ATMOS ENERGY CORP
8-K, 1997-11-13
NATURAL GAS DISTRIBUTION
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                   Form 8-K


                   Current Report Pursuant to Section 13 or
                 15(d) of the Securities Exchange Act of 1934


               Date of Report (Date of earliest event reported)
                               NOVEMBER 12, 1997



                           ATMOS ENERGY CORPORATION
            (Exact Name of Registrant as Specified in its Charter)

 

    Texas and Virginia                 1-10042                     75-1743247
- - ----------------------------    ---------------------        -------------------
(State or Other Jurisdiction    (Commission File No.)        (IRS Employer
 of Incorporation                                            Identification No.)



1800 Three Lincoln Centre
5430 LBJ Freeway, Dallas, Texas                                     75240
- - ----------------------------------------                         ----------
(Address of Principal Executive Offices)                         (Zip Code)


              Registrant's Telephone Number, Including Area Code
                                (972) 934-9227
                                --------------



         ------------------------------------------------------------
         (Former Name or Former Address, if Changed Since Last Report)
<PAGE>
 
Item 5.  Other Events.

     On November 12, 1997, the Board of Directors of Atmos Energy Corporation
(the "Company") declared a dividend distribution of one Right for each
outstanding share of the Company's Common Stock to shareholders of record at the
close of business on May 10, 1998 (the "Record Date").  Each Right entitles the
registered holder to purchase from the Company one share of Common Stock at a
Purchase Price of $80 per share, subject to adjustment. The description and
terms of the Rights are set forth in a Rights Agreement (the "Rights Agreement")
between the Company and BankBoston, N.A. as Rights Agent.

     Initially, the Rights will be attached to all Common Stock certificates
representing shares then outstanding, and no separate Rights Certificates will
be distributed.  Subject to certain exceptions specified in the Rights
Agreement, the Rights will separate from the Common Stock and a Distribution
Date will occur upon the earlier of (i) 10 business days following a public
announcement that a person or group of affiliated or associated persons (an
"Acquiring Person") has acquired, or obtained the right to acquire, beneficial
ownership of 15% or more of the outstanding shares of Common Stock (the "Stock
Acquisition Date"), other than as a result of repurchases of stock by the
Company or certain inadvertent actions by institutional or certain other
shareholders, (ii) 10 business days (or such later date as the Board shall
determine) following the commencement of a tender offer or exchange offer that
would result in a person or group becoming an Acquiring Person or (iii) 10
business days after the Board of Directors of the Company shall declare any
Person to be an Adverse Person, upon a determination that such person, alone, or
together with its affiliates and associates, has become the beneficial owner of
an amount of Common Stock which the Board of Directors determines to be
substantial (which amount shall in no event be less than 


                                       2
<PAGE>
 
10% of the shares of Common Stock then outstanding) and a determination by at
least a majority of the Board of Directors who are not officers of the Company,
after reasonable inquiry and investigation, including consultation with such
persons as such directors shall deem appropriate, that (a) such beneficial
ownership by such person is intended to cause the Company to repurchase the
Common Stock beneficially owned by such person or to cause pressure on the
Company to take action or enter into a transaction or series of transactions
intended to provide such person with short-term financial gain under
circumstances where the Board of Directors determines that the best long-term
interests of the Company and its shareholders would not be served by taking such
action or entering into such transactions or series of transactions at that time
or (b) such beneficial ownership is causing or reasonably likely to cause a
material adverse impact (including, but not limited to, causing, or reasonably
likely to cause, the Company to be a subsidiary of a registered holding company
under the Public Utility Holding Company Act of 1935, as amended) on the
business or prospects of the Company.

     Until the Distribution Date, (i) the Rights will be evidenced by the Common
Stock certificates and will be transferred with and only with such Common Stock
certificates, (ii) new Common Stock certificates issued after the Record Date
will contain a notation incorporating the Rights Agreement by reference and
(iii) the surrender for transfer of any certificates for Common Stock
outstanding will also constitute the transfer of the Rights associated with the
Common Stock represented by such certificates. Pursuant to the Rights Agreement,
the Company reserves the right to require prior to the occurrence of a
Triggering Event (as defined below) that, upon any exercise of Rights, a number
of Rights be exercised so that only whole shares of Common Stock will be issued.


                                       3
<PAGE>
 
     The Rights are not exercisable until the Distribution Date and will expire
at 5:00 P.M., Boston, Massachusetts time on May 10, 2008, unless extended prior
thereto by the Board of Directors or earlier if redeemed by the Company as
described below.

     As soon as practicable after the Distribution Date, Rights Certificates
will be mailed to holders of record of the Common Stock as of the close of
business on the Distribution Date and, thereafter, the separate Rights
Certificates alone will represent the Rights.  Except as otherwise determined by
the Board of Directors, only shares of Common Stock issued prior to the
Distribution Date will be issued with Rights.

     In the event that the Board of Directors determines that a person is an
Adverse Person or a Person becomes an Acquiring Person (except pursuant to an
offer for all outstanding shares of Common Stock which the independent
directors, who are not associated with an Acquiring Person, determine to be fair
to shareholders and otherwise in the best interests of the Company and its
shareholders (a "Qualified Offer")), each holder of a Right will thereafter have
the right to receive, upon exercise, Common Stock (or, in certain circumstances,
cash, property or other securities of the Company) having a value equal to two
times the exercise price of the Right. Notwithstanding any of the foregoing,
following the occurrence of the events set forth in this paragraph, all Rights
that are, or (under certain circumstances specified in the Rights Agreement)
were, beneficially owned by any Acquiring Person or Adverse Person will be null
and void. 

     For example, at an exercise price of $80 per Right, each Right not owned by
an Acquiring Person or Adverse Person (or by certain related parties) following
an event set forth in the 


                                       4
<PAGE>
 
preceding paragraph would entitle its holder to purchase $160 worth of Common
Stock (or other consideration, as noted above) for $80. Assuming that the Common
Stock had a per share value of $40 at such time, the holder of each valid Right
would be entitled to purchase 4 shares of Common Stock for $80.

     In the event that, at any time following the Stock Acquisition Date, (i)
the Company engages in a merger or other business combination transaction in
which the Company is not the surviving corporation (other than with an entity
which acquired the shares pursuant to a Qualified Offer), (ii) the Company
engages in a merger or other business combination transaction in which the
Company is the surviving corporation and the Common Stock of the Company is
changed or exchanged or (iii) 50% or more of the Company's assets, cash flow or
earning power is sold or transferred, each holder of a Right (except Rights
which previously have been voided as set forth above) shall thereafter have the
right to receive, upon exercise, common stock of the acquiring company having a
value equal to two times the exercise price of the Right. The events set forth
in this paragraph and in the second preceding paragraph are referred to as the
"Triggering Events."

     The Purchase Price payable, and the number of shares of Common Stock or
other securities or property issuable, upon exercise of the Rights are subject
to adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Common
Stock, (ii) if holders of the Common Stock are granted certain rights or
warrants to subscribe for Common Stock or convertible securities at less than
the current market price of the Common Stock or (iii) upon the distribution to
holders of the Common Stock of evidence of indebtedness or assets (excluding
regular quarterly cash dividends) or of subscription rights or warrants (other
than those referred to above).


                                       5
<PAGE>
 
     With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments amount to at least 1% of the Purchase
Price.  No fractional shares will be issued and, in lieu thereof, an adjustment
in cash will be made based on the market price of the Common Stock on the last
trading date prior to the date of exercise.

     In general, at any time until ten business days following the Stock
Acquisition Date, the Company may redeem the Rights in whole, but not in part,
at a price of $.01 per Right (payable in cash, Common Stock or other
consideration deemed appropriate by the Board of Directors).  Under certain
circumstances set forth in the Rights Agreement, the decision to redeem shall
require the concurrence of a majority of the Continuing Directors.  Immediately
upon the action of the Board of Directors ordering redemption of the Rights,
with, where required, the concurrence of the Continuing Directors, the Rights
will terminate and the only right of the holders of Rights will be to receive
the $.01 redemption price.  The foregoing notwithstanding, the Rights generally
may not be redeemed for one hundred eighty (180) days following a change in a
majority of the Board of Directors as a result of a proxy contest.

     The term "Continuing Directors" means any member of the Board of Directors
of the Company who was a member of the Board prior to the date of the Rights
Agreement, and any person who is subsequently elected to the Board if such
person is recommended or approved by a majority of the Continuing Directors, but
shall not include an Acquiring Person, or an affiliate or associate of an
Acquiring Person, or any representative of the foregoing entities.

     Until a Right is exercised, the holder thereof, as such, will have no
rights as a shareholder of the Company, including, without limitation, the right
to vote or to receive dividends.  While the distribution of the Rights will not
be taxable to shareholders or to the Company, shareholders may, 


                                       6
<PAGE>
 
depending upon the circumstances, recognize taxable income in the event that the
Rights become exercisable for Common Stock (or other consideration) of the
Company or for common stock of the acquiring company or in the event of the
redemption of the Rights as set forth above.

     Prior to the Distribution Date, any of the provisions of the Rights
Agreement may be amended by the Board of Directors of the Company. After the
Distribution Date, the provisions of the Rights Agreement may be amended by the
Board (in certain circumstances, with the concurrence of the Continuing
Directors) in order to cure any ambiguity, to correct or supplement any
defective or inconsistent provision, to make changes which do not adversely
affect the interests of holders of Rights (excluding the interests of any
Acquiring Person, Adverse Person, or Affiliate or Associate of any such Person),
or to shorten or lengthen any time period under the Rights Agreement; provided,
however, that no amendment may be made at such time as the Rights are not
redeemable.

     The Rights Agreement between the Company and the Rights Agent, which
includes as an exhibit a form of Rights Certificate and a Summary of Rights to
Purchase Common Stock, is attached hereto as an exhibit and is incorporated
herein by reference. This foregoing description of the Rights does not purport
to be complete and is qualified in its entirety by reference to the Rights
Agreement.

Item 7.  Financial Statements and Exhibits.

     4.1    Rights Agreement dated as of November 12, 1997 between the Company
            and BankBoston, N.A. as Rights Agent.

    99.1    Press Release dated November 12, 1997.


                                       7
<PAGE>
 
                                   SIGNATURE

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



                                        ATMOS ENERGY CORPORATION
                                             (Registrant)



DATE:  November 13, 1997                     By: /s/ Glen A. Blanscet
                                                --------------------------------
                                                Glen A. Blanscet
                                                Vice President,
                                                General Counsel and
                                                Corporate Secretary

 

                                       8

<PAGE>
 
                                                                     EXHIBIT 4.1




                           ATMOS ENERGY CORPORATION

                                      AND

                               BANKBOSTON, N.A.

                                 RIGHTS AGENT



                            _______________________



                               RIGHTS AGREEMENT

                         DATED AS OF NOVEMBER 12, 1997

<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------



  1        Certain Definitions......................     1
 
  2        Appointment of Rights Agent..............     7
 
  3        Issuance of Rights Certificates..........     8
 
  4        Form of Rights Certificates..............    10
 
  5        Countersignature and Registration........    12
 
  6        Transfer, Split Up, Combination and
           Exchange of Rights Certificates;
           Mutilated, Destroyed, Lost or Stolen
           Rights Certificates......................    13
 
  7        Exercise of Rights; Purchase Price;
           Expiration Date of Rights................    14
 
  8        Cancellation and Destruction of Rights
           Certificates.............................    17
 
  9        Reservation and Availability of Capital
           Stock....................................    17
 
  10       Common Stock Record Date.................    19
 
  11       Adjustment of Purchase Price, Number
           and Kind of Shares or Number of
           Rights...................................    20
 
  12       Certificate of Adjusted Purchase Price
           or Number of Shares......................    33
 
  13       Consolidation, Merger or Sale or Transfer
           of Assets, Cash Flow or Earning Power....    34
 
  14       Fractional Rights and Fractional Shares..    38
 
  15       Rights of Action.........................    39
 
  16       Agreement of Rights Holders..............    40
 
  17       Rights Certificate Holder Not Deemed a
           Shareholder..............................    41
 
  18       Concerning the Rights Agent..............    41
 

                                     (ii)
<PAGE>
 
Section                                               Page
- - ---------                                             ----
 
  19       Merger or Consolidation or Change of
           Name of Rights Agent.....................    42
 
  20       Duties of Rights Agent...................    43  
 
  21       Change of Rights Agent...................    45
 
  22       Issuance of New Rights Certificates......    47
 
  23       Redemption and Termination...............    48
 
  24       Notice of Certain Events.................    50
 
  25       Notices..................................    51
 
  26       Supplements and Amendments...............    52
 
  27       Successors...............................    53
 
  28       Determinations and Actions by the Board
           of Directors, etc........................    53
 
  29       Benefits of this Agreement...............    54
 
  30       Severability.............................    54
 
  31       Governing Law............................    54
 
  32       Counterparts.............................    55
 
  33       Descriptive Headings.....................    55

Exhibit A -- Form of Rights Certificate

Exhibit B -- Summary of Rights to Purchase Common Stock

                                     (iii)
<PAGE>
 
                               RIGHTS AGREEMENT
                               ----------------

          RIGHTS AGREEMENT, dated as of November 12, 1997 (the "Agreement"),
between Atmos Energy Corporation, a Texas and Virginia corporation (the
"Company"), and BankBoston, N.A., a national association with its principal
place of business in Massachusetts (the "Rights Agent").

<PAGE>
 
                              W I T N E S S E T H
                              - - - - - - - - - -

          WHEREAS, on November 12, 1997 (the "Rights Dividend Declaration
Date"), the Board of Directors of the Company authorized and declared a dividend
distribution of one Right (as hereinafter defined) for each share of common
stock, no par value, of the Company (the "Common Stock") outstanding at the
close of business on May 10, 1998 (the "Record Date"), and has authorized the
issuance of one Right (as such number may hereinafter be adjusted pursuant to
the provisions of Section 11(p) hereof) for each share of Common Stock of the
Company issued between the Record Date (whether originally issued or delivered
from the Company's treasury) and the Distribution Date (as hereinafter defined),
each Right initially representing the right to purchase one share of Common
Stock, upon the terms and subject to the conditions hereinafter set forth (the
"Rights");

          NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein set forth, the parties hereby agree as follows:

          Section 1.  Certain Definitions.  For purposes of this Agreement, the
                      -------------------                                      
following terms have the meanings indicated:

          (a) "Acquiring Person" shall mean any Person who or which, together
with all Affiliates and Associates of such Person, shall be the Beneficial Owner
of 15% or more of the shares of Common Stock then outstanding, but shall not
include (i) the Company, (ii) any Subsidiary of the Company, (iii) any employee
benefit plan of the Company, or of any Subsidiary of the Company, or any Person
or entity organized, appointed or established by the Company for or pursuant to
the terms of any such plan, (iv) any Person who becomes the Beneficial Owner of
15% or more of the shares of Common Stock then outstanding as a result of a
reduction in the number of shares of Common Stock outstanding due to the
repurchase of shares of Common Stock by the Company unless and until such
Person, after becoming aware that such Person has become the Beneficial Owner of
15% or more of the then outstanding shares of Common Stock, acquires beneficial
ownership of additional shares of Common Stock representing 1% or more of the
shares of Common Stock then outstanding, or (v) any such Person who has reported
or is required to report such ownership (but less than 20%) on Schedule 13G
under the Securities and Exchange Act of 1934, as amended and in effect on the
date of the Agreement (the "Exchange Act") (or any comparable or successor
report) or on Schedule


                                       1
<PAGE>
 
13D under the Exchange Act (or any comparable or successor report) which
Schedule 13D does not state any intention to or reserve the right to control or
influence the management or policies of the Company or engage in any of the
actions specified in Item 4 of such schedule (other than the disposition of the
Common Stock) and, within 10 Business Days of being requested by the Company to
advise it regarding the same, certifies to the Company that such Person acquired
shares of Common Stock in excess of 14.9% inadvertently or without knowledge of
the terms of the Rights and who, together with all Affiliates and Associates,
thereafter does not acquire additional shares of Common Stock while the
Beneficial Owner of 15% or more of the shares of Common Stock then outstanding;
provided, however, that if the Person requested to so certify fails to do so
- - --------  -------
within 10 Business Days, then such Person shall become an Acquiring Person
immediately after such 10-Business-Day period.

          (b) "Act" shall mean the Securities Act of 1933.

          (c) "Adverse Person" shall mean any Person declared to be an Adverse
Person by the Board of Directors upon determination that the criteria set forth
in Section 11(a)(ii)(B) apply to such Person.

          (d) "Affiliate" and "Associate" shall have the respective meanings
ascribed to such terms in Rule 12b-2 of the General Rules and Regulations under
the Exchange Act.

          (e) "Articles of Incorporation" shall mean the Company's Restated
Articles of Incorporation, as Amended.

