CULLEN FROST BANKERS INC
8-A12G/A, 1996-08-01
NATIONAL COMMERCIAL BANKS
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                            SECURITIES AND EXCHANGE COMMISSION

                                  Washington, D.C. 20549

                                       ____________

                                      FORM 8-A12G/A

                                   AMENDMENT NO. 1 TO
                           REGISTRATION STATEMENT ON FORM 8-A

                    FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                         PURSUANT TO SECTION 12(b) OR (g) OF THE
                           SECURITIES EXCHANGE ACT OF 1934

                               Cullen/Frost Bankers, Inc.
             -------------------------------------------------------------
               (Exact name of registrant as specified in its charter)


                             Texas                          74-1751768
             ----------------------------------------    ----------------
             (State of incorporation or organization)    (IRS Employer 
                                                       Identification No.)


                      P.O. Box 1600
                      100 West Houston Street
                      San Antonio, Texas                      78296
             ----------------------------------------       ----------
             (Address of principal executive offices)       (Zip Code)


             Securities registered pursuant to Section 12(b) of the Act:


             Title of each class                 Name of each exchange on which
             to be so registered                 each class is to be registered
             -------------------                 ------------------------------

                    None                                      None 

             Securities to be registered pursuant to Section 12(g) of the Act:


                             Preferred Share Purchase Rights
           -----------------------------------------------------------------
                                    (Title of Class)

<PAGE>


Item 1.      Description of Registrant's Securities to be Registered.
             -------------------------------------------------------

            On July 25, 1989, the Board of Directors of Cullen/Frost Bankers, 
Inc., a Texas corporation (the "Company"), declared a dividend of one preferred 
share purchase right (a "Right") for each share of common stock, par value 
$5.00 per share ("Common Stock"), of the Company held of record at the close of 
business on August 1, 1989 (the "Record Date"), or issued thereafter and prior 
to the Separation Time (as defined in the Original Rights Agreement described 
below).  The Rights were issued pursuant to a Rights Agreement, dated as of 
July 25, 1989, between the Company and The Bank of New York, as rights agent 
(the "Original Rights Agreement").  On July 30, 1996, the Company amended and 
restated the Original Rights Agreement in its entirety (the "Restated Rights 
Agreement") and appointed The Frost National Bank to replace The Bank of New 
York, as Rights Agent.  The terms of the Rights, as so amended, are summarized 
herein.

            Each Right entitles its registered holder to purchase from the 
Company, after the Separation Time, one one-hundredth of a share of Junior 
Participating Preferred Stock, par value $5.00 per share (the "Preferred 
Stock"), for $100 (the "Exercise Price"), subject to adjustment.  The Rights 
will be evidenced by the Common Stock certificates until the close of business 
on the earlier of the date (either, the "Separation Time") which is (i) the 
tenth business day (or such later date as the Board of Directors of the Company 
may from time to time fix by resolution adopted prior to the Separation Time 
that would otherwise have occurred) after the date on which any Person (as 
defined in the Restated Rights Agreement) commences a tender or exchange offer 
which, if consummated, would result in such Person's becoming an Acquiring 
Person, as defined below, or (ii) the tenth business day (or such earlier or 
later date as the Board of Directors of the Company may from time to time fix 
by resolution adopted prior to the Flip-in Date (as defined below) that would 
otherwise have occurred) after the first date of public announcement by the 
Company that such Person has become an Acquiring Person (the "Flip-in Date"); 
provided that if a tender or exchange offer referred to in clause (i) is 
- --------
cancelled, terminated or otherwise withdrawn prior to the Separation Time 
without the purchase of any shares of stock pursuant thereto, such offer shall 
be deemed never to have been made.  An Acquiring Person is any Person who is 
the Beneficial Owner (as defined in the Restated Rights Agreement) of 10% or 
more of the outstanding shares of Common Stock, provided, however, such term 
                                                --------  -------
shall not include (i) the Company, any wholly-owned subsidiary of the Company 
or any employee stock ownership or other employee benefit plan of the Company, 
(ii) any person who is the Beneficial Owner of 10% or more of the outstanding 
Common Stock as of the date of the Restated Rights Agreement or who shall 
become the Beneficial Owner of 10% or more of the outstanding Common Stock 
solely as a result of an acquisition of Common Stock by the Company, until such 
time as such Person acquires additional Common Stock, other than through a 
dividend or stock split, (iii) any Person who becomes an Acquiring Person 
without any plan or intent to seek or affect control of the Company if such 
Person promptly

                                  -2-
<PAGE>

divests sufficient securities such that such 10% or greater Beneficial 
Ownership ceases or (iv) any Person who Beneficially Owns shares of Common 
Stock consisting solely of (A) shares acquired pursuant to the grant or 
exercise of an option granted by the Company in connection with an agreement to 
merge with, or acquire, the Company prior to a Flip-in Date, (B) shares owned 
by such Person and its Affiliates and Associates at the time of such grant, (C) 
shares, amounting to less than 1% of the outstanding Common Stock, acquired by 
Affiliates and Associates of such Person after the time of such grant or (D) 
shares which are held by such Person in trust accounts, managed accounts and 
the like or otherwise held in a fiduciary capacity, that are beneficially owned 
by third persons who are not Affiliates or Associates of such Person or acting 
together with such Person to hold shares, or which are held by such Person in 
respect of a debt previously contracted.  The Restated Rights Agreement 
provides that, until the Separation Time, the Rights will be transferred with 
and only with the Common Stock.  Common Stock certificates issued prior to the 
Separation Time shall evidence one Right for each share of Common Stock 
represented thereby and shall contain a legend incorporating by reference the 
terms of the Restated Rights Agreement (as such may be amended from time to 
time).  Notwithstanding the absence of the aforementioned legend, certificates 
evidencing shares of Common Stock outstanding on or prior to the Record Date or 
which bear an earlier form of legend shall also evidence one Right for each 
share of Common Stock evidenced thereby.  Promptly following the Separation 
Time, separate certificates evidencing the Rights ("Rights Certificates") will 
be mailed to holders of record of Common Stock at the Separation Time.

            The Rights will not be exercisable until the Business Day (as 
defined in the Restated Rights Agreement) following the Separation Time.  The 
Rights will expire on the earlier of (i) the close of business on July 25, 1999 
and (ii) the date on which the Rights are redeemed as described below (in any 
such case, the "Expiration Time").

            The Exercise Price and the number of Rights outstanding, or in 
certain circumstances the securities purchasable upon exercise of the Rights, 
are subject to adjustment from time to time to prevent dilution in the event of 
a Common Stock dividend on, or a subdivision or a combination into a smaller 
number of shares of, Common Stock, or the issuance or distribution of any 
securities or assets in respect of, in lieu of or in exchange for Common Stock.

            In the event that prior to the Expiration Time a Flip-in Date 
occurs, each Right (other than Rights Beneficially Owned by the Acquiring 
Person or any affiliate or associate thereof, which Rights shall become void) 
shall constitute the right to purchase from the Company, upon the exercise 
thereof in accordance with the terms of the Restated Rights Agreement, that 
number of shares of Common Stock of the Company having an aggregate Market 
Price (as defined in the Restated Rights Agreement), on the date of the public 
announcement of an Acquiring Person's becoming such (the "Stock Acquisition 
Date") that

                                  -3-
<PAGE>

gave rise to the Flip-in Date, equal to twice the Exercise Price for an amount 
in cash equal to the then current Exercise Price.  In addition, the Board of 
Directors of the Company may, at its option, at any time after a Flip-in Date 
and prior to the time an Acquiring Person becomes the Beneficial Owner of more 
than 50% of the outstanding shares of Common Stock, elect to exchange all (but 
not less than all) the then outstanding Rights (other than Rights Beneficially 
Owned by the Acquiring Person or any affiliate or associate thereof, which 
Rights become void) for shares of Common Stock at an exchange ratio of one 
share of Common Stock per Right, appropriately adjusted to reflect any stock 
split, stock dividend or similar transaction occurring after the date of the 
Separation Time (the "Exchange Ratio").  Immediately upon such action by the 
Board of Directors (the "Exchange Time"), the right to exercise the Rights will 
terminate and each Right will thereafter represent only the right to receive a 
number of shares of Common Stock equal to the Exchange Ratio.

            Whenever the Company shall become obligated under the preceding 
paragraph to issue shares of Common Stock upon exercise of or in exchange for 
Rights, the Company, at its option, may substitute therefor shares of Preferred 
Stock, at a ratio of one one-hundredth of a share of Preferred Stock for each 
share of Common Stock so issuable.

            In the event that prior to the Expiration Time the Company enters 
into, consummates or permits to occur a transaction or series of transactions 
after the time an Acquiring Person has become such in which, directly or 
indirectly, (i) the Company shall consolidate or merge or participate in a 
binding share exchange with any other Person if, at the time of the 
consolidation, merger or share exchange or at the time the Company enters into 
an agreement with respect to such consolidation, merger or share exchange, the 
Acquiring Person Controls the Board of Directors of the Company (as defined in 
the Restated Rights Agreement) and either (A) any term of or arrangement 
concerning the treatment of shares of capital stock in such merger, 
consolidation or share exchange relating to the Acquiring Person is not 
identical to the terms and arrangements relating to other holders of Common 
Stock or (B) the Person with whom the transaction or series of transactions 
occurs is the Acquiring Person or an Affiliate or Associate of the Acquiring 
Person, (ii) the Company shall sell or otherwise transfer (or one or more of 
its subsidiaries shall sell or otherwise transfer) assets (A) aggregating more 
than 50% of the assets (measured by either book value or fair market value) or 
(B) generating more than 50% of the operating income or cash flow, 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) or to two or more 
such Persons which are affiliated or otherwise acting in concert, if, at the 
time such sale or transfer of assets or at the time the Company (or any such 
subsidiary) enters into an agreement with respect to such sale or transfer, the 
Acquiring Person Controls the Board of Directors of the Company (a "Flip-over 
Transaction or Event") or (iii) any Acquiring Person shall (A) sell, purchase, 
lease, exchange, mortgage, pledge,

                                  -4-
<PAGE>

transfer or otherwise acquire or dispose of, to, from, or with, as the case may 
be, the Company or any of its Subsidiaries, over any period of 12 consecutive 
calendar months, assets (x) having an aggregate fair market value of more than 
$15,000,000 or (y) on terms and conditions less favorable to the Company than 
the Company would be able to obtain through arm's-length negotiations with an 
unaffiliated third party, (B) receive any compensation for services from the 
Company or any of its Subsidiaries, other than compensation for full-time 
employment as a regular employee at rates in accordance with the Company's (or 
its Subsidiaries') past practices, (C) receive the benefit, directly or 
indirectly (except proportionately as a shareholder), over any period of 12 
consecutive calendar months, of any loans, advances, guarantees, pledges, 
insurance, reinsurance or other financial assistance or any tax credits or 
other tax advantage provided by the Company or any of its Subsidiaries 
involving an aggregate principal amount in excess of $5,000,000 or an aggregate 
cost or transfer of benefits from the Company or any of its Subsidiaries in 
excess of $5,000,000 or, in any case, on terms and conditions less favorable to 
the Company than the Company would be able to obtain through arm's-length 
negotiations with a third party, or (D) increase by more than 1% its 
proportionate share of the outstanding shares of any class of equity securities 
or securities convertible into any class of equity securities of the Company or 
any of its Subsidiaries as a result of any acquisition from the Company (with 
or without consideration), any reclassification of securities (including any 
reverse stock split), or recapitalization, of the Company, any merger or 
consolidation of the Company or any other transaction or series of transactions 
(whether or not with or into or otherwise involving an Acquiring Person), the 
Company shall take such action as shall be necessary to ensure, and shall not 
enter into, consummate or permit to occur such Flip-over Transaction or Event 
until it shall have entered into a supplemental agreement with the Person 
engaging in such Flip-over Transaction or Event or the parent corporation 
thereof (the "Flip-over Entity"), for the benefit of the holders of the Rights, 
providing, that upon consummation or occurrence of the Flip-over Transaction or 
Event (i) each Right shall thereafter constitute the right to purchase from the 
Flip-over Entity, upon exercise thereof in accordance with the terms of the 
Restated Rights Agreement, that number of shares of common stock of the Flip-
over Entity having an aggregate Market Price on the date of consummation or 
occurrence of such Flip-over Transaction or Event equal to twice the Exercise 
Price for an amount in cash equal to the then current Exercise Price and (ii) 
the Flip-over Entity shall thereafter be liable for, and shall assume, by 
virtue of such Flip-over Transaction or Event and such supplemental agreement, 
all the obligations and duties of the Company pursuant to the Restated Rights 
Agreement.  For purposes of the foregoing description, the term "Acquiring 
Person" shall include any Acquiring Person and its Affiliates and Associates 
counted together as a single Person.

