WELLS FARGO & CO/MN
S-4, 1999-02-02
NATIONAL COMMERCIAL BANKS
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<PAGE>
     As filed with the Securities and Exchange Commission on February 2, 1999
                                                   Registration No. 333-________
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    Form S-4
                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933

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

                              Wells Fargo & Company
             (Exact name of registrant as specified in its charter)

           Delaware                                    41-0449260
(State or other jurisdiction of                     (I.R.S. Employer
 incorporation or organization)                    Identification No.)

                                     6712
                         (Primary Standard Industrial
                          Classification Code Number)

                              420 Montgomery Street
                         San Francisco, California 94163
                                 1-800-411-4932
               (Address, including zip code, and telephone number,
        including area code, of registrant's principal executive offices)

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

                                Stanley S. Stroup
                  Executive Vice President and General Counsel
                              Wells Fargo & Company
                              420 Montgomery Street
                         San Francisco, California 94163
                                  415-396-6019
                (Name, address, including zip code, and telephone
               number, including area code, of agent for service)

                                   Copies to:
         Mary E. Schaffner                              Stanley F. Farrar
           Robert L. Lee                                  Albert Y. Liu
       Wells Fargo & Company                           Sullivan & Cromwell
           Norwest Center                             1888 Century Park East
        Sixth and Marquette                       Los Angeles, California 90067
 Minneapolis, Minnesota 55479-1026                       (310) 712-6000
          (612) 667-2367                                
                               ------------------

     Approximate date of commencement of proposed sale of the securities to the
public: As soon as practicable after the effective date of the Registration
Statement.

     If the securities being registered on this form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. [ ]

<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE
========================================================================================================
     Title of Securities             Amount        Proposed Maximum     Proposed Maximum    Amount of
            to Be                    to Be          Offering Price         Aggregate       Registration
         Registered                Registered          Per Share         Offering Price        Fee
- --------------------------------------------------------------------------------------------------------
<S>                                <C>                    <C>          <C>                  <C>
        Common Stock               5,000,000              N/A            $76,604,000(2)   $22,598.18(3)
(par value $1-2/3 per share)(1)
========================================================================================================
</TABLE>
(1) Each share of the registrant's common stock includes one preferred stock
    purchase right.

(2) Estimated solely for the purpose of computing the registration fee, in
    accordance with Rule 457(f), based upon the book value as of September 30,
    1998 of all shares of common stock to be acquired by the registrant in the
    transactions described herein.

(3) Based on .000295 of the proposed maximum aggregate offering price.

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

     The registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the registrant shall
file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.
- -------------------------------------------------------------------------------
<PAGE>
 
                                [Bank Letterhead]



    You are cordially invited to attend a special meeting of shareholders of
Mercantile Bank, National Association (the "Bank"). The date, time, and place of
the meeting are as follows:

    Wednesday, February 24, 1999
    1:30 p.m., local time
    835 East Levee Street
    Brownsville, Texas  78520

    At the special meeting, you will be asked to consider and vote on a proposal
to approve the acquisition of the Bank by Wells Fargo & Company (formerly named
Norwest Corporation) ("Wells Fargo"), under the terms of an Agreement and Plan
of Reorganization ("Reorganization Agreement"), dated as of October 28, 1998, by
and among the Bank, Mercantile Financial Enterprises, Inc. ("Mercantile") and
Wells Fargo, and an agreement and plan of consolidation (the "Consolidation
Agreement"). Copies of the Reorganization Agreement and the Consolidation
Agreement are attached to the enclosed proxy statement-prospectus as Appendix A
and Appendix B, respectively.

    As part of the acquisition of the Bank, Wells Fargo also proposes to acquire
Mercantile, which holds approximately 96.0% of the outstanding common stock of
the Bank. Wells Fargo will acquire Mercantile by a merger of a wholly-owned
subsidiary of Wells Fargo into Mercantile. This merger will occur immediately
before the consolidation. The sole shareholder of Mercantile has agreed with
Wells Fargo that it will consent to the merger.

    If both acquisitions are completed, Wells Fargo will exchange $174,000,000
of its common stock for all of the outstanding Mercantile common stock and the
outstanding Bank common stock held by shareholders of the Bank other than
Mercantile. Of this total amount, the sole shareholder of Mercantile will
receive in the merger Wells Fargo common stock equal to approximately 96.0% of
an amount equal to $174,000,000 minus the net liabilities of Mercantile. Because
the shares of Bank common stock held by Mercantile will be indirectly acquired
by Wells Fargo in the merger, Mercantile will not receive, and the shares of
Bank common stock held by Mercantile will not be exchanged for, any additional
shares of Wells Fargo common stock in the consolidation. As a result, only
shares of common stock of the Bank held by shareholders other than Mercantile
will be exchanged for Wells Fargo common stock in the consolidation. Such Bank
shareholders will receive in the consolidation Wells Fargo common stock equal to
approximately 4.0% of the sum of $174,000,000 plus the net liabilities of
Mercantile. Based on estimated net liabilities of Mercantile of $14.0 million as
of September 30, 1998, and 110,551 shares of outstanding Bank common stock held
by Bank shareholders other than Mercantile, this works out to approximately
$68.00 per share of the Bank common stock. 

     The actual number of shares to be received by the Bank shareholders other
than Mercantile in the consolidation will be determined using a formula which is
explained in detail under the heading "Summary--The Transactions--What the Bank
Shareholders will Receive" on page __, and also under the heading "The
Reorganization Agreement--Structure and Consideration" on page __, of this proxy
statement-prospectus. However, you may calculate the approximate number of
shares of Wells Fargo common stock you would receive for each share of the Bank
common stock you own by dividing $68.00 by a "measurement price," based on the
average of the closing prices of a share of Wells Fargo common stock as reported
on the New York Stock Exchange composite tape for the period of 10 trading days
ending on the day immediately before the special meeting. Under the terms of the
Reorganization Agreement, this measurement price shall be deemed to equal (i)
$37.00, if such average is less than $37.00, and (ii) $41.00, if such average is
greater than $41.00.

    For example, if this average is $35.00, you would receive approximately 1.84
shares of Wells Fargo common stock for each share of Mercantile Bank common
stock you own. If this average is $38.00, you would receive approximately 1.8
shares of Wells Fargo common stock. If this average is $45.00, you
<PAGE>
 
would receive approximately 1.66 shares of Wells Fargo common stock.

    The board of directors of the Bank has concluded that the consolidation is
fair to and in the best interests of the Bank shareholders and unanimously
recommends that the Bank shareholders vote for the approval of the
Reorganization Agreement and the Consolidation Agreement. Alex Sheshunoff & Co.
Investment Banking, the Bank's financial advisor, has delivered to the Bank its
opinion, dated October 9, 1998, that the exchange ratio is fair to the
shareholders of the Bank who will receive Wells Fargo common stock in the 
Consolidation.

    This proxy statement-prospectus describes the proposed acquisitions and
provides specific information concerning the special meeting. Please read these
materials carefully and consider the information contained therein.

    It is important that your shares be represented and voted at the special
meeting regardless of the number of shares you own and whether or not you plan
to attend the special meeting. Please complete and return the enclosed proxy
card to assure that your vote is counted even if you are unable to attend the
special meeting. The affirmative vote of the holders of two-thirds of the
outstanding shares of the Bank common stock entitled to vote at the special
meeting is required for approval of the Reorganization Agreement and the
Consolidation Agreement.



                               Graciela Gutierrez
                               Chief Executive Officer

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

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

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of the Wells Fargo common stock to be
issued or determined if this proxy statement-prospectus is truthful or complete.
Any representation to the contrary is a criminal offense.

    The shares of Wells Fargo common stock offered by this proxy
statement-prospectus are not savings accounts, deposits or other obligations of
any bank or nonbank subsidiary of Wells Fargo & Company and are not insured by
the Federal Deposit Insurance Corporation or any other governmental agency.

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

               Proxy Statement-Prospectus dated February __, 1999.
     First mailed to shareholders of the Bank on or about February __, 1999.
<PAGE>
 
                              MERCANTILE BANK, N.A.
                              835 EAST LEVEE STREET
                            BROWNSVILLE, TEXAS 78520

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

                    NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                         TO BE HELD ON FEBRUARY 24, 1999

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

    NOTICE IS HEREBY GIVEN that a special meeting of shareholders of Mercantile
Bank, National Association (the "Bank") has been called by the board of
directors of the Bank and will be held at the offices of the Bank, 835 East
Levee Street, Brownsville, Texas 78520 on Wednesday, February 24, 1999 at 1:30
p.m., local time.

    The purposes of the special meeting are:

        (1) to consider and vote on a proposal to approve the acquisition of the
    Bank (the "Consolidation") by Wells Fargo & Company ("Wells Fargo"),
    pursuant to an Agreement and Plan of Reorganization (the "Reorganization
    Agreement"), dated as of October 28, 1998, by and among Mercantile Financial
    Enterprises, Inc. ("Mercantile"), the Bank, and Wells Fargo, and a related
    Agreement and Plan of Consolidation, substantially in the form attached as
    Exhibit A-2 to the Reorganization Agreement (the "Consolidation Agreement").

        (2) to transact such other business as may properly come before the
    special meeting or any adjournments or postponements thereof.

    Holders of record of shares of the Bank common stock at the close of
business on January 15, 1999, the record date for the special meeting, are
entitled to notice of and to vote at the special meeting or at any postponements
or adjournments thereof. The affirmative vote of two-thirds of the outstanding
shares of common stock of the Bank is required to approve the Consolidation.

    The board of directors of the Bank has concluded that the Consolidation is
fair to and in the best interests of the Bank and its shareholders and
unanimously recommends that the Bank shareholders vote for the approval of the
Consolidation.

    The terms of the Consolidation and the Wells Fargo common stock to be issued
in the Consolidation are described in detail in the accompanying proxy
statement-prospectus. To ensure that your vote will be counted, please complete,
date and sign the enclosed proxy card and return it promptly in the enclosed
postage-paid envelope, whether or not you currently plan to attend the special
meeting. You may revoke your proxy in the manner described in the accompanying
proxy statement-prospectus at any time before it is voted at the special
meeting.

                                              By Order of the Board of Directors


                                              Graciela Gutierrez
                                              Chief Executive Officer

Brownsville, Texas
February __, 1999
<PAGE>
 
                                TABLE OF CONTENTS


Important Information Delivered with this
Proxy Statement-Prospectus ..................................................  1

Glossary of Important Terms..................................................  2

Questions and Answers About
the Transactions.............................................................  5

Questions and Answers About this
Proxy-Statement-Prospectus...................................................  8

Summary......................................................................  9
   Parties to the Transactions...............................................  9
   Reasons for the Transactions;
     Recommendation of the Board
     of Directors of the Bank................................................ 10
   Opinion of Financial Advisor.............................................. 11
   Required Vote............................................................. 11
   The Transactions.......................................................... 11
   Comparative Per Common Share Data......................................... 17

Selected Historical Financial Information.................................... 19
   Wells Fargo............................................................... 19
   The Bank.................................................................. 19
   Share Prices and Dividends for Wells
     Fargo Common Stock...................................................... 20

Special Meeting of Bank Shareholders ........................................ 21
   Date, Time, and Place of Special Meeting.................................. 21
   Matters to be Considered at the
     Special Meeting......................................................... 22
   Record Date............................................................... 22
   Voting Rights; Votes Required
     for Approval............................................................ 22
   Voting and Revocation of Proxies.......................................... 22
   Solicitation of Proxies................................................... 23
   Security Ownership of Certain
     Beneficial Owners and Management;
     Voting Agreements....................................................... 23

The Transactions............................................................. 23
   Background of and Reasons for the
     Transactions............................................................ 23
   Opinion of Financial Advisor.............................................. 24
   Additional Interests of Bank
     Management in the Consolidation......................................... 29
   Appraisal Rights.......................................................... 30
   Exchange of Certificates.................................................. 31
   Regulatory Approvals...................................................... 32
   Effect on the Bank's Employee
     Benefit Plans........................................................... 33
  Material U.S. Federal Income Tax
     Consequences of the Transactions........................................ 34
   Resale of Wells Fargo Common Stock........................................ 35
   Stock Exchange Listing.................................................... 35
   Accounting Treatment...................................................... 36

The Reorganization Agreement ................................................ 36
   Basic Plan of Reorganization.............................................. 37
   Representations and Warranties............................................ 38
   Certain Covenants......................................................... 38
   Conditions to the Completion of the
     Transactions............................................................ 39
   Termination of the Reorganization
     Agreement............................................................... 40
   Effect of Termination..................................................... 41
   Waiver and Amendment...................................................... 42
   Expenses.................................................................. 42

Comparison of Rights of Holders of
Bank Common Stock and Wells Fargo
Common Stock................................................................. 42
   Capital Stock............................................................. 43
   Rights Plan............................................................... 43
   Directors................................................................. 43
   Amendment of Charter Document
     and Bylaws.............................................................. 44
   Approval of Mergers and Asset Sales....................................... 44
   Preemptive Rights......................................................... 44
   Appraisal Rights.......................................................... 45
   Special Meetings.......................................................... 45
   Directors' Duties......................................................... 45
   Action Without a Meeting.................................................. 46
   Limitation of Director Liability.......................................... 46
   Indemnification of Officers and Directors................................. 46
   Dividends................................................................. 47
   Corporate Governance Procedures;
     Nomination of Directors................................................. 47

                                      (i)
<PAGE>
 
Information About the Entities to be Acquired
   General................................................................... 48
   Legal Proceedings......................................................... 48
   Market Price and Dividends................................................ 48
   Voting Securities and Principal
     Shareholders of Mercantile and
     the Bank................................................................ 49
   Year 2000 Compliance...................................................... 50

Management Discussion and
Analysis of Financial Condition
and Results of Operations.................................................... 51
Results of Operations........................................................ 51
Financial Condition.......................................................... 60
Impact on Inflation, Changing Prices
  and Monetary Policies...................................................... 68

Certain Regulatory and Other
Considerations Pertaining to
Wells Fargo.................................................................. 69
   Bank Regulatory Agencies.................................................. 69
   Bank Holding Company Activities;
     Interstate Banking...................................................... 69
   Dividend Restrictions..................................................... 70
   Holding Company Structure................................................. 71
   Regulatory Capital Standards and
     Related Matters......................................................... 72
   FDIC Insurance............................................................ 74
   Fiscal and Monetary Policies.............................................. 75
   Competition............................................................... 75

Experts...................................................................... 76

Legal Matters................................................................ 76

Information Concerning Wells
Fargo Management............................................................. 76

Where You Can Find More
Information.................................................................. 77

Financial Statements of the Bank.............................................F-1


Appendix A      Agreement and Plan
                of Reorganization
                (including the Agreement
                and Plan of Merger as
                Exhibit A-1).................................................A-1

Appendix B      Agreement and Plan
                of Consolidation.............................................B-1

Appendix C      Opinion of Alex
                Sheshunoff & Co..............................................C-1

Appendix D      United States Code
                Title 12, Section 215,
                paragraphs (a)-(c)...........................................D-1

Appendix E      Banking Circular 259.........................................E-1


                                      (ii)
<PAGE>
 
                      IMPORTANT INFORMATION DELIVERED WITH
                         THIS PROXY STATEMENT-PROSPECTUS


                                     General

This proxy statement-prospectus incorporates important business and financial
information about Wells Fargo & Company (formerly named Norwest Corporation)
included in the documents being delivered together with this proxy
statement-prospectus. The documents containing this information are listed on
page ___.

                           Norwest/Wells Fargo Merger

    On November 2, 1998, Wells Fargo & Company ("old Wells Fargo") merged into
WFC Holdings Corporation ("WFC Holdings"), a wholly-owned subsidiary of Norwest
Corporation. WFC Holdings was the surviving company in the merger. Following
this merger, Norwest Corporation changed its name to "Wells Fargo & Company."

    In this proxy statement-prospectus, unless otherwise indicated, "Wells Fargo
& Company" refers to the legal entity formerly named Norwest Corporation and now
named Wells Fargo & Company.

    The combination of the old Wells Fargo and Norwest Corporation is being
accounted for as a pooling of interests. This means that Norwest Corporation's
historical financial statements incorporated into this document by reference to
Norwest Corporation's annual report on Form 10-K for the year ended December 31,
1997 and quarterly report on Form 10-Q for the quarter ended September 30, 1998
have been restated as if Norwest Corporation and old Wells Fargo had been
combined for the periods presented in these reports. The restated financial
statements are included in the new Wells Fargo's current report on Form 8-K
filed with the Securities and Exchange Commission on January 19, 1999.

    In this proxy statement-prospectus, unless otherwise indicated, the
financial statements of Norwest Corporation have been restated as if Norwest
Corporation and old Wells Fargo had been combined for the periods presented.

    For more information about the combination, you should review the following
documents filed with the Securities and Exchange Commission, each of which is
being delivered with this proxy statement-prospectus:

    *   Proxy Statement-Prospectus of Norwest Corporation and old Wells Fargo
        dated September 11, 1998 forming part of Norwest Corporation's
        Registration Statement on Form S-4 filed with the Securities and
        Exchange Commission on September 11, 1998 (Registration No. 333-63247).

    *   Current Report on Form 8-K dated November 2, 1998 and filed by Wells
        Fargo on November 16, 1998 reporting completion of the merger.

    *   Current Report on Form 8-K dated November 2, 1998 and filed by Wells
        Fargo on January 19, 1999, supplementing Norwest Corporation's Form 10-K
        for 1997 and Form 10-Q for quarter ended September 30, 1998, in light of
        the merger.

                                       1
<PAGE>
 
                           GLOSSARY OF IMPORTANT TERMS

    Following are the meanings of some important terms used in this proxy
statement-prospectus. Each term should be considered in the context in which it
is used. Because the Reorganization Agreement was entered into before Norwest
Corporation changed its name to "Wells Fargo & Company," the term "Wells Fargo
Measurement Price" is referred to in the Reorganization Agreement as the
"Norwest Measurement Price."

Bank................................. Mercantile Bank, National Association, a
                                      wholly-owned banking subsidiary of
                                      Mercantile.

Bank common stock.................... The Bank's common stock, par value $1.00
                                      per share.

Bank Consolidation Value............. The number obtained by dividing the
                                      Nominal Value by 2,739,928, and then
                                      multiplying the result of that division by
                                      110,551.

Bank Holding Company Act............. Bank Holding Company Act of 1956.

Company Market Capitalization........ The price of one share of the common stock
                                      of a given company in the Index Group at
                                      the close of the trading day immediately
                                      preceding the date of the Reorganization
                                      Agreement multiplied by (ii) the number of
                                      shares of common stock of such company
                                      outstanding as of June 30, 1998 (adjusted
                                      for any stock dividend, reclassification,
                                      recapitalization, exchange of shares or
                                      similar transaction between June 30, 1998
                                      and the close of the trading day
                                      immediately preceding the date of the
                                      Reorganization Agreement).

Consolidation........................ The statutory consolidation of Norwest
                                      Interim Bank Mercantile with Bank pursuant
                                      to the terms of the Reorganization
                                      Agreement and the Consolidation Agreement.
                                      The Consolidation is the means by which
                                      Wells Fargo will acquire Bank.

Effective Date of the Consolidation.. The date occurring immediately after the
                                      Effective Date of the Merger on which the
                                      OCC issues its Certificate of Approval for
                                      the Consolidation.

Effective Date of the Merger......... The day on which Articles of Merger for
                                      the Merger have been filed with and
                                      accepted by the Delaware Secretary of
                                      State.

Effective Time of the Consolidation.. 12:01 a.m., on the Effective Date of the
                                      Consolidation.

Effective Time of the Merger......... 11:59 p.m., Wilmington, Delaware time, on
                                      the Effective Date of the Merger.

Exchange Act......................... Securities Exchange Act of 1934.

                                       2
<PAGE>
 
Federal Reserve Board................ Board of Governors of the Federal Reserve
                                      System.

FDI Act.............................. Federal Deposit Insurance Act.

FDIC................................. Federal Deposit Insurance Corporation.

Interstate Banking Act............... Reigle-Neal Interstate Banking and
                                      Branching Act.

Mercantile........................... Mercantile Financial Enterprises, Inc.

Mercantile common stock.............. Mercantile's common stock, par value $1.00
                                      per share.

Merger .............................. The statutory merger of a wholly-owned
                                      subsidiary of Wells Fargo with Mercantile
                                      pursuant to the terms of the
                                      Reorganization Agreement and the Merger
                                      Agreement. The Merger is the means by
                                      which Wells Fargo will acquire Mercantile.

Merger Value......................... $174,000,000 minus the Bank Consolidation
                                      Value.

Nominal Value........................ The number obtained by adding to
                                      $174,000,000 the liabilities, and then
                                      subtracting the cash assets of Mercantile
                                      as of the end of the month that occurs
                                      immediately prior to February 24, 1999,
                                      the date of the special meeting. As of
                                      September 30, 1998, the cash assets and
                                      liabilities of Mercantile were $138,000
                                      and $14,088,000, respectively.

Norwest Interim Bank Mercantile...... A wholly-owned national bank subsidiary to
                                      be formed by Wells Fargo, and contributed
                                      to Mercantile immediately after the
                                      Effective Time of the Merger, which will
                                      then consolidate with the Bank, under the
                                      Bank's name and charter in the
                                      Consolidation.

OCC.................................. Office of the Comptroller of the Currency.

Reorganization Agreement............. The Agreement and Plan of Reorganization
                                      dated as of October 28, 1998 between
                                      Norwest Corporation (now named Wells
                                      Fargo), Mercantile, and the Bank.

SEC.................................. Securities and Exchange Commission.

Securities Act....................... Securities Act of 1933.

Total Market Capitalization.......... The sum of the Company Market
                                      Capitalization for each of the companies
                                      in the Index Group.

Transactions......................... The Merger and the Consolidation.

                                       3
<PAGE>
 
Wells Fargo.......................... Wells Fargo & Company, formerly named
                                      Norwest Corporation, and its consolidated
                                      subsidiaries.

Wells Fargo common stock............. Wells Fargo's common stock, par value
                                      $1-2/3 per share.

Wells Fargo Measurement Price........ The average of the closing prices of a
                                      share of Wells Fargo common stock as
                                      reported on the New York Stock Exchange
                                      Composite Transaction reporting system
                                      during the period of 10 trading days
                                      ending on the day immediately before the
                                      effective date of the written consent by
                                      the sole shareholder of Mercantile and the
                                      day immediately before the special
                                      meeting.

                                       4
<PAGE>
 
                              QUESTIONS AND ANSWERS
                             ABOUT THE TRANSACTIONS

Q:    Why have Mercantile and the Bank agreed to be acquired by Wells Fargo?

A:    The boards of directors of Mercantile and the Bank have identified various
      benefits that are likely to result from the Transactions. The two boards
      of directors believe the Transactions will:

      *     Offer the sole shareholder of Mercantile and the shareholders of the
            Bank the opportunity to acquire a publicly traded equity interest in
            a larger, more diversified financial institution with a history of
            paying dividends and which is looking to expand its presence in
            Southern Texas;

      *     Expand the portfolio of banking products and services offered to
            customers and the Brownsville community and enable the Bank to
            better compete with other banks and financial institutions in the
            market; and

      *     Increase the profitability of the companies involved through cost
            savings, operating efficiencies, economies of scale and stronger
            market positions.

Q:    What do I need to do now?

A:    After carefully reading and considering the information contained in this
      document, please fill out and sign your proxy card. Then mail your signed
      proxy card in the enclosed return envelope as soon as possible so that
      your shares may be represented at the special meeting.


Q:    Should I send in my stock certificates now?

A:    No. After the Transactions are completed, Wells Fargo will send you
      written instructions for exchanging your stock certificates.

Q:    What will I receive for my shares of Bank Common Stock?

A:    Wells Fargo will exchange $174,000,000 of its common stock for all of the
      outstanding shares of Mercantile common stock and Bank common stock. Of
      such amount, shareholders of the Bank other than Mercantile will receive
      the Consolidation Value. The sole Mercantile shareholder will receive the
      Merger Value. Shareholders should refer to the "Glossary of Important
      Terms" to review the definitions of "Consolidation Value" and "Merger
      Value" and other related definitions.

Q:    How many shares of Wells Fargo common stock will I receive?

A     As a result of the Consolidation, each outstanding share of the Bank
      common stock (other than shares held by Mercantile) will be converted
      into:

      *     If the Wells Fargo Measurement Price is equal to or less than
            $37.00, the number of shares of Wells Fargo common stock determined
            by (i) dividing the Bank Consolidation Value by $37.00, and (ii)
            dividing the result thereof by the total number of outstanding
            shares of the Bank common stock;

                                       5
<PAGE>
 
      *     If the Wells Fargo Measurement Price is between $37.00 and $41.00,
            the number of shares of Wells Fargo common stock determined by (i)
            dividing the Bank Consolidation Value by the Wells Fargo Measurement
            Price, and (ii) dividing the result thereof by the total number of
            outstanding shares of the Bank common stock; and

      *     If the Wells Fargo Measurement Price is equal to or greater than
            $41.00, the number of shares of Wells Fargo common stock determined
            by (i) dividing the Bank Consolidation Value by $41.00, and (ii)
            dividing the result thereof by the total number of outstanding
            shares of the Bank common stock.

      The shares of Bank common stock held by Mercantile will be indirectly
      acquired by Wells Fargo when it acquires 100% of Mercantile's common stock
      in the Merger. Mercantile will therefore not receive, and the shares of
      Bank common stock held by Mercantile will not be exchanged for, any
      additional shares of Wells Fargo common stock in the Consolidation.

      As a result of the Merger, each outstanding share of Mercantile common
      stock will be converted into:

      *     If the Wells Fargo Measurement Price is equal to or less than $37.00
            the number of shares of Wells Fargo common stock determined by (i)
            dividing the Merger Value by $37.00, and (ii) dividing the result
            thereof by the total number of outstanding shares of Mercantile
            common stock;

      *     If the Wells Fargo Measurement Price is between $37.00 and $41.00,
            the number of shares of Wells Fargo common stock determined by (i)
            dividing the Merger Value by the Wells Fargo Measurement Price, and
            (ii) dividing the result thereof by the total number of outstanding
            shares of Mercantile common stock; and

      *     If the Wells Fargo Measurement Price is equal to or greater than
            $41.00, the number of shares of Wells Fargo common stock determined
            by (i) dividing the Merger Value by $41.00, and (ii) dividing the
            result thereof by the total number of outstanding shares of
            Mercantile common stock.

Q:    What are the tax consequences to the sole Mercantile shareholder and the
      Bank shareholders of the Transactions?

A:    The Merger and the Consolidation have been structured so that the sole
      Mercantile shareholder and the Bank shareholders generally will not
      recognize any gain or loss for U.S. federal income tax purposes as a
      result of the Transactions (except for cash received in lieu of fractional
      shares). The Transactions are conditioned on the receipt by Mercantile and
      the Bank of a legal opinion to this effect.

      This tax treatment may not apply to certain shareholders. You should
      consult your own tax advisor for a full understanding of the Transactions'
      tax consequences to you.

Q:    When will the Transactions be completed?

A:    Mercantile, the Bank, and Wells Fargo expect to complete the Transactions
      within a few days after obtaining the requisite consent to the Merger by
      the sole shareholder of Mercantile and approval of the Consolidation by
      the Bank shareholders at the special meeting, assuming the required
      regulatory

                                       6
<PAGE>
 
      approvals have been received by then and certain other conditions set
      forth in the Reorganization Agreement are satisfied.

Q:    What rights do I have if I dissent from the Consolidation?

A:    You have a right to an appraisal of the fair value of your Bank common
      stock if the Consolidation is otherwise approved. See "The
      Transactions-Appraisal Rights" for information on your appraisal rights
      and how to exercise them.

                                       7
<PAGE>
 
                        QUESTIONS AND ANSWERS ABOUT THIS
                           PROXY STATEMENT-PROSPECTUS


Q:    What is the purpose of this document?

A:    This document serves as a proxy statement for the Bank and as a prospectus
      of Wells Fargo. As a proxy statement it is being provided to Bank
      shareholders because the Bank's board of directors is soliciting their
      proxy to use at the special meeting. As a prospectus, it is being provided
      to both the sole Mercantile shareholder and the Bank shareholders because
      Wells Fargo will exchange shares of its common stock for shares of
      Mercantile common stock and Bank common stock.


Q:    Do I need to read the entire document, including the appendices?

A:    Absolutely. Much of this proxy statement-prospectus summarizes information
      that is set forth in greater detail elsewhere in this document or in the
      appendices to this document. Each summary is qualified in its entirety by
      reference to the information being summarized. For example, the summary of
      the terms of the Reorganization Agreement is qualified in its entirety by
      reference to the full text of the Reorganization Agreement, a copy of
      which is included as Appendix A. If there are any differences, the
      information in the Reorganization Agreement will control over the
      information in the summary. As a result, to fully understand the
      Transactions and your rights as a Bank shareholder, you will need to read
      carefully this entire document including appendices.

                                       8
<PAGE>
 
                                           SUMMARY

    This summary highlights selected information from this document and may not
contain all of the information that is important to you. To understand the
Transactions fully, and for a more complete description of the legal terms of
the Transactions, you should carefully read this document and the other
information available to you. See "Where You Can Find More Information."

 Parties to the Transactions

    Wells Fargo & Company.................. Through its subsidiaries and        
    420 Montgomery Street                   affiliates, Wells Fargo provides    
    San Francisco, California  94163        retail, commercial, real estate and 
    (415) 477-1000                          mortgage banking, asset management  
                                            and consumer finance, as well as a  
                                            variety of other financial services,
                                            including equipment leasing,        
                                            agricultural finance, securities    
                                            brokerage and investment banking,   
                                            insurance agency services, computer 
                                            and data processing services, trust 
                                            services, mortgage-backed securities
                                            servicing, and venture capital      
                                            investment.                         

                                            Wells Fargo is a diversified
                                            financial services company. Through
                                            its subsidiaries and affiliates,
                                            Wells Fargo provides retail,
                                            commercial, real estate and mortgage
                                            banking, asset management and
                                            consumer finance, as well as a
                                            variety of other financial services,
                                            including equipment leasing,
                                            agricultural finance, securities
                                            brokerage and investment banking,
                                            insurance agency services, computer
                                            and data processing services, trust
                                            services, mortgage-backed securities
                                            servicing, and venture capital
                                            investment.

                                            At September 30, 1998, Wells Fargo
                                            had assets of $195.9 billion,
                                            deposits of $130.0 billion and
                                            stockholders' equity of $20.6
                                            billion. Based on assets at
                                            September 30, 1998, Wells Fargo was
                                            the seventh largest commercial
                                            banking organization in the United
                                            States.

    Mercantile Financial Enterprises, Inc.. Mercantile is incorporated in      
    835 East Levee Street                   Delaware and is a wholly owned     
    Brownsville, Texas  78520               subsidiary of Hemisphere Financial 
     (956) 548-6248                         Ltd., a privately held British     
                                            Virgin Islands corporation.        
                                            Mercantile currently holds 96.0% of
                                            the outstanding common stock of the
                                            Bank, which constitutes            
                                            substantially all of Mercantile's  
                                            assets. Other than holding common  
                                            stock of the Bank, Mercantile does 
                                            not actively engage in any other   
                                            investment or business activities. 

                                       9
<PAGE>
 
    Mercantile Bank, National Association.. The Bank is a national banking      
    835 East Levee Street                   association and one of the largest  
    Brownsville, Texas  78520               independently owned banks in South  
    (956) 546-2421                          Texas providing continuous personal 
                                            commitment, financial strength and  
                                            export services to the Rio Grande   
                                            Valley, the Coastal bend and        
                                            northern Mexico. The Bank currently 
                                            operates a total of twelve offices  
                                            in South Texas, of which two are    
                                            located in Brownsville, seven are   
                                            located in Corpus Christi, one in   
                                            Portland, one in Harlingen, and one 
                                            in Ingleside. At September 30, 1998,
                                            the Bank had approximately $841.2   
                                            million in total assets and $658.7  
                                            million in total deposits.          

 Reasons for the Transactions;
 Recommendation of the Board of
 Directors of the Bank
 (see page __)............................. The boards of directors of
                                            Mercantile and Bank have identified
                                            various benefits that are likely to
                                            result from the Transactions. The
                                            two boards of directors believe the
                                            Transactions will:

                                            * Offer the sole shareholder of
                                              Mercantile and shareholders of the
                                              Bank the opportunity to acquire a
                                              publicly traded equity interest in
                                              a larger, more diversified
                                              financial institution with a
                                              history of paying dividends and
                                              which is looking to expand its
                                              presence in Southern Texas;

                                            * Expand the portfolio of banking
                                              products and services offered to
                                              customers and the Brownsville
                                              community and enable the Bank to
                                              better compete with other banks
                                              and financial institutions in the
                                              market; and

                                            * Increase the profitability of the
                                              companies involved through cost
                                              savings, operating efficiencies,
                                              economies of scale and stronger
                                              market positions.

                                            The Bank's board of directors
                                            believes that the Consolidation is
                                            in the best interest of Bank
                                            shareholders and has authorized
                                            consummation of the Consolidation
                                            contemplated by the Consolidation
                                            Agreement, subject to approval of
                                            Bank shareholders and the
                                            satisfaction of certain other
                                            conditions.
                                            THE BANK'S BOARD OF DIRECTORS
                                            UNANIMOUSLY RECOMMENDS THAT BANK
                                            SHAREHOLDERS VOTE "FOR" THE PROPOSAL
                                            TO ADOPT THE REORGANIZATION
                                            AGREEMENT AND THE CONSOLIDATION
                                            AGREEMENT.

                                       10
<PAGE>
 
 Opinion of Financial Advisor.............. In deciding to approve the
                                            Consolidation, the board of
                                            directors of the Bank considered the
                                            opinion of Alex Sheshunoff & Co.
                                            Investment Banking, its financial
                                            advisors, as to the fairness of the
                                            consideration to be received by the
                                            Bank's minority shareholders
                                            contained in the Reorganization
                                            Agreement from a financial point of
                                            view. The opinion is included as
                                            Appendix C to this proxy
                                            statement-prospectus, and we
                                            encourage you to read it.

 Required Vote............................. To approve the Consolidation,
                                            two-thirds of the outstanding voting
                                            power of the Bank's shares must vote
                                            to approve the Reorganization
                                            Agreement and the Consolidation
                                            Agreement. Pursuant to a voting
                                            agreement entered into with Wells
                                            Fargo, Mercantile has agreed to vote
                                            all of the shares of Bank common
                                            stock it holds, which constitutes
                                            approximately 96.0% of the
                                            outstanding Bank common stock, for
                                            approval of the Reorganization
                                            Agreement and the Consolidation
                                            Agreement.

 The Transactions

    The Merger............................. In the Merger, a newly-formed,
                                            wholly-owned subsidiary of Wells
                                            Fargo will merge with Mercantile.
                                            Mercantile will be the surviving
                                            entity in the Merger and will become
                                            a wholly-owned subsidiary of Wells
                                            Fargo.

    The Consolidation...................... In the Consolidation, Wells Fargo
                                            will contribute to Mercantile
                                            immediately after the Merger is
                                            effective, Norwest Interim Bank
                                            Mercantile, which will then
                                            consolidate with the Bank under the
                                            name and charter of the Bank.

    What the Bank Shareholders Will
    Receive (see page __).................. As a result of the Consolidation,
                                            each outstanding share of Bank
                                            common stock (other than shares held
                                            by Mercantile) will be converted
                                            into a number of shares of Wells
                                            Fargo common stock, computed using
                                            the following formula:

                                            * If the Wells Fargo Measurement
                                              Price is equal to or less than
                                              $37.00, the number of shares of
                                              Wells Fargo common stock
                                              determined by (i) dividing the
                                              Consolidation Value by $37.00, and
                                              (ii) dividing the result thereof
                                              by the total number of outstanding
                                              shares of the Bank common stock;

                                       11
<PAGE>
 
                                            * If the Wells Fargo Measurement
                                              Price is between $37.00 and
                                              $41.00, the number of shares of
                                              Wells Fargo common stock
                                              determined by (i) dividing the
                                              Consolidation Value by the Wells
                                              Fargo Measurement Price, and (ii)
                                              dividing the result thereof by the
                                              total number of outstanding shares
                                              of the Bank common stock; and

                                            * If the Wells Fargo Measurement
                                              Price is equal to or greater than
                                              $41.00, the number of shares of
                                              Wells Fargo common stock
                                              determined by (i) dividing the
                                              Consolidation Value by $41.00, and
                                              (ii) dividing the result thereof
                                              by the total number of outstanding
                                              shares of the Bank common stock.

                                            The shares of Bank common stock held
                                            by Mercantile will be indirectly
                                            acquired by Wells Fargo when it
                                            acquires 100% of Mercantile's common
                                            stock in the Merger. Mercantile will
                                            therefore not receive, and the
                                            shares of Bank common stock held by
                                            Mercantile will not be exchanged
                                            for, any additional shares of Wells
                                            Fargo common stock in the
                                            Consolidation.

                                            As a result of the Merger, each
                                            outstanding share of Mercantile
                                            common stock will be converted into
                                            a number of shares of Wells Fargo
                                            common stock, computed using the
                                            following formula:

                                            * If the Wells Fargo Measurement
                                              Price is equal to or less than
                                              $37.00 the number of shares of
                                              Wells Fargo common stock
                                              determined by (i) dividing the
                                              Merger Value by $37.00, and (ii)
                                              dividing the result thereof by the
                                              total number of outstanding shares
                                              of Mercantile common stock;

                                            * If the Wells Fargo Measurement
                                              Price is between $37.00 and
                                              $41.00, the number of shares of
                                              Wells Fargo common stock
                                              determined by (i) dividing the
                                              Merger Value by the Wells Fargo
                                              Measurement Price, and (ii)
                                              dividing the result thereof by the
                                              total number of outstanding shares
                                              of Mercantile common stock; and

                                            * If the Wells Fargo Measurement
                                              Price is equal to or greater than
                                              $41.00, the number of shares of
                                              Wells Fargo common stock
                                              determined by (i) dividing the
                                              Merger Value by $41.00, and (ii)
                                              dividing the result thereof by the
                                              total number of outstanding shares
                                              of Mercantile common stock.

                                       12
<PAGE>
 
                                            Wells Fargo will not issue
                                            fractional shares in the
                                            Transactions. If the total number of
                                            shares of Wells Fargo common stock
                                            you are entitled to receive does not
                                            equal a whole number, Wells Fargo
                                            will pay you cash instead of the
                                            fractional share.

    Management and Operations of the
    Bank After the Consolidation........... When the Consolidation is complete,
                                            Wells Fargo will own all of the
                                            outstanding shares of Bank common
                                            stock. As a result, Wells Fargo will
                                            be able to elect or appoint all of
                                            the directors and officers of the
                                            Bank.

                                            As a result of the Consolidation,
                                            the Bank will become a subsidiary of
                                            Wells Fargo. Wells Fargo expects
                                            that after the Consolidation, the
                                            Bank will operate at its current
                                            location, providing products and
                                            services offered by Wells Fargo
                                            affiliates.

    Additional Interests of the Bank's
    Management (see page __)............... In considering the recommendation of
                                            the board of directors of the Bank
                                            to approve the Reorganization
                                            Agreement and the Consolidation
                                            Agreement, you should be aware that
                                            the Bank's directors and executive
                                            officers have interests in the
                                            Consolidation that are difference
                                            from, or in addition to, the
                                            interests of Bank shareholders
                                            generally. These interests include,
                                            among other things, the following:

                                            * Wells Fargo has entered into
                                              employment agreements with Ms.
                                              Graciela Gutierrez and Messrs.
                                              James A. Scott and Edward J.
                                              Bacak, pursuant to which each of
                                              them will be employed by Wells
                                              Fargo for a one-year period
                                              following the effective date of
                                              the Consolidation.

                                            * The employment agreement of Ms.
                                              Gutierrez and Messrs. Scott and
                                              Bacak contain economic incentives
                                              to refrain from competing with
                                              Wells Fargo for a period of one
                                              year after the terms of their
                                              respective employment agreements
                                              expire.

                                            The Bank's board of directors was
                                            aware of these interests when it
                                            approved the Consolidation.

                                       13
<PAGE>
 
    Conditions to the Transactions
    (see page __).......................... A number of conditions must be
                                            satisfied before the Transactions
                                            can be completed, including the
                                            following:

                                            * The Merger must be consented to
                                              in writing by the sole shareholder
                                              of the outstanding Mercantile
                                              common stock. Under a voting
                                              agreement with Wells Fargo, the
                                              sole Mercantile shareholder has
                                              agreed to consent to the Merger.

                                            * The Consolidation must be approved
                                              by the holders of at least
                                              two-thirds of the outstanding Bank
                                              common stock. Under a voting
                                              agreement with Wells Fargo,
                                              Mercantile has agreed to vote all
                                              of its shares of Bank common stock
                                              in favor of the Consolidation.

                                            * The Transactions must be approved
                                              by governmental authorities.

                                            Mercantile and the Bank must receive
                                            a legal opinion that their
                                            shareholders will not recognize any
                                            gain or loss for federal income tax
                                            purposes as a result of the Merger
                                            and the Consolidation (except for
                                            cash received in lieu of fractional
                                            shares).

                                            * Wells Fargo must receive an
                                              opinion from Mercantile's and the
                                              Bank's outside auditors that there
                                              are no facts that would prevent
                                              Wells Fargo from accounting for
                                              the Transactions as a pooling of
                                              interests.

                                            * There cannot be any change since
                                              December 31, 1997 that has had, or
                                              might reasonably be expected to
                                              have, a material adverse effect on
                                              Mercantile and the Bank taken as a
                                              whole.

                                            * Either the Bank must be in full
                                              compliance with current Year 2000
                                              requirements or there must not be
                                              any feature of the Bank's data
                                              processing, operating, or platform
                                              systems that would prevent those
                                              systems from being converted to
                                              Wells Fargo's systems.

                                            Some of the conditions to the
                                            Transactions are subject to
                                            exceptions and/or to a "materiality"
                                            standard. Some conditions may also
                                            be waived by the party entitled to
                                            assert the condition.

                                       14
<PAGE>
 
    Regulatory Approvals (see page __)..... The Merger is subject to the prior
                                            approval of the Federal Reserve
                                            Board, as the regulator of bank
                                            holding companies such as Wells
                                            Fargo. The Consolidation is also
                                            subject to the approval of the OCC,
                                            as the regulator of the Bank. The
                                            Federal Reserve Board approved the
                                            Merger on January 27, 1999. OCC
                                            approval of the Consolidation has
                                            not yet been received as of the date
                                            of this proxy statement-prospectus.

                                            Because Wells Fargo will acquire
                                            control of the Bank in the
                                            Consolidation, Wells Fargo is also
                                            required to notify the Texas
                                            Division of Banking.

                                            The approval of an application means
                                            only that the regulatory criteria
                                            for approval have been satisfied or
                                            waived. It does not mean that the
                                            approving authority has determined
                                            that the consideration to be
                                            received by the sole shareholder of
                                            Mercantile and the Bank shareholders
                                            (other than Mercantile) is fair.
                                            Regulatory approval does not
                                            constitute an endorsement or
                                            recommendation of the Transactions.

    Termination of the Reorganization
    Agreement (see page __)................ Wells Fargo, Mercantile, and the
                                            Bank can mutually agree to terminate
                                            the Reorganization Agreement without
                                            completing the Transactions. Also,
                                            either party can terminate the
                                            Reorganization Agreement under the
                                            following circumstances:

                                            * if a court or other governmental
                                              authority prohibits the Merger; or

                                            * if the Merger is not completed by
                                              April 30, 1999, unless the failure
                                              to complete the Merger on or
                                              before that date is the fault of
                                              the party seeking to terminate.
                                              Mercantile can terminate the
                                              Reorganization Agreement within
                                              five business days after the end
                                              of the end of the Index
                                              Measurement Period if both the
                                              Wells Fargo Measurement Price is
                                              less than $28.00 and the number
                                              obtained by dividing $36.1875 (the
                                              closing price of one share of
                                              Wells Fargo common stock on
                                              October 27, 1998, the trading day
                                              before the Reorganization
                                              Agreement was signed, is less than
                                              the number obtained by dividing
                                              the Final Index Price by the
                                              Initial Index Price, and then
                                              subtracting 15%. Shareholders
                                              should refer to (i) the "Glossary
                                              of Important Terms" to review the
                                              definition of "Wells Fargo
                                              Measurement

                                       15
<PAGE>
 
                                              Price," and (ii) to "Termination
                                              of the Reorganization
                                              Agreement-Termination by
                                              Mercantile" (see page __) for the
                                              definitions of "Index Measurement
                                              Period," "Final Index Price," and
                                              "Initial Index Price," and other
                                              related definitions.

    Accounting Treatment (see page __)..... Wells Fargo expects to account for
                                            the Transactions under the pooling
                                            method of accounting, assuming all
                                            of the criteria for a pooling
                                            transaction are satisfied. Under the
                                            pooling of interests accounting
                                            method, Wells Fargo will carry
                                            forward the assets and liabilities
                                            of Mercantile and the Bank at their
                                            historical recorded values. Because
                                            the Transactions are not material to
                                            the consolidated financial
                                            statements of Wells Fargo, Wells
                                            Fargo will not restate its balance
                                            sheet amounts and results of
                                            operations for prior periods to
                                            reflect the combination of
                                            Mercantile and the Bank with Wells
                                            Fargo.

    Appraisal Rights (see page __ and
    Appendix B)............................ Bank shareholders who dissent from
                                            the Consolidation are entitled to an
                                            appraisal of the value of their
                                            shares of Bank common stock. To
                                            exercise this right, dissenting
                                            shareholders must follow the
                                            procedures outlined in Appendix D.
                                            Failure to comply strictly with
                                            these procedures will result in the
                                            forfeiture of dissenters' rights.

    U.S. Federal Income Tax
    Consequences (see page __)............. The Merger and the Consolidation
                                            have been structured so that the
                                            sole Mercantile shareholder and the
                                            Bank shareholders generally will not
                                            recognize any gain or loss for U.S.
                                            federal income tax purposes as a
                                            result of the Transactions (except
                                            for cash received in lieu of
                                            fractional shares). The Transactions
                                            are conditioned on the receipt by
                                            Mercantile and the Bank of a legal
                                            opinion to this effect.

                                            This tax treatment may not apply to
                                            certain shareholders. You should
                                            consult your own tax advisor for a
                                            full understanding of the
                                            Transactions' tax consequences to 
                                            you.

                                       16
<PAGE>
 
    Market Information (see page __)....... Wells Fargo common stock is listed
                                            on the New York Stock Exchange and
                                            the Chicago Stock Exchange under the
                                            symbol "WFC." Before November 3,
                                            1998, the common stock traded under
                                            the symbol "NOB." The symbol was
                                            changed following the combination of
                                            Norwest Corporation and old Wells
                                            Fargo on November 2, 1998.

                                            On October 27, 1998, the last full
                                            trading day before Mercantile, the
                                            Bank, and Wells Fargo signed the
                                            Reorganization Agreement, Wells
                                            Fargo common stock closed at
                                            $36.1875 per share. On February __,
                                            1999, Wells Fargo common stock
                                            closed at $___ per share.

                                            There is no public market for
                                            Mercantile common stock or Bank
                                            common stock.

 Certain Regulatory and Other               Wells Fargo, its banking           
 Considerations Pertaining to               subsidiaries, and many of its      
 Wells Fargo (see page __)                  nonbanking subsidiaries are subject
                                            to extensive regulation by a number
                                            of federal and state agencies. This
                                            regulation may affect, among other 
                                            things, Wells Fargo's earnings     
                                            and/or restrict its ability to pay 
                                            dividends on Wells Fargo common    
                                            stock.                             


Comparative Per Common Share Data

    The following table presents selected comparative per common share data for
Wells Fargo common stock on a historical and pro forma combined basis and for
Bank common stock on a historical and pro forma equivalent basis. The historical
information for Wells Fargo has been restated to reflect the combination of
Norwest Corporation and old Wells Fargo under the "pooling of interests"
accounting method.

    The pro forma information in the table assumes that Wells Fargo will
exchange approximately 1.8 shares of its common stock for each share of Bank
common stock not held by Mercantile. This is the "assumed exchange ratio" that
would result if the Wells Fargo Measurement Price were $38.00 and the Bank
Consolidation Value is $187,950,000. See "The Reorganization Agreement-Basic
Plan of Reorganization." The pro forma information also assumes the
Consolidation is accounted for using the pooling method of accounting. See "The
Transactions-Accounting Treatment."

    As you review the table, keep the following in mind:

    *   Pro Forma Combined Book Value. The pro forma combined book value per
        share of Wells Fargo common stock represents the historical total
        combined common stockholders' equity for Wells Fargo and the Bank
        divided by total pro forma common shares of the combined entities. The
        pro forma equivalent book value per share of Bank common stock
        represents the pro forma combined book value per share of Wells Fargo
        common stock multiplied by the assumed exchange ratio of 1.8.

                                       17
<PAGE>
 
    *   Dividends Declared. This information assumes no changes in cash
        dividends per share by Wells Fargo. The pro forma equivalent dividends
        per share of Bank common stock represent cash dividends declared per
        share of Wells Fargo common stock multiplied by the assumed exchange
        ratio.

    *   Pro Forma Combined Net Income. The pro forma combined net income per
        share of Wells Fargo common stock (based on weighted average number of
        common and common equivalent shares) is the combined historical net
        income for Wells Fargo and the Bank divided by the average pro forma
        common and common equivalent shares of the combined entities. The pro
        forma equivalent net income per share of Bank common stock represents
        the pro forma combined net income per share multiplied by the assumed
        exchange ratio.

    The information in the table should be read with (a) the selected historical
information (and related notes) for Wells Fargo and the Bank appearing elsewhere
in this proxy statement-prospectus, (b) the complete financial statements of the
Bank appearing elsewhere in this proxy statement-prospectus, and (c) the
restated financial statements of Wells Fargo included in the documents
incorporated by reference in this proxy statement-prospectus. See "Where You Can
Find More Information." The information in the table is not necessarily
indicative of the results of the future operations of the combined entity or the
actual results that would have occurred had the Transactions become effective
prior to the periods indicated.

                                      Wells Fargo               Bank
                                      common stock           common stock
                                  ---------------------  -----------------------
                                              Pro Forma              Pro Forma
                                  Historical  Combined   Historical  Equivalent
                                  ----------  ---------  ----------  ----------
   BOOK VALUE:
     09/30/98                     $  12.40      12.42       33.02      22.36
     12/31/97                        11.92      11.94       30.10      21.49

   DIVIDENDS DECLARED:
     Nine Months Ended 09/30/98      0.515      0.515         --       0.927
     Year Ended 12/31/97             0.615      0.615         --       1.107
     Year Ended 12/31/96             0.525      0.525        1.000     0.945
     Year Ended 12/31/95             0.450      0.450         --       0.810

   NET INCOME:
   Basic:
     Nine Months Ended 09/30/98       1.31       1.31        2.15       2.36
     Year Ended 12/31/97              1.50       1.50        2.85       2.70
     Year Ended 12/31/96              1.38       1.38        2.95       2.48
     Year Ended 12/31/95              1.66       1.66        3.03       2.99

   Diluted:
     Nine Months 0 9/30/98            1.29       1.29        2.15       2.32
     Year Ended 12/31/97              1.48       1.48        2.85       2.66
     Year Ended 12/31/96              1.36       1.36        2.95       2.45
     Year Ended 12/31/95              1.62       1.62        3.03       2.92

                                       18
<PAGE>
 
                    Selected Historical Financial Information

Wells Fargo

    The following selected financial information is to aid you in your analysis
of the financial aspects of the Consolidation. Except for the balance sheet data
for September 30, 1997, the information for Wells Fargo is derived from
information contained in its current report on Form 8-K filed with the SEC on
January 19, 1999 and should be read with that information. A copy of the current
report on Form 8-K, which is incorporated by reference, is being delivered to
Bank shareholders with this proxy statement-prospectus. See "Where You Can Find
More Information." The balance sheet data for September 30, 1997 for Wells Fargo
is derived from the quarterly reports on Form 10-Q for the quarter ended
September 30, 1997 of Norwest Corporation and old Wells Fargo. The information
for the Bank is derived from its historical financial statements (and related
notes) contained elsewhere in this proxy statement-prospectus.


                     Wells Fargo & Company and Subsidiaries

<TABLE>
<CAPTION>
                                       Nine Months Ended
                                         September 30                Years Ended December 31
                                       ------------------  ------------------------------------------------
                                         1998      1997      1997      1996      1995      1994      1993
                                       --------  --------  --------  --------  --------  --------  --------
<S>                                    <C>         <C>       <C>       <C>        <C>       <C>       <C>  
 (In millions, except per share data)
INCOME STATEMENT DATA
    Interest income .................  $ 10,458    10,159    13,602    12,841     9,802     8,159     7,707
    Interest expense ................     3,769     3,691     4,954     4,619     3,879     2,745     2,547
                                       --------  --------  --------  --------  --------  --------  --------
    Net interest income .............     6,689     6,468     8,648     8,222     5,923     5,414     5,160
    Provision for credit losses .....       921       799     1,140       500       312       365       708
    Non-interest income .............     4,815     4,138     5,599     4,724     3,141     2,805     2,640
    Non-interest expenses ...........     7,042     6,675     8,914     8,679     5,551     5,217     5,183
                                       --------  --------  --------  --------  --------  --------  --------
    Income before income taxes ......     3,541     3,132     4,193     3,767     3,201     2,637     1,909
    Income tax expense ..............     1,397     1,283     1,694     1,539     1,213       995       779
                                       --------  --------  --------  --------  --------  --------  --------
    Net income ......................  $  2,144     1,849     2,499     2,228     1,988     1,642     1,130
                                       ========  ========  ========  ========  ========  ========  ========

PER COMMON SHARE DATA
    Net income:
       Basic ........................  $   1.31      1.11      1.50      1.38      1.66      1.40      1.85
       Diluted ......................      1.29      1.09      1.48      1.36      1.62      1.36      1.74
    Dividends declared ..............     0.515     0.450     0.615     0.525     0.450     0.383     0.320

BALANCE SHEET DATA
    At period end:
       Total assets .................  $195,863   182,907   185,685   188,633   122,200   112,674   107,170
       Long-term debt ...............    18,486    17,516    17,335    18,142    16,726    12,039    11,072
       Total stockholders' equity ...    20,558    19,743    19,778    20,051     9,239     7,629     7,947
</TABLE>

The Bank

    The following selected financial data for the Bank should be read in
conjunction with the Financial Statements of the Bank and the Notes thereto and
the information contained in "Management's Discussion and Analysis of Financial
Condition and Results of Operations of the Bank." The selected financial data at
December 31 for each of the years 1993 through 1997 have been derived from the
Bank's Financial Statements which have been audited by Burton, McCumber &
Cortez, L.L.P., independent public accountants. The selected financial data at
and for the nine months ended September 30, 1998 and 1997 have been derived from
financial statements of the Bank which have not

                                       19
<PAGE>
 
been audited but, in the opinion of management, contain all adjustments
(consisting of normal recurring adjustments) necessary to present fairly the
financial position and results of operations of the Bank at and for those time
periods.

    Because Mercantile does not conduct any other investment or business
activities other than holding approximately 96.0% of the outstanding Bank common
stock, Mercantile's selected financial data is materially the same as that of
the Bank's. Instead of including Mercantile's selected financial data, reference
is hereby made to the selected financial data of the Bank below.

<TABLE>
<CAPTION>
                                          Nine Months
                                       Ended September 30,                 Year Ended December 31,
                                      --------------------  -----------------------------------------------------
                                         1998       1997       1997       1996       1995       1994       1993
                                      ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                        (In thousands except per share amounts)
<S>                                   <C>        <C>        <C>        <C>        <C>        <C>        <C>      
INCOME STATEMENT DATA
     Interest income                  $  41,603  $  40,648  $  55,288  $  54,318  $  54,414  $  46,789  $  41,541
     Interest expense                    21,187     20,548     27,720     26,753     26,315     18,632     16,632
                                      ---------  ---------  ---------  ---------  ---------  ---------  ---------

       Net interest income               20,416     20,100     27,568     27,565     28,099     28,157     24,909

     Provision for loan losses              575        525        845        263        100        265     (1,285)
     Non-interest income                  5,020      4,993      6,447      5,334      7,078      8,060      8,190
     Non-interest expense                16,252     16,622     22,005     22,028     23,019     22,407     22,917
                                      ---------  ---------  ---------  ---------  ---------  ---------  ---------

       Income before income taxes         8,609      7,946     11,165     10,608     12,058     13,545     11,467
     Income taxes                         2,725      2,403      3,364      2,537      3,778      4,333      3,540
                                      ---------  ---------  ---------  ---------  ---------  ---------  ---------

       Net income                     $   5,884  $   5,543  $   7,801  $   8,071  $   8,280  $   9,212  $   7,927
                                      =========  =========  =========  =========  =========  =========  =========

BASIC EARNINGS PER SHARE
     Net income per share:            $    2.15  $    2.02  $    2.85  $    2.95  $    3.03  $    3.38  $    2.98
                                      =========  =========  =========  =========  =========  =========  =========

   Dividends declared per
   common share                       $      --  $      --  $      --  $    1.00  $      --  $      --  $      --
                                      =========  =========  =========  =========  =========  =========  =========

BALANCE SHEET DATA
   At end of period:
          Total assets                $ 841,174  $ 807,673  $ 862,436  $ 834,281  $ 812,903  $ 758,134  $ 774,726
          Total liabilities             750,710    728,027    779,974    761,906    743,838    708,083    723,319
          Total shareholders' equity     90,464     79,646     82,462     72,375     69,065     50,051     51,407
</TABLE>

Share Prices and Dividends for Wells Fargo Common Stock

    The following table sets forth the high and low sales prices per share of
the Wells Fargo common stock, and the cash dividends paid on Wells Fargo common
stock, for the quarterly periods indicated. Wells Fargo common stock is listed
on the New York Stock Exchange and the Chicago Stock Exchange under the symbol
"WFC." Before November 3, 1998, the common stock was traded under the symbol
"NOB." The symbol was changed following the combination of Norwest Corporation
and old Wells Fargo on November 2, 1998. The prices for Wells Fargo common stock
are as reported on the New York Stock Exchange. The cash dividend and stock
price information for 1996 and the first three quarters of 1997 has been
adjusted to reflect the two-for-one split, effected in the form of a 100% stock
dividend, of Wells Fargo common stock on October 10, 1997. There is no public
market for Mercantile or Bank common stock.