          (f) A Person shall be deemed the "Beneficial Owner" of, and shall be
deemed to "beneficially own," any securities:

               (i) which such Person or any of such Person's Affiliates or
     Associates, directly or indirectly, has the right to acquire (whether such
     right is exercisable immediately or only after the passage of time)
     pursuant to any agreement, arrangement or understanding (whether or not in
     writing) or upon the exercise of conversion rights, exchange rights,
     rights, warrants or options, or otherwise; provided, however, that a Person
                                                --------  -------               
     shall not be deemed the "Beneficial Owner" of, or to "beneficially own,"
     (A) securities tendered pursuant to a tender or exchange offer made by such
     Person or any of such Person's Affiliates or Associates until such tendered
     securities are accepted for purchase or exchange, or (B)

                                       2
<PAGE>
 
     securities issuable upon exercise of Rights at any time prior to the
     occurrence of a Triggering Event (as hereinafter defined), or (C)
     securities issuable upon exercise of Rights from and after the occurrence
     of a Triggering Event which Rights were acquired by such Person or any of
     such Person's Affiliates or Associates prior to the Distribution Date (as
     hereinafter defined) or pursuant to Section 3(a) or Section 22 hereof (the
     "Original Rights") or pursuant to Section 11(i) hereof in connection with
     an adjustment made with respect to any Original Rights;

               (ii) which such Person or any of such Person's Affiliates or
     Associates, directly or indirectly, has the right to vote or dispose of or
     has "beneficial ownership" of (as determined pursuant to Rule 13d-3 of the
     General Rules and Regulations under the Exchange Act), including pursuant
     to any agreement, arrangement or understanding, whether or not in writing;
     provided, however, that a Person shall not be deemed the "Beneficial Owner"
     --------  -------                                                          
     of, or to "beneficially own," any security under this subparagraph (ii) as
     a result of an agreement, arrangement or understanding to vote such
     security if such agreement, arrangement or understanding:  (A) arises
     solely from a revocable proxy given in response to a public proxy or
     consent solicitation made pursuant to, and in accordance with, the
     applicable provisions of the General Rules and Regulations under the
     Exchange Act, and (B) is not reportable by such Person on Schedule 13D
     under the Exchange Act (or any comparable or successor report); or

               (iii) which are beneficially owned, directly or indirectly, by
     any other Person (or any Affiliate or Associate thereof) with which such
     Person (or any of such Person's Affiliates or Associates) has any
     agreement, arrangement or understanding (whether or not in writing), for
     the purpose of acquiring, holding, voting (except pursuant to a revocable
     proxy as described in the proviso to subparagraph (ii) of this paragraph
     (f)) or disposing of any voting securities of the Company; provided,
                                                                -------- 
     however, that nothing in this paragraph (f) shall cause a Person engaged in
     -------                                                                    
     business as an underwriter of securities to be the "Beneficial Owner" of,
     or to "beneficially own," any securities acquired through such Person's
     participation in good faith in a firm commitment underwriting until the
     expiration of forty days after the date of such acquisition, and then only
     if such securities continue to be owned by such Person at such expiration
     of forty

                                       3
<PAGE>
 
     days and provided further, however, that any shareholder of the Company
              -------- -------  -------  
     with affiliate(s), associate(s) or other person(s) who may be deemed
     representatives of the Company who are serving as director(s) of the
     Company, shall not be deemed to beneficially own securities held by other
     Persons as a result of (i) persons affiliated or otherwise associated with
     such shareholder who are serving as directors or taking any action in
     connection therewith, (ii) discussing the status of its shares with the
     Company or other shareholders of the Company similarly situated or (iii)
     voting or acting in a manner similar to other shareholders similarly
     situated, absent a specific finding by the Board of Directors of an express
     agreement among such shareholders to act in concert with one another as
     shareholders so as to cause, in the good faith judgment of the Board of
     Directors, each such shareholder to be the Beneficial Owner of the shares
     held by the other shareholder(s).

          (g) "Business Day" shall mean any day other than a Saturday, Sunday or
a day on which banking institutions in the Commonwealth of Massachusetts are
authorized or obligated by law or executive order to close.

          (h) "Close of Business" on any given date shall mean 5:00 P.M.,
Boston, Massachusetts time, on such date; provided, however, that if such date
                                          --------  -------                   
is not a Business Day it shall mean 5:00 P.M., Boston, Massachusetts time, on
the next succeeding Business Day.

          (i) "Common Stock" shall mean the common stock, no par value, of the
Company, except that "Common Stock" when used with reference to any Person other
than the Company shall mean the capital stock of such Person with the greatest
voting power, or the equity securities or other equity interest having power to
control or direct the management, of such Person.

          (j) "Common Stock Equivalents" shall have the meaning set forth in
Section 11(a)(iii) hereof.

          (k) "Continuing Director" shall mean (i) any member of the Board of
Directors of the Company, while such Person is a member of the Board, who is not
an Acquiring Person, or an Affiliate or Associate of an Acquiring Person, or a
representative of an Acquiring Person or of any such Affiliate or Associate, and
was a member of the Board prior to the date of this Agreement, or (ii) any
Person who subsequently becomes a member of the Board, while such Person is a
member of the Board, who is not an Acquiring

                                       4
<PAGE>
 
Person, or an Affiliate or Associate of an Acquiring Person, or a representative
of an Acquiring Person or of any such Affiliate or Associate, if such Person's
nomination for election or election to the Board is recommended or approved by a
majority of the Continuing Directors.

               (l) "Current Market Price" shall have the meaning set forth in
Section 11(d) hereof.

               (m) "Current Value" shall have the meaning set forth in Section
11(a)(iii) hereof.

               (n) "Distribution Date" shall have the meaning set forth in
Section 3(a) hereof.

               (o) "Equivalent Common Stock" shall have the meaning set forth in
Section 11(b) hereof.

               (p) "Exchange Act" shall have the meaning set forth in Section
1(a) hereof.

               (q) "Expiration Date" shall have the meaning set forth in Section
7(a) hereof.

               (r) "Final Expiration Date" shall have the meaning set forth in
Section 7(a) hereof.

               (s) "Person" shall mean any individual, firm, corporation,
partnership or other entity.

               (t) "Principal Party" shall have the meaning set forth in Section
13(b) hereof.

               (u) "Purchase Price" shall have the meaning set forth in Section
4(a) hereof.

               (v) "Qualified Offer" shall have the meaning set forth in Section
11(a)(ii) hereof.

               (w) "Record Date" shall have the meaning set forth in the WHEREAS
clause at the beginning of this Agreement.

               (x) "Rights" shall have the meaning set forth in the WHEREAS
clause at the beginning of this Agreement.

               (y) "Rights Agent" shall have the meaning set forth in the
parties clause at the beginning of this Agreement.

                                       5
<PAGE>
 
               (z) "Rights Certificates" shall have the meaning set forth in
Section 3(a) hereof.

                  (aa) "Rights Dividend Declaration Date" shall have the meaning
set forth in the WHEREAS clause at the beginning of this Agreement.

                  (bb) "Section 11(a)(ii) Event" shall mean any event described
in Section 11(a)(ii) hereof.

                  (cc) "Section 13 Event" shall mean any event described in
clauses (x), (y) or (z) of Section 13(a) hereof.

                  (dd) "Spread" shall have the meaning set forth in Section
11(a)(iii) hereof.

                  (ee) "Stock Acquisition Date" shall mean the first date of
public announcement (which, for purposes of this definition, shall include,
without limitation, a report filed or amended pursuant to Section 13(d) under
the Exchange Act) by the Company or an Acquiring Person that an Acquiring Person
has become such other than pursuant to a Qualified Offer.

                  (ff) "Subsidiary" shall mean, with reference to any Person,
any corporation of which an amount of voting securities sufficient to elect at
least a majority of the directors of such corporation is beneficially owned,
directly or indirectly, by such Person, or otherwise controlled by such Person.

                  (gg) "Substitution Period" shall have the meaning set forth in
Section 11(a)(iii) hereof.

                  (hh) "Summary of Rights" shall have the meaning set forth in
Section 3(b) hereof.

                  (ii) "Trading Day" shall have the meaning set forth in Section
11(d) hereof.

                  (jj) "Triggering Event" shall mean any Section 11(a)(ii) Event
or any Section 13 Event.

          Section 2.  Appointment of Rights Agent.  The Company hereby appoints
                      ---------------------------                              
the Rights Agent to act as agent for the Company and the holders of the Rights
(who, in accordance with Section 3 hereof, shall prior to the Distribution Date
also be the holders of the Common Stock) in accordance with the terms and
conditions here-of, and the Rights Agent hereby accepts such appointment. The
Company

                                       6
<PAGE>
 
may from time to time appoint such co-rights agents as it may deem necessary or
desirable, upon ten days' prior written notice to the Rights Agent. The Rights
Agent shall have no duty to supervise, and in no event be liable for, the acts
or omissions of any such co-rights agents.

          Section 3.  Issuance of Rights Certificates.
                      ------------------------------- 

                (a) Until the earlier of (i) the Close of Business on the tenth
Business Day after the Stock Acquisition Date, (ii) the Close of Business on the
tenth Business Day (or such later date as the Board shall determine) after the
date that a tender or exchange offer by any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan of the Company or of any
Subsidiary of the Company, or any Person or entity organized, appointed or
established by the Company for or pursuant to the terms of any such plan) is
first published or sent or given within the meaning of Rule 14d-2(a) of the
General Rules and Regulations under the Exchange Act, if upon consummation
thereof, such Person would become an Acquiring Person or (iii) the Close of
Business on the tenth Business Day after the Board of Directors of the Company
determines pursuant to the criteria set forth in Section 11(a)(ii) hereof, that
a Person is an Adverse Person (the earlier of (i), (ii) and (iii) being herein
referred to as the "Distribution Date"), (x) the Rights will be evidenced
(subject to the provisions of paragraph (b) of this Section 3) by the
certificates for the Common Stock registered in the names of the holders of the
Common Stock (which certificates for Common Stock shall be deemed also to be
certificates for Rights) and not by separate certificates, and (y) the Rights
will be transferable only in connection with the transfer of the underlying
shares of Common Stock (including a transfer to the Company). As soon as
practicable after the Distribution Date, the Rights Agent will send by first-
class, insured, postage-prepaid mail, to each record holder of the Common Stock
as of the Close of Business on the Distribution Date, at the address of such
holder shown on the records of the Company, one or more rights certificates, in
substantially the form of Exhibit A hereto (the "Rights Certificates"),
evidencing one Right for each share of Common Stock so held, subject to
adjustment as provided herein. In the event that an adjustment in the number of
Rights per share of Common Stock has been made pursuant to Section 11(p) hereof,
at the time of distribution of the Rights Certificates, the Company shall make
the necessary and appropriate rounding adjustments (in accordance with Section
14(a) hereof) so that Rights Certificates representing only whole numbers of
Rights are distributed and cash is paid in lieu of any fractional Rights. As of
and after the Distribution Date, the Rights will be evidenced solely by such
Rights Certificates.

                                       7
<PAGE>
 
          (b) The Company will make available, as promptly as practicable
following the Record Date, a copy of a Summary of Rights, in substantially the
form attached hereto as Exhibit B (the "Summary of Rights"), to any holder of
Rights who may so request from time to time prior to the Expiration Date.  With
respect to certificates for the Common Stock outstanding as of the Record Date,
until the Distribution Date shall occur, the Rights will be evidenced by such
certificates for the Common Stock and the registered holders of the Common Stock
shall also be the registered holders of the associated Rights.  Until the
earlier of the Distribution Date or the Expiration Date (as such term is defined
in Section 7(a) hereof), the transfer of any certificates representing shares of
Common Stock in respect of which Rights have been issued shall also constitute
the transfer of the Rights associated with such shares of Common Stock.

          (c) Rights shall be issued in respect of all shares of Common Stock
which are issued (whether originally issued or from the Company's treasury)
after the Record Date but prior to the earlier of the Distribution Date or the
Expiration Date.  Certificates representing such shares of Common Stock shall
also be deemed to be certificates for Rights, and shall bear the following
legend if such certificates are issued after the Record Date but prior to the
earlier of the Distribution Date or the Expiration Date:

          This certificate also evidences and entitles the holder hereof to
          certain Rights as set forth in the Rights Agreement between Atmos
          Energy Corporation (the "Company") and BankBoston, N.A. (the "Rights
          Agent") dated as of November 12, 1997 (the "Rights Agreement"), the
          terms of which are hereby incorporated herein by reference and a copy
          of which is on file at the principal offices of the Rights Agent.
          Under certain circumstances, as set forth in the Rights Agreement,
          such Rights will be evidenced by separate certificates and will no
          longer be evidenced by this certificate.  The Company will mail to the
          holder of this certificate a copy of the Rights Agreement, as in
          effect on the date of mailing, without charge, promptly after receipt
          of a written request therefor.  Under certain circumstances set forth
          in the Rights Agreement, Rights issued to, or held by, any Person who
          is, was or becomes an Acquiring Person, an Adverse Person or any
          Affiliate or

                                       8
<PAGE>
 
          Associate thereof (as such terms are defined in the Rights Agreement),
          whether currently held by or on behalf of such Person or by any
          subsequent holder, may become null and void.

With respect to such certificates containing the foregoing legend, until the
earlier of (i) the Distribution Date or (ii) the Expiration Date, the Rights
associated with the Common Stock represented by such certificates shall be
evidenced by such certificates alone and registered holders of Common Stock
shall also be the registered holders of the associated Rights, and the transfer
of any of such certificates shall also constitute the transfer of the Rights
associated with the Common Stock represented by such certificates.

          Section 4.  Form of Rights Certificates.
                      --------------------------- 

          (a) The Rights Certificates (and the forms of election to purchase and
of assignment to be printed on the reverse thereof) shall each be substantially
in the form set forth in Exhibit A hereto and may have such marks of
identification or designation and such legends, summaries or endorsements
printed thereon as the Company may deem appropriate and as are not inconsistent
with the provisions of this Agreement, or as may be required to comply with any
applicable law or with any rule or regulation made pursuant thereto or with any
rule or regulation of any stock exchange on which the Rights may from time to
time be listed, or to conform to usage.  Subject to the provisions of Section 11
and Section 22 hereof, the Rights Certificates, whenever distributed, shall be
dated as of the Record Date and on their face shall entitle the holders thereof
to purchase such number of shares of Common Stock as shall be set forth therein
at the price set forth therein (such exercise price per one share, the "Purchase
Price"), but the amount and type of securities purchasable upon the exercise of
each Right and the Purchase Price thereof shall be subject to adjustment as
provided herein.

          (b) Any Rights Certificate issued pursuant to Section 3(a), Section
11(i) or Section 22 hereof that represents Rights beneficially owned by: (i) an
Acquiring Person, an Adverse Person or any Associate or Affiliate of an
Acquiring Person or an Adverse Person, (ii) a transferee of an Acquiring Person
or an Adverse Person (or of any such Associate or Affiliate) who becomes a
transferee after the Acquiring Person or Adverse Person becomes such, or (iii) a
transferee of an Acquiring Person or an Adverse Person (or of any such Associate
or Affiliate) who becomes a transferee prior to or concurrently with the
Acquiring Person or

                                       9
<PAGE>
 
Adverse Person becoming such and receives such Rights pursuant to either (A) a
transfer (whether or not for consideration) from the Acquiring Person or Adverse
Person to holders of equity interests in such Acquiring Person or Adverse Person
or to any Person with whom such Acquiring Person or Adverse Person has any
continuing agreement, arrangement or understanding regarding the transferred
Rights or (B) a transfer which the Board of Directors of the Company has
determined is part of a plan, arrangement or understanding which has as a
primary purpose or effect avoidance of Section 7(e) hereof, and any Rights
Certificate issued pursuant to Section 6 or Section 11 hereof upon transfer,
exchange, replacement or adjustment of any other Rights Certificate referred to
in this sentence, shall contain (to the extent feasible) the following legend:

          The Rights represented by this Rights Certificate are or were
          beneficially owned by a Person who was or became an Acquiring Person
          or Adverse Person or an Affiliate or Associate of an Acquiring Person
          or Adverse Person (as such terms are defined in the Rights Agreement).
          Accordingly, this Rights Certificate and the Rights represented hereby
          may become null and void in the circumstances specified in Section
          7(e) of the Rights Agreement.

          Section 5.  Countersignature and Registration.
                      --------------------------------- 

          (a) The Rights Certificates shall be executed on behalf of the Company
by its Chairman of the Board, its President or any Vice President, either
manually or by facsimile signature, and shall have affixed thereto the Company's
seal or a facsimile thereof which shall be attested by the Secretary or an
Assistant Secretary of the Company, either manually or by facsimile signature.
The Rights Certificates shall be countersigned by the Rights Agent, either
manually or by facsimile signature, and shall not be valid for any purpose
unless so countersigned.  In case any officer of the Company who shall have
signed any of the Rights Certificates shall cease to be such officer of the
Company before countersignature by the Rights Agent and issuance and delivery by
the Company, such Rights Certificates, nevertheless, may be countersigned by the
Rights Agent and issued and delivered by the Company with the same force and
effect as though the person who signed such Rights Certificates had not ceased
to be such officer of the Company; and any Rights Certificates may be signed on
behalf of the Company by any person who, at the actual date of the execution of
such Rights Certificate, shall be a proper officer of the Company to sign such
Rights Certificate, although at the date of the execution of this Rights
Agreement any such person was not such an officer.

