WELLS FARGO & CO
DFAN14A, 1995-12-08
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
THE FOLLOWING SOLICITING MATERIAL IS IDENTICAL IN ALL RESPECTS TO THE SOLICITING
MATERIAL FILED ON SCHEDULE 14A BY WELLS FARGO & COMPANY WITH THE SECURITIES AND 
EXCHANGE COMMISSION ON NOVEMBER 27, 1995.  THE SOLE PURPOSE OF THIS 
RETRANSMISSION IS TO CORRECT AN EDGAR TRANSMISSION ERROR IN SUCH NOVEMBER 27, 
1995 FILING.
<PAGE>
 
                                  SCHEDULE 14A
                                 (Rule 14a-101)
                    INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION
                Proxy Statement Pursuant to Section 14(a) of the
                        Securities Exchange Act of 1934

Filed by the registrant  / /

Filed by party other than the registrant  /x/

Check the appropriate box:

     / /  Preliminary proxy statement      / /  Confidential, for Use of the
 
     / /  Definitive proxy statement            Commission Only (as permitted by
 
     / /  Definitive additional materials       Rule 14a-6(e)(2))

     /x/  Soliciting material pursuant to
          Rule 14a-11(c) or Rule 14a-12

                            FIRST INTERSTATE BANCORP
                (Name of Registrant as Specified In Its Charter)

                             WELLS FARGO & COMPANY
                   (Name of Person(s) Filing Proxy Statement)

Payment of filing fee (Check the appropriate box):

     /x/  $125 per Exchange Act Rule 0-11(c)(1)(ii), 14a-6(i)(1), or 14a-
          6(j)(2).

     / /  $500 per each party to the controversy pursuant to Exchange Act Rule
          14a-6(i)(3).

     / /  Fee computed on table below per Exchange Act Rules 14a-6(i)4 and 0-11.

          (1)  Title of each class of securities to which transaction applies:

          (2)  Aggregate number of securities to which transaction applies:

          (3)  Per unit price or other underlying value of transaction computed
               pursuant to Exchange Act Rule 0-11:

          (4)  Proposed maximum aggregate value of transaction:

          (5)  Total fee paid:

     / /  Fee paid previously with preliminary materials.

     / /  Check box if any part of the fee is offset as provided by Exchange Act
          Rule 0-11(a)(2) and identify the filing for which the offsetting fee
          was paid previously.  Identify the previous filing by registration
          statement number, or the form or schedule and the date of its filing.

          (1)  Amount Previously Paid:

          (2)  Form Schedule or Registration Statement No.:

          (3)  Filing Party:

          (4)  Date Filed:
<PAGE>
 
                       [LETTERHEAD OF WELLS FARGO & CO.]

                                  NEWS RELEASE

FOR IMMEDIATE RELEASE                                   Kim Kellogg 415-396-3606
- ---------------------                                                 
Mon., Nov. 27, 1995                                     Steve Bruce 212-371-5999
                                      __________________________________________
                                      Public Relations Department (415) 396-3606
                                                   343 Sansome Street, 2nd Floor
                                                         San Francisco, CA 94163

WELLS FARGO FILES EXCHANGE OFFER WITH SEC


          Wells Fargo & Company (NYSE:  WFC) today announced that it has filed
its Exchange Offer with the Securities and Exchange Commission (SEC) for the
acquisition of all outstanding shares of First Interstate Bancorp (NYSE:  I)

          "For First Interstate shareholders, this filing means that our offer
will stand side by side against First Bank System's offer," said Paul Hazen,
chairman of Wells Fargo & Company.  "First Interstate shareholders can be
assured that if they reject the First Bank System merger, they will be able to
exchange their shares for Wells Fargo & Company stock within the same time frame
that applied to the First Bank System proposal."

          Wells Fargo said it plans to file proxy solicitation materials with
the SEC to solicit proxies against the First Bank System merger within the next
week.  Wells Fargo anticipates initiating its proxy solicitation at the same
time as First Interstate begins a proxy solicitation for its special meeting to
consider First Bank System's proposal.

          If the First Interstate shareholders reject the First Bank System
merger, Wells Fargo will complete the exchange offer and accept First Interstate
shares as soon as it receives regulatory approvals and acceptance of its offer
by First Interstate's board of directors.  If First Interstate board approval is
not forthcoming, Wells Fargo will use written consents to remove the First
Interstate board.

          All these actions can take place within the same time schedule as
First Bank System would require to obtain regulatory approvals.  Although the
time period cannot be certain, Wells Fargo believes that it would be in a
position to consummate its merger with First Interstate in the second quarter of
1996.
                                     -more-
<PAGE>
 
        SHARES OF FIRST INTERSTATE COMMON STOCK HELD BY WELLS FARGO, ITS
           DIRECTORS AND EXECUTIVE OFFICERS AND CERTAIN EMPLOYEES AND
           OTHER REPRESENTATIVES OF WELLS FARGO WHO MAY ALSO SOLICIT
           PROXIES, AND CERTAIN TRANSACTIONS BETWEEN ANY OF THEM AND
                                FIRST INTERSTATE

          Wells Fargo may solicit proxies against the First Interstate/First
Bank System merger.  The participants in this solicitation may include Wells
Fargo, the directors of Wells Fargo (H. Jesee Arnelle, William R. Breuner,
William S. Davila, Rayburn S. Dezember, Paul Hazen, Robert K. Jaedicke, Ellen M.
Newman, Philip J. Quigley, Carl E. Reichardt, Donald B. Rice, Susan G. Swenson,
Chang-Lin Tien, John A. Young and William F. Zuendt), and the following
executive officers and employees of Wells Fargo:  Michael J. Gillfillan (Vice
Chairman), Charles M. Johnson (Vice Chairman), Clyde W. Ostler (Vice Chairman),
Rodney L. Jacobs (Vice Chairman and Chief Financial Officer), Leslie L. Altick
(Executive Vice President and Director of Corporate Communications), Patricia R.
Callahan (Executive Vice President and Personnel Director), Frank A. Moeslein
(Executive Vice President and Controller), Guy Rounsaville, Jr. (Executive Vice
President, Chief Counsel and Secretary), Ross J. Kari (Executive Vice President
and General Auditor) and Eric D. Shand (Executive Vice President and Chief Loan
Examiner).

          As of November 20, 1995, Wells Fargo owned beneficially 100 shares of
First Interstate Common Stock.  Additionally, as of October 20, 1995, Wells
Fargo held 1,961,095 shares of First Interstate Common Stock (or approximately
2.6% of the outstanding shares) in a fiduciary capacity.  Wells Fargo disclaims
beneficial ownership of the shares owned in such fiduciary capacity and any
other shares held by any pension plan of Wells Fargo or any affiliates of Wells
Fargo.

          Philip J. Quigley beneficially owns 500 shares of First Interstate
Common Stock through the Philip J. Quigley Trust.

          As of November 1, 1995, Rayburn S. Dezember had outstanding a loan
from First Interstate in a principal amount of $365,000.

          As the Chancellor of the University of California, Berkeley, Chang-Lin
Tien is an officer of the Regents of the University of California (the
"Regents"), the legal entity which encompasses the University of California.
The Regents' business relationships with First Interstate Bank of California
("FICAL"), a subsidiary of First Interstate, include:  (i) FICAL's acting as
trustee under $1.9 billion in debt issued by the Regents (for which the Regents
paid FICAL $231,800 in trustee fees from the period from January 1, 1994,
through September 30, 1995), (ii) FICAL's acting as lender of certain
construction and other loans made to the Regents (for which there was $122
million outstanding as of September 30, 1995), and (iii) the maintenance of two
deposit accounts with FICAL (for which the Regents incurred $671,000 in service
fees and other charges since January 1, 1994, through September 30, 1995).

          Although CS First Boston Corporation and Montgomery Securities,
financial advisors to Wells Fargo, do not admit that they or any of their
directors, officers, employees or affiliates are a "participant," as defined in
Schedule 14A promulgated under the Securities Exchange Act of 1934 by the
Securities Exchange Commission, or that such Schedule 14A requires the
disclosure of certain information concerning CS First Boston Corporation and
Montgomery Securities, they may assist Wells Fargo in such a solicitation.  Each
of CS First Boston Corporation and Montgomery Securities engages in a full range
of investment banking, securities trading, market-making and brokerage services
for institutional and individual clients.  In the normal course of their
businesses, CS First Boston Corporation and Montgomery Securities may trade
securities of First Interstate for their own account and the account of their
customers and, accordingly, may at any time hold a long or short position in
such securities.

          Except as disclosed above, to the knowledge of Wells Fargo, none of
Wells Fargo, the directors or executive officers of Wells Fargo or the employees
or other representatives of Wells Fargo named above has any interest direct or
indirect, by security holdings or otherwise, in First Interstate.

                                     # # #
<PAGE>
 
  AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 27, 1995.
                                                      REGISTRATION NO. 33-
================================================================================
 
                      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                          6021                13-2553920
(State or other jurisdiction of (Primary Standard Industrial  (I.R.S. Employer
 incorporation or organization)  Classification Code Number) Identification No.)

                            420 MONTGOMERY STREET 
                       SAN FRANCISCO, CALIFORNIA 94163 
                                (415) 477-1000
        (Address, including zip code, and telephone number, including 
            area code, of registrant's principal executive offices)

                             GUY ROUNSAVILLE, JR. 
             EXECUTIVE VICE PRESIDENT, CHIEF COUNSEL AND SECRETARY
                            WELLS FARGO & COMPANY 
                            420 MONTGOMERY STREET 
                        SAN FRANCISCO, CALIFORNIA 94163
                                (415) 477-1000
 
         (Name and address, including zip code, and telephone number, 
                  including area code, of agent for service)

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

                                   COPY TO: 
                              ALAN J. SINSHEIMER 
                             SULLIVAN & CROMWELL 
                               125 BROAD STREET 
                           NEW YORK, NEW YORK 10004 
                                (212) 558-4000

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

       APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: 
AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS 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. [_]

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

                        CALCULATION OF REGISTRATION FEE
<TABLE> 
<CAPTION> 
===================================================================================================
                                                  PROPOSED        PROPOSED
                                  AMOUNT          MAXIMUM          MAXIMUM
  TITLE OF EACH CLASS OF           TO BE       OFFERING PRICE     AGGREGATE          AMOUNT OF
SECURITIES TO BE REGISTERED    REGISTERED(1)     PER SHARE    OFFERING PRICE(2) REGISTRATION FEE(2)
- ---------------------------------------------------------------------------------------------------
<S>                          <C>               <C>            <C>               <C>
Common stock, par value
$5.00 per share              50,496,170 Shares Not applicable  $10,135,520,000      $3,495,010
===================================================================================================
</TABLE> 
(1) Represents the maximum number of shares of common stock of Wells Fargo &
    Company issuable upon consummation of the exchange offer for shares of
    common stock, par value $2.00 per share, of First Interstate Bancorp (the
    "Shares"), based upon the number of Shares outstanding on October 31,
    1995.
(2) Pursuant to Rules 457(f)(1) and 457(c) of the Securities Act of 1933, as
    amended, and solely for purposes of calculating the registration fee, the
    registration fee was computed on the basis of the average of the high and
    low prices of Shares as reported on the New York Stock Exchange Composite
    Tape on November 17, 1995.
  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>
 
                             WELLS FARGO & COMPANY
 
                            CROSS-REFERENCE SHEET 
                   PURSUANT TO ITEM 501(b) OF REGULATION S-K
 
<TABLE>
<CAPTION>
              FORM S-4 ITEM NUMBER AND HEADING           LOCATION IN PROSPECTUS
              --------------------------------           ----------------------
 <C> <C>                                                <S>
 1.  Forepart of Registration Statement and Outside
      Front Cover Page of Prospectus................... Outside Front Cover Page

 2.  Inside Front and Outside Back Cover
      Pages of Prospectus.............................. Table of Contents;
                                                        Available Information;
                                                        Incorporation of Certain
                                                        Information by Reference

 3.  Risk Factors, Ratio of Earnings to Fixed
      Charges and Other Information.................... Prospectus Summary

 4.  Terms of the Transaction.......................... Prospectus Summary;
                                                        Background of the Offer;
                                                        The Offer; Description
                                                        of Wells Fargo Capital
                                                        Stock; Comparison of
                                                        Rights of Holders of
                                                        Shares and Wells Fargo
                                                        Common Stock; Market
                                                        Prices and Dividends

 5.  Pro Forma Financial Information................... Pro Forma Combined
                                                        Financial Data

 6.  Material Contacts with the Company Being           
      Acquired......................................... Background of the Offer; 
                                                        The Offer                 

 7.  Additional Information Required for Reoffering
      by Persons and Parties Deemed to be
      Underwriters..................................... *

 8.  Interests of Named Experts and Counsel............ Validity of Wells Fargo
                                                        Common Stock; Experts

 9.  Disclosure of Commission Position on
      Indemnification for Securities Act Liabilities... *

 10. Information with Respect to S-3 Registrants....... Incorporation of Certain
                                                        Information by Reference

 11. Incorporation of Certain Information               
      by Reference..................................... Incorporation of Certain 
                                                        Information by           
                                                        Reference; Description   
                                                        of Wells Fargo Capital   
                                                        Stock  

 12. Information with Respect to S-2 or                
      S-3 Registrants.................................. *

 13. Incorporation of Certain Information
      by Reference..................................... *

 14. Information with Respect to Registrants Other
      Than S-2 or S-3 Registrants...................... *

 15. Information with Respect to S-3 Companies......... Incorporation of Certain
                                                        Information by
                                                        Reference; Background of
                                                        the Offer
 16. Information with Respect to S-2 or
      S-3 Companies.................................... *

 17. Information with Respect to Companies Other
      than S-2 or S-3 Companies........................ *

 18. Information if Proxies, Consents or Authorizations
      are to be Solicited.............................. *

 19. Information if Proxies, Consents or Authorizations
      are not to be Solicited or in an Exchange Offer.. Outside Front Cover
                                                        Page; Prospectus
                                                        Summary; The Offer;
                                                        Incorporation of Certain
                                                        Information by Reference
</TABLE>
- --------
*Indicates that Item is not applicable or answer is in the negative.
<PAGE>
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF
ANY SUCH STATE.
                 SUBJECT TO COMPLETION, DATED NOVEMBER 27, 1995
PROSPECTUS
 
    OFFER TO EXCHANGE EACH OUTSTANDING SHARE OF COMMON STOCK (INCLUDING THE
                    ASSOCIATED COMMON STOCK PURCHASE RIGHTS)
 
                                       OF
 
                            FIRST INTERSTATE BANCORP
 
                                      FOR
 
                     TWO-THIRDS OF A SHARE OF COMMON STOCK
 
                                       OF
 
                             WELLS FARGO & COMPANY
 
 
   THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT
 12:00 MIDNIGHT, NEW YORK CITY TIME, ON     , 1996,
 UNLESS EXTENDED. SHARES WHICH ARE TENDERED PURSUANT
 TO THE OFFER MAY BE WITHDRAWN AT ANY TIME PRIOR TO
 THE EXPIRATION OF THE OFFER.
 
  Wells Fargo & Company, a Delaware corporation (the "Purchaser"), hereby
offers, upon the terms and subject to the conditions set forth herein and in
the related Letter of Transmittal (collectively, the "Offer"), to exchange two-
thirds of a share of Common Stock, par value $5.00 per share, of the Purchaser
("Wells Fargo Common Stock") for each outstanding share of Common Stock, par
value $2.00 per share (each, a "Share" and collectively, the "Shares"), of
First Interstate Bancorp (the "Company"), including the associated common stock
purchase rights (each, a "Right" and collectively, the "Rights") issued
pursuant to the Rights Agreement, dated as of November 21, 1988, between the
Company and First Interstate Bank of California, as successor Rights Agent,
validly tendered on or prior to the Expiration Date and not withdrawn. Unless
the context otherwise requires and unless and until the Rights are redeemed,
all references to Shares shall include the associated Rights. On     , 199 ,
the closing price of the Shares on the New York Stock Exchange was $   per
Share. Based on the closing price of Wells Fargo Common Stock on the same date,
the value of the Offer was $   per Share. The value of the Offer will change as
the market price of the Wells Fargo Common Stock changes.
 
  THE PURCHASER'S OBLIGATION TO EXCHANGE SHARES OF WELLS FARGO COMMON STOCK FOR
SHARES PURSUANT TO THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, (i) THERE
BEING VALIDLY TENDERED AND NOT WITHDRAWN PRIOR TO THE EXPIRATION OF THE OFFER A
NUMBER OF SHARES WHICH, TOGETHER WITH THE SHARES BENEFICIALLY OWNED BY THE
PURCHASER AND ITS AFFILIATES FOR THEIR OWN RESPECTIVE ACCOUNTS, WILL CONSTITUTE
AT LEAST A MAJORITY OF THE TOTAL NUMBER OF OUTSTANDING SHARES ON A FULLY
DILUTED BASIS (I.E., AS THOUGH ALL OPTIONS OR OTHER SECURITIES CONVERTIBLE INTO
OR EXERCISABLE OR EXCHANGEABLE FOR SHARES, OTHER THAN THE RIGHTS, HAD BEEN SO
CONVERTED, EXERCISED OR EXCHANGED) AS OF THE DATE THE SHARES ARE ACCEPTED FOR
EXCHANGE BY THE PURCHASER
                                                  (cover continued on next page)
 
                                  -----------
 
THESE SECURITIES  HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE  SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE  SECURITIES
 AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION PASSED  UPON THE
 ACCURACY OR  ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO  THE CONTRARY
  IS A CRIMINAL OFFENSE.
 
                                  -----------
 
                  THE DEALER MANAGER[S] FOR THE OFFER IS[ARE]:
 
                                   [TO COME]
 
    , 1996
<PAGE>
 
PURSUANT TO THE OFFER (THE "MINIMUM TENDER CONDITION"), (ii) APPROVAL OF THE
ISSUANCE OF SHARES OF WELLS FARGO COMMON STOCK PURSUANT TO THE OFFER BY A
MAJORITY VOTE OF THE HOLDERS OF WELLS FARGO COMMON STOCK VOTING AT A MEETING
OF SUCH HOLDERS (THE "WELLS FARGO STOCKHOLDER APPROVAL CONDITION"), (iii) THE
BOARD OF DIRECTORS OF THE COMPANY HAVING REDEEMED THE RIGHTS AND, PURSUANT TO
SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW (THE "DGCL"), APPROVED THE
ACQUISITION OF SHARES PURSUANT TO THE OFFER, OR THE PURCHASER BEING OTHERWISE
SATISFIED IN ITS SOLE DISCRETION THAT THE RIGHTS AND THE PROVISIONS OF SECTION
203 RESTRICTING CERTAIN BUSINESS COMBINATIONS ARE INVALID OR ARE NOT
APPLICABLE TO THE ACQUISITION OF SHARES PURSUANT TO THE OFFER AND THE MERGER
(THE "RIGHTS PLAN AND DGCL 203 CONDITION"), (iv) THE STOCKHOLDERS OF THE
COMPANY NOT HAVING APPROVED THE AGREEMENT AND PLAN OF MERGER BETWEEN THE
COMPANY, FIRST BANK SYSTEM, INC. AND ELEVEN ACQUISITION CORP. (THE "FIB/FBS
MERGER AGREEMENT CONDITION"), AND (v) ALL REGULATORY APPROVALS REQUIRED TO
CONSUMMATE THE OFFER AND THE MERGER HAVING BEEN OBTAINED AND REMAINING IN FULL
FORCE AND EFFECT, ALL STATUTORY WAITING PERIODS IN RESPECT THEREOF HAVING
EXPIRED AND NO SUCH APPROVAL CONTAINING ANY CONDITIONS OR RESTRICTIONS WHICH
THE BOARD OF DIRECTORS OF THE PURCHASER REASONABLY DETERMINES IN GOOD FAITH
WILL HAVE OR REASONABLY BE EXPECTED TO HAVE A MATERIAL ADVERSE EFFECT (AS
DEFINED HEREIN) ON THE PURCHASER, THE COMPANY AND THEIR RESPECTIVE
SUBSIDIARIES TAKEN AS A WHOLE (THE "REGULATORY APPROVAL CONDITION").
 