            The Board of Directors of the Company may, at its option, at any 
time prior to the close of business on the Flip-in Date, redeem all (but not 
less than all) the then outstanding Rights at a price of $.01

                                  -5-
<PAGE>

per Right (the "Redemption Price"), as provided in the Restated Rights 
Agreement.  Immediately upon the action of the Board of Directors of the 
Company electing to redeem the Rights, without any further action and without 
any notice, the right to exercise the Rights will terminate and each Right will 
thereafter represent only the right to receive the Redemption Price in cash for 
each Right so held.

            The holders of Rights will, solely by reason of their ownership of 
Rights, have no rights as shareholders of the Company, including, without 
limitation, the right to vote or to receive dividends.

            The Restated Rights Agreement (which includes as Exhibit A the 
forms of Rights Certificate and Election to Exercise) is attached hereto as an 
exhibit and is incorporated herein by reference.  The foregoing description of 
the Rights is qualified in its entirety by reference to the Restated Rights 
Agreement and such exhibit thereto.

Item 2.    Exhibits.
           --------

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

     1             Amended and Restated Rights Agreement.

     2             Form of Rights Certificate and of Election to Exercise,
                   included in Exhibit A to the Restated Rights Agreement.

     3             Form of Statement of Resolution Establishing Series of 
                   Shares of Participating Junior Preferred Stock, included
                   in Exhibit B to the Restated Rights Agreement.




                                  -6-
<PAGE>


                                   SIGNATURE

            Pursuant to the requirements of Section 12 of the Securities 
Exchange Act of 1934, the registrant has duly caused this registration 
statement to be signed on its behalf by the undersigned, thereunto duly 
authorized.

                             CULLEN/FROST BANKERS, INC.



                             By  /s/
                                 ----------------------------
                                 Name:  
                                 Title: 



Date:  August __, 1996



                                  -7-
<PAGE>





                               EXHIBIT INDEX



Exhibit                                                Sequential
No.                   Description                      Page Numbers
- -------               --------------------             ------------

 (1)                  Amended and Restated Rights
                      Agreement, dated as of 
                      July 30, 1996 (the "Restated 
                      Rights Agreement"), between 
                      Cullen/Frost Bankers, Inc. and 
                      The Frost National Bank, as 
                      Rights Agent.

 (2)                  Form of Rights Certificate and 
                      of Election to Exercise, included 
                      as Exhibit A to the Restated 
                      Rights Agreement 
                      (Exhibit 1 hereto).

 (3)                  Form of Statement of Resolution 
                      Establishing Series of Shares of 
                      Participating Junior Preferred Stock, 
                      included as Exhibit B to the Restated 
                      Rights Agreement (Exhibit 1 hereto).


                                  -8-
 


	




                                                            Exhibit 1




        Amended and Restated Rights Agreement, dated as of July 30, 1996 
      (the "Restated Rights Agreement"), between Cullen/Frost Bankers, Inc. 
                  and The Frost National Bank, as Rights Agent


<PAGE>

========================================================================
                                             PRIVILEDED AND CONFIDENTIAL












                         AMENDED AND RESTATED
                SHAREHOLDER PROTECTION RIGHTS AGREEMENT

                              dated as of

                             July 30, 1996

                                between

                       CULLEN/FROST BANKERS, INC.

                                 and

                        THE FROST NATIONAL BANK,

                            as Rights Agent















========================================================================


<PAGE>





                          AMENDED AND RESTATED
                  SHAREHOLDER PROTECTION RIGHTS AGREEMENT

                           Table of Contents

                                                             Page
                                                             ----


                                Article I
                           CERTAIN DEFINITIONS

Section 1.1  Certain Definitions ...........................  2

                                Article II
                                THE RIGHTS

Section 2.1  Summary of Rights ............................  14
Section 2.2  Legend on Common Stock
               Certificates ...............................  14
Section 2.3  Exercise of Rights; 
               Separation of Rights .......................  15
Section 2.4  Adjustments to Exercise Price;
               Number of Rights ...........................  19
Section 2.5  Date on Which Exercise is 
               Effective ..................................  22
Section 2.6  Execution, Authentication, Delivery
               and Dating of Rights Certificates...........  22
Section 2.7  Registration, Registration of 
               Transfer and Exchange ......................  23
Section 2.8  Mutilated, Destroyed, Lost and 
               Stolen Rights Certificates .................  25
Section 2.9  Persons Deemed Owners ........................  26
Section 2.10 Delivery and Cancellation of 
               Certificates ...............................  27
Section 2.11 Agreement of Rights Holders ..................  28

                               Article III
                ADJUSTMENTS TO THE RIGHTS IN THE EVENT OF 
                         CERTAIN TRANSACTIONS

Section 3.1  Flip-in ......................................  29
Section 3.2  Flip-over ....................................  34

                                Article IV
                            THE RIGHTS AGENT

Section 4.1  General ......................................  35
Section 4.2  Merger or Consolidation or Change of
               Name of Rights Agent .......................  36
Section 4.3  Duties of Rights Agent .......................  38

                                   -i-
<PAGE>

Section 4.4  Change of Rights Agent .......................  42


                               Article V
                             MISCELLANEOUS

Section 5.1  Redemption ...................................  44
Section 5.2  Expiration ...................................  45
Section 5.3  Issuance of New Rights
               Certificates ...............................  45
Section 5.4  Supplements and Amendments ...................  46
Section 5.5  Fractional Shares.............................  46
Section 5.6  Rights of Action .............................  47
Section 5.7  Holder of Rights Not Deemed a Stockholder ....  48
Section 5.8  Notice of Proposed Actions ...................  48
Section 5.9  Notices ......................................  49
Section 5.10 Suspension of Exercisability .................  50
Section 5.11 Costs of Enforcement .........................  51
Section 5.12 Successors ...................................  51
Section 5.13 Benefits of this Agreement ...................  51
Section 5.14 Determination and Actions by 
               by the Board of Directors, etc..............  51
Section 5.15 Descriptive Headings .........................  52
Section 5.16 Governing Law ................................  52
Section 5.17 Counterparts .................................  52
Section 5.18 Severability .................................  53

                                EXHIBITS

Exhibit A    Form of Rights Certificate
               (Together with Form of 
                Election to Exercise)

Exhibit B    Form of Statement of Resolution
               Establishing Series of Shares of
               Junior Participating Preferred Stock



                                  -ii-

<PAGE>




                           AMENDED AND RESTATED
                  SHAREHOLDER PROTECTION RIGHTS AGREEMENT
                  ---------------------------------------


            SHAREHOLDER PROTECTION RIGHTS AGREEMENT (as amended from time to 
time, this "Agreement"), dated as of July 30, 1996, between Cullen/Frost 
Bankers, Inc., a Texas corporation (the "Company"), and The Frost National 
Bank, as Rights Agent (the "Rights Agent", which term shall include any 
successor Rights Agent hereunder).

                              WITNESSETH:
                              ----------
            WHEREAS, the Company and The Bank of New York, as rights agent, 
entered into a Shareholder Protection Rights Agreement, dated as of July 25, 
1989 (hereinafter referred to as the "Original Rights Agreement") with respect 
to the declaration of one right ("Right") in respect of each share of Common 
Stock (as hereinafter defined) held of record as of the close of business on 
August 1, 1989 (the "Record Time"), each Right representing the right to 
purchase one one-hundredth of a share of Preferred Stock (as hereinafter 
defined), upon the terms and conditions set forth in the Original Rights 
Agreement, and the Board of Directors authorized the issuance of one Right in 
respect of each share of Common Stock issued after the Record Time and prior to 
the Separation Time (as defined in the Original Rights Agreement);

            WHEREAS, the Original Rights Agreement provides that prior to the 
Flip-In Date (as defined therein), the Company and the rights agent may amend 
such agreement in any

<PAGE>

 respect (other than to change the Redemption Price or the Expiration Time); 

            WHEREAS, the Flip-In Date has not occurred;
            WHEREAS, the Company desires to appoint The Frost National Bank to 
replace The Bank of New York;

            WHEREAS, the Company and the Rights Agent wish to amend and restate 
the Original Rights Agreement in its entirety as follows:

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

                                ARTICLE I
                          CERTAIN DEFINITIONS
            1.1  Certain Definitions.  For purposes of this Agreement, the 
                 -------------------
following terms have the meanings indicated:
            "Acquiring Person" shall mean any Person who is a Beneficial Owner 
of 10% or more of the outstanding shares of Common Stock; provided, however, 
                                                          --------  -------
that the term "Acquiring Person" shall not include any Person (i) who is the 
Beneficial Owner of 10% or more of the outstanding shares of Common Stock on 
the date of this Agreement or who shall become the Beneficial Owner of 10% or 
more of the outstanding shares of Common Stock solely as a result of an 
acquisition by the Company of shares of Common Stock, until such time hereafter 
or thereafter as any of such Persons shall become the Beneficial Owner (other 
than by means of a 

                                   -2-
<PAGE>

stock dividend or stock split) of any additional shares of Common Stock, (ii) 
who is the Beneficial Owner of 10% or more of the outstanding shares of Common 
Stock but who acquired Beneficial Ownership of shares of Common Stock without 
any plan or intention to seek or affect control of the Company, if such Person 
promptly enters into an irrevocable commitment promptly to divest, and 
thereafter promptly divests (without exercising or retaining any power, 
including voting, with respect to such shares), sufficient shares of Common 
Stock (or securities convertible into, exchangeable into or exercisable for 
Common Stock) so that such Person ceases to be the Beneficial Owner of 10% or 
more of the outstanding shares of Common Stock or (iii) who Beneficially Owns 
shares of Common Stock consisting solely of one or more of (A) shares of Common 
Stock Beneficially Owned pursuant to the grant or exercise of an option granted 
to such Person (an "Option Holder") by the Company in connection with an 
agreement to merge with, or acquire, the Company entered into prior to a Flip-
in Date, (B) shares of Common Stock (or securities convertible into, 
exchangeable into or exercisable for Common Stock), Beneficially Owned by such 
Option Holder or its Affiliates or Associates at the time of grant of such 
option, (C) shares of Common Stock (or securities convertible into, 
exchangeable into or exercisable for Common Stock) acquired by Affiliates or 
Associates of such Option Holder after the time of such

                                   -3-
<PAGE>

grant which, in the aggregate, amount to less than 1% of the outstanding 
shares of Common Stock and (D) shares of Common Stock (or securities 
convertible into, exchangeable into or exercisable for Common Stock) which are 
held by such Person in trust accounts, managed accounts and the like or 
otherwise held in a fiduciary capacity, that are beneficially owned by third 
persons who are not Affiliates or Associates of such Person or acting together 
with such Person to hold such shares, or which are held by such Person in 
respect of a debt previously contracted.  In addition, the Company, any wholly-
owned Subsidiary of the Company and any employee stock ownership or other 
employee benefit plan of the Company or a wholly-owned Subsidiary of the 
Company shall not be an Acquiring Person.
            "Affiliate" and "Associate" shall have the respective meanings 
ascribed to such terms in Rule 12b-2 under the Securities Exchange Act of 1934, 
as such Rule is in effect on the date of this Agreement.
            A Person shall be deemed the "Beneficial Owner", and to have 
"Beneficial Ownership" of, and to "Beneficially Own", any securities as to 
which such Person or any of such Person's Affiliates or Associates is or may be 
deemed to be the beneficial owner of pursuant to Rule 13d-3 and 13d-5 under the 
Securities Exchange Act, as such Rules are in effect on the date of this 
Agreement as well as any securities as to which such Person or any of such 
Person's 