                                       10
<PAGE>
 
          (b) Following the Distribution Date, the Rights Agent will keep, or
cause to be kept, at its principal office or offices designated as the
appropriate place for surrender of Rights Certificates upon exercise or
transfer, books for registration and transfer of the Rights Certificates issued
hereunder.  Such books shall show the names and addresses of the respective
holders of the Rights Certificates, the number of Rights evidenced on its face
by each of the Rights Certificates and the date of each of the Rights
Certificates.

          Section 6.  Transfer, Split Up, Combination and Exchange of Rights
                      ------------------------------------------------------
Certificates; Mutilated, Destroyed, Lost or Stolen Rights Certificates.
- - ---------------------------------------------------------------------- 

          (a)  Subject to the provisions of Section 4(b), Section 7(e) and
Section 14 hereof, at any time after the Close of Business on the Distribution
Date, and at or prior to the Close of Business on the Expiration Date, any
Rights Certificate or Certificates may be transferred, split up, combined or
exchanged for another Rights Certificate or Certificates, entitling the
registered holder to purchase a like number of shares of Common Stock (or other
securities, cash or other assets, as the case may be) as the Rights Certificate
or Certificates surrendered then entitles such holder (or former holder in the
case of a transfer) to purchase.  Any registered holder desiring to transfer,
split up, combine or exchange any Rights Certificate or Certificates shall make
such request in writing delivered to the Rights Agent, and shall surrender the
Rights Certificate or Certificates to be transferred, split up, combined or
exchanged at the principal office or offices of the Rights Agent designated for
such purpose.  Neither the Rights Agent nor the Company shall be obligated to
take any action whatsoever with respect to the transfer of any such surrendered
Rights Certificate until the registered holder shall have completed and signed
the certificate contained in the form of assignment on the reverse side of such
Rights Certificate and shall have provided such additional evidence of the
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or
Associates thereof as the Company shall reasonably request.  Thereupon the
Rights Agent shall, subject to Section 4(b), Section 7(e) and Section 14 hereof,
countersign and deliver to the Person entitled thereto a Rights Certificate or
Rights Certificates, as the case may be, as so requested.  The Company may
require payment of a sum sufficient to cover any tax or governmental charge that
may be imposed in connection with any transfer, split up, combination or
exchange of Rights Certificates.

                                       11
<PAGE>
 
          (b) Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a Rights Certificate, and, in case of loss, theft or destruction, of indemnity
or security reasonably satisfactory to them, and reimbursement to the Company
and the Rights Agent of all reasonable expenses incidental thereto, and upon
surrender to the Rights Agent and cancellation of the Rights Certificate if
mutilated, the Company will execute and deliver a new Rights Certificate of like
tenor to the Rights Agent for countersignature and delivery to the registered
owner in lieu of the Rights Certificate so lost, stolen, destroyed or mutilated.

          Section 7.  Exercise of Rights; Purchase Price; Expiration Date of
                      ------------------------------------------------------
Rights.
- - ------ 

          (a) Subject to Section 7(e) hereof, at any time after the Distribution
Date, the registered holder of any Rights Certificate may exercise the Rights
evidenced thereby (except as otherwise provided herein including, without
limitation, the restrictions on exercisability set forth in Section 9(c),
Section 11(a)(iii) and Section 23(a) hereof) in whole or in part upon surrender
of the Rights Certificate, with the form of election to purchase and the
certificate on the reverse side thereof duly executed, to the Rights Agent at
the principal office or offices of the Rights Agent designated for such purpose,
together with payment of the aggregate Purchase Price with respect to the total
number of shares (or other securities, cash or other assets, as the case may be)
as to which such surrendered Rights are then exercisable, at or prior to the
earlier of (i) 5:00 P.M., Boston, Massachusetts time, on May 10, 2008 or such
later date as may be established by the Board of Directors prior to the
expiration of the Rights (such date, as it may be extended by the Board, the
"Final Expiration Date"), or (ii) the time at which the Rights are redeemed as
provided in Section 23 hereof (the earlier of (i) and (ii) being herein referred
to as the "Expiration Date").

          (b) The Purchase Price for each share of Common Stock pursuant to the
exercise of a Right shall initially be $80, and shall be subject to adjustment
from time to time as provided in Section 11 and Section 13(a) hereof and shall
be payable in accordance with paragraph (c) below.

                                       12
<PAGE>
 
          (c) Upon receipt of a Rights Certificate representing exercisable
Rights, with the form of election to purchase and the certificate duly executed,
accompanied by payment, with respect to each Right so exercised, of the Purchase
Price for the Common Stock (or other shares, securities, cash or other assets,
as the case may be) to be purchased as set forth below and an amount equal to
any applicable transfer tax, the Rights Agent shall, subject to Section 20(k)
hereof, thereupon promptly (i) (A) requisition from any transfer agent of the
shares of Common Stock (or make available, if the Rights Agent is the transfer
agent for such shares) certificates for the total number of shares of Common
Stock to be purchased and the Company hereby irrevocably authorizes its transfer
agent to comply with all such requests, or (B) if the Company shall have elected
to deposit the total number of shares of Common Stock issuable upon exercise of
the Rights hereunder with a depositary agent, requisition from the depositary
agent depositary receipts representing such number of shares of Common Stock as
are to be purchased (in which case certificates for the shares of Common Stock
represented by such receipts shall be deposited by the transfer agent with the
depositary agent) and the Company will direct the depositary agent to comply
with such request, (ii) requisition from the Company the amount of cash, if any,
to be paid in lieu of fractional shares in accordance with Section 14 hereof,
(iii) after receipt of such certificates or depositary receipts, cause the same
to be delivered to or upon the order of the registered holder of such Rights
Certificate, registered in such name or names as may be designated by such
holder, and (iv) after receipt thereof, deliver such cash, if any, to or upon
the order of the registered holder of such Rights Certificate.  The payment of
the Purchase Price (as such amount may be reduced pursuant to Section 11(a)(iii)
hereof) shall be made in cash or by certified bank check or bank draft payable
to the order of the Company.  In the event that the Company is obligated to
issue other securities of the Company, pay cash and/or distribute other property
pursuant to Section 11(a) hereof, the Company will make all arrangements
necessary so that such other securities, cash and/or other property are
available for distribution by the Rights Agent, if and when appropriate.  The
Company reserves the right to require prior to the occurrence of a Triggering
Event that, upon any exercise of Rights, a number of Rights be exercised so that
only whole shares of Common Stock would be issued.

          (d) In case the registered holder of any Rights Certificate shall
exercise less than all the Rights evidenced thereby, a new Rights Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the Rights Agent and delivered to, or upon the

                                       13
<PAGE>
 
order of, the registered holder of such Rights Certificate, registered in such
name or names as may be designated by such holder, subject to the provisions of
Section 14 hereof.

          (e) Notwithstanding anything in this Agreement to the contrary, from
and after the first occurrence of a Section 11(a)(ii) Event, any Rights
beneficially owned by (i) an Acquiring Person, an Adverse Person or an Associate
or Affiliate of an Acquiring Person or an Adverse Person, (ii) a transferee of
an Acquiring Person or an Adverse Person (or of any such Associate or Affiliate)
who becomes a transferee after the Acquiring Person or Adverse Person becomes
such, or (iii) a transferee of an Acquiring Person or an Adverse Person (or of
any such Associate or Affiliate) who becomes a transferee prior to or
concurrently with the Acquiring Person or Adverse Person becoming such and
receives such Rights pursuant to either (A) a transfer (whether or not for
consideration) from the Acquiring Person or Adverse Person to holders of equity
interests in such Acquiring Person or Adverse Person or to any Person with whom
the Acquiring Person or Adverse Person has any continuing agreement, arrangement
or  understanding regarding the transferred Rights or (B) a transfer which a
majority of the Continuing Directors of the Company has determined is part of a
plan, arrangement or understanding which has as a primary purpose or effect the
avoidance of this Section 7(e), shall become null and void without any further
action and no holder of such Rights shall have any rights whatsoever with
respect to such Rights, whether under any provision of this Agreement or
otherwise.  The Company shall use all reasonable efforts to insure that the
provisions of this Section 7(e) and Section 4(b) hereof are complied with, but
shall have no liability to any holder of Rights Certificates or any other Person
as a result of its failure to make any determinations with respect to an
Acquiring Person or Adverse Person or any of their respective Affiliates,
Associates or transferees hereunder.

          (f) Notwithstanding anything in this Agreement to the contrary,
neither the Rights Agent nor the Company shall be obligated to undertake any
action with respect to a registered holder upon the occurrence of any purported
exercise as set forth in this Section 7 unless such registered holder shall have
(i) completed and signed the certificate contained in the form of election to
purchase set forth on the reverse side of the Rights Certificate surrendered for
such exercise, and (ii) provided such additional evidence of the identity of the
Beneficial Owner (or former Beneficial Owner) or Affiliates or Associates
thereof as the Company shall reasonably request.

                                       14
<PAGE>
 
          Section 8.  Cancellation and Destruction of Rights Certificates.  All
                      ---------------------------------------------------      
Rights Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or any of its
agents, be delivered to the Rights Agent for cancellation or in cancelled form,
or, if surrendered to the Rights Agent, shall be cancelled by it, and no Rights
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement.  The Company shall deliver to the
Rights Agent for cancellation and retirement, and the Rights Agent shall so
cancel and retire, any other Rights Certificate purchased or acquired by the
Company otherwise than upon the exercise thereof.  The Rights Agent shall
deliver all cancelled Rights Certificates to the Company, or shall, at the
written request of the Company, destroy such cancelled Rights Certificates, and
in such case shall deliver a certificate of destruction thereof to the Company.

          Section 9.  Reservation and Availability of Capital Stock.
                      --------------------------------------------- 

          (a) The Company covenants and agrees that it will cause to be reserved
and kept available out of its authorized and unissued shares of Common Stock
and/or other securities or out of its authorized and issued shares held in its
treasury, the number of shares of Common Stock and/or other securities that, as
provided in this Agreement including Section 11(a)(iii) hereof, will be
sufficient to permit the exercise in full of all outstanding Rights.

          (b) So long as the shares of Common Stock and/or other securities
issuable and deliverable upon the exercise of the Rights may be listed on any
national securities exchange, the Company shall use its best efforts to cause,
from and after such time as the Rights become exercisable, all shares reserved
for such issuance to be listed on such exchange upon official notice of issuance
upon such exercise.

          (c) The Company shall use its best efforts to (i) file, as soon as
practicable following the earliest date after the first occurrence of a Section
11(a)(ii) Event on which the consideration to be delivered by the Company upon
exercise of the Rights has been determined in accordance with Section 11(a)(iii)
hereof, a registration statement under the Act, with respect to the securities
purchasable upon exercise of the Rights on an appropriate form, (ii) cause such
registration statement to become effective as soon as practicable after such
filing, and (iii) cause such registration statement to remain effective

                                      15
<PAGE>
 
(with a prospectus at all times meeting the requirements of the Act) until the
earlier of (A) the date as of which the Rights are no longer exercisable for
such securities, and (B) the date of the expiration of the Rights. The Company
will also take such action as may be appropriate under, or to ensure compliance
with, the securities or "blue sky" laws of the various states in connection with
the exercisability of the Rights. The Company may temporarily suspend, for a
period of time not to exceed ninety (90) days after the date set forth in clause
(i) of the first sentence of this Section 9(c), the exercisability of the Rights
in order to prepare and file such registration statement and permit it to become
effective. Upon any such suspension, the Company shall issue a public
announcement stating that the exercisability of the Rights has been temporarily
suspended, as well as a public announcement at such time as the suspension has
been rescinded. In addition, if the Company shall determine that a registration
statement is required following the Distribution Date, the Company may
temporarily suspend the exercisability of the Rights until such time as a
registration statement has been declared effective. Notwithstanding any
provision of this Agreement to the contrary, the Rights shall not be exercisable
in any jurisdiction if the requisite qualification in such jurisdiction shall
not have been obtained, the exercise thereof shall not be permitted under
applicable law (including under any state utility-related or other statutes and
regulations to which the Company or any part of its business or operations is
subject), or a registration statement shall not have been declared effective.

          (d) The Company covenants and agrees that it will take all such action
as may be necessary to ensure that all shares of Common Stock and/or other
securities delivered upon exercise of Rights shall, at the time of delivery of
the certificates for such shares (subject to payment of the Purchase Price), be
duly and validly authorized and issued and fully paid and nonassessable.

          (e) The Company further covenants and agrees that it will pay when due
and payable any and all federal and state transfer taxes and charges which may
be payable in respect of the issuance or delivery of the Rights Certificates and
of any certificates for Common Stock and/or other securities, as the case may
be, upon the exercise of Rights.  The Company shall not, however, be required to
pay any transfer tax which may be payable in respect of any transfer or delivery
of Rights Certificates to a Person other than, or the issuance or delivery of
Common Stock and/or other securities, as the case may be, in respect of a name
other than that of, the registered holder of the Rights

                                       16
<PAGE>
 
Certificates evidencing Rights surrendered for exercise or to issue or deliver
any certificates for Common Stock and/or other securities, as the case may be,
in a name other than that of the registered holder upon the exercise of any
Rights until such tax shall have been paid (any such tax being payable by the
holder of such Rights Certificate at the time of surrender) or until it has been
established to the Company's satisfaction that no such tax is due.

          Section 10.  Common Stock Record Date.  Each person in whose name any
                       ------------------------                                
certificate for shares of Common Stock and/or other securities, as the case may
be, is issued upon the exercise of Rights shall for all purposes be deemed to
have become the holder of record of such shares of Common Stock and/or other
securities, as the case may be, represented thereby on, and such certificate
shall be dated, the date upon which the Rights Certificate evidencing such
Rights was duly surrendered and payment of the Purchase Price (and all
applicable transfer taxes) was made; provided, however, that if the date of such
                                     --------  -------                          
surrender and payment is a date upon which the Common Stock (or other
securities, as the case may be) transfer books of the Company are closed, such
Person shall be deemed to have become the record holder of such shares
(fractional or otherwise) on, and such certificate shall be dated, the next
succeeding Business Day on which the Common Stock (or other securities, as the
case may be) transfer books of the Company are open.  Prior to the exercise of
the Rights evidenced thereby, the holder of a Rights Certificate shall not be
entitled to any rights of a shareholder of the Company with respect to shares
for which the Rights shall be exercisable, including, without limitation, the
right to vote, to receive dividends or other distributions, and shall not be
entitled to receive any notice of any proceedings of the Company, except as
provided herein.

          Section 11.  Adjustment of Purchase Price, Number and Kind of Shares
                       -------------------------------------------------------
or Number of Rights.  The Purchase Price, the number and kind of shares covered
- - -------------------                                                            
by each Right and the number of Rights outstanding are subject to adjustment
from time to time as provided in this Section 11.

               (a)(i) In the event the Company shall at any time after the date
     of this Agreement (A) declare a dividend on the Common Stock payable in
     shares of Common Stock, (B) subdivide the outstanding Common Stock, (C)
     combine the out-standing Common Stock into a smaller number of shares, or
     (D) issue any shares of its capital stock in a reclassification of the
     Common Stock (including any such reclassification in connection with a
     consolidation or merger in which the

                                      17
<PAGE>
 
     Company is the continuing or surviving corporation), except as otherwise
     provided in this Section 11(a) and Section 7(e) hereof, the Purchase Price
     in effect at the time of the record date for such dividend or of the
     effective date of such subdivision, combination or reclassification, and
     the number and kind of shares of Common Stock or capital stock, as the case
     may be, issuable on such date, shall be proportionately adjusted so that
     the holder of any Right exercised after such time shall be entitled to
     receive, upon payment of the Purchase Price then in effect, the aggregate
     number and kind of shares of Common Stock, or capital stock, as the case
     may be, which, if such Right had been exercised immediately prior to such
     date and at a time when the Common Stock transfer books of the Company were
     open, such holder would have owned upon such exercise and been entitled to
     receive by virtue of such dividend, subdivision, combination or
     reclassification; provided, however, that if the record date for any such
                       --------  -------    
     dividend, subdivision, combination or reclassification shall occur prior to
     the Distribution Date, the Company shall make an appropriate adjustment to
     the Purchase Price (taking into account any additional Rights which may be
     issued as a result of such dividend, subdivision, combination or
     reclassification), in lieu of adjusting (as described above) the number of
     shares of Common Stock (or other capital shares, as the case may be)
     issuable upon exercise of the Rights. If an event occurs which would
     require an adjustment under both this Section 11(a)(i) and Section
     11(a)(ii) hereof, the adjustment provided for in this Section 11(a)(i)
     shall be in addition to, and shall be made prior to, any adjustment
     required pursuant to Section 11(a)(ii) hereof.

