CULLEN FROST BANKERS INC
POS AM, 1998-08-06
NATIONAL COMMERCIAL BANKS
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     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 6, 1998
                                                     REGISTRATION NO. 333-49317
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ----------------------
                         Post-Effective Amendment No. 1
                                       on
                                    FORM S-3
                                       TO
                                    FORM S-4
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                           --------------------------
                           CULLEN/FROST BANKERS, INC.

             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

            TEXAS                          6712                  74-1751768
(STATE OR OTHER JURISDICTION OF (PRIMARY STANDARD INDUSTRIAL  (I.R.S. EMPLOYER
INCORPORATION OR ORGANIZATION)  CLASSIFICATION CODE NUMBER)   DENTIFICATION NO.)

                             100 WEST HOUSTON STREET
                            SAN ANTONIO, TEXAS 78205
                                 (210) 220-4011
   (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                    REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                    ----------------------------------------
                                PHILLIP D. GREEN
                       SENIOR EXECUTIVE VICE PRESIDENT AND
                             CHIEF FINANCIAL OFFICER
                           CULLEN/FROST BANKERS, INC.
                             100 WEST HOUSTON STREET
                            SAN ANTONIO, TEXAS 78205
                                 (210) 220-4011
            (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                                   COPIES TO:
                                 MARK J. MENTING
                               SULLIVAN & CROMWELL
                                125 BROAD STREET
                            NEW YORK, NEW YORK 10004
                            ------------------------

         APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED SALE OF THE SECURITIES TO
THE PUBLIC:  FROM TIME TO TIME AFTER THE  EFFECTIVE  DATE OF THE  POST-EFFECTIVE
AMENDMENT IN LIGHT OF MARKET CONDITIONS AND OTHER FACTORS.
         IF THE ONLY SECURITIES  BEING REGISTERED ON THIS FORM ARE BEING OFFERED
PURSUANT TO DIVIDEND OR INTEREST  REINVESTMENT PLANS, PLEASE CHECK THE FOLLOWING
BOX. [ ]
         IF ANY OF THE  SECURITIES  BEING  REGISTERED  ON  THIS  FORM  ARE TO BE
OFFERED  ON A  DELAYED  OR  CONTINUOUS  BASIS  PURSUANT  TO RULE 415  UNDER  THE
SECURITIES ACT OF 1933,  OTHER THAN  SECURITIES  OFFERED ONLY IN CONNECTION WITH
DIVIDEND OR INTEREST REINVESTMENT PLANS, CHECK THE FOLLOWING BOX. [X]
         IF THIS FORM IS FILED TO REGISTER ADDITIONAL SECURITIES FOR AN OFFERING
PURSUANT TO RULE 462(B) UNDER THE SECURITIES ACT, PLEASE CHECK THE FOLLOWING BOX
AND LIST  THE  SECURITIES  ACT  REGISTRATION  STATEMENT  NUMBER  OF THE  EARLIER
EFFECTIVE REGISTRATION STATEMENT FOR THE SAME OFFERING. [ ]
         IF THIS  FORM IS A  POST-EFFECTIVE  AMENDMENT  FILED  PURSUANT  TO RULE
462(C) UNDER THE SECURITIES ACT, CHECK THE FOLLOWING BOX AND LIST THE SECURITIES
ACT  REGISTRATION   STATEMENT  NUMBER  OF  THE  EARLIER  EFFECTIVE  REGISTRATION
STATEMENT FOR THE SAME OFFERING. [ ]
         IF DELIVERY OF THE  PROSPECTUS  IS EXPECTED TO BE MADE PURSUANT TO RULE
434, PLEASE CHECK THE FOLLOWING BOX. [ ]
                      ------------------------------------
                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
===================================================================================================================
                                                               PROPOSED         PROPOSED
                                                 AMOUNT         MAXIMUM          MAXIMUM
           TITLE OF EACH CLASS OF                 TO BE      FFERING PRICE      AGGREGATE           AMOUNT OF
         SECURITIES TO BE REGISTERED          REGISTERED(1) OPER SHARE(2)   OFFERING PRICE(2)  REGISTRATION FEE(2)
- -------------------------------------------------------------------------------------------------------------------
<S>                                             <C>             <C>             <C>                 <C>    
Common Stock, par value $0.01 per
   share(3)..................................    12,000         $48.82          $585,840              $170
- -------------------------------------------------------------------------------------------------------------------
<FN>
(1)   REPRESENTS  THE ESTIMATED  MAXIMUM  NUMBER OF SHARES OF COMMON STOCK,  PAR
      VALUE $0.01 PER SHARE, WHICH MAY BE SOLD BY THE SELLING SHAREHOLDER.
(2)   THE REGISTRATION FEE WAS PREVIOUSLY PAID AND,  PURSUANT TO RULE 457(F)(2),
      WAS BASED ON THE BOOK VALUE OF THE OVERTON BANCSHARES,  INC. COMMON STOCK,
      PAR VALUE  $4.00 PER SHARE,  CONVERTIBLE  INTO  SHARES OF COMMON  STOCK IN
      CONNECTION  WITH THE  MERGER OF  OVERTON  BANCSHARES,  INC.  WITH AND INTO
      CULLEN/FROST BANKERS, INC.
(3)   INCLUDES  ASSOCIATED  PREFERRED  SHARES  PURCHASE  RIGHTS.  PRIOR  TO  THE
      OCCURRENCE OF CERTAIN EVENTS,  SUCH RIGHTS WILL NOT BE EVIDENCED OR TRADED
      SEPARATELY FROM THE COMMON STOCK.
===================================================================================================================
</FN>
</TABLE>
<PAGE>

PROSPECTUS

                                  12,000 SHARES

                                  CULLEN/FROST
                                  BANKERS, INC.

                                  COMMON STOCK
                           (PAR VALUE $0.01 PER SHARE)
                        - - - - - - - - - - - - - - - - -

         This  prospectus  relates to 12,000  shares  (the  "Shares")  of common
stock, $0.01 par value per share, (the "Common Stock") of Cullen/Frost  Bankers,
Inc.  ("Cullen/Frost")  beneficially owned by the stockholder named herein under
"Selling  Stockholder".  The Selling  Stockholder (as  hereinafter  defined) has
advised  Cullen/Frost  that it proposes to offer the Shares,  from time to time,
through  brokers  in  brokerage  transactions  on the New  York  Stock  Exchange
("NYSE"), to underwriters , dealers or others in negotiated transactions or in a
combination  of such  methods of sale,  at fixed  prices which may be changed at
market  prices  prevailing at the time of sale, at fixed prices which related to
such  prevailing  market prices or at negotiated  prices.  Brokers,  dealers and
underwriters that participate in the distribution of the Shares may be deemed to
be underwriters under the Securities Act of 1933 (as amended,  and together with
the rules and regulations  thereunder , the "Securities Act"), and any discounts
or commissions  received by them from the Selling  Stockholder and any profit on
the  resale of Shares by them may be  deemed to be  underwriting  discounts  and
commissions  under the Securities Act. The Selling  Stockholder may be deemed to
be an underwriter under the Securities Act.

         Cullen/Frost  will not  directly  receive any  proceeds  from the sales
hereunder  of the Shares  but will bear  certain of the  expenses  thereof.  The
Selling  Stockholder plans to use the proceeds from sales hereunder to repay the
principal  of and  accrued  interest  on a loan  contracted  in 1996 from  Frost
National Bank, a subsidiary of  Cullen/Frost.  The Selling  Stockholder will pay
all  applicable  stock  transfer  taxes,  brokerage  commissions,   underwriting
discounts or commissions and the fees of the Selling Stockholder's  counsel, but
Cullen/Frost  will bear all other expenses in connection  with the offering made
hereunder.

         The Common Stock is listed on the NYSE under the symbol "CFR."

