CHESAPEAKE ENERGY CORP
S-3, 1998-06-19
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 19, 1998
 
                                                    REGISTRATION NO. 333-
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ---------------------
                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
                         CHESAPEAKE ENERGY CORPORATION
 
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                              <C>                              <C>
            OKLAHOMA                           1311                          73-1395733
(State or other jurisdiction of    (Primary Standard Industrial           (I.R.S. Employer
 incorporation or organization)    Classification Code Number)          Identification No.)
           6100 NORTH WESTERN AVENUE                           AUBREY K. MCCLENDON
         OKLAHOMA CITY, OKLAHOMA 73118                      6100 NORTH WESTERN AVENUE
                 (405) 848-8000                           OKLAHOMA CITY, OKLAHOMA 73118
  (Address, including Zip Code, and telephone                     (405) 848-8000
  number, including area code, of registrant's       (Name, address, including Zip Code, and
          principal executive offices)                telephone number, including area code,
                                                              of agent for service)
</TABLE>
 
                             ---------------------
                                   Copies to:
                             THEODORE M. ELAM, ESQ.
                            CONNIE S. STAMETS, ESQ.
                    MCAFEE & TAFT A PROFESSIONAL CORPORATION
                       TENTH FLOOR, TWO LEADERSHIP SQUARE
                               211 NORTH ROBINSON
                         OKLAHOMA CITY, OKLAHOMA 73102
                                 (405) 235-9621
                             ---------------------
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF THE SECURITIES TO THE
PUBLIC: From time to time after the effective date of this Registration
Statement.
     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box:  [ ]
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box:  [X]
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [ ]
- ------------------
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering:  [ ]
- ------------------
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
check the following box:  [ ]
                             ---------------------
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------
                                                             PROPOSED MAXIMUM     PROPOSED MAXIMUM
      TITLE OF EACH CLASS OF            AMOUNT TO BE          OFFERING PRICE         AGGREGATE            AMOUNT OF
   SECURITIES TO BE REGISTERED          REGISTERED(1)          PER UNIT(2)       OFFERING PRICE(2)    REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                     <C>                  <C>                  <C>
7% Cumulative Convertible
  Preferred Stock, $.01 par
  value...........................    4,600,000 Shares            $50.00            $230,000,000           $67,850
- ------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value......    33,093,525 Shares            N/A                  N/A                  N/A
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) This Registration Statement relates to the offering from time to time of an
    aggregate of (i) 4,600,000 shares of the Registrant's 7% Cumulative
    Convertible Preferred Stock, par value $.01 per share and liquidation
    preference $50 per share ("Preferred Stock"), together with such
    indeterminate number of shares of Preferred Stock as may be issuable in
    respect of such shares in connection with stock splits, stock dividends and
    similar transactions ("Additional Preferred Stock"), (ii) 33,093,525 shares
    of the Registrant's Common Stock, par value $.01 per share ("Common Stock"),
    into which the 4,600,000 shares of Preferred Stock may initially be
    converted or for which they may be redeemed and (iii) such indeterminate
    number of shares of the Registrant's Common Stock into which such Additional
    Preferred Stock may be converted or for which it may be redeemed, together
    with such indeterminate number of shares of Common Stock as may be issuable
    in respect of such Common Stock in connection with stock splits, stock
    dividends and similar transactions, all as offered by the Selling
    Shareholders described herein.
(2) Calculated in accordance with Rule 457(i) under the Securities Act of 1933,
    based on the liquidation preference of the Preferred Stock.
                             ---------------------
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
================================================================================
<PAGE>   2
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
PRELIMINARY PROSPECTUS SUBJECT TO COMPLETION, ISSUED JUNE 19, 1998.
 
                         CHESAPEAKE ENERGY CORPORATION
                              4,600,000 SHARES OF
                   7% CUMULATIVE CONVERTIBLE PREFERRED STOCK
            PAR VALUE $.01 AND LIQUIDATION PREFERENCE $50 PER SHARE
                                      AND
                              33,093,525 SHARES OF
                    COMMON STOCK, PAR VALUE $.01 PER SHARE,
                            ISSUABLE UPON CONVERSION
 
    This Prospectus relates to the resale of 4,600,000 shares of 7% Cumulative
Convertible Preferred Stock, par value $.01 and liquidation preference $50 per
share ("Preferred Stock"), of Chesapeake Energy Corporation, an Oklahoma
corporation ("Chesapeake" or the "Company"), issued to the initial purchasers of
the Preferred Stock (the "Initial Purchasers") in a private placement
consummated on April 22, 1998 and the resale of up to 33,093,525 shares of the
Company's Common Stock, par value $.01 per share ("Common Stock"), which are
initially issuable upon conversion of the Preferred Stock by any holders of the
Preferred Stock that did not purchase the Preferred Stock under this Prospectus.
The Preferred Stock and such shares of Common Stock issued upon conversion of
the Preferred Stock (collectively, the "Shares") may be offered from time to
time for the accounts of holders of Preferred Stock named herein or in
supplements to this Prospectus (the "Selling Shareholders"). See "Plan of
Distribution." Information concerning the Selling Shareholders may change from
time to time and will be set forth in supplements to this Prospectus.
 
    Dividends on the Preferred Stock are cumulative from the date of issuance
and payable quarterly in cash, in arrears, commencing August 1, 1998. Each share
of Preferred Stock is convertible at the holder's option, exercisable at any
time unless previously redeemed, into fully paid and nonassessable shares of
Common Stock, at a conversion price of $6.95 of liquidation preference per share
plus accrued but unpaid dividends, if any (equivalent to an initial conversion
rate of approximately 7.1942 shares of Common Stock for each share of Preferred
Stock), subject to adjustment under certain conditions as described herein. See
"Description of Preferred Stock -- Dividends" and "-- Conversion Rights."
 
    The Preferred Stock is redeemable at any time on or after May 1, 2001, in
whole or in part, at the option of the Company, initially at a price of $52.45
per share and thereafter at prices declining to $50 per share on or after May 1,
2008, plus in each case all accrued and unpaid dividends to the redemption date,
which redemption price may be paid in cash, by delivery of shares of Common
Stock or through a combination thereof. Upon any Change of Control (as defined
herein), each holder of Preferred Stock shall, in the event that the Market
Value (as defined herein) at such time is less than the Conversion Price, have a
one-time option to convert such holder's shares of Preferred Stock into fully
paid and nonassessable shares of Common Stock, at an adjusted Conversion Price
equal to the greater of (x) the Market Value for the period ending on the Change
of Control Date (as defined herein) and (y) $2.83 (being 66 2/3% of the Market
Value for the period ended April 16, 1998). In lieu of issuing shares of Common
Stock for shares of Preferred Stock surrendered for conversion upon a Change of
Control, the Company may, at its option, make a cash payment equal to the Market
Value determined for the period ending on the Change of Control Date of the
Common Stock otherwise issuable. See "Description of Preferred Stock -- Optional
Redemption" and "-- Change of Control."
                             ---------------------
 
      SEE "RISK FACTORS" BEGINNING ON PAGE 7 FOR A DESCRIPTION OF CERTAIN RISKS
THAT SHOULD BE CONSIDERED IN CONNECTION WITH AN INVESTMENT IN THE SHARES.
                             ---------------------
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
                             ---------------------
 
    On June 18, 1998, the last reported sale price of the Common Stock (symbol
"CHK") on the New York Stock Exchange ("NYSE") was $4.13 per share. The
Preferred Stock is eligible for trading in the Private Offerings, Resales and
Trading through Automated Linkages ("PORTAL") Market.
 
    All of the Preferred Stock was issued initially pursuant to an exemption
from the registration requirements of the Securities Act of 1933, as amended
(the "Securities Act"), provided by Section 4(2) thereof and, to the Company's
knowledge, was transferred to the Selling Shareholders pursuant to Rule 144A
under the Securities Act of 1933, as amended (the "Securities Act"). Preferred
Stock resold pursuant to this Prospectus will no longer be eligible for trading
in the PORTAL market.
 
    The Selling Shareholders, acting as principals for their own account,
directly, through agents designated from time to time, or through brokers,
dealers, agents or underwriters also to be designated, may sell all or a portion
of the Shares which may be offered hereby by them from time to time on terms to
be determined at the time of sale. The aggregate proceeds to the Selling
Shareholders from the sale of Shares which may be offered hereby by the Selling
Shareholders will be the purchase price of such Shares less commissions, if any.
The Company will not receive any proceeds from the sale of the Shares. For
information concerning indemnification arrangements between the Company and the
Selling Shareholders, see "Plan of Distribution."
 
    The Selling Shareholders and any brokers, dealers, agents or underwriters
that participate with the Selling Shareholders in the distribution of the Shares
may be deemed to be "underwriters" within the meaning of the Securities Act, in
which event any commissions received by such broker-dealers, agents or
underwriters and any profit on the resale of the Shares purchased by them may be
deemed to be underwriting commissions or discounts under the Securities Act.
PERSONS EFFECTING SALES OF SHARES PURSUANT TO THIS PROSPECTUS SHOULD CAREFULLY
REVIEW THE RESTRICTIONS ON THE USE HEREOF AND THE MANNER OF SELLING DESCRIBED IN
"PLAN OF DISTRIBUTION."
 
    The Company intends that the Registration Statement of which this Prospectus
is a part will remain effective until           , 2000 or such earlier date as
of which the Registration Statement is no longer required for the transfer of
the Shares. The Company has agreed to bear certain expenses in connection with
the registration and sale of the Shares being offered by the Selling
Shareholders.
 
               THE DATE OF THIS PROSPECTUS IS             , 1998
<PAGE>   3
 
                             AVAILABLE INFORMATION
 
     The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-3 (the "Registration
Statement," which term shall include all amendments, exhibits, annexes and
schedules thereto) pursuant to the Securities Act, and the rules and regulations
promulgated thereunder, covering the Shares being offered hereby. This
Prospectus does not contain all the information set forth in the Registration
Statement, certain parts of which are omitted in accordance with the rules and
regulations of the Commission. Statements made or incorporated by reference in
this Prospectus as to the contents of any contract, agreement or other document
referred to are not necessarily complete. With respect to each such contract,
agreement or other document filed as an exhibit to the Registration Statement or
to any other report incorporated by reference in this Prospectus, reference is
made to the exhibit for a more complete description of the matter involved, and
each such statement shall be deemed qualified in its entirety by such reference.
 
     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Commission. Such reports, proxy statements and other information filed by the
Company may be inspected and copied at the public reference facilities
maintained by the Commission at 450 Fifth Street, N.W., Judiciary Plaza,
Washington, D.C. 20549 and at the following regional offices of the Commission:
7 World Trade Center, New York, New York 10048 and 500 West Madison Street,
Chicago, Illinois 60661. Copies of such material can also be obtained from the
Public Reference Section of the Commission at 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549, at prescribed rates. The Company's Common Stock
is listed on the New York Stock Exchange. The Company's reports, proxy
statements and other information concerning the Company can be inspected and
copied at the offices of the New York Stock Exchange, 20 Broad Street, New York,
New York 10005. Such material may also be accessed electronically by means of
the Commission's home page on the Internet at http://www.sec.gov.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents filed by the Company with the Commission (File No.
1-13726) pursuant to the Exchange Act are incorporated herein by reference:
 
          1. Annual Report on Form 10-K for the fiscal year ended June 30, 1997
     and Transition Report for the six months ended December 31, 1997;
 
          2. Quarterly Report on Form 10-Q for the quarter ended March 31, 1998;
 
          3. Current Reports on Form 8-K filed on January 15 and 26, February 5
     and 13, March 5, 20, 23, 25 and 26, April 17 and 22, and May 20, 21, 22 and
     26, 1998; and
 
          4. the description of the Company's Common Stock contained in its
     registration statement on Form 8-B dated December 11, 1996 and any
     amendment or report filed for the purpose of updating such description.
 
     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of the offering described herein shall be deemed to be
incorporated in this Prospectus and to be a part hereof from the date of the
filing of such document. Any statement contained in a document incorporated by
reference herein shall be deemed to be modified or superseded for all purposes
to the extent that a statement contained in this Prospectus, or in any other
subsequently filed document which is also incorporated or deemed to be
incorporated by reference, modifies or supersedes such statement. Any statement
so modified or superseded shall not be deemed, except as so modified or
superseded, to constitute a part of this Prospectus.
 
     The Company will provide without charge to each person to whom this
Prospectus is delivered, upon written or oral request of such person, a copy
(without exhibits unless such exhibits are specifically incorporated by
reference into such document) of any or all documents incorporated by reference
in this
 
                                        2
<PAGE>   4
 
Prospectus. Requests for such copies should be directed to Janice A. Dobbs,
Corporate Secretary, Chesapeake Energy Corporation, 6100 North Western Avenue,
Oklahoma City, Oklahoma 73118, by mail, and if by telephone, (405) 879-9212.
 
                           FORWARD-LOOKING STATEMENTS
 
     This Prospectus includes and certain of the documents incorporated by
reference into this Prospectus include "forward-looking statements" within the
meaning of Section 27A of the Securities Act and Section 21E of the Exchange
Act. All statements other than statements of historical facts included or
incorporated by reference in this Prospectus are forward-looking statements.
Although the Company believes that the expectations reflected in such
forward-looking statements are reasonable, it can give no assurance that such
expectations will prove to have been correct. The Company cautions prospective
investors that actual results could differ materially from those expected by the
Company, depending on the outcome of certain factors, including, without
limitation, factors discussed under "Risk Factors" such as the Company's ability
to pay cash dividends on the Preferred Stock, concentration of unevaluated
leasehold in Louisiana, impairment of asset value, acquisition and integration
of operations risks, need to replace reserves, substantial capital requirements,
restrictions imposed by lenders, substantial indebtedness, patent and securities
litigation, fluctuations in the prices of oil and gas, hedging risks,
uncertainties inherent in estimating quantities of oil and gas reserves and
projecting future rates of production and timing of development expenditures,
operating risks, the effects of governmental and environmental regulation,
competition, and liquidity and capital requirements. Readers are cautioned not
to place undue reliance on these forward-looking statements, which speak only as
of the respective dates on which they are issued. The Company undertakes no
obligation to release publicly the result of any revisions to forward-looking
statements that may be made to reflect events or circumstances after the date
hereof, including, without limitation, changes in the Company's business
strategy or planned capital expenditures, or to reflect the occurrence of
unanticipated events.
 
                                        3
<PAGE>   5
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by and should be read in
conjunction with the more detailed information included elsewhere or
incorporated by reference in this Prospectus. Prospective purchasers are urged
to read this Prospectus and the documents incorporated herein by reference.
Prospective purchasers should carefully consider the information set forth in
"Risk Factors" in evaluating an investment in the Shares. Unless the context
otherwise requires, all references in this Prospectus to "Chesapeake" or the
"Company" are to Chesapeake Energy Corporation and its subsidiaries. All
references in this Prospectus to fiscal years ended on or prior to June 30, 1997
are to the Company's fiscal year ended June 30. The Company has changed its
fiscal year end from June 30 to December 31 and has included and incorporated by
reference herein information for the transition period from July 1 to December
31, 1997.
 
                                  THE COMPANY
 
     Chesapeake Energy Corporation is an independent oil and gas company engaged
in the acquisition, development, production and exploration of oil and natural
gas in major onshore producing areas of the United States and Canada. The
Company's strategy is to pursue growth through a balance of drilling and
acquisitions. The Company's assets are concentrated in three core areas: the
Mid-Continent (consisting of Oklahoma, southwestern Kansas and the Texas
Panhandle), the Austin Chalk Trend in Texas and Louisiana, and western Canada.
The Company's principal executive offices are located at 6100 North Western
Avenue, Oklahoma City, Oklahoma 73118 and its telephone number is (405)
848-8000.
 
                                  THE OFFERING
 
SECURITIES OFFERED.........  4,600,000 shares of 7% Cumulative Convertible
                             Preferred Stock, together with such indeterminate
                             number of shares of Preferred Stock as may be
                             issuable in respect of such shares in connection
                             with stock splits, stock dividends and similar
                             transactions, and the shares of Common Stock into
                             which such Preferred Stock may be converted,
                             together with such indeterminate number of shares
                             of Common Stock which may be issuable in respect of
                             such shares in connection with stock splits, stock
                             dividends and similar transactions.
 
                                PREFERRED STOCK
 
DIVIDENDS..................  Cumulative annual dividends of $3.50 per share
                             payable quarterly in cash on each February 1, May
                             1, August 1 and November 1, commencing August 1,
                             1998, when, as and if declared by the Board of
                             Directors. Dividends on the Preferred Stock will
                             accrue and be cumulative from the date of issuance
                             thereof. See "Description of Preferred Stock --
                             Dividends."
 
LIQUIDATION PREFERENCE.....  $50 per share, plus accrued and unpaid dividends.
 
RANKING....................  The Preferred Stock ranks (i) senior to all of the
                             Company's Common Stock and to all other capital
                             stock of the Company unless the terms of such stock
                             expressly provide that it ranks senior to or on a
                             parity with the Preferred Stock; (ii) on a parity
                             with any capital stock of the Company the terms of
                             which expressly provide that it will rank on a
                             parity with the Preferred Stock; and (iii) junior
                             to all capital stock of the Company the terms of
                             which expressly provide that such stock will rank
                             senior to the Preferred Stock. As of the date of
                             this Prospectus, all outstanding capital stock of
                             the Company ranks junior to the Preferred Stock.
                             See "Description of Preferred Stock -- General."
 
                                        4
<PAGE>   6
 
OPTIONAL REDEMPTION........  The Preferred Stock may not be redeemed prior to
                             May 1, 2001. On or after May 1, 2001, the Preferred
                             Stock may be redeemed, at any time at the option of
                             the Company, in whole or in part, in cash, shares
                             of Common Stock or a combination thereof, initially
                             at the redemption price of $52.45 per share and
                             thereafter at prices declining to $50 per share on
                             or after May 1, 2008, plus, in each case, accrued
                             and unpaid dividends to the redemption date. See
                             "Description of Preferred Stock -- Optional
                             Redemption."
 
CONVERSION RIGHTS..........  Each share of Preferred Stock may be converted at
                             any time, at the option of the holder, unless
                             previously redeemed, into fully paid and
                             nonassessable shares of Common Stock, at a
                             conversion price of $6.95 of liquidation preference
                             per share of Common Stock plus accrued but unpaid
                             dividends, if any (equivalent to an initial
                             conversion rate of approximately 7.1942 shares of
                             Common Stock for each share of Preferred Stock,
                             plus cash in lieu of fractional shares). The
                             Preferred Stock is subject to adjustment upon the
                             occurrence of certain events. Shares of Preferred
                             Stock called for redemption will remain convertible
                             into shares of Common Stock up to and including
                             (but not after) the close of business on the date
                             fixed for redemption. See "Description of Preferred
                             Stock -- Conversion Rights."
 
CHANGE OF CONTROL..........  Upon any Change of Control, each holder of
                             Preferred Stock shall, in the event that the Market
                             Value at such time is less than the Conversion
                             Price, have a one-time option to convert such
                             holder's shares of Preferred Stock into shares of
                             Common Stock (plus cash in lieu of fractional
                             shares) at an adjusted conversion price equal to
                             the greater of (x) the average closing price of the
                             Common Stock on the NYSE (or such other national
                             securities exchange or automated quotation system
                             on which the Common Stock is then listed for
                             trading or quotation) for the five trading day
                             period (the "Market Value") ending on the date on
                             which a Change of Control event occurs (the "Change
                             of Control Date") and (y) $2.83 (being 66 2/3% of
                             the Market Value for the period ended April 16,
                             1998). In lieu of issuing the shares of Common
                             Stock issuable upon conversion in the event of a
                             Change of Control, the Company may, at its option,
                             make a cash payment equal to the Market Value as of
                             the Change of Control Date of the shares of Common
                             Stock otherwise issuable. See "Description of
                             Preferred Stock -- Change of Control."
 
VOTING RIGHTS..............  Except as required by law and the Company's
                             Certificate of Incorporation (including the
                             Certificate of Designation for the Preferred
                             Stock), the holders of Preferred Stock will have no
                             voting rights unless dividends payable on the
                             Preferred Stock are in arrears for six quarterly
                             periods, in which case the holders of the Preferred
                             Stock voting separately as a class with the shares
                             of any other preferred stock or preference
                             securities having similar voting rights will be
                             entitled at the next regular or special meeting of
                             stockholders of the Company to elect two directors
                             of the Company (such voting rights and the terms of
                             the directors so elected to continue until such
                             time as the dividend arrearage on the Preferred
                             Stock has been paid in full). The affirmative
                             consent of holders of at least 66 2/3% of the
                             outstanding Preferred Stock will be required for
                             the issuance of any class or series of stock (or
                             security convertible into stock) of the Company
                             ranking pari passu or senior to the Preferred Stock
                             as to dividends, liquidation rights or voting
                             rights and for amend-
 
                                        5
<PAGE>   7
 
                             ments to the Company's Certificate of Incorporation
                             that would affect adversely the rights of holders
                             of the Preferred Stock. See "Description of
                             Preferred Stock -- Voting Rights."
 
TAX CONSEQUENCES...........  The Federal income tax consequences of acquiring
                             and holding the Preferred Stock and the shares of
                             Common Stock issuable upon conversion of such
                             Preferred Stock or in redemption therefor are
                             described in "Federal Income Tax Considerations."
                             Prospective investors are urged to consult their
                             own tax advisors regarding the tax consequences of
                             acquiring, holding or disposing of the Preferred
                             Stock or the shares of Common Stock issuable upon
                             conversion of such Preferred Stock or in redemption
                             therefor in light of their personal investment
                             circumstances, including consequences resulting
                             from the possibility that distributions on the
                             Preferred Stock may exceed the Company's current
                             and accumulated earnings and profits in which case
                             they would not be traded as dividends for tax
                             purposes.
 
BOOK-ENTRY; DELIVERY AND
FORM.......................  The Preferred Stock is represented by permanent
                             global certificates in definitive, fully registered
                             form deposited with a custodian for, and registered
                             in the name of, a nominee of The Depository Trust
                             Company ("DTC"). See "Description of Preferred
                             Stock -- Book-Entry; DTC."
 
                                  COMMON STOCK
 
LISTING....................  The Common Stock is listed for trading on the New
                             York Stock Exchange.
 
TRADING SYMBOL.............  "CHK"
 
OUTSTANDING BEFORE
OFFERING...................  On June 1, 1998, 105,100,325 shares of Common Stock
                             were issued and outstanding and 11,545,757 shares
                             of Common Stock were issuable upon the exercise of
                             outstanding options. See "Description of Common
                             Stock."
 
                                  RISK FACTORS
 
     An investment in the Preferred Stock or the Common Stock involves certain
risks that a potential investor should carefully evaluate prior to making such
an investment.
 
                                        6
<PAGE>   8
 
                                  RISK FACTORS
 
     In addition to the other information set forth elsewhere or incorporated by
reference in this Prospectus, the following factors relating to the Company and
this offering should be considered when evaluating an investment in the Shares.
 