               (ii)  In the event (A) any Person (other than the Company, any
     Subsidiary of the Company, any employee benefit plan of the Company or of
     any Subsidiary of the Company, or any Person or entity organized, appointed
     or established by the Company for or pursuant to the terms of any such
     plan), alone or together with its Affiliates and Associates, shall, at any
     time after the Rights Dividend Declaration Date, become an Acquiring
     Person, unless the event causing the 15% threshold to be crossed is a
     transaction set forth in Section 13(a) hereof, or is an acquisition of
     shares of Common Stock pursuant to a tender offer or an exchange offer for
     all outstanding shares of Common Stock at a price and on terms determined
     by at least a majority of the members of the Board of Directors who are not
     officers of the Company and who are not

                                       18
<PAGE>
 
     representatives, nominees, Affiliates or Associates of an Acquiring Person,
     after receiving advice from one or more investment banking firms, to be (i)
     at a price which is fair to shareholders (taking into account all factors
     which such members of the Board deem relevant, including, without
     limitation, prices which could reasonably be achieved if the Company or its
     assets were sold on an orderly basis designed to realize maximum value) and
     (ii) otherwise in the best interests of the Company and its shareholders (a
     "Qualified Offer"), or (B) the Board of Directors of the Company shall
     declare any Person to be an Adverse Person, upon a determination that such
     Person, alone or together with its Affiliates and Associates, has, at any
     time after the Rights Dividend Declaration Date, become the Beneficial
     Owner of an amount of Common Stock which the Board of Directors determines
     to be substantial (which amount shall in no event be less than 10% of the
     shares of Common Stock then outstanding) and a determination by at least a
     majority of the Board of Directors who are not officers of the Company,
     after reasonable inquiry and investigation, including consultation with
     such persons as such directors shall deem appropriate, that (i) such
     Beneficial Ownership by such Persons is intended to cause the Company to
     repurchase the Common Stock beneficially owned by such Person or to cause
     pressure on the Company to take action or enter into a transaction or
     series of transactions intended to provide such Person with short-term
     financial gain under circumstances where the Board of Directors determines
     that the best long-term interests of the Company and its shareholders would
     not be served by taking such action or entering into such transactions or
     series of transactions at that time or (ii) such Beneficial Ownership is
     causing or reasonably likely to cause a material adverse impact (including,
     but not limited to, causing, or being reasonably likely to cause, the
     Company to become a subsidiary of a registered holding company under the
     Public Utility Holding Company Act of 1935, as amended) on the business or
     prospects of the Company,

then, promptly following the occurrence of such event,  proper provision shall
be made so that each holder of a Right (except as provided below and in Section
7(e) hereof) shall thereafter have the right to receive, upon exercise thereof
at the then current Purchase Price in accordance with the terms of this
Agreement, such number of shares of Common Stock of the Company as shall equal
the result obtained by (x) multiplying the then current Purchase Price by the
then number of shares of Common Stock for which a

                                       19
<PAGE>
 
Right was exercisable immediately prior to the first occurrence of a Section
11(a)(ii) Event, and (y) dividing that product (which, following such first
occurrence, shall thereafter be referred to as the "Purchase Price" for each
Right and for all purposes of this Agreement) by 50% of the Current Market Price
(determined pursuant to Section 11(d) hereof) per share of Common Stock on the
date of such first occurrence (such number of shares, the "Adjustment Shares").

               (iii) In the event that the number of shares of Common Stock
     which are authorized by the Company's Articles of Incorporation, but which
     are not outstanding or reserved for issuance for purposes other than upon
     exercise of the Rights, are not sufficient to permit the exercise in full
     of the Rights in accordance with the foregoing subparagraph (ii) of this
     Section 11(a), the Company shall: (A) determine the value of the Adjustment
     Shares issuable upon the exercise of a Right (the "Current Value"), and (B)
     with respect to each Right (subject to Section 7(e) hereof), make adequate
     provision to substitute for the Adjustment Shares, upon the exercise of a
     Right and payment of the applicable Purchase Price, (1) cash, (2) a
     reduction in the Purchase Price, (3) Common Stock or other equity
     securities of the Company (including, without limitation, shares, or units
     of shares, of preferred stock which the Board has deemed to have
     essentially the same value or economic rights as shares of Common Stock
     (such shares of preferred stock being referred to as "Common Stock
     Equivalents")), (4) debt securities of the Company, (5) other assets, or
     (6) any combination of the foregoing, having an aggregate value equal to
     the Current Value (less the amount of any reduction in the Purchase Price),
     where such aggregate value has been determined by the Board based upon the
     advice of a nationally recognized investment banking firm selected by the
     Board; provided, however, that if the Company shall not have made adequate
            --------  -------                                                  
     provision to deliver value pursuant to clause (B) above within thirty (30)
     days following the later of (x) the first occurrence of a Section 11(a)(ii)
     Event and (y) the date on which the Company's right of redemption pursuant
     to Section 23(a) expires (the later of (x) and (y) being referred to herein
     as the "Section 11(a)(ii) Trigger Date"), then the Company shall be
     obligated to deliver, upon the surrender for exercise of a Right and
     without requiring payment of the Purchase Price, shares of Common Stock (to
     the extent available) and then, if necessary, cash, which shares and/or
     cash have an aggregate value equal to the Spread.  For purposes of the
     preceding sentence, the term "Spread" shall mean the excess of (i) the

                                       20
<PAGE>
 
     Current Value over (ii) the Purchase Price.  If the Board determines in
     good faith that it is likely that sufficient additional shares of Common
     Stock could be authorized for issuance upon exercise in full of the Rights
     or required regulatory approvals so warrant, the thirty (30) day period set
     forth above may be extended to the extent necessary, but not more than one
     hundred and eighty (180) days after the Section 11(a)(ii) Trigger Date, in
     order that the Company may seek shareholder approval for the authorization
     of such additional shares (such thirty (30) day period, as it may be
     extended, is herein called the "Substitution Period").  To the extent that
     action is to be taken pursuant to the first and/or third sentences of this
     Section 11(a)(iii), the Company (1) shall provide, subject to Section 7(e)
     hereof, that such action shall apply uniformly to all outstanding Rights,
     and (2) may suspend the exercisability of the Rights until the expiration
     of the Substitution Period in order to seek required regulatory approvals
     and/or such shareholder approval for such authorization of additional
     shares and/or to decide the appropriate form of distribution to be made
     pursuant to such first sentence and to determine the value thereof.  In the
     event of any such suspension, the Company shall issue a public announcement
     stating that the exercisability of the Rights has been temporarily
     suspended, as well as a public announcement at such time as the suspension
     is no longer in effect.  For purposes of this Section 11(a)(iii), the value
     of each Adjustment Share shall be the current market price per share of the
     Common Stock on the Section 11(a)(ii) Trigger Date and the value of any
     Common Stock Equivalent shall be deemed to equal the current market price
     per share of the Common Stock on such date.

               (b) In case the Company shall fix a record date for the issuance
     of rights, options or warrants to all holders of Common Stock entitling
     them to subscribe for or purchase (for a period expiring within forty-five
     (45) calendar days after such record date) Common Stock (or shares having
     the same rights, privileges and preferences as the shares of Common Stock
     ("Equivalent Common Stock")) or securities convertible into Common Stock or
     Equivalent Common Stock at a price per share of Common Stock or per share
     of Equivalent Common Stock (or having a conversion price per share, if a
     security convertible into Common Stock or Equivalent Common Stock) less
     than the Current Market Price (as determined pursuant to Section 11(d)
     hereof) per share of Common Stock on such record date, the Purchase Price
     

                                       21
<PAGE>
 
     to be in effect after such record date shall be determined by multiplying
     the Purchase Price in effect immediately prior to such record date by a
     fraction, the numerator of which shall be the number of shares of Common
     Stock outstanding on such record date, plus the number of shares of Common
     Stock which the aggregate offering price of the total number of shares of
     Common Stock and/or Equivalent Common Stock so to be offered (and/or the
     aggregate initial conversion price of the convertible securities so to be
     offered) would purchase at such Current Market Price, and the denominator
     of which shall be the number of shares of Common Stock outstanding on such
     record date, plus the number of additional shares of Common Stock and/or
     Equivalent Common Stock to be offered for subscription or purchase (or into
     which the convertible securities so to be offered are initially
     convertible).  In case such subscription price may be paid by delivery of
     consideration, part or all of which may be in a form other than cash, the
     value of such consideration shall be as determined in good faith by the
     Board of Directors of the Company, whose determination shall be described
     in a statement filed with the Rights Agent and shall be binding on the
     Rights Agent and the holders of the Rights.  Shares of Common Stock owned
     by or held for the account of the Company shall not be deemed outstanding
     for the purpose of any such computation.  Such adjustment shall be made
     successively whenever such a record date is fixed, and in the event that
     such rights or warrants are not so issued, the Purchase Price shall be
     adjusted to be the Purchase Price which would then be in effect if such
     record date had not been fixed.

               (c) In case the Company shall fix a record date for a
     distribution to all holders of Common Stock (including any such
     distribution made in connection with a consolidation or merger in which the
     Company is the continuing corporation), cash (other than a regular
     quarterly cash dividend out of the earnings or retained earnings of the
     Company), assets (other than a dividend payable in Common Stock, but
     including any dividend payable in stock other than Common Stock) or
     evidences of indebtedness, or of subscription rights or warrants (excluding
     those referred to in Section 11(b) hereof), the Purchase Price to be in
     effect after such record date shall be determined by multiplying the
     Purchase Price in effect immediately prior to such record date by a
     fraction, the numerator of which shall be the Current Market Price (as
     determined pursuant to Section 11(d) hereof) per share of Common Stock on
     such record date,

                                       22
<PAGE>
 
     less the fair market value (as determined in good faith by the Board of
     Directors of the Company, whose determination shall be described in a
     statement filed with the Rights Agent) of the portion of the cash, assets
     or evidences of indebtedness so to be distributed or of such subscription
     rights or warrants applicable to a share of Common Stock, and the
     denominator of which shall be such Current Market Price (as determined
     pursuant to Section 11(d) hereof) per share of Common Stock. Such
     adjustments shall be made successively whenever such a record date is
     fixed, and in the event that such distribution is not so made, the Purchase
     Price shall be adjusted to be the Purchase Price which would have been in
     effect if such record date had not been fixed.

               (d) For the purpose of any computation hereunder, other than
     computations made pursuant to Section 11(a)(iii) hereof, the "Current
     Market Price" per share of Common Stock on any date shall be deemed to be
     the average of the daily closing prices per share of such Common Stock for
     the thirty (30) consecutive Trading Days immediately prior to such date,
     and for purposes of computations made pursuant to Section 11(a)(iii)
     hereof, the "Current Market Price" per share of Common Stock on any date
     shall be deemed to be the average of the daily closing prices per share of
     such Common Stock for the ten (10) consecutive Trading Days immediately
     following such date; provided, however, that in the event that the Current
                          --------  -------                                    
     Market Price per share of the Common Stock is determined during a period
     following the announcement by the issuer of such Common Stock of (A) a
     dividend or distribution on such Common Stock payable in shares of such
     Common Stock or securities convertible into shares of such Common Stock
     (other than the Rights), or (B) any subdivision, combination or
     reclassification of such Common Stock, and the ex-dividend date for such
     dividend or distribution, or the record date for such subdivision,
     combination or reclassification shall not have occurred prior to the
     commencement of the requisite thirty (30) Trading Day or ten (10) Trading
     Day period, as set forth above, then, and in each such case, the "Current
     Market Price" shall be properly adjusted to take into account ex-dividend
     trading.  The closing price for each day shall be the last sale price,
     regular way, or, in case no such sale takes place on such day, the average
     of the closing bid and asked prices, regular way, in either case as
     reported in the principal consolidated transaction reporting system with
     respect to securities listed or admitted to trading on the New York Stock
     Exchange or, if the shares of Common Stock are not listed or admitted to
     trading on the New

                                       23
<PAGE>
 
     York Stock Exchange, as reported in the principal consolidated transaction
     reporting system with respect to securities listed on the principal
     national securities exchange on which the shares of Common Stock are listed
     or admitted to trading or, if the shares of Common Stock are not listed or
     admitted to trading on any national securities exchange, the last quoted
     price or, if not so quoted, the average of the high bid and low asked
     prices in the over-the-counter market, as reported by the National
     Association of Securities Dealers, Inc. Automated Quotation System
     ("NASDAQ") or such other system then in use, or, if on any such date the
     shares of Common Stock are not quoted by any such organization, the average
     of the closing bid and asked prices as furnished by a professional market
     maker making a market in the Common Stock selected by the Board. If on any
     such date no market maker is making a market in the Common Stock, the fair
     value of such shares on such date as determined in good faith by the Board
     shall be used. The term "Trading Day" shall mean a day on which the
     principal national securities exchange on which the shares of Common Stock
     are listed or admitted to trading is open for the transaction of business
     or, if the shares of Common Stock are not listed or admitted to trading on
     any national securities exchange, a Business Day. If the Common Stock is
     not publicly held or not so listed or traded, "Current Market Price" per
     share shall mean the fair value per share as determined in good faith by
     the Board, whose determination shall be described in a statement filed with
     the Rights Agent and shall be conclusive for all purposes.

               (e) Anything herein to the contrary not-withstanding, no
     adjustment in the Purchase Price shall be required unless such adjustment
     would require an increase or decrease of at least one percent (1%) in the
     Purchase Price; provided, however, that any adjustments which by reason of
                     --------  -------                                         
     this Section 11(e) are not required to be made shall be carried forward and
     taken into account in any subsequent adjustment.  All calculations under
     this Section 11 shall be made to the nearest cent or to the nearest ten-
     thousandth of a share of Common Stock or other share, as the case may be.
     Notwithstanding the first sentence of this Section 11(e), any adjustment
     required by this Section 11 shall be made no later than the earlier of (i)
     three (3) years from the date of the transaction which mandates such
     adjustment, or (ii) the Expiration Date.

                                       24
<PAGE>
 
               (f) If as a result of an adjustment made pursuant to Section
     11(a)(ii) or Section 13(a) hereof, the holder of any Right thereafter
     exercised shall become entitled to receive any shares of capital stock
     other than Common Stock, thereafter the number of such other shares so
     receivable upon exercise of any Right and the Purchase Price thereof shall
     be subject to adjustment from time to time in a manner and on terms as
     nearly equivalent as practicable to the provisions with respect to the
     Common Stock contained in Sections 11(a), (b), (c), (e), (g), (h), (i),
     (j), (k) and (m), and the provisions of Sections 7, 9, 10, 13 and 14 hereof
     with respect to the Common Stock shall apply on like terms to any such
     other shares.

               (g) All Rights originally issued by the Company subsequent to any
     adjustment made to the Purchase Price hereunder shall evidence the right to
     purchase, at the adjusted Purchase Price, the number of shares of Common
     Stock purchasable from time to time hereunder upon exercise of the Rights,
     all subject to further adjustment as provided herein.

               (h) Unless the Company shall have exercised its election as
     provided in Section 11(i), upon each adjustment of the Purchase Price as a
     result of the calculations made in Sections 11(b) and (c), each Right
     outstanding immediately prior to the making of such adjustment shall
     thereafter evidence the right to purchase, at the adjusted Purchase Price,
     that number of shares of Common Stock (calculated to the nearest one ten-
     thousandth) obtained by (i) multiplying (x) the number of shares covered by
     a Right immediately prior to this adjustment, by (y) the Purchase Price in
     effect immediately prior to such adjustment of the Purchase Price, and (ii)
     dividing the product so obtained by the Purchase Price in effect
     immediately after such adjustment of the Purchase Price.

               (i) The Company may elect on or after the date of any adjustment
     of the Purchase Price to adjust the number of Rights, in lieu of any
     adjustment in the number of shares of Common Stock purchasable upon the
     exercise of a Right.  Each of the Rights outstanding after the adjustment
     in the number of Rights shall be exercisable for the number of shares of
     Common Stock for which a Right was exercisable immediately prior to such
     adjustment.  Each Right held of record prior to such adjustment of the
     number of Rights shall become that number of Rights (calculated to the
     nearest one

                                       25
<PAGE>
 
     ten-thousandth) obtained by dividing the Purchase Price in effect
     immediately prior to adjustment of the Purchase Price by the Purchase Price
     in effect immediately after adjustment of the Purchase Price. The Company
     shall make a public announcement of its election to adjust the number of
     Rights, indicating the record date for the adjustment, and, if known at the
     time, the amount of the adjustment to be made. This record date may be the
     date on which the Purchase Price is adjusted or any day thereafter, but, if
     the Rights Certificates have been issued, shall be at least ten (10) days
     later than the date of the public announcement. If Rights Certificates have
     been issued, upon each adjustment of the number of Rights pursuant to this
     Section 11(i), the Company shall, as promptly as practicable, cause to be
     distributed to holders of record of Rights Certificates on such record date
     Rights Certificates evidencing, subject to Section 14 hereof, the
     additional Rights to which such holders shall be entitled as a result of
     such adjustment, or, at the option of the Company, shall cause to be
     distributed to such holders of record in substitution and replacement for
     the Rights Certificates held by such holders prior to the date of
     adjustment, and upon surrender thereof, if required by the Company, new
     Rights Certificates evidencing all the Rights to which such holders shall
     be entitled after such adjustment. Rights Certificates so to be distributed
     shall be issued, executed and countersigned in the manner provided for
     herein (and may bear, at the option of the Company, the adjusted Purchase
     Price) and shall be registered in the names of the holders of record of
     Rights Certificates on the record date specified in the public
     announcement.

