option. On presentation and surrender of this Option, together
with payment of the Purchase Price for the shares of Common Stock thereby
purchased, at the office of the Seller in Oklahoma City, Oklahoma, the
registered Holder of this Option will be entitled to receive a certificate or
certificates for the shares of Common Stock so purchased.

                  This Option is issued pursuant to the provisions of that
certain Loan Agreement dated effective March 10, 1999 (the "Loan Agreement")
between the Seller and the Holder.

                  This Option is subject to the following terms and conditions:

1. Exercise of Option. The right to purchase the Common Stock represented by
this Option is exercisable at the option of the Holder hereof: (a) for fifty
percent (50%) of the Option Shares (as hereinafter defined) in whole or in part
at any time prior to the Termination Date; and (b) in the event the Seller fails
to satisfy the terms of paragraph 6.2 of this Option on or before February 29,
2000 (the "Prepayment Date") for the remaining fifty percent (50%) of the Option
Shares in whole or in part at any time after the Prepayment Date and prior to
the Termination Date. This



<PAGE>   2


                                                                   EXHIBIT 99.13



Option may be exercised by the delivery to the Seller of written notice of the
exercise of this Option, surrender of this Option to the Seller and the payment
of the Purchase Price. The Purchase Price for the Option Shares may be paid: (a)
in immediately available funds of the United States of America; (b) by tendering
to the Seller an equivalent principal or accrued interest credit under the terms
of the Loan Agreement; or (c) by the Holder surrendering or assigning to the
Seller the rights to purchase the number of Option Shares under this Option,
which are not being exercised pursuant to such notice, with a value equal to the
Purchase Price. For purposes of the foregoing clause (c), value is deemed to be
the difference between the current market price per share of Common Stock and
the exercise price of the Option Shares for which the rights are being
surrendered by the Holder. In the case of the purchase of less than all the
shares purchasable under this Option, the Seller will cancel this Option on the
surrender hereof and will execute and deliver a new Option of like tenor for the
balance of the shares purchasable hereunder.

2. Term. This Option may be exercised for up to fifty percent (50%) of the
Option Shares at any time after the date hereof and, if the conditions set forth
in paragraph 6.2 hereof are not met on or before the Prepayment Date, for one
hundred percent (100%) of the Option Shares at any time after the Prepayment
Date (the "Effective Date"), and on or before August 31, 2006 (the "Termination
Date"). If the Option to purchase all or part of the shares has not been
exercised prior to the Termination Date, this Option and all of the rights of
the Holder hereunder will expire and terminate on such date without notice by
the Seller.

3. Purchase Price. On the exercise of this Option, the Holder agrees to pay to
the Seller for each share of Common Stock purchased by the Holder pursuant to
the terms of this Option (the "Option Shares") an amount (the "Purchase Price")
equal to fifty cents ($0.50). The Purchase Price and number of shares will be
subject to the adjustments set forth in paragraph 6 of this Option.

4. Representations and Warranties of the Seller. The Seller represents and
warrants to and agrees with the Holder as follows:

         4.1      Sufficient Shares. The Seller owns sufficient shares of Common
                  Stock to fulfill the Seller's obligations under this Option.
                  On exercise of this Option and payment of the Purchase Price,
                  the Option Shares issued to the Holder will be validly issued,
                  fully paid and nonassessable and free and clear of all liens,
                  claims and encumbrances.

         4.2      Authority. The Seller has taken all necessary action to
                  authorize the execution and delivery of this Option, the sales
                  of the shares of Common Stock upon exercise hereof, and this
                  Option is, or will be upon issuance, a valid, binding and
                  enforceable obligation of the Seller. The execution and
                  delivery of this Option will not violate: (a) any order, writ,
                  injunction or decree of any court, administrative agency or
                  governmental body applicable to the Seller or the Common
                  Stock; or (b) any contract, lease, note, bond, mortgage or
                  other agreement to which the Seller is a party, by which the
                  Seller is bound or to which any of the Seller's assets are
                  subject.


                                      - 2 -

<PAGE>   3


                                                                   EXHIBIT 99.13



5. Representations and Warranties of the Holder. The Holder represents, warrants
and agrees with the Seller and the Company as follows:

         5.1      Accredited Investor. The Holder meets all of the
                  qualifications and is an "accredited investor" as that term is
                  defined in Rule 501(a) of Regulation D promulgated pursuant to
                  the Securities Act of 1933 (the "Securities Act").

         5.2      Restrictive Legend. This Option is being acquired and any
                  Option Shares to be acquired by the Holder pursuant to this
                  Option (collectively, "Securities") will be acquired for
                  investment for the Holder's own account and not with a view
                  to, or for resale in connection with, any distribution of such
                  Securities within the meaning of the Securities Act. The
                  Securities will not be sold, transferred or otherwise disposed
                  of without registration under the Securities Act and state
                  securities laws or qualifications for exemptions therefrom.
                  The Holder agrees that each certificate representing the
                  Option Shares may be inscribed with a legend to the foregoing
                  effect, which legend will be as follows:

                           "The shares represented by this certificate have been
                           acquired solely for investment purposes and have not
                           been registered under the Securities Act of 1933, as
                           amended, or the securities laws of any state. The
                           shares may not be sold, transferred, assigned or
                           otherwise disposed of unless and until such shares
                           are first registered under the Securities Act of
                           1933, all applicable state securities laws and all
                           rules and regulations promulgated thereunder or
                           unless and until the holder hereof provides either
                           (i) information satisfactory to the Company that such
                           registration is not required or (ii) an opinion of
                           counsel acceptable to the Company to the effect that
                           such registration is not required."

                  The Holder agrees that the Company may place a stop transfer
                  order with the Company's transfer agent, if any, with respect
                  to any noncomplying transfer of the certificates representing
                  any such Common Stock, which stop transfer order will be
                  removed upon compliance with the provisions hereof.

6. Adjustments. The Purchase Price and the number of shares of Common Stock
issuable on exercise of this Option will be subject to adjustment as follows:

         6.1      Adjustment to Purchase Price. The Purchase Price pursuant to
                  which Common Stock may be acquired hereunder will be subject
                  to the adjustments herein set forth for transactions described
                  below which occur after the date of this Option.

                  6.1.1    Issuance of Common Stock. If at any time subsequent
                           to the date hereof the Company issues or sells any
                           shares of Common Stock for a consideration per share
                           of Common Stock less than the Purchase Price, the
                           Purchase Price for the shares of Common Stock which
                           remain to be purchased under this Option will be
                           reduced to the per share price received

                                      - 3 -

<PAGE>   4


                                                                   EXHIBIT 99.13



                           by the Company on such issue or sale. The adjustment
                           provided for in this paragraph will not be made as a
                           result of the issuance or purchase of any shares of
                           Common Stock reserved for issuance and subsequently
                           issued pursuant to any stock option plan for
                           employees of the Company or professional persons
                           retained by the Company in the ordinary course of the
                           Company's business.

                  6.1.2    Consideration for Stock. If any shares of Common
                           Stock are issued or sold by the Company for cash paid
                           or to be paid, the consideration received will be
                           deemed to be the amount received and to be received
                           by the Company for such shares of Common Stock. If
                           any shares of Common Stock are issued or sold by the
                           Company for consideration other than cash, the amount
                           of consideration will be the fair value of such
                           consideration received and to be received, as
                           determined in good faith by the Company's board of
                           directors. In determining consideration received by
                           the Company, expenses, underwriting commissions or
                           concessions paid or allowed by the Company will not
                           be deducted. If the Company distributes with respect
                           to the Common Stock shares of Common Stock, rights or
                           options to subscribe for or purchase shares of Common
                           Stock ("Options") or securities convertible into or
                           exchangeable for shares of Common Stock ("Convertible
                           Securities") and a Purchase Price adjustment is made
                           on the issuance of such Options or Convertible
                           Securities, then any share of Common Stock issuable
                           in satisfaction of such distribution, or in
                           connection with the exercise of the Options or in
                           connection with the conversion of the Convertible
                           Securities will be deemed issued or sold without
                           consideration but no additional adjustment to the
                           Purchase Price will be made by reason thereof.