                               ----------------
 
THIS PROSPECTUS AND THE OFFER MADE HEREBY DO NOT CONSTITUTE A SOLICITATION OF
ANY PROXIES OR CONSENTS. ANY SUCH SOLICITATIONS WILL BE MADE ONLY PURSUANT TO
SEPARATE PROXY OR CONSENT SOLICITATION MATERIALS COMPLYING WITH THE
REQUIREMENTS OF SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934.
 
                               ----------------
 
                                   IMPORTANT
 
  Any stockholder desiring to tender all or any portion of his Shares and the
associated Rights should either (a) complete and sign the Letter of
Transmittal or a facsimile copy thereof in accordance with the instructions in
the Letter of Transmittal, and mail or deliver the Letter of Transmittal or
such facsimile and any other required documents to the Exchange Agent and
either deliver the certificates for such Shares and Rights to the Exchange
Agent along with the Letter of Transmittal, deliver such Shares and Rights
pursuant to the procedures for book-entry transfer set forth herein (in the
case of Rights, only if such procedures are available) or comply with the
guaranteed delivery procedures set forth below or (b) request his broker,
dealer, commercial bank, trust company or other nominee to effect the
transaction for him. A stockholder having Shares and Rights registered in the
name of a broker, dealer, commercial bank, trust company or other nominee must
contact such broker, dealer, commercial bank, trust company or other nominee
if he desires to tender such Shares and Rights.
 
  Stockholders will be required to tender one Right for each Share tendered in
order to effect a valid tender of Shares, unless the Rights Plan and DGCL 203
Condition (insofar as it relates to the Rights) has been satisfied or waived.
Unless the Company Distribution Date (as defined herein) occurs, a tender of
Shares will constitute a tender of the associated Rights.
 
  Questions and requests for assistance may be directed to the Information
Agent or to the Dealer Manager[s] at [its] [their respective] address[es] and
telephone numbers set forth on the back cover of this Prospectus. Requests for
additional copies of this Prospectus and the Letter of Transmittal may be
directed to the Information Agent or to brokers, dealers, commercial banks or
trust companies.
 
                                      ii
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Available Information.....................................................  iv
Incorporation of Certain Information by Reference.........................  iv
Company Information.......................................................   v
Prospectus Summary........................................................   1
Background of the Offer...................................................  14
 General..................................................................  14
 Comparison of the Proposals..............................................  16
 Litigation...............................................................  24
 FIB/FBS Merger Agreement.................................................  25
The Offer.................................................................  33
 General..................................................................  33
 Extension, Termination and Amendment.....................................  34
 Exchange of Shares; Delivery of Wells Fargo Common Stock.................  35
 Cash in Lieu of Fractional Shares of Wells Fargo Common Stock............  35
 Withdrawal Rights........................................................  36
 Procedure for Tendering .................................................  36
 Certain Federal Income Tax Consequences..................................  39
 Effect of Offer on Market for Shares; Registration Under the 
   Exchange Act...........................................................  41
 Purpose of the Offer; the Merger.........................................  42
 Minimum Tender Condition.................................................  43
 Wells Fargo Stockholder Approval Condition...............................  44
 Rights Plan and DGCL 203 Condition.......................................  44
 FIB/FBS Merger Agreement Condition.......................................  46
 Regulatory Approval Condition............................................  46
 Certain Other Conditions of the Offer....................................  48
 Relationships with the Company...........................................  50
 Fees and Expenses........................................................  50
 Accounting Treatment.....................................................  51
 Stock Exchange Listing...................................................  51
</TABLE>
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Business of Wells Fargo....................................................  52
Pro Forma Combined Financial Information...................................  53
Description of Wells Fargo Capital Stock...................................  61
 Wells Fargo Common Stock..................................................  61
 Repurchases of Wells Fargo Common Stock...................................  61
 Wells Fargo Preferred Stock...............................................  61
 Certain Regulatory Considerations.........................................  63
Comparison of Rights of Holders of Shares and Wells Fargo Common Stock.....  68
 Special Meetings of Stockholders..........................................  68
 Number of Directors.......................................................  68
 Advance Notice of Stockholder Nominations of Directors....................  68
 Stockholder Proposal Procedures...........................................  69
 Indemnification...........................................................  69
 Certain Voting Rights for Mergers.........................................  69
 Cumulative Voting.........................................................  69
 Removal of Directors; Filling Vacancies on the Board of Directors.........  69
 Stockholder Action by Written Consent.....................................  70
 Amendment of Bylaws.......................................................  70
 Classification of Board of Directors......................................  70
Market Prices and Dividends................................................  71
 Wells Fargo...............................................................  71
 The Company...............................................................  72
Validity of Wells Fargo Common Stock.......................................  73
Experts....................................................................  73
Schedule A--Directors and Executive
 Officers of the Purchaser................................................. A-1
Schedule B--Section 203 of the Delaware General Corporation Law............ B-1
</TABLE>
 
                                      iii
<PAGE>
 
                             AVAILABLE INFORMATION
 
  The Purchaser and the Company are subject to the informational requirements
of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and,
in accordance therewith, file reports, proxy statements and other information
with the Securities and Exchange Commission (the "Commission"). The reports,
proxy statements and other information filed by the Purchaser and the Company
with the Commission may be inspected and copied at the Commission's public
reference room located at Judiciary Plaza, 450 Fifth Street, N.W., Room 1024,
Washington, D.C. 20549, and at the public reference facilities in the
Commission's regional offices located at: 7 World Trade Center, 13th Floor,
New York, New York 10048, and Suite 1400, Northwestern Atrium Center, 500 West
Madison Street, Chicago, Illinois 60661. Copies of such material may be
obtained at prescribed rates by writing to the Securities and Exchange
Commission, Public Reference Section, 450 Fifth Street, N.W., Washington, D.C.
20549. The Shares and the Wells Fargo Common Stock are listed on the New York
Stock Exchange (the "NYSE") and the Pacific Stock Exchange (the "PSE"). The
periodic reports, proxy statements and other information filed by the
Purchaser and the Company with the Commission may be inspected at the offices
of the New York Stock Exchange, Inc., 20 Broad Street, New York, New York
10005 and at the offices of the Pacific Stock Exchange, 301 Pine Street, San
Francisco, California 94104.
 
  This Prospectus does not contain all of the information set forth in the
Registration Statement on Form S-4 (the "Registration Statement") covering the
Wells Fargo Common Stock offered hereby which has been filed with the
Commission, certain portions of which have been omitted pursuant to the rules
and regulations of the Commission, and to which portions reference is hereby
made for further information with respect to the Purchaser, the Company and
the securities offered hereby. Statements contained herein concerning any
documents are not necessarily complete and, in each instance, reference is
made to the copies of such documents filed as exhibits to the Registration
Statement. Each such statement is qualified in its entirety by such reference.
 
  Not later than the date of commencement of the Offer, the Purchaser will
file with the Commission a statement on Schedule 14D-1 pursuant to Rule 14d-3
under the Exchange Act furnishing certain information with respect to the
Offer. Pursuant to Rules 14d-9 and 14e-2 under the Exchange Act, the Company
filed on November 20, 1995 a statement on Schedule 14D-9 (the "Company
Schedule 14D-9") regarding its position concerning the Offer. Such Schedules
and any amendments thereto should be available for inspection and copying as
set forth above (except that such Schedules and any amendments thereto will
not be available at the regional offices of the Commission).
 
  Pursuant to Rule 409 promulgated under the Securities Act of 1933, as
amended (the "Securities Act"), and Rule 12b-21 promulgated under the Exchange
Act, the Purchaser will request that the Company provide to the Purchaser the
information required for complete disclosure concerning the business,
operations, financial condition and management of the Company. The Purchaser
will provide any and all information which it receives from the Company prior
to the expiration of the Offer and which the Purchaser deems material,
reliable and appropriate in a subsequently prepared amendment or supplement
hereto.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
  THIS PROSPECTUS INCORPORATES BY REFERENCE DOCUMENTS NOT PRESENTED HEREIN OR
DELIVERED HEREWITH. THESE DOCUMENTS ARE AVAILABLE WITHOUT CHARGE UPON REQUEST
TO SECRETARY, WELLS FARGO & COMPANY, 420 MONTGOMERY STREET, SAN FRANCISCO,
CALIFORNIA 94163. TELEPHONE REQUESTS MAY BE DIRECTED TO THE CORPORATE
SECRETARY'S DEPARTMENT AT (415) 396-4386. IN ORDER TO ENSURE TIMELY DELIVERY
OF SUCH DOCUMENTS, ANY REQUEST FOR DOCUMENTS SHOULD BE SUBMITTED NOT LATER
THAN SEVEN BUSINESS DAYS PRIOR TO THE EXPIRATION DATE OF THE OFFER.
 
  The following documents filed with the Commission by the Purchaser (File No.
1-6214) are incorporated herein by reference: (a) the Purchaser's Annual
Report on Form 10-K for the year ended December 31, 1994 (the "1994 Wells
Fargo 10-K"); (b) the portions of the Purchaser's Proxy Statement for the
Annual Meeting of
 
                                      iv
<PAGE>
 
Stockholders held on April 18, 1995 that have been incorporated by reference
in the 1994 Wells Fargo 10-K; (c) the Purchaser's Quarterly Reports on Form
10-Q for the periods ended March 31, 1995, June 30, 1995 and September 30,
1995; (d) the Purchaser's Current Reports on Form 8-K dated January 17, 1995,
April 18, 1995, June 21, 1995, July 18, 1995, October 17, 1995, October 18,
1995 and October 23, 1995; and (e) the description of Wells Fargo Common Stock
contained in the Purchaser's Registration Statement on Form 8-B filed with the
Commission June 17, 1987.
 
  The following documents filed with the Commission by the Company (File No.
1-4114) are incorporated herein by reference: (a) the Company's Annual Report
on Form 10-K for the year ended December 31, 1994 (the "1994 Company 10-K")
(excluding the report of the Company's independent accountants included
therein); (b) the portions of the Company's Proxy Statement for the Annual
Meeting of Stockholders held on April 28, 1995 that have been incorporated by
reference in the 1994 Company 10-K; (c) the Company's Quarterly Reports on
Form 10-Q for the periods ended March 31, 1995, June 30, 1995 and September
30, 1995; and (d) the Company's Current Reports on Form 8-K or 8-K/A dated
February 15, 1995, March 24, 1995, May 1, 1995, May 26, 1995 and November 5,
1995.
 
  All documents filed by either the Purchaser or the Company pursuant to
Section 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date
hereof and prior to the date the Offer is terminated or Shares are accepted
for exchange shall be deemed to be incorporated herein by reference and to be
a part hereof from the date of such filing. Any statement contained herein or
in a document incorporated or deemed to be incorporated herein by reference
shall be deemed to be modified or superseded for purposes hereof to the extent
that a statement contained herein or in any other subsequently filed document
which also is, or is deemed to be, incorporated herein by reference modifies
or supersedes such statement. Any such statement so modified or superseded
shall not be deemed to constitute a part hereof, except as so modified or
superseded.
 
                              COMPANY INFORMATION
 
  While the Purchaser has included information concerning the Company insofar
as it is known or reasonably available to the Purchaser, the Company is not
affiliated with the Purchaser and the Company has not to date permitted access
by the Purchaser to the Company's books and records. Therefore, information
concerning the Company which has not been made public is not available to the
Purchaser. Although the Purchaser has no knowledge that would indicate that
statements relating to the Company contained or incorporated by reference in
this Prospectus in reliance upon publicly available information are inaccurate
or incomplete, the Company was not involved in the preparation of such
information and statements and, for the foregoing reasons, is not in a
position to verify any such information or statements.
 
                               ----------------
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR MAKE ANY
REPRESENTATION IN CONNECTION WITH THE OFFER OTHER THAN THOSE CONTAINED OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE PURCHASER OR THE DEALER MANAGER[S]. THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER OR A SOLICITATION TO ANY PERSON IN ANY JURISDICTION IN
WHICH SUCH OFFER OR SOLICITATION IS UNLAWFUL. THE OFFER IS NOT BEING MADE TO,
NOR WILL TENDERS BE ACCEPTED FROM OR ON BEHALF OF, HOLDERS OF SHARES IN ANY
JURISDICTION IN WHICH THE MAKING OR ACCEPTANCE THEREOF WOULD NOT BE IN
COMPLIANCE WITH THE LAWS OF SUCH JURISDICTION. HOWEVER, THE PURCHASER MAY, IN
ITS SOLE DISCRETION, TAKE SUCH ACTION AS IT MAY DEEM NECESSARY TO MAKE THE
OFFER IN ANY SUCH JURISDICTION AND EXTEND THE OFFER TO HOLDERS OF SHARES IN
SUCH JURISDICTION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY EXCHANGE
HEREUNDER SHALL UNDER ANY CIRCUMSTANCES CREATE ANY IMPLICATION THAT THERE HAS
BEEN NO CHANGE IN THE AFFAIRS OF THE PURCHASER OR THE COMPANY SINCE THE DATE
AS OF WHICH INFORMATION IS FURNISHED OR THE DATE HEREOF.
 
  IN ACCORDANCE WITH VARIOUS STATE SECURITIES LAWS APPLICABLE TO THE OFFER
WHICH REQUIRE THE OFFER TO BE MADE TO THE PUBLIC BY A LICENSED BROKER OR
DEALER, THE OFFER IS HEREBY MADE TO THE COMPANY'S STOCKHOLDERS RESIDING IN
EACH SUCH STATE BY     , AS DEALER MANAGER[S], ON BEHALF OF THE PURCHASER.
 
                                       v
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  The information below is qualified in its entirety by the more detailed
information and financial statements appearing elsewhere in this Prospectus,
including the documents incorporated in this Prospectus by reference. As used
in this Prospectus, the term "Purchaser" refers to Wells Fargo & Company and,
unless the context otherwise requires, its subsidiaries, and the term "Company"
refers to First Interstate Bancorp and, unless the context otherwise requires,
its subsidiaries.
 
WELLS FARGO & COMPANY
 
  The Purchaser is a bank holding company incorporated in the State of Delaware
and registered under the Bank Holding Company Act of 1956, as amended (the
"BHCA"). Based on total consolidated assets at December 31, 1994, it was the
15th largest bank holding company in the United States, having total deposits
of $42.3 billion and total assets of $53.4 billion.
 
  The Purchaser's principal subsidiary is Wells Fargo Bank, N.A., which is the
seventh largest bank in the United States and is the successor to the banking
portion of the business founded by Henry Wells and William G. Fargo in 1852.
Today, the Purchaser operates one of the largest banking businesses in the
United States. The bank provides a broad range of financial products and
services through electronic and traditional channels. Customers can access
accounts electronically seven days a week, 24 hours a day. Besides serving as
banker to millions of California households, the Purchaser provides a full
range of banking and financial services to commercial, corporate, real estate
and small business customers across the nation. Its primary lines of business
are summarized under "Business of Wells Fargo."
 
  The Purchaser has its principal executive offices at 420 Montgomery Street,
San Francisco, California 94163, telephone number (415) 477-1000.
 
FIRST INTERSTATE BANCORP
 
  The following information concerning the Company is excerpted from the 1994
Company 10-K:
 
  "The [Company] was incorporated under the laws of the State of Delaware and
began operations in 1958. . . The [Company] is a bank holding company
registered under the [BHCA]. At December 31, 1994, it owned directly all of the
shares of capital stock of 16 banks . . . which operated approximately 1,100
banking offices in 13 states. Ranked according to assets, the [Company] was the
fourteenth largest commercial banking organization in the United States at
December 31, 1994, having total deposits of $48.4 billion and total assets of
$55.8 billion. . ."
 
  The Company has its principal executive offices at 633 West Fifth Street, Los
Angeles, California 90071, telephone number (213) 614-3001.
 
BACKGROUND OF THE OFFER
 
  On September 7, 1995, Paul Hazen, Chairman and Chief Executive Officer of the
Purchaser, met with William Siart, Chairman and Chief Executive Officer of the
Company, to discuss the possibility of a merger of the two companies. No
conclusions were reached, but Mr. Siart indicated that the Company would
probably not be prepared to consider a merger in the immediate future. On the
afternoon of October 17, 1995, Mr. Hazen telephoned Mr. Siart to inform him
that the Purchaser intended to deliver a letter containing a merger proposal to
the Company and that Mr. Hazen would like to meet with Mr. Siart later that day
to deliver the letter in person and to discuss the proposal. Mr. Siart asked
for some time to consider the request, but called Mr. Hazen back shortly
thereafter to say that he saw no reason for the two of them to meet. The
Purchaser's letter was then delivered to the Company.
<PAGE>
 
  On October 18, 1995, the Company and, shortly thereafter, the Purchaser
publicly announced that the Purchaser had made a proposal (the "Original
Proposal") to the Company for a tax-free merger in which the Company's
stockholders would receive 0.625 of a share of Wells Fargo Common Stock for
each Share. The market reacted favorably to the announcement, with the Wells
Fargo Common Stock closing on that date at $229 per share, an increase of
$15.375 (7.2%) from its closing price the day before. Based on that market
price, the Original Proposal represented a $37.13 per Share, or 35%, premium to
the closing price per Share on the preceding day.
 
  On October 26, 1995, Mr. Siart and Mr. Hazen met again. At that meeting, Mr.
Siart acknowledged that a merger of the Company and the Purchaser would enhance
stockholder value. Mr. Hazen explained the cost savings estimates being used by
the Purchaser and offered to have the individuals at the Purchaser who had
prepared those estimates meet with their counterparts at the Company in order
to demonstrate that the expected cost savings were achievable. After
discussion, Mr. Siart declined that offer and stated that the Company agreed
with the Purchaser's cost savings estimates. Mr. Hazen then offered to raise
the exchange ratio in the Purchaser's proposal to 0.65 of a share of Wells
Fargo Common Stock for each Share if the Company would enter into a merger
agreement with the Purchaser. Mr. Siart rejected this increased offer, but
indicated that the Purchaser might accept a merger with a 0.70 exchange ratio.
Mr. Hazen stated that the Purchaser was unwilling to raise its bid any further
at that time.
 
  On October 31, 1995, Mr. Siart and Mr. Hazen again met. Mr. Hazen again
offered to have the individuals at the Purchaser who had prepared the cost
savings estimates meet with their counterparts at the Company in order to
demonstrate that the expected cost savings were achievable. Mr. Siart again
declined that offer and stated that the Company agreed with the Purchaser's
cost savings estimates. Mr. Siart indicated that he would be prepared to
recommend a merger with the Purchaser if the Purchaser would increase the
exchange ratio in its proposal to a 0.68 exchange ratio. Mr. Hazen replied that
he believed that an exchange ratio of 0.65 was a bid that was fair to the
stockholders of the Company and the Purchaser.
 
  On November 1, 1995, Messrs. Siart and Hazen talked again, this time by
telephone, but made no further progress towards an agreement. Mr. Hazen
attempted to reach Mr. Siart on November 2nd and November 3rd by telephone, but
his calls were not returned.
 
