AMEREN CORP
8-K, 1998-10-14
ELECTRIC & OTHER SERVICES COMBINED
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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):  October 9, 1998



                               AMEREN CORPORATION
- -------------------------------------------------------------------------------
               (Exact name of registrant as specified in charter)




                                    Missouri
- -------------------------------------------------------------------------------
                           State or other jurisdiction
                                of incorporation)



      1-14756                                                    43-1723446
      -------                                                    ----------
(Commission File No.)                                           (IRS employer
                                                             identification no.)



1901 Chouteau Avenue, St. Louis, Missouri                            63103
- --------------------------------------------------------------------------------
(Address of principal executive offices)                           (Zip Code)



Registrant's telephone number, including area code (314) 621-3222
                                                   --------------


<PAGE>


                    INFORMATION TO BE INCLUDED IN THE REPORT

Item 5.  Other Events.

Introduction
- ------------

                  On  October  9,  1998,   the  Board  of  Directors  of  Ameren
Corporation (the "Company")  declared a dividend of one preferred share purchase
right (a "Right") for each outstanding share of common stock, par value $.01 per
share,  of the Company  (the  "Common  Shares").  The dividend is payable on the
tenth day following  approval by the Securities  and Exchange  Commission of the
issuance of the Rights under the Public Utility  Holding Company Act of 1935, as
amended (such date,  the "Record  Date") to the  stockholders  of record on that
date. The description and terms of the Rights are set forth in an Agreement (the
"Agreement") between the Company and First Chicago Trust Company of New York, as
Rights Agent (the "Rights Agent").

Purchase Price
- --------------

                  Each Right entitles the registered holder to purchase from the
Company one one-hundredth of a share of Series A Junior Participating  Preferred
Stock of the Company,  par value $.01 per share (the "Preferred  Shares"),  at a
price of $180 per one one-hundredth of a Preferred Share (the "Purchase Price"),
subject to adjustment.

Flip-In
- -------

                  In the  event  that  any  person  or group  of  affiliated  or
associated  persons  acquires  beneficial  ownership  of  15%  or  more  of  the
outstanding Common Shares (an "Acquiring Person"), each holder of a Right, other
than Rights beneficially owned by the Acquiring Person (which will thereafter be
void),  will  thereafter  have the right to receive upon exercise that number of
Common  Shares  having a market  value of two  times the  exercise  price of the
Right.

Flip-Over
- ---------

                  If the  Company  is  acquired  in a merger  or other  business
combination  transaction  or 50% or more of its  consolidated  assets or earning
power are sold  after a person or group has  become an  Acquiring  Person,  each
holder of a Right (other than Rights  beneficially  owned by  Acquiring  Person,
which will be void) will  thereafter  have the right to receive  that  number of
shares  of  common  stock  of the  acquiring  company  which at the time of such
transaction  will have a market  value of two times  the  exercise  price of the
Right.

                                      -1-

<PAGE>

Distribution Date
- -----------------

                  The distribution date is the earlier of

                  (i) 10 days following a public  announcement  that a person or
group of affiliated or associated persons have acquired beneficial  ownership of
15% or more of the outstanding Common Shares; or

                  (ii) 10 business days (or such later date as may be determined
by action of the Board of  Directors  of the  Company  prior to such time as any
person or group of affiliated persons becomes an Acquiring Person) following the
commencement  of, or  announcement  of an  intention  to make, a tender offer or
exchange  offer  the  consummation  of  which  would  result  in the  beneficial
ownership by a person or group of 15% or more of the outstanding Common Shares.

Transfer and Detachment
- -----------------------

                  Until the  Distribution  Date,  the Rights will be  evidenced,
with  respect  to any of the Common  Share  certificates  outstanding  as of the
Record  Date,  by such Common Share  certificate  with a copy of this Summary of
Rights attached thereto.  Until the Distribution Date (or earlier  redemption or
expiration of the Rights), the Rights will be transferred with and only with the
Common Shares, and transfer of those certificates will also constitute  transfer
of these Rights.

                  As  soon  as  practicable  following  the  Distribution  Date,
separate  certificates  evidencing  the Rights  ("Right  Certificates")  will be
mailed to holders of record of the Common  Shares as of the close of business on
the Distribution Date and such separate Right Certificates alone will thereafter
evidence the Rights.

Exercisability
- --------------
                  The Rights are not exercisable  until the  Distribution  Date.
The Rights will expire on October 9, 2008 (the "Final Expiration Date"),  unless
the Final  Expiration Date is extended or unless the Rights are earlier redeemed
or exchanged by the Company, in each case, as described below.

Adjustments
- -----------
                  The Purchase Price payable, and the number of Preferred Shares
or other  securities  or  property  issuable,  upon  exercise  of the Rights are
subject  to  adjustment  from time to time to prevent  dilution  in the event of
stock dividends, stock splits, reclassifications,  or certain distributions with
respect to the Preferred Shares. The number of outstanding Rights and the number
of one  one-hundredths of a Preferred Share issuable upon exercise of each Right
are also subject to adjustment if, prior to the  Distribution  Date,  there is a
stock  split of the  Common  Shares or a stock  dividend  on the  Common  Shares
payable in Common Shares or subdivisions,  consolidations or combinations of the
Common Shares. With certain exceptions, no adjustment in the Purchase Price will
be required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price. No fractional  Preferred  Shares will be issued (other than
fractions which

                                      -2-
<PAGE>

are integral multiples of one one-hundredth of a Preferred Share,  which may, at
the  election of the Company, be evidenced by  depositary receipts) and, in lieu
thereof,  an  adjustment in  cash will be made based on the  market price of the
Preferred Shares on the last trading day prior to the date of exercise.

Preferred Shares
- ----------------

                  Preferred Shares  purchasable upon exercise of the Rights will
not  be  redeemable.  Each  Preferred  Share  will  be  entitled  to  a  minimum
preferential  quarterly dividend payment of $1 per share but will be entitled to
an aggregate  dividend of 100 times the dividend  declared per Common Share.  In
the event of liquidation,  the holders of the Preferred  Shares will be entitled
to a  minimum  preferential  liquidation  payment  of $100 per share but will be
entitled to an aggregate payment of 100 times the payment made per Common Share.
Each  Preferred  Share  will have 100  votes,  voting  together  with the Common
Shares. Finally, in the event of any merger,  consolidation or other transaction
in which Common Shares are exchanged,  each Preferred  Share will be entitled to
receive  100 times the  amount  received  per  Common  Share.  These  rights are
protected by customary antidilution provisions.

                  The value of the one  one-hundredth  interest  in a  Preferred
Share  purchasable upon exercise of each Right should,  because of the nature of
the Preferred Shares' dividend,  liquidation and voting rights,  approximate the
value of one Common Share.

Exchange
- --------

                  At any time  after any person or group  becomes  an  Acquiring
Person,  and prior to the  acquisition by such person or group of 50% or more of
the  outstanding  Common  Shares,  the Board of  Directors  of the  Company  may
exchange the Rights (other than Rights owned by the Acquiring Person, which will
have  become  void),  in whole or in part,  at an  exchange  ratio of one Common
Share, or one one-hundredth of a Preferred Share (subject to adjustment).

Redemption
- ----------

                  At any time prior to any person or group becoming an Acquiring
Person,  the Board of  Directors  of the Company may redeem the Rights in whole,
but not in part,  at a price of $.01 per Right  (the  "Redemption  Price").  The
redemption  of the Rights may be made  effective at such time on such basis with
such  conditions as the Board of Directors in its sole discretion may establish.
Immediately upon any redemption of the Rights,  the right to exercise the Rights
will  terminate  and the only right of the  holders of Rights will be to receive
the Redemption Price.

Amendments
- ----------

                  The  terms  of the  Rights  may be  amended  by the  Board  of
Directors  of the  Company  without  the  consent of the  holders of the Rights,
including an amendment to lower certain  thresholds  described above to not less
than the  greater  of (i) the sum of .001%  and the  largest  percentage  of the
outstanding  Common Shares then known to the Company to be beneficially owned by
any person or group of  affiliated or  associated  persons and (ii) 10%,  except
that from
                                      -3-
<PAGE>

and after such time as any  person or group  of affiliated or associated persons
becomes an Acquiring Person no such amendment may adversely affect the interests
of the holders of the Rights.

Rights and Holders
- ------------------

                  Until a Right is exercised,  the holder thereof, as such, will
have no rights as a stockholder of the Company,  including,  without limitation,
the right to vote or to receive dividends.

Further Information
- -------------------

                  A copy of the Agreement  and the related press release  issued
by the  Company on October 9, 1998 are filed as Exhibits 4 and 99 hereto and are
incorporated  herein by reference.  The  foregoing  summary  description  of the
Rights does not  purport to be  complete  and is  qualified  in its  entirety by
reference to the Agreement.

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.
                               --- -----

                  (c)      Exhibits

                           4        Agreement,  dated  as of  October  9,  1998,
                                    between Ameren Corporation and First Chicago
                                    Trust  Company of New York, as Rights Agent,
                                    which  includes the form of  Certificate  of
                                    Designation  of  the  Preferred   Shares  as
                                    Exhibit A, the form of Right  Certificate as
                                    Exhibit  B and  the  Summary  of  Rights  as
                                    Exhibit C.

                           99       Press Release  dated October 9, 1998, issued
                                    by Ameren Corporation.



                                      -4-

<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 thereunto duly authorized.

                                                   AMEREN CORPORATION



                                       By:   /S/  Steven R. Sullivan
                                           ----------------------------------
                                      Name: Steven R. Sullivan
                                     Title: Vice President, General Counsel
                                                  and Secretary




Dated:  October 14, 1998


                                      -5-

<PAGE>


                                  EXHIBIT INDEX

Exhibit                                                           
  No.                              Description                    
- -------                            -----------                    

  4               Agreement, dated as of October 9, 1998,
                  between  Ameren  Corporation  and First
                  Chicago  Trust Company of  New York, as
                  Rights Agent, which includes  the  form
                  of  Certificate  of  Designation of the
                  Preferred Shares as Exhibit A, the form
                  of Right  Certificate  as Exhibit B and
                  the  Summary of Rights as Exhibit C.

  99              Press  Release  dated  October 9,  1998,
                  issued  by Ameren Corporation.




_____________________________


                                      -6-












_______________________________________________________________________________


                               AMEREN CORPORATION

                                       and

                           First Chicago Trust Company

                                  of New York

                                  Rights Agent

                                    Agreement

                           Dated as of October 9, 1998



_______________________________________________________________________________




<PAGE>

<TABLE>
<CAPTION>


                                  
                                TABLE OF CONTENTS
                                -----------------
                                                                                   Page
                                                                                  Number
                                                                                  ------
<S>           <C>                                                                  <C>

Section 1.     Definitions.......................................................    1

Section 2.     Appointment of Rights Agent.......................................    6

Section 3.     Issue of Right Certificates.......................................    7

Section 4.     Form of Right Certificates........................................    9

Section 5.     Countersignature and Registration.................................   10

Section 6.     Transfer, Split Up, Combination and Exchange of Right
               Certificates; Mutilated, Destroyed, Lost or Stolen Right
               Certificates......................................................   11

Section 7.     Exercise of Rights; Purchase Price; Expiration Date of Rights.....   12

Section 8.     Cancellation and Destruction of Right Certificates................   14

Section 9.     Availability of Preferred Shares..................................   14

Section 10.    Preferred Shares Record Date......................................   15

Section 11.    Adjustment of Purchase Price, Number of Shares or Number of
               Rights............................................................   16

Section 12.    Certificate of Adjusted Purchase Price or Number of Shares........   27

Section 13.    Consolidation, Merger or Sale or Transfer of Assets or Earning
               Power.............................................................   27

Section 14.    Fractional Rights and Fractional Shares...........................   29

Section 15.    Rights of Action..................................................   31

Section 16.    Agreement of Right Holders........................................   31

Section 17.    Right Certificate Holder Not Deemed a Stockholder.................   32

Section 18.    Concerning the Rights Agent.......................................   33

Section 19.    Merger or Consolidation or Change of Name of Rights Agent.........   33

                                      -i-

<PAGE>

Section 20.    Duties of Rights Agent............................................   34

Section 21.    Change of Rights Agent............................................   37

Section 22.    Issuance of New Right Certificates................................   39

Section 23.    Redemption........................................................   39

Section 24.    Exchange..........................................................   40

Section 25.    Notice of Certain Events..........................................   42

Section 26.    Notices...........................................................   44

Section 27.    Supplements and Amendments........................................   45

Section 28.    Successors........................................................   45

Section 29.    Benefits of this Agreement........................................   45

Section 30.    Severability......................................................   46

Section 31.    Governing Law.....................................................   46

Section 32.    Counterparts......................................................   46

Section 33.    Descriptive Headings..............................................   46

Signatures.......................................................................   47

</TABLE>


Exhibit A      -      Form of Certificate of Designations

Exhibit B      -      Form of Right Certificate

Exhibit C      -      Summary of Rights to Purchase Preferred Shares


                                      -ii-

<PAGE>



   
     Agreement,  dated  as  of  October  9,  1998,  between  Ameren Corporation,
a Missouri  corporation (the  "Company"), and First Chicago Trust Company of New
York, as rights agent (the "Rights Agent").