         6.2      Share Adjustments. If, on or before February 29, 2000, the
                  loan made pursuant to the Loan Agreement is: (a) paid in full
                  with interest at ten percent (10%) per annum from September 1,
                  1998 until the date of payment; or (b) fully secured with
                  collateral acceptable to the Holder, as provided in paragraph
                  8 of the Loan Agreement, then the number of shares of Common
                  Stock covered by this Option will decrease to One Hundred
                  Ninety-Seven Thousand Three Hundred Forty-Four (197,344). In
                  addition, the number of shares of Common Stock to be issued
                  pursuant to this Option will be adjusted (a) in the event the
                  Company issued any Options, Convertible Securities or shares
                  of Common Stock as a stock dividend, (b) issues any shares of
                  Common Stock by reclassification of its Common Stock, or (c)
                  subdivides or combines its Common Stock. The shares of Common
                  Stock to be conveyed pursuant to this Option at the time of
                  the effective date of such stock dividend, subdivisions,
                  combination or reclassification will be adjusted, effective at
                  the opening of business on the business day next following
                  such record date or effective date, so the Holder will be
                  entitled to receive the number of shares of Common Stock which
                  the Holder would have owned or been entitled to receive had
                  such shares of Common Stock been converted immediately prior
                  to such time.


                                      - 4 -

<PAGE>   5


                                                                   EXHIBIT 99.13



         6.3      Option Need Not be Changed to Reflect Adjustments.
                  Irrespective of any adjustment or change in the Purchase Price
                  or the number of shares of Common Stock actually purchasable
                  hereunder, this Option after issuance may continue to express
                  the Purchase Price per share and the number of shares
                  purchasable hereunder as if the adjusted Purchase Price per
                  share and the number of shares purchasable were expressed in
                  this Option when initially issued.

         6.4      Reorganization, Merger, Etc. If any capital reorganization,
                  recapitalization or reclassification of the capital stock of
                  the Company, a consolidation or merger of the Company with
                  another corporation or the sale or conveyance of all or
                  substantially all of the Company's assets to another
                  corporation is affected, the Holder will have the right to
                  purchase and receive on the basis, terms and conditions
                  specified in this Option such shares of stock, securities or
                  assets as may be issued or payable with respect to or in
                  exchange for Common Stock equal to the number of shares of
                  such Common Stock immediately theretofore purchasable and
                  receivable upon the exercise of this Option had the
                  reorganization, reclassification, recapitalization,
                  consolidation, merger, sale or conveyance not taken place. In
                  each such case, appropriate provisions will be made with
                  respect to the rights and interests of the Holder of this
                  Option to the end that the provisions hereof (including
                  without limitation provisions for adjustment of the Purchase
                  Price and of the number of shares purchasable upon the
                  exercise of this Option) will thereafter be applicable, as
                  nearly as may be practicable to any stock, securities or
                  assets to be acquired under this Option.

         6.5      Notice to Holder. On any adjustment of the Purchase Price or
                  an increase or decrease in the number of shares of Common
                  Stock purchasable on the exercise of this Option, the Seller
                  will, within thirty (30) days after such adjustment, give
                  written notice of such adjustment and the method of
                  calculating the adjustment and the facts (including a
                  statement of the consideration received or deemed to have been
                  received by the Company) on which such calculations are based.

         6.6      Record Date. If the Company sets a record date for the purpose
                  of entitling the holders of Common Stock to (a) receive a
                  dividend or other distribution payable in shares of Common
                  Stock, or (b) subscribe for or purchase shares of Common
                  Stock, then such record date will be deemed to be the date of
                  the issue or sale of the shares of Common Stock deemed to have
                  been issued or sold upon the declaration of such dividend or
                  the making of such other distribution or the date of the
                  granting of such right of subscription or purchase, as the
                  case may be.

         6.7      Treasury Shares. The number of shares of Common Stock
                  outstanding at any given time will not include shares owned or
                  held by or for the account of the Company, and the disposition
                  of any such shares will be considered an issue or sale of
                  shares of Common Stock for the purpose of this paragraph 6.

7. Status of Holder. This Option does not entitle the Holder hereof to any
voting rights or other rights as a shareholder of the Company.

                                      - 5 -

<PAGE>   6


                                                                   EXHIBIT 99.13



8. No Fractional Shares. The Company will not be required to issue stock
certificates representing fractions of shares of Common Stock.

9. Cash Payment. The Seller will have the right to satisfy this Option in cash
if as a result of continuing margin account liens or exercise of remedies by
margin account lenders, the Seller does not possess sufficient shares of Common
Stock on the date this Option is exercised or "in the money" exercisable options
sufficient to satisfy the Option exercise.

10. Notices. All notices, requests, consents and other communications hereunder
will be in writing and will be deemed to have been made when delivered or when
mailed first class postage prepaid or delivered to the telegraph office:

         (i)      if to the Holder of this Option, at the address of the Holder
                  as set forth below the Holder's signature hereon, or at such
                  other address as may have been furnished to the Seller in
                  writing by the Holder; or

         (ii)     if to the Seller, 6100 North Western, Oklahoma City, Oklahoma
                  73118, or at such other address as may have been furnished to
                  the Holder in writing by the Seller.

11. Headings. The headings of the paragraphs of this Option are inserted for
convenience only and will not be deemed to constitute a part of this Option.

12. Governing Law. This Option is being delivered and is intended to be
performed in the State of Oklahoma and will be construed and enforced in
accordance with, and the rights of the parties shall be governed by, the law of
such state.

13. Assignment. Subject to the conditions set forth herein, this Option and all
rights hereunder are transferable by the Holder, in whole or in part.

                  IN WITNESS WHEREOF, this Option has been executed effective
the 10th day of March, 1999.

                                    /s/Aubrey K. McClendon
                                    --------------------------------------------
                                    AUBREY K. McCLENDON, individually

                                   (the "Seller")

                                    /s/ Frederick B. Whittemore
                                    --------------------------------------------
                                   FREDERICK B. WHITTEMORE, individually
                                   c/o Morgan Stanley & Company
                                   1221 Avenue of the Americas, 30th Floor
                                   New York City, New York 10020

                                   (the "Holder")



                                      - 6 -





<PAGE>   1
                                                                   EXHIBIT 99.14



THIS OPTION AND THE COMMON STOCK TO BE CONVEYED PURSUANT TO THIS OPTION HAVE NOT
BEEN REGISTERED UNDER ANY FEDERAL OR STATE SECURITIES LAWS. THIS OPTION AND THE
COMMON STOCK TO BE CONVEYED PURSUANT TO THIS OPTION MAY NOT BE SOLD,
TRANSFERRED, ASSIGNED OR OTHERWISE DISPOSED OF WITHOUT REGISTRATION UNDER THE
SECURITIES ACT OF 1933, ANY APPLICABLE STATE SECURITIES LAWS AND ANY APPLICABLE
BLUE SKY ACTS, UNLESS AND UNTIL THE HOLDER HEREOF COMPLIES WITH THE PROVISIONS
OF THIS OPTION AND PROVIDES (i) INFORMATION SATISFACTORY TO THE SELLER AND THE
COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED OR (ii) AN OPINION OF COUNSEL
ACCEPTABLE TO THE SELLER AND THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.


                          COMMON STOCK PURCHASE OPTION


No. TLW-1                         For the Purchase of 355,312 Shares of Common
                                  Stock of Chesapeake Energy Corporation


                  FOR VALUE RECEIVED, FREDERICK B. WHITTEMORE, an individual
(the "Holder"), is hereby granted the right (the "Option") to purchase from TOM
L. WARD, an individual (the "Seller"), at any time after the Effective Date (as
hereafter defined) but not later than the Termination Date (as hereafter
defined), up to Three Hundred Fifty-Five Thousand Three Hundred Twelve (355,312)
shares of common stock, $.01 par value ("Common Stock") of Chesapeake Energy
Corporation, an Oklahoma corporation (the "Company"), at the Purchase Price (as
hereafter defined) and on the terms and conditions herein set forth. The
Purchase Price and the number of shares of Common Stock purchasable are subject
to adjustment on the occurrence of certain contingencies set forth in this
Option. On presentation and surrender of this Option, together with payment of
the Purchase Price for the shares of Common Stock thereby purchased, at the
office of the Seller in Oklahoma City, Oklahoma, the registered Holder of this
Option will be entitled to receive a certificate or certificates for the shares
of Common Stock so purchased.