                                  -4-
<PAGE>

Affiliates or Associates has the right to become Beneficial Owner (whether such 
right is exercisable immediately or only after the passage of time or the 
occurrence of conditions) pursuant to any agreement, arrangement or 
understanding, or upon the exercise of conversion rights, exchange rights, 
rights (other than the Rights), warrants or options, or otherwise; provided, 
                                                                   --------
however, that a Person shall not be deemed the "Beneficial Owner", or to have 
- -------
"Beneficial Ownership" of, or to "Beneficially Own", any security (i) solely 
because such security has been tendered pursuant to a tender or exchange offer 
made by such Person or any of such Person's Affiliates or Associates until such 
tendered security is accepted for payment or exchange or (ii) solely because 
such Person or any of such Person's Affiliates or Associates has or shares the 
power to vote or direct the voting of such security pursuant to a revocable 
proxy given in response to a public proxy or consent solicitation made to more 
than ten holders of shares of a class of stock of the Company registered under 
Section 12 of the Securities Exchange Act of 1934 and pursuant to, and in 
accordance with, the applicable rules and regulations under the Securities 
Exchange Act of 1934, except if such power (or the arrangements relating 
thereto) is then reportable under Item 6 of Schedule 13D under the Securities 
Exchange Act of 1934 (or any similar provision of a comparable or successor 
report).  Notwithstanding the foregoing, no officer or

                                  -5-
<PAGE>

director of the Company shall be deemed to Beneficially Own any securities of 
any other Person by virtue of any actions such officer or director takes in 
such capacity.  For purposes of this Agreement, in determining the percentage 
of the outstanding shares of Common Stock with respect to which a Person is the 
Beneficial Owner, all shares as to which such Person is deemed the Beneficial 
Owner shall be deemed outstanding.
            "Business Day" shall mean any day other than a Saturday, Sunday or 
a day on which banking institutions in San Antonio, Texas are generally 
authorized or obligated by law or executive order to close.
            "Close of business" on any given date shall mean 5:00 p.m. San 
Antonio, Texas time on such date or, if such date is not a Business Day, 5:00 
p.m. San Antonio, Texas time on the next succeeding Business Day.
            "Common Stock" shall mean the shares of Common Stock, par value 
$5.00 per share, of the Company.
            "Exchange Time" shall mean the time at which the right to exercise 
the Rights shall terminate pursuant to Section 3.1(c) hereof.
            "Exercise Price" shall mean, as of any date, the price at which a 
holder may purchase the securities issuable upon exercise of one whole Right.  
Until adjustment thereof in accordance with the terms hereof, the Exercise 
Price shall equal $100.

                                  -6-
<PAGE>

            "Expiration Time" shall mean the earlier of (i) the Redemption Time 
or (ii) the close of business on July 25, 1999.
            "Flip-in Date" shall mean the tenth business day after any Stock 
Acquisition Date or such earlier or later date as the Board of Directors of the 
Company may from time to time fix by resolution adopted prior to the Flip-in 
Date that would otherwise have occurred.
            "Flip-over Entity," for purposes of Section 3.2, shall mean (i) in 
the case of a Flip-over Transaction or Event described in clause (i) of the 
definition thereof, the Person issuing any securities into which shares of 
Common Stock are being converted or exchanged and, if no such securities are 
being issued, the other party to such Flip-over Transaction or Event and (ii) 
in the case of a Flip-over Transaction or Event referred to in clause (ii) or 
(iii) of the definition thereof, the Person receiving the greatest portion of 
the assets or earning power being transferred in such Flip-over Transaction or 
Event, provided in all cases if such Person is a subsidiary of a corporation, 
the parent corporation shall be the Flip-Over Entity.
            "Flip-over Stock" shall mean the capital stock (or similar equity 
interest) with the greatest voting power in respect of the election of 
directors (or other persons

                                  -7-
<PAGE>

similarly responsible for direction of the business and affairs) of the Flip-
Over Entity.
            "Flip-over Transaction or Event" shall mean a transaction or series 
of transactions after a Flip-in Date in which, directly or indirectly, (i) the 
Company shall consolidate or merge or participate in a share exchange with any 
other Person if, at the time of the consolidation, merger or share exchange or 
at the time the Company enters into any agreement with respect to any such 
consolidation, merger or share exchange, the Acquiring Person Controls the 
Board of Directors of the Company and either (A) any term of or arrangement 
concerning the treatment of shares of capital stock in such consolidation, 
merger or share exchange relating to the Acquiring Person is not identical to 
the terms and arrangements relating to other holders of the Common Stock or (B) 
the Person with whom the transaction or series of transactions occurs is the 
Acquiring Person or an Affiliate or Associate of the Acquiring Person, (ii) the 
Company shall sell or otherwise transfer (or one or more of its Subsidiaries 
shall sell or otherwise transfer) assets (A) aggregating more than 50% of the 
assets (measured by either book value or fair market value) or (B) generating 
more than 50% of the operating income or cash flow, of the Company and its 
Subsidiaries (taken as a whole) to any Person (other than the Company or one or 
more of its wholly owned Subsidiaries) or to two or more such Persons which are

                                  -8-
<PAGE>

Affiliates or Associates or otherwise acting in concert, if, at the time of the 
entry by the Company (or any such Subsidiary) into an agreement with respect to 
such sale or transfer of assets, the Acquiring Person Controls the Board of 
Directors of the Company, or (iii) any Acquiring Person shall (A) sell, 
purchase, lease, exchange, mortgage, pledge, transfer or otherwise acquire or 
dispose of, to, from, or with, as the case may be, the Company or any of its 
Subsidiaries, over any period of 12 consecutive calendar months, assets (x) 
having an aggregate fair market value of more than $15,000,000 or (y) on terms 
and conditions less favorable to the Company than the Company would be able to 
obtain through arm's-length negotiations with an unaffiliated third party, (B) 
receive any compensation for services from the Company or any of its 
Subsidiaries, other than compensation for full-time employment as a regular 
employee at rates in accordance with the Company's (or its Subsidiaries') past 
practices, (C) receive the benefit, directly or indirectly (except 
proportionately as a shareholder), over any period of 12 consecutive calendar 
months, of any loans, advances, guarantees, pledges, insurance, reinsurance or 
other financial assistance or any tax credits or other tax advantage provided 
by the Company or any of its Subsidiaries involving an aggregate principal 
amount in excess of $5,000,000 or an aggregate cost or transfer of benefits 
from the Company or any of its

                                  -9-
<PAGE>

Subsidiaries in excess of $5,000,000 or, in any case, on terms and conditions 
less favorable to the Company than the Company would be able to obtain through 
arm's-length negotiations with a third party, or (D) increase by more than 1% 
its proportionate share of the outstanding shares of any class of equity 
securities or securities convertible into any class of equity securities of the 
Company or any of its Subsidiaries as a result of any acquisition from the 
Company (with or without consideration), any reclassification of securities 
(including any reverse stock split), or recapitalization, of the Company, any 
merger or consolidation of the Company or any other transaction or series of 
transactions (whether or not with or into or otherwise involving an Acquiring 
Person).  For purposes of the foregoing description, the term "Acquiring 
Person" shall include any Acquiring Person and its Affiliates and Associates, 
counted together as a single Person.  An Acquiring Person shall be deemed to 
Control the Company's Board of Directors when, following a Flip-in Date, the 
persons who were directors of the Company before the Flip-in Date shall cease 
to constitute a majority of the Company's Board of Directors.
            "Market Price" per share of any securities on any date shall mean 
the average of the daily closing prices per share of such securities 
(determined as described below) on each of the 20 consecutive Trading Days 
through and

                                  -10-
<PAGE>

including the Trading Day immediately preceding such date; provided, however, 
                                                           --------  -------
that if an event of a type analogous to any of the events described in Section 
2.4 hereof shall have caused the closing prices used to determine the Market 
Price on any Trading Days during such period of 20 Trading Days not to be fully 
comparable with the closing price on such date, each such closing price so used 
shall be appropriately adjusted in order to make it fully comparable with the 
closing price on such date.  The closing price per share of any securities on 
any date shall be the last reported sale price, regular way, or, in case no 
such sale takes place or is quoted on such date, the average of the closing bid 
and asked prices, regular way, for each share of such securities, 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, Inc. or, if the securities are not listed or admitted to trading on 
the New York Stock Exchange, Inc., as reported in the principal consolidated 
transaction reporting system with respect to securities listed on the principal 
national securities exchange on which the securities are listed or admitted to 
trading or, if the securities are not listed or admitted to trading on any 
national securities exchange, as reported by the National Association of 
Securities Dealers, Inc. Automated Quotation System or such other system then 
in use, or, if on any such date the securities

                                  -11-
<PAGE>

are not listed or admitted to trading on any national securities exchange or 
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 secu-
rities selected by the Board of Directors of the Company; provided, however, 
                                                          --------  -------
that if on any such date the securities are not listed or admitted to trading 
on a national securities exchange or traded in the over-the-counter market, the 
closing price per share of such securities on such date shall mean the fair 
value per share of securities on such date as determined in good faith by the 
Board of Directors of the Company, after consultation with a nationally recog-
nized investment banking firm, and set forth in a certificate delivered to the 
Rights Agent. 
            "Person" shall mean any individual, firm, partnership, association, 
group (as such term is used in Rule 13d-5 under the Securities Exchange Act of 
1934, as such Rule is in effect on the date of this Agreement), corporation or 
other entity.
            "Preferred Stock" shall mean the series of Junior Participating 
Preferred Stock, par value $5.00 per share, of the Company created by a State 
of Resolution Establishing Series of Shares in substantially the form set forth 
in Exhibit B hereto appropriately completed.
            "Redemption Price" shall mean an amount (calculated to the nearest 
one one-hundredth of a cent)

                                  -12-
<PAGE>

equal to the Exercise Price, as in effect at the Redemption Time, divided by 
10,000 (i.e., initially $0.01).
            "Redemption Time" shall mean the time at which the right to 
exercise the Rights shall terminate pursuant to Section 5.1 hereof.
            "Separation Time" shall mean the close of business on the earlier 
of (i) the tenth business day (or such later date as the Board of Directors of 
the Company may from time to time fix by resolution adopted prior to the 
Separation Time that would otherwise have occurred) after the date on which any 
Person commences a tender or exchange offer which, if consummated, would result 
in such Person's becoming an Acquiring Person and (ii) the Flip-in Date; 
provided, that if any tender or exchange offer referred to in clause (i) of 
- --------
this paragraph is cancelled, terminated or otherwise withdrawn prior to the 
Separation Time without the purchase of any shares of Common Stock pursuant 
thereto, such offer shall be deemed, for purposes of this paragraph, never to 
have been made.
            "Stock Acquisition Date" shall mean the first date of public 
announcement by the Company (by any means) that an Acquiring Person has become 
such.
            "Subsidiary" of any specified Person shall mean any corporation or 
other entity of which a majority of the voting power of the equity securities 
or a majority of the

                                  -13-
<PAGE>

equity interest is Beneficially Owned, directly or indirectly, by such Person.
            "Trading Day," when used with respect to any securities, shall mean 
a day on which the New York Stock Exchange, Inc. is open for the transaction of 
business or, if such securities are not listed or admitted to trading on the 
New York Stock Exchange, Inc., a day on which the principal national securities 
exchange on which such securities are listed or admitted to trading is open for 
the transaction of business or, if such securities are not listed or admitted 
to trading on any national securities exchange, a Business Day.