               (j) Irrespective of any adjustment or change in the Purchase
     Price or the number of shares of Common Stock issuable upon the exercise of
     the Rights, the Rights Certificates theretofore and thereafter issued may
     continue to express the Purchase Price per share and the number of shares
     which were expressed in the initial Rights Certificates issued hereunder.

               (k) Before taking any action that would cause an adjustment
     reducing the Purchase Price below the then stated value, if any, of the
     number of shares of Common Stock issuable upon exercise of the Rights, the
     Company shall take any corporate action which may, in the opinion of its
     counsel, be necessary in order that the Company may validly and legally
     issue fully paid and nonassessable such number of shares of Common Stock at
     such adjusted Purchase Price.

                                       26
<PAGE>
 
               (l) In any case in which this Section 11 shall require that an
     adjustment in the Purchase Price be made effective as of a record date for
     a specified event, the Company may elect to defer until the occurrence of
     such event the issuance to the holder of any Right exercised after such
     record date the number of shares of Common Stock and other capital stock or
     securities of the Company, if any, issuable upon such exercise over and
     above the number of shares of Common Stock and other capital stock or
     securities of the Company, if any, issuable upon such exercise on the basis
     of the Purchase Price in effect prior to such adjustment; provided,
                                                               -------- 
     however, that the Company shall deliver to such holder a due bill or other
     -------                                                                   
     appropriate instrument evidencing such holder's right to receive such
     additional shares (fractional or otherwise) or securities upon the
     occurrence of the event requiring such adjustment.

               (m) Anything in this Section 11 to the contrary notwithstanding,
     the Company shall be entitled to make such reductions in the Purchase
     Price, in addition to those adjustments expressly required by this Section
     11, as and to the extent that in their good faith judgment the Board of
     Directors of the Company shall determine to be advisable in order that any
     (i) consolidation or subdivision of the Common Stock, (ii) issuance wholly
     for cash of any shares of Common Stock at less than the Current Market
     Price, (iii) issuance wholly for cash of shares of Common Stock or
     securities which by their terms are convertible into or exchangeable for
     shares of Common Stock, (iv) stock dividends or (v) issuance of rights,
     options or warrants referred to in this Section 11, hereafter made by the
     Company to holders of its Common Stock shall not be taxable to such
     shareholders.

               (n) The Company covenants and agrees that it shall not, at any
     time after the Distribution Date, (i) consolidate with any other Person
     (other than a Subsidiary of the Company in a transaction which complies
     with Section 11(o) hereof), (ii) merge with or into any other Person (other
     than a Subsidiary of the Company in a transaction which complies with
     Section 11(o) hereof), or (iii) sell or transfer (or permit any Subsidiary
     to sell or transfer), in one transaction, or a series of related
     transactions, assets, cash flow or earning power aggregating more than 50%
     of the assets, cash flow or earning power of the Company and its

                                       27
<PAGE>
 
     Subsidiaries (taken as a whole) to any other Person or Persons (other than
     the Company and/or any of its Subsidiaries in one or more transactions each
     of which complies with Section 11(o) hereof), if (x) at the time of or
     immediately after such consolidation, merger or sale there are any rights,
     warrants or other instruments or securities outstanding or agreements in
     effect which would substantially diminish or otherwise eliminate the
     benefits intended to be afforded by the Rights or (y) prior to,
     simultaneously with or immediately after such  consolidation, merger or
     sale, the shareholders of the Person who constitutes, or would constitute,
     the "Principal Party" for purposes of Section 13(a) hereof shall have
     received a distribution of Rights previously owned by such Person or any of
     its Affiliates and Associates.

               (o) The Company covenants and agrees that, after the Distribution
     Date, it will not, except as permitted by Section 23 or Section 26 hereof,
     take (or permit any Subsidiary to take) any action if at the time such
     action is taken it is reasonably foreseeable that such action will diminish
     substantially or otherwise eliminate the benefits intended to be afforded
     by the Rights.

               (p) Anything in this Agreement to the contrary notwithstanding,
     in the event that the Company shall at any time after the Rights Dividend
     Declaration Date and prior to the Distribution Date (i) declare a dividend
     on the outstanding shares of Common Stock payable in shares of Common
     Stock, (ii) subdivide the outstanding shares of Common Stock, or (iii)
     combine the outstanding shares of Common Stock into a smaller number of
     shares, the number of Rights associated with each share of Common Stock
     then outstanding, or issued or delivered thereafter but prior to the
     Distribution Date, shall be proportionately adjusted so that the number of
     Rights thereafter associated with each share of Common Stock following any
     such event shall equal the result obtained by multiplying the number of
     Rights associated with each share of Common Stock immediately prior to such
     event by a fraction the numerator of which shall be the total number of
     shares of Common Stock outstanding immediately prior to the occurrence of
     the event and the denominator of which shall be the total number of shares
     of Common Stock outstanding immediately following the occurrence of such
     event.

                                      28
<PAGE>
 
          Section 12.  Certificate of Adjusted Purchase Price or Number of
                       ---------------------------------------------------
Shares.  Whenever an adjustment is made as provided in Section 11 and Section 13
- - ------                                                                          
hereof, the Company shall (a) promptly prepare a certificate setting forth such
adjustment and a brief statement of the facts accounting for such adjustment,
(b) promptly file with the Rights Agent, and with each transfer agent for the
Common Stock, a copy of such certificate, and (c) mail a brief summary thereof
to each holder of a Rights Certificate (or, if prior to the Distribution Date,
to each holder of a certificate representing shares of Common Stock) in
accordance with Section 25 hereof.  The Rights Agent shall be fully protected in
relying on any such certificate and on any adjustment therein contained.

          Section 13.  Consolidation, Merger or Sale or Transfer of Assets, Cash
                       ---------------------------------------------------------
Flow or Earning Power.
- - --------------------- 

          (a) In the event that, following the Stock Acquisition Date, directly
or indirectly, (x) the Company shall consolidate with, or merge with and into,
any other Person (other than a Subsidiary of the Company in a transaction which
complies with Section 11(o) here-of), and the Company shall not be the
continuing or surviving corporation of such consolidation or merger, (y) any
Person (other than a Subsidiary of the Company in a transaction which complies
with Section 11(o) hereof) shall consolidate with, or merge with or into, the
Company, and the Company shall be the continuing or surviving corporation of
such consolidation or merger and, in connection with such consolidation or
merger, all or part of the outstanding shares of Common Stock shall be changed
into or exchanged for stock or other securities of any other Person or cash or
any other property, or (z) the Company shall sell or otherwise transfer (or one
or more of its Subsidiaries shall sell or otherwise transfer), in one
transaction or a series of related transactions, assets, cash flow or earning
power aggregating more than 50% of the assets, cash flow or earning power of the
Company and its Subsidiaries (taken as a whole) to any Person or Persons (other
than the Company or any Subsidiary of the Company in one or more transactions
each of which complies with Section 11(o) hereof), then, and in each such case
(except as may be contemplated by Section 13(d) hereof), proper provision shall
be made so that: (i) each holder of a Right, except as provided in Section 7(e)
hereof, shall thereafter have the right to receive, upon the exercise thereof at
the then current Purchase Price in accordance with the terms of this Agreement,
such number of validly authorized and issued, fully paid, non-assessable and
freely tradeable shares of Common Stock of the Principal Party (as such term is

                                      29
<PAGE>
 
hereinafter defined), not subject to any liens, encumbrances, rights of first
refusal or other adverse claims, as shall be equal to the result obtained by (1)
multiplying the then current Purchase Price by the number of shares of Common
Stock for which a Right is exercisable immediately prior to the first occurrence
of a Section 13 Event (or, if a Section 11(a)(ii) Event has occurred prior to
the first occurrence of a Section 13 Event, multiplying the number of such
shares for which a Right was exercisable immediately prior to the first
occurrence of a Section 11(a)(ii) Event by the Purchase Price in effect
immediately prior to such first occurrence), and dividing that product (which,
following the first occurrence of a Section 13 Event, shall be referred to as
the "Purchase Price" for each Right and for all purposes of this Agreement) by
(2) 50% of the Current Market Price (determined pursuant to Section 11(d)
hereof) per share of the Common Stock of such Principal Party on the date of
consummation of such Section 13 Event; (ii) such Principal Party shall
thereafter be liable for, and shall assume, by virtue of such Section 13 Event,
all the obligations and duties of the Company pursuant to this Agreement; (iii)
the term "Company" shall thereafter be deemed to refer to such Principal Party,
it being specifically intended that the provisions of Section 11 hereof shall
apply only to such Principal Party following the first occurrence of a Section
13 Event; (iv) such Principal Party shall take such steps (including, but not
limited to, the reservation of a sufficient number of shares of its Common
Stock) in connection with the consummation of any such transaction as may be
necessary to assure that the provisions hereof shall thereafter be applicable,
as nearly as reasonably may be, in relation to its shares of Common Stock
thereafter deliverable upon the exercise of the Rights; and (v) the provisions
of Section 11(a)(ii) hereof shall be of no effect following the first occurrence
of any Section 13 Event.

               (b)  "Principal Party" shall mean:

                    (i) in the case of any transaction described in clause (x)
          or (y) of the first sentence of Section 13(a), the Person that is the
          issuer of any securities into which shares of Common Stock of the
          Company are converted in such merger or consolidation, and if no
          securities are so issued, the Person that is the other party to such
          merger or consolidation; and

                    (ii) in the case of any transaction described in clause (z)
          of the first sentence of Section 13(a), the Person that is the party
          receiving the greatest portion of the assets, cash flow or earning
          power transferred pursuant to such transaction or transactions;

                                      30
<PAGE>
 
provided, however, that in any such case, (1) if the Common Stock of such Person
- - --------  -------                                                               
is not at such time and has not been continuously over the preceding twelve (12)
month period registered under Section 12 of the Exchange Act, and such Person is
a direct or indirect Subsidiary of another Person the Common Stock of which is
and has been so registered, "Principal Party" shall refer to such other Person;
and (2) in case such Person is a Subsidiary, directly or indirectly, of more
than one Person, the Common Stocks of two or more of which are and have been so
registered, "Principal Party" shall refer to whichever of such Persons is the
issuer of the Common Stock having the greatest aggregate market value.

          (c) The Company shall not consummate any such consolidation, merger,
sale or transfer unless the Principal Party shall have a sufficient number of
authorized shares of its Common Stock which have not been issued or reserved for
issuance to permit the exercise in full of the Rights in accordance with this
Section 13 and unless prior thereto the Company and such Principal Party shall
have executed and delivered to the Rights Agent a supplemental agreement
providing for the terms set forth in paragraphs (a) and (b) of this Section 13
and further providing that, as soon as practicable after the date of any
consolidation, merger or sale of assets mentioned in paragraph (a) of this
Section 13, the Principal Party will

               (i) prepare and file a registration statement under the Act, with
     respect to the Rights and the securities purchasable upon exercise of the
     Rights on an appropriate form, and will use its best efforts to cause such
     registration statement to (A) become effective as soon as practicable after
     such filing and (B) remain effective (with a prospectus at all times
     meeting the requirements of the Act) until the Expiration Date;

               (ii) take all such other action as may be necessary to enable the
     Principal Party to issue the securities purchasable upon exercise of the
     Rights, including but not limited to the registration or qualification of
     such securities under all requisite securities laws of jurisdictions of the
     various states and the listing of such securities on such exchanges and
     trading markets as may be necessary or appropriate and the securing of any
     regulatory approvals which may be required; and

                                      31
<PAGE>
 
               (iii) will deliver to holders of the Rights historical financial
     statements for the Principal Party and each of its Affiliates which comply
     in all respects with the requirements for registration on Form 10 under the
     Exchange Act.

The provisions of this Section 13 shall similarly apply to successive mergers or
consolidations or sales or other transfers.  In the event that a Section 13
Event shall occur at any time after the occurrence of a Section 11(a)(ii) Event,
the Rights which have not theretofore been exercised shall thereafter become
exercisable in the manner described in Section 13(a).

          (d) Notwithstanding anything in this Agreement to the contrary,
Section 13 shall not be applicable to a transaction described in subparagraphs
(x) and (y) of Section 13(a) if (i) such transaction is consummated with a
Person or Persons who acquired shares of Common Stock pursuant to a tender offer
or exchange offer for all outstanding shares of Common Stock which is a
Qualified Offer as such term is defined in Section 11(a)(ii) hereof (or a wholly
owned subsidiary of any such Person or Persons), (ii) the price per share of
Common Stock offered in such transaction is not less than the price per share of
Common Stock paid to all holders of shares of Common Stock whose shares were
purchased pursuant to such tender offer or exchange offer and (iii) the form of
consideration being offered to the remaining holders of shares of Common Stock
pursuant to such transaction is the same as the form of consideration paid
pursuant to such tender offer or exchange offer.  Upon consummation of any such
transaction contemplated by this Section 13(d), all Rights hereunder shall
expire.

          Section 14.  Fractional Rights and Fractional Shares.
                       --------------------------------------- 

          (a) The Company shall not be required to issue fractions of Rights,
except prior to the Distribution Date as provided in Section 11(p) hereof, or to
distribute Rights Certificates which evidence fractional Rights.  In lieu of
such fractional Rights, the Company shall pay to the registered holders of the
Rights Certificates with regard to which such fractional Rights would otherwise
be issuable, an amount in cash equal to the same fraction of the current market
value of a whole Right.  For purposes of this Section 14(a), the current market
value of a whole Right shall be the closing price of the Rights for the Trading
Day immediately prior to the date on which such fractional Rights would have
been otherwise issuable.  The closing price of the Rights for any day shall be
the last sale price, regular way, or, in case no such sale takes place on such

                                      32
<PAGE>
 
day, the average of the closing bid and asked prices, regular way, in either
case as reported in the principal consolidated transaction reporting system with
respect to securities listed or admitted to trading on the New York Stock
Exchange or, if the Rights are not listed or admitted to trading on the New York
Stock Exchange, as reported in the principal consolidated transaction reporting
system with respect to securities listed on the principal national securities
exchange on which the Rights are listed or admitted to trading, or if the Rights
are not listed or admitted to trading on any national securities exchange, the
last quoted price or, if not so quoted, the average of the high bid and low
asked prices in the over-the-counter market, as reported by NASDAQ or such other
system then in use or, if on any such date the Rights are not quoted by any such
organization, the average of the closing bid and asked prices as furnished by a
professional market maker making a market in the Rights, selected by the Board.
If on any such date no such market maker is making a market in the Rights, the
fair value of the Rights on such date as determined in good faith by the Board
shall be used.

          (b) Following the occurrence of a Triggering Event, the Company shall
not be required to issue fractions of shares of Common Stock upon exercise of
the Rights or to distribute certificates which evidence fractional shares of
Common Stock.  In lieu of fractional shares of Common Stock, the Company may pay
to the registered holders of Rights Certificates at the time such Rights are
exercised as herein provided an amount in cash equal to the same fraction of the
current market value of one (1) share of Common Stock.  For purposes of this
Section 14(b), the current market value of one share of Common Stock shall be
the closing price of one share of Common Stock (as determined pursuant to
Section 11(d) hereof) for the Trading Day immediately prior to the date of such
exercise.

          (c) The holder of a Right by the acceptance of the Rights expressly
waives his right to receive any fractional Rights or any fractional shares upon
exercise of a Right, except as permitted by this Section 14.

          Section 15.  Rights of Action.  All rights of action in respect of
                       ----------------                                     
this Agreement are vested in the respective registered holders of the Rights
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Stock); and any registered holder of any Rights Certificate (or, prior to
the Distribution Date, of the Common Stock), without the consent of the Rights
Agent or of the holder of any other Rights Certificate (or, prior to the
Distribution Date, of the Common Stock), may, in his own behalf and for his own

                                      33
<PAGE>
 
benefit, enforce, and may institute and maintain any suit, action or proceeding
against the Company to enforce, or otherwise act in respect of, his right to
exercise the Rights evidenced by such Rights Certificate in the manner provided
in such Rights Certificate and in this Agreement.  Without limiting the
foregoing or any remedies available to the holders of Rights, it is specifically
acknowledged that the holders of Rights would not have an adequate remedy at law
for any breach of this Agreement and shall be entitled to specific performance
of the obligations hereunder and injunctive relief against actual or threatened
violations of the obligations hereunder of any Person subject to this Agreement.