ABILITY OF THE COMPANY TO PAY CASH DIVIDENDS
 
     Dividends on the Preferred Stock must be paid in cash. Under certain of the
Indentures governing the Company's outstanding senior notes (the "Indentures"),
the Company may pay cash dividends and make other distributions on or in respect
of its capital stock, including the Preferred Stock, only if certain financial
tests are met. Currently, the restrictions contained in the Indentures would
prohibit the Company from paying dividends under certain circumstances. The
Company currently anticipates that a future prolonged reduction in natural gas
prices and, to a lesser extent, oil prices could cause the Company to be unable
to incur additional indebtedness under one or more of such Indentures which, in
turn, would render the Company unable to pay dividends on the Preferred Stock.
There can be no assurance that the Company's existing or future financing
arrangements will permit the Company to pay cash dividends on the Preferred
Stock. In the event that any of the Company's financing agreements limit the
Company's ability to pay cash dividends on the Preferred Stock when required,
the Company will be unable to pay cash dividends on the Preferred Stock unless
it can refinance amounts outstanding under such agreements. There can be no
assurance that the Company would be able to refinance amounts outstanding under
such agreements. The failure of the Company to pay cash dividends on the
Preferred Stock could result in the election of two members of the Company's
Board of Directors by the holders of the Preferred Stock.
 
     Under Oklahoma law, cash dividends on capital stock may only be paid from
"surplus" or, if there is no "surplus," from the corporation's net profits for
the then current or the preceding fiscal year. Until the Company achieves
profitability, the ability of the Company to pay cash dividends on the Preferred
Stock will require the availability of adequate "surplus," which is defined as
the excess, if any, of the Company's net assets (total assets less total
liabilities) over its capital (generally the par value of its issued capital
stock). As a result, there can be no assurance that adequate surplus will be
available to pay cash dividends on the Preferred Stock or that, even if such
surplus is available, the Company will have sufficient cash to pay dividends on
the Preferred Stock. In addition under Oklahoma law, the Preferred Stock cannot
be redeemed if the redemption will cause any impairment of the capital of the
Company.
 
CONCENTRATION OF UNEVALUATED LEASEHOLD IN LOUISIANA
 
     The Company's future performance will be affected by the development
results of its existing proved undeveloped reserves and its inventory of
unproved drilling locations, particularly in the Louisiana Trend and the
Tuscaloosa Trend. As of March 31, 1998, the Company had an investment in total
unevaluated and unproved leasehold of approximately $144 million, of which
approximately $59 million was located in the Louisiana Trend and the Tuscaloosa
Trend. Approximately 40%, or $96 million, of the Company's 1998 drilling budget
is associated with drilling, construction of production facilities and seismic
activity in the Louisiana Trend and the Tuscaloosa Trend. Failure of these
drilling activities to achieve anticipated quantities of economically attractive
reserves and production would have a material adverse effect on the Company's
liquidity, operations and financial results and could result in future full-cost
ceiling writedowns.
 
IMPAIRMENT OF ASSET VALUE
 
     The Company reported full-cost ceiling writedowns of $236 million, $110
million and $250 million in the fiscal year ended June 30, 1997, the six months
ended December 31, 1997 and the three months ended March 31, 1998, respectively.
Beginning in the quarter ended September 30, 1997, the Company reduced its
drilling budget for the Louisiana Trend overall and concentrated remaining
Austin Chalk drilling activity in the Masters Creek area of Louisiana. In
addition, the Company initiated a strategy to replace and expand its oil and gas
reserves through acquisitions as a complement to its historical strategy of
adding reserves through drilling. The Company has also reduced its emphasis on
acquiring unproved leasehold acreage to be developed
 
                                        7
<PAGE>   9
 
through exploratory drilling. While these actions are intended to mitigate the
higher risks associated with a growth strategy based on significant exploratory
drilling, there can be no assurance that this change in strategy will result in
enhanced future economic results or will prevent additional leasehold impairment
and/or full-cost ceiling writedowns.
 
     Since December 31, 1997, oil prices have declined, reaching ten-year lows
during June 1998. In addition, the Company has completed acquisitions based on
expectations of higher oil and gas prices than those currently being received.
Based on estimated NYMEX prices of $14.50 per Bbl and $2.00 per Mcf as of June
30, 1998, reserve estimates as of March 31, 1998 (pro forma for the acquisitions
completed during the quarter ending June 30, 1998), and the estimated evaluation
of leasehold during the quarter ending June 30, 1998, the Company estimates it
will incur an additional full-cost ceiling writedown of between $225 million and
$250 million as of June 30, 1998. Additional impairments of certain of the
Company's other fixed assets located in the Louisiana Trend may be required at
June 30, 1998. Such impairments would result from lower than expected reserves
and production throughput in gathering, transmission and processing facilities.
Such additional impairment could range from $10 million to $20 million. If these
impairments occur, the Company will incur a substantial loss which would further
reduce shareholders' equity.
 
     The Company uses the full-cost method of accounting for its investment in
oil and gas properties. Under the full-cost method of accounting, all costs of
acquisition, exploration and development of oil and gas reserves are capitalized
into a "full-cost pool" as incurred, and properties in the pool are depleted and
charged to operations using the unit-of-production method based on the ratio of
current production to total proved oil and gas reserves. To the extent that such
capitalized costs (net of accumulated depreciation, depletion and amortization)
less deferred taxes exceed the present value of estimated future net cash flows
from proved oil and gas reserves and the lower of cost or fair value of unproved
properties after income tax effects, such excess costs are charged to
operations. If a writedown is required, it would result in a charge to earnings
but would not have an impact on cash flows from operating activities. Once
incurred, a writedown of oil and gas properties is not reversible at a later
date even if oil and gas prices increase.
 
     Following the Company's announcement in late June 1997 of disappointing
drilling results in the Louisiana Trend and a full-cost ceiling writedown, a
number of purported class action lawsuits alleging violations of Sections 10(b)
and 20(a) of the Exchange Act and Rule 10b-5 thereunder were filed against the
Company and certain of its officers and directors. See "-- Patent and Securities
Litigation."
 
ACQUISITION AND INTEGRATION OF OPERATIONS RISKS
 
     The Company's growth strategy includes the acquisition of oil and gas
properties. There can be no assurance, however, that the Company will be able to
identify attractive acquisition opportunities, obtain financing for acquisitions
on satisfactory terms or successfully acquire identified targets. Future
acquisitions may be financed through the incurrence of additional indebtedness
to the extent permitted under the Company's debt instruments, including the
Indentures, or through the issuance of capital stock. Furthermore, there can be
no assurance that competition for acquisition opportunities in the oil and gas
industry will not escalate, thereby increasing the cost to the Company of making
further acquisitions or causing the Company to refrain from making additional
acquisitions.
 
     The Company is subject to risks that properties acquired by it will not
perform as expected, that estimates of value will not prove accurate and that
the returns from such properties will not support the indebtedness incurred or
the other consideration used to acquire, or the capital expenditures needed to
develop, such properties. The addition of the properties acquired in
acquisitions may result in additional full-cost ceiling writedowns to the extent
the Company's capitalized costs of such properties exceed the estimated present
value of the related proved reserves. In addition, expansion of the Company's
operations may place a significant strain on the Company's management, financial
and other resources. The Company's ability to manage future growth will depend
upon its ability to monitor operations, maintain effective costs and other
controls and expand the Company's internal management, technical and accounting
systems, all of which will result in higher operating expenses. Any failure to
expand these areas and to implement and improve such systems, procedures and
controls in an efficient manner at a pace consistent with the growth of the
Company's
 
                                        8
<PAGE>   10
 
business could have a material adverse effect on the Company's business,
financial condition and results of operations. In addition, the integration of
acquired properties with existing operations will entail considerable expenses
in advance of anticipated revenues and may cause substantial fluctuations in the
Company's operating results. There can be no assurance that the Company will be
able to successfully integrate the properties acquired to date or any other
businesses it may acquire.
 
     The Company has also acquired proved reserves in Canada. In addition to the
risks described above, the acquisition of assets in Canada has the additional
risks associated with currency exchange and valuation, foreign regulation and
taxation, and severe climate and operating conditions.
 
NEED TO REPLACE RESERVES; SUBSTANTIAL CAPITAL REQUIREMENTS
 
     As is customary in the oil and gas exploration and production industry, the
Company's future success depends upon its ability to find, develop or acquire
additional oil and gas reserves that are economically recoverable. Unless the
Company successfully replaces the reserves that it produces through successful
development, exploration or acquisition, the Company's proved reserves will
decline. Approximately 43% of the Company's estimated proved reserves at
December 31, 1997 (18% on a pro forma basis for acquisitions completed in the
first and second quarters of 1998) were located in the Austin Chalk formation in
Texas and Louisiana, where wells are characterized by rapid decline rates.
Additionally, approximately 47% (35% on a pro forma basis) of the Company's
total estimated proved reserves at December 31, 1997 were undeveloped. Recovery
of such reserves will require significant capital expenditures and successful
drilling operations. There can be no assurance that the Company can successfully
find and produce reserves economically in the future.
 
     The Company has made and intends to make substantial capital expenditures
in connection with the development, exploration and production of its oil and
gas properties. Historically, the Company has funded its capital expenditures
through a combination of internally generated funds, equity and long-term and
short-term debt financing arrangements. Future cash flows are subject to a
number of variables, such as the level of production from existing wells, prices
of oil and gas and the Company's success in locating and producing new reserves.
If revenue were to decrease as a result of lower oil and gas prices, decreased
production or otherwise, and the Company's access to capital were limited, the
Company would have a reduced ability to replace its reserves or to maintain
production at current levels, potentially resulting in a decrease in production
and revenue over time. If the Company's cash flow from operations is not
sufficient to satisfy its capital expenditure budget, there can be no assurance
that additional debt or equity financing will be available to meet these
requirements.
 
RESTRICTIONS IMPOSED BY LENDERS
 
     The instruments governing certain indebtedness of the Company and its
Restricted Subsidiaries (as defined) may impose significant operating and
financial restrictions on the Company. The terms of certain of the Indentures
limit or prohibit, among other things, the ability of the Company to incur
additional indebtedness, pay dividends, repay indebtedness prior to its stated
maturity, sell assets or engage in mergers or acquisitions. These restrictions
could also limit the ability of the Company to effect future financings, make
needed capital expenditures, withstand a future downturn in the Company's
business or the economy in general, or otherwise conduct necessary corporate
activities. A failure by the Company to comply with these restrictions could
lead to a default under the terms of such indebtedness. In the event of default,
the holders of such indebtedness could elect to declare all of the funds
borrowed pursuant thereto to be due and payable together with accrued and unpaid
interest. In such event, there can be no assurance that the Company would be
able to make such payments or borrow sufficient funds from alternative sources
to make any such payment. Even if additional financing could be obtained, there
can be no assurance that it would be on terms that are favorable or acceptable
to the Company. In addition, the Company's indebtedness under its bank credit
facilities will be secured by liens on a portion of the assets of the Company
and its subsidiaries. The pledge of such collateral could impair the Company's
ability to obtain favorable financing in the future.
 
                                        9
<PAGE>   11
 
REPURCHASE OF SENIOR NOTES UPON A CHANGE OF CONTROL AND OTHER EVENTS
 
     The Company must offer to purchase $620 million aggregate principal amount
of its outstanding senior notes upon the occurrence of certain events. In the
event of a Change of Control (as defined), the Company must offer to purchase
such senior notes then outstanding at a purchase price equal to 101% of the
principal amount thereof, plus accrued and unpaid interest to the date of
purchase (a "Change of Control Offer"). In the event of certain asset
dispositions, the Company will be required under certain circumstances to use
the Excess Proceeds (as defined) to offer to purchase such senior notes at 100%
of the principal amount thereof, plus accrued and unpaid interest to the date of
purchase (a "Net Proceeds Offer").
 
     Prior to commencing such an offer to purchase, the Company may be required
to (i) repay in full all indebtedness of the Company that would prohibit the
repurchase of senior notes, or (ii) obtain any requisite consent to permit the
repurchase. If the Company is unable to repay all of such indebtedness or is
unable to obtain the necessary consents, then the Company will be unable to
offer to purchase senior notes, and such failure will constitute an Event of
Default under the applicable Indentures. It is unlikely that the Company would
have sufficient funds available at the time of any Change of Control or Net
Proceeds Offer to satisfy all such debt obligations (including repurchases of
senior notes and payment of its bank credit facilities) simultaneously without
refinancing the indebtedness.
 
     The events that constitute a Change of Control or require a Net Proceeds
Offer may also be events of default under any future bank credit facility or
other senior indebtedness of the Company and the Restricted Subsidiaries. Such
events may permit the lenders under such debt instruments to accelerate the debt
and, if the debt is not paid, to enforce security interests on assets of the
Company and the Restricted Subsidiaries, thereby limiting the Company's ability
to raise cash to repurchase senior notes, and reducing the practical benefit of
the offer to purchase provisions to the holders of the affected senior notes.
 
SUBSTANTIAL INDEBTEDNESS
 
     As of March 31, 1998, the Company's shareholders' equity was $221 million
($461 million on a pro forma basis) and its long-term indebtedness was $655
million ($920 million on a pro forma basis). Long-term indebtedness represented
approximately 75% (67% on a pro forma basis) of total book capitalization. If
the Company incurs additional full-cost ceiling writedowns (such as the possible
writedown of up to approximately $250 million which could be recorded as of June
30, 1998 using estimates of proved reserves as of March 31, 1998, commodity
prices as of June 30, 1998 and the estimated evaluation of leasehold during the
quarter ending June 30, 1998), shareholders' equity will be further reduced.
Standard & Poor's and Moody's Investors Service ("Moody's") have both recently
downgraded the Company's credit ratings. Moody's has announced that its outlook
for the Company's credit ratings is negative, pending Moody's ongoing evaluation
of the Company's new business strategy.
 
     The Company anticipates funding potential future acquisitions with a
combination of commercial bank debt, long-term debt and/or preferred or common
equity. If, as a result of general market conditions, additional losses, reduced
credit ratings or for any other reason, the Company is unable to issue
additional securities and/or borrow from commercial banks, the Company's
liquidity would be impaired and growth potential reduced. Sustained negative
credit conditions could result in reduced earnings or losses.
 
PATENT AND SECURITIES LITIGATION
 
     Union Pacific Resources Company ("UPRC") has sued the Company alleging
infringement of a patent for a drillbit steering method, including direct
infringement and, subsequent to August 13, 1995, inducement of infringement.
UPRC's claims against the Company are based on services provided to the Company
by a third party vendor controlled by former UPRC employees. UPRC is seeking
injunctive relief, damages of an unspecified amount, including actual and
enhanced damages, interest, costs and attorneys' fees. The Company believes that
it has meritorious defenses to UPRC's allegations and that the UPRC patent is
invalid. The Company has filed a motion to construe UPRC's patent claims, and
other dispositive motions are pending. No estimate of a probable loss or range
of estimate of a probable loss, if any, can be made at this time; however, in
 
                                       10
<PAGE>   12
 
reports filed in the proceeding, experts for UPRC claim that damages could be as
much as $18 million while Company experts state that the amount should not
exceed $25,000, in each case based on a reasonable royalty.
 
     The Company and certain of its officers and directors are defendants in a
consolidated class action suit alleging violations of the Exchange Act. The
plaintiffs assert that the defendants made material misrepresentations and
failed to disclose material facts about the success of the Company's exploration
efforts in the Louisiana Trend. As a result, the complaint alleges, the price of
the Company's Common Stock was artificially inflated from January 25, 1996 until
June 27, 1997, when the Company issued a press release announcing disappointing
drilling results in the Louisiana Trend and a full-cost ceiling writedown to be
reflected in its June 30, 1997 financial statements. The plaintiffs further
allege that certain of the named individual defendants sold Company Common Stock
during the class period when they knew or should have known adverse nonpublic
information. The plaintiffs seek a determination that the suit is a proper class
action and damages in an unspecified amount, together with interest and costs of
litigation, including attorneys' fees. No estimate of loss or range of estimate
of loss, if any, can be made at this time.
 
     A purported class action alleging violations of the Securities Act has been
filed against the Company and others on behalf of investors who purchased common
stock of Bayard Drilling Technologies, Inc. ("Bayard") in its initial public
offering in November 1997. Total proceeds of the offering were $254 million, of
which the Company received net proceeds of $90 million as a selling shareholder.
Plaintiffs allege that the Company, a major customer of Bayard's drilling
services and the owner of 30.1% of Bayard's common stock outstanding prior to
the offering, was a controlling person of Bayard. Plaintiffs assert that the
Bayard prospectus contained material omissions and misstatements relating to (i)
the Company's financial "hardships" and their significance on Bayard's business,
(ii) increased costs associated with Bayard's growth strategy and (iii)
undisclosed pending related-party transactions between Bayard and third parties
other than the Company. The alleged defective disclosures are claimed to have
resulted in a decline in Bayard's share price following the public offering. The
plaintiffs seek a determination that the suit is a proper class action and
damages in an unspecified amount or rescission, together with interest and costs
of litigation, including attorneys' fees. No estimate of loss or range of
estimate of loss, if any, can be made at this time.
 
     While no prediction can be made as to the outcome of these matters or the
amount of damages that might be awarded, if any, an adverse result in any of
them could be material to the Company.
 
FLUCTUATIONS IN OIL AND GAS PRICES
 
     The Company's revenue, profitability and future rate of growth are
substantially dependent upon prevailing prices for oil, natural gas and natural
gas liquids, which are dependent upon numerous factors such as weather,
economic, political and regulatory developments and competition from other
sources of energy. The volatile nature of the energy markets makes it
particularly difficult to estimate future prices of oil, natural gas and natural
gas liquids. Prices of oil, natural gas and natural gas liquids are subject to
wide fluctuations in response to relatively minor changes in circumstances, and
there can be no assurance that future prolonged decreases in such prices will
not occur. All of these factors are beyond the control of the Company. Any
further significant decline in oil and gas prices could have a material adverse
effect on the Company's operations, financial condition and level of
expenditures for the development of its oil and gas reserves, and may result in
additional writedowns of the Company's investments due to ceiling test
limitations.
 
     In accordance with customary industry practice, the Company relies on
independent third party service providers to provide most of the services
necessary to drill new wells, including drilling rigs and related equipment and
services, horizontal drilling equipment and services, trucking services,
tubulars, fracing and completion services and production equipment. The industry
has experienced significant price increases for these services during the last
year and this trend is expected to continue into the future. These cost
increases could in the future significantly increase the Company's development
costs and decrease the return possible from drilling and development activities,
and possibly render the development of certain proved undeveloped reserves
uneconomical.
 
                                       11
<PAGE>   13
 
HEDGING RISKS
 
     From time to time, the Company enters into hedging arrangements relating to
a portion of its oil and gas production. These hedges have in the past involved
fixed arrangements and other arrangements at a variety of fixed prices and with
a variety of other provisions including price floors and ceilings. The Company
may in the future enter into oil and gas futures contracts, options, collars and
swaps. The Company's hedging activities, while intended to reduce the Company's
sensitivity to changes in market prices of oil and gas, are subject to a number
of risks including instances in which (i) production is less than expected, (ii)
there is a widening of price differentials between delivery points required by
fixed price delivery contracts to the extent they differ from those on the
Company's production or (iii) the Company's counterparties to its futures
contract will be unable to meet the financial terms of the transaction. While
the use of hedging arrangements limits the risk of declines in oil and gas
prices, it may limit the benefit to the Company of increases in the price of oil
and gas. Beginning in May 1998, the Company also utilizes interest rate hedging
arrangements to limit its exposure to fixed interest rates in a low and/or
declining interest rate environment when floating rates may be lower than fixed
rates. The risks of such hedging are that interest rates increase above those
that would have been incurred under existing fixed rate obligations.
 
UNCERTAINTY OF ESTIMATES OF OIL AND GAS RESERVES
 
     There are numerous uncertainties inherent in estimating quantities of
proved oil and gas reserves, including many factors beyond the control of the
Company. These estimates rely upon various assumptions, including assumptions
required by the Commission as to constant oil and gas prices, drilling and
operating expenses, capital expenditures, taxes and availability of funds. The
process of estimating oil and gas reserves is complex, requiring significant
decisions and assumptions in the evaluation of available geological,
geophysical, engineering and economic data for each reservoir. In addition,
reserve engineering is a subjective process of estimating underground
accumulations of oil and gas that cannot be measured in any exact way, and the
accuracy of any reserve estimate is a function of the quality of available data
and of engineering and geological interpretations and judgment. As a result,
estimates by different engineers often vary, and are subject to great
uncertainty. This is particularly true as to proved undeveloped reserves, which
are inherently less certain than proved developed reserves and which comprise a
significant portion of the Company's proved reserves. In addition, the estimated
future net revenue from proved reserves and the present value thereof are based
on certain assumptions, including prices, future production levels and costs,
that may not prove correct. Actual future production, revenue, taxes,
development expenditures, operating expenses and quantities of recoverable oil
and gas reserves may vary substantially from those estimated by the Company. Any
significant variance in these assumptions could materially affect the estimated
quantity and value of reserves disclosed by the Company from time to time and
may justify revisions of earlier estimates, and such revisions may be material.
In addition, the Company's reserves may be subject to downward or upward
revision, based upon production history, results of future exploration and
development, prevailing oil and gas prices and other factors, many of which are
beyond the Company's control. In fiscal 1997, the six months ended December 31,
1997 and the three months ended March 31, 1998, revisions to the Company's
proved reserves, the estimated future net revenues therefrom and the present
value thereof contributed to $236 million, $110 million and $250 million
impairments, respectively, of the Company's oil and gas properties. Based on
estimated NYMEX prices of $14.50 per Bbl and $2.00 per Mcf as of June 30, 1998,
the Company's estimated proved reserves as of March 31, 1998, pro forma for
acquisitions completed during the quarter ending June 30, 1998, and the
estimated evaluation of leasehold during the quarter ending June 30, 1998, the
Company estimates it will record a full-cost ceiling writedown of between $225
million and $250 million as of June 30, 1998. Additional impairments of certain
of the Company's other fixed assets located in the Louisiana Trend may be
required at June 30, 1998. Such impairments would result from lower than
expected reserves and production throughput in gathering, transmission and
processing facilities. Such additional impairment could range from $10 million
to $20 million.
 
                                       12
<PAGE>   14
 
DRILLING AND OPERATING RISKS
 
     Oil and gas drilling activities are subject to numerous risks, many of
which are beyond the Company's control. The Company's operations may be
curtailed, delayed or canceled as a result of title problems, weather
conditions, compliance with governmental requirements, mechanical difficulties
and shortages or delays in the delivery of equipment. In addition, the Company's
properties may be susceptible to hydrocarbon drainage from production by other
operators on adjacent properties. Industry operating risks include the risk of
fire, explosions, blow-outs, pipe failure, abnormally pressured formations and
environmental hazards such as oil spills, gas leaks, ruptures or discharges of
toxic gases, the occurrence of any of which could result in substantial losses
to the Company due to injury or loss of life, severe damage to or destruction of
property, natural resources and equipment, pollution or other environmental
damage, clean-up responsibilities, regulatory investigation and penalties and
suspension of operations.
 
     The Company has been among the most active drillers of horizontal wells and
may drill a significant number of deep horizontal wells in the future. The
Company's horizontal drilling activities involve greater risk of mechanical
problems than conventional vertical drilling operations.
 