                                       20
<PAGE>
 
                                            Wells Fargo Common Stock
                                            ------------------------
                                        High           Low         Dividends
                                        ----           ---         ---------
          1996
             First Quarter             18.5625       15.2500         0.120
             Second Quarter            18.7500       16.5000         0.135
             Third Quarter             20.5000       16.0000         0.135
             Fourth Quarter            23.4375       20.3750         0.135

          1997
             First Quarter             26.6250       21.3750         0.150
             Second Quarter            29.6250       22.1875         0.150
             Third Quarter             32.1563       28.1250         0.150
             Fourth Quarter            39.5000       29.7500         0.165

           1998
             First Quarter             43.8750       34.7500         0.165
             Second Quarter            43.7500       34.0000         0.165
             Third Quarter             39.7500       27.5000         0.185
             Fourth Quarter            40.8800       30.1900         0.185

          1999
             First Quarter                                              --
             (through January 31,
              1999)

    The timing and amount of future dividends will depend on earnings, cash
requirements, the financial condition of Wells Fargo and its subsidiaries,
applicable government regulations and other factors deemed relevant by Wells
Fargo's board of directors. As described in "Certain Regulatory Considerations
Pertaining to Wells Fargo - Dividend Restrictions," various federal and state
laws limit the ability of affiliate banks to pay dividends to Wells Fargo.
Because of limitations on the ability of Wells Fargo Bank, N.A. to pay
dividends, OCC approval will likely be required before Wells Fargo Bank, N.A.
may pay dividends to the parent company. See "Certain Regulatory and Other
Considerations Pertaining to Wells Fargo-Dividend Restrictions."



                      SPECIAL MEETING OF BANK SHAREHOLDERS

    The Bank is sending you this proxy statement-prospectus to provide you with
information concerning the Consolidation and to solicit your proxy for use at
the special meeting. At the special meeting, Bank shareholders will be asked to
approve the Reorganization Agreement and the Consolidation Agreement.

Date, Time, and Place of Special Meeting

    The date, time and place of the special meeting are as follows:

               Wednesday, February 24, 1999
               1:30 p.m., local time
               Mercantile Bank, National Association
               835 East Levee Street
               Brownsville, Texas  78520

                                       21
<PAGE>
 
    Bank shareholders are requested to promptly sign, date, and return the
accompanying proxy card in the enclosed postage-paid and pre-addressed envelope.
Failure to return a properly executed proxy card or to vote at the meeting will
have the same effect as a vote against approval of the Reorganization Agreement
and the Consolidation Agreement.

Matters to be Considered at the Special Meeting

    The purposes of the special meeting are (a) to consider and vote upon the
approval of the Reorganization Agreement and the Consolidation Agreement, and
(b) to transact such other business as may properly come before the special
meeting or any adjournments or postponements thereof.

    For the reasons set forth herein, the Bank's board of directors has, by
unanimous vote, approved the Reorganization Agreement and the Consolidation
Agreement and recommends a vote "FOR" approval of the Reorganization Agreement
and the Consolidation Agreement.

Record Date

    The Bank has established January 15, 1999 as the record date for the meeting
(the "Bank record date"). Only shareholders of record on that date are entitled
to attend and vote at the special meeting.

Voting Rights; Votes Required for Approval

    On the Bank record date, there were 2,739,928 shares of Bank common stock
outstanding and entitled to vote at the special meeting. The holders of Bank
common stock are entitled to one vote per share. The presence, in person or by
proxy, at the special meeting of the holders of a majority of the outstanding
shares is necessary for a quorum. Approval of the Consolidation requires the
affirmative vote, in person or by proxy, of the holders of at least two-thirds
of the outstanding shares of Bank common stock on the Bank record date.

Voting and Revocation of Proxies

    Shares represented by proxies properly executed and received in time to be
voted at the special meeting will be voted in accordance with the instructions
indicated on the proxies. Proxies which do not contain voting instructions will
be voted "FOR" the proposal to approve the Reorganization Agreement and the
Consolidation Agreement. All proxies voted "FOR" such matters, including proxies
on which no instructions are indicated, may, at the discretion of the proxy
holder, be voted "FOR" a motion to adjourn or postpone the special meeting to
another time and/or place for the purpose of soliciting additional proxies or
otherwise; provided however, that no proxy which is voted against approval of
the Reorganization Agreement and the Consolidation Agreement or on which the
relevant shareholder specifically abstains from voting with respect to such
approval will be voted in favor of any such adjournment or postponement.

    You may revoke your proxy at any time before it is voted by (a) filing
either an instrument revoking the proxy or a duly executed proxy bearing a later
date with the corporate secretary of the Bank before or at the special meeting,
or (b) voting the shares subject to the proxy in person at the special meeting.
Attendance at the special meeting will not by itself result in your proxy being
revoked.

                                       22
<PAGE>
 
    It is not expected that any matters other than as described herein will be
brought before the special meeting. If, however, other matters are properly
brought before the special meeting, persons appointed as proxies will have
discretion to vote or act thereon in their best judgment.

Solicitation of Proxies

    In addition to solicitation by mail, directors, officers and employees of
the Bank may solicit proxies from Bank shareholders personally or by telephone
or other means without additional remuneration therefor. The Bank will also
provide persons, trusts, firms, banks, and corporations holding shares in their
names or in the names of nominees, which in any case are beneficially owned by
others, with proxy materials for transmittal to such beneficial owners and will
reimburse such record owners for their expenses in doing so. The Bank will bear
the cost of solicitation of proxies from Bank shareholders.

Security Ownership of Certain Beneficial Owners and Management; Voting
Agreements

    As of the Bank Record Date, Mercantile and the directors and officers of the
Bank beneficially held, in the aggregate, the ability to direct the voting with
respect to 2,712,258 shares of Bank common stock, comprising approximately
99.02% of the voting power of Bank common stock outstanding on the Bank Record
Date. In addition, pursuant to a voting agreement between Wells Fargo and
Mercantile, Mercantile, which holds 2,629,371 shares, or approximately 96.0% of
the voting power of Bank common stock, has agreed to vote its shares in favor of
the Consolidation.


                                The Transactions

Background of and Reasons for the Transactions

    Merger activity among financial institutions has continued at a heightened
level during the past several years. From time to time during this period, the
Bank was approached informally by various parties to see if it would consider a
business combination. The board of directors of the Bank was interested in a
combination because it recognized that a stronger and bigger institution would
be more likely to possess the financial resources to compete more effectively in
the rapidly changing marketplace for banking and financial services in the
southern Texas area.

    In 1996, the Bank agreed to be acquired by Laredo National Bancshares, Inc.
However, the proposed combination failed to receive permission from the Federal
Reserve Board and Laredo National Bancshares, Inc. withdrew its application to
acquire the Bank in January of 1998.

    After the termination of the proposed combination with Laredo National
Bancshares, Inc., the board of directors of the Bank retained Alex Sheshunoff &
Co. Investment Banking ("Sheshunoff") to seek potential partners for a business
combination, and Sheshunoff approached a number of possible acquirors to assess
their level of interest in an acquisition. Wells Fargo (formerly Norwest
Corporation) expressed strong interest because it was looking to increase its
presence in the Rio Grande Valley, the Coastal Bend, and northern Mexico. In the
Rio Grande Valley, Wells Fargo operates through its wholly-owned subsidiary,
First Valley Bank, which has 16 branches in four Texas counties.

   A number of conversations took place in August and September of 1998 between
the management of Wells Fargo and the management of both the Bank and Mercantile
as the principal shareholder of the Bank. As a result of these discussions,
which included a purchase price and other terms, Wells Fargo

                                       23
<PAGE>
 
commenced a due diligence investigation of the Bank and Mercantile, and the
parties began negotiating a definitive acquisition agreement, pursuant to which
Wells Fargo would acquire both Mercantile and the Bank. The Reorganization
Agreement was approved by the Bank's board of directors and the Mercantile board
of directors on October 19, 1998, and executed on October 28, 1998.

    In reaching its determination to enter into the Reorganization Agreement,
the boards of directors of the Bank and Mercantile consulted with its legal,
tax, and other advisors and considered a number of factors including, but not
limited to, the following:

        (i) the price to be received by Bank shareholders and the sole
    Mercantile shareholder, including how the price to be received related to
    prices received by other comparable banking organizations;

        (ii) the fairness opinion of Sheshunoff to the Bank's minority
    shareholders that the exchange ratio was fair, from a financial point of
    view, to the minority holders of Bank common stock;

        (iii) the increased investment liquidity that the receipt of Wells Fargo
    common stock would provide to Bank shareholders and the sole Mercantile
    shareholder;

        (iv) the fact that Wells Fargo is a diversified financial services
    company with banking operations in 21 states and nonbanking operations
    (including insurance, investment services, mortgages, and consumer finance)
    in all 50 states;

        (v) the ability to expand the portfolio of banking products and services
    offered to customers and the Brownsville community, thus enabling the Bank
    to better compete with other banks and financial institutions in the
    Brownsville and surrounding markets;

        (vi) the tax-free nature of the exchange of Bank common stock and
    Mercantile common stock for Wells Fargo common stock; and

        (vii) the opportunity for cost savings, operating efficiencies, and
    economies of scale.

Opinion of Financial Advisor

    General

    The Bank retained Sheshunoff to provide its opinion of the fairness of the
consideration to be received by the Bank's shareholders other than Mercantile in
connection with the Consolidation and related matters. As part of its investment
banking business, Sheshunoff is regularly engaged in the valuation of securities
in connection with mergers and acquisitions and valuations for estate, corporate
and other purposes. The Bank's board of directors decided to retain Sheshunoff
based on its experience as a financial advisor in mergers and acquisitions of
financial institutions, and its knowledge of financial institutions. On October
9, 1998, Sheshunoff rendered its written opinion that, as of such date, the
consideration was fair, from a financial point of view, to the holders of the 
Bank's common stock other than Mercantile.

    The full text of the Sheshunoff's opinion which sets forth, among other
things, assumptions made, procedures followed, matters considered, and
limitations on the review undertaken, is attached as Appendix C to this proxy
statement-prospectus. The Bank's shareholders are urged to read the

                                       24
<PAGE>
 
Sheshunoff opinion carefully and in its entirety. Sheshunoff's opinion is
addressed to the Bank's board of directors and is not a recommendation to any
shareholder of the Bank as to how such shareholder should vote at the special
meeting.

    In connection with its opinion, Sheshunoff: (i) reviewed the Reorganization
Agreement, including the Consolidation Agreement; (ii) reviewed certain publicly
available financial statements and other information of the Bank and Wells
Fargo, respectively; (iii) reviewed certain internal financial statements and
other financial and operating data of the Bank provided to Sheshunoff by its
management; (iv) reviewed the reported prices and share trading activity for
Wells Fargo; (v) discussed the past and current operations, financial condition,
and future prospects of the Bank with its executive management; (vi) compared
the Bank and Wells Fargo from a financial point of view with certain other
banking companies that Sheshunoff deemed to be relevant; (vii) compared the
financial performance of Wells Fargo and the prices and trading activity of
Wells Fargo common stock with that of certain other comparable publicly traded
companies and their securities; (viii) reviewed the financial terms, to the
extent publicly available, of certain comparable merger transactions nationally,
in the Southern United States, and in Texas, and; (ix) performed such other
analyses and reviews as Sheshunoff deemed appropriate.

    In connection with its review, Sheshunoff relied upon and assumed the
accuracy and completeness of all of the information listed above and provided to
it or made publicly available. Sheshunoff did not assume any responsibility for
independent verification of such information. With respect to internal
confidential financial projections, Sheshunoff assumed that such projections
were reasonably prepared on the basis that reflects the best currently available
estimates and judgments of the future financial performance of the Bank.
Sheshunoff did not independently verify the validity of such assumptions.
Sheshunoff also did not make any independent evaluation or appraisal of the
assets or liabilities of the Bank, nor was Sheshunoff furnished with any such
appraisals. Sheshunoff did not examine any individual loan files of the Bank.
Sheshunoff is not an expert in the evaluation of loan portfolios for the
purposes of assessing the adequacy of the allowance for losses with respect
thereto and has assumed that such allowances for each of the companies are in
the aggregate, adequate to cover such losses.

    With respect to Wells Fargo, Sheshunoff relied solely upon publicly
available data regarding Wells Fargo's financial condition and performance.
Sheshunoff did not meet with or discuss this publicly available information with
the management of Wells Fargo. Sheshunoff did not conduct any independent
evaluation or appraisal of the assets, liabilities or business prospects of
Wells Fargo, was not furnished with any evaluations or appraisals, and did not
review any individual credit files of Wells Fargo.

    Sheshunoff's opinion is necessarily based on economic, market, and other
conditions as in effect on, and the information made available to Sheshunoff as
of October 9, 1998, the date of its opinion.

    In connection with rendering its opinion, Sheshunoff performed a variety of
financial analyses. The preparation of a fairness opinion involves various
determinations as to the most appropriate and relevant methods of financial
analysis and the application of those methods to the particular circumstances .
As a result, such an opinion is not readily susceptible to partial analysis or
summary description. Moreover,

                                       25
<PAGE>
 
the evaluation of the fairness, from a financial point of view, of the
consideration to be received by the minority shareholders of the Bank is to some
extent a subjective one based on the experience and judgment of Sheshunoff and
not merely the result of mathematical analysis of financial data. Accordingly,
notwithstanding the separate factors summarized below, Sheshunoff believes that
its analyses must be considered as a whole and that selecting portions of its
analyses and of the factors considered by it, without considering all analyses
and factors, could create an incomplete view of the evaluation process
underlying its opinion. The ranges of valuations resulting from any particular
analysis described below should not be taken to be Sheshunoff's view of the
actual value of the Bank.

    In performing its analyses, Sheshunoff made numerous assumptions with
respect to industry performance, business and economic conditions and other
matters, many of which are beyond the control of the Bank. The analyses
performed by Sheshunoff are not necessarily indicative of actual values or
future results, which may be significantly more or less favorable than suggested
by such analyses. The analyses do not purport to be appraisals or to reflect the
prices at which a company might actually be sold. In addition, Sheshunoff's
analyses should not be viewed as determinative of the Bank's board of director's
or the Bank's management's opinion with respect to the value of the Bank.

    The following is a summary of the analyses performed by Sheshunoff in
connection with its opinion dated as of October 9, 1998. Where available, the
following discussion contains financial information updated to January 11, 1999:

    Analysis of Selected Transactions.

    Sheshunoff performed an analysis of premiums paid in selected pending or
recently completed acquisitions of banking organizations in Texas, in the
southern United States, and nationally, with comparable characteristics to the
Bank and Wells Fargo transaction. Three sets of comparable transactions were
analyzed to ensure a thorough comparison.

    The first set of comparable transactions (the "state transactions") was
comprised to reflect the asset size and regional location of the Bank. The
regional transactions specifically consisted of six (6) mergers and acquisitions
of banks with total assets above $250 million and located in Texas which sold
for common stock between June 1, 1997 and January 11, 1999. The analysis yielded
multiples of the regional transactions' purchase price relative to: (i) book
value ranging from 2.08 times to 4.65 times with an average of 2.99 times and a
median of 2.84 times (compared with the multiple implied in the Consolidation,
based on the closing price of Wells Fargo common stock at January 11, 1999, of
1.99 times September 30, 1998 book value); (ii) last 12 months earnings ranging
from 14.6 times to 28.2 times with an average of 20.3 times and a median of 19.2
times (compared with the multiple implied in the Consolidation, based on the
closing price of the Wells Fargo common stock at January 11, 1999, of 22.1 times
last 12 months earnings as of September 30, 1998); (iii) total assets ranging
between 21.9% and 29.4% with an average of 23.7% and a median of 22.8% (compared
with the multiple implied in the Consolidation, based on the closing price of
the Wells Fargo common stock at January 11, 1998, of 21.4% of September 30, 1998
total assets); and (iv) total deposits ranging from 23.9% to 34.6% with an
average of 26.6% and a median of 25.6% (compared with the multiple implied in
the Consolidation,

                                       26
<PAGE>
 
based on the closing price of the Wells Fargo common stock at January 11, 1999,
of 27.3% of deposits as of September 30, 1998).

    The second set of comparable transactions (the "southern transactions") was
comprised to reflect a broader defined group of comparable transactions based on
the asset size, location and type of consideration received. The southern
transactions specifically consisted of six (6) mergers and acquisitions of banks
in the southern United States with total assets between $500 million and $1
billion and located in the South which sold for common stock between January 1,
1998 and January 11, 1999. The analysis yielded multiples of the regional
transactions' purchase price relative to: (i) book value ranging from 2.08 times
to 4.65 times with an average of 3.08 times and a median of 2.82 times (compared
with the multiple implied in the Consolidation, based on the closing price of
Wells Fargo common stock at January 11, 1999, of 1.99 times September 30, 1998
book value); (ii) last 12 months earnings ranging from 16.6 times to 29.7 times
with an average of 24.1 times and a median of 26.6 times (compared with the
multiple implied in the Consolidation, based on the closing price of the Wells
Fargo common stock at January 11, 1999, of 22.1 times last 12 months earnings as
of September 30, 1998); (iii) total assets ranging between 20.2% and 29.8% with
an average of 26.1% and a median of 27.2% (compared with the multiple implied in
the Consolidation, based on the closing price of the Wells Fargo common stock at
January 11, 1998, of 21.4% of September 30, 1998 total assets); and (iv) total
deposits ranging from 23.2% to 36.8% with an average of 30.7% and a median of
31.2% (compared with the multiple implied in the Consolidation, based on the
closing price of the Wells Fargo common stock at January 11, 1999, of 27.3% of
deposits as of September 30, 1998).

    The third set of comparable transactions (the "national transactions") was
comprised to reflect a broader universe than exhibited by the southern
transactions. These national transactions specifically consisted of fifteen (15)
mergers and acquisitions of banks in the United States with total assets between
$500 million and $1 billion which sold for common stock between January 1, 1998
and January 11, 1999. The analysis yielded multiples of the regional
transactions' purchase price relative to: (i) book value ranging from 2.08 times
to 4.65 times with an average of 3.17 times and a median of 3.16 times (compared
with the multiple implied in the Consolidation, based on the closing price of
Wells Fargo common stock at January 11, 1999, of 1.99 times September 30, 1998
book value); (ii) last 12 months earnings ranging from 16.6 times to 37.6 times
with an average of 26.7 times and a median of 26.0 times (compared with the
multiple implied in the Consolidation, based on the closing price of the Wells
Fargo common stock at January 11, 1999, of 22.1 times last 12 months earnings as
of September 30, 1998); (iii) total assets ranging between 20.2% and 36.4% with
an average of 28.4% and a median of 29.4% (compared with the multiple implied in
the Consolidation, based on the closing price of the Wells Fargo common stock at
January 11, 1998, of 21.4% of September 30, 1998 total assets); and (iv) total
deposits ranging from 23.2% to 43.0% with an average of 33.0% and a median of
34.6% (compared with the multiple implied in the Consolidation, based on the
closing price of the Wells Fargo common stock at January 11, 1999, of 27.3% of
deposits as of September 30, 1998).

                                       27
<PAGE>
 
    Discounted Cash Flow Analysis.

    Using discounted cash flow analysis, Sheshunoff estimated the present value
of the future stream of after-tax cash flow that the Bank could produce through
the year 2003, under various circumstances, assuming that the Bank performed in
accordance with the earnings/return projections of management. Sheshunoff
estimated the terminal value for the Bank at the end of the period by applying
multiples of earnings ranging from 15 times to 20 times and then discounting the
cash flow streams, dividends paid to the shareholders (assuming all earnings in
excess of that required to maintain a tangible equity to tangible asset
percentage of 6.0% are paid out in dividends) and terminal value using discount
rates ranging from 12% to 14% chosen to reflect different assumptions regarding
the required rates of return of the Bank and the inherent risk surrounding the
underlying projections. This discounted cash flow analysis indicated a range of
$53 per share to $67 per share based on 2,739,928 fully diluted shares
outstanding. This compares favorably to the value of the consideration for the
Bank of $65.562 per share, based on the closing price per share of Wells Fargo
common stock at January 11, 1999.

    Sheshunoff also performed a cash flow analysis using an estimated terminal
value for the Bank at the end of the period by applying multiples of book value
ranging from 2.00 times to 3.00 times and then discounting the cash flow
streams, dividends paid to the shareholders (assuming all earnings in excess of
that required to maintain a tangible equity to tangible asset percentage of 6.0%
are paid out in dividends) and terminal value using discount rates ranging from
12% to 14% chosen to reflect different assumptions regarding the required rates
of return of the Bank and the inherent risk surrounding the underlying
projections. This discounted cash flow analysis indicated a range of $47 per
share to $64 per share. This compares favorably to the value of the
consideration for the Bank of $65.562 per share, based on the closing price per
share of Wells Fargo common stock at January 11, 1999.

    Sheshunoff stated that the discounted cash flow analysis is a widely-used
valuation methodology but noted that that it relies on numerous assumptions,
including asset and earnings growth rates, terminal values and discount rates.
The analysis did not purport to be indicative of the actual values or expected
values of the Bank common stock.

    Comparable Company Analysis.

    Sheshunoff compared selected balance sheet data, asset quality,
capitalization and profitability measures and market statistics using financial
data at or for the twelve months ended September 30, 1998 and market data as of
January 11, 1999 for Wells Fargo to a group of selected bank holding companies
which Sheshunoff deemed to be relevant.

    The group of selected bank holding companies (the "Comparable Composite")
included BankAmerica Corporation, Citigroup, Inc., Chase Manhattan Corporation,
First Union Corporation, J.P. Morgan & Company and Bank One Corporation Capital
City Bank Group, Inc., Hamilton Bancorp, Inc., Republic Banking Corporation of
Florida, and Republic Bancshares, Inc. This comparison, among other things,
showed that: (i) Wells Fargo's tangible equity to tangible asset percentage was
6.22%, compared to an average of 5.77% and a median of 5.59% for the Comparable
Composite; (ii) for the last

                                       28
<PAGE>
 
twelve months ended September 30, 1998, Wells Fargo's return on average equity
was 20.9%, compared to an average of 14.7% and a median of 15.9% for the
Comparable Composite; (iii) for the last twelve months ended September 30, 1998,
Wells Fargo's return on average assets was 1.66%, compared to an average of
1.01% and a median of 0.94% for the Comparable Composite; (iv) as of September
30, 1998, Wells Fargo's nonperforming loans to total loans ratio was 0.48%,
compared to an average of 0.73% and a median of 0.60% for the Comparable
Composite; (v) as of January 11, 1999, Wells Fargo's price per share to
September 30, 1998 book value per share was 4.03 times, compared to an average
of 2.94 times and median of 3.06 times for the Comparable Composite; and (vi) as
of January 11, 1999, Wells Fargo Corporation's price per share to projected 1999
earnings per share was 17.2 times, compared to an average of 15.5 times and
median of 15.0 times for the Comparable Composite.

    Sheshunoff also compared selected stock market results of Wells Fargo to the
publicly available corresponding data of other composites which Sheshunoff
deemed to be relevant, including SNL Securities, L.P.'s ("SNL") index of all
publicly traded banks, the aforementioned Comparable and the S&P 500.

    No company or transaction used in the comparable company and comparable
transaction analyses is identical to the Bank or the Consolidation. Accordingly,
an analysis of the results of the foregoing necessarily involves complex
considerations and judgments concerning differences in financial and operating
characteristics of the Bank and other factors that could affect the public
trading value of the companies to which they are being compared. Mathematical
analysis (such as determining the average or median) is not in itself a
meaningful method of using comparable transaction data or comparable company
data.

    Pursuant to an engagement letter dated February 12, 1998, between the Bank
and Sheshunoff, the Bank agreed to pay Sheshunoff a retainer fee of $10,000 and
a transaction fee based upon the consideration paid to the Bank. The Bank also
agreed to indemnify and hold harmless Sheshunoff and its officers and employees
against certain liabilities in connection with its services under the engagement
letter, except for liabilities resulting from the negligence of Sheshunoff.

Additional Interests of Bank Management in the Consolidation

    In considering the recommendation of the Bank's board of directors to
approve the Reorganization Agreement and the Consolidation Agreement, you should
be aware that the Bank's directors and executive officers have interests in the
Consolidation that are different from, or in addition to, the interests of Bank
shareholders generally. The Bank's board of directors was aware of these
interests when it approved the Consolidation.

        Employment Agreements. Ms. Graciela Gutierrez and Messrs. James S. Scott
    and Edward J. Bacak have entered into employment agreements with Wells
    Fargo, pursuant to which each of them will be employed by Wells Fargo for a
    one-year period following the effective date of the Consolidation. Ms.
    Gutierrez will receive base annual compensation of $180,000, Mr. Scott will
    receive base annual compensation of $170,000 and Mr. Bacak will receive base
    annual compensation of $100,000. Ms. Gutierrez and Messrs. Scott and Bacak
    will also be eligible for all benefits available to similarly-situated,
    regular, full-time employees of Wells Fargo and its affiliates (other

                                       29
<PAGE>
 
    than participation in Wells Fargo's severance plan). The employment
    agreement of Ms. Gutierrez and Messrs. Scott and Bacak contain economic
    incentives to refrain from competing with Wells Fargo for a period of one
    year after the terms of their respective employment agreements expire.
    Specifically, Ms. Gutierrez will receive a total of $180,000, payable in two
    semiannual installments, Mr. Scott will receive a total of $170,000 payable
    in two semi-annual installments, and Mr. Bacak will receive a total of
    $100,000, also payable in two semiannual installments.

Appraisal Rights

    Under federal law, any shareholder of Bank who dissents from the
Consolidation has the right to receive cash equal to the value of the
shareholder's shares as measured on the effective date of the Consolidation.
This right is subject to the following conditions: (a) the shareholder must vote
against approval of the Consolidation at the special meeting or give notice in
writing at or before the special meeting to the presiding officer that such
shareholder dissents from the proposed Consolidation; (b) the shareholder must,
within 30 days after the effective date of the Consolidation, make a written
request for payment to the surviving bank; (c) the written request must be
accompanied by surrender of the shareholder's stock certificate(s). Any
shareholder who votes against the Consolidation at the special meeting, or who
gives notice in writing at or before the special meeting to the presiding
officer that such shareholder dissents, will be notified in writing of the
effective date of the Consolidation. Failure to comply strictly with each of the
foregoing conditions will result in the loss of appraisal rights.

    The value of the shares of any dissenting shareholder will be determined by
an appraisal made by a committee of three persons, one to be selected by the
majority vote of the dissenting shareholders, one by the board of directors of
the surviving bank, and the third by the two so chosen. The valuation agreed
upon by any two of the three appraisers will govern. If the value so fixed is
not satisfactory to any dissenting shareholder, that shareholder may, within
five days after being notified of the appraised value of such shareholder's
shares, appeal to the OCC, who will cause a reappraisal to be made which will be
final and binding as to the value of such shares. If a shareholder dissents and,
within 90 days from the effective date of the Consolidation, one or more of the
appraisers is not selected for any reason, or the appraisers fail to determine
the value of such shares, the OCC will, upon written request of any interested
party, cause an appraisal to be made which will be final and binding on all
parties. The expenses of the OCC in making the reappraisal or the appraisal, as
the case may be, will be paid by the surviving bank.. The value of the shares
ascertained will be promptly paid to the dissenting shareholder by the surviving
bank.

    The foregoing is a summary of Title 12, Section 215 of the United States
Code. It is not a complete statement of the provisions of Section 215 and is
qualified in its entirety by reference to the relevant provisions of Section
215, the text of which is attached to this proxy statement-prospectus as
Appendix D. Any shareholder of the Bank who desires to exercise dissenters'
appraisal rights should carefully review and comply with the relevant provisions
of Section 215. APPRAISAL RIGHTS WILL BE FORFEITED IF THE PROCEDURAL
REQUIREMENTS OF SECTION 215 ARE NOT STRICTLY COMPLIED WITH.

    Attached to this proxy statement-prospectus as Appendix E is a copy of
Banking Circular 259 regarding the valuation methods used by the OCC to estimate
the value of a bank's shares when the OCC is involved in the appraisal of shares
held by dissenting shareholders. The results of appraisals performed by the OCC
between January 1, 1985 and September 30, 1991 are also summarized in Appendix
E. YOU SHOULD CONSIDER CAREFULLY THE INFORMATION IN BANKING CIRCULAR 259 BEFORE
DECIDING WHETHER TO EXERCISE YOUR APPRAISAL RIGHTS.

                                       30
<PAGE>
 
Exchange of Certificates

    After completion of the Transactions, Norwest Bank Minnesota, National
Association, acting as exchange agent for Wells Fargo, will mail to each holder
of record of shares of Mercantile common stock and Bank common stock a form of
letter of transmittal, together with instructions for the exchange of the
holder's Mercantile or Bank stock certificates for a certificate representing
Wells Fargo common stock.

          SHAREHOLDERS SHOULD NOT SEND IN THEIR CERTIFICATES UNTIL THEY
            RECEIVE THE LETTER OF TRANSMITTAL FORM AND INSTRUCTIONS.

    No dividend or other distribution declared on Wells Fargo common stock after
completion of the Transactions will be paid to the holder of any certificates
for shares of Mercantile common stock or Bank common stock until after the
certificates have been surrendered for exchange.

    When the exchange agent receives a surrendered certificate or certificates
from a shareholder, together with a properly completed letter of transmittal, it
will issue and mail to the shareholder a certificate representing the number of
shares of Wells Fargo common stock to which the shareholder is entitled, plus
the amount in cash of any remaining fractional share and any cash dividends that
are payable with respect to the shares of Wells Fargo common stock so issued. No
interest will be paid on the fractional share amount or amounts payable as
dividends or other distributions.

    A certificate for Wells Fargo common stock may be issued in a name other
than the name in which the surrendered certificate is registered if (a) the
certificate surrendered is properly endorsed and accompanied by all documents
required to transfer the shares to the new holder and (b) the person requesting
the issuance of the Wells Fargo common stock certificate either pays to the
exchange agent in advance any transfer and other taxes due or establishes to the
satisfaction of the exchange agent that such taxes have been paid or are not
due.

    The exchange agent will issue stock certificates for Wells Fargo common
stock in exchange for lost, stolen or destroyed certificates for Mercantile
common stock or Bank common stock upon receipt of a lost certificate affidavit
and a bond indemnifying Wells Fargo for any claim that may be made against Wells
Fargo as a result of the lost, stolen or destroyed certificates.

    After completion of the Transactions, no transfers will be permitted on
either the books of Mercantile or the Bank. If, after completion of the
Transactions, certificates for Mercantile common stock or Bank common stock are
presented for transfer to the exchange agent, they will be canceled and
exchanged for certificates representing Wells Fargo common stock.

    None of Wells Fargo, Mercantile, the Bank, the exchange agent, or any other
person will be liable to any former holder of Mercantile common stock or Bank
common stock for any amount delivered in good faith to a public official
pursuant to applicable abandoned property, escheat, or similar laws.

                                       31
<PAGE>
 
Regulatory Approvals

    The Transactions are subject to the prior approval of the Federal Reserve
Board. The approval of the Federal Reserve Board is required because Wells Fargo
is a bank holding company registered under the Bank Holding Company Act. Wells
Fargo filed an application with the Federal Reserve Board requesting approval of
the Transactions and the Federal Reserve Board approved the application on
January 27, 1999 The Consolidation of the Bank with Norwest Interim Bank
Mercantile is subject to the approval of the OCC, because transactions like the
Consolidation, which involve national banks like the Bank, must be approved by
the OCC, the primary regulator of national banks. An application for approval of
the Consolidation was filed with the OCC on January 8, 1999. The OCC's approval
has not yet been received.

    Because the Transactions will result in the acquisition by Wells Fargo of
the Bank, Wells Fargo must give notice of the Transactions to the Texas Division
of Banking.

    The approval of an application means only that the regulatory criteria for
approval have been satisfied or waived. It does not mean that the approving
authority has determined that the consideration to be received by the sole
shareholder of Mercantile and the Bank shareholders is fair. Regulatory approval
does not constitute an endorsement or recommendation of the Transactions.

    Wells Fargo, Mercantile, and the Bank are not aware of any governmental
approvals or compliance with banking laws and regulations that are required for
the Transactions to become effective other than those described above. Wells
Fargo, Mercantile, and the Bank intend to seek any other approval and to take
any other action that may be required to effect the Transactions. There can be
no assurance that any required approval or action can be obtained or taken prior
to the effective date of the consent of the sole Mercantile shareholder or the
special meeting.

    The Transactions cannot be completed unless all necessary regulatory
approvals are granted. In addition, Wells Fargo may elect not to complete the
Transactions if any condition under which any regulatory approval is granted is
unreasonably burdensome to Wells Fargo. See "The Reorganization
Agreement-Conditions to the Completion of the Transactions" and "-Termination of
the Reorganization Agreement."

Effect on the Bank's Employee Benefit Plans

    The Reorganization Agreement provides that, subject to any eligibility
requirements applicable to such plans, employees of the Bank will be entitled to
participate in those Wells Fargo employee benefit and welfare plans specified in
the Reorganization Agreement. Eligible employees of the Bank will enter each of
such plans no later than the first day of the calendar quarter which begins at
least 32 days after completion of the Consolidation.

Material U.S. Federal Income Tax Consequences of the Transactions

    THE FEDERAL INCOME TAX DISCUSSION SET FORTH BELOW IS INCLUDED HEREIN FOR
GENERAL INFORMATION ONLY. THE SOLE SHAREHOLDER OF MERCANTILE AND THE
SHAREHOLDERS OF THE BANK ARE URGED TO CONSULT WITH THEIR OWN TAX ADVISORS TO
DETERMINE THE PARTICULAR TAX CONSEQUENCES TO THEM OF THE MERGER AND
CONSOLIDATION, INCLUDING THE APPLICATION AND EFFECT OF STATE, LOCAL AND FOREIGN
INCOME OR OTHER TAX LAWS.

                                       32
<PAGE>
 
    Set forth below is a summary of the opinion to be provided by Kilpatrick
Stockton LLP concerning the material federal income tax consequences to the sole
holder of Mercantile common stock who disposes of its Mercantile common stock in
the Merger and the shareholders of Bank common stock who dispose of their Bank
common stock in the Consolidation. This discussion is primarily based on the
Internal Revenue Code of 1986, as amended (the "Code"), and the Treasury
Regulations promulgated thereunder.

    Material Federal Income Tax Aspects of the Merger

    The following discussion is limited to the material federal income tax
aspects of the Merger to a holder of Mercantile common stock who is a citizen or
resident of the United States and who, on the date of disposition of his shares
of Mercantile common stock, holds such shares as a capital asset. This
discussion does not purport to deal with all aspects of taxation that may be
relevant to particular investors in light of their personal investment
circumstances, or to certain types of investors, including insurance companies,
tax-exempt organizations, financial institutions, broker-dealers, "S"
corporations, limited liability corporations, foreign corporations and tax
payers subject to alternative minimum tax . Further, this discussion does not
consider the state, local, or foreign tax consequences of the Merger to a holder
of Mercantile common stock.

    Mercantile has been advised by its special tax counsel, Kilpatrick Stockton
LLP, that based on the Code, judicial decisions, and certain factual
assumptions, the Merger will qualify as a "reorganization" within the meaning of
Sections 368(a)(1)(A) and 368(a)(2)(E) of the Code. The following is a summary
of the federal income tax consequences set forth in the form of legal opinion to
be delivered by Kilpatrick Stockton LLP, a copy of which is included as an
exhibit to the registration statement filed by Wells Fargo. In rendering this
opinion, Kilpatrick Stockton LLP has assumed, among other matters, that no
shareholder of Mercantile receiving Wells Fargo common stock in the Merger has
the intention, at the time of the Merger, of disposing of any Wells Fargo common
stock received or requesting registration of any shares except as permitted
under the Reorganization Agreement or the agreement executed by the affiliates
of Mercantile in favor of Wells Fargo.

    The Merger will qualify for federal income tax purposes as a
"Reorganization" within the meaning of Sections 368(a)(1)(A) and 368(a)(2)(E) of
the Code, and, as such, will result in the following federal income tax
consequences to the sole shareholder of Mercantile common stock:

        1. No gain or loss will be realized by the sole shareholder of
    Mercantile common stock to the extent it exchanges its shares of Mercantile
    common stock for shares of Wells Fargo common stock pursuant to the terms of
    the Merger.

        2. The aggregate basis of Wells Fargo common stock received by the sole
    Mercantile shareholder in the Merger will be the same as the aggregate basis
    of the Mercantile common stock surrendered and exchanged therefor, decreased
    by the amount of cash received and increased by the amount of gain realized
    by the such sole Mercantile shareholder under the exchange.

        3. The holding period of Wells Fargo common stock received by the sole
    Mercantile shareholder will include the period during which Mercantile
    common stock surrendered therefor was held, provided the Mercantile common
    stock is a capital asset in the hands of the sole Mercantile shareholder on
    the date of the exchange. The payment of cash in lieu of fractional shares
    of Wells

                                       33
<PAGE>
 
    Fargo common stock will be treated as a sale or exchange of such fractional
    shares potentially eligible for capital gains treatment.

        4. Dissenting shareholders whose shares of Mercantile common stock are
    disposed of pursuant to the exercise of appraisal rights will realize gain
    or loss equal to the difference between the amount of cash received from the
    exercise of such dissenters rights and such dissenting shareholder's
    aggregate adjusted tax basis in the stock exchanged.

        5. Unless an exemption applies, under the backup withholding rules of
    Section 3406 of the Code, an exchange agent shall be required to withhold,
    and will withhold, 31% of all cash payments to which the sole Mercantile
    shareholder is entitled pursuant to the Merger (unless such sole Mercantile
    shareholder provides its taxpayer identification number-social security
    number in the case of an individual, or Employer Identification Number in
    other cases) and certifies that such number is correct.

    Neither the foregoing discussion nor the opinion of Kilpatrick Stockton LLP
to Mercantile is binding on the Internal Revenue Service ("IRS") or the courts.
AS SUCH, THE FOREGOING PRESENTS ONLY A GENERAL DESCRIPTION OF THE FEDERAL INCOME
TAX CONSEQUENCES TO HOLDERS OF Mercantile COMMON STOCK OF THE TRANSACTIONS
CONTEMPLATED BY THE MERGER. ACCORDINGLY, THE SOLE MERCANTILE SHAREHOLDER IS
URGED TO CONSULT ITS OWN TAX ADVISOR WITH RESPECT TO ALL TAX CONSEQUENCES
STEMMING FROM THE MERGER THAT MAY AFFECT THE SOLE SHAREHOLDER.

    Material Federal Income Tax Aspects of the Consolidation

    The following discussion is limited to the material federal income tax
aspects of the Consolidation to a holder of Bank common stock who is a citizen
or resident of the United States and who, on the date of disposition of his
shares of Bank common stock, holds such shares as a capital asset. This
discussion does not purport to deal with all aspects of taxation that may be
relevant to particular investors in light of their personal investment
circumstances, or to certain types of investors, including insurance companies,
tax-exempt organizations, financial institutions, broker-dealers, "S"
corporations, limited liability corporations, foreign corporations and tax
payers subject to alternative minimum tax . Further, this discussion does not
consider the state, local, or foreign tax consequences of the Consolidation to a
holder of Bank common stock.

    The Bank has been advised by its special counsel, Kilpatrick Stockton LLP,
that based on the Code, judicial decisions, and certain factual assumptions, the
Consolidation will qualify as a "reorganization" within the meaning of Section
368(a)(1)(B) of the Code. The following is a summary of the federal income tax
consequences set forth in the form of legal opinion to be delivered by
Kilpatrick Stockton LLP, a copy of which is included as an exhibit to the
registration statement filed by Wells Fargo. In rendering this opinion,
Kilpatrick Stockton LLP has assumed, among other matters, that no shareholder of
the Bank receiving Wells Fargo common stock in the Consolidation has the
intention, at the time of the Consolidation, of disposing of any Wells Fargo
common stock received or requesting registration of any shares except as
permitted under the Reorganization Agreement or the agreement executed by the
affiliates of the Bank in favor of Wells Fargo.

    The Consolidation will qualify for federal income tax purposes as a
"Reorganization" within the meaning of Section 368(a)(1)(B) of the Code, and, as
such, will result in the following federal income tax consequences to holders of
Bank common stock:

                                       34
<PAGE>
 
        1. No gain or loss will be realized by holders of Bank common stock to
    the extent they exchange their shares of Bank common stock for shares of
    Wells Fargo common stock pursuant to the terms of the Consolidation.

        2. The aggregate basis of Wells Fargo common stock received by each Bank
    shareholder in the Consolidation will be the same as the aggregate basis of
    the Bank common stock surrendered and exchanged therefor, decreased by the
    amount of cash received and increased by the amount of gain realized by the
    shareholder under the exchange.

        3. The holding period of Wells Fargo common stock received by each Bank
    shareholder will include the period during which Bank common stock
    surrendered therefor was held, provided the Bank common stock is a capital
    asset in the hands of the Bank shareholder on the date of the exchange. The
    payment of cash in lieu of fractional shares of Wells Fargo common stock
    will be treated as a sale or exchange of such fractional shares potentially
    eligible for capital gains treatment.

        4. Dissenting shareholders whose shares of Bank common stock are
    disposed of pursuant to the exercise of appraisal rights will realize gain
    or loss equal to the difference between the amount of cash received from the
    exercise of such dissenters rights and such dissenting shareholder's
    aggregate adjusted tax basis in the stock exchanged.

        5. Unless an exemption applies, under the backup withholding rules of
    Section 3406 of the Code, an exchange agent shall be required to withhold,
    and will withhold, 31% of all cash payments to which a Bank shareholder is
    entitled pursuant to the Consolidation (unless such shareholder provides his
    taxpayer identification number-social security number in the case of an
    individual, or Employer Identification Number in other cases) and certifies
    that such number is correct.

    Neither the foregoing discussion nor the opinion of Kilpatrick Stockton LLP
to Bank is binding on the Internal Revenue Service ("IRS") or the courts. AS
SUCH, THE FOREGOING PRESENTS ONLY A GENERAL DESCRIPTION OF THE FEDERAL INCOME
TAX CONSEQUENCES TO HOLDERS OF BANK COMMON STOCK OF THE TRANSACTIONS
CONTEMPLATED BY THE CONSOLIDATION. ACCORDINGLY, EACH SHAREHOLDER IS URGED TO
CONSULT HIS OWN TAX ADVISOR WITH RESPECT TO ALL TAX CONSEQUENCES STEMMING FROM
THE CONSOLIDATION THAT MAY AFFECT HIM OR HER.

Resale of Wells Fargo Common Stock

    The Wells Fargo common stock issued in the Merger will be freely
transferable under the Securities Act, except for shares issued to Mercantile's
sole shareholder and those shareholders of the Bank who are considered to be
"affiliates" of Mercantile, the Bank, or Wells Fargo under Rule 145 under the
Securities Act or of Wells Fargo under Rule 144 under the Securities Act. The
definition of "affiliate" is complex and depends on the specific facts, but
generally includes directors, executive officers, 10% stockholders, and other
persons with the power to direct the management and policies of the company in
question.

    Affiliates of Mercantile and the Bank may not sell the shares of Wells Fargo
common stock received in the Transactions except (a) pursuant to an effective
registration statement under the Securities Act, (b) in compliance with an
exemption from the registration requirements of the Securities Act, or (c) in
compliance with Rule 144 and Rule 145 under the Securities Act. Generally, those
rules permit resales

                                       35
<PAGE>
 
of stock received by affiliates so long as Wells Fargo has complied with certain
reporting requirements and the selling stockholder complies with certain volume
and manner of sale restrictions. In addition, because the Transactions will be
accounted for as a "pooling of interests," affiliates of Mercantile and the Bank
may not sell or otherwise reduce their economic interest in Wells Fargo common
stock after the Transactions are completed until Wells Fargo has published
financial results which include at least 30 days of combined financial results
of Wells Fargo, Mercantile, and the Bank.

    Mercantile and the Bank have agreed to use their best efforts to deliver to
Wells Fargo signed representations by each person who may be deemed to be an
affiliate of Mercantile and the Bank that the person will not sell, transfer or
otherwise dispose of the shares of Wells Fargo common stock to be received by
the person in the Transactions except in compliance with the applicable
provisions of the Securities Act and the rules and regulations promulgated under
pooling of interests rules.

    This proxy statement-prospectus does not cover any resales of Wells Fargo
common stock received by affiliates of Mercantile.

Stock Exchange Listing

    The shares of Wells Fargo common stock to be issued in the Transactions will
be listed on the New York Stock Exchange and the Chicago Stock Exchange.

Accounting Treatment

    Wells Fargo will account for the Transactions as a pooling of interests,
assuming all of the criteria for a pooling transaction are satisfied. Under the
pooling of interests accounting method, Wells Fargo will carry forward the
assets and liabilities of Mercantile and the Bank at their historical recorded
values. Because the Transactions are not material to the consolidated financial
statements of Wells Fargo, Wells Fargo will not restate its balance sheet
amounts and results of operations for prior periods to reflect the combination
of Mercantile and the Bank with Wells Fargo.

    The unaudited pro forma data included in this proxy statement-prospectus for
the Transactions have been prepared using the pooling of interests method of
accounting. See "Summary-Comparative Per Common Share Data."

                          THE REORGANIZATION AGREEMENT


    The following is a summary of certain provisions of the Reorganization
Agreement which includes the Merger Agreement as Exhibit A-1 and the
Consolidation Agreement as Exhibit A-2 attached to this proxy
statement-prospectus as Appendix A. A copy of the Consolidation Agreement is
also attached to this proxy statement-prospectus as Appendix B. The
Reorganization Agreement is incorporated by reference into this proxy
statement-prospectus.

    This summary is qualified in its entirety by reference to the full text of
the Reorganization Agreement. Bank shareholders are encouraged to read the
Reorganization Agreement carefully and in its entirety. Parenthetical references
are to the relevant paragraph or paragraphs of the Reorganization Agreement.

                                       36
<PAGE>
 
    Bank shareholders should also refer to the "Glossary of Important Terms"
beginning on page __ of this document for the definitions of certain capitalized
terms used in this summary.

Basic Plan of Reorganization

    Structure and Consideration.

    The Merger and the Merger Consideration. Under the Reorganization Agreement,
a wholly-owned subsidiary of Wells Fargo, will merge into Mercantile, with
Mercantile as the surviving corporation. In the Merger, each outstanding share
of Mercantile common stock outstanding at the Effective Time of the Merger, will
be exchanged for a number of shares of Wells Fargo common stock computed as
follows (paragraph 1(a)(i)):

        (A) If the Wells Fargo Measurement Price is equal to or less than
    $37.00, the number of shares of Wells Fargo common stock will be determined
    by (i) dividing the Merger Value by $37.00, and (ii) dividing the result by
    the total number of outstanding shares of Mercantile common stock.

        (B) If the Wells Fargo Measurement Price is between $37.00 and $41.00,
    the number of shares of Wells Fargo common stock will be determined by (i)
    dividing the Merger Value by the Wells Fargo Measurement Price, and (ii)
    dividing the result thereof by the total number of outstanding shares of
    Mercantile common stock.

        (C) If the Wells Fargo Measurement Price is equal to or greater than
    $41.00, the number of shares of Wells Fargo common stock will be determined
    by (i) dividing the Merger Value by $41.00, and (ii) dividing the result
    thereof by the total number of outstanding shares of Mercantile common
    stock.

    The Consolidation and the Consolidation Consideration. Following the
Effective Time of the Merger, Wells Fargo will contribute Norwest Interim Bank
Mercantile to Mercantile and, immediately thereafter, Norwest Interim Bank
Mercantile will consolidate with the Bank under the charter of the Bank pursuant
to the Consolidation Agreement. In the Consolidation, each share of the Bank
common stock outstanding immediately prior to the Effective Time of the
Consolidation (other than shares owned by Mercantile and other than shares as to
which statutory dissenters' appraisal rights have been exercised) will be
converted into and exchanged for a number of shares of Wells Fargo common stock
determined as follows:

        (A) If the Wells Fargo Measurement Price (as defined below) is equal to
    or less than $37.00, the number of shares of Wells Fargo common stock will
    be determined by (i) dividing the Bank Consolidation Value (defined below)
    by $37.00, and (ii) dividing the result thereof by the total number of
    shares of Bank common Stock then outstanding held by shareholders of the
    Bank other than Mercantile.

        (B) If the Wells Fargo Measurement Price is between $37.00 and $41.00,
    the number of shares of Wells Fargo common stock will be determined by (i)
    dividing the Bank Consolidation Value by the Wells Fargo Measurement Price,
    and (ii) dividing the result thereof by the total number of shares of Bank
    common sock then outstanding held by shareholders of the Bank other than
    Mercantile.

                                       37
<PAGE>
 
        (C) If the Wells Fargo Measurement Price is equal to or greater than
    $41.00, the number of shares of Wells Fargo common stock will be determined
    by (i) dividing the Bank Consolidation Value by $41.00, and (ii) dividing
    the result thereof by the total number of shares of Bank common stock then
    outstanding held by shareholders of the Bank other than Mercantile.

    The price of Wells Fargo common stock on the Effective Date of the
Transactions may be higher or lower than the Wells Fargo Measurement Price. No
adjustment will be made to the number of shares of Wells Fargo common stock you
will receive to reflect fluctuations in the price of Wells Fargo common stock
occurring after the special meeting. However, Mercantile has the right to
terminate the Reorganization Agreement within five business days of the
effective date of the consent of Mercantile's sole shareholder approving the
Reorganization Agreement and the Merger, if the Wells Fargo Measurement Price is
less than $28.00 and less than a number obtained by a calculation based on an
index of stock prices of certain specified bank holding companies. This
termination right and the formula on which it is based is described in more
detail below under the heading "Termination of the Reorganization Agreement."

    Cash in Lieu of Fractional Shares. If the aggregate number of shares of
Wells Fargo common stock you will receive in the Transactions does not equal a
whole number, you will receive cash in lieu of the fractional share. The cash
payment will be equal to the product of the fractional part of the share of
Wells Fargo common stock multiplied by the Wells Fargo Measurement Price.
(paragraph 1(c))

    Completion of the Transactions. Wells Fargo, Mercantile, and the Bank expect
the Transactions to be completed promptly after approval of the Merger by the
sole Mercantile shareholder and approval of the Consolidation by the Bank
shareholders and the satisfaction (or waiver) of the other conditions to
completion contained in the Reorganization Agreement, including the receipt of
all required regulatory approvals. (paragraph 1(d))

Representations and Warranties

     The Reorganization Agreement contains various representations and
warranties by Wells Fargo, Mercantile, and the Bank as to, among other things,
(a) their organization and legal authority to engage in their respective
businesses, (b) their capitalization, (c) their corporate authority to enter
into the Reorganization Agreement and complete the Transactions, (d) the absence
of certain material changes, (e) compliance with laws, (f) material contracts,
(g) absence of certain litigation, and (h) undisclosed liabilities. (paragraphs
2 and 3) Because the representations and warranties do not survive completion of
the Transactions, they function primarily as a due diligence device and a
closing condition (that is, they must continue to be true in all material
respects until the Transactions are completed).

Certain Covenants

    The Reorganization Agreement has a number of covenants and agreements that
govern the actions of Wells Fargo, Mercantile, and the Bank pending completion
of the Transactions. Some of the covenants and agreements are summarized below.

    Conduct of Business.

    Mercantile and the Bank. Under the Reorganization Agreement, Mercantile and
the Bank are each required to maintain its corporate existence in good standing,
maintain the general character of its business, conduct its business in the
ordinary and usual manner, and extend credit in accordance with

                                       38
<PAGE>
 
existing lending policies. Subject to certain exceptions, Mercantile and the
Bank are each required to obtain the consent of Wells Fargo before it makes any
new loan or modifies, restructures or renews any existing loan if the amount of
the resulting loan, when combined with all other loans to the customer, would
exceed $1,000,000. The Reorganization Agreement places restrictions on the
ability of Mercantile and the Bank to take certain actions without Wells Fargo's
consent, including (a) incurring indebtedness, (b) granting rights to acquire
shares of its capital stock, (c) declaring dividends or purchasing its capital
stock, (d) selling its assets, and (e) raising the compensation of its officers
and directors. (paragraphs 4(a) and (b)) Some of these restrictions apply only
if the amount in question exceeds a threshold dollar value.

    Wells Fargo. Wells Fargo has agreed to conduct its business and to cause its
significant subsidiaries to conduct their respective businesses in compliance
with all material obligations and duties imposed by laws, regulations, rules and
ordinances or by judicial orders, judgments and decrees applicable to them or to
their businesses or properties.

    Competing Transactions. Neither Mercantile nor the Bank nor any director,
officer, representative, or agent of either may, directly or indirectly,
solicit, authorize the solicitation of, or enter into any discussions with, any
third party concerning any offer or possible offer to (a) purchase its common
stock, any security convertible into its common stock, or any other equity
security of Mercantile or the Bank, (b) make a tender or exchange offer for any
shares of its common stock or other equity security of Mercantile or the Bank,
(c) purchase, lease or otherwise acquire the assets of Mercantile or the Bank
except in the ordinary course of business, or (d) merge, consolidate, or
otherwise combine with Mercantile or the Bank. Mercantile and the Bank have also
agreed to promptly inform Wells Fargo if any third party makes an offer or
inquiry concerning any of the foregoing. (paragraph 4(h))

    Other Covenants. The Reorganization Agreement contains various other
covenants, including covenants relating to the preparation and distribution of
this proxy statement-prospectus, access to information, and the listing on the
New York Stock Exchange and Chicago Stock Exchange of the shares of Wells Fargo
common stock to be issued in the Transactions. In addition, Mercantile and the
Bank have agreed to (a) establish such additional accruals and reserves as are
necessary to conform its accounting and credit loss reserve practices and
methods to those of Wells Fargo and Wells Fargo's plans with respect to the
conduct of Mercantile's and the Bank's business after the Transactions, and (b)
use their best efforts to deliver to Wells Fargo prior to completion of the
Transactions signed representations substantially in the form attached as
Exhibit B to the Reorganization Agreement from each executive officer, director
or shareholder of Mercantile and the Bank who may reasonably be deemed an
"affiliate" of Mercantile and the Bank within the meaning of each term used in
Rule 145 of the Securities Act. (paragraphs 4(l) and 4(m)) and Exhibit B) See
"The Transactions-Resale of Wells Fargo Common Stock."

Conditions to the Completion of the Transactions

    Under the Reorganization Agreement, various conditions are required to be
met before the parties are obligated to complete the Transactions. These
conditions are customary and include such items as the receipt of shareholder,
regulatory and listing approval, and the receipt by Mercantile and the Bank of a
favorable tax opinion. (paragraphs 6 and 7) See "The Transactions-Material U.S.
Federal Income Tax Consequences of the Transactions."

                                       39
<PAGE>
 
    The obligations of the parties are also subject to the continued accuracy of
the other party's representations and warranties, the performance by the other
party of its obligations under the Reorganization Agreement, and, subject to
certain exceptions, the absence of any changes that have had or might be
reasonably expected to have an adverse effect on Mercantile and the Bank. Some
of the conditions to the Transactions are subject to exceptions and/or a
"materiality" standard. Certain conditions to the Transactions may be waived by
the party seeking to assert the condition. (paragraphs 6 and 7)


Termination of the Reorganization Agreement

    Termination by Mutual Consent. Wells Fargo and Mercantile can agree to
terminate the Reorganization Agreement at any time before completion of the
Transactions. (paragraph 9(a)(i))

    Termination by Either Wells Fargo or Mercantile. Either Wells Fargo or
Mercantile can terminate the Reorganization Agreement if any of the following
occurs:

    *   The Merger has not been completed by April 30, 1999 (provided this right
        to terminate will not be available to a party whose failure to perform
        in all material respects any obligation under the Reorganization
        Agreement resulted in the failure of the Merger to occur on or before
        that date). (paragraph 9(a)(ii))

    *   A court or governmental authority of competent jurisdiction has issued a
        final order restraining, enjoining or otherwise prohibiting the
        transactions contemplated by the Reorganization Agreement. (paragraph
        9(a)(iii))

    Termination by Mercantile. Mercantile may also terminate the Reorganization
Agreement at any time within five days after the effective date of the sole
Mercantile shareholder consent but prior to the Effective Time, if the Wells
Fargo Measurement Price is less than $28.00 per share and the number obtained by
dividing the Wells Fargo Measurement Price by 36.1875 (the closing price of one
share of Wells Fargo common stock on October 27, 1998, the trading day that
immediately preceded the date of the Reorganization Agreement) is less than the
number obtained by (i) dividing the Final Index Price by the Initial Index
Price, and then (ii) subtracting a number equal to 15.0% of the number resulting
from that division.

    As used in the above paragraph, the terms "Final Index Price" and "Initial
Index Price" (and certain related terms) are defined below:

    Final Index Price. The sum of the following, calculated for each of the
companies in the Index Group: (i) the Final Price for each such company
multiplied by (ii) the Weighting Factor for each company.

                                       40
<PAGE>
 
    Index Group. The companies listed below, each of whom must meet the
following criteria:

    *   Such company's common stock must be publicly trade, and

    *   During the Index Measurement Period, with respect to that company

        -   No publicly-announced proposal to acquire such company may be
            pending.

        -   No proposal by such company to acquire another company in exchange
            for stock where, if the company to be acquired were to become a
            subsidiary of the acquiring company, the company to be acquired
            would be a "significant subsidiary" as defined in Rule 1-02 of the
            SEC's Regulation S-X has been publicly announced after October 27,
            1998 (the day before the date of the Reorganization Agreement.)

        -   No program to repurchase 5% or more of the outstanding shares of
            such company's common stock has been publicly announced after
            October 27, 1998.

The companies in the Index Group are: BB&T Corporation, BancOne Corporation,
BankBoston Corporation, Bank of New York Company, Inc., Bankers Trust
Corporation, Chase Manhattan Corporation, Citicorp, Comerica, Inc., Fifth Third
Bancorp, First Union Corporation, Fleet Financial Group, Inc., Huntington
Bancshares, KeyCorp, Mellon Bank Corporation, Mercantile Bancorp, National City
Corporation, BankAmerica Corporation, Northern Trust Corporation, PNC Financial
Corporation, Republic Financial Corporation, Republic New York Corporation,
SouthTrust Corporation, State Street Boston Corporation, Summit Bancorp,
Suntrust Banks, Inc., UnionBanCal Corporation, U.S. Bancorp, Wachovia
Corporation

    Index Measurement Period. The period of 20 trading days ending on the day
immediately preceding the effective date of the consent of Mercantile's sole
shareholder approving the Reorganization Agreement and the Merger.