          Section 16.  Agreement of Rights Holders.  Every holder of a Right by
                       ---------------------------                             
accepting the same consents and agrees with the Company and the Rights Agent and
with every other holder of a Right that:

          (a) prior to the Distribution Date, the Rights will be transferable
only in connection with the transfer of Common Stock;

          (b) after the Distribution Date, the Rights Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the principal office or offices of the Rights Agent designated for such
purposes, duly endorsed or accompanied by a proper instrument of transfer and
with the appropriate forms and certificates fully executed;

          (c) subject to Section 6(a) and Section 7(f) hereof, the Company and
the Rights Agent may deem and treat the person in whose name a Rights
Certificate (or, prior to the Distribution Date, the associated Common Stock
certificate) is registered as the absolute owner thereof and of the Rights
evidenced thereby (not-withstanding any notations of ownership or writing on the
Rights Certificates or the associated Common Stock certificate made by anyone
other than the Company or the Rights Agent) for all purposes whatsoever, and
neither the Company nor the Rights Agent, subject to the last sentence of
Section 7(e) hereof, shall be required to be affected by any notice to the
contrary; and

          (d) notwithstanding anything in this Agreement to the contrary,
neither the Company nor the Rights Agent shall have any liability to any holder
of a Right or other Person as a result of its inability to perform any of its
obligations under this Agreement by

                                       34
<PAGE>
 
reason of any preliminary or permanent injunction or other order, decree or
ruling issued by a court of competent jurisdiction or by a governmental,
regulatory or administrative agency or commission, or any statute, rule,
regulation or executive order promulgated or enacted by any governmental
authority, prohibiting or otherwise restraining performance of such obligation;
provided, however, the Company must use its best efforts to have any such order,
- - --------  -------
decree or ruling lifted or otherwise overturned as soon as possible.

          Section 17.  Rights Certificate Holder Not Deemed a Shareholder.  No
                       --------------------------------------------------     
holder, as such, of any Rights Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the shares of Common Stock
or any other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Rights Certificate be construed to confer upon the holder of any
Rights Certificate, as such, any of the rights of a shareholder of the Company
or any right to vote for the election of directors or upon any matter submitted
to shareholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
shareholders (except as provided in Section 24 hereof), or to receive dividends
or subscription rights, or otherwise, until the Right or Rights evidenced by
such Rights Certificate shall have been exercised in accordance with the
provisions hereof.

          Section 18.  Concerning the Rights Agent.
                       --------------------------- 

          (a) The Company agrees to pay to the Rights Agent reasonable
compensation for all services rendered by it hereunder and, from time to time,
on demand of the Rights Agent, its reasonable expenses and counsel fees and
disbursements and other disbursements incurred in the administration and
execution of this Agreement and the exercise and performance of its duties
hereunder.  The Company also agrees to indemnify the Rights Agent for, and to
hold it harmless against, any loss, liability, or expense, incurred without
negligence, bad faith or willful misconduct on the part of the Rights Agent, for
anything done or omitted by the Rights Agent in connection with the acceptance
and administration of this Agreement, including the costs and expenses of
defending against any claim of liability in the premises.

          (b) The Rights Agent shall be protected and shall incur no liability
for or in respect of any action taken, suffered or omitted by it in connection
with its

                                       35
<PAGE>
 
administration of this Agreement in reliance upon any Rights Certificate or
certificate for Common Stock or for other securities of the Company, instrument
of assignment or transfer, power of attorney, endorsement, affidavit, letter,
notice, direction, consent, certificate, statement, or other paper or document
believed by it to be genuine and to be signed, executed and, where necessary,
verified or acknowledged, by the proper Person or Persons.

          Section 19.  Merger or Consolidation or Change of Name of Rights
                       ---------------------------------------------------
Agent.

          (a) Any corporation into which the Rights Agent or any successor
Rights Agent may be merged or with which it may be consolidated, or any
corporation resulting from any merger or consolidation to which the Rights Agent
or any successor Rights Agent shall be a party, or any corporation succeeding to
the corporate trust or stock transfer business of the Rights Agent or any
successor Rights Agent, shall be the successor to the Rights Agent under this
Agreement without the execution or filing of any paper or any further act on the
part of any of the parties hereto; but only if such corporation would be
eligible for appointment as a successor Rights Agent under the provisions of
Section 21 hereof.  In case at the time such successor Rights Agent shall
succeed to the agency created by this Agreement, any of the Rights Certificates
shall have been countersigned but not delivered, any such successor Rights Agent
may adopt the countersignature of a predecessor Rights Agent and deliver such
Rights Certificates so countersigned; and in case at that time any of the Rights
Certificates shall not have been countersigned, any successor Rights Agent may
countersign such Rights Certificates either in the name of the predecessor or in
the name of the successor Rights Agent; and in all such cases such Rights
Certificates shall have the full force provided in the Rights Certificates and
in this Agreement.

          (b) In case at any time the name of the Rights Agent shall be changed
and at such time any of the Rights Certificates shall have been countersigned
but not delivered, the Rights Agent may adopt the countersignature under its
prior name and deliver Rights Certificates so countersigned; and in case at that
time any of the Rights Certificates shall not have been countersigned, the
Rights Agent may countersign such Rights Certificates either in its prior name
or in its changed name; and in all such cases such Rights Certificates shall
have the full force provided in the Rights Certificates and in this Agreement.

                                       36
<PAGE>
 
          Section 20.  Duties of Rights Agent.  The Rights Agents undertakes
                       ---------------------- 
the duties and obligations imposed by this Agreement upon the following terms
and conditions, by all of which the Company and the holders of Rights
Certificates, by their acceptance thereof, shall be bound:

          (a) The Rights Agent may consult with legal counsel (who may be legal
counsel for the Company), and the opinion of such counsel shall be full and
complete authorization and protection to the Rights Agent as to any action taken
or omitted by it in good faith and in accordance with such opinion.

          (b) Whenever in the performance of its duties under this Agreement the
Rights Agent shall deem it necessary or desirable that any fact or matter
(including, without limitation, the identity of any Acquiring Person or Adverse
Person and the determination of Current Market Price) be proved or established
by the Company prior to taking or suffering any action hereunder, such fact or
matter (unless other evidence in respect thereof be herein specifically
prescribed) may be deemed to be conclusively proved and established by a
certificate signed by the Chairman of the Board, the President, any Vice
President, the Treasurer, any Assistant Treasurer, the Secretary or any
Assistant Secretary of the Company and delivered to the Rights Agent; and such
certificate shall be full authorization to the Rights Agent for any action taken
or suffered in good faith by it under the provisions of this Agreement in
reliance upon such certificate.

               (c) The Rights Agent shall be liable hereunder only for its own
negligence, bad faith or willful misconduct.

          (d) The Rights Agent shall not be liable for or by reason of any of
the statements of fact or recitals contained in this Agreement or in the Rights
Certificates or be required to verify the same (except as to its
countersignature on such Rights Certificates), but all such statements and
recitals are and shall be deemed to have been made by the Company only.

          (e) The Rights Agent shall not be under any responsibility in respect
of the validity of this Agreement or the execution and delivery hereof (except
the due execution hereof by the Rights Agent) or in respect of the validity or
execution of any Rights Certificate (except its countersignature thereof); nor
shall it be responsible for any breach by the Company of any covenant or
condition contained in this Agreement or in any Rights Certificate; nor shall it
be responsible for any adjustment required

                                      37
<PAGE>
 
under the provisions of Section 11 or Section 13 hereof or responsible for the
manner, method or amount of any such adjustment or the ascertaining of the
existence of facts that would require any such adjustment (except with respect
to the exercise of Rights evidenced by Rights Certificates after actual notice
of any such adjustment); nor shall it by any act hereunder be deemed to make any
representation or warranty as to the authorization or reservation of any shares
of Common Stock to be issued pursuant to this Agreement or any Rights
Certificate or as to whether any shares of Common Stock will, when so issued, be
validly authorized and issued, fully paid and nonassessable.

          (f) The Company agrees that it will perform, execute, acknowledge and
deliver or cause to be performed, executed, acknowledged and delivered all such
further and other acts, instruments and assurances as may reasonably be required
by the Rights Agent for the carrying out or performing by the Rights Agent of
the provisions of this Agreement.

          (g) The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from the
Chairman of the Board, the President, any Vice President, the Secretary, any
Assistant Secretary, the Treasurer or any Assistant Treasurer of the Company,
and to apply to such officers for advice or instructions in connection with its
duties, and it shall not be liable for any action taken or suffered to be taken
by it in good faith in accordance with instructions of any such officer.

          (h) The Rights Agent and any shareholder, director, officer or
employee of the Rights Agent may buy, sell or deal in any of the Rights or other
securities of the Company or become pecuniarily interested in any transaction in
which the Company may be interested, or contract with or lend money to the
Company or otherwise act as fully and freely as though it were not Rights Agent
under this Agreement.  Nothing herein shall preclude the Rights Agent from
acting in any other capacity for the Company or for any other legal entity.

          (i) The Rights Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the Company resulting from any such act, default,
neglect or misconduct; provided, however, reasonable care was exercised in the
                       --------  -------                                      
selection and continued employment thereof.

                                      38
<PAGE>
 
          (j) No provision of this Agreement shall require the Rights Agent to
expend or risk its own funds or otherwise incur any financial liability in the
performance of any of its duties hereunder or in the exercise of its rights if
there shall be reasonable grounds for believing that repayment of such funds or
adequate indemnification against such risk or liability is not reasonably
assured to it.

          (k) If, with respect to any Rights Certificate surrendered to the
Rights Agent for exercise or transfer, the certificate attached to the form of
assignment or form of election to purchase, as the case may be, has either not
been completed or indicates an affirmative response to clause 1 and/or 2
thereof, the Rights Agent shall not take any further action with respect to such
requested exercise or transfer without first consulting with the Company.

          Section 21.  Change of Rights Agent.  The Rights Agent or any
                       ----------------------                          
successor Rights Agent may resign and be discharged from its duties under this
Agreement upon thirty (30) days' notice in writing mailed to the Company, and to
each transfer agent of the Common Stock, by registered or certified mail, and,
if such resignation occurs after the Distribution Date, to the registered
holders of the Rights Certificates by first-class mail.  The Company may remove
the Rights Agent or any successor Rights Agent upon thirty (30) days' notice in
writing, mailed to the Rights Agent or successor Rights Agent, as the case may
be, and to each transfer agent of the Common Stock, by registered or certified
mail, and, if such removal occurs after the Distribution Date, to the holders of
the Rights Certificates by first-class mail.  If the Rights Agent shall resign
or be removed or shall otherwise become incapable of acting, the Company shall
appoint a successor to the Rights Agent.  If the Company shall fail to make such
appointment within a period of thirty (30) days after giving notice of such
removal or after it has been notified in writing of such resignation or
incapacity by the resigning or incapacitated Rights Agent or by the holder of a
Rights Certificate (who shall, with such notice, submit his Rights Certificate
for inspection by the Company), then any registered holder of any Rights
Certificate may apply to any court of competent jurisdiction for the appointment
of a new Rights Agent.  Any successor Rights Agent, whether appointed by the
Company or by such a court, shall be (a) a legal business entity organized and
doing business under the laws of the United States or of the State of Texas or
the Commonwealth of

                                       39
<PAGE>
 
Virginia (or of any other state of the United States so long as such corporation
is authorized to do business as a banking institution in the State of Texas or
the Commonwealth of Virginia, in good standing, having a principal office in the
State of Texas, the Commonwealth of Virginia, or the Commonwealth of
Massachusetts, which is authorized under such laws to exercise corporate trust
or stock transfer powers and is subject to supervision or examination by federal
or state authority and which has at the time of its appointment as Rights Agent
a combined capital and surplus of at least $50,000,000 or (b) an affiliate of a
legal business entity, described in clause (a) of this sentence. After
appointment, the successor Rights Agent shall be vested with the same powers,
rights, duties and responsibilities as if it had been originally named as Rights
Agent without further act or deed; but the predecessor Rights Agent shall
deliver and transfer to the successor Rights Agent any property at the time held
by it hereunder, and execute and deliver any further assurance, conveyance, act
or deed necessary for the purpose. Not later than the effective date of any such
appointment, the Company shall file notice thereof in writing with the
predecessor Rights Agent and each transfer agent of the Common Stock, and, if
such appointment occurs after the Distribution Date, mail a notice thereof in
writing to the registered holders of the Rights Certificates. Failure to give
any notice provided for in this Section 21, however, or any defect therein,
shall not affect the legality or validity of the resignation or removal of the
Rights Agent or the appointment of the successor Rights Agent, as the case may
be.

          Section 22.  Issuance of New Rights Certificates.  Notwithstanding any
                       -----------------------------------                      
of the provisions of this Agreement or of the Rights to the contrary, the
Company may, at its option, issue new Rights Certificates evidencing Rights in
such form as may be approved by the Board to reflect any adjustment or change in
the Purchase Price and the number or kind or class of shares or other securities
or property purchasable under the Rights Certificates made in accordance with
the provisions of this Agreement.  In addition, in connection with the issuance
or sale of shares of Common Stock following the Distribution Date and prior to
the redemption or expiration of the Rights, the Company (a) shall, with respect
to shares of Common Stock so issued or sold pursuant to the exercise of stock
options or under any employee plan or arrangement, granted or awarded as of the
Distribution Date, or upon the exercise, conversion or exchange of securities
hereinafter issued by the Company, and (b) may, in any other case, if deemed
necessary or appropriate by the Board of Directors of the Company, issue Rights

                                      40
<PAGE>
 
Certificates representing the appropriate number of Rights in connection with
such issuance or sale; provided, however, that (i) no such Rights Certificate
                       --------  -------                                     
shall be issued if, and to the extent that, the Company shall be advised by
counsel that such issuance would create a significant risk of material adverse
tax consequences to the Company or the Person to whom such Rights Certificate
would be issued, and (ii) no such Rights Certificate shall be issued if, and to
the extent that, appropriate adjustment shall otherwise have been made in lieu
of the issuance thereof.

          Section 23.  Redemption and Termination.
                       -------------------------- 

                                      41
<PAGE>
 
          (a) The Board of Directors of the Company may, at its option, at any
time prior to the earlier of (i) the Close of Business on the tenth Business Day
following the Stock Acquisition Date, or (ii) the Final Expiration Date, redeem
all but not less than all of the then outstanding Rights at a redemption price
of $.01 per Right, as such amount may be appropriately adjusted to reflect any
stock split, stock dividend or similar transaction occurring after the date
hereof (such redemption price being hereinafter referred to as the "Redemption
Price"); provided, however, if the Board of Directors of the Company authorizes
         --------  -------                                                     
redemption of the Rights in either of the circumstances set forth in clauses (i)
and (ii) below, then there must be Continuing Directors then in office and such
authorization shall require the concurrence of a majority of such Continuing
Directors: (i) such authorization occurs on or after the time a Person becomes
an Acquiring Person, or (ii) such authorization occurs on or after the date of a
change (resulting from a proxy or consent solicitation) in a majority of the
directors in office at the commencement of such solicitation if any Person who
is a participant in such solicitation has stated (or, if upon the commencement
of such solicitation, a majority of the Board of Directors of the Company has
determined in good faith) that such Person (or any of its Affiliates or
Associates) intends to take, or may consider taking, any action which would
result in such Person becoming an Acquiring Person or which would cause the
occurrence of a Triggering Event unless, concurrent with such solicitation, such
Person (or one or more of its Affiliates or Associates) is making a cash tender
offer pursuant to a Schedule 14D-1 (or any successor form) filed with the
Securities and Exchange Commission for all outstanding shares of Common Stock
not beneficially owned by such Person (or by its Affiliates or Associates).
Notwithstanding the foregoing, the Board of Directors of the Company may not
redeem any Rights following its declaration that any Person is an Adverse
Person.  Notwithstanding anything contained in this Agreement to the contrary,
the Rights shall not be exercisable after the first occurrence of a Section
11(a)(ii) Event until such time as the Company's right of redemption hereunder
has expired.  The Company may, at its option, pay the Redemption Price in cash,
shares of Common Stock (based on the Current Market Price, as defined in Section
11(d) hereof, of the Common Stock at the time of redemption) or any other form
of consideration deemed appropriate by the Board of Directors.

          (b) Immediately upon the action of the Board of Directors of the
Company ordering the redemption of the Rights, evidence of which shall have been
filed with the Rights Agent and without any further action and without any

                                      42
<PAGE>
 
notice, the right to exercise the Rights will terminate and the only right
thereafter of the holders of Rights shall be to receive the Redemption Price for
each Right so held.  Promptly after the action of the Board of Directors
ordering the redemption of the Rights, the Company shall give notice of such
redemption to the Rights Agent and the holders of the then outstanding Rights by
mailing such notice to all such holders at each holder's last address as it
appears upon the registry books of the Rights Agent or, prior to the
Distribution Date, on the registry books of the transfer agent for the Common
Stock.  Any notice which is mailed in the manner herein provided shall be deemed
given, whether or not the holder receives the notice.  Each such notice of
redemption will state the method by which the payment of the Redemption Price
will be made.

          (c) Notwithstanding the provisions of Section 23(a) hereof, in the
event that a majority of the Board of Directors of the Company is elected by
shareholder action by written consent, or is comprised of persons elected at a
meeting of shareholders who were not nominated by the Board of Directors of the
Company in office immediately prior to such meeting, then for a period of one
hundred and eighty (180) days following the effectiveness of such election the
Rights shall not be redeemed if such redemption is reasonably likely to have the
purpose or effect of allowing any Person to become an Acquiring Person or
otherwise facilitating the occurrence of a Triggering Event or a transaction
with an Acquiring Person.  Any determination with respect to the foregoing shall
require the concurrence of the Continuing Directors.