     In accordance with customary industry practice, the Company maintains
insurance against some, but not all, of the risks described above. There can be
no assurance that any insurance will be adequate to cover losses or liabilities.
The Company cannot predict the continued availability of insurance, or its
availability at premium levels that justify its purchase.
 
GOVERNMENTAL REGULATION
 
     Oil and gas operations are subject to various federal, state and local
governmental regulations which may be changed from time to time in response to
economic or political conditions. From time to time, regulatory agencies have
imposed price controls and limitations on production in order to conserve
supplies of oil and gas. In addition, the production, handling, storage,
transportation and disposal of oil and gas, by-products thereof and other
substances and materials produced or used in connection with oil and gas
operations are subject to regulation under federal, state and local laws and
regulations primarily relating to protection of human health and the
environment. To date, expenditures related to complying with these laws and for
remediation of existing environmental contamination have not been significant in
relation to the results of operations of the Company. There can be no assurance
that the trend of more expansive and stricter environmental legislation and
regulations will not continue.
 
ENVIRONMENTAL RISKS
 
     The Company is subject to a variety of federal, state and local
governmental laws and regulations related to the storage, use, discharge and
disposal of toxic, volatile or otherwise hazardous materials. These regulations
subject the Company to increased operating costs and potential liability
associated with the use and disposal of hazardous materials. Although these laws
and regulations have not had a material adverse effect on the Company's
financial condition or results of operations, there can be no assurance that the
Company will not be required to make material expenditures in the future.
Moreover, the Company anticipates that such laws and regulations will become
increasingly stringent in the future, which could lead to material costs for
environmental compliance and remediation by the Company.
 
     Any failure by the Company to obtain required permits for, control the use
of, or adequately restrict the discharge of hazardous substances under present
or future regulations could subject the Company to substantial liability or
could cause its operations to be suspended. Such liability or suspension of
operations could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
COMPETITION
 
     The Company operates in a highly competitive environment. The Company
competes with major and independent oil and gas companies for the acquisition of
desirable oil and gas properties, as well as for the
 
                                       13
<PAGE>   15
 
equipment and labor required to develop and operate such properties. Many of
these competitors have financial and other resources substantially greater than
those of the Company.
 
RELIANCE ON KEY PERSONNEL; CONFLICTS OF INTEREST
 
     The Company is dependent upon its Chief Executive Officer, Aubrey K.
McClendon, and its Chief Operating Officer, Tom L. Ward. The unexpected loss of
the services of either of these executive officers could have a detrimental
effect on the Company. The Company maintains $20 million key man life insurance
policies on the life of each of Messrs. McClendon and Ward.
 
     Messrs. McClendon and Ward, together with another executive officer of the
Company, have rights to participate in wells drilled by the Company. Messrs.
McClendon and Ward have elected to participate during all periods since the
Company's initial public offering in 1993 with individual interests of between
1.0% and 1.5%. Such participation may result in substantial amounts owing to the
Company, which indebtedness is without interest unless not paid in a timely
manner. Additionally, on June 17, 1998, the Company agreed to make a secured
loan to each of Messrs. McClendon and Ward for $5 million. Each loan will be
payable on December 31, 2001 with interest accruing at an annual rate of 9%
(which is the Company's approximate cost of funds), payable quarterly. Such
transactions may create interests which conflict with those of the Company.
 
CONTROL BY CERTAIN STOCKHOLDERS
 
     At June 1, 1998, Aubrey K. McClendon, Tom L. Ward, the Aubrey K. McClendon
Children's Trust and the Tom L. Ward Children's Trust beneficially owned an
aggregate of 24,710,827 shares (including outstanding vested options)
representing 24% of the Company's outstanding Common Stock, and members of the
Company's Board of Directors and executive officers, including Messrs. McClendon
and Ward and their respective children's trusts, beneficially owned an aggregate
of 28,222,203 shares (including outstanding vested options), which represented
27% of the Company's outstanding Common Stock. As a result, Messrs. McClendon
and Ward, together with executive officers and directors of the Company, are in
a position to significantly influence matters requiring the vote or consent of
the Company's stockholders.
 
ABSENCE OF A PUBLIC MARKET FOR THE PREFERRED STOCK
 
     The Preferred Stock is a new issue for which there is currently limited
trading. Preferred Stock resold pursuant to this Prospectus will no longer be
eligible for trading in the PORTAL Market, although the Company intends to apply
for listing of the Preferred Stock on the NYSE. The Company has been advised by
the Initial Purchasers that they currently intend to make a market in the
Preferred Stock; however, they are not obligated to do so and any such
market-making activities may be discontinued at any time without notice.
Accordingly, there can be no assurance as to the development or liquidity of any
market for the Preferred Stock. If a market for such securities were to develop,
such securities could trade at prices that may be higher or lower than their
initial offering price depending upon many factors, including prevailing
interest rates, the Company's operating results and the markets for similar
securities, and such market may cease to continue at any time.
 
                                       14
<PAGE>   16
 
                                USE OF PROCEEDS
 
     The Selling Shareholders, not the Company, will receive all proceeds from
the sale of the Shares.
 
                      RATIO OF EARNINGS TO COMBINED FIXED
                     CHARGES AND PREFERRED STOCK DIVIDENDS
 
     Following is the ratio of earnings to combined fixed charges and preferred
stock dividends for the periods presented:
 
<TABLE>
<CAPTION>
                               SIX MONTHS
     THREE MONTHS                ENDED
   ENDED MARCH 31,            DECEMBER 31,                   YEARS ENDED JUNE 30,
   ----------------          --------------          ------------------------------------
   1998       1997           1997      1996          1997    1996    1995    1994    1993
   -----      -----          ----      ----          ----    ----    ----    ----    ----
   <S>        <C>            <C>       <C>           <C>     <C>     <C>     <C>     <C>
     --       4.4x             --      3.2x            --    2.4x    2.9x    2.3x      --
</TABLE>
 
     For purposes of computing the ratio of earnings to combined fixed charges
and preferred stock dividends, earnings are defined as income (loss) of the
Company and its subsidiaries from continuing operations before income taxes,
extraordinary items and fixed charges. Fixed charges consist of interest
(whether expensed or capitalized) and amortization of debt expense and discount
or premiums relating to any indebtedness. Earnings were insufficient to cover
fixed charges by $258.8 million for the three months ended March 31, 1998, $36.7
million for the six months ended December 31, 1997, $193.3 million in fiscal
1997 and $656,000 in fiscal 1993. Pro forma for the Company's sale of the
Preferred Stock on April 22, 1998 and the contemporaneous sale of $500 million
aggregate principal amount of its 9 5/8% Senior Notes due 2005 and the
application of the proceeds therefrom, earnings were insufficient to cover
combined fixed charges and preferred stock dividends by $597.7 million for the
twelve months ended March 31, 1998.
 
                              SELLING SHAREHOLDERS
 
     The following table sets forth the name of each of the Selling
Shareholders, the number of shares of Preferred Stock beneficially owned by each
Selling Shareholder prior to the offering and offered hereby, the percentage of
the outstanding Preferred Stock beneficially owned by each Selling Shareholder
prior to the offering, the number of shares of Common Stock beneficially owned
by each Selling Stockholder prior to the offering and the percentage of the
outstanding Common Stock beneficially owned by each Selling Shareholder prior to
the offering. Only the shares of Common Stock issuable upon conversion of the
Preferred Stock are offered hereby. Except as otherwise indicated in the notes,
no Selling Shareholder will own any shares of Preferred Stock or Common Stock
once the shares offered hereby are sold. As of the date of this Prospectus, no
shares of Common Stock had been issued as the result of any conversion or
exchange of any Preferred Stock.
 
<TABLE>
<CAPTION>
                                                PREFERRED STOCK                     COMMON STOCK
                                         ------------------------------    ------------------------------
                                         NUMBER OF    PERCENT OF SHARES    NUMBER OF    PERCENT OF SHARES
      NAME OF SELLING SHAREHOLDER        SHARES(1)     OUTSTANDING(2)      SHARES(3)     OUTSTANDING(4)
      ---------------------------        ---------    -----------------    ---------    -----------------
<S>                                      <C>          <C>                  <C>          <C>
Abbott Laboratories Annuity Retirement
  Plan.................................       680              *               4,892        *
Alliance Capital Management............    20,000              *             143,884        *
American Investors Life Insurance
  Company, Inc.........................    30,000              *             215,827        *
American Skandia Trust -- AST Putnam
  Balanced Portfolio...................       105              *                 755        *
Ameritech Corporation Pension Plan.....     1,560              *              11,223        *
ARBCO Associates, L.P..................    10,000              *              71,942        *
Argent Classic Convertible Arbitrage
  Fund (Bermuda), L.P..................    17,500              *             125,899        *
Argent Classic Convertible Arbitrage
  Fund L.P.............................    17,500              *             125,899        *
</TABLE>
 
                                       15
<PAGE>   17
 
<TABLE>
<CAPTION>
                                                PREFERRED STOCK                     COMMON STOCK
                                         ------------------------------    ------------------------------
                                         NUMBER OF    PERCENT OF SHARES    NUMBER OF    PERCENT OF SHARES
      NAME OF SELLING SHAREHOLDER        SHARES(1)     OUTSTANDING(2)      SHARES(3)     OUTSTANDING(4)
      ---------------------------        ---------    -----------------    ---------    -----------------
<S>                                      <C>          <C>                  <C>          <C>
Arkansas Public Employees Retirement
  System...............................    14,000              *             100,719        *
Associated Electric & Gas Insurance
  Services Limited.....................    10,000              *              71,942        *
Atlas Strategic Income Fund............     1,000              *               7,194        *
Baltimore Gas & Electric Company.......     5,000              *              35,971        *
Blue Cross Blue Shield Michigan
  Foundation...........................     2,000              *              14,388        *
Christian Science Trustees for Gifts
  and Endowments.......................     2,850              *              20,503        *
Chrysler Corporation Master Retirement
  Trust................................    48,300           1.05%            347,482        *
Chrysler Corporation Master Retirement
  Trust Seth Sub Account...............    10,000              *              71,942        *
City of Richmond, Virginia.............     2,000              *              14,388        *
Combined Insurance.....................    12,400              *              89,208        *
Dana Farber Cancer Institute...........       140              *               1,007        *
Dean Witter Convertible Securities
  Trust................................   100,000           2.17%            719,424        *
Declaration of Trust for the Defined
  Benefit Plans of ZENECA Holdings
  Inc..................................     7,500              *              53,956        *
Declaration of Trust for the Defined
  Benefit Plans of ICI American
  Holdings Inc.........................    11,700              *              84,172        *
Delaware State Employees' Retirement
  Fund.................................    42,500              *             305,755        *
Delta Air Lines Master Trust...........    20,400              *             146,762        *
Detroit Edison Company.................    10,000              *              71,942        *
Detroit Medical Center.................    10,800              *              77,697        *
Donaldson, Lufkin & Jenrette Securities
  Corporation(5).......................   170,100           3.70%          1,223,741      1.15%
Employees Retirement Plan of Agway,
  Inc..................................       465              *               3,345        *
Employers Reinsurance Corp.............    27,500              *             197,841        *
Equitable Life Assurance...............    70,000              *             503,597        *
Fetzer Institute.......................     1,000              *               7,194        *
Fidelity Advisor Series II:
  Fidelity Advisor High Yield
     Fund(6)...........................    45,000              *             323,741        *
Fidelity Capital Trust: Fidelity Value
  Fund(6)..............................    99,000           2.15%            712,230        *
Fidelity Financial Trust: Fidelity
  Convertible Securities Fund(6).......    46,000           1.00%            330,935        *
Fidelity Fixed-Income Trust: Spartan
  High Income Fund(6)..................    36,600              *             263,309        *
Fidelity Management Trust Company on
  behalf of accounts managed by
  it(7)................................    15,400              *             110,791        *
Fidelity Summer Street Trust: Fidelity
  Capital & Income Fund................    27,000              *             194,244        *
First Church of Christ, Scientist --
  Endowment............................     3,400              *              24,460        *
General Motors Corporation.............    25,000              *             179,856        *
</TABLE>
 
                                       16
<PAGE>   18
 
<TABLE>
<CAPTION>
                                                PREFERRED STOCK                     COMMON STOCK
                                         ------------------------------    ------------------------------
                                         NUMBER OF    PERCENT OF SHARES    NUMBER OF    PERCENT OF SHARES
      NAME OF SELLING SHAREHOLDER        SHARES(1)     OUTSTANDING(2)      SHARES(3)     OUTSTANDING(4)
      ---------------------------        ---------    -----------------    ---------    -----------------
<S>                                      <C>          <C>                  <C>          <C>
General Motors Employees Domestic Group
  Trust................................   154,075           3.35%          1,108,453      1.04%
General Motors Investment Management
  Corp.................................   160,000           3.48%          1,151,079      1.08%
Glacier Water Services, Inc............    10,000              *              71,942        *
Gruber & McBaine International.........     1,000              *               7,194        *
Halliburton Company....................    10,000              *              71,942        *
High Yield Portfolio...................    33,300              *             239,568        *
Hillside Capital Incorporated Corporate
  Account..............................     4,000              *              28,776        *
Houston Municipal Employees Retirement
  Fund.................................    10,000              *              71,942        *
Hudson River High Yield................    70,000           1.52%            503,597        *
IBM Retirement Fund....................    10,000              *              71,942        *
IDS Life Income Advantage Fund.........    10,000              *              71,942        *
Kayne, Anderson Non-Traditional
  Investments, L.P.....................    15,000              *             107,913        *
Kayne, Anderson Offshore Limited.......     5,000              *              35,971        *
Lafayette College......................     8,000              *              57,553        *
Lagunitas Partners, LP.................     4,000              *              28,776        *
L.B. Series Fund, Inc., High Yield
  Portfolio............................    69,000           1.50%            496,402        *
Lincoln National Global Asset
  Allocation fund, Inc.................       235              *               1,690        *
Loomis Sayles Bond Fund................    35,000(8)           *             251,798        *
Loomis Sayles Fixed Income Fund........     2,500              *              17,985        *
Loomis Sayles High Yield Fund..........     2,500              *              17,985        *
Lutheran Brotherhood High Yield Fund...    46,000           1.00%            330,935        *
Maine State Retirement System..........    10,000(8)           *              71,942        *
Mainstay Convertible Fund..............    55,000           1.20%            395,683        *
Mainstay Strategic Value...............     5,000              *              35,971        *
Massachusetts Mutual Life Insurance
  Company(9)...........................    48,955           1.06%            352,194        *
MassMutual High Yield Partners, LLC....    19,590              *             140,935        *
MassMutual Corporate Value Partners
  Limited..............................    19,600              *             141,007        *
MassMutual Corporate Investors.........     6,855              *              49,316        *
Maxim Corporate Bond Fund..............     2,500              *              17,985        *
Metropolitan Insurance Company/LS High
  Yield Series.........................     6,000              *              43,165        *
Merrill Lynch World Income Fund,
  Inc..................................     5,000              *              35,971        *
Merrill Lynch Multinational Investment
  Portfolion Equity/Convertible Series
  Portfolio (Offshore Fund)............     3,000              *              21,582        *
Merrill Lynch Convertible Fund, Inc....    12,000              *              86,330        *
Metropolitan Life Insurance Company....    10,000              *              71,942        *
Metropolitan Life Insurance Company
  Separate Account 235.................     3,500              *              25,179        *
Metropolitan Life Insurance Company
  Separate Account 242.................     1,000              *               7,194        *
</TABLE>
 
                                       17
<PAGE>   19
 
<TABLE>
<CAPTION>
                                                PREFERRED STOCK                     COMMON STOCK
                                         ------------------------------    ------------------------------
                                         NUMBER OF    PERCENT OF SHARES    NUMBER OF    PERCENT OF SHARES
      NAME OF SELLING SHAREHOLDER        SHARES(1)     OUTSTANDING(2)      SHARES(3)     OUTSTANDING(4)
      ---------------------------        ---------    -----------------    ---------    -----------------
<S>                                      <C>          <C>                  <C>          <C>
Minneapolis Teachers Retirement Fund...     5,000              *              35,971        *
Mobil Oil Corporation..................       680              *               4,892        *
Motors Insurance Corp..................    20,000              *             143,884        *
NationsBanc Montgomery Securities
  LLC..................................    20,000              *             143,884        *
New England Strategic Income Fund......    25,000              *             179,856        *
New York City Board of Education.......     1,500              *              10,791        *
New York City Employees Retirement
  Plan.................................     7,500(8)           *              53,956        *
New York City Firemen's Retirement
  Plan.................................     1,250(8)           *               8,992        *
New York City Police Retirement Plan...     1,250(8)           *               8,992        *
New York Life Separate Account #7......    35,000              *             251,798        *
New York State Electric & Gas Company..    15,000(8)           *             107,913        *
OCM....................................    69,200           1.50%            497,841        *
Offense Group Associates, L.P..........    20,000              *             143,885        *
Oppenheimer Champion Income Fund.......    32,000              *             230,215        *
Oppenheimer High Income Fund...........    14,000              *             100,719        *
Oppenheimer High Yield Fund............    56,000           1.22%            402,877        *
Oppenheimer Strategic Bond Fund........     2,000              *              14,388        *
Oppenheimer Strategic Income Fund......    85,000           1.85%            611,510        *
Orange County Employees Retirement
  System...............................     7,500(8)           *              53,956        *
Paloma Securities, LLC.................    27,500              *             197,841        *
Partners Healthcare System.............     4,000(8)           *              28,776        *
Prudential High Yield Fund.............   110,000           2.39%            791,366        *
Prudential Series Fund, Inc., High
  Yield Portfolio......................    20,000              *             143,884        *
Prudential Variable Contract Account --
  Investment Fund......................   146,100           3.18%          1,051,079      1.00%
Prudential Variable Contract
  Account -- 2.........................    86,700           1.88%            623,741        *
Prudential Variable Contract
  Account -- 10........................    67,200           1.46%            483,453        *
Putnam Asset Allocation
  Funds -- Balanced Portfolio..........     1,810              *              13,021        *
Putnam Asset Allocation Funds --
  Conservative Portfolio...............       600              *               4,316        *
Putnam Asset Allocation Funds -- Growth
  Portfolio............................       770              *               5,539        *
Putnam Balanced Retirement Fund........       235              *              32,690(10)     *
Putnam Convertible Opportunities and
  Income Trust.........................       560              *               4,028        *
Putnam Diversified Income Trust........    25,210              *             181,366        *
Putnam Funds Trust -- Putnam High Yield
  Total Return Fund....................       550              *               3,956        *
Putnam Funds Trust -- Putnam High Yield
  Trust II.............................     4,195              *              30,179        *
Putnam High Income Convertible and Bond
  Fund.................................  590.....              *               4,244        *
</TABLE>
 
                                       18
<PAGE>   20
 
<TABLE>
<CAPTION>
                                                PREFERRED STOCK                     COMMON STOCK
                                         ------------------------------    ------------------------------
                                         NUMBER OF    PERCENT OF SHARES    NUMBER OF    PERCENT OF SHARES
      NAME OF SELLING SHAREHOLDER        SHARES(1)     OUTSTANDING(2)      SHARES(3)     OUTSTANDING(4)
      ---------------------------        ---------    -----------------    ---------    -----------------
<S>                                      <C>          <C>                  <C>          <C>
Putnam High Yield Advantage Fund.......    53,640           1.17%            385,899        *
Putnam High Yield Fixed Income Fund,
  LLC..................................       935              *               6,726        *
Putnam High Yield Managed Trust........     4,195              *              30,179        *
Putnam High Yield Trust................    48,340           1.05%            347,769        *
Putnam Income Fund.....................     2,695              *              19,388        *
Putnam Managed High Yield Trust........     1,195              *               8,597        *
Putnam Master Income Trust.............     2,290              *              16,474        *
Putnam Premier Income Trust............     5,750              *              41,366        *
Putnam Strategic -- Income Fund........       870              *               6,258        *
Putnam Variable Trust -- PVT
  Diversified Income Fund..............     2,910              *              20,935        *
Putnam Variable Trust -- PVT Global
  Asset Allocation Fund................       515              *               3,705        *
Putnam Variable Trust -- PVT High Yield
  Fund.................................    11,670              *              83,956        *
Raytheon...............................     2,500(8)           *              17,985        *
Raytheon Company Master Pension
  Trust................................    24,600              *             176,978        *
Salomon Brothers Total Return Fund.....    12,500              *              89,928        *
Security Insurance Company of
  Hartford.............................    20,000              *             143,884        *
Starvest Discretionary Portfolio.......    10,000              *              71,942        *
State Employees Retirement Fund of the
  State of Delaware....................    17,000              *             122,302        *
State of Connecticut...................    60,100           1.31%            432,374        *
State of Oregon Equity.................    90,000           1.96%            647,482        *
Strategic Global Fund -- High Yield
  Fixed Income (Putnam) Fund...........       750              *               5,395        *
Summer Hill Global Partners L.P........       975              *               7,014        *
The George Putnam Fund of Boston.......     1,675              *             236,050(11)     *
Thermo Electron Balanced Investment
  Fund.................................    13,000              *              93,525        *
Toronto Dominion (New York), Inc.......    98,700           2.15%            710,071        *
Tower Foundation.......................     1,500              *              10,791        *
Travelers Series Fund, Inc. -- Putnam
  Diversified Income Portfolio.........       635              *               4,568        *
Turnberry Capital Management, L.P......    50,000           1.09%          2,645,512(12)   2.46%
United Association of Plumbers and Pipe
  Fitters..............................     4,700              *              33,812        *
Vanguard...............................    48,000           1.04%            345,323        *
Van Kampen American Capital Convertible
  Securities Fund(13)..................    12,300              *              88,489        *
Van Kampen American Capital Harbor
  Fund(13).............................    76,800           1.67%            552,517        *
Variable Insurance Products Fund:
  High Income Portfolio................    63,700           1.38%            458,273        *
World Bank.............................     2,500              *              17,985        *
</TABLE>
 
- ---------------
  *  Less than 1%
 (1) Unless otherwise noted, the information set forth is as of June 1, 1998.
 (2) Based upon 4,600,000 shares of Preferred Stock outstanding as of June 1,
     1998.
 
                                       19
<PAGE>   21
 
 (3) Assumes conversion of the full amount of Preferred Stock held by each
     holder at the initial rate of $6.95 of liquidation preference per share
     (equivalent to a conversion rate of approximately 7.1942 shares of Common
     Stock per share of Preferred Stock). Under the terms of the Certificate of
     Designation for the Preferred Stock, fractional shares will not be issued
     upon conversion of the Preferred Stock; cash will be paid in lieu of
     fractional shares, if any.
 
 (4) Based on 105,100,325 shares of Common Stock outstanding as of June 1, 1998,
     treating as outstanding the number of shares shown as being issuable upon
     the assumed conversion by the named holder of the full amount of such
     holder's Preferred Stock, but not assuming the conversion of the Preferred
     Stock of any other holder.
 
 (5) Donaldson, Lufkin & Jenrette Securities Corporation was an Initial
     Purchaser in the Preferred Stock Offering.
 
 (6) The Selling Shareholder is advised by Fidelity Management & Research
     Company ("FMR Co."), which is a wholly-owned subsidiary of FMR Corp.
     ("FMR"). Information is as of June 4, 1998.
 