     The Board  of  Directors  of  the Company  has  authorized  and  declared a
dividend of one preferred share purchase right (a "Right") for each Common Share
(as  hereinafter defined) of the Company  outstanding on the tenth day following
(and subject to) approval  by  the  Securities  and  Exchange Commission  of the
issuance of the Rights (the  "Record  Date"), each Right representing  the right
to purchase one  one-hundredth  of  a Preferred Share (as hereinafter  defined),
upon the terms and subject to the conditions  herein set forth,  and has further
authorized  and directed  the issuance of one Right with  respect to each Common
Share that shall become outstanding  between the Record Date and the earliest of
the  Distribution  Date,  the Redemption  Date and the Final Expiration Date (as
such terms are hereinafter defined).

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

     Section 1.     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 Common  Shares of the  Company  then  outstanding,  but shall
not  include the Company, any Subsidiary  of the Company, any  employee  benefit
plan of the Company or any  Subsidiary  of the  Company,  or any entity  holding
Common Shares for or pursuant  to the  terms of any such  plan.

                                      -1-

<PAGE>

Notwithstanding the foregoing, no  Person shall become an "Acquiring  Person" as
the result of an acquisition of Common Shares by the Company  which, by reducing
the  number  of  Common  Shares  of  the  Company   outstanding,  increases  th
proportionate number of Common Shares of the Company beneficially  owned by such
Person to  15% or more of the  Common Shares  of the Company  then  outstanding;
provided, however, that, if a Person shall become the Beneficial Owner of 15% or
more of the Common Shares of the Company  then  outstanding  by  reason of share
purchases by the Company and shall, after such share  purchases  by the Company,
become the Beneficial Owner of any additional Common Shares of the Company, then
such Person shall be deemed to be an  "Acquiring  Person."  Notwithstanding  the
foregoing, if the Board of Directors of the  Company  determines  in good  faith
that a Person who would otherwise be an "Acquiring Person," as defined  pursuant
to  the  foregoing  provisions   of  this   paragraph  (a),  has   become   such
inadvertently, and such Person divests as promptly as  practicable  a sufficient
number  of  Common Shares  so that  such Person would no longer be an "Acquiring
Person," as defined pursuant to the  foregoing provisions of this paragraph (a),
then  such  Person  shall  not be  deemed  to  be an "Acquiring Person" for  any
purposes of this Agreement.

     (b)  "Affiliate" shall have the meaning ascribed to such term in Rule 12b-2
of the General Rules and Regulations under the  Exchange Act as in effect on the
date of this Agreement.

     (c)  "Associate" shall have the meaning ascribed to such term in Rule 12b-2
of the General Rules and Regulations  under the Exchange Act as in effect on the
date of this  Agreement.

                                     -2-

<PAGE>

     (d) 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 beneficially owns, directly or indirectly;

                  (ii) which such Person or any of such  Person's  Affiliates or
         Associates  has (A)  the  right  to  acquire  (whether  such  right  is
         exercisable  immediately or only after the passage of time) pursuant to
         any  agreement,  arrangement  or  understanding  (other than  customary
         agreements with and between underwriters and selling group members with
         respect to a bona fide  public  offering  of  securities),  or upon the
         exercise of  conversion  rights,  exchange  rights,  rights (other than
         these Rights),  warrants or options, or otherwise;  provided,  however,
         that a Person  shall  not be  deemed  the  Beneficial  Owner  of, or to
         beneficially own,  securities tendered pursuant to a tender or exchange
         offer  made by or on  behalf  of such  Person  or any of such  Person's
         Affiliates or Associates  until such tendered  securities  are accepted
         for  purchase  or  exchange;  or (B) the right to vote  pursuant to any
         agreement,  arrangement or  understanding;  provided,  however,  that a
         Person shall not be deemed the Beneficial  Owner of, or to beneficially
         own, any security if the  agreement,  arrangement or  understanding  to
         vote such security (1) arises solely from a revocable  proxy or consent
         given  to  such  Person  in  response  to a  public  proxy  or  consent
         solicitation  made pursuant to, and in accordance  with, the applicable
         rules and regulations promulgated under the Exchange Act and (2) is not
         also then  reportable  on Schedule  13D under the  Exchange Act (or any
         comparable or successor report); or

                                      -3-

<PAGE>

                  (iii) which are beneficially owned, directly or indirectly, by
         any  other  Person  with  which  such  Person  or any of such  Person's
         Affiliates   or   Associates   has  any   agreement,   arrangement   or
         understanding   (other  than  customary  agreements  with  and  between
         underwriters  and selling  group  members  with  respect to a bona fide
         public offering of securities)  for the purpose of acquiring,  holding,
         voting  (except to the extent  contemplated  by the  proviso to Section
         1(c)(ii)(B) hereof) or disposing of any securities of the Company.

     Notwithstanding anything in this definition of Beneficial Ownership  to the
contrary, the phrase "then outstanding," when  used with reference to a Person's
Beneficial Ownership of securities of the Company, shall mean the number of such
securities  then  issued  and  outstanding  together  with  the  number  of such
securities not then actually  issued and  outstanding which such Person would be
deemed to own beneficially hereunder.

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

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

     (g) "Common Shares" when used with reference to the Company shall  mean the
shares  of common stock,  par  value $.01 per  share,  of the  Company.  "Common
Shares" when used with reference to any Person other than the Company shall mean
the capital stock (or equity

                                      -4-

<PAGE>

interest) with the greatest voting  power of such other Person or, if such other
Person is a Subsidiary of another Person, the Person or Persons which ultimately
control such first-mentioned Person.

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

     (i) "Exchange Act"  shall  mean  the  Securities  Exchange Act of  1934, as
amended.

     (j) "Exchange Ratio"  shall  have  the meaning  set  forth in Section 24(a)
hereof.

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

     (l) "NASDAQ" shall mean the National Association of Securities Dealers, Inc
Automated Quotation System.

     (m) "Person"  shall mean any individual, firm, corporation or other entity,
and shall  include any  successor  (by merger or otherwise) of such entity.

     (n) "Preferred Shares" shall mean  shares of Series A Junior  Participating
Preferred Stock, par value $.01 per share, of the Company having the  rights and
preferences set forth in the Form of Certificate of Designation, Preferences and
Rights attached to this Agreement as Exhibit A.

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

                                      -5-

<PAGE>

     (p) "Record Date" shall have the meaning set forth in the second  paragraph
hereof.

     (q) "Redemption  Date"  shall have the  meaning  set forth  in Section 7(a)
hereof.
     
     (r) "Redemption Price"  shall have  the meaning set  forth in Section 23(a)
hereof.

     (s) "Right"  shall  have  the  meaning set  forth  in the  second paragraph
hereof.

     (t) "Right Certificate"  shall have the meaning  set forth  in Section 3(a)
hereof.

     (u) "Shares  Acquisition  Date"   shall  mean  the  first  date  of  public
announcement by the Company or an Acquiring Person that an  Acquiring Person has
become such.

     (v) "Subsidiary"  of any Person  shall mean any corporation or other entity
of which a  majority of the  voting  power of the  voting  equity  securities or
equity interest is owned, directly or indirectly,  by such Person.

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

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

     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

                                      -6-

<PAGE>

Shares of the Company) in accordance with  the terms and conditions  hereof, and
the Rights Agent hereby accepts such appointment. The  Company may  from time to
time appoint such co-Rights Agents as it may deem necessary or desirable.

     Section 3. Issue of Right  Certificates.   (a) Until the earlier of (i) the
tenth day after the Shares  Acquisition  Date or (ii) the tenth Business Day (or
such later date as may be determined  by action of the Board of Directors of the
Company prior to such time as any Person becomes an Acquiring  Person) after the
date of the  commencement 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 entity  holding  Common Shares of the Company for or pursuant
to the terms of any such plan) of, or of the first  public  announcement  of the
intention of 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 entity  holding Common Shares of the Company for or pursuant to the terms of
any such plan) to commence, a tender or exchange offer the consummation of which
would result in any Person becoming the Beneficial Owner of Common Shares of the
Company  aggregating  15% or more of the then  outstanding  Common Shares of the
Company  (including  any such date which is after the date of this Agreement and
prior to the  issuance  of the Rights;  the  earlier of such dates being  herein
referred  to as the  "Distribution  Date"),  (x) the  Rights  will be  evidenced
(subject to the  provisions  of Section  3(b)  hereof) by the  certificates  for
Common  Shares of the Company  registered  in the names of the  holders  thereof
(which  certificates  shall also be deemed to be Right  Certificates) and not by
separate  Right  Certificates,  and (y) the right to receive Right  Certificates
will be  transferable  only in connection  with the transfer of Common Shares of
the Company.  As soon as practicable  after

                                      -7-

<PAGE>

the  Distribution  Date, the Company will prepare and execute, the Rights  Agent
will countersign,  and the Company will send or cause to be sent (and the Rights
Agent will, if requested, send) by first-class, insured,  postage-prepaid  mail,
to  each record   holder of  Common Shares  of the  Company as  of the  Close of
Business on the  Distribution  Date, at the  address  of such  holder  shown  on
the records of the Company, a Right Certificate, in substantially  the  form  of
Exhibit B hereto (a  "Right Certificate"), evidencing  one Right for each Common
Share so held.  As of the Distribution   Date,  the  Rights  will  be  evidenced
solely by such Right Certificates.

     (b) On the Record Date, or as soon as practicable  thereafter,  the Company
will  send a  copy  of a  Summary of Rights  to  Purchase  Preferred  Shares, in
substantially  the form of  Exhibit  C hereto  (the  "Summary  of  Rights"),  by
first-class,  postage-prepaid mail, to each record holder of Common Shares as of
the Close of Business on the Record Date, at the address of such holder shown on
the records of the Company.  With respect to  certificates  for Common Shares of
the Company  outstanding as of the Record Date, until the Distribution Date, the
Rights will be evidenced  by such  certificates  registered  in the names of the
holders thereof together with a copy of the Summary of Rights attached  thereto.
Until the Distribution  Date (or the earlier of the Redemption Date or the Final
Expiration  Date),  the  surrender  for transfer of any  certificate  for Common
Shares of the Company  outstanding on the Record Date, with or without a copy of
the Summary of Rights  attached  thereto,  shall also constitute the transfer of
the Rights associated with the Common Shares of the Company represented thereby.

     (c) Certificates for Common Shares  which  become  outstanding  (including,
without limitation,  reacquired  Common Shares  referred to in the last sentence
of this paragraph (c)) after  the Record  Date  but prior to the earliest of the
Distribution  Date, the Redemption Date

                                      -8-

<PAGE>

or the Final  Expiration Date shall have impressed on, printed on, written on or
otherwise affixed to them the following legend:

         This  certificate  also  evidences  and entitles  the holder  hereof to
         certain rights as set forth in an Agreement between Ameren  Corporation
         and First Chicago Trust Company of New York, as Rights Agent,  dated as
         of  October  9,  1998,  as it may be  amended  from  time to time  (the
         "Agreement"),  the terms of which  are  hereby  incorporated  herein by
         reference  and a copy of  which is on file at the  principal  executive
         offices of Ameren  Corporation.  Under  certain  circumstances,  as set
         forth in the Agreement,  such Rights (as defined in the Agreement) will
         be evidenced by separate  certificates  and will no longer be evidenced
         by this certificate. Ameren Corporation will mail to the holder of this
         certificate a copy of the Agreement  without  charge after receipt of a
         written  request  therefor.  As  set  forth  in the  Agreement,  Rights
         beneficially  owned by any Person (as  defined  in the  Agreement)  who
         becomes an Acquiring  Person (as defined in the Agreement)  become null
         and void.

With respect to such  certificates  containing the foregoing  legend,  until the
Distribution  Date, the Rights  associated with the Common Shares of the Company
represented by such certificates shall be evidenced by such certificates  alone,
and the surrender for transfer of any such certificate shall also constitute the
transfer  of the  Rights  associated  with  the  Common  Shares  of the  Company
represented  thereby.  In the event that the Company  purchases  or acquires any
Common Shares of the Company after the Record Date but prior to the Distribution
Date,  any Rights  associated  with such Common  Shares of the Company  shall be
deemed  cancelled  and  retired so that the  Company  shall not be  entitled  to
exercise any Rights  associated  with the Common Shares of the Company which are
no longer outstanding.

     Section 4.  Form of Right Certificates.   The  Right  Certificates (and the
forms of election to purchase Preferred Shares and  of assignment  to be printed
on the reverse thereof) shall be substantially the same as Exhibit B 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

                                      -9-
<PAGE>

require  to  comply  with  any  applicable law or  with any  applicable  rule or
regulation  made  pursuant thereto or  with any applicable rule or regulation of
any stock  exchange or the  National Association of Securities Dealers, Inc., or
to conform to usage.  Subject to the  provisions of Section 22 hereof, the Right
Certificates  shall entitle the holders  thereof  to purchase such number of one
one-hundredths  of a  Preferred Share as shall be set forth therein at the price
per  one one-hundredth  of a  Preferred Share set  forth  therein (the "Purchase
Price"), but the number of such one one-hundredths of a Preferred  Share and the
Purchase Price shall be subject to adjustment as provided herein.