                  This Option is issued pursuant to the provisions of that
certain Loan Agreement dated effective March 10, 1999 (the "Loan Agreement")
between the Seller and the Holder.

                  This Option is subject to the following terms and conditions:

1.       Exercise of Option. The right to purchase the Common Stock represented
by this Option is exercisable at the option of the Holder hereof: (a) for fifty
percent (50%) of the Option Shares (as hereinafter defined) in whole or in part
at any time prior to the Termination Date; and (b) in the event the Seller fails
to satisfy the terms of paragraph 6.2 of this Option on or before February 29,
2000 (the "Prepayment Date") for the remaining fifty percent (50%) of the Option
Shares in whole or in part at any time after the Prepayment Date and prior to
the Termination Date. This

<PAGE>   2
                                                                   EXHIBIT 99.14


Option may be exercised by the delivery to the Seller of written notice of the
exercise of this Option, surrender of this Option to the Seller and the payment
of the Purchase Price. The Purchase Price for the Option Shares may be paid: (a)
in immediately available funds of the United States of America; (b) by tendering
to the Seller an equivalent principal or accrued interest credit under the terms
of the Loan Agreement; or (c) by the Holder surrendering or assigning to the
Seller the rights to purchase the number of Option Shares under this Option,
which are not being exercised pursuant to such notice, with a value equal to the
Purchase Price. For purposes of the foregoing clause (c), value is deemed to be
the difference between the current market price per share of Common Stock and
the exercise price of the Option Shares for which the rights are being
surrendered by the Holder. In the case of the purchase of less than all the
shares purchasable under this Option, the Seller will cancel this Option on the
surrender hereof and will execute and deliver a new Option of like tenor for the
balance of the shares purchasable hereunder.

2.       Term. This Option may be exercised for up to fifty percent (50%) of the
Option Shares at any time after the date hereof and, if the conditions set forth
in paragraph 6.2 hereof are not met on or before the Prepayment Date, for one
hundred percent (100%) of the Option Shares at any time after the Prepayment
Date (the "Effective Date"), and on or before August 31, 2006 (the "Termination
Date"). If the Option to purchase all or part of the shares has not been
exercised prior to the Termination Date, this Option and all of the rights of
the Holder hereunder will expire and terminate on such date without notice by
the Seller.

3.       Purchase Price. On the exercise of this Option, the Holder agrees to
pay to the Seller for each share of Common Stock purchased by the Holder
pursuant to the terms of this Option (the "Option Shares") an amount (the
"Purchase Price") equal to fifty cents ($0.50). The Purchase Price and number of
shares will be subject to the adjustments set forth in paragraph 6 of this
Option.

4.       Representations and Warranties of the Seller. The Seller represents and
warrants to and agrees with the Holder as follows:

         4.1      Sufficient Shares. The Seller owns sufficient shares of Common
                  Stock to fulfill the Seller's obligations under this Option.
                  On exercise of this Option and payment of the Purchase Price,
                  the Option Shares issued to the Holder will be validly issued,
                  fully paid and nonassessable and free and clear of all liens,
                  claims and encumbrances.

         4.2      Authority. The Seller has taken all necessary action to
                  authorize the execution and delivery of this Option, the sales
                  of the shares of Common Stock upon exercise hereof, and this
                  Option is, or will be upon issuance, a valid, binding and
                  enforceable obligation of the Seller. The execution and
                  delivery of this Option will not violate: (a) any order, writ,
                  injunction or decree of any court, administrative agency or
                  governmental body applicable to the Seller or the Common
                  Stock; or (b) any contract, lease, note, bond, mortgage or
                  other agreement to which the Seller is a party, by which the
                  Seller is bound or to which any of the Seller's assets are
                  subject.

                                      -2-
<PAGE>   3
                                                                   EXHIBIT 99.14


5.       Representations and Warranties of the Holder. The Holder represents,
warrants and agrees with the Seller and the Company as follows:

         5.1      Accredited Investor. The Holder meets all of the
                  qualifications and is an "accredited investor" as that term is
                  defined in Rule 501(a) of Regulation D promulgated pursuant to
                  the Securities Act of 1933 (the "Securities Act").

         5.2      Restrictive Legend. This Option is being acquired and any
                  Option Shares to be acquired by the Holder pursuant to this
                  Option (collectively, "Securities") will be acquired for
                  investment for the Holder's own account and not with a view
                  to, or for resale in connection with, any distribution of such
                  Securities within the meaning of the Securities Act. The
                  Securities will not be sold, transferred or otherwise disposed
                  of without registration under the Securities Act and state
                  securities laws or qualifications for exemptions therefrom.
                  The Holder agrees that each certificate representing the
                  Option Shares may be inscribed with a legend to the foregoing
                  effect, which legend will be as follows:

                           "The shares represented by this certificate have been
                           acquired solely for investment purposes and have not
                           been registered under the Securities Act of 1933, as
                           amended, or the securities laws of any state. The
                           shares may not be sold, transferred, assigned or
                           otherwise disposed of unless and until such shares
                           are first registered under the Securities Act of
                           1933, all applicable state securities laws and all
                           rules and regulations promulgated thereunder or
                           unless and until the holder hereof provides either
                           (i) information satisfactory to the Company that such
                           registration is not required or (ii) an opinion of
                           counsel acceptable to the Company to the effect that
                           such registration is not required."

                  The Holder agrees that the Company may place a stop transfer
                  order with the Company's transfer agent, if any, with respect
                  to any noncomplying transfer of the certificates representing
                  any such Common Stock, which stop transfer order will be
                  removed upon compliance with the provisions hereof.

6.       Adjustments. The Purchase Price and the number of shares of Common
Stock issuable on exercise of this Option will be subject to adjustment as
follows:

         6.1      Adjustment to Purchase Price. The Purchase Price pursuant to
                  which Common Stock may be acquired hereunder will be subject
                  to the adjustments herein set forth for transactions described
                  below which occur after the date of this Option.

                  6.1.1    Issuance of Common Stock. If at any time subsequent
                           to the date hereof the Company issues or sells any
                           shares of Common Stock for a consideration per share
                           of Common Stock less than the Purchase Price, the
                           Purchase Price for the shares of Common Stock which
                           remain to be purchased under this Option will be
                           reduced to the per share price received


                                      -3-
<PAGE>   4
                                                                   EXHIBIT 99.14



                           by the Company on such issue or sale. The adjustment
                           provided for in this paragraph will not be made as a
                           result of the issuance or purchase of any shares of
                           Common Stock reserved for issuance and subsequently
                           issued pursuant to any stock option plan for
                           employees of the Company or professional persons
                           retained by the Company in the ordinary course of the
                           Company's business.

                  6.1.2    Consideration for Stock. If any shares of Common
                           Stock are issued or sold by the Company for cash paid
                           or to be paid, the consideration received will be
                           deemed to be the amount received and to be received
                           by the Company for such shares of Common Stock. If
                           any shares of Common Stock are issued or sold by the
                           Company for consideration other than cash, the amount
                           of consideration will be the fair value of such
                           consideration received and to be received, as
                           determined in good faith by the Company's board of
                           directors. In determining consideration received by
                           the Company, expenses, underwriting commissions or
                           concessions paid or allowed by the Company will not
                           be deducted. If the Company distributes with respect
                           to the Common Stock shares of Common Stock, rights or
                           options to subscribe for or purchase shares of Common
                           Stock ("Options") or securities convertible into or
                           exchangeable for shares of Common Stock ("Convertible
                           Securities") and a Purchase Price adjustment is made
                           on the issuance of such Options or Convertible
                           Securities, then any share of Common Stock issuable
                           in satisfaction of such distribution, or in
                           connection with the exercise of the Options or in
                           connection with the conversion of the Convertible
                           Securities will be deemed issued or sold without
                           consideration but no additional adjustment to the
                           Purchase Price will be made by reason thereof.