 (7) Shares are owned directly by various private investment accounts, primarily
     employee benefit plans, for which Fidelity Management Trust Company
     ("FMTC") serves as trustee or managing agent. FMTC is a wholly-owned
     subsidiary of FMR. Information is as of June 4, 1998.
 
 (8) As of June 16, 1998.
 
 (9) The Trustees of the Chesapeake Energy Corporation Savings and Incentive
     Stock Bonus Plan (the "Plan") and Massachusetts Mutual Life Insurance
     Company ("MassMutual") have entered into an immediate participation group
     annuity contract with guaranties pursuant to which MassMutual holds
     $3,145,898 of the Plan's assets in investment accounts.
 
(10) Includes 31,000 shares of Common Stock owned by Putnam Balanced Retirement
     Fund.
 
(11) Includes 224,000 shares of Common Stock owned by The George Putnam Fund of
     Boston.
 
(12) Includes 2,285,800 shares of Common Stock owned by Turnberry Capital
     Management, L.P.
 
(13) Van Kampen American Capital Asset Management, Inc., as investment advisor
     of Van Kampen American Capital Convertible Securities Fund and Van Kampen
     American Capital Harbor Fund, has discretionary authority to make
     investment decisions with respect to each such Selling Shareholder's
     portfolio. An affiliate of such Selling Shareholders, Morgan Stanley & Co.
     Incorporated, was an Initial Purchaser in the Preferred Stock Offering.
 
     None of the Selling Shareholders listed above has, or within the past three
years has had, any position, office or other material relationship with the
Company or any of its predecessors or affiliates, except as set forth in the
notes above.
 
     Because the Selling Shareholders may offer all or some portion of the above
shares pursuant to this Prospectus or otherwise, no estimate can be given as to
the amount or percentage of such securities that will be held by the Selling
Shareholders upon termination of any such sale. In addition, the Selling
Shareholders identified above may have sold, transferred or otherwise disposed
of all or a portion of such securities since the date indicated in transactions
exempt from the registration requirements of the Securities Act of 1933. The
Selling Shareholders may sell all, part or none of the securities listed above.
 
     On April 22, 1998, the Company and the Initial Purchasers entered into an
agreement (the "Registration Rights Agreement") pursuant to which the Shares
offered hereby have been registered for resale.
 
     The Company may require the holders of Preferred Stock covered by the
Registration Statement to temporarily suspend use of the Registration Statement
to sell the Shares (i) for up to 60 days in any twelve-month period if the
Company determines in good faith, as evidenced by a resolution of its Board of
Directors, that (a) sales under the Registration Statement would require the
disclosure of material information which the Company has a bona fide business
purpose for preserving as confidential, or (b) such disclosure would impede the
Company's ability to consummate a material transaction; (ii) upon the issuance
by the Commission of any stop order suspending the effectiveness of the
Registration Statement under the Securities Act or of the suspension by any
state securities commission of the qualification of the Shares for
 
                                       20
<PAGE>   22
 
offering or sale in any jurisdiction, or the initiation of any proceeding for
any of the preceding purposes; or (iii) upon the discovery of any fact or the
happening of any event that makes any statement of a material fact made in the
Registration Statement, this Prospectus, any amendment or supplement thereto or
any document incorporated by reference therein untrue, or that requires the
making of any additions to or changes in the Registration Statement or the
Prospectus in order to make the statements therein, in light of the
circumstances under which they were made, not misleading.
 
     If the Registration Statement ceases to be effective or useable in
connection with resales of the Shares without being succeeded (a) within five
business days by a post-effective amendment to the Registration Statement that
cures such failure and that is itself declared effective within ten days of
filing such post-effective amendment to the Registration Statement or (b) within
20 days by the filing of an Exchange Act report incorporated by reference in the
Registration Statement that cures such failure (each such event, a "Registration
Default"), then the Company will be required to pay to each holder of Transfer
Restricted Securities (as defined), accruing the date of the first such
Registration Default, liquidated damages in an amount equal to one-half of one
percent (0.5%) per annum of the liquidation preference amount of the Transfer
Restricted Securities held by such holder during the first 90-day period
immediately following the occurrence of the first such Registration Default,
increasing by an additional one-half of one percent (0.5%) per annum of the
liquidation preference amount of such Transfer Restricted Securities during each
subsequent 90-day period, up to a maximum amount of liquidated damages equal to
two percent (2.0%) per annum of the liquidation preference of such Transfer
Restricted Securities, which provision for liquidated damages will continue
until such Registration Default has been cured. The Company will not be required
to pay Liquidated Damages for more than one Registration Default at any given
time. Liquidated damages accrued as of any dividend payment date will be payable
on such date.
 
     This summary of certain provisions of the Registration Rights Agreement
does not purport to be complete and is subject to, and is qualified in its
entirety by reference to, all the provisions of such Registration Rights
Agreement.
 
                         DESCRIPTION OF PREFERRED STOCK
 
     The following summary of the terms of Preferred Stock does not purport to
be complete and is subject to, and qualified in its entirety by reference to,
the provisions of the Certificate of Designation for the 7% Cumulative
Convertible Preferred Stock of the Company (the "Certificate of Designation"), a
copy of which has been filed in the Office of the Secretary of State of Oklahoma
and as an exhibit to the Registration Statement.
 
GENERAL
 
     Under the Company's Certificate of Incorporation, as amended (the
"Certificate of Incorporation"), the Company's Board of Directors is authorized,
without further stockholder action, to issue up to 10,000,000 shares of
preferred stock, par value $.01 per share, in one or more series, with such
voting powers or without voting powers, and with such designations, preferences
and relative, participating, optional or other special rights, and
qualifications, limitations or restrictions, as shall be set forth in the
resolutions providing therefor. As of the date of this Prospectus, the Company
has 4,600,000 shares of preferred stock issued and outstanding, which are the
shares of Preferred Stock offered hereby.
 
     The Preferred Stock is, and any Common Stock issued upon the conversion or
exchange of Preferred Stock will be, fully paid and nonassessable. The transfer
agent, registrar, redemption, conversion and dividend disbursing agent for
shares of both the Preferred and Common Stock is UMB Bank, N.A.
 
RANKING
 
     The Preferred Stock, with respect to dividend distributions and
distributions upon the liquidation, winding-up and dissolution of the Company,
ranks (i) senior to all classes of common stock of the Company and to each other
class of capital stock or series of preferred stock established after April 22,
1998, the issue
 
                                       21
<PAGE>   23
 
date of the Preferred Stock (the "Issue Date"), by the Board of Directors, the
terms of which do not expressly provide that it ranks senior to or on a parity
with the Preferred Stock as to dividend distributions and distributions upon the
liquidation, winding-up and dissolution of the Company; (ii) subject to certain
conditions, on a parity with any class of capital stock or series of preferred
stock issued by the Company established after the Issue Date by the Board of
Directors, the terms of which expressly provide that such class or series will
rank on a parity with the Preferred Stock as to dividend distributions and
distributions upon the liquidation, winding-up and dissolution of the Company;
and (iii) subject to certain conditions, junior to each class of capital stock
or series of preferred stock issued by the Company established after the Issue
Date by the Board of Directors, the terms of which expressly provide that such
class or series will rank senior to the Preferred Stock as to dividend
distributions and distributions upon liquidation, winding-up and dissolution of
the Company.
 
DIVIDENDS
 
     Holders of the Preferred Stock will be entitled to receive cumulative
annual cash dividends of $3.50 per share, payable quarterly in arrears out of
assets legally available therefor, on February 1, May 1, August 1 and November 1
of each year commencing August 1, 1998, when, as and if declared by the Board of
Directors. Dividends will accumulate and be cumulative (whether or not declared)
from the Issue Date. Dividends will be payable to holders of record as they
appear on the Company's stock register on such record dates, not more than 60
days nor less than 10 days preceding the payment dates thereof, as shall be
fixed by the Company's Board of Directors. Dividends payable on the Preferred
Stock for each full dividend period will be computed by dividing the annual
dividend rate by four. Dividends payable on the Preferred Stock for any period
less than a full dividend period (based upon the number of days elapsed during
the period) will be computed on the basis of a 360-day year consisting of twelve
30-day months.
 
     No dividends or other distributions (other than a dividend or distribution
payable solely in stock of the Company ranking junior to the Preferred Stock as
to dividends and upon liquidation and cash in lieu of fractional shares) may be
declared, made or paid or set apart for payment upon the Common Stock or upon
any other stock of the Company ranking junior to or pari passu with the
Preferred Stock as to dividends, nor may any Common Stock or any other stock of
the Company ranking junior to or pari passu with the Preferred Stock as to
dividends or upon liquidation be redeemed, purchased or otherwise acquired for
any consideration (or any money paid to or made available for a sinking fund for
the redemption of any shares of any such stock) by the Company (except by
conversion into or exchange for stock of the Company ranking junior to the
Preferred Stock as to dividends and upon liquidation) unless full cumulative
dividends have been or contemporaneously are paid or declared and a sum
sufficient for the payment thereof is set apart for such payment on the
Preferred Stock for all dividend payment periods terminating on or prior to the
date of such declaration, payment, redemption, purchase or acquisition.
Notwithstanding the foregoing, if full dividends have not been paid on the
Preferred Stock and any other preferred stock ranking pari passu with the
Preferred Stock as to dividends, dividends may be declared and paid on the
Preferred Stock and such other preferred stock so long as the dividends are
declared and paid pro rata so that the amounts of dividends declared per share
on the Preferred Stock and such other preferred stock will in all cases bear to
each other the same ratio that accrued and unpaid dividends per share on the
shares of the Preferred Stock and such other preferred stock bear to each other;
provided, that if such dividends are paid in cash on the other preferred stock,
dividends will also be paid in cash on the Preferred Stock. Holders of shares of
the Preferred Stock will not be entitled to any dividend, whether payable in
cash, property or stock, in excess of full cumulative dividends. No interest, or
sum of money in lieu of interest, will be payable in respect of any dividend
payment or payments which may be in arrears.
 
     The holders of shares of Preferred Stock at the close of business on a
dividend payment record date will be entitled to receive the dividend payment on
those shares (except that holders of shares called for redemption on a
redemption date between the record date and the dividend payment date will be
entitled to receive such dividend on such redemption date) on the corresponding
dividend payment record date notwithstanding the subsequent conversion thereof
or the Company's default in payment of the dividend due on that dividend payment
date. However, shares of Preferred Stock surrendered for conversion during the
 
                                       22
<PAGE>   24
 
period between the close of business on any dividend payment record date and the
close of business on the day immediately preceding the applicable dividend
payment record date (except for shares called for redemption on a redemption
date during that period) must be accompanied by payment of an amount equal to
the dividend payable on the shares on that dividend payment record date. A
holder of shares of Preferred Stock on a dividend payment record date who (or
whose transferee) tenders any shares for conversion on a dividend payment record
date will receive the dividend payable by the Company on the Preferred Stock on
that date, and the converting holder need not include payment in the amount of
such dividend upon surrender of shares of Preferred Stock of conversion. Except
as provided above, the Company shall make no payment or allowance for unpaid
dividends, whether or not in arrears, on converted shares or for dividends on
the shares of Common Stock issued upon conversion.
 
     The Company's ability to declare and pay cash dividends and make other
distributions with respect to its capital stock, including the Preferred Stock,
is limited by provisions contained in various financing agreements which
restrict dividend payments to the Company by its subsidiaries. Similarly, the
Company's ability to declare and pay dividends may be limited by applicable
Oklahoma law. See "Risk Factors -- Ability of the Company to Pay Cash
Dividends."
 
LIQUIDATION PREFERENCE
 
     In the event of any voluntary or involuntary dissolution, liquidation or
winding up of the Company, the holders of the Preferred Stock will be entitled
to receive and to be paid out of the Company's assets available for distribution
to its stockholders, before any payment or distribution is made to holders of
Common Stock or any other class or series of stock of the Company ranking junior
to the Preferred Stock upon liquidation, a liquidation preference in the amount
of $50 per share of the Preferred Stock, plus accrued and unpaid dividends
thereon. If upon any voluntary or involuntary dissolution, liquidation or
winding up of the Company, the amounts payable with respect to the liquidation
preference of the Preferred Stock and any other shares of stock of the Company
ranking as to any such distribution pari passu with the Preferred Stock are not
paid in full, the holders of the Preferred Stock and of such other shares will
share pro rata in proportion to the full distributable amounts to which they are
entitled. After payment of the full amount of the liquidating distribution to
which they are entitled, the holders of the Preferred Stock will have no right
or claim to any of the remaining assets of the Company. Neither the sale of all
or substantially all of the property or business of the Company (other than in
connection with the winding up of its business), nor the merger or consolidation
of the Company into or with any other corporation, will be deemed to be
dissolution, liquidation or winding up, voluntary or involuntary, of the
Company.
 
OPTIONAL REDEMPTION
 
     The Preferred Stock is not subject to any sinking fund or other similar
provisions. The Preferred Stock may not be redeemed prior to May 1, 2001. On or
after May 1, 2001, the Preferred Stock may be redeemed, in whole or in part, at
the option of the Company, in cash, by delivery of fully paid and nonassessable
shares of Common Stock or a combination thereof, upon not less than 30 days'
notice nor more than 60 days' notice, during the twelve-month periods commencing
on May 1 of the years indicated below, at the following
 
                                       23
<PAGE>   25
 
redemption prices per share, plus in each case all accrued and unpaid dividends
due thereon to the redemption date:
 
<TABLE>
<CAPTION>
                                                            REDEMPTION
                                                            PRICE PER
                           YEAR                               SHARE
                           ----                             ----------
<S>                                                         <C>
2001......................................................    $52.45
2002......................................................     52.10
2003......................................................     51.75
2004......................................................     51.40
2005......................................................     51.05
2006......................................................     50.70
2007......................................................     50.35
2008 and thereafter.......................................     50.00
</TABLE>
 
     In the event that fewer than all the outstanding shares of the Preferred
Stock are to be redeemed, the shares to be redeemed will be determined pro rata.
 
     From and after the applicable redemption date (unless the Company shall be
in default of payment of the redemption price), dividends on the shares of the
Preferred Stock to be redeemed on such redemption date shall cease to accrue,
said shares shall no longer be deemed to be outstanding, and all rights of the
holders thereof as stockholders of the Company (except the right to receive the
redemption price) will cease.
 
     If any dividends on the Preferred Stock are in arrears, no shares of the
Preferred Stock will be redeemed unless all outstanding shares of the Preferred
Stock are simultaneously redeemed.
 
VOTING RIGHTS
 
     Except as required by law, the holders of the Preferred Stock will have no
voting rights except as set forth below or as otherwise required by law from
time to time.
 
     If the dividends payable on the Preferred Stock are in arrears for six
quarterly periods, the holders of the Preferred Stock voting separately as a
class with the shares of any other preferred stock or preference securities
having similar voting rights will be entitled at the next regular or special
meeting of stockholders of the Company to elect two directors of the Company
(such voting rights and the terms of the directors so elected to continue until
such time as the dividend arrearage on the Preferred Stock has been paid in
full). The affirmative vote or consent of the holders of at least 66 2/3% of the
outstanding Preferred Stock will be required for the issuance of any class or
series of stock (or security convertible into stock) of the Company ranking pari
passu or senior to the Preferred Stock as to dividends, liquidation rights or
voting rights and for amendments to the Company's Certificate of Incorporation
that would affect adversely the rights of holders of the Preferred Stock,
including, without limitation, any increase in the authorized number of shares
of preferred stock. In all such cases, each share of Preferred Stock shall be
entitled to one vote.
 
CONVERSION RIGHTS
 
     The Preferred Stock will be convertible at any time at the option of the
holder thereof into such number of whole shares of Common Stock as is equal to
the aggregate liquidation preference, plus accrued and unpaid dividends thereon
to the date the shares of Preferred Stock are surrendered for conversion,
divided by an initial conversion price of $6.95, subject to adjustment as
described below (such price or adjusted price being referred to as the
"Conversion Price"). A share of Preferred Stock called for redemption will be
convertible into shares of Common Stock up to and including but not after,
unless the Company defaults in the payment of the amount payable upon
redemption, the close of business on the date fixed for redemption.
 
     No fractional shares of Common Stock or securities representing fractional
shares of Common Stock will be issued upon conversion. Any fractional interest
in a share of Common Stock resulting from conversion will be paid in cash based
on the last reported sale price of the Common Stock on the NYSE (or such other
national securities exchange or authorized quotation system on which the Common
Stock is then listed or
 
                                       24
<PAGE>   26
 
authorized for quotation or, if not so listed or authorized for quotation, an
amount determined in good faith by the Board of Directors to be the fair value
of the Common Stock) at the close of business on the trading day next preceding
the date of conversion.
 
     The Conversion Price is subject to adjustment (in accordance with formulas
set forth in the Certificate of Designation) in certain events, including (i)
any redemption payment or payment of a dividend (or other distribution) payable
in shares of Common Stock on any class of capital stock of the Company (other
than the issuance of shares of Common Stock in connection with the payment in
redemption for, or of dividends on or the conversion of Preferred Stock), (ii)
any issuance to all holders of shares of Common Stock of rights, options or
warrants entitling them to subscribe for or purchase shares of Common Stock or
securities convertible into or exchangeable for shares of Common Stock at less
than the Market Value for the period ending on the date of issuance; provided,
however, that no adjustment shall be made with respect to such a distribution if
the holder of shares of Preferred Stock would be entitled to receive such
rights, options or warrants upon conversion at any time of shares of Preferred
Stock into Common Stock and provided further, that if such options or warrants
are only exercisable upon the occurrence of certain triggering events, then the
Conversion Price will not be adjusted until such triggering events occur, (iii)
any subdivision, combination or reclassification of the Common Stock, (iv) any
dividend or distribution to all holders of shares of Common Stock (other than a
dividend or distribution referred to above) made pursuant to any shareholder
rights plan, "poison pill" or similar arrangement and excluding regular
dividends and distributions paid exclusively in cash and dividends payable upon
the Preferred Stock, (v) any distribution consisting exclusively of cash
(excluding any cash portion of distributions referred to in (iv) above, or cash
distributed upon a merger or consolidation to which the second succeeding
paragraph applies) to all holders of shares of Common Stock in an aggregate
amount that, combined together with (a) all other such all-cash distributions
made within the then-preceding 12-months in respect of which no adjustment has
been made and (b) any cash and the fair market value of other consideration paid
or payable in respect of any tender offer by the Company or any of its
subsidiaries for shares of Common Stock concluded within the then-preceding
12-months in respect of which no adjustment has been made, exceeds 15% of the
Company's market capitalization (defined as the product of the then-current
market price of the Common Stock times the number of shares of Common Stock then
outstanding) on the record date of such distribution, (vi) the completion of a
tender or exchange offer made by the Company or any of its subsidiaries for
shares of Common Stock that involves an aggregate consideration that, together
with (a) any cash and other consideration payable in a tender or exchange offer
by the Company or any of its subsidiaries for shares of Common Stock expiring
within the then-preceding 12-months in respect of which no adjustment has been
made and (b) the aggregate amount of any such all-cash distributions referred to
in (v) above to all holders of shares of Common Stock within the then-preceding
12-months in respect of which no adjustments have been made, exceeds 15% of the
Company's market capitalization on the expiration of such tender offer or (vii)
a distribution to all holders of Common Stock consisting of evidences of
indebtedness, shares of capital stock other than Common Stock or assets
(including securities, but excluding those dividends, rights, options, warrants
and distributions referred to above). No adjustment of the Conversion Price will
be required to be made until the cumulative adjustments (whether or not made)
amount to 1.0% or more of the Conversion Price as last adjusted. The Company
reserves the right to make such reductions in the Conversion Price in addition
to those required in the foregoing provisions as it considers to be advisable in
order that any event treated for Federal income tax purposes as a dividend of
stock or stock rights will not be taxable to the recipients. In the event the
Company elects to make such a reduction in the Conversion Price, the Company
will comply with the requirements of securities laws and regulations thereunder
if and to the extent that such laws and regulations are applicable in connection
with the reduction of the Conversion Price.
 
     In the event that the Company distributes rights or warrants (other than
those referred to in (ii) in the preceding paragraph) pro rata to holders of
shares of Common Stock, so long as any such rights or warrants have not expired
or been redeemed by the Company, the holder of any Preferred Stock surrendered
for conversion will be entitled to receive upon such conversion, in addition to
the shares of Common Stock then issuable upon such conversion (the "Conversion
Shares"), a number of rights or warrants to be determined as follows: (i) if
such conversion occurs on or prior to the date for the distribution to the
holders of rights or warrants of separate certificates evidencing such rights or
warrants (the "Distribution Date"), the same
 
                                       25
<PAGE>   27
 
number of rights or warrants to which a holder of a number or shares of Common
Stock equal to the number of Conversion Shares is entitled at the time of such
conversion in accordance with the terms and provisions applicable to the rights
or warrants and (ii) if such conversion occurs after such Distribution Date, the
same number of rights or warrants to which a holder of the number of shares of
Common Stock into which such Preferred Stock was convertible immediately prior
to such Distribution Date would have been entitled on such Distribution Date in
accordance with the terms and provisions applicable to the rights or warrants.
The Conversion Price will not be subject to adjustment on account of any
declaration, distribution or exercise of such rights or warrants.
 
     In case of any reclassification, consolidation or merger of the Company
with or into another person or any merger of another person with or into the
Company (with certain exceptions), or in case of any sale, transfer or
conveyance of all or substantially all of the assets of the Company (computed on
a consolidated basis), each share of Preferred Stock then outstanding will,
without the consent of any holder of Preferred Stock, become convertible only
into the kind and amount of securities, cash and other property receivable upon
such reclassification, consolidation, merger, sale, transfer or conveyance by a
holder of the number of shares of Common Stock into which such Preferred Stock
was convertible immediately prior thereto, after giving effect to any adjustment
event.
 
     In the case of any distribution by the Company to its stockholders of
substantially all of its assets, each holder of Preferred Stock will participate
pro rata in such distribution based on the number of shares of Common Stock into
which such holder's shares of Preferred Stock would have been convertible
immediately prior to such distribution.
 
CHANGE OF CONTROL
 
     Notwithstanding the foregoing, upon a Change of Control (as defined below),
holders of Preferred Stock shall, in the event that the Market Value at such
time is less than the Conversion Price, have a one time option to convert all of
their outstanding shares of Preferred Stock into shares of Common Stock at an
adjusted Conversion Price equal to the greater of (i) the Market Value as of the
Change of Control Date and (ii) $2.83, which is 66 2/3% of the Market Value for
the period ended April 16, 1998. Such option shall be exercisable during a
period of not less than 30 days nor more than 60 days commencing on the third
business day after notice of the Change of Control is given by the Company in
the manner specified. In lieu of issuing the shares of Common Stock issuable
upon conversion in the event of a Change of Control, the Company may, at its
option, make a cash payment equal to the Market Value determined for the period
ending on the Change of Control Date of such Common Stock otherwise issuable.
 