                                ARTICLE II
                                THE RIGHTS

            2.1  Summary of Rights.  As soon as practicable after the Record 
                 -----------------
Time, the Company will mail a letter summarizing the terms of the Rights to 
each holder of record of Common Stock as of the Record Time, at such holder's 
address as shown by the records of the Company.
            2.2  Legend on Common Stock Certificates.  Certificates for the 
                 -----------------------------------
Common Stock issued after the Record Time but prior to the Separation Time 
shall evidence one Right for each share of Common Stock represented thereby and 
shall have impressed on, printed on, written on or otherwise affixed to them 
the following legend:

                                  -14-
<PAGE>

     Until the Separation Time (as defined in the Rights Agreement referred to 
     below), this certificate also evidences and entitles the holder hereof to 
     certain Rights as set forth in a Rights Agreement, dated as of July 25,   
     1989 (as such may be amended from time to time, the "Rights Agreement"),  
     between Cullen/Frost Bankers, Inc. (the "Company") and The Bank of New    
     York, as Rights Agent, the terms of which are hereby incorporated herein  
     by reference and a copy of which is on file at the principal executive    
     offices of the Company.  Under certain circumstances, as set forth in the  
     Rights Agreement, such Rights may be redeemed, may be exchanged for shares 
     of Common Stock or other securities or assets of the Company, may expire,  
     may become void (if they are "Beneficially Owned" by an "Acquiring Person" 
     or an Affiliate or Associate thereof, as such terms are defined in the    
     Rights Agreement, or by any transferee of any of the foregoing) or may be 
     evidenced by separate certificates and may no longer be evidenced by this 
     certificate.  The Company will mail or arrange for the mailing of a copy  
     of the Rights Agreement to the holder of this certificate without charge  
     within five days after the receipt of a written request therefor.

Certificates representing shares of Common Stock that are issued and 
outstanding at the Record Time shall evidence one Right for each share of 
Common Stock evidenced thereby notwithstanding the absence of the foregoing 
legend.
            2.3  Exercise of Rights; Separation of Rights.  (a) Subject to 
                 ----------------------------------------
Sections 3.1, 5.1 and 5.10 and subject to adjustment as herein set forth, each 
Right will entitle the holder thereof, after the Separation Time and prior to 
the Expiration Time, to purchase, for the Exercise Price, one one-hundredth of 
a share of Preferred Stock.
            (b)  Until the Separation Time, (i) no Right may be exercised and 
(ii) each Right will be evidenced by the certificate for the associated share 
of Common Stock 

                                 -15-
<PAGE>

(together, in the case of certificates issued prior to the Record Time, with 
the letter mailed to the record holder thereof pursuant to Section 2.1) and 
will be transferable only together with, and will be transferred by a transfer 
(whether with or without such letter) of, such associated share.  
            (c)  Subject to the terms and conditions hereof, after the 
Separation Time and prior to the Expiration Time, the Rights (i) may be 
exercised and (ii) may be transferred independent of shares of Common Stock.  
Promptly following the Separation Time, the Rights Agent will mail to each 
holder of record of Common Stock as of the Separation Time (other than any 
Person whose Rights have become void pursuant to Section 3.1(b)), at such 
holder's address as shown by the records of the Company (the Company hereby 
agreeing to furnish copies of such records to the Rights Agent for this 
purpose), (x) a certificate (a "Rights Certificate") in substantially the form 
of Exhibit A hereto appropriately completed, representing the number of Rights 
held by such holder at the Separation Time and having such marks of identifi-
cation or designation and such legends, summaries or endorsements printed 
thereon as the Company may deem appropriate and as are not inconsistent with 
the provisions of this Agreement, or as may be required to comply with any law 
or with any rule or regulation made pursuant thereto or with any rule or 
regulation of any

                                 -16-
<PAGE>

national securities exchange or quotation system on which the Rights may from 
time to time be listed or traded, or to conform to usage, and (y) a disclosure 
statement describing the Rights.
             (d)  Subject to the terms and conditions hereof, Rights may be 
exercised on any Business Day after the Separation Time and prior to the 
Expiration Time by submitting to the Rights Agent the Rights Certificate 
evidencing such Rights with an Election to Exercise (an "Election to Exercise") 
substantially in the form attached to the Rights Certificate duly completed, 
accompanied by payment in cash, or by certified or official bank check or money 
order payable to the order of the Company, of a sum equal to the Exercise Price 
multiplied by the number of Rights being exercised and a sum sufficient to 
cover any transfer tax or charge which may be payable in respect of any 
transfer involved in the transfer or delivery of Rights Certificates or the 
issuance or delivery of certificates for shares or depositary receipts (or 
both) in a name other than that of the holder of the Rights being exercised.
            (e)  Upon receipt of a Rights Certificate, with an Election to 
Exercise accompanied by payment as set forth in Section 2.3(d), and subject to 
the terms and conditions hereof, the Rights Agent will thereupon promptly 
(i)(A) requisition from a transfer agent stock certificates evidencing such 
number of shares or other securities to be

                                  -17-
<PAGE>

purchased (the Company hereby irrevocably authorizing its transfer agents to 
comply with all such requisitions) and (B) if the Company elects pursuant to 
Section 5.5 not to issue certificates representing fractional shares, 
requisition from the depositary selected by the Company depositary receipts 
representing the fractional shares to be purchased or requisition from the 
Company the amount of cash to be paid in lieu of fractional shares in 
accordance with Section 5.5 and (ii) after receipt of such certificates, 
depositary receipts and/or cash, deliver the same to or upon the order of the 
registered holder of such Rights Certificate, registered (in the case of 
certificates or depositary receipts) in such name or names as may be designated 
by such holder.
            (f)  In case the holder of any Rights shall exercise less than all 
the Rights evidenced by such holder's Rights Certificate, a new Rights 
Certificate evidencing the Rights remaining unexercised will be issued by the 
Rights Agent to such holder or to such holder's duly authorized assigns.
            (g)  The Company covenants and agrees that it will (i) take all 
such action as may be necessary to ensure that all shares delivered upon 
exercise of Rights shall, at the time of delivery of the certificates for such 
shares (subject to payment of the Exercise Price), be duly and validly 
authorized, executed, issued and delivered and fully paid

                                 -18-
<PAGE>


and nonassessable; (ii) take all such action as may be necessary to comply 
with any applicable requirements of the Securities Act of 1933 or the 
Securities Exchange Act of 1934, and the rules and regulations thereunder, and 
any other applicable law, rule or regulation, in connection with the issuance 
of any shares upon exercise of Rights; and (iii) pay when due and payable any 
and all federal and state transfer taxes and charges which may be payable in 
respect of the original issuance or delivery of the Rights Certificates or of 
any shares issued upon the exercise of Rights, provided that the Company shall 
not be required to pay any transfer tax or charge which may be payable in 
respect of any transfer involved in the transfer or delivery of Rights 
Certificates or the issuance or delivery of certificates for shares in a name 
other than that of the holder of the Rights being transferred or exercised.
             2.4  Adjustments to Exercise Price; Number of Rights.  (a) In the 
                  -----------------------------------------------
event the Company shall at any time after the Record Time and prior to the 
Separation Time (i) declare or pay a dividend on Common Stock payable in Common 
Stock, (ii) subdivide the outstanding Common Stock or (iii) combine the 
outstanding Common Stock into a smaller number of shares of Common Stock, (x) 
the Exercise Price in effect after such adjustment will be equal to the 
Exercise Price in effect immediately prior to such adjustment divided by the 
number of shares of Common Stock (the "Expansion

                                 -19-
<PAGE>

Factor") that a holder of one share of Common Stock immediately prior to such 
dividend, subdivision or combination would hold thereafter as a result thereof 
and (y) each Right held prior to such adjustment will become that number of 
Rights equal to the Expansion Factor, and the adjusted number of Rights will be 
deemed to be distributed among the shares of Common Stock with respect to which 
the original Rights were associated (if they remain outstanding) and the shares 
issued in respect of such dividend, subdivision or combination, so that each 
such share of Common Stock will have exactly one Right associated with it.  
Each adjustment made pursuant to this paragraph shall be made as of the payment 
or effective date for the applicable dividend, subdivision or combination.
            In the event the Company shall at any time after the Record Time 
and prior to the Separation Time issue any shares of Common Stock otherwise 
than in a transaction referred to in the preceding paragraph, each such share 
of Common Stock so issued shall automatically have one new Right associated 
with it, which Right shall be evidenced by the certificate representing such 
share.  To the extent provided in Section 5.3, Rights shall be issued by the 
Company in respect of shares of Common Stock that are issued or sold by the 
Company after the Separation Time.
            (b)  In the event the Company shall at any time after the Record 
Time and prior to the Separation Time issue

                                 -20-
<PAGE>

or distribute any securities or assets in respect of, in lieu of or in 
exchange for Common Stock (other than pursuant to a regular periodic cash 
dividend or a dividend paid solely in Common Stock) whether by dividend, in a 
reclassification or recapitalization (including any such transaction involving 
a merger, consolidation or share exchange), or otherwise, the Company shall 
make such adjustments, if any, in the Exercise Price, number of Rights and/or 
securities or other property purchasable upon exercise of Rights as the Board 
of Directors of the Company, in its sole discretion, may deem to be appropriate 
under the circumstances in order to adequately protect the interests of the 
holders of Rights generally, and the Company and the Rights Agent shall amend 
this Agreement as necessary to provide for such adjustments.
            (c)  Each adjustment to the Exercise Price made pursuant to this 
Section 2.4 shall be calculated to the nearest cent.  Whenever an adjustment to 
the Exercise Price is made pursuant to this Section 2.4, the Company shall (i) 
promptly prepare a certificate setting forth such adjustment and a brief 
statement of the facts accounting for such adjustment and (ii) promptly file 
with the Rights Agent and with each transfer agent for the Common Stock a copy 
of such certificate.
            (d)  Rights certificates shall represent the securities purchasable 
under the terms of this Agreement,

                                 -21-
<PAGE>

including any adjustment or change in the securities purchasable upon exercise 
of the Rights, even though such certificates may continue to express the 
securities purchasable at the time of issuance of the initial Rights 
Certificates.
            2.5  Date on Which Exercise is Effective.  Each person in whose 
                 -----------------------------------
name any certificate for shares is issued upon the exercise of Rights shall for 
all purposes be deemed to have become the holder of record of the shares 
represented thereby on the date upon which the Rights Certificate evidencing 
such Rights was duly surrendered and payment of the Exercise Price for such 
Rights (and any applicable taxes and other governmental charges payable by the 
exercising holder hereunder) was made; provided, however, that if the date of 
                                       --------  -------
such surrender and payment is a date upon which the stock 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 stock transfer books of the Company are 
open.  
            2.6  Execution, Authentication, Delivery and Dating of Rights 
                 --------------------------------------------------------
Certificates.  (a)  The Rights Certificates shall be executed on behalf of the 
- ------------
Company by its Senior Chairman of the Board, Chairman of the Board, President 
or one of its Vice Presidents, under its corporate seal reproduced thereon 
attested by its Secretary or one of its

                                 -22-
<PAGE>


Assistant Secretaries.  The signature of any of these officers on the Rights 
Certificates may be manual or facsimile.
            Rights Certificates bearing the manual or facsimile signatures of 
individuals who were at any time the proper officers of the Company shall bind 
the Company, notwithstanding that such individuals or any of them have ceased 
to hold such offices prior to the countersignature and delivery of such Rights 
Certificates.
            Promptly after the Separation Time, the Company will notify the 
Rights Agent of such Separation Time and will deliver Rights Certificates 
executed by the Company to the Rights Agent for countersignature, and, subject 
to Section 3.1(b), the Rights Agent shall manually countersign and deliver such 
Rights Certificates to the holders of the Rights pursuant to Section 2.3(c) 
hereof.  No Rights Certificate shall be valid for any purpose unless manually 
countersigned by the Rights Agent.
            (b)  Each Rights Certificate shall be dated the date of 
countersignature thereof.
            2.7  Registration, Registration of Transfer and Exchange.  (a)  
                 ---------------------------------------------------
After the Separation Time, the Company will cause to be kept a register (the 
"Rights Register") in which, subject to such reasonable regulations as it may 
prescribe, the Company will provide for the registration and transfer of 
Rights.  The Rights Agent is hereby appointed