         6.2      Share Adjustments. If, on or before February 29, 2000, the
                  loan made pursuant to the Loan Agreement is: (a) paid in full
                  with interest at ten percent (10%) per annum from September 1,
                  1998 until the date of payment; or (b) fully secured with
                  collateral acceptable to the Holder, as provided in paragraph
                  8 of the Loan Agreement, then the number of shares of Common
                  Stock covered by this Option will decrease to One Hundred
                  Seventy-Seven Thousand Six Hundred Fifty-Six (177,656). In
                  addition, the number of shares of Common Stock to be issued
                  pursuant to this Option will be adjusted (a) in the event the
                  Company issued any Options, Convertible Securities or shares
                  of Common Stock as a stock dividend, (b) issues any shares of
                  Common Stock by reclassification of its Common Stock, or (c)
                  subdivides or combines its Common Stock. The shares of Common
                  Stock to be conveyed pursuant to this Option at the time of
                  the effective date of such stock dividend, subdivisions,
                  combination or reclassification will be adjusted, effective at
                  the opening of business on the business day next following
                  such record date or effective date, so the Holder will be
                  entitled to receive the number of shares of Common Stock which
                  the Holder would have owned or been entitled to receive had
                  such shares of Common Stock been converted immediately prior
                  to such time.

                                      -4-
<PAGE>   5
                                                                   EXHIBIT 99.14


         6.3      Option Need Not be Changed to Reflect Adjustments.
                  Irrespective of any adjustment or change in the Purchase Price
                  or the number of shares of Common Stock actually purchasable
                  hereunder, this Option after issuance may continue to express
                  the Purchase Price per share and the number of shares
                  purchasable hereunder as if the adjusted Purchase Price per
                  share and the number of shares purchasable were expressed in
                  this Option when initially issued.

         6.4      Reorganization, Merger, Etc. If any capital reorganization,
                  recapitalization or reclassification of the capital stock of
                  the Company, a consolidation or merger of the Company with
                  another corporation or the sale or conveyance of all or
                  substantially all of the Company's assets to another
                  corporation is affected, the Holder will have the right to
                  purchase and receive on the basis, terms and conditions
                  specified in this Option such shares of stock, securities or
                  assets as may be issued or payable with respect to or in
                  exchange for Common Stock equal to the number of shares of
                  such Common Stock immediately theretofore purchasable and
                  receivable upon the exercise of this Option had the
                  reorganization, reclassification, recapitalization,
                  consolidation, merger, sale or conveyance not taken place. In
                  each such case, appropriate provisions will be made with
                  respect to the rights and interests of the Holder of this
                  Option to the end that the provisions hereof (including
                  without limitation provisions for adjustment of the Purchase
                  Price and of the number of shares purchasable upon the
                  exercise of this Option) will thereafter be applicable, as
                  nearly as may be practicable to any stock, securities or
                  assets to be acquired under this Option.

         6.5      Notice to Holder. On any adjustment of the Purchase Price or
                  an increase or decrease in the number of shares of Common
                  Stock purchasable on the exercise of this Option, the Seller
                  will, within thirty (30) days after such adjustment, give
                  written notice of such adjustment and the method of
                  calculating the adjustment and the facts (including a
                  statement of the consideration received or deemed to have been
                  received by the Company) on which such calculations are based.

         6.6      Record Date. If the Company sets a record date for the purpose
                  of entitling the holders of Common Stock to (a) receive a
                  dividend or other distribution payable in shares of Common
                  Stock, or (b) subscribe for or purchase shares of Common
                  Stock, then such record date will be deemed to be the date of
                  the issue or sale of the shares of Common Stock deemed to have
                  been issued or sold upon the declaration of such dividend or
                  the making of such other distribution or the date of the
                  granting of such right of subscription or purchase, as the
                  case may be.

         6.7      Treasury Shares. The number of shares of Common Stock
                  outstanding at any given time will not include shares owned or
                  held by or for the account of the Company, and the disposition
                  of any such shares will be considered an issue or sale of
                  shares of Common Stock for the purpose of this paragraph 6.

7.       Status of Holder. This Option does not entitle the Holder hereof to any
voting rights or other rights as a shareholder of the Company.


                                      -5-
<PAGE>   6
                                                                   EXHIBIT 99.14


8.       No Fractional Shares. The Company will not be required to issue stock
certificates representing fractions of shares of Common Stock.

9.       Cash Payment. The Seller will have the right to satisfy this Option in
cash if as a result of continuing margin account liens or exercise of remedies
by margin account lenders, the Seller does not possess sufficient shares of
Common Stock on the date this Option is exercised or "in the money" exercisable
options sufficient to satisfy the Option exercise.

10.      Notices. All notices, requests, consents and other communications
hereunder will be in writing and will be deemed to have been made when delivered
or when mailed first class postage prepaid or delivered to the telegraph office:

         (i)      if to the Holder of this Option, at the address of the Holder
                  as set forth below the Holder's signature hereon, or at such
                  other address as may have been furnished to the Seller in
                  writing by the Holder; or

         (ii)     if to the Seller, 6100 North Western, Oklahoma City, Oklahoma
                  73118, or at such other address as may have been furnished to
                  the Holder in writing by the Seller.

11.      Headings. The headings of the paragraphs of this Option are inserted
for convenience only and will not be deemed to constitute a part of this Option.

12.      Governing Law. This Option is being delivered and is intended to be
performed in the State of Oklahoma and will be construed and enforced in
accordance with, and the rights of the parties shall be governed by, the law of
such state.

13.      Assignment. Subject to the conditions set forth herein, this Option and
all rights hereunder are transferable by the Holder, in whole or in part.

                  IN WITNESS WHEREOF, this Option has been executed effective
the 10th day of March, 1999.

                                        /s/ Tom L. Ward
                                        ---------------------------------------
                                        TOM L. WARD, individually

                                        (the "Seller")

                                        /s/ Frederick B. Whittemore
                                        ---------------------------------------
                                        FREDERICK B. WHITTEMORE, individually
                                        c/o Morgan Stanley & Company
                                        1221 Avenue of the Americas, 30th Floor
                                        New York City, New York 10020

                                        (the "Holder")


                                      -6-



<PAGE>   1
                                                                   EXHIBIT 99.15


THIS OPTION AND THE COMMON STOCK TO BE CONVEYED PURSUANT TO THIS OPTION HAVE NOT
BEEN REGISTERED UNDER ANY FEDERAL OR STATE SECURITIES LAWS. THIS OPTION AND THE
COMMON STOCK TO BE CONVEYED PURSUANT TO THIS OPTION MAY NOT BE SOLD,
TRANSFERRED, ASSIGNED OR OTHERWISE DISPOSED OF WITHOUT REGISTRATION UNDER THE
SECURITIES ACT OF 1933, ANY APPLICABLE STATE SECURITIES LAWS AND ANY APPLICABLE
BLUE SKY ACTS, UNLESS AND UNTIL THE HOLDER HEREOF COMPLIES WITH THE PROVISIONS
OF THIS OPTION AND PROVIDES (i) INFORMATION SATISFACTORY TO THE SELLER AND THE
COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED OR (ii) AN OPINION OF COUNSEL
ACCEPTABLE TO THE SELLER AND THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.