  On November 5, 1995, the Company, First Bank System, Inc. ("FBS") and Eleven
Acquisition Corp., a subsidiary of FBS ("FBS Sub"), entered into an Agreement
and Plan of Merger (the "FIB/FBS Merger Agreement") pursuant to which FBS Sub
and the Company would merge (the "FIB/FBS Merger") and each Share would be
converted into the right to receive 2.60 shares of common stock, par value
$1.25 per share, of FBS (the "FBS Common Stock"). Under the terms of the
FIB/FBS Merger Agreement, following the consummation of that merger, FBS would
change its name to First Interstate Bancorp and there would be an even split of
the Board of the combined company. The FIB/FBS Merger is subject to a number of
conditions which are identical in all material respects to the conditions of
the Offer, including among others that all regulatory and stockholder approvals
be obtained, although it is also subject to an additional condition which is
not a condition to the Offer, namely that each of the Company and FBS shall
have received a letter from its accountants to the effect that the FIB/FBS
Merger will qualify for "pooling of interests" accounting treatment. Based on
discussions with its advisors, the Purchaser believes there is a significant
question as to whether the FIB/FBS Merger will qualify for pooling of interests
accounting treatment in light of the increased share repurchase program FBS
announced in connection with the FIB/FBS Merger. See "Background of the Offer--
Comparison of the Proposals--Purchase Versus Pooling of Interests Accounting"
and "--FIB/FBS Merger Agreement."
 
  The Company entered into the FIB/FBS Merger Agreement (as well as certain
"lock-up" arrangements set forth in the Reciprocal Fee Letters and Reciprocal
Stock Option Agreements referred to below) despite the fact that, based on the
last available closing prices per share prior to doing so, the FIB/FBS Merger
produced a value (at the 2.60 exchange ratio) of $132.28 per Share while the
then current Purchaser proposal produced a value (at the 0.65 exchange ratio)
of $137.96 per Share, or $5.68 per Share higher. In fact, based on the averages
of the closing prices per share on the 15 trading days (which 15 day trading
period encompasses the announcements of
 
                                       2
<PAGE>
 
both proposals) prior to entering into the FIB/FBS Merger Agreement, the
FIB/FBS Merger produced a value of $132.15 per Share while the then current
Purchaser proposal produced a value of $139.41 per Share, or $7.26 per Share
higher. Moreover, according to the Company Schedule 14D-9, the Company entered
into the FIB/FBS Merger Agreement (and "lock-up" arrangements) despite the
finding by one of its financial advisors (Morgan Stanley & Co. Incorporated)
that the Purchaser's Original Proposal (at a 0.625 exchange ratio, or 6.3%
below the exchange ratio being offered pursuant to the Offer) was also fair
from a financial point of view to the stockholders of the Company.
 
  On November 13, 1995, the Purchaser announced its intention to offer to
exchange two-thirds of a share of Wells Fargo Common Stock for each Share. In a
publicly released letter setting forth such offer, Mr. Hazen again stated that
the Purchaser would be prepared to enter into a merger agreement with the
Company providing for the same consideration as the Offer. In the event that
the Company did not elect to terminate the FIB/FBS Merger Agreement, the
Purchaser offered to agree to a process pursuant to which both FBS and the
Purchaser would each have 10 days to submit their best and final merger
proposals, which proposals would together be presented to the Company's
stockholders, who could decide for themselves which proposal was in their best
interest. The Company did not respond to this proposal.
 
  As part of the November 13, 1995 announcement, the Purchaser also stated that
it anticipated filing (a) preliminary proxy solicitation materials with the
Commission for use in soliciting proxies from stockholders of the Company
against approval of the FIB/FBS Merger and (b) preliminary consent solicitation
materials with the Commission for use in soliciting written consents from
stockholders of the Company to replace the current members of the Board of
Directors of the Company (the "Company Board") with nominees who are committed
to removing any obstacles to the merger of the Company with the Purchaser. THIS
PROSPECTUS AND THE OFFER MADE HEREBY DO NOT CONSTITUTE A SOLICITATION OF ANY
PROXIES OR CONSENTS FROM THE COMPANY'S STOCKHOLDERS. ANY SUCH SOLICITATION WILL
BE MADE ONLY PURSUANT TO SEPARATE PROXY OR CONSENT SOLICITATION MATERIALS
COMPLYING WITH THE REQUIREMENTS OF SECTION 14(a) OF THE EXCHANGE ACT.
 
  The Purchaser also announced on November 13, 1995 the filing of a complaint
against the Company, the Company Board, FBS and FBS Sub in the Delaware
Chancery Court, which, among other things, seeks to invalidate the FIB/FBS
Merger Agreement and the break-up fees and stock option arrangements (commonly
referred to as "lock-up" arrangements) granted to FBS pursuant to the
Reciprocal Fee Letters (as defined herein) and the Reciprocal Stock Option
Agreements (as defined herein), respectively, and seeks injunctive relief
requiring the Company Board to redeem the Rights and to prevent the Company
from using anti-takeover devices or taking other actions intended to impede or
delay the acquisition of the Company by the Purchaser. See "Background of The
Offer--Litigation."
 
  On November 13, 1995, the Purchaser also filed an application with the
Federal Reserve Bank of San Francisco seeking approval of, among other things,
the Offer and the Merger. The Purchaser subsequently filed or will soon file
additional applications and notices with various governmental authorities
seeking all approvals required to permit consummation of the Offer and the
Merger. The Purchaser anticipates that it will obtain regulatory approvals on a
timely basis and believes that the regulators will consider the Purchaser's
applications for approval of the Offer and the Merger in a time frame
substantially identical to that of the FBS applications for approval of the
FIB/FBS Merger. See "The Offer--Regulatory Approval Condition." In this regard,
the Company Schedule 14D-9 states that the Company Board determined "it was
likely that each of FBS and Wells would ultimately receive all [regulatory]
approvals."
 
  On November 20, 1995, the Company Schedule 14D-9 was filed with the
Commission stating, among other things, that the Company Board was committed to
completing the FIB/FBS Merger and recommending that the Company's stockholders
not tender their Shares in the Offer.
 
  In the Company Schedule 14D-9, there is a detailed list of 16 factors
considered by the Company Board as material in selecting the FBS merger
proposal over the Purchaser's merger proposal. Conspicuously absent from that
list is any consideration of the implied purchase price produced by each of the
two proposals. At all times during the Company Board's consideration of each
Purchaser proposal and FBS proposal, the then current
 
                                       3
<PAGE>
 
Purchaser proposal has produced an implied purchase price significantly higher
than the implied purchase price produced by the then current FBS proposal. At
the time the two proposals were first considered by the Company Board, the then
current Purchaser proposal produced an implied purchase price of between $9.14
and $19.14 per Share higher (based on statements in the Company Schedule 14D-
9). At the time the FBS proposal was accepted, the differential was $5.68 per
Share. On November 22, 1995 (the last full trading day prior to the date of
this preliminary prospectus) the differential was $8.02 per Share.
 
  For more detailed information concerning the background of the Offer, and for
a comparison of the Offer and the FIB/FBS Merger, see "Background of the Offer"
below.
 
THE OFFER
 
  The Purchaser hereby offers, upon the terms and subject to the conditions set
forth herein and in the related Letter of Transmittal (which together
constitute the "Offer"), to exchange two-thirds of a share of Wells Fargo
Common Stock for each outstanding Share validly tendered on or prior to the
Expiration Date and not withdrawn. The term "Expiration Date" shall mean 12:00
midnight, New York City time, on     , 1996, unless and until the Purchaser
extends the period of time for which the Offer is open, in which event the term
"Expiration Date" shall mean the latest time and date at which the Offer, as so
extended by the Purchaser, shall expire. See "The Offer--General."
 
  The purpose of the Offer is for the Purchaser to acquire control of, and
ultimately the entire common equity interest in, the Company. The Purchaser
intends, as soon as practicable after consummation of the Offer, to seek to
have the Company consummate a merger with the Purchaser pursuant to which each
outstanding Share (except for treasury shares of the Company and Shares held by
the Purchaser or any subsidiary of the Purchaser other than in a fiduciary
capacity) would be converted into the right to receive two-thirds of a share of
Wells Fargo Common Stock (the "Merger"). See "The Offer--Purpose of the Offer;
the Merger."
 
  The Purchaser's obligation to exchange shares of Wells Fargo Common Stock for
Shares pursuant to the Offer is conditioned upon satisfaction of the Minimum
Tender Condition, the Wells Fargo Stockholder Approval Condition, the Rights
Plan and DGCL 203 Condition, the FIB/FBS Merger Agreement Condition and the
Regulatory Approval Condition (in each case as defined on the cover page of
this Prospectus) and the other conditions set forth under "The Offer--Certain
Other Conditions of the Offer." The conditions to the Offer are identical in
all material respects to a number of the conditions to the competing proposal
to effect the FIB/FBS Merger, including among others that all regulatory and
stockholder approvals be obtained, although the competing proposal is also
subject to an additional condition which is not a condition to the Offer,
namely that each of the Company and FBS shall have received a letter from its
accountants to the effect that the FIB/FBS Merger will qualify for "pooling of
interests" accounting treatment. Subject to the applicable rules and
regulations of the Commission, the Purchaser expressly reserves the right, in
its sole discretion, at any time or from time to time, to delay acceptance for
exchange or, regardless of whether such Shares were theretofore accepted for
exchange, exchange of any Shares pursuant to the Offer or to amend or terminate
the Offer and not accept for exchange or exchange any Shares not theretofore
accepted for exchange, or exchanged, upon the failure of any of the conditions
of the Offer to be satisfied. The Purchaser reserves the absolute right to
waive any of the conditions of the Offer or any defect or irregularity in the
tender of any securities. See "The Offer--Minimum Tender Condition," "--Wells
Fargo Stockholder Approval Condition, "--Rights Plan and DGCL 203 Condition,"
"--FIB/FBS Merger Agreement Condition," "--Regulatory Approval Condition" and
"--Certain Other Conditions of the Offer." Waiver or amendment of any of these
conditions may require an extension of the Offer.
 
  Stockholders will be required to tender one Right for each Share tendered in
order to effect a valid tender of Shares, unless the Rights Plan and DGCL 203
Condition (insofar as it relates to the Rights) has been satisfied
 
                                       4
<PAGE>
 
or waived. Unless the Company Distribution Date occurs, a tender of Shares will
constitute a tender of the associated Rights.
 
 Extension, Termination and Amendment
 
  The Purchaser expressly reserves the right, in its sole discretion, at any
time or from time to time, to extend the period of time during which the Offer
is to remain open by giving oral or written notice of such extension to the
Exchange Agent, which extension must be announced no later than 9:00 A.M., New
York City time, on the next business day after the previously scheduled
Expiration Date. There can be no assurance that the Purchaser will exercise its
right to extend the Offer. However, it is the Purchaser's current intention to
extend the Offer until all conditions have been satisfied or waived. See "The
Offer--Extension, Termination and Amendment." During any such extension, all
Shares previously tendered and not withdrawn will remain subject to the Offer,
subject to the right of a tendering stockholder to withdraw his Shares. See
"The Offer--Withdrawal Rights."
 
 Exchange of Shares; Delivery of Wells Fargo Common Stock
 
  Upon the terms and subject to the conditions of the Offer, the acceptance for
exchange and the exchange of all outstanding Shares validly tendered and not
withdrawn will be made promptly after the Expiration Date. See "The Offer--
Exchange of Shares; Delivery of Wells Fargo Common Stock."
 
 Withdrawal Rights
 
  Tenders of Shares made pursuant to the Offer are irrevocable, except that
Shares tendered pursuant to the Offer may be withdrawn at any time prior to the
Expiration Date, and, unless theretofore accepted for exchange by the Purchaser
pursuant to the Offer, may also be withdrawn at any time after     , 1996. See
"The Offer--Withdrawal Rights."
 
 Procedure for Tendering
 
  For a stockholder to validly tender Shares pursuant to the Offer, (i) a
properly completed and duly executed Letter of Transmittal (or manually
executed facsimile thereof), together with any required signature guarantees
and any other required documents, must be transmitted to and received by the
Exchange Agent at one of its addresses set forth on the back cover of this
Prospectus and certificates for tendered Shares must be received by the
Exchange Agent at such address or such Shares must be tendered pursuant to the
procedures for book-entry tender set forth under "The Offer--Procedure for
Tendering" (and a confirmation of receipt of such tender received), in each
case prior to the Expiration Date, or (ii) such stockholder must comply with
the guaranteed delivery procedure set forth under "The Offer--Procedure for
Tendering." As noted above, stockholders will be required to tender one Right
for each Share tendered in order to effect a valid tender of Shares, unless the
Rights Plan and DGCL 203 Condition (insofar as it relates to the Rights) has
been satisfied or waived. Unless the Company Distribution Date occurs, a tender
of Shares will constitute a tender of the associated Rights.
 
  THE METHOD OF DELIVERY OF SHARE CERTIFICATES AND ALL OTHER REQUIRED
DOCUMENTS, INCLUDING DELIVERY THROUGH ANY BOOK-ENTRY TRANSFER FACILITY, IS AT
THE OPTION AND RISK OF THE TENDERING STOCKHOLDER, AND THE DELIVERY WILL BE
DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE EXCHANGE AGENT. IF DELIVERY IS
BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED, IS
RECOMMENDED. IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE TIMELY
DELIVERY.
 
                                       5
<PAGE>
 
 Certain Federal Income Tax Consequences
 
  In the opinion of Sullivan & Cromwell, counsel for the Purchaser, exchanges
of Shares for Wells Fargo Common Stock pursuant to the Offer and the Merger
should be treated for federal income tax purposes as exchanges pursuant to a
plan of reorganization within the meaning of the Internal Revenue Code of 1986,
as amended (the "Code"). Consequently, no gain or loss should be recognized by
holders of Shares upon such exchanges, except with respect to the receipt of
cash in lieu of fractional shares of Wells Fargo Common Stock and the surrender
of Rights that have become exercisable. This opinion is based on Sullivan &
Cromwell's view that the Offer and the Merger should be treated as a single
transaction and on certain assumptions, including that (a) the continuity of
shareholder interest requirement applicable to corporate reorganizations (which
requires a continuing equity interest in the Purchaser by holders owning a
significant percentage of the Shares prior to the consummation of the Offer)
will be satisfied, taking into account any holders that exercise dissenters'
rights, if any, (b) the Purchaser will continue the Company's historic business
or will use a significant portion of the Company's historic business assets in
a business and (c) the Offer and the Merger will generally be consummated as
contemplated by this Prospectus.
 
  In rendering their opinion, Sullivan & Cromwell have further assumed that (a)
upon consummation of the Offer, there will be no significant contingencies
preventing the prompt consummation of the Merger, (b) upon consummation of the
Offer, the Purchaser will not have waived any of the conditions relating to its
obligation to consummate the Offer in a manner that could prevent a prompt
consummation of the Merger and (c) the Merger will in fact be consummated
promptly after the consummation of the Offer. A significant delay in the
consummation of the Merger would substantially increase the risk that the Offer
will not qualify as part of a reorganization within the meaning of Section
368(a)(1)(A) of the Code and the absence of the Merger would mean that the
Offer was not part of a reorganization.
 
  Assuming that the Merger qualifies as a reorganization under the Code, no
gain or loss will be recognized by the Purchaser or the Company as a result of
the Offer and the Merger.
 
  If the Offer and the Merger together qualify as a reorganization within the
meaning of Section 368(a)(1)(A) of the Code, no gain or loss will be recognized
by a U.S. Holder (as defined under "The Offer--Certain Federal Income Tax
Consequences"), except with respect to a U.S. Holder who receives cash in lieu
of fractional shares of Wells Fargo Common Stock or surrenders Rights that have
become exercisable.
 
  If the Merger is not consummated, or if the Merger is consummated but the
Offer is treated as a separate transaction for federal income tax purposes,
exchanges pursuant to the Offer will be taxable transactions for federal income
tax purposes. In that case, each U.S. Holder exchanging Shares for shares of
Wells Fargo Common Stock pursuant to the Offer will recognize gain or loss for
federal income tax purposes measured by the difference between such U.S.
Holder's adjusted basis in the Shares exchanged and the sum of the fair market
value of Wells Fargo Common Stock received by such U.S. Holder pursuant to the
Offer and any cash received by such U.S. Holder in lieu of fractional shares of
Wells Fargo Common Stock.
 
  If the Offer is a taxable transaction, the Merger itself should be considered
a reorganization within the meaning of Section 368(a)(1)(A) of the Code if the
continuity of interest requirement is satisfied in the Merger. For advanced
ruling purposes, guidelines published by the Internal Revenue Service would
require that stockholders of the Company receive in the Merger stock of the
Purchaser having a value equal to at least 50% of the value of all of the stock
of the Company outstanding prior to the Merger. In that event, a U.S. Holder
receiving Wells Fargo Common Stock in the Merger would be subject to the rules
concerning reorganizations described above with respect to such Wells Fargo
Common Stock, but not with respect to any Wells Fargo Common Stock received by
such U.S. Holder pursuant to the Offer.
 
  All stockholders should carefully read the discussion under "The Offer--
Certain Federal Income Tax Consequences" and are urged to consult with their
own tax advisors.
 
                                       6
<PAGE>
 
 Effect of Offer on Market for Shares; Registration Under the Exchange Act
 
  The exchange of Shares pursuant to the Offer will reduce the number of
holders of Shares and the number of Shares that might otherwise trade publicly
and could adversely affect the liquidity and market value of the remaining
Shares held by the public.
 
  The Shares are listed on the NYSE and the PSE. Depending on the number of
Shares acquired pursuant to the Offer, the Shares may no longer meet the
requirements of such exchanges for continued listing, and the Shares may no
longer constitute "margin securities" for purposes of the Federal Reserve
Board's margin regulations, in which event the Shares could no longer be used
as collateral for margin loans made by brokers. See "The Offer--Effect of Offer
on Market for Shares; Registration Under the Exchange Act."
 
DESCRIPTION OF WELLS FARGO CAPITAL STOCK
 
  The authorized capital stock of the Purchaser consists of 150,000,000 shares
of Wells Fargo Common Stock, par value $5.00 per share, and 25,000,000 shares
of preferred stock, par value $5.00 per share. As of October 31, 1995, there
were 46,966,721 shares of Wells Fargo Common Stock, 1,500,000 shares of
Adjustable Rate Cumulative Preferred Stock, Series B, 477,500 shares of 9%
Preferred Stock, Series C, and 350,000 shares of 8 7/8% Preferred Stock, Series
D, issued and outstanding.
 
  Holders of shares of Wells Fargo Common Stock are entitled to one vote per
share for each share held. Subject to the rights of holders of shares of the
Purchaser's outstanding preferred stock, holders of shares of Wells Fargo
Common Stock have equal rights to participate in dividends when declared and,
in the event of liquidation, in the net assets of the Purchaser available for
distribution to stockholders. The Purchaser may not declare any dividends on
the Wells Fargo Common Stock unless full preferential amounts to which holders
of the Purchaser's preferred stock are entitled have been paid or declared and
set apart for payment. The Purchaser is also subject to certain contractual and
regulatory restrictions on the payment of dividends.
 
  For additional information concerning the capital stock of the Purchaser, see
"Description of Wells Fargo Capital Stock."
 
MARKET PRICES
 
  The following table sets forth the market price per share of Wells Fargo
Common Stock and per Share and the equivalent market price per Share on (i)
October 17, 1995, the last trading day preceding public announcement of the
Original Proposal, (ii) October 18, 1995, the trading day of the announcement
of the Original Proposal, (iii) November 10, 1995, the last trading day
preceding public announcement of the Offer and (iv) November 22, 1995, the last
full trading day prior to the date of this preliminary prospectus. The
historical market prices represent the closing prices per share on such dates
on the NYSE Composite Tape. The equivalent market prices per Share represent
the closing price per share of Wells Fargo Common Stock multiplied by two-
thirds, the fraction of a share of Wells Fargo Common Stock which is
exchangeable in the Offer for each Share. See "Market Prices and Dividends."
 
<TABLE>
<CAPTION>
                                                              FIRST INTERSTATE
                                                 WELLS FARGO --------------------
                                                   ACTUAL      ACTUAL  EQUIVALENT
                                                 ----------- --------- ----------
<S>                                              <C>         <C>       <C>
October 17, 1995................................    $213 5/8  $106      $142.42
October 18, 1995................................     229       140 1/4   152.67
November 10, 1995...............................     215 3/8   134 3/4   143.58
November 22, 1995...............................     213 3/8   134 1/8   142.25
</TABLE>
 
                                       7
<PAGE>
 
THE EXCHANGE AGENT
 
       has been appointed exchange agent (the "Exchange Agent") in connection
with the Offer. The Letter of Transmittal (or facsimile copies thereof) and
certificates for Shares should be sent by each tendering stockholder of Shares
or his broker, dealer, bank or other nominee to the Exchange Agent at the
addresses set forth on the back cover of this Prospectus.
 