                                 -23-
<PAGE>

"Rights Registrar" for the purpose of maintaining the Rights Register for the 
Company and registering Rights and transfers of Rights after the Separation 
Time as herein provided.  In the event that the Rights Agent shall cease to be 
the Rights Registrar, the Rights Agent will have the right to examine the 
Rights Register at all reasonable times after the Separation Time.
            After the Separation Time and prior to the Expiration Time, upon 
surrender for registration of transfer or exchange of any Rights Certificate, 
and subject to the provisions of Section 2.7(c) and (d), the Company will 
execute, and the Rights Agent will countersign and deliver, in the name of the 
holder or the designated transferee or transferees, as required pursuant to the 
holder's instructions, one or more new Rights Certificates evidencing the same 
aggregate number of Rights as did the Rights Certificate so surrendered.
            (b)  Except as otherwise provided in Section 3.1(b), all Rights 
issued upon any registration of transfer or exchange of Rights Certificates 
shall be the valid obligations of the Company, and such Rights shall be 
entitled to the same benefits under this Agreement as the Rights surrendered 
upon such registration of transfer or exchange.
            (c)  Every Rights Certificate surrendered for registration of 
transfer or exchange shall be duly endorsed,

                                 -24-
<PAGE>

or be accompanied by a written instrument of transfer in form satisfactory to 
the Company or the Rights Agent, as the case may be, duly executed by the 
holder thereof or such holder's attorney duly authorized in writing.  As a 
condition to the issuance of any new Rights Certificate under this Section 2.7, 
the Company may require the payment of a sum sufficient to cover any tax or 
other governmental charge that may be imposed in relation thereto.
            (d)  The Company shall not be required to register the transfer or 
exchange of any Rights after such Rights have become void under Section 3.1(b), 
been exchanged under Section 3.1(c) or been redeemed under Section 5.1.
            2.8  Mutilated, Destroyed, Lost and Stolen Rights Certificates.  
                 ---------------------------------------------------------
(a)  If any mutilated Rights Certificate is surrendered to the Rights Agent 
prior to the Expiration Time, then, subject to Sections 3.1(b), 3.1(c) and 5.1, 
the Company shall execute and the Rights Agent shall countersign and deliver in 
exchange therefor a new Rights Certificate evidencing the same number of Rights 
as did the Rights Certificate so surrendered.
            (b)  If there shall be delivered to the Company and the Rights 
Agent prior to the Expiration Time (i) evidence to their satisfaction of the 
destruction, loss or theft of any Rights Certificate and (ii) such security or 
indemnity as may be required by them to save each of them and any of their 
agents harmless, then, subject to Sections

                                 -25-
<PAGE>


3.1(b), 3.1(c) and 5.1 and in the absence of notice to the Company or the 
Rights Agent that such Rights Certificate has been acquired by a bona fide 
                                                                 ---- ----
purchaser, the Company shall execute and upon its request the Rights Agent 
shall countersign and deliver, in lieu of any such destroyed, lost or stolen 
Rights Certificate, a new Rights Certificate evidencing the same number of 
Rights as did the Rights Certificate so destroyed, lost or stolen.
            (c)  As a condition to the issuance of any new Rights Certificate 
under this Section 2.8, the Company may require the payment of a sum sufficient 
to cover any tax or other governmental charge that may be imposed in relation 
thereto and any other expenses (including the fees and expenses of the Rights 
Agent) connected therewith.
            (d)  Every new Rights Certificate issued pursuant to this Section 
2.8 in lieu of any destroyed, lost or stolen Rights Certificate shall evidence 
an original additional contractual obligation of the Company, whether or not 
the destroyed, lost or stolen Rights Certificate shall be at any time 
enforceable by anyone, and, subject to Section 3.1(b) shall be entitled to all 
the benefits of this Agreement equally and proportionately with any and all 
other Rights duly issued hereunder.
            2.9  Persons Deemed Owners.  Prior to due presentment of a Rights 
                 ---------------------
Certificate (or, prior to the Separation Time, the associated Common Stock 
certificate) for registration

                                 -26-
<PAGE>

of transfer, the Company, the Rights Agent and any agent of the Company or the 
Rights Agent may deem and treat the person in whose name such Rights 
Certificate (or, prior to the Separation Time, such Common Stock certificate) 
is registered as the absolute owner thereof and of the Rights evidenced thereby 
for all purposes whatsoever, including the payment of the Redemption Price, and 
neither the Company nor the Rights Agent shall be affected by any notice to the 
contrary.  As used in this Agreement, unless the context otherwise requires, 
the term "holder" of any Rights shall mean the registered holder of such Rights 
(or, prior to the Separation Time, the associated shares of Common Stock).
             2.10  Delivery and Cancellation of Certificates.  All Rights 
                   -----------------------------------------
Certificates surrendered upon exercise or for registration of transfer or 
exchange shall, if surrendered to any person other than the Rights Agent, be 
delivered to the Rights Agent and, in any case, shall be promptly cancelled by 
the Rights Agent.  The Company may at any time deliver to the Rights Agent for 
cancellation any Rights Certificates previously countersigned and delivered 
hereunder which the Company may have acquired in any manner whatsoever, and all 
Rights Certificates so delivered shall be promptly cancelled by the Rights 
Agent.  No Rights Certificates shall be countersigned in lieu of or in exchange 
for any Rights Certificates cancelled as provided in this Section 2.10, except 
as expressly permitted by this

                                 -27-
<PAGE>


Agreement.  The Rights Agent shall destroy all cancelled Rights Certificates 
and deliver a certificate of destruction to the Company.
            2.11  Agreement of Rights Holders.  Every holder of Rights, by 
                  ---------------------------
accepting the same, consents and agrees with the Company and the Rights Agent 
and with every other holder of Rights that:
            (a)  prior to the Separation Time, each Right will be transferable 
only together with, and will be transferred by a transfer of, the associated 
share of Common Stock;
            (b)  after the Separation Time, the Rights Certificates will be 
transferable only on the Rights Register as provided herein; 
            (c)  prior to due presentment of a Rights Certificate (or, prior to 
the Separation Time, the associated Common Stock certificate) for registration 
of transfer, the Company, the Rights Agent and any agent of the Company or the 
Rights Agent may deem and treat the person in whose name the Rights Certificate 
(or, prior to the Separation Time, the associated Common Stock certificate) is 
registered as the absolute owner thereof and of the Rights evidenced thereby 
for all purposes whatsoever, and neither the Company nor the Rights Agent shall 
be affected by any notice to the contrary;

                                 -28-
<PAGE>


            (d)  Rights beneficially owned by certain Persons will, under the 
circumstances set forth in Section 3.1(b), become void; and
            (e)  this Agreement may be supplemented or amended from time to 
time pursuant to Section 2.4(b) or 5.4 hereof.


                                ARTICLE III
                      ADJUSTMENTS TO THE RIGHTS IN 
                    THE EVENT OF CERTAIN TRANSACTIONS

            3.1  Flip-in.  (a)  In the event that prior to the Expiration Time 
                 -------
a Flip-in Date shall occur, then, to the extent applicable law permits Rights 
owned by certain Persons referred to in Section 3.1(b) to become void pursuant 
to the provisions thereof, except as provided in this Section 3.1, each Right 
shall constitute the right to purchase from the Company, upon exercise thereof 
in accordance with the terms hereof (but subject to Section 5.10), that number 
of shares of Common Stock having an aggregate Market Price on the Stock 
Acquisition Date equal to twice the Exercise Price for an amount in cash equal 
to the Exercise Price (such right to be appropriately adjusted in order to 
protect the interests of the holders of Rights generally in the event that on 
or after such Stock Acquisition Date an event of a type analogous to any of the 
events described in Section 2.4(a) or (b) shall have occurred with respect to 
the Common Stock).

                                 -29-
<PAGE>


            (b)  Notwithstanding the foregoing, to the extent permitted by 
applicable law, any Rights that are or were Beneficially Owned on or after the 
Stock Acquisition Date by an Acquiring Person or an Affiliate or Associate 
thereof or by any transferee, direct or indirect, of any of the foregoing shall 
become void and any holder of such Rights (including transferees) shall 
thereafter have no right to exercise or transfer such Rights under any 
provision of this Agreement.  If any Rights Certificate is presented for 
assignment or exercise and the Person presenting the same will not complete the 
certification set forth at the end of the form of assignment or notice of 
election to exercise and provide such additional evidence of the identity of 
the Beneficial Owner and its Affiliates and Associates (or former Beneficial 
Owners and their Affiliates and Associates) as the Company shall reasonably 
request, then the Company shall be entitled conclusively to deem the Beneficial 
Owner thereof to be an Acquiring Person or an Affiliate or Associate thereof or 
a transferee of any of the foregoing and accordingly will, to the extent 
permitted by applicable law, deem the Rights evidenced thereby to be void and 
not transferable or exercisable.
            (c)  The Board of Directors of the Company may, at its option, at 
any time after a Flip-in Date and prior to the time that an Acquiring Person 
becomes the Beneficial Owner of more than 50% of the outstanding shares of 
Common

                                 -30-
<PAGE>


Stock, but only to the extent applicable law permits Rights owned by certain 
Persons referred to in Section 3.1(b) to become void pursuant to the provisions 
thereof, elect to exchange all (but not less than all) the then outstanding 
Rights (which shall not include Rights that have become void pursuant to the 
provisions of Section 3.1(b)) for shares of Common Stock at an exchange ratio 
of one share of Common Stock per Right, appropriately adjusted in order to 
protect the interests of holders of Rights generally in the event that after 
the Separation Time an event of a type analogous to any of the events described 
in Section 2.4(a) or (b) shall have occurred with respect to the Common Stock 
(such exchange ratio, as adjusted from time to time, being hereinafter referred 
to as the "Exchange Ratio").
            Immediately upon the action of the Board of Directors of the 
Company electing to exchange the Rights, without any further action and without 
any notice, the right to exercise the Rights will terminate and each Right 
(other than Rights that have become void pursuant to Section 3.1(b)) will 
thereafter represent only the right to receive a number of shares of Common 
Stock equal to the Exchange Ratio.  Promptly after the action of the Board of 
Directors electing to exchange the Rights, the Company shall give notice 
thereof (specifying the steps to be taken to receive shares of Common Stock in 
exchange for Rights) to the Rights Agent and the holders of the Rights (other 
than Rights that

                                 -31-
<PAGE>

have become void pursuant to Section 3.1(b)) outstanding immediately prior 
thereto by mailing such notice in accordance with Section 5.9.
            Each Person in whose name any certificate for shares is issued upon 
the exchange of Rights pursuant to this Section 3.1(c) or Section 3.1(d) shall 
for all purposes be deemed to have become the holder of record of the shares 
represented thereby on, and such certificate shall be dated, the date upon 
which the Rights Certificate evidencing such Rights was duly surrendered and 
payment of any applicable taxes and other governmental charges payable by the 
holder was made; provided, however, that if the date of such surrender and 
                 --------  -------
payment is a date upon which the stock 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 stock transfer books of the Company are open.
            (d)  Whenever the Company shall become obligated under Section 
3.1(a) or (c) to issue shares of Common Stock upon exercise of or in exchange 
for Rights, the Company, at its option, may substitute therefor shares of 
Preferred Stock, at a ratio of one one-hundredth of a share of Preferred Stock 
for each share of Common Stock so issuable.
            (e)  In the event that there shall not be sufficient treasury 
shares or authorized but unissued shares of

                                 -32-
<PAGE>


Common Stock or Preferred Stock of the Company to permit the exercise or 
exchange in full of the Rights in accordance with Section 3.1(a) or (c), and 
the Company elects not to, or is otherwise unable to, make the exchange 
referred to in Section 3.1(c), the Company shall either (i) call a meeting of 
shareholders seeking approval to cause sufficient additional shares to be 
authorized (provided that if such approval is not obtained the Company will 
take the action specified in clause (ii) of this sentence) or (ii) take such 
action as shall be necessary to ensure and provide, to the extent permitted by 
applicable law and any agreements or instruments in effect on the Stock 
Acquisition Date to which it is a party, that each Right shall thereafter 
constitute the right to receive, (x) at the Company's option, either (A) in 
return for the Exercise Price, debt or equity securities or other assets (or a 
combination thereof) having a fair value equal to twice the Exercise Price, or 
(B) without payment of consideration (except as otherwise required by 
applicable law), debt or equity securities or other assets (or a combination 
thereof) having a fair value equal to the Exercise Price, or (y) if the Board 
of Directors of the Company elects to exchange the Rights in accordance with 
Section 3.1(c), debt or equity securities or other assets (or a combination 
thereof) having a fair value equal to the product of the Market Price of a 
share of Common Stock on the Flip-in Date times the Exchange Ratio in