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

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
              REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                        - - - - - - - - - - - - - - - - -

     THE SHARES ARE NOT SAVINGS ACCOUNTS, DEPOSITS OR OTHER OBLIGATIONS OF A
     BANK OR SAVINGS ASSOCIATION AND ARE NOT INSURED BY THE FEDERAL DEPOSIT
              INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY.
                        - - - - - - - - - - - - - - - - -

                 The date of this Prospectus is August 6, 1998.

<PAGE>

                              AVAILABLE INFORMATION


         Cullen/Frost is subject to the reporting and informational requirements
of the  Securities  Exchange  Act  of  1934,  as  amended,  and  the  rules  and
regulations thereunder (the "Exchange Act"), and, in accordance therewith, files
reports and other  information with the Securities and Exchange  Commission (the
"Commission"). Such reports and other information filed by Cullen/Frost with the
Commission may be inspected and copied at the principal office of the Commission
at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W.,  Washington,  D.C. 20549,
and may be  inspected  at the  Commission's  Regional  Offices at 7 World  Trade
Center,  New York, New York 10048,  and  Northwestern  Atrium  Center,  500 West
Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of such material may
also be obtained  from the Public  Reference  Section of the  Commission  at 450
Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. Certain of such
reports, Prospectus and other information are also available from the Commission
over the Internet at http://www.sec.gov.  In addition, Cullen/Frost Common Stock
is traded on the NYSE. Reports, the Prospectus, and other information concerning
Cullen/Frost  may be inspected at the offices of the NYSE, 20 Broad Street,  New
York, New York 10005.

         This  Prospectus  does not contain all of the  information set forth in
the Registration  Statement on Form S-3, of which this Prospectus is a part, and
the exhibits thereto  (together with any amendments  thereto,  the "Registration
Statement"),  which has been filed by Cullen/Frost with the Commission under the
Securities Act. Certain portions of the Registration Statement have been omitted
pursuant to the rules and  regulations  of the  Commission and reference to such
portions is hereby made for further information.

         All information  contained  herein with respect to Cullen/Frost and its
subsidiaries has been supplied by Cullen/Frost, and all information with respect
to the Selling Stockholder has been supplied by the Selling Stockholder.

         NO PERSON HAS BEEN  AUTHORIZED TO GIVE ANY  INFORMATION  OR TO MAKE ANY
REPRESENTATION  OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS,  AND, IF GIVEN OR
MADE,  SUCH  INFORMATION OR  REPRESENTATION  SHOULD NOT BE RELIED UPON AS HAVING
BEEN AUTHORIZED BY CULLEN/FROST OR THE SELLING STOCKHOLDER. NEITHER THE DELIVERY
OF  THIS  PROSPECTUS  NOR ANY  DISTRIBUTION  OF THE  SECURITIES  TO  WHICH  THIS
PROSPECTUS RELATES SHALL,  UNDER ANY CIRCUMSTANCES,  CREATE ANY IMPLICATION THAT
THERE  HAS  BEEN  NO  CHANGE  IN  THE  AFFAIRS  OF  CULLEN/FROST  OR  ANY  OF IT
SUBSIDIARIES  SINCE THE DATE HEREOF OR THAT THE INFORMATION  CONTAINED HEREIN IS
CORRECT  AS OF ANY  TIME  SUBSEQUENT  TO ITS  DATE.  THIS  PROSPECTUS  DOES  NOT
CONSTITUTE  AN OFFER TO SELL,  OR A  SOLICITATION  OF AN OFFER TO PURCHASE,  ANY
SECURITIES  OTHER THAN THE SECURITIES TO WHICH IT RELATES OR AN OFFER TO SELL OR
A SOLICITATION OF AN OFFER TO PURCHASE THE SECURITIES OFFERED BY THIS PROSPECTUS
IN ANY JURISDICTION IN WHICH SUCH AN OFFER OR SOLICITATION IS NOT LAWFUL.


                                       -2-

<PAGE>


                INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

         The following documents filed by Cullen/Frost with the Commission (File
No.  0-7275)  under  Section  13(a)  or  15(d) of the  Exchange  Act are  hereby
incorporated by reference in this  Prospectus:  Cullen/Frost's  Annual Report on
Form 10-K as of and for the year  ended  December  31,  1997,  as amended by the
Reports on Form  10-K/A  dated April 30,  1998 and June 29,  1998,  respectively
(together,  the "1997 Cullen/Frost  10-K"); the portions of Cullen/Frost's Proxy
Statement for the Annual Meeting of Shareholders held on May 27, 1998 (the "1998
Cullen/Frost  Proxy  Statement") that have been incorporated by reference in the
1997  Cullen/Frost  10-K;  Cullen/Frost  Report  on Form  10-Q as of and for the
quarter ended March 31,1998;  the description of  Cullen/Frost  Common Stock set
forth in  Cullen/Frost's  Registration  Statement on Form 8-A filed  pursuant to
Section  12 of the  Exchange  Act,  and any  amendment  or report  filed for the
purpose of updating any such  description;  the  description of preferred  share
purchase rights set forth in Cullen/Frost's  Registration  Statement on Form 8-A
filed  pursuant to Section 12 of the Exchange Act, and any amendments or reports
filed for the  purpose of  updating  any such  description;  and  Cullen/Frost's
Current  Reports on Form 8-K, dated February 15, 1998,  relating to the proposed
merger of Overton Bancshares, Inc. ("Overton") with and into Cullen/Frost, April
21, 1998,  relating to first  quarter  earnings of  Cullen/Frost,  and August 6,
1998,  disclosing as a subsequent event in Cullen/Frost's  financial  statements
for the year ended  December  31,  1997 the  completion  on May 29,  1998 of the
merger  of  Overton  with and  into  Cullen/Frost  (the  "Merger")  and  related
supplemental information.

         All documents filed by Cullen/Frost  pursuant to Section 13(a),  13(c),
14 or 15(d) of the Exchange Act  subsequent to the date of this  Prospectus  and
prior to the  termination of the offering of the Shares are hereby  incorporated
by reference in this  Prospectus and shall be deemed a part hereof from the date
of filing of such document.

         Any  statement  contained  herein,  in any  supplement  hereto  or in a
document  incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded for purposes of the  Registration  Statement
and this  Prospectus  to the extent that a statement  contained  herein,  in any
supplement hereto or in any other  subsequently  filed document which also is or
is deemed to be  incorporated  by reference  herein  modifies or supersedes such
statement.  Any such  statement so modified or  superseded  shall not be deemed,
except as so modified or  superseded,  to constitute a part of the  Registration
Statement, this Prospectus, or any supplement hereto.

         THIS PROSPECTUS INCORPORATES BY REFERENCE CERTAIN DOCUMENTS RELATING TO
CULLEN/FROST THAT ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH. SUCH DOCUMENTS
ARE AVAILABLE WITHOUT CHARGE UPON REQUEST FROM:  CULLEN/FROST BANKERS, INC., 100
WEST HOUSTON  STREET,  SAN  ANTONIO,  TEXAS 78205,  (210)  220-4011,  ATTENTION:
INVESTOR RELATIONS.