REQUEST FOR ASSISTANCE AND ADDITIONAL COPIES
 
  Requests for information or assistance concerning the Offer may be directed
to the Dealer Manager[s] or the Information Agent at their addresses set forth
on the back cover of this Prospectus. Requests for additional copies of this
Prospectus and the Letter of Transmittal should be directed to the Information
Agent.
 
                                       8
<PAGE>
 
CAPITALIZATION OF WELLS FARGO & COMPANY
 
  The following table sets forth the capitalization of the Purchaser and its
subsidiaries as of September 30, 1995 and as adjusted to give effect to (a) the
exchange of approximately 75,727,000 Shares for shares of Wells Fargo Common
Stock pursuant to the Offer and the Merger (collectively, the "Acquisition"),
assuming that none of the Company's existing stock options are exercised, and
(b) the conversion of preferred stock of the Company into preferred stock of
the Purchaser pursuant to the Acquisition.
 
<TABLE>
<CAPTION>
                                                           SEPTEMBER 30, 1995
                                                           --------------------
                                                            ACTUAL    ADJUSTED
                                                           --------  ----------
<S>                                                        <C>       <C>
(IN MILLIONS)
SENIOR AND SUBORDINATED DEBT
  Floating Rate Subordinated Note Due 2000................ $    118  $     118
  8.20% Notes Due 1996....................................      200        200
  Fixed Rate Medium-Term Notes............................       35         35
  Floating Rate Medium Term Notes.........................    1,228      1,228
  8.75% Subordinated Notes Due 2002.......................      199        199
  8.375% Subordinated Notes Due 2002......................      149        149
  6.875% Subordinated Notes Due 2003......................      150        150
  6.125% Subordinated Notes Due 2003......................      249        249
  Floating Rate Subordinated German Mark Notes Due 1995...      210        210
  Floating Rate Subordinated Notes Due 1997...............      101        101
  Floating Rate Subordinated Euro Notes Due 1997..........      100        100
  Floating Rate Subordinated Capital Notes Due 1998.......      200        200
  Senior and subordinated debt of First Interstate........      --       1,368
  Other...................................................       81         81
                                                           --------  ---------
TOTAL SENIOR AND SUBORDINATED DEBT........................    3,020      4,388
                                                           --------  ---------
STOCKHOLDERS' EQUITY
Preferred Stock
  Cumulative adjustable rate preferred stock..............       75         75
  Cumulative perpetual preferred stock(1).................      414        764
                                                           --------  ---------
Total preferred stockholders' equity......................      489        839
                                                           --------  ---------
Common Stock
  Common stock, par value $5 per share; authorized
   150,000,000 shares;
   issued and outstanding 47,465,721 shares (actual) and
   97,950,388 (adjusted)..................................      237        489
  Additional paid-in capital..............................    1,221     11,754
  Retained earnings.......................................    1,932      1,932
  Other...................................................       (5)        (5)
                                                           --------  ---------
Total common stockholders' equity.........................    3,385     14,170
                                                           --------  ---------
TOTAL STOCKHOLDERS' EQUITY................................    3,874     15,009
                                                           --------  ---------
TOTAL CAPITALIZATION...................................... $  6,894  $  19,397
                                                           ========  =========
</TABLE>
- --------
(1) The adjusted amount includes $350 million of the Company's preferred stock
    that will be converted into preferred stock of the Purchaser pursuant to
    the Acquisition.
 
                                       9
<PAGE>
 
COMPARISON OF CERTAIN UNAUDITED PER SHARE DATA
 
  The following table sets forth certain historical, pro forma combined and pro
forma equivalent per share financial information for the common stock of the
Purchaser and of the Company. The pro forma amounts included in the table
assume completion of the Acquisition and are based on the purchase method of
accounting, a preliminary determination and allocation of the total purchase
price and the assumptions described under "Pro Forma Combined Financial
Information." The information should be read in conjunction with and is
qualified in its entirety by the consolidated financial statements and
accompanying notes of the Purchaser and the Company included in the documents
described under "Incorporation of Certain Information by Reference" (but which,
in the case of the Company, are not covered by the report of the Company's
independent accountants for purposes of this Prospectus) and the pro forma
combined financial statements and accompanying discussion and notes set forth
under "Pro Forma Combined Financial Information." The pro forma amounts in the
table below are presented for informational purposes and are not necessarily
indicative of the financial position or the results of operations of the
combined company that would have actually occurred had the Acquisition been
consummated as of the dates or for the periods presented. The pro forma amounts
are also not necessarily indicative of the future financial position or future
results of operations of the combined company. In particular, the Purchaser
expects to achieve significant operating cost savings as a result of the
Acquisition. See "Background of the Offer--Comparison of the Proposals." No
adjustment has been included in the pro forma amounts for the anticipated
operating cost savings.
 
<TABLE>
<CAPTION>
                                          NINE MONTHS ENDED     YEAR ENDED
                                          SEPTEMBER 30, 1995 DECEMBER 31, 1994
                                          ------------------ -----------------
<S>                                       <C>                <C>
WELLS FARGO & COMPANY COMMON STOCK
EARNINGS PER COMMON SHARE:
  Historical.............................      $ 14.14            $14.78
  Pro forma combined.....................        10.85             10.69
DIVIDENDS DECLARED PER COMMON SHARE:
  Historical.............................      $  3.45            $ 4.00
  Pro forma combined(1)..................         3.45              4.00
BOOK VALUE PER COMMON SHARE (AT PERIOD
 END):
  Historical.............................      $ 71.32            $66.77
  Pro forma combined(2)..................       144.67               N/A
FIRST INTERSTATE BANCORP COMMON STOCK
EARNINGS PER COMMON SHARE:
  Historical.............................      $  8.36            $ 8.71
  Pro forma equivalent(3)................         7.23              7.13
DIVIDENDS DECLARED PER COMMON SHARE:
  Historical.............................      $  2.30            $ 2.75
  Pro forma equivalent(3)................         2.30              2.67
BOOK VALUE PER COMMON SHARE (AT PERIOD
 END):
  Historical.............................      $ 47.95            $41.59
  Pro forma equivalent(3)................        96.45               N/A
</TABLE>
- --------
(1) Amounts represent historical dividends per common share.
(2) Amount is calculated by dividing total pro forma common stockholders'
    equity by the sum of total outstanding shares of Wells Fargo Common Stock
    plus new shares of Wells Fargo Common Stock to be issued in the Acquisition
    (based on the number of Shares outstanding at period end).
(3) Amounts are calculated by multiplying the Purchaser's pro forma combined
    amounts by the exchange ratio.
 
                                       10
<PAGE>
 
SELECTED CONSOLIDATED FINANCIAL DATA OF WELLS FARGO & COMPANY
 
  The selected consolidated financial data of the Purchaser set forth below
have been derived from the consolidated financial statements of the Purchaser
for each of the years in the five-year period ended December 31, 1994 and the
unaudited nine-month period ended September 30, 1995. The selected consolidated
financial data set forth below should be read in conjunction with and is
qualified in its entirety by the financial statements and accompanying notes
contained in the 1994 Wells Fargo 10-K and the Purchaser's Quarterly Report on
Form 10-Q for the period ended September 30, 1995, which are incorporated by
reference herein. See "Incorporation of Certain Information by Reference."
 
<TABLE>
<CAPTION>
                              NINE
                          MONTHS ENDED          YEAR ENDED DECEMBER 31,
                          SEPTEMBER 30, -------------------------------------------
                              1995       1994     1993     1992     1991     1990
                          ------------- -------  -------  -------  -------  -------
                           (UNAUDITED)
<S>                       <C>           <C>      <C>      <C>      <C>      <C>
(IN MILLIONS, EXCEPT PER
 SHARE DATA AND
 PERCENTAGES)
CONSOLIDATED SUMMARY OF
 INCOME
 Net interest income....     $ 1,987    $ 2,610  $ 2,657  $ 2,691  $ 2,520  $ 2,314
 Provision for loan
  losses................         --         200      550    1,215    1,335      310
 Noninterest income.....         890      1,200    1,093    1,059      889      909
 Noninterest expense....       1,638      2,156    2,162    2,035    2,020    1,717
 Net income.............         726        841      612      283       21      712
PER COMMON SHARE
 Net income.............     $ 14.14    $ 14.78  $ 10.10  $  4.44  $  0.04  $ 13.39
 Dividends declared.....        3.45       4.00     2.25     1.50     3.50     3.90
AVERAGE COMMON SHARES
 OUTSTANDING............        49.2       53.9     55.6     52.9     51.8     51.2
CONSOLIDATED PERIOD-END
 BALANCE SHEET DATA
 Investment securities..     $ 9,436    $11,608  $13,058  $ 9,338  $ 3,833  $ 1,387
 Loans..................      34,298     36,347   33,099   36,903   44,099   48,977
 Assets.................      49,934     53,374   52,513   52,537   53,547   56,199
 Deposits...............      38,948     42,332   41,644   42,244   43,719   42,685
 Senior and subordinated
  debt..................       3,020      2,853    4,221    4,040    4,220    2,417
 Stockholders' equity...       3,874      3,911    4,315    3,809    3,271    3,360
CONSOLIDATED AVERAGE
 BALANCE SHEET DATA
 Loans..................     $34,538    $34,039  $34,304  $40,406  $46,736  $44,061
 Assets.................      51,306     51,849   51,110   52,497   55,022   51,109
 Deposits...............      39,072     40,821   40,727   42,266   42,642   37,075
NET INTEREST MARGIN(1)..        5.72%      5.55%    5.74%    5.70%    5.18%    5.12%
CONSOLIDATED
 PROFITABILITY RATIOS(2)
 Net income to average
  total assets (ROA)....        1.89%      1.62%    1.20%    0.54%    0.04%    1.39%
 Net income applicable
  to common stock to
  average common
  stockholders' equity
  (ROE).................       27.91      22.41    16.74     7.93     0.07    25.07
CONSOLIDATED PERIOD-END
 CAPITAL RATIOS(3)
 Common stockholders'
  equity to assets......        6.78%      6.41%    7.00%    6.03%    5.24%    5.26%
 Stockholders' equity to
  assets................        7.76       7.33     8.22     7.25     6.11     5.98
CONSOLIDATED PERIOD-END
 LOAN DATA
 Allowance for loan
  losses................     $ 1,872    $ 2,082  $ 2,122  $ 2,067  $ 1,646  $   885
 Allowance for loan
  losses as a percentage
  of total loans........        5.46%      5.73%    6.41%    5.60%    3.73%    1.81%
 Nonaccrual and
  restructured loans....     $   600    $   582  $ 1,200  $ 2,142  $ 1,981  $ 1,013
 Nonaccrual and
  restructured loans as
  a percentage of total
  loans.................         1.8%       1.6%     3.6%     5.8%     4.5%     2.1%
CONSOLIDATED LOAN
 CHARGE-OFF DATA
 Net loan charge-offs...     $   210    $   240  $   495  $   798  $   572  $   168
 Net loan charge-offs as
  a percentage of
  average total
  loans(2)..............        0.81%      0.70%    1.44%    1.97%    1.22%    0.38%
</TABLE>
- --------
(1) Net interest margin is defined as net interest income on a taxable-
    equivalent basis divided by average total earning assets.
(2) Ratios for the nine months ended September 30, 1995 have been annualized.
(3) Based on the Federal Reserve Board's 1992 capital adequacy guidelines, the
    Purchaser's total risk-based capital ratio was 12.25%, 13.16%, 15.12%,
    13.15%, 10.19% and 9.27% at September 30, 1995, December 31, 1994, 1993,
    1992, 1991 and 1990, respectively. The Purchaser's Tier 1 risk-based
    capital ratio was 8.56%, 9.09%, 10.48%, 8.22%, 5.78% and 5.03% at September
    30, 1995, December 31, 1994, 1993, 1992, 1991 and 1990, respectively.
 
                                       11
<PAGE>
 
SELECTED CONSOLIDATED FINANCIAL DATA OF FIRST INTERSTATE BANCORP
 
  The following is a summary of selected consolidated financial data of the
Company for each of the years in the five-year period ended December 31, 1994
and the unaudited nine-month period ended September 30, 1995. This information
is derived from the financial statements of the Company contained in the 1994
Company 10-K (which, for purposes of this Prospectus, are not covered by the
report of the Company's independent accountants) and the Company's Quarterly
Report on Form 10-Q for the period ended September 30, 1995, which are
incorporated by reference herein. See "Incorporation of Certain Information by
Reference." The summary should be read in conjunction with and is qualified in
its entirety by reference to such financial statements.
 
<TABLE>
<CAPTION>
                              NINE
                          MONTHS ENDED          YEAR ENDED DECEMBER 31,
                          SEPTEMBER 30, --------------------------------------------
                              1995       1994     1993     1992     1991      1990
                          ------------- -------  -------  -------  -------   -------
                           (UNAUDITED)
<S>                       <C>           <C>      <C>      <C>      <C>       <C>
(IN MILLIONS, EXCEPT PER
 SHARE DATA AND
 PERCENTAGES)
CONSOLIDATED SUMMARY OF
 INCOME
 Net interest income....     $ 1,905    $ 2,327  $ 2,072  $ 2,015  $ 2,092   $ 2,303
 Provision for loan
  losses................         --         --       113      314      810       499
 Noninterest income.....         823      1,054      954      912    1,184     1,204
 Noninterest expense....       1,638      2,197    2,032    2,209    2,732     2,562
 Income (loss) before
  extraordinary items
  and cumulative effect
  of accounting
  changes...............         670        734      562      282     (288)      439
 Extraordinary items....         --         --       (25)     --       --        --
 Cumulative effect of
  accounting changes....         --         --       200      --       --         30
 Net income (loss)......         670        734      737      282     (288)      469
PER COMMON SHARE
 Income (loss) before
  extraordinary items
  and cumulative effect
  of accounting
  changes...............     $  8.36    $  8.71  $  6.68  $  3.23  $ (5.24)  $  6.79
 Net income (loss)......        8.36       8.71     8.96     3.23    (5.24)     7.30
 Dividends declared.....        2.30       2.75     1.60     1.20     1.80      3.00
AVERAGE COMMON SHARES
 OUTSTANDING(1).........        77.2       80.4     77.0     69.1     62.5      58.9
CONSOLIDATED PERIOD-END
 BALANCE SHEET DATA
 Investment Securities..     $ 9,432    $13,851  $16,542  $13,913  $ 8,496   $ 6,975
 Loans..................      35,967     33,222   25,988   24,201   28,182    33,007
 Assets.................      55,067     55,813   51,461   50,863   48,922    51,356
 Deposits...............      48,236     48,427   44,701   43,675   41,433    43,141
 Senior and subordinated
  debt..................       1,368      1,388    1,533    2,702    3,108     3,178
 Stockholders' equity...       3,981      3,436    3,548    3,251    2,639     2,868
CONSOLIDATED AVERAGE
 BALANCE SHEET DATA
 Loans..................     $35,157    $28,644  $24,128  $25,694  $30,691   $35,708
 Assets.................      55,629     52,979   49,319   49,031   49,126    54,205
 Deposits...............      47,792     46,313   42,540   41,196   41,051    43,982
NET INTEREST
 MARGIN(2)(3)...........        5.41%      5.14%    4.91%    4.89%    5.04%     5.06%
CONSOLIDATED
 PROFITABILITY RATIOS(3)
 Net income (loss) to
  average total assets
  (ROA).................        1.61%      1.38%    1.49%    0.57%   (0.59)%    0.86%
 Net income (loss)
  applicable to common
  stock to average
  common stockholders'
  equity (ROE)..........       25.40      21.56    23.24     9.63   (13.96)    19.56
CONSOLIDATED PERIOD-END
 CAPITAL RATIOS(4)(5)
 Common stockholders'
  equity to assets......        6.59%      5.53%    6.21%    5.18%    4.18%     4.82%
 Stockholders' equity to
  assets................        7.23       6.16     6.89     6.39     5.39      5.58
CONSOLIDATED PERIOD-END
 LOAN DATA
 Allowance for loan
  losses................     $   847    $   934  $ 1,001  $ 1,068  $ 1,273   $ 1,011
 Allowance for loan
  losses as a percentage
  of total loans........        2.35%      2.81%    3.85%    4.41%    4.52%     3.06%
 Nonaccrual and
  restructured loans....     $   140    $   186  $   227  $   578  $ 1,095   $   929
 Nonaccrual and
  restructured loans as
  a percentage of total
  loans.................         0.4%       0.6%     0.9%     2.4%     3.9%      2.8%
CONSOLIDATED LOAN
 CHARGE-OFF DATA
 Net loan charge-offs...     $   111    $   133  $   218  $   460  $   547   $   874
 Net loan charge-offs as
  a percentage of
  average total
  loans(3)..............        0.42%      0.46%    0.90%    1.79%    1.78%     2.45%
</TABLE>
- --------
(1) Includes dilutive effect of outstanding stock options (as determined by
    application of the treasury stock method).
(2) Net interest margin is defined as net interest income on a taxable-
    equivalent basis divided by average total earning assets.
(3) Ratios for the nine months ended September 30, 1995 have been annualized.
(4) Based on the Federal Reserve Board's 1992 capital adequacy guidelines, the
    Company's total risk-based capital ratio was 10.48%, 10.22%, 13.08%,
    13.87%, 10.61% and 9.40% at September 30, 1995, December 31, 1994, 1993,
    1992, 1991 and 1990, respectively. The Company's Tier 1 risk-based capital
    ratio was 7.48%, 7.20%, 9.88%, 9.40%, 6.28% and 5.63% at September 30,
    1995, December 31, 1994, 1993, 1992, 1991 and 1990, respectively.
(5) Calculated using period-end data derived from the information incorporated
    by reference to provide information comparable to that of the Purchaser.
    This information is disclosed by the Company in its Form 10-Q and 10-K,
    using average balances.
 
                                       12
<PAGE>
 
SELECTED UNAUDITED PRO FORMA COMBINED FINANCIAL DATA
 
  The following table sets forth certain selected historical financial data for
the Purchaser and the Company and selected pro forma combined financial data.
The pro forma amounts included in the table below assume completion of the
Acquisition and are based on the purchase method of accounting, a preliminary
determination and allocation of the total purchase price and the assumptions
described under "Pro Forma Combined Financial Information." This information
should be read in conjunction with and is qualified in its entirety by the
consolidated financial statements and accompanying notes of Purchaser and
Company included in the documents described under "Incorporation of Certain
Information by Reference" (but which, in the case of the Company, are not
covered by the report of the Company's independent accountants for purposes of
this Prospectus) and the pro forma combined financial statements and
accompanying discussion and notes set forth under "Pro Forma Combined Financial
Information." The pro forma amounts in the table below are presented for
informational purposes and are not necessarily indicative of the financial
position or the results of operations of the combined company that would have
actually occurred had the Acquisition been consummated as of the dates or for
the periods presented. The pro forma amounts are also not necessarily
indicative of the future financial position or future results of operations of
the combined company. In particular, the Purchaser expects to achieve
significant operating cost savings as a result of the Acquisition. See
"Background of the Offer--Comparison of the Proposals." No adjustment has been
included in the pro forma amounts for the anticipated operating cost savings.
 