                                 -33-
<PAGE>


effect on the Flip-in Date, where in any case set forth in (x) or (y) above 
the fair value of such debt or equity securities or other assets shall be as 
determined in good faith by the Board of Directors of the Company, after 
consultation with a nationally recognized investment banking firm.  
            3.2  Flip-over.  (a) Prior to the Expiration Time, the Company 
                 ---------
shall not enter into any agreement with respect to, consummate or permit to 
occur any Flip-over Transaction or Event unless and until it shall have entered 
into a supplemental agreement with the Flip-over Entity, for the benefit of the 
holders of the Rights, providing that, upon consummation or occurrence of the 
Flip-over Transaction or Event (i) each Right shall thereafter constitute the 
right to purchase from the Flip-over Entity, upon exercise thereof in accor-
dance with the terms hereof, that number of shares of Flip-over Stock of the 
Flip-over Entity having an aggregate Market Price on the date of consummation 
or occurrence of such Flip-over Transaction or Event equal to twice the 
Exercise Price for an amount in cash equal to the Exercise Price (such right to 
be appropriately adjusted in order to protect the interests of the holders of 
Rights generally in the event that after such date of consummation or 
occurrence an event of a type analogous to any of the events described in 
Section 2.4(a) or (b) shall have occurred with respect to the Flip-over Stock) 
and (ii) the

                                 -34-
<PAGE>


Flip-over Entity shall thereafter be liable for, and shall assume, by virtue 
of such Flip-over Transaction or Event and such supplemental agreement, all the 
obligations and duties of the Company pursuant to this Agreement.  The 
provisions of this Section 3.2 shall apply to successive Flip-over Transactions 
or Events.
            (b)  Prior to the Expiration Time, unless the Rights will be 
redeemed pursuant to  Section 5.1 hereof in connection therewith, the Company 
shall not enter into any agreement with respect to, consummate or permit to 
occur any Flip-over Transaction or Event if at the time thereof there are any 
rights, warrants or securities outstanding or any other arrangements, 
agreements or instruments that would eliminate or otherwise diminish in any 
material respect the benefits intended to be afforded by this Rights Agreement 
to the holders of Rights upon consummation of such transaction.


                                ARTICLE IV
                             THE RIGHTS AGENT

            4.1  General.  (a)  The Company hereby appoints the Rights Agent to 
                 -------
act as agent for the Company in accordance with the terms and conditions 
hereof, and the Rights Agent hereby accepts such appointment.  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

                                 -35-
<PAGE>


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 to be done 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.
            (b)  The Rights Agent shall be protected and shall incur no 
liability for or in respect of any action taken, suffered or omitted by it in 
connection with its administration of this Agreement in reliance upon any 
certificate for securities purchasable upon exercise of Rights, Rights 
Certificate, certificate 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.
            4.2  Merger or Consolidation or Change of Name of Rights Agent.  
                 ---------------------------------------------------------
(a)  Any corporation into which the Rights Agent or any successor Rights Agent 
may be merged or with which it may be consolidated, or any corporation 
resulting from any merger or consolidation to which the Rights Agent

                                 -36-
<PAGE>


or any successor Rights Agent is a party, or any corporation succeeding to the 
shareholder services business of the Rights Agent or any successor Rights 
Agent, will 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 4.4 
hereof.  In case at the time such successor Rights Agent succeeds to the agency 
created by this Agreement any of the Rights Certificates have been 
countersigned but not delivered, any such successor Rights Agent may adopt the 
countersignature of the predecessor Rights Agent and deliver such Rights 
Certificates so countersigned; and in case at that time any of the Rights 
Certificates have not been countersigned, any successor Rights Agent may 
countersign such Rights 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 Rights Certificates will have the full force provided in the Rights 
Certificates and in this Agreement.
            (b)  In case at any time the name of the Rights Agent is changed 
and at such time any of the Rights Certificates shall have been countersigned 
but not delivered, the Rights Agent may adopt the countersignature under its 
prior name and deliver Rights Certificates so countersigned; and in case at 
that time any of the Rights Certificates shall

                                 -37-
<PAGE>


not have been countersigned, the Rights Agent may countersign such Rights 
Certificates either in its prior name or in its changed name; and in all such 
cases such Rights Certificates shall have the full force provided in the Rights 
Certificates and in this Agreement.
            4.3  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 Rights Certificates, 
by their acceptance thereof, shall be bound:
            (a)  The Rights Agent may consult with legal counsel (who may be 
legal counsel for the Company), and the opinion of such counsel will 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 deems 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 a person believed by the Rights Agent to 
be the Senior Chairman of the Board, the Chairman of the Board, the President 
or any Vice President and by the Treasurer or any

                                 -38-
<PAGE>


Assistant Treasurer or the Secretary or any Assistant Secretary of the Company 
and delivered to the Rights Agent; and such certificate will 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 will be liable hereunder only for its own 
negligence, bad faith or willful misconduct.
            (d)  The Rights Agent will not be liable for or by reason of any of 
the statements of fact or recitals contained in this Agreement or in the 
certificates for securities purchasable upon exercise of Rights or the Rights 
Certificates (except its countersignature thereof) or be required to verify the 
same, but all such statements and recitals are and will be deemed to have been 
made by the Company only.
            (e)  The Rights Agent will not be under any responsibility in 
respect of the validity of this Agreement or the execution and delivery hereof 
(except the due authorization, execution and delivery hereof by the Rights 
Agent) or in respect of the validity or execution of any certificate for 
securities purchasable upon exercise of Rights or Rights Certificate (except 
its countersignature thereof); nor will it be responsible for any breach by the 
Company of any covenant or condition contained in this Agreement or in 

                                 -39-
<PAGE>


any Rights Certificate; nor will it be responsible for any change in the 
exercisability of the Rights (including the Rights becoming void pursuant to 
Section 3.1(b) hereof) or any adjustment required under the provisions of 
Section 2.4, 3.1 or 3.2 hereof or responsible for the manner, method or amount 
of any such adjustment or the ascertaining of the existence of facts that would 
require any such adjustment (except with respect to the exercise of Rights 
after receipt of the certificate contemplated by Section 2.4 describing any 
such adjustment); nor will it by any act hereunder be deemed to make any 
representation or warranty as to the authorization or reservation of any 
securities purchasable upon exercise of Rights or any Rights or as to whether 
any securities purchasable upon exercise of Rights will, when issued, be duly 
and validly authorized, executed, issued and delivered and 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 
person believed by

                                 -40-
<PAGE>


the Rights Agent to be the Senior Chairman of the Board, the Chairman of the 
Board, the President or any Vice President or the Secretary or any Assistant 
Secretary or the Treasurer or any Assistant Treasurer of the Company, and to 
apply to such persons 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 accordance with instructions of any such person.
            (h)  The Rights Agent and any shareholder, director, officer or 
employee of the Rights Agent may buy, sell or deal in Common Stock, 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 will 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,

                                 -41-
<PAGE>


provided reasonable care was exercised in the selection and continued 
employment thereof.
            4.4  Change of Rights Agent.  The Rights Agent may resign and be 
                 ----------------------
discharged from its duties under this Agreement upon 90 days' notice (or such 
lesser notice as is acceptable to the Company) in writing mailed to the Company 
and to each transfer agent of Common Stock by registered or certified mail, and 
to the holders of the Rights in accordance with Section 5.9.  The Company may 
remove the Rights Agent upon 30 days' notice in writing, mailed to the Rights 
Agent and to each transfer agent of the Common Stock by registered or certified 
mail, and to the holders of the Rights in accordance with Section 5.9.  If the 
Rights Agent should resign or be removed or otherwise become incapable of 
acting, the Company will appoint a successor to the Rights Agent.  If the 
Company fails to make such appointment within a period of 30 days after 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 
any Rights (which holder shall, with such notice, submit such holder's Rights 
Certificate for inspection by the Company), then the holder of any Rights 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 corporation organized and doing business under the 
laws of the United

                                 -42-
<PAGE>


States or of the State of Texas or any other state of the United States, in 
good standing, which is authorized under such laws to exercise the powers of 
the Rights Agent contemplated by this Agreement and is subject to supervision 
or examination by federal or state authority and which has at the time of its 
appointment as Rights Agent a combined capital and surplus of at least 
$50,000,000.  After appointment, the successor Rights Agent will 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 will file 
notice thereof in writing with the predecessor Rights Agent and each transfer 
agent of the Common Stock, and mail a notice thereof in writing to the holders 
of the Rights.  Failure to give any notice provided for in this Section 4.4, 
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.

                                 -43-
<PAGE>


                                ARTICLE V 
                              MISCELLANEOUS


            5.1  Redemption.  (a)  The Board of Directors of the Company may, 
                 ----------
at its option, at any time prior to the close of business on the Flip-in Date, 
elect to redeem all (but not less than all) the then outstanding Rights at the 
Redemption Price and the Company, at its option, may pay the Redemption Price 
either in cash or shares of Common Stock or other securities of the Company 
deemed by the Board of Directors, in the exercise of its sole discretion, to be 
at least equivalent in value to the Redemption Price.
            (b)  Immediately upon the action of the Board of Directors of the 
Company electing to redeem the Rights (or, if the resolution of the Board of 
Directors electing to redeem the Rights states that the redemption will not be 
effective until the occurrence of a specified future time or event, upon the 
occurrence of such future time or event), without any further action and 
without any notice, the right to exercise the Rights will terminate and each 
Right will thereafter represent only the right to receive the Redemption Price 
in cash or securities, as determined by the Board of Directors.  Promptly after 
the Rights are redeemed, the Company shall give notice of such redemption to 
the Rights Agent and the holders of the then outstanding Rights by mailing such 
notice in accordance with Section 5.9.

                                 -44-
<PAGE>


            5.2  Expiration.  The Rights and this Agreement shall expire at the 
                 ----------
Expiration Time and no Person shall have any rights pursuant to this Agreement 
or any Right after the Expiration Time, except, if the Rights are exchanged or 
redeemed, as provided in Section 3.1 or 5.1 hereof.
            5.3  Issuance of New Rights Certificates.  Notwithstanding any of 
                 -----------------------------------
the provisions of this Agreement or of the Rights to the contrary, the Company 
may, at its option, issue new Rights Certificates evidencing Rights in such 
form as may be approved by its Board of Directors to reflect any adjustment or 
change in the number or kind or class of shares of stock purchasable upon 
exercise of Rights made in accordance with the provisions of this Agreement.  
In addition, in connection with the issuance or sale of shares of Common Stock 
by the Company following the Separation Time and prior to the Expiration Time 
pursuant to the terms of securities convertible or redeemable into shares of 
Common Stock or to options, in each case issued or granted prior to, and 
outstanding at, the Separation Time, the Company shall issue to the holders of 
such shares of Common Stock, Rights Certificates representing the appropriate 
number of Rights in connection with the issuance or sale of such shares of 
Common Stock; provided, however, in each case, (i) no such Rights Certificate 
              --------  -------
shall be issued, if, and to the extent that, the Company shall be advised by 
counsel that such issuance would create a significant risk of material

                                 -45-
<PAGE>


adverse tax consequences to the Company or to the Person to whom such Rights 
Certificates would be issued, (ii) no such Rights Certificates shall be issued 
if, and to the extent that, appropriate adjustment shall have otherwise been 
made in lieu of the issuance thereof, and (iii) the Company shall have no 
obligation to distribute Rights Certificates to any Acquiring Person or 
Affiliate or Associate of an Acquiring Person or any transferee of any of the 
foregoing.
            5.4  Supplements and Amendments.  The Company and the Rights Agent 
                 --------------------------
may from time to time supplement or amend this Agreement without the approval 
of any holders of Rights (i) in any respect prior to the Flip-in Date (other 
than to change the Redemption Price or the Expiration Time, except as 
contemplated elsewhere herein), (ii) to make any changes following the close of 
business on the Flip-in Date which the Company may deem necessary or desirable 
and which shall not materially adversely affect the interests of the holders of 
Rights generally or (iii) in order to cure any ambiguity or to correct or 
supplement any provision contained herein which may be inconsistent with any 
other provisions herein or otherwise defective.  The Rights Agent will duly 
execute and deliver any supplement or amendment hereto requested by the Company 
which satisfies the terms of the preceding sentence.
            5.5  Fractional Shares.  If the Company elects not to issue 
                 -----------------
certificates representing fractional shares upon