     Section 5.  Countersignature and Registration. The Right Certificates shall
be executed on behalf of the Company  by its Chairman  of the  Board,  its Chief
Executive Officer,  its President,  any of its Vice Presidents or its Treasurer,
either  manually  or by  facsimile  signature,  shall have  affixed  thereto the
Company's seal or a facsimile thereof, and shall be attested by the Secretary or
an  Assistant  Secretary  of  the  Company,  either  manually  or  by  facsimile
signature.  The Right Certificates shall be manually countersigned by the Rights
Agent and shall not be valid for any purpose unless  countersigned.  In case any
officer of the Company who shall have signed any of the Right Certificates shall
cease to be such officer of the Company  before  countersignature  by the Rights
Agent and  issuance  and  delivery  by the  Company,  such  Right  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  individual  who
signed such Right Certificates had not ceased to be such officer of the Company;
and any  Right  Certificate  may be  signed  on  behalf  of the  Company  by any
individual  who, at the actual date of the execution of such Right  Certificate,
shall be a  proper  officer  of the  Company  to sign  such  Right  Certificate,
al-


                                      -10-

<PAGE>

though at the  date of the  execution of this Agreement any such  individual was
not such an officer.

     Following the Distribution Date, the Rights Agent will  keep or cause to be
kept, at its principal office,  books for registration and transfer of the Right
Certificates issued hereunder.  Such books shall show the names and addresses of
the respective holders of the Right Certificates, the number of Rights evidenced
on its face by each of the Right  Certificates and the date of each of the Right
Certificates.

     Section 6.   Transfer,   Split  Up,  Combination   and  Exchange  of  Right
Certificates; Mutilated,  Destroyed, Lost or Stolen Right Certificates.  Subject
to the provisions of 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
earlier  of  the  Redemption  Date  or  the  Final  Expiration  Date,  any Right
Certificate or  Right Certificates (other than Right  Certificates  representing
Rights that  have become  void pursuant to Section 11(a)(ii) hereof or that have
been exchanged  pursuant  to Section 24 hereof) may  be  transferred,  split up,
combined  or  exchanged  for  another  Right Certificate or  Right  Certificates
entitling the registered holder to purchase a like number of one  one-hundredths
of a Preferred  Share as the Right Certificate or Right Certificates surrendered
then  entitled  such holder  to purchase.  Any  registered  holder  desiring  to
transfer,  split  up,  combine  or  exchange  any  Right  Certificate  or  Right
Certificates shall make such  request in writing  delivered to the Rights Agent,
and  shall  surrender  the   Right  Certificate  or  Right  Certificates  to  be
transferred,  split up, combined or exchanged  at the principal  office  of  the
Rights  Agent.  Thereupon  the  Rights  Agent  shall countersign  and deliver to
the Person entitled  thereto a Right  Certificate or Right Certificates, as  the
case  may  be,  as  so  requested.  The  Company  may  require  pay-

                                      -11-

<PAGE>

ment 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 Right Certificates.

     Upon  receipt by the Company and  the  Rights  Agent of evidence reasonably
satisfactory  to them  of the loss, theft,  destruction or mutilation of a Right
Certificate,  and,  in  case  of  loss,  theft  or  destruction, of indemnity or
security  reasonably  satisfactory  to  them,  and,  at the  Company's  request,
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 Right  Certificate  if  mutilated,  the Company  will make and deliver a new
Right  Certificate  of like  tenor  to the  Rights  Agent  for  delivery  to the
registered holder in lieu of the Right Certificate so lost, stolen, destroyed or
mutilated.

     Section 7. Exercise of Rights;  Purchase Price;  Expiration Date of Rights.
(a) The  registered  holder  of  any Right  Certificate may exercise  the Rights
evidenced thereby (except as otherwise provided herein), in whole or in part, at
any time after the Distribution Date, upon  surrender of the Right  Certificate,
with the form of election to purchase on the reverse side thereof duly executed,
to the Rights Agent at the principal office of the Rights Agent,  together  with
payment of the Purchase Price for each one one-hundredth of a Preferred Share as
to which the Rights are exercised,  at or prior to the earliest of (i) the Close
of Business on October 9, 2008 (the  "Final Expiration Date"),  (ii) the time at
which the Rights are redeemed as provided in Section 23 hereof (the  "Redemption
Date"),  or (iii) the time at which such  Rights are  exchanged  as  provided in
Section 24 hereof.

                                      -12-

<PAGE>

     (b) The  Purchase Price for each one one-hundredth  of  a  Preferred  Share
purchasable  pursuant  to the exercise  of a Right shall  initially be $180, and
shall be subject to adjustment  rom time to time as provided in Section 11 or 13
hereof, and shall be payable in lawful money of the United  States of America in
accordance with paragraph (c) below.

     (c) Upon receipt of a Right Certificate  representing  exercisable  Rights,
with the form of election to purchase duly executed, accompanied  by payment  of
the Purchase Price for the shares  to be purchased  and an  amount  equal to any
applicable  transfer  tax  required  to be paid  by the  holder  of  such  Right
Certificate in accordance  with Section 9 hereof by certified  check,  cashier's
check or money order payable to the order of the Company, the Rights Agent shall
thereupon  promptly (i) (A) requisition from any transfer agent of the Preferred
Shares  certificates  for the number of Preferred Shares to be purchased and the
Company hereby irrevocably authorizes any such transfer agent to comply with all
such requests,  or (B) requisition from the depositary agent depositary receipts
representing such number of one one-hundredths of a Preferred Share as are to be
purchased (in which case  certificates for the Preferred  Shares  represented by
such receipts shall be deposited by the transfer  agent of the Preferred  Shares
with such depositary agent) and the Company hereby directs such depositary agent
to comply with such request; (ii) when appropriate, requisition from the Company
the  amount  of cash to be paid in lieu of  issuance  of  fractional  shares  in
accordance  with  Section  14  hereof;  (iii)  promptly  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 Right Certificate, registered in such
name or names as may be  designated by such holder;  and (iv) when  appropriate,
after receipt, promptly deliver such cash to or upon the order of the registered
holder of such Right Certificate.

                                      -13-

<PAGE>

      (d) In case the registered holder of any Right Certificate  shall exercise
less than all the Rights  evidenced  thereby, a new Right Certificate evidencing
Rights equivalent to  the  Rights  remaining unexercised  shall be issued by the
Rights  Agent to registered holder of such Right Certificate or to such holder's
duly authorized  assigns,  subject to the provisions of Section 14 hereof.

     Section 8.  Cancellation and  Destruction of Right Certificates.  All Right
Certificates  surrendered  for  the  purpose  of exercise,  transfer,  split up,
combination or exchange shall, if  surrendered to the  Company or to  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 Right
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  Right  Certificate purchased or acquired by the
Company  otherwise  than upon  the  exercise  thereof.  The Rights  Agent  shall
deliver  all  cancelled  Right  Certificates  to  the  Company, or shall, at the
written request of the Company, destroy such cancelled Right Certificates,  and,
in such case, shall deliver a certificate of destruction thereof to the Company.

     Section 9.  Availability of Preferred  Shares.  The Company  covenants  and
agrees  that  it  will  cause  to  be  reserved  and  kept  available out of its
authorized and unissued  Preferred  Shares or any  Preferred  Shares held in its
treasury the number of Preferred  Shares that will be  sufficient  to permit the
exercise in full of all outstanding  Rights in accordance with Section 7 hereof.
The Company covenants  and agrees  that it will  take all such  action as may be
necessary  to ensure that all Preferred Shares delivered upon exercise of Rights
shall, at the time of delivery

                                      -14-

<PAGE>

of the  certificates  for such  Preferred  Shares (subject  to  payment  of  the
Purchase Price),  be duly and validly  authorized and  issued and fully paid and
nonassessable shares.

     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 Right  Certificates or of
any  Preferred  Shares  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 Right  Certificates  to a Person other than,  or the
issuance or delivery of  certificates  or depositary  receipts for the Preferred
Shares  in a name  other  than  that of,  the  registered  holder  of the  Right
Certificate evidencing Rights surrendered for exercise or to issue or to deliver
any  certificates or depositary  receipts for Preferred Shares upon the exercise
of any  Rights  until  any such tax  shall  have  been  paid (any such tax being
payable by the holder of such Right  Certificate  at the time of  surrender)  or
until it has been established to the Company's  reasonable  satisfaction that no
such tax is due.

     Section  10.  Preferred  Shares  Record  Date.   Each  Person in whose name
any certificate for Preferred Shares is issued upon the exercise of Rights shall
for all purposes be deemed to have become the  holder of record of the  referred
Shares  represented  thereby on, and such  certificate  shall be dated, the date
upon which the Right Certificate evidencing such Rights was duly surrendered and
payment of the  Purchase  Price (and any  applicable  transfer  taxes) was made;
provided,  however,  that,  if the date of such  surrender and payment is a date
upon which the Preferred  Shares transfer books of the Company are closed,  such
Person  shall be deemed to have become the record  holder of such shares on, and
such certificate  shall be dated, the next succeeding  Business Day on which the
Preferred  Shares transfer books of the Company are open.

                                      -15-

<PAGE>

Prior to  the exercise  of the Rights evidenced  thereby,  the holder of a Right
Certificate shall not be entitled  to any rights of a holder of Preferred Shares
for which the Rights shall be exercisable, including,  without  limitation,  the
right to vote,  to receive dividends or other  distributions or to  exercise any
preemptive  rights, 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 of  Shares or Number of
Rights. The Purchase Price, the number of Preferred 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  Preferred  Share  payable  in
Preferred Shares, (B) subdivide the outstanding Preferred  Shares,  (C)  combine
the outstanding  Preferred  Shares into a smaller number of Preferred  Shares or
(D) issue any shares of its capital stock in a reclassification of the Preferred
Shares (including any such  reclassification  in connection with a consolidation
or merger in which the  Company is the  continuing  or  surviving  corporation),
except as otherwise provided in this Section 11(a), 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 capital stock issuable on such date, shall be proportionately adjusted
so that the holder of any Right  exercised  after such time shall be entitled to
receive the aggregate  number and kind of shares of capital stock which, if such
Right had been exercised  immediately  prior to such date and at a time when the
Preferred Shares transfer books of the Company were open, such holder would have
owned  upon  such  exercise  and been  entitled  to  re-

                                      -16-

<PAGE>

ceive  by virtue of such dividend, subdivision, combination or reclassification;
provided, however, that  in no event shall the consideration to be paid upon the
exercise  of one Right  be less than the  aggregate par  value of  the shares of
capital stock of the Company issuable upon exercise of one Right.

     (ii)  Subject to  Section 24 hereof,  in the  event  any  Person becomes an
Acquiring  Person,  each holder  of  a  Right shall  thereafter  have a right to
receive,  upon  exercise  thereof at a price equal to the then current  Purchase
Price  multiplied by the number of one  one-hundredths  of a Preferred Share for
which  a Right  is then  exercisable,  in  accordance  with  the  terms  of this
Agreement and in lieu of Preferred  Shares,  such number of Common Shares of the
Company as shall equal the result  obtained by (A)  multiplying the then current
Purchase  Price by the number of one  one-hundredths  of a  Preferred  Share for
which a Right is then  exercisable  and dividing  that product by (B) 50% of the
then  current  per  share  market  price of the  Common  Shares  of the  Company
(determined  pursuant to Section 11(d) hereof) on the date of the  occurrence of
such event.  In the event that any Person shall  become an Acquiring  Person and
the Rights  shall then be  outstanding,  the  Company  shall not take any action
which would  eliminate or diminish  the benefits  intended to be afforded by the
Rights.

     From and after the  occurrence of such event,  any Rights  that are or were
acquired  or  beneficially  owned by any  Acquiring  Person (or any Associate or
Affiliate of such Acquiring Person) shall be void, and any holder of such Rights
shall thereafter have no right to  exercise such Rights  under  any provision of
this Agreement.  No Right  Certificate  shall  be  issued pursuant to  Section 3
hereof that represents Rights beneficially  owned by an  Acquiring Person  whose
Rights would be void  pursuant  to the  preceding  sentence or  any Associate or
Affiliate thereof; no

                                      -17-

<PAGE>

Right Certificate shall be issued at any time upon  the transfer  of  any Rights
to an  Acquiring  Person  whose  Rights  would be void pursuant to the preceding
sentence or  any  Associate or Affiliate  thereof  or to  any  nominee  of  such
Acquiring Person,  Associate or Affiliate;  and any Right Certificate  delivered
to the Rights Agent for transfer to an Acquiring  Person whose Rights  would  be
void pursuant to the preceding sentence shall be cancelled.

     (iii) In the event that there shall not be  sufficient Common Shares issued
but not outstanding or authorized but unissued to permit the exercise in full of
the Rights in accordance with  subparagraph  (ii) above,  the Company shall take
all such  action as may be necessary to authorize additional  Common  Shares for
issuance upon exercise of the Rights. In the event the Company shall, after good
faith effort, be unable to take all such action as may be necessary to authorize
such additional  Common Shares,  the Company shall  substitute,  for each Common
Share that would  otherwise be issuable  upon  exercise of a Right,  a number of
Preferred  Shares or fraction  thereof  such that the  current per share  market
price of one Preferred  Share  multiplied by such number or fraction is equal to
the  current  per  share  market  price  of one  Common  Share as of the date of
issuance of such Preferred Shares or fraction thereof.