                          COMMON STOCK PURCHASE OPTION


No. AKM-2                  For the Purchase of 37,500 Shares of Common Stock of
                           Chesapeake Energy Corporation


                  FOR VALUE RECEIVED, SHANNON SELF, an individual (the
"Holder"), is hereby granted the right (the "Option") to purchase from AUBREY K.
McCLENDON, an individual (the "Seller"), at any time after the Effective Date
(as hereafter defined) but not later than the Termination Date (as hereafter
defined), up to Thirty-Seven Thousand Five Hundred (37,500) shares of common
stock, $.01 par value ("Common Stock") of Chesapeake Energy Corporation, an
Oklahoma corporation (the "Company"), at the Purchase Price (as hereafter
defined) and on the terms and conditions herein set forth. The Purchase Price
and the number of shares of Common Stock purchasable are subject to adjustment
on the occurrence of certain contingencies set forth in this Option. On
presentation and surrender of this Option, together with payment of the Purchase
Price for the shares of Common Stock thereby purchased, at the office of the
Seller in Oklahoma City, Oklahoma, the registered Holder of this Option will be
entitled to receive a certificate or certificates for the shares of Common Stock
so purchased.

                  This Option is issued pursuant to the provisions of that
certain Loan Agreement dated effective March 10, 1999 (the "Loan Agreement"),
between the Seller and the Holder.

                  This Option is subject to the following terms and conditions:

1.       Exercise of Option. The right to purchase the Common Stock represented
by this Option is exercisable at the option of the Holder hereof: (a) for fifty
percent (50%) of the Option Shares (as hereinafter defined) in whole or in part
at any time prior to the Termination Date; and (b) in the event the Seller fails
to satisfy the terms of paragraph 6.2 of this Option on or before February 29,
2000 (the "Prepayment Date") for the remaining fifty percent (50%) of the Option
Shares in whole or in part at any time after the Prepayment Date and prior to
the Termination Date. This Option may be exercised by the delivery to the Seller
of written notice of the exercise of this

<PAGE>   2
                                                                   EXHIBIT 99.15


Option, surrender of this Option to the Seller and the payment of the Purchase
Price. The Purchase Price for the Option Shares may be paid: (a) in immediately
available funds of the United States of America; (b) by tendering to the Seller
an equivalent principal or accrued interest credit under the terms of the Loan
Agreement; or (c) by the Holder surrendering or assigning to the Seller the
rights to purchase the number of Option Shares under this Option, which are not
being exercised pursuant to such notice, with a value equal to the Purchase
Price. For purposes of the foregoing clause (c), value is deemed to be the
difference between the current market price per share of Common Stock and the
exercise price of the Option Shares for which the rights are being surrendered
by the Holder. In the case of the purchase of less than all the shares
purchasable under this Option, the Seller will cancel this Option on the
surrender hereof and will execute and deliver a new Option of like tenor for the
balance of the shares purchasable hereunder.

2.       Term. This Option may be exercised for up to fifty percent (50%) of the
Option Shares at any time after the date hereof and, if the conditions set forth
in paragraph 6.2 hereof are not met on or before the Prepayment Date, for one
hundred percent (100%) of the Option Shares at any time after the Prepayment
Date (the "Effective Date"), and on or before August 31, 2006 (the "Termination
Date"). If the Option to purchase all or part of the shares has not been
exercised prior to the Termination Date, this Option and all of the rights of
the Holder hereunder will expire and terminate on such date without notice by
the Seller.

3.       Purchase Price. On the exercise of this Option, the Holder agrees to
pay to the Seller for each share of Common Stock purchased by the Holder
pursuant to the terms of this Option (the "Option Shares") an amount (the
"Purchase Price") equal to fifty cents ($0.50). The Purchase Price and number of
shares will be subject to the adjustments set forth in paragraph 6 of this
Option.

4.       Representations and Warranties of the Seller. The Seller represents and
warrants to and agrees with the Holder as follows:

         4.1      Sufficient Shares. The Seller owns sufficient shares of Common
                  Stock to fulfill the Seller's obligations under this Option.
                  On exercise of this Option and payment of the Purchase Price,
                  the Option Shares issued to the Holder will be validly issued,
                  fully paid and nonassessable and free and clear of all liens,
                  claims and encumbrances.

         4.2      Authority. The Seller has taken all necessary action to
                  authorize the execution and delivery of this Option, the sales
                  of the shares of Common Stock upon exercise hereof, and this
                  Option is, or will be upon issuance, a valid, binding and
                  enforceable obligation of the Seller. The execution and
                  delivery of this Option will not violate: (a) any order, writ,
                  injunction or decree of any court, administrative agency or
                  governmental body applicable to the Seller or the Common
                  Stock; or (b) any contract, lease, note, bond, mortgage or
                  other agreement to which the Seller is a party, by which the
                  Seller is bound or to which any of the Seller's assets are
                  subject.

                                       -2-
<PAGE>   3

                                                                   EXHIBIT 99.15


5.       Representations and Warranties of the Holder. The Holder represents,
         warrants and agrees with the Seller and the Company as follows:

         5.1      Accredited Investor. The Holder meets all of the
                  qualifications and is an "accredited investor" as that term is
                  defined in Rule 501(a) of Regulation D promulgated pursuant to
                  the Securities Act of 1933 (the "Securities Act").

         5.2      Restrictive Legend. This Option is being acquired and any
                  Option Shares to be acquired by the Holder pursuant to this
                  Option (collectively, "Securities") will be acquired for
                  investment for the Holder's own account and not with a view
                  to, or for resale in connection with, any distribution of such
                  Securities within the meaning of the Securities Act. The
                  Securities will not be sold, transferred or otherwise disposed
                  of without registration under the Securities Act and state
                  securities laws or qualifications for exemptions therefrom.
                  The Holder agrees that each certificate representing the
                  Option Shares may be inscribed with a legend to the foregoing
                  effect, which legend will be as follows:

                           "The shares represented by this certificate have been
                           acquired solely for investment purposes and have not
                           been registered under the Securities Act of 1933, as
                           amended, or the securities laws of any state. The
                           shares may not be sold, transferred, assigned or
                           otherwise disposed of unless and until such shares
                           are first registered under the Securities Act of
                           1933, all applicable state securities laws and all
                           rules and regulations promulgated thereunder or
                           unless and until the holder hereof provides either
                           (i) information satisfactory to the Company that such
                           registration is not required or (ii) an opinion of
                           counsel acceptable to the Company to the effect that
                           such registration is not required."

                  The Holder agrees that the Company may place a stop transfer
                  order with the Company's transfer agent, if any, with respect
                  to any noncomplying transfer of the certificates representing
                  any such Common Stock, which stop transfer order will be
                  removed upon compliance with the provisions hereof.

6.       Adjustments. The Purchase Price and the number of shares of Common
         Stock issuable on exercise of this Option will be subject to adjustment
         as follows:

         6.1      Adjustment to Purchase Price. The Purchase Price pursuant to
                  which Common Stock may be acquired hereunder will be subject
                  to the adjustments herein set forth for transactions described
                  below which occur after the date of this Option.

                  6.1.1    Issuance of Common Stock. If at any time subsequent
                           to the date hereof the Company issues or sells any
                           shares of Common Stock for a consideration per share
                           of Common Stock less than the Purchase Price, the
                           Purchase Price for the shares of Common Stock which
                           remain to be purchased under this Option will be
                           reduced to the per share price received


                                      -3-
<PAGE>   4

                                                                   EXHIBIT 99.15


                           by the Company on such issue or sale. The adjustment
                           provided for in this paragraph will not be made as a
                           result of the issuance or purchase of any shares of
                           Common Stock reserved for issuance and subsequently
                           issued pursuant to any stock option plan for
                           employees of the Company or professional persons
                           retained by the Company in the ordinary course of the
                           Company's business.

                  6.1.2    Consideration for Stock. If any shares of Common
                           Stock are issued or sold by the Company for cash paid
                           or to be paid, the consideration received will be
                           deemed to be the amount received and to be received
                           by the Company for such shares of Common Stock. If
                           any shares of Common Stock are issued or sold by the
                           Company for consideration other than cash, the amount
                           of consideration will be the fair value of such
                           consideration received and to be received, as
                           determined in good faith by the Company's board of
                           directors. In determining consideration received by
                           the Company, expenses, underwriting commissions or
                           concessions paid or allowed by the Company will not
                           be deducted. If the Company distributes with respect
                           to the Common Stock shares of Common Stock, rights or
                           options to subscribe for or purchase shares of Common
                           Stock ("Options") or securities convertible into or
                           exchangeable for shares of Common Stock ("Convertible
                           Securities") and a Purchase Price adjustment is made
                           on the issuance of such Options or Convertible
                           Securities, then any share of Common Stock issuable
                           in satisfaction of such distribution, or in
                           connection with the exercise of the Options or in
                           connection with the conversion of the Convertible
                           Securities will be deemed issued or sold without
                           consideration but no additional adjustment to the
                           Purchase Price will be made by reason thereof.