                                 -46-
<PAGE>


exercise or redemption of Rights, the Company shall, in lieu thereof, in the 
sole discretion of the Board of Directors, either (a) evidence such fractional 
shares by depositary receipts issued pursuant to an appropriate agreement 
between the Company and a depositary selected by it, providing that each holder 
of a depositary receipt shall have all of the rights, privileges and pre-
ferences to which such holder would be entitled as a beneficial owner of such 
fractional share, or (b) pay to the registered holder of such Rights the 
appropriate fraction of the Market Price per share.
            5.6  Rights of Action.  Subject to the terms of this Agreement 
                 ----------------
(including Section 3.1(b)), rights of action in respect of this Agreement, 
other than rights of action vested solely in the Rights Agent, are vested in 
the respective holders of the Rights; and any holder of any Rights, without the 
consent of the Rights Agent or of the holder of any other Rights, may, on such 
holder's own behalf and for such holder's own benefit and the benefit of other 
holders of Rights, 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 such holder's Rights in the manner provided in such 
holder's Rights Certificate and in this Agreement.  Without limiting the 
foregoing or any remedies available to the holders of Rights, it is 
specifically acknowledged that the holders of Rights would not have an adequate 
remedy at law for any

                                 -47-
<PAGE>


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.
            5.7  Holder of Rights Not Deemed a Shareholder.  No holder, as 
                 -----------------------------------------
such, of any Rights shall be entitled to vote, receive dividends or be deemed 
for any purpose the holder of shares or any other securities which may at any 
time be issuable on the exercise of such Rights, nor shall anything contained 
herein or in any Rights Certificate be construed to confer upon the holder of 
any Rights, as such, any of the rights of a shareholder of the Company or any 
right to vote for the election of directors or upon any matter submitted to 
shareholders at any meeting thereof, or to give or withhold consent to any 
corporate action, or to receive notice of meetings or other actions affecting 
shareholders (except as provided in Section 5.8 hereof), or to receive 
dividends or subscription rights, or otherwise, until such Rights shall have 
been exercised or exchanged in accordance with the provisions hereof.
            5.8  Notice of Proposed Actions.  In case the Company shall propose 
                 --------------------------
after the Separation Time and prior to the Expiration Time (i) to effect or 
permit a Flip-over Transaction or Event or (ii) to effect the liquidation, 
dissolution or winding up of the Company, then, in each such case, the Company 
shall give to each holder of a Right, in

                                 -48-
<PAGE>


accordance with Section 5.9 hereof, a notice of such proposed action, which 
shall specify the date on which such Flip-over Transaction or Event, 
liquidation, dissolution, or winding up is to take place, and such notice shall 
be so given at least 20 Business Days prior to the date of the taking of such 
proposed action.  
            5.9  Notices.  Notices or demands authorized or required by this 
                 -------
Agreement to be given or made by the Rights Agent or by the holder of any 
Rights to or on the Company shall be sufficiently given or made if delivered or 
sent by first-class mail, postage prepaid, addressed (until another address is 
filed in writing with the Rights Agent) as follows:

                  Cullen/Frost Bankers, Inc.
                  P.O. Box 1600
                  100 West Houston Street
                  San Antonio, Texas  78296

                  Attention: Chief Financial Officer

Any notice or demand authorized or required by this Agreement to be given or 
made by the Company or by the holder of any Rights to or on the Rights Agent 
shall be sufficiently given or made if delivered or sent by first-class mail, 
postage prepaid, addressed (until another address is filed in writing with the 
Company) as follows:

                  The Frost National Bank
                  100 West Houston Street
                  4th Floor
                  San Antonio, Texas  78205

                                 -49-
<PAGE>


Notices or demands authorized or required by this Agreement to be given or made 
by the Company or the Rights Agent to or on the holder of any Rights shall be 
sufficiently given or made if delivered or sent by first-class mail, postage 
prepaid, addressed to such holder at the address of such holder as it appears 
upon the registry books of the Rights Agent or, prior to the Separation Time, 
on the registry books of the transfer agent for the Common Stock.  Any notice 
which is mailed in the manner herein provided shall be deemed given, whether or 
not the holder receives the notice.
            5.10  Suspension of Exercisability.  To the extent that the Company 
                  ----------------------------
determines in good faith that some action will or need be taken pursuant to 
Section 3.1 or to comply with federal or state securities laws, the Company may 
suspend the exercisability of the Rights for a reasonable period in order to 
take such action or comply with such laws.  In the event of any such 
suspension, the Company shall issue as promptly as practicable a public 
announcement stating that the exercisability or exchangeability of the Rights 
has been temporarily suspended.  Notice thereof pursuant to Section 5.9 shall 
not be required.
            Failure to give a notice pursuant to the provisions of this 
Agreement shall not affect the validity of any action taken hereunder.

                                 -50-
<PAGE>


            5.11  Costs of Enforcement.  The Company agrees that if the Company 
                  --------------------
or any other Person the securities of which are purchasable upon exercise of 
Rights fails to fulfill any of its obligations pursuant to this Agreement, then 
the Company or such Person will reimburse the holder of any Rights for the 
costs and expenses (including legal fees) incurred by such holder in actions to 
enforce such holder's rights pursuant to any Rights or this Agreement.
            5.12  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.
            5.13  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 holders of the Rights any legal or equitable right, remedy or claim 
under this Agreement and this Agreement shall be for the sole and exclusive 
benefit of the Company, the Rights Agent and the holders of the Rights.
            5.14  Determination and Actions by the Board of Directors, etc.  
                  --------------------------------------------------------- 
The Board of Directors of the Company shall have the exclusive power and 
authority to administer this Agreement and to exercise all rights and powers 
specifically granted to the Board or to the Company, or as may be necessary or 
advisable in the administration of this Agreement, including, without 
limitation, the right and

                                 -51-
<PAGE>


power to (i) interpret the provisions of this Agreement and (ii) make all 
determinations deemed necessary or advisable for the administration of this 
Agreement.  All such actions, calculations, interpretations and determinations 
(including, for purposes of clause (y) below, all omissions with respect to the 
foregoing) which are done or made by the Board in good faith, shall (x) be 
final, conclusive and binding on the Company, the Rights Agent, the holders of 
the Rights and all other parties, and (y) not subject the Board of Directors of 
the Company to any liability to the holders of the Rights.
            5.15  Descriptive Headings.  Descriptive headings appear herein for 
                  --------------------
convenience only and shall not control or affect the meaning or construction of 
any of the provisions hereof.
            5.16  Governing Law.  THIS AGREEMENT AND EACH RIGHT ISSUED 
                  -------------
HEREUNDER SHALL BE DEEMED TO BE A CONTRACT MADE UNDER THE LAWS OF THE STATE OF 
TEXAS AND FOR ALL PURPOSES SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE 
WITH THE LAWS OF SUCH STATE APPLICABLE TO CONTRACTS TO BE MADE AND PERFORMED 
ENTIRELY WITHIN SUCH STATE.
            5.17  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.

                                 -52-
<PAGE>


            5.18  Severability.  If any term or provision hereof or the 
                  ------------
application thereof to any circumstance shall, in any jurisdiction and to any 
extent, be invalid or unenforceable, such term or provision shall be 
ineffective as to such jurisdiction to the extent of such invalidity or 
unenforceability without invalidating or rendering unenforceable the remaining 
terms and provisions hereof or the application of such term or provision to 
circumstances other than those as to which it is held invalid or unenforceable.

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

                                    CULLEN/FROST BANKERS, INC.



                                    By:_________________________
                                       Name:
                                       Title:


                                    THE FROST NATIONAL BANK



                                    By:_________________________
                                       Name:
                                       Title:


                                 -53-
 

 




                                                             Exhibit 2



       Form of Rights Certificate and of Election to Exercise, included
       as Exhibit A to the Restated Rights Agreement (Exhibit 1 hereto).


<PAGE>


05 89-5P                                                     EXHIBIT A
                                                             ---------
                   [Form of Rights Certificate]

Certificate No. W-                              _______ Rights

THE RIGHTS ARE SUBJECT TO REDEMPTION OR MANDATORY EXCHANGE, AT THE OPTION OF 
THE COMPANY, ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT.  TO THE EXTENT 
PERMITTED BY APPLICABLE LAW, RIGHTS BENEFICIALLY OWNED BY ACQUIRING PERSONS OR 
AFFILIATES OR ASSOCIATES THEREOF (AS SUCH TERMS ARE DEFINED IN THE RIGHTS 
AGREEMENT) OR TRANSFEREES OF ANY OF THE FOREGOING WILL BE VOID.

                           Rights Certificate


                       CULLEN/FROST BANKERS, INC.

            This certifies that ____________________, or registered assigns, is 
the registered holder of the number of Rights set forth above, each of which 
entitles the registered holder thereof, subject to the terms, provisions and 
conditions of the Amended and Restated Shareholder Protection Rights Agreement, 
dated as of July 30, 1996 (as amended from time to time, the "Rights 
Agreement"), between Cullen/Frost Bankers, Inc., a Texas corporation (the 
"Company"), and The Frost National Bank, as Rights Agent (the "Rights Agent", 
which term shall include any successor Rights Agent under the Rights 
Agreement), to purchase from the Company at any time after the Separation Time 
(as such term is defined in the Rights Agreement) and prior to the close of 
business on July 25, 1999, one one-hundredth of a fully paid share of Junior 
Participating Preferred Stock, par value $5.00 per share (the "Preferred 
Stock"), of the Company (subject to adjustment as provided in the Rights 
Agreement) at the Exercise Price referred to below, upon 

<PAGE>


presentation and surrender of this Rights Certificate with the Form of Election 
to Exercise duly executed at the principal office of the Rights Agent in San 
Antonio.  The Exercise Price shall initially be $100 per Right and shall be 
subject to adjustment in certain events as provided in the Rights Agreement.  
            In certain circumstances described in the Rights Agreement, the 
Rights evidenced hereby may entitle the registered holder thereof to purchase 
securities of an entity other than the Company or securities or assets of the 
Company other than Preferred Stock, all as provided in the Rights Agreement.
            This Rights Certificate is subject to all of the terms, provisions 
and conditions of the Rights Agreement, which terms, provisions and conditions 
are hereby incorporated herein by reference and made a part hereof and to which 
Rights Agreement reference is hereby made for a full description of the rights, 
limitations of rights, obligations, duties and immunities hereunder of the 
Rights Agent, the Company and the holders of the Rights Certificates.  Copies 
of the Rights Agreement are on file at the principal office of the Company and 
are available without cost upon written request.
            This Rights Certificate, with or without other Rights Certificates, 
upon surrender at the office of the Rights Agent designated for such purpose, 
may be exchanged

                                  -2-
<PAGE>


for another Rights Certificate or Rights Certificates of like tenor evidencing 
an aggregate number of Rights equal to the aggregate number of Rights evidenced 
by the Rights Certificate or Rights Certificates surrendered.  If this Rights 
Certificate shall be exercised in part, the registered holder shall be entitled 
to receive, upon surrender hereof, another Rights Certificate or Rights 
Certificates for the number of whole Rights not exercised.
            Subject to the provisions of the Rights Agreement, each Right 
evidenced by this Certificate may be (a) redeemed by the Company under certain 
circumstances, at its option, at a redemption price of $0.01 per Right or (b) 
exchanged by the Company under certain circumstances, at its option, for one 
share of Common Stock or one one-hundredth of a share of Preferred Stock per 
Right (or, in certain cases, other securities or assets of the Company), 
subject in each case to adjustment in certain events as provided in the Rights 
Agreement.
            No holder of this Rights Certificate, as such, shall be entitled to 
vote or receive dividends or be deemed for any purpose the holder of any 
securities which may at any time be issuable on the exercise hereof, nor shall 
anything contained in the Rights Agreement or herein be construed to confer 
upon the holder hereof, as such, any of the rights of a shareholder of the 
Company or any right to vote for the election of directors or upon any matter

                                  -3-
<PAGE>


submitted to shareholders at any meeting thereof, or to give or withhold 
consent to any corporate action, or to receive notice of meetings or other 
actions affecting shareholders (except as provided in the Rights Agreement), or 
to receive dividends or subscription rights, or otherwise, until the Rights 
evidenced by this Rights Certificate shall have been exercised or exchanged as 
provided in the Rights Agreement.
            This Rights Certificate shall not be valid or obligatory for any 
purpose until it shall have been countersigned by the Rights Agent.
            WITNESS the facsimile signature of the proper officers of the 
Company and its corporate seal.