<TABLE>
<CAPTION>
                                                NINE MONTHS ENDED                          YEAR ENDED
                                                SEPTEMBER 30, 1995                     DECEMBER 31, 1994
                                      -------------------------------------- --------------------------------------
                                               HISTORICAL                             HISTORICAL
                                      ----------------------------           ----------------------------
                                      WELLS FARGO FIRST INTERSTATE PRO FORMA WELLS FARGO FIRST INTERSTATE PRO FORMA
                                       & COMPANY      BANCORP      COMBINED   & COMPANY      BANCORP      COMBINED
                                      ----------- ---------------- --------- ----------- ---------------- ---------
<S>                                   <C>         <C>              <C>       <C>         <C>              <C>
(IN MILLIONS, EXCEPT PER SHARE DATA)
CONSOLIDATED SUMMARY OF INCOME
  Net interest income...............    $1,987         $1,905       $3,892     $2,610         $2,327       $4,937
  Provision for loan losses.........       --             --           --         200            --           200
  Noninterest income................       890            823        1,713      1,200          1,054        2,254
  Noninterest expense...............     1,638          1,638        3,618      2,156          2,197        4,835
  Net income........................       726            670        1,137        841            734        1,215
PER COMMON SHARE
  Net income........................    $14.14         $ 8.36       $10.85     $14.78         $ 8.71       $10.69
  Dividends declared................      3.45           2.30         3.45       4.00           2.75         4.00
AVERAGE COMMON SHARES OUTSTANDING...      49.2           77.2(1)      99.6       53.9           80.4(1)     106.5
</TABLE>
 
<TABLE>
<CAPTION>
                                                  SEPTEMBER 30, 1995
                                        --------------------------------------
                                                 HISTORICAL
                                        ---------------------------- ---------
                                        WELLS FARGO FIRST INTERSTATE PRO FORMA
                                         & COMPANY      BANCORP      COMBINED
                                        ----------- ---------------- ---------
<S>                                     <C>         <C>              <C>
CONSOLIDATED PERIOD-END BALANCE SHEET
 DATA
  Investment securities................   $ 9,436       $ 9,432      $ 18,868
  Loans................................    34,298        35,967        70,265
  Assets...............................    49,934        55,067       112,155
  Deposits.............................    38,948        48,236        87,184
  Senior and subordinated debt.........     3,020         1,368         4,388
  Stockholders' equity.................     3,874         3,981        15,009
</TABLE>
- --------
(1) Includes dilutive effect of outstanding stock options (as determined by
    application of the treasury stock method) for 1.5 million shares.
 
                                       13
<PAGE>
 
                            BACKGROUND OF THE OFFER
 
GENERAL
 
  On a number of occasions during the past several years, the Purchaser and
the Company have informally discussed the possibility of a merger of the two
companies. Following several meetings between the then Chief Executive
Officers of the Purchaser and the Company, on February 11, 1994, the Purchaser
submitted to the Company for its consideration a tax-free merger proposal. The
Company rejected this proposal.
 
  On September 7, 1995, Paul Hazen, Chairman and Chief Executive Officer of
the Purchaser, met with William Siart, Chairman and Chief Executive Officer of
the Company, to discuss the possibility of a merger of the two companies
again. No conclusions were reached, but Mr. Siart indicated that the Company
would probably not be prepared to consider a merger in the immediate future.
On the afternoon of October 17, 1995, Mr. Hazen telephoned Mr. Siart to inform
him that the Purchaser intended to deliver a letter containing a new merger
proposal to the Company and that Mr. Hazen would like to meet with Mr. Siart
later that day to deliver the letter in person and to discuss the proposal.
Mr. Siart asked for some time to consider the request, but called Mr. Hazen
back shortly thereafter to say that he saw no reason for the two of them to
meet. The Purchaser's letter was then delivered to the Company.
 
  On October 18, 1995, the Company and, shortly thereafter, the Purchaser
publicly announced that the Purchaser had made its Original Proposal to the
Company for a tax-free merger in which the Company's stockholders would
receive 0.625 of a share of Wells Fargo Common Stock for each Share. The
market reacted favorably to the announcement, with the Wells Fargo Common
Stock closing on that date at $229 per share, an increase of $15.375 (7.2%)
from its closing price the day before. Based on that market price, the
Original Proposal represented a $37.13 per Share, or 35%, premium to the
closing price per Share on the preceding day.
 
  On October 26, 1995, Mr. Siart and Mr. Hazen met again. At that meeting, Mr.
Siart acknowledged that a merger of the Company and the Purchaser would
enhance stockholder value. Mr. Hazen explained the cost savings estimates
being used by the Purchaser and offered to have the individuals at the
Purchaser who had prepared those estimates meet with their counterparts at the
Company in order to demonstrate that the expected cost savings were
achievable. After discussion, Mr. Siart declined that offer and stated that
the Company agreed with the Purchaser's cost savings estimates. Mr. Hazen then
offered to raise the exchange ratio in the Purchaser's proposal to 0.65 of a
share of Wells Fargo Common Stock for each Share if the Company would enter
into a merger agreement with the Purchaser. Mr. Siart rejected this increased
offer but indicated that the Purchaser might accept a merger with a 0.70
exchange ratio. Mr. Hazen stated that the Purchaser was unwilling to raise its
bid any further at that time.
 
  On October 31, 1995, Mr. Siart and Mr. Hazen again met. Mr. Hazen again
offered to have the individuals at the Purchaser who had prepared the cost
savings estimates meet with their counterparts at the Company in order to
demonstrate that the expected cost savings were achievable. Mr. Siart again
declined that offer and stated that the Company agreed with the Purchaser's
cost savings estimates. Mr. Siart indicated that he would be prepared to
recommend a merger with the Purchaser if the Purchaser would increase the
exchange ratio in its proposal to a 0.68 exchange ratio. Mr. Hazen replied
that he believed that an exchange ratio of 0.65 was a bid that was fair to the
stockholders of the Company and the Purchaser.
 
  On November 1, 1995, Messrs. Siart and Hazen talked again, this time by
telephone, but made no further progress towards an agreement. Mr. Hazen
attempted to reach Mr. Siart on November 2nd and November 3rd by telephone,
but his calls were not returned.
 
  On November 5, 1995, the Company, FBS and FBS Sub entered into the FIB/FBS
Merger Agreement pursuant to which FBS Sub and the Company would effect the
FIB/FBS Merger and each Share would be converted into the right to receive
2.60 shares of FBS Common Stock. Under the terms of the FIB/FBS Merger
Agreement, following the consummation of that merger, FBS would change its
name to First Interstate Bancorp and there would be an even split of the Board
of the combined company. The FIB/FBS Merger is subject to a number of
conditions which are identical in all material respects to the conditions of
the Offer, including among
 
                                      14
<PAGE>
 
others that all regulatory and stockholder approvals be obtained, although it
is also subject to an additional condition which is not a condition to the
Offer, namely that each of the Company and FBS shall have received a letter
from its accountants to the effect that the FIB/FBS Merger will qualify for
pooling of interests accounting treatment. Based on discussions with its
advisors, the Purchaser believes there is a significant question as to whether
the FIB/FBS Merger will qualify for pooling of interests accounting treatment
in light of the increased share repurchase program FBS announced in connection
with the FIB/FBS Merger. See "--Comparison of the Proposals--Purchase Versus
Pooling of Interests Accounting." As a further condition to the execution and
delivery of the FIB/FBS Merger Agreement, FBS and the Company executed
reciprocal transaction termination fee letter agreements providing for the
payment of "break-up" fees in certain circumstances (the "Reciprocal Fee
Letters") and reciprocal stock option agreements providing for the grant of
options to purchase each other's common stock in certain circumstances (the
"Reciprocal Stock Option Agreements"). The Company Board is permitted to
terminate the FIB/FBS Merger Agreement in a number of circumstances, including
if there exists a Takeover Proposal (as defined herein) for the Company and
the Company Board reasonably determines in good faith that termination is
necessary in the exercise of its fiduciary duties under applicable law. See
"--FIB/FBS Merger Agreement."
 
  The Company entered into the FIB/FBS Merger Agreement and certain "lock-up"
arrangements set forth in the Reciprocal Fee Letters and Reciprocal Stock
Option Agreements despite the fact that, based on the last available closing
prices per share prior to doing so, the FIB/FBS Merger produced a value (at
the 2.60 exchange ratio) of $132.28 per Share while the then current Purchaser
proposal produced a value (at the 0.65 exchange ratio) of $137.96 per Share,
or $5.68 per Share higher. In fact, based on the averages of the closing
prices per share on the 15 trading days (which 15 day trading period
encompasses the announcements of both proposals) prior to entering into the
FIB/FBS Merger Agreement, the FIB/FBS Merger produced a value of $132.15 per
Share while the then current Purchaser proposal produced a value of $139.41
per Share, or $7.26 per Share higher. Moreover, according to the Company
Schedule 14D-9, the Company entered into the FIB/FBS Merger Agreement (and
"lock-up" arrangements) despite the finding by one of its financial advisors
(Morgan Stanley & Co. Incorporated) that the Purchaser's Original Proposal (at
a 0.625 exchange ratio, or 6.3% below the exchange ratio being offered
pursuant to the Offer) was also fair from a financial point of view to the
stockholders of the Company.
 
  According to the Company Schedule 14D-9, FBS and certain other potential
merger candidates were afforded an opportunity to discuss with the Company's
financial advisors a possible business combination with the Company. The
Purchaser was not contacted by the Company's financial advisors and was not
afforded an opportunity to conduct due diligence on the Company or to receive
any confidential information.
 
  Despite these obstacles, on November 13, 1995, the Purchaser announced its
intention to offer to exchange two-thirds of a share of Wells Fargo Common
Stock for each Share. In a publicly released letter setting forth such offer,
Mr. Hazen again stated that the Purchaser would be prepared to enter into a
merger agreement with the Company providing for the same consideration as the
Offer. In the event that the Company did not elect to terminate the FIB/FBS
Merger Agreement, the Purchaser offered to agree to a process pursuant to
which both FBS and the Purchaser would each have 10 days to submit their best
and final merger proposals, which proposals would together be presented to the
Company's stockholders who could decide for themselves which proposal was in
their best interest. The Company did not respond to this proposal.
 
  As part of the November 13, 1995 announcement, the Purchaser also stated
that it anticipated filing (a) preliminary proxy solicitation materials with
the Commission for use in soliciting proxies from stockholders of the Company
against approval of the FIB/FBS Merger and (b) preliminary consent
solicitation materials with the Commission for use in soliciting written
consents from stockholders of the Company to replace the current members of
the Company Board with nominees who are committed to removing any obstacles to
the merger of the Company with the Purchaser. THIS PROSPECTUS AND THE OFFER
MADE HEREBY DO NOT CONSTITUTE A SOLICITATION OF ANY PROXIES OR CONSENTS FROM
THE COMPANY'S STOCKHOLDERS. ANY SUCH SOLICITATION WILL BE MADE ONLY PURSUANT
TO SEPARATE PROXY OR CONSENT SOLICITATION MATERIALS COMPLYING WITH THE
REQUIREMENTS OF SECTION 14(A) OF THE EXCHANGE ACT.
 
  The Purchaser also announced on November 13, 1995 the filing of a complaint
against the Company, the Company Board, FBS and FBS Sub in the Delaware
Chancery Court which, among other things, seeks to
 
                                      15
<PAGE>
 
invalidate the FIB/FBS Merger Agreement and the break-up fees and stock option
arrangements (commonly referred to as "lock-up" arrangements) granted to FBS
pursuant to the Reciprocal Fee Letters and the Reciprocal Stock Option
Agreements, respectively, and seeks injunctive relief requiring the Company
Board to redeem the Rights and to prevent the Company from using anti-takeover
devices or taking other actions intended to impede or delay the acquisition of
the Company by the Purchaser. For a further description of this litigation as
well as certain class action litigation brought against the Company, the
Company Board and FBS, see "--Litigation."
 
  On November 13, 1995, the Purchaser also filed an application with the
Federal Reserve Bank of San Francisco seeking approval of, among other things,
the Offer and the Merger. The Purchaser subsequently filed or will soon file
additional applications and notices with various governmental authorities
seeking all approvals required to permit consummation of the Offer and the
Merger. The Purchaser anticipates that it will obtain regulatory approvals on
a timely basis and believes that the regulators will consider the Purchaser's
applications for approval of the Offer and the Merger in a time frame
substantially identical to that of the FBS applications for approval of the
FIB/FBS Merger. See "The Offer--Regulatory Approval Condition." In this
regard, the Company Schedule 14D-9 states that the Company Board determined
"it was likely that each of FBS and Wells would ultimately receive all
[regulatory] approvals."
 
  On November 20, 1995, the Company Schedule 14D-9 was filed with the
Commission stating, among other things, that the Company Board was committed
to completing the FIB/FBS Merger and recommending that the Company's
stockholders not tender their Shares in the Offer.
 
  In the Company Schedule 14D-9, there is a detailed list of 16 factors
considered by the Company Board as material in selecting the FBS merger
proposal over the Purchaser's merger proposal. Conspicuously absent from that
list is any consideration of the implied purchase price produced by each of
the two proposals. At all times during the Company Board's consideration of
each Purchaser proposal and FBS proposal, the then current Purchaser proposal
has produced an implied purchase price significantly higher than the implied
purchase price produced by the then current FBS proposal. See "--Comparison of
the Proposals--Purchase Price."
 
COMPARISON OF THE PROPOSALS
 
  The Purchaser believes that the Company's stockholders, in comparing the
Purchaser's proposal to FBS's proposal, should concentrate on the two
components of value which characterize any stock for stock transaction with a
fixed exchange ratio, namely (i) the purchase price implied by the exchange
ratio and (ii) the value at which the acquiror's stock is expected to trade
when an agreement is announced or appears likely. The Purchaser is convinced
that its Offer is demonstrably superior on both counts. In addition, the
Purchaser believes the FBS proposal suffers from a significant contingency not
shared by the Offer (namely, the condition relating to pooling of interests
accounting treatment referred to below), and that many of the reasons why the
Company says it continues to support the FBS proposal rather than the
Purchaser's proposal are subject to serious question.
 
 Purchase Price
 
  The closing price per Share on October 17, 1995 (the day before the
announcement of the Original Proposal) was $106 and the average closing price
per Share for the 20 trading days preceding October 17, 1995 was $102.59. The
Offer provides a substantial premium to stockholders in relation to those
levels, as shown by the following table.
 
<TABLE>
<CAPTION>
                                                                PURCHASE PRICE
                                                                  PER SHARE
                                                                  IMPLIED BY
                                                              PURCHASER'S OFFER*
                                                              ------------------
<S>                                                           <C>
October 17, 1995 (day before announcement of Original
 Proposal)..................................................       $142.42
October 18, 1995 (day of announcement of Original Proposal).        152.67
November 22, 1995 (last full trading day before the date of
 this preliminary prospectus)...............................        142.25
</TABLE>
- --------
* Based on the closing price per share of Wells Fargo Common Stock on the
  indicated dates and an exchange ratio of two-thirds of a share of Wells
  Fargo Common Stock per Share.
 
 
                                      16
<PAGE>
 
  At each point when the Company Board considered the relative merits of an
FBS proposal against that of a Purchaser proposal, the then current Purchaser
proposal provided a significant premium to the then current FBS proposal, as
shown by the following table.
 
<TABLE>
<CAPTION>
                                   IMPLIED PURCHASE PRICE PER SHARE*
                         -----------------------------------------------------
                              RELEVANT            RELEVANT
                         PURCHASER PROPOSAL     FBS PROPOSAL      DIFFERENTIAL
                         ------------------ --------------------- ------------
<S>                      <C>                <C>                   <C>
October 30, 1995              $134.14           $115 to $125         $19.14
 (date of Company Board      (at a 0.65     (at an exchange ratio   to $9.14
 meeting at which         exchange ratio)    of 2.3 to possibly
 proposals from the                              2.5 as then
 Purchaser and FBS were                       indicated by FBS)
 first considered)
November 3, 1995               137.96              132.28             5.68
 (trading day before         (at a 0.65          (at a 2.60
 announcement of          exchange ratio)      exchange ratio)
 FIB/FBS Merger
 Agreement)
November 17, 1995              141.17              137.80             3.37
 (last trading day        (at a two-thirds       (at a 2.60
 before the Company's     exchange ratio)      exchange ratio)
 rejection of the
 Offer)
November 22, 1995              142.25              134.23             8.02
 (last full trading day   (at a two-thirds       (at a 2.60
 before date of this      exchange ratio)      exchange ratio)
 preliminary
 prospectus)
</TABLE>
- --------
 * Based on the closing price per share of the common stock of the Purchaser
   or FBS, as the case may be, on the indicated dates.
 
  Moreover, based on published reports, the market value of FBS's stock may
have been supported by an active stock repurchase program being maintained by
FBS. If so, the implied purchase price of FBS's proposal on various dates as
set forth above may be overstated and the differential between the implied
purchase price of the Purchaser's proposal and that of the FBS proposal on
various dates as set forth above may be understated.
 
  In addition, as shown by the following table, the exchange ratio offered by
the Purchaser pursuant to the Offer--two-thirds of a share of Wells Fargo
Common Stock for each Share--consistently demonstrates greater value for
stockholders than the FIB/FBS Merger.
 
<TABLE>
<CAPTION>
                                           IMPLIED PURCHASE PRICE PER SHARE*
                                        ---------------------------------------
                                        PURCHASER'S
                                        OFFER AT A  FIB/FBS MERGER
                                        TWO-THIRDS    AT A 2.60
BASED ON CLOSING                         EXCHANGE      EXCHANGE
   PRICES ON:                              RATIO        RATIO      DIFFERENTIAL
- ----------------                        ----------- -------------- ------------
<S>                                     <C>         <C>            <C>
October 17, 1995                          $142.42      $135.20        $ 7.22
 (trading day before announcement of
 Original Proposal)
October 18, 1995                          152.67        134.23         18.44
 (trading day of announcement of
 Original Proposal)
November 22, 1995                         142.25        134.23         8.02
 (last full trading day before date of
 this preliminary prospectus)
Average of indicated number of trading
 days preceding November 22, 1995:
10 Trading Days.......................     140.98       136.24          4.74
20 Trading Days.......................     140.52       133.45          7.07
30 Trading Days.......................     141.69       133.23          8.46
</TABLE>
- --------
 * Based on the closing price per share of the common stock of the Purchaser
   or FBS, as the case may be, for the indicated dates or periods.
 
 
                                      17
<PAGE>
 
 Value of Acquiror's Stock Following Acquisition
 
  On October 18, 1995, the day that the Purchaser publicly announced that it
had made a proposal to acquire the Company at an exchange ratio of 0.625 of a
share of Wells Fargo Common Stock per Share, the Purchaser's common stock
closed at $229.00 per share, an increase of $15.375, or 7.2% over its closing
price of $213 5/8 the day before. Since that time, Wells Fargo Common Stock
has declined, closing at $213 3/8 per share on November 22, 1995. The
Purchaser believes that such decline is largely due to market uncertainty
about whether the Purchaser will be able to overcome the obstacles to the
Offer being raised by the Company, and that such decline will be largely
reversed if the market recognizes that the Offer will be successful.
 
  The market's strong positive reaction to the Purchaser's October 18, 1995
announcement is in sharp contrast to the market's reaction to FBS's
announcement on November 6, 1995 that it had entered into the FIB/FBS Merger
Agreement. On November 6, 1995, the FBS Common Stock closed at $49.875 per
share, a decline of $1.00 per share or 2.0% from its prior close on November
3, 1995 of $50.875. As mentioned above, the increase in the FBS Common Stock
market price from $49.875 per share on November 6 to $51.625 on November 22,
1995 may be, at least in part, due to a substantial stock repurchase program
undertaken by FBS during this period.
 
  The Purchaser believes that the market's initial reactions to the
announcement of the Purchaser's Original Proposal and to the FIB/FBS Merger
Agreement are indicative of the values at which the respective stocks might
trade following the consummation of a merger with the Company. The Purchaser
further believes these reactions are based on a belief that an acquisition of
the Company by the Purchaser (as compared to an acquisition of the Company by
FBS) would (i) result in significantly more cost savings, (ii) be
significantly more accretive to earnings before amortization of intangibles
("Cash Earnings") per share and (iii) have a significantly more valuable
franchise going forward.
 