         6.2      Share Adjustments. If, on or before February 29, 2000, the
                  loan made pursuant to the Loan Agreement is: (a) paid in full
                  with interest at ten percent (10%) per annum from January 1,
                  1999, until the date of payment; or (b) fully secured with
                  collateral acceptable to the Holder on or before February 29,
                  2000, as provided in paragraph 8 of the Loan Agreement, then
                  the number of shares of Common Stock covered by this Option
                  will decrease to Eighteen Thousand Seven Hundred Fifty
                  (18,750). In addition, the number of shares of Common Stock to
                  be issued pursuant to this Option will be adjusted (a) in the
                  event the Company issued any Options, Convertible Securities
                  or shares of Common Stock as a stock dividend, (b) issues any
                  shares of Common Stock by reclassification of its Common
                  Stock, or (c) subdivides or combines its Common Stock. The
                  shares of Common Stock to be conveyed pursuant to this Option
                  at the time of the effective date of such stock dividend,
                  subdivisions, combination or reclassification will be
                  adjusted, effective at the opening of business on the business
                  day next following such record date or effective date, so the
                  Holder will be entitled to receive the number of shares of
                  Common Stock which the Holder would have owned or been
                  entitled to receive had such shares of Common Stock been
                  converted immediately prior to such time.


                                      -4-

<PAGE>   5

                                                                   EXHIBIT 99.15


         6.3      Option Need Not be Changed to Reflect Adjustments.
                  Irrespective of any adjustment or change in the Purchase Price
                  or the number of shares of Common Stock actually purchasable
                  hereunder, this Option after issuance may continue to express
                  the Purchase Price per share and the number of shares
                  purchasable hereunder as if the adjusted Purchase Price per
                  share and the number of shares purchasable were expressed in
                  this Option when initially issued.

         6.4      Reorganization, Merger, Etc. If any capital reorganization,
                  recapitalization or reclassification of the capital stock of
                  the Company, a consolidation or merger of the Company with
                  another corporation or the sale or conveyance of all or
                  substantially all of the Company's assets to another
                  corporation is affected, the Holder will have the right to
                  purchase and receive on the basis, terms and conditions
                  specified in this Option such shares of stock, securities or
                  assets as may be issued or payable with respect to or in
                  exchange for Common Stock equal to the number of shares of
                  such Common Stock immediately theretofore purchasable and
                  receivable upon the exercise of this Option had the
                  reorganization, reclassification, recapitalization,
                  consolidation, merger, sale or conveyance not taken place. In
                  each such case, appropriate provisions will be made with
                  respect to the rights and interests of the Holder of this
                  Option to the end that the provisions hereof (including
                  without limitation provisions for adjustment of the Purchase
                  Price and of the number of shares purchasable upon the
                  exercise of this Option) will thereafter be applicable, as
                  nearly as may be practicable to any stock, securities or
                  assets to be acquired under this Option.

         6.5      Notice to Holder. On any adjustment of the Purchase Price or
                  an increase or decrease in the number of shares of Common
                  Stock purchasable on the exercise of this Option, the Seller
                  will, within thirty (30) days after such adjustment, give
                  written notice of such adjustment and the method of
                  calculating the adjustment and the facts (including a
                  statement of the consideration received or deemed to have been
                  received by the Company) on which such calculations are based.

         6.6      Record Date. If the Company sets a record date for the purpose
                  of entitling the holders of Common Stock to (a) receive a
                  dividend or other distribution payable in shares of Common
                  Stock, or (b) subscribe for or purchase shares of Common
                  Stock, then such record date will be deemed to be the date of
                  the issue or sale of the shares of Common Stock deemed to have
                  been issued or sold upon the declaration of such dividend or
                  the making of such other distribution or the date of the
                  granting of such right of subscription or purchase, as the
                  case may be.

         6.7      Treasury Shares. The number of shares of Common Stock
                  outstanding at any given time will not include shares owned or
                  held by or for the account of the Company, and the disposition
                  of any such shares will be considered an issue or sale of
                  shares of Common Stock for the purpose of this paragraph 6.

7.       Status of Holder. This Option does not entitle the Holder hereof to any
         voting rights or other rights as a shareholder of the Company.


                                      -5-
<PAGE>   6

                                                                   EXHIBIT 99.15


8.       No Fractional Shares. The Company will not be required to issue stock
         certificates representing fractions of shares of Common Stock.

9.       Cash Payment. The Seller will have the right to satisfy this Option in
         cash if as a result of continuing margin account liens or exercise of
         remedies by margin account lenders, the Seller does not possess
         sufficient shares of Common Stock on the date this Option is exercised
         or "in the money" exercisable options sufficient to satisfy the Option
         exercise.

10.      Notices. All notices, requests, consents and other communications
         hereunder will be in writing and will be deemed to have been made when
         delivered or when mailed first class postage prepaid or delivered to
         the telegraph office:

         (i)      if to the Holder of this Option, at the address of the Holder
                  as set forth below the Holder's signature hereon, or at such
                  other address as may have been furnished to the Seller in
                  writing by the Holder; or

         (ii)     if to the Seller, 6100 North Western, Oklahoma City, Oklahoma
                  73118, or at such other address as may have been furnished to
                  the Holder in writing by the Seller.

11.      Headings. The headings of the paragraphs of this Option are inserted
         for convenience only and will not be deemed to constitute a part of
         this Option.

12.      Governing Law. This Option is being delivered and is intended to be
         performed in the State of Oklahoma and will be construed and enforced
         in accordance with, and the rights of the parties shall be governed by,
         the law of such state.

13.      Assignment. Subject to the conditions set forth herein, this Option and
         all rights hereunder are transferable by the Holder, in whole or in
         part.

                  IN WITNESS WHEREOF, this Option has been executed effective
the 10th day of March, 1999.


                                        /s/ Aubrey K. McClendon
                                        ----------------------------------------
                                        AUBREY K. McCLENDON, individually

                                        (the "Seller")

                                        /s/ Shannon Self
                                        ----------------------------------------
                                        SHANNON SELF, individually
                                        Post Office Box 61091
                                        Oklahoma City, Oklahoma 73146

                                        (the "Holder")


                                      -6-

<PAGE>   1
                                                                   EXHIBIT 99.16



THIS OPTION AND THE COMMON STOCK TO BE CONVEYED PURSUANT TO THIS OPTION HAVE
NOT BEEN REGISTERED UNDER ANY FEDERAL OR STATE SECURITIES LAWS. THIS OPTION AND
THE COMMON STOCK TO BE CONVEYED PURSUANT TO THIS OPTION MAY NOT BE SOLD,
TRANSFERRED, ASSIGNED OR OTHERWISE DISPOSED OF WITHOUT REGISTRATION UNDER THE
SECURITIES ACT OF 1933, ANY APPLICABLE STATE SECURITIES LAWS AND ANY APPLICABLE
BLUE SKY ACTS, UNLESS AND UNTIL THE HOLDER HEREOF COMPLIES WITH THE PROVISIONS
OF THIS OPTION AND PROVIDES (i) INFORMATION SATISFACTORY TO THE SELLER AND THE
COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED OR (ii) AN OPINION OF COUNSEL
ACCEPTABLE TO THE SELLER AND THE COMPANY THAT SUCH REGISTRATION IS NOT
REQUIRED.