     The Company's Certificate of Designation defines "Change of Control" as any
of the following events: (i) the sale, lease or transfer, in one or a series of
related transactions, of all or substantially all of the Company's assets to any
Person or group (as such term is used in Section 13(d)(3) of the Exchange Act),
other than to Permitted Holders; (ii) the adoption of a plan relating to the
liquidation or dissolution of the Company; (iii) the acquisition, directly or
indirectly, by any Person or group (as such term is used in Section 13(d)(3) of
the Exchange Act as in effect on the original date of issuance of the Preferred
Stock), other than Permitted Holders, of beneficial ownership (as defined in
Rule 13d-3 under the Exchange Act as in effect on the original date of issuance
of the Preferred Stock, except that such Person shall be deemed to have
beneficial ownership of all shares that any such Person has the right to
acquire, whether such right is exercisable immediately or only after passage of
time) of more than 50% of the aggregate voting power of the Voting Stock of the
Company; provided, however, that the Permitted Holders beneficially own (as
defined in Rules 13d-3 and 13d-5 under the Exchange Act as in effect on the
original date of issuance of the Preferred Stock), directly or indirectly, in
the aggregate a lesser percentage of the total voting power of the Voting Stock
of the Company than such other Person and do not have the right or ability by
voting power, contract or otherwise to elect or designate for election a
majority of the Board of Directors of the Company (for the purposes of this
definition, such other Person shall be deemed to beneficially own any Voting
Stock of a specified corporation held by a parent corporation, if such other
Person is the beneficial owner (as defined above), directly or indirectly, of
more than 35% of the voting power of the Voting Stock of such parent corporation
and the Permitted Holders beneficially own (as defined in this proviso),
directly or indirectly, in
 
                                       26
<PAGE>   28
 
the aggregate a lesser percentage of the voting power of the Voting Stock of
such parent corporation and do not have the right or ability by voting power,
contract or otherwise to elect or designate for election a majority of the Board
of Directors of such parent corporation); or (iv) during any period of two
consecutive years, individuals who at the beginning of such period constituted
the Board of Directors of the Company (together with any new directors whose
election by such Board of Directors or whose nomination for election by the
shareholders of the Company was approved by a vote of 66 2/3% of the directors
of the Company then still in office who were either directors at the beginning
of such period or whose election or nomination for election was previously so
approved) cease for any reason to constitute a majority of the Board of
Directors of the Company then in office. For purposes of the definition of
"Change of Control," the term "Permitted Holders" means Aubrey K. McClendon and
Tom L. Ward and their respective Affiliates.
 
     The phrase "all or substantially all" of the assets of the Company is
likely to be interpreted by reference to applicable state law at the relevant
time, and will be dependent on the facts and circumstances existing at such
time. As a result, there may be a degree of uncertainty in ascertaining whether
a sale or transfer is of "all or substantially all" of the assets of the
Company.
 
BOOK ENTRY; DTC
 
     DTC acts as securities depositary for the shares of Preferred Stock offered
hereby. The Preferred Stock is registered in the name of Cede & Co. (as nominee
for DTC) and is represented by one or more fully-registered global certificates
deposited with DTC (collectively, the "Global Certificate").
 
     The laws of some jurisdictions require that certain purchasers of
securities take physical delivery of securities in definitive form. Such laws
may impair the ability to transfer beneficial interests in the shares of
Preferred Stock represented by a Global Certificate.
 
     DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law, a
member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Exchange Act. DTC
holds securities that its participants ("Participants") deposit with DTC. DTC
also facilitates the settlement among Participants of securities transactions,
such as transfers and pledges, in deposited securities through electronic
computerized book-entry changes in Participants' accounts, thereby eliminating
the need for physical movement of securities certificates. Direct Participants
include securities brokers and dealers, banks, trust companies, clearing
corporations and certain other organizations ("Direct Participants"). DTC is
owned by a number of its Direct Participants and by the NYSE, the American Stock
Exchange and the National Association of Securities Dealers, Inc. Access to the
DTC system is also available to others such as securities brokers and dealers,
banks and trust companies that clear through or maintain a custodial
relationship with a Direct Participant, either directly or indirectly ("Indirect
Participants").
 
     Purchases of shares of Preferred Stock within the DTC system must be made
by or through Direct Participants, which will receive a credit for the Preferred
Stock on DTC's records. The ownership interest of each actual purchaser of a
share of Preferred Stock ("Beneficial Owner") is in turn recorded on the Direct
or Indirect Participant's records. Beneficial Owners will receive written
confirmations providing details of the transactions, as well as periodic
statements of their holdings, from the Direct or Indirect Participants through
which the Beneficial Owners purchased the Preferred Stock. Transfers of
ownership interests in the Preferred Stock are accomplished by entries made on
the books of Participants acting on behalf of Beneficial Owners. Beneficial
Owners will not receive certificates representing their ownership interests in
the Preferred Stock, except upon a resignation of DTC or upon a decision by the
Company to discontinue the book-entry system for the Preferred Stock.
 
     To facilitate subsequent transfers, all the Preferred Stock deposited by
Participants with DTC is registered in the name of DTC's nominee, Cede & Co. The
deposit of shares of Preferred Stock with DTC and their registration in the name
of Cede & Co. effects no change in beneficial ownership. DTC has no knowledge of
the actual Beneficial Owners of the Preferred Stock; DTC's records reflect only
the identity of the Direct Participants to whose accounts such shares of
Preferred Stock are credited, which may or may not be the
 
                                       27
<PAGE>   29
 
Beneficial Owners. The Participants are responsible for keeping account of their
holdings on behalf of their customers.
 
     Conveyance of notices and other communications by DTC to Direct
Participants, by Direct Participants to Indirect Participants and by Direct
Participants and Indirect Participants to Beneficial Owners are governed by
arrangements among them, subject to any statutory or regulatory requirements as
may be in effect from time to time.
 
     Redemption notices with respect to the shares of Preferred Stock shall be
sent to Cede & Co. If less than all of the shares of Preferred Stock are being
redeemed, DTC's practice is to determine by lot the amount of the interest of
each Direct Participant in such securities to be redeemed.
 
     Although voting with respect to the Preferred Stock is limited, in those
cases where a vote is required, neither DTC nor Cede & Co. will itself consent
or vote with respect to the Preferred Stock. Under its usual procedures, DTC
would mail an "Omnibus Proxy" (i.e., a proxy conferring on Direct Participants
the right to vote as their interests appear) to the Direct Participants as soon
as possible after the record date. The Omnibus Proxy assigns Cede & Co.'s
consenting or voting rights to those Direct Participants to whose accounts the
Preferred Stock are credited on the record date (identified in a listing
attached to the Omnibus Proxy). The Company believes that the arrangements among
DTC, Direct and Indirect Participants and Beneficial Owners will enable the
Beneficial Owners to exercise rights equivalent in substance to the rights that
can be directly exercised by a Direct Participant.
 
     Cash distribution payments on the shares of Preferred Stock are made to
DTC. DTC's practice is to credit Direct Participants' accounts on the relevant
payment date in accordance with their respective holdings shown on DTC's records
unless DTC has reason to believe that it will not receive payments on such
payment date. Payments by Participants to Beneficial Owners are governed by
standing instructions and customary practices, as is the case with securities
held for the account of customers in bearer form or registered in "street name,"
and are the responsibility of such Participant and not of DTC or the Company,
subject to any statutory or regulatory requirements as may be in effect from
time to time. Payment of distributions to DTC is the responsibility of the
Company, disbursement of such payments to Direct Participants is the
responsibility of DTC and disbursement of such payments to the Beneficial Owners
is the responsibility of Direct and Indirect Participants.
 
     Except as provided herein, a Beneficial Owner in a Global Certificate will
not be entitled to receive physical delivery of shares of Preferred Stock.
Accordingly, each Beneficial Owner must rely on the procedures of DTC to
exercise any rights under the Preferred Stock, including elections as to form of
payment.
 
     DTC may discontinue providing its services as securities depositary with
respect to the Preferred Stock at any time by giving reasonable notice to the
Company. Under such circumstances, in the event that a successor securities
depositary is not obtained, certificates representing the shares of Preferred
Stock will be printed and delivered. If the Company decides to discontinue use
of the system of book-entry transfers through DTC (or a successor depositary),
certificates representing the shares of Preferred Stock will be printed and
delivered.
 
     The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that the Company believes to be reliable, but the
Company takes no responsibility for the accuracy thereof.
 
                                       28
<PAGE>   30
 
                          DESCRIPTION OF COMMON STOCK
 
     The summary of the terms of the Common Stock of the Company set forth below
does not purport to be complete and is qualified by reference to the Company's
Certificate of Incorporation and its Bylaws. Copies of the Company's Certificate
of Incorporation and Bylaws are available from the Company upon request.
 
     The holders of Common Stock are entitled to one vote for each share held of
record on all matters submitted to a vote of shareholders. Subject to
preferences that may be applicable to any outstanding preferred stock (including
the Preferred Stock), holders of Common Stock are entitled to receive ratably
such dividends as may be declared by the Board out of funds legally available
therefor. In the event of a liquidation or dissolution of the Company, holders
of Common Stock are entitled to share ratably in all assets remaining after
payment of liabilities and the liquidation preference of any outstanding
preferred stock (including the Preferred Stock).
 
     Holders of Common Stock have no preemptive rights and have no rights to
convert their Common Stock into any other securities. All of the outstanding
shares of Common Stock are, and the shares of Common Stock to be issued upon the
conversion or redemption of the Preferred Stock, will be duly authorized,
validly issued, fully paid and nonassessable. For a further description of the
Common Stock, see the description thereof contained in the Company's
registration statement on Form 8-B incorporated in this Prospectus by reference.
See "Incorporation of Certain Documents by Reference."
 
     UMB Bank, N.A. is the transfer agent and registrar for the Common Stock and
the Preferred Stock.
 
                                       29
<PAGE>   31
 
                       FEDERAL INCOME TAX CONSIDERATIONS
 
     The following discussion of certain of the Federal income tax consequences
of the purchase, ownership, and disposition of the Shares is based upon the
provisions of the Internal Revenue Code of 1986, as amended (the "Code"), the
final, temporary and proposed Treasury Regulations promulgated thereunder, and
administrative rulings and judicial decisions now in effect, all of which are
subject to change (possibly with retroactive effect) or different
interpretations. This summary does not purport to deal with all aspects of
Federal income taxation that may be relevant to an investor's decision to
purchase Shares, nor any tax consequences arising under the laws of any state,
locality or foreign jurisdiction. This summary is not intended to be applicable
to all categories of investors, such as dealers in securities, banks, insurance
companies, tax-exempt organizations, foreign persons, persons that hold the
Shares as part of a straddle or conversion transaction, or holders subject to
the alternative minimum tax, which may be subject to special rules. In addition,
this discussion is limited to persons who hold the Shares as "capital assets"
(generally, property held for investment) within the meaning of Section 1221 of
the Code. ALL PROSPECTIVE PURCHASERS OF SHARES ARE ADVISED TO CONSULT THEIR OWN
TAX ADVISERS REGARDING THE FEDERAL, STATE, LOCAL, AND FOREIGN TAX CONSEQUENCES
OF THE PURCHASE, OWNERSHIP, CONVERSION, AND DISPOSITION OF SHARES.
 
CONSEQUENCES TO HOLDERS OF SHARES
 
     Dividend Distributions. The amount of any distribution with respect to the
Shares will be treated as a dividend, taxable as ordinary income to the
recipient thereof, to the extent of the Company's current or accumulated
earnings and profits ("earnings and profits") as determined under Federal income
tax principles. To the extent the amount of such distribution exceeds the
current and accumulated earnings and profits of the Company, the excess will be
applied against and will reduce the holder's tax basis in the Shares. Any amount
by which such distribution exceeds the sum of the amount treated as a dividend
and the amount applied to reduce a holder's tax basis will be treated as
short-term or long-term capital gain, as the case may be, depending upon the
holder's holding period for the Shares.
 
     Dividends to Corporate Shareholders. In general, a distribution which is
treated as a dividend for Federal income tax purposes and is made to a corporate
shareholder with respect to the Shares will qualify for the 70%
dividends-received deduction under Section 243 of the Code. Holders should note,
however, there can be no assurance that the amount of distributions made with
respect to the Shares will not exceed the amount of current or accumulated
earnings and profits of the Company in the future. Accordingly, there can be no
assurance that the dividends-received deduction will be available in respect of
distributions on the Shares.
 
     In addition, there are many exceptions, restrictions and adjustments
relating to the availability of such dividends-received deduction, including,
without limitation, (i) restrictions relating to the holding period of stock,
the dividends on which are sought to be deducted, (ii) restrictions on the
ability to claim a deduction for dividends received or debt-financed portfolio
stock, (iii) adjustments to basis with respect to dividends treated as
"extraordinary dividends" for purposes of Section 1059 of the Code, and (iv)
special limiting rules applicable to taxpayers which pay alternative minimum
tax. Corporate shareholders should consult their own tax advisors regarding the
extent, if any, to which such exceptions and restrictions (as amended by the
Taxpayer Relief Act of 1997) may apply to their particular factual situation.
 
     Sale or Redemption. Upon a sale or other disposition (other than an
exchange of Preferred Stock for Common Stock pursuant to the conversion
privilege) of the Shares, a holder will generally recognize capital gain or loss
equal to the difference between the amount of cash and the fair market value of
property received by the holder in such sale or other disposition and such
holder's adjusted tax basis in such Shares. Such gain or loss will be long-term
gain or loss if the holder's holding period for such Shares is more than 12
months. In the case of individuals, long-term capital gains with respect to
property held for more than 18 months are taxed at a maximum 20% Federal tax
rate, and long-term capital gains with respect to property held more than 12
months but not more than 18 months are taxed at a maximum 28% Federal tax rate.
Net capital gain of corporations is taxed the same as ordinary income, with a
maximum Federal tax rate of 35%.
 
                                       30
<PAGE>   32
 
     Any gain or loss recognized by a holder upon redemption of the Preferred
Stock will be treated as gain or loss from the sale or exchange of Preferred
Stock, if, taking into account stock that is actually or constructively owned as
determined under Section 318 of the Code, (i) such holder's interest in the
Common Stock and Preferred Stock is completely terminated as a result of the
redemption, (ii) such holder's percentage ownership in the Company's voting
stock immediately after the redemption is less than 50% of the total combined
voting power of all classes of stock entitled to vote and less than 80% of such
percentage ownership immediately before such redemption, or (iii) the redemption
is "not essentially equivalent to a dividend" (within the meaning of Section 302
of the Code).
 
     If a redemption of the Preferred Stock is treated as a distribution that is
taxable as a dividend, the holder will be taxed on the payment received in the
same manner as described above under "-- Dividend Distributions," and the
holder's adjusted tax basis in the redeemed Preferred Stock will be transferred
to any remaining shares held by such holder in the Company. If the holder does
not retain any stock ownership in the Company following the redemption, then
such holder may lose such basis completely.
 
     Conversion or Exchange of Preferred Stock. A holder of Preferred Stock will
generally not recognize gain or loss by reason of receiving Common Stock in
exchange for Preferred Stock upon conversion of the Preferred Stock, except gain
or loss will be recognized with respect to any cash received in lieu of
fractional shares and the fair market value of any shares of Common Stock
attributable to dividend arrearages will be treated as a constructive
distribution as described above under "-- Dividend Distributions." The adjusted
tax basis of the Common Stock so acquired will be equal to the tax basis of the
shares of Preferred Stock exchanged therefor and the holding period of the
Common Stock received upon conversion will include the holding period of the
shares of Preferred Stock exchanged. The tax basis of any Common Stock treated
as a constructive distribution taxable as a dividend will be equal to its fair
market value on the date of the exchange.
 
     Adjustment of Conversion Price. If at any time the Company makes a
distribution of property to holders of Common Stock which would be taxable to
such stockholders as a dividend for Federal income tax purposes and, in
accordance with the antidilution provisions of the Preferred Stock, the
Conversion Price of the Preferred Stock is decreased, the amount of such
decrease may be deemed to be the payment of a taxable dividend to holders of
Preferred Stock. For example, a decrease in the Conversion Price in the event of
distributions of indebtedness or assets of the Company will generally result in
deemed dividend treatment to holders of the Preferred Stock, while generally, a
decrease in the event of stock dividends or the distribution of rights to
subscribe for the Common Stock will not result in such deemed dividend
treatment.
 
     Redemption and Conversion Premiums. Under Section 305 of the Code and the
applicable Treasury regulations thereunder, if the redemption price of Preferred
Stock exceeds its issue price, the difference ("redemption premium") may be
taxable as a constructive distribution of additional Preferred Stock to the
holder thereof (treated as a dividend to the extent of the Company's current and
accumulated earnings and profits and otherwise subject to the treatment
described above for distributions) over a certain period. Because the Preferred
Stock provides for an optional right of redemption by the Company at prices in
excess of the issue price, a holder could be required to recognize such
redemption premium under a constant interest rate method similar to that for
accruing original issue discount, if based on all of the facts and
circumstances, the optional redemption is more likely than not to occur. If
stock may be redeemed at more than one time, the time and price at which such
redemption is most likely to occur must be determined based on all of the facts
and circumstances. Applicable Treasury regulations provide a "safe harbor" under
which a right to redeem will not be treated as more likely than not to occur if
(i) the issuer and the holder are not related within the meaning of the Treasury
regulations, (ii) there are no plans, arrangements or agreements that
effectively require or are intended to compel the issuer to redeem the stock
(disregarding, for this purpose, a separate mandatory redemption), and (iii)
exercise of the right to redeem would not reduce the yield of the stock, as
determined under the Treasury regulations. Further, the Treasury regulations
provide that such redemption premium is not taxable as a constructive
distribution if it is solely in the nature of a penalty for premature
redemption. A redemption premium is solely in the nature of a penalty for
premature redemption if it is paid as a result of changes in economic or market
conditions over which neither the issuer nor the holder have control. Regardless
of whether the redemption premium is solely in the nature of a penalty for
premature
 
                                       31
<PAGE>   33
 
redemption, constructive distribution treatment will not result if the
redemption premium does not exceed a de minimis amount. Based on the Treasury
regulations, the Company intends to take the position that the existence of the
Company's optional redemption right does not result in a constructive
distribution to a holder.
 
     Further, upon a Change of Control as described above under "Description of
Preferred Stock," if a holder elects to convert Preferred Stock into shares of
Common Stock, the holder might be required to recognize a conversion premium.
Such recognition would depend, in part, on the amount of such premium and the
period of time which elapses between the issuance of the Preferred Stock and the
Change of Control event. In addition, no such recognition will be required if
either (a) the likelihood of conversion is "remote" at the time the Preferred
Stock is issued or (b) the conversion premium does not exceed a de minimis
amount of one-fourth of 1% of the value of the Common Stock into which the
Preferred Stock may be converted at the time the Change of Control occurs
multiplied by the number of complete years from the date of issuance of the
Preferred Stock to the occurrence of the Change of Control. The Company intends
to take the position that the existence of a holder's optional conversion right
does not result in a constructive distribution to the holder.
 
     Backup Withholding. Under the backup withholding provisions of the Code and
applicable Treasury Regulations, a holder of Shares may be subject to backup
withholding at the rate of 31% with respect to dividends paid on, or the
proceeds of a sale, exchange or redemption of, Shares unless such holder (a) is
a corporation or comes within certain other exempt categories and when required
demonstrates this fact or (b) provides a taxpayer identification number,
certifies as to no loss of exemption from backup withholding, and otherwise
complies with applicable requirements of the backup withholding rules. The
amount of any backup withholding from a payment to a holder will be allowed as a
credit against the holder's Federal income tax liability and may entitle such
holder to a refund, provided that the required information is furnished to the
Internal Revenue Service.
 
CONSEQUENCES TO THE COMPANY
 
     Under Section 382 of the Code, if the percentage of stock (by value) of a
corporation (the "Loss Corporation") that is owned by one or more "five-percent
shareholders" has increased by more than 50 percentage points over the lowest
percentage of stock owned by the same shareholders during a three-year testing
period (an "Ownership Change"), the use of pre-Ownership Change net operating
losses of the Loss Corporation following such Ownership Change will be limited
based on the value of the Loss Corporation on the date the Ownership Change
occurs (a "Section 382 Limitation"). As of the end of its most recent taxable
year, the Company and its subsidiaries had net operating losses which were
subject to Section 382 Limitations. Although the Company believes the issuance
of the Preferred Stock did not result in an Ownership Change, future equity
issuances or transactions among shareholders may trigger an Ownership Change. If
such an Ownership Change occurs, the Company's use of its net operating losses
will be subject to a Section 382 Limitation based on the value of the Company on
the date of such an Ownership Change.
 
     THE FOREGOING SUMMARY DOES NOT DISCUSS ALL ASPECTS OF U.S. FEDERAL INCOME
TAXATION THAT MAY BE RELEVANT TO A PARTICULAR HOLDER OF SHARES IN LIGHT OF ITS
PARTICULAR CIRCUMSTANCES AND INCOME TAX SITUATION. HOLDERS SHOULD CONSULT THEIR
OWN TAX ADVISOR AS TO THE SPECIFIC TAX CONSEQUENCES THAT WOULD RESULT FROM THEIR
PURCHASE, OWNERSHIP AND DISPOSITION OF THE SHARES, INCLUDING THE APPLICATION AND
EFFECT OF STATE, LOCAL, FOREIGN AND OTHER TAX LAWS AND THE POSSIBLE EFFECTS OF
CHANGES IN FEDERAL OR OTHER TAX LAWS.
 
                                       32
<PAGE>   34
 
                              PLAN OF DISTRIBUTION
 
     The sale or distribution of the Shares may be effected directly to
purchasers by the Selling Shareholders (including their respective donees,
pledgees, transferees or other successors in interest) as principals or through
one or more underwriters, brokers, dealers or agents from time to time in one or
more transactions (which may involve crosses or block transactions) (i) on any
national securities exchange or quotation service on which the Shares may be
listed or quoted at the time of sale or in the over-the-counter market, (ii) in
transactions otherwise than on such an exchange or service or in the
over-the-counter market or (iii) through the writing of options (whether such
options are listed on an options exchange or otherwise) on, or settlement of
short sale of the Shares. Any of such transactions may be effected at market
prices prevailing at the time of sale, at prices related to such prevailing
market prices, at varying prices determined at the time of sale or at negotiated
or fixed prices, in each case as determined by the Selling Shareholder or by
agreement between any Selling Shareholder and underwriters, brokers, dealers or
agents, or purchasers. In connection with sales of the Shares or otherwise, the
Selling Shareholders may enter into hedging transactions with broker-dealers,
which may in turn engage in short sales of the Shares in the course of hedging
the positions they assume. The Selling Shareholders may also sell Shares short
and deliver Shares to close out such short positions, or loan or pledge Shares
to broker-dealers that in turn may sell such Shares.
 
     If the Selling Shareholders effect such transactions by selling Shares to
or through underwriters, brokers, dealers or agents, such underwriters, brokers,
dealers or agents may receive compensation in the form of discounts, concessions
or commissions from the Selling Shareholders or commissions from purchasers of
Shares for whom they may act as agent (which discounts, concessions or
commissions as to particular underwriters, brokers, dealers or agents may be in
excess of those customary in the types of transactions involved). The Selling
Shareholders and any brokers, dealers or agents that participate in the
distribution of the Shares may be deemed to be underwriters, and any profit on
the sale of Shares by them and any discounts, concessions or commission received
by any such underwriters, brokers, dealers or agents may be deemed to be
underwriting discounts and commissions under the Securities Act.
 