         THIS  PROSPECTUS   CONTAINS  OR   INCORPORATES  BY  REFERENCE   CERTAIN
FORWARD-LOOKING  STATEMENTS WITH RESPECT TO THE FINANCIAL CONDITION,  RESULTS OF
OPERATIONS AND BUSINESS OF CULLEN/FROST AS WELL AS CERTAIN INFORMATION  RELATING
TO CULLEN/FROST'S  RECENT ACQUISITION OF OVERTON,  INCLUDING STATEMENTS RELATING
TO: (I) THE COST  SAVINGS  THAT WILL BE REALIZED  FROM THE OVERTON  ACQUISITION;
(II) THE IMPACT OF THE OVERTON ACQUISITION ON REVENUES,  INCLUDING THE POTENTIAL
FOR  ENHANCED   REVENUES  AND  OTHER  OPERATIONS  AS  PLANNED;   AND  (III)  THE
RESTRUCTURING  CHARGES  EXPECTED TO BE INCURRED IN  CONNECTION  WITH THE OVERTON
ACQUISITION.   THESE  FORWARD  LOOKING  STATEMENTS  INVOLVE  CERTAIN  RISKS  AND
UNCERTAINTIES.  FACTORS THAT MAY CAUSE ACTUAL RESULTS TO DIFFER  MATERIALLY FROM
THOSE CONTEMPLATED BY SUCH FORWARD

                                       -3-

<PAGE>


LOOKING  STATEMENTS  INCLUDE,  AMONG OTHERS,  THE  FOLLOWING:  (I) EXPECTED COST
SAVINGS FROM THE OVERTON ACQUISITION CANNOT BE FULLY REALIZED OR REALIZED WITHIN
THE EXPECTED TIME FRAME;  (II) COSTS OR DIFFICULTIES  RELATED TO THE INTEGRATION
OF THE BUSINESSES OF CULLEN/FROST  AND OVERTON ARE GREATER THAN EXPECTED;  (III)
REVENUES  FOLLOWING  THE  OVERTON  ACQUISITION  ARE LOWER  THAN  EXPECTED;  (IV)
COMPETITIVE PRESSURE AMONG DEPOSITORY INSTITUTIONS INCREASES SIGNIFICANTLY;  (v)
CHANGES IN THE INTEREST RATE ENVIRONMENT  REDUCE INTEREST MARGINS;  (vi) GENERAL
ECONOMIC  CONDITIONS,  EITHER NATIONALLY OR IN TEXAS, WHERE THE COMBINED COMPANY
WILL BE DOING BUSINESS,  ARE LESS FAVORABLE THAN EXPECTED;  OR (vii) LEGISLATION
OR  REGULATORY  CHANGES  ADVERSELY  AFFECT THE  BUSINESSES IN WHICH THE COMBINED
COMPANY WOULD BE ENGAGED.


                                  CULLEN/FROST

GENERAL

         Financial and other  information  relating to  Cullen/Frost,  including
information  relating to  Cullen/Frost  directors  and  executive  officers,  is
contained or incorporated in the 1997 Cullen/Frost 10-K, 1998 Cullen/Frost First
Quarter  10-Q,  and 1998  Current  Reports  on form 8-K,  copies of which may be
obtained from Cullen/Frost as indicated under "Available Information".  See also
"Incorporation Of Certain Documents By Reference".

CULLEN/FROST

         General.  Cullen/Frost  is a Texas  corporation  and a registered  bank
holding company within the meaning of the Bank Holding Company Act of 1956 ("the
BHC Act").  Cullen/Frost's  principal assets consist of the capital stock of two
national  banks.  The larger of the banks is Frost Bank that was  chartered as a
national banking association in 1899.

         Currently,  Cullen/Frost  has 76 offices across Texas with 19 locations
in San Antonio,  22 in the  Houston-Galveston  area, 14 in the Fort Worth/Dallas
area, five in Austin, 10 in the Corpus Christi area, three in San Marcos, two in
McAllen  and one in New  Braunfels.  For  the  year  ended  December  31,  1997,
Cullen/Frost  reported net income of $63.5 million,  or $2.75 per diluted share,
as compared to net income of $55.0 million,  or $2.40 per diluted share, for the
year ended  December 31, 1996.  At December  31,  1997,  Cullen/Frost  had total
assets, deposits and shareholders' equity of $5.2 billion, $4.5 billion and $408
million,  respectively,  as  compared  to $4.9  billion,  $4.2  billion and $379
million,  respectively,  at December 31,  1996.  The above  reported  results of
operations and financial position do not reflect the Merger with Overton.

         On July 21, 1998,  Cullen/Frost  reported after-tax  operating earnings
for the second quarter 1998 of $21.0 million,  or $.77 per diluted common share,
which  earnings  excluded  the  after-tax  impact  of   merger-related   charges
associated with the Merger.  Including the merger-related charge, net income and
diluted  cash  earnings  per share  were  reported  as $11.5  million  and $.42,
respectively.

         Cullen/Frost's  principal  executive  offices  are  located at 100 West
Houston Street, San Antonio, Texas 78205 (telephone:(210) 220-4011).

         Cullen/Frost's Common Stock. Cullen/Frost Common Stock began trading on
the NYSE on  August  14,  1997  under  the  symbol  "CFR."  Prior  to that  date
Cullen/Frost  Common  Stock  traded on The NASDAQ  Stock Market under the symbol
"CFBI".


                                       -4-

<PAGE>


                               RECENT DEVELOPMENTS

OVERTON BANKSHARES INC.

         On May 29, 1998, Cullen/Frost acquired Overton, a Texas corporation and
a registered bank holding company  conducting its operations through the 14 full
service banking facilities of its banking subsidiary Overton Bank and Trust N.A.
based in Tarrant and Dallas  Counties,  Texas.  In  connection  with the Merger,
Cullen/Frost  issued  4,382,321  shares of Common  Stock to  holders  of Overton
common stock, including 92,750 shares to the Selling Stockholder of which 12,000
shares are covered by this Prospectus.


                    DESCRIPTION OF CULLEN/FROST CAPITAL STOCK

         The descriptive  information  below outlines certain  provisions of the
Cullen/Frost Articles of Incorporation (the "Cullen/Frost Articles"), the bylaws
of Cullen/Frost (the "Cullen/Frost  Bylaws") and the Texas Business Corporations
Act (the  "TBCA").  The  information  does not  purport  to be  complete  and is
qualified in all respects by reference  to the  provisions  of the  Cullen/Frost
Articles of Incorporation and the Cullen/Frost Bylaws, which are incorporated by
reference  as  exhibits  to  the  Registration  Statement,  and  the  TBCA.  See
"Available Information."

GENERAL

         Cullen/Frost's  authorized  capital stock consists of 90,000,000 shares
of Cullen/ Frost Common Stock,  and 10,000,000  shares of preferred  stock,  par
value  $0.01 per share  ("Cullen/Frost  Preferred  Stock").  As of July 19, 1998
there were  26,648,010  shares of Cullen/Frost  Common Stock  outstanding and no
shares of Cullen/Frost  Preferred Stock  outstanding.  In addition,  on July 19,
1998,  2,719,541 shares of Cullen/Frost  Common Stock were reserved for issuance
upon conversion of notes, exercise of stock options and awards.

         Because  Cullen/Frost is a holding company,  the rights of Cullen/Frost
to  participate  in any  distribution  of  assets  of any  subsidiary  upon  its
liquidation   or   reorganization   or  otherwise   (and  thus  the  ability  of
Cullen/Frost's  shareholders to benefit indirectly from such distribution) would
be subject to the prior claims of creditors  of that  subsidiary,  except to the
extent  that  Cullen/Frost  itself may be a  creditor  of that  subsidiary  with
recognized claims. Claims on Cullen/Frost's subsidiaries by creditors other than
Cullen/Frost  will  include  substantial  obligations  with  respect  to deposit
liabilities and purchased funds.

PREFERRED STOCK

         The   Cullen/Frost   Board  is  authorized  to  fix  the   preferences,
limitations  and relative  rights of the  Cullen/Frost  Preferred  Stock and may
establish  series  of  such  Cullen/Frost  Preferred  Stock  and  determine  the
variations  between series,  and may cause Cullen/Frost to issue any such shares
without the approval of the holders of  Cullen/Frost  Common Stock.  If and when
any  Cullen/Frost  Preferred  Stock  is  issued,  the  holders  of  Cullen/Frost
Preferred Stock may have a preference over holders of Cullen/Frost  Common Stock
in the payment of dividends,  upon  liquidation of  Cullen/Frost,  in respect of
voting rights and in the redemption of the capital stock of Cullen/Frost.