     (b) In case the Company shall fix a record date for the issuance of rights,
options or warrants to all holders of  Preferred  Shares  entitling  them (for a
period expiring within 45 calendar days after such record date) to subscribe for
or purchase  Preferred Shares (or shares having the same rights,  privileges and
preferences  as  the  Preferred  Shares  ("equivalent   preferred  shares"))  or
securities convertible into Preferred Shares or equivalent preferred shares at a
price per Preferred Share or equivalent  preferred share (or having a conversion
price per share, if a security  convertible  into Preferred Shares or equivalent
preferred shares) less than the then current

                                      -18-

<PAGE>

per share  market price of the Preferred Shares (as defined in Section 11(d)) on
such  record date, 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
number of  Preferred  Shares outstanding  on such record date plus the number of
Preferred  Shares which the aggregate  offering  price  of the  total  number of
Preferred  Shares  and/or equivalent  preferred  shares 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  Preferred  Shares  outstanding on such record date
plus the number of additional Preferred  Shares  and/or   equivalent   preferred
shares to be offered for subscription or purchase (or into which the convertible
securities so to be offered are initially convertible);  provided, however, that
in no event shall the  consideration  to be paid upon the  exercise of one Right
be less  than the  aggregate par value  of the shares  of capital  stock of  the
Company  issuable upon exercise of one Right.  In case such  subscription  price
may be  paid in a  consideration  part or all of  which shall 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  holders of  the Rights.  Preferred Shares  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, options  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.

                                      -19-

<PAGE>

     (c) In  case the  Company  shall  fix a record  date for  the making  of  a
distribution  to  all  holders  of  the  Preferred  Shares  (including  any such
distribution  made in  connection with a  consolidation or  merger in  which the
Company is the continuing or surviving corporation) of evidences of indebtedness
or assets (other than a regular quarterly cash dividend or a dividend payable in
Preferred  Shares) or 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 then current per share market price of the Preferred  hares on such
record date,  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 and shall be binding  on the Rights Agent
and  holders of  the Rights) of  the  portion  of  the  assets  or evidences  of
indebtedness  so to be  distributed or of such  subscription  rights or warrants
applicable  to one  Preferred Share and  the  denominator of which shall be such
then-current  per  share  market  price  of  the  Preferred  Shares;   provided,
however,   that  in  no  event  shall  the consideration  to be  paid  upon  the
exercise  of one  Right  be less  than the aggregate  par value of the shares of
capital  stock of the  Company to  be issued  upon  exercise of one Right.  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 again be adjusted to be the Purchase Price which would  then be in  effect
if such record date had not been fixed.

     (d) (i)  For the purpose of any  computation  hereunder,  the "current  per
share  market  price" of  any  security  (a "Security" for  the  purpose of this
Section 11(d)(i)) on any date  shall be  deemed to  be the average  of the daily
closing prices per share  of such Security for the 30

                                      -20-

<PAGE>

consecutive  Trading Days  immediately prior  to such  date; provided,  however,
that, in the event  that the current per share market price of  the Security  is
determined  during  a period following the  announcement  by  the issuer of such
Security of (A) a dividend or distribution on  such Security  payable in  shares
of  such  Security  or  Securities  convertible  into  such  shares, or (B)  any
subdivision,  combination or reclassification  of such Security and prior to the
expiration of 30 Trading Days  after the  ex-dividend date  for such dividend or
distribution,  or  the  record   date  for  such  subdivision,  combination   or
reclassification,  then, and  in each  such case, the  current per  share market
price shall be  appropriately adjusted to  reflect the current  market price per
share  equivalent  of such  Security.  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  Security  is 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  Security is listed or  admitted to trading or,
if the  Security is 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 Security is 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
Security selected by the Board of Directors  of the Company.  The term  "Trading
Day" shall  mean  a  day on  which  the  principal national securities  exchange
on which the Security is listed or admitted to trading is open for the

                                      -21-

<PAGE>

transaction  of  business, or, if  the Security  is not  listed  or admitted  to
trading on any national securities exchange, a Business Day.

     (ii)  For the purpose of any  computation hereunder, the "current per share
market  price" of the  Preferred  Shares shall be determined  in accordance with
the  method  set forth in Section  11(d)(i).  If the  Preferred  Shares  are not
publicly  traded,  the "current per share market price" of the Preferred  Shares
shall be  conclusively  deemed to be the current per share  market  price of the
Common Shares as determined  pursuant to Section 11(d)(i) hereof  (appropriately
adjusted  to reflect any stock  split,  stock  dividend  or similar  transaction
occurring  after the date  hereof),  multiplied  by one hundred.  If neither the
Common Shares nor the Preferred Shares are publicly held or so listed or traded,
"current  per  share  market  price"  shall  mean the fair  value  per  share 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.

     (e)  No adjustment  in the  Purchase Price shall  be required  unless  such
adjustment would require an increase or decrease of at least 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 one  one-millionth  of a
Preferred Share or one  ten-thousandth  of any  other share or security  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  years  from  the  date  of  the  transaction  which  requires such
adjustment or (ii) the date  of the  expiration  of the  right to  exercise  any
Rights.

                                      -22-


<PAGE>

     (f) If, as a result of an adjustment made pursuant to Section 11(a) hereof,
the holder of any Right  thereafter  exercised  shall become entitled to receive
any  shares of  capital  stock of  the  Company  other  than  Preferred  Shares,
thereafter the number of such other shares so  receivable  upon  exercise of any
Right 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
Preferred Shares  contained in Section 11(a) through (c) hereof,  inclusive, and
the provisions of Sections 7, 9, 10 and 13 hereof with respect to the  Preferred
Shares 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 one  one-hundredths of
a Preferred Share 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) hereof,  upon each adjustment of the Purchase Price as a result of
the calculations  made in Sections 11(b) and (c) hereof,  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  one
one-hundredths of a Preferred Share (calculated to the nearest one one-millionth
of a  Preferred  Share)  obtained  by (A)  multiplying  (x)  the  number  of one
one-hundredths  of a  share  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 (B) dividing the product so obtained by the
Purchase  Price in effect  immediately  after such  adjustment  of the  Purchase
Price.

                                      -23-


<PAGE>

     (i)  The Company  may elect, on or  after the date of any adjustment of the
Purchase  Price,  to  adjust  the  number  of  Rights  in  substitution  for any
adjustment in the number of one  one-hundredths of a Preferred Share purchasable
upon  the  exercise  of a  Right.  Each of the  Rights  outstanding  after  such
adjustment  of the number of Rights shall be  exercisable  for the number of one
one-hundredths   of  a  Preferred  Share  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 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 Right
Certificates have been issued,  shall be at least 10 days later than the date of
the public  announcement.  If Right  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 Right Certificates on such record date Right 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 Right Certificates held by such holders prior to the date of
adjustment,  and upon surrender thereof,  if required by the Company,  new Right
Certificates  evidencing  all the Rights to which such holders shall be entitled
after such adjustment.  Right Certificates so to be distributed shall be issued,
executed

                                      -24-

<PAGE>

and countersigned in the manner provided for herein, and shall be registered  in
the names of  the  holders of record of Right  Certificates  on the record  date
specified in the public announcement.

     (j)  Irrespective  of any adjustment  or change  in the Purchase  Price  or
in  the  number  of  one one-hundredths of a Preferred  Share  issuable upon the
exercise of the Rights, the Right Certificates theretofore and thereafter issued
may continue to express the Purchase  Price and the number of one one-hundredths
of a Preferred  Share which were  expressed  in the  initial Right  Certificates
issued  hereunder.

     (k)  Before taking any action that would  cause an adjustment  reducing the
Purchase Price below one  one-hundredth  of the then par value,  if any, of  the
Preferred Shares  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 Preferred Shares at such adjusted  Purchase Price.

     (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
issuing  to  the  holder of  any Right  exercised after such record  date of the
Preferred Shares and other capital stock  or securities  of the Company, if any,
issuable upon such exercise  over  and  above  the  Preferred  Shares 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 upon the  occurrence  of the  event requiring  such  adjustment.

                                      -25-


<PAGE>

     (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 it, in its sole  discretion,  shall determine to be advisable in
order that any  consolidation or subdivision of the  Preferred Shares,  issuance
wholly for cash of any Preferred Shares at less than the  current market  price,
issuance  wholly for  cash of  Preferred  Shares  or securities  which  by their
terms are convertible into or exchangeable  for Preferred  Shares,  dividends on
Preferred Shares  payable  in Preferred Shares or issuance of rights, options or
warrants referred to in Section  11(b) hereof, hereafter  made by the Company to
holders of the  Preferred  Shares shall not be taxable to such stockholders.

     (n)   In the event that, at any time  after the date of  this Agreement and
prior  to  the  Distribution Date,  the  Company  shall (i) declare  or  pay any
dividend on the Common   Shares   payable  in  Common  Shares, or (ii) effect  a
subdivision,   combination   or   consolidation  of   the   Common   Shares  (by
reclassification  or otherwise than by payment of  dividends in  Common  Shares)
into a greater or lesser number of Common  Shares,  then, in any such case,  (A)
the number of one one-hundredths  of a Preferred Share  purchasable  after  such
event upon proper exercise of  each  Right shall  be determined  by  multiplying
the number of one one-hundredths of a Preferred Share so purchasable immediately
prior to such event by a  fraction,  the  numerator  of which  is the  number of
Common Shares outstanding  immediately before such event and the  denominator of
which is the number of Common Shares  outstanding  immediately after such event,
and (B) each Common Share  outstanding  immediately  after such event shall have
issued  with  respect  to it that  number  of Rights  which  each  Common  Share
outstanding  immediately  prior to such event had issued with respect to it. The
adjustments provided for in this Section 11(n) shall

                                      -26-

<PAGE>

be  made  successively  whenever such a  dividend is  declared or paid or such a
subdivision, combination or consolidation is effected.

     Section 12.  Certificate of  Adjusted  Purchase Price or  Number of Shares.
Whenever  an  adjustment is  made as  provided in  Section 11 or 13 hereof,  the
Company shall  promptly (a) prepare a certificate  setting forth such adjustment
and a brief statement of the facts accounting for such adjustment, (b) file with
the  Rights Agent  and with  each transfer  agent for  the  Common Shares or the
Preferred Shares  and the  Securities  and  Exchange  Commission  a copy of such
certificate  and  (c)  if  such   adjustment   occurs  at  any  time  after  the
Distribution  Date,  mail  a brief  summary thereof  to each  holder of  a Right
Certificate in accordance with Section 25 hereof.

     Section  13.   Consolidation,  Merger or  Sale or  Transfer  of  Assets  or
Earning Power. In the event, directly or indirectly,  at any time after a Person
has become an Acquiring Person, (a) the Company shall consolidate with, or merge
with and into,  any other  Person,  (b) any Person  shall  consolidate  with the
Company,  or  merge  with  and into the  Company  and the  Company  shall be the
continuing or surviving  corporation of such merger and, in connection with such
merger,  all or part of the Common Shares shall be changed into or exchanged for
stock or other  securities  of any other  Person (or the Company) or cash or any
other property,  or (c) the Company shall sell or otherwise  transfer (or one or
more of its  Subsidiaries  shall  sell or  otherwise  transfer),  in one or more
transactions,  assets or earning power  aggregating 50% or more of the assets or
earning  power of the  Company  and its  Subsidiaries  (taken as a whole) to any
other  Person  other  than  the  Company  or one  or  more  of its  wholly-owned
Subsidiaries,  then, and in each such case,  proper  provision  shall be made so
that (i) each holder of a Right (except as oth-

                                      -27-

<PAGE>

erwise  provided  herein)  shall thereafter have the right to  receive, upon the
exercise  thereof  at  a  price  equal to  the  then  current   Purchase   Price
multiplied by the number of one one-hundredths  of a Preferred Share for which a
Right is then exercisable, in accordance with the terms of this Agreement and in
lieu of Preferred  Shares,  such  number of Common  Shares of such other  Person
(including  the Company as successor  thereto or as the  surviving  corporation)
as shall equal the result  obtained by (A) multiplying the then current Purchase
Price by the number of one one-hundredths of a Preferred Share for which a Right
is then exercisable and dividing that product by (B) 50% of the then current per
share  market  price of  the  Common Shares of  such  other  Person  (determined
pursuant  to  Section  11(d) hereof)  on  the  date  of  consummation  of   such
consolidation,  merger,  sale or transfer; (ii) the issuer of such Common Shares
shall  thereafter  be  liable  for,  and  shall  assume,  by   virtue  of   such
consolidation, merger, sale or transfer, all  the obligations and  duties of the
Company pursuant to this Agreement; (iii) the term "Company" shall thereafter be
deemed  to refer  to such  issuer; and  (iv) such  issuer shall  take such steps
(including,  but not limited to, the reservation of  a sufficient number  of its
Common  Shares  in accordance  with  Section 9 hereof) in connection  with  such
consummation  as may be  necessary to  assure  that the provisions  hereof shall
thereafter be applicable,  as nearly  as reasonably may  be, in  relation to the
Common Shares of the Company thereafter  deliverable upon the  exercise  of  the
Rights.  The  Company  shall  not  consummate  any  such consolidation,  merger,
sale or transfer unless,  prior thereto, the Company and  such issuer shall have
executed  and  delivered  to  the  Rights  Agent  a  supplemental  agreement  so
providing. The Company shall not enter into any transaction of the kind referred
to in this Section 13  if at the  time of such transaction there are any rights,
warrants,   instruments   or   securities  outstanding  or  any  agreements   or
arrangements  which, as a result of the consummation of such transaction,  would
eliminate or substantially diminish the benefits in-

                                      -28-

<PAGE>

tended to be afforded by the Rights.  The  provisions  of this  Section 13 shall
similarly  apply  to  successive  mergers or  consolidations  or sales  or other
transfers.