     Under the securities laws of certain states, the securities may be sold in
such states only through registered or licensed brokers or dealers. In addition,
in certain states the Shares may not be sold unless the Shares have been
registered or qualified for sale in such state or an exemption from registration
or qualification is available and is complied with.
 
     The Company will pay all of the expenses incident to the registration,
offering and sale of the Shares to the public hereunder other than commissions,
fees and discounts of underwriters, brokers, dealers and agents. The Company has
agreed to indemnify the Selling Shareholders and any underwriters against
certain liabilities, including liabilities under the Securities Act. The Company
will not receive any of the proceeds from the sale of any of the Shares by the
Selling Shareholders.
 
                                 LEGAL MATTERS
 
     The legality of the Preferred Stock and the Common Stock offered hereby has
been passed upon for the Company by McAfee & Taft A Professional Corporation,
Oklahoma City, Oklahoma.
 
                                       33
<PAGE>   35
 
                                    EXPERTS
 
     The consolidated financial statements of the Company for the year ended
June 30, 1995, incorporated by reference in this Prospectus, have been
incorporated herein in reliance on the report of Price Waterhouse LLP,
independent accountants, given on the authority of that firm as experts in
accounting and auditing.
 
     The consolidated financial statements of the Company as of June 30, 1996
and 1997 and December 31, 1997 and for each of the two years ended June 30, 1997
and the six months ended December 31, 1997, incorporated by reference in this
Prospectus, have been incorporated herein in reliance on the report of Coopers &
Lybrand L.L.P., independent accountants, given on the authority of that firm as
experts in accounting and auditing.
 
     Effective July 1, 1996, Price Waterhouse LLP sold its Oklahoma City
practice to Coopers & Lybrand L.L.P. and resigned as the Company's independent
accountants.
 
     The consolidated financial statements of Hugoton Energy Corporation at
December 31, 1997 and 1996, and for each of the three years in the period ended
December 31, 1997, incorporated by reference in this Prospectus and Registration
Statement, have been audited by Ernst & Young LLP, independent auditors, as set
forth in their report thereon, and are incorporated herein in reliance upon such
report given upon the authority of such firm as experts in accounting and
auditing.
 
     Certain estimates of oil and gas reserves included and incorporated by
reference herein were based upon engineering studies prepared by Williamson
Petroleum Consultants, Inc., Porter Engineering Associates and Netherland,
Sewell & Associates, Inc., independent petroleum engineers. Such estimates are
included or incorporated herein in reliance on the authority of each such firm
as experts in such matters.
 
                                       34
<PAGE>   36
 
             ======================================================
 
     NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS AND, IF
GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY THE COMPANY OR ANY OF THE SELLING SHAREHOLDERS. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR SOLICITATION OF AN OFFER TO
BUY, TO ANY PERSON IN ANY JURISDICTION WHERE SUCH OFFER OR SOLICITATION WOULD BE
UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER
SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION
CONTAINED HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.
 
                             ---------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                         PAGE
                                         ----
<S>                                      <C>
Available Information..................     2
Incorporation of Certain Documents by
  Reference............................     2
Forward-Looking Statements.............     3
Prospectus Summary.....................     4
Risk Factors...........................     7
Use of Proceeds........................    15
Ratio of Earnings to Combined Fixed
  Charges and Preferred Stock
  Dividends............................    15
Selling Shareholders...................    15
Description of Preferred Stock.........    21
Description of Common Stock............    29
Federal Income Tax Considerations......    30
Plan of Distribution...................    33
Legal Matters..........................    33
Experts................................    34
</TABLE>
 
             ======================================================
             ======================================================
 
                               CHESAPEAKE ENERGY
                                  CORPORATION
 
                              4,600,000 SHARES OF
                           7% CUMULATIVE CONVERTIBLE
                                PREFERRED STOCK
                                      AND
                              33,093,525 SHARES OF
                                  COMMON STOCK
                           -------------------------
 
                                   PROSPECTUS
                           -------------------------
                                           , 1998
             ======================================================
<PAGE>   37
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The Company has agreed to bear all expenses to be incurred in connection
with the registration of the Shares being offered by the Selling Shareholders.
The Selling Shareholders will bear any underwriting discounts, commissions and
transfer taxes, if any, associated with the sale of the Shares. The Company has
also agreed to indemnify the Selling Shareholders against certain liabilities,
including liabilities under the Securities Act. The following table sets forth
the estimated expenses of the offering. With the exception of the Securities Act
registration fee, all amounts shown are estimates.
 
<TABLE>
<S>                                                           <C>
Securities Act registration fee.............................  $ 67,850
Legal fees..................................................    20,000
Accounting fees.............................................    10,000
Printing expenses...........................................     3,000
Miscellaneous...............................................     4,150
                                                              --------
          Total.............................................  $105,000
                                                              ========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     As permitted by the Oklahoma General Corporation Act under which the
Company is incorporated, the Company's Certificate of Incorporation provides
that the Company shall indemnify each of its officers and directors against (a)
expenses, including attorneys' fees, judgments, fines and amounts paid in
settlement actually and reasonably incurred by him in connection with any
action, suit or proceeding brought by reason of his being or having been a
director, officer, employee or agent of the Company, or of any other
corporation, partnership, joint venture, or other enterprise at the request of
the Company, other than an action by or in the right of the Company, provided
that he acted in good faith and in a manner he reasonably believed to be in or
not opposed to the best interest of the Company, and with respect to any
criminal action, he had no reasonable cause to believe that his conduct was
unlawful and (b) expenses, including attorneys' fees, actually and reasonably
incurred by him in connection with the defense or settlement of any action or
suit by or in the right of the Company brought by reason of his being or having
been a director, officer, employee or agent of the Company, or any other
corporation, partnership, joint venture, or other enterprise at the request of
the Company, provided that he acted in good faith and in a manner he reasonably
believed to be in or not opposed to the best interest of the Company, except
that no indemnification shall be made in respect of any claim, issue or matter
as to which he shall have been adjudged liable to the Company, unless and only
to the extent that the court in which such action was decided has determined
that the person is fairly and reasonably entitled to indemnity for such expenses
which the court deems proper. The Company's bylaws provide for similar
indemnification. These provisions may be sufficiently broad to indemnify such
persons for liabilities arising under the Securities Act of 1933, as amended.
 
     The Company has entered into indemnity agreements with each of its
directors and executive officers. Under each indemnity agreement, the Company
will pay on behalf of the indemnitee, and his executors, administrators and
heirs, any amount which he is or becomes legally obligated to pay because of (i)
any claim or claims from time to time threatened or made against him by any
person because of any act or omission or neglect or breach of duty, including
any actual or alleged error or misstatement or misleading statement, which he
commits or suffers while acting in his capacity as a director and/ or officer of
the Company or an affiliate or (ii) being a party, or being threatened to be
made a party, to any threatened, pending or contemplated action, suit or
proceeding, whether civil, criminal, administrative or investigative, by reason
of the fact that he is or was an officer, director, employee or agent of the
Company or an affiliate or is or was serving at the request of the Company as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise. The payments which the Company will be
obligated to make thereunder shall include, inter alia, damages, charges,
judgments, fines, penalties, settlements and costs,
 
                                      II-1
<PAGE>   38
 
cost of investigation and cost of defense of legal, equitable or criminal
actions, claims or proceedings and appeals therefrom, and costs of attachment,
supersedeas, bail, surety or other bonds. The Company also provides liability
insurance for each of its directors and executive officers.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
     (a) Exhibits
 
<TABLE>
<CAPTION>
        EXHIBIT
        NUMBERS                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          3.1            -- Registrant's Certificate of Incorporation. Incorporated
                            herein by reference to Exhibit 3.1 to Registrant's
                            quarterly report on Form 10-Q for the quarter ended March
                            31, 1998.
          3.2            -- Registrant's Bylaws. Incorporated herein by reference to
                            Exhibit 3.2 to Registrant's registration statement on
                            Form 8-B (No. 001-137200).
          4.1            -- Indenture dated as of March 15, 1997 among the
                            Registrant, as issuer, its subsidiaries signatory
                            thereto, as Subsidiary Guarantors, and United States
                            Trust Company of New York, as Trustee, with respect to
                            7 7/8% Senior Notes due 2004. Incorporated herein by
                            reference to Exhibit 4.1 to Registrant's registration
                            statement on Form S-4 (No. 333-24995). First Supplemental
                            Indenture dated December 17, 1997 and Second Supplemental
                            Indenture dated February 16, 1998. Incorporated herein by
                            reference to Exhibit 4.1.1 to Registrant's transition
                            report on Form 10-K for the six months ended December 31,
                            1997.
          4.1.1*         -- Second [Third] Supplemental Indenture dated April 22,
                            1998 to the Indenture filed herewith as Exhibit 4.1.
          4.2            -- Indenture dated as of March 15, 1997 among the
                            Registrant, as issuer, its subsidiaries signatory
                            thereto, as Subsidiary Guarantors, and United States
                            Trust Company of New York, as Trustee, with respect to
                            8 1/2% Senior Notes due 2012. Incorporated herein by
                            reference to Exhibit 4.1.3 to Registrant's registration
                            statement on Form S-4 (No. 333-24995). First Supplemental
                            Indenture dated December 17, 1997 and Second Supplemental
                            Indenture dated February 16, 1998. Incorporated herein by
                            reference to Exhibit 4.2.1 to Registrant's transition
                            report on Form 10-K for the six months ended December 31,
                            1997.
          4.2.1*         -- Second [Third] Supplemental Indenture dated April 22,
                            1998 to the Indenture filed herewith as Exhibit 4.2.
          4.3            -- Indenture dated as of April 1, 1998 among the Registrant,
                            as issuer, its subsidiaries signatory thereto, as
                            Subsidiary Guarantors, and United States Trust Company of
                            New York, as Trustee, with respect to 9 5/8% Senior Notes
                            due 2005. Incorporated herein by reference to Exhibit 4.3
                            to Registrant's quarterly report on Form 10-Q for the
                            quarter ended March 31, 1998.
          4.4            -- Indenture dated as of April 1, 1996 among the Registrant,
                            its subsidiaries signatory thereto, as Subsidiary
                            Guarantors, and United States Trust Company of New York,
                            as Trustee, with respect to 9 1/8% Senior Notes due 2006.
                            Incorporated herein by reference to Exhibit 4.6 to
                            Registrant's registration statement on Form S-3 (No.
                            333-1588). First Supplemental Indenture dated December
                            30, 1996 and Second Supplemental Indenture dated December
                            17, 1997. Incorporated herein by reference to Exhibit
                            4.4.1 to Registrant's transition report on Form 10-K for
                            the six months ended December 31, 1997.
          4.4.1*         -- Third Supplemental Indenture dated April 22, 1998 to the
                            Indenture filed herewith as Exhibit 4.4.
          4.5            -- Agreement to furnish copies of unfiled long-term debt
                            instruments. Incorporated herein by reference to
                            Registrant's transition report on Form 10-K for the six
                            months ended December 31, 1998.
</TABLE>
 
                                      II-2
<PAGE>   39
 
<TABLE>
<CAPTION>
        EXHIBIT
        NUMBERS                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          4.6            -- Registration Rights Agreement as of April 22, 1998 among
                            the Registrant, its subsidiaries signatory thereto and
                            Donaldson, Lufkin & Jenrette Securities Corporation,
                            Bear, Stearns & Co. Inc., Lehman Brothers Inc., J.P.
                            Morgan Securities Inc. and Morgan Stanley & Co.
                            Incorporated, with respect to 9 5/8% Senior Notes.
                            Incorporated herein by reference to Exhibit 4.12 to
                            Registrant's quarterly report on Form 10-Q for the
                            quarter ended March 31, 1998.
          4.7            -- Registration Rights Agreement as of April 22, 1998 among
                            the Registrant and Donaldson, Lufkin & Jenrette
                            Securities Corporation, Morgan Stanley & Co.
                            Incorporated, Bear, Stearns & Co. Inc., Lehman Brothers
                            Inc. and J.P. Morgan Securities Inc., with respect to 7%
                            Cumulative Convertible Preferred Stock. Incorporated
                            herein by reference to Exhibit 4.11 to Registrant's
                            quarterly report on Form 10-Q for the quarter ended March
                            31, 1998.
          4.8            -- Stock Registration Agreement dated May 21, 1992 between
                            the Registrant and various lenders, as amended by First
                            Amendment thereto dated May 26, 1992. Incorporated herein
                            by reference to Exhibits 10.26.1 and 10.26.2 to
                            Registrant's registration statement on Form S-1 (No.
                            33-55600).
          4.9            -- Registration Rights Agreement dated as of March 10, 1998
                            between the Registrant and certain former shareholders of
                            Hugoton Energy Corporation. Incorporated herein by
                            reference to Exhibit 4.11 to Registrant's registration
                            statement on Form S-4 (No. 333-48735).
          4.10           -- Registration Rights Agreement dated as of December 16,
                            1997 between the Registrant and AnSon Partners Limited
                            Partnership. Incorporated herein by reference to Exhibit
                            4.12 to Registrant's registration statement on Form S-4
                            (No. 333-48735).
          4.11           -- Registration Rights Agreement dated as of October 22,
                            1997 between the Registrant and Charles E. Davidson, as
                            amended by Amendment No. 1 thereto dated December 23,
                            1997. Incorporated herein by reference to Exhibits 4.9
                            and 4.10 to Registrant's registration statement on Form
                            S-4 (No. 333-48735).
          5*             -- Opinion of McAfee & Taft A Professional Corporation
         12*             -- Statement Re Computation of Ratios
         23.1*           -- Consent of Coopers & Lybrand L.L.P.
         23.2*           -- Consent of Price Waterhouse LLP
         23.3*           -- Consent of Ernst & Young LLP
         23.4*           -- Consent of Williamson Petroleum Consultants, Inc.
         23.5*           -- Consent of Netherland, Sewell & Associates, Inc.
         23.6*           -- Consent of Porter Engineering Associates
         23.7*           -- Consent of McAfee & Taft A Professional Corporation
                            (included as part of its opinion filed as Exhibit 5)
         24*             -- Power of Attorney
</TABLE>
 
- ---------------
 
* Filed herewith
 
     (b) Financial Statement Schedules
 
     None
 
                                      II-3
<PAGE>   40
 
ITEM 17. UNDERTAKINGS.
 
     The undersigned Registrant hereby undertakes:
 
     (1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this Registration Statement:
 
          (i) To include any prospectus required by Section 10(a)(3) of the
     Securities Act of 1933;
 
          (ii) To reflect in the prospectus any facts or events arising after
     the effective date of the Registration Statement (or the most recent
     post-effective amendment thereof) which, individually or in the aggregate,
     represent a fundamental change in the information set forth in the
     Registration Statement;
 
          (iii) To include any material information with respect to the plan of
     distribution not previously disclosed in the Registration Statement or any
     material change to such information in the Registration Statement.
 
     Provided, however, that paragraphs (1)(i) and (1)(ii) above do not apply if
the information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed with or furnished to the
Commission by the Registrant pursuant to Section 13 or Section 15(d) of the
Securities Exchange Act of 1934 that are incorporated by reference in the
Registration Statement.
 
     (2) That, for the purpose of determining any liability under the Securities
Act of 1933, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at the time shall be deemed to be the initial bona
fide offering thereof.
 
     (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.
 
     The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
Registration pursuant to the provisions described under Item 20, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.
 
                                      II-4
<PAGE>   41
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Oklahoma City, State of Oklahoma, on the 18th day of
June, 1998.
 
                                            CHESAPEAKE ENERGY CORPORATION
 
                                            By   /s/ AUBREY K. MCCLENDON
                                             -----------------------------------
                                                     Aubrey K. McClendon
                                                    Chairman of the Board
                                                 and Chief Executive Officer
 
     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities indicated on June 18, 1998.
 
<TABLE>
<CAPTION>
                        NAME                                              POSITION
                        ----                                              --------
<C>                                                    <S>
 
               /s/ AUBREY K. MCCLENDON                 Chairman of the Board and Chief Executive
- -----------------------------------------------------    Officer (Principal Executive Officer)
                 Aubrey K. McClendon
 
                   /s/ TOM L. WARD                     President, Chief Operating Officer and
- -----------------------------------------------------    Director (Principal Executive Officer)
                     Tom L. Ward
 
                /s/ MARCUS C. ROWLAND                  Executive Vice President and Chief Financial
- -----------------------------------------------------    Officer (Principal Financial Officer)
                  Marcus C. Rowland
 
                /s/ RONALD A. LEFAIVE                  Senior Vice President -- Accounting,
- -----------------------------------------------------    Controller and Chief Accounting Officer
                  Ronald A. Lefaive                      (Principal Accounting Officer)
 
                /s/ E.F. HEIZER, JR.                   Director
- -----------------------------------------------------
                  E.F. Heizer, Jr.
 
                 /s/ BREENE M. KERR                    Director
- -----------------------------------------------------
                   Breene M. Kerr
 
                 /s/ SHANNON T. SELF                   Director
- -----------------------------------------------------
                   Shannon T. Self
 
             /s/ FREDERICK B. WHITTEMORE               Director
- -----------------------------------------------------
               Frederick B. Whittemore
 
                /s/ WALTER C. WILSON                   Director
- -----------------------------------------------------
                  Walter C. Wilson
</TABLE>
 
                                      II-5
<PAGE>   42
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
        EXHIBIT
        NUMBERS                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          3.1            -- Registrant's Certificate of Incorporation. Incorporated
                            herein by reference to Exhibit 3.1 to Registrant's
                            quarterly report on Form 10-Q for the quarter ended March
                            31, 1998.
          3.2            -- Registrant's Bylaws. Incorporated herein by reference to
                            Exhibit 3.2 to Registrant's registration statement on
                            Form 8-B (No. 001-137200).
          4.1            -- Indenture dated as of March 15, 1997 among the
                            Registrant, as issuer, its subsidiaries signatory
                            thereto, as Subsidiary Guarantors, and United States
                            Trust Company of New York, as Trustee, with respect to
                            7 7/8% Senior Notes due 2004. Incorporated herein by
                            reference to Exhibit 4.1 to Registrant's registration
                            statement on Form S-4 (No. 333-24995). First Supplemental
                            Indenture dated December 17, 1997 and Second Supplemental
                            Indenture dated February 16, 1998. Incorporated herein by
                            reference to Exhibit 4.1.1 to Registrant's transition
                            report on Form 10-K for the six months ended December 31,
                            1997.
          4.1.1*         -- Second [Third] Supplemental Indenture dated April 22,
                            1998 to the Indenture filed herewith as Exhibit 4.1.
          4.2            -- Indenture dated as of March 15, 1997 among the
                            Registrant, as issuer, its subsidiaries signatory
                            thereto, as Subsidiary Guarantors, and United States
                            Trust Company of New York, as Trustee, with respect to
                            8 1/2% Senior Notes due 2012. Incorporated herein by
                            reference to Exhibit 4.1.3 to Registrant's registration
                            statement on Form S-4 (No. 333-24995). First Supplemental
                            Indenture dated December 17, 1997 and Second Supplemental
                            Indenture dated February 16, 1998. Incorporated herein by
                            reference to Exhibit 4.2.1 to Registrant's transition
                            report on Form 10-K for the six months ended December 31,
                            1997.
          4.2.1*         -- Second [Third] Supplemental Indenture dated April 22,
                            1998 to the Indenture filed herewith as Exhibit 4.2.
          4.3            -- Indenture dated as of April 1, 1998 among the Registrant,
                            as issuer, its subsidiaries signatory thereto, as
                            Subsidiary Guarantors, and United States Trust Company of
                            New York, as Trustee, with respect to 9 5/8% Senior Notes
                            due 2005. Incorporated herein by reference to Exhibit 4.3
                            to Registrant's quarterly report on Form 10-Q for the
                            quarter ended March 31, 1998.
          4.4            -- Indenture dated as of April 1, 1996 among the Registrant,
                            its subsidiaries signatory thereto, as Subsidiary
                            Guarantors, and United States Trust Company of New York,
                            as Trustee, with respect to 9 1/8% Senior Notes due 2006.
                            Incorporated herein by reference to Exhibit 4.6 to
                            Registrant's registration statement on Form S-3 (No.
                            333-1588). First Supplemental Indenture dated December
                            30, 1996 and Second Supplemental Indenture dated December
                            17, 1997. Incorporated herein by reference to Exhibit
                            4.4.1 to Registrant's transition report on Form 10-K for
                            the six months ended December 31, 1997.
          4.4.1*         -- Third Supplemental Indenture dated April 22, 1998 to the
                            Indenture filed herewith as Exhibit 4.4.
          4.5            -- Agreement to furnish copies of unfiled long-term debt
                            instruments. Incorporated herein by reference to
                            Registrant's transition report on Form 10-K for the six
                            months ended December 31, 1998.
</TABLE>
<PAGE>   43
 
<TABLE>
<CAPTION>
        EXHIBIT
        NUMBERS                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          4.6            -- Registration Rights Agreement as of April 22, 1998 among
                            the Registrant, its subsidiaries signatory thereto and
                            Donaldson, Lufkin & Jenrette Securities Corporation,
                            Bear, Stearns & Co. Inc., Lehman Brothers Inc., J.P.
                            Morgan Securities Inc. and Morgan Stanley & Co.
                            Incorporated, with respect to 9 5/8% Senior Notes.
                            Incorporated herein by reference to Exhibit 4.12 to
                            Registrant's quarterly report on Form 10-Q for the
                            quarter ended March 31, 1998.
          4.7            -- Registration Rights Agreement as of April 22, 1998 among
                            the Registrant and Donaldson, Lufkin & Jenrette
                            Securities Corporation, Morgan Stanley & Co.
                            Incorporated, Bear, Stearns & Co. Inc., Lehman Brothers
                            Inc. and J.P. Morgan Securities Inc., with respect to 7%
                            Cumulative Convertible Preferred Stock. Incorporated
                            herein by reference to Exhibit 4.11 to Registrant's
                            quarterly report on Form 10-Q for the quarter ended March
                            31, 1998.
          4.8            -- Stock Registration Agreement dated May 21, 1992 between
                            the Registrant and various lenders, as amended by First
                            Amendment thereto dated May 26, 1992. Incorporated herein
                            by reference to Exhibits 10.26.1 and 10.26.2 to
                            Registrant's registration statement on Form S-1 (No.
                            33-55600).
          4.9            -- Registration Rights Agreement dated as of March 10, 1998
                            between the Registrant and certain former shareholders of
                            Hugoton Energy Corporation. Incorporated herein by
                            reference to Exhibit 4.11 to Registrant's registration
                            statement on Form S-4 (No. 333-48735).
          4.10           -- Registration Rights Agreement dated as of December 16,
                            1997 between the Registrant and AnSon Partners Limited
                            Partnership. Incorporated herein by reference to Exhibit
                            4.12 to Registrant's registration statement on Form S-4
                            (No. 333-48735).
          4.11           -- Registration Rights Agreement dated as of October 22,
                            1997 between the Registrant and Charles E. Davidson, as
                            amended by Amendment No. 1 thereto dated December 23,
                            1997. Incorporated herein by reference to Exhibits 4.9
                            and 4.10 to Registrant's registration statement on Form
                            S-4 (No. 333-48735).
          5*             -- Opinion of McAfee & Taft A Professional Corporation
         12*             -- Statement Re Computation of Ratios
         23.1*           -- Consent of Coopers & Lybrand L.L.P.
         23.2*           -- Consent of Price Waterhouse LLP
         23.3*           -- Consent of Ernst & Young LLP
         23.4*           -- Consent of Williamson Petroleum Consultants, Inc.
         23.5*           -- Consent of Netherland, Sewell & Associates, Inc.
         23.6*           -- Consent of Porter Engineering Associates
         23.7*           -- Consent of McAfee & Taft A Professional Corporation
                            (included as part of its opinion filed as Exhibit 5)
         24*             -- Power of Attorney
</TABLE>
 
- ---------------
 
* Filed herewith

<PAGE>   1
                                                                   EXHIBIT 4.1.1

                         SECOND SUPPLEMENTAL INDENTURE
                       TO INDENTURE DATED MARCH 15, 1997
                              (7 7/8% Securities)

                 SECOND SUPPLEMENTAL INDENTURE dated as of April 22, 1998,
among CHESAPEAKE ENERGY CORPORATION, an Oklahoma corporation (the "Company"),
the SUBSIDIARY GUARANTORS listed as signatories hereto, UNITED STATES TRUST
COMPANY OF NEW YORK, a New York corporation, as Trustee to the Indenture (as
such term is defined in Article I below) and CHESAPEAKE ENERGY MARKETING, INC.,
an Oklahoma Corporation ("CEM"), CHESAPEAKE ACQUISITION CORPORATION, an
Oklahoma corporation ("CAC"), CHESAPEAKE MID-CONTINENT CORP., an Oklahoma
corporation ("CMCC"), ANSON GAS MARKETING, an Oklahoma general partnership
("AGM"), MID-CONTINENT GAS PIPELINE COMPANY, an Oklahoma general partnership
("MCGPC"), CHESAPEAKE MERGER CORP., an Oklahoma corporation ("CMC"), CHESAPEAKE
COLUMBIA CORP., an Oklahoma corporation ("CCC"), HUGOTON ENERGY CORPORATION, a
Kansas corporation ("HEC"), HUGOTON EXPLORATION CORPORATION, a Kansas
corporation ("HEX"), HEC TRADING COMPANY, a Texas corporation ("HECTC"),
TIFFANY GATHERING, INC., a Delaware corporation ("TGI") and AMGAS CORPORATION,
a Kansas corporation ("AC").