                                       -5-

<PAGE>


COMMON STOCK

         Dividends.  The holders of  Cullen/Frost  Common  Stock are entitled to
share ratably in dividends when and if declared by the  Cullen/Frost  Board from
funds legally available therefor.

         Voting Rights.  Each holder of  Cullen/Frost  Common Stock has one vote
for each share held on matters presented for consideration by the shareholders.

         Classification of Board of Directors. The Cullen/Frost Board is divided
into  three  classes,  each  serving  three-year  terms,  so that  approximately
one-third of the directors of Cullen/Frost are elected at each annual meeting of
the shareholders of Cullen/Frost.  Classification of the Cullen/Frost  Board has
the  effect of  decreasing  the number of  directors  that could be elected in a
single year by any person who seeks to elect its  designees to a majority of the
seats on the Cullen/Frost  Board and thereby could impede a change in control of
Cullen/Frost.

         Preemptive  Rights.  The holders of  Cullen/Frost  Common Stock have no
preemptive rights to acquire any additional shares of Cullen/Frost Common Stock.

         Issuance of Stock. The Cullen/Frost Articles authorize the Cullen/Frost
Board to issue authorized  shares of Cullen/Frost  Common Stock and Cullen/Frost
Preferred Stock and any other securities without shareholder approval.  However,
Cullen/Frost  Common  Stock is listed on the NYSE,  which  requires  shareholder
approval of the issuance of additional shares of Cullen/Frost Common Stock under
certain circumstances.

         Liquidation  Rights.  In  the  event  of  liquidation,  dissolution  or
winding-up of  Cullen/Frost,  whether  voluntary or involuntary,  the holders of
Cullen/Frost Common Stock will be entitled to share ratably in any of its assets
or funds that are  available  for  distribution  to its  shareholders  after the
satisfaction of its  liabilities (or after adequate  provision is made therefor)
and  after  preferences  of  any  outstanding   Cullen/Frost   Preferred  Stock.
Cullen/Frost  Common Stock is neither  redeemable nor  convertible  into another
security of Cullen/Frost.

AMENDMENT OF ARTICLES OF INCORPORATION AND BYLAWS

         The  Cullen/Frost  Articles do not contain  provisions for amending the
Cullen/Frost  Articles  or  Cullen/Frost  Bylaws.  Pursuant  to  the  TBCA,  the
Cullen/Frost  Articles can be amended by a two-thirds  vote of the  Cullen/Frost
Common Stock.

         Cullen/Frost's  Bylaws  provide  that the  Cullen/Frost  Bylaws  may be
adopted,  amended or repealed by a vote of a majority of the  Directors  or by a
vote of the holders of three-fourths of the outstanding shares.


SPECIAL MEETINGS OF SHAREHOLDERS

         A special meeting of the  shareholders of Cullen/Frost may be called by
the  holders  of at  least  10% of the  outstanding  Cullen/Frost  Common  Stock
entitled  to vote at such  meeting,  by the  Cullen/Frost  Board,  or the Senior
Chairman, Chairman or President of Cullen/Frost.

NUMBER OF DIRECTORS, CLASSIFIED BOARD OF DIRECTORS

         The  Cullen/Frost  Bylaws  state  that the  number of  directors  shall
consist  of one  or  more  members  as  determined  from  time  to  time  by the
Cullen/Frost  Board.  The  Cullen/Frost  Board  currently has 22 directors.  The
Cullen/Frost  Bylaws  state that,  commencing  with the 1996  Annual  Meeting of
Shareholders,  the  Cullen/Frost  Board shall be divided  into three  classes to
serve  staggered  three-year  terms after the initial  expiration  dates of each
respective  class.  The effect of  Cullen/Frost's  having a classified  board of
directors  is

                                       -6-

<PAGE>


that  approximately  only one-third of the members of the Cullen/Frost Board are
elected  each  year;  consequently,  two annual  meetings  of  Shareholders  are
effectively required for Cullen/Frost's shareholders to change a majority of the
members of the Cullen/Frost Board.

REMOVAL OF DIRECTORS

         The  Cullen/Frost  Bylaws state that a director of Cullen/Frost  may be
removed  only for  cause  and only by the  affirmative  vote of the  holders  of
two-thirds of the outstanding voting shares.


ADVANCE NOTICE OF DIRECTOR NOMINATIONS

         The  Cullen/Frost  Bylaws  provide  that  director   nominations  by  a
shareholder  must be in writing  delivered to the Secretary of Cullen/Frost  not
less than 60 nor more than 90 days prior to the date of the  meeting;  provided,
however,  that  if the  date of the  meeting  is  first  publicly  announced  or
disclosed (in a public filing or otherwise)  less than 70 days prior to the date
of meeting,  such advance notice shall be given not more than 10 days after such
date is first so announced or  disclosed.  Public notice shall be deemed to have
been given 70 days or more in advance of the annual meeting of  shareholders  if
Cullen/Frost  shall have previously  disclosed,  in the  Cullen/Frost  Bylaws or
otherwise, that the annual meeting of shareholders in each year is to be held on
a determinable  date, unless and until the Cullen/Frost Board determines to hold
the meeting on a different date.

LIMITATION ON DIRECTOR LIABILITY

         The Cullen/Frost Articles provide that, to the full extent permitted by
law, a  director  of  Cullen/Frost  shall not be liable to  Cullen/Frost  or its
shareholders  for  monetary  damages for an act or  omission  in the  director's
capacity as a director,  except that the Cullen/Frost  Articles do not limit the
liability of a director  for:  (i) a breach of a  director's  duty of loyalty to
Cullen/Frost or its  shareholders;  (ii) an act or omission not in good faith or
that involves intentional  misconduct or a knowing violation of the law; (iii) a
transaction from which a director received an improper  benefit,  whether or not
the benefit  resulted  from an action taken  within the scope of the  director's
office;  (iv) an action or  omission  for which the  liability  of a director is
expressly  provided for by statute;  or (v) an act related to an unlawful  stock
repurchase or payment of a dividend.

INDEMNIFICATION

         The Cullen/Frost Bylaws provide that Cullen/Frost shall, to the fullest
extent to which it is  empowered  to do so by the TBCA and any other  applicable
laws,  indemnify  any person who was, is or is  threatened to be made a party to
any threatened,  pending or completed action, suit or proceeding, whether civil,
criminal,  administrative  or  investigative,  by  reason  of the fact that such
person is or was a director or officer of the corporation,  or is or was serving
at the request of the  corporation as a director,  officer,  partner,  venturer,
proprietary,  trustee, employee, agent or similar functionary of another foreign
or domestic corporation,  partnership, joint venture, trust or other enterprise,
against all expenses (including attorneys' fees),  judgments,  fines and amounts
paid in settlement  actually and reasonably  incurred by him in connection  with
such action,  suit or proceeding.  Reasonable  expenses  incurred in defending a
civil or criminal action, suit or proceeding shall be paid by the corporation in
advance of the final disposition of such action, suit or proceeding upon receipt
of (i) a written affirmation by the director, officer, employee or agent who may
be entitled to such  indemnification  of such  persons's  good faith belief that
such person has met the standard of conduct necessary for indemnification  under
the applicable  statute,  and (ii) a written  undertaking by or on behalf of the
director,   officer,   employee   or  agent   who  may  be   entitled   to  such
indemnification,  to repay such amount if it shall ultimately be determined that
such person is not entitled to be indemnified by the corporation.