     Section 14. Fractional Rights and Fractional  Shares. (a) The Company shall
not be required to issue fractions of Rights or to distribute Right Certificates
which evidence fractional Rights. In lieu of such fractional Rights, there shall
be paid to the registered holders of the Right 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 the 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 for any 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  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 of Directors of the Company.  If on any such
date no such market  maker is making

                                      -29-

<PAGE>

a market in the Rights,  the fair value of the Rights on such date as determined
in good faith by the Board of Directors of the Company shall be used.

     (b)    The   Company   shall   not  be   required  to  issue  fractions  of
Preferred  Shares  (other than  fractions  which are  integral  multiples of one
one-hundredth of a Preferred Share) upon exercise of the Rights or to distribute
certificates  which evidence  fractional  Preferred Shares (other than fractions
which  are  integral  multiples  of one  one-hundredth  of a  Preferred  Share).
Fractions of Preferred  Shares in integral  multiples of one  one-hundredth of a
Preferred Share may, at the election of the Company,  be evidenced by depositary
receipts,  pursuant  to an  appropriate  agreement  between  the  Company  and a
depositary  selected by it;  provided that such agreement shall provide that the
holders of such  depositary  receipts shall have all the rights,  privileges and
preferences  to which they are entitled as  beneficial  owners of the  Preferred
Shares represented by such depositary receipts.  In lieu of fractional Preferred
Shares  that are not  integral  multiples  of one  one-hundredth  of a Preferred
Share, the Company shall pay to the registered  holders of Right 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 Preferred  Share.  For the
purposes of this Section 14(b),  the current  market value of a Preferred  Share
shall be the closing price of a Preferred  Share (as determined  pursuant to the
second  sentence of Section  11(d)(i)  hereof)  for the Trading Day  immediately
prior to the date of such exercise.

     (c) The holder of a Right, by the acceptance of the Right, expressly waives
such holder's right to  receive  any fractional  Rights or any fractional shares
upon exercise of a Right  (except as provided  above).

                                      -30-


<PAGE>

     Section 15. Rights of Action.   All  rights of action  in  respect  of this
Agreement,  excepting  the  rights  of action  given to the Rights  Agent  under
Section 18 hereof,  are  vested in  the  respective  registered  holders  of the
Right Certificates (and, prior to the Distribution Date, the registered  holders
of the  Common  Shares); and any registered holder of any Right Certificate (or,
prior to the Distribution  Date, of the Common Shares),  without the  consent of
the Rights Agent or of the holder of any other Right  Certificate (or,  prior to
the  Distribution Date, of the Common Shares), may, in such  holder's own behalf
and for such  holder's  own benefit, enforce, and may institute and maintain any
suit, action or proceeding against the Company to enforce,  or otherwise  act in
respect of, such  holder's right to exercise the Rights  evidenced by such Right
Certificate  in  the  manner  provided  in such  Right  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
will  be  entitled  to  specific  performance  of  the  obligations  under,  and
injunctive  relief against actual or threatened violations of the obligations of
any Person subject to, this Agreement.

     Section 16.   Agreement  of  Right  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 the Common Shares;

                                      -31-


<PAGE>

     (b)   after the Distribution Date,  the Right Certificates are transferable
only on the registry books of  the Rights  Agent if surrendered at the principal
office of the Rights Agent, duly endorsed or accompanied by a proper  instrument
of transfer; and

     (c) the Company and the Rights Agent may deem and treat the person in whose
name the Right Certificate (or, prior to the  Distribution  Date, the associated
Common Shares certificate) is  registered as  the absolute  owner thereof and of
the  Rights evidenced  thereby  (notwithstanding  any  notations of ownership or
writing on the Right  Certificate or the  associated  Common  Shares certificate
made  by  anyone  other  than the Company or the Rights  Agent) for all purposes
whatsoever, and neither the  Company  nor the Rights  Agent shall be affected by
any notice to the contrary.
     
     Section 17. Right Certificate Holder Not Deemed a  Stockholder.  No holder,
as such, of any Right  Certificate  shall be entitled to vote, receive dividends
or be deemed for  any purpose  the holder of the  Preferred  Shares 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
Right   Certificate  be  construed   to  confer upon the  holder  of  any  Right
Certificate, as such,  any of the  rights of a stockholder of the Company or any
right to  vote for the  election of directors or  upon any  matter  submitted to
stockholders  at  any  meeting  thereof,  or to give or withhold  consent to any
corporate  action,  or to receive notice of meetings or  other actions affecting
stockholders (except as provided in Section 25 hereof),  or to receive dividends
or subscription rights,  or otherwise,  until the  Right or Rights  evidenced by
such  Right  Certificate  shall  have  been  exercised  in accordance  with  the
provisions hereof.

                                      -32-


<PAGE>

     Section 18.   Concerning the Rights Agent. 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 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.

     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
administration  of  this  Agreement  in  reliance upon any Right Certificate  or
certificate  for the  Preferred  Shares or Common Shares 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,  or  otherwise  upon the advice  of counsel  as set forth in
Section 20 hereof.

     Section  19.  Merger or  Consolidation  or Change of Name of Rights  Agent.
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 stock transfer or
corporate trust powers of the Rights Agent or any successor

                                      -33-

<PAGE>

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;  provided that 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 Right  Certificates shall have been
countersigned but not  delivered, any such successor Rights Agent  may adopt the
countersignature  of  the  predecessor  Rights Agent  and  deliver  such   Right
Certificates  so  countersigned; and,  in case  at that  time any  of the  Right
Certificates  shall not have been countersigned,  any  successor   Rights  Agent
may countersign  such  Right Certificates  either in the name of the predecessor
Rights Agent  or in the  name of the successor  Rights Agent; and, in  all  such
cases,  such Right  Certificates  shall  have  the full  force  provided  in the
Right Certificates and in this Agreement.

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

     Section 20.  Duties of Rights Agent. The Rights Agent 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 Right Certificates,
by their acceptance thereof, shall be bound:

                                      -34-

<PAGE>

     (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 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 any one of the Chairman  of the  Board,
the Chief Executive Officer, the President, any Vice President, the Treasurer or
the  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  to the Company  and any
other Person 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 Right
Certificates (except its countersignature  thereof) or be required to verify the
same, 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

                                      -35-

<PAGE>

by  the Rights  Agent) or in respect of the validity or execution  of  any Right
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  Right Certificate;  nor shall it  be  responsible for any
change in the exercisability of the Rights (including the  Rights  becoming void
pursuant  to  Section 11(a)(ii) hereof) or  any  adjustment in  the terms of the
Rights (including the manner, method or amount thereof) provided  for in Section
3, 11, 13, 23 or 24 hereof, or the ascertaining of  the  existence of facts that
would require any such change or adjustment (except with respect to the exercise
of Rights evidenced by  Right Certificates  after actual notice that such change
or  adjustment is required); nor  shall it by  any act hereunder  be  deemed  to
make  any  representation or warranty  as to the authorization or reservation of
any  Preferred  Shares  to  be  issued  pursuant  to this Agreement or any Right
Certificate or as to whether any Preferred Shares will, when 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 any
one of the Chairman of the Board,  the Chief Executive Officer,  the  President,
any Vice President, the Secretary or the 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 by it in good  faith in
accor-

                                      -36-
<PAGE>

dance with instructions of any such officer or for  any  delay  in  acting while
waiting for those instructions.

     (h)  The Rights Agent and any stockholder, 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  that  reasonable  care  was  exercised in  the
selection and continued employment thereof.

     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  30 days'  notice  in writing  mailed to the  Company  and to each transfer
agent of the  Common  Shares  or  Preferred  Shares by  registered

                                      -37-

<PAGE>

or certified mail,  and to the holders of the Right Certificates by  first-class
mail. The Company may remove the Rights Agent or any successor Rights Agent upon
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 Shares
or Preferred Shares  by  registered  or  certified  mail,  and  to  the  holders
of the Right 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 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   Right
Certificate  (which holder shall,  with such notice,  submit such holder's Right
Certificate for inspection by the Company), then  the  registered  holder of any
Right 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  corporation  organized  and
doing  business  under the laws of the United States or of the State of New York
(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 New York,
in good standing, having an office in the State of New York, 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 million or, (b) an affiliate of a corporation  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 Shares or  Preferred  Shares,  and mail a
notice thereof in

                                      -38-

<PAGE>

writing to the  registered  holders of the Right  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 Right Certificates.  Notwithstanding  any of
the provisions of this Agreement or of the Rights to the  contrary,  the Company
may, at its option, issue new Right  Certificates evidencing Rights in such form
as may be approved  by the Board of Directors  of the  Company  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 Right Certificates
made in accordance with the provisions of this Agreement.

     Section 23.   Redemption. (a) The Board of Directors of the Company may, at
its option,  at any time  prior to such  time as any Person becomes an Acquiring
Person,  redeem  all but not  less  than all the then  outstanding  Rights  at a
redemption price of $.01 per Right,  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").
The  redemption  of the Rights by the Board of  Directors  of the Company may be
made effective at such time, on such basis and with such conditions as the Board
of Directors of the Company, in its sole discretion, may establish.

     (b) Immediately  upon the action of the Board of Directors  of  the Company
ordering the redemption of the Rights pursuant to paragraph (a) of this  Section
23, and without any further action and without any notice, the right to exercise
the Rights will terminate and the only

                                      -39-

<PAGE>
right thereafter  of the holders of  Rights shall be  to receive the  Redemption
Price.  The Company shall promptly give  public notice  of any such  redemption;
provided, however, that the failure to give, or any  defect in, any  such notice
shall not affect the  validity of such  redemption.  Within 10 days  after  such
action of the Board of  Directors  of the Company ordering the redemption of the
Rights, the Company shall mail a notice of redemption to all the holders  of the
then outstanding Rights at their last addresses as they appear 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 Shares. 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.  Neither the Company nor
any of its  Affiliates or Associates  may  redeem, acquire or purchase for value
any Rights  at any time in any manner other  than that specifically set forth in
this Section 23 or in Section 24 hereof, and other  than in  connection with the
purchase of Common Shares prior to the Distribution Date.

     Section 24.   Exchange. (a) The Board of  Directors of the Company  may, at
its option, at any time after any Person becomes an Acquiring  Person,  exchange
all  or part of the  then  outstanding and  exercisable  Rights (which shall not
include Rights that have become void pursuant to the provisions of Section 11(a)
(ii) hereof) for Common  Shares at  an exchange  ratio of one Common  Share  per
Right, appropriately  adjusted  to  reflect  any  adjustment  in the  number  of
Rights pursuant to Section 11(i) (such exchange ratio being hereinafter referred
to as  the  "Exchange Ratio").   Notwithstanding  the  foregoing,  the  Board of
Directors of the Company shall not be empowered to effect such  exchange at  any
time after any Person  (other than the Company, any  Subsidiary  of the Company,
any employee benefit plan of the Company or any such Subsidi-

                                      -40-

<PAGE>

ary, or any entity holding Common Shares for or pursuant to  the  terms  of  any
such  plan), together  with  all  Affiliates  and  Associates  of  such  Person,
becomes  the  Beneficial  Owner  of  50%  or  more  of  the  Common Shares  then
outstanding.

     (b)   Immediately   upon  the  action  of  the  Board of  Directors  of the
Company  ordering the exchange of any Rights  pursuant to paragraph  (a) of this
Section 24 and without any further  action and without any notice,  the right to
exercise such Rights shall  terminate and the only right  thereafter of a holder
of such Rights  shall be to receive  that number of Common  Shares  equal to the
number of such Rights held by such holder  multiplied by the Exchange Ratio. The
Company  shall  promptly  give  public  notice of any such  exchange;  provided,
however,  that the  failure to give,  or any defect in,  such  notice  shall not
affect the validity of such exchange.  The Company  promptly shall mail a notice
of any  such  exchange  to all of the  holders  of such  Rights  at  their  last
addresses as they appear upon the registry books of the Rights Agent. 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 exchange will state the
method by which the  exchange of the Common  Shares for Rights will be effected,
and, in the event of any partial  exchange,  the number of Rights  which will be
exchanged.  Any partial  exchange shall be effected pro rata based on the number
of Rights (other than Rights which have become void  pursuant to the  provisions
of Section 11(a)(ii) hereof) held by each holder of Rights.

     (c)   In the event that  there shall not be sufficient Common Shares issued
but not outstanding or authorized but unissued to permit any  exchange of Rights
as contemplated in accordance with this Section 24,  the Company shall  take all
such  action  as  may  be  necessary  to authorize  additional Common Shares for
issuance  upon exchange of the Rights.  In the  event the

                                      -41-

<PAGE>

Company shall, after good  faith  effort,  be unable to take all such action  as
may be necessary to  authorize such additional Common Shares,  the Company shall
substitute, for each Common Share that would otherwise be issuable upon exchange
of a Right, a number  of Preferred Shares  or fraction  thereof  such  that  the
current per share market price of one Preferred Share  multiplied by such number
or fraction is equal to the  current per share  market price of one Common Share
as of the date of issuance of such Preferred Shares or fraction thereof.