                 WHEREAS, the Company, the Subsidiary Guarantors and the
Trustee have heretofore entered into the Original Indenture, pursuant to the
provisions of which the Company has heretofore issued $150,000,000 in aggregate
principal amount of the Securities and the First Supplemental Indenture dated
as of December 17, 1997;

                 WHEREAS,  CEM, CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX,
HECTC, TGI and AC are Subsidiaries of the Company;

                 WHEREAS, the Board of Directors of the Company has adopted
resolutions designating CEM, CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC,
TGI and AC as Restricted Subsidiaries, as that term is defined in the
Indenture;

                 WHEREAS, Section 10.3(b) of the Indenture provides, among
other things, that the Company will cause each Subsidiary that shall become a
Restricted Subsidiary after the Issue Date to execute and deliver a
supplemental indenture pursuant to which such Restricted Subsidiary shall
guarantee the payment of the Securities pursuant to the terms of the Indenture;

                 WHEREAS, Section 10.3(c) of the Indenture provides, among
other things, that a Person may become a Subsidiary Guarantor by executing and
delivering to the Trustee (i) a supplemental indenture which is in form and
substance satisfactory to the Trustee and which subjects such Person to the
provisions (including the representations and warranties) of the Indenture as a
Subsidiary Guarantor and (ii) an Opinion of Counsel and Officer's Certificate
that such supplemental indenture has been duly authorized and executed by such
Person and constitutes the legal, valid, binding and enforceable obligation of
such Person;
<PAGE>   2
                 WHEREAS, the form and substance of this Second Supplemental
Indenture are satisfactory to the Trustee;

                 WHEREAS, contemporaneously herewith, there are being delivered
to the Trustee executed opinions of counsel and officers' certificate's proper
in form and substance;

                 WHEREAS, Section 9.1 of the Indenture provides, among other
things, that the Trustee, the Subsidiary Guarantors and the Company may amend
or supplement the Indenture without notice to or consent of any Holder to
reflect the addition of any Subsidiary Guarantor, as provided for by the
Indenture; and

                 WHEREAS, the execution and delivery of this Second
Supplemental Indenture have been duly authorized by the Company, the Subsidiary
Guarantors, CEM, CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC, TGI and AC
and all actions necessary to make this Second Supplemental Indenture a valid
and binding instrument according to its terms and the terms of the Original
Indenture have been performed.

                 NOW, THEREFORE, BY THIS Second SUPPLEMENTAL INDENTURE, for and
in consideration of the premises and of the mutual covenants herein contained
and for other valuable considerations, the receipt whereof is hereby
acknowledged, the Company, the Subsidiary Guarantors, CEM, CAC, CMCC, AGM,
MCGPC, CMC, CCC, HEC, HEX, HECTC, TGI and AC covenant and agree with the
Trustee, for the equal benefit of all present and future Holders of the
Securities, as follows:


                                   ARTICLE I

                                  DEFINITIONS

                 SECTION 1.1     The definitions set forth in or incorporated
by reference in Article I of the Indenture shall be applicable to this Second
Supplemental Indenture, as fully and to the same extent as if set forth herein,
except as otherwise expressly provided herein.  As used in this Second
Supplemental Indenture, the following terms shall have the following meanings:

                 "Indenture" means the Original Indenture, as amended by this
Second Supplemental Indenture, relating to the Securities.

                 "Original Indenture" means the Indenture dated as of March 15,
1997, among the Company, the Subsidiary Guarantors listed as signatories
thereto and the Trustee, relating to the Securities, as amended by: (i) that
certain First Supplemental Indenture dated as of December 17, 1997.





                                     - 2 -
<PAGE>   3
                                   ARTICLE II

                        ADDITION OF SUBSIDIARY GUARANTOR

                 SECTION 2.1     As a Subsidiary Guarantor, each of CEM, CAC, 
CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC, TGI and AC hereby: (a) jointly and
severally, unconditionally guarantees to each Holder and to the Trustee the due
and punctual payment of the principal of, premium, if any, and interest on the
Securities and all other amounts due and payable under the Indenture and the
Securities by the Company, whether at maturity, by acceleration, redemption,
repurchase or otherwise including, without limitation, interest on the overdue
principal of, premium, if any, and interest on the Securities to the extent
lawful, all in accordance with the terms and subject to the limitations of the
Indenture as if each of CEM, CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC,
TGI and AC had been an original party thereto; and (b) subjects each of CEM,
CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC, TGI and AC to the provisions
(including the representations and warranties) of the Indenture as a Subsidiary
Guarantor.


                                  ARTICLE III

                                 MISCELLANEOUS

                 SECTION 3.1     This Second Supplemental Indenture is a 
supplemental indenture pursuant to Section 9.1 of the Indenture.  Upon
execution and delivery of this Second Supplemental Indenture, the terms and
conditions of this Second Supplemental Indenture will be part of the terms and
conditions of the Indenture for any and all purposes, and all the terms and
conditions of both shall be read together as though they constitute one
instrument, except that in case of conflict, the provisions of this Second
Supplemental Indenture will control.

                 SECTION 3.2     Except as they have been modified in this 
Second Supplemental Indenture, each and every term and provision of the
Indenture shall remain in full force and effect.

                 SECTION 3.3     This Second Supplemental Indenture may be 
executed in any number of counterparts, each of which when so executed and
delivered shall be an original, but such counterparts shall together constitute
but one and the same instrument.

                 SECTION 3.4     This Second Supplemental Indenture shall be 
governed by and construed in accordance with the laws of the State of New York
without giving effect to applicable principals of conflicts of law to the
extent that the application of the law of another jurisdiction would be
required thereby.





                                     - 3 -
<PAGE>   4
                                   SIGNATURES

                 IN WITNESS WHEREOF, the parties hereto have caused this Second
Supplemental Indenture to be duly executed as of the date first written above.

                                             CHESAPEAKE ENERGY CORPORATION, an
                                             Oklahoma corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               -------------------------------
                                               Aubrey K. McClendon, Chief 
                                               Executive Officer


                                             UNITED STATES TRUST COMPANY OF
                                             NEW YORK, a New York corporation, 
                                             as Trustee

                                             By /s/ GERARD F. GANEY
                                               -------------------------------
                                               Name: Gerard F. Ganey
                                                    --------------------------
                                               Title: Senior Vice President
                                                     -------------------------


                                             CHESAPEAKE ENERGY MARKETING, INC.,
                                             an Oklahoma Corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               -------------------------------
                                               Aubrey K. McClendon, Chairman


                                             CHESAPEAKE ACQUISITION CORPORATION,
                                             an Oklahoma corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, President


                                             CHESAPEAKE MID-CONTINENT CORP., 
                                             an Oklahoma corporation

                                             By /s/ AUBREY K. MCCLENDON    
                                               --------------------------------
                                               Aubrey K. McClendon, President





                                     - 4 -
<PAGE>   5
                                             ANSON GAS MARKETING, an Oklahoma 
                                             general partnership

                                             By  Chesapeake Mid-Continent Corp.
                                                 an Oklahoma corporation,
                                                 General Partner

                                                 By /s/ AUBREY K. MCCLENDON
                                                   ----------------------------
                                                   Aubrey K. McClendon, 
                                                   President


                                             MID-CONTINENT GAS PIPELINE COMPANY,
                                             an Oklahoma general partnership

                                             By  Chesapeake Mid-Continent Corp.
                                                 an Oklahoma corporation,
                                                 General Partner

                                                 By /s/ AUBREY K. MCCLENDON
                                                   ----------------------------
                                                   Aubrey K. McClendon, 
                                                   President


                                             CHESAPEAKE MERGER CORP., an 
                                             Oklahoma corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, President


                                             CHESAPEAKE COLUMBIA CORP., an 
                                             Oklahoma corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, President


                                             HUGOTON ENERGY CORPORATION, a 
                                             Kansas corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, President





                                     - 5 -
<PAGE>   6
                                             HUGOTON EXPLORATION CORPORATION, 
                                             a Kansas corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, President


                                             HEC TRADING COMPANY, a Texas 
                                             corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, President


                                             TIFFANY GATHERING, INC., a 
                                             Delaware corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, President


                                             AMGAS CORPORATION, a Kansas 
                                             corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, President


                                             SUBSIDIARY GUARANTORS

                                             CHESAPEAKE OPERATING, INC., an 
                                             Oklahoma corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, Chief 
                                               Executive Officer


                                             CHESAPEAKE EXPLORATION LIMITED 
                                             PARTNERSHIP, an Oklahoma limited
                                             partnership

                                             By  Chesapeake Operating, Inc., an 
                                                 Oklahoma corporation, Sole
                                                 General Partner

                                                 By /s/ AUBREY K. MCCLENDON
                                                   ----------------------------
                                                   Aubrey K. McClendon,
                                                   Chief Executive Officer





                                     - 6 -
<PAGE>   7
                                             CHESAPEAKE ENERGY LOUISIANA
                                             CORPORATION, an Oklahoma 
                                             corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, Chief 
                                               Executive Officer


                                             CHESAPEAKE CANADA CORPORATION, an
                                             Alberta, Canada corporation

                                             By /s/ AUBREY K. MCCLENDON
                                               --------------------------------
                                               Aubrey K. McClendon, Chief 
                                               Executive Officer


                                             CHESAPEAKE LOUISIANA, L.P., an
                                             Oklahoma limited partnership

                                             By   Chesapeake Operating, Inc., 
                                                  an Oklahoma corporation,
                                                  Sole General Partner

                                                  By /s/ AUBREY K. MCCLENDON
                                                    ---------------------------
                                                    Aubrey K. McClendon,
                                                    Chief Executive Officer





                                     - 7 -

<PAGE>   1
                                                                   EXHIBIT 4.2.1



                         SECOND SUPPLEMENTAL INDENTURE
                       TO INDENTURE DATED MARCH 15, 1997
                              (8 1/2% Securities)

                 SECOND SUPPLEMENTAL INDENTURE dated as of April 22, 1998,
among CHESAPEAKE ENERGY CORPORATION, an Oklahoma corporation (the "Company"),
the SUBSIDIARY GUARANTORS listed as signatories hereto, UNITED STATES TRUST
COMPANY OF NEW YORK, a New York corporation, as Trustee to the Indenture (as
such term is defined in Article I below) and CHESAPEAKE ENERGY MARKETING, INC.,
an Oklahoma Corporation ("CEM"), CHESAPEAKE ACQUISITION CORPORATION, an
Oklahoma corporation ("CAC"), CHESAPEAKE MID-CONTINENT CORP., an Oklahoma
corporation ("CMCC"), ANSON GAS MARKETING, an Oklahoma general partnership
("AGM"), MID-CONTINENT GAS PIPELINE COMPANY, an Oklahoma general partnership
("MCGPC"), CHESAPEAKE MERGER CORP., an Oklahoma corporation ("CMC"), CHESAPEAKE
COLUMBIA CORP., an Oklahoma corporation ("CCC"), HUGOTON ENERGY CORPORATION, a
Kansas corporation ("HEC"), HUGOTON EXPLORATION CORPORATION, a Kansas
corporation ("HEX"), HEC TRADING COMPANY, a Texas corporation ("HECTC"),
TIFFANY GATHERING, INC., a Delaware corporation ("TGI") and AMGAS CORPORATION,
a Kansas corporation ("AC").

                 WHEREAS, the Company, the Subsidiary Guarantors and the
Trustee have heretofore entered into the Original Indenture, pursuant to the
provisions of which the Company has heretofore issued $150,000,000 in aggregate
principal amount of the Securities and the First Supplemental Indenture dated
as of December 17, 1997;

                 WHEREAS,  CEM, CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX,
HECTC, TGI and AC are Subsidiaries of the Company;

                 WHEREAS, the Board of Directors of the Company has adopted
resolutions designating CEM, CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC,
TGI and AC as Restricted Subsidiaries, as that term is defined in the
Indenture;

                 WHEREAS, Section 10.3(b) of the Indenture provides, among
other things, that the Company will cause each Subsidiary that shall become a
Restricted Subsidiary after the Issue Date to execute and deliver a
supplemental indenture pursuant to which such Restricted Subsidiary shall
guarantee the payment of the Securities pursuant to the terms of the Indenture;

                 WHEREAS, Section 10.3(c) of the Indenture provides, among
other things, that a Person may become a Subsidiary Guarantor by executing and
delivering to the Trustee (i) a supplemental indenture which is in form and
substance satisfactory to the Trustee and which subjects such Person to the
provisions (including the representations and warranties) of the Indenture as a
Subsidiary Guarantor and (ii) an Opinion of Counsel and Officer's Certificate
that such supplemental indenture has been duly authorized and executed by such
Person and constitutes the legal, valid, binding and enforceable obligation of
such Person;
<PAGE>   2
                 WHEREAS, the form and substance of this Second Supplemental
Indenture are satisfactory to the Trustee;

                 WHEREAS, contemporaneously herewith, there are being delivered
to the Trustee executed opinions of counsel and officers' certificate's proper
in form and substance;

                 WHEREAS, Section 9.1 of the Indenture provides, among other
things, that the Trustee, the Subsidiary Guarantors and the Company may amend
or supplement the Indenture without notice to or consent of any Holder to
reflect the addition of any Subsidiary Guarantor, as provided for by the
Indenture; and

                 WHEREAS, the execution and delivery of this Second
Supplemental Indenture have been duly authorized by the Company, the Subsidiary
Guarantors, CEM, CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC, TGI and AC
and all actions necessary to make this Second Supplemental Indenture a valid
and binding instrument according to its terms and the terms of the Original
Indenture have been performed.

                 NOW, THEREFORE, BY THIS Second SUPPLEMENTAL INDENTURE, for and
in consideration of the premises and of the mutual covenants herein contained
and for other valuable considerations, the receipt whereof is hereby
acknowledged, the Company, the Subsidiary Guarantors, CEM, CAC, CMCC, AGM,
MCGPC, CMC, CCC, HEC, HEX, HECTC, TGI and AC covenant and agree with the
Trustee, for the equal benefit of all present and future Holders of the
Securities, as follows:


                                   ARTICLE I

                                  DEFINITIONS

                 SECTION 1.1      The definitions set forth in or incorporated
by reference in Article I of the Indenture shall be applicable to this Second
Supplemental Indenture, as fully and to the same extent as if set forth herein,
except as otherwise expressly provided herein.  As used in this Second
Supplemental Indenture, the following terms shall have the following meanings:

                 "Indenture" means the Original Indenture, as amended by this
Second Supplemental Indenture, relating to the Securities.

                 "Original Indenture" means the Indenture dated as of March 15,
1997, among the Company, the Subsidiary Guarantors listed as signatories
thereto and the Trustee, relating to the Securities, as amended by: (i) that
certain First Supplemental Indenture dated as of December 17, 1997.
<PAGE>   3
                                   ARTICLE II

                        ADDITION OF SUBSIDIARY GUARANTOR

                 SECTION 2.1      As a Subsidiary Guarantor, each of CEM, CAC,
CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC, TGI and AC hereby: (a) jointly and
severally, unconditionally guarantees to each Holder and to the Trustee the due
and punctual payment of the principal of, premium, if any, and interest on the
Securities and all other amounts due and payable under the Indenture and the
Securities by the Company, whether at maturity, by acceleration, redemption,
repurchase or otherwise including, without limitation, interest on the overdue
principal of, premium, if any, and interest on the Securities to the extent
lawful, all in accordance with the terms and subject to the limitations of the
Indenture as if each of CEM, CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC,
TGI and AC had been an original party thereto; and (b) subjects each of CEM,
CAC, CMCC, AGM, MCGPC, CMC, CCC, HEC, HEX, HECTC, TGI and AC to the provisions
(including the representations and warranties) of the Indenture as a Subsidiary
Guarantor.


                                  ARTICLE III

                                 MISCELLANEOUS

                 SECTION 3.1      This Second Supplemental Indenture is a
supplemental indenture pursuant to Section 9.1 of the Indenture.  Upon
execution and delivery of this Second Supplemental Indenture, the terms and
conditions of this Second Supplemental Indenture will be part of the terms and
conditions of the Indenture for any and all purposes, and all the terms and
conditions of both shall be read together as though they constitute one
instrument, except that in case of conflict, the provisions of this Second
Supplemental Indenture will control.

                 SECTION 3.2      Except as they have been modified in this
Second Supplemental Indenture, each and every term and provision of the
Indenture shall remain in full force and effect.

                 SECTION 3.3      This Second Supplemental Indenture may be
executed in any number of counterparts, each of which when so executed and
delivered shall be an original, but such counterparts shall together constitute
but one and the same instrument.

                 SECTION 3.4      This Second Supplemental Indenture shall be
governed by and construed in accordance with the laws of the State of New York
without giving effect to applicable principals of conflicts of law to the
extent that the application of the law of another jurisdiction would be
required thereby.
<PAGE>   4
                                   SIGNATURES

                 IN WITNESS WHEREOF, the parties hereto have caused this Second
Supplemental Indenture to be duly executed as of the date first written above.

                                       CHESAPEAKE ENERGY CORPORATION, an
                                       Oklahoma corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, Chief
                                          Executive Officer


                                       UNITED STATES TRUST COMPANY OF NEW
                                       YORK, a New York corporation, as Trustee

                                       By /s/ GERARD F. GANEY
                                          -------------------------------------
                                         Name: Gerard F. Ganey
                                               --------------------------------
                                         Title: Senior Vice President
                                                -------------------------------


                                       CHESAPEAKE ENERGY MARKETING, INC., an 
                                       Oklahoma Corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, Chairman


                                       CHESAPEAKE ACQUISITION CORPORATION, an 
                                       Oklahoma corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President


                                       CHESAPEAKE MID-CONTINENT CORP., an 
                                       Oklahoma corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President
<PAGE>   5
                                       ANSON GAS MARKETING, an Oklahoma general
                                       partnership

                                       By Chesapeake Mid-Continent Corp., an 
                                          Oklahoma corporation, General Partner
                                       
                                          By  /s/ AUBREY K. MCCLENDON
                                            ------------------------------------
                                            Aubrey K. McClendon, President


                                       MID-CONTINENT GAS PIPELINE COMPANY, an 
                                       Oklahoma general partnership

                                       By Chesapeake Mid-Continent Corp., an 
                                          Oklahoma corporation, General Partner

                                          By  /s/ AUBREY K. MCCLENDON
                                            ------------------------------------
                                            Aubrey K. McClendon, President


                                       CHESAPEAKE MERGER CORP., an Oklahoma 
                                       corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President


                                       CHESAPEAKE COLUMBIA CORP., an Oklahoma 
                                       corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President


                                       HUGOTON ENERGY CORPORATION, a Kansas 
                                       corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President


                                       HUGOTON EXPLORATION CORPORATION, a 
                                       Kansas corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President
<PAGE>   6
                                       HEC TRADING COMPANY, a Texas corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President


                                       TIFFANY GATHERING, INC., a Delaware 
                                       corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President


                                       AMGAS CORPORATION, a Kansas corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, President


                                       SUBSIDIARY GUARANTORS

                                       CHESAPEAKE OPERATING, INC., an Oklahoma
                                       corporation

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, Chief Executive 
                                          Officer


                                       CHESAPEAKE EXPLORATION LIMITED 
                                       PARTNERSHIP, an Oklahoma limited 
                                       partnership

                                       By  Chesapeake Operating, Inc., an
                                           Oklahoma corporation, Sole
                                           General Partner

                                           By  /s/ AUBREY K. MCCLENDON
                                             ----------------------------------
                                             Aubrey K. McClendon, Chief 
                                             Executive Officer

                                       CHESAPEAKE ENERGY LOUISIANA CORPORATION,
                                       an Oklahoma corporation

                                       By   /s/ AUBREY K. MCCLENDON
                                           ------------------------------------
                                           Aubrey K. McClendon, Chief Executive
                                           Officer


                                       CHESAPEAKE CANADA CORPORATION, an 
                                       Alberta, Canada corporation 

                                       By  /s/ AUBREY K. MCCLENDON
                                          -------------------------------------
                                          Aubrey K. McClendon, Chief Executive 
                                          Officer


                                       CHESAPEAKE LOUISIANA, L.P., an Oklahoma 
                                       limited partnership

                                       By  Chesapeake Operating, Inc., an
                                           Oklahoma corporation, Sole
                                           General Partner

                                           By  /s/ AUBREY K. MCCLENDON
                                             ----------------------------------
                                             Aubrey K. McClendon, Chief 
                                             Executive Officer




<PAGE>   1
                                                                   EXHIBIT 4.4.1



                          THIRD SUPPLEMENTAL INDENTURE
                        TO INDENTURE DATED APRIL 1, 1996


         THIRD SUPPLEMENTAL INDENTURE dated as of April 22, 1998, among
CHESAPEAKE ENERGY CORPORATION, an Oklahoma corporation (the "Company"), the
SUBSIDIARY GUARANTORS listed as signatories hereto, UNITED STATES TRUST COMPANY
OF NEW YORK, a New York corporation, as Trustee to the Indenture (as such term
is defined in Article I below) and CHESAPEAKE ACQUISITION CORPORATION, an
Oklahoma corporation ("CAC"), CHESAPEAKE MID-CONTINENT CORP., an Oklahoma
corporation ("CMCC"), ANSON GAS MARKETING, an Oklahoma general partnership
("AGM"), MID-CONTINENT GAS PIPELINE COMPANY, an Oklahoma general partnership
("MCGPC"), CHESAPEAKE MERGER CORP., an Oklahoma corporation ("CMC"), CHESAPEAKE
GOTHIC CORP., an Oklahoma corporation ("CGC"), HUGOTON ENERGY CORPORATION, a
Kansas corporation ("HEC"), HUGOTON EXPLORATION CORPORATION, a Kansas
corporation ("HEX"), HEC TRADING COMPANY, a Texas corporation ("HECTC"), TIFFANY
GATHERING, INC., a Delaware corporation ("TGI") and AMGAS CORPORATION, a Kansas
corporation ("AC").