                          COMMON STOCK PURCHASE OPTION


No. AKM-3               For the Purchase of 93,750 Shares of Common Stock
                        of Chesapeake Energy Corporation


                  FOR VALUE RECEIVED, TALBOT FAIRFIELD II LIMITED PARTNERSHIP
(the "Holder"), is hereby granted the right (the "Option") to purchase from
AUBREY K. McCLENDON, an individual (the "Seller"), at any time after the
Effective Date (as hereafter defined) but not later than the Termination Date
(as hereafter defined), up to Ninety-Three Thousand Seven Hundred Fifty
(93,750) shares of common stock, $.01 par value ("Common Stock") of Chesapeake
Energy Corporation, an Oklahoma corporation (the "Company"), at the Purchase
Price (as hereafter defined) and on the terms and conditions herein set forth.
The Purchase Price and the number of shares of Common Stock purchasable are
subject to adjustment on the occurrence of certain contingencies set forth in
this Option. On presentation and surrender of this Option, together with
payment of the Purchase Price for the shares of Common Stock thereby purchased,
at the office of the Seller in Oklahoma City, Oklahoma, the registered Holder
of this Option will be entitled to receive a certificate or certificates for
the shares of Common Stock so purchased.

                  This Option is issued pursuant to the provisions of that
certain Amended and Restated Loan Agreement dated effective September 1, 1999
(the "Loan Agreement"), between the Seller and the Holder.

                  This Option is subject to the following terms and conditions:

1. Exercise of Option. The right to purchase the Common Stock represented by
this Option is exercisable at the option of the Holder hereof: (a) for fifty
percent (50%) of the Option Shares (as hereinafter defined) in whole or in part
at any time prior to the Termination Date; and (b) in the event the Seller
fails to satisfy the terms of paragraph 6.2 of this Option on or before
February 29, 2000 (the "Prepayment Date") for the remaining fifty percent (50%)
of the Option Shares in

<PAGE>   2

                                                                  EXHIBIT 99.16



whole or in part at any time after the Prepayment Date and prior to the
Termination Date. This Option may be exercised by the delivery to the Seller of
written notice of the exercise of this Option, surrender of this Option to the
Seller and the payment of the Purchase Price. The Purchase Price for the Option
Shares may be paid: (a) in immediately available funds of the United States of
America; (b) by tendering to the Seller an equivalent principal or accrued
interest credit under the terms of the Loan Agreement; or (c) by the Holder
surrendering or assigning to the Seller the rights to purchase the number of
Option Shares under this Option, which are not being exercised pursuant to such
notice, with a value equal to the Purchase Price. For purposes of the foregoing
clause (c), value is deemed to be the difference between the current market
price per share of Common Stock and the exercise price of the Option Shares for
which the rights are being surrendered by the Holder. In the case of the
purchase of less than all the shares purchasable under this Option, the Seller
will cancel this Option on the surrender hereof and will execute and deliver a
new Option of like tenor for the balance of the shares purchasable hereunder.

2. Term. This Option may be exercised for up to fifty percent (50%) of the
Option Shares at any time after the date hereof and, if the conditions set
forth in paragraph 6.2 hereof are not met on or before the Prepayment Date, for
one hundred percent (100%) of the Option Shares at any time after the
Prepayment Date (the "Effective Date"), and on or before August 31, 2006 (the
"Termination Date"). If the Option to purchase all or part of the shares has
not been exercised prior to the Termination Date, this Option and all of the
rights of the Holder hereunder will expire and terminate on such date without
notice by the Seller.

3. Purchase Price. On the exercise of this Option, the Holder agrees to pay to
the Seller for each share of Common Stock purchased by the Holder pursuant to
the terms of this Option (the "Option Shares") an amount (the "Purchase Price")
equal to fifty cents ($0.50). The Purchase Price and number of shares will be
subject to the adjustments set forth in paragraph 6 of this Option.

4. Representations and Warranties of the Seller. The Seller represents and
warrants to and agrees with the Holder as follows:

         4.1      Sufficient Shares. The Seller owns sufficient shares of
                  Common Stock to fulfill the Seller's obligations under this
                  Option. On exercise of this Option and payment of the
                  Purchase Price, the Option Shares issued to the Holder will
                  be validly issued, fully paid and nonassessable and free and
                  clear of all liens, claims and encumbrances.

         4.2      Authority. The Seller has taken all necessary action to
                  authorize the execution and delivery of this Option, the
                  sales of the shares of Common Stock upon exercise hereof, and
                  this Option is, or will be upon issuance, a valid, binding
                  and enforceable obligation of the Seller. The execution and
                  delivery of this Option will not violate: (a) any order,
                  writ, injunction or decree of any court, administrative
                  agency or governmental body applicable to the Seller or the
                  Common Stock; or (b) any contract, lease, note, bond,
                  mortgage or other agreement to which the Seller is a party,
                  by which the Seller is bound or to which any of the Seller's
                  assets are subject.


                                     - 2 -
<PAGE>   3

                                                                  EXHIBIT 99.16


5. Representations and Warranties of the Holder. The Holder represents,
warrants and agrees with the Seller and the Company as follows:

         5.1      Accredited Investor. The Holder meets all of the
                  qualifications and is an "accredited investor" as that term
                  is defined in Rule 501(a) of Regulation D promulgated
                  pursuant to the Securities Act of 1933 (the "Securities
                  Act").

         5.2      Restrictive Legend. This Option is being acquired and any
                  Option Shares to be acquired by the Holder pursuant to this
                  Option (collectively, "Securities") will be acquired for
                  investment for the Holder's own account and not with a view
                  to, or for resale in connection with, any distribution of
                  such Securities within the meaning of the Securities Act. The
                  Securities will not be sold, transferred or otherwise
                  disposed of without registration under the Securities Act and
                  state securities laws or qualifications for exemptions
                  therefrom. The Holder agrees that each certificate
                  representing the Option Shares may be inscribed with a legend
                  to the foregoing effect, which legend will be as follows:

                           "The shares represented by this certificate have
                           been acquired solely for investment purposes and
                           have not been registered under the Securities Act of
                           1933, as amended, or the securities laws of any
                           state. The shares may not be sold, transferred,
                           assigned or otherwise disposed of unless and until
                           such shares are first registered under the
                           Securities Act of 1933, all applicable state
                           securities laws and all rules and regulations
                           promulgated thereunder or unless and until the
                           holder hereof provides either (i) information
                           satisfactory to the Company that such registration
                           is not required or (ii) an opinion of counsel
                           acceptable to the Company to the effect that such
                           registration is not required."

                  The Holder agrees that the Company may place a stop transfer
                  order with the Company's transfer agent, if any, with respect
                  to any noncomplying transfer of the certificates representing
                  any such Common Stock, which stop transfer order will be
                  removed upon compliance with the provisions hereof.

6. Adjustments. The Purchase Price and the number of shares of Common Stock
issuable on exercise of this Option will be subject to adjustment as follows:

         6.1      Adjustment to Purchase Price. The Purchase Price pursuant to
                  which Common Stock may be acquired hereunder will be subject
                  to the adjustments herein set forth for transactions
                  described below which occur after the date of this Option.

                  6.1.1    Issuance of Common Stock. If at any time subsequent
                           to the date hereof the Company issues or sells any
                           shares of Common Stock for a consideration per share
                           of Common Stock less than the Purchase Price, the
                           Purchase Price for the shares of Common Stock which
                           remain to be purchased under this Option will be
                           reduced to the per share price received


                                     - 3 -
<PAGE>   4

                                                                  EXHIBIT 99.16


                           by the Company on such issue or sale. The adjustment
                           provided for in this paragraph will not be made as a
                           result of the issuance or purchase of any shares of
                           Common Stock reserved for issuance and subsequently
                           issued pursuant to any stock option plan for
                           employees of the Company or professional persons
                           retained by the Company in the ordinary course of
                           the Company's business.