  Cost Savings. The Purchaser believes that if it were assumed to merge with
the Company on January 1, 1996, the cost to the Purchaser in 1996 to manage
the Company as part of a combined entity would be approximately $1.2 billion.
The Purchaser based that figure on a business line analysis of the Company's
noninterest expenses for the quarter ended June 30, 1995 after adjusting for
items such as (i) restructuring charges, (ii) lower Federal Deposit Insurance
Corporation ("FDIC") expenses, (iii) lower costs expected from a mortgage
alliance program recently announced by the Company, and (iv) amortization of
intangibles. The difference between the assumed $2.02 billion annual adjusted
noninterest expense of the Company on a stand alone basis (calculated by
annualizing the adjusted noninterest expenses of the Company for the quarter
ended June 30, 1995) and the expected $1.2 billion cost to manage the Company
as part of a combined entity represents the approximately $800 million in
annual cost savings that the Purchaser anticipates achieving within 18 months
of a merger with the Company. These savings are expected to result from (i)
the significant overlap which exists between the Purchaser's operations and
those of the Company in California, (ii) the proximity of the Purchaser's
operations in California and those of the Company in neighboring states, (iii)
the greater level of efficiency with which the Purchaser runs its franchise
when compared to the Company, and (iv) economies of scale. The Purchaser
estimates that it could experience up to $100 million of losses in revenue as
a result of combining the two companies, resulting in net cost savings of
approximately $700 million. As mentioned under "Background of the Offer--
General," Mr Siart, Chairman and Chief Executive Officer of the Company,
agreed with the Purchaser's cost savings estimates.
 
  By contrast, and in spite of having virtually no geographic overlap and
little proximity with the Company's franchise, FBS has projected expense
savings of approximately $500 million with no concurrent revenue loss. FBS
projects being able to achieve all those cost savings within six months of
consummating a transaction (only one-third of the time estimated by the
Purchaser). In addition, FBS has used as its starting point an estimate of the
noninterest expenses it expected the Company to incur in 1996 on a stand alone
basis (after adjusting for the amortization of intangibles) of $2.2 billion.
Deducting FBS's projected cost savings from that figure, the cost projected by
FBS to manage the Company as part of a combined entity can be estimated at
approximately $1.7 billion as compared to the $1.2 billion the Purchaser is
projecting, or a difference of approximately $500 million.
 
                                      18
<PAGE>
 
  Viewed another way, the difference between the $2.2 billion estimate used by
FBS for the Company's 1996 standalone expenses and the $1.2 billion estimate
used by the Purchaser for the cost to manage the Company as part of a combined
entity translates into a cost savings estimate of $1 billion resulting from a
Purchaser combination with the Company. It is this $1 billion cost savings
estimate which is directly comparable to the FBS cost savings estimate of $500
million resulting from an FBS combination with the Company.
 
  While both the Purchaser and FBS have represented that their cost savings
estimates are "conservative," the degree to which cost savings impacts the
creation of stockholder value requires that the Company's stockholders weigh
the likelihood of each acquiror's being able to achieve its respective cost
savings estimates. To assist the Company's stockholders in that analysis, the
table below compares those estimates to estimates in recent bank acquisitions,
although clearly no two transactions are identical.
 
  As shown by the table below, cost savings projected by FBS, when taken as a
percentage of the combined operating expenses of the Company and FBS (or of
the operating expenses of the smaller company), are two to three times greater
than those projected by other acquirors in similar market extension
transactions. This discrepancy is even more pronounced in light of the six
month timetable which FBS has projected for achieving the full cost savings
(which is considerably shorter than the time which other acquirors in similar
transactions have projected as being necessary). In marked contrast, the
Purchaser's estimated cost savings and implementation schedule are
considerably more consistent with those in similar in-market acquisitions.
 
                                      19
<PAGE>
 
        COST SAVINGS ESTIMATES FOR BANK TRANSACTIONS ANNOUNCED IN 1995 
                    WITH VALUES GREATER THAN $1 BILLION(1)
 
<TABLE>
<CAPTION>
                                                                   COST SAVINGS ESTIMATES
                                                              ---------------------------------
                                                                 AS A
                                                              PERCENTAGE
                                                              OF SMALLER
                                                              (IN TERMS     AS A
                                                              OF ASSETS) PERCENTAGE   TIME TO
                                   OWNERSHIP                  COMPANY'S  OF COMBINED  ACHIEVE
                                   SPLIT OF                   OPERATING   OPERATING     100%
                         ANNOUNCE- COMBINED     DEAL VALUE     EXPENSE     EXPENSE      COST
                         MENT DATE ENTITY(2) (IN BILLIONS)(3)  BASE(4)     BASE(4)   SAVINGS(2)
                         --------- --------- ---------------- ---------- ----------- ----------
<S>                      <C>       <C>       <C>              <C>        <C>         <C>
MARKET EXTENSION TRANSACTIONS
US Bancorp/West One.....   05/08     64/36        $ 1.6           23%          7%      12-15Mos.
First Union/First
 Fidelity...............   06/19     61/39          5.6           18           5          24
First Chicago/NBD.......   07/12     50/50          5.1           15           6        6-12
Boatmen's/Fourth
 Financial..............   08/25     80/20          1.2           24           4          21
National City/Integra...   08/28     70/30          2.1           21           5           6
AVERAGE                                                           20%          5%      14-16MOS.(5)
FIRST BANK SYSTEM/
 FIRST INTERSTATE.......   11/06     42/58        $10.3           42%         15%          6MOS.
IN-MARKET ACQUISITIONS
Fleet/Shawmut...........   02/21     59/41        $ 3.6           44%         14%         15Mos.
PNC/Midlantic...........   07/10     67/33          3.0           30           7          12
Chemical/Chase..........   08/28     58/42          9.9           35          16          21
UJB/Summit..............   09/11     64/36          1.1           48          12           9
CoreStates/Meridian.....   10/10     63/37          3.2           35          11           6
AVERAGE                                                           38%         12%         13MOS.(5)
WELLS FARGO/FIRST
 INTERSTATE.............   11/13     48/52        $10.9           37%         18%         18MOS.
</TABLE>
- --------
(1) The NationsBank/Bank South transaction has been omitted because one party
    was far larger (in terms of assets) than the other and the pro forma
    ownership split was 90/10.
(2) Source: Investor presentations.
(3) Source: SNL Securities. The Chemical/Chase transaction excludes the
    preferred stock.
(4) Cost savings estimates as a percentage of operating expense base for US
    Bancorp/West One, UJB/Summit, and CoreStates/Meridian were based on
    investor presentations. Other cost savings estimates as a percentage of
    operating expense base were obtained by dividing cost savings estimates
    from investor presentations by second quarter 1995 annualized noninterest
    expense, with the exception of Fleet/Shawmut which is based on the
    annualized first quarter 1995 noninterest expense base and First Bank
    System/First Interstate and Wells Fargo/First Interstate which are based
    on the annualized third quarter 1995 noninterest expense base where First
    Interstate's expense base is adjusted for restructuring charges and other
    items.
(5) Among the transactions in the table, the larger, and therefore presumably
    more complex transactions (i.e., those with a deal value in excess of $5.0
    billion), average 17-19 months as the estimated time to achieve 100% cost
    savings.
 
  In addition, FBS's projections do not appear to provide for a special
assessment on Savings Association Insurance Fund ("SAIF") deposits,
notwithstanding pending legislation which would impose such an assessment on
FBS's SAIF deposits. The Purchaser has no SAIF deposits and, therefore, would
not be affected by such legislation.
 
  Also, the FBS estimates do not make any allowances for revenue loss despite
the fact that 32% of the cost reductions projected by FBS come directly from
business lines, where cost reductions will have a direct impact on customers.
The Purchaser's estimates, in contrast, make appropriate allowances for
possible revenue loss in keeping with the Purchaser's goal of ensuring that
its overall estimates are conservative.
 
                                      20
<PAGE>
 
  The Company's and FBS's claim that a merger with the Purchaser would involve
greater revenue loss than $100 million is, once again, at odds with the
projections in other bank mergers (banks have generally not projected material
revenue loss in connection with acquisitions, even where divestitures are
expected to be required) and is also at odds with the Company's assertion that
there would be no material revenue loss as a result of the proposed FIB/FBS
Merger. In addition, the claim is at odds with the Purchaser's own acquisition
experience, particularly its experience with the Crocker National acquisition
described below.
 
  Moreover, FBS has no proven track record at successfully integrating large
acquisitions. Although the acquisition of the Company by FBS and a pending FBS
merger with FirsTier Financial would mean that FBS would be simultaneously
integrating institutions with assets aggregating over 178% of FBS's total
assets, the largest bank acquisition which FBS has undertaken to date
represented less than 20% of its total assets at the time of announcement
(Metropolitan Financial, a thrift institution, represented 30% of total assets
at the time of announcement). By contrast, the Purchaser's only pending
acquisition is its Offer for the Company, and the Purchaser has a proven track
record of successfully completing a similar integration when it acquired
Crocker National in 1986 (Crocker National represented approximately 70% of
the Purchaser's total assets at that time).
 
  FBS has claimed that the Purchaser would experience greater revenue loss
than estimated, because deposit attrition of 15% to 40% has occurred in
California in-market acquisitions such as the Purchaser's acquisition of
Crocker National. The Purchaser's experience with respect to its Crocker
National acquisition was materially different than that claimed by FBS.
 
  The following table sets forth the Purchaser's and Crocker National's
deposits in California (excluding time deposits greater than $100,000),
branches remaining and branches closed (as a percentage of the original number
of branches of Crocker National) at March 31, 1986 and at various dates
following the May 31, 1986 acquisition of Crocker National. Demand deposits
are also shown because the usual quarter end fluctuations in these deposits
(typically with offsetting fluctuations in float) can produce variations in
the trend line. Deposits grew by 3.4% by year end 1987, despite the closure of
182 branches (a 29% reduction of all branches, or a 57% decline of branches
relative to the Crocker National totals at the time of that merger). The
deposit growth numbers are conservative because approximately $200 million of
deposits divested for antitrust reasons were not subtracted from the starting
base level of deposits. The table excludes time deposits greater than $100,000
because Crocker National had a significant amount of these deposits sourced
through their funding desk which were allowed to run off following the
acquisition. Even if these deposits over $100,000 were included, total
deposits would have experienced no significant decrease.
 
<TABLE>
<CAPTION>
                                PURCHASER'S AND CROCKER NATIONAL'S CALIFORNIA
                                                   DEPOSITS
                              --------------------------------------------------
                               CALIFORNIA DEPOSITS
                                 (EXCLUDING TIME              CUMULATIVE NUMBER
                                DEPOSITS GREATER              OF BRANCHES CLOSED
                                 THAN $100,000)                AS PERCENTAGE OF
                              ---------------------           ORIGINAL NUMBER OF
                               DEMAND               NUMBER OF  CROCKER NATIONAL
                              DEPOSITS OTHER TOTAL* BRANCHES       BRANCHES
                              -------- ----- ------ --------- ------------------
(DOLLARS IN BILLIONS)
<S>                           <C>      <C>   <C>    <C>       <C>
March 31, 1986...............   $6.7   $19.8 $26.5     621           --
June 30, 1986................    7.0    19.7  26.6     619             1%
September 30, 1986...........    6.9    20.7  27.7     568            17
December 31, 1986............    8.0    21.0  28.9     513            34
March 31, 1987...............    6.4    21.3  27.7     458            51
June 30, 1987................    6.3    21.1  27.4     449            54
September 30, 1987...........    6.2    21.0  27.1     442            56
December 31, 1987............    6.3    21.1  27.4     439            57
</TABLE>
- --------
* Components may not sum to total due to rounding.
 
  Accretion Projections. Both the Purchaser and FBS have publicly disclosed
the pro forma impact of their respective proposed transactions on their future
earnings per share, given their base case assumptions. Because of the
different accounting treatments sought by the Purchaser and FBS, the Purchaser
believes that its projected accretion in Cash Earnings per share is most
comparable to FBS's projected accretion in reported earnings per share.
 
                                      21
<PAGE>
 
  In its investor presentation materials dated November 6, 1995, FBS estimates
that a merger with the Company would result in accretion in its reported
earnings per share in 1996, 1997 and 1998 of 1%, 18% and 22%, respectively.
However, even beyond the uncertainty over the level of operating cost savings
achievable by FBS as described above, the Purchaser believes that the
methodology used by FBS in arriving at its accretion projections is
questionable. In projecting accretion to earnings from a base (i.e. stand
alone) case, FBS and the Company assume no share repurchases in that base case
for 1996 and 1997, and presumably thereafter. (See pages 23-25 of FBS's
investor presentation materials dated November 6, 1995.) The Purchaser
believes that it would be more appropriate for the base case to assume a
continuation of FBS's current buyback program. If that premise were adopted,
FBS's base earnings per share would be higher in the future and the accretion
percentages would be lower than suggested by FBS. The magnitude of the
differences between earnings per share accretion over a base case with and
without the leverage of an established share repurchase program is pronounced.
FBS has suggested its earnings per share accretion resulting from the FIB/FBS
Merger will be 18% in 1997 rising to 25% in the year 2000. If, however, share
repurchases were assumed in the stand alone FBS case, the results would be
markedly different. Assuming, as the Purchaser did in its estimates, that
sufficient stock would be repurchased to keep capital constant after a
constant percentage dividend payout ratio, the base case would rise and the
accretion above that base case would be lower. The Purchaser estimates that
the accretion for FBS would drop to 12% and 6%, respectively, for the years
1997 and 2000, instead of the 18% and 25% FBS has claimed.
 
  The Purchaser has estimated its earnings accretion from a base case which
assumes a share repurchase program and uses the same base revenue and expense
assumptions for the Company as were used by FBS. Based on these assumptions,
the Purchaser estimates that the Merger with the Company would result in
accretion to its Cash Earnings per share in 1996, 1997 and 1998 of 14%, 38%
and 42%, respectively, and to its reported earnings per share in 1996, 1997
and 1998 of (2)%, 18% and 23%, respectively.
 
  Value of Franchise. At the base of every banking institution's operations is
the institution's relationship with its present and prospective customers,
individuals and corporations doing business as borrowers and depositors or
obtaining other services from the institution. A banking institution's
opportunities for the future necessarily depend on the economic base and
economic potential of the territory it serves, which can be measured in terms
such as population and population growth, retail sales, households, industrial
production and employment, as well as the institution's market share in the
territory it serves. The Purchaser has a history of success with individual
and small business customers. The Purchaser is also known for its expertise in
the area of alternative delivery as it conducts business with many of its
customers via phone, ATMs, supermarkets and electronically through the
Internet. The Purchaser currently ranks as the second largest California based
bank with total deposits of approximately $37 billion and with a market
presence that is geographically broad based as the Purchaser operates
throughout the entire state.
 
  With the proposed combination with the Company, the Purchaser will solidify
its position in California with deposits of approximately $58 billion.
Additionally, through the presence of the Company in other western states, the
new company will rank number one, two, or three in terms of deposits in four
states (California, Oregon, Arizona and Nevada). The population of California
(approximately 31 million), coupled with the population of the Company's
territory outside California (approximately 43 million), represent 28% of the
country's population and the states represented are some of the fastest
growing in the country. The combination of the Purchaser and the Company would
benefit not only from the current economic turnaround of California but also
from the above average growth of the other western states in which the
combined entity would be doing business.
 
  FBS's territory, by contrast, is much smaller and less populous and has
growth prospects that are lower than the geographic region in which the
Company operates. Thus, when viewing the two respective franchises, the
Purchaser believes a Purchaser/Company combination with its deeper penetration
of the populous California market coupled with the rapid growing western
states covered by the Company is preferable to an FBS/Company combination with
its diversification into a geographical area which would dilute the economic
growth prospects for Company stockholders. Put differently, a combination of
the Purchaser and the Company would span fewer states than would a combination
of FBS and the Company, but the population of the states where the Purchaser
and the Company combined would rank number one, two or three in terms of
deposits would be approximately
 
                                      22
<PAGE>
 
40 million while the population of the states where FBS and the Company
combined would rank number one, two or three in terms of deposits would be
only approximately 21 million.
 
 
  Purchase Versus Pooling of Interests Accounting. The Purchaser's and FBS's
proposals differ in that the Purchaser contemplates using the purchase method
of accounting to account for the acquisition of the Company while FBS's
proposal is conditioned upon the receipt from FBS's accountants of an opinion
to the effect that the acquisition will qualify for pooling of interests
accounting treatment. Based on discussions with its advisors, the Purchaser
believes there is a significant question as to whether the FIB/FBS Merger will
qualify for pooling of interests accounting treatment in light of the
increased share repurchase program that FBS has announced in connection with
the FIB/FBS Merger. FBS's investor presentation of November 6, 1995
contemplates that up to approximately 14% of its pro forma outstanding shares
will be repurchased in the 18 months that follow the transaction. In addition,
FBS has stated that approximately 8% of the outstanding Shares will be tainted
Shares (i.e., certain Shares which it has repurchased within the preceding two
years) at the acquisition date.
 
  The Purchaser believes there is no meaningful economic difference between
purchase accounting and pooling of interests accounting. The pro forma levels
of tangible capital are identical, regardless of whether purchase or pooling
of interests accounting is utilized. Although under purchase accounting
goodwill and other intangibles will be recorded in the transaction and
amortized over time (with the result that reported net income will be lower),
amortization is not a cash expense and thus the true earnings power of the
institution, as represented by reported earnings before amortization of
intangibles (i.e., Cash Earnings), is completely unaffected.
 
  The Purchaser determined to use purchase accounting because it does not
require the reissuance of previously repurchased shares and allows greater
flexibility in repurchasing shares after completion of the transaction than
that which is available given current accounting practices under pooling of
interests accounting. The Purchaser has historically had a share repurchase
program designed to return excess capital being generated by its operations to
stockholders. The Purchaser believes that utilizing pooling of interests
accounting would limit its ability to continue to return excess capital to
stockholders by way of share repurchases for a significant period of time
after completion of the transaction.
 
  Response to Certain Assertions in the Company Schedule 14D-9. The Company
has set forth in the Company Schedule 14D-9 the reasons why the Company Board
continues to support the FBS proposal rather than the Purchaser's proposal.
Many of these reasons are, in the Purchaser's opinion, subject to serious
question.
 
  . Although the Company stresses that a combined FBS/Company entity would
    gain a top three ranking (in terms of deposits) in seven additional
    states, five of these states are Montana, Nebraska, North Dakota, South
    Dakota and Wyoming, which have a combined population of less than 4.5
    million. In fact, the population of the states where the Purchaser and
    the Company combined would have a top three ranking (in terms of
    deposits) is approximately 40 million while the population of the states
    where FBS and the Company combined would have such a ranking is only
    approximately 21 million.
 
  . Although the Company maintains that diversification of assets outside
    California reduces risk and therefore is an important consideration, the
    Company's serious financial problems in the early 1990's were widely
    attributed to credit quality and other problems in its units outside
    California, primarily Arizona and Texas.
 
  . The Company claims to have had a "longstanding desire" to achieve greater
    geographic diversification, but four out of its five most recent
    significant acquisitions (based on asset size as set forth on page 32 of
    the Company's 1994 Annual Report) have been in California. Further, the
    Company has sold its operations in Oklahoma and part of its operations in
    New Mexico. The Company expressed specific concern about the Purchaser's
    real estate loan concentration in California, but between 1993 and 1994
    the Company increased its total California real estate loans by 151% and
    its California commercial real estate loans by 78%.
 
  . The Company expresses concern that the trading price of the Wells Fargo
    Common Stock in relation to book value and earnings is among the highest
    in the banking industry, but this is also true of FBS's common stock.
 