         WHEREAS, the Company, the Subsidiary Guarantors and the Trustee have
heretofore entered into the Original Indenture, pursuant to the provisions of
which the Company has heretofore issued $120,000,000 in aggregate principal
amount of the Securities, the First Supplemental Indenture dated December 30,
1996, and the Second Supplemental Indenture dated December 17, 1997;

         WHEREAS, CAC, CMCC, AGM, MCGPC, CMC, CGC, HEC, HEX, HECTC, TGI and AC
are Subsidiaries of the Company;

         WHEREAS, the Board of Directors of the Company has adopted resolutions
designating CAC, CMCC, AGM, MCGPC, CMC, CGC, HEC, HEX, HECTC, TGI and AC as
Restricted Subsidiaries, as that term is defined in the Indenture;

         WHEREAS, Section 10.03(a) of the Indenture provides, among other
things, that the Company will cause each Subsidiary that shall become a
Restricted Subsidiary after the Issue Date to execute and deliver a supplemental
indenture pursuant to which such Restricted Subsidiary shall guarantee the
payment of the Securities pursuant to the terms of the Indenture;

         WHEREAS, Section 10.03(b) of the Indenture provides, among other
things, that a Person may become a Subsidiary Guarantor by executing and
delivering to the Trustee (i) a supplemental indenture which is in form and
substance satisfactory to the Trustee and which subjects such Person to the
provisions (including the representations and warranties) of the Indenture as a
Subsidiary Guarantor and (ii) an Opinion of Counsel and Officer's Certificate
that such supplemental indenture has been duly authorized and executed by such
Person and constitutes the legal, valid, binding and enforceable obligation of
such Person;



<PAGE>   2



         WHEREAS, the form and substance of this Third Supplemental Indenture
are satisfactory to the Trustee;

         WHEREAS, contemporaneously herewith, there are being delivered to the
Trustee executed opinions of counsel and officers' certificate's proper in form
and substance;

         WHEREAS, Section 9.01 of the Indenture provides, among other things,
that the Trustee, the Subsidiary Guarantors and the Company may amend or
supplement the Indenture without notice to or consent of any Holder to reflect
the addition of any Subsidiary Guarantor, as provided for by the Indenture; and

         WHEREAS, the execution and delivery of this Third Supplemental
Indenture have been duly authorized by the Company, the Subsidiary Guarantors,
CAC, CMCC, AGM, MCGPC, CMC, CGC, HEC, HEX, HECTC, TGI and AC and all actions
necessary to make this Third Supplemental Indenture a valid and binding
instrument according to its terms and the terms of the Original Indenture have
been performed.

         NOW, THEREFORE, BY THIS THIRD SUPPLEMENTAL INDENTURE, for and in
consideration of the premises and of the mutual covenants herein contained and
for other valuable considerations, the receipt whereof is hereby acknowledged,
the Company, the Subsidiary Guarantors, CAC, CMCC, AGM, MCGPC, CMC, CGC, HEC,
HEX, HECTC, TGI and AC covenant and agree with the Trustee, for the equal
benefit of all present and future Holders of the Securities, as follows:


                                    ARTICLE I

                                   DEFINITIONS

         SECTION 1.1 The definitions set forth in or incorporated by reference
in Article I of the Indenture shall be applicable to this Third Supplemental
Indenture, as fully and to the same extent as if set forth herein, except as
otherwise expressly provided herein. As used in this Third Supplemental
Indenture, the following terms shall have the following meanings:

         "Indenture" means the Original Indenture, as amended by this Third
Supplemental Indenture, relating to the Securities.

         "Original Indenture" means the Indenture dated as of April 1, 1996,
among the Company, the Subsidiary Guarantors listed as signatories thereto and
the Trustee, relating to the Securities, as amended by: (i) that certain First
Supplemental Indenture dated as of December 30, 1996 and (ii) that certain
Second Supplemental Indenture dated as of December 17, 1997.




                                      - 2 -


<PAGE>   3



                                   ARTICLE II

                        ADDITION OF SUBSIDIARY GUARANTOR

         SECTION 2.1 As a Subsidiary Guarantor, each of CAC, CMCC, AGM, MCGPC,
CMC, CGC, HEC, HEX, HECTC, TGI and AC hereby: (a) jointly and severally,
unconditionally guarantees to each Holder and to the Trustee the due and
punctual payment of the principal of, premium, if any, and interest on the
Securities and all other amounts due and payable under the Indenture and the
Securities by the Company, whether at maturity, by acceleration, redemption,
repurchase or otherwise including, without limitation, interest on the overdue
principal of, premium, if any, and interest on the Securities to the extent
lawful, all in accordance with the terms and subject to the limitations of the
Indenture as if each of CAC, CMCC, AGM, MCGPC, CMC, CGC, HEC, HEX, HECTC, TGI
and AC had been an original party thereto; and (b) subjects each of CAC, CMCC,
AGM, MCGPC, CMC, CGC, HEC, HEX, HECTC, TGI and AC to the provisions (including
the representations and warranties) of the Indenture as a Subsidiary Guarantor.


                                   ARTICLE III

                                  MISCELLANEOUS

         SECTION 3.1 This Third Supplemental Indenture is a supplemental
indenture pursuant to Section 9.01 of the Indenture. Upon execution and delivery
of this Third Supplemental Indenture, the terms and conditions of this Third
Supplemental Indenture will be part of the terms and conditions of the Indenture
for any and all purposes, and all the terms and conditions of both shall be read
together as though they constitute one instrument, except that in case of
conflict, the provisions of this Third Supplemental Indenture will control.

         SECTION 3.2 Except as they have been modified in this Third
Supplemental Indenture, each and every term and provision of the Indenture shall
remain in full force and effect.

         SECTION 3.3 This Third Supplemental Indenture may be executed in any
number of counterparts, each of which when so executed and delivered shall be an
original, but such counterparts shall together constitute but one and the same
instrument.

         SECTION 3.4 This Third Supplemental Indenture shall be governed by and
construed in accordance with the laws of the State of New York without giving
effect to applicable principals of conflicts of law to the extent that the
application of the law of another jurisdiction would be required thereby.




                                      - 3 -


<PAGE>   4



                                   SIGNATURES

         IN WITNESS WHEREOF, the parties hereto have caused this Third
Supplemental Indenture to be duly executed as of the date first written above.

                                CHESAPEAKE ENERGY CORPORATION, an
                                Oklahoma corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                UNITED STATES TRUST COMPANY OF NEW
                                YORK, a New York corporation, as Trustee

                                By  /s/ GERARD F. GANEY
                                   ---------------------------------------------
                                   Name: Gerard F. Ganey
                                        ----------------------------------------
                                   Title: Senior Vice President
                                         ---------------------------------------

                                CHESAPEAKE ENERGY MARKETING, INC., an
                                Oklahoma Corporation


                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                CHESAPEAKE ACQUISITION CORPORATION,
                                an Oklahoma corporation


                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                CHESAPEAKE MID-CONTINENT CORP., an
                                Oklahoma corporation


                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President





                                      - 4 -


<PAGE>   5



                                ANSON GAS MARKETING, an Oklahoma general
                                partnership

                                By    Chesapeake Mid-Continent Corp., an
                                      Oklahoma corporation, General Partner

                                      By /s/ AUBREY K. MCCLENDON
                                        ----------------------------------------
                                         Aubrey K. McClendon, President


                                MID-CONTINENT GAS PIPELINE COMPANY,
                                an Oklahoma general partnership

                                By    Chesapeake Mid-Continent Corp., an
                                      Oklahoma corporation, General Partner


                                      By /s/ AUBREY K. MCCLENDON
                                        ----------------------------------------
                                         Aubrey K. McClendon, President


                                CHESAPEAKE MERGER CORP., an Oklahoma
                                corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                CHESAPEAKE GOTHIC CORP., an Oklahoma
                                corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                HUGOTON ENERGY CORPORATION, a Kansas
                                corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President




                                      - 5 -


<PAGE>   6



                                HUGOTON EXPLORATION CORPORATION, a
                                Kansas corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                HEC TRADING COMPANY, a Texas corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                TIFFANY GATHERING, INC., a Delaware
                                corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                AMGAS CORPORATION, a Kansas corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                SUBSIDIARY GUARANTORS

                                CHESAPEAKE OPERATING, INC., an Oklahoma
                                corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                CHESAPEAKE EXPLORATION LIMITED
                                PARTNERSHIP, an Oklahoma limited partnership

                                By    Chesapeake Operating, Inc., an Oklahoma
                                      corporation, Sole General Partner

                                      By /s/ AUBREY K. MCCLENDON
                                        ----------------------------------------
                                         Aubrey K. McClendon,
                                         Chief Executive Officer



                                      - 6 -


<PAGE>   7


                                CHESAPEAKE ENERGY LOUISIANA
                                CORPORATION, an Oklahoma corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                CHESAPEAKE CANADA CORPORATION, an
                                Alberta, Canada corporation

                                By  /s/ AUBREY K. MCCLENDON
                                   ---------------------------------------------
                                   Aubrey K. McClendon, President


                                CHESAPEAKE LOUISIANA, L.P., an
                                Oklahoma limited partnership

                                By    Chesapeake Operating, Inc., an
                                      Oklahoma corporation, Sole General Partner

                                      By /s/ AUBREY K. MCCLENDON
                                        ----------------------------------------
                                         Aubrey K. McClendon,
                                         Chief Executive Officer





                                      - 7 -


<PAGE>   1
                                                                       EXHIBIT 5



                           [McAFEE & TAFT LETTERHEAD]



                                 June 18, 1998



Chesapeake Energy Corporation
6100 North Western Avenue
Oklahoma City, Oklahoma 73118

                                          RE: Registration Statement on Form S-3

Ladies and Gentlemen:

     We have examined the Registration Statement to be filed with the
Securities and Exchange Commission by Chesapeake Energy Corporation (the
"Company") with respect to shares of the Company's 7% Cumulative Convertible
Preferred Stock, $.01 par value per share (the "Preferred Stock"), together
with shares of the Company's common stock, par value $.01 per share, into which
the Preferred Stock may be converted or for which it may be redeemed (the
"Common Stock"; together with the Preferred Stock, the "Shares") which may be
resold by the selling shareholders named therein. We have also examined certain
corporate records of the Company and have made such other investigations as we
have deemed appropriate in order to render the opinions expressed herein.

     Based upon the foregoing, we are of the opinion that:

     1.   The Company is a corporation duly organized and validly existing
under the laws of the State of Oklahoma; and

     2.   The Shares have been validly issued and are fully paid and
nonassessable.

     We hereby consent to the inclusion of this opinion as an exhibit to the
Registration Statement and to the reference to our firm under the caption
"Legal Matters" in the Prospectus which is a part of the Registration Statement.

                                                    Very truly yours,

                                                    /s/ McAFEE & TAFT
                                                    -----------------

                                                    McAFEE & TAFT A Professional
                                                    Corporation

<PAGE>   1
                                  Exhibit 12
                                      
                                      
                        CHESAPEAKE ENERGY CORPORATION
                            CALCULATION OF RATIOS
                                      

<TABLE>
<CAPTION>
                                                                                                                       Six Months  
                                                                                                                         Ended     
                                                             Years Ended June 30,                                       Dec. 31,
                                                       1993           1994        1995         1996        1997           1996     
                                                       ----           ----        ----         ----        ----           ----     
<S>                                                      <C>          <C>         <C>          <C>        <C>             <C>      
RATIO OF EARNINGS TO FIXED CHARGES
     Income before income taxes and
       extraordinary item                            $   (464)     $  5,155     $ 17,960     $ 36,209    $(180,330)     $ 39,246   
     Interest                                           2,282         2,676        6,627       13,679       18,550         6,216   
     Preferred Stock Dividends                            385
     Bond discount amortization (a)                      --            --           --           --           --            --     
     Loan cost
     amortization                                         127           557          548        1,288        1,455           762   
                                                     --------      --------     --------     --------     --------      --------   
     Earnings                                        $  2,330      $  8,388     $ 25,135     $ 51,176    $(160,325)     $ 46,224   

     Interest expense                                   2,282         2,676        6,627       13,679       18,550         6,216   
     Capitalized interest                                 192           356        1,574        6,428       12,935         7,607   
     Preferred Stock Dividends                            385
     Bond discount amortization (a)                      --            --           --           --           --            --     
     Loan cost amortization                               127           557          548        1,288        1,455           762   
                                                     --------      --------     --------     --------     --------      --------   
     Fixed Charges                                      2,986         3,589        8,749       21,395       32,940        14,585   
     Ratio                                                n/a           2.3          2.9          2.4         (4.9)          3.2   

(A) Bond discount excluded since its included in
    interest expense

    Insufficient  coverage                                656             0            0            0      193,265             0   
</TABLE>

<TABLE>
<CAPTION>
                                                                 Six Months      Year      Three Months  Three Months   12 Months
                                                                   Ended         Ended        Ended         Ended         Ended
                                                                  Dec. 31,      Dec. 31,      Mar. 31,     Mar. 31,      Mar. 31,
                                                                    1997          1997          1997         1998          1998
                                                                    ----          ----          ----         ----          ----
<S>                                                                <C>          <C>             <C>        <C>           <C>      
RATIO OF EARNINGS TO FIXED CHARGES
        Income before income taxes and
          extraordinary item                                       (31,574)     (251,150)       25,360     (256,500)     (533,010)
        Interest                                                    17,448        29,782         3,654       10,688        36,816
        Preferred Stock Dividends

        Bond discount amortization (a)                                --            --            --           --            --
        Loan cost amortization                                         794         1,487           300          396         1,583
                                                                  --------      --------      --------     --------      --------
        Earnings                                                   (13,332)     (219,881)       29,314     (245,416)     (494,611)

        Interest expense                                            17,448        29,782         3,654       10,688        36,816
        Capitalized interest                                         5,087        10,415         2,744        2,252         9,923
        Preferred Stock Dividends

        Bond discount amortization (a)                                --            --            --           --            --
        Loan cost amortization                                         794         1,487           300          396         1,583
                                                                  --------      --------      --------     --------      --------
        Fixed Charges                                               23,329        41,684         6,698       13,336        48,322
        Ratio                                                         (0.6)         (5.3)          4.4        (18.4)        (10.2)
(A) Bond discount excluded since its included in interest expense

        Insufficient coverage                                       36,661       261,565             0      258,752       542,933


PRO FORMA RATIO OF EARNINGS TO FIXED CHARGES
        Income before income taxes and extraordinary item                                                                (587,785)
        Interest                                                                                                           75,448
        Preferred stock dividends                                                                                          16,100
        Bond discount amortization (A)                                                                                          -
        Loan cost amortization                                                                                              1,583
                                                                                                                         --------
        Earnings                                                                                                         (494,654)

        Interest expense                                                                                                   75,448
        Capitalized interest                                                                                                9,923
        Preferred stock dividends                                                                                          16,100
        Bond discount amortization (A)                                                                                          -
        Loan cost amortization                                                                                              1,583
                                                                                                                         --------
        Fixed Charges                                                                                                     103,054
        Ratio                                                                                                                (4.8)
(A) Bond discount excluded since its included in interest expense

Insufficient Coverage                                                                                                     597,708
</TABLE>


<PAGE>   1
                                                                    EXHIBIT 23.1


                       CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in this registration statement on
Form S-3 of our report dated March 20, 1998, on our audits of the consolidated
financial statements of Chesapeake Energy Corporation as of December 31, 1997
and for the six month period then ended, and as of June 30, 1997 and 1996 and
for the years then ended. We also consent to the references to our firm under
the caption "Experts".


                                                    /s/ COOPERS & LYBRAND L.L.P.
                                                    ----------------------------
                                                        COOPERS & LYBRAND L.L.P.


Oklahoma City, Oklahoma
June 17, 1998 

<PAGE>   1
                                                                    EXHIBIT 23.2



                       CONSENT OF INDEPENDENT ACCOUNTANTS



We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 of Chesapeake
Energy Corporation of our report dated September 20, 1995, except for the
fourth paragraph of Note 9 which is as of October 9, 1997, and except for the
earnings per share information as described in Note 1, which is as of March 24,
1998, appearing on page 39 of the Company's Annual Report on Form 10K for the
year ended December 31, 1997. We also consent to the reference to us under the
heading "Experts".



/s/ PRICE WATERHOUSE LLP
PRICE WATERHOUSE LLP



Houston, Texas
June 17, 1998

<PAGE>   1
                                                                    EXHIBIT 23.3



                         CONSENT OF INDEPENDENT AUDITORS



We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3 dated June 19, 1998) and related Prospectus of
Chesapeake Energy Corporation for the registration of 4,600,000 shares of its
7% cumulative convertible preferred stock and 33,093,525 shares of its common
stock and to the incorporation by reference therein of our report dated March
24, 1998, with respect to the consolidated financial statements and schedules
of Hugoton Energy Corporation included in its Annual Report (Form 10-K) for the
year ended December 31, 1997, filed with the Securities and Exchange Commission.


                                                  /s/ ERNST & YOUNG LLP
                                                      ERNST & YOUNG LLP

Wichita, Kansas
June 16, 1998

<PAGE>   1
              [WILLIAMSON PETROLEUM CONSULTANTS, INC. LETTERHEAD]


                                                                    EXHIBIT 23.4


               CONSENT OF WILLIAMSON PETROLEUM CONSULTANTS, INC.


As independent oil and gas consultants, Williamson Petroleum Consultants, Inc.
hereby consents to the references to our firm and to our reserve report entitled
"Evaluation of Oil and Gas Reserves to the Interests of Chesapeake Energy
Corporation in Certain Properties in Louisiana and Texas, Effective December 31,
1997, for Disclosure to the Securities and Exchange Commission, Williamson
Project 7.8569" dated March 12, 1998 in the Transition Report on Form 10-K of
Chesapeake Energy Corporation incorporated by reference into the Prospectus
constituting part of the Registration on Form S-3 of Chesapeake Energy
Corporation to be filed with the Securities and Exchange Commission on or about
June 19, 1998.

                                      /s/ WILLIAMSON PETROLEUM CONSULTANTS, INC.
                                      ------------------------------------------
                                          WILLIAMSON PETROLEUM CONSULTANTS, INC.




Houston, Texas
June 19, 1998





<PAGE>   1
                                                                    EXHIBIT 23.5



               [NETHERLAND, SEWELL & ASSOCIATES, INC. LETTERHEAD]




           CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS


     As independent oil and gas consultants, Netherland, Sewell & Associates,
Inc. hereby consents to the references to our firm and to our reserve report
dated December 31, 1997 in the Transition Report on Form 10-K of Chesapeake
Energy Corporation incorporated by reference into the Prospectus constituting
part of the Registration Statement on Form S-3 of Chesapeake Energy Corporation
to be filed with the Securities and Exchange Commission on or about June 19,
1998.


                                   NETHERLAND, SEWELL & ASSOCIATES, INC.



                                   By:   /s/ FREDERIC D. SEWELL
                                        ----------------------------------------
                                        Frederic D. Sewell
                                        President


Dallas, Texas
June 19, 1998

<PAGE>   1
                                                                    EXHIBIT 23.6

                    CONSENT OF PORTER ENGINEERING ASSOCIATES

     As independent oil and gas consultants, Porter Engineering Associates
hereby consents to the references to our firm and to our reserve report dated
December 31, 1997 in the Transition Report on Form 10-K of Chesapeake Energy
Corporation incorporated by reference into the Prospectus constituting part of
the Registration Statement on Form S-3 of Chesapeake Energy Corporation to be
filed with the Securities and Exchange Commission on or about June 19, 1998.

                                       PORTER ENGINEERING ASSOCIATES


                                       By: /s/ JOE H. PORTER
                                           -------------------------------------
                                               Joe H. Porter, PE


Oklahoma City, Oklahoma
June 19, 1998

<PAGE>   1
                                                                      EXHIBIT 24

                               POWER OF ATTORNEY
                               (Preferred Stock)

     We, the undersigned officers and directors of Chesapeake Energy
Corporation (hereinafter, the "Company"), hereby severally constitute and
appoint Aubrey K. McClendon, Tom L. Ward and Marcus C. Rowland, and each of
them, severally, our true and lawful attorneys-in-fact and agents, each with
full power to act without the other and with full power of substitution and
resubstitution, to sign for us, in our names as officers or directors, or both,
of the Company, and file with the Securities and Exchange Commission and any
state securities regulatory board or commission any documents relating to the
securities offered pursuant to this Registration Statement on Form S-3,
including any amendments to this Registration Statement on Form S-3 (including
post-effective amendments) and any registration statement for the same offering
that is to be effective upon filing pursuant to Rule 462(b) under the
Securities Act of 1933 and any documents required to be filed with respect
thereto, granting unto said attorneys-in-fact and agents, and each of them,
full power and authority to do and to perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as each of us might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents, or any of
them, or their substitutes, may lawfully do or cause to be done by virtue
hereof.

     DATED this 18th day of June, 1998.


/s/ Aubrey K. McClendon                           /s/ Tom L. Ward
- --------------------------------                  -----------------------------
Aubrey K. McClendon, Chairman                     Tom L. Ward, President, Chief
of the Board and Chief Executive                  Operating Officer and
Officer (Principal Executive                      Director (Principal Executive
Officer)                                          Officer)


/s/ Marcus C. Rowland                             /s/ Ronald A. Lefaive
- --------------------------------                  -----------------------------
Marcus C. Rowland, Executive                      Ronald A. Lefaive, Senior   
Vice President and Chief                          Vice President - Accounting
Financial Officer (Principal                      and Controller (Principal
Financial Officer)                                Accounting Officer)


/s/ E.F. Heizer, Jr.                              /s/ Breene M. Kerr
- --------------------------------                  -----------------------------
E.F. Heizer, Jr., Director                        Breene M. Kerr, Director


/s/ Shannon T. Self                               /s/ Frederick B. Whittemore
- --------------------------------                  -----------------------------
Shannon T. Self, Director                         Frederick B. Whittemore, 
                                                  Director

/s/ Walter C. Wilson
- --------------------------------
Walter C. Wilson, Director


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