     (d)  The Company shall not be required to  issue fractions of Common Shares
or to distribute  certificates  which evidence fractional Common Shares. In lieu
of  such fractional  Common Shares,  the Company  shall pay  to  the  registered
holders of the Right  Certificates  with regard to which such  fractional Common
Shares would  otherwise be issuable an amount in cash equal to the same fraction
of the current  market  value of a whole Common Share.  For the purposes of this
paragraph  (d), the  current  market value of a whole Common  Share shall be the
closing  price of a Common Share (as  determined pursuant to the second sentence
of Section  11(d)(i) hereof) for the Trading Day  immediately  prior to the date
of exchange pursuant to this Section 24.

     Section 25.   Notice of Certain  Events.  (a) In case the Company shall, at
any time after the Distribution  Date,  propose  (i) to pay any dividend payable
in  stock of any  class to the holders  of the Preferred  Shares or to  make any
other distribution to the holders of the Preferred  Shares (other than a regular
quarterly cash dividend), (ii) to offer to the holders  of the Preferred  Shares
rights  or warrants to subscribe  for or to purchase  any  additional  Preferred
Shares  or  shares  of stock  of any  class or  any other  securities, rights or
options,  (iii)  to  effect  any   reclassification   of  the  Preferred  Shares
(other than a reclassification  involving only  the subdivision  of  out-

                                      -42-

<PAGE>

standing Preferred Shares),  (iv) to effect any  consolidation or merger into or
with, or to effect any sale or other  transfer (or to permit  one or more of its
Subsidiaries to effect any sale or other transfer), in one or more transactions,
of  50%  or  more  of  the  assets  or  earning  power  of  the  Company and its
Subsidiaries  (taken  as a  whole)  to,  any  other  Person,  (v) to  effect the
liquidation,  dissolution  or winding up of the Company,  or (vi) to  declare or
pay any dividend on the Common Shares  payable  in Common  Shares or to effect a
subdivision,   combination   or  consolidation   of   the   Common  Shares   (by
reclassification  or otherwise  than by payment of dividends in Common  Shares),
then,  in each such case,   the Company  shall  give to  each  holder of a Right
Certificate,  in accordance with Section 26 hereof,  a notice of  such  proposed
action,  which  shall  specify  the  record  date for the purposes of such stock
dividend,  or 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 Common Shares and/or Preferred Shares, 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 10 days prior to the record date
for  determining  holders of the  Preferred  Shares for purposes of such action,
and, in the case of any such other action, at least 10 days prior to the date of
the  taking  of such  proposed  action or the date of participation  therein  by
the  holders of the Common  Shares  and/or  Preferred Shares, whichever shall be
the earlier.

     (b)  In case the event set forth in Section  11(a)(ii) hereof shall  occur,
then the Company shall, as soon as practicable  thereafter,  give to each holder
of a Right Certificate, in accordance with  Section 26  hereof,  a notice of the
occurrence of such event, which notice shall

                                      -43-

<PAGE>

describe  such  event and  the consequences  of such  event to holders of Rights
under Section 11(a)(ii) hereof.

     Section 26. Notices.  Notices or demands authorized by this Agreement to be
given or made by the Rights Agent or by the holder of any Right  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 with
the Rights Agent) as follows:

                  Ameren Corporation
                  1901 Chouteau Avenue
                  St. Louis, Missouri  63103
                  Attention:  Corporate Secretary


Subject to the provisions of Section 21 hereof,  any notice or demand authorized
by this  Agreement  to be given or made by the  Company  or by the holder of any
Right 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 with the Company) as follows:

                  First Chicago Trust Company of  New York
                  Suite 4660
                  525 Washington Blvd.
                  Jersey City, New Jersey 07310
                  Attention: Tenders and Exchanges 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 Right  Certificate  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.

                                      -44-


<PAGE>

     Section  27.  Supplements  and  Amendments.  The  Company  may from time to
time supplement or amend this Agreement  without the approval of any holders  of
Right Certificates in order to cure any ambiguity,  to correct or supplement any
provision contained herein which may be defective or inconsistent with any other
provisions  herein,  or to make any other  provisions with respect to the Rights
which the  Company may deem  necessary  or  desirable,  any such  supplement  or
amendment  to be  evidenced  by a writing  signed by the  Company and the Rights
Agent;  provided,  however, that, from and after such time as any Person becomes
an Acquiring  Person,  this  Agreement  shall not be amended in any manner which
would adversely affect the interests of the holders of Rights.  Without limiting
the  foregoing,  the  Company  may at any time  prior to such time as any Person
becomes an Acquiring  Person amend this  Agreement to lower the  thresholds  set
forth in  Sections  1(a) and 3(a) hereof to not less than the greater of (a) the
sum of .001% and the largest  percentage of the  outstanding  Common Shares then
known by the  Company to be  beneficially  owned by any Person  (other  than the
Company, any Subsidiary of the Company, any employee benefit plan of the Company
or any  Subsidiary of the Company,  or any entity  holding  Common Shares for or
pursuant to the terms of any such plan) and (b) 10%.

     Section 28.    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.

     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 Right  Certificates (and,  prior to the
Distribution Date,  the Common  Shares) any legal or equitable  right, remedy or
claim under this Agreement; but this Agreement shall be for

                                      -45-

<PAGE>

the  sole  and  exclusive  benefit of  the Company,  the  Rights  Agent and  the
registered  holders of the Right Certificates (and,  prior to  the  Distribution
Date, the Common Shares).

     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.

     Section 31.   Governing  Law.  This  Agreement and  each Right  Certificate
issued hereunder  shall be  deemed to  be a contract  made under the laws of the
State of Missouri and for all purposes  shall be  governed  by and  construed in
accordance with the laws of such state  applicable  to contracts  to be made and
performed entirely within such state.

     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.

                                      -46-


<PAGE>

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

Attest:                                              AMEREN CORPORATION


By                                                    By
    ----------------                                     -----------------
     Name:                                                Name:
     Title:                                               Title


Attest:                                  First Chicago Trust Company of New York

By                                                    By
     ---------------                                      ----------------  
     Name:                                                 Name:
     Title:                                                Title



                                      -47-

<PAGE>

                                                                    Exhibit A



                                      FORM

                                       of

               CERTIFICATE OF DESIGNATION, PREFERENCES AND RIGHTS

                                       of

                  SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                                       of

                               AMEREN CORPORATION

                       (Pursuant to Section 351.180 of the
                        General and Business Corporation
                          Law of the State of Missouri)




     Ameren Corporation, a corporation organized and existing under  the General
and Business  Corporation Law of the State of Missouri  (hereinafter  called the
"Corporation"),  hereby certifies that the following  resolution was  adopted by
the Board of Directors of the Corporation as required by the General Corporation
Law at a meeting duly called and held on October 9, 1998:

     RESOLVED, that pursuant to the authority granted to and vested in the Board
of Directors of this Corporation (hereinafter called the "Board of Directors" or
the  "Board")  in  accordance  with   the  provisions  of  the  Certificate   of
Incorporation,  the Board of  Directors  hereby creates  a series  of  Preferred
Stock, par value $.01 per share, of the Corporation (the "Preferred Stock"), and
hereby  states the  designation  and number of  shares,  and fixes the  relative
rights, preferences, and limitations thereof as follows:

     Series A Junior Participating Preferred Stock:

     Section 1.  Designation and Amount.  The  shares of  such series  shall  be
designated as "Series A Junior  Participating  Preferred  Stock" (the  "Series A
Preferred Stock") and the number of shares constituting the Series A   Preferred
Stock shall be 4,000,000. Such number of shares may be increased or decreased by
resolution of the Board of Directors; provided, that  no  decrease  shall reduce
the number  of  shares of Series A  Preferred  Stock to a number  less than  the


                                      A-1


<PAGE>

number  of  shares  then  outstanding  plus the  number of shares  reserved  for
issuance  upon the exercise of  outstanding  options, rights or warrants or upon
the  conversion  of  any  outstanding  securities  issued  by  the   Corporation
convertible into Series A Preferred Stock.

     Section 2.   Dividends and Distributions.

     (A)      Subject to the rights of the holders of any shares of   any series
of Preferred Stock (or any similar  stock) ranking  prior and  superior  to  the
Series A  Preferred Stock  with respect to  dividends, the  holders of shares of
Series A  Preferred Stock,  in preference  to the  holders  of Common Stock, par
value $.01 per  share (the "Common Stock"), of the Corporation, and of any other
junior  stock, shall  be  entitled  to receive, when, as  and if declared by the
Board  of  Directors  out  of funds legally available for the purpose, quarterly
dividends  payable  in  cash  on  the  first  day  of March, June, September and
December in  each year (each such date being referred  to herein as a "Quarterly
Dividend Payment Date"), commencing on the first Quarterly Dividend Payment Date
after the first issuance of a share or fraction of a share of Series A Preferred
Stock, in an amount per share (rounded to the nearest cent) equal to the greater
of (a) $1 or (b) subject to the provision for adjustment hereinafter  set forth,
100 times the aggregate  per share amount of  all cash dividends, and  100 times
the  aggregate  per share  amount (payable in kind) of all non-cash dividends or
other distributions, other than a dividend payable in shares of Common  Stock or
a subdivision of the outstanding shares of Common Stock (by reclassification  or
otherwise),  declared on  the  Common  Stock  since  the  immediately  preceding
Quarterly Dividend Payment Date or, with respect to the first Quarterly Dividend
Payment Date,  since the  first issuance  of any share or fraction of a share of
Series A Preferred Stock. In the event the Corporation shall at any time declare
or pay  any dividend on the Common Stock payable  in shares of  Common Stock, or
effect a subdivision or  combination or consolidation  of the outstanding shares
of Common Stock (by reclassification or otherwise  than by payment of a dividend
in shares of Common Stock) into a greater or lesser number  of shares of  Common
Stock, then in each  such case the amount to which holders of shares of Series A
Preferred Stock  were entitled immediately prior to such event  under clause (b)
of  the preceding  sentence shall be  adjusted  by multiplying  such amount by a
fraction,  the  numerator  of  which is  the  number  of shares of  Common Stock
outstanding  immediately  after such  event and  the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event.

     (B)   The Corporation  shall  declare  a dividend or  distribution  on  the
Series  A  Preferred  Stock  as  provided  in  paragraph  (A)  of  this  Section
immediately after it declares a dividend  or  distribution  on the Common  Stock
(other  than a dividend  payable in shares of Common  Stock); provided  that, in
the  event no dividend or  distribution  shall have been  declared on the Common
Stock during the period  between any  Quarterly  Dividend  Payment  Date and the
next  subsequent Quarterly  Dividend  Payment  Date, a dividend  of $1 per share
on  the  Series A   Preferred  Stock  shall  nevertheless  be  payable  on  such
subsequent Quarterly Dividend  Payment Date.

                                      A-2


<PAGE>

     (C) Dividends shall begin to accrue and be cumulative on outstanding shares
of  Series A  Preferred Stock  from  the  Quarterly Dividend  Payment Date  next
preceding the  date of  issue of such shares,  unless the  date of issue of such
shares is  prior to the  record  date  for the first Quarterly Dividend  Payment
Date, in which case dividends on such shares shall begin to accrue from the date
of issue of such  shares, or  unless the date  of issue is a Quarterly  Dividend
Payment Date or is a date after the record date for the determination of holders
of shares of Series A Preferred Stock entitled  to  receive a quarterly dividend
and before such  Quarterly Dividend Payment Date, in either of which events such
dividends shall begin to accrue and be  cumulative from such Quarterly  Dividend
Payment Date.   Accrued but unpaid dividends shall not bear interest.  Dividends
paid on  the shares of Series A Preferred Stock in an amount less than the total
amount of such dividends at the time accrued and payable on such shares shall be
allocated  pro rata on a  share-by-share basis among all such shares at the time
outstanding.  The Board of Directors may fix a record date for the determination
of holders of shares of Series A  Preferred Stock  entitled to  receive  payment
of a dividend  or  distribution  declared thereon,  which record  date  shall be
not more than 60 days  prior to the date fixed for the payment thereof.

     Section 3. Voting Rights. The holders of shares of Series A Preferred Stock
shall have the following voting rights:

     (A)     Subject to the provision for adjustment hereinafter set forth, each
share of Series A Preferred Stock  shall entitle the holder thereof to 100 votes
on all matters submitted to a vote of the stockholders of the Corporation.    In
the event the Corporation shall at  any time declare  or pay any dividend on the
Common  Stock  payable in  shares  of Common Stock, or effect  a subdivision  or
combination  or  consolidation  of  the  outstanding  shares of Common Stock (by
reclassification or otherwise than by payment of a  dividend in shares of Common
Stock) into a greater or lesser number of  shares of Common Stock, then in  each
such case the number of votes per share to which holders of  shares of  Series A
Preferred Stock were  entitled immediately prior to such event shall be adjusted
by multiplying such number by a fraction, the  numerator of which is  the number
of  shares of  Common Stock  outstanding  immediately after such event and   the
denominator  of  which  is  the  number  of  shares  of  Common  Stock that were
outstanding immediately prior to such event.