                                      23
<PAGE>
 
  . The Company expresses concern about revenue loss in a Purchaser/Company
    combination because of significant divestiture requirements. However, the
    Purchaser is convinced that the proposed divestiture amount of $905
    million would not lead to any material net revenue loss from
    divestitures. In fact, banks have generally not projected material
    revenue loss in connection with acquisitions, even where divestitures are
    expected to be required.
 
  . The Company suggests that the cost savings projected for the FIB/ FBS
    Merger are achievable without significant revenue loss (in purported
    contrast to the Purchaser's proposal), but the comparable transactions
    noted above would suggest that the level of cost savings projected by FBS
    is highly ambitious and, at least recently, unprecedented for a large out
    of market transaction.
 
  . The Company attempts to contrast FBS's acquisition integration record
    with that of the Purchaser on the basis that the Purchaser has not
    managed the process of consummating a "significant" bank acquisition
    since 1988. However, the current FBS management has never consummated an
    acquisition comparable to the Purchaser's acquisition of Crocker
    National, which represented 70% of assets at the time, and none of FBS's
    recent acquisitions represented more than 30% of FBS's total assets at
    the time of announcement.
 
  . The Company suggests that the Purchaser has fewer product lines and lower
    revenue growth opportunities. However, the Purchaser funded a number of
    growth initiatives in 1995 which translated into substantial revenue
    growth between the second and third quarters of this year, while the
    Company and FBS (after subtracting a non-recurring gain) had declining
    revenue between such periods. The growth initiatives for the Purchaser
    included supermarket banking, small business lending, consumer lending
    and direct distribution. The Purchaser sees substantial revenue growth
    opportunities in a merger with the Company, both in these areas and in
    commercial lending, trust and investment management. In addition, the
    Purchaser notes that FBS's noninterest income in relation to assets is
    currently lower than the comparable ratio for the Purchaser.
 
  . The Company expresses concern about the Purchaser's greater exposure to
    real estate lending, which "is inconsistent with First Interstate's
    credit philosophy." However, between 1993 and 1994 the Company's total
    real estate loans increased by 61% and its commercial real estate loans
    increased by 33%.
 
  . Although the Company expresses concern that the Purchaser's proposed
    transaction would be accounted for as a purchase rather than a pooling of
    interests, (a) in the twelve acquisitions announced by the Company since
    1991, ten were accounted for as purchases and only two were accounted for
    as poolings of interests, and (b) in the eleven acquisitions announced by
    FBS since 1991 for which information is available, ten were accounted for
    as purchases and only one was accounted for as a pooling of interests.
 
  . The Company claims that it shares a common deposit system with FBS, while
    the Purchaser utilizes a system which is incompatible with the Company's.
    However, the Purchaser also has a number of systems in common with the
    Company. The Purchaser believes that these common systems between FBS and
    the Company and the Purchaser and the Company would merely simplify
    initial customer conversions and do not impact overall systems efficiency
    which depends on interactions between systems and systems architecture.
    The Purchaser believes that its systems architecture which is based on an
    open network and distributed computing provides it with a substantial
    systems advantage with respect to new product development and ongoing
    operating efficiency.
 
LITIGATION
 
  On November 13, 1995, the Purchaser filed a complaint in the Delaware Court
of Chancery against the Company, the Company Board, FBS and FBS Sub. The
complaint seeks, among other things, (i) a declaration that the Company
Board's approval of the FIB/FBS Merger Agreement, the agreement to pay FBS
$100 million in break-up fees pursuant to the Reciprocal Fee Letters and the
grant to FBS of a lock-up stock option with a value of up to $100 million
pursuant to the Reciprocal Stock Option Agreements constituted breaches of the
Company Board's fiduciary duties and, therefore, that the FIB/FBS Merger
Agreement, break-up fees and the lock-up stock option granted to FBS are void
and unenforceable; (ii) an injunction compelling the Company
 
                                      24
<PAGE>
 
Board to terminate the FIB/FBS Merger Agreement and such fees and option and
prohibiting the Company Board from including such fees and option or any
similar provision in any modified or future agreement with FBS; (iii) an
injunction compelling the Company Board to declare the Offer to be a
"Qualified Offer," as defined in the Rights Agreement, or, alternatively,
compelling the Company to redeem the Rights or to amend the Rights to make
them inapplicable to the Offer and the Merger; (iv) an injunction against the
adoption by the Company of any defensive measures to thwart the Offer or the
consummation of the Merger; and (v) a declaration that the Offer and any
subsequent merger are exempt from Section 203 of the DGCL pursuant to Section
203(b)(6) of the DGCL or, alternatively, an injunction compelling the Company
Board to approve the Offer for purposes of Section 203 of the DGCL.
 
  Certain present and former members of the Company Board have been named as
defendants in several stockholder class action suits filed in California, and
certain present members of the Company Board and the Company have been named
as defendants in several stockholder class action suits filed in Delaware,
alleging that the Company Board will breach or has breached its fiduciary
duties to the stockholders of the Company in responding to the Purchaser's
Original Proposal.
 
  Five Delaware actions were filed on October 18 and 19, 1995 in Delaware
Chancery Court. On October 27, 1995, these five actions were consolidated into
a single action. On November 13, 1995, the Delaware plaintiffs sought leave to
file a Second Amended and Supplemental Class Action Complaint (the "Second
Amended Complaint"). Among other things, the proposed Second Amended Complaint
seeks to add FBS as a defendant and to assert aiding and abetting claims
against it. Among other claims, the proposed Second Amended Complaint alleges
that the Company defendants breached their fiduciary duties by failing to
conduct a fair bidding contest for the Company. In addition, it alleges that
the defendants have implemented certain measures which may impede any proxy
solicitation or consent solicitation that the Purchaser may undertake. The
plaintiffs seek a variety of injunctive and other relief, including an order
enjoining the FIB/FBS Merger and a declaration that the break-up fees and the
lock-up stock option granted to FBS pursuant to the Reciprocal Fee Letters and
Reciprocal Stock Option Agreements, respectively, are null and void.
 
  Six class actions have been filed in the Superior Court of the State of
California, County of Los Angeles. The complaints filed in the six California
actions are similar and allege that the members of the Company Board will
breach or have breached their fiduciary duty in responding to the Purchaser's
Original Proposal and the Offer. In addition, these complaints allege
negligent breach of fiduciary duty, abuse of control and tortious interference
with prospective economic advantage. The plaintiffs in the California actions
seek declaratory relief as well as permanent and preliminary injunctive relief
enjoining the defendants from taking steps to prevent or frustrate the sale of
the Company to the Purchaser. In addition, the plaintiffs seek compensatory
damages of an unspecified amount and costs including attorneys fees.
 
FIB/FBS MERGER AGREEMENT
 
  The FIB/FBS Merger. According to the Current Report on Form 8-K of the
Company dated November 5, 1995 (the "First Interstate 8-K"), the FIB/FBS
Merger Agreement provides that FBS Sub would be merged with and into the
Company, with the Company being the surviving corporation as a wholly owned
subsidiary of FBS. The FIB/FBS Merger would become effective at the time
specified in the certificate of merger (the "Effective Time"), which must be
filed with the Secretary of State of the State of Delaware no later than two
business days after the satisfaction or waiver of the latest to occur of the
conditions summarized below under "--Conditions to the FIB/FBS Merger."
 
  Consideration. Under the terms of the FIB/FBS Merger Agreement, each
outstanding Share (excluding Shares held in treasury by the Company or
directly or indirectly by FBS, the Company or any of their respective
subsidiaries, but including Shares (i) held directly or indirectly by FBS or
the Company or any of their respective subsidiaries in trust accounts, managed
accounts and the like or otherwise held in a fiduciary capacity that are
 
                                      25
<PAGE>
 
beneficially owned by third parties or (ii) held by FBS or the Company or any
of their respective subsidiaries in respect of a debt previously contracted),
including the Rights attached thereto, would be converted into the right to
receive 2.60 shares (the "Common Exchange Ratio") of the FBS Common Stock,
together with the number of rights (the "FBS Rights") issued pursuant to the
Rights Agreement, dated as of December 21, 1988, between FBS and Morgan
Shareholder Services Trust Company, as Rights Agent, as amended (the "FBS
Rights Agreement"). In addition, pursuant to the FIB/FBS Merger Agreement,
each outstanding option granted by the Company to purchase Shares would be
converted into an option to purchase FBS Common Stock in the number and at an
exercise price consistent with the Common Exchange Ratio. In addition,
pursuant to the FIB/FBS Merger Agreement, each outstanding share of 9 7/8%
preferred stock, Series F, and each outstanding share of 9.00% preferred
stock, Series G, of the Company (collectively, the "First Interstate Preferred
Stock"), would be converted into one share of 9 7/8% preferred stock and 9.00%
preferred stock, respectively, of FBS (collectively, the "New FBS Preferred
Stock") with substantially the same terms as the corresponding series of First
Interstate Preferred Stock, provided that the New FBS Preferred Stock shall
have the voting rights necessary to ensure that FIB/FBS Merger constitutes a
reorganization within the meaning of Section 368(a) of the Code.
 
  Representations and Warranties. The FIB/FBS Merger Agreement contains
certain representations and warranties of the Company including, among other
things: (a) that no consents or approvals of any governmental entity or third
party which is not a governmental entity are necessary to consummate the
FIB/FBS Merger and the other transactions contemplated by the FIB/FBS Merger
Agreement, except as disclosed in the FIB/FBS Merger Agreement or, in the case
of consents or approvals from third parties which are not governmental
entities, the failure of which to obtain will not have and would not be
reasonably expected to have a material adverse effect on the Company; (b) that
the Company and each of its subsidiaries have timely filed all material
reports, registrations and statements required to be filed since January 1,
1993 with certain specified regulatory agencies, and that except for normal
examinations conducted by the foregoing regulatory agencies in the regular
course of the Company's business and except as disclosed in FIB/FBS Merger
Agreement, no regulatory agency has initiated any proceeding or investigation
into the business or operations of the Company or its subsidiaries since
January 1, 1993; (c) as to brokers; (d) that there has been no event since
June 30, 1995, except as disclosed in its documents filed with the Commission
prior to the date of the FIB/FBS Merger Agreement, that has had or would
reasonably be expected to have, individually or in the aggregate, a Material
Adverse Effect (as defined in the FIB/FBS Merger Agreement and as used in this
paragraph, a "Material Adverse Effect") on the Company or the surviving
corporation; (e) as to employee compensation; (f) as to actions and
proceedings pending or threatened against the Company; (g) as to employee
benefit plans; (h) that the documents filed by the Company with the Commission
since January 1, 1994 did not contain any untrue statement of material fact
and did not omit any material fact necessary to make the statements therein
not misleading; (i) as to governmental licenses and permits, and compliance
with laws, including relevant tax laws; (j) as to material contracts; (k) as
to agreements with regulatory agencies; (l) that neither the Company nor any
of its subsidiaries has incurred since June 30, 1995, except as disclosed in
the Company's Quarterly Report on Form 10-Q for the period ended June 30, 1995
and for liabilities in the ordinary course of business consistent with past
practice, any liability of any nature whatsoever that, either alone or when
combined with all similar liabilities, has had, or would reasonably be
expected to have, a Material Adverse Effect on the Company; (m) as to state
takeover laws; (n) that the information to be provided by the Company and its
subsidiaries in the registration statement and the joint proxy statement in
connection with the FIB/FBS Merger Agreement will not contain any untrue
statement of a material fact or omit to state a material fact necessary to
make the statements therein not misleading; (o) as to compliance with
environmental laws and worker safety laws; and (p) that all interest rate risk
management arrangements have been entered into in accordance with prudent
banking practices and are legal, valid and binding obligations of the Company
or its subsidiaries and, to the Company's knowledge, there are no breaches,
violations or defaults or allegations thereof by any party thereunder which
would have or would be reasonably be expected to have a Material Adverse
Effect on the Company. In addition, the FIB/FBS Merger Agreement contains
representations and warranties by the Company as to, among other things, its
organization, capitalization, ownership of its material subsidiaries and
authority to enter into the FIB/FBS Merger Agreement and the binding effect of
the FIB/FBS Merger Agreement.
 
  The FIB/FBS Merger Agreement also contains similar representations and
warranties of FBS.
 
                                      26
<PAGE>
 
  Conditions to the FIB/FBS Merger. (a) The respective obligations of each
party to effect the FIB/FBS Merger are subject to the satisfaction at or prior
to the Effective Time of the following conditions:
 
  (i) The FIB/FBS Merger shall have been approved by the holders of a majority
of the Shares. In addition, the issuance of FBS Common Stock pursuant to the
FIB/FBS Merger Agreement shall have been approved by the affirmative vote of
the holders of a majority of the shares of FBS Common Stock voting at a
meeting of stockholders and the amendment of the FBS Certificate of
Incorporation to (A) increase the number of authorized shares of the FBS
Common Stock to 500,000,000 and increase the number of authorized shares of
FBS Preferred Stock to 15,000,000 and (B) change the name of FBS to First
Interstate Bancorp, shall have been approved by the affirmative vote of the
holders of a majority of the outstanding shares of FBS Common Stock.
 
  (ii) The shares of FBS Common Stock issuable upon consummation of the
FIB/FBS Merger shall have been authorized for listing on the NYSE, subject to
official notice of issuance.
 
  (iii) All regulatory approvals required to consummate the transactions
contemplated by the FIB/FBS Merger shall have been obtained and shall remain
in full force and effect, all statutory waiting periods in respect thereof
shall have expired and no such approval shall contain any conditions or
restrictions which the Board of Directors of either FBS or the Company
reasonably determines in good faith will have or reasonably be expected to
have a Material Adverse Effect on the combined company and its subsidiaries
taken as a whole. The required regulatory approvals would be substantially the
same as those required by the Purchaser for the Offer and the Merger. See "The
Offer--Regulatory Approval Condition."
 
  (iv) The registration statement on Form S-4 for the FBS Common Stock shall
have become effective under the Securities Act and no stop order suspending
the effectiveness thereof shall have been issued and no proceedings for that
purpose shall have been initiated or threatened by the Commission.
 
  (v) No order, injunction or decree issued by any court or agency of
competent jurisdiction or other legal restraint or prohibition preventing the
consummation of the FIB/FBS Merger or any of the other transactions
contemplated by the FIB/FBS Merger Agreement shall be in effect, and no
statute, rule, regulation, order, injunction or decree shall have been
enacted, entered, promulgated or enforced by any governmental entity which
prohibits, restricts or makes illegal the consummation of the FIB/FBS Merger.
 
(b) The obligation of FBS to effect the FIB/FBS Merger is also subject to the
satisfaction or waiver by FBS at or prior to the Effective Time of the
following conditions:
 
  (i) The representations and warranties of the Company set forth in the
FIB/FBS Merger Agreement shall be true and correct in all respects (or, in
certain enumerated cases, in all material respects) as of the date of the
FIB/FBS Merger Agreement and, except to the extent such representations and
warranties speak as of an earlier date, as of the Closing Date (as defined in
the FIB/FBS Merger Agreement), provided that such representations and
warranties shall be deemed to be true and correct in all respects unless the
failure or failures of such representations and warranties to be so true and
correct, individually or in the aggregate, would reasonably be expected to
result in a Material Adverse Effect on the Company and its subsidiaries taken
as a whole.
 
  (ii) The Company shall have performed in all material respects all of its
obligations under the FIB/FBS Merger Agreement at or prior to the Closing
Date.
 
  (iii) The Rights shall not have become nonredeemable, exercisable,
distributed or triggered pursuant to the terms of the Rights Agreement.
 
  (iv) FBS shall have received a letter from Ernst & Young LLP to the effect
that the FIB/FBS Merger will qualify for "pooling of interests" accounting
treatment.
 
                                      27
<PAGE>
 
  (v) FBS shall have received an opinion of Dorsey & Whitney P.L.L.P., in form
and substance reasonably satisfactory to FBS, that the FIB/FBS Merger will be
treated for Federal income tax purposes as a reorganization within the meaning
of Section 368(a) of the Code.
 
(c) The obligation of the Company to effect the FIB/FBS Merger is also subject
to the satisfaction or waiver by the Company at or prior to the Effective Time
of the following conditions:
 
  (i) The representations and warranties of FBS set forth in the FIB/FBS
Merger Agreement shall be true and correct in all respects (or, in certain
enumerated cases, in all material respects) as of the date of the FIB/FBS
Merger Agreement and, except to the extent such representations and warranties
speak as of an earlier date, as of the Closing Date, provided that such
representations and warranties shall be deemed to be true and correct in all
respects unless the failure or failures of such representations and warranties
to be so true and correct, individually or in the aggregate, would reasonably
be expected to result in a Material Adverse Effect on FBS and its subsidiaries
taken as a whole.
 
  (ii) FBS shall have performed in all material respects all of its
obligations under the FIB/FBS Merger Agreement at or prior to the Closing
Date.
 
  (iii) The FBS Rights shall not have become nonredeemable, exercisable,
distributed or triggered pursuant to the terms of the FBS Rights Agreement.
 
  (iv) The Company shall have received a letter from Ernst & Young LLP to the
effect that the FIB/FBS Merger will qualify for "pooling of interests"
accounting treatment.
 
  (v) The Company shall have received an opinion of Skadden, Arps, Slate,
Meagher & Flom, in form and substance reasonably satisfactory to the Company,
that the FIB/FBS Merger will be treated for Federal income tax purposes as a
reorganization within the meaning of Section 368(a) of the Code.
 
  Certain Covenants. The FIB/FBS Merger Agreement provides for certain
covenants pending the Effective Time. Generally, FBS and the Company shall,
and shall cause their respective subsidiaries to, (i) conduct their businesses
in the usual, regular and ordinary course consistent with past practices, (ii)
use their reasonable best efforts to maintain and preserve intact their
respective business organizations, employees and business relationships and
(iii) take no action which would reasonably be expected to adversely affect
the ability to obtain the regulatory approvals required to consummate the
transactions contemplated by the FIB/FBS Merger Agreement. The FIB/FBS Merger
Agreement also restricts, among other things, the ability of FBS and the
Company and their respective subsidiaries to (i) increase dividends or redeem,
repurchase or reclassify capital stock, (ii) dispose of or encumber assets,
(iii) make any material acquisitions (other than in the ordinary course of
business consistent with past practice or acquisitions of businesses having
assets not exceeding 10% of the consolidated assets on a pro forma basis of
FBS or the Company, as the case may be), (iv) increase employee compensation
(other than in the ordinary course of business consistent with past practice
or in an aggregate amount not exceeding $10 million), (v) settle any claim
that is material to FBS or the Company, as the case may be, (vi) take actions
that would prevent or impede qualification of the FIB/FBS Merger as a pooling
transaction or a reorganization under Section 368(a) of the Code, (vii) amend
their respective certificates of incorporation, bylaws and rights agreements
or (viii) change their respective investment securities portfolio policies.
FBS and the Company have also agreed not to, and cause their respective
subsidiaries not to, authorize or permit any of their officers, directors,
employees or agents to directly or indirectly solicit, initiate or encourage
any inquiries relating to, or the making of any proposal which constitutes, a
Takeover Proposal (as defined below), or recommend or endorse any Takeover
Proposal, or participate in any discussions or negotiations, or provide third
parties with any nonpublic information, relating to any such inquiry or
proposal or otherwise facilitate any effort or attempt to make or implement a
Takeover Proposal, unless (except in the case of the solicitation, initiation
or encouragement of inquiries relating to a Takeover Proposal) the Board of
Directors of FBS or the Company, as the case may be, after having consulted
with and considered the advice of outside counsel, has reasonably determined
in good faith that the failure to do so would cause the members of such Board
of Directors to breach
 
                                      28
<PAGE>
 
their fiduciary duties. Each of FBS and the Company shall immediately advise
the other following the receipt by it of any Takeover Proposal and the details
thereof, and advise the other of any developments with respect to such
Takeover Proposal, immediately upon the occurrence thereof. The term "Takeover
Proposal," as defined in the FIB/FBS Merger Agreement, means, with respect to
any person, any tender or exchange offer, proposal for a merger, consolidation
or other business combination involving FBS or the Company or any of their
respective subsidiaries or any proposal or offer to acquire in any manner a
substantial equity interest in, or a substantial portion of the assets of, FBS
or the Company or any of their respective subsidiaries. According to the First
Interstate 8-K, the Company considers the Offer to be a Takeover Proposal.
Each of the Company and FBS has also agreed to hold a meeting of its
shareholders for the purpose of obtaining the approvals of such shareholders
required in connection with the FIB/FBS Merger Agreement and to cause its
Board of Directors to recommend that its shareholders approve the matters to
be voted on by such shareholders in connection with the FIB/FBS Merger, except
that the Board of Directors of either party may fail to make such
recommendation (or withdraw, modify or change such recommendation in a manner
adverse to the other party) if such Board of Directors, after having consulted
with and considered the advice of outside counsel, reasonably determines in
good faith that the making of such recommendation (or the failure to so
withdraw, modify or change such recommendation) would constitute a breach of
the fiduciary duties of the members of such Board of Directors under
applicable law.
 