          Section 24.  Notice of Certain Events.
                       ------------------------ 

          (a) In case the Company shall propose, at any time after the
Distribution Date, (i) to pay any dividend payable in stock of any class to the
holders of Common Stock or to make any other distribution to the holders of
Common Stock (other than a regular quarterly cash dividend out of earnings or
retained earnings of the Company), or (ii) to offer to the holders of Common
Stock rights or warrants to subscribe for or to purchase any additional shares
of Common Stock or shares of stock of any class or any other securities, rights
or options, or (iii) to effect any reclassification of its Common Stock (other
than a reclassification involving only the subdivision of outstanding shares of
Common Stock), or (iv) to effect any consolidation or merger into or with any
other Person (other than a Subsidiary of the Company in a transaction which
complies with Section 11(o) hereof), or to effect any sale or other transfer (or
to permit one or more of its

                                      43
<PAGE>
 
Subsidiaries to effect any sale or other transfer), in one transaction or a
series of related transactions, of more than 50% of the assets, cash flow or
earning power of the Company and its Subsidiaries (taken as a whole) to any
other Person or Persons (other than the Company and/or any of its Subsidiaries
in one or more transactions each of which complies with Section 11(o) hereof),
or (v) to effect the liquidation, dissolution or winding up of the Company,
then, in each such case, the Company shall give to each holder of a Rights
Certificate, to the extent feasible and in accordance with Section 25 hereof, a
notice of such proposed action, which shall specify the record date for the
purposes of such stock dividend, distribution of rights or warrants, or the date
on which such reclassification, consolidation, merger, sale, transfer,
liquidation, dissolution, or winding up is to take place and the date of
participation therein by the holders of the shares of Common Stock, if any such
date is to be fixed, and such notice shall be so given in the case of any action
covered by clause (i) or (ii) above at least twenty (20) days prior to the
record date for determining holders of the shares of Common Stock for purposes
of such action, and in the case of any such other action, at least twenty (20)
days prior to the date of the taking of such proposed action or the date of
participation therein by the holders of the shares of Common Stock whichever
shall be the earlier.

          (b) In case any of the events set forth in Section 11(a)(ii) hereof
shall occur, then, in any such case, the Company shall as soon as practicable
thereafter give to each holder of a Rights Certificate, to the extent feasible
and in accordance with Section 25 hereof, a notice of the occurrence of such
event, which shall specify the event and the consequences of the event to
holders of Rights under Section 11(a)(ii) hereof.

          Section 25.  Notices.  Notices or demands authorized by this Agreement
                       -------                                                  
to be given or made by the Rights Agent or by the holder of any Rights
Certificate to or on the Company shall be sufficiently given or made if sent by
first-class mail, postage prepaid, addressed (until another address is filed in
writing by the Company with the Rights Agent) as follows:

          Atmos Energy Corporation
          Three Lincoln Centre, Suite 1800
          5430 LBJ Freeway
          Dallas, TX  75240
          Attention:  Corporate Secretary

                                      44
<PAGE>
 
Subject to the provisions of Section 21, any notice or demand authorized by this
Agreement to be given or made by the Company or by the holder of any Rights
Certificate to or on the Rights Agent shall be sufficiently given or made if
sent by first-class mail, postage prepaid, addressed (until another address is
filed in writing by the Rights Agent with the Company) as follows:

          BankBoston, N.A.
          c/o Boston Equiserve L.P.
          P.O. Box 1865
          Boston, MA  02105
          Attention: Client Administration
 
Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Rights Certificate (or, if
prior to the Distribution Date, to the holder of certificates representing
shares of Common Stock) shall be sufficiently given or made if sent by first-
class mail, postage prepaid, addressed to such holder at the address of such
holder as shown on the registry books of the Company.

                                      45
<PAGE>
 
          Section 26.  Supplements and Amendments.  Prior to the Distribution
                       --------------------------                            
Date, the Company and the Rights Agent shall, if the Company so directs,
supplement or amend any provision of this Agreement without the approval of any
holders of certificates representing shares of Common Stock, including, without
limitation, to substitute whole or fractional shares of preferred stock or
Common Stock for which the Rights may be exercised.  From and after the
Distribution Date, the Company and the Rights Agent shall, if the Company so
directs, supplement or amend this Agreement without the approval of any holders
of Rights Certificates in order (i) to cure any ambiguity, (ii) to correct or
supplement any provision contained herein which may be defective or inconsistent
with any other provisions herein, (iii) to shorten or lengthen any time period
hereunder (which lengthening or shortening, following the first occurrence of an
event set forth in clauses (i) or (ii) of the first provision to Section 23(a)
hereof, shall be effective only if there are Continuing Directors and shall
require the concurrence of a majority of such Continuing Directors), or (iv) to
change or supplement the provisions hereunder in any manner which the Company
may deem necessary or desirable and which shall not adversely affect the
interests of the holders of Rights Certificates (other than an Acquiring Person,
an Adverse Person or an Affiliate or Associate of any such Person); provided,
                                                                    -------- 
from and after the Distribution Date, this Agreement may not be supplemented or
amended to lengthen, pursuant to clause (iii) of this sentence, (A) a time
period relating to when the Rights may be redeemed at such time as the Rights
are not then redeemable, or (B) any other time period unless such lengthening is
for the purpose of protecting, enhancing or clarifying the rights of, and/or the
benefits to, the holders of Rights.  Upon the delivery of a certificate from an
appropriate officer of the Company which states that the proposed supplement or
amendment is in compliance with the terms of this Section 26, the Rights Agent
shall execute such supplement or amendment.  Prior to the Distribution Date, the
interests of the holders of Rights shall be deemed coincident with the interests
of the holders of Common Stock.  Notwithstanding anything herein to the
contrary, this Agreement may not be amended at a time when the Rights are not
redeemable.

          Section 27.  Successors.  All the covenants and provisions of this
                       ----------                                           
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

                                      46
<PAGE>
 
          Section 28.  Determinations and Actions by the Board of Directors,
                       -----------------------------------------------------
etc.  For all purposes of this Agreement, any calculation of the number of
shares of Common Stock outstanding at any particular time, including for
purposes of determining the particular percentage of such outstanding shares of
Common Stock of which any Person is the Beneficial Owner, shall be made in
accordance with the last sentence of Rule 13d-3(d)(1)(i) of the General Rules
and Regulations under the Exchange Act.  The Board of Directors of the Company
(with, where specifically provided for herein, the concurrence of the Continuing
Directors) shall have the exclusive power and authority to administer this
Agreement and to exercise all rights and powers specifically granted to the
Board (with, where specifically provided for herein, the concurrence of the
Continuing Directors) or to the Company, or as may be necessary or advisable in
the administration of this Agreement, including, without limitation, the right
and power to (i) interpret the provisions of this Agreement, and (ii) make all
determinations deemed necessary or advisable for the administration of this
Agreement (including a determination to redeem or not redeem the Rights, to
declare that a Person is an Adverse Person or to amend the Agreement and any
determination as to whether actions of any Person shall be such as to cause such
Person to beneficially own shares held by another Person.  All such actions,
calculations, interpretations and determinations (including, for purposes of
clause (y) below, all omissions with respect to the foregoing) which are done or
made by the Board (with, where specifically provided for herein, the concurrence
of the Continuing Directors) in good faith, shall (x) be final, conclusive and
binding on the Company, the Rights Agent, the holders of the Rights and all
other parties, and (y) not subject the Board or the Continuing Directors to any
liability to the holders of the Rights.

          Section 29.  Benefits of this Agreement.  Nothing in this Agreement
                       --------------------------                            
shall be construed to give to any Person other than the Company, the Rights
Agent and the registered holders of the Rights Certificates (and, prior to the
Distribution Date, registered holders of the Common Stock) any legal or
equitable right, remedy or claim under this Agreement; but this Agreement shall
be for the sole and exclusive benefit of the Company, the Rights Agent and the
registered holders of the Rights Certificates (and, prior to the Distribution
Date, registered holders of the Common Stock).

                                      47
<PAGE>
 
          Section 30.  Severability.  If any term, provision, covenant or
                       ------------                                      
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated;
                                                                               
provided, however, that notwithstanding anything in this Agreement to the
- - --------  -------                                                        
contrary, if any such term, provision, covenant or restriction is held by such
court or authority to be invalid, void or unenforceable and the Board of
Directors of the Company determines in its good faith judgment that severing the
invalid language from this Agreement would adversely affect the purpose or
effect of this Agreement, the right of redemption set forth in Section 23 hereof
shall be reinstated and shall not expire until the Close of Business on the
tenth Business Day following the date of such determination by the Board of
Directors.  Without limiting the foregoing, if any provision requiring a
majority of the Board of Directors of the Company to be Continuing Directors to
act is held by any court of competent jurisdiction or other authority to be
invalid, void or unenforceable, such determination shall then be made by the
Board of Directors of the Company in accordance with applicable law and the
Company's Articles of Incorporation and Bylaws.

          Section 31. Governing Law.  This Agreement, each Right and each Rights
                      -------------                                             
Certificate issued hereunder shall be deemed to be a contract made under the
laws of the State of Texas and for all purposes shall be governed by and
construed in accordance with the laws of such State applicable to contracts made
and to be performed entirely within such State, except Sections 18, 19, 20 and
21, for which all purposes that the rights and obligations of the Rights Agent
shall be governed and construed in accordance with the laws of the State of New
York.

          Section 32.  Counterparts.  This Agreement may be executed in any
                       ------------                                        
number of counterparts and each of such counterparts shall for all purposes be
deemed to be an original, and all such counterparts shall together constitute
but one and the same instrument.

          Section 33.  Descriptive Headings.  Descriptive headings of the
                       --------------------                              
several sections of this Agreement are inserted for convenience only and shall
not control or affect the meaning or construction of any of the provisions
hereof.

                                      48
<PAGE>

 
          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed, and their respective corporate seals to be hereunto affixed
and attested, all as of the day and year first above written.


Attest:                                 ATMOS ENERGY CORPORATION


By: /s/ Shirley A. Morgan               By: /s/ Robert W. Best
   ------------------------------       ----------------------------------
Name:  Shirley A. Morgan                Name:  Robert W. Best
Title: Assistant Corporate Secretary    Title: Chairman, President and CEO



Attest:                                 BANKBOSTON, N.A.

By:  /s/ Joshua P. McGinn               By: /s/ Micheal J. Lapolla
   --------------------------           ---------------------------------- 
Name:  Joshua P. McGinn                 Name:  Micheal J. Lapolla
Title: Senior Account Manager           Title: Administration Manager
        and Public Notary


                                      49

<PAGE>
 
                                                                       Exhibit A
                                                                       ---------



                         [Form of Rights Certificate]


Certificate No. R-                                               ________ Rights


NOT EXERCISABLE AFTER MAY 10, 2008, UNLESS EXTENDED PRIOR THERETO BY THE BOARD
OF DIRECTORS OR EARLIER IF REDEEMED BY THE COMPANY.  THE RIGHTS ARE SUBJECT TO
REDEMPTION, AT THE OPTION OF THE COMPANY, AT $.01 PER RIGHT ON THE TERMS SET
FORTH IN THE RIGHTS AGREEMENT.  UNDER CERTAIN CIRCUMSTANCES, RIGHTS
BENEFICIALLY OWNED BY AN ACQUIRING PERSON OR AN ADVERSE PERSON (AS SUCH TERMS
ARE DEFINED IN THE RIGHTS AGREEMENT) AND ANY SUBSEQUENT HOLDER OF SUCH RIGHTS
MAY BECOME NULL AND VOID.  [THE RIGHTS REPRESENTED BY THIS RIGHTS CERTIFICATE
ARE OR WERE BENEFICIALLY OWNED BY A PERSON WHO WAS OR BECAME AN ACQUIRING
[ADVERSE] PERSON OR AN AFFILIATE OR ASSOCIATE OF AN ACQUIRING [ADVERSE] PERSON
(AS SUCH TERMS ARE DEFINED IN THE RIGHTS AGREEMENT).  ACCORDINGLY, THIS RIGHTS
CERTIFICATE AND THE RIGHTS REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE
CIRCUMSTANCES SPECIFIED IN SECTION 7(e) OF SUCH AGREEMENT.] *


                              Rights Certificate

                           ATMOS ENERGY CORPORATION


          This certifies that                      , or registered assigns, is
the registered owner of the number

- - --------------------
 *   The portion of the legend in brackets shall be inserted only if applicable
     and shall replace the preceding sentence.
<PAGE>
 
of Rights set forth above, each of which entitles the owner thereof, subject to
the terms, provisions and conditions of the Rights Agreement, dated as of
November 12, 1997 (the "Rights Agreement"), between Atmos Energy Corporation, a
Texas and Virginia corporation (the "Company"), and BankBoston, N.A., a
national association with its principal place of business in Massachusetts (the
"Rights Agent"), to purchase from the Company at any time prior to 5:00 P.M.
(Boston, Massachusetts time) on May 10, 2008 (unless such date is extended prior
thereto by the Board of Directors) at the office or offices of the Rights Agent
designated for such purpose, or its successors as Rights Agent, one fully paid,
non-assessable share of Common Stock of the Company, no par value, at a purchase
price of $80 per one share (the "Purchase Price"), upon presentation and
surrender of this Rights Certificate with the Form of Election to Purchase and
related Certificate duly executed.  All capitalized terms which are not defined
herein shall have the meanings ascribed to them in the Rights Agreement.  The
number of Rights evidenced by this Rights Certificate (and the number of shares
which may be purchased upon exercise thereof) set forth above, and the Purchase
Price per 


                                       2
<PAGE>
 
share set forth above, are the number and Purchase Price as of May 10, 1998,
based on the Common Stock as constituted at such date. The Company reserves the
right to require prior to the occurrence of a Triggering Event that a number of
Rights be exercised so that only whole shares of Common Stock will be issued.

          Upon the occurrence of a Section 11(a)(ii) Event, if the Rights
evidenced by this Rights Certificate are beneficially owned by (i) an Acquiring
Person, an Adverse Person or an Affiliate or Associate of any such Person, (ii)
a transferee of any such Acquiring Person, Adverse Person, Associate or
Affiliate, or (iii) under certain circumstances specified in the Rights
Agreement, a transferee of a person who, after such transfer, became an
Acquiring Person, an Adverse Person or an Affiliate or Associate of any such
Person, such Rights shall become null and void and no holder hereof shall have
any right with respect to such Rights from and after the occurrence of such
Section 11(a)(ii) Event.

          As provided in the Rights Agreement, the Purchase Price and the
number and kind of shares of Common Stock or other securities, which may be
purchased upon the exercise of the Rights evidenced by this Rights 


                                       3
<PAGE>
 
Certificate are subject to modification and adjustment upon the happening of
certain events, including Triggering Events.

          This Rights Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties and immunities hereunder of the
Rights Agent, the Company and the holders of the Rights Certificates, which
limitations of rights include the temporary suspension of the exercisability of
such Rights under the specific circumstances set forth in the Rights Agreement.
Copies of the Rights Agreement are on file at the above-mentioned office of the
Rights Agent and are also available upon written request to the Company.

          This Rights Certificate, with or without other Rights Certificates,
upon surrender at the principal office or offices of the Rights Agent designated
for such purpose, may be exchanged for another Rights Certificate or Rights
Certificates of like tenor and date evidencing 

                                       4
<PAGE>
 
Rights entitling the holder to purchase a like aggregate number of shares of
Common Stock as the Rights evidenced by the Rights Certificate or Rights
Certificates surrendered shall have entitled such holder to purchase. If this
Rights Certificate shall be exercised in part, the holder shall be entitled to
receive upon surrender hereof another Rights Certificate or Rights Certificates
for the number of whole Rights not exercised.

          Subject to the provisions of the Rights Agreement, the Rights
evidenced by this Certificate may, unless the Board of Directors shall have made
a determination that a Person is an Adverse Person, be redeemed by the Company
at its option at a redemption price of $.01 per Right at any time prior to the
earlier of the close of business on (i) the tenth Business Day following the
Stock Acquisition Date, and (ii) the Final Expiration Date.  Under certain
circumstances set forth in the Rights Agreement, the decision to redeem shall
require the concurrence of a majority of the Continuing Directors.  The
foregoing notwithstanding, the Rights generally may not be redeemed for one
hundred eighty (180) days following a change in a majority of the Board as a
result of a proxy contest.


                                       5
<PAGE>
 
          No fractional shares of Common Stock will be issued upon the exercise
of any Right or Rights evidenced hereby, but in lieu thereof a cash payment will
be made, as provided in the Rights Agreement.

          No holder of this Rights Certificate shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of shares of Common
Stock or of any other securities of the Company which may at any time be
issuable on the exercise hereof, nor shall anything contained in the Rights
Agreement or herein be construed to confer upon the holder hereof, as such, any
of the rights of a shareholder of the Company or any right to vote for the
election of directors or upon any matter submitted to shareholders at any
meeting thereof, or to give consent to or withhold consent from any corporate
action, or, to receive notice of meetings or other actions affecting
shareholders (except as provided in the Rights Agreement), or to receive
dividends or subscription rights, or otherwise, until the Right or Rights
evidenced by this Rights Certificate shall have been exercised as provided in
the Rights Agreement.