     (B)  Except as otherwise  provided  herein,  in  any  other Certificate  of
Designations  creating a series of Preferred  Stock or any similar stock,  or by
law, the holders of shares of Series A Preferred Stock and the holders of shares
of Common Stock and any other capital stock of the  Corporation  having  general
voting  rights  shall vote  together as one class on all matters  submitted to a
vote of stockholders of the Corporation.

     (C) Except as set forth herein,  or as otherwise  provided by law,  holders
of  Series A   Preferred  Stock  shall  have no special  voting rights and their
consent shall not be required (except to the extent  they are  entitled  to vote
with  holders of  Common Stock  as set forth herein)  for  taking  any corporate
action.

                                      A-3


<PAGE>

     Section 4.   Certain Restrictions.

     (A)   Whenever quarterly  dividends  or  other dividends  or  distributions
payable on the Series A Preferred Stock as provided in Section 2 are in arrears,
thereafter  and  until  all  accrued  and  unpaid  dividends  and distributions,
whether or not declared, on shares of Series A Preferred Stock outstanding shall
have been paid in full, the Corporation shall not:

          (i)     declare or pay dividends, or make any other distributions,  on
     any  shares of  stock  ranking  junior (either  as  to  dividends  or  upon
     liquidation, dissolution or winding up) to the Series A Preferred Stock;

          (ii)    declare or pay dividends, or make any other  distributions, on
     any  shares  of  stock  ranking  on a  parity  (either  as  to dividends or
     upon liquidation, dissolution or  winding up) with  the  Series A Preferred
     Stock, except dividends paid ratably on the  Series A  Preferred  Stock and
     all such  parity stock on  which dividends  are payable  or in  arrears  in
     proportion to the total amounts to which the holders of all such shares are
     then entitled;

          (iii)   redeem  or  purchase or  otherwise  acquire for  consideration
     shares  of  any  stock  ranking  junior (either  as  to dividends  or  upon
     liquidation,  dissolution or winding up) to  the Series A  Preferred Stock,
     provided that the Corporation may at any time redeem, purchase or otherwise
     acquire shares of any such junior  stock  in  exchange for  shares  of  any
     stock of the Corporation  ranking  junior  (either as to  dividends or upon
     dissolution, liquidation or winding up) to the Series A Preferred Stock; or

         (iv)     redeem or purchase or otherwise acquire for  consideration any
     shares  of  Series A Preferred  Stock,  or any shares of stock ranking on a
     parity with  the Series A Preferred  Stock, except  in  accordance  with  a
     purchase offer  made in writing  or by publication  (as determined  by  the
     Board of Directors) to  all holders of  such shares upon such terms as  the
     Board of Directors, after consideration of  the respective  annual dividend
     rates and other relative rights and  preferences  of the  respective series
     and  classes, shall  determine in  good  faith  will  result  in  fair  and
     equitable treatment among the respective series or classes.

     (B) The Corporation  shall not permit any  subsidiary of the Corporation to
purchase or otherwise acquire for  consideration  any  shares  of  stock  of the
Corporation unless the Corporation could, under paragraph (A) of this Section 4,
purchase or otherwise acquire such shares at such time and in such manner.

     Section 5.   Reacquired  Shares.   Any  shares  of Series A Preferred Stock
purchased or  otherwise  acquired by the  Corporation  in any manner  whatsoever
shall be retired and cancelled promptly after the acquisition  thereof. All such
shares  shall upon their cancellation become authorized but  unissued  shares of
Preferred Stock and may be reissued as part of a new series  of Preferred  Stock
subject to  the conditions and restrictions on issuance set forth herein, in

                                      A-4

<PAGE>

the Certificate of Incorporation, or in any  other  Certificate of  Designations
creating  a series  of Preferred Stock  or  any similar  stock  or as  otherwise
required by law.

     Section  6.  Liquidation, Dissolution or Winding Up.  Upon any liquidation,
dissolution or winding up of the Corporation,  no distribution shall be made (1)
to the holders of shares of stock ranking junior (either as to dividends or upon
liquidation,  dissolution or winding up) to the Series A Preferred Stock unless,
prior  thereto,  the  holders of shares of Series A  Preferred  Stock shall have
received  $100 per share,  plus an amount equal to accrued and unpaid  dividends
and distributions thereon, whether or not declared, to the date of such payment,
provided  that the  holders  of  shares  of Series A  Preferred  Stock  shall be
entitled to receive an aggregate amount per share,  subject to the provision for
adjustment  hereinafter set forth, equal to 100 times the aggregate amount to be
distributed  per share to  holders  of shares  of  Common  Stock,  or (2) to the
holders of shares of stock  ranking on a parity  (either as to dividends or upon
liquidation,  dissolution  or  winding  up) with the Series A  Preferred  Stock,
except  distributions  made ratably on the Series A Preferred Stock and all such
parity stock in proportion to the total amounts to which the holders of all such
shares are entitled  upon such  liquidation,  dissolution  or winding up. In the
event the  Corporation  shall at any time  declare  or pay any  dividend  on the
Common  Stock  payable in shares of Common  Stock,  or effect a  subdivision  or
combination  or  consolidation  of the  outstanding  shares of Common  Stock (by
reclassification  or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common  Stock,  then in each
such case the aggregate  amount to which holders of shares of Series A Preferred
Stock were entitled  immediately prior to such event under the proviso in clause
(1) of the preceding  sentence shall be adjusted by multiplying such amount by a
fraction  the  numerator  of which is the  number  of  shares  of  Common  Stock
outstanding  immediately  after such event and the  denominator  of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event.

     Section 7.  Consolidation,  Merger,  etc.   In case  the Corporation  shall
enter into any consolidation,  merger, combination or other transaction in which
the shares of Common  Stock are  exchanged  for or changed  into other  stock or
securities,  cash and/or any other property, then in any such case each share of
Series A  Preferred  Stock  shall at the same  time be  similarly  exchanged  or
changed  into an amount  per  share,  subject to the  provision  for  adjustment
hereinafter  set  forth,  equal to 100  times  the  aggregate  amount  of stock,
securities,  cash and/or any other property  (payable in kind),  as the case may
be, into which or for which each share of Common Stock is changed or  exchanged.
In the event the  Corporation  shall at any time  declare or pay any dividend on
the Common Stock payable in shares of Common Stock,  or effect a subdivision  or
combination  or  consolidation  of the  outstanding  shares of Common  Stock (by
reclassification  or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common  Stock,  then in each
such case the amount set forth in the  preceding  sentence  with  respect to the
exchange  or change of shares of Series A  Preferred  Stock shall be adjusted by
multiplying  such amount by a fraction,  the numerator of which is the number of
shares  of  Common  Stock  outstanding  immediately  after  such  event  and the
denominator  of  which is the  number  of  shares  of  Common  Stock  that  were
outstanding  immediately  prior to such  event.

                                      A-5


<PAGE>

     Section 8. No Redemption.  The shares of Series A Preferred Stock shall not
be redeemable.

     Section 9.  Rank.  The Series A Preferred  Stock shall rank,  with  respect
to the payment of dividends and the distribution of assets, junior to all series
of any other class of the Corporation's Preferred Stock.

     Section  10.   Amendment.    The  Certificate  of  Incorporation   of   the
Corporation  shall not be amended in any manner which would materially  alter or
change the  powers,  preferences  or special   rights  of the Series A Preferred
Stock so as to affect them adversely without the affirmative vote of the holders
of at least two-thirds of  the  outstanding  shares of Series A Preferred Stock,
voting together as a single class.

                                      A-6

<PAGE>


                  IN  WITNESS  WHEREOF,  this  Certificate  of  Designations  is
executed  on  behalf  of the  Corporation  by its Chief  Executive  Officer  and
attested by its Secretary this day of ____________, 199__.




                                             -------------------------------
                                                 Chief Executive Officer


Attest:

- ---------------------
Secretary


                                      A-7

<PAGE>



         
                                                                    Exhibit B

                            Form of Right Certificate

Certificate No. R-                                                    Rights



         NOT EXERCISABLE AFTER OCTOBER 9, 2008 OR EARLIER IF REDEMPTION
         OR EXCHANGE OCCURS.  THE RIGHTS ARE SUBJECT TO REDEMPTION AT
         $.01 PER RIGHT AND TO EXCHANGE ON THE TERMS SET FORTH IN THE
         AGREEMENT.

                                Right Certificate

                               AMEREN CORPORATION

                  This certifies that            , or registered assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the  owner  thereof,  subject  to  the  terms, provisions  and conditions of the
Agreement,  dated  as  of October 9, 1998  (the  "Agreement"),   between  Ameren
Corporation, a Missouri  corporation  (the  "Company"),  and First Chicago Trust
Company of New York (the  "Rights Agent"),  to purchase  from the Company at any
time after the Distribution  Date (as such term is defined in the Agreement) and
prior to 5:00 P.M., New York time, on October 9, 2008 at the principal office of
the Rights Agent,  or at  the  office  of its  successor  as Rights  Agent,  one
one-hundredth  of  a  fully  paid  non-assessable   share  of  Series A   Junior
Participating  Preferred Stock, par  value $.01 per share, of the  Company  (the
"Preferred Shares"),  at a purchase price of  $180  per one  one-hundredth  of a
Preferred Share (the "Purchase  Price"),  upon  presentation  and  surrender  of
this Right  Certificate with the Form of Election  to  Purchase  duly  executed.
The  number of  Rights  evidenced  by this  Right Certificate (and the number of
one one-hundredths of a  Preferred Share  which  may  be purchased upon exercise
hereof) set forth above,  and the Purchase Price set forth above, are the number
and  Purchase Price  as of  October 9, 1998,  based on  the Preferred  Shares as
constituted at such date. As provided in the Agreement,  the Purchase  Price and
the number of one  one-hundredths  of a Preferred  Share  which may be purchased
upon the exercise of the Rights evidenced by this Right Certificate  are subject
to  modification  and adjustment  upon the happening of certain events.

                  This  Right  Certificate  is  subject  to all  of  the  terms,
provisions  and  conditions  of  the  Agreement,  which  terms,  provisions  and
conditions  are hereby  incorporated  herein by reference and made a part hereof
and to which  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 Right Certificates.  Copies
of the Agreement are on file at the principal  executive  offices of the Company
and the offices of the Rights Agent.

                                      B-1


<PAGE>

                  This  Right   Certificate,   with  or  without   other   Right
Certificates, upon surrender at the principal office of the Rights Agent, may be
exchanged for another Right Certificate or Right  Certificates of like tenor and
date evidencing  Rights entitling the holder to purchase a like aggregate number
of Preferred  Shares as the Rights  evidenced by the Right  Certificate or Right
Certificates  surrendered  shall have entitled such holder to purchase.  If this
Right  Certificate  shall be exercised in part,  the holder shall be entitled to
receive upon surrender  hereof another Right  Certificate or Right  Certificates
for the number of whole Rights not exercised.

                  Subject  to  the  provisions  of  the  Agreement,  the  Rights
evidenced  by this Right  Certificate  (i) may be  redeemed  by the Company at a
redemption  price of $.01 per Right or (ii) may be exchanged in whole or in part
for Preferred Shares or shares of the Company's Common Stock, par value $.01 per
share.

                  No  fractional  Preferred  Shares  will  be  issued  upon  the
exercise of any Right or Rights evidenced hereby (other than fractions which are
integral  multiples of one one-hundredth of a Preferred Share, which may, at the
election of the  Company,  be evidenced by  depositary  receipts),  but, in lieu
thereof, a cash payment will be made, as provided in the Agreement.

                  No holder of this Right  Certificate shall be entitled to vote
or receive  dividends  or be deemed for any purpose the holder of the  Preferred
Shares  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 Agreement
or herein be construed  to confer upon the holder  hereof,  as such,  any of the
rights of a stockholder  of the Company or any right to vote for the election of
directors or upon any matter  submitted to stockholders at any meeting  thereof,
or to give or withhold consent to any corporate  action, or to receive notice of
meetings  or other  actions  affecting  stockholders  (except as provided in the
Agreement), or to receive dividends or subscription rights, or otherwise,  until
the  Right or  Rights  evidenced  by this  Right  Certificate  shall  have  been
exercised as provided in the Agreement.

                  This Right  Certificate  shall not be valid or obligatory  for
any purpose until it shall have been countersigned by the Rights Agent.


                                      B-2


<PAGE>

                  WITNESS the facsimile  signature of the proper officers of the
Company and its corporate seal. Dated as of ____________, ____.


ATTEST:                                                AMEREN CORPORATION


                                                      By
- ------------------                                        -----------------
Name:                                                     Name:
Title:                                                    Title:
Countersigned:


First Chicago Trust Company of New York

By
   --------------------
    Name:
    Title:


                                      B-3

<PAGE>


                    Form of Reverse Side of Right Certificate

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

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

                  FOR VALUE RECEIVED _________________ hereby sells, assigns and
transfers unto _________________________________________________________________
________________________________________________________________________________

                  (Please print name and address of transferee)
________________________________________________________________________________
this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably  constitute and appoint __________ Attorney, to transfer
the within Right Certificate on the books of the within-named Company, with full
power of substitution.