    Final Price. For any company in the Index Group, the average of the daily
closing prices of a share of common stock for that company, as reported on the
consolidated transaction reporting system for the market or exchange on which
such common stock is principally traded, during the Index Measurement Period.

    Weighting Factor. For any company, the Company Market Capitalization for
such company divided by the Total Market Capitalization.

    Initial Index Price. The sum of the following, calculated for each of the
companies in the Index Group: (i) the closing price per share of common stock of
each such company on October 27, 1998 (the trading day immediately preceding the
date of the Reorganization Agreement) multiplied by (ii) the Weighting Factor
for each such company.


Effect of Termination

   Generally, if either party terminates the Reorganization Agreement, it
becomes void without any liability to either party other than for willful and
material breaches occurring before termination; however, the provisions of the
Reorganization Agreement governing confidential information and

                                       41
<PAGE>
 
expenses incurred in connection with the Transactions continue in effect after
termination of the Reorganization Agreement. (paragraph 9(b))

   If the Reorganization Agreement is terminated, the Consolidation will not
occur.

Waiver and Amendment

    Any of Wells Fargo, Mercantile, or the Bank may waive any inaccuracies in
the representations and warranties of the other party or compliance by the other
party with any of the covenants or conditions contained in the Reorganization
Agreement. (paragraph 16)

    Any of Wells Fargo, Mercantile, or the Bank can amend the Reorganization
Agreement at any time before the Transactions are completed; however, the
Reorganization Agreement prohibits them from amending the Reorganization
Agreement after the sole Mercantile shareholder or the Bank shareholders approve
the Transactions if the amendment would change in a manner adverse to these
shareholders the consideration to be received by the sole Mercantile shareholder
and the Bank shareholders in the Transactions. (paragraph 17)

Expenses

    Wells Fargo, Mercantile, and the Bank will each pay their own expenses in
connection with the Transactions, including fees and expenses of their
respective independent auditors and counsel. (paragraph 10)


                     COMPARISON OF RIGHTS OF HOLDERS OF BANK
                    COMMON STOCK AND WELLS FARGO COMMON STOCK

    The Bank currently is a national bank. The rights of Bank shareholders are
governed by the National Bank Act and the Bank's articles of association and
bylaws. Wells Fargo is incorporated under the laws of the state of Delaware. The
rights of Wells Fargo stockholders are governed by the Delaware General
Corporation Law ("DGCL") and Wells Fargo's certificate of incorporation and
bylaws. Upon completion of the Consolidation, Bank shareholders will become
stockholders of Wells Fargo. As a result, their rights will be governed by the
DGCL and Wells Fargo's governing documents.

    The following discussion compares certain rights of the holders of Bank
common stock to the rights of the holders of Wells Fargo common stock. You can
find additional information concerning the rights of Wells Fargo stockholders in
Wells Fargo's restated certificate of incorporation and bylaws, in Wells Fargo's
current report on Form 8-K filed October 13, 1997, containing a description of
Wells Fargo common stock, and in Wells Fargo's registration statement on Form
8-A dated October 21, 1998, containing a description of preferred stock purchase
rights attached to shares of common stock.

    To the extent that information in the current report on Form 8-K filed
October 13, 1997 is inconsistent with the information below, you should rely on
the information below, as it is as of a more recent date.

                                       42
<PAGE>
 
    Wells Fargo's restated certificate of incorporation and its bylaws, as well
as its current report on Form 8-K filed October 13, 1997 and its Form 8-A
registration statement dated October 21, 1998, have been included along with the
mailing of this proxy statement-prospectus. See "Where You Can Find More
Information."

Capital Stock

    Wells Fargo. Wells Fargo's restated certificate of incorporation currently
authorizes the issuance of 4,000,000,000 shares of Wells Fargo common stock, par
value $1-2/3 per share, 20,000,000 shares of preferred stock, without par value,
and 4,000,000 shares of preference stock, without par value. At December 31,
1998, there were 1,644,057,803 shares of Wells Fargo common stock outstanding,
6,535,362 shares of Wells Fargo preferred stock outstanding, and no shares of
Wells Fargo preference stock outstanding.

    The Bank. The Bank's amended and restated articles of association currently
authorize the issuance of 30,000,000 shares of common stock, $1.00 par value. At
January 15, 1999, there were 2,739,928 shares of Bank common stock outstanding.

Rights Plan

    Wells Fargo. Each share of Wells Fargo common stock (including shares that
will be issued in the Merger) has attached to it one preferred share purchase
right. Once exercisable, each right allows the holder to purchase a fractional
share of Wells Fargo's Series C Junior Participating Preferred Stock. A right,
by itself, does not confer on its holder any rights of a Wells Fargo
stockholder, including the right to vote or receive dividends, until the right
is exercised. The rights trade automatically with shares of Wells Fargo common
stock. The rights are designed to protect the interests of Wells Fargo and its
stockholders against coercive takeover tactics. The rights are intended to
encourage potential acquirors to negotiate on behalf of all stockholders the
terms of any proposed takeover. Although not their purpose, the rights may deter
takeover proposals.

    The Bank.  The Bank has no comparable rights plan.

Directors

    Wells Fargo. Wells Fargo's bylaws provide for a board of directors
consisting of not less than 10 nor more than 28 persons, each serving a term of
one year or until his or her earlier death, resignation or removal. The number
of directors of Wells Fargo is currently fixed at 24. Directors of Wells Fargo
may be removed with or without cause by the affirmative vote of the holders of a
majority of the shares of Wells Fargo capital stock entitled to vote thereon.
Vacancies on Wells Fargo's board of directors may be filled by majority vote of
the remaining directors or, in the event a vacancy is not so filled or if no
director remains, by the stockholders. Directors of Wells Fargo are elected by
plurality of the votes of shares of Wells Fargo capital stock entitled to vote
thereon present in person or by proxy at the meeting at which directors are
elected. Wells Fargo's restated certificate of incorporation does not currently
permit cumulative voting in the election of directors.

    The Bank. The Bank's bylaws provide for a board of directors of not less
than five nor more than 25 shareholders, each serving a term of one year or
until his or her earlier death, resignation or removal. The exact number of
directors is fixed and determined from time to time by resolution of a majority
of the board of directors or a majority of the shareholders. The number of
directors of the Bank is currently

                                       43
<PAGE>
 
fixed at 16. The directors of the Bank are elected by a majority of the votes of
shares of the Bank common stock, present in person or by proxy at the meeting at
which shareholders are elected. Shareholders of the Bank are entitled to
cumulate their votes in the election of directors. Directors of the Bank may be
removed by the OCC and by shareholders at a meeting called to remove him unless
the number of votes sufficient to elect him under cumulative voting is voted
against his removal. Vacancies on the Bank's board of directors may be filled by
the affirmative vote of the majority of the remaining directors or by
shareholders at a special meeting.

Amendment of Charter Document and Bylaws

    Wells Fargo. Wells Fargo's restated certificate of incorporation may be
amended only if the proposed amendment is approved by Wells Fargo's board of
directors and thereafter approved by a majority of the outstanding stock
entitled to vote thereon and by a majority of the outstanding stock of each
class entitled to vote thereon as a class. Wells Fargo's bylaws may be amended
by a majority of Wells Fargo's board of directors or by a majority of the
outstanding stock entitled to vote thereon. Shares of Wells Fargo preferred
stock and Wells Fargo preference stock currently authorized in Wells Fargo's
restated certificate of incorporation may be issued by Wells Fargo's board of
directors without amending Wells Fargo's restated certificate of incorporation
or otherwise obtaining the approval of Wells Fargo's stockholders.

    The Bank. The Bank's amended and restated articles of association may be
amended at any regular or special meeting of the shareholders by the affirmative
vote of the holders of a majority of the stock. The Bank's bylaws may be amended
at any regular or special meeting of the shareholders by majority approval, if
notice of such amendment is contained in the notice of the meeting.

Approval of Mergers and Asset Sales

    Wells Fargo. Except as described below, the affirmative vote of a majority
of the outstanding shares of Wells Fargo common stock entitled to vote thereon
is required to approve a Merger or merger involving Wells Fargo or the sale,
lease or exchange of all or substantially all of Wells Fargo's corporate assets.
No vote of the stockholders is required, however, in connection with a Merger in
which Wells Fargo is the surviving corporation and (a) the agreement of Merger
for the Merger does not amend in any respect Wells Fargo's restated certificate
of incorporation, (b) each share of capital stock outstanding immediately before
the Merger is to be an identical outstanding or treasury share of Wells Fargo
after the Merger and (c) the number of shares of capital stock to be issued in
the Merger (or to be issuable upon conversion of any convertible instruments to
be issued in the Merger) does not exceed 20% of the shares of Wells Fargo's
capital stock outstanding immediately before the Merger.

    The Bank. The affirmative vote or the written consent of two-thirds of the
outstanding shares of Bank common stock is required to approve a merger or
consolidation involving the Bank or the sale of all or substantially all of the
Bank's assets.

Preemptive Rights

    Wells Fargo. Neither Wells Fargo's restated certificate of incorporation nor
its bylaws grants preemptive rights to its stockholders.

    The Bank. The Bank's articles of association provide that in the event of an
increase in the number of shares of Bank common stock by the sale of additional
shares, each shareholder is entitled to subscribe

                                       44
<PAGE>
 
for such additional shares in proportion to the number of shares owned by him or
her at the time the increase is authorized by the shareholders.

Appraisal Rights

    Wells Fargo. Section 262 of the DGCL provides for stockholder appraisal
rights in connection with consolidations and mergers generally; however,
appraisal rights are not available to holders of any class or series of stock
that, at the record date fixed to determine stockholders entitled to receive
notice of and to vote at the meeting to act upon the agreement of consolidation
or merger, were either (a) listed on a national securities exchange or
designated as a national market system security on an interdealer quotation
system by the National Association of Securities Dealers, Inc. or (b) held of
record by more than 2,000 stockholders, so long as stockholders receive shares
of the surviving corporation or another corporation whose shares are so listed
or designated or held by more than 2,000 stockholders. Wells Fargo common stock
is listed on the New York Stock Exchange and the Chicago Stock Exchange and
currently held by more than 2,000 stockholders. As a result, assuming that the
other conditions described above are satisfied, holders of Wells Fargo common
stock will not have appraisal rights in connection with consolidations and
mergers involving Wells Fargo.

    The Bank. The National Bank Act provides shareholders with dissenters'
rights in connection with mergers and consolidations. For a specific discussion
of the appraisal rights available to shareholders of Bank, see "The
Transactions-Appraisal Rights."

Special Meetings

    Wells Fargo. Under the DGCL, special meetings of stockholders may be called
by the board of directors or by such persons as may be authorized in the
certificate of incorporation or bylaws. Wells Fargo's bylaws provide that a
special meeting of stockholders may be called only by the chairman of the board,
a vice chairman, the president or a majority of Wells Fargo's board of
directors. Holders of Wells Fargo common stock do not have the ability to call a
special meeting of stockholders.

    The Bank. The Bank's certificate of association and bylaws provide that
special meetings of shareholders may be called by the board of directors or by
one or more shareholders owning not less than 25% of the issued and outstanding
Bank common stock.

Directors' Duties

    Wells Fargo. The DGCL does not specifically enumerate directors' duties. In
addition, the DGCL does not contain any provision specifying what factors a
director must and may consider in determining a corporation's best interests.
However, judicial decisions in Delaware have established that, in performing
their duties, directors are bound to use that degree of care which ordinarily
prudent persons would use in similar circumstances.

    The Bank. Although the National Bank Act does not specifically enumerate
directors duties, judicial decisions concerning the issue have established that
in performing their duties, national bank directors are bound to use that degree
of care which ordinarily prudent persons would use in similar circumstances.

                                       45
<PAGE>
 
Action Without a Meeting

    Wells Fargo. As permitted by Section 228 of the DGCL and Wells Fargo's
restated certificate of incorporation, any action required or permitted to be
taken at a stockholders' meeting may be taken without a meeting pursuant to the
written consent of the holders of the number of shares that would have been
required to effect the action at an actual meeting of the stockholders.

    The Bank. The amended and restated articles of association of the Bank
provide that any action required or permitted to be taken at a shareholders'
meeting may be taken without a meeting pursuant to the written consent of the
holders of outstanding stock having not less than the minimum number of votes
that would be necessary to take such action at a shareholder meeting.

Limitation of Director Liability

    Wells Fargo. Wells Fargo's restated certificate of incorporation provides
that a director (including an officer who is also a director) of Wells Fargo
shall not be liable personally to Wells Fargo or its stockholders for monetary
damages for breach of fiduciary duty as a director, except for liability arising
out of (a) any breach of the director's duty of loyalty to Wells Fargo or its
stockholders, (b) acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (c) payment of a dividend
or approval of a stock repurchase in violation of Section 174 of the DGCL or (d)
any transaction from which the director derived an improper personal benefit.
This provision protects Wells Fargo's directors against personal liability for
monetary damages from breaches of their duty of care. It does not eliminate the
director's duty of care and has no effect on the availability of equitable
remedies, such as an injunction or rescission, based upon a director's breach of
his duty of care.

    The Bank. The Bank's amended and restated articles of association do not
eliminate or limit the liability of a director to the Bank or its shareholders
for monetary damages for breach of a director's fiduciary duty.

Indemnification of Officers and Directors

    Wells Fargo. Wells Fargo's restated certificate of incorporation provides
that Wells Fargo must indemnify, to the fullest extent authorized by the DGCL,
each person who was or is made a party to, is threatened to be made a party to,
or is involved in, any action, suit, or proceeding because he is or was a
director or officer of Wells Fargo (or was serving at the request of Wells Fargo
as a director, trustee, officer, employee, or agent of another entity) while
serving in such capacity against all expenses, liabilities, or loss incurred by
such person in connection therewith, provided that indemnification in connection
with a proceeding brought by such person will be permitted only if the
proceeding was authorized by Wells Fargo's board of directors. Wells Fargo's
restated certificate of incorporation also provides that Wells Fargo must pay
expenses incurred in defending the proceedings specified above in advance of
their final disposition, provided that if so required by the DGCL, such advance
payments for expenses incurred by a director or officer may be made only if he
undertakes to repay all amounts so advanced if it is ultimately determined that
the person receiving such payments is not entitled to be indemnified. Wells
Fargo's restated certificate of incorporation authorizes Wells Fargo to provide
similar indemnification to employees or agents of Wells Fargo.

                                       46
<PAGE>
 
    Pursuant to Wells Fargo's restated certificate of incorporation, Wells Fargo
may maintain insurance, at its expense, to protect itself and any directors,
officers, employees or agents of Wells Fargo or another entity against any
expense, liability or loss, regardless of whether Wells Fargo has the power or
obligation to indemnify that person against such expense, liability or loss
under the DGCL.

    The right to indemnification is not exclusive of any other right which any
person may have or acquire under any statute, provision of Wells Fargo's
restated certificate of incorporation or Wells Fargo bylaws, agreement, vote of
stockholders or disinterested directors or otherwise.

    The Bank. The Bank's amended and restated articles of association provide
that the Bank may indemnify any director, officer, employee or agent in a
proceeding if it is determined by a majority of the directors not involved in
the proceeding or by majority vote of a committee of the board of directors
designated to act in the matter that such person conducted himself in good faith
and reasonably believed that he was acting in the best interest of the Bank.

Dividends

    Wells Fargo. Delaware corporations may pay dividends out of surplus or, if
there is no surplus, out of net profits for the fiscal year in which declared
and for the preceding fiscal year. Section 170 of the DGCL also provides that
dividends may not be paid out of net profits if, after the payment of the
dividend, capital is less than the capital represented by the outstanding stock
of all classes having a preference upon the distribution of assets. Wells Fargo
is also subject to Federal Reserve Board policies regarding payment of
dividends, which generally limit dividends to operating earnings. See "Certain
Regulatory and Other Considerations Pertaining to Wells Fargo."

    The Bank. Under the National Bank Act, the prior approval of the OCC is
required if the total of all dividends declared by the Bank in any calendar year
exceeds the total of the Bank's net profits of that year combined with its
retained net profits of the preceding two years, less any required transfers to
surplus.

Corporate Governance Procedures; Nomination of Directors

    Wells Fargo. Wells Fargo's bylaws contain detailed advance notice and
informational procedures which must be complied with in order for a stockholder
to nominate a person to serve as a director. Wells Fargo's bylaws generally
require a stockholder to give notice of a proposed nominee in advance of the
stockholders meeting at which directors will be elected. In addition, Wells
Fargo's bylaws contain detailed advance notice and informational procedures
which must be followed in order for a Wells Fargo stockholder to propose an item
of business for consideration at a meeting of Wells Fargo stockholders.

    The Bank. The Bank's amended and restated articles of association provide
that nomination for election to the board of directors may be made by the board
of directors or by any shareholder of any outstanding class of capital stock of
the Bank entitled to vote for the election of directors.

                                       47
<PAGE>
 
                  INFORMATION ABOUT THE ENTITIES TO BE ACQUIRED

General

     Mercantile

     Mercantile is incorporated in Delaware and is a wholly owned subsidiary of
Hemisphere Financial Ltd., a privately held British Virgin Islands corporation.
Mercantile currently holds approximately 96.0% of the outstanding common stock
of the Bank, which constitutes substantially all of Mercantile's assets. Other
than holding the common stock of the Bank, Mercantile does not actively engage
in any other investment or business activities.

     Mercantile is headquartered at 835 East Levee Street, Brownsville, Texas
78520 (telephone: (956) 548-6248).

     The Bank

     The Bank is a national banking association and one of the largest
independently owned banks in South Texas providing continuous personal
commitment, financial strength and export services to the Rio Grande Valley, the
Coastal bend, and northern Mexico. The Bank currently operates a total of 12
offices in South Texas, of which two are located in Brownsville, seven are
located in Corpus Christi, one in Portland, one in Harlingen, and one in
Ingleside. At September 30, 1998, the Bank had approximately $841.2 million in
total assets and $658.7 million in total deposits.

     The Bank has earned a reputation as a strong, well managed institution. The
Bank's commitment to customer service and community banking provides it with a
strong base of loyal loan and deposit customers. The Bank's primary lending
focus is commercial and industrial, commercial real estate loans, residential
real estate loans and consumer loans. At September 30, 1998, total net loans
were $315.8 million or 37.6% of total deposits.

     The Bank's main office is located at 835 East Levee Street, Brownsville,
Texas 78520 (telephone: (956) 548-6248).

Legal Proceedings

     Neither Mercantile nor the Bank is aware of any pending or threatened legal
proceedings, which, upon resolution, would have a material adverse effect on
Mercantile's or the Bank's financial condition, results of operations, or cash
flows.

Market Price and Dividends

     There is no active trading market for the common stock of Mercantile. As of
January 15, 1999, there were 1,000 shares of Mercantile common stock
outstanding, all held by its sole shareholder, Hemisphere Financial Ltd.
Mercantile has never paid dividends on its common stock.

     There is no active trading market in the common stock of the Bank. As of
January 15, 1999, there were 2,739,928 shares of Bank common stock outstanding,
of which 2,629,377 shares were held by Mercantile and the remaining by
approximately 23 shareholders. The Bank paid dividends on its common stock of
$1.00 per share in 1996 and did not pay dividends on its common stock in 1997 or
for the nine month period ending September 30, 1998.

                                       48
<PAGE>
 
Voting Securities and Principal Shareholders of Mercantile and the Bank

     Mercantile

     All of the outstanding common stock of Mercantile is beneficially owned by
Olegario Vazquez Rana through Hemisphere Financial, Ltd.

     The Bank

     The following table lists the only shareholder known by the Bank to be the
beneficial owner of more than five percent of outstanding Bank common stock.

                                           Amount and Nature
                                             of Beneficial       Percent of 
              Name and Address                 Ownership        Common Stock
     ----------------------------------    -----------------    ------------
     Olegario Vazquez Rana                     2,629,377             96.0%
     Mercantile Financial Enterprises, Inc.
     835 East Levee Street
     Brownsville, Texas 78520

     The following table lists the ownership of shares of Bank common stock as
of the Bank record date by each director and executive officer of the Bank and
by all directors and executive officers as a group.

     Name of Beneficial Owner or           No. of Shares         % of
       No. of Persons in Group          Beneficially Owned    Common Stock
     ---------------------------        ------------------    ------------
     Mary Rose Cardenas                       1,000                 *
     David C. Garza                           1,000                 *
     Frank Parker, Jr.                        1,000                 *
     Neal O. Simmons                          1,000                 *
     Bill Wolfe                               1,219                 *
     Sam Pate                                 1,219                 *
     A. J. Moser                              5,853                 *
     Marvin Conner                            5,910                 *
     W. W. McManus                            5,910                 *
     C. Fount Ray                             5,910                 *
     David A. Gelfer                          5,910                 *
     James S. Scott                           9,390                 *
     Graciela Gutierrez                       9,390                 *
     Roselle Clegg                            9,390                 *
     Ruben Edelstein                          9,390                 *
     Tol Boswell                              9,390                 *
     All executive officers and
        directors as a group 
        (16) persons                         82,881              3.02%

    -----------------------------
    *  Immaterial percentage of ownership.

                                       49
<PAGE>
 
Year 2000 Compliance

     The Bank formally established its Year 2000 project in February, 1997 in an
effort to identify and measure the level of risk the Year 2000 problem would
pose on the bank's operational and financial systems. The Bank, through the
auspices of its technology committee, has activated its Year 2000 conversion
team which has begun the task of identifying date sensitive systems. The Year
2000 conversion team uses the Brintech Year 2000 Risk Assessment System to
assist in the orderly implementation of the Bank's Year 2000 program, which was
approved by the executive committee of the Bank board of directors in August,
1997. The Bank's board of directors, executive management and staff are
supporting all compliance efforts and have approved the necessary resources to
achieve compliance.

     The Bank's Year 2000 remediation program consists of a five-part approach
which include inventory, risk rating, communicating with third party vendors and
tracking vendor responses, developing a Year 2000 plan that ensures system
certification, guiding the development of contingency plans for each system, and
lowering our overall risk relative to the Year 2000 problem.

     The Bank has completed the first three phases of the Year 2000 remediation
program. The pending acquisition of the Bank by Wells Fargo has caused the Bank
to delay the process of achieving full compliance with regulatory requirements.
However, if the proposed Consolidation with Wells Fargo is consummated,
additional resources are expected to be directed to allow the Bank to achieve
full compliance. If the proposed Consolidation does not occur, a contingency
plan which includes increased resources and the use of technology consultants is
in place to address and fully implement the Bank's Year 2000 remediation plan.
Bank management does not expect the costs of bringing the Bank's systems into
Year 2000 compliance will have a material adverse effect on the Bank's financial
conditions, results of operations or liquidity. The Bank believes it is in
compliance with regulatory guidelines regarding Year 2000 compliance, including
the timetable for achieving compliance.

                                       50
<PAGE>
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     This section presents an analysis of the financial condition of the Bank at
September 30, 1998 and 1997, and December 31, 1997, 1996, and 1995, and the
results of operations for the nine months ended September 30, 1998 and 1997, and
for the years ended December 31, 1997, 1996, and 1995. This analysis should be
read in conjunction with the financial statements and notes thereto and
financial data presented elsewhere in this proxy statement-prospectus.

     Because Mercantile does not conduct any other investment or business
activities other than holding approximately 96.0% of the outstanding Bank common
stock, the financial condition and results of operations of Mercantile are
materially the same as that of the Bank's. Instead of including a separate
management's discussion and analysis of Mercantile's financial condition and
results of operations, reference is hereby made to the management's discussion
and analysis of financial condition and results of operation of the Bank below.

At September 30, 1998, assets of Mercantile other than its investment in the
Bank totaled $230,000, including cash assets of $138,000. Mercantile had total
liabilities of $14,090,000, consisting substantially of cash advances to
Mercantile in the amount of $2,940,000 from a party related to Mercantile's sole
shareholder, and a note payable of $11,148,000 to the Bank.

Results of Operations

     For the Nine Months Ended September 30, 1998 and 1997

     Generally. Net income for the nine months ended September 30, 1998 was
$5,884,000 ($2.15 per share) compared to $5,543,000 ($2.02 per share) for the
nine months ended September 30, 1997.

     The primary market area for the Bank was negatively affected by a
devaluation of the Mexican Peso in December 1994. As a result, beginning in 1995
and continuing into 1997, the Bank's charge-offs of installment and consumer
loans increased significantly. Charge-offs for the nine months ended September
30, 1998 and 1997 totaled $944,000 and $757,000, respectively, of which 88% and
99%, respectively, were installment and consumer loans. Provisions for loan
losses included in the statement of earnings for the nine months ended September
30, 1998 and 1997 totaled $575, 000 and $525,000, respectively.

     A discussion of changes in the major components of net income for the nine
months ended September 30, 1998 and 1997 are as follows:

     Net Interest Income. Net interest income is the principal source of the
Bank's net income and represents the difference between interest income and
interest expense. Net interest income increased approximately $316,000 in 1998
compared to 1997 as a result of an increase in average interest-earning assets
of $33,751,000 offset by an increase in average interest-bearing liabilities of
$18,272,000. Annualized interest rate spread was 3.03% and 3.21%, and net
interest margin was 3.59% and 3.70% for 1998 and 1997, respectively.

     The following schedules provide a summary of net interest income, average
interest-earning asset balances and the related interest rates/yields for the
nine-month periods indicated. Non-accruing loans are included in the
interest-earning assets; interest income on such loans is recorded when
received.

                                       51
<PAGE>
 
<TABLE>
<CAPTION>
                                                                         September 30, 1998
                                                        ---------------------------------------------------------- 
                                                         Average     Percent of       Interest          Average    
                                                         Balance    Total Assets   Income/Expense   Yield/Rates(1) 
                                                        ---------   ------------   --------------   -------------- 
<S>                                                     <C>            <C>            <C>                <C>  
    Interest-earning assets:                                           (Dollars in Thousands)
         Loans                                           $327,291      38.94 %         $22,463           9.15%
         Taxable investment securities                    322,524      38.37 %          14,735           6.09%
         Nontaxable investment securities                  14,559       1.73 %             543           4.97%
         Interest bearing deposits in other banks             146       0.02 %               7           6.39%
         Federal funds sold and securities
            purchased under agreements to resell           92,801      11.04 %           3,855           5.54%
                                                         --------    -------           -------

              Total interest-earning assets               757,321      90.10 %          41,603           7.32%

    Non interest-bearing assets:
         Cash and due from banks                           33,037       3.93 %
         Bank premises and equipment - net                 39,429       4.69 %
         Accrued interest receivable                        5,800       0.69 %
         Other real estate owned                              944       0.11 %
         Other assets                                       3,654       0.43 %
         Goodwill                                           3,004       0.36 %
         Reserve for loan losses                           (2,627)     (0.31)%
                                                         --------    -------  

              Total assets                               $840,562     100.00 %
                                                         ========    =======  

    Interest-bearing liabilities:
         Savings deposits                                $ 78,160       9.30 %           3,714           6.34%
         Other time deposits                              500,689      59.56 %          14,477           3.86%
         Short-term debt                                   80,243       9.55 %           2,996           4.98%
         Long-term debt                                         -          -                 -              - 
                                                         --------    -------           -------

              Total interest-bearing liabilities          659,092      78.41 %          21,187           4.29%

    Non interest-bearing liabilities:
         Demand deposits                                   91,460      10.88 %
         Other liabilities                                  1,654       0.20 %
         Accrued interest payable                           2,424       0.29 %
                                                         --------    ------- 

              Total liabilities                           754,630      89.78 %
    Stockholders' equity                                   85,932      10.22 %
                                                         --------    -------  

              Total liabilities and stockholders' 
                 equity                                  $840,562     100.00 %
                                                         ========     ======

    Net interest income                                                                $20,416
                                                                                       =======

    Interest rate spread                                                                                 3.03%
                                                                                                         ==== 

                  Net interest margin                                                                    3.59%
                                                                                                         ==== 
</TABLE>

    (1)  Annualized

                                       52
<PAGE>
 
<TABLE>
<CAPTION>
                                                                         September 30, 1997                     
                                                        ---------------------------------------------------------- 
                                                         Average     Percent of       Interest          Average    
                                                         Balance    Total Assets   Income/Expense   Yield/Rates(1) 
                                                        ---------   ------------   --------------   -------------- 
<S>                                                     <C>            <C>            <C>                <C>  
    Interest-earning assets:                                          (Dollars in Thousands)
         Loans                                           $316,661      39.20 %          $22,400           9.43%
         Taxable investment securities                    332,463      41.16 %           15,244           6.11%
         Nontaxable investment securities                  14,890       1.85 %              556           4.98%
         Interest bearing deposits in other banks             101       0.01 %                4           5.28%
         Federal funds sold and securities 
            purchased under agreements to resell           59,455       7.36 %            2,444           5.48%
                                                         --------   --------            -------

              Total interest-earning assets               723,570      89.58 %           40,648           7.49%

    Non interest-bearing assets:
         Cash and due from banks                           30,789       3.81 %
         Bank premises and equipment - net                 40,662       5.03 %
         Accrued interest receivable                        5,922       0.73 %
         Other real estate owned                              567       0.07 %
         Other assets                                       5,623       0.70 %
         Goodwill                                           3,332       0.41 %
         Reserve for loan losses                           (2,722)     (0.33)%
                                                         --------    -------  

              Total assets                               $807,743     100.00 %
                                                         ========    =======  

    Interest-bearing liabilities:
         Savings deposits                                $ 80,291       9.94 %            3,503           5.82%
         Other time deposits                              484,630      60.00 %           14,248           3.92%
         Short-term debt                                   75,899       9.40 %            2,797           4.91%
         Long-term debt                                         -          -                  -               - 
                                                         --------    -------            -------

              Total interest-bearing liabilities          640,820      79.34 %           20,548           4.28%

    Non interest-bearing liabilities:
         Demand deposits                                   87,636      10.85 %
         Other liabilities                                  1,132       0.14 %
         Accrued interest payable                           2,833       0.35 %
                                                         --------    -------  

              Total liabilities                           732,421      90.68 %
    Stockholders' equity                                   75,322       9.32 %
                                                         --------    ------- 

              Total liabilities and stockholders' 
                 equity                                  $807,743     100.00 %
                                                         ========    ======= 

    Net interest income                                                                 $20,100
                                                                                        =======

    Interest rate spread                                                                                  3.21%
                                                                                                          ==== 

                  Net interest margin                                                                     3.70%
                                                                                                          ==== 

</TABLE>

    (1)  Annualized

                                       53
<PAGE>
 
     Net interest income is affected both by the interest rate earned and paid
and by changes in volume, principally in loans, investment securities, deposits
and borrowed funds. The following table depicts the dollar effect and rate
changes for interest-earning assets and interest-bearing liabilities and the
resulting change in interest income and interest expense:

<TABLE>
<CAPTION>
                                                       September 30, 1998 Compared to
                                                             September 30, 1997
                                                         Increase (Decrease) Due to
                                                   --------------------------------------- 
                                                    Volume         Rate(1)            Net  
                                                   --------        -------           ----- 
                                                           (Dollars In Thousands)
<S>                                                 <C>             <C>            <C>     
    Interest earned on:
         Loans                                      $1,002          $(939)          $   63 
         Taxable investment securities                (607)            98             (509)
         Nontaxable investment securities              (16)             3              (13)
         Interest bearing deposits in other banks        2              1                3 
         Federal funds sold and securities
            purchased under agreements to resell     1,827           (416)           1,411 
                                                    ------        -------           ------ 

              Total interest-earning assets          2,208         (1,253)             955 

    Interest paid on:
         Savings deposits                             (124)           335              211 
         Other time deposits                           630           (401)             229 
         Short-term debt                               213            (14)             199 
         Long-term debt                                  -              -                - 
                                                    ------        -------           ------ 

              Total interest-bearing liabilities       719            (80)             639 

              Net interest income                   $1,489        $(1,173)          $  316 
                                                    ======        =======           ====== 
</TABLE>

     ---------------
     (1) Changes in interest income and interest expense due to both rate and
     volume are included in rate variances.

     Noninterest Income. Noninterest income increased by $27,000 for the nine
months ended September 30, 1998 compared with the nine months ended September
30, 1997. This included an increase of $60,000 in other income and a decrease of
$33,000 in service charge income.

     Noninterest Expense. Noninterest expense decreased by $370,000 for the nine
months ended September 30, 1998 compared with the nine months ended September
30, 1997. This included a decrease of $342,000 in salaries and employee benefits
due to attrition.

     For the Years Ended December 31, 1997, 1996, and 1995

     Generally. Net income was $7,801,000 ($2.85 per share), $8,071,000 ($2.95
per share), and $8,280,000 ($3.03 per share) for the years ended December 31,
1997, 1996, and 1995, respectively.

     The decrease in net income for 1997 compared to 1996 is attributable to a
substantial increase in the provision for loan losses of $845,000 for the year
ended December 31, 1997 compared to $263,000 for the year ended December 31,
1996. The substantial increase was due to replenishing the allowance for loan
losses due to significant charge-offs during 1996.

                                       54
<PAGE>
 
     The decrease in net income for 1996 compared to 1995 is attributable to a
realized loss on the sale of securities of $1,278,000 for the year ended
December 31, 1996 compared to a realized gain of $6,000 for the year ended
December 31, 1995.

     The Bank's primary market area was negatively affected by a devaluation of
the Mexican Peso in December 1994. As a result, beginning in 1995 and continuing
into 1997, the Bank's charge-offs of installment and consumer loans increased
significantly. Charge-offs for the year ended December 31, 1997, 1996, and 1995
totaled $1,118,000, $2,709,000 and $797,000 of which 89%, 33% and 86% were
installment and consumer loans, respectively and 67% were commercial, financial,
and agricultural loans for 1996. Provisions for loan losses included in the
statement of earnings for the years ended December 31, 1997, 1996, and 1995,
totaled $845,000, $263,000 and $100,000, respectively.

     A discussion of changes in the major components of net income for the years
ending December 31, 1997, 1996, and 1995 are as follows:

     Net Interest Income. Net interest income is the principal source of the
Bank's net income and represents the difference between interest income and
interest expense. Net interest income increased approximately $3,000 in 1997
compared to 1996 as a result of an increase in interest-earning assets of
$5,327,000 offset by an increase in interest-bearing liabilities of $2,438,000.
Interest rate spread was 3.29% and 3.34%, and net interest margin was 3.78% and
3.81% for 1997 and 1996, respectively.

     Net interest income decreased approximately $534,000 in 1996 compared to
1995 as a result of an increase in interest-earning assets of $37,014,000 offset
by an increase in interest-bearing liabilities of $34,221,000. Interest rate
spread was 3.34% and 3.60%, and net interest margin was 3.81% and 4.09% for 1996
and 1995, respectively.

     The following schedules provide a summary of net interest income, average
interest-earning asset balances and the related interest rates/yields for the
periods indicated. Non-accruing loans are included in the interest-earning
assets; interest income on such loans is recorded when received.

                                       55
<PAGE>
 
<TABLE>
<CAPTION>
                                                                         December 31, 1997                        
                                                        --------------------------------------------------------- 
                                                         Average     Percent of       Interest          Average   
                                                         Balance    Total Assets   Income/Expense     Yield/Rates 
                                                        ---------   ------------   --------------     ----------- 
<S>                                                     <C>            <C>            <C>                <C>  
    Interest-earning assets:                                          (Dollars in Thousands)
         Loans                                           $321,394      39.50 %          $30,940           9.63%
         Taxable investment securities                    327,746      40.29 %           20,029           6.11%
         Nontaxable investment securities                  14,897       1.83 %              741           4.97%
         Interest bearing deposits in other  banks             99       0.01 %                6           6.06%
         Federal funds sold and securities
            purchased under agreements to resell           64,583       7.94 %            3,572           5.53%
                                                         --------     ------            ------- 

              Total interest-bearing assets               728,719      89.57 %           55,288           7.59%

    Non interest-bearing assets:
         Cash and due from banks                           31,783       3.91 %
         Bank premises and equipment - net                 40,534       4.98 %
         Accrued interest receivable                        5,975       0.73 %
         Other real estate owned                              653       0.08 %
         Other assets                                       5,399       0.66 %
         Goodwill                                           3,290       0.40 %
         Reserve for loan losses                           (2,740)     (0.33)%
                                                         --------     ------ 

              Total assets                               $813,613     100.00%
                                                         ========     ====== 

    Interest-bearing liabilities:
         Savings deposits                                $185,721      22.83 %            4,719           2.54%
         Other time deposits                              382,692      47.03 %           19,236           5.03%
         Short-term debt                                   75,818       9.32 %            3,765           4.97%
         Long-term debt                                         -          -                  -              - 
                                                         --------     ------            ------- 

              Total interest-earning liabilities          644,231      79.18 %           27,720           4.30%

    Non interest-bearing liabilities:
         Demand deposits                                   88,657      10.90 %
         Other liabilities                                  1,151       0.14 %
         Accrued interest payable                           2,853       0.35 %
                                                         --------     ------  

              Total liabilities                           736,892      90.57 %
    Stockholders' equity                                   76,721       9.43 %
                                                         --------     ------  

              Total liabilities and stockholders' 
                 equity                                  $813,613     100.00 %
                                                         ========     ====== 

    Net interest income                                                                 $27,568 
                                                                                        ======= 

    Interest rate spread                                                                                  3.29%
                                                                                                          ==== 

    Net interest margin                                                                                   3.78%
                                                                                                          ==== 
</TABLE>

                                       56
<PAGE>
 
<TABLE>
<CAPTION>
                                                                         December 31, 1996                        
                                                        --------------------------------------------------------- 
                                                         Average     Percent of       Interest          Average   
                                                         Balance    Total Assets   Income/Expense     Yield/Rates 
                                                        ---------   ------------   --------------     ----------- 
<S>                                                     <C>            <C>            <C>                <C>  
    Interest-earning assets:                                          (Dollars in Thousands)
         Loans                                           $310,129      38.41 %          $29,101           9.38%
         Taxable investment securities                    344,321      42.64 %           21,494           6.24%
         Nontaxable investment securities                  14,762       1.83 %              733           4.97%
         Interest bearing deposits in other banks           1,507       0.19 %              142           9.42%
         Federal funds sold and securities
            purchased under agreements to resell           52,673       6.53 %            2,848           5.41%
                                                         --------     ------            ------- 

              Total interest-earning assets               723,392      89.58 %           54,318           7.51%

    Non interest-bearing assets:
         Cash and due from banks                           32,452       4.02 %
         Bank premises and equipment - net                 41,048       5.08 %
         Accrued interest receivable                        5,412       0.67 %
         Other real estate owned                              272       0.03 %
         Other assets                                       5,879       0.73 %
         Goodwill                                           3,620       0.45 %
         Reserve for loan losses                           (4,554)     (0.56)%
                                                         --------     ------  

              Total assets                               $807,521     100.00 %
                                                         ========     ====== 


    Interest-bearing liabilities:
         Savings deposits                                $187,778      23.25 %            4,684           2.49%
         Other time deposits                              397,950      49.28 %           19,615           4.93%
         Short-term debt                                   55,902       6.92 %            2,454           4.39%
         Long-term debt                                       163       0.02 %                -              -
                                                         --------     ------            ------- 

              Total interest-bearing liabilities          641,793      79.47 %           26,753           4.17%

    Non interest-bearing liabilities:
         Demand deposits                                   93,199      11.54 %
         Other liabilities                                  1,335       0.17 %
         Accrued interest payable                           2,889       0.36 %
                                                         --------     ------ 

              Total liabilities                           739,216      91.54 %
    Stockholders' equity                                   68,305       8.46 %
                                                         --------     ------  

              Total liabilities and stockholders' 
                equity                                   $807,521     100.00 %
                                                         ========     ======  

    Net interest income                                                                 $27,565
                                                                                        =======

    Interest rate spread                                                                                  3.34%
                                                                                                          ==== 

    Net interest margin                                                                                   3.81%
                                                                                                          ==== 
</TABLE>

                                       57
<PAGE>
 
<TABLE>
<CAPTION>
                                                                         December 31, 1995                        
                                                        --------------------------------------------------------- 
                                                         Average     Percent of       Interest          Average   
                                                         Balance    Total Assets   Income/Expense     Yield/Rates 
                                                        ---------   ------------   --------------     ----------- 
<S>                                                     <C>            <C>            <C>                <C>  
    Interest-earning assets:                                          (Dollars in Thousands)
         Loans                                           $325,533      42.43 %          $31,163           9.57%
         Taxable investment securities                    321,148      41.85 %           20,040           6.24%
         Nontaxable investment securities                  11,685       1.52 %              571           4.89%
         Interest bearing deposits in other banks              12       0.00 %               16         133.33%
         Federal funds sold and securities 
           purchased under agreements to resell            28,000       3.65 %            2,624           9.37%
                                                         --------     ------            ------- 

              Total interest-earning assets               686,378      89.45 %           54,414           7.93%

    Non interest-bearing assets:
         Cash and due from banks                           32,402       4.22 %
         Bank premises and equipment - net                 38,385       5.00 %
         Accrued interest receivable                        5,472       0.71 %
         Other real estate owned                              365       0.05 %
         Other assets                                       5,340       0.70 %
         Goodwill                                           3,946       0.52 %
         Reserve for loan losses                           (4,991)     (0.65)%
                                                         --------     ------  

              Total assets                               $767,297     100.00 %
                                                         ========     ======  


    Interest-bearing liabilities:
         Savings deposits                                $194,680      25.37 %            5,831           3.00%
         Other time deposits                              383,780      50.02 %           18,089           4.71%
         Short-term debt                                   29,112       3.80 %            2,395           8.23%
         Long-term debt                                         -          -                  -              -
                                                         --------     ------            ------- 

              Total interest-bearing liabilities          607,572      79.19 %           26,315           4.33%

    Non interest-bearing liabilities:
         Demand deposits                                   95,789      12.48 %
         Other liabilities                                  2,010       0.26 %
         Accrued interest payable                           2,150       0.28 %
                                                         --------     ------  

              Total liabilities                           707,521      92.21 %
    Stockholders' equity                                   59,776       7.79 %
                                                         --------     ------  

              Total liabilities and stockholders' 
                 equity                                  $767,297     100.00 %
                                                         ========     ======  

    Net interest income                                                                 $28,099
                                                                                        ======= 

    Interest rate spread                                                                                  3.60%
                                                                                                          ==== 

    Net interest margin                                                                                   4.09%
                                                                                                          ==== 
</TABLE>

                                       58
<PAGE>
 
     Net interest income is affected both by the interest rate earned and paid
and by changes in volume, principally in loans, investment securities, deposits
and borrowed funds. The following table depicts the dollar effect and rate
changes for interest-earning assets and interest-bearing liabilities and the
resulting change in interest income and interest expense:

<TABLE>
<CAPTION>
                                                      1997 Compared to 1996           1996 Compared to 1995    
                                                   Increase (Decrease) Due to       Increase (Decrease) Due to              
                                                   ---------------------------    -----------------------------
                                                   Volume    Rate(1)     Net      Volume     Rate(1)     Net   
                                                   -------   -------   -------    --------   -------   ------- 
                                                                         (Dollars In Thousands)
<S>                                                <C>       <C>       <C>        <C>        <C>       <C>     
Interest earned on:
     Loans                                         $ 1,409   $  430    $ 1,839    $(1,966)   $   (96)  $(2,062)
     Taxable investment securities                  (1,379)      (86)   (1,465)     1,928       (474)    1,454 
     Nontaxable investment securities                    9        (1)        8        201        (39)      162 
     Interest bearing deposits in other banks         (177)       41      (136)     2,658     (2,532)      126 
     Federal funds sold and securities
        purchased under agreements to resell           859      (135)      724      3,095     (2,871)      224 
                                                   -------   -------   -------    -------    -------   -------

           Total interest-earning assets               721       249       970      5,916     (6,012)      (96)

Interest paid on:
     Savings deposits                                  (68)      103        35       (275)      (872)   (1,147)
     Other time deposits                            (1,002)      623      (379)       890        636     1,526
     Short-term debt                                 1,165       146     1,311      2,939     (2,880)       59
     Long-term debt                                      -         -         -          -          -         -
                                                   -------   -------   -------    -------    -------   -------

           Total interest-bearing liabilities           95       872       967      3,554     (3,116)      438
                                                   -------   -------   -------    -------    -------   -------

           Net interest income                     $   626   $  (623)  $     3    $ 2,362    $(2,896)  $  (534)
                                                   =======   =======   =======    =======    =======   ======= 
</TABLE>
- --------------
(1)  Changes in interest income and interest expense due to both rate and volume
     are included in rate variances.

     Noninterest Income. Noninterest income increased by $1,113,000 for the year
ended December 31, 1997 compared with the year ended December 31, 1996. This
included an increase of $115,000 in service charge income, a reduction in
security losses from $1,278,000 in 1996 to no losses in 1997, and a decrease in
other income of $280,000.

     Noninterest income decreased by $1,744,000 for the year ended December 31,
1996 compared with the year ended December 31, 1995. This included a decrease of
$131,000 in service charge income, a reduction in security gains from $6,000 in
1995 to a loss of $1,278,000 in 1996, and a decrease in other income of
$329,000.

     Noninterest Expense. Noninterest expense decreased by $23,000 for the year
ended December 31, 1997 compared with the year ended December 31, 1996. This
included a decrease of $283,000 in salaries and employees benefits, a decrease
in other operating expenses of $111,000, an increase in occupancy expenses of
$266,000, and an increase in furniture and equipment expense of $105,000.

     Noninterest expense decreased by $991,000 for the year ended December 31,
1996 compared with the year ended December 31, 1995. This included a decrease of
$660,000 in furniture and equipment expense, a decrease of $639,000 in other
operating expenses, an increase of $236,000 in salaries and employee benefits,
and an increase of $72,000 in occupancy expenses.

                                       59
<PAGE>
 
Financial Condition

     Loans. The Bank's loan portfolio has increased by $23,916,000 from December
31, 1993 to December 31, 1997. The Bank's primary market area was negatively
affected by a devaluation in the Mexican Peso in December 1994. The Bank's
charge-offs of installment and consumer loans significantly increased. As a
result, the Bank concentrated its lending efforts in the area of commercial and
real estate loans, while focusing less on indirect consumer loans. All of the
loan growth from December 31, 1993 to December 31, 1997, was from domestic
commercial and real estate loans.

     The following table sets forth the composition of the loan portfolio for
the periods presented:

<TABLE>
<CAPTION>
                                                         Aggregate Principal Amount                        
                                 ------------------------------------------------------------------------- 
                                   September 30,                         December 31,
                                 ------------------   ---------------------------------------------------- 
                                   1998      1997       1997       1996       1995       1994       1993   
                                 --------  --------   --------   --------   --------   --------   -------- 
                                                         (Dollars In Thousands)
<S>                              <C>       <C>        <C>        <C>        <C>        <C>        <C>      
Type of loan:
     Domestic:
     Commercial, financial
       and agricultural          $ 84,027  $ 83,013   $ 92,987   $ 70,825   $ 78,832   $ 80,607   $ 65,064 
     Interim real estate           21,916    18,329     12,655     10,766      7,549      4,703     15,250 
     Permanent real estate        143,383   139,661    152,128    138,992    113,535    106,850     95,441 
     Consumer loans                40,674    52,419     50,299     60,136     79,477     86,187     99,300 

   Foreign:
     Commercial and industrial     28,822    33,947     34,139     36,186     41,208     44,565     43,237 
                                 --------  --------   --------   --------   --------   --------   -------- 

                                 $318,822  $327,369   $342,208   $316,905   $320,601   $322,912   $318,292 
                                 ========  ========   ========   ========   ========   ========   ======== 
</TABLE>



<TABLE>
<CAPTION>

                                                        Percentage of Loan Portfolio
                                 ------------------------------------------------------------------------- 
                                   September 30,                         December 31,
                                 ------------------   ---------------------------------------------------- 
                                   1998      1997       1997       1996       1995        1994      1993   
                                 --------  --------   --------   --------   --------    --------   ------- 
                                                         (Dollars In Thousands)
<S>                              <C>       <C>        <C>        <C>        <C>         <C>        <C>      
   Domestic:
     Commercial, financial         26.36%    25.36%     27.17%     22.34%     24.60%     24.96%     20.44%
       and agricultural
     Interim real estate            6.87%     5.60%      3.70%      3.40%      2.35%      1.46%      4.79%
     Permanent real estate         44.97%    42.66%     44.45%     43.86%     35.41%     33.09%     29.99%
     Consumer loans                12.76%    16.01%     14.70%     18.98%     24.79%     26.69%     31.20%

   Foreign:
     Commercial and industrial      9.04%    10.37%      9.98%     11.42%     12.85%     13.80%     13.58%
                                  ------    ------     ------     ------     ------     ------     ------ 

                                  100.00%   100.00%    100.00%    100.00%    100.00%    100.00%    100.00%
                                  ======    ======     ======     ======     ======     ======     ====== 
</TABLE>

                                       60
<PAGE>
 
     The following table sets forth the maturity composition and interest
sensitivity of total loans at December 31, 1997:

<TABLE>
<CAPTION>

                                         Nine Months Ended
                                           September 30,           Year ended December 31,
                                         ----------------- --------------------------------------
                                            1998    1997    1997    1996    1995    1994    1993 
                                           ------  ------  ------  ------  ------  ------  ------
                                                        (Dollars in Thousands)
<S>                                        <C>     <C>     <C>     <C>     <C>     <C>     <C>   
Balance at beginning of period             $2,829  $2,685  $2,685  $4,894  $5,289  $5,626  $3,912
Charge-offs:
     Domestic:
          Commercial, financial and 
             agricultural                      81       8     120   1,812     108     201     201
          Interim real estate                   -       -       -       -       -       6      18
          Permanent real estate                32       -       -       1       -       9       -
          Consumer loans                      831     749     998     896     689     515     474

     Foreign:
          Commercial and industrial             -       -       -       -       -       -      13
                                           ------  ------  ------  ------  ------  ------  ------
                                              944     757   1,118   2,709     797     731     706
Recoveries:
     Domestic:
          Commercial, financial and
             agricultural                      20     188     204      32     163     79      256
          Interim real estate                   -               -       -       -      -        4
          Permanent real estate                 6       7      11       3       1      -       11
          Consumer loans                      165     183     202     202     138     50      231

     Foreign:
          Commercial and industrial             -       -       -       -       -       -     123
                                           ------  ------  ------  ------  ------  ------  ------
                                              191     378     417     237     302     129     625
                                           ------  ------  ------  ------  ------  ------  ------
Net charge-offs                               753     379     701   2,472     495     602      81
Additions charged to operations               575     525     845     263     100     265  (1,285)
Reserves established for New First 
   City loans acquired                          -       -       -       -       -       -   3,080
                                           ------  ------  ------  ------  ------  ------  ------

                                           ------  ------  ------  ------  ------  ------  ------
Balance at end of period                   $2,651  $2,831  $2,829  $2,685  $4,894  $5,289  $5,626
                                           ======  ======  ======  ======  ======  ======  ======

Ratio of net charge-offs during the
   period to average loans 
   outstanding during the period             0.23%  0.12%    0.22%   0.80%   0.15%   0.19%   0.03%
                                           ======  ======  ======  ======  ======  ======  ======

</TABLE>

     The allowance for loan losses is not allocated to specific categories of
loans. However, based on the Bank's review of remaining collateral and/or
financial condition of identified loans with characteristically more than a
normal degree of risk, historical loan loss percentages, and economic
conditions; management believes the allowance for loan loss at September 30,
1998, is adequate to cover losses inherent in the portfolio.

     The reserve for loan losses is established through a provision for loan
losses charged to operations. Loans are charged against the reserve for loan
losses when management believes that the collectibility of the principal is
unlikely. The reserve is an amount that management believes will be adequate to
absorb possible losses on existing loans that may become uncollectible, based on
evaluations of the collectibility of loans and prior loan loss experience. The
evaluations take into considerations such factors as changes in the nature and
volume of the loan portfolio, overall portfolio quality, review of specific
problem loans, and current economic conditions that may affect the borrower's
ability to pay. 

                                       61
<PAGE>
 
Accrual of interest is discontinued on a loan when management believes, after
considering economic and business conditions and collection efforts, that the
borrower's financial condition is such that collection of interest is doubtful.
When interest accrual is discontinued, all unpaid accrued interest is reversed.
Interest income is subsequently recognized only to the extent cash payments are
received.

     Non-performing Assets. Non-performing assets are defined as loans
delinquent 90 or more days, non-accrual loans, restructured loans, and
foreclosed assets. Such assets do not necessarily represent future losses to the
Bank since underlying collateral can be sold and the financial condition of the
borrowers may improve. The following table sets forth the detail of
non-performing loans. The Bank had no restructured loans at any of the dates
listed herein.

<TABLE>
<CAPTION>
                                     September 30,                    December 31,
                                   ----------------   --------------------------------------------
                                    1998      1997     1997      1996      1995      1994     1993
                                   ------   -------   ------    ------    ------    -----    -----
<S>                                <C>      <C>       <C>       <C>       <C>       <C>      <C>  
Outstanding loan balances:
Domestic:
  Non-accrual loans                $4,891    $3,194   $3,030    $2,956    $4,640   $2,410   $6,295
  Loans past due 90 days or more      286       438      181       351       272      251    1,720
  Troubled debt restructuring           -         -        -         -         -        -        -

Foreign:
  Non-accrual loans                     -         -        -         -         -        -        -
  Loans past due 90 days or more        -         -        -         -         -        -        -
  Troubled debt restructuring           -         -        -         -         -        -        -

     Total nonperforming loans     $5,177    $3,632   $3,211   $3,307    $4,912    $2,661   $8,015
                                   ======    ======   ======   ======    ======    ======   ======
</TABLE>

     Total non-performing loans as a percentage of total loans was 1.6% and 1.1%
for the nine months ended September 30, 1998 and 1997, respectively, and .6%,
1.0% and 1.5% for the years ended December 31, 1997, 1996, and 1995,
respectively.

     At December 31, 1997, there were no significant commitments to lend
additional funds to borrowers whose loans were considered non-performing.

     Management is not aware of any loans which were not included as
non-performing loans where known information about possible credit problems
causes serious doubt as to the borrower's ability to comply with repayment terms
which may result in such loans becoming non-performing.

     The loan portfolio includes loans to customers in Mexico of $28,822 as of
September 30, 1998 and $34,139, $36,186, and $41,208 as of December 31, 1997,
1996, and 1995, respectively. The loan portfolio does not include any highly
leveraged transaction loans. Senior management closely monitors concentrations
to individual customers and actively participates within their lending areas.
The Bank has written policies that require security for loans including liens on
residential mortgage loans and certain of the other loans secured by real
estate. In addition, policies and procedures are in place to assess the
creditworthiness of borrowers for all loans and commitments. A borrower's
ability to honor loan contracts can be largely dependent upon economic
conditions within the Bank's market areas, on a national level and within
Mexico.

     Investments. The Bank accounts for investments in accordance with Statement
of Financial Accounting Standards No. 115, "Accounting for Certain Investments
in Debt and Equity Securities" ("SFAS 115"). Under SFAS 115, each security is
classified as either trading, available-for-sale, or held-

                                       62
<PAGE>
 
to-maturity. The Bank has no securities held in a trading account. Investments
classified as held-to-maturity are recorded at amortized cost. The securities
classified as available-for-sale are recorded at their fair value. The after-tax
difference between amortized cost and fair value of securities available for
sale is recorded as "unrealized gain (loss) on securities" in the equity section
of the balance sheet. The tax impact is recorded as an adjustment to the
deferred tax liability.

    The following table presents the composition of investments securities for
the periods presented:

<TABLE>
<CAPTION>
                                          September 30,              December 31,
                                       --------------------  --------------------------------
                                         1998       1997       1997       1996        1995
                                       ---------  ---------  ---------- ----------  ---------
                                                      (Dollars In Thousands)
<S>                                    <C>        <C>         <C>        <C>        <C>     
Held to maturity:
     Obligations of states and
       political subdivisions          $  9,756   $ 10,454    $ 10,453   $ 10,659   $ 10,286

Available for sale:
     Equity securities                    3,260      3,176       3,176      3,112      2,943
     U.S. Treasury securities            76,632    115,376      82,158     96,135     62,024
     Obligations of U.S. government
       agencies                          85,783     71,171     111,553     76,942     89,929
     Obligations of states and
       political subdivisions             4,549      4,484       4,504      4,407      3,269
     Mortgage-backed securities          46,504     60,784      58,230     66,247    101,056
     Collateral-mortgage obligations     70,534     73,689      73,270     75,824    113,838
     Other                                  679        678         678        676      2,669
                                       --------   --------   ---------   --------   --------
                                        287,941    329,358     333,569    323,343    375,728
                                       --------   --------   ---------   --------   --------

          Total                        $297,697   $339,812   $ 344,022   $334,002   $386,014

</TABLE>

     Investment Securities--Maturities and Yields. The following tables show the
maturities and yields for the various forms of investment securities at
September 30, 1998 and December 31, 1997:

<TABLE>
<CAPTION>
                                                                       September 30, 1998
                                            ------------------------------------------------------------------------
                                                  In one          After one          After five           After     
                                              year or less    through five years  through ten years     ten years   
                                            ----------------  ------------------  -----------------  ---------------
                                             Amount   Yield     Amount   Yield    Amount    Yield    Amount    Yield
                                            -------   ------    -------  -----    -------   -----    -------   -----
                                                             (Dollars In Thousands)
<S>                                         <C>       <C>     <C>        <C>      <C>       <C>     <C>        <C>  
Equity securities                           $     -      -    $     -       -    $     -       -    $ 3,259    6.01%
U.S. Treasury securities                     27,197   6.23%    49,434    6.40%         -       -          -       - 
Obligations of U.S. government agencies       5,000   4.78%    78,790    6.12%         -       -      1,993    7.00%
Obligations of states and political
   subdivisions(1)                            1,241   6.73%     4,911    7.01%     7,204    7.54%       953    8.06%
Mortgage-backed securities(2)                     -      -      8,348    6.39%     8,705    6.32%    29,450    7.13%
Collateral-mortgage securities                   84   6.50%         -       -     17,322    5.83%    53,128    6.05%
Other                                             -      -        550    7.95%       131    8.76%         -       - 

</TABLE>

                                       63
<PAGE>
 
<TABLE>
<CAPTION>
                                                                       December 31, 1997
                                            ------------------------------------------------------------------------
                                                  In one          After one          After five           After     
                                              year or less    through five years  through ten years     ten years   
                                            ----------------  ------------------  -----------------  ---------------
                                             Amount   Yield     Amount   Yield    Amount    Yield    Amount    Yield
                                            -------   ------    -------  -----    -------   -----    -------   -----
                                                             (Dollars In Thousands)
<S>                                         <C>       <C>     <C>        <C>      <C>       <C>     <C>        <C>  
Equity securities                           $     -      -    $     -       -    $     -       -    $ 3,176    5.83%
U.S. Treasury securities                      7,967   5.38%    74,191    6.34%         -       -          -       - 
Obligations of U.S. government agencies      64,660   5.38%    44,916    6.25%         -       -      1,977    7.00%
Obligations of states and political
   Subdivisions(1)                              695   6.31%     4,486    7.10%     7,960    7.83%     1,816    8.19%
Mortgage-backed securities(2)                     -      -      7,197    6.66%    11,705    6.22%    39,328    7.14%
Collateral-mortgage securities                2,439   7.29%         -       -     13,664    5.79%    57,167    6.06%
Other                                             -      -        550    7.95%       128    8.75%         -       - 
</TABLE>

- ----------------
(1)  Yield presented on a tax-equivalent basis assuming a tax rate of 34% 
(2)  Included in maturity table based on their average remaining life or call 
     date, if applicable

     Deposits. The deposit base provides the major funding source for the Bank's
interest-earning assets. The Bank's deposits have decreased slightly during the
period from December 31, 1994 to December 31, 1997, due to a migration of
deposits to repurchase agreements. Management believes that demand, savings and
certificates of deposit less than $100,000 represent a core of base deposits
while certificates of deposits in excess of $100,000 and public funds are more
interest rate sensitive and, thus, are not viewed as part of the core deposit
base.