                                       -7-

<PAGE>


SHAREHOLDER PROTECTION RIGHTS PLAN

         On July 25, 1989,  the  Cullen/Frost  Board  declared a dividend of one
preferred share purchase right (a "Right") for each share of Cullen/Frost Common
Stock  held of record  at the close of  business  on August 1,  1989,  or issued
thereafter and prior to the Separation  Time. The Rights were issued pursuant to
a Rights Agreement, dated as of July 25, 1989, between Cullen/Frost and The Bank
of New York,  as rights agent (the  "Original  Rights  Agreement").  On July 30,
1996,  Cullen/Frost  amended and restated the Original  Rights  Agreement in its
entirety (the "Restated  Rights  Agreement") and appointed Frost Bank to replace
The Bank of New York, as Rights Agent. The terms of the Rights, as so amended by
the Restated Rights Agreement, are as follows:

         Each  Right   entitles   its   registered   holder  to  purchase   from
Cullen/Frost,  after the Separation Time, one one-hundredth of a share of Junior
Participating  Preferred Stock, par value $5.00 per share (the "Junior Preferred
Stock"), for $100 (the "Exercise Price"), subject to adjustment. The Rights will
be evidenced by the Cullen/Frost  Common Stock  certificates  until the close of
business on the earlier of the date (either,  the "Separation Time") that is (i)
the 10th business day (or such later date as the Cullen/Frost Board of Directors
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,  or (ii) the tenth  business  day (or such  earlier or later date as the
Cullen/Frost  Board may from time to time fix by resolution adopted prior to the
Flip-in Date (as hereinafter  defined) that would otherwise have occurred) after
the first  date of public  announcement  by  Cullen/Frost  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 canceled,  terminated or otherwise
withdrawn  prior to the  Separation  Time  without the purchase of any shares of
Cullen/Frost Common 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  Cullen/Frost  Common Stock,  provided,  however,  such term shall not
include (i)  Cullen/Frost,  any  wholly-owned  subsidiary of Cullen/Frost or any
employee stock ownership or other employee  benefit plan of  Cullen/Frost,  (ii)
any  Person  who is the  Beneficial  Owner  of 10% or  more  of the  outstanding
Cullen/Frost 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 Cullen/Frost
Common Stock solely as a result of an acquisition of  Cullen/Frost  Common Stock
by Cullen/Frost, until such time as such Person acquires additional Cullen/Frost
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 Cullen/Frost if such Person promptly divests sufficient  securities such that
such  10% or  greater  Beneficial  Ownership  ceases  or  (iv)  any  Person  who
Beneficially  Owns as defined in the Restated Rights  Agreement shares of Common
Stock consisting solely of (a) shares acquired pursuant to the grant or exercise
of an option granted by  Cullen/Frost  in connection  with an agreement to merge
with, or acquire, Cullen/Frost prior to a Flip-in Date, (b) shares owned by such
Person and its  Affiliates  (as defined in the Restated  Rights  Agreement)  and
Associates  (as defined in the Restated  Rights  Agreement)  at the time of such
grant,  (c) shares,  amounting to less than 1% of the  outstanding  Cullen/Frost
Common  Stock,  acquired by Affiliates  and  Associates of such Person after the
time of such grant or (d) shares that are held by such Person in trust accounts,
managed  accounts and the like or otherwise held in a fiduciary  capacity,  that
are  Beneficially  Owned as defined in the  Restated  Rights  Agreement 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
Cullen/Frost  Common Stock.  Cullen/Frost Common Stock certificates issued prior
to the Separation  Time shall evidence one Right for each share of  Cullen/Frost
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 Cullen/Frost  Common Stock outstanding on or
prior to the Record Date ("Record Date") or which bear an earlier form of legend
shall  also  evidence  one Right for each  share of  Cullen/Frost  Common  Stock
evidenced

                                       -8-

<PAGE>


thereby.   Promptly  following  the  Separation  Time,   separate   certificates
evidencing  the  Rights  ("Rights  Certificates")  will be mailed to  holders of
record of Cullen/Frost 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
Cullen/Frost  Common Stock dividend on, or a subdivision or a combination into a
smaller  number of shares of,  Cullen/Frost  Common  Stock,  or the  issuance or
distribution  of any  securities  or  assets  in  respect  of,  in lieu of or in
exchange for Cullen/Frost 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 Cullen/Frost, upon the exercise thereof in accordance
with the  terms of the  Restated  Rights  Agreement,  that  number  of shares of
Cullen/Frost  Common Stock  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 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  Cullen/Frost  Board
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 Cullen/Frost  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 Cullen/Frost Common Stock at an exchange ratio of one
share of Cullen/Frost Common Stock per Right,  appropriately adjusted to reflect
any stock split, stock dividend or similar transaction  occurring after the date
of the  Separation  Time (for  purposes  of this  section  only,  the  "Exchange
Ratio").  Immediately upon such action by the Cullen/Frost  Board (the "Exchange
Time") the Rights will terminate and each Right will represent only the right to
receive a number of shares of  Cullen/Frost  Common  Stock equal to the Exchange
Ratio.

         Whenever  Cullen/Frost  shall  become  obligated  under  the  preceding
paragraph to issue shares of  Cullen/Frost  Common Stock upon  exercise of or in
exchange for Rights, Cullen/Frost, 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 Cullen/Frost Common Stock so issuable.

         In the event  that prior to the  Expiration  Time  Cullen/Frost  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)  Cullen/Frost  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 Cullen/Frost enters into
an agreement with respect to such consolidation,  merger or share exchange,  the
Acquiring  Person  Controls (as defined in the Restated  Rights  Agreement)  the
Cullen/Frost  Board 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 Cullen/Frost  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)
Cullen/Frost   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 Cullen/Frost
and its  subsidiaries  (taken  as a  whole)  to any  other  Person  (other  than
Cullen/Frost 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  Cullen/Frost  (or any such
subsidiary) enters into an agreement with respect to such sale or transfer,  the
Acquiring Person

                                       -9-

<PAGE>



Controls the  Cullen/Frost  Board 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,  Cullen/Frost  or any of its
subsidiaries,  over any period of 12  consecutive  calendar  months,  assets (1)
having an aggregate  fair market value of more than  $15,000,000 or (2) on terms
and conditions less favorable to Cullen/Frost than Cullen/Frost would be able to
obtain through  arm's-length  negotiations with an unaffiliated third party, (b)
receive  any  compensation  for  services  from   Cullen/Frost  or  any  of  its
subsidiaries,  other than  compensation  for  full-time  employment as a regular
employee at rates in accordance with  Cullen/Frost'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
Cullen/Frost 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
Cullen/Frost or any of its subsidiaries in excess of $5,000,000 or, in any case,
on terms and conditions less favorable to Cullen/Frost than  Cullen/Frost  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 Cullen/Frost or any of its subsidiaries as a result of any
acquisition   from   Cullen/Frost   (with   or   without   consideration),   any
reclassification   of  securities   (including  any  reverse  stock  split),  or
recapitalization,  of Cullen/Frost,  any merger or consolidation of Cullen/Frost
or any other transaction or series of transactions  (whether or not with or into
or  otherwise  involving  an  Acquiring  Person) (a  "Flip-over  Transaction  or
Event"),  Cullen/Frost  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  Cullen/Frost  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  Cullen/Frost  Board 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 per Right (the  "Redemption  Price"),  as
provided in the Restated Rights  Agreement.  Immediately  upon the action of the
Cullen/Frost Board 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 Cullen/Frost,  including,  without limitation,  the
right to vote or to receive dividends.

CHANGES IN CONTROL

Certain provisions of the Cullen/Frost  Articles,  the Cullen/Frost's Bylaws and
applicable  United  States  federal  law may  have  the  effect  of  preventing,
discouraging or delaying any change in control of Cullen/Frost. The authority of
the Cullen/Frost  Board to issue Preferred Stock with such rights and privileges
as it may deem appropriate may enable the Cullen/Frost Board to prevent a change
in control  despite a shift in ownership of the  Cullen/Frost  Common Stock.  In
addition,   the  Cullen/Frost  Board's  power  to  issue  additional  shares  of
Cullen/Frost  Common  Stock  may help  delay or deter a  change  in  control  by
increasing  the  number  of  shares  needed  to  gain  control.   Moreover,  the
classification  of  the  Cullen/Frost   Board  would  delay  the  ability  of  a

                                      -10-

<PAGE>

dissatisfied  shareholder  or anyone who obtains a  controlling  interest in the
Cullen/Frost  Common Stock to elect its  designees to a majority of the seats on
the Cullen/Frost  Board. In addition,  a director of Cullen/Frost may be removed
only for cause and only by the affirmative  vote of the holders of two-thirds of
the  outstanding  voting  shares.  Such  provision  also may deter any change in
control of Cullen/Frost.