Dated: ___________________


                                                       _________________________
                                                              Signature



Signature Guaranteed:
                  Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers,  Inc.,  or a  commercial  bank or trust  company  having  an  office or
correspondent in the United States.


                  The undersigned  hereby certifies that the Rights evidenced by
this Right  Certificate are not beneficially  owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Agreement).



                                                       _________________________
                                                              Signature



                                      B-4

<PAGE>


             Form of Reverse Side of Right Certificate -- continued

                          FORM OF ELECTION TO PURCHASE
                          ----------------------------

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

To:  AMEREN CORPORATION

      The undersigned  hereby  irrevocably elects to exercise___________________
Rights represented by this Right  Certificate  to purchase  the Preferred Shares
issuable  upon the  exercise of such  Rights and requests that  certificates for
such Preferred Shares be issued in the name of:

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 Right
Certificate,  a new Right  Certificate for the balance  remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number


________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________


Dated: _________________

                                                  ______________________________
                                                           Signature


                                      B-5

<PAGE>

Signature Guaranteed:

                  Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers,  Inc.,  or a  commercial  bank or trust  company  having  an  office or
correspondent in the United States.



                  The undersigned  hereby certifies that the Rights evidenced by
this Right  Certificate are not beneficially  owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Agreement).


                                   ___________________________
                                    Signature



                                     NOTICE
                                     ------

                  The signature in the Form of Assignment or Form of Election to
Purchase,  as the case may be, must conform to the name as written upon the face
of this Right Certificate in every particular, without alteration or enlargement
or any change whatsoever.

                  In the event the  certification set forth above in the Form of
Assignment  or the Form of  Election  to  Purchase,  as the case may be,  is not
completed,  the Company and the Rights Agent will deem the  beneficial  owner of
the Rights  evidenced by this Right  Certificate to be an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Agreement) and such Assignment
or Election to Purchase will not be honored.


                                      B-6

<PAGE>


                              
                                                                     Exhibit C
                                                                     ---------

                          SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES


Introduction
- ------------

                  On  October  9,  1998,   the  Board  of  Directors  of  Ameren
Corporation (the "Company")  declared a dividend of one preferred share purchase
right (a "Right") for each outstanding share of common stock, par value $.01 per
share,  of the Company  (the  "Common  Shares").  The dividend is payable on the
tenth day following  approval by the Securities  and Exchange  Commission of the
issuance of the Rights under the Public Utility  Holding Company Act of 1935, as
amended (such date,  the "Record  Date") to the  stockholders  of record on that
date. The description and terms of the Rights are set forth in an Agreement (the
"Agreement") between the Company and First Chicago Trust Company of New York, as
Rights Agent (the "Rights Agent").

Purchase Price
- --------------

                  Each Right entitles the registered holder to purchase from the
Company one one-hundredth of a share of Series A Junior Participating  Preferred
Stock of the Company,  par value $.01 per share (the "Preferred  Shares"),  at a
price of $180 per one one-hundredth of a Preferred Share (the "Purchase Price"),
subject to adjustment.

Flip-In
- -------

                  In the  event  that  any  person  or group  of  affiliated  or
associated  persons  acquires  beneficial  ownership  of  15%  or  more  of  the
outstanding Common Shares (an "Acquiring Person"), each holder of a Right, other
than Rights beneficially owned by the Acquiring Person (which will thereafter be
void),  will  thereafter  have the right to receive upon exercise that number of
Common  Shares  having a market  value of two  times the  exercise  price of the
Right.

Flip-Over
- ---------

                  If the  Company  is  acquired  in a merger  or other  business
combination  transaction  or 50% or more of its  consolidated  assets or earning
power are sold  after a person or group has  become an  Acquiring  Person,  each
holder of a Right (other than Rights beneficially owned by the Acquiring Person,
which will be void) will  thereafter  have the right to receive  that  number of
shares  of  common  stock  of the  acquiring  company  which at the time of such
transaction  will have a market  value of two times  the  exercise  price of the
Right.

                                      C-1


<PAGE>

Distribution Date
- -----------------

                  The distribution date is the earlier of

                  (i) 10 days following a public  announcement  that a person or
group of affiliated or associated persons have acquired beneficial  ownership of
15% or more of the outstanding Common Shares; or

                  (ii) 10 business days (or such later date as may be determined
by action of the Board of  Directors  of the  Company  prior to such time as any
person or group of affiliated persons becomes an Acquiring Person) following the
commencement  of, or  announcement  of an  intention  to make, a tender offer or
exchange  offer  the  consummation  of  which  would  result  in the  beneficial
ownership by a person or group of 15% or more of the outstanding Common Shares.

Transfer and Detachment
- -----------------------

                  Until the  Distribution  Date,  the Rights will be  evidenced,
with  respect  to any of the Common  Share  certificates  outstanding  as of the
Record  Date,  by such Common Share  certificate  with a copy of this Summary of
Rights attached thereto.  Until the Distribution Date (or earlier  redemption or
expiration of the Rights), the Rights will be transferred with and only with the
Common Shares, and transfer of those certificates will also constitute  transfer
of these Rights.

                  As  soon  as  practicable  following  the  Distribution  Date,
separate  certificates  evidencing  the Rights  ("Right  Certificates")  will be
mailed to holders of record of the Common  Shares as of the close of business on
the Distribution Date and such separate Right Certificates alone will thereafter
evidence the Rights.

Exercisability
- --------------
                  The Rights are not exercisable  until the  Distribution  Date.
The Rights will expire on October 9, 2008 (the "Final Expiration Date"),  unless
the Final  Expiration Date is extended or unless the Rights are earlier redeemed
or exchanged by the Company, in each case, as described below.

Adjustments
- -----------
                  The Purchase Price payable, and the number of Preferred Shares
or other  securities  or  property  issuable,  upon  exercise  of the Rights are
subject  to  adjustment  from time to time to prevent  dilution  in the event of
stock dividends, stock splits, reclassifications,  or certain distributions with
respect to the Preferred Shares. The number of outstanding Rights and the number
of one  one-hundredths of a Preferred Share issuable upon exercise of each Right
are also subject to adjustment if, prior to the  Distribution  Date,  there is a
stock  split of the  Common  Shares or a stock  dividend  on the  Common  Shares
payable in Common Shares or subdivisions,  consolidations or combinations of the
Common Shares. With certain exceptions, no adjustment in the Purchase Price will
be required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price. No fractional  Preferred  Shares will be issued (other than
fractions which

                                      C-2

<PAGE>

are integral multiples of one one-hundredth of a Preferred Share,  which may, at
the  election of the Company,  be evidenced by depositary receipts) and, in lieu
thereof,  an adjustment in  cash will  be made based on the  market price of the
Preferred Shares on the last trading day prior to the date of exercise.

Preferred Shares
- ----------------

                  Preferred Shares  purchasable upon exercise of the Rights will
not  be  redeemable.  Each  Preferred  Share  will  be  entitled  to  a  minimum
preferential  quarterly dividend payment of $1 per share but will be entitled to
an aggregate  dividend of 100 times the dividend  declared per Common Share.  In
the event of liquidation,  the holders of the Preferred  Shares will be entitled
to a  minimum  preferential  liquidation  payment  of $100 per share but will be
entitled to an aggregate payment of 100 times the payment made per Common Share.
Each  Preferred  Share  will have 100  votes,  voting  together  with the Common
Shares. Finally, in the event of any merger,  consolidation or other transaction
in which Common Shares are exchanged,  each Preferred  Share will be entitled to
receive  100 times the  amount  received  per  Common  Share.  These  rights are
protected by customary antidilution provisions.

                  The value of the one  one-hundredth  interest  in a  Preferred
Share  purchasable upon exercise of each Right should,  because of the nature of
the Preferred Shares' dividend,  liquidation and voting rights,  approximate the
value of one Common Share.

Exchange
- --------

                  At any time  after any person or group  becomes  an  Acquiring
Person,  and prior to the  acquisition by such person or group of 50% or more of
the  outstanding  Common  Shares,  the Board of  Directors  of the  Company  may
exchange the Rights (other than Rights owned by the Acquiring Person, which will
have  become  void),  in whole or in part,  at an  exchange  ratio of one Common
Share, or one one-hundredth of a Preferred Share (subject to adjustment).

Redemption
- ----------

                  At any time prior to any person or group becoming an Acquiring
Person,  the Board of  Directors  of the Company may redeem the Rights in whole,
but not in part,  at a price of $.01 per Right  (the  "Redemption  Price").  The
redemption  of the Rights may be made  effective at such time on such basis with
such  conditions as the Board of Directors in its sole discretion may establish.
Immediately upon any redemption of the Rights,  the right to exercise the Rights
will  terminate  and the only right of the  holders of Rights will be to receive
the Redemption Price.

Amendments
- ----------
                  The  terms  of the  Rights  may be  amended  by the  Board  of
Directors  of the  Company  without  the  consent of the  holders of the Rights,
including an amendment to lower certain  thresholds  described above to not less
than the  greater  of (i) the sum of .001%  and the  largest  percentage  of the
outstanding  Common Shares then known to the Company to be beneficially owned by
any person or group of  affiliated or  associated  persons and (ii) 10%,  except
that from
                                      C-3

<PAGE>

and after such time  as  any person or group of affiliated or associated persons
becomes an Acquiring Person no such amendment may adversely affect the interests
of the holders of the Rights.

Rights and Holders
- ------------------

                  Until a Right is exercised,  the holder thereof, as such, will
have no rights as a stockholder of the Company,  including,  without limitation,
the right to vote or to receive dividends.

Further Information
- -------------------

                  A copy of the Agreement has been filed with the Securities and
Exchange  Commission as an Exhibit to a Current Report on Form 8-K dated October
9, 1998. A copy of the  Agreement is available  free of charge from the Company.
This  summary  description  of the Rights does not purport to be complete and is
qualified  in its  entirety  by  reference  to the  Agreement,  which is  hereby
incorporated herein by reference.

                                      C-4





[Ameren Corporation Logo Omitted]


Contact:

Investor:                  Media:

Lynn Barnes                Susan Gallagher
(314) 554-4829             (314) 554-2175

            AMEREN CORPORATION DIRECTORS DECLARE QUARTERLY DIVIDEND;
                       APPROVE SHARE PURCHASE RIGHTS PLAN

     St. Louis, Mo., Oct. 9, 1998---The board of directors of Ameren Corporation
(NYSE:  AEE) today  declared a quarterly  dividend  on its common  stock of 63.5
cents per share and  approved a share  purchase  rights plan  designed to assure
shareholders of fair and equal treatment in the event of a proposed takeover.

     The plan is similar to others adopted by more than 2,000  corporations  and
was not adopted in response to any specific  effort to acquire the  corporation.
Adoption of the plan does not have any financial  impact on Ameren or affect its
business plans. A summary of the shareholders  rights plan will be mailed to all
holders of Ameren common shares.

     "The plan was adopted to help protect the interests of our  shareholders in
the event of a takeover  attempt,"  said Charles W.  Mueller,  Ameren  chairman,
president and chief  executive  officer.  "The plan is designed to guard against
abusive tactics to gain control of the company without paying all shareholders a
fair premium for that  control.  In adopting  the plan,  we are  expressing  our
confidence in Ameren's future and taking action to ensure that our  shareholders
are given every opportunity to participate fully in that future."
 
     The  rights  will be  exercisable  only if a person  or group  acquires  15
percent or more of  Ameren's  common  stock or  announces  a tender  offer,  the
consummation  of which  would  result  in  ownership  by a person or group of 15
percent or more of the common  stock.  Each  right  will  entitle  the holder to
purchase  1/100th of a share of a newly  issued  preferred  stock at an exercise
price of $180.

                                   -- more --



<PAGE>

Add One                                

     If a person or group  acquires 15 percent or more of  Ameren's  outstanding
common  stock,  each right will  entitle  its holder  (other than such person or
members of such group) to purchase,  at the right's then-current exercise price,
a number of Ameren's common shares having a market value of twice such price. In
addition,  if  Ameren is  acquired  in a merger  or other  business  combination
transaction  after a  person  or  group  has  acquired  15  percent  or more the
company's  outstanding  common  stock,  each  right will  entitle  its holder to
purchase,  at the right's then-current exercise price, a number of the acquiring
company's common shares having a market value of twice such price. The acquiring
person or group  will not be  entitled  to  exercise  these  rights.  The rights
dividend  is payable 10 days after  approval of the plan by the  Securities  and
Exchange  Commission to shareholders of record on that date; these rights expire
in 2008.

     The common share dividend of 63.5 cents per share declared today is payable
Dec. 31, 1998, to stockholders of record Dec. 9, 1998.

     Separately,  boards of Ameren's  operating  companies also declared regular
quarterly  dividends  on all  classes of  preferred  stock.  The Union  Electric
preferred  stock  dividend is payable Feb. 15, 1999, to  stockholders  of record
Jan. 20, 1999. The CIPS  preferred  stock dividend is payable Dec. 31, 1998, for
stockholders of record Dec. 9, 1998; the CIPS auction rate preferred dividend of
$0.55465 per share,  is payable Nov. 25, 1998, for  stockholders  of record Nov.
24, 1998.

     With assets of $9 billion, Ameren serves 1.5 million electric customers and
300,000  natural gas  customers  in a  44,500-square-mile  area of Missouri  and
Illinois.

                                      # # #




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