     The following table reflects the average balance and average interest rate
paid on deposits for the period presented:

                                              Average       Average 
                                              Balance      Rate Paid
                                              --------     ---------
                                              (Dollars in Thousands)
     September 30, 1998
           Demand deposits                    $ 91,460       0.00%
           NOW and super NOW accounts           75,912       1.65%
           Money market accounts                76,609       2.11%
           Savings deposits                     41,897       2.01%
           Certificates of deposit less 
              than $100,000                    138,789       3.67%
           Certificates of deposits and
              state time deposits of 
              $100,000 or more                 228,342       3.82%
           Individual retirement accounts       17,300       3.90%
                                              --------
                                              $670,309
                                              ========

       September 30, 1997
           Demand deposits                   $  87,636       0.00%
           NOW and super NOW accounts           70,482       1.62%
           Money market accounts                70,750       2.07%
           Savings deposits                     43,526       2.06%
           Certificates of deposit less
              than $100,000                    134,672       3.62%
           Certificates of deposits and
              state time deposits of 
              $100,000 or more                 227,135       3.80%
           Individual retirement accounts       18,356       4.11%
                                              --------
                                              $652,557
                                              ========

                                       64
<PAGE>
 
        December 31, 1997
           Demand deposits                   $ 88,657       0.00%
           NOW and super NOW accounts          71,485       2.15%
           Money market accounts               71,594       2.79%
           Savings deposits                    43,198       2.74%
           Certificates of deposit less
              than $100,000                   135,196       4.75%
           Certificates of deposits and
              state time deposits of 
              $100,000 or more                228,685       5.16%
           Individual retirement accounts      18,255       5.48%
                                             --------
                                             $657,070
                                             ========

        December 31, 1996
           Demand deposits                   $ 93,199       0.00%
           NOW and super NOW accounts          74,915       2.17%
           Money market accounts               68,376       2.64%
           Savings deposits                    45,671       2.75%
           Certificates of deposit less
              than $100,000                   132,023       4.58%
           Certificates of deposits and
              state time deposits of 
              $100,000 or more                245,099       5.08%
           Individual retirement accounts      19,644       5.70%
                                             --------
                                             $678,927
                                             ========

        December 31, 1995
           Demand deposits                   $ 95,789       0.00%
           NOW and super NOW accounts          88,975       2.78%
           Money market accounts               76,692       2.53%
           Savings deposits                    48,610       2.91%
           Certificates of deposit less
              than $100,000                   126,668       4.59%
           Certificates of deposits and
              state time deposits of 
              $100,000 or more                216,409       5.11%
           Individual retirement accounts      21,106       5.72%
                                             --------
                                             $674,249
                                             ========

     The following tables reflect the maturities of certificates and other time
deposits of $100,000 or more as of September 30, 1998 and December 31, 1997:

<TABLE>
<CAPTION>

                                                           September 30, 1998
                                               --------------------------------------------
                                               3 months    3 to 12    Over 12
                                               or less     months      months      Total
                                               ---------  ----------  ---------  ----------
                                                         (Dollars in Thousands)
<S>                                           <C>          <C>         <C>         <C>     
    Certificates of deposit, includes 
       other time deposits of $0              $136,549     $89,472     $1,009      $227,030


                                                            December 31, 1997
                                               --------------------------------------------
                                               3 months    3 to 12    Over 12
                                               or less     months      months      Total
                                               ---------  ----------  ---------  ----------
                                                         (Dollars in Thousands)
    Certificates of deposit, includes
       other time deposits of $970             $143,859    $109,019    $2,646     $255,525

</TABLE>

                                       65
<PAGE>
 
     Return on Equity and Assets. The following table sets forth Mercantile's
ratios for the periods indicated:

<TABLE>
<CAPTION>
                                              September 30,         Year ended December 31,
                                            -------------------    -------------------------
                                              1998       1997        1997     1996     1995
                                            -------    --------    -------- -------- -------

<S>                                          <C>         <C>        <C>      <C>     <C>  
    Return on average assets                 0.93% (1)   0.91% (1)   0.96%    1.00%   1.08%
    Return on average equity                 9.13% (1)   9.81% (1)  10.17%   11.82%  13.85%
    Dividend pay-out ratio on common
     shares                                  0.00%       0.00%       0.00%   33.90%   0.00%
    Equity to assets ratio                  10.22%       9.32%       9.43%    8.46%   7.79%
</TABLE>
    ---------------
    (1)  Annualized

    Short-term borrowings. The amount and interest rates related to short-term
borrowings for the periods presented are as follows:

<TABLE>
<CAPTION>
                                           September 30,          Year ended December 31,
                                        ------------------    -----------------------------
                                          1998       1997       1997       1996       1995
                                        -------    -------    -------    -------    -------
                                                      (Dollars in Thousands)
<S>                                     <C>        <C>        <C>        <C>        <C>    
Federal Funds Purchased:
    Outstanding balance at period-end   $12,600    $ 2,545    $ 1,900    $ 1,100    $   897
    Weighted average interest rate at
     period-end                            4.39%      4.87%      5.52%      5.68%      5.07%
    Highest outstanding balance at   
     any month end                      $12,600    $ 1,900    $ 2,500    $ 2,600    $ 3,000
    Average balance outstanding      
     during period                      $ 1,526    $   744    $ 1,181    $ 1,990    $ 1,507
    Weighted average interest rate   
     during period                         5.07%      5.15%      5.33%      5.14%      5.62%

Securities:
    Outstanding balance at period-end   $74,794    $68,198    $72,246    $84,897    $41,879
    Weighted average interest rate at
     period-end                            4.81%      5.00%      5.08%      4.54%      4.77%
    Highest outstanding balance at   
     any month end                      $80,650    $74,267    $74,267    $89,179    $41,879
    Average balance outstanding      
     during period                      $78,717    $75,155    $74,637    $53,912    $27,605
    Weighted average interest rate   
     during period                         4.55%      4.92%      4.96%      4.41%      4.91%
</TABLE>

    Liquidity. The Bank's principal source of funds consists of deposits,
interest and principal payments on loans and investment securities, sales of
investment securities and borrowings. For the year ended December 31, 1997, the
Bank realized proceeds from sales and maturities of investment securities of
$103,253,000, a net increase in deposits of $30,746,000 and net cash provided by
operating activities of $10,502,000. Funds were used to acquire investment
securities of $109,810,000 and fund a net increase in loans to customers of
$27,388,000. For the year ended December 31, 1996, the Bank realized proceeds
from sales and maturities of investment securities of $129,601,000 and net cash
provided by operating activities of $13,141,000. Funds were used to acquire
investment securities of $82,077,000.

    Asset liquidity is provided by cash and readily marketable assets, which can
be pledged or which will mature in the near future. These include cash, federal
funds sold, and U.S. Government-backed securities. The Bank's liquidity ratio,
defined as cash, U.S. Government-backed securities and federal funds sold as a
percentage of total deposits, was 64.5% and 66.8% as of December 31, 1997 and
1996, respectively. Liability liquidity is provided by access to core funding
sources, principally various

                                       66
<PAGE>
 
customers' interest-bearing accounts in the Bank's market areas. The Bank does
not have and does not solicit brokered deposits.

    Federal funds purchased and short-term borrowings by the Bank are additional
sources of liquidity. These sources of liquidity are short-term in nature and
are used by the Bank as necessary to fund asset growth and meet short-term
liquidity needs. As of December 31, 1997, 1996, and 1995, the Bank had federal
funds purchased of $1,900,00, $1,100,000, and $900,000, respectively. As of
December 31, 1997, 1996, and 1995, the Bank had borrowings on securities sold
under repurchase agreements of $72,246,000, $84,897,000, and $41,879,000,
respectively.

    Capital. The Bank's total shareholders' equity as of September 30, 1998 was
$90,464,000, an increase of $8,002,000 or 9.7% compared with stockholders'
equity of $82,462,000 as of December 31, 1997. Included in the increase was
$5,884,000 from earnings.

    Total shareholders' equity as of December 31, 1997 was $82,462,000, an
increase of $10,087,000 or 13.94% compared with stockholders' equity of
$72,375,000 as of December 31, 1996. Included in the increase was $7,801,000
from earnings and $2,286,000 in unrealized gains from investment securities.

    Total shareholders' equity as of December 31, 1996 was $72,375,000, an
increase of $3,310,000 or 4.79% compared with stockholders' equity of
$69,065,000 as of December 31, 1995. Included in the increase was $8,071,000
from earnings and $97,000 from the issuance of new common stock. Shareholders'
equity was decreased by $2,740,000 by payment of dividends and $2,118,000 in
unrealized losses from investment securities.

    The Bank is subject to various regulatory capital requirements administered
by the federal banking agencies. Failure to meet minimum capital requirements
can initiate certain mandatory and possibly additional discretionary actions by
regulators that, if undertaken, could have a direct material effect on The
Bank's financial statements. Under capital adequacy guidelines and the
regulatory framework for prompt corrective action. The Bank must meet specific
capital guidelines that involve quantitative measures of the Bank's assets,
liabilities, and certain off-balance sheet items as calculated under regulatory
accounting practices. The Bank's capital amounts and classification are also
subject to qualitative judgments by the regulators about components, risk
weightings, and other factors.

    Quantitative measures established by regulation to ensure capital adequacy
require the Bank to maintain minimum amounts and ratios (set forth in the table
below) of total Tier I capital (as defined in the regulations) to risk-weighted
assets (as defined in the regulations) and of Tier I capital (as defined in the
regulations) to average assets (as defined in the regulations). Management
believes that the Bank meets all capital adequacy requirements, as of September
30, 1998, to which it is subject.

    As of December 31, 1997, the most recent notification from the OCC
categorized the Bank as well capitalized under the regulatory framework for
prompt corrective action. To be categorized as well capitalized, the Bank must
maintain minimum total risk-based, Tier I leverage ratios as set forth in the
table. There are no conditions or events since that notification that management
believes have changed the category.

                                       67
<PAGE>
 
    The Bank's actual capital amounts and ratios are presented in the following
table:

<TABLE>
<CAPTION>
                                                                         To Be Well
                                                                      Capitalized Under
                                                      For Capital     Prompt Corrective
                                       Actual      Adequacy Purposes  Action Provisions
                                  ---------------  -----------------  -----------------
                                  Amount    Ratio   Amount     Ratio  Amount    Ratio
                                  -------   -----   -------    -----  -------   -----
                                               (Dollars in Thousands)
<S>                               <C>       <C>     <C>        <C>    <C>       <C>  
As of September 30, 1998:
     Total Capital (to Risk
      Weighted Assets)            $87,913   21.8%   $32,242    8.0%   $40,302   10.0%
     Tier 1 Capital (to Risk
      Weighted Assets)            $85,262   21.2%   $16,121    4.0%   $24,181    6.0%
     Tier 1 Capital (to Average
      Assets)                     $85,262   10.2%   $33,388    4.0%   $41,735    5.0%

As of September 30, 1997:
     Total Capital (to Risk    
      Weighted Assets)            $79,622   20.1%   $31,760    8.0%   $39,700   10.0%
     Tier 1 Capital (to Risk   
      Weighted Assets)            $76,791   19.3%   $15,880    4.0%   $23,820    6.0%
     Tier 1 Capital (to Average
      Assets)                     $76,791    9.6%   $32,037    4.0%   $40,046    5.0%

As of December 31, 1997:
     Total Capital (to Risk   
      Weighted Assets)            $81,960   19.3%   $34,004    8.0%   $42,505   10.0%
     Tier 1 Capital (to Risk  
      Weighted Assets)            $79,131   18.6%   $17,002    4.0%   $25,503    6.0%
     Tier 1 Capital (to Average
      Assets)                     $79,131    9.6%   $33,115    4.0%   $41,394    5.0%

As of December 31, 1996:
     Total Capital (to Risk   
      Weighted Assets)            $73,687   18.6%   $31,651    8.0%   $39,564   10.0%
     Tier 1 Capital (to Risk  
      Weighted Assets)            $71,002   17.9%   $15,826    4.0%   $23,739    6.0%
     Tier 1 Capital (to Average
      Assets)                     $71,002    8.8%   $32,439    4.0%   $40,548    5.0%

As of December 31, 1995:
     Total Capital (to Risk   
      Weighted Assets)            $70,141   18.0%   $31,178    8.0%   $38,792   10.0%
     Tier 1 Capital (to Risk  
      Weighted Assets)            $65,247   16.7%   $15,589    4.0%   $23,384    6.0%
     Tier 1 Capital (to Average
      Assets)                     $65,247    8.2%   $31,784    4.0%   $39,730    5.0%
</TABLE>

Impact of Inflation, Changing Prices and Monetary Policies

    The financial statements and related financial data concerning the Bank
presented in this proxy statement-prospectus have been prepared in accordance
with generally accepted accounting principles, which require the measurement of
financial position and operating results in terms of historical dollars without
considering changes in the relative purchasing power of money over time due to
inflation. The primary effect of inflation on the operation of the Bank is
reflected in increased operating costs. Unlike most industrial companies,
virtually all of the assets and liabilities of a financial institution are
monetary in nature. As a result, changes in interest rates have a more
significant effect on the performance of a financial institution than do the
effects of changes in the general rate of inflation and changes in prices.
Interest rates do not necessarily move in the same direction or in the same
magnitude as the prices of goods and services. Interest rates are highly
sensitive to many factors which are beyond the control of the Bank, including
the influence of domestic and foreign economic conditions and the monetary and
fiscal policies of the United States government and federal agencies,
particularly the Federal Reserve Board. The Federal Reserve Board implements
national monetary policy such as seeking to curb inflation and combat recession
by its open market operations in United States government securities, control of
the discount rate applicable to borrowing by banks and establishment of reserve
requirements against bank deposits. The actions of the Federal Reserve Board in
these areas influence the growth of bank loans, investments and deposits, and
affect the interest rates charged on loans and paid on deposits.

                                       68
<PAGE>
 
The nature, timing and impact of any future changes in federal monetary and
fiscal policies on the Bank and their results of operations are not predictable.


                          CERTAIN REGULATORY AND OTHER
                    CONSIDERATIONS PERTAINING TO WELLS FARGO

    Wells Fargo and its banking subsidiaries are subject to extensive regulation
by federal and state agencies. The regulation of bank holding companies and
their subsidiaries is intended primarily for the protection of depositors,
federal deposit insurance funds and the banking system as a whole and is not in
place to protect stockholders or other investors.

    As discussed in more detail below, this regulatory environment, among other
things, may (a) restrict Wells Fargo's ability to pay dividends on Wells Fargo
common stock, (b) require Wells Fargo to provide financial support to one or
more of its banking subsidiaries, (c) require Wells Fargo and its banking
subsidiaries to maintain capital balances in excess of those desired by
management, and/or (d) require Wells Fargo to pay higher deposit insurance
premiums as a result of the deterioration in the financial condition of
depository institutions in general.

Bank Regulatory Agencies

    Wells Fargo Corporation, as a bank holding company, is subject to regulation
by the Federal Reserve Board under the Bank Holding Company Act.

    Wells Fargo's national banking subsidiaries are regulated by the OCC. Its
state-chartered banking subsidiaries are regulated primarily by the FDIC or the
Federal Reserve Board and applicable state banking agencies. Wells Fargo's
federally insured banking subsidiaries are also subject to regulation by the
FDIC.

    Wells Fargo has other financial services subsidiaries that are subject to
regulation by the Federal Reserve Board and other applicable federal and state
agencies. For example, Wells Fargo's brokerage subsidiary is subject to
regulation by the SEC, the National Association of Securities Dealers, Inc. and
state securities regulators. Wells Fargo's insurance subsidiaries are subject to
regulation by applicable state insurance regulatory agencies. Other nonbank
subsidiaries of Wells Fargo are subject to the laws and regulations of both the
federal government and the various states in which they conduct business.

Bank Holding Company Activities; Interstate Banking

    A bank holding company is generally prohibited under the Bank Holding
Company Act from engaging in nonbanking (i.e., commercial or industrial)
activities, subject to certain exceptions. Specifically, the activities of a
bank holding company, and those companies that it controls or in which it holds
more than 5% of the voting stock, are limited to banking or managing or
controlling banks, furnishing services to its subsidiaries and such other
activities that the Federal Reserve Board determines to be so closely related to
banking as to be a "proper incident thereto." In determining whether an activity
is sufficiently related to banking, the Federal Reserve Board will consider
whether the performance of such activity by the bank holding company can
reasonably be expected to produce benefits to the public (e.g., greater
convenience, increased competition or gains in efficiency) that outweigh
possible adverse effects (e.g., undue concentration of resources, decreased or
unfair competition, conflicts of interest or unsound banking practices).

                                       69
<PAGE>
 
    Under the Interstate Banking Act, which became effective on September 29,
1995, a bank holding company may acquire banks in states other than its home
state, subject to any state requirement that the bank has been organized and
operating for a minimum period of time, not to exceed five years, and the
requirement that the bank holding company not control, prior to or following the
proposed acquisition, more than 10% of the total amount of deposits of insured
depository institutions nationwide or, unless the acquisition is the bank
holding company's initial entry into the state, more than 30% of such deposits
in the state (or such lesser or greater amount set by the state).

    The Interstate Banking Act also authorizes banks to merge across state lines
(thereby creating interstate branches) effective June 1, 1997. States may opt
out of the Interstate Banking Act (thereby prohibiting interstate Mergers in the
state) or opt in early (thereby allowing interstate Mergers prior to June 1,
1997). Wells Fargo will be unable to consolidate its banking operations in one
state with those of another state if either state in question has opted out of
the Interstate Banking Act. The state of Montana has opted out until at least
the year 2001.

    Wells Fargo's acquisitions of banking institutions and other companies
generally are subject to the prior approval of the Federal Reserve Board and
other applicable federal or state regulatory authorities. In determining whether
to approve a proposed bank acquisition, federal banking regulators will
consider, among other factors, the effect of the acquisition on competition, the
public benefits expected to be received from the consummation of the
acquisition, the projected capital ratios and levels on a post-acquisition
basis, and the acquiring institution's record of addressing the credit needs of
the communities it serves, including the needs of low and moderate income
neighborhoods, consistent with the safe and sound operation of the bank, under
the Community Reinvestment Act of 1977, as amended.

Dividend Restrictions

    Wells Fargo is a legal entity separate and distinct from its banking and
other subsidiaries. Its principal source of funds to pay dividends on its common
and preferred stock and debt service on its debt is dividends from its
subsidiaries. Various federal and state statutes and regulations limit the
amount of dividends that may be paid to Wells Fargo by its banking subsidiaries
without regulatory approval.

    Most of Wells Fargo's banking subsidiaries are national banks. A national
bank must obtain the prior approval of the OCC to pay a dividend if the total of
all dividends declared by the bank in any calendar year would exceed the bank's
net income for that year combined with its retained net income for the preceding
two calendar years, less any required transfers to surplus or a fund for the
retirement of any preferred stock.

    Wells Fargo's state-chartered banking subsidiaries also are subject to
dividend restrictions under applicable state law.

    If, in the opinion of the applicable federal regulatory agency, a depository
institution under its jurisdiction is engaged in or is about to engage in an
unsafe or unsound practice (which, depending on the financial condition of the
bank, could include the payment of dividends), the regulator may require, after
notice and hearing, that such bank cease and desist from such practice. The OCC
has indicated that the payment of dividends would constitute an unsafe and
unsound practice if the payment would deplete a depository institution's capital
base to an inadequate level. Under the Federal Deposit Insurance Act, an insured
depository institution may not pay any dividend if the institution is
undercapitalized or if the payment of the dividend would cause the institution
to become undercapitalized. In addition, federal

                                       70
<PAGE>
 
bank regulatory agencies have issued policy statements which provide that
depository institutions and their holding companies should generally pay
dividends only out of current operating earnings.

    The ability of Wells Fargo's banking subsidiaries to pay dividends to Wells
Fargo may also be affected by various minimum capital requirements for banking
organizations, as described below. In addition, the right of Wells Fargo to
participate in the assets or earnings of a subsidiary is subject to the prior
claims of creditors of the subsidiary.

    Wells Fargo Bank, N.A., with the express approval of the OCC, declared
dividends in 1997 and 1996 of $1.5 billion in excess of its net income of $2.0
billion for those years. As a result, before Wells Fargo Bank, N.A. may declare
dividends in 1998 without the prior approval of the OCC, it must have net income
of $1.5 billion plus an amount equal to or greater than the dividends desired to
be declared in 1998. Because it is not expected to have net income of $1.5
billion plus an amount equal to or greater than the dividends expected to be
declared in 1998, Wells Fargo Bank, N.A. must obtain the approval of the OCC
before any dividends are declared in 1998.

Holding Company Structure

    Transfer of Funds from Banking Subsidiaries. Wells Fargo's banking
subsidiaries are subject to restrictions under federal law that limit the
transfer of funds or other items of value from such subsidiaries to Wells Fargo
and its nonbanking subsidiaries (including Wells Fargo, "affiliates") in
so-called "covered transactions." In general, covered transactions include loans
and other extensions of credit, investments and asset purchases, as well as
other transactions involving the transfer of value from a banking subsidiary to
an affiliate or for the benefit of an affiliate. Unless an exemption applies,
covered transactions by a banking subsidiary with a single affiliate are limited
to 10% of the banking subsidiary's capital and surplus and, with respect to all
covered transactions with affiliates in the aggregate, to 20% of the banking
subsidiary's capital and surplus. Also, loans and extensions of credit to
affiliates generally are required to be secured in specified amounts.

    Source of Strength Doctrine. The Federal Reserve Board has a policy that a
bank holding company is expected to act as a source of financial and managerial
strength to each of its subsidiary banks and, under appropriate circumstances,
to commit resources to support each such subsidiary bank. This support may be
required at times when the bank holding company may not have the resources to
provide it. Capital loans by a bank holding company to any of its subsidiary
banks are subordinate in right of payment to deposits and certain other
indebtedness of the subsidiary bank. In addition, in the event of a bank holding
company's bankruptcy, any commitment by the bank holding company to a federal
bank regulatory agency to maintain the capital of a subsidiary bank will be
assumed by the bankruptcy trustee and entitled to a priority of payment.

    Depositor Preference. The FDI Act provides that, in the event of the
"liquidation or other resolution" of an insured depository institution, the
claims of depositors of the institution (including the claims of the FDIC as
subrogee of insured depositors) and certain claims for administrative expenses
of the FDIC as a receiver will have priority over other general unsecured claims
against the institution. If an insured depository institution fails, insured and
uninsured depositors, along with the FDIC, will have priority in payment ahead
of unsecured, nondeposit creditors, including the institution's parent holding
company.

                                       71
<PAGE>
 
    Liability of Commonly Controlled Institutions. Under the FDI Act, an insured
depository institution is generally liable for any loss incurred, or reasonably
expected to be incurred, by the FDIC in connection with (a) the default of a
commonly controlled insured depository institution or (b) any assistance
provided by the FDIC to a commonly controlled insured depository institution in
danger of default. "Default" is defined generally as the appointment of a
conservator or receiver and "in danger of default" is defined generally as the
existence of certain conditions indicating that a default is likely to occur in
the absence of regulatory assistance.

Regulatory Capital Standards and Related Matters

    Risk-Based Capital. The Federal Reserve Board, the OCC and the FDIC have
adopted substantially similar risk-based and leverage capital guidelines for
banking organizations. The guidelines are intended to ensure that banking
organizations have adequate capital given the risk levels of their assets and
off-balance sheet commitments.

    The risk-based capital ratio is determined by classifying assets and certain
off-balance sheet financial instruments into weighted categories, with higher
levels of capital being required for those categories perceived as representing
greater risk. Under the capital guidelines, a banking organization's total
capital is divided into tiers. "Tier 1 capital" consists of common equity,
retained earnings, qualifying noncumulative perpetual preferred stock, a limited
amount of qualifying cumulative perpetual preferred stock and minority interests
in the equity accounts of consolidated subsidiaries, less certain items such as
goodwill and certain other intangible assets. The remainder (Tier 2 and Tier 3
capital) consists of hybrid capital instruments, perpetual debt, mandatory
convertible debt securities, a limited amount of subordinated debt, preferred
stock that does not qualify as Tier 1 capital, and a limited amount of the
allowance for credit losses.

    Under the Federal Reserve Board's risk-based capital guidelines for bank
holding companies, the minimum ratio of total capital (the sum of Tier 1, Tier 2
and Tier 3) to risk-adjusted assets (including certain off-balance sheet items,
such as stand-by letters of credit) is currently 8%. The minimum Tier 1 capital
to risk-adjusted assets is 4%. At December 31, 1998, Wells Fargo's total capital
and Tier 1 capital to risk-adjusted assets ratios were 10.9% and 8.1%,
respectively.

    The Federal Reserve Board also requires bank holding companies to comply
with minimum leverage ratio guidelines. The leverage ratio is the ratio of a
bank holding company's Tier 1 capital to its total consolidated quarterly
average assets, less goodwill and certain other intangible assets. The
guidelines require a minimum leverage ratio of 3% for bank holding companies
that meet certain specified criteria, including having the highest supervisory
rating. All other bank holding companies are required to maintain a minimum
leverage ratio of 4% to 5%. The Federal Reserve Board has not advised Wells
Fargo of any specific leverage ratio applicable to it. At December 31, 1998,
Wells Fargo's leverage ratio was 6.6%.

    The Federal Reserve Board's capital guidelines provide that banking
organizations experiencing internal growth or making acquisitions are expected
to maintain strong capital positions substantially above the minimum supervisory
levels, without significant reliance on intangible assets. Also, the guidelines
indicate that the Federal Reserve Board will consider a "tangible Tier 1
leverage ratio" in evaluating proposals for expansion or new activities. The
tangible Tier 1 leverage ratio is the ratio of a banking organization's Tier 1
capital (excluding intangibles) to total assets (excluding intangibles).

                                       72
<PAGE>
 
    Wells Fargo's banking subsidiaries are subject to risk-based and leverage
capital guidelines substantially similar to those imposed by the Federal Reserve
Board on bank holding companies.

    Other Measures of Capital Adequacy and Safety and Soundness. In assessing a
banking organization's capital adequacy, federal bank regulatory agencies will
also consider the organization's credit concentration risk and risks associated
with nontraditional activities, as well as the organization's ability to manage
those risks. This evaluation will be performed as part of the organization's
regular safety and soundness examination.

    Federal bank regulatory agencies require banking organizations that engage
in significant trading activity to calculate a capital charge for market risk.
Significant trading activity means trading activity of at least 10% of total
assets or $1 billion, whichever is smaller, calculated on a consolidated basis
for bank holding companies. Federal bank regulators may apply the market risk
measure to other banks and bank holding companies as the agency deems necessary
or appropriate for safe and sound banking practices. Each agency may exclude
organizations that it supervises that otherwise meet the criteria under certain
circumstances. The market risk charge will be included in the calculation of an
organization's risk-based capital ratios.

    As an additional means to identify problems in the financial management of
depository institutions, the FDI Act requires federal bank regulatory agencies
to establish certain non-capital safety and soundness standards for institutions
for which they are the primary federal regulator. The standards relate generally
to operations and management, asset quality, interest rate exposure and
executive compensation. The agencies are authorized to take action against
institutions that fail to meet such standards.

    Prompt Corrective Action. The FDI Act requires federal bank regulatory
agencies to take "prompt corrective action" with respect to FDIC-insured
depository institutions that do not meet minimum capital requirements. A
depository institution's treatment for purposes of the prompt corrective action
provisions will depend upon how its capital levels compare to various capital
measures and certain other factors, as established by regulation.

    Federal bank regulatory agencies have adopted regulations that classify
insured depository institutions into one of five capital-based categories. The
regulations use the total capital ratio, the Tier 1 capital ratio and the
leverage ratio as the relevant measures of capital. A depository institution is
(a) "well capitalized" if it has a risk-adjusted total capital ratio of at least
10%, a Tier 1 capital ratio of at least 6% and a leverage ratio of at least 5%
and is not subject to any order or written directive to maintain a specific
capital level; (b) "adequately capitalized" if it has a risk-adjusted total
capital ratio of at least 8%, a Tier 1 capital ratio of at least 4% and a
leverage ratio of at least 4% (3% in some cases) and is not well capitalized;
(c) "undercapitalized" if it fails to meet any of the required minimums for an
adequately capitalized institution; (d) "significantly undercapitalized" if it
has a risk-adjusted total capital ratio of less than 6%, a Tier 1 capital ratio
of less than 3% or a leverage ratio of less than 3%; and (e) "critically
undercapitalized" if its tangible equity is less than 2% of total assets. At
December 31, 1998, all of Wells Fargo's insured depository institutions met the
criteria for well capitalized institutions as set forth above.

                                       73
<PAGE>
 
    A depository institution's primary federal bank regulator is authorized to
downgrade the institution's capital category to the next lower category upon a
determination that the institution is engaged in an unsafe or unsound condition
or is engaged in an unsafe or unsound practice. An unsafe or unsound practice
can include receipt by the institution of a less than satisfactory rating on its
most recent examination with respect to its asset quality, management, earnings
or liquidity.

    The FDI Act generally prohibits a depository institution from making any
capital distribution (including payment of a dividend) or paying any management
fee to its holding company if the depository institution would as a result be
undercapitalized. Undercapitalized depository institutions are subject to a wide
range of limitations on operations and activities (including asset growth) and
are required to submit a capital restoration plan. The federal banking agencies
may not accept a capital plan without determining, among other things, that the
plan is based on realistic assumptions and is likely to succeed in restoring the
depository institution's capital. In addition, for a capital restoration plan to
be acceptable, the depository institution's parent holding company must
guarantee that the institution will comply with the plan. The aggregate
liability of the parent holding company is limited to the lesser of (a) 5% of
the depository institution's total assets at the time it became undercapitalized
or (b) the amount which is necessary (or would have been necessary) to bring the
institution into compliance with all capital standards applicable with respect
to the institution as of the time it fails to comply with the plan. If an
undercapitalized depository institution fails to submit an acceptable plan, it
is treated as if it were significantly undercapitalized.

    Significantly undercapitalized depository institutions may be subject to a
number of requirements and restrictions, including orders to sell sufficient
voting stock to become adequately capitalized, requirements to reduce total
assets and cessation of receipt of deposits from correspondent banks. Critically
undercapitalized institutions are subject to the appointment of a receiver or
conservator.

    Under FDI Act regulations, a bank may not accept brokered deposits (that is,
deposits obtained through a person engaged in the business of placing deposits
with insured depository institutions or with interest rates significantly higher
than prevailing market rates) unless (a) it is well capitalized or (b) it is
adequately capitalized and receives a waiver from the FDIC. A bank that may not
receive brokered deposits also may not offer "pass-through" insurance on certain
employee benefit accounts, unless it provides certain notices to affected
depositors. Also, a bank that is adequately capitalized and that has not
received a waiver from the FDIC may not pay an interest rate on any deposits in
excess of 75 basis points over certain prevailing market rates. There are no
such restrictions on a bank that is well capitalized. At December 31, 1998, all
of Wells Fargo's subsidiary banks were well capitalized.

FDIC Insurance

    Through the Bank Insurance Fund (BIF), the FDIC insures the deposits of
Wells Fargo's depository institution subsidiaries up to prescribed per depositor
limits. The amount of FDIC assessments paid by each BIF member institution is
based on its relative risk of default as measured by regulatory capital ratios
and other factors. Specifically, the assessment rate is based on the
institution's capitalization risk category and supervisory subgroup category. An
institution's capitalization risk category is based on the FDIC's determination
of whether the institution is well capitalized, adequately capitalized or less
than adequately capitalized. An institution's supervisory subgroup category is
based on the FDIC's assessment of the financial condition of the institution and
the probability that FDIC intervention or other corrective action will be
required. Subgroup A institutions are financially sound institutions with few
minor weaknesses; Subgroup B institutions are institutions that demonstrate
weaknesses which, if not corrected, could result in significant deterioration;
and Subgroup C institutions are institutions for which

                                       74
<PAGE>
 
there is a substantial probability that the FDIC will suffer a loss in
connection with the institution unless effective action is taken to correct the
areas of weakness.

    The BIF assessment rate currently ranges from zero to 27 cents per $100 of
domestic deposits, with Subgroup A institutions assessed at a rate of zero and
Subgroup C institutions assessed at a rate of 27 cents. The FDIC may increase or
decrease the assessment rate schedule on a semiannual basis. An increase in the
BIF assessment rate could have a material adverse effect on Wells Fargo's
earnings, depending on the amount of the increase. The FDIC is authorized to
terminate a depository institution's deposit insurance upon a finding by the
FDIC that the institution's financial condition is unsafe or unsound or that the
institution has engaged in unsafe or unsound practices or has violated any
applicable rule, regulation, order or condition enacted or imposed by the
institution's regulatory agency. The termination of deposit insurance with
respect to one or more of Wells Fargo's subsidiary depository institutions could
have a material adverse effect on Wells Fargo's earnings, depending on the
collective size of the particular institutions involved.

    All FDIC-insured depository institutions must pay an annual assessment to
provide funds for the payment of interest on bonds issued by the Financing
Corporation, a federal corporation chartered under the authority of the Federal
Housing Finance Board. The bonds (commonly referred to as FICO bonds) were
issued to capitalize the Federal Savings and Loan Insurance Corporation.
FDIC-insured depository institutions will continue to pay approximately 1.3
cents per $100 of BIF-assessable deposits until the earlier of December 31, 1999
or the last savings and loan association ceases to exist.

Fiscal And Monetary Policies

    Wells Fargo's business and earnings are affected significantly by the fiscal
and monetary policies of the federal government and its agencies. Wells Fargo is
particularly affected by the policies of the Federal Reserve Board, which
regulates the supply of money and credit in the United States. Among the
instruments of monetary policy available to the Federal Reserve are (a)
conducting open market operations in United States government securities, (b)
changing the discount rates of borrowings of depository institutions, (c)
imposing or changing reserve requirements against depository institutions'
deposits, and (d) imposing or changing reserve requirements against certain
borrowing by banks and their affiliates. These methods are used in varying
degrees and combinations to directly affect the availability of bank loans and
deposits, as well as the interest rates charged on loans and paid on deposits.
For that reason alone, the policies of the Federal Reserve Board have a material
effect on the earnings of Wells Fargo's banking subsidiaries and, thus, those of
Wells Fargo.

Competition

    The financial services industry is highly competitive. Wells Fargo's
subsidiaries compete with financial services providers, such as banks, savings
and loan associations, credit unions, finance companies, mortgage banking
companies, insurance companies, and money market and mutual fund companies. They
also face increased competition from non-banking institutions such as brokerage
houses and insurance companies, as well as from financial services subsidiaries
of commercial and manufacturing companies. Many of these competitors enjoy the
benefits of advanced technology, fewer regulatory constraints and lower cost
structures.

                                       75
<PAGE>
 
    The financial services industry is likely to become even more competitive as
further technological advances enable more companies to provide financial
services. These technological advances may diminish the importance of depository
institutions and other financial intermediaries in the transfer of funds between
parties.


                                     EXPERTS

    The supplemental consolidated financial statements of Wells Fargo and
subsidiaries as of December 31, 1997 and 1996, and for each of the years in the
three-year period ended December 31, 1997, incorporated by reference herein,
have been incorporated herein in reliance upon the report of KPMG LLP,
independent certified public accountants, incorporated by reference herein, and
upon the authority of said firm as experts in accounting and auditing. KPMG's 
report contains an explanatory paragraph that states that the supplemental 
consolidated financial statements give retroactive effect to the merger of Wells
Fargo and Norwest Corporation on November 2, 1998, which has been accounted for 
as a pooling of interests as described in Note 1 to the supplemental 
consolidated financial statements.

    The financial statements of the Bank as of December 31, 1997 and 1996 and
for each of the three years in the period ended December 31, 1997 included in
this proxy statement-prospectus have been audited by Burton, McCumber & Cortez,
L.L.P., independent auditors, as stated in their report appearing herein, have
been so included in reliance upon the report of such firm given upon their
authority as experts in accounting and auditing.


                                  LEGAL MATTERS

    Stanley S. Stroup, Executive Vice President and General Counsel of Wells
Fargo, has rendered a legal opinion that the shares of Wells Fargo common stock
offered hereby, when issued in accordance with the Reorganization Agreement,
will be validly issued, fully paid and nonassessable. Mr. Stroup beneficially
owns shares of Wells Fargo common stock and options to purchase additional
shares of Wells Fargo common stock. As of the date of this proxy
statement-prospectus, the number of shares Mr. Stroup owns or has the right to
acquire upon exercise of his options is, in the aggregate, less than 0.1% of the
outstanding shares of Wells Fargo common stock.

    The material U.S. Federal income tax consequences of the Consolidation to
the Bank's shareholders and certain other legal matters will be passed upon for
the Bank by Kilpatrick Stockton LLP.


                  INFORMATION CONCERNING WELLS FARGO MANAGEMENT

    Information concerning executive compensation, the principal holders of
voting securities, certain relationships and related transactions, and other
related matters concerning Wells Fargo is included or incorporated by reference
in its annual report on Form 10-K for the year ended December 31, 1997. Wells
Fargo's annual report has been delivered with this proxy statement-prospectus
and is incorporated by reference into this proxy statement-prospectus."

                                       76
<PAGE>
 
                       WHERE YOU CAN FIND MORE INFORMATION

    Wells Fargo files annual, quarterly and current reports, proxy statements
and other information with the SEC. You may read and copy any reports,
statements or other information filed by Wells Fargo at the SEC's public
reference rooms in Washington, D.C., New York, New York and Chicago, Illinois.
You can request copies of these documents, upon payment of a duplicating fee, by
writing to the SEC. Please call the SEC at 1-800-SEC-0330 for further
information on the public reference rooms. Wells Fargo's SEC filings are also
available to the public from commercial document retrieval services and on the
SEC Internet site (http://www.sec.gov).

    Wells Fargo filed a registration statement on Form S-4 to register with the
SEC the Wells Fargo common stock to be issued to Mercantile and Bank
shareholders in the Transactions. This proxy statement-prospectus is part of
that registration statement. As allowed by SEC rules, this proxy
statement-prospectus does not contain all of the information you can find in the
registration statement or the exhibits to the registration statement.

    Some of the information you may want to consider in deciding how to vote on
the Consolidation is not physically included in this proxy statement-prospectus.
Instead, the information is "incorporated by reference" to documents filed as
appendixes to this proxy statement-prospectus or to documents that have been
filed by Wells Fargo with the SEC under SEC File No. 1-2979. Wells Fargo has
delivered with this proxy statement-prospectus copies of all reports
incorporated by reference into this proxy statement-prospectus, excluding
exhibits other than those that are specifically incorporated by reference to an
exhibit in this proxy statement-prospectus.

    The Wells Fargo documents that have been incorporated by reference, copies
of which are being delivered to Bank shareholders with this proxy
statement-prospectus, consist of:

    *   Wells Fargo's annual report on Form 10-K for the year ended December 31,
        1997;

    *   Wells Fargo's quarterly reports on Form 10-Q for the quarters ended
        March 31, 1998, June 30, 1998 and September 30, 1998;

    *   Wells Fargo's current reports on Form 8-K filed January 22, 1998, April
        20, 1998, April 22, 1998, June 8, 1998, June 9, 1998, June 12, 1998,
        July 22, 1998, August 5, 1998, October 21, 1998, October 22,1998,
        November 16, 1998, and January 29, 1999;

    *   Wells Fargo's registration statement on Form S-4 filed September 11,
        1998 (Reg. No. 333-63247) containing the joint proxy
        statement-prospectus of Norwest Corporation (now Wells Fargo) and old
        Wells Fargo;

    *   Wells Fargo's current report on Form 8-K filed October 13, 1997,
        containing a description of the Wells Fargo common stock;

    *   Wells Fargo's registration statement on Form 8-A dated October 21, 1998,
        containing a description of preferred stock purchase rights attached to
        shares of Wells Fargo common stock; and

                                       77
<PAGE>
 
    *   Wells Fargo's current report on Form 8-K filed January 19, 1999
        supplementing the Form 10-K for the year ended December 31, 1997 and the
        Form 10-Q for the quarter ended September 30, 1998 filed by Norwest
        Corporation with, among other information, restated financial statements
        reflecting the combination of Norwest Corporation and old Wells Fargo.

    All reports and proxy statements filed by Wells Fargo after the date of this
proxy statement-prospectus and before the special meeting are automatically
incorporated by reference into this proxy statement-prospectus.

    This proxy statement-prospectus may contain information that updates,
modifies or is contrary to information in one or more of the documents
incorporated by reference. Reports filed by Wells Fargo with the SEC after the
date of this proxy statement-prospectus may also contain information that
updates, modifies or is contrary to information in the documents incorporated by
reference. You should review these reports, as they may disclose a change in the
business prospects, financial condition or other affairs of Wells Fargo since
the date of this proxy statement-prospectus. As explained above, you may also
read and copy any such reports filed with the SEC at the SEC's public reference
rooms, or obtain them from commercial document retrieval services and on the SEC
Internet site.


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

        In deciding how to vote on the Consolidation, you should rely only
    on the information contained or incorporated by reference in this proxy
    statement-prospectus. Neither Wells Fargo nor the Bank has authorized
    any person to provide you with any information that is different from
    what is contained in this proxy statement-prospectus. This proxy
    statement-prospectus is dated February __, 1999. You should not assume
    that the information contained in this proxy statement-prospectus is
    accurate as of any date other than such date, and neither the mailing to
    you of this proxy statement-prospectus nor the issuance to you of shares
    of Wells Fargo common stock will create any implication to the contrary.
    This proxy statement-prospectus does not constitute an offer to sell or
    a solicitation of any offer to buy any securities, or the solicitation
    of a proxy, in any jurisdiction in which, or to any person to whom, it
    is unlawful to make any such offer or solicitation.

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

                                       78
<PAGE>
 
               Report of Independent Certified Public Accountants
               --------------------------------------------------


Board of Directors
Mercantile Bank, National Association

We have audited the accompanying balance sheets of Mercantile Bank, National
Association as of December 31, 1997 and 1996, and the related statements of
earnings, stockholders' equity and cash flows for each of the three years in the
period ended December 31, 1997. These financial statements are the
responsibility of the Bank's management. Our responsibility is to express an
opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Mercantile Bank, National
Association as of December 31, 1997 and 1996, and the results of its operations
and its cash flows for each of the three years in the period ended December 31,
1997 in conformity with generally accepted accounting principles.


                                      Burton McCumber & Cortez, L.L.P.


Brownsville, Texas
February 25, 1998

                                      F-1
<PAGE>
 
                      Mercantile Bank, National Association

                                 BALANCE SHEETS

                    (amounts in thousands, except share data)


                                     ASSETS

                                       September 30,  December 31,  December 31,
                                             1998         1997          1996
                                           --------     --------     --------
                                          (Unaudited)

Cash and due from banks                    $ 31,456     $ 39,664     $ 37,478
Federal funds sold                          146,140       87,195       94,985
                                           --------     --------     --------
     Cash and cash equivalents              177,596      126,859      132,463

Investment securities (notes A1 and B)
   Available-for-sale                       287,941      333,569      323,343
   Held-to-maturity                           9,756       10,453       10,659
                                           --------     --------     --------

     Total investment securities            297,697      344,022      334,002


Loans - net (notes A2, A3, C and D)         315,766      338,815      312,898
Bank premises and equipment - net
 (notes A4 and E)                            38,590       40,023       41,103
Accrued interest receivable                   5,988        5,707        5,744
Other real estate owned (note F)                901          954          251
Other assets (note A7 and G)                  4,636        6,056        7,820
                                           --------     --------     --------

Total assets                               $841,174     $862,436     $834,281
                                           ========     ========     ========


        The accompanying notes are an integral part of these statements.

                                      F-2
<PAGE>
 
                      Mercantile Bank, National Association

                           BALANCE SHEETS - CONTINUED

                    (amounts in thousands, except share data)


                      LIABILITIES AND STOCKHOLDERS' EQUITY

<TABLE>
<CAPTION>
                                            September 30,   December 31,   December 31,
                                                 1998           1997          1996
                                               ---------     ---------     ---------
                                              (Unaudited)
<S>                                            <C>           <C>           <C>      
Deposits
  Non interest-bearing                         $  91,384     $  95,623     $  96,764
  Interest-bearing (note M)                      567,358       604,939       573,052
                                               ---------     ---------     ---------
Total deposits                                   658,742       700,562       669,816

Federal funds purchased and securities
 sold under repurchase agreements
 (note O)                                         87,394        74,146        85,997
Accrued interest payable                           2,330         3,335         3,263
Other liabilities (note G)                         2,244         1,931         2,830
                                               ---------     ---------     ---------
       Total liabilities                         750,710       779,974       761,906
                                               ---------     ---------     ---------

Commitments and contingencies
 (note H and L)                                     --            --            --   

Stockholders' Equity
  Common stock - $1 par value;
   30,000,000 shares authorized;
   2,739,928 issued and outstanding
   in 1997 and 1996                                2,740         2,740         2,740
  Capital in excess of par value                  19,674        19,674        19,674
  Retained earnings                               65,720        59,836        52,035
  Net unrealized gain (loss) on
   securities available-for-sale, net of
   tax expense (benefit) of $108 and
   $(1,068) in 1997 and 1996,
   respectively                                    2,330           212        (2,074)
                                               ---------     ---------     ---------
Total stockholders' equity                        90,464        82,462        72,375
                                               ---------     ---------     ---------
Total liabilities and stockholders' equity     $ 841,174     $ 862,436     $ 834,281
                                               =========     =========     =========
</TABLE>

                                      F-3
<PAGE>
 
                      Mercantile Bank, National Association

                             STATEMENTS OF EARNINGS

                    (amounts in thousands, except share data)

<TABLE>
<CAPTION>
                                               Nine Months Ended
                                                 September 30,                    Year Ended December 31,
                                          --------------------------    -----------------------------------------
                                              1998           1997           1997           1996           1995
                                          -----------    -----------    -----------    -----------    -----------
                                          (Unaudited)    (Unaudited)
<S>                                       <C>            <C>            <C>            <C>            <C>            
Interest income
 (notes A2 and K)                         $    41,603    $    40,648    $    55,288    $    54,318    $    54,414
Interest expense (note N)                      21,187         20,548         27,720         26,753         26,315
                                          -----------    -----------    -----------    -----------    -----------

  Net interest income
  before provision for loan
  losses                                       20,416         20,100         27,568         27,565         28,099

Provision for loan losses
 (notes A3 and D)                                (575)          (525)          (845)          (263)          (100)
                                          -----------    -----------    -----------    -----------    -----------

  Net interest income after
  provision for loan
  losses                                       19,841         19,575         26,723         27,302         27,999

Other income
  Service charges on deposit accounts           2,734          2,767          3,651          3,536          3,667
  Net realized (loss) on sales of
   securities (note B)                           --             --             --           (1,278)             6
  Other income (note K)                         2,286          2,226          2,796          3,076          3,405
                                          -----------    -----------    -----------    -----------    -----------
     Total other income-net                     5,020          4,993          6,447          5,334          7,078
                                          -----------    -----------    -----------    -----------    -----------

Other expenses
  Salaries and employee benefits                8,266          8,608         11,347         11,630         11,394
  Occupancy expense (notes A9, E and H)         2,744          2,736          1,831          1,565          1,493
  Furniture and equipment expense                --             --            3,413          3,308          3,968
  Other operating expenses                      5,242          5,278          5,414          5,525          6,164
                                          -----------    -----------    -----------    -----------    -----------
     Total other expenses                      16,252         16,622         22,005         22,028         23,019
                                          -----------    -----------    -----------    -----------    -----------

Income before income tax expense                8,609          7,946         11,165         10,608         12,058

Income tax expense (benefit)
 (notes A5 and G)
     Currently payable                          2,995          1,926          3,103          3,436          3,895
     Deferred                                    (270)           477            261           (899)          (117)
                                          -----------    -----------    -----------    -----------    -----------
                                                2,725          2,403          3,364          2,537          3,778
                                          -----------    -----------    -----------    -----------    -----------

          NET INCOME                      $     5,884    $     5,543    $     7,801    $     8,071    $     8,280
                                          ===========    ===========    ===========    ===========    ===========

Basic Earnings Per Share:
  Net Income                              $      2.15    $      2.02    $      2.85    $      2.95    $      3.03
                                          ===========    ===========    ===========    ===========    ===========

Weighted average common
  shares outstanding                        2,739,928      2,739,928      2,739,928      2,739,332      2,735,886
                                          ===========    ===========    ===========    ===========    ===========
</TABLE>

        The accompanying notes are an integral part of these statements.

                                      F-4
<PAGE>
 
                      Mercantile Bank, National Association

                        STATEMENT OF STOCKHOLDERS' EQUITY

                    (amounts in thousands, except share data)

<TABLE>
<CAPTION>
                                                                                                     Net
                                                                                                  unrealized
                                                                                                 gain (loss) on
                                         Number of                   Capital                     Available-for-     Total
                                          Common        Common     In Excess of    Retained          Sale       Stockholders'
                                          Shares         Stock       Par Value     Earnings       Securities       Equity
                                         ---------     ---------     ---------     ---------      ---------      ---------
<S>                                      <C>           <C>           <C>           <C>            <C>            <C>
Balance at January 1, 1996               2,735,886     $   2,736     $  19,581     $  46,704      $      44      $  69,065

Sale of 4,042 shares of stock                4,042             4            93          --             --               97

Net earnings for the year                     --            --            --           8,071           --            8,071

Cash dividend paid - $1.00 per share          --            --            --          (2,740)          --           (2,740)

Unrealized loss on available-
for-sale securities, net of
taxes of $1,092                               --            --            --            --           (2,118)        (2,118)
                                         ---------     ---------     ---------     ---------      ---------      ---------

Balance at December 31, 1996             2,739,928         2,740        19,674        52,035         (2,074)        72,375

Net earnings for the year                     --            --            --           7,801           --            7,801

Unrealized gain on available-
for-sale securities,net of tax
benefit of $1,177                             --            --            --            --            2,286          2,286
                                         ---------     ---------     ---------     ---------      ---------      ---------

Balance at December 31, 1997             2,739,928         2,740        19,674        59,836            212         82,462

Net earnings for nine months                  --            --            --           5,884           --            5,884

Unrealized gain on available-
for-sale securities, netof tax
benefit of $1,092                             --            --            --            --            2,118          2,118
                                         ---------     ---------     ---------     ---------      ---------      ---------
Balance at September 30,
 1998 (unaudited)                        2,739,928     $   2,740     $  19,674     $  65,720      $   2,330      $  90,464
                                         =========     =========     =========     =========      =========      =========

</TABLE>

        The accompanying notes are an integral part of these statements.

                                      F-5
<PAGE>
 
                      Mercantile Bank, National Association

                            STATEMENTS OF CASH FLOWS

                    (amounts in thousands, except share data)

<TABLE>
<CAPTION>
                                                    Nine Months Ended             Year Ended December 31,
                                                      September 30,        -----------------------------------
                                                    1998         1997         1997         1996         1995
                                                 ---------    ---------    ---------    ---------    ---------
                                                (Unaudited)  (Unaudited)
<S>                                              <C>          <C>            <C>            <C>            <C>
(Decrease) increase in cash and
cash equivalents

Cash flows from operating activities:
  Net income                                     $   5,884    $   5,543    $   7,801    $   8,071    $   8,280
  Adjustments to reconcile net earnings
   to net cash provided by operating
   activities:
      Provision for loan loss                          575          525          845          263          100
      Loan origination costs                            --           --           --          685          612
      Loan purchase discount
       amortization                                     --         (430)        (573)        (632)        (633)
      Provision for depreciation and
       amortization                                  2,337        2,209        2,981        2,676        2,932
      Net loss on sale of securities                    --           --           --        1,278           (6)
      Net gain on sale of bank premises and
       equipment                                        (6)         (17)         (15)         (36)          -- 
      (Gain) loss on sale of other real estate        (115)           9           (8)         (54)          -- 
      Decrease (increase) in deferred
       income taxes                                   (270)         477          261         (899)        (117)
      Decrease (increase) in accrued interest
       receivable                                     (281)      (1,120)          37          810       (1,193)
      (Decrease) Increase in accrued
       interest payable                             (1,005)        (613)          72          322        1,446
      (Decrease) increase in other
       liabilities                                     187       (1,125)        (899)         657       (1,425)
                                                 ---------    ---------    ---------    ---------    ---------

      Net cash provided by operating
       activities                                    7,306        5,458       10,502       13,141        9,996

Cash flows from investing activities:
      Purchase of securities available-for-
       sale                                        (56,650)     (60,000)    (109,810)     (81,128)    (170,065)
      Proceeds from sale and maturities of
       securities available-for-sale               106,184       56,808      103,053      127,154      104,351
      Purchases of securities to be held-to-
       maturity                                         --           --           --         (949)          -- 
      Proceeds from maturities of
       securities held-to-maturity                      --           --          200        2,447       13,060
      Increase (decrease) in other assets               49          237          (27)        (666)      (1,312)
      Purchase of bank premises and
       equipment                                      (668)      (1,000)      (1,472)      (2,056)      (5,314)
      Proceeds from sale of bank premises
       and equipment                                   497          195           26           51            4
      Recoveries of loans charged-off                  191          378          417          237          302
      Net (increase) decrease in loans              22,400      (10,872)     (27,388)         450         (998)
                                                 ---------    ---------    ---------    ---------    ---------

         Net cash (used) provided by
          investing activities                      72,003      (14,254)     (35,001)      45,540      (59,972)
</TABLE>

        The accompanying notes are an integral part of these statements.

                                      F-6
<PAGE>
 
                      Mercantile Bank, National Association

                      STATEMENTS OF CASH FLOWS - CONTINUED

                    (amounts in thousands, except share data)

<TABLE>
<CAPTION>                                    Nine Months Ended
                                               September 30,              Year Ended December 31,
                                          ----------------------    -----------------------------------
                                             1998         1997         1997         1996         1995
                                          ---------    ---------    ---------    ---------    ---------
                                         (Unaudited)  (Unaudited)
<S>                                       <C>          <C>          <C>          <C>          <C>
Cash flows from financing
 activities:
  Net decrease in non interest-bearing
   deposits                               $  (4,239)   $  (6,956)   $  (1,141)   $    (356)   $  (9,820)
  Net increase (decrease) in interest-
   bearing deposits                         (15,062)     (22,410)      26,492      (19,310)     (21,723)
  Net increase (decrease) in
   certificates of deposit                  (22,519)      12,479        5,395       (6,466)      49,259
  Net increase (decrease) in federal
   funds purchased and securities sold
   under agreements to repurchase            13,248      (15,254)     (11,851)      43,221       18,018
  Proceeds from sale of common stock             --           --           --           97           -- 
  Dividends paid                                 --           --           --       (2,740)          -- 
                                          ---------    ---------    ---------    ---------    ---------
             Net cash (used) provided
              by financing activities       (28,572)     (32,141)      18,895       14,446       35,734
                                          ---------    ---------    ---------    ---------    ---------
             NET (DECREASE)
              INCREASE IN CASH               50,737      (40,937)      (5,604)      73,127      (14,242)

CASH AND CASH EQUIVALENTS AT
   BEGINNING OF YEAR                        126,859      132,463      132,463       59,336       73,578
                                          ---------    ---------    ---------    ---------    ---------
CASH AND CASH EQUIVALENTS AT
   END OF YEAR                            $ 177,596    $  91,526    $ 126,859    $ 132,463    $  59,336
                                          =========    =========    =========    =========    =========

</TABLE>

        The accompanying notes are an integral part of these statements.

                                      F-7
<PAGE>
 
                      Mercantile Bank, National Association

                          NOTES TO FINANCIAL STATEMENTS

                    (amounts in thousands, except share data)


NOTE A - SUMMARY OF ACCOUNTING POLICIES

    During 1995, the majority stockholder of Mercantile Bank, National
    Association (Bank) contributed all of his shares in the Bank (representing
    95.85% of all issued and outstanding shares) to Hemisphere Financial, Ltd.
    (HFL), a British Virgin Island corporation wholly owned by that stockholder.
    HFL contributed those shares to Mercantile Financial Enterprises, Inc.
    (MFE), a wholly owned subsidiary of HFL. As a result of the transactions,
    both MFE and HFL became bank holding companies.