         The Federal Change in Bank Control Act of 1978, as amended, prohibits a
person or group of persons from  acquiring  "control" of a bank holding  company
unless the Federal  Reserve has been given 60 days' prior written notice of such
proposed  acquisition  and within that time  period the Federal  Reserve has not
issued a notice  disapproving  the proposed  acquisition  or extending for up to
another 30 days the period  during which such a  disapproval  may be issued.  An
acquisition may be made prior to the expiration of the disapproval period if the
Federal  Reserve  issues  written  notice of its  intent not to  disapprove  the
action. Under a rebuttable  presumption  established by the Federal Reserve, the
acquisition  of more  than 10% of a class  of  voting  stock  of a bank  holding
company with a class of securities  registered  under Section 12 of the Exchange
Act would, under the circumstances set forth in the presumption,  constitute the
acquisition of control.

     In addition, any "company" would be required to obtain the approval of the
Federal Reserve under the BHC Act before acquiring 25% (5% in the case of an
acquiror that is a bank holding company) or more of the outstanding shares of
Cullen/Frost Common Stock, or such lesser number of shares as constitute control
over Cullen/Frost.

                               SELLING STOCKHOLDER

     The Shares are being offered for the account of the selling  stockholder of
Cullen/Frost named below (the "Selling  Stockholder").  The Selling  Stockholder
may offer Shares in separate transactions or in a single transaction. The Shares
were issued by  Cullen/Frost  to the Selling  Stockholder in connection with the
Merger on May 29, 1998.

     The Selling  Stockholder is the Overton  Bancshares,  Inc. Employees' Stock
Ownership Plan (the "ESOP").  The ESOP was established for eligible employees of
Overton and its bank subsidiary  Overton Bank and Trust, N.A.  effective January
1, 1995. Terms of the ESOP provided that shares of common stock of Overton would
be sold to the ESOP at a price equal to fair market value. The purchase price of
the shares  would be paid from the  proceeds  of a loan which the ESOP  obtained
from  Frost  National  Bank,   with  the  loan  to  be  repaid  from  subsequent
contributions by Overton to the ESOP.

     In 1996,  the ESOP borrowed  $1,000,000  from Frost  National  Bank, a bank
subsidiary of Cullen/Frost, (guaranteed by Overton) to purchase 25,000 shares of
common  stock of  Overton.  These  shares  were held in trust and were issued to
Overton and Overton Bank and Trust  employees'  accounts in the ESOP as the loan
was repaid.  At May 29, 1998,  8,545 shares were  allocated to  employees.  As a
result of the merger of Overton with and into Cullen/Frost, the 25,000 shares of
common stock of Overton  held by the ESOP were  exchanged  for 92,750  shares of
common stock of Cullen/Frost.  The Selling  Stockholder plans to sell the shares
of Common Stock registered hereby to repay the principal of and accrued interest
on the loan  contracted in 1996.  The ESOP's  current  trustee is Frost National
Bank, as successor to the original trustee, Overton Bank and Trust.

     The  Selling  Stockholder  does  not  own  more  than  one  percent  of the
outstanding shares of Common Stock.

     Because  the  Selling  Stockholder  may sell all or a portion of the Shares
that may be offered pursuant to this Prospectus,  the number of Shares that will
be owned by the Selling  Stockholder upon termination of this offering cannot be
determined.




                                      -11-
<PAGE>

                              PLAN OF DISTRIBUTION

     The  Shares  may be  sold  from  time  to  time  directly  by  the  Selling
Stockholder in separate transactions or in a single transaction.  Such sales may
be made on the NYSE,  or such other  national  securities  exchange or automated
interdealer  quotation  system on which  shares of Common Stock are then listed,
through negotiated  transactions or otherwise at market prices prevailing at the
time of the sale or at negotiated prices.  Alternatively , from time to time the
Selling  Stockholder  may offer  Shares  through  brokers,  dealers  or  agents,
including  a  broker-dealer   subsidiary  of   Cullen/Frost,   who  may  receive
compensation  in the  form  of  concessions  or  commissions  from  the  Selling
Stockholder,  agents and/or the  purchasers  for whom they may act as agent.  If
necessary, a supplemental Prospectus will describe the method of sale in greater
detail.  In addition,  any of the Shares which qualify for sale pursuant to Rule
144 under the  Securities Act may be sold under Rule 144 rather than pursuant to
this Prospectus.

     The  Selling  Stockholder  and any such  brokers,  dealers  or agents  that
participate in the distribution of the Shares may be deemed to be "underwriters"
within the meaning of the Securities  Act, and any profits on the sale of Shares
by them  and any  associated  discounts,  commissions  or  concessions  that are
received may be deemed to be underwriting compensation under the Securities Act.
To the extent the Selling  Stockholder may be deemed to be an  underwriter,  the
Selling  Stockholder may be subject to certain  statutory  liabilities under the
Securities  Act,  including  but  not  limited  to  Sections  11  and  12 of the
Securities Act.

     Shares may be sold from time to time on one or more transactions at a fixed
offering  price,  which may be changed,  or at varying prices  determined at the
time of  sale or at  negotiated  prices.  If  applicable,  such  prices  will be
determined by agreement  between the Selling  Stockholder  and any such dealers.
The Selling Stockholder may, from time to time, authorize dealers, acting as the
Selling  Stockholder's  agents,  to solicit  offers to purchase  Shares upon the
terms and conditions set forth in any supplemental  Prospectus.  Cullen/Frost is
not aware of any  arrangements  or  contacts  that the Selling  Stockholder  has
entered into to effect any such transactions in the Shares,  nor is Cullen/Frost
aware of which  brokerage  firms the Selling  Stockholders  may select to effect
brokerage transactions.

     The Selling  Stockholder  and any other person  participation  in a sale of
distribution of Shares will be subject to applicable  provisions of the Exchange
Act and the rules and regulations thereunder,  including without limitation Rule
10b-5 and  Regulation M, which  provisions may limit the timing of purchases and
sales of any of the Shares by the Selling Stockholder and any other such person.

     In order to comply  with  securities  laws in  certain  jurisdictions,  the
Shares offered hereby will be offered or sold in such jurisdictions only through
registered or licensed brokers or dealers. In addition, in certain jurisdictions
the  securities  offered hereby may not be offered or sold unless they have been
registered  or qualified  for sale in such  jurisdictions  or an exemption  from
registration qualification is available and is complied with.

     Cullen/Frost will not receive any part of the proceeds from the sale of the
Shares.  The Selling  Stockholder plans to use the proceeds from sales hereunder
to repay the principal of and accrued interest on a loan contracted in 1996 from
Frost National Bank, a subsidiary of  Cullen/Frost.  See "Selling  Stockholder".
The Selling Stockholder will pay all applicable stock transfer taxes,  brokerage
commission,  underwriting  discounts or  commission  and the fees of the Selling
Stockholder's  counsel,  and  Cullen/Frost  will  bear  all  other  expenses  in
connection  with the  offering  and sale of the Shares,  including  filing fees,
legal and  accounting  fees and expenses,  printing  costs,  and other  expenses
arising out of the preparation and filing of the Registration Statement and this
Prospectus. Cullen/Frost has agreed to indemnify the Selling Stockholder against
certain liabilities,  including certain liabilities under the Securities Act, in
connection with the registration and the offering and sale of the Shares.