          This Rights Certificate shall not be valid or obligatory for any
purpose until it shall have been 


                                       6
<PAGE>
 
countersigned by the Rights Agent.


                                       7
<PAGE>
 
          WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal.
Dated as of _________ __, ____



ATTEST:                                 ATMOS ENERGY CORPORATION



                                        By
- - -------------------------------------      -------------------------------------
            Secretary                      Title:




Countersigned:

BANKBOSTON, N.A.


By
   ----------------------------------
   Authorized Signature


                                       8
<PAGE>
 
                 [Form of Reverse Side of Rights Certificate]

                              FORM OF ASSIGNMENT
                              ------------------

               (To be executed by the registered holder if such
              holder desires to transfer the Rights Certificate.)

               FOR VALUE RECEIVED ______________________________________________

hereby sells, assigns and transfers unto _______________________________________

________________________________________________________________________________
                 (Please print name and address of transferee)

________________________________________________________________________________

this Rights Certificate, together with all right, title and interest therein,

and does hereby irrevocably constitute and appoint __________________ Attorney,

to transfer the within Rights Certificate on the books of the within-named

Company, with full power of substitution.

Dated: __________________, ____



                                        ________________________________________
                                        Signature


Signature Guaranteed:
<PAGE>
 
                                  Certificate
                                  -----------

          The undersigned hereby certifies by checking the appropriate boxes
that:

          (1)  this Rights Certificate [ ] is [ ] is not being sold, assigned
and transferred by or on behalf of a Person who is or was an Acquiring Person,
an Adverse Person or an Affiliate or Associate of any such Person;

          (2)  after due inquiry and to the best knowledge of the undersigned,
he, she or it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or subsequently became an Acquiring
Person, an Adverse Person or an Affiliate or Associate of any such Person.


Dated: _______________, ____            ________________________________________
                                        Signature

Signature Guaranteed:
<PAGE>
 
                                    NOTICE
                                    ------


          The signature to the foregoing Assignment and Certificate must
correspond to the name as written upon the face of this Rights Certificate in
every particular, without alteration or enlargement or any change whatsoever.
<PAGE>
 
                         FORM OF ELECTION TO PURCHASE
                         ----------------------------

                      (To be executed if holder desires 
                      to exercise Rights represented by
                      the Rights Certificate.)


To:  ATMOS ENERGY CORPORATION:

          The undersigned hereby irrevocably elects to exercise _______________
Rights represented by this Rights Certificate to purchase the shares of Common
Stock issuable upon the exercise of the Rights (or such other securities of the
Company or of any other person which may be issuable upon the exercise of the
Rights) and requests that certificates for such shares be issued in the name of
and delivered to:


Please insert social security
or other identifying number

________________________________________________________________________________
                        (Please print name and address)

________________________________________________________________________________



          If such number of Rights shall not be all the Rights evidenced by this
Rights Certificate, a new Rights Certificate for the balance of such Rights
shall be registered in the name of and delivered to:
<PAGE>
 
Please insert social security
or other identifying number


________________________________________________________________________________
                        (Please print name and address)

________________________________________________________________________________

________________________________________________________________________________

Dated:  _______________, ____



                                        ________________________________________
                                        Signature



Signature Guaranteed:



                                  Certificate
                                  -----------

          The undersigned hereby certifies by checking the appropriate boxes
that:

          (1)  the Rights evidenced by this Rights Certificate [ ] are [ ] are
not being exercised by or on behalf of a Person who is or was an Acquiring
Person, an Adverse Person or an Affiliate or Associate of any such Person;

          (2)  after due inquiry and to the best knowledge of the undersigned,
he, she or it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or became an Acquiring Person, an
Adverse Person or an Affiliate or Associate of any such Person.
<PAGE>
 
Dated: ______________, ____             ________________________________________
                                        Signature



Signature Guaranteed:
<PAGE>
 
                                    NOTICE
                                    ------



          The signature to the foregoing Election to Purchase and Certificate
must correspond to the name as written upon the face of this Rights Certificate
in every particular, without alteration or enlargement or any change whatsoever.
<PAGE>
 
                                                                       Exhibit B
                                                                       ---------


                         SUMMARY OF RIGHTS TO PURCHASE
                                 COMMON STOCK

     On November 12, 1997, the Board of Directors of Atmos Energy Corporation
(the "Company") declared a dividend distribution of one Right for each
outstanding share of the Company's Common Stock to shareholders of record at the
close of business on May 10, 1998 (the "Record Date"). Each Right entitles the
registered holder to purchase from the Company one share of Common Stock at a
Purchase Price of $80 per share, subject to adjustment. The description and
terms of the Rights are set forth in a Rights Agreement (the "Rights Agreement")
between the Company and BankBoston, N.A., as Rights Agent.

     Initially, the Rights will be attached to all Common Stock certificates
representing shares then outstanding, and no separate Rights Certificates will
be distributed.  Subject to certain exceptions specified in the Rights
Agreement, the Rights will separate from the Common Stock and a Distribution
Date will occur upon the earlier of (i) 10 business days following a public
announcement that a person or group of affiliated or associated persons (an
"Acquiring Person") has acquired, or obtained the right to acquire, beneficial
ownership of 15% or more of the outstanding shares of Common Stock (the "Stock
Acquisition Date"), other than as a result of repurchases of stock by the
Company or certain inadvertent actions by institutional or certain other
shareholders, (ii) 10 business days (or such later date as the Board shall
determine) following the commencement of a tender offer or exchange offer that
would result in a person or group becoming an Acquiring Person or (iii) 10
business days after the Board of Directors of the Company shall declare any
person to be an Adverse Person, upon a determination that such person, alone, or
together with its affiliates and associates, has become the beneficial owner of
an amount of Common Stock which the Board of Directors determines to be
substantial (which amount shall in no event be less than 10% of the shares of
Common Stock then outstanding) and a determination by at least a majority 
<PAGE>
 
of the Board of Directors who are not officers of the Company, after reasonable
inquiry and investigation, including consultation with such persons as such
directors shall deem appropriate, that (a) such beneficial ownership by such
person is intended to cause the Company to repurchase the Common Stock
beneficially owned by such person or to cause pressure on the Company to take
action or enter into a transaction or series of transactions intended to provide
such person with short-term financial gain under circumstances where the Board
of Directors determines that the best long-term interests of the Company and its
shareholders would not be served by taking such action or entering into such
transactions or series of transactions at that time or (b) such beneficial
ownership is causing or reasonably likely to cause a material adverse impact
(including, but not limited to, causing, or reasonably likely to cause, the
Company to be a subsidiary of a registered holding company under the Public
Utility Holding Company Act of 1935, as amended) on the business or prospects of
the Company.

     Until the Distribution Date, (i) the Rights will be evidenced by the Common
Stock certificates and will be transferred with and only with such Common Stock
certificates, (ii) new Common Stock certificates issued after the Record Date
will contain a notation incorporating the Rights Agreement by reference and
(iii) the surrender for transfer of any certificates for Common Stock
outstanding will also constitute the transfer of the Rights associated with the
Common Stock represented by such certificate. Pursuant to the Rights Agreement,
the Company reserves the right to require prior to the occurrence of a
Triggering Event (as defined below) that, upon any exercise of Rights, a number
of Rights be exercised so that only whole shares of Common Stock will be issued.

     The Rights are not exercisable until the Distribution Date and will expire
at 5:00 P.M., Boston, Massachusetts time on May 10, 2008, unless extended prior
thereto by the Board of Directors or earlier if redeemed by the Company as
described below.

     As soon as practicable after the Distribution Date, Rights Certificates
will be mailed to holders of record of the Common Stock as of the close of
business on the 


                                       2
<PAGE>
 
Distribution Date and, thereafter, the separate Rights Certificates alone will
represent the Rights. Except as otherwise determined by the Board of Directors,
only shares of Common Stock issued prior to the Distribution Date will be issued
with Rights.

     In the event that the Board of Directors determines that a person is an
Adverse Person or a person becomes an Acquiring Person (except pursuant to an
offer for all outstanding shares of Common Stock which the independent
directors, who are not associated with an Acquiring Person, determine to be fair
to shareholders and otherwise in the best interests of the Company and its
shareholders (a "Qualified Offer")), each holder of a Right will thereafter have
the right to receive, upon exercise, Common Stock (or, in certain circumstances,
cash, property or other securities of the Company) having a value equal to two
times the exercise price of the Right.  Notwithstanding any of the foregoing,
following the occurrence of the events set forth in this paragraph, all Rights
that are, or (under certain circumstances specified in the Rights Agreement)
were, beneficially owned by any Acquiring Person or Adverse Person will be null
and void.

     For example, at an exercise price of $80 per Right, each Right not owned by
an Acquiring Person or Adverse Person (or by certain related parties) following
an event set forth in the preceding paragraph would entitle its holder to
purchase $160 worth of Common Stock (or other consideration, as noted above) for
$80.  Assuming that the Common Stock had a per share value of $40 at such time,
the holder of each valid Right would be entitled to purchase 4 shares of Common
Stock for $80.

     In the event that, at any time following the Stock Acquisition Date, (i)
the Company engages in a merger or other business combination transaction in
which the Company is not the surviving corporation, (ii) the Company engages in
a merger or other business combination transaction in which the Company is the
surviving corporation and the Common Stock of the Company is changed or
exchanged or (iii) 50% or more of the Company's assets, cash flow or earning
power is sold or transferred, each holder of a Right (except Rights which
previously have been voided as set forth above) shall thereafter have the 


                                       3
<PAGE>
 
right to receive, upon exercise, common stock of the acquiring company having a
value equal to two times the exercise price of the Right. The events set forth
in this paragraph and in the second preceding paragraph are referred to as the
"Triggering Events."

     The Purchase Price payable, and the number of shares of Common Stock or
other securities or property issuable, upon exercise of the Rights are subject
to adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Common
Stock, (ii) if holders of the Common Stock are granted certain rights or
warrants to subscribe for Common Stock or convertible securities at less than
the current market price of the Common Stock or (iii) upon the distribution to
holders of the Common Stock of evidences of indebtedness or assets (excluding
regular quarterly cash dividends) or of subscription rights or warrants (other
than those referred to above).

     With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments amount to at least 1% of the Purchase
Price.  No fractional shares will be issued and, in lieu thereof, an adjustment
in cash will be made based on the market price of the Common Stock on the last
trading date prior to the date of exercise.

     In general, at any time until ten business days following the Stock
Acquisition Date, the Company may redeem the Rights in whole, but not in part,
at a price of $.01 per Right (payable in cash, Common Stock or other
consideration deemed appropriate by the Board of Directors).  Under certain
circumstances set forth in the Rights Agreement, the decision to redeem shall
require the concurrence of a majority of the Continuing Directors.  Immediately
upon the action of the Board of Directors ordering redemption of the Rights,
with, where required, the concurrence of the Continuing Directors, the Rights
will terminate and the only right of the holders of Rights will be to receive
the $.01 redemption price.  The foregoing notwithstanding, the Rights generally
may not be redeemed for one hundred eighty (180) days following a change in a
majority of the Board of Directors as a result of a proxy contest.


                                       4
<PAGE>
 
     The term "Continuing Directors" means any member of the Board of Directors
of the Company who was a member of the Board prior to the date of the Rights
Agreement, and any person who is subsequently elected to the Board if such
person is recommended or approved by a majority of the Continuing Directors, but
shall not include an Acquiring Person, or an affiliate or associate of an
Acquiring Person, or any representative of the foregoing entities.

     Until a Right is exercised, the holder thereof, as such, will have no
rights as a shareholder of the Company, including, without limitation, the right
to vote or to receive dividends.  While the distribution of the Rights will not
be taxable to shareholders or to the Company, shareholders may, depending upon
the circumstances, recognize taxable income in the event that the Rights become
exercisable for Common Stock (or other consideration) of the Company or for
common stock of the acquiring company or in the event of the redemption of the
Rights as set forth above.

     Prior to the Distribution Date, any of the provisions of the Rights
Agreement may be amended by the Board of Directors of the Company, including
without limitation, to substitute whole or fractional shares of preferred stock
or Common Stock for which the Rights may be exercised.  After the Distribution
Date, the provisions of the Rights Agreement may be amended by the Board (in
certain circumstances, with the concurrence of the Continuing Directors) in
order to cure any ambiguity, to correct or supplement any defective or
inconsistent provision, to make changes which do not adversely affect the
interests of holders of Rights (excluding the interests of any Acquiring Person,
Adverse Person, or Affiliate or Associate of any such Person), or to shorten or
lengthen any time period under the Rights Agreement; provided, however, that no
                                                     --------  -------         
amendment may be made at such time as the Rights are not redeemable.


     A copy of the Rights Agreement is being filed with the Securities and
Exchange Commission as an Exhibit to a Registration Statement on Form 8-
A/Current Report on Form 8-K.  A copy of the Rights Agreement is available free
of charge from the Company.  This summary description of the Rights does not
purport to be complete and is qualified 


                                       5
<PAGE>
 
in its entirety by reference to the Rights Agreement, which is incorporated
herein by reference.


                                       6

<PAGE>
 
                                                                    EXHIBIT 99.1

                 [ATMOS ENERGY CORPORATION LOGO APPEARS HERE]


                                 NEWS RELEASE

DATE:  November 12, 1997                          ATMOS MEDIA CONTACT:
                                                  Margaret Watson
                                                  972-855-4050


FOR RELEASE:  IMMEDIATELY                         ATMOS INVESTOR/
                                                  ANALYST CONTACT:
                                                  LYNN HORD
                                                  972-855-3729


                           ATMOS ENERGY CORPORATION
                      ADOPTS NEW SHAREHOLDER RIGHTS PLAN

    Dallas, Texas -- Atmos Energy Corporation (NYSE-ATO) announced today that
its Board of Directors has adopted a new shareholder rights plan under which new
rights will be issued following the expiration of its existing shareholder
rights plan. The existing plan was adopted in 1988 and expires on May 10, 1998.
As is true with the existing plan, the newly-adopted rights plan is designed to
deter coercive takeover tactics and to prevent a person or group from gaining
control of Atmos Energy Corporation without offering a fair price to all of its
shareholders. The new plan, which will take effect upon the expiration of the
existing plan, was not adopted in response to any offer to acquire control of
the company, and the Board is not aware of any such effort.

    The newly-adopted rights plan will result in the distribution to
shareholders of one right for each share of common stock held as of May 10,
1998. Upon the occurrence of one of the "triggering events" described below,
each right exercised will entitle a shareholder (other than certain shareholders
discussed below) to buy shares of common stock or other assets of the Company
having a value equal to twice the exercise price of $80 per right. The rights to
be issued under the newly-adopted plan will expire on May 10, 2008, unless
extended prior thereto by the Board of Directors or earlier if redeemed by the
company.

    The right to purchase common stock under the newly-adopted plan can be
exercised only if a person or group acquires 15 percent or more of the company's
common stock, announces a tender or exchange offer which, if successfully
completed, would give that person or group ownership of 15 percent or more of
the company's common stock, or the Board of Directors determines that a 10
percent-or-more holder is an "adverse person," as defined in the rights plan.
<PAGE>
 
    Under the rights plan's "flip-in" feature, if a person or group acquires 15
percent or more of the company's common stock (except pursuant to a tender or
exchange offer for all outstanding shares on terms approved by members of the
Board of Directors of the company not associated with the acquirer), or if such
person or group is determined by the Board of Directors to be an "adverse
person," holders of the rights (other than such 15 percent shareholder or an
"adverse person") would be entitled to purchase common stock, or in certain
circumstances, other assets of the company, having a value of twice the right's
exercise price.

    In addition, if the company were to merge with another entity and the
company were not the surviving corporation, or if the company were to sell 50
percent or more of its assets, cash flow or earning power to any other person,
each right would entitle its owner to purchase common stock of the acquiring
corporation having a value of twice the right's exercise price.

    The Board of Directors of the company (with, in certain circumstances, the
concurrence of those directors not associated with a 15 percent-or-more holder)
may generally redeem the rights any time until 10 business days after an
announcement that a person or group has acquired 15 percent or more of the
company's common stock. The Board (with, in certain circumstances, the
concurrence of those directors not associated with a 15 percent-or-more holder)
may also extend the 10 business day period during which the company may redeem
the rights. In addition, the rights may also be redeemed in connection with
certain transactions approved by the directors of the company.

    The Board said it adopted the new shareholder rights plan with confidence in
Atmos Energy Corporation's future and with determination that shareholders be
given every opportunity to participate fully in that future.

    Atmos Energy Corporation provides natural gas and propane to more than 1
million customers in 13 states through its operating divisions - Energas
Company, Greeley Gas Company, Trans Louisiana Gas Company, United Cities Gas
Company, Western Kentucky Gas Company, and United Cities Propane Gas.


                                    *  *  *


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