    The Bank provides a variety of banking services to individuals and
    businesses in the South Texas and Northern Mexico area. The accounting
    policies of the Bank conform to practices within the banking industry and
    are based on generally accepted accounting principles. A summary of the
    significant accounting and reporting policies consistently applied in the
    preparation of the accompanying financial statements follows.

    1. Investment Securities
       ---------------------

    In accordance with Statement of Financial Accounting Standards Board No. 115
    "Accounting for Certain Investments in Debt and Equity Securities" (FASB
    115), the Bank is required to classify investments in marketable equity
    securities and all debt securities as trading securities, available-for-sale
    securities, or held-to-maturity securities. The Statement requires trading
    securities and available-for-sale securities to be carried at fair value,
    with unrealized holding gains and losses of trading securities included in
    the determination of net income and unrealized holding gains and losses of
    available-for-sale securities included in equity. Held-to-maturity
    securities are to be carried at amortized cost.

    Investment securities are adjusted for accretion of discounts and
    amortization of premiums. The adjusted carrying amount of the specific
    securities sold is used to compute gains or losses on the sale of
    securities.

    2. Loan Income Recognition
       -----------------------

    Unearned discount on loans made on a discounted basis is taken into income
    under a method which approximates the interest method.

    3. Reserve for Loan Losses
       -----------------------

    The reserve for loan losses is established through a provision for loan
    losses charged to operations. Loans are charged against the reserve for loan
    losses when management believes that the collectibility of the principal is
    unlikely. The reserve is an amount that management believes will be adequate
    to absorb possible losses on existing loans that may become uncollectible,
    based on evaluations of the collectibility of loans. The evaluation takes
    into consideration such factors as changes in the nature and volume of the
    loan portfolio, overall portfolio quality, review of specific problem loans,
    and current economic conditions that may affect the borrower's ability to
    pay. Accrual of interest is discontinued on a loan when management believes,
    after considering economic and business conditions and collection efforts,
    that the borrower's financial condition is such that collection of interest
    is doubtful.

                                      F-8
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE A - SUMMARY OF ACCOUNTING POLICIES - CONTINUED

    3. Reserve for Loan Losses - Continued
       -----------------------------------

    When interest accrual is discontinued, all unpaid accrued interest is
    reversed. Interest income is subsequently recognized only to the extent cash
    payments are received.

    4. Bank Premises and Equipment
       ---------------------------

    Bank premises and equipment are stated at cost less accumulated
    depreciation. Depreciation is provided principally on the straight-line
    basis over the estimated useful life of each type of asset.

    5. Income Tax
       ----------

    The Bank files a consolidated income tax return with its parent company,
    MFE.

    Under the liability method specified by Statement of Financial Accounting
    Standards No. 109, "Accounting for Income Taxes" (FASB 109), deferred tax
    assets and liabilities are determined based on the difference between the
    financial statement and tax bases of assets and liabilities as measured by
    the enacted tax rates which will be in effect when these differences
    reverse. Deferred tax expense is the result of changes in deferred tax
    assets and liabilities. The principal types of differences between assets
    and liabilities for financial statement and tax return purposes are
    accumulated depreciation, loan loss provisions and goodwill amortization.

    6. Cash and cash equivalents
       -------------------------

    Cash and cash equivalents include cash and due from banks and federal funds
    sold.

    7. Excess of Cost over Net Assets Acquired (Goodwill)
       --------------------------------------------------

    Goodwill is being amortized over 15 years on a straight-line basis.

    8. Loan Commitment Fees and Loan Origination Costs
       -----------------------------------------------

    Loan origination fees and certain direct loan origination costs are deferred
    and the net amount amortized as an adjustment of the related loan's yield
    over the life of the loan where such amounts are material to the financial
    statements.

    9. Income from Rental Operations
       -----------------------------

    A portion of the Bank's premises is rented under operating lease
    arrangements. Rentals are reported as income over the lease term as they
    become receivable.

                                      F-9
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE A - SUMMARY OF ACCOUNTING POLICIES - CONTINUED

    10. Use of Estimates
        ----------------

    The preparation of financial statements in conformity with generally
    accepted accounting principles requires management to make estimates and
    assumptions that affect the reported amount of assets and liabilities and
    disclosures of contingent assets and liabilities at the date of the
    financial statements and the reported amounts of revenue and expenses during
    the reporting period. Actual results could differ from those estimates.

    11. Unaudited Financial Statements
        ------------------------------

    The balance sheets as of September 30, 1998 and 1997, and the related
    statements of earnings, stockholders' equity and cash flows for the nine
    months ended September 30, 1998 and 1997 have been prepared without audit.
    In the opinion of management, the financial statements include all
    adjustments (which include only normal recurring adjustments) necessary to
    present fairly the financial position as of September 30, 1998 and 1997 and
    the results of their operations and their cash flows for the nine months
    ended September 30, 1998 and 1997.

    12. Earnings Per Share
        ------------------

    Earnings per share amounts are calculated based on the weighted average
    number of shares outstanding during each period presented.

    13. Impairment of Long-Lived Assets
        -------------------------------

    The Financial Accounting Standards Board issued Statement of Financial
    Accounting Standards No. 121, "Accounting for the Impairment of Long-Lived
    Assets and for Long-Lived Assets to be Disposed of (FASB 121)" effective for
    fiscal years beginning after December 15, 1995. The provisions of FASB 121
    require the Bank to review long-lived assets and certain identifiable
    intangibles for impairment whenever events or changes in circumstances
    indicate that the carrying amount of an asset may not be recoverable. If it
    is determined that an impairment has occurred, the amount of the impairment
    will be charged to operations. No impairments were recognized in 1997 or
    1996.

                                      F-10
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE  B - INVESTMENT SECURITIES

    In accordance with a special report issued by the Financial Accounting
    Standards Board dated November 1995 entitled "A Guide to Implementation of
    Statement 115 on Accounting for Certain Investments in Debt and Equity
    Securities," except for a portion of the obligations of states and political
    subdivisions, the Bank reclassified all of its investment securities
    holdings to available-for-sale.

    The cost and approximate fair values of investment securities are as
    follows:

          1997                              Gross        Gross                 
       Securities            Amortized    Unrealized   Unrealized              
    Available-for-Sale          Cost        Gains        Losses      Fair Value
    ------------------        --------     --------     --------     ---------- 
    Equity Securities         $  3,176     $     --     $     --      $  3,176 
    U.S. Treasury                                                              
     securities                 81,469          855         (166)       82,158 
    Obligations of U.S.                                                        
     government                                                                
     agencies                  111,783           90         (320)      111,553 
    Obligations of states                                                      
     and political                                                             
     subdivision                 4,331          173           --         4,504 
    Mortgage-backed                                                            
     securities                 57,567          826         (163)       58,230 
    Collateral-mortgage                                                        
     obligations                74,245          113       (1,088)       73,270 
    Other                          678           --           --           678 
                              --------     --------     --------      -------- 
    Totals                    $333,249     $  2,057     $ (1,737)     $333,569 
                              ========     ========     ========      ======== 

          1997                              Gross        Gross                 
       Securities            Amortized    Unrealized   Unrealized              
    Held-to-Maturity            Cost        Gains        Losses      Fair Value
    ----------------          --------     --------     --------     ---------- 
    Obligations of states
      and political
      subdivisions            $ 10,453     $    364     $     --      $ 10,817
                              ========     ========     ---=====      ========

                                      F-11
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE B - INVESTMENT SECURITIES - CONTINUED

          1996                              Gross        Gross                 
       Securities            Amortized    Unrealized   Unrealized              
    Available-for-Sale          Cost        Gains        Losses      Fair Value
    ------------------        --------     --------     --------     ---------- 
    Equity securities         $  3,112     $     --     $     --      $  3,112
    U.S. Treasury                                                             
     securities                 95,861          375         (101)       96,135
    Obligations of U.S.                                                       
     government                                                               
     agencies                   77,456           47         (561)       76,942
    Obligations of states                                                     
     and political                                                            
     subdivision                 4,342           72           (7)        4,407
    Mortgage-backed                                                           
     securities                 66,299          351         (403)       66,247
    Collateral-mortgage                                                       
     obligations                78,740           53       (2,969)       75,824
    Other                          675            1           --           676
                              --------     --------     --------      --------
    Totals                    $326,485     $    899     $ (4,041)     $323,343
                              ========     ========     ========      ========

          1996                              Gross        Gross                 
       Securities            Amortized    Unrealized   Unrealized              
    Held-to-Maturity            Cost        Gains        Losses      Fair Value
    ----------------          --------     --------     --------     ---------- 
    Obligations of states
     and political
     subdivisions             $ 10,659     $    241     $    (20)     $ 10,880
                              ========     ========     ========      ========

                                      F-12
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE B - INVESTMENT SECURITIES - CONTINUED

    The amortized cost and estimated fair value of investment securities at
    December 31, 1997, by contractual maturity, are shown below. Expected
    maturities may differ from contractual maturities because borrowers may have
    the right to call or prepay obligations with or without call or prepayment
    penalties.

                                  Securities                 Securities
                                held-to-maturity          available-for-sale
                            ------------------------    ------------------------
                            Amortized                   Amortized
                               Cost       Fair Value       Cost       Fair Value
                             --------      --------      --------      --------

Due in one year or less      $    590      $    591      $ 72,823      $ 72,625
Due after one year
 through five years             4,512         4,617       119,415       120,120
Due after five years
 through ten years              3,623         3,784         3,520         3,636
Due after ten years             1,728         1,825         2,503         2,512
                             --------      --------      --------      --------
                               10,453        10,817       198,261       198,893
Mortgage-backed
 securities and
 collateral-mortgage
 obligations                       --            --       131,812       131,500
                             --------      --------      --------      --------
                             $ 10,453      $ 10,817      $330,073      $330,393
                             ========      ========      ========      ========

    Proceeds from sales and investment securities during 1997, 1996 and 1995
    approximated $103,253, $129,601 and $117,411, respectively. Net realized
    gains (losses) are as follows:

                                      1997       1996         1995
                                    -------    --------     -------

          Gross realized gains      $   --     $    239     $  280
          Gross realized losses         --       (1,517)      (274)
                                    -------    --------     -------
          Net loss                  $   --     $ (1,278)    $    6
                                    =======    ========     =======

    At December 31, 1997, investment securities having a carrying value of
    approximately $277,641 were pledged to secure public funds on deposit and
    for other purposes required or permitted by law.

                                      F-13
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE C - LOANS RECEIVABLE

    The composition of the Bank's loan portfolio is as follows:

                                                     1997         1996
                                                  ---------     ---------  

         Commercial, financial and agricultural   $  92,987     $  70,825  
         Interim real estate                         12,655        10,766  
         Permanent real estate                      152,128       138,992  
         Consumer loans                              50,299        60,136  
         Foreign loans                               34,139        36,186  
                                                  ---------     ---------  
                                                    342,208       316,905  
         Unearned discount                             (564)       (1,322) 
                                                  ---------     ---------  
                                                    341,644       315,583  
         Reserve for loan losses (note D)            (2,829)       (2,685) 
                                                  ---------     ---------  
                                                                           
         Net Loans                                $ 338,815     $ 312,898  
                                                  =========     =========  

    The following is a schedule of maturities for the Bank's major categories of
    loans as of December 31, 1997:

<TABLE>
<CAPTION>
                                   Year ending December 31,
                       ------------------------------------------------
                         1998      1999      2000      2001      2002   Thereafter   Total
                       --------  --------  --------  --------  --------  --------  --------
<S>                    <C>       <C>       <C>       <C>       <C>       <C>       <C>     
Comercial, financial
 and agricultural      $ 57,675  $  9,974  $ 10,817  $  4,977  $  3,169  $  6,375  $ 92,987
Interim real estate       5,201     1,514       348     2,222     1,342     2,028    12,655
Permanent real estate    28,034    21,545    19,547    26,925    30,011    25,594   151,656
Consumer loans           26,357    11,887     6,352     2,865     1,614     1,132    50,207
Foreign loans            26,697     4,053     1,450       892       748       299    34,139

</TABLE>

                                      F-14
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE C - LOANS RECEIVABLE - CONTINUED

    Loans with a variable and fixed rate of interest are $149,186 and $192,458,
    respectively, as of December 31, 1997.

    The majority of the Bank's loans are concentrated in the South Texas area.

    In the normal course of business, the Bank has made loans to its
    stockholders, directors, officers, employees and their related business
    interests. In the opinion of management, such loans are consistent with
    sound banking practices and are within applicable regulatory lending
    limitations. The outstanding balance of such loans totaled approximately
    $38,608 and $36,628 at December 31, 1997 and 1996, respectively.

    Impairment of loans having recorded investments of $3,030 at December 31,
    1997 and $2,956 at December 31, 1996 has been recognized in conformity with
    FASB Statement No. 114, as amended by FASB Statement No. 118. The average
    recorded investment in impaired loans during 1997 and 1996 was $3,262 and
    $4,181, respectively. The total allowance for loan losses related to these
    loans was $147 and $178 at December 31, 1997 and 1996, respectively.


    Loans pledged as collateral for Federal Reserve borrowings at December 31,
    1997 and 1996 were $8,394 and $10,709, respectively.


NOTE D - RESERVE FOR LOAN LOSSES

    Transactions in the reserve for loan losses are summarized as follows:

                                               1997        1996        1995   
                                             -------     -------     -------  
          Balance - beginning of year        $ 2,685     $ 4,894     $ 5,289
          Provisions charged to operating                                     
           expenses                              845         263         100  
          Loans charged off                   (1,118)     (2,709)       (797) 
          Recoveries on loans previously                                      
           charged off                           417         237         302  
                                             -------     -------     -------
          Balance - end of year              $ 2,829     $ 2,685     $ 4,894
                                             =======     =======     =======
                                                                              

                                      F-15
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE E - BANK PREMISES AND EQUIPMENT

   Bank premises and equipment are summarized as follows:


                                           1997      1996        
                                         -------   -------   
          Banking houses..............   $34,667   $34,286

          Furniture and equipment.....     7,391     6,482
                                         -------   -------
                                          42,058    40,768
          Less accumulated 
           depreciation...............    11,764     9,326
                                         -------   -------
                                          30,294    31,442
          Land (including $3,801 for 
           future development)........     9,729     9,661
                                         -------   -------
                                         $40,023   $41,103
                                         =======   =======

   The following is a schedule by years of future minimum rentals receivable on
non-cancelable operating leases as of December 31, 1997.

       Year ending December 31,      
       ------------------------
             1998                     1,745
             1999                     1,309
             2000                       790
             2001                       256
             2002                       178
          Thereafter                     28
                                     ------
                                     $4,306
                                     ======

   Rental income totaled $1,918, $1,993 and $1,878 for the years ended December
31, 1997, 1996 and 1995, respectively.

   In accordance with Statement of Financial Accounting Standards No. 121,
"Accounting for the Impairment of Long-Live Assets and for Long-Lived Assets to
be Disposed of" (FASB 121), the Bank is required to review long-lived assets and
certain identifiable intangibles for impairment whenever events or changes in
circumstances indicate that the carrying amount of an asset may not be
recoverable. If it is determined that an impairment has occurred, the amount of
the impairment will be charged to operations.

                                      F-16
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE F - OTHER REAL ESTATE OWNED

   Other real estate owned is comprised of property to which the Bank has
obtained title, through foreclosure, in lieu of payment of debts. At
acquisition, these properties are valued at the lower of estimated fair value or
the unpaid principal, accrued interest and other acquisition costs on the
related loans. Any resulting loss at that time is charged to the reserve for
loan losses.

NOTE G - INCOME TAXES

   The income tax provision (benefit) is as follows for the year ended December
31,:


                                                 1997      1996      1995  
                                                ------    ------    ------    
Current                                         $3,103    $3,436    $3,895
Deferred                                           261      (899)     (117)
                                                ------    ------    ------
                                                $3,364    $2,537    $3,778 
                                                ======    ======    ======

                                                 1997      1996      1995  
                                                ------    ------    ------    
Tax at statutory rates                          $3,808    $3,613    $4,120
Increase (reduction) in tax resulting from:  
     Tax exempt interest                          (236)     (237)     (190) 
     Other                                         (44)     (655)       32 
     Nontaxable purchase discount accretion       (164)     (184)     (184)
                                                ------    ------    ------
                                                $3,364    $2,537    $3,778
                                                ======    ======    ======

                                      F-17
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE G - INCOME TAXES - CONTINUED

  Deferred tax assets and liabilities consist of the following at December 31,:


<TABLE>
<CAPTION>
                                            1997                        1996                        1995            
                                -------------------------   -------------------------   -------------------------
                                  Assets      Liabilities     Assets      Liabilities     Assets      Liabilities      
                                -----------   -----------   -----------   -----------   -----------   -----------   
<S>                             <C>           <C>           <C>           <C>           <C>           <C>           
Depreciation on property and
 equipment                      $       308   $        --   $        91   $        --   $        --   $        67
Bad debt reserve                        962            --           913            --         1,664            --
Discount on purchased loans              --            91            --           316            --           505
Loan origination costs                   --            --            --            --            --           233
Basis in other real estate               51            --            28            --            93            --    
Basis in investment 
 securities                              --           124            --            91            --            82
Goodwill amortization                    --           327            --           314            --           301
Other                                    25            --           754            --            --           403
                                -----------   -----------   -----------   -----------   -----------   -----------
                                      1,346           542         1,786           721         1,757         1,591
Less: valuation allowance                --            --            --            --            --            --
                                -----------   -----------   -----------   -----------   -----------   -----------    
                                $     1,346   $       542   $     1,786   $       721   $     1,757   $     1,591
                                ===========   ===========   ===========   ===========   ===========   ===========

</TABLE>

   Management anticipates full utilization of the deferred tax asset reflected
above; therefore, no valuation allowance has been established.

   An analysis of income tax liabilities (assets) is as follows as of December
31,:


                   1997       1996       1995          
                  -------    -------    -------    
Current           $   145    $   444    $   128
Deferred             (804)    (1,065)      (166)
                  -------    -------    ------- 
                  $  (659)   $  (621)   $   (38) 


   The Internal Revenue Service (IRS) had completed examinations of the Bank's
federal income tax returns for the years 1991 through 1993 and the Bank received
"Notices of Deficiency" for those years. Proposed adjustments to income in the
notices resulted in proposed tax deficiencies of approximately $3,924 plus
interest. The major proposed adjustment to income related to losses resulting
from the sale of certain assets in 1991 and the use of net operating loss
carryforwards in 1992 and 1993 occurring as a result of those losses. The Bank
filed a petition with the United States Tax Court contesting the proposed tax
deficiencies. On February 3, 1997, the United States Tax Court determined that
there were no income tax deficiencies for the taxable years 1991, 1992 and 1993.

                                      F-18
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)



NOTE H - COMMITMENTS AND CONTINGENCIES


   In the normal course of business, the Bank is a party to financial
instruments which are not reflected in the accompanying financial statements.
These financial instruments include commitments to extend credit and standby
letters of credit. Those instruments involve, to varying degrees, elements of
credit and interest rate risk in excess of the amount recognized in the balance
sheet. The Bank evaluates its credit and market risks on each commitment on a
case by case basis and obtains collateral as deemed necessary. Losses are
provided using the same evaluation process as for existing loans as set forth in
note A3. The Bank has reserved $199 in anticipation of possible losses as a
result of existing commitments.

   The Bank's exposure to credit loss in the event of nonperformance by the
other party to the financial instrument for commitments to extend credit and
standby letters of credit is represented by the contractual notional amount of
those instruments. The Bank uses the same credit policies in making commitments
and conditional obligations as it does for on-balance-sheet instruments.

   At December 31, 1997, the Bank had outstanding letters of credit of
approximately $7,307 and outstanding loan commitments of approximately $92,462.

   The following is a schedule by years of future minimum rental payments
required under operating leases that have initial or remaining noncancelable
lease terms in excess of one year as of December 31, 1997.




          Year ending December 31,             
          ------------------------
            1998                      $  244
            1999                         194
            2000                         160
            2001                         119
            2002                         119
          Thereafter                      89
                                      ------
                                      $  925
                                      ======


   Rental expense totaled $256, $235 and $256 for 1997, 1996 and 1995,
respectively.

                                      F-19
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)


NOTE I - STATEMENTS OF CASH FLOWS

  Noncash activity consists of the following:



                                1997       1996       1995          
                               -------    -------    -------    

Acquisition (disposal) of 
 other real estate and 
  other assets acquired 
   through the settlement      
    of loans                   $   782    $  (167)   $     -

Net unrealized gain 
 (loss) on available for 
  sale securities, net of 
   deferred taxes 
    (benefit) of $1,177 
     and $(1,092)                2,286     (2,118)    10,734 


  Cash paid for interest and taxes is summarized as follows:





                 1997      1996      1995        
                -------   -------   -------   
  Interest      $27,648   $26,431   $24,870
  Taxes           3,401     3,120     4,258
                -------   -------   -------   
    Total       $31,049   $29,551   $29,128
                =======   =======   =======


NOTE J - REGULATORY CAPITAL MATTERS

   The Bank is subject to various regulatory capital requirements administered
by the federal banking agencies. Failure to meet minimum capital requirements
can initiate certain mandatory and possibly additional discretionary actions by
regulators that, if undertaken, could have a direct material effect on the
Bank's financial statements. Under capital adequacy guidelines and the
regulatory framework for prompt corrective action, the Bank must meet specific
capital guidelines that involve quantitative measures of the Bank's assets,
liabilities, and certain off-balance-sheet items as calculated under regulatory
accounting practices. The Bank's capital amounts and classification are also
subject to qualitative judgments by the regulators about components, risk
weightings, and other factors.

   Quantitative measures established by regulation to ensure capital adequacy
require the Bank to maintain minimum amounts and ratios (set forth in the table
below) of total and Tier I capital (as defined in the regulations) to risk-
weighted assets (as defined in the regulations), and of Tier I capital (as
defined in the regulations) to average assets (as defined in the regulations).
As of December 31, 1997, management believes that the Bank meets all capital
adequacy requirements to which it is subject.

                                      F-20
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)

NOTE J - REGULATORY CAPITAL MATTERS - CONTINUED

     As of December 31, 1997, the most recent notification from the Office of
     the Comptroller of the Currency categorized the Bank as well capitalized
     under the regulatory framework for prompt corrective action. To be
     categorized as well capitalized the Bank must maintain minimum total
     risk-based, Tier I risk-based, and Tier I leverage ratios as set forth in
     the table. There are no conditions or events since that notification that
     management believes have changed the Bank's category.

     The Bank's actual capital amounts and ratios are also presented in the
     table.

<TABLE>
<CAPTION>
                                                                                  To Be Well     
                                                                               Capitalized Under 
                                                          For Capital          Prompt Corrective 
                                       Actual          Adequacy Purposes       Action Provisions 
                                ------------------    -------------------     ------------------ 
                                Amount      Ratio      Amount      Ratio       Amount      Ratio         
                                -------    -------    --------    -------     --------    -------    
<S>                             <C>        <C>        <C>         <C>         <C>         <C>        
As of December 31, 1997:     
  Total Capital (to Risk 
   Weighted Assets)........     $81,960     19.3%     $34,004*     8.0%*      $42,505*     10.0%* 
  Tier I Capital (to Risk                                                  
   Weighted Assets)........     $79,131     18.6%     $17,002*     4.0%*      $25,503*      6.0%* 
  Tier I Capital (to                                                       
   Average Assets).........     $79,131      9.6%     $33,115*     4.0%*      $41,394*      5.0%* 
As of December 31, 1996:                                                   
  Total Capital (to Risk                                                   
   Weighted Assets)........     $73,687     18.6%     $31,651*     8.0%*      $39,564*     10.0%* 
  Tier I Capital (to Risk                                                  
   Weighted Assets)........     $71,002     17.9%     $15,826*     4.0%*      $23,739*      6.0%* 
  Tier I Capital (to                                                       
   Average Assets).........     $71,002      8.8%     $32,439*     4.0%*      $40,548*      5.0%* 

- -----------------
*Greater than or equal to

</TABLE>

                                      F-21
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)

NOTE K - INTEREST INCOME

     A summary of the major components of interest income and other income
     follows:

     Interest Income                  1997      1996      1995  
     ---------------                 -------   -------   -------
     Interest and fees on loans...   $30,940   $29,101   $31,163
     Interest on federal funds 
      sold........................     3,572     2,848     2,624
     Interest on investment 
      securities..................    20,770    22,227    20,611
     Interest on due from banks-
      time........................         6       142        16
                                     -------   -------   -------
                                     $55,288   $54,318   $54,414
                                     =======   =======   =======

     Other Income                     1997      1996       1995 
     ------------                    -------   -------   -------
     Trustee fees.................   $ 1,694   $ 1,718   $ 1,553 
     Capital market fees..........       182       321       231
     Safe deposit fees............       169       176       177
     ATM interchange fees.........        71        72        99
     Official checks..............        56        64        71
     Wire transfer fees...........       150       128       167
     Merchant discounts and other 
      commissions.................        69        80       140
     Foreign currency gain........       113       123       486
     Gain on purchased assets.....        27        89       224
     Other........................       265       305       257
                                     -------   -------   -------
                                     $ 2,796   $ 3,076   $ 3,405
                                     =======   =======   =======

NOTE L - DEFINED CONTRIBUTION RETIREMENT PLAN

     The Bank has established a defined contribution retirement plan (Plan)
     covering substantially all employees. Participants may make voluntary
     salary reduction contributions to the Plan ranging from two to fifteen
     percent of their compensation.

     The Bank's contribution to the Plan is discretionary and is allocated to
     participating employees based upon a formula that provides a 50% matching
     of employee contributions up to five percent of an employee's compensation.
     The balance of the Bank's contribution is allocated to participants based
     on salaries. The Bank contributed $133 and $127 to the Plan in 1997 and
     1996, respectively.

     Plan funds are currently invested in money market accounts. Payments upon
     termination of employment are based on vested amounts credited to
     individual accounts.

     The Bank has obtained a ruling from the Internal Revenue Service confirming
     that the Plan qualifies for special tax treatment under Section 401 of the
     Internal Revenue Code of 1986.

                                      F-22
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)

NOTE M - INTEREST-BEARING DEPOSITS

     Interest-bearing deposits are summarized as follows:

                                           1997       1996  
                                         --------   --------
          NOW and super NOW accounts..   $ 78,118   $ 72,819
          Money market accounts.......     75,640     70,444
          Savings deposits............     42,116     43,866
          Certificates of deposit 
           less than $100,000.........    136,636    132,888
          Certificates of deposit and 
           state time deposits of 
            $100,000 or more..........    254,555    234,251
          Individual retirement 
           accounts...................     17,874     18,784
                                         --------   --------
                                         $604,939   $573,052
                                         ========   ========

          Year ending December 31,           
          ------------------------
                    1998..................   $374,784
                    1999..................      7,650
                    2000..................      3,176
                    2001..................      2,114
                    2002..................      3,247
                   Thereafter.............        220
                                             --------
                                             $391,191
                                             ========

NOTE N - INTEREST EXPENSE

     A summary of the major components of interest expense follows:

                                    1997         1996        1995  
                                   -------      -------     -------
     NOW and super NOW accounts..  $ 1,536      $ 1,624     $ 2,472
     Money Market accounts.......    1,999        1,802       1,944
     Savings Deposits............    1,184        1,258       1,415
     Certificates of Deposit                               
      less than $100,000.........    6,425        6,046       5,819
     Certificates of deposit and                           
      state time deposits of                               
       $100,00 or more...........   11,810       12,450      11,062
     Individual retirement                                 
      accounts...................    1,001        1,119       1,208
     Federal funds purchased and                           
      securities sold under                                
       agreements to repurchase..    3,765        2,454       2,395
                                   -------      -------     -------
                                   $27,720      $26,753     $26,315
                                   =======      =======     =======

                                      F-23
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)

NOTE O - SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

     The securities underlying these agreements were as follows as of December
     31,:

                                                      1997       1996  
                                                     -------   --------
          U.S. Treasury Securities...............    $31,285   $ 50,812
          Obligations of U.S. government agencies     46,988     52,039
          Mortgage-backed securities.............      5,386     11,154
          Collateral-mortgage obligations........      3,485      8,698
                                                     -------   --------
                                                     $87,144   $122,703
                                                     =======   ========

     At December 31, 1997, approximately $57,000 of the agreements were term
     agreements and average a matruity of one month and the remainder mature
     overnight. The securities underlying the agreements are held by a third
     party custodian for the Bank. Average balances of securities sold under
     agreements to repurchase approximated $75,000 and $54,000 during 1997 and
     1996, respectively. The maximum amount outstanding at any month end during
     1997 and 1996 approximated $87,000 and $98,000, respectively.

     The Bank requires that the outstanding balance of repurchase agreements be
     collateralized with at least 102% coverage. If volatility becomes abnormal,
     the coverage will be adjusted upward. Collateral coverage for term
     repurchase agreements is at least 103%.

                                      F-24
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)

NOTE P - DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS

     In accordance with Statement of Financial Accounting Standards No. 107
     "Disclosures about fair value of financial institutions" FASB 107, the Bank
     is required to disclose fair values of financial instruments.

     The following methods and assumptions were used to estimate the fair value
     of each class of financial instrument for which it is practicable to
     estimate that value:

     Cash and cash equivalents - for these short-term instruments, the carrying
     amount is a reasonable estimate of fair value.

     Investment securities - fair value equals quoted market price, if
     available; otherwise, fair value is estimated using quoted market prices
     for similar securities.

     Loans - fair value was estimated by discounting the future cash flows using
     the current rates at which similar loans would be made to borrowers with
     similar credit ratings and for the same remaining maturities.

     Deposit liabilities - fair value of demand deposits, savings accounts, and
     certain money market deposits is the amount payable on demand at the
     reporting date. Fair value of fixed-maturity certificates of deposit is
     estimated using the rates currently offered for deposits of similar
     remaining maturity.

     Commitments to extend credit, standby letters of credit, financial
     guarantees written - fair value of commitments is estimated using the fees
     currently charged to enter into similar agreements, taking into account the
     remaining terms of the agreements and the present credit worthiness of the
     counterparties. For fixed-rate loan commitments, fair value also considers
     the difference between current levels of interest rates and the committed
     rates. The fair value of guarantees and letters of credit is based on fees
     currently charged for similar agreements or on the estimated cost to
     terminate them or otherwise settle the obligations with the counterparties
     at the reporting date.

                                      F-25
<PAGE>
 
                      Mercantile Bank, National Association

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                    (amounts in thousands, except share data)

NOTE P - DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - CONTINUED

     The estimated fair values of the Bank's financial instruments are as
     follows:

                                                       1997         
                                             -----------------------
                                             Carrying               
                                              Amount      Fair Value
                                             ---------    ----------
     Financial Assets
       Cash and cash equivalents........     $ 126,859    $ 126,859 
       Investment securities............       344,022      344,386 
       Loans, net.......................       338,815      338,815 
                                             ---------    ----------
                                             $ 809,696    $ 810,060 
                                             =========    ========= 

     Financial Liabilities
       Deposits.........................     $(700,562)   $(700,562)
                                             =========    ========= 

     Unrecognized financial instruments:
       Commitments to extend credit.....     $ (92,462)   $ (92,462)
       Letters of credit................        (7,307)      (7,307)
                                             ---------    ----------
                                             $ (99,769)   $ (99,769)
                                             =========    ========= 

                                                       1996         
                                             -----------------------
                                             Carrying               
                                              Amount      Fair Value
                                             ---------    ----------
     Financial Assets
       Cash and cash equivalents........     $ 132,463    $ 132,463 
       Investment securities............       334,002      334,223 
       Loans, net.......................       312,898      312,898 
                                             ---------    ----------
                                             $ 779,363    $ 779,584 
                                             =========    ========= 
     Financial Liabilities                
       Deposits.........................     $(669,816)   $(669,816)
                                             =========    ========= 
     Unrecognized financial instruments:
       Commitments to extend credit.....     $ (85,859)   $ (85,859)
       Letters of credit................        (4,222)      (4,222)
                                             ---------    ----------
                                             $ (90,081)   $ (90,081)
                                             =========    ========= 

                                      F-26
<PAGE>
 
                                   APPENDIX A

                      AGREEMENT AND PLAN OF REORGANIZATION

                          AGREEMENT AND PLAN OF MERGER
     (Attached as Exhibit A-1 to the Agreement and Plan of Reorganization)
                                        
<PAGE>
 
                                   AGREEMENT
                                      AND
                             PLAN OF REORGANIZATION
                                        


     AGREEMENT AND PLAN OF REORGANIZATION (the "Agreement") entered into as of
the ___ day of October, 1998, by and between MERCANTILE FINANCIAL ENTERPRISES,
INC. ("MERCANTILE"), A DELAWARE CORPORATION, MERCANTILE BANK, NATIONAL
ASSOCIATION ("BANK"), A NATIONAL BANKING ASSOCIATION, AND NORWEST CORPORATION
("NORWEST"), A DELAWARE CORPORATION.

     WHEREAS, the parties hereto desire to effect a reorganization whereby a
wholly-owned subsidiary of Norwest will merge with and into Mercantile (the
"Merger") pursuant to an agreement and plan of merger (the "Merger Agreement")
in substantially the form attached hereto as Exhibit A-1, which provides, among
other things, for the exchange of the shares of Common Stock of Mercantile of
the par value of $1.00 per share ("Mercantile Common Stock") outstanding
immediately prior to the time the Merger becomes effective in accordance with
the provisions of the Merger Agreement for shares of voting Common Stock of
Norwest of the par value of $1-2/3 per share ("Norwest Common Stock");

     WHEREAS, Norwest desires that, immediately following the Merger, Norwest
will contribute its newly formed, wholly-owned bank subsidiary ("Norwest Bank")
to Mercantile and, immediately thereafter, Norwest Bank will merge with the Bank
under the charter of the Bank (the "Consolidation") pursuant to an agreement of
consolidation (the "Consolidation Agreement") in substantially the form attached
hereto as Exhibit A-2, which provides, among other things, for the exchange of
the shares of voting common stock of the Bank, of the par value of $1.00 per
share, outstanding immediately prior to the time the Consolidation becomes
effective in accordance with the provisions of the Consolidation Agreement and
owned by shareholders other than Mercantile ("Bank Common Stock") for shares of
Norwest Common Stock; and

     WHEREAS, the Merger Agreement and Consolidation Agreement are hereafter
sometimes referred to collectively as the "Transaction Agreements" and the
Merger and Consolidation are hereafter sometimes referred to collectively as the
"Transactions."

     NOW, THEREFORE, to effect such reorganization and in consideration of the
premises and the mutual covenants and agreements contained herein, the parties
hereto do hereby represent, warrant, covenant and agree as follows:

                                      A-1
<PAGE>
 
     1.  Basic Plan of Reorganization

     (a)  Transaction.

          (i)  Merger.  Subject to the terms and conditions contained herein, a
     wholly-owned subsidiary of Norwest will merge with and into Mercantile
     pursuant to the Merger Agreement, with Mercantile as the surviving
     corporation, in which merger each share of Mercantile Common Stock
     outstanding immediately prior to the Effective Time of the Merger (defined
     below) (other than shares as to which statutory dissenters' appraisal
     rights have been exercised) will be converted into and exchanged for a
     number of shares of Norwest Common Stock determined as follows

     (A)  If the Norwest Measurement Price (as defined below) is equal to or
          less than $37.00, the number of shares of Norwest Common Stock will be
          determined by (i) dividing the Merger Value (defined below) by $37.00,
          and (ii) dividing the result of thereof by the total number of shares
          of Mercantile Common Stock then outstanding.

     (B)  If the Norwest Measurement Price is between $37.00 and $41.00, the
          number of shares of Norwest Common Stock will be determined by (i)
          dividing the Merger Value by the Norwest Measurement Price, and (ii)
          dividing the result thereof by the total number of shares of
          Mercantile Common Stock then outstanding.

     (C)  If the Norwest Measurement Price is equal to or greater than $41.00,
          the number of shares of Norwest Common Stock will be determined by (i)
          dividing the Merger Value by $41.00, and (ii) dividing the result
          thereof by the total number of shares of Mercantile Common Stock then
          outstanding.

          (ii)  Consolidation.  Following the Effective Time of the Merger and
     subject to the terms and conditions contained herein, Norwest will
     contribute Norwest Bank to Mercantile and, immediately thereafter, Norwest
     Bank will consolidate with Bank under the charter of Bank  pursuant to the
     Consolidation Agreement, in which Consolidation each share of Bank Common
     Stock outstanding immediately prior to the Effective Time of the
     Consolidation (defined below) (other than shares as to which statutory
     dissenters' appraisal rights have been exercised and other than shares
     owned by Mercantile) will be converted into and exchanged for a number of
     shares of Norwest Common Stock determined as follows:

                                      A-2
<PAGE>
 
     (A)  If the Norwest Measurement Price (as defined below) is equal to or
          less than $37.00, the number of shares of Norwest Common Stock will be
          determined by (i) dividing the Bank Consolidation Value (defined
          below) by $37.00, and (ii) dividing the result thereof by the total
          number of shares of Bank Common Stock then outstanding held by
          shareholders of the Bank other than Mercantile.

     (B)  If the Norwest Measurement Price is between $37.00 and $41.00, the
          number of shares of Norwest Common Stock will be determined by (i)
          dividing the Bank Consolidation Value by the Norwest Measurement
          Price, and (ii) dividing the result thereof by the total number of
          shares of Bank Common Stock then outstanding held by shareholders of
          the Bank other than Mercantile.

     (C)  If the Norwest Measurement Price is equal to or greater than $41.00,
          the number of shares of Norwest Common Stock will be determined by (i)
          dividing the Bank Consolidation Value by $41.00, and (ii) dividing the
          result thereof by the total number of shares of Bank Common Stock then
          outstanding held by shareholders of the Bank other than Mercantile.

          (iii) The "Norwest Measurement Price" is defined as the average of the
     closing prices of a share of Norwest Common Stock as reported on the
     consolidated tape of the New York Stock Exchange during the period of ten
     (10) trading days ending on the day immediately preceding the meetings of
     the shareholders of Mercantile and the Bank (or the effective dates of any
     consent actions in lieu of meetings) required by paragraph 4(c) of the
     Agreement. The "Merger Value" shall mean $174,000,000 minus the "Bank
     Consolidation Value." The "Bank Consolidation Value" equals the amount
     determined by (i) dividing the "Nominal Value" (as hereinafter defined) by
     2,739,928, and (ii) multiplying the result thereof by 110,551. The "Nominal
     Value" shall mean $174,000,000, plus cash liabilities of Mercantile minus
     the cash assets of Mercantile as shown on Mercantile's statement of
     shareholders equity as of the month end immediately preceding the closing
     date, prepared in accordance with generally accepted accounting principles
     applied on a consistent basis.

     (c)  Norwest Common Stock Adjustments.  If, between the date hereof and the
Effective Time of the Merger or the Effective Time of the Consolidation (the
"Effective Times"), shares of Norwest Common Stock shall be changed into a
different number of shares or a different class of shares by reason of any
reclassification, recapitalization, split-up, combination, exchange of shares or
readjustment, or if a stock dividend thereon shall be declared with a record
date within such period (a "Common Stock Adjustment"), then the number of shares
of Norwest Common Stock into which a share of Mercantile Common Stock or Bank
Common Stock shall be converted pursuant to subparagraph 

                                      A-3
<PAGE>
 
(a)(i) or (ii), above, will be appropriately and proportionately adjusted so
that the number of such shares of Norwest Common Stock into which a share of
Mercantile Common Stock or Bank Common Stock shall be converted will equal the
number of shares of Norwest Common Stock which holders of shares of Mercantile
Common Stock or Bank Common Stock would have received pursuant to such Common
Stock Adjustment had the record date therefor been immediately following the
Effective Times.

     (d)  Fractional Shares.  No fractional shares of Norwest Common Stock and
no certificates or scrip certificates therefor shall be issued to represent any
such fractional interest, and any holder thereof shall be paid an amount of cash
equal to the product obtained by multiplying the fractional share interest to
which such holder is entitled by the average of the closing prices of a share of
Norwest Common Stock as reported by the consolidated tape of the New York Stock
Exchange for each of the five (5) trading days ending on the day immediately
preceding the Closing Date.

     (e)  Mechanics of Closing the Transaction.  Subject to the terms and
conditions set forth herein:

          (i) The Merger Agreement shall be executed and it or Articles of
     Merger or a Certificate of Merger shall be filed with the Secretary of
     State of the State of Delaware within ten (10) business days following the
     satisfaction or waiver of all conditions precedent set forth in Sections 6
     and 7 of this Agreement or on such other date as may be agreed to by the
     parties (the "Closing Date").  Each of the parties agrees to use its best
     efforts to cause the Merger to be completed as soon as practicable after
     the receipt of final regulatory approval of the Merger and the expiration
     of all required waiting periods.  The time that the filing referred to in
     the first sentence of this paragraph is made is herein referred to as the
     "Time of Filing."  The day on which such filing is made and accepted is
     herein referred to as the "Effective Date of the Merger."  The "Effective
     Time of the Merger" shall be 11:59 p.m. Wilmington, Delaware time on the
     Effective Date of the Merger.  At the Effective Time of the Merger on the
     Effective Date of the Merger, the separate existence of Merger Co. shall
     cease and Merger Co. will be merged with and into Mercantile pursuant to
     the Merger Agreement; and

          (ii)  The Consolidation shall become effective at 12:01 a.m. (the
     "Effective Time of the Consolidation") on the date specified in the
     Certificate of Approval of Merger to be issued by the Office of the
     Comptroller of the Currency ("Comptroller"), which date shall be the first
     business day after the Effective Date of the Merger (the "Effective Date of
     the Consolidation").

     The closing of the Transactions contemplated by this Agreement, the Merger
Agreement, and the Consolidation Agreement (the "Closing") shall take place on
the Closing Date and the Effective Date of the Consolidation at the offices of
Norwest, Norwest Center, Sixth and Marquette, Minneapolis, Minnesota.

                                      A-4
<PAGE>
 
     (f)  Payment of Mercantile Indebtedness.  On the first business day
succeeding the Closing Date, Norwest shall cause to be paid in full the
indebtedness from Mercantile in favor of Bank, as described on Schedule 1(f)
("Indebtedness") and to release and deliver to the pledgor thereof all
collateral securing such Indebtedness.

     2.  Representations and Warranties of Mercantile and Bank.  Mercantile (and
Bank, but only as to representations and warranties concerning the Bank)
represent and warrant to Norwest as follows:

     (a)  Organization and Authority.  Mercantile is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware, is duly qualified to do business and is in good standing in all
jurisdictions where its ownership or leasing of property or the conduct of its
business requires it to be so qualified and failure to be so qualified would
have a material adverse effect on Mercantile and the Mercantile Subsidiaries
taken as a whole and has corporate power and authority to own its properties and
assets and to carry on its business as it is now being conducted.  Mercantile is
registered as a bank holding company with the Federal Reserve Board under the
Bank Holding Company Act of 1956, as amended (the "BHC Act").  Mercantile has
furnished Norwest true and correct copies of its articles of incorporation and
by-laws, as amended.

     (b)  Mercantile's Subsidiaries.  Schedule 2(b) sets forth a complete and
correct list of all of Mercantile's subsidiaries as of the date hereof
(individually a "Mercantile Subsidiary" and collectively the "Mercantile
Subsidiaries"), all shares of the outstanding capital stock of each of which,
except as set forth on Schedule 2(b), are owned directly or indirectly by
Mercantile.  No equity security of any Mercantile Subsidiary is or may be
required to be issued by reason of any option, warrant, scrip, preemptive right,
right to subscribe to, call or commitment of any character whatsoever relating
to, or security or right convertible into, shares of any capital stock of such
subsidiary, and there are no contracts, commitments, understandings or
arrangements by which any Mercantile Subsidiary is bound to issue additional
shares of its capital stock, or any option, warrant or right to purchase or
acquire any additional shares of its capital stock.  Subject to 12 U.S.C. (S) 55
(1982) and the Delaware Business Corporation Act, all of such shares so owned by
Mercantile are fully paid and nonassessable and are owned by it free and clear
of any lien, claim, charge, option, encumbrance or agreement with respect
thereto.  Each Mercantile Subsidiary is a corporation or national banking
association duly organized, validly existing, duly qualified to do business and
in good standing under the laws of its jurisdiction of incorporation, and has
corporate power and authority to own or lease its properties and assets and to
carry on its business as it is now being conducted.  Except as set forth on
Schedule 2(b), Mercantile does not own beneficially, directly or indirectly,
more than 5% of any class of equity securities or similar interests of any
corporation, bank, business trust, association or similar organization, and is
not, directly or indirectly, a partner in any partnership or party to any joint
venture.

                                      A-5
<PAGE>
 
     (c)  Capitalization.  The authorized capital stock of Mercantile consists
of 100,000 shares of common stock, $1.00 par value, and the authorized capital
stock of the Bank consisting of 30,000,000 shares of common stock, $1.00 par
value, of which as of the close of business May 31, 1998, 1,000 and 2,739,928
shares were outstanding and no shares were held in the treasury.  The maximum
number of shares of Mercantile Common Stock (assuming for this purpose that
phantom shares and other share-equivalents constitute Mercantile Common Stock)
that would be outstanding as of the Effective Date of the Merger if all options,
warrants, conversion rights and other rights with respect thereto were exercised
is 1,000 and 2,739,928, respectively.  All of the outstanding shares of capital
stock of Mercantile have been duly and validly authorized and issued and are
fully paid and nonassessable.  Except as set forth in Schedule 2(c), there are
no outstanding subscriptions, contracts, conversion privileges, options,
warrants, calls, preemptive rights or other rights obligating Mercantile or any
Mercantile Subsidiary to issue, sell or otherwise dispose of, or to purchase,
redeem or otherwise acquire, any shares of capital stock of Mercantile or any
Mercantile Subsidiary.  Since May 31, 1998, no shares of Mercantile capital
stock have been purchased, redeemed or otherwise acquired, directly or
indirectly, by Mercantile or any Mercantile Subsidiary and no dividends or other
distributions have been declared, set aside, made or paid to the shareholders of
Mercantile.

     (d)  Authorization.  Mercantile and Bank each have the corporate power and
authority to enter into this Agreement, the Merger Agreement, and the
Consolidation Agreement, as applicable, and, subject to any required approvals
of its shareholders, to carry out its respective obligations hereunder and
thereunder.  The execution, delivery, and performance of this Agreement, the
Merger Agreement, and the Consolidation Agreement by Mercantile and Bank, as the
case may be, and the consummation of the Transactions contemplated hereby and
thereby have been duly authorized by the respective Boards of Directors of
Mercantile and Bank.  Subject to such approvals of shareholders and of
government agencies and other governing boards having regulatory authority over
Mercantile and Bank as may be required by statute or regulation, this Agreement
and the Merger Agreement are valid and binding obligations of Mercantile and
Bank, respectively, enforceable against Mercantile and Bank in accordance with
their respective terms, except as enforceability may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium, or similar laws affecting
the rights of creditors and contracting parties generally and except as
enforceability may be subject to general principles of equity.

     Except as set forth on Schedule 2(d), neither the execution, delivery, and
performance by Mercantile and Bank of this Agreement, the Merger Agreement, or
the Consolidation Agreement, as applicable, nor the consummation of the
Transactions contemplated hereby and thereby, nor compliance by Mercantile or
Bank with any of the provisions hereof or thereof, will (i) violate, conflict
with, or result in a breach of any provision of, or constitute a default (or an
event which, with notice or lapse of time or both, would constitute a default)
under, or result in the termination of, or accelerate the performance required
by, or result in a right of termination or acceleration of, or result in 

                                      A-6
<PAGE>
 
the creation of, any lien, security interest, charge or encumbrance upon any of
the properties or assets of Mercantile or any Mercantile Subsidiary under any of
the terms, conditions or provisions of (x) its articles of incorporation or by-
laws or (y) any material note, bond, mortgage, indenture, deed of trust,
license, lease, agreement or other instrument or obligation to which Mercantile
or any Mercantile Subsidiary is a party or by which it may be bound, or to which
Mercantile or any Mercantile Subsidiary or any of the properties or assets of
Mercantile or any Mercantile Subsidiary may be subject, or (ii) subject to
compliance with the statutes and regulations referred to in the next paragraph,
to the best knowledge of Mercantile, violate any judgment, ruling, order, writ,
injunction, decree, statute, rule or regulation applicable to Mercantile or any
Mercantile Subsidiary or any of their respective properties or assets.

     Other than in connection or in compliance with the provisions of the
Securities Act of 1933 and the rules and regulations thereunder (the "Securities
Act"), the Securities Exchange Act of 1934 and the rules and regulations
thereunder (the "Exchange Act"), 12 U.S.C. (S) 21, et seq. (the "National Bank
Act"), 12 U.S.C. (S) 1828 (the "Bank Merger Act"), the securities or blue sky
laws of the various states or filings, consents, reviews, authorizations,
approvals or exemptions required under the BHC Act or the Hart-Scott-Rodino
Antitrust Improvements Act of 1976 ("HSR Act"), and filings required to effect
the Merger under Delaware law and the Consolidation under the laws of the United
States, no notice to, filing with, exemption or review by, or authorization,
consent or approval of, any public body or authority is necessary for the
consummation by Mercantile and Bank of the Transactions contemplated by this
Agreement, the Merger Agreement, and the Consolidation Agreement.

     (e)  Mercantile Financial Statements.  The consolidated balance sheets of
Mercantile and Mercantile's Subsidiaries as of December 31, 1997 and 1996 and
related consolidated statements of earnings and statement of stockholders'
equity for the two (2) years ended December 31, 1997, together with the notes
thereto, certified by Burton, McCumber & Prichard, L.L.P., and the unaudited
consolidated statements of financial condition of Mercantile and Mercantile's
Subsidiaries as of June 30, 1998 and the related unaudited consolidated
statements of income, shareholders' equity and cash flows for the six (6) months
then ended (collectively, the "Mercantile Financial Statements"), have been
prepared in accordance with generally accepted accounting principles applied on
a consistent basis and present fairly (subject, in the case of financial
statements for interim periods, to normal recurring adjustments) the
consolidated financial position of Mercantile and Mercantile's Subsidiaries at
the dates and the consolidated results of operations and cash flows of
Mercantile and Mercantile's Subsidiaries for the periods stated therein.

     (f)  Reports.  Since December 31, 1993, Mercantile and each Mercantile
Subsidiary has filed all reports, registrations and statements, together with
any required amendments thereto, that it was required to file with (i) the
Securities and Exchange Commission (the "SEC"), (ii) the Federal Reserve Board,
(iii) the Federal Deposit Insurance Corporation (the "FDIC"), (iv) the
Comptroller, and (v) any applicable state 

                                      A-7
<PAGE>
 
securities or banking authorities. All such reports and statements filed with
any such regulatory body or authority are collectively referred to herein as the
"Mercantile Reports." As of their respective dates, the Mercantile Reports
complied in all material respects with all the rules and regulations promulgated
by the Federal Reserve Board, the FDIC, the Comptroller and applicable state
securities or banking authorities, as the case may be. Copies of all the
Mercantile Reports have been made available to Norwest by Mercantile.

     (g)  Properties and Leases.  Except as may be reflected in the Mercantile
Financial Statements and except for any lien for current taxes not yet
delinquent, Mercantile and each Mercantile Subsidiary have good title free and
clear of any material liens, claims, charges, options, encumbrances or similar
restrictions to all the real and personal property reflected in Mercantile's
consolidated balance sheet as of June 30, 1998, and all real and personal
property acquired since such date, except such real and personal property as has
been disposed of in the ordinary course of business.  All leases of real
property and all other leases material to Mercantile or any Mercantile
Subsidiary pursuant to which Mercantile or such Mercantile Subsidiary, as
lessee, leases real or personal property, which leases are described on Schedule
2(g), are valid and effective in accordance with their respective terms, and
there is not, under any such lease, any material existing default by Mercantile
or such Mercantile Subsidiary or any event which, with notice or lapse of time
or both, would constitute such a material default.  Substantially all of
Mercantile's and each of Mercantile Subsidiary's buildings and equipment in
regular use have been well maintained and are in good and serviceable condition,
reasonable wear and tear excepted.

     (h)  Taxes.  Each of Mercantile and the Mercantile Subsidiaries has filed
all federal, state, county, local and foreign tax returns, including information
returns, required to be filed by it, and paid all taxes owed by it, including
those with respect to income, withholding, social security, unemployment,
workers compensation, franchise, ad valorem, premium, excise and sales taxes,
and no taxes shown on such returns to be owed by it or assessments received by
it are delinquent.  The federal income tax returns of Mercantile and the
Mercantile Subsidiaries for the fiscal year ended December 31, 1994, and for all
fiscal years prior thereto, are for the purposes of routine audit by the
Internal Revenue Service closed because of the statute of limitations, and no
claims for additional taxes for such fiscal years are pending.  Except only as
set forth on Schedule 2(h), (i) neither Mercantile nor any Mercantile Subsidiary
is a party to any pending action or proceeding, nor is any such action or
proceeding threatened by any governmental authority, for the assessment or
collection of taxes, interest, penalties, assessments or deficiencies and (ii)
no issue has been raised by any federal, state, local or foreign taxing
authority in connection with an audit or examination of the tax returns,
business or properties of Mercantile or any Mercantile Subsidiary which has not
been settled, resolved and fully satisfied.  Each of Mercantile and the
Mercantile Subsidiaries has paid all taxes owed or which it is required to
withhold from amounts owing to employees, creditors or other third parties.  The
consolidated balance sheet as of June 30, 1998, referred to in paragraph 2(e)
hereof, includes adequate provision for all accrued but 

                                      A-8
<PAGE>
 
unpaid federal, state, county, local and foreign taxes, interest, penalties,
assessments or deficiencies of Mercantile and the Mercantile Subsidiaries with
respect to all periods through the date thereof.

     (i)  Absence of Certain Changes.  Since December 31, 1997, there has been
no change in the business, financial condition or results of operations of
Mercantile or any Mercantile Subsidiary, which has had, or may reasonably be
expected to have, a material adverse effect on the business, financial condition
or results of operations of Mercantile and the Mercantile Subsidiaries taken as
a whole.

     (j)  Commitments and Contracts.  Except as set forth on Schedule 2(j),
neither Mercantile nor any Mercantile Subsidiary is a party or subject to any of
the following (whether written or oral, express or implied):

          (i)  any employment contract or understanding (including any
     understandings or obligations with respect to severance or termination pay
     liabilities or fringe benefits) with any present or former officer,
     director, employee or consultant (other than those which are terminable at
     will by Mercantile or such Mercantile Subsidiary);

          (ii)  any plan, contract or understanding providing for any bonus,
     pension, option, deferred compensation, retirement payment, profit sharing
     or similar arrangement with respect to any present or former officer,
     director, employee or consultant;

          (iii)  any labor contract or agreement with any labor union;

          (iv)  any contract not made in the ordinary course of business
     containing covenants which limit the ability of Mercantile or any
     Mercantile Subsidiary to compete in any line of business or with any person
     or which involve any restriction of the geographical area in which, or
     method by which, Mercantile or any Mercantile Subsidiary may carry on its
     business (other than as may be required by law or applicable regulatory
     authorities);

          (v)  any other contract or agreement which is a "material contract"
     within the meaning of Item 601(b)(10) of Regulation S-K; or

          (vi)  any lease with annual rental payments aggregating $10,000 or
     more; or

          (vii)  any agreement or commitment with respect to the Community
     Reinvestment Act with any state or federal bank regulatory authority or any
     other party; or

                                      A-9
<PAGE>
 
          (viii)  any current or past agreement, contract or understanding with
     any current or former director, officer, employee, consultant, financial
     adviser, broker, dealer, or agent providing for any rights of
     indemnification in favor of such person or entity.

     (k)  Litigation and Other Proceedings.  Mercantile has furnished Norwest
copies of (i) all attorney responses to the request of the independent auditors
for Mercantile with respect to loss contingencies as of December 31, 1997 in
connection with the Mercantile financial statements, and (ii) a written list of
legal and regulatory proceedings filed against Mercantile or any Mercantile
Subsidiary since said date.  Neither Mercantile nor any Mercantile Subsidiary is
a party to any pending or, to the best knowledge of Mercantile, threatened,
claim, action, suit, investigation or proceeding, or is subject to any order,
judgment or decree, except for matters which, in the aggregate, will not have,
or cannot reasonably be expected to have, a material adverse effect on the
business, financial condition or results of operations of Mercantile and the
Mercantile Subsidiaries taken as a whole.

     (l)  Insurance.  Mercantile and each Mercantile Subsidiary is presently
insured, and during each of the past five (5) calendar years (or during such
lesser period of time as Mercantile has owned such Mercantile Subsidiary) has
been insured, for reasonable amounts with financially sound and reputable
insurance companies against such risks as companies engaged in a similar
business would, in accordance with good business practice, customarily be
insured and has maintained all insurance required by applicable law and
regulation.

     (m)  Compliance with Laws.  Mercantile and each Mercantile Subsidiary has
all permits, licenses, authorizations, orders and approvals of, and has made all
filings, applications and registrations with, federal, state, local or foreign
governmental or regulatory bodies that are required in order to permit it to own
or lease its properties and assets and to carry on its business as presently
conducted and that are material to the business of Mercantile or such Mercantile
Subsidiary; all such permits, licenses, certificates of authority, orders and
approvals are in full force and effect and, to the best knowledge of Mercantile,
no suspension or cancellation of any of them is threatened; and all such
filings, applications and registrations are current.  The conduct by Mercantile
and each Mercantile Subsidiary of its business and the condition and use of its
properties does not violate or infringe, in any respect material to any such
business, any applicable domestic (federal, state or local) or foreign law,
statute, ordinance, license or regulation.  Neither Mercantile nor any
Mercantile Subsidiary is in default under any order, license, regulation or
demand of any federal, state, municipal or other governmental agency or with
respect to any order, writ, injunction or decree of any court.  Except for
statutory or regulatory restrictions of general application and except as set
forth on Schedule 2(m), no federal, state, municipal or other governmental
authority has placed any restriction on the business or properties of Mercantile
or any Mercantile Subsidiary which reasonably could be expected to have a
material adverse effect on the business or properties of Mercantile and the
Mercantile Subsidiaries taken as a whole.