                                      -12-
<PAGE>

                                 USE OF PROCEEDS

     Cullen/Frost  will  not  directly  receive  any  proceeds  from  the  sales
hereunder of the Shares but will bear certain of the expenses thereof. See "Plan
Of Distribution".  The Selling  Stockholder plans to use the proceeds from sales
hereunder to repay the principal of and accrued interest on a loan contracted in
1996 from Frost  National  Bank,  a  subsidiary  of  Cullen/Frost.  See "Selling
Stockholder".


                                     EXPERT

     The  consolidated   financial   statements  of  Cullen/Frost   included  in
Cullen/Frost's  current  report  on Form 8-K  dated  August 6, 1998 for the year
ended  December  31,  1997 have been  audited by Ernst & Young LLP,  independent
auditors, as set forth in their report thereon included therein and incorporated
herein by reference.  Such consolidated financial statements are incorporated by
reference in reliance  upon such report given upon the authority of such firm as
experts in accounting and auditing.


                      VALIDITY OF CULLEN/FROST COMMON STOCK

     The  validity of the shares of  Cullen/Frost  Common  Stock  being  offered
hereby was passed upon for Cullen/Frost by Wachtell, Lipton, Rosen & Katz.


























                                      -13-

<PAGE>


<TABLE>
<S>                                                                    <C>
=============================================================          =============================================================


     NO DEALER, SALESMAN OR OTHER PERSON HAS BEEN AUTHORIZED
TO GIVE ANY INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER
THAN THOSE CONTAINED OR INCORPORATED IN THIS PROSPECTUS AND,
IF GIVEN OR MADE, SUCH INFORMATION OR  REPRESENTATIONS  MUST
NOT  BE  RELIED   UPON  AS   HAVING   BEEN   AUTHORIZED   BY
CULLEN/FROST,  BY THE  SELLING  STOCKHOLDER  OR BY ANY OTHER
PERSON. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE                                          12,000 SHARES
MADE  HEREUNDER  SHALL  UNDER  ANY  CIRCUMSTANCES  CREATE AN
IMPLICATION  THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF
CULLEN/FROST SINCE THE DATE HEREOF. THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY ANY SECURITIES  OTHER THAN THE SHARES  DESCRIBED IN THIS
PROSPECTUS OR AN OFFER TO SELL OR  SOLICITATION  OF AN OFFER
TO BUY SUCH SHARES IN ANY  CIRCUMSTANCES IN WHICH SUCH OFFER
OR SOLICITATION IS UNLAWFUL.
                                                                                               ------------------------------

                                                                                                         CULLEN/FROST

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


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

                                                                                                    BANKERS, INC.
                    TABLE OF CONTENTS
                                                                                               ------------------------------
                                                        PAGE
                                                        ----

Available Information....................................  2
Incorporation of Certain Documents by
  Reference..............................................  3
Cautionary Statement Concerning
  Forward-Looking Information............................  3                                         COMMON STOCK
Cullen/Frost.............................................  4
Recent Developments......................................  5                                  (PAR VALUE $0.01 PER SHARE)
Description of Cullen/Frost Capital Stock................  5
Selling Stockholder...................................... 11
Plan of Distribution..................................... 12
Use of Proceeds.......................................... 13
Expert................................................... 14
Validity of Cullen/Frost Common Stock.................... 14




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











=============================================================          =============================================================
</TABLE>


<PAGE>



                                                      PART II


                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.   OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth an itemization of all estimated  expenses in
connection  with  the  issuance  and   distribution  of  the  securities   being
registered, none of which are payable by the Selling Stockholder.


Registration Statement filing fee        $170     Previously paid by Registrant
Legal fees and expenses                  $10,000
Accounting fees and expenses             $5,000
Printing costs                           $2,000
Miscellaneous                            $2,500
Total                                    $19,670


ITEM 15.   INDEMNIFICATION OF DIRECTORS AND OFFICERS

     The Registrant is incorporated under the laws of Texas.  Section 2.02-1. of
the Texas  Business  Corporation  Act  prescribes  the  conditions  under  which
indemnification  may be obtained  by a present or former  director or officer of
the  Registrant  who incurs  expenses or liability as a  consequence  of certain
proceedings  arising  out of his or her  activities  as a director  or  officer.
Article 11 of the  Registrant's  Amended and Restated  Articles of Incorporation
and  Article  V of  the  Registrant's  Bylaws  provide  for  indemnification  of
directors and officers under certain circumstances. The Registrant has purchased
a standard liability policy,  which, subject to any limitations set forth in the
policy,  indemnifies  the  Registrant's  directors and officers for damages that
they become legally  obligated to pay as a result of any negligent act, error or
omission committed while serving in their official capacity.

















                                      -15-

<PAGE>



ITEM 16.   EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

     The  following  exhibits  are  filed  herewith  or  incorporated  herein by
reference.

<TABLE>
<CAPTION>
    EXHIBIT
     NUMBER                           DESCRIPTION
    -------         ---------------------------------------------------------------------------------
<S>                 <C>
      2.1           --Agreement and Plan of Merger, by and between Overton Bancshares, Inc. and
                      Cullen/Frost Bankers, Inc., dated as of February 15, 1998. *
      5.1           --Opinion of Wachtell, Lipton, Rosen & Katz. *
      8.1           --Opinion of Sullivan & Cromwell. *
      8.2           --Opinion of Wachtell, Lipton, Rosen & Katz. *
     23.1           --Consent of Keefe, Bruyette & Woods, Inc. *
     23.2           --Consent of Sullivan & Cromwell, included in Exhibit 8.1 to this Registration
                      Statement. *
     23.3           --Consent of Wachtell, Lipton, Rosen & Katz, included in Exhibit 8.2 to this
                      Registration Statement. *
     23.4           --Consent of Ernst & Young LLP. *
     23.5           --Consent of Coopers & Lybrand LLP. *
     23.4           --Consent of Ernst & Young LLP.
     24.1           --Power of Attorney. *
     99.1           --Form of Poll and Consent mailed to shareholders of Overton Bancshares, Inc. who
                      are parties to the Common Stock Restriction and Voting Agreement. *
     99.2           --Form of Revocable Proxy for Special Meeting of Shareholders of Overton
                      Bancshares, Inc. *

<FN>
*: Previously filed.
</FN>
</TABLE>

ITEM 17.   UNDERTAKINGS

     (a) The undersigned Registrant hereby undertakes:

     (1) To file,  during any period in which  offers or sales are being made, a
post-effective amendment to this registration statement:

         (i) To include  any  prospectus  required  by Section  10(a)(3)  of the
Securities Act;

         (ii) To reflect in the prospectus any facts or events arising after the
effective date of the registration  statement (or the most recent post-effective
amendment  thereof)  which,  individually  or  in  the  aggregate,  represent  a
fundamental  change in the information set forth in the registration  statement;
and

        (iii) To include any  material  information  with respect to the plan of
distribution  not  previously  disclosed  in the  registration  statement or any
material change in such information in the registration statement; and

     (2) That, for the purpose of determining any liability under the Securities
Act, each such post-effective amendment shall be deemed to be a new registration
statement  relating to  the securities offered therein, and the offering of such
securities at  the  time  shall be deemed  to be  the initial bona fide offering
thereof;


                                                  -16-

<PAGE>



     (3) To remove from registration  by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     (b) The  undersigned  Registrant  hereby  undertakes  that, for purposes of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
Registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Exchange Act (and, where  applicable,  each filing of an employee benefit plan's
annual  report   pursuant  to  Section  15(d)  of  the  Exchange  Act)  that  is
incorporated by reference in the registration  statement shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (c) The undersigned  Registrant  hereby undertakes that prior to any public
reoffering of the securities  registered  hereunder  through use of a prospectus
which is a part of this  registration  statement,  by any person or party who is
deemed to be an  underwriter  within  the  meaning  of Rule  145(c),  the issuer
undertakes that such reoffering  prospectus will contain the information  called
for by the applicable  registration  form with respect to reofferings by persons
who may be deemed underwriters, in addition to the information called for by the
other items of the applicable form.