                  6.1.2    Consideration for Stock. If any shares of Common
                           Stock are issued or sold by the Company for cash
                           paid or to be paid, the consideration received will
                           be deemed to be the amount received and to be
                           received by the Company for such shares of Common
                           Stock. If any shares of Common Stock are issued or
                           sold by the Company for consideration other than
                           cash, the amount of consideration will be the fair
                           value of such consideration received and to be
                           received, as determined in good faith by the
                           Company's board of directors. In determining
                           consideration received by the Company, expenses,
                           underwriting commissions or concessions paid or
                           allowed by the Company will not be deducted. If the
                           Company distributes with respect to the Common Stock
                           shares of Common Stock, rights or options to
                           subscribe for or purchase shares of Common Stock
                           ("Options") or securities convertible into or
                           exchangeable for shares of Common Stock
                           ("Convertible Securities") and a Purchase Price
                           adjustment is made on the issuance of such Options
                           or Convertible Securities, then any share of Common
                           Stock issuable in satisfaction of such distribution,
                           or in connection with the exercise of the Options or
                           in connection with the conversion of the Convertible
                           Securities will be deemed issued or sold without
                           consideration but no additional adjustment to the
                           Purchase Price will be made by reason thereof.

         6.2      Share Adjustments. If, on or before February 29, 2000, the
                  loan made pursuant to the Loan Agreement is: (a) paid in full
                  with interest at ten percent (10%) per annum from September
                  1, 1999, until the date of payment; or (b) fully secured with
                  collateral acceptable to the Holder on or before February 29,
                  2000, as provided in paragraph 8 of the Loan Agreement, then
                  the number of shares of Common Stock covered by this Option
                  will decrease to Forty-Six Thousand Eight Hundred
                  Seventy-Five (46,875). In addition, the number of shares of
                  Common Stock to be issued pursuant to this Option will be
                  adjusted (a) in the event the Company issued any Options,
                  Convertible Securities or shares of Common Stock as a stock
                  dividend, (b) issues any shares of Common Stock by
                  reclassification of its Common Stock, or (c) subdivides or
                  combines its Common Stock. The shares of Common Stock to be
                  conveyed pursuant to this Option at the time of the effective
                  date of such stock dividend, subdivisions, combination or
                  reclassification will be adjusted, effective at the opening
                  of business on the business day next following such record
                  date or effective date, so the Holder will be entitled to
                  receive the number of shares of Common Stock which the Holder
                  would have owned or been entitled to receive had such shares
                  of Common Stock been converted immediately prior to such
                  time.


                                     - 4 -
<PAGE>   5

                                                                  EXHIBIT 99.16



         6.3      Option Need Not be Changed to Reflect Adjustments.
                  Irrespective of any adjustment or change in the Purchase
                  Price or the number of shares of Common Stock actually
                  purchasable hereunder, this Option after issuance may
                  continue to express the Purchase Price per share and the
                  number of shares purchasable hereunder as if the adjusted
                  Purchase Price per share and the number of shares purchasable
                  were expressed in this Option when initially issued.

         6.4      Reorganization, Merger, Etc. If any capital reorganization,
                  recapitalization or reclassification of the capital stock of
                  the Company, a consolidation or merger of the Company with
                  another corporation or the sale or conveyance of all or
                  substantially all of the Company's assets to another
                  corporation is affected, the Holder will have the right to
                  purchase and receive on the basis, terms and conditions
                  specified in this Option such shares of stock, securities or
                  assets as may be issued or payable with respect to or in
                  exchange for Common Stock equal to the number of shares of
                  such Common Stock immediately theretofore purchasable and
                  receivable upon the exercise of this Option had the
                  reorganization, reclassification, recapitalization,
                  consolidation, merger, sale or conveyance not taken place. In
                  each such case, appropriate provisions will be made with
                  respect to the rights and interests of the Holder of this
                  Option to the end that the provisions hereof (including
                  without limitation provisions for adjustment of the Purchase
                  Price and of the number of shares purchasable upon the
                  exercise of this Option) will thereafter be applicable, as
                  nearly as may be practicable to any stock, securities or
                  assets to be acquired under this Option.

         6.5      Notice to Holder. On any adjustment of the Purchase Price or
                  an increase or decrease in the number of shares of Common
                  Stock purchasable on the exercise of this Option, the Seller
                  will, within thirty (30) days after such adjustment, give
                  written notice of such adjustment and the method of
                  calculating the adjustment and the facts (including a
                  statement of the consideration received or deemed to have
                  been received by the Company) on which such calculations are
                  based.

         6.6      Record Date. If the Company sets a record date for the
                  purpose of entitling the holders of Common Stock to (a)
                  receive a dividend or other distribution payable in shares of
                  Common Stock, or (b) subscribe for or purchase shares of
                  Common Stock, then such record date will be deemed to be the
                  date of the issue or sale of the shares of Common Stock
                  deemed to have been issued or sold upon the declaration of
                  such dividend or the making of such other distribution or the
                  date of the granting of such right of subscription or
                  purchase, as the case may be.

         6.7      Treasury Shares. The number of shares of Common Stock
                  outstanding at any given time will not include shares owned
                  or held by or for the account of the Company, and the
                  disposition of any such shares will be considered an issue or
                  sale of shares of Common Stock for the purpose of this
                  paragraph 6.

7. Status of Holder. This Option does not entitle the Holder hereof to any
voting rights or other rights as a shareholder of the Company.


                                     - 5 -
<PAGE>   6

                                                                  EXHIBIT 99.16



8. No Fractional Shares. The Company will not be required to issue stock
certificates representing fractions of shares of Common Stock.

9. Cash Payment. The Seller will have the right to satisfy this Option in cash
if as a result of continuing margin account liens or exercise of remedies by
margin account lenders, the Seller does not possess sufficient shares of Common
Stock on the date this Option is exercised or "in the money" exercisable
options sufficient to satisfy the Option exercise.

10. Notices. All notices, requests, consents and other communications hereunder
will be in writing and will be deemed to have been made when delivered or when
mailed first class postage prepaid or delivered to the telegraph office:

         (i)      if to the Holder of this Option, at the address of the Holder
                  as set forth below the Holder's signature hereon, or at such
                  other address as may have been furnished to the Seller in
                  writing by the Holder; or

         (ii)     if to the Seller, 6100 North Western, Oklahoma City, Oklahoma
                  73118, or at such other address as may have been furnished to
                  the Holder in writing by the Seller.

11. Headings. The headings of the paragraphs of this Option are inserted for
convenience only and will not be deemed to constitute a part of this Option.

12. Governing Law. This Option is being delivered and is intended to be
performed in the State of Oklahoma and will be construed and enforced in
accordance with, and the rights of the parties shall be governed by, the law of
such state.

13. Assignment. Subject to the conditions set forth herein, this Option and all
rights hereunder are transferable by the Holder, in whole or in part.

                  IN WITNESS WHEREOF, this Option has been executed effective
the 1st day of September, 1999.

                                    /s/ Aubrey K. McClendon
                                   ------------------------------------
                                   AUBREY K. McCLENDON, individually

                                   (the "Seller")

                                   TALBOT FAIRFIELD II LIMITED
                                   PARTNERSHIP

                                   By /s/ Breene M. Kerr
                                      ----------------------------------
                                      Breene M. Kerr, General Partner
                                       115 Bay Street
                                       Easton, Maryland 21601

                                   (the "Holder")


                                     - 6 -

<PAGE>   1
                                                                   EXHIBIT 99.17

                             JOINT FILING AGREEMENT

                  In accordance with Rule 13d-1(f) under the Securities Exchange
Act of 1934, as amended, the undersigned hereby agree to the joint filing with
each other of the attached statement on Schedule 13D and to all amendments to
such statement and that such statement and all amendments to such statement are
made on behalf of each of them.

                  IN WITNESS WHEREOF, the undersigned hereby execute this
agreement on December 16, 1999.



                                  /s/ Aubrey K. McClendon
                                  ----------------------------------------------
                                  AUBREY K. McCLENDON, an individual


                                  CHESAPEAKE INVESTMENTS, an Oklahoma
                                  Limited Partnership

                                  By /s/ Aubrey K. McClendon
                                     -------------------------------------------
                                     Aubrey K. McClendon, General Partner



                                  /s/ Tom L. Ward
                                  ----------------------------------------------
                                  TOM L. WARD, an individual


                                  TLW INVESTMENTS INC., an Oklahoma
                                  corporation

                                  By /s/ Tom L. Ward
                                     -------------------------------------------
                                     Tom L. Ward, President



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