                                      A-10
<PAGE>
 
     (n)  Labor.  No work stoppage involving Mercantile or any Mercantile
Subsidiary is pending or, to the best knowledge of Mercantile, threatened.
Neither Mercantile nor any Mercantile Subsidiary is involved in, or threatened
with or affected by, any labor dispute, arbitration, lawsuit or administrative
proceeding which could materially and adversely affect the business of
Mercantile or such Mercantile Subsidiary.  Employees of Mercantile and the
Mercantile Subsidiaries are not represented by any labor union nor are any
collective bargaining agreements otherwise in effect with respect to such
employees.

     (o)  Material Interests of Certain Persons.  Except as set forth on
Schedule 2(o), to the best knowledge of Mercantile no officer or director of
Mercantile or any Mercantile Subsidiary, or any "associate" (as such term is
defined in Rule l4a-1 under the Exchange Act) of any such officer or director,
has any interest in any material contract or property (real or personal),
tangible or intangible, used in or pertaining to the business of Mercantile or
any Mercantile Subsidiary.

     Schedule 2(o) sets forth a correct and complete list of any loan from
Mercantile or any Mercantile Subsidiary to any present officer, director,
employee or any associate or related interest of any such person which was
required under Regulation O of the Federal Reserve Board to be approved by or
reported to Mercantile's or such Mercantile Subsidiary's Board of Directors.

     (p)  Mercantile Benefit Plans.

          (i)  The only "employee benefit plans" within the meaning of Section
     3(3) of the Employee Retirement Income Security Act of 1974, as amended
     ("ERISA"), for which Mercantile or any Mercantile Subsidiary acts as the
     plan sponsor as defined in ERISA Section 3(16)(B), and with respect to
     which any liability under ERISA or otherwise exists or may be incurred by
     Mercantile or any Mercantile Subsidiary are those set forth on Schedule
     2(p) (the "Plans").  No Plan is a "multi-employer plan" within the meaning
     of Section 3(37) of ERISA.

          (ii)  Each Plan is and has been in all material respects operated and
     administered in accordance with its provisions and applicable law.  Except
     as set forth on Schedule 2(p), Mercantile or the Mercantile subsidiaries
     have received favorable determination letters from the Internal Revenue
     Service under the provisions of the Tax Reform Act of 1986 ("TRA `86") for
     each of the Plans to which the qualification requirements of Section 401(a)
     of the Internal Revenue Code of 1986, as amended (the "Code"), apply.
     Mercantile knows of no reason that any Plan which is subject to the
     qualification provisions of Section 401(a) of the Code is not "qualified"
     within the meaning of Section 401(a) of the Code and that each related
     trust is not exempt from taxation under Section 501(a) of the Code.

                                      A-11
<PAGE>
 
          (iii)  The present value of all benefits vested and all benefits
     accrued under each Plan which is subject to Title IV of ERISA did not, in
     each case, as determined for purposes of reporting on Schedule B to the
     Annual Report on Form 5500 of each such Plan as of the end of the most
     recent Plan year exceed the value of the assets of the Plan allocable to
     such vested or accrued benefits.

          (iv)  Except as disclosed in Schedule 2(p), and to the best knowledge
     of Mercantile, no Plan or any trust created thereunder, nor any trustee,
     fiduciary or administrator thereof, has engaged in a "prohibited
     transaction," as such term is defined in Section 4975 of the Code or
     Section 406 of ERISA or violated any of the fiduciary standards under Part
     4 of Title I of ERISA which could subject, to the best knowledge of
     Mercantile, such Plan or trust, or any trustee, fiduciary or administrator
     thereof, or any party dealing with any such Plan or trust, to the tax or
     penalty on prohibited transactions imposed by said Section 4975 or would
     result in material liability to Mercantile and the Mercantile Subsidiaries
     taken as a whole.

          (v)  No Plan which is subject to Title IV of ERISA or any trust
     created thereunder has been terminated, nor have there been any "reportable
     events" as that term is defined in Section 4043 of ERISA, with respect to
     any Plan, other than those events which may result from the Transactions
     contemplated by this Agreement, the Merger Agreement, or the Consolidation
     Agreement.

          (vi)  No Plan or any trust created thereunder has incurred any
     "accumulated funding deficiency," as such term is defined in Section 412 of
     the Code (whether or not waived), since the effective date of ERISA.

          (vii)  Except as disclosed in Schedule 2(p), neither the execution and
     delivery of this Agreement, the Merger Agreement, or the Consolidation
     Agreement nor the consummation of the Transactions contemplated hereby and
     thereby will (i) result in any material payment (including, without
     limitation, severance, unemployment compensation, golden parachute or
     otherwise) becoming due to any director or employee or former employee of
     Mercantile or any Mercantile Subsidiary under any Plan or otherwise, (ii)
     materially increase any benefits otherwise payable under any Plan or (iii)
     result in the acceleration of the time of payment or vesting of any such
     benefits to any material extent.

     (q)  Proxy Statement, etc.  None of the information regarding Mercantile
and the Mercantile Subsidiaries supplied or to be supplied by Mercantile and
Bank for inclusion in (i) a Registration Statement on Form S-4 to be filed with
the SEC by Norwest for the purpose of registering the shares of Norwest Common
Stock to be exchanged for shares of Mercantile Common Stock and Bank Common
Stock pursuant to the provisions of the Merger Agreement  and the Consolidation
Agreement (the "Registration Statement"), (ii) the joint proxy statement to be
mailed to Mercantile's and Bank's shareholders in connection with the meetings
(or unanimous consent actions in lieu of meetings) to be 

                                      A-12
<PAGE>
 
called to consider the Transactions (the "Proxy Statement"), and (iii) any other
documents to be filed with the SEC or any regulatory authority in connection
with the Transactions contemplated hereby, by the Merger Agreement, or by the
Consolidation Agreement, will, at the respective times such documents are filed
with the SEC or any regulatory authority and, in the case of the Registration
Statement, when it becomes effective and, with respect to the Proxy Statement,
when mailed, be false or misleading with respect to any material fact, or omit
to state any material fact necessary in order to make the statements therein not
misleading or, in the case of the Proxy Statement or any amendment thereof or
supplement thereto, at the time of the meetings of shareholders (or the
effective dates of any unanimous consent actions in lieu of meetings) referred
to in paragraph 4(c), be false or misleading with respect to any material fact,
or omit to state any material fact necessary to correct any statement in any
earlier communication with respect to the solicitation of any proxy for any such
meeting or consent action.

     (r)  Registration Obligations.  Neither Mercantile nor any Mercantile
Subsidiary is under any obligation, contingent or otherwise, which will survive
the Transaction by reason of any agreement to register any of its securities
under the Securities Act.

     (s)  Brokers and Finders.  Except as described on Schedule 2(s) and except
for Alex Sheshunoff & Co. Investment Banking, neither Mercantile nor any
Mercantile Subsidiary nor any of their respective officers, directors or
employees has employed any broker or finder or incurred any liability for any
financial advisory fees, brokerage fees, commissions or finder's fees, and no
broker or finder has acted directly or indirectly for Mercantile or any
Mercantile Subsidiary in connection with this Agreement and the Merger Agreement
or the Transactions contemplated hereby and thereby.

     (t)  Administration of Trust Accounts.  To the best of Mercantile's and
Bank's knowledge, Mercantile and each Mercantile Subsidiary has properly
administered in all material respects and which could reasonably be expected to
be material to the financial condition of Mercantile and the Mercantile
Subsidiaries taken as a whole all accounts for which it acts as a fiduciary,
including but not limited to accounts for which it serves as a trustee, agent,
custodian, personal representative, guardian, conservator or investment advisor,
in accordance with the terms of the governing documents and applicable state and
federal law and regulation and common law.  To the best of Mercantile's and
Bank's knowledge, neither Mercantile, any Mercantile Subsidiary, nor any
director, officer or employee of Mercantile or any Mercantile Subsidiary has
committed any breach of trust with respect to any such fiduciary account which
is material to or could reasonably be expected to be material to the financial
condition of Mercantile and the Mercantile Subsidiaries taken as a whole, and
the accountings for each such fiduciary account are true and correct in all
material respects and accurately reflect the assets of such fiduciary account.

                                      A-13
<PAGE>
 
     (u)  No Defaults.  Neither Mercantile nor any Mercantile Subsidiary is in
default, nor has any event occurred which, with the passage of time or the
giving of notice, or both, would constitute a default, under any material
agreement, indenture, loan agreement or other instrument to which it is a party
or by which it or any of its assets is bound or to which any of its assets is
subject, the result of which has had or could reasonably be expected to have a
material adverse effect upon Mercantile and the Mercantile Subsidiaries, taken
as a whole.  To the best of Mercantile's and Bank's knowledge, all parties with
whom Mercantile or any Mercantile Subsidiary has material leases, agreements or
contracts or who owe to Mercantile or any Mercantile Subsidiary material
obligations other than with respect to those arising in the ordinary course of
the banking business of the Mercantile Subsidiaries are in compliance therewith
in all material respects.

     (v)  Environmental Liability.  There is no legal, administrative, or other
proceeding, claim, or action of any nature seeking to impose, or that could
result in the imposition of, on Mercantile, any Mercantile Subsidiary, or any
trust for which Bank is acting as trustee, any liability relating to the release
of hazardous substances as defined under any local, state or federal
environmental statute, regulation or ordinance including, without limitation,
the Comprehensive Environmental Response, Compensation and Liability Act of
1980, as amended ("CERCLA"), pending or to the best of Mercantile's knowledge,
threatened against Mercantile, any Mercantile Subsidiary, or any trust for which
Bank is acting as trustee, the result of which has had or could reasonably be
expected to have a material adverse effect upon Mercantile and Mercantile's
Subsidiaries taken as a whole or any trust for which Bank is acting as trustee;
to the best of Mercantile's knowledge there is no reasonable basis for any such
proceeding, claim or action; and to the best of Mercantile's knowledge neither
Mercantile nor any Mercantile Subsidiary is subject to any agreement, order,
judgment, or decree by or with any court, governmental authority or third party
imposing any such environmental liability.  Mercantile has provided Norwest with
copies of all environmental assessments, reports, studies and other related
information in its possession with respect to each bank facility and each non-
residential OREO property and for each trust for which Bank is acting as
trustee.

     (w) Compliance with Year 2000 Requirements.  Except as set forth in
Schedule 2(w), Mercantile is in full compliance with its Year 2000 project
management process as set forth in the May 5, 1997 Federal Financial
Institutions Examination Council ("FFIEC") Interagency Statement on the Year
2000 and subsequent guidance documents (the "FFIEC Requirements").  Mercantile
and Bank have each made its Year 2000 project assessment and remediation plan
available to Norwest for review and have furnished Norwest with copies of all
communications between Mercantile or any Mercantile Subsidiary and regulators
having responsibility for overseeing compliance with such current FFIEC
Requirements.

                                      A-14
<PAGE>
 
     3.  Representations and Warranties of Norwest.  Norwest represents and
warrants to Mercantile and Bank as follows:

     (a)  Organization and Authority.  Norwest is a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware,
is duly qualified to do business and is in good standing in all jurisdictions
where its ownership or leasing of property or the conduct of its business
requires it to be so qualified and failure to be so qualified would have a
material adverse effect on Norwest and its subsidiaries taken as a whole and has
corporate power and authority to own its properties and assets and to carry on
its business as it is now being conducted.  Norwest is registered as a bank
holding company with the Federal Reserve Board under the BHC Act.

     (b)  Norwest Subsidiaries.  Schedule 3(b) sets forth a complete and correct
list as of December 31, 1997, of Norwest's Significant Subsidiaries (as defined
in Regulation S-X promulgated by the SEC) (individually a "Norwest Subsidiary"
and collectively the "Norwest Subsidiaries"), all shares of the outstanding
capital stock of each of which, except as set forth in Schedule 3(b), are owned
directly or indirectly by Norwest.  No equity security of any Norwest Subsidiary
is or may be required to be issued to any person or entity other than Norwest by
reason of any option, warrant, scrip, right to subscribe to, call or commitment
of any character whatsoever relating to, or security or right convertible into,
shares of any capital stock of such subsidiary, and there are no contracts,
commitments, understandings or arrangements by which any Norwest Subsidiary is
bound to issue additional shares of its capital stock, or options, warrants or
rights to purchase or acquire any additional shares of its capital stock.
Subject to 12 U.S.C. (S) 55 (1982), all of such shares so owned by Norwest are
fully paid and nonassessable and are owned by it free and clear of any lien,
claim, charge, option, encumbrance or agreement with respect thereto.  Each
Norwest Subsidiary is a corporation or national banking association duly
organized, validly existing, duly qualified to do business and in good standing
under the laws of its jurisdiction of incorporation, and has corporate power and
authority to own or lease its properties and assets and to carry on its business
as it is now being conducted.

     (c)  Norwest Capitalization.  As of June 30, 1998, the authorized capital
stock of Norwest consists of (i) 5,000,000 shares of Preferred Stock, without
par value, of which as of the close of business on June 30, 1998, 980,000 shares
of Cumulative Tracking Preferred Stock, at $200 stated value, 9,890 shares of
ESOP Cumulative Convertible Preferred Stock, at $1,000 stated value, 20,386
shares of 1995 ESOP Cumulative Convertible Preferred Stock, at $1,000 stated
value, 22,458 shares of 1996 ESOP Cumulative Convertible Preferred Stock, at
$1,000 stated value, and 19,982 shares of 1997 ESOP Cumulative Convertible
Preferred Stock, at $1,000 stated value, and 20,636 shares of 1998 ESOP
Cumulative Convertible Preferred Stock, at $1,000 par value, were outstanding;
(ii) 4,000,000 shares of Preference Stock, without par value, of which as of the
close of business on June 30, 1998, no shares were outstanding; and (iii)
2,000,000,000 shares of Common Stock, $1-2/3 par value, of which as of the close
of business on June 30, 1998, 771,113,149 shares were outstanding and 11,502,502
shares 

                                      A-15
<PAGE>
 
were held in the treasury. All of the outstanding shares of capital stock
of Norwest have been duly and validly authorized and issued and are fully paid
and nonassessable.  On June 7, 1998, Norwest entered into an Agreement and Plan
of Merger (the "Wells Merger Agreement") by and between Norwest and Wells Fargo
& Company ("Wells Fargo"), a Delaware corporation, under which it is
contemplated that Wells Fargo will merge with and into a wholly-owned subsidiary
of Norwest, and that Norwest will change its name to "Wells Fargo & Company"
(the "Wells Merger").  The Wells Merger Agreement provides that, prior to
consummation of the Wells Merger, Norwest will amend its Restated Certificate of
Incorporation to provide that Norwest shall have authority to issue an aggregate
of 20,000,000 shares of Preferred Stock without par value, 4,000,000 of
Preference Stock without par value, and 4,000,000,000 shares of Common Stock of
the par value of $1-2/3 per share.

     (d)  Authorization.  Norwest has the corporate power and authority to enter
into this Agreement and to carry out its obligations hereunder.  The execution,
delivery, and performance of this Agreement by Norwest and the consummation of
the Transactions contemplated hereby have been duly authorized by the Board of
Directors of Norwest.  No approval or consent by the stockholders of Norwest is
necessary for the execution and delivery of this Agreement, the Merger
Agreement, and the Consolidation Agreement and the consummation of the
Transactions contemplated hereby and thereby.  Subject to such approvals of
government agencies and other governing boards having regulatory authority over
Norwest as may be required by statute or regulation, this Agreement is a valid
and binding obligation of Norwest enforceable against Norwest in accordance with
its terms, except as enforceability may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium, or similar laws affecting the rights of
creditors and contracting parties generally and except as enforceability may be
subject to general principles of equity.

     Neither the execution, delivery, and performance by Norwest of this
Agreement or the Merger Agreement, nor the execution, delivery, and performance
by Norwest Bank of the Consolidation Agreement, nor the consummation of the
Transactions contemplated hereby and thereby, nor compliance by Norwest with any
of the provisions hereof or thereof, will (i) violate, conflict with, or result
in a breach of any provision of, or constitute a default (or an event which,
with notice or lapse of time or both, would constitute a default) under, or
result in the termination of, or accelerate the performance required by, or
result in a right of termination or acceleration of, or result in the creation
of, any lien, security interest, charge or encumbrance upon any of the
properties or assets of Norwest or any Norwest Subsidiary under any of the
terms, conditions or provisions of (x) its certificate of incorporation or by-
laws or (y) any material note, bond, mortgage, indenture, deed of trust,
license, lease, agreement or other instrument or obligation to which Norwest or
any Norwest Subsidiary is a party or by which it may be bound, or to which
Norwest or any Norwest Subsidiary or any of the properties or assets of Norwest
or any Norwest Subsidiary may be subject, or (ii) subject to compliance with the
statutes and regulations referred to in the next paragraph, to the best
knowledge of Norwest, violate any judgment, ruling, order, writ, injunction,
decree, statute, rule or regulation 

                                      A-16
<PAGE>
 
applicable to Norwest or any Norwest Subsidiary or any of their respective
properties or assets.

     Other than in connection with or in compliance with the provisions of the
Securities Act, the Exchange Act, the National Bank Act, the Bank Merger Act,
the securities or blue sky laws of the various states or filings, consents,
reviews, authorizations, approvals or exemptions required under the BHC Act or
the HSR Act, and filings required to effect the Merger under Delaware law and
the Consolidation under the laws of the United States, no notice to, filing
with, exemption or review by, or authorization, consent or approval of, any
public body or authority is necessary for the consummation by Norwest of the
Transactions contemplated by this Agreement, the Merger Agreement, and the
Consolidation Agreement.

     (e)  Norwest Financial Statements.  The consolidated balance sheets of
Norwest and Norwest's subsidiaries as of December 31, 1997 and 1996 and related
consolidated statements of income, stockholders' equity and cash flows for the
three (3) years ended December 31, 1997, together with the notes thereto,
certified by KPMG Peat Marwick and included in Norwest's Annual Report on Form
10-K for the fiscal year ended December 31, 1997 (the "Norwest 10-K") as filed
with the SEC, and the unaudited consolidated balance sheets of Norwest and its
subsidiaries as of June 30, 1998 and the related unaudited consolidated
statements of income and cash flows for the six (6) months then ended included
in Norwest's Quarterly Report on Form 10-Q for the fiscal quarter ended June 30,
1998, as filed with the SEC (collectively, the "Norwest Financial Statements"),
have been prepared in accordance with generally accepted accounting principles
applied on a consistent basis and present fairly (subject, in the case of
financial statements for interim periods, to normal recurring adjustments) the
consolidated financial position of Norwest and its subsidiaries at the dates and
the consolidated results of operations, changes in financial position and cash
flows of Norwest and its subsidiaries for the periods stated therein.

     (f)  Reports.  Since December 31, 1993, Norwest and each Norwest Subsidiary
has filed all reports, registrations and statements, together with any required
amendments thereto, that it was required to file with (i) the SEC, including,
but not limited to, Forms 10-K, Forms 10-Q and proxy statements, (ii) the
Federal Reserve Board, (iii) the FDIC, (iv) the Comptroller and (v) any
applicable state securities or banking authorities.  All such reports and
statements filed with any such regulatory body or authority are collectively
referred to herein as the "Norwest Reports."  As of their respective dates, the
Norwest Reports complied in all material respects with all the rules and
regulations promulgated by the SEC, the Federal Reserve Board, the FDIC, the
Comptroller and any applicable state securities or banking authorities, as the
case may be, and the Norwest Reports filed with the SEC did not contain any
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary in order to make the statements therein, in light
of the circumstances under which they were made, not misleading.

                                      A-17
<PAGE>
 
     (g)  Properties and Leases.  Except as may be reflected in the Norwest
Financial Statements and except for any lien for current taxes not yet
delinquent, Norwest and each Norwest Subsidiary has good title free and clear of
any material liens, claims, charges, options, encumbrances or similar
restrictions to all the real and personal property reflected in Norwest's
consolidated balance sheet as of June 30, 1998 included in Norwest's Quarterly
Report on Form 10-Q for the period then ended, and all real and personal
property acquired since such date, except such real and personal property has
been disposed of in the ordinary course of business.  All leases of real
property and all other leases material to Norwest or any Norwest Subsidiary
pursuant to which Norwest or such Norwest Subsidiary, as lessee, leases real or
personal property, are valid and effective in accordance with their respective
terms, and there is not, under any such lease, any material existing default by
Norwest or such Norwest Subsidiary or any event which, with notice or lapse of
time or both, would constitute such a material default.  Substantially all
Norwest's and each Norwest Subsidiary's buildings and equipment in regular use
have been well maintained and are in good and serviceable condition, reasonable
wear and tear excepted.

     (h)  Taxes.  Each of Norwest and the Norwest Subsidiaries has filed all
material federal, state, county, local and foreign tax returns, including
information returns, required to be filed by it, and paid or made adequate
provision for the payment of all taxes owed by it, including those with respect
to income, withholding, social security, unemployment, workers compensation,
franchise, ad valorem, premium, excise and sales taxes, and no taxes shown on
such returns to be owed by it or assessments received by it are delinquent.  The
federal income tax returns of Norwest and the Norwest Subsidiaries for the
fiscal year ended December 31, 1982, and for all fiscal years prior thereto, are
for the purposes of routine audit by the Internal Revenue Service closed because
of the statute of limitations, and no claims for additional taxes for such
fiscal years are pending.  Except only as set forth on Schedule 3(h), (i)
neither Norwest nor any Norwest Subsidiary is a party to any pending action or
proceeding, nor to Norwest's knowledge is any such action or proceeding
threatened by any governmental authority, for the assessment or collection of
taxes, interest, penalties, assessments or deficiencies which could reasonably
be expected to have any material adverse effect on Norwest and its subsidiaries
taken as a whole, and (ii) no issue has been raised by any federal, state, local
or foreign taxing authority in connection with an audit or examination of the
tax returns, business or properties of Norwest or any Norwest Subsidiary which
has not been settled, resolved and fully satisfied, or adequately reserved for.
Each of Norwest and the Norwest Subsidiaries has paid all taxes owed or which it
is required to withhold from amounts owing to employees, creditors or other
third parties.

     (i)  Absence of Certain Changes.  Since December 31, 1997, there has been
no change in the business, financial condition or results of operations of
Norwest or any Norwest Subsidiary which has had, or may reasonably be expected
to have, a material adverse effect on the business, financial condition or
results of operations of Norwest and its subsidiaries taken as a whole.

                                      A-18
<PAGE>
 
     (j)  Commitments and Contracts.  Except as set forth on Schedule 3(j), as
of December 31, 1997 neither Norwest nor any Norwest Subsidiary is a party or
subject to any of the following (whether written or oral, express or implied):

          (i)  any labor contract or agreement with any labor union;

          (ii)  any contract not made in the ordinary course of business
     containing covenants which materially limit the ability of Norwest or any
     Norwest Subsidiary to compete in any line of business or with any person or
     which involve any material restriction of the geographical area in which,
     or method by which, Norwest or any Norwest Subsidiary may carry on its
     business (other than as may be required by law or applicable regulatory
     authorities);

          (iii)  any other contract or agreement which is a "material contract"
     within the meaning of Item 601(b)(10) of Regulation S-K.

     (k)  Litigation and Other Proceedings.  Neither Norwest nor any Norwest
Subsidiary is a party to any pending or, to the best knowledge of Norwest,
threatened, claim, action, suit, investigation or proceeding, or is subject to
any order, judgment or decree, except for matters which, in the aggregate, will
not have, or cannot reasonably be expected to have, a material adverse effect on
the business, financial condition or results of operations of Norwest and its
subsidiaries taken as a whole.

     (l)  Insurance.  Norwest and each Norwest Subsidiary is presently insured
or self-insured, and during each of the past five (5) calendar years (or during
such lesser period of time as Norwest has owned such Norwest Subsidiary) has
been insured or self-insured, for reasonable amounts with financially sound and
reputable insurance companies against such risks as companies engaged in a
similar business would, in accordance with good business practice, customarily
be insured and has maintained all insurance required by applicable law and
regulation.

     (m)  Compliance with Laws.  Norwest and each Norwest Subsidiary has all
permits, licenses, authorizations, orders and approvals of, and has made all
filings, applications and registrations with, federal, state, local or foreign
governmental or regulatory bodies that are required in order to permit it to own
or lease its properties or assets and to carry on its business as presently
conducted and that are material to the business of Norwest or such Subsidiary;
all such permits, licenses, certificates of authority, orders and approvals are
in full force and effect, and to the best knowledge of Norwest, no suspension or
cancellation of any of them is threatened; and all such filings, applications
and registrations are current.  The conduct by Norwest and each Norwest
Subsidiary of its business and the condition and use of its properties does not
violate or infringe, in any respect material to any such business, any
applicable domestic (federal, state or local) or foreign law, statute,
ordinance, license or regulation.  Neither Norwest nor any Norwest Subsidiary is
in default under any order, license, regulation or demand of any federal, state,
municipal or other governmental agency or with respect to any 

                                      A-19
<PAGE>
 
order, writ, injunction or decree of any court. Except for statutory or
regulatory restrictions of general application, no federal, state, municipal or
other governmental authority has placed any restrictions on the business or
properties of Norwest or any Norwest Subsidiary which reasonably could be
expected to have a material adverse effect on the business or properties of
Norwest and its subsidiaries taken as a whole.

     (n)  Labor.  No work stoppage involving Norwest or any Norwest Subsidiary
is pending or, to the best knowledge of Norwest, threatened.  Neither Norwest
nor any Norwest Subsidiary is involved in, or threatened with or affected by,
any labor dispute, arbitration, lawsuit or administrative proceeding which could
materially and adversely affect the business of Norwest or such Norwest
Subsidiary.  Except as set forth on Schedule 3(j), employees of Norwest and the
Norwest Subsidiaries are not represented by any labor union nor are any
collective bargaining agreements otherwise in effect with respect to such
employees.

     (o)  Norwest Benefit Plans.

          (i)  As of December 31, 1997, the only "employee benefit plans" within
     the meaning of Section 3(3) of ERISA for which Norwest or any Norwest
     Subsidiary acts as plan sponsor as defined in ERISA Section 3(16)(B) with
     respect to which any liability under ERISA or otherwise exists or may be
     incurred by Norwest or any Norwest Subsidiary are those set forth on
     Schedule 3(o) (the "Norwest Plans").  No Norwest Plan is a "multi-employer
     plan" within the meaning of Section 3(37) of ERISA.

          (ii)  Each Norwest Plan is and has been in all material respects
     operated and administered in accordance with its provisions and applicable
     law.  Except as set forth on Schedule 3(o), Norwest or the Norwest
     Subsidiaries have received favorable determination letters from the
     Internal Revenue Service under the provisions of TRA `86 for each of the
     Norwest Plans to which the qualification requirements of Section 401(a) of
     the Code apply.  Norwest knows of no reason that any Norwest Plan which is
     subject to the qualification provisions of Section 401(a) of the Code is
     not "qualified" within the meaning of Section 401(a) of the Code and that
     each related trust is not exempt from taxation under Section 501(a) of the
     Code.

          (iii)  The present value of all benefits vested and all benefits
     accrued under each Norwest Plan which is subject to Title IV of ERISA did
     not, in each case, as determined for purposes of reporting on Schedule B to
     the Annual Report on Form 5500 of each such Norwest Plan as of the end of
     the most recent Plan year, exceed the value of the assets of the Norwest
     Plans allocable to such vested or accrued benefits.

                                      A-20
<PAGE>
 
          (iv)  Except as set forth on Schedule 3(o), and to the best knowledge
     of Norwest, no Norwest Plan or any trust created thereunder, nor any
     trustee, fiduciary or administrator thereof, has engaged in a "prohibited
     transaction," as such term is defined in Section 4975 of the Code or
     Section 406 of ERISA or violated fiduciary  standards under Part 4 of Title
     I of ERISA, which could subject, to the best knowledge of Norwest, such
     Norwest Plan or trust, or any trustee, fiduciary or administrator thereof,
     or any party dealing with any such Norwest Plan or trust, to the tax or
     penalty on prohibited transactions imposed by said Section 4975 or would
     result in material liability to Norwest and its subsidiaries taken as a
     whole.

          (v)  Except as set forth on Schedule 3(o), no Norwest Plan which is
     subject to Title IV of ERISA or any trust created thereunder has been
     terminated, nor have there been any "reportable events" as that term is
     defined in Section 4043 of ERISA with respect to any Norwest Plan, other
     than those events which may result from the Transactions contemplated by
     this Agreement, the Merger Agreement, and the Consolidation Agreement.

          (vi)  No Norwest Plan or any trust created thereunder has incurred any
     "accumulated funding deficiency," as such term is defined in Section 412 of
     the Code (whether or not waived), during the last five Norwest Plan years
     which would result in a material liability.

          (vii)  Neither the execution and delivery of this Agreement, the
     Merger Agreement, or the Consolidation Agreement, nor the consummation of
     the Transactions contemplated hereby and thereby will (i) result in any
     material payment (including, without limitation, severance, unemployment
     compensation, golden parachute or otherwise) becoming due to any director
     or employee or former employee of Norwest under any Norwest Plan or
     otherwise, (ii) materially increase any benefits otherwise payable under
     any Norwest Plan or (iii) result in the acceleration of the time of payment
     or vesting of any such benefits to any material extent.

     (p)  Registration Statement, etc.  None of the information regarding
Norwest and the Norwest Subsidiaries supplied or to be supplied by Norwest for
inclusion in (i) the Registration Statement, (ii) the Proxy Statement, or (iii)
any other documents to be filed with the SEC or any regulatory authority in
connection with the transactions contemplated hereby or by the Merger Agreement,
or the Consolidation Agreement will, at the respective times such documents are
filed with the SEC or any regulatory authority and, in the case of the
Registration Statement, when it becomes effective and, with respect to the Proxy
Statement, when mailed, be false or misleading with respect to any material
fact, or omit to state any material fact necessary in order to make the
statements therein not misleading or, in the case of the Proxy Statement or any
amendment thereof or supplement thereto, at the time of the meeting of
shareholders (or the effective dates of any unanimous consent actions in lieu of
meetings) referred to in paragraph 4(c), be false 

                                      A-21
<PAGE>
 
or misleading with respect to any material fact, or omit to state any material
fact necessary to correct any statement in any earlier communication with
respect to the solicitation of any proxy for such meeting or consent action. All
documents which Norwest and the Norwest Subsidiaries are responsible for filing
with the SEC and any other regulatory authority in connection with the Merger
and the Consolidation will comply as to form in all material respects with the
provisions of applicable law.

     (q)  Brokers and Finders.  Neither Norwest nor any Norwest Subsidiary nor
any of their respective officers, directors or employees has employed any broker
or finder or incurred any liability for any financial advisory fees, brokerage
fees, commissions or finder's fees, and no broker or finder has acted directly
or indirectly for Norwest or any Norwest Subsidiary in connection with this
Agreement, the Merger Agreement, and the Consolidation Agreement or the
Transactions contemplated hereby and thereby.

     (r)  No Defaults.  Neither Norwest nor any Norwest Subsidiary is in
default, nor has any event occurred which, with the passage of time or the
giving of notice, or both, would constitute a default under any material
agreement, indenture, loan agreement or other instrument to which it is a party
or by which it or any of its assets is bound or to which any of its assets is
subject, the result of which has had or could reasonably be expected to have a
material adverse effect upon Norwest and its subsidiaries taken as a whole.  To
the best of Norwest's knowledge, all parties with whom Norwest or any Norwest
Subsidiary has material leases, agreements or contracts or who owe to Norwest or
any Norwest Subsidiary material obligations other than with respect to those
arising in the ordinary course of the banking business of the Norwest
Subsidiaries are in compliance therewith in all material respects.

     (s)  Environmental Liability.  There is no legal, administrative, or other
proceeding, claim, or action of any nature seeking to impose, or that could
result in the imposition, on Norwest or any Norwest Subsidiary of any liability
relating to the release of hazardous substances as defined under any local,
state or federal environmental statute, regulation or ordinance including,
without limitation, CERCLA, pending or to the best of Norwest's knowledge,
threatened against Norwest or any Norwest Subsidiary, the result of which has
had or could reasonably be expected to have a material adverse effect upon
Norwest and its subsidiaries taken as a whole; to the best of Norwest's
knowledge there is no reasonable basis for any such proceeding, claim or action;
and to the best of Norwest's knowledge neither Norwest nor any Norwest
Subsidiary is subject to any agreement, order, judgment, or decree by or with
any court, governmental authority or third party imposing any such environmental
liability.

     (t)  Merger Co.  As of the Closing Date, Merger Co. will be a corporation
duly organized, validly existing, duly qualified to do business, and in good
standing under the laws of its jurisdiction of incorporation, and will have
corporate power and authority to own or lease its properties and assets and to
carry on its business.  As of the Effective Date of the Merger, the execution,
delivery, and performance by Merger Co. of the Merger Agreement will have been
duly authorized by the Board of Directors and 

                                      A-22
<PAGE>
 
shareholders of Merger Co. and the Merger Agreement will be a valid and binding
obligation of Merger Co. enforceable against Merger Co. in accordance with its
terms, except as enforceability may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium, or similar laws affecting the rights of
creditors and contracting parties generally and except as enforceability may be
subject to general principles of equity.

     (u)  Norwest Bank.  As of the Effective Date of the Consolidation, Norwest
Bank will be a national banking association duly organized, validly existing,
duly qualified to do business, and in good standing under the laws of the United
States, and will have corporate power and authority to own or lease its
properties and assets and to carry on its business.  As of the Effective Date of
the Consolidation, the execution, delivery, and performance by Norwest Bank of
the Consolidation Agreement will have been duly authorized by the Board of
Directors and shareholders of Norwest Bank and the Consolidation Agreement will
be a valid and binding obligation of Norwest Bank enforceable against Norwest
Bank in accordance with its terms, except as enforceability may be limited by
applicable bankruptcy, insolvency, reorganization, moratorium, or similar laws
affecting the rights of creditors and contracting parties generally and except
as enforceability may be subject to general principles of equity.

     (u)  Year 2000.  None of Norwest or any of the Norwest Subsidiaries has
received, or reasonably expects to receive, a "Year 2000 Deficiency Notification
Letter" (as such term is employed in the Federal Reserve's Supervision and
Regulation Letter No. SR 98-3 (SUP), dated March 4, 1998).

     4.  Covenants of Mercantile and Bank.  Mercantile and Bank (to the extent a
covenant or agreement applies to Bank) covenants and agrees with Norwest as
follows:

     (a)  Except as otherwise permitted or required by this Agreement, from the
date hereof until the Effective Time of the Merger, Mercantile, and each
Mercantile Subsidiary will:  maintain its corporate existence in good standing;
maintain the general character of its business and conduct its business in its
ordinary and usual manner; extend credit in accordance with existing lending
policies, except that it shall not, without the prior written consent of Norwest
(such consent to be deemed given if Norwest does not respond within two (2)
business days of receiving notice from Mercantile), make any new loan or modify,
restructure or renew any existing loan (except pursuant to commitments made
prior to the date of this Agreement) to any borrower if the amount of the
resulting loan, when aggregated with all other loans or extensions of credit to
such person, would be in excess of $1,000,000; maintain proper business and
accounting records in accordance with generally accepted principles; maintain
its properties in good repair and condition, ordinary wear and tear excepted;
maintain in all material respects presently existing insurance coverage; use its
best efforts to preserve its business organization intact, to keep the services
of its present principal employees and to preserve its good will and the good
will of its suppliers, customers and others having business relationships with
it; use its best efforts to obtain any approvals or consents required to
maintain 

                                      A-23
<PAGE>
 
existing leases and other contracts in effect following the Merger; comply in
all material respects with all laws, regulations, ordinances, codes, orders,
licenses and permits applicable to the properties and operations of Mercantile
and each Mercantile Subsidiary the non-compliance with which reasonably could be
expected to have a material adverse effect on Mercantile and the Mercantile
Subsidiaries taken as a whole; promptly upon request provide access to Norwest
and its representatives of Mercantile or Mercantile's Subsidiaries' bank
application computer files and provide or cause to be provided any vendor
deconversion tape from Electronic Data Systems Corporation; and permit Norwest
and its representatives (including KPMG Peat Marwick) to examine its and its
subsidiaries books, records and properties and to interview officers, employees
and agents at all reasonable times when it is open for business. No such
examination by Norwest or its representatives either before or after the date of
this Agreement shall in any way affect, diminish or terminate any of the
representations, warranties or covenants of Mercantile herein expressed.

     (b)  Except as otherwise contemplated or required by this Agreement, from
the date hereof until the Effective Time of the Merger, Mercantile and each
Mercantile subsidiary will not (without the prior written consent of Norwest):
amend or otherwise change its articles of incorporation or association or by-
laws; issue or sell or authorize for issuance or sale, or grant any options or
make other agreements with respect to the issuance or sale or conversion of, any
shares of its capital stock, phantom shares or other share-equivalents, or any
other of its securities; authorize or incur any long-term debt (other than
deposit liabilities); mortgage, pledge or subject to lien or other encumbrance
any of its properties, except in the ordinary course of business; enter into any
material agreement, contract or commitment in excess of $10,000 except banking
transactions in the ordinary course of business and in accordance with policies
and procedures in effect on the date hereof; make any investments except
investments made by bank subsidiaries in the ordinary course of business for
terms of up to one (1) year and in amounts of $100,000 or less; amend or
terminate any Plan except as required by law; make any contributions to any Plan
except as required by the terms of such Plan in effect as of the date hereof;
declare, set aside, make or pay any dividend or other distribution with respect
to its capital stock except any dividend declared by a subsidiary's Board of
Directors in accordance with applicable law and regulation; redeem, purchase or
otherwise acquire, directly or indirectly, any of the capital stock of
Mercantile or a Mercantile Subsidiary; increase the compensation of any
officers, directors or executive employees, except pursuant to existing
compensation plans and practices; sell or otherwise dispose of any shares of the
capital stock of any Mercantile Subsidiary; or sell or otherwise dispose of any
of its assets or properties other than in the ordinary course of business.

     (c)  Shareholder Actions.

          (i)  The Board of Directors of Mercantile will duly call, and will
     cause to be held not later than twenty-five (25) business days following
     the effective date of the Registration Statement referred to in paragraph
     5(c) hereof, and on a date acceptable to Norwest, a meeting of its
     shareholders and will direct that this 

                                      A-24
<PAGE>
 
     Agreement and the Merger Agreement be submitted to a vote at such meeting.
     The Board of Directors of Mercantile will (A) cause proper notice of such
     meeting to be given to its shareholders in compliance with the Delaware
     General Corporation Law and other applicable law and regulation, (B)
     recommend by the affirmative vote of the Board of Directors a vote in favor
     of approval of this Agreement and the Merger Agreement, and (C) use its
     best efforts to solicit from its shareholders proxies in favor thereof.
     Notwithstanding the foregoing, such meeting will not be required to be
     called or held if the Board of Directors of Mercantile obtains the
     unanimous written consent of the shareholders of Mercantile approving this
     Agreement and the Merger Agreement on or before the twenty-fifth (25th)
     business day (and on a date acceptable to Norwest) following the effective
     date of the Registration Statement referred to in paragraph 5(c) hereof.

          (ii)  The Board of Directors of Bank will duly call, and will cause to
     be held not later than twenty-five (25) business days following the
     effective date of the Registration Statement referred to in paragraph 5(c)
     hereof, and on a date acceptable to Norwest, a meeting of its shareholders
     and will direct that this Agreement and the Consolidation Agreement be
     submitted to a vote at such meeting.  The Board of Directors of Bank will
     (A) cause proper notice of such meeting to be given to its shareholders in
     compliance with the National Bank Act and other applicable law and
     regulation, (B) recommend by the affirmative vote of the Board of Directors
     a vote in favor of approval of this Agreement and the Consolidation
     Agreement, and (C) use its best efforts to solicit from its shareholders
     proxies in favor thereof. Notwithstanding the foregoing, such meeting will
     not be required to be called or held if the Board of Directors of Bank
     obtains the unanimous written consent of the shareholders of Bank approving
     this Agreement and the Consolidation Agreement on or before the twenty-
     fifth (25th) business day (and on a date acceptable to Norwest) following
     the effective date of the Registration Statement referred to in paragraph
     5(c) hereof.

          (iii)  Mercantile and Bank agree to cause the meetings (or unanimous
     consent actions in lieu of meetings) of their respective shareholders to be
     held on or be effective on the same date.

     (d)  Mercantile and Bank will furnish or cause to be furnished to Norwest
all the information concerning Mercantile and the Mercantile Subsidiaries
required for inclusion in the Registration Statement referred to in paragraph
5(c) hereof, or any statement or application made by Norwest to any governmental
body in connection with the transactions contemplated by this Agreement.  Any
financial statement for any fiscal year provided under this paragraph must
include the audit opinion and the consent of Burton, McCumber & Prichard, L.L.C.
to use such opinion in such Registration Statement.

                                      A-25
<PAGE>
 
     (e)  Mercantile and Bank will take all necessary corporate and other action
and use its best efforts to obtain all approvals of regulatory authorities,
consents and other approvals required of Mercantile and Bank to carry out the
Transactions contemplated by this Agreement and will cooperate with Norwest to
obtain all such approvals and consents required of Norwest.

     (f)  Mercantile and Bank will use its respective best efforts to deliver to
the Closing all opinions, certificates and other documents required to be
delivered by it at the Closing.

     (g)  Mercantile and the Mercantile Subsidiaries will hold in confidence all
documents and information concerning Norwest and its subsidiaries furnished to
Mercantile and the Mercantile Subsidiaries and their representatives in
connection with the Transactions contemplated by this Agreement and will not
release or disclose such information to any other person, except as required by
law and except to Mercantile's and the Mercantile Subsidiaries' outside
professional advisers in connection with this Agreement, with the same
undertaking from such professional advisers.  If the Transactions contemplated
by this Agreement shall not be consummated, such confidence shall be maintained
and such information shall not be used in competition with Norwest (except to
the extent that such information can be shown to be previously known to
Mercantile or any Mercantile Subsidiary, in the public domain, or later acquired
by Mercantile and any Mercantile Subsidiary from other legitimate sources) and,
upon request, all such documents, any copies thereof and extracts therefrom
shall immediately thereafter be returned to Norwest.

     (h)  Neither Mercantile, nor any Mercantile Subsidiary, nor any director,
officer, representative or agent thereof, will, directly or indirectly, solicit,
authorize the solicitation of or enter into any discussions with any
corporation, partnership, person or other entity or group (other than Norwest)
concerning any offer or possible offer (i) to purchase any shares of common
stock, any option or warrant to purchase any shares of common stock, any
securities convertible into any shares of such common stock, or any other equity
security of Mercantile or any Mercantile Subsidiary, (ii) to make a tender or
exchange offer for any shares of such common stock or other equity security,
(iii) to purchase, lease or otherwise acquire the assets of Mercantile or any
Mercantile Subsidiary except in the ordinary course of business, or (iv) to
merge, consolidate or otherwise combine with Mercantile or any Mercantile
Subsidiary.  If any corporation, partnership, person or other entity or group
makes an offer or inquiry to Mercantile or any Mercantile Subsidiary concerning
any of the foregoing, Mercantile or such Mercantile Subsidiary will promptly
disclose such offer or inquiry, including the terms thereof, to Norwest.

     (i)  Mercantile shall consult with Norwest as to the form and substance of
any proposed press release or other proposed public disclosure of matters
related to this Agreement or any of the Transactions contemplated hereby.

                                      A-26
<PAGE>
 
     (j)  Mercantile and each Mercantile Subsidiary will take all action
necessary or required (i) to terminate or amend, if requested by Norwest, all
qualified pension and welfare benefit plans and all non-qualified benefit plans
and compensation arrangements as of the Effective Date of the Merger, and (ii)
to submit application to the Internal Revenue Service for a favorable
determination letter for each of the Plans which is subject to the qualification
requirements of Section 401(a) of the Code prior to the Effective Date of the
Merger.

     (k)  Neither Mercantile nor any Mercantile Subsidiary shall take any action
which with respect to Mercantile would disqualify the Merger as a "pooling of
interests" for accounting purposes.

     (l)  Mercantile and Bank shall each use its respective best efforts to
obtain and deliver at least thirty-two (32) days prior to the Effective Date of
the Merger signed representations substantially in the form attached hereto as
Exhibit C ("Affiliate Letter") to Norwest by each executive officer, director or
shareholder of Mercantile and Bank who may reasonably be deemed an "affiliate"
of Mercantile or Bank within the meaning of such term as used in Rule 145 under
the Securities Act.

     (m)  At or before the Closing Date, Mercantile shall establish such
additional accruals and reserves as may be necessary to conform Mercantile's
accounting and credit loss reserve practices and methods to those of Norwest and
Norwest's plans with respect to the conduct of Mercantile's business following
the Merger and to provide for the costs and expenses relating to the
consummation by Mercantile of the Merger and the other Transactions contemplated
by this Agreement; provided, however, that (a) Mercantile shall not be required
to take such actions more than one (1) day prior to the Closing Date or prior to
the time Norwest and Norwest Bank agree in writing that all of the conditions to
their obligation to close as set forth in paragraph 7 have been satisfied or
waived (other than the deliveries to be made on the Closing Date), and (b) based
upon consultation with counsel and accountants for Mercantile, no such
adjustment shall (i) require any filing with any governmental agency or
regulatory authority, (ii) violate any law, rule or regulation applicable to
Mercantile or the Bank, or (iii) otherwise materially disadvantage Mercantile or
the Bank if the Merger were not consummated; provided that in any event no
accrual or reserve made by Mercantile or Bank pursuant to this paragraph 4(m),
or any litigation or regulatory proceeding arising out of any such accrual or
reserve, shall constitute or be deemed to be a breach, violation of or failure
to satisfy any representation, warranty, covenant, condition or other provision
of this Agreement or otherwise be considered in determining whether any such
breach, violation or failure to satisfy shall have occurred.  The recording of
such adjustments pursuant to this paragraph 4(m) shall not be deemed to imply
any misstatement of previously furnished financial statements or information any
shall not be construed as concurrence of Mercantile's management with any such
adjustments, and shall not affect the Merger Value, the Bank Consolidation
Value, the Nominal Value, or the Norwest Measurement Price.

                                      A-27
<PAGE>
 
     (n)  Mercantile shall obtain, at its sole expense, Phase I environmental
assessments for each bank owned facility, properties held by the Bank in trust
or a fiduciary capacity, and each non-residential OREO property.  Oral reports
of such environmental assessments shall be delivered to Norwest no later than
four (4) weeks and written reports shall be delivered to Norwest no later than
eight (8) weeks from the date of this Agreement.  Mercantile shall obtain, at
its sole expense, Phase II environmental assessments for properties identified
by Norwest on the basis of the results of such Phase I environmental
assessments.  Mercantile shall obtain a survey and assessment of all potential
asbestos containing material in owned or leased properties (other than OREO
property)  and a written report of the results shall be delivered to Norwest
within eight (8) weeks of execution of the definitive agreement.

     (o)  Mercantile shall obtain, at its sole expense, commitments for title
insurance and real estate surveys for each bank owned facility which shall be
delivered to Norwest no later than eight (8) weeks from the date of this
Agreement.

     (p)  Mercantile will cooperate with Norwest to assess the impact of the
Transactions contemplated by this Agreement on Mercantile's continued actions to
comply with the FFIEC Requirements and Mercantile will take such action, in
consultation with Norwest, as may be necessary to amend Mercantile's Year 2000
project assessment and remediation plan in order to comply with FFIEC
Requirements.  Mercantile will prepare a contingency plan for Mercantile to be
in compliance with FFIEC Requirements to be used in the event the Transactions
contemplated by this Agreement are not consummated.  Mercantile will consult and
cooperate with Norwest concerning credit, customer, and vendor assessments and
criteria for FFIEC Requirements.

     5.  Covenants of Norwest.  Norwest covenants and agrees with Mercantile and
Bank as follows:

     (a)  From the date hereof until the Effective Times, Norwest will maintain
its corporate existence in good standing; conduct, and cause the Norwest
Subsidiaries to conduct, their respective businesses in compliance with all
material obligations and duties imposed on them by all laws, governmental
regulations, rules and ordinances, and judicial orders, judgments and decrees
applicable to Norwest or the Norwest Subsidiaries, their businesses or their
properties; maintain all books and records of it and the Norwest Subsidiaries,
including all financial statements, in accordance with the accounting principles
and practices consistent with those used for the Norwest Financial Statements,
except for changes in such principles and practices required under generally
accepted accounting principles.

                                      A-28
<PAGE>
 
     (b)  Norwest will furnish to Mercantile and Bank all the information
concerning Norwest required for inclusion in a proxy statement or statements to
be sent to the shareholders of Mercantile and Bank, or in any statement or
application made by Mercantile to any governmental body in connection with the
Transactions contemplated by this Agreement.

     (c)  As promptly as practicable after the execution of this Agreement,
Norwest will file with the SEC a registration statement on Form S-4 (the
"Registration Statement") under the Securities Act and any other applicable
documents, relating to the shares of Norwest Common Stock to be delivered to the
sole shareholder of Mercantile pursuant to the Merger Agreement and to the
shareholders of Bank pursuant to the Consolidation Agreement, and will use its
best efforts to cause the Registration Statement to become effective.  At the
time the Registration Statement becomes effective, the Registration Statement
will comply in all material respects with the provisions of the Securities Act
and the published rules and regulations thereunder, and will not contain any
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein not false or
misleading, and at the time of mailing thereof to the Mercantile and Bank
shareholders, at the time of the Mercantile and Bank shareholders' meetings (or
the effective dates of any unanimous consent actions in lieu of meetings)
referred to in paragraph 4(c) hereof and at the Effective Times the prospectus
included as part of the Registration Statement, as amended or supplemented by
any amendment or supplement filed by Norwest (hereinafter the "Prospectus"),
will not contain any untrue statement of a material fact or omit to state any
material fact necessary to make the statements therein not false or misleading;
provided, however, that none of the provisions of this subparagraph shall apply
to statements in or omissions from the Registration Statement or the Prospectus
made in reliance upon and in conformity with information furnished by Mercantile
or any Mercantile Subsidiary for use in the Registration Statement or the
Prospectus.

     (d)  Norwest will file all documents required to be filed to list the
Norwest Common Stock to be issued pursuant to the Merger Agreement and the
Consolidation Agreement on the New York Stock Exchange and the Chicago Stock
Exchange and use its best efforts to effect said listings.

     (e)  The shares of Norwest Common Stock to be issued by Norwest to the
shareholders of Mercantile and Bank pursuant to this Agreement, the Merger
Agreement, and the Consolidation Agreement will, upon such issuance and delivery
to said shareholders pursuant to the Merger Agreement and the Consolidation
Agreement, be duly authorized, validly issued, fully paid and nonassessable.
The shares of Norwest Common Stock to be delivered to the shareholders of
Mercantile and Bank pursuant to the Merger Agreement and the Consolidation
Agreement are and will be free of any preemptive rights of the stockholders of
Norwest.

                                      A-29
<PAGE>
 
     (f)  Norwest will file all documents required to obtain, prior to the
Effective Times, all necessary Blue Sky permits and approvals, if any, required
to carry out the Transactions contemplated by this Agreement, will pay all
expenses incident thereto and will use its best efforts to obtain such permits
and approvals.

     (g)  Norwest will take all necessary corporate and other action and file
all documents required to obtain and will use its best efforts to obtain all
approvals of regulatory authorities, consents and approvals required of it to
carry out the Transactions contemplated by this Agreement and will cooperate
with Mercantile and Bank to obtain all such approvals and consents required by
Mercantile and Bank.

     (h)  Norwest will hold in confidence all documents and information
concerning Mercantile and Mercantile's Subsidiaries furnished to it and its
representatives in connection with the Transactions contemplated by this
Agreement and will not release or disclose such information to any other person,
except as required by law and except to its outside professional advisers in
connection with this Agreement, with the same undertaking from such professional
advisers.  If the Transactions contemplated by this Agreement shall not be
consummated, such confidence shall be maintained and such information shall not
be used in competition with Mercantile (except to the extent that such
information can be shown to be previously known to Norwest, in the public
domain, or later acquired by Norwest from other legitimate sources) and, upon
request, all such documents, copies thereof or extracts therefrom shall
immediately thereafter be returned to Mercantile.

     (i)  Norwest will file any documents or agreements required to be filed in
connection with the Merger and the Consolidation under the Delaware General
Corporation Law and the National Bank Act, respectively.

     (j)  Norwest will use its best efforts to deliver to the Closing all
opinions, certificates and other documents required to be delivered by it at the
Closing.

     (k)  Norwest shall consult with Mercantile and Bank as to the form and
substance of any proposed press release or other proposed public disclosure of
matters related to this Agreement or any of the Transactions contemplated
hereby.

     (l)  Norwest shall give Mercantile  and Bank notice of receipt of the
regulatory approvals referred to in paragraph 7(e).

     (m)  Neither Norwest nor any Norwest Subsidiary shall take any action which
with respect to Norwest would disqualify the Transaction as a "pooling of
interests" for accounting purposes.

     (n)  For a period not exceeding fifteen (15) days prior to the Closing
Date, subject to applicable securities laws and regulations and any obligations
of confidentiality to which Norwest may be subject, Norwest will permit
Mercantile and Bank and their 

                                      A-30
<PAGE>
 
respective representatives to examine its books, records and properties and
interview officers, employees and agents of Norwest at all reasonable times when
it is open for business. No such examination by Mercantile or Bank or their
respective representatives shall in any way affect, diminish or terminate any of
the representations, warranties or covenants of Norwest herein expressed.

     6.  Conditions Precedent to Obligation of Mercantile and Bank.  The
obligation of Mercantile to effect the Merger and of Bank to effect the
Consolidation shall be subject to the satisfaction at or before the Time of
Filing of the following further conditions, which may be waived in writing by
Mercantile and Bank:

     (a)  Except as they may be affected by the Transactions contemplated hereby
and except to the extent such representations and warranties are by their
express provisions made as of a specified date and except for activities or
Transactions after the date of this Agreement made in the ordinary course of
business and not expressly prohibited by this Agreement, the representations and
warranties contained in paragraph 3 hereof shall be true and correct in all
respects material to Norwest and the Norwest Subsidiaries taken as a whole as if
made at the Time of Filing.

     (b)  Norwest shall have, or shall have caused to be, performed and observed
in all material respects all covenants, agreements and conditions hereof to be
performed or observed by it, Merger Co., and Norwest Bank at or before the Time
of Filing.

     (c)  Mercantile and Bank shall have received favorable certificates, dated
as of the Effective Date of the Merger and the Effective Date of the
Consolidation, signed by the Chairman, the President or any Executive Vice
President or Senior Vice President and by the Secretary or Assistant Secretary
of Norwest, as to the matters set forth in subparagraphs (a) and (b) of this
paragraph 6.

     (d) (i)  This Agreement and the Merger Agreement shall have been approved
by the unanimous written consent of the sole shareholder of Mercantile in
accordance with the provisions of Mercantile's Certificate of Incorporation and
the Delaware General Corporation Act, and (ii) this Agreement and the
Consolidation Agreement shall have been approved by the unanimous written
consent of the shareholders of the Bank or the affirmative vote of the holders
of the percentage of the outstanding shares of Bank required for approval of a
plan of consolidation in accordance with the provisions of the Bank's Articles
of Association and the National Bank Act.

     (e)  Norwest shall have received approval by the Federal Reserve Board and
by such other governmental agencies as may be required by law of the
Transactions contemplated by this Agreement, the Merger Agreement, and the
Consolidation Agreement and all waiting and appeal periods prescribed by
applicable law or regulation shall have expired.

                                      A-31
<PAGE>
 
     (f)  No court or governmental authority of competent jurisdiction shall
have issued an order restraining, enjoining or otherwise prohibiting the
consummation of the Transactions contemplated by this Agreement.

     (g)  The shares of Norwest Common Stock to be delivered to the stockholders
of Mercantile and Bank pursuant to this Agreement, the Merger Agreement, and the
Consolidation Agreement shall have been authorized for listing on the New York
Stock Exchange and the Chicago Stock Exchange.

     (h)  The Registration Statement (as amended or supplemented) shall have
become effective under the Securities Act and shall not be subject to any stop
order, and no action, suit, proceeding or investigation by the SEC to suspend
the effectiveness of the Registration Statement shall have been initiated and be
continuing, or have been threatened and be unresolved.  Norwest shall have
received all state securities law or blue sky authorizations necessary to carry
out the Transactions contemplated by this Agreement.

     (i)  Mercantile and Bank shall have received an opinion, dated the Closing
Date, of counsel to Mercantile and Bank, substantially to the effect that, for
federal income tax purposes:  (i) the Merger will constitute a reorganization
within the meaning of Sections 368(a)(1)(A) and 368(a)(2)(E) of the Code and the
Consolidation will constitute a reorganization within the meaning of Section
368(a)(1)(B) of the Code; (ii) no gain or loss will be recognized by the holders
of Mercantile Common Stock or Bank Common Stock upon receipt of Norwest Common
Stock except for cash received in lieu of fractional shares; (iii) the basis of
the Norwest Common Stock received by the shareholders of Mercantile and Bank
will be the same as the basis of Mercantile Common Stock or Bank Common Stock
exchanged therefor; and (iv) the holding period of the shares of Norwest Common
Stock received by the shareholders of Mercantile and Bank will include the
holding period of the Mercantile Common Stock or Bank Common Stock, provided
such shares of Mercantile Common Stock or Bank Common Stock were held as a
capital asset as of the Effective Time of the Merger or the Effective Time of
the Consolidation, as the case may be.

     7.  Conditions Precedent to Obligation of Norwest and Norwest Bank.  The
obligation of Norwest to effect the Merger and of Norwest and Norwest Bank to
effect the Consolidation shall be subject to the satisfaction at or before the
Time of Filing of the following conditions, which may be waived in writing by
Norwest:

     (a)  Except as they may be affected by Transactions contemplated hereby and
except to the extent such representations and warranties are by their express
provisions made as of a specified date and except for activities or Transactions
or events occurring after the date of this Agreement made in the ordinary course
of business and not expressly prohibited by this Agreement, the representations
and warranties contained in paragraph 2 hereof shall be true and correct in all
respects material to Mercantile and the Mercantile Subsidiaries taken as a whole
as if made at the Time of Filing.

                                      A-32
<PAGE>
 
     (b)  Mercantile shall have, or shall have caused to be, performed and
observed in all material respects all covenants, agreements and conditions
hereof to be performed or observed by it at or before the Time of Filing.