Date:  ____________


ATTEST:                       CULLEN/FROST BANKERS, INC.



___________________________   By______________________
       Secretary


Countersigned:

THE FROST NATIONAL BANK



By____________________________
   Authorized Signature 


                                  -4-

<PAGE>



                      [To be attached to each Rights Certificate]

                            FORM OF ELECTION TO EXERCISE

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

TO:  Cullen/Frost Bankers, Inc.

            The undersigned hereby irrevocably elects to exercise 
_______________________ whole Rights represented by the attached Rights 
Certificate to purchase the shares of Junior Participating Preferred Stock 
issuable upon the exercise of such Rights and requests that certificates for 
such shares be issued in the name of:
            ___________________________________
            Address:___________________________
            ___________________________________
            Social Security or Other Taxpayer
            Identification Number:_____________

If such number of Rights shall not be all the Rights evidenced by this Rights 
Certificate, a new Rights Certificate for the balance of such Rights shall be 
registered in the name of and delivered to:
            ___________________________________
            Address:___________________________
            ___________________________________
            Social Security or Other Taxpayer
            Identification Number:_____________

Dated:  _______________, 19__



Signature Guaranteed:                    _________________________
                                         Signature
                                         (Signature must correspond to name as 
                                         written upon the face of the attached 
                                         Rights Certificate in every 
                                         particular, without alteration or 
                                         enlargement or any change whatsoever)

<PAGE>



            Signatures must be guaranteed by an eligible guarantor institution 
(banks, stockbrokers, savings and loan associations and credit unions with 
membership in an approved signature guarantee Medallion program), pursuant to 
SEC Rule 17Ad-15.



- -------------------------------------------------------------------------------
                            (To be completed if true)



            The undersigned hereby represents, for the benefit of all holders 
of Rights and shares of Common Stock, that the Rights evidenced by the attached 
Rights Certificate are not, and, to the knowledge of the undersigned, have 
never been, Beneficially Owned by an Acquiring Person or an Affiliate or 
Associate thereof (as defined in the Rights Agreement).


                                                      _________________________
                                                      Signature



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


                                     NOTICE

            In the event the certification set forth above is not completed in 
connection with a purported exercise, the Company will deem the Beneficial 
Owner of the Rights evidenced by the attached Rights Certificate to be an 
Acquiring Person or an Affiliate or Associate thereof (as defined in the Rights 
Agreement) or a transferee of any of the foregoing and accordingly will deem 
the Rights evidenced by such Rights Certificate to be void and not transferable 
or exercisable.


                                  -2-

 

 




                                                               Exhibit 3


        Form of Statement of Resolution Establishing Series of Shares of
         Participating Junior Preferred Stock, included as Exhibit B to 
               the Restated Rights Agreement (Exhibit 1 hereto).


<PAGE>

                                                               EXHIBIT B

                        STATEMENT OF RESOLUTION
                    ESTABLISHING A SERIES OF SHARES
                    -------------------------------

To the Secretary of State
  of the State of Texas:

            Pursuant to the provisions of Article 2.13 of the Texas Business 
Corporation Act, the undersigned submits the following statement for the 
purpose of establishing and designating a series of shares and fixing and 
determining the relative rights and preferences thereof:
            1.  The name of the corporation is Cullen/Frost Bankers, Inc., a 
Texas corporation (the "Corporation").
            2.  The following resolution, establishing and designating a series 
of shares and fixing and determining the relative rights and preferences 
thereof, was duly adopted by the Board of Directors of the Corporation on July 
30, 1996:

          RESOLVED, that there is hereby established a series of Junior 
      Preferred Stock, par value $5.00 per share, of the Corporation, and the 
      designation and certain powers, preferences and other rights of the 
      shares of such series, and certain qualifications, limitations and 
      restrictions thereon, are hereby fixed as follows:

                    (i)  The distinctive serial designation of this series 
          shall be "Junior Participating Preferred Stock" (hereinafter called 
          "this Series").  Each share of this Series shall be identical in 
          all respects with the other shares of this Series except as to the 
          dates from and after which dividends thereon shall be cumulative.

                    (ii)  The number of shares in this Series shall initially 
          be 250,000, which number may from time to time be increased or 
          decreased (but not below the number then outstanding) by the Board of

<PAGE>


          Directors.  Shares of this Series purchased by the Corporation shall 
          be cancelled and shall revert to authorized but unissued shares of 
          Preferred Stock undesignated as to series.  Shares of this Series may 
          be issued in fractional shares, which fractional shares shall, 
          entitle the holder, in proportion to such holder's fractional share, 
          to all rights of a holder of a whole share of this Series.

                    (iii)  The holders of full or fractional shares of this 
          Series shall be entitled to receive, when and as declared by the 
          Board of Directors, but only out of funds legally available therefor, 
          dividends, (A) on each date that dividends or other distributions 
          (other than dividends or distributions payable in Common Stock of the 
          Corporation) are payable on or in respect of Common Stock comprising 
          part of the Reference Package (as defined below), in an amount per 
          whole share of this Series equal to the aggregate amount of dividends 
          or other distributions (other than dividends or distributions payable 
          in Common Stock of the Corporation) that would be payable on such 
          date to a holder of the Reference Package and (B) on the last day of 
          March, June, September and December in each year, in an amount per 
          whole share of this Series equal to the excess (if any) of $25.00 
          over the aggregate dividends paid per whole share of this Series 
          during the three month period ending on such last day.  Each such 
          dividend shall be paid to the holders of record of shares of this 
          Series on the date, not exceeding sixty days preceding such dividend 
          or distribution payment date, fixed for the purpose by the Board of 
          Directors in advance of payment of each particular dividend or 
          distribution.  Dividends on each full and each fractional share of 
          this Series shall be cumulative from the date such full or fractional 
          share is originally issued; provided that any such full or fractional 
          share originally issued after a dividend record date and on or prior 
          to the dividend payment date to which such record date relates shall 
          not be entitled to receive the dividend payable on such dividend 
          payment date or any amount in respect of the period from such 
          original issuance to such dividend payment date.

                           The term "Reference Package" shall initially mean 
          100 shares of Common Stock, par

                                  -2-
<PAGE>

          value $5.00 per share ("Common Stock"), of the Corporation.  In the 
          event the Corporation shall at any time after the close of business 
          on _____________, 19___* (A) declare or pay a dividend on any Common 
          Stock payable in Common Stock, (B) subdivide any Common Stock or (C) 
          combine any Common Stock into a smaller number of shares, then and in 
          each such case the Reference Package after such event shall be the 
          Common Stock that a holder of the Reference Package immediately prior 
          to such event would hold thereafter as a result thereof.

                           Holders of shares of this Series shall not be 
          entitled to any dividends, whether payable in cash, property or 
          stock, in excess of full cumulative dividends, as herein provided on 
          this Series.

                           So long as any shares of this Series are 
          outstanding, no dividend (other than a dividend in Common Stock or in 
          any other stock ranking junior to this Series as to dividends and 
          upon liquidation) shall be declared or paid or set aside for payment 
          or other distribution declared or made upon the Common Stock or upon 
          any other stock ranking junior to this Series as to dividends or upon 
          liquidation, nor shall any Common Stock nor any other stock of the 
          Corporation ranking junior to or on a parity with this Series as to 
          dividends or upon liquidation be redeemed, purchased or otherwise 
          acquired for any consideration (or any moneys be paid to or made 
          available for a sinking fund for the redemption of any shares of any 
          such stock) by the Corporation (except by conversion into or exchange 
          for stock of the Corporation ranking junior to this Series as to 
          dividends and upon liquidation), unless, in each case, the full 
          cumulative dividends (including the dividend to be due upon payment 
          of such dividend, distribution, redemption, purchase or other 
          acquisition) on all outstanding shares of


______________________
*     For a certificate of designation relating to shares to be issued pursuant 
      to Section 2.3 of the Rights Agreement, insert the Separation Time.  For 
      a certificate designation relating to shares to be issued pursuant to 
      Section 3.1 (d) of the Rights Agreement, insert the Flip-in Date.

                                  -3-
<PAGE>


           this Series shall have been, or shall contemporaneously be, paid.

                     (iv)  In the event of any merger, consolidation, 
           reclassification 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 the shares of
           this Series shall at the same time be similarly exchange or changed
           in any amount per whole share equal to the aggregate amount of stock,
           securities, cash and/or any other property (payable in kind), as the
           case may be, that a holder of the Reference Package would be entitled
           to receive as a result of such transaction.

                      (v)  In the event of any liquidation, dissolution or 
           winding up of the affairs of the Corporation, whether voluntary or 
           involuntary, the holders of full and fractional shares of this Series
           shall be entitled, before any distribution or payment is made on any
           date to the holder of the Common Stock or any other stock of the
           Corporation ranking junior to this Series upon liquidation, to be
           paid in full an amount per whole share of this Series equal to the
           greater of (A) $___________*or (B) the aggregate amount distributed
           or to be distributed prior to such date in connection with such
           liquidation, dissolution or winding up to a holder of the Reference
           Package (such greater amount being hereinafter referred to as the
           "Liquidation Preference"), together with accrued dividends to such
           distribution or payment date, whether or not earned or declared.  If
           such payment shall have been made in full to all holders of shares of
           this Series, the holders of shares of this Series as such shall have
           no right or claim to any of the remaining assets of the Corporation.

                     This Series shall be subordinate to, and shall be entitled 
           to a distribution upon liquidation after, all series of Preferred
           Stock of the Corporation except for such Series as by its terms ranks
           pari passu with, or subordinate to, this Series.


_______________________
*       Insert an amount equal to 100 times the Exercise Price in effect as of 
        the Separation Time.

                                  -4-
<PAGE>


                     In the event the assets of the Corporation available for 
           distribution to the holders of shares of this Series upon any 
           liquidation, dissolution or winding up of the Corporation, whether 
           voluntary or involuntary, shall be insufficient to pay in full all 
           amounts to which such holders are entitled pursuant to the first 
           paragraph of this Section (v), after giving effect to the second 
           paragraph of this Section (v), no such distribution shall be made on 
           account of any shares of any other class or series of Preferred Stock
           ranking on a parity with the shares of this Series upon such
           liquidation, dissolution or winding up unless proportionate
           distributive amounts shall be paid on account of the shares of this
           Series, ratably in proportion to the full distributable amounts for
           which holders of all such parity shares are respectively entitled
           upon such liquidation, dissolution or winding up.  

                     Upon the liquidation, dissolution or winding up of the 
           Corporation, the holders of shares of this Series then outstanding
           shall be entitled to be paid out of assets of the Corporation
           available for distribution to its stockholders all amounts to which
           such holders are entitled pursuant to the first and second paragraphs
           of this Section (v) before any payment shall be made to the holders
           of Common Stock or any other stock of the Corporation ranking junior
           upon liquidation to this Series.

                     For the purpose of this Section (v), the consolidation or 
           merger of the Corporation with any other corporation shall not be
           deemed to constitute a liquidation, dissolution or winding up of the 
           Corporation.

                      (vi)  The shares of this Series shall not be redeemable.

                     (vii)  In addition to any other vote or consent of
           shareholders required by law or by the Restated Certificate of
           Incorporation, as amended, of the Corporation, each whole share of
           this Series shall, on any matter, vote as a class with any other
           capital stock comprising part of the Reference Package and voting on
           such matter and shall have the number of votes thereon that a holder
           of the Reference Package would have.

                                  -5-
<PAGE>


            IN WITNESS WHEREOF, the undersigned have signed and attested this 
certificate on the ______ day of ____________, ____.

                                    CULLEN/FROST BANKERS, INC.



                                    By:_________________________
                                       Name:
                                       Title:



Attest:



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

                                  -6-
 

 





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