     (d) The undersigned  Registrant hereby undertakes that every prospectus (i)
that is filed  pursuant to paragraph  (c)  immediately  preceding,  or (ii) that
purports to meet the  requirements of Section 10(a)(3) of the Securities Act and
is used in connection  with an offering of securities  subject to Rule 415, will
be filed as a part of an amendment to the registration statement and will not be
used until such  amendment is effective,  and that,  for purposes of determining
any liability under the Securities Act, each such post-effective amendment shall
be deemed to be a new registration  statement relating to the securities offered
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

     (e) Insofar as indemnification for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
Registrant pursuant to the foregoing  provisions,  or otherwise,  the Registrant
has been advised that in the opinion of the Securities  and Exchange  Commission
such  indemnification  is against  public policy as expressed in the Act and is,
therefore,  unenforceable. In the event that a claim for indemnification against
such liabilities  (other that the payment by the Registrant of expenses incurred
or paid by a director,  officer or  controlling  person of the Registrant in the
successful  defense of any  action,  suit or  proceeding)  is  asserted  by such
director,  officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

     (f) The undersigned Registrant hereby undertakes to respond to requests for
information  that is incorporated  by reference into the prospectus  pursuant to
Item 4, 10(b), 11 or 13 of this form, within one business day of receipt of such
request,  and to send the  incorporated  documents  by first class mail or other
equally prompt means.  This includes  information  contained in documents  filed
subsequent to the effective date of the registration  statement through the date
of responding to the request.

     (g) The undersigned  Registrant  hereby  undertakes to supply by means of a
post-effective  amendment  all  information  concerning a  transaction,  and the
company  being  acquired  involved  therein,  that  was not the  subject  of and
included in the registration statement when it became effective.








                                      -17-

<PAGE>




                                   SIGNATURES

     PURSUANT TO THE  REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT
HAS DULY CAUSED THIS  REGISTRATION  STATEMENT  TO BE SIGNED ON ITS BEHALF BY THE
UNDERSIGNED,  THEREUNTO DULY  AUTHORIZED,  IN THE CITY OF SAN ANTONIO,  STATE OF
TEXAS, THIS DAY OF AUGUST, 1998.

                                   Cullen/Frost Bankers, Inc.
                                      (Registrant)



                                   By: /s/ Phillip D. Green
                                      ------------------------------------
                                       PHILLIP D. GREEN
                                       SENIOR EXECUTIVE VICE PRESIDENT AND
                                       CHIEF FINANCIAL OFFICER


     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities indicated on this 6th day of August, 1998.


<TABLE>
<CAPTION>
                  SIGNATURE                                  TITLE                           DATE
<S>                                           <C>                                       <C>
                       
                      *                       Chairman of the Board and                 August 6, 1998
- ----------------------------------------------Chief Executive Officer
            RICHARD W. EVANS, JR.             (Principal Executive Officer)
                                              
                       
                      *                       Senior Chairman of the Board              August 6, 1998
- ----------------------------------------------and Director
                 T. C. FROST                  
                       
                      *                       Senior Executive Vice President           August 6, 1998
- ----------------------------------------------and Chief Financial Officer
              PHILLIP D. GREEN                (Principal Financial Officer)
                                              
                      
                      *                       Director                                  August 6, 1998
- ----------------------------------------------
              ISAAC ARNOLD, JR.

                                              Director
- ----------------------------------------------
              ROYCE S. CALDWELL
                      
                      *                       Director                                  August 6, 1998
- ----------------------------------------------
              RUBEN R. CARDENAS
                      
                      *                       Director                                  August 6, 1998
- ----------------------------------------------
               HENRY E. CATTO


                                                  -18-

<PAGE>




                      
                      *                       Director                                  August 6, 1998
- ----------------------------------------------
               BOB W. COLEMAN
                      
                      *                       Director                                  August 6, 1998
- ----------------------------------------------
               HARRY H. CULLEN
                      
                      *                       Director                                  August 6, 1998
- ----------------------------------------------
                ROY H. CULLEN
                      
                      *                       Director                                  August 6, 1998
- ----------------------------------------------
            EUGENE H. DAWSON, SR.
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
               RUBEN ESCOBEDO
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
             W. N. FINNEGAN, III
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
              PATRICK B. FROST
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
                JOE R. FULTON
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
            JAMES W. GORMAN, JR.
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
               JAMES L. HAYNE
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
           RICHARD M. KLEBERG, III
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
              ROBERT S. MCCLANE
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
              IDA CLEMENT STEEN
                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
             CURTIS VAUGHAN, JR.


                                                  -19-

<PAGE>




                      
                      *                        Director                                  August 6, 1998
- ----------------------------------------------
            MARY BETH WILLIAMSON

                                              Director
- ----------------------------------------------
             HORACE WILKINS, JR.




*By:  /s/ Phillip D. Green
    -------------------------------------
      PHILLIP D. GREEN
      ATTORNEY-IN-FACT

</TABLE>

























                                      -20-

<PAGE>



<TABLE>
<CAPTION>
                                INDEX TO EXHIBITS


 EXHIBIT                                                                                         PAGE
 NUMBER                                      DESCRIPTION                                        NUMBER
- ---------  ----------------------------------------------------------------------------------   ------
<C>        <S>                                                                                   <C>
   * 2.1   --AGREEMENT AND PLAN OF MERGER, BY AND BETWEEN OVERTON BANCSHARES, INC. AND
             CULLEN/FROST BANKERS, INC., DATED AS OF FEBRUARY 15, 1998. .....................
   * 5.1   --OPINION OF WACHTELL, LIPTON, ROSEN & KATZ ......................................
   * 8.1   --OPINION OF SULLIVAN & CROMWELL. ................................................
   * 8.2   --OPINION OF WACHTELL, LIPTON, ROSEN & KATZ. .....................................
   * 23.1  --CONSENT OF KEEFE, BRUYETTE & WOODS, INC. .......................................
   * 23.2  --CONSENT OF SULLIVAN & CROMWELL, INCLUDED IN EXHIBIT 8.1 TO THIS REGISTRATION
             STATEMENT. .....................................................................
   * 23.3  --CONSENT OF WACHTELL, LIPTON, ROSEN & KATZ, INCLUDED IN EXHIBIT 8.2 TO THIS
             REGISTRATION STATEMENT. ........................................................
   * 23.4  --CONSENT OF ERNST & YOUNG LLP. ..................................................
   * 23.5  --CONSENT OF COOPERS & LYBRAND LLP. ..............................................
   23.6    --CONSENT OF ERNST & YOUNG LLP. ..................................................
   * 24.1  --POWER OF ATTORNEY. .............................................................
   * 99.1  --FORM OF POLL AND CONSENT MAILED TO SHAREHOLDERS OF OVERTON BANCSHARES, INC.
             WHO ARE PARTIES TO THE COMMON STOCK RESTRICTION AND VOTING AGREEMENT............
   * 99.2  --FORM OF REVOCABLE PROXY FOR SPECIAL MEETING OF SHAREHOLDERS OF OVERTON
             BANCSHARES, INC. ...............................................................

<FN>
*: PREVIOUSLY FILED.
</FN>
</TABLE>





                                                                    EXHIBIT 23.6



                         CONSENT OF INDEPENDENT AUDITORS

     We consent to the  reference to our firm under the caption  "Expert" in the
Post-Effective  Amendment No. 1 on Form S-3 to Form S-4  Registration  Statement
and related Prospectus of Cullen/Frost Bankers, Inc. for the registration of the
resale  of  12,000  shares  of its  common  stock  and to the  incorporation  by
reference  therein of our report dated  February  15, 1998,  with respect to the
consolidated  financial  statements of Cullen/Frost  Bankers,  Inc. for the year
ended  December 31, 1997 included in its Current Report on Form 8-K dated August
6, 1998, filed with the Securities and Exchange Commission.


ERNST & YOUNG LLP


San Antonio, Texas
August 6, 1998



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