     (c)  (i) This Agreement and the Merger Agreement shall have been approved
by the unanimous written consent of the sole shareholder of Mercantile in
accordance with the provisions of Mercantile's Certificate of Incorporation and
the Delaware General Corporation Law, and the National Bank Act, as applicable,
and (ii) this Agreement and the Consolidation Agreement shall have been approved
by the unanimous written consent of the shareholders of the Bank or the
affirmative vote of the holders of the percentage of the outstanding shares of
Bank required for approval of a plan of consolidation in accordance with the
provisions of the Bank's Articles of Association and the National Bank Act.

     (d)  Norwest shall have received favorable certificates dated as of the
Effective Date of the Merger  and the Effective Date of the Consolidation signed
by the Chairman or President and by the Secretary or Assistant Secretary of
Mercantile, as to the matters set forth in subparagraphs (a) through (c) of this
paragraph 7.

     (e)  Norwest shall have received approval by all governmental agencies as
may be required by law of the Transactions contemplated by this Agreement, the
Merger Agreement, and the Consolidation Agreement and all waiting and appeal
periods prescribed by applicable law or regulation shall have expired.  No
approvals, licenses or consents granted by any regulatory authority shall
contain any condition or requirement relating to Mercantile or any Mercantile
Subsidiary or to Norwest as a result of the Merger that, in the good faith
judgment of Norwest, is unreasonably burdensome to Norwest.

     (f)  Mercantile and each Mercantile Subsidiary shall have obtained any and
all material consents or waivers from other parties to loan agreements, leases
or other contracts material to Mercantile's or such subsidiary's business
required for the consummation of the Merger, and Mercantile and each Mercantile
Subsidiary shall have obtained any and all material permits, authorizations,
consents, waivers and approvals required for the lawful consummation by it of
the Merger and the Consolidation.

     (g)  No court or governmental authority of competent jurisdiction shall
have issued an order restraining, enjoining or otherwise prohibiting the
consummation of the Transactions contemplated by this Agreement.

     (h)  There shall be no facts with respect to Mercantile which would
disqualify the Transaction as a "pooling of interests" for accounting purposes
and Norwest shall have received from Burton, McCumber & Prichard, L.L.C. an
opinion to that effect.

                                      A-33
<PAGE>
 
     (i)  At any time since the date hereof the total number of shares of
Mercantile Common Stock and Bank Common Stock outstanding and subject to
issuance upon exercise (assuming for this purpose that phantom shares and other
share-equivalents constitute Mercantile Common Stock and Bank Common Stock) of
all warrants, options, conversion rights, phantom shares or other share-
equivalents, other than any option held by Norwest, shall not have exceeded
1,000 and 2,739,928, respectively.

     (j)  The Registration Statement (as amended or supplemented) shall have
become effective under the Securities Act and shall not be subject to any stop
order, and no action, suit, proceeding or investigation by the SEC to suspend
the effectiveness of the Registration Statement shall have been initiated and be
continuing, or have been threatened or be unresolved.  Norwest shall have
received all state securities law or blue sky authorizations necessary to carry
out the Transactions contemplated by this Agreement.

     (k)  Norwest shall have received from the Chief Executive Officer and Chief
Financial Officer of Mercantile a letter, dated as of the effective date of the
Registration Statement and updated through the date of Closing, in form and
substance satisfactory to Norwest, to the effect that:

     (i)  the interim quarterly financial statements of Mercantile included or
     incorporated by reference in the Registration Statement are prepared in
     accordance with generally accepted accounting principles applied on a basis
     consistent with the audited financial statements of Mercantile;

     (ii)  the amounts reported in the interim quarterly financial statements of
     Mercantile agree with the general ledger of Mercantile;

     (iii)  the annual and quarterly financial statements of Mercantile and the
     Mercantile Subsidiaries included in, or incorporated by reference in, the
     Registration Statement comply as to form in all material respects with the
     applicable accounting requirements of the Securities Act and the published
     rules and regulations thereunder;

     (iv)  from September 30, 1998 (or, if later, since the date of the most
     recent unaudited consolidated financial statements of Mercantile and the
     Mercantile Subsidiaries as may be included in the Registration Statement)
     to a date five (5) days prior to the effective date of the Registration
     Statement or five (5) days prior to the Closing, there are no increases in
     long-term debt, changes in the capital stock or decreases in stockholders'
     equity of Mercantile and the Mercantile Subsidiaries, except in each case
     for changes, increases or decreases which the Registration Statement
     discloses have occurred or may occur or which are described in such
     letters. For the same period, there have been no decreases in consolidated
     net interest income, consolidated net interest income after provision for
     credit losses, consolidated income before income taxes, consolidated net

                                      A-34
<PAGE>
 
     income and net income per share amounts of Mercantile and the Mercantile
     Subsidiaries, or in income before equity in undistributed income of
     subsidiaries, in each case as compared with the comparable period of the
     preceding year, except in each case for changes, increases or decreases
     which the Registration Statement discloses have occurred or may occur or
     which are described in such letters;

     (v)  they have reviewed certain amounts, percentages, numbers of shares and
     financial information which are derived from the general accounting records
     of Mercantile and the Mercantile Subsidiaries, which appear in the
     Registration Statement under the certain captions to be specified by
     Norwest, and have compared certain of such amounts, percentages, numbers
     and financial information with the accounting records of Mercantile and the
     Mercantile Subsidiaries and have found them to be in agreement with
     financial records and analyses prepared by Mercantile included in the
     annual and quarterly financial statements, except as disclosed in such
     letters.

     (l)  Mercantile and the Mercantile Subsidiaries considered as a whole shall
not have sustained since December 31, 1997 any material loss or interference
with their business from any civil disturbance or any fire, explosion, flood or
other calamity, whether or not covered by insurance.

     (m)  There shall be no reasonable basis for any proceeding, claim or action
of any nature seeking to impose, or that could result in the imposition on
Mercantile or any Mercantile Subsidiary of, any liability relating to the
release of hazardous substances as defined under any local, state or federal
environmental statute, regulation or ordinance including, without limitation,
CERCLA, which has had or could reasonably be expected to have a material adverse
effect upon Mercantile and its subsidiaries taken as a whole.

     (n)  Since December 31, 1997, no change shall have occurred and no
circumstances shall exist which has had or might reasonably be expected to have
a material adverse effect on the financial condition, results of operations,
business or prospects of Mercantile and the Mercantile Subsidiaries taken as a
whole (other than changes in banking laws or regulations, or interpretations
thereof, that affect the banking industry generally or changes in the general
level of interest rates).

     (o)  The waiver addressed to Bank from The Bank of New York dated July 22,
1998 shall be in full force and effect, and a certified original thereof shall
have been provided to Norwest.

     (q)  Either Mercantile shall be in material compliance with current FFIEC
Requirements or there shall be no feature of Mercantile's data processing,
operating or platform systems that would prevent those systems from being
successfully converted to Norwest systems on or before June 30, 1999.

                                      A-35
<PAGE>
 
     (r)  Each shareholder of Mercantile and Bank who may be deemed to be an
"affiliate" of Mercantile or Bank within the meaning of such term as used in
Rule 145 under the Securities Act shall have executed and delivered the
Affiliate Letter.

     (s)  The employment agreements of even date between Graciela Gutierrez and
Edward J. Bacak shall be in full force and effect (unless such agreements are
not in force and effect as a result of the death or disability of Graciela
Gutierrez or Edward J. Bacak).

     8.  Employee Benefit Plans.  Each person who is an employee of Mercantile
or any Mercantile Subsidiary as of the Effective Date of the Merger ("Mercantile
Employees") shall be eligible for participation in the employee welfare and
retirement plans of Norwest, as in effect from time to time, as follows:
 
     (a)  Employee Welfare Benefit Plans.  Each Mercantile employee shall be
eligible for participation in the employee welfare benefit plans of Norwest
listed below subject to any eligibility requirements applicable to such plans
(and not subject to pre-existing condition exclusions, except with respect to
the Norwest Long-Term Care Plan) and shall enter each plan not later than the
first day of the calendar quarter which begins at least thirty-two (32) days
after the Effective Date of the Merger (provided, however, that the transition
from the Mercantile plans to the Norwest plans will be facilitated without gaps
in coverage to the participants and without duplication in costs of Norwest):
 
     Medical Plan
     Dental Plan
     Vision Plan
     Short Term Disability Plan
     Long Term Disability Plan
     Long Term Care Plan
     Flexible Benefits Plan
     Basic Group Life Insurance Plan
     Group Universal Life Insurance Plan
     Dependent Group Life Insurance Plan
     Business Travel Accident Insurance Plan
     Accidental Death and Dismemberment Plan
     Severance Pay Plan (except for the employees named in paragraph 7(s)
       and except for James S. Scott)

Mercantile Employees shall remain on the Mercantile Vacation Program through the
end of the calendar year of the Effective Date and become eligible for
participation in the Norwest Vacation Program on the first day of the calendar
year following the Effective Date, under the terms and conditions of the Norwest
Vacation Program on that date.  Mercantile Employees shall receive credit for
years of service to Mercantile, the Mercantile Subsidiaries and any predecessors
of the Mercantile Subsidiaries (to the extent credited under the vacation and
short term disability programs of Mercantile) for the 

                                      A-36
<PAGE>
 
purpose of determining benefits under the Norwest Vacation Program and Short
Term Disability Plan and Severance Pay Plan.

     (b)  Employee Retirement Benefit Plans.  Each Mercantile Employee shall be
eligible for participation in the Norwest Savings-Investment Plan (the "SIP"),
subject to any eligibility requirements applicable to the SIP (with full credit
for years of past service to Mercantile and the Mercantile Subsidiaries for the
purpose of satisfying any eligibility and vesting periods applicable to the
SIP), and shall enter the SIP not later than the first day of the calendar
quarter which begins at least thirty-two (32) days after the Effective Date of
the Merger.

   Each Mercantile Employee shall be eligible for participation, as a new
employee, in the Norwest Pension Plan under the terms thereof.

     9.  Termination of Agreement.

     (a)  This Agreement may be terminated at any time prior to the Time of
Filing:

          (i)  by mutual written consent of the parties hereto;

          (ii)  by either Mercantile, if its Board of Directors determines by a
     vote of a majority of the members of its entire Board, or Norwest, in the
     event of either: (A) a breach by the other party of any representation or
     warranty contained herein, which breach cannot be or has not been cured
     within thirty (30) calendar days after the giving of written notice to the
     breaching party of such breach; or (B) a breach by the other party of any
     of the covenants or agreements contained herein, which breach cannot be or
     has not been cured within thirty (30) calendar days after the giving of
     written notice to the breaching party of such breach, provided that such
     breach would entitle the non-breaching party not to effect the Merger under
     Section 6 where the non-breaching party is Mercantile and under Section 7
     where the non-breaching party is Norwest.
          (iii) by either of the parties hereto upon written notice to the other
     party if the Merger shall not have been consummated by April 30, 1999
     unless such failure of consummation shall be due to the failure of the
     party seeking to terminate to perform or observe in all material respects
     the covenants and agreements hereof to be performed or observed by such
     party; or

          (iv) by Mercantile or Norwest upon written notice to the other party
     if any court or governmental authority of competent jurisdiction shall have
     issued a final order restraining, enjoining or otherwise prohibiting the
     consummation of the Transactions contemplated by this Agreement.

                                      A-37
<PAGE>
 
          (v)  by Mercantile, within five (5) business days after the end of the
     Index Measurement Period (as defined in subparagraph (c)(ii) below), if
     both of the following conditions are satisfied:
 
     (A)  the Norwest Measurement Price is less than $28.00; and

     (B)  the number obtained by dividing the Norwest Measurement Price by the
          closing price of Norwest Common Stock on the trading day immediately
          preceding the date of this Agreement is less than the number obtained
          by dividing the Final Index Price (as defined in subparagraph (c)
          below) by the Initial Index Price (as defined in subparagraph (c)
          below) and subtracting 15% from such quotient.

     (b)  Termination of this Agreement under this paragraph 9 shall not
release, or be construed as so releasing, either party hereto from any liability
or damage to the other party hereto arising out of the breaching party's willful
and material breach of the warranties and representations made by it, or willful
and material failure in performance of any of its covenants, agreements, duties
or obligations arising hereunder, and the obligations under paragraphs 1(f),
4(g), 5(h), and 10 shall survive such termination.

     (c)  For purposes of this paragraph 9:

          (i) The "Company Market Capitalization" shall mean (a) the price of
     one (1) share of the common stock of a given company at the close of the
     trading day immediately preceding the date of this Agreement multiplied by
     (b) the number of shares of common stock of such company outstanding as of
     June 30, 1998 (adjusted for any stock dividend, reclassification,
     recapitalization, exchange of shares or similar transaction between June
     30, 1998 and the close of the trading day immediately preceding the date of
     this Agreement).

          (ii) The "Index Group" shall mean all of those companies listed on
     Exhibit C the common stock of which is publicly traded and as to which
     there is, during the period of twenty (20) trading days ending on the day
     immediately preceding the effective date of the unanimous written consent
     of the sole shareholder of Mercantile approving this Agreement and the
     Merger Agreement (the "Index Measurement Period"), no pending publicly
     announced proposal for such company to be acquired, nor has there been any
     proposal by such company publicly announced subsequent to the day before
     the date of this Agreement to acquire another company in exchange for stock
     where, if the company to be acquired were to become a subsidiary of the
     acquiring company, the company to be acquired would be a "significant
     subsidiary" as defined in Rule 1-02 of Regulation S-X promulgated by the
     SEC nor has there been any program publicly announced subsequent to the day
     before the date of this Agreement to repurchase 5% or more of the
     outstanding shares of such company's common stock.

                                      A-38
<PAGE>
 
          (iii)  "The Initial Index Price" shall mean the sum of the following,
     calculated for each of the companies in the Index Group:  (a) the closing
     price per share of common stock of each such company on the trading day
     immediately preceding the date of this Agreement multiplied by (b) the
     Weighting Factor (as defined below) for each such company.

          (iv)  The "Final Index Price" shall mean the sum of the following,
     calculated for each of the companies in the Index Group:  (a) the Final
     Price for each such company multiplied by (b) the Weighting Factor (as
     defined below) for each such company.

          (v) The "Final Price" of any company in the Index Group shall mean the
     average of the daily closing prices of a share of common stock of such
     company, as reported on the consolidated transaction reporting system for
     the market or exchange on which such common stock is principally traded,
     during the Index Measurement Period.

          (vi) The "Total Market Capitalization" shall mean the sum of the
     Company Market Capitalization for each of the companies in the Index Group.

          (vii) The "Weighting Factor" for any given company shall mean the
     Company Market Capitalization for such company divided by the Total Market
     Capitalization.

     If a Common Stock Adjustment occurs with respect to the shares of Norwest
or any company in the Index Group between the date of this Agreement and the
Mercantile shareholder meeting date, the closing prices for the common stock of
such company shall be appropriately and proportionately adjusted for the
purposes of the definitions above so as to be comparable to what the price would
have been if the record date of the Common Stock Adjustment had been immediately
following the Effective Time of the Merger.

     10.  Expenses.  All expenses in connection with this Agreement and the
Transactions contemplated hereby, including without limitation legal and
accounting fees, incurred by Mercantile and Mercantile Subsidiaries shall be
borne by Mercantile, and all such expenses incurred by Norwest shall be borne by
Norwest.

     11.  Successors and Assigns.  This Agreement shall be binding upon and
inure to the benefit of the parties hereto and their respective successors and
assigns, but shall not be assignable by either party hereto without the prior
written consent of the other party hereto.

     12.  Third Party Beneficiaries.  Each party hereto intends that this
Agreement shall not benefit or create any right or cause of action in or on
behalf of any person other than the parties hereto, except that Don Olegario
Vasquez-Rana shall be a third party beneficiary of paragraph 1(f) hereof.

                                      A-39
<PAGE>
 
     13.  Notices.  Any notice or other communication provided for herein or
given hereunder to a party hereto shall be in writing and shall be delivered in
person or shall be mailed by first class registered or certified mail, postage
prepaid, addressed as follows:

          If to Norwest:

               Norwest Corporation
               Sixth and Marquette
               Minneapolis, Minnesota  55479-1026
               Attention:  Secretary

          If to Mercantile and Bank:

               Mercantile Financial Enterprises, Inc.
               c/o Mercantile Bank, National Association
               835 East Levee Street
               Brownsville, Texas  78520
               Attention:  Ms. Graciela Gutierrez

          With a copy to:

               Sullivan & Cromwell
               1888 Century Park East
               Los Angeles, California  90067
               Attention:  Stanley F. Farrar

          14.  Complete Agreement.  This Agreement, the Merger Agreement, and
the Consolidation Agreement contain the complete agreement between the parties
hereto with respect to the Merger and other Transactions contemplated hereby and
supersede all prior agreements and understandings between the parties hereto
with respect thereto.

          15.  Captions.  The captions contained in this Agreement are for
convenience of reference only and do not form a part of this Agreement.

          16.  Waiver and Other Action.  Either party hereto may, by a signed
writing, give any consent, take any action pursuant to paragraph 9 hereof or
otherwise, or waive any inaccuracies in the representations and warranties by
the other party and compliance by the other party with any of the covenants and
conditions herein.

          17.  Amendment.  At any time before the Time of Filing, the parties
hereto, by action taken by their respective Boards of Directors or pursuant to
authority delegated by their respective Boards of Directors, may amend this
Agreement; provided, however, that no amendment after approval by the
shareholders of Mercantile or Bank shall be made which changes in a manner
adverse to such shareholders the consideration to be provided 

                                      A-40
<PAGE>
 
to said shareholders pursuant to this Agreement, the Merger Agreement, or the
Consolidation Agreement, as applicable.

          18. Governing Law. This Agreement shall be construed and enforced in
accordance with the laws of the State of Delaware.

          19.  Non-Survival of Representations and Warranties.  No
representation or warranty contained in the Agreement, the Merger Agreement, or
the Consolidation Agreement shall survive the Merger or except as set forth in
paragraph 9(b), the termination of this Agreement.  Paragraphs 1(f) and 10 shall
survive the Merger and the Consolidation.

          20.  Counterparts.  This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original but all of which shall
constitute but one instrument.



           [The rest of this page has intentionally been left blank.]
        _______________________________________________________________

                                      A-41
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

                              NORWEST CORPORATION


                              By      /s/  John E. Ganoe
                                      ----------------------------
                                 Its  Executive Vice President
                                      ----------------------------



                              MERCANTILE FINANCIAL ENTERPRISES, INC.


                              By      /s/ Don Olegario Vazquez-Rana
                                      -----------------------------
                                 Its  Chairman of the Board
                                      -----------------------------


                              MERCANTILE BANK,
                                  NATIONAL ASSOCIATION


                              By     /s/ Graciela Gutierrez
                                     ------------------------------
                                 Its   Director General and Chief
                                       ----------------------------
                                       Executive Officer
                                       ----------------------------

                                      A-42
<PAGE>
 
                                                                     EXHIBIT A-1


                          AGREEMENT AND PLAN OF MERGER
                                    between
                    MERCANTILE FINANCIAL ENTERPRISES, INC.,
                             a Delaware corporation
                          (the surviving corporation)
                                      and
                                MBS MERGER CO.,
                             a Delaware corporation
                            (the merged corporation)
                                        


          This Agreement and Plan of Merger dated as of _____________, 1998,
between MERCANTILE FINANCIAL ENTERPRISES, INC. ("Mercantile"), a Delaware
corporation (hereinafter sometimes called "Mercantile" and sometimes called the
"surviving corporation"), and MBS MERGER CO., a Delaware corporation ("MBS
Merger Co.") (said corporations being hereinafter sometimes referred to as the
"constituent corporations").

          WHEREAS, MBS Merger Co., a wholly-owned subsidiary of Norwest
Corporation ("Norwest"), was incorporated by Certificate of Incorporation filed
in the office of the Secretary of State of the State of Delaware on
____________, 1998, and said corporation is now a corporation subject to and
governed by the provisions of the Delaware General Corporation Law.  MBS Merger
Co. has authorized capital stock of 1,000 shares of common stock, par value of
$1.00 per share ("MBS Merger Co. Common Stock").  As of _____________, 1998,
there were 1,000 shares of MBS Merger Co. Common Stock outstanding and no shares
were held in the treasury; and

          WHEREAS, Mercantile was incorporated by Certificate of Incorporation
filed in the office of the Secretary of State of the State of Delaware on
_______________, 19__, and said corporation is now a corporation subject to and
governed by the provisions of the Delaware General Corporation Law, with
authorized capital stock consisting of 100,000 shares of capital stock
consisting of 100,000 shares of common stock, $1.00 par value per share
("Mercantile Common Stock"), of which _________ shares of Mercantile Common
Stock were outstanding and no shares of Mercantile Common Stock were held in the
treasury; and

          WHEREAS, Norwest, Mercantile, and Mercantile Bank, National
Association are parties to an Agreement and Plan of Reorganization dated as of
October __, 1998 (the "Reorganization Agreement"), setting forth certain
representations, warranties and covenants in connection with the merger provided
for herein;
<PAGE>
 
          WHEREAS, the directors, or a majority of them, of each of the
constituent corporations respectively deem it advisable for the welfare and
advantage of said corporation and for the best interests of the respective
shareholders of said corporations that said corporations merge and that MBS
Merger Co. be merged with and into Mercantile, with Mercantile continuing as the
surviving corporation, on the terms and conditions hereinafter set forth in
accordance with the provisions of the Delaware General Corporation Law, which
statute permits such merger; and

          NOW, THEREFORE, the parties hereto, subject to the approval of the
shareholders of MBS Merger Co. and Mercantile, in consideration of the premises
and of the mutual covenants and agreements contained herein and of the benefits
to accrue to the parties hereto, have agreed and do hereby agree that MBS Merger
Co. shall be merged with and into Mercantile pursuant to the laws of the State
of Delaware, and do hereby agree upon, prescribe and set forth the terms and
conditions of the merger of MBS Merger Co. with and into Mercantile, the mode of
carrying said merger into effect, the manner and basis of exchanging the shares
of Mercantile Common Stock for shares of common stock, par value $1-2/3 per
share, of Norwest ("Norwest Common Stock"), and such other provisions with
respect to said merger as are deemed necessary or desirable, as follows:

          FIRST:  At the time of merger, MBS Merger Co. shall be merged with and
into Mercantile, one of the constituent corporations, which shall be the
surviving corporation, and the separate existence of MBS Merger Co. shall cease
and the name of the surviving corporation shall remain "Mercantile Financial
Enterprises, Inc."

          SECOND:  The Articles of Incorporation of Mercantile at the time of
merger shall be the Articles of Incorporation of the surviving corporation until
amended according to law.

          THIRD:  The Bylaws of Mercantile at the time of merger shall be and
remain the Bylaws of the surviving corporation until amended according to the
provisions of the Articles of Incorporation of the surviving corporation or of
said Bylaws.

          FOURTH:  At the time of merger, the following-named persons shall
become the directors of the surviving corporation and shall hold office from the
time of merger until their respective successors are elected and qualify:

               [To be designated by MBS Merger Co.]



          FIFTH:  The officers of MBS Merger Co. at the time of merger shall
become and remain the officers of the surviving corporation and shall hold
office from the time of merger until their respective successors are elected or
appointed and qualify.

                                       2
<PAGE>
 
                    SIXTH:  The manner and basis of converting the shares of
Mercantile Common Stock shall be as follows:

     1.  [To conform to Reorganization Agreement.]

               2.  As soon as practicable after the merger becomes effective,
     each holder of a certificate which, prior to the effective time of the
     merger, represented shares of Mercantile Common Stock outstanding
     immediately prior to the time of merger shall be entitled, upon surrender
     of such certificate for cancellation to the surviving corporation or to
     Norwest Bank Minnesota, National Association, as the designated agent of
     the surviving corporation (the "Agent"), to receive a new certificate for
     the number of whole shares of Norwest Common Stock to which such holder
     shall be entitled on the basis set forth in paragraph 1 above.  Until so
     surrendered each certificate which, immediately prior to the time of
     merger, represented shares of Mercantile Common Stock shall not be
     transferable on the books of the surviving corporation but shall be deemed
     to evidence only the right to receive (except for the payment of dividends
     as provided below) the number of whole shares of Norwest Common Stock
     issuable on the basis above set forth; provided, however, until the holder
     of such certificate for Mercantile Common Stock shall have surrendered the
     same for exchange as above set forth, no dividend payable to holders of
     record of Norwest Common Stock as of any date subsequent to the effective
     date of merger shall be paid to such holder with respect to the shares of
     Norwest Common Stock, if any, issuable in connection with the merger, but,
     upon surrender and exchange thereof as herein provided, there shall be paid
     by the surviving corporation or the Agent to the record holder of such
     certificate representing Norwest Common Stock issued in exchange therefor
     an amount with respect to such shares of Norwest Common Stock equal to all
     dividends that shall have been paid or become payable to holders of record
     of Norwest Common Stock between the effective date of merger and the date
     of such exchange.

          3.  If between the date hereof and the time of merger, shares of
     Norwest Common Stock shall be changed into a different number of shares or
     a different class of shares by reason of any reclassification,
     recapitalization, split-up, combination, exchange of shares or
     readjustment, or if a stock dividend thereon shall be declared with a
     record date within such period, then the number of shares of Norwest Common
     Stock, if any, into which a share of Mercantile Common Stock shall be
     converted on the basis above set forth, will be appropriately and
     proportionately adjusted so that the number of such shares of Norwest
     Common Stock into which a share of Mercantile Common Stock shall be
     converted will equal the number of shares of Norwest Common Stock which the
     holders of shares of Mercantile Common Stock would have received pursuant
     to such reclassification, recapitalization, split-up, combination, exchange
     of shares or readjustment, or stock dividend had the record date therefor
     been immediately following the time of merger.

                                       3
<PAGE>
 
               4.  No fractional shares of Norwest Common Stock and no
     certificates or scrip certificates therefor shall be issued to represent
     any such fractional interest, and any holder of a fractional interest shall
     be paid an amount of cash equal to the product obtained by multiplying the
     fractional share interest to which such holder is entitled by the average
     of the closing prices of a share of Norwest Common Stock as reported by the
     consolidated tape of the New York Stock Exchange for each of the five (5)
     trading days ending on the day immediately preceding the meeting of
     shareholders held to approve the merger.

               5.  Each share of MBS Merger Co. Common Stock issued and
     outstanding at the time of merger shall be converted into and exchanged for
     one (1) share of the surviving corporation after the time of merger.

                    SEVENTH:  The merger provided for by this Agreement shall be
effective as follows:

               1.  The effective date of merger shall be the date on which the
     Articles of Merger (as described in subparagraph 1(b) of this Article
     Seventh) shall be delivered to and filed by the Secretary of State of the
     State of Delaware; provided, however, that all of the following actions
     shall have been taken in the following order:

                    a.  This Agreement shall be approved and adopted on behalf
          of MBS Merger Co. and Mercantile in accordance with the Delaware
          General  Corporation Law; and

                    b.  Articles of merger (with this Agreement attached as part
          thereof) with respect to the merger, setting forth the information
          required by the Delaware General Corporation Law, shall be executed by
          the President or a Vice President of MBS Merger Co. and by the
          Secretary or an Assistant Secretary of MBS Merger Co., and by the
          President or a Vice President of Mercantile and by the Secretary or an
          Assistant Secretary of Mercantile, and shall be filed in the office of
          the Secretary of State of the State of Delaware in accordance with the
          Delaware General Corporation Law; and

               2.  The merger shall become effective as of 11:59 p.m. (the "time
     of merger") on the effective date of merger.

                                      4 
<PAGE>
 
     EIGHTH:  At the time of merger:

               1.  The separate existence of MBS Merger Co. shall cease, and the
     corporate existence and identity of Mercantile shall continue as the
     surviving corporation.

               2.  The merger shall have the other effects prescribed by Section
     ____ of the Delaware General Corporation Law.

                    NINTH:  The following provisions shall apply with respect to
the merger provided for by this Agreement:

               1.  If at any time Mercantile shall consider or be advised that
     any further assignment or assurance in law or other action is necessary or
     desirable to vest, perfect or confirm in Mercantile the title to any
     property or rights of MBS Merger Co. acquired or to be acquired as a result
     of the merger provided for herein, the proper officers and directors of
     Mercantile and MBS Merger Co. may execute and deliver such deeds,
     assignments and assurances in law and take such other action as may be
     necessary or proper to vest, perfect or confirm title to such property or
     right in Mercantile and otherwise carry out the purposes of this Agreement.

               2.  For the convenience of the parties and to facilitate the
     filing of this Agreement, any number of counterparts hereof may be executed
     and each such counterpart shall be deemed to be an original instrument.

               3.  This Agreement and the legal relations among the parties
     hereto shall be governed by and construed in accordance with the laws of
     the State of Delaware.

               4.  This Agreement cannot be altered or amended except pursuant
     to an instrument in writing signed by both of the parties hereto.

          5.  At any time prior to the filing of Articles of Merger with the
     Secretary of State of the State of Delaware, this Agreement may be
     terminated in accordance with the terms of the Reorganization Agreement
     upon approval by the Board of Directors of either of the constituent
     corporations notwithstanding the approval of the shareholders of either
     constituent corporation.

          6.  Mercantile will be responsible for the payment of all fees and
     franchise taxes that may be owed by MBS Merger Co. and Mercantile will be
     obligated to pay such fees and franchise taxes if the same are not timely
     paid.

                                       5
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have cause this Agreement and
Plan of Merger to be signed in their respective corporate names by the
undersigned officers and their respective corporate seals to be affixed hereto,
pursuant to authority duly given by their respective Boards of Directors, all as
of the day and year first above written.


                              MBS MERGER CO.


                              By:__________________________________
                                 [Title]___________________________

Attest:


_____________________________ 
____________________, Secretary [Assistant Secretary]



MERCANTILE FINANCIAL SERVICES, INC.


                              By:__________________________________
                                 [Title]___________________________




Attest:


_____________________________ 
____________________, Secretary [Assistant Secretary]



                [Signature page to Agreement and Plan of Merger]


                                       6
<PAGE>
 
                                                                     EXHIBIT A-2
                                                                                


                      AGREEMENT AND PLAN OF CONSOLIDATION
                                        
          This Agreement and Plan of Consolidation (the "Consolidation
Agreement") is dated as of ______________, 19__, between NORWEST INTERIM BANK,
NATIONAL ASSOCIATION ("Interim Bank") and MERCANTILE BANK, NATIONAL ASSOCIATION,
Brownsville, Texas, a national banking association ("Bank").  Interim Bank and
Bank are sometimes referred to herein as the "Consolidating Banks."


                                    PREAMBLE
                                        
     Interim Bank and Bank acknowledge and confirm the following:

               (a)  Interim Bank is a national banking association having its
     principal office and place of business at ______________________, ________
     County, Texas _______.  As of __________, 1998, Interim Bank had capital of
     $100,000, divided into 1,000 shares of common stock, par value $100 per
     share ("Interim Bank Common Stock"), and surplus of $20,000.

               (b)  Bank is a national banking association having its principal
     office and place of business at 835 East Levee Street, Brownsville, Cameron
     County, Texas 78520.  As of __________, Bank had capital of $_________,
     divided into 2,739,928 shares of common stock, par value $1.00 per share
     ("Bank Common Stock"), surplus of $______, and retained earnings of
     $_______.

               (c)  Mercantile Financial Enterprises, Inc., Bank, and Norwest
     Corporation ("Norwest") have entered into an Agreement and Plan of
     Reorganization dated as of October __, 1998 (the "Reorganization
     Agreement"), which Reorganization Agreement contemplates the transactions
     to be effected by this Consolidation Agreement.

               (d)  A majority of the Boards of Directors of Interim Bank and of
     Bank have duly approved this Consolidation Agreement and authorized its
     execution.
<PAGE>
 
               (e)  It is the intent of the parties hereto to effect a corporate
     reorganization which qualifies as a tax-free reorganization pursuant to
     Section 368(a)(1)(B) of the Internal Revenue Code.

                                   AGREEMENTS
                                        
          IN CONSIDERATION OF THE PREMISES,  Interim Bank and Bank make this
Consolidation Agreement and fix the terms and conditions of the Consolidation of
Interim Bank and Bank (the "Consolidation") as follows:


                                   SECTION 1
                                        
     1.1 Pursuant to the authority of and in accordance with the provisions of
12 U.S.C. 215, Interim Bank shall be consolidated with Bank, under the charter
of Bank (the "Consolidated Bank").

     1.2 The name of the Consolidated Bank shall be "Mercantile Bank, National
Association."

     1.3  The Consolidation shall be effective as of 12:01 a.m. on the date
specified in the certificate of approval to be issued by the Comptroller of the
Currency of the United States, under the seal of his office, approving the
Consolidation (the "Effective Date").

     1.4  The business of the Consolidated Bank shall be that of a national
banking association and shall be conducted at the main office of the
Consolidated Bank, which shall be located at 835 East Levee Street, Brownsville,
Cameron County, Texas 78520, and at its legally established branches.


                                   SECTION 2
                                        
          As of the Effective Date:

     2.1 The corporate existences of the Consolidating Banks shall be
consolidated into the Consolidated Bank.

     2.2  All rights, franchises, and interests of the Consolidating Banks
in and to every type of property (real, personal and mixed) and choses in action
shall be transferred to and vested in the Consolidated Bank by virtue of the
Consolidation without any deed or other transfer.  The Consolidated Bank, upon
the Consolidation and without any order or other action on the part of any court
or otherwise, shall hold and enjoy all rights of property, franchises, and
interests, including appointments, designations, and nominations, and all other
rights and 

                                       2
<PAGE>
 
interests as trustee, executor, administrator, registrar of stocks and bonds,
guardian of estates, assignee, receiver, and in every other fiduciary capacity,
in the same manner and to the same extent as such rights, franchises, and
interests were held or enjoyed by either of the Consolidating Banks at the time
of Consolidation.

     2.3  The Consolidated Bank shall be liable for all liabilities of
every kind and description, including liabilities arising out of the operation
of a trust department, of each of the Consolidating Banks existing as of the
Effective Date.

     2.4  The amount of capital stock of the Consolidated Bank shall be
$________, divided into _____ shares of common stock, each of $____ par value,
and at the time the Consolidation shall become effective, the Consolidated Bank
shall have a surplus of $________ and retained earnings which, when combined
with the capital and surplus, will be equal to the combined capital structures
of the Consolidating Banks as stated in the preamble of this Consolidation
Agreement, adjusted, however, for the results of operations, the payment of
dividends, if any, between __________, and the Effective Date, and the payment
provided for in Section 3.2 hereof.


                                   SECTION 3
                                        
     As of the Effective Date:

     3.1  [To conform to Reorganization Agreement]

     3.2  As soon as practicable after the consolidation becomes effective, each
holder of a certificate which, prior to the effective time of the consolidation,
represented shares of Bank Common Stock outstanding immediately prior to the
time of consolidation (other than shares held by Mercantile) shall be entitled,
upon surrender of such certificate for cancellation to Norwest Bank Minnesota,
National Association, as the designated agent of the Consolidated Bank (the
"Agent"), to receive a new certificate representing the number of whole shares
of Norwest Common Stock to which such holder shall be entitled on the basis
above set forth.  Until so surrendered each certificate which, immediately prior
to the time of consolidation, represented shares of Bank Common Stock shall not
be transferable on the books of the Consolidated Bank but shall be deemed
(except for the payment of dividends as provided below) to evidence only the
right to receive the number of whole shares of Norwest Common Stock issuable on
the basis above set forth; provided, however, that, until the holder of such
certificate shall have surrendered the same as above set forth, no dividend
payable to holders of record of Norwest Common Stock as of any date subsequent
to the effective date of consolidation shall be paid to such holder with respect
to the shares of Norwest Common Stock issuable in connection with the
consolidation, but, upon surrender and exchange thereof as herein provided,
there shall be paid by the 

                                       3
<PAGE>
 
Agent to the record holder of such certificate representing Norwest Common Stock
issued in exchange therefor an amount with respect to such shares of Norwest
Common Stock equal to all dividends that shall have been paid or become payable
to holders of record of Norwest Common Stock between the effective date of the
consolidation and the date of such exchange.

     3.3  The shares of Interim Bank outstanding immediately prior to the
time of Consolidation shall be converted into and exchanged for _______ shares
of the Consolidated Bank, plus cash in the amount of $120,000.

     3.4  From and after the Effective Date, there shall be no transfers on
the stock transfer books of the Consolidated Bank of the shares of Bank Common
Stock or Interim Bank Common Stock which were issued and outstanding immediately
prior to the Effective Date.


                                   SECTION 4
                                        
     4.1  As of the Effective Date, the Articles of Association of the
Consolidated Bank shall be the Articles of Association of Bank and shall read in
their entirety as set forth in Appendix A attached hereto, and the Consolidated
Bank shall be authorized under such Articles of Association to issue _______
shares of common stock, par value $____ per share.

     4.2 The by-laws of Bank as they exist at the Effective Date shall continue
in full force as the by-laws of the Consolidated Bank until altered, amended, or
repealed as provided therein or as provided by law.

     4.3  As of the Effective Date, the following named persons shall serve
as the Board of Directors of the Consolidated Bank until the next annual meeting
of the shareholders or until such time as their successors have been elected and
have qualified:

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

     4.4  The officers of Bank holding office at the Effective Date shall
continue as the officers of the Consolidated Bank for the term prescribed in the
by-laws or until the Board of Directors otherwise shall determine.

                                       4
<PAGE>
 
                                   SECTION 5
                                        
     5.1 This Consolidation Agreement shall be submitted to the shareholders of
Bank and Interim Bank, respectively, for approval at meetings to be called and
held in accordance with the articles of association of Bank and the articles of
association of Interim Bank, and in accordance with applicable provisions of
law. Such approval by the shareholders shall require the affirmative vote of the
shareholders of each of the Consolidating Banks owning at least two-thirds of
its capital stock outstanding.

                                   SECTION 6
                                        
     6.1 The Consolidation shall be subject to and conditioned upon the
following:

          (a)  approval of this Consolidation Agreement by the shareholders of
     Bank and Interim Bank as required by law;

          (b)  approval of the Consolidation by all appropriate banking and
     regulatory authorities and the satisfaction of all other requirements
     prescribed by law necessary for consummation of the Consolidation; and

          (c)  satisfaction of the conditions precedent set forth in paragraphs
     6 and 7 of the Reorganization Agreement.

     6.2  At any time before the Effective Date, if any of the following
circumstances obtain, this Consolidation Agreement may be terminated, at the
election of Bank or Interim Bank, by written notice from the party so electing
to the other, or the consummation of the Consolidation may be postponed for such
period, and subject to such further rights of Bank and Interim Bank, or either
of them, to terminate this Consolidation Agreement as Bank and Interim Bank may
agree in writing:

          (a)  by mutual consent of the Boards of Directors of the Consolidating
     Banks if consummation of the Consolidation would be inadvisable in the
     opinion of said Boards; or

          (b)  by action of the Board of Directors of any party hereto if the
     Reorganization Agreement is terminated.

                                   SECTION 7
                                        
     7.1 Bank and Interim Bank, by mutual consent of their respective Boards of
Directors, may amend this Consolidation Agreement before the Effective Date;
provided, however, that after this Consolidation Agreement has been approved by

                                       5
<PAGE>
 
the shareholders of Bank, no such amendment shall affect the rights of such
shareholders of Bank in a manner which is materially adverse to such
shareholders.

     7.2 This Consolidation Agreement may be executed in several counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.

     IN WITNESS WHEREOF, Bank and Interim Bank have caused this Consolidation
Agreement to be executed by their respective duly authorized officers and their
corporate seals, if any, to be hereunto affixed as of the date first above
written, pursuant to a resolution of each Consolidating Bank's Board of
Directors, acting by a majority thereof.


(NO BANK SEAL)                NORWEST INTERIM BANK,
                                 NATIONAL ASSOCIATION
ATTEST:

                              By:__________________________________
                                  Its:_____________________________

__________________________
      Secretary



STATE OF TEXAS          )
                        ) ss
COUNTY OF_______________)

          On this _____ day of __________, 19__, before me, a Notary Public for
the State and County aforesaid, personally came___________________________
_________________________________, as _________________________________, and
_______________________________, as ________________________________, of NORWEST
INTERIM BANK, NATIONAL ASSOCIATION, and each in his or her said capacity
acknowledged the foregoing instrument to be the act and deed of said bank.

          WITNESS my official seal and signature this day and year aforesaid.


                              _____________________________________
(Seal of Notary)              Notary Public________________________
County
                              My Commission Expires________________

                                       6
<PAGE>
 
(BANK SEAL)                   MERCANTILE BANK,
                                 NATIONAL ASSOCIATION

ATTEST:

                              By:__________________________________
                                  Its:_____________________________


__________________________
      Secretary



STATE OF TEXAS          )
                        ) ss
COUNTY OF_______________)

          On this _____ day of __________, 19__, before me, a Notary Public for
the State and County aforesaid, personally came
_____________________________________, as _________________________________, and
_______________________________, as ________________________________, of
MERCANTILE BANK, NATIONAL ASSOCIATION, and each in his or her said capacity
acknowledged the foregoing instrument to be the act and deed of said bank and
the seal affixed thereto to be its seal.

     WITNESS my official seal and signature this day and year aforesaid.



                              _____________________________________
(Seal of Notary)              Notary Public,_______________________
County
                              My Commission Expires________________


                                       7
<PAGE>
 
                                                                       EXHIBIT B

Norwest Corporation
Norwest Center
Sixth and Marquette
Minneapolis, MN  55479-1026

Attn:  Secretary

Gentlemen:

          I have been advised that I might be considered to be an "affiliate,"
as that term is defined for purposes of paragraphs (c) and (d) of Rule 145
("Rule 145") promulgated by the Securities and Exchange Commission (the
"Commission") under the Securities Act of 1933, as amended (the "Securities
Act") of Mercantile Financial Enterprises, Inc., a Delaware corporation
("Mercantile") [Mercantile Bank, National Association, a national banking
association ("Bank")].

          Pursuant to an Agreement and Plan of Reorganization, dated as of
October 28, 1998 (the "Reorganization Agreement") between Mercantile,
[Mercantile Bank, National Association/Mercantile Financial Enterprises, Inc.]
and Norwest Corporation, a Delaware corporation ("Norwest"), it is contemplated
that a wholly-owned subsidiary of Norwest will merge with and into Mercantile
(the "Merger") [Mercantile will merge with and into a wholly-owned national bank
subsidiary of Norwest] and as a result, I will receive in exchange for each
share of Common Stock, par value $1.00 per share, of Mercantile ("Mercantile
Common Stock") owned by me immediately prior to the Effective Time of the Merger
(as defined in the Reorganization Agreement), a number of shares of Common
Stock, par value $1-2/3 per share, of Norwest ("Norwest Common Stock"), as more
specifically set forth in the Reorganization Agreement.

          I hereby agree as follows:

          I will not offer to sell, transfer or otherwise dispose of any of the
shares of Mercantile Common Stock or Norwest Common Stock held by me during the
30 days prior to the Effective Time of the Merger.

          I will not offer to sell, transfer or otherwise dispose of any of the
shares of Norwest Common Stock issued to me pursuant to the Merger (the "Stock")
except (a) in compliance with the applicable provisions of Rule 145, (b) in a
transaction that is otherwise exempt from the registration requirements of the
Securities Act, or (c) in an offering registered under the Securities Act.

          I will not sell, transfer or otherwise dispose of any Norwest Common
Stock or in any way reduce my risk relative to any shares of any Norwest common
Stock issued to me pursuant to the Merger until such time as financial results
covering at least 30 days of post-Merger combined operations of Mercantile and
Norwest have been published.
<PAGE>
 
          I consent to the endorsement of the Stock issued to me pursuant to the
Merger with a restrictive legend which will read substantially as follows:

                    "The shares represented by this certificate were issued in a
          transaction to which Rule 145 promulgated under the Securities Act of
          1933, as amended (the "Act"), applies, and may be sold or otherwise
          transferred only in compliance with the limitations of such Rule 145,
          or upon receipt by Norwest Corporation of an opinion of counsel
          reasonably satisfactory to it that some other exemption from
          registration under the Act is available, or pursuant to a registration
          statement under the Act."

          Norwest's transfer agent shall be given an appropriate stop transfer
order and shall not be required to register any attempted transfer of the shares
of the Stock, unless the transfer has been effected in compliance with the terms
of this letter agreement.

          It is understood and agreed that this letter agreement shall terminate
and be of no further force and effect and the restrictive legend set forth above
shall be removed by delivery of substitute certificates without such legend, and
the related stop transfer restrictions shall be lifted forthwith, if (a) (i) any
such shares of Stock shall have been registered under the Securities Act for
sale, transfer or other disposition by me or on my behalf and are sold,
transferred or otherwise disposed of, or (ii) any such shares of Stock are sold
in accordance with the provisions of paragraphs (c), (e), (f) and (g) of Rule
144 promulgated under the Securities Act, or (iii) I am not at the time of such
disposition an affiliate of Norwest and have been the beneficial owner of the
Stock for at least one year (or such other period as may be prescribed
thereunder) and Norwest has filed with the Commission all of the reports it is
required to file under the Securities Exchange Act of 1934, as amended, during
the preceding twelve months, or (iv) I am not and have not been for at least
three months an affiliate of Norwest and have been the beneficial owner of the
Stock for at least two years (or such other period as may be prescribed by the
Securities Act, and the rules and regulations promulgated thereunder), or (v)
Norwest shall have received an opinion of counsel acceptable to Norwest to the
effect that the stock transfer restrictions and the legend are not required, and
(b) financial results covering at least 30 days of post-Merger combined
operations have been published.

          I have carefully read this letter agreement and the Reorganization
Agreement and have discussed their requirements and other applicable limitations
upon my ability to offer to sell, transfer or otherwise dispose of shares of
Mercantile Common Stock, Norwest Common Stock, or the Stock, to the extent I
felt necessary, with my counsel or counsel for Mercantile.

                                      Sincerely,   

                                      _____________________________ 

                                       2
<PAGE>
 
                                                                       EXHIBIT C
                                                                                

               BB&T Corporation
               BancOne CorporationBankBoston CorporationBank of New York
               Company, Inc.
               Bankers Trust Corporation Chase Manhattan Corporation
               CiticorpComerica, Inc.
               Crestar Financial Corporation
               Fifth Third BancorpFirst Union CorporationFleet Financial Group,
               Inc.
               Huntington Bancshares
               KeyCorpMellon Bank Corporation
               Mercantile BancorpNational City CorporationBankAmerica
               Corporation
               Northern Trust CorporationPNC Financial Corporation
               Republic Financial Corporation
               Republic New York CorporationSignet Banking Corporation
               SouthTrust Corporation
               State Street Boston Corporation
               Summit BancorpSuntrust Banks, Inc.
               UnionBanCal Corp.
               U.S. Bancorp
               Wachovia Corporation
<PAGE>
  
                                   APPENDIX B

                      AGREEMENT AND PLAN OF CONSOLIDATION
<PAGE>
 
                      AGREEMENT AND PLAN OF CONSOLIDATION
                                        

          This Agreement and Plan of Consolidation (the "Consolidation
Agreement") is dated as of ______________, 19__, between NORWEST INTERIM BANK,
NATIONAL ASSOCIATION ("Interim Bank") and MERCANTILE BANK, NATIONAL ASSOCIATION,
Brownsville, Texas, a national banking association ("Bank").  Interim Bank and
Bank are sometimes referred to herein as the "Consolidating Banks."


                                    PREAMBLE
                                        
     Interim Bank and Bank acknowledge and confirm the following:

               (a)  Interim Bank is a national banking association having its
     principal office and place of business at ______________________, ________
     County, Texas _______.  As of __________, 1998, Interim Bank had capital of
     $100,000, divided into 1,000 shares of common stock, par value $100 per
     share ("Interim Bank Common Stock"), and surplus of $20,000.

               (b)  Bank is a national banking association having its principal
     office and place of business at 835 East Levee Street, Brownsville, Cameron
     County, Texas 78520.  As of __________, Bank had capital of $_________,
     divided into 2,739,928 shares of common stock, par value $1.00 per share
     ("Bank Common Stock"), surplus of $______, and retained earnings of
     $_______.

               (c)  Mercantile Financial Enterprises, Inc., Bank, and Norwest
     Corporation ("Norwest") have entered into an Agreement and Plan of
     Reorganization dated as of October __, 1998 (the "Reorganization
     Agreement"), which Reorganization Agreement contemplates the transactions
     to be effected by this Consolidation Agreement.

               (d)  A majority of the Boards of Directors of Interim Bank and of
     Bank have duly approved this Consolidation Agreement and authorized its
     execution.

               (e)  It is the intent of the parties hereto to effect a corporate
     reorganization which qualifies as a tax-free reorganization pursuant to
     Section 368(a)(1)(B) of the Internal Revenue Code.

                                   AGREEMENTS
                                        
          IN CONSIDERATION OF THE PREMISES,  Interim Bank and Bank make this
Consolidation Agreement and fix the terms and conditions of the Consolidation of
Interim Bank and Bank (the "Consolidation") as follows:

                                      B-1
<PAGE>
 
                                   SECTION 1
                                        
     1.1  Pursuant to the authority of and in accordance with the provisions of
12 U.S.C. 215, Interim Bank shall be consolidated with Bank, under the charter
of Bank (the "Consolidated Bank").

     1.2  The name of the Consolidated Bank shall be "Mercantile Bank, National
Association."

     1.3  The Consolidation shall be effective as of 12:01 a.m. on the date
specified in the certificate of approval to be issued by the Comptroller of the
Currency of the United States, under the seal of his office, approving the
Consolidation (the "Effective Date").

     1.4  The business of the Consolidated Bank shall be that of a national
banking association and shall be conducted at the main office of the
Consolidated Bank, which shall be located at 835 East Levee Street, Brownsville,
Cameron County, Texas 78520, and at its legally established branches.


                                   SECTION 2
                                        
     As of the Effective Date:

     2.1 The corporate existences of the Consolidating Banks shall be
consolidated into the Consolidated Bank.

     2.2  All rights, franchises, and interests of the Consolidating Banks
in and to every type of property (real, personal and mixed) and chooses in
action shall be transferred to and vested in the Consolidated Bank by virtue of
the Consolidation without any deed or other transfer.  The Consolidated Bank,
upon the Consolidation and without any order or other action on the part of any
court or otherwise, shall hold and enjoy all rights of property, franchises, and
interests, including appointments, designations, and nominations, and all other
rights and interests as trustee, executor, administrator, registrar of stocks
and bonds, guardian of estates, assignee, receiver, and in every other fiduciary
capacity, in the same manner and to the same extent as such rights, franchises,
and interests were held or enjoyed by either of the Consolidating Banks at the
time of Consolidation.

     2.3  The Consolidated Bank shall be liable for all liabilities of
every kind and description, including liabilities arising out of the operation
of a trust department, of each of the Consolidating Banks existing as of the
Effective Date.

     2.4  The amount of capital stock of the Consolidated Bank shall be
$________, divided into _____ shares of common stock, each of $____ par value,
and at the time the Consolidation shall become effective, the Consolidated Bank
shall have a surplus of

                                      B-2
<PAGE>
 
$________ and retained earnings which, when combined with the capital and
surplus, will be equal to the combined capital structures of the Consolidating
Banks as stated in the preamble of this Consolidation Agreement, adjusted,
however, for the results of operations, the payment of dividends, if any,
between __________, and the Effective Date, and the payment provided for in
Section 3.2 hereof.


                                   SECTION 3
                                        
     As of the Effective Date:

     3.1  [To conform to Reorganization Agreement]

     3.2  As soon as practicable after the consolidation becomes effective, each
holder of a certificate which, prior to the effective time of the consolidation,
represented shares of Bank Common Stock outstanding immediately prior to the
time of consolidation (other than shares held by Mercantile) shall be entitled,
upon surrender of such certificate for cancellation to Norwest Bank Minnesota,
National Association, as the designated agent of the Consolidated Bank (the
"Agent"), to receive a new certificate representing the number of whole shares
of Norwest Common Stock to which such holder shall be entitled on the basis
above set forth.  Until so surrendered each certificate which, immediately prior
to the time of consolidation, represented shares of Bank Common Stock shall not
be transferable on the books of the Consolidated Bank but shall be deemed
(except for the payment of dividends as provided below) to evidence only the
right to receive the number of whole shares of Norwest Common Stock issuable on
the basis above set forth; provided, however, that, until the holder of such
certificate shall have surrendered the same as above set forth, no dividend
payable to holders of record of Norwest Common Stock as of any date subsequent
to the effective date of consolidation shall be paid to such holder with respect
to the shares of Norwest Common Stock issuable in connection with the
consolidation, but, upon surrender and exchange thereof as herein provided,
there shall be paid by the Agent to the record holder of such certificate
representing Norwest Common Stock issued in exchange therefor an amount with
respect to such shares of Norwest Common Stock equal to all dividends that shall
have been paid or become payable to holders of record of Norwest Common Stock
between the effective date of the consolidation and the date of such exchange.

          3.3  The shares of Interim Bank outstanding immediately prior to the
time of Consolidation shall be converted into and exchanged for _______ shares
of the Consolidated Bank, plus cash in the amount of $120,000.

          3.4  From and after the Effective Date, there shall be no transfers on
the stock transfer books of the Consolidated Bank of the shares of Bank Common
Stock or Interim Bank Common Stock which were issued and outstanding immediately
prior to the Effective Date.

                                      B-3
<PAGE>
 
                                   SECTION 4
                                        
     4.1  As of the Effective Date, the Articles of Association of the
Consolidated Bank shall be the Articles of Association of Bank and shall read in
their entirety as set forth in Appendix A attached hereto, and the Consolidated
Bank shall be authorized under such Articles of Association to issue _______
shares of common stock, par value $____ per share.

     4.2  The by-laws of Bank as they exist at the Effective Date shall
continue in full force as the by-laws of the Consolidated Bank until altered,
amended, or repealed as provided therein or as provided by law.

     4.3  As of the Effective Date, the following named persons shall serve
as the Board of Directors of the Consolidated Bank until the next annual meeting
of the shareholders or until such time as their successors have been elected and
have qualified:

 
                           ________________________
                           ________________________
                           ________________________
 

     4.4  The officers of Bank holding office at the Effective Date shall
continue as the officers of the Consolidated Bank for the term prescribed in the
by-laws or until the Board of Directors otherwise shall determine.


                                   SECTION 5
                                        
     5.1 This Consolidation Agreement shall be submitted to the shareholders of
Bank and Interim Bank, respectively, for approval at meetings to be called and
held in accordance with the articles of association of Bank and the articles of
association of Interim Bank, and in accordance with applicable provisions of
law. Such approval by the shareholders shall require the affirmative vote of the
shareholders of each of the Consolidating Banks owning at least two-thirds of
its capital stock outstanding.

                                   SECTION 6
                                        
     6.1 The Consolidation shall be subject to and conditioned upon the
following:

          (a)  approval of this Consolidation Agreement by the shareholders of
     Bank and Interim Bank as required by law;

          (b)  approval of the Consolidation by all appropriate banking and
     regulatory authorities and the satisfaction of all other requirements
     prescribed by law necessary for consummation of the Consolidation; and

                                      B-4
<PAGE>
 
          (c)  satisfaction of the conditions precedent set forth in paragraphs
     6 and 7 of the Reorganization Agreement.

          6.2  At any time before the Effective Date, if any of the following
circumstances obtain, this Consolidation Agreement may be terminated, at the
election of Bank or Interim Bank, by written notice from the party so electing
to the other, or the consummation of the Consolidation may be postponed for such
period, and subject to such further rights of Bank and Interim Bank, or either
of them, to terminate this Consolidation Agreement as Bank and Interim Bank may
agree in writing:

          (a)  by mutual consent of the Boards of Directors of the Consolidating
     Banks if consummation of the Consolidation would be inadvisable in the
     opinion of said Boards; or

          (b)  by action of the Board of Directors of any party hereto if the
     Reorganization Agreement is terminated.

                                   SECTION 7
                                        
          7.1  Bank and Interim Bank, by mutual consent of their respective
Boards of Directors, may amend this Consolidation Agreement before the Effective
Date;  provided, however, that after this Consolidation Agreement has been
approved by the shareholders of Bank, no such amendment shall affect the rights
of such shareholders of Bank in a manner which is materially adverse to such
shareholders.

          7.2  This Consolidation Agreement may be executed in several
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

          IN WITNESS WHEREOF, Bank and Interim Bank have caused this
Consolidation Agreement to be executed by their respective duly authorized
officers and their corporate seals, if any, to be hereunto affixed as of the
date first above written, pursuant to a resolution of each Consolidating Bank's
Board of Directors, acting by a majority thereof.


(NO BANK SEAL)                NORWEST INTERIM BANK,
                                 NATIONAL ASSOCIATION
ATTEST:

                              By:__________________________________
                                  Its:_____________________________


_________________________
      Secretary


                                      B-5
<PAGE>
 
STATE OF TEXAS           )
                         ) ss
COUNTY OF_______________ )

     On this _____ day of __________, 19__, before me, a Notary Public for
the State and County aforesaid, personally came
_____________________________________, as _________________________________, and
_______________________________, as ________________________________, of NORWEST
INTERIM BANK, NATIONAL ASSOCIATION, and each in his or her said capacity
acknowledged the foregoing instrument to be the act and deed of said bank.

     WITNESS my official seal and signature this day and year aforesaid.

                              _____________________________________
(Seal of Notary)              Notary Public, _________________ County
                              My Commission Expires _______________


(BANK SEAL)                   MERCANTILE BANK,
                                 NATIONAL ASSOCIATION

ATTEST:
                              By:__________________________________
                                  Its:_____________________________


_________________________
      Secretary


STATE OF TEXAS         )
                       ) ss
COUNTY OF_____________ )

     On this _____ day of __________, 19__, before me, a Notary Public for
the State and County aforesaid, personally came
_____________________________________, as _________________________________, and
_______________________________, as ________________________________, of
MERCANTILE BANK, NATIONAL ASSOCIATION, and each in his or her said capacity
acknowledged the foregoing instrument to be the act and deed of said bank and
the seal affixed thereto to be its seal.

     WITNESS my official seal and signature this day and year aforesaid.


                              _____________________________________
(Seal of Notary)              Notary Public, _________________ County
                              My Commission Expires _______________

                                      B-6
<PAGE>
 
                                   APPENDIX C

                        OPINION OF ALEX SHESHUNOFF & CO.
                                        
<PAGE>
 
                              October 9, 1998


Board of Directors
Mercantile Bank, National Association
835 East Levee Street
Brownsville, Texas 78520
Members of the Board:

Alex Sheshunoff & Co. Investment Banking ("Sheshunoff") understands Mercantile
Financial Enterprises, Inc., Brownsville, Texas ("Mercantile"), a Delaware
corporation, Mercantile Bank, National Association, Brownsville, Texas (Bank"),
a national banking association and Norwest Corporation, Minneapolis, Minnesota
("Norwest"), a Delaware corporation, entered into an Agreement and Plan of
Reorganization (the "Agreement"), that provides, among other things, for the
acquisition of all of the capital stock of Mercantile by means of a merger of
Mercantile with and into a wholly owned subsidiary of Norwest (the "Merger").
You have requested our opinion as to the financial fairness to the holders of
minority interest common stock in the Bank of the exchange ratio by which Bank
minority shareholders will receive Norwest common stock in the Merger.  It is
our understanding that approximately 96% of the outstanding common stock of the
Bank is owned by Mercantile and approximately 4% of the outstanding common stock
of the Bank is owned by minority shareholders.

Pursuant to the Agreement at the Effective Time, each share of Mercantile Common
Stock, issued and outstanding prior to the effective time, excluding Dissenting
Shares, shall, by virtue of the Merger and without any action by the holder
thereof, be converted into a number of shares of Norwest Common Stock (the
"Exchange Ratio") as determined by:

     1.  Dividing the Merger Value by the "Norwest Measurement Price" and
         dividing the result thereof by the total number of shares of Mercantile
         common stock outstanding. The "Norwest Measurement Price" will equal
         the average of the closing prices of a share of Norwest Common Stock as
         reported on the consolidated tape of the New York Stock Exchange during
         the period of ten (10) trading days ending on the day immediately
         preceeding the meetings of the shareholders of Mercantile and the Bank
         (or the effective dates of any consent actions in lieu of meetings) for
         approval of the Merger; provided, however, if the average should fall
         below $37.00 or rise above $41.00, the "Norwest 
<PAGE>
 
         Measurement Price" will be deemed to equal $37.00 and $41.00,
         respectively, for the purpose of computing the Exchange Ratio.

     2.  Consolidation each share of Bank Common Stock other than dissenting
         shares and shares owned by Mercantile will be converted into and
         exchanged for a number of shares of Norwest determined as follows: (i)
         dividing the Bank Consolidation Value by the "Norwest Measurement
         Price" and (ii) dividing the result thereof by the total number of
         shares of Bank Common Stock then outstanding held by shareholders of
         the Bank other than Mercantile.

     3.  Merger Value means $174,000,000 minus the "Bank Consolidation Value";

     4.  Bank Consolidation Value equals the amount determined by (i) dividing
         the "Nominal Value" by $2,739,928 and (ii) multiplying the result
         thereof by 110,551;

     5.  Nominal Value shall mean $174,000,000 plus cash liabilities of
         Mercantile minus the cash assets of Mercantile as shown on Mercantile's
         statement of shareholders equity as of the month end immediately
         preceding the closing date.

In connection with our opinion, Sheshunoff has: (i.) reviewed a draft copy of
the Agreement; (ii.) reviewed certain publicly available financial statements
and other information of Mercantile, the Bank and Norwest, respectively; (iii.)
discussed with Mercantile's and the Bank's management the results of regulatory
examinations of Mercantile and the Bank; (iv.) reviewed certain estimates of
cost savings prepared by Mercantile and Bank management arising from the
transaction; (v.) reviewed certain internal financial statements and other
financial and operating data concerning Mercantile and the Bank; (vi.) analyzed
certain budget and financial projections of Mercantile and the Bank prepared by
the management of Mercantile and the Bank; (vii.) analyzed the pro forma impact
of the Merger on the combined company's earnings, book value and tangible book
value per share, respectively; (viii.) reviewed the reported prices and trading
activity for Norwest; (ix.) discussed the past and current operations and
financial condition, and the prospects of Mercantile and the Bank with executive
management; (x) compared Mercantile, the Bank and Norwest from a financial point
of view with certain other companies which Sheshunoff deemed to be relevant;
(xi.) reviewed the financial terms, to the extent publicly available, of certain
comparable merger transactions, and (xii.) performed such other analyses and
examinations as Sheshunoff has deemed appropriate.

Sheshunoff has assumed and relied upon without independent verification the
accuracy and completeness of the information supplied or otherwise made
available to us by Mercantile, the Bank and Norwest for the purposes of this
opinion.  Sheshunoff has not made an independent evaluation of the assets or
liabilities of Mercantile, the Bank nor Norwest, nor has Sheshunoff been
furnished with any such appraisals.  With respect to Mercantile's and the Bank's
budgets and financial forecasts, Sheshunoff has assumed that they have been
reasonably prepared and reflect the best currently available estimates and
judgments of management of Mercantile and the Bank, as to the future financial
performance of Mercantile and the Bank, and Sheshunoff has assumed such
forecasts and projections will be realized in 
<PAGE>
 
the amounts and at the times contemplated thereby. Sheshunoff has assumed that
obtaining any necessary regulatory approvals and third party consents for the
Merger or otherwise will not have an adverse effect on Mercantile, the Bank,
Norwest or the combined company pursuant to the Agreement. Sheshunoff is not an
expert in the evaluation of loan portfolios for the purpose of assessing the
adequacy of the allowance for losses with respect thereto and has assumed that
such allowances for each of the companies are in the aggregate, adequate to
cover such losses. In addition, Sheshunoff has not reviewed any individual
credit files or made an independent evaluation, appraisal or physical inspection
of the assets or individual properties of Mercantile, the Bank or Norwest, nor
has Sheshunoff been furnished with any such evaluations or appraisals.

Sheshunoff discussed with Mercantile and the Bank's management its recent
operating performance, future prospects, shareholder base and the lack of an
active trading market for its common stock, and its strategic plan.  We assumed
that Mercantile's and the Bank's budget and financial forecasts were reasonably
prepared and reflect the best currently available estimates and judgments of
management of Mercantile and the Bank, as to the future financial performance of
Mercantile and the Bank, and we assumed such forecasts and projections will be
realized in the amounts and at the times contemplated thereby.

Sheshunoff further assumed that in the course of obtaining the necessary
regulatory and third party consents for the Merger, no restriction will be
imposed that will have a material adverse effect on the contemplated benefits of
the Merger or the transactions contemplated thereby, and that the Merger will be
consummated in accordance with the terms of the Agreement, without any
amendments to, and without any waiver by Mercantile or the Bank of any of the
material conditions to its obligations thereunder.

Sheshunoff is not an expert in the evaluation of loan portfolios for the purpose
of assessing the adequacy of the allowance for losses with respect thereto and
assumed that such allowances for each of the companies are in the aggregate,
adequate to cover such losses.  In addition, Sheshunoff did not review any
individual credit files or make an independent evaluation, appraisal or physical
inspection of the assets or individual properties of Mercantile, the Bank or
Norwest, nor were we furnished with any such evaluations or appraisals.

Sheshunoff's opinion is necessarily based on economic, market and other
conditions as in effect on, and the information made available to it, as of the
date hereof.  Events occurring after the date hereof could materially affect the
assumptions used in preparing this opinion. Sheshunoff has also assumed that
there are no material changes in Mercantile's, the Bank's or Norwest's assets,
financial condition, results of operations, business or prospects since the
respective dates of their last financial statements reviewed by it, and that
off-balance sheet activities of Mercantile, the Bank and Norwest will not
materially and 
<PAGE>
 
adversely impact the future financial position or results of operation of
Mercantile, the Bank and Norwest. Sheshunoff has also assumed the Merger will be
completed as set forth in the Agreement and that no material changes will be
made or restrictions imposed by regulatory or other parties on the terms of the
Agreement.

Sheshunoff's opinion is limited to the fairness, from a financial point of view,
to the holders of Bank Common Stock of the Exchange Ratio and does not address
the Mercantile's and Bank's underlying business decision to undertake the
Merger.  Sheshunoff expresses no opinion as to the financial fairness of the
Merger or Exchange Ratio to shareholders of Mercantile.  Moreover, this letter,
and the opinion expressed herein, does not constitute a recommendation to any
stockholder as to any approval of the Merger or the Agreement.  It is understood
that this letter is for the information of the Board of Directors of the Bank
and may not be used for any other purpose without Sheshunoff's prior written
consent, except that this opinion may be included in its entirety in any filing
made by Mercantile and the Bank or Norwest with the Securities and Exchange
Commission with respect to the Merger.

Mercantile retained Sheshunoff to assist it in soliciting offers for the
possible acquisition of Mercantile from potential acquirers.  Sheshunoff will
receive a fee for providing investment banking services to Mercantile and the
Bank including the preparation of this opinion.

Based upon and subject to the foregoing, Sheshunoff is of the opinion that, as
of the date hereof, the Exchange Ratio to be received by the Bank's Common
stockholders is fair from a financial point of view to the holders of such
shares.

                                 Very truly yours,


                                 /s/Alex Sheshunoff & Co. Investment Banking

                                 ALEX SHESHUNOFF & CO.
                                 INVESTMENT BANKING
<PAGE>
 
                                   APPENDIX D

         UNITED STATES CODE TITLE 12, SECTION 215, PARAGRAPHS (b) - (d)
                                        
<PAGE>
 
 (S)  215.  Consolidation of national banks or State banks with national banks

                             **********************

(b)  Liability of consolidated association; capital stock; dissenting
     shareholders

          The consolidated association shall be liable for all liabilities of
the respective consolidating banks or associations.  The capital stock of such
consolidated association shall not be less than that required under existing law
for the organization of a national bank in the place in which it is located:
Provided, That if such consolidation shall be voted for at such meetings by the
necessary majorities of the shareholders of each association and State bank
proposing to consolidate, and thereafter the consolidation shall be approved by
the Comptroller, any shareholder of any of the associations or State banks so
consolidated who has voted against such consolidation at the meeting of the
association or bank of which he is a stockholder or who has given notice in
writing at or prior to such meeting to the presiding officer that he dissents
from the plan of consolidation, shall be entitled to receive the value of the
shares so held by him when such consolidation is approved by the Comptroller
upon written request made to the consolidated association at any time before
thirty days after the date of consummation of the consolidation, accompanied by
the surrender of his stock certificates.

(c)  Valuation of shares

          The value of the shares of any dissenting shareholder shall be
ascertained, as of the effective date of the consolidation, by an appraisal made
by a committee of three persons, composed of (1) one selected by the vote of the
holders of the majority of the stock, the owners of which are entitled to
payment in cash; (2) one selected by the directors of the consolidated banking
association; and (3) one selected by the two so selected.  The valuation agreed
upon by any two of the three appraisers shall govern.  If the value so fixed
shall not be satisfactory to any dissenting shareholder who has requested
payment, that shareholder may, within five days after being notified of the
appraised value of his shares, appeal to the Comptroller, who shall cause a
reappraisal to be made which shall be final and binding as to the value of the
shares of the appellant.

(d)  Appraisal by the Comptroller; expenses of consolidated association; sale
     and resale of shares; State appraisal and consolidation law

          If, within ninety days from the date of consummation of the
consolidation, for any reason one or more of the appraisers is not selected as
herein provided, or the appraisers fail to determine the value of such shares,
the Comptroller shall upon written request of any interested party cause an
appraisal to be made which shall be final and binding on all parties.  The
expenses of the Comptroller in making the reappraisal or the appraisal, as the
case may be, shall be paid by the consolidated banking association.  The value
of the shares ascertained shall be promptly paid to the dissenting shareholders
by the consolidated banking association.  Within thirty days after payment has
been made to all dissenting shareholders as provided for in this section the
shares of stock of the consolidated banking association which would have been
delivered to such dissenting shareholders had they not requested payment shall
be sold by the consolidated banking association at an advertised public auction,
unless some other method of sale is approved by the Comptroller, and the
consolidated banking association shall have the rights to purchase any of such
shares at such public auction, if it is the highest bidder therefor, for the
purpose of reselling such shares within thirty days thereafter to such person or
persons and at such price not less than par as its board of directors by
resolution may determine.  If the shares are sold at public auction at a price
greater than the amount paid to the dissenting shareholder the excess in such
sale price shall be paid to such shareholders.  The appraisal of such shares of
stock in any State bank shall be determined in the manner prescribed by the law
of the State in such cases, rather than as provided in this section, if such
provision is made in the State law; and no such consolidation shall be in
contravention of the law of the State under which such bank is incorporated.

                                      D-1
<PAGE>
 
                                   APPENDIX E
                                        
                          OCC- BANKING CIRCULAR BC-259

                                STOCK APPRAISALS
<PAGE>
 
OCC-BC-259 Stock Appraisals

Comptroller of the Currency                     BC 259
Administrator of National Banks

Type:  Banking Circular          Subject:  Stock Appraisals

TO:  Chief Executive Officers of National Banks, Deputy
     Comptrollers (District), Department and Division Heads,
     and Examining Personnel

PURPOSE

This Banking Circular informs all national banks of the valuation methods used
by the Office of the Comptroller of the Currency (OCC) to estimate the value of
a bank's shares when requested to do so by a shareholder dissenting to the
conversion, merger, or consolidation of its bank.  The results of appraisals
performed by the OCC between January 1, 1985, and September 30, 1991 are
summarized.

References:  12 U.S.C. 214a, 215 and 215a; 12 CFR 11.590 (Item 2)

BACKGROUND

Under 12 U.S.C. Section 214a, a shareholder dissenting from a conversion,
consolidation, or merger involving a national bank is entitled to receive the
value of his or her shares from the resulting bank.  A valuation of the shares
shall be made by a committee of three appraisers (a representative of the
dissenting shareholder, a representative of the resulting bank, and a third
appraiser selected by the other two).  If the committee is formed and renders an
appraisal that is acceptable to the dissenting shareholder, the process is
complete and the appraised value of the shares is paid to the dissenting
shareholder by the resulting bank.  If, for any reason, the committee is not
formed or if it renders an appraisal that is not acceptable to the dissenting
shareholder, an interested party may request an appraisal by the OCC. 12 U.S.C.
Section 215 provides these appraisal rights to any shareholder dissenting to a
consolidation.  Any dissenting shareholder of a target bank in a merger is also
entitled to these appraisal rights pursuant to 12 U.S.C. Section 215a.

The above provides only a general overview of the appraisal process.  The
specific requirements of the process are set forth in the statutes themselves.

METHODS OF VALUATION USED

Through its appraisal process, the OCC attempts to arrive at a fair estimate of
the value of a bank's shares.  After reviewing the particular facts in each case
and the available information on a bank's shares, the OCC selects an appropriate
valuation method, or combination of methods, to determine a reasonable estimate
of the shares' value.

                                      E-1
<PAGE>
 
Market Value

The OCC uses various methods to establish the market value of shares being
appraised.  If sufficient trading in the shares exists and the prices are
available from direct quotes from the Wall Street Journal or a market-maker,
those quotes are considered in determining the market value.  If no market value
is readily available, or if the market value available is not well established,
the OCC may use other methods of estimating market value, such as the investment
value and adjusted book value methods.

Investment Value

Investment value requires an assessment of the value to investors of a share in
the future earnings of the target bank.  Investment value is estimated by
applying an average price/earnings ratio of banks with similar earnings
potential to the earnings capacity of the target bank.

The peer group selection is based on location, size, and earnings patterns.  If
the state in which the subject bank is located provides a sufficient number of
comparable banks using location, size and earnings patterns as the criteria for
selection, the price/earnings ratios assigned to the banks are applied to the
earnings per share estimated for the subject bank.  In order to select a
reasonable peer group when there are too few comparable independent banks in a
location that is comparable to that of the subject bank, the pool of banks from
which a peer group is selected is broadened by including one-bank holding
company banks in a comparable location, and/or by selecting banks in less
comparable locations, including adjacent states, that have earnings patterns
similar to the subject bank.

Adjusted Book Value

The OCC also uses an "adjusted book value" method for estimating value.
Historically, the OCC has not placed any weight on the bank's "unadjusted book
value", since that value is based on historical acquisition costs of the bank's
assets, and does not reflect investors' perceptions of the value of the bank as
an ongoing concern.  Adjusted book value is calculated by multiplying the book
value of the target bank's assets per share times the average market price to
book value ratio of comparable banking organizations.  The average market price
to book value ratio measures the premium or discount to book value, which
investors attribute to shares of similarly situated banking organizations.

Both the investment value method and the adjusted book value method present
appraised values which are based on the target bank's value as a going concern.
These techniques provide estimates of the market value of the shares of the
subject bank.

OVERALL VALUATION

The OCC may use more than one of the above-described methods in deriving the
value of shares of stock.  If more than one method is used, varying weights may
be applied in reaching an overall valuation.  The weight given to the value by a
particular valuation method is based on how accurately the given method is
believed to represent market value.  For example, the OCC may give more weight
to a market value representing infrequent trading by shareholders than to the
value derived from the investment value method when the subject bank's earnings
trend is so irregular that it is considered to be a poor predictor of future
earnings.

                                      E-2
<PAGE>
 
PURCHASE PREMIUMS

For mergers and consolidations, the OCC recognizes that purchase premiums do
exist and may, in some instances, be paid in the purchase of small blocks of
shares.  However, the payment of purchase premiums depends entirely on the
acquisition or control plans of the purchasers, and such payments are not
regular or predictable elements of market value. Consequently, the OCC's
valuation methods do not include consideration of purchase premiums in arriving
at the value of shares.

STATISTICAL DATA

The chart below lists the results of appraisals the OCC performed between
January 1, 1985 and September 30, 1991.  The OCC provides statistical data on
book value and price/earnings ratios for comparative purposes, but does not
necessarily rely on such data in determining the value of the banks' shares.
Dissenting shareholders should not view these statistics as determinative for
future appraisals.

In connection with disclosures given to shareholders under 12 CFR 11.590 (Item
2), banks may provide shareholders a copy of this Banking Circular or disclose
the information in the Banking Circular, including the past results of OCC
appraisals.  If the bank discloses the past results of the OCC appraisals, it
should advise shareholders that: (1) the OCC did not rely on all the information
set forth in the chart in performing each appraisal; and (2) the OCC's past
appraisals are not necessarily determinative of its future appraisals of a
particular bank's shares.

APPRAISAL RESULTS
<TABLE>
<CAPTION>
 
                           OCC                                                    Average Price/
     Appraisal          Appraisal             Price                Book           Earnings Ratio
       Date               Value              Offered              Value           of Peer Group
- ------------------  ------------------  ------------------  ------------------  ------------------
<S>                 <C>                 <C>                 <C>                 <C>
 
          1/1/85                107.05              110.00              178.29                 5.3
          1/2/85                 73.16                  NA               66.35                 6.8
         1/15/85                 53.41               60.00               83.95                 4.8
         1/31/85                 22.72               20.00               38.49                 5.4
          2/1/85                 30.63               24.00               34.08                 5.7
         2/25/85                 27.74               27.55               41.62                 5.9
         4/30/85                 25.98               35.00               42.21                 4.5
         7/30/85              3,153.10            2,640.00            6,063.66                  NC
          9/1/85                 17.23               21.00               21.84                 4.7
        11/22/85                316.74              338.75              519.89                 5.0
        11/22/85                 30.28                  NA               34.42                 5.9
        12/16/85                 66.29               77.00               89.64                 5.6
        12/27/85                 60.85               57.00              119.36                 5.3
        12/31/85                 61.77                  NA               73.56                 5.9
        12/31/85                 75.79               40.00               58.74                12.1
         1/12/86                 19.93                  NA               26.37                 7.0
         3/14/86                 59.02              200.00              132.20                 3.1
         4/21/86                 40.44               35.00               43.54                 6.4
          5/2/86                 15.50               16.50               23.69                 5.0

</TABLE>

                                      E-3
<PAGE>

<TABLE>
<CAPTION>

<S>                     <C>                <C>                  <C>                 <C> 
          7/3/86                405.74                  NA              612.82                 3.9
         7/31/86                297.34              600.00              650.63                 4.4
         8/22/86                103.53              106.67              136.23                  NC
        12/26/86                 16.66                  NA               43.57                 4.0
        12/31/86                 53.39               95.58               69.66                 7.1
          5/1/87                186.42                  NA              360.05                 5.1
         6/11/87                 50.46               70.00               92.35                 4.5
         6/11/87                 38.53               55.00               77.75                 4.5
         7/31/87                 13.10                  NA               20.04                 6.7
         8/26/87                 55.92               57.52               70.88                  NC
         8/31/87                 19.55               23.75               30.64                 5.0
         8/31/87                 10.98                  NA               17.01                 4.2
         10/6/87                 56.48               60.00               73.11                 5.6
         3/15/88                297.63                  NA              414.95                 6.1
          6/2/88                 27.26                  NA               28.45                 5.4
         6/30/88                137.78                  NA              215.36                 6.0
         8/30/88                768.62              677.00            1,090.55                10.7
         3/31/89                773.62                  NA              557.30                 7.9
         5/26/89                136.47              180.00              250.42                 4.5
         5/29/90                  9.87                  NA               11.04                 9.9

</TABLE>

* - The "Appraisal Date" is the consummation date for the conversion,
    consolidation, or merger.
NA - Not Available           NC - Not Computed

For more information regarding the OCC's stock appraisal process, contact the
Office of the Comptroller of the Currency, Bank Organization and Structure.


Frank Maguire
Acting Senior Deputy Comptroller
Corporate Policy and Economic Analysis

Date:  March 10, 1992

                                      E-4
<PAGE>
 
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 20.  Indemnification of Directors and Officers

Section 145 of the Delaware General Corporation Law authorizes indemnification
of directors and officers of a Delaware corporation under certain circumstances
against expenses, judgments and the like in connection with an action, suit or
proceeding.  Article Fourteenth of Wells Fargo's Restated Certificate of
Incorporation provides for broad indemnification of directors and officers.

Item 21.  Exhibits and Financial Statement Schedules

(a)  Exhibits.  See Exhibit Index.

(b)  Financial Statement Schedules.  Not Applicable.

(c)  Report, Opinion or Appraisal.  See Exhibits 5 and 8.

Item 22.  Undertakings

  (a) The undersigned registrant hereby undertakes:

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

        (i) To include any prospectus required by section 10(a)(3) of the
        Securities Act of 1933.

        (ii) To reflect in the prospectus any facts or events arising after the
        effective date of the registration statement (or the most recent
        posteffective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the registration statement.  Notwithstanding the foregoing, any
        increase or decrease in volume of securities offered (if the total
        dollar value of securities offered would not exceed that which was
        registered) and any deviation from the low or high end of the estimated
        maximum offering range may be reflected in the form of prospectus filed
        with the Commission pursuant to Rule 424(b) ((S)230.424(b) of this
        chapter) if, in the aggregate, the changes in volume and price represent
        no more than 20% change in the maximum offering price set forth in the
        "Calculation of Registration Fee" table in the effective registration
        statement.

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

    (2) That, for the purpose of determining any liability under the Securities
        Act of 1933, each such posteffective 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.

    (3) To remove from registration by means of a posteffective amendment any
        of the securities being registered which remain unsold at the
        termination of the offering.
<PAGE>
 
  (b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

  (c) The undersigned registrant hereby undertakes as follows: 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 registrant 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 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 of 1933, each such post-effective amendment shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

  (e) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 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 than the payment by the registrant of expenses
incurred or paid by a director, officer, or controlling person of the registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer, or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit 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.


                                      II-2
<PAGE>
 
                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused the Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Minneapolis, State of
Minnesota, on February 2, 1999.

                              WELLS FARGO & COMPANY

                              By:  /s/ Richard M. Kovacevich
                                   -------------------------
                                 Richard M. Kovacevich
                                 President and Chief Executive Officer

   Pursuant to the requirements of the Securities Act of 1933, the Registration
Statement has been signed on February 2, 1999 by the following persons in the
capacities indicated:

/s/ Richard M. Kovacevich          President and Chief Executive Officer
- -------------------------          (Principal Executive Officer)
    Richard M. Kovacevich             

/s/ Rodney L. Jacobs               Vice Chairman and Chief Financial Officer
- -------------------------          (Principal Financial Officer)
    Rodney L. Jacobs                  

/s/ Les L. Quock                   Senior Vice President and Controller
- -------------------------          (Principal Accounting Officer)
    Les L. Quock                   

LES S. BILLER        )
J.A. BLANCHARD III   )
DAVID A. CHRISTENSEN )
SUSAN E. ENGEL       )
WILLIAM A. HODDER    )
RODNEY L. JACOBS
REATHA CLARK KING    )                  A majority of the
RICHARD M. KOVACEVICH)                  Board of Directors*
RICHARD D. McCORMICK )
CYNTHIA H. MILLIGAN  )
BENJAMIN F. MONTOYA  )
IAN M. ROLLAND       )
MICHAEL W. WRIGHT    )

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

*Richard M. Kovacevich, by signing his name hereto, does hereby sign this
document on behalf of each of the directors named above pursuant to powers of
attorney duly executed by such persons.

                                   /s/ Richard M. Kovacevich
                                   -------------------------
                                     Richard M. Kovacevich
                                     Attorney-in-Fact



                                      II-3
<PAGE>
 
<TABLE>
<CAPTION>

                               INDEX TO EXHIBITS
Exhibit                                                                          Form of
Number                  Description                                              Filing
- ------                  -----------                                              ------
<S>    <C>                                                                       <C>
 2.1   Agreement and Plan of Reorganization dated October 28, 1998 between
       Mercantile Financial Enterprises, Inc. , Mercantile Bank, National
       Association, and Norwest Corporation (now named Wells Fargo & Company)
       (included in Proxy Statement-Prospectus as Appendix A).

 3.1   Restated Certificate of Incorporation, as amended (incorporated by
       reference to Exhibit 3(b) to Wells Fargo's Current Report on Form 8-K
       dated June 28, 1993, Exhibit 3 to Wells Fargo's Current Report on Form 8-
       K dated July 3, 1995, Exhibit 3 to Wells Fargo's Current Report on Form
       8-K dated June 3, 1997, Exhibit 3 to Wells Fargo's Current Report on Form
       8-K dated June 8, 1998 and Exhibits 3(b) and 3(c) to Wells Fargo's
       Quarterly Report on Form 10-Q for the quarter ended September 30, 1998.

 3.1.1 Certificate of Designations of Powers, Preferences, and Rights of Norwest
       ESOP Cumulative Convertible Preferred Stock (incorporated by reference to
       Exhibit 4 to Norwest's Quarterly Report on Form 10-Q for the quarter
       ended March 31, 1994).

 3.1.2 Certificate of Designations of Powers, Preferences, and Rights of
       Wells Fargo Cumulative Tracking Preferred Stock (incorporated by
       reference to Exhibit 3 to Norwest's Current Report on Form 8-K dated
       January 9, 1995).

 3.1.3 Certificate of Designations of Powers, Preferences, and Rights of
       Norwest 1995 ESOP Cumulative Convertible Preferred Stock (incorporated by
       reference to Exhibit 4 to Norwest's Quarterly Report on Form 10-Q for the
       quarter ended March 31, 1995).

 3.1.4 Certificate of Designations with respect to the 1996 ESOP Cumulative
       Convertible Preferred Stock (incorporated by reference to Exhibit 3 to
       Norwest's Current Report on Form 8-K dated November 26, 1996).

 3.1.5 Certificate of Designations with respect to the 1997 ESOP Cumulative
       Convertible Preferred Stock (incorporated by reference to Exhibit 3 to
       Norwest's Current Report on Form 8-K dated April 14, 1997).

 3.1.6 Certificate of Designations with respect to the 1998 ESOP Cumulative
       Convertible Preferred Stock (incorporated by reference to Exhibit 3 to
       Norwest's Current Report on Form 8-K dated April 20, 1998).

 3.1.7 Certificate of Designations for Adjustable Cumulative Preferred Stock,
       Series B (incorporated by reference to Exhibit 3(j) to Wells Fargo's
       Quarterly Report on Form 10-Q for the quarter ended September 30, 1998).

 3.1.8 Certificate of Designations for Fixed/Adjustable Rate Noncumulative
       Preferred Stock, Series H (incorporated by reference to Exhibit 3(k) to
       Wells Fargo's Quarterly Report on Form 10-Q for the quarter ended
       September 30, 1998.

 3.2   By-Laws (incorporated by reference to Exhibit 3(l) to Wells Fargo's
       Quarterly Report on Form 10-Q for the quarter ended September 30, 1998.
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>

Exhibit                                                                          Form of
Number                  Description                                              Filing
- ------                  -----------                                              ------
<S>    <C>                                                                       <C>
4.1     Rights Agreement, dated as of October 21, 1998, between Norwest 
        Corporation and ChaseMellon Shareholder Services, L.L.C., as
        Rights Agent (incorporated by reference to Exhibit 4.1 to Wells
        Fargo's Form 8-A dated October 21, 1998).
 
5       Opinion of Stanley S. Stroup.                                           Electronic
                                                                               Transmission

8       Form of Tax Opinion of Kilpatrick Stockton LLP                          Electronic
                                                                               Transmission
 
23.1    Consent of Stanley S. Stroup (included as part of
        Exhibit 5)                                            
 
23.2    Consent of KPMG LLP.                                                    Electronic
                                                                               Transmission
 
23.3    Consent of Burton, McCumber & Cortez LLP                                Electronic
                                                                               Transmission
 
23.4    Consent of Kilpatrick Stockton LLP                                      Electronic
                                                                               Transmission

23.5    Consent of Alex Sheshunoff & Co.                                        Electronic
        Investment Banking                                                     Transmission

24      Powers of Attorney.                                                     Electronic
                                                                               Transmission

99      Form of proxy for Special Meeting of Shareholders                       Electronic
        of Mercantile Bank, National Association                               Transmission
</TABLE>


<PAGE>
 
                                                                       EXHIBIT 5
                                                                                


                     [LETTERHEAD OF WELLS FARGO & COMPANY]


February 2, 1999



Board of Directors
Wells Fargo & Company
633 Folsom Street
7th Floor
San Francisco, California 94107-3600

Ladies and Gentlemen:

     In connection with the proposed registration under the Securities Act of
1933, as amended, of a maximum of up to 5,000,000 shares of common stock, par
value $1-2/3 per share, of Wells Fargo & Company , a Delaware corporation (the
"Company"), and associated preferred stock purchase rights (such shares and
rights collectively the "Shares"), which are proposed to be issued by the
Company in connection with (i) the merger (the "Merger") of a wholly-owned
subsidiary of the Company with Mercantile Financial Enterprises, Inc.,
("Mercantile"); and (ii) the consolidation of Mercantile Bank, N.A. (the "Bank")
with an interim national bank under the name and charter of the Bank
(collectively, the "Transactions"), I have examined such corporate records and
other documents, including the Registration Statement on Form S-4 relating to
the Shares, and have reviewed such matters of law as I have deemed necessary for
this opinion, and I advise you that in my opinion:

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

     2. All necessary corporate action on the part of the Company has been taken
to authorize the issuance of the Shares in connection with the Transactions and,
when issued as described in the Registration Statement, the Shares will be
legally and validly issued, fully paid and nonassessable.

     I consent to the filing of this opinion as an exhibit to the Registration
Statement.

                              Very truly yours,


                              /s/ Stanley S. Stroup

                                  Stanley S. Stroup
                                  Executive Vice President
                                     and General Counsel

<PAGE>
 
                                                                       EXHIBIT 8
                              FORM OF TAX OPINION


                    [LETTERHEAD OF KILPATRICK STOCKTON LLP]


_____________ ___, 1999                              
                                                                                


Mercantile Financial Enterprises, Inc.
c/o Mercantile Bank, National Association
835 East Levee Street
Brownsville, Texas 78520


Ladies and Gentlemen:

   We have been requested to render our opinion of the tax consequences to
various participants in the proposed merger (the "Mercantile Merger") of a
newly-formed, wholly-owned subsidiary ("Transition Subsidiary") of Wells Fargo &
Company, a Delaware corporation ("Wells Fargo"), with and into Mercantile
Financial Enterprises, Inc. ("Mercantile"), a Delaware corporation, with
Mercantile being the surviving entity, as well as the subsequent consolidation
(the "Consolidation") of Mercantile Bank, National Association ("Bank"), a
national banking association, with a wholly-owned national bank subsidiary of
Wells Fargo, pursuant to the terms and conditions of the following agreements:

   (i) that certain Agreement and Plan of Reorganization ("the Reorganization
Agreement") by and between Mercantile, Bank, and Wells Fargo;

   (ii) that certain Agreement and Plan of Merger ("the Merger Agreement")
between Mercantile and Transition Subsidiary; and

   (iii) that certain Agreement and Plan of Consolidation ("the Consolidation
Agreement") between Bank and Norwest Interim Bank Mercantile, N.A. ("Norwest 
Interim Bank").

   We have also reviewed that certain Registration Statement (Form S-4) related
to shares of Wells Fargo Common Stock to be issued in connection with the merger
of Transition Subsidiary into Mercantile, to be filed by Wells Fargo with the
Securities and Exchange Commission (the "Registration Statement").  Unless
otherwise indicated, terms used herein shall have the same meaning as defined in
the Registration Statement.

   In rendering our opinion, we have examined the Reorganization Agreement, the
Merger Agreement, the Consolidation Agreement, the Registration Statement,
applicable law, regulations, rulings and decisions.
<PAGE>
 
   Our opinions set forth below are subject to certain assumptions and
qualifications.  As to various factual matters that are material to our opinions
set forth herein, we have relied upon the factual representations and warranties
set forth in the Reorganization Agreement, the Merger Agreement, the
Consolidation Agreement, Registration Statement, and related documents.  We have
not independently verified, nor do we assume any responsibility for, the factual
accuracy or completeness of any such representations, warranties, statements, or
certificates.

FACTS
- -----

     The Mercantile Merger

     Pursuant to the Reorganization Agreement, Transition Subsidiary, a wholly
owned subsidiary of Wells Fargo, will merge with and into Mercantile, wherein
Mercantile will be the surviving corporation.  The holders of Mercantile stock
will receive Wells Fargo Common Stock in exchange for their shares of Mercantile
Stock.  Immediately following the merger of Transition Subsidiary into
Mercantile, Mercantile, as the surviving corporation, will be a wholly-owned
subsidiary of Wells Fargo.  Further, Wells Fargo will be a second tier parent of
Bank in that Mercantile owns approximately 96% of Bank.

     The Consolidation

     Immediately following the Mercantile Merger, Wells Fargo will, pursuant to
the Consolidation Agreement, form a wholly-owned national bank subsidiary
("Wells Fargo Interim Bank") and contribute Norwest Interim Bank to Mercantile.
Wells Fargo Interim Bank will consolidate with Bank (under Bank's name and
charter in the Consolidation), wherein Bank will be the surviving corporation.
The holders of Bank Stock will receive Wells Fargo Common Stock in exchange for
their shares of Bank Stock. Immediately following the Consolidation, Bank will
be a wholly-owned subsidiary of Mercantile.

OPINION
- -------

     The opinion expressed herein is based on the provisions of the Internal
Revenue Code of 1986, as amended through the date of this letter (the "Code"),
the applicable existing and proposed regulations thereunder (the "Regulations"),
existing judicial decisions, and current administrative rulings and practice.
No assurance can be given that legislative or administrative changes may not be
forthcoming and that such changes would not modify the opinion or discussion
contained in this letter.  There is also no assurance that the Internal Revenue
Service (the "Service") will not challenge the conclusions expressed herein.
Our opinion represents our best legal judgment on matters which may be subject
to varying interpretations.  It 
<PAGE>
 
has no binding effect on the Service or a court and should not be considered as
a guarantee that a court of law or administrative agency will reach the same
conclusions.

     Based on and in reliance on the foregoing and the further reasons and
qualifications set forth below, and provided that the Mercantile Merger and
Consolidation is consummated in accordance with the Reorganization Agreement, it
is our opinion that:

          (1)  The Mercantile Merger and the issuance of shares of Wells Fargo
               Common Stock to the holders of Mercantile Stock in connection
               therewith, as described in the Reorganization Agreement, will
               constitute a tax-free reorganization within the meaning of
               sections 368(a)(1)(A) and 368(a)(2)(E) of the Code.

          (2)  Except for the recognition of gain as required by section 302 of
               the Code with respect to the receipt by the holders of Mercantile
               Stock of cash in lieu of the issuance of fractional shares of
               Wells Fargo Common Stock, no gain or loss will be recognized by
               holders of Mercantile Stock as a result of the Mercantile Merger.

          (3)  The aggregate tax basis of the shares of Wells Fargo Common Stock
               received by a holder of Mercantile Stock pursuant to the
               Mercantile Merger will be the same as the tax basis of the shares
               of Mercantile Stock exchanged therefor, decreased by any portion
               of such tax basis allocated to shares of Mercantile Stock that
               are treated as redeemed by Mercantile through payment of cash in
               lieu of fractional shares.

          (4)  The holding period of the shares of Wells Fargo Common Stock
               received by a holder of Mercantile Stock as part of the
               Mercantile Merger will include the holding period of the shares
               of Mercantile Stock exchanged therefor, provided that the
               Mercantile Stock is held as a capital asset on the date of
               consummation of the Mercantile Merger.

          (5)  The Consolidation of Bank and the issuance of Wells Fargo Common
               Stock to the holders of Bank stock in connection therewith, as
               described in the Reorganization Agreement, will constitute a tax-
               free reorganization within the meaning of section 368(a)(1)(B) of
               the Code.

          (6)  Except for the recognition of gain as required by section 302 of
               the Code with respect to the receipt by the holders of Bank Stock
               of cash in lieu of the issuance of 
<PAGE>
 
               fractional shares of Wells Fargo Common Stock, no gain or loss
               will be recognized by holders of Bank Stock as a result of the
               Consolidation.

          (7)  The aggregate tax basis of the shares of Wells Fargo Common Stock
               received by a holder of Bank Stock pursuant to the Consolidation
               will be the same as the tax basis of the shares of Bank Stock
               exchanged therefor, decreased by any portion of such tax basis
               allocated to shares of Bank Stock that are treated as redeemed by
               Bank.

          (8)  The holding period of the shares of Wells Fargo Common Stock
               received by a holder of Bank Stock as part of the Consolidation
               will include the holding period of the shares of Bank Stock
               exchanged therefor, provided that the Bank Stock is held as a
               capital asset on the date of consummation of the Consolidation.
 
     In general, cash received by holders of Mercantile or Bank Stock exercising
their dissenters' rights will be treated as amounts received from the sale of
their shares of Mercantile or Bank Stock, and (provided that such Mercantile or
Bank Stock is a capital asset in the hands of such shareholders) each such
shareholder will recognize capital gain or loss (short or long term, as
appropriate) measured by the difference between the sale price of such
Mercantile or Bank Stock and such shareholder's tax basis in such Mercantile or
Bank Stock.

     We express no opinion as to the following: (a) the tax consequences that
might be relevant to a particular holder of Mercantile or Bank Stock who is
subject to special treatment under certain federal income tax laws, such as
dealers in securities, banks, insurance companies, tax-exempt organizations,
non-United States persons, persons who do not hold their Mercantile or Bank
Stock as "capital assets" within the meaning of section 1221 of the Code, and
persons who acquired their Mercantile or Bank Stock pursuant to the exercise of
options or otherwise as compensation, or (b) any consequences arising under the
laws of any state, locality, or foreign jurisdiction.

DISCUSSION
- ----------

     Considered as separate transactions, both the Mercantile Merger and the
Consolidation qualify as tax-free reorganizations under Code section 368.  An
issue, however, may be raised as to whether the two reorganizations, when
analyzed as a prearranged series of transactions, necessitates a
recharacterization of the tax consequences.  An argument could be made that,
notwithstanding the independent qualification of each transaction as a
reorganization, when viewed together, a tax result occurs that was not
contemplated by the reorganization provisions of the Code.  The basis for such
an argument would likely be based on the principle 
<PAGE>
 
that a tax-free transaction that cannot be accomplished in a single step may not
be accomplished in multiple steps.

     The result of Mercantile Merger and Consolidation is that the holders of
Mercantile and Bank Stock each eliminate their direct ownership interest in
those corporations and obtain Wells Fargo Common Stock, all without incurring
tax liability (other than  to the extent cash was received in exchange for
fractional shares or as a result of the exercise of dissenter's rights).  In the
absence of the two transactions, either Mercantile stockholders or Bank
stockholders can participate in a reorganization with Wells Fargo, but not both.
The Code does not simultaneously permit the shareholders of a corporation that
is a party to a reorganization, as well as the unrelated shareholders of a
subsidiary of that corporation, to each receive stock tax-free.  Most likely, an
argument based on this analysis would assert that the receipt of Wells Fargo
stock by holders of Bank Stock was taxable in that these shareholders did not
qualify under Code section 354 to receive this stock tax-free as a party to the
reorganization.  The holders of Bank Stock would arguably be deemed to have
exchanged directly their Bank Stock for Wells Fargo Stock in a taxable
transaction.  Assuming the Bank Stock was held as a capital asset, as defined in
Code section 1221, this sale would give rise to capital gain.

     While the above or an alternative analysis of the series of transactions is
possible, it is unlikely that any such analysis would alter the tax consequences
stated in this opinion.  Revenue Ruling 73-16, 1973-1 C.B. 186, discussed the
tax treatment of a series of two reorganizations where both were part of a
prearranged plan.  In the Revenue Ruling, Y corporation acquired all of the
stock of X corporation solely in exchange for Y voting stock.  Immediately
thereafter, pursuant to a prearranged plan, all of the stock of Y was acquired
by Z solely in exchange for Z stock.  The Service determined that each
transaction qualified as a tax-free reorganization under Code section
368(a)(1)(B).  In fact, the Service indicated that the two transactions were
treated as occurring simultaneously and, as a result of the prearranged plan,
could not be considered independently.  Thus, the Service's recognition of back-
to-back prearranged reorganizations supports the recognition of the Mercantile
Merger as well as the subsequent Consolidation.

     Further, a 1997 private letter ruling (PLR 9740014) issued by the Service
supports the concept of prearranged back-to-back reorganizations.  Under the
facts in the private letter ruling, the acquiring corporation ("Acquiring"), a
national banking association, planned to acquire both Target Corporation
("Target") and its subsidiary, Subsidiary Corporation ("Subsidiary").
Subsidiary had three minority shareholders in addition to Target, its majority
shareholder.  Acquiring acquired all of the stock of Target solely in exchange
for Acquiring stock.  The result of this transaction is that Target became a
wholly-owned subsidiary of Acquiring.  Immediately following this acquisition,
as part of the same prearranged plan, Acquiring contributed Acquiring stock to
Target so that Target could exchange those Acquiring shares for the minority
interests held by Subsidiary minority shareholders.  Following this transaction,
Subsidiary was a wholly-owned subsidiary of Target.
<PAGE>
 
     The plan in this ruling is similar to that to be undertaken pursuant to the
Reorganization Agreement.  Much like the case of Mercantile and Bank, had
Acquiring attempted to merely issue its stock to both Target and Subsidiary as
part of the same transaction, an argument may have arisen that the minority
shareholders in Subsidiary were not entitled to tax-free treatment on the
exchange.  The ruling recognized that each transaction qualified as a
reorganization under Code section 368, and did not raise a concern as to an
inability to complete the transaction absent the two steps.  This approval of
prearranged back-to-back reorganizations accomplishes the same objectives as the
Mercantile Merger and Consolidation, in that a target is acquired and the
outstanding minority interest in the target's subsidiary is acquired as well.

     Private letter rulings are normally considered to have only limited
precedential value.  Nonetheless, when the private letter ruling is considered
in conjunction with Revenue Ruling 73-16, the Service appears to approve of
prearranged back-to-back reorganizations, so long as each of the transactions
qualifies as a reorganization.  In the case of the two transactions described in
the Reorganization Agreement, the Mercantile Merger qualifies as a
reorganization under Code sections 368(a)(1)(A) and 368(a)(2)(E).  Further, the
Consolidation qualifies as a tax-free reorganization under Code section
368(a)(1)(B).  Satisfying the qualifications of these Code sections, the fact
that one reorganization immediately follows the other, pursuant to a prearranged
plan, will not, in our opinion, have any impact on the tax liability of Wells
Fargo, Mercantile, Bank, or the holders of Mercantile or Bank stock that differs
from the consequences arising had each transaction occurred independently.

     This letter is solely for the information and use of you and the
shareholders of Mercantile and Bank and, except to the extent that such may be
referred to and reproduced as an exhibit to the Registration Statement, it is
not to be used, circulated, quoted, or referred to for any other purpose or
relied upon by any other person for whatever reason without our prior written
consent.

                         KILPATRICK STOCKTON LLP


                         By: ________________________________________
                            Scott M. Dayan, Partner

<PAGE>
 
                                                                    EXHIBIT 23.2
                                                                                

                            [LETTERHEAD OF KPMG LLP]



                         Independent Auditors' Consent
                         -----------------------------

                                        

The Board of Directors
Wells Fargo & Company

We consent to the incorporation by reference in the Proxy Statement-Prospectus 
included in this Registration Statement on Form S-4 of Wells Fargo & Company of
our report dated January 19, 1999 with respect to the supplemental consolidated 
balance sheet of Wells Fargo & Company and Subsidiaries as of December 31, 1997 
and 1996, and the related supplemental consolidated statements of income, 
changes in stockholders' equity, and cash flows for each of the years in the 
three-year period ended December 31, 1997, which report appears in the Form 8-K 
of Wells Fargo & Company dated January 19, 1999, and to the reference to our 
firm under the heading "Experts" in the Proxy Statement-Prospectus. Our report 
contains an explanatory paragraph that states that the supplemental consolidated
financial statements give retroactive effect to the merger of Wells Fargo & 
Company and Norwest Corporation on November 2, 1998, which has been accounted 
for as a pooling-of-interests as described in Note 1 to the supplemental 
consolidated financial statements.


                              /s/ KPMG LLP



San Francisco, California
February 1, 1999

<PAGE>
 
                                                                    EXHIBIT 23.3


            [ON THE LETTERHEAD OF BURTON MCCUMBER & CORTEZ, L.L.P.]


                         INDEPENDENT AUDITORS' CONSENT
                         -----------------------------
                                        



THE BOARD OF DIRECTORS
MERCANTILE BANK, NATIONAL ASSOCIATION


WE CONSENT TO INCORPORATION BY REFERENCE HEREIN OF OUR REPORT DATED FEBRUARY 25,
1998, WITH RESPECT TO THE CONSOLIDATED BALANCE SHEETS OF MERCANTILE BANK,
NATIONAL ASSOCIATION AS OF DECEMBER 31, 1996 AND 1997, AND THE RELATED
CONSOLIDATED STATEMENTS OF EARNINGS, STOCKHOLDERS' EQUITY AND CASH FLOWS FOR
EACH OF THE THREE YEARS IN THE PERIOD ENDED DECEMBER 31, 1997 AND TO THE
REFERENCE TO OUR FIRM UNDER THE HEADING "EXPERTS" IN THE PROSPECTUS.

                                            /S/BURTON, MCCUMBER & CORTEZ, L.L.P.



BROWNSVILLE, TEXAS
FEBRUARY 1, 1999

<PAGE>
 
                                                                    EXHIBIT 23.4
                                                                                

                       CONSENT OF KILPATRICK STOCKTON LLP

     We hereby consent to the reference to our firm's name and tax opinion in
the Registration Statement (Form S-4) to be filed by Wells Fargo with the
Securities and Exchange Commission with respect to shares of Wells Fargo common
stock to be issued in connection with the merger of a newly formed, wholly-owned
subsidiary of Wells Fargo & Company into Mercantile Financial Enterprises, Inc.
and the consolidation of Mercantile Bank, National Association with a newly-
formed interim national bank.


                                    KILPATRICK STOCKTON LLP


                                    By  /s/Scott M. Dayan
                                        ---------------------------
                                        Scott M. Dayan, Partner

<PAGE>
 
                                                                    EXHIBIT 23.5


           [LETTERHEAD OF ALEX SHESHUNOFF & CO. INVESTMENT BANKING]



              CONSENT OF ALEX SHESHUNOFF & CO. INVESTMENT BANKING


We hereby consent to the incorporation by reference in this Registration 
Statement on Form S-4 of Wells Fargo Corporation of our opinion, dated October 
9, 1998 with respect to the merger of Wells Fargo Corporation and Mercantile 
Financial Enterprises, Inc., and to our firm, respectively, included in the 
Registration Statement of Wells Fargo Corporation (the "Initial Registration 
Statement") and to the inclusion of such opinion as an annex to the Initial 
Registration Statement. By giving such consent, we do not thereby admit that we 
come within the category of persons whose consent is required under Section 7 of
the Securities Act of 1933 or the rules and regulations of the Securities and 
Exchange Commission thereunder.

                                         ALEX SHESHUNOFF & CO.
                                         INVESTMENT BANKING


                                         By: /s/ Paul W. Taylor 
                                           ---------------------------------
AUSTIN, TX
January 29, 1999

<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.


                                  /s/ Les S. Biller
                                  -----------------
                                  Les S. Biller
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.


                                  /s/J.A. Blanchard
                                  -----------------
                                  J.A. Blanchard III
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.

                                  /s/ David A. Christensen
                                  ------------------------
                                  David A. Christensen
<PAGE>
 
                                                                      EXHIBIT 24
                                                                                
                             WELLS FARGO & COMPANY
                    (formerly known as NORWEST CORPORATION)
                                        
                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of WELLS FARGO & COMPANY (formerly known as NORWEST CORPORATION), a Delaware
corporation, does hereby make, constitute and appoint RICHARD M. KOVACEVICH, LES
BILLER, STANLEY S. STROUP, AND LAUREL A. HOLSCHUH, and each or any one of them,
the undersigned's true and lawful attorneys-in-fact, with power of substitution,
for the undersigned and in the undersigned's name, place and stead, to sign and
affix the undersigned's name as such director and/or officer of said Company to
a Registration Statement on Form S-4 or other applicable form, and all
amendments, including post-effective amendments, thereto, to be filed by said
Company with the Securities and Exchange Commission, Washington, D.C., in
connection with the registration under the Securities Act of 1933, as amended,
of up to 5,000,000 shares of Common Stock of the Company, adjusted for any
change in the number of outstanding shares of Common Stock resulting from stock
splits, reverse stock splits or stock dividends occurring after the date hereof,
which may be issued in connection with the acquisition by the Company of
Hemisphere Financial, Ltd., Brownsville, Texas and/or its subsidiaries, and to
file the same, with all exhibits thereto and other supporting documents, with
said Commission, granting unto said attorneys-in-fact, and each of them, full
power and authority to do and perform any and all acts necessary or incidental
to the performance and execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
22nd day of January, 1999.

                              /s/Susan E. Engel
                              -----------------
                                 Susan E. Engel
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.


                                  /s/ William A. Hodder
                                  ---------------------
                                  William A. Hodder
<PAGE>
 
                                                                      EXHIBIT 24
                                                                                
                             WELLS FARGO & COMPANY
                    (formerly known as NORWEST CORPORATION)
                                        
                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of WELLS FARGO & COMPANY (formerly known as NORWEST CORPORATION), a Delaware
corporation, does hereby make, constitute and appoint RICHARD M. KOVACEVICH, LES
BILLER, STANLEY S. STROUP, AND LAUREL A. HOLSCHUH, and each or any one of them,
the undersigned's true and lawful attorneys-in-fact, with power of substitution,
for the undersigned and in the undersigned's name, place and stead, to sign and
affix the undersigned's name as such director and/or officer of said Corporation
to a Registration Statement on Form S-4 or other applicable form, and all
amendments, including post-effective amendments, thereto, to be filed by said
Company with the Securities and Exchange Commission, Washington, D.C., in
connection with the registration under the Securities Act of 1933, as amended,
of up to 5,000,000 shares of Common Stock of the Company, adjusted for any
change in the number of outstanding shares of Common Stock resulting from stock
splits, reverse stock splits or stock dividends occurring after the date hereof,
which may be issued in connection with the acquisition by the Company of
Hemisphere Financial, Ltd., Brownsville, Texas and/or its subsidiaries, and to
file the same, with all exhibits thereto and other supporting documents, with
said Commission, granting unto said attorneys-in-fact, and each of them, full
power and authority to do and perform any and all acts necessary or incidental
to the performance and execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
11th day of January, 1999.

                                  /s/Rodney L. Jacobs
                                  -------------------
                                  Rodney L. Jacobs
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.


                                  /s/ Reatha Clark King
                                  ---------------------
                                  Reatha Clark King
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.


                                  /s/ Richard M. Kovacevich
                                  -------------------------
                                  Richard M. Kovacevich
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.



                                  /s/ Richard D. McCormick
                                  ------------------------
                                  Richard D. McCormick
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.


                                  /s/ Cynthia H. Milligan
                                  -----------------------
                                  Cynthia H. Milligan
<PAGE>
 
                                                                      EXHIBIT 24
                             WELLS FARGO & COMPANY
                    (formerly known as NORWEST CORPORATION)
                                        
                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of WELLS FARGO & COMPANY (formerly known as NORWEST CORPORATION), a Delaware
corporation, does hereby make, constitute and appoint RICHARD M. KOVACEVICH, LES
BILLER, STANLEY S. STROUP, AND LAUREL A. HOLSCHUH, and each or any one of them,
the undersigned's true and lawful attorneys-in-fact, with power of substitution,
for the undersigned and in the undersigned's name, place and stead, to sign and
affix the undersigned's name as such director and/or officer of said Company to
a Registration Statement on Form S-4 or other applicable form, and all
amendments, including post-effective amendments, thereto, to be filed by said
Company with the Securities and Exchange Commission, Washington, D.C., in
connection with the registration under the Securities Act of 1933, as amended,
of up to 5,000,000 shares of Common Stock of the Company, adjusted for any
change in the number of outstanding shares of Common Stock resulting from stock
splits, reverse stock splits or stock dividends occurring after the date hereof,
which may be issued in connection with the acquisition by the Company of
Hemisphere Financial, Ltd., Brownsville, Texas and/or its subsidiaries, and to
file the same, with all exhibits thereto and other supporting documents, with
said Commission, granting unto said attorneys-in-fact, and each of them, full
power and authority to do and perform any and all acts necessary or incidental
to the performance and execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
22nd day of January, 1999.

                                  /s/Benjamin F. Montoya
                                  ----------------------
                                   Benjamin F. Montoya
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.



                                  /s/ Ian M. Rolland
                                  ------------------
                                  Ian M. Rolland
<PAGE>
 
                                                                      EXHIBIT 24

                              NORWEST CORPORATION

                               Power of Attorney
                           of Director and/or Officer
                                        

   KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer
of NORWEST CORPORATION, a Delaware corporation, does hereby make, constitute and
appoint RICHARD M. KOVACEVICH, LES BILLER, STANLEY S. STROUP, JOHN T. THORNTON,
AND LAUREL A. HOLSCHUH, and each or any one of them, the undersigned's true and
lawful attorneys-in-fact, with power of substitution, for the undersigned and in
the undersigned's name, place and stead, to sign and affix the undersigned's
name as such director and/or officer of said Corporation to a Registration
Statement on Form S-4 or other applicable form, and all amendments, including
post-effective amendments, thereto, to be filed by said Corporation with the
Securities and Exchange Commission, Washington, D.C., in connection with the
registration under the Securities Act of 1933, as amended, of up to 5,000,000
shares of Common Stock of the Corporation, adjusted for any change in the number
of outstanding shares of Common Stock resulting from stock splits, reverse stock
splits or stock dividends occurring after the date hereof, which may be issued
in connection with the acquisition by the Corporation of Hemisphere Financial,
Ltd., Brownsville, Texas and its subsidiaries, and to file the same, with all
exhibits thereto and other supporting documents, with said Commission, granting
unto said attorneys-in-fact, and each of them, full power and authority to do
and perform any and all acts necessary or incidental to the performance and
execution of the powers herein expressly granted.

   IN WITNESS WHEREOF, the undersigned has executed this power of attorney this
28th day of April, 1998.


                                  /s/ Michael W. Wright
                                  ---------------------
                                  Michael W. Wright

<PAGE>
 
                                                                      Exhibit 99

     Proxy for Special Meeting of Shareholders of Mercantile Bank, National
                                  Association

     The undersigned hereby appoints ____________________ and _______________,
or either of them, as proxies to vote all shares of Common Stock the undersigned
is entitled to vote at the Special Meeting of Shareholders of Mercantile Bank,
National Association ("the Bank") to be held at 1:30 p.m., Brownsville, Texas
time, on February 24, 1999 at 835 East Levee Street, Brownsville, Texas, or at
any adjournment or postponement thereof, as follows, hereby revoking any proxy
previously given:

     1. To approve the acquisition of the Bank by Wells Fargo & Company ("Wells
Fargo") by a consolidation of the Bank (the "Consolidation") with an interim
national bank pursuant to an Agreement and Plan of Reorganization (the
"Reorganization Agreement"), dated as of October 28, 1998, by and among
Mercantile Financial Enterprises, Inc. ("Mercantile"), the Bank, and Wells
Fargo, and a related Agreement and Plan of Consolidation, (the "Consolidation
Agreement"), all upon the terms and subject to the conditions set forth in the
Reorganization Agreement and the Consolidation Agreement, copies of which are
included as Appendices A and B in the accompanying Proxy Statement-Prospectus;
and to authorize such further action by the Board of Directors and officers of
the Bank as may be necessary or appropriate to carry out the intent and purposes
of the Reorganization Agreement.

           FOR  [_]        AGAINST  [_]         ABSTAIN   [_]

     2. In the discretion of the persons appointed proxies hereby on such other
matters as may properly come before the Special Meeting.

     Shares represented by this proxy will be voted as directed by the
shareholder.  The Board of Directors recommends a vote "FOR" Proposal 1.  If no
direction is supplied, the proxy will be voted "FOR" Proposal 1.

                                  Dated: _________________________, 1999.


                                  _____________________________________________
                                  (Please sign exactly as name appears at left.)


                                  _____________________________________________
                                  (If stock is owned by more than one person,
                                  all owners should sign. Persons signing as
                                  executors administrators, trustees, or in
                                  similar capacities should so indicate.)


                    THIS PROXY IS SOLICITED ON BEHALF OF THE
          BOARD OF DIRECTORS OF MERCANTILE BANK, NATIONAL ASSOCIATION


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