  Management; Board of Directors; Name. The FIB/FBS Merger Agreement provides
that at the Effective Time, Mr. Siart would become President and Chief
Operating Officer of the combined company and John F. Grundhofer, the current
Chairman, President and Chief Executive Officer of FBS, would become the
Chairman of the Board and Chief Executive Officer of the combined company. In
addition, at the Effective Time, FBS would change its name to First Interstate
Bancorp and increase the number of persons serving on its Board of Directors
to 20, ten of whom would be selected by the Company from among the members of
its Board of Directors immediately prior to the FIB/FBS Merger (the "First
Interstate Directors") and ten of whom would be selected by FBS from among the
members of its Board of Directors immediately prior to the FIB/FBS Merger (the
"FBS Directors"). During the three-year period following the Effective Time,
FBS, subject to the fiduciary duties of the directors, has agreed to take such
steps to assure that there will be an equal number of FBS Directors and First
Interstate Directors.
 
  Termination; Fees and Expenses. The FIB/FBS Merger Agreement may be
terminated at any time prior to the Effective Time:
 
   (a) by mutual consent of FBS and the Company in a written instrument, if
 the Board of Directors of each so determines;
 
   (b) by either the Board of Directors of FBS or the Board of Directors of
 the Company if (i) any governmental entity which must grant a requisite
 regulatory approval has denied approval of the FIB/FBS Merger and such denial
 has become final and nonappealable or (ii) any governmental entity of
 competent jurisdiction shall have issued a final nonappealable order
 enjoining or otherwise prohibiting the consummation of the transactions
 contemplated by the FIB/FBS Merger Agreement;
 
   (c) by either the Board of Directors of FBS or the Board of Directors of
 the Company if the FIB/FBS Merger shall not have been consummated on or
 before December 31, 1996 (or, if at such date the FIB/FBS Merger shall not
 have been consummated as a result of the existence of an order, injunction or
 decree issued by any court or agency of competent jurisdiction or other legal
 restraint or prohibition preventing the consummation of the FIB/FBS Merger or
 any of the other transactions contemplated by the FIB/FBS Merger Agreement,
 the earlier of (i) the date on which such legal restraint is no longer in
 effect and (ii) June 30, 1997), unless the failure of the Closing to occur by
 such date shall be due to the failure of the party seeking to terminate the
 FIB/FBS Merger Agreement to perform or observe the covenants and agreements
 of such party set forth therein;
 
   (d) by either the Board of Directors of FBS or the Board of Directors of
 the Company (provided that the terminating party is not then in material
 breach of any representation, warranty, covenant or other agreement
 
                                      29
<PAGE>
 
 contained in the FIB/FBS Merger Agreement) if the other party shall have
 breached (i) any of the covenants or agreements made by such other party
 therein or (ii) any of the representations or warranties made by such other
 party therein, and in either case, such breach (x) is not cured within thirty
 (30) days following written notice to the party committing such breach, or
 which breach, by its nature, cannot be cured prior to the Closing and (y)
 would entitle the non-breaching party not to consummate the transactions
 contemplated by the FIB/FBS Merger Agreement;
 
   (e) by either the Board of Directors of FBS or the Board of Directors of
 the Company if any approval of the stockholders of FBS or the Company
 contemplated by the FIB/FBS Merger Agreement shall not have been obtained by
 reason of the failure to obtain the required vote at a duly held meeting of
 stockholders or at any adjournment or postponement thereof;
 
   (f) prior to the approval of (x) the FIB/FBS Merger Agreement by the
 requisite vote of the Company's shareholders (if the Company is the
 terminating party) or (y) the transactions contemplated by the FIB/FBS Merger
 Agreement by FBS' shareholders (if FBS is the terminating party), by either
 the Board of Directors of FBS or the Board of Directors of the Company, if
 there exists at such time a Takeover Proposal for the party whose Board of
 Directors is seeking to terminate the FIB/FBS Merger Agreement pursuant to
 this paragraph (f) and such Board of Directors, after having consulted with
 and considered the advice of outside legal counsel, reasonably determines in
 good faith that such action is necessary in the exercise of its fiduciary
 duties under applicable laws; or
 
   (g) by either the Board of Directors of FBS or the Board of Directors of
 the Company, if the Board of Directors of the other party shall have
 withdrawn, modified or changed in a manner adverse to the terminating party
 its approval or recommendation of the FIB/FBS Merger Agreement (in the case
 of the Company) or the transactions contemplated thereby (in the case of
 FBS).
 
  As a further condition to the execution and delivery of the FIB/FBS Merger
Agreement, FBS and the Company executed the Reciprocal Fee Letters. Pursuant
to the Reciprocal Fee Letters, unless a Nullifying Event (as such term is
defined below) shall have occurred and be continuing at the time the FIB/FBS
Merger Agreement is terminated, in the event that the FIB/FBS Merger Agreement
is terminated pursuant to the foregoing provisions and prior to or
concurrently with such termination a First Trigger Event (as such term is
defined below) shall have occurred, the terminating party shall pay to the
other party a cash fee of $25 million. The terminating party shall pay an
additional cash fee of $75 million if prior to, concurrently with or within 18
months after such termination an Acquisition Event (as such term is defined
below) shall have occurred.
 
  A "First Trigger Event" shall mean the occurrence of any of the following
events:
 
   (i) either party's Board of Directors shall have failed to approve or
 recommend the FIB/FBS Merger Agreement or the transactions contemplated
 thereby, as the case may be, or shall have withdrawn or modified in a manner
 adverse to the other party its approval or recommendation of such
 transactions, or shall have resolved or publicly announced an intention to do
 either of the foregoing;
 
   (ii) either party or any Significant Subsidiary (as defined in Rule 1-02 of
 Regulation S-X promulgated by the Commission) thereof, or the Board of
 Directors of such party or a Significant Subsidiary, shall have recommended
 that the stockholders of such party approve any Acquisition Proposal (as such
 term is defined below) or shall have entered into an agreement with respect
 to, authorized, approved, proposed or publicly announced its intention to
 enter into, any Acquisition Proposal;
 
   (iii) the FIB/FBS Merger Agreement or the transactions contemplated
 thereby, as the case may be, shall not have been approved at a meeting of
 either party's stockholders which has been held for that purpose prior to
 termination of the FIB/FBS Merger Agreement in accordance with its terms, if
 prior thereto it shall have been publicly announced that any person (other
 than the other party or one of its subsidiaries) shall have made, or
 disclosed an intention to make, an Acquisition Proposal;
 
 
                                      30
<PAGE>
 
   (iv) any person or group (other than the other party or its subsidiaries)
 shall have acquired beneficial ownership or the right to acquire beneficial
 ownership of 50% or more of the then outstanding shares of the stock then
 entitled to vote generally in the election of directors of either FBS, the
 Company or any Significant Subsidiary thereof; or
 
   (v) following the making of an Acquisition Proposal, either party shall
 have breached any covenant or agreement contained in the FIB/FBS Merger
 Agreement such that the other party would be entitled to terminate the
 FIB/FBS Merger Agreement unless such breach is promptly cured without
 jeopardizing consummation of the FIB/FBS Merger pursuant to the terms of the
 FIB/FBS Merger Agreement.
 
  An "Acquisition Event" shall mean the consummation of any event described in
the definition of "Acquisition Proposal" below, except that the percentage
reference contained in clause (C) of such definition shall be 50% instead of
20%.
 
  An "Acquisition Proposal" shall mean any (i) publicly announced proposal,
(ii) regulatory application or notice (whether in draft or final form), (iii)
agreement or understanding, (iv) disclosure of an intention to make a
proposal, or (v) amendment to any of the foregoing, made or filed on or after
the date hereof, in each case with respect to any of the following
transactions with a third party: (A) a merger or consolidation, or any similar
transaction, involving either party or any Significant Subsidiary thereof
(other than mergers, consolidations or similar transactions involving solely
one of the parties and/or one or more wholly owned subsidiaries of the parties
and other than a merger or consolidation as to which the common shareholders
of one of the parties immediately prior thereto in the aggregate own at least
70% of the common stock of the publicly held surviving or successor
corporation (or any publicly held ultimate parent company thereof) immediately
following consummation thereof); (B) a purchase, lease or other acquisition of
all or substantially all of the assets or deposits of either FBS or the
Company, or any Significant Subsidiary thereof; or (C) a purchase or other
acquisition (including by way of merger, consolidation, share exchange or
otherwise) of securities representing 20% or more of the voting power of FBS
or the Company or any Significant Subsidiary thereof.
 
  A "Nullifying Event" shall mean any of the following events occurring and
continuing at a time when FBS or the Company, as the case may be, is not in
material breach of any of its covenants or agreements contained in the FIB/FBS
Merger Agreement: (i) the other party shall be in breach of any of its
covenants or agreements contained in the FIB/FBS Merger Agreement such that
FBS or the Company, as the case may be, shall be entitled to terminate the
FIB/FBS Merger Agreement, (ii) the stockholders of the other party shall have
voted and failed to approve the transactions contemplated by the FIB/FBS
Merger Agreement at a meeting of such stockholders which has been held for the
purpose or at any adjournment or postponement thereof (unless the FIB/FBS
Merger Agreement or the transactions contemplated thereby, as the case may be,
shall not have been approved at a meeting of the stockholders of the other
party which was held on or prior to such date for the purpose of voting with
respect to the FIB/FBS Merger Agreement) or (iii) the Board of Directors of
either FBS or the Company, as the case may be, shall have failed to approve or
recommend the FIB/FBS Merger Agreement or the transactions contemplated
thereby or shall have withdrawn, modified or changed in any manner adverse to
the other party its approval or recommendation of the transactions
contemplated by the FIB/FBS Merger Agreement or shall have resolved or
publicly announced its intention to do any of the foregoing.
 
  Except as provided in the Reciprocal Fee Letters and the Reciprocal Stock
Option Agreements referred to below, all costs and expenses incurred in
connection with the FIB/FBS Merger Agreement and the transactions contemplated
thereby shall be paid by the party incurring such expense, provided, however,
that (i) the costs and expenses of printing and mailing the joint proxy
statement, and all filing and other fees paid to the Commission in connection
with the FIB/FBS Merger, shall be borne equally by FBS and the Company and
(ii) notwithstanding anything to the contrary contained in the FIB/FBS Merger
Agreement, neither FBS nor the Company shall be relieved or released from any
liabilities or damages arising out of its willful breach of any provision of
the FIB/FBS Merger Agreement.
 
                                      31
<PAGE>
 
  Stock Option Agreements. As a further condition to the execution and
delivery of the FIB/FBS Merger Agreement, FBS and the Company entered into the
Reciprocal Stock Option Agreements. Pursuant to the Reciprocal Stock Option
Agreements, the Company granted FBS an unconditional, irrevocable option to
purchase up to 15,073,106 Shares (approximately 19.9% of the currently
outstanding Shares) at a price of $127.75 per Share (the closing price of the
Shares on the NYSE on November 3, 1995) and FBS granted the Company an
unconditional, irrevocable option to purchase up to 25,829,983 shares of FBS
Common Stock (approximately 19.9% of the currently outstanding shares) at a
price of $50.875 per share (the closing price of the FBS Common Stock on the
NYSE on November 3, 1995), in each case subject to certain adjustments and
limitations. Each option is exercisable, in whole or in part, only upon the
occurrence of certain events that create the potential for a third party to
acquire control of FBS or the Company. Such events include (i) the acquisition
by any person other than FBS or the Company, as the case may be, of beneficial
ownership of 20% or more of the outstanding Shares or FBS Common Stock, as the
case may be, and (ii) the agreement by FBS or the Company to enter into
certain acquisition transactions. Each option terminates upon the earlier of
(i) the Effective Time, (ii) the termination of the FIB/FBS Merger Agreement
in accordance with the provisions thereof if such termination occurs prior to
the occurrence of an Initial Triggering Event (as defined in the Reciprocal
Stock Option Agreements), which is similar to a First Triggering Event
(defined above), (iii) the passage of 18 months after termination of the
FIB/FBS Merger Agreement if such termination is concurrent with or follows an
Initial Triggering Event and (iv) the date on which there has been a failure
to obtain the requisite stockholder votes required pursuant to the FIB/FBS
Merger Agreement. The option may not be exercised at any time when the grantee
of the option is in breach of any of its covenants or agreements such that the
other party is entitled to terminate the FIB/FBS Merger Agreement.
Notwithstanding any other provisions of the Reciprocal Stock Option
Agreements, the Total Profit (as defined therein) which either FBS or the
Company may, as grantee of the option issued by the other party, respectively,
realize from the option may not exceed $100 million.
 
  Exercise of a Reciprocal Stock Option Agreement to acquire 5% or more of the
outstanding common stock of the issuer of the option would require, among
other things, receipt of the prior approval of the Federal Reserve Board under
Section 3 of the BHCA. The standards applicable to such an approval are
described generally under "The Offer--Regulatory Approval Condition" below.
 
  The foregoing descriptions of the FIB/FBS Merger Agreement, the Reciprocal
Fee Letters and the Reciprocal Stock Option Agreements are qualified in their
entirety by reference to the texts of such Agreements, copies of which have
been filed by the Company as exhibits to the First Interstate 8-K and are
incorporated by reference herein.
 
                                      32
<PAGE>
 
                                   THE OFFER
 
GENERAL
 
  The Purchaser hereby offers, upon the terms and subject to the conditions of
the Offer, to exchange two-thirds of a share of Wells Fargo Common Stock for
each outstanding Share validly tendered on or prior to the Expiration Date and
not withdrawn. The term "Expiration Date" shall mean 12:00 midnight, New York
City time, on     , 1996, unless and until the Purchaser extends the period of
time for which the Offer is open, in which event the term "Expiration Date"
shall mean the latest time and date at which the Offer, as so extended by the
Purchaser, shall expire.
 
  Tendering stockholders will not be obligated to pay any charges or expenses
of the Exchange Agent or any brokerage commissions. Except as set forth in the
Instructions to the Letter of Transmittal, transfer taxes on the exchange of
Shares pursuant to the Offer will be paid by or on behalf of the Purchaser.
 
  The purpose of the Offer is for the Purchaser to acquire control of, and
ultimately the entire common equity interest in, the Company. The Purchaser
intends, as soon as practicable after consummation of the Offer, to seek to
have the Company consummate the Merger with the Purchaser pursuant to which
each outstanding Share (except for treasury shares of the Company and Shares
held by the Purchaser or any subsidiary of the Purchaser other than in a
fiduciary capacity) would be converted into the right to receive two-thirds of
a share of Wells Fargo Common Stock. See "--Purpose of the Offer; the Merger."
 
  In the event that the Purchaser acquires all the Shares pursuant to the
Offer and/or the Merger, former stockholders of the Company would own
approximately 51.8% of the outstanding shares of Wells Fargo Common Stock,
based on the number of Shares outstanding on October 31, 1995. If 51% of the
Shares are exchanged, such ownership percentage would be approximately 35%.
 
  The Purchaser's obligation to exchange shares of Wells Fargo Common Stock
for Shares pursuant to the Offer is conditioned upon satisfaction of the
Minimum Tender Condition, the Wells Fargo Stockholder Approval Condition, the
Rights Plan and DGCL 203 Condition, the FIB/FBS Merger Agreement Condition and
the Regulatory Approval Condition (in each case as defined on the cover page
of this Prospectus) and the other conditions set forth under "--Certain Other
Conditions of the Offer." The conditions to the Offer are identical in all
material respects to a number of the conditions to the competing proposal to
effect the FIB/FBS Merger, although that competing proposal is also subject to
an additional condition which is not a condition to the Offer, namely that
each of the Company and FBS shall have received a letter from its accountants
to the effect that the FIB/FBS Merger will qualify for "pooling of interests"
accounting treatment. Based on discussions with its advisors, the Purchaser
believes there is a significant question as to whether the FIB/FBS Merger will
qualify for pooling of interests accounting treatment in light of the
increased share repurchase program FBS announced in connection with the
FIB/FBS Merger. See "--Rights Plan and DGCL 203 Condition," "--Regulatory
Approval Condition" and "--Certain Other Conditions of the Offer."
 
  Rights are presently evidenced by the certificates for the Shares and the
tender by a stockholder of his Shares prior to the Company Distribution Date
will also constitute a tender of the associated Rights. No separate payment
will be made by the Purchaser for the Rights pursuant to the Offer. Upon the
earlier to occur of (i) 10 days following a public announcement that a person
or group of affiliated persons (a "Company Acquiring Person") has acquired
beneficial ownership of 20% or more of the outstanding Shares or (ii) 10
business days (or such later date as may be determined by action of the
Company Board prior to such time as any person becomes a Company Acquiring
Person) following the commencement of, or announcement of an intention to
make, a tender offer or exchange offer the consummation of which would result
in the beneficial ownership by a person or group of 20% or more of such
outstanding Shares (the earlier of such dates being called the "Company
Distribution Date"), separate certificates evidencing the Rights will be
mailed to holders of record of the Shares as of the close of business on the
Company Distribution Date and such separate Rights certificates alone will
 
                                      33
<PAGE>
 
evidence the Rights. According to the Company Schedule 14D-9, the Company
Board determined to postpone the occurrence of the Company Distribution Date
as a result of the public announcement of the Offer until such later date as
determined by the Company Board.
 
  If the Company Distribution Date occurs and separate certificates
representing the Rights are distributed by the Company or the Rights Agent to
holders of Shares prior to the time a holder's Shares are tendered pursuant to
the Offer, certificates representing a number of Rights equal to the number of
Shares tendered must be delivered to the Exchange Agent, or, if available, a
book-entry confirmation received by the Exchange Agent with respect thereto,
in order for such Shares to be validly tendered. If the Company Distribution
Date occurs and separate certificates representing the Rights are not
distributed prior to the time Shares are tendered pursuant to the Offer,
Rights may be tendered prior to a stockholder receiving the certificates for
Rights by use of the guaranteed delivery procedure described under "--
Procedure for Tendering" below.
 
  According to the Company's Quarterly Report on Form 10-Q for the period
ended September 30, 1995, as of October 31, 1995, there were 75,744,254 Shares
outstanding. As of November 20, 1995, the Purchaser owned beneficially 100
Shares. Additionally, as of October 20, 1995, the Purchaser held 1,961,095
Shares (or approximately 2.6% of the outstanding Shares) in a fiduciary
capacity. The Purchaser disclaims beneficial ownership of the Shares owned in
such fiduciary capacity and any other Shares held by any pension plan of the
Purchaser or any affiliates of the Purchaser.
 
  Requests will be made to the Company for use of the Company's stockholder
list and security position listings for the purpose of communications with
stockholders and disseminating the Offer to holders of Shares. The Prospectus
and the related Letter of Transmittal and other relevant materials will be
mailed to record holders of Shares and will be furnished to brokers, dealers,
commercial banks, trust companies and similar persons whose names, or the
names of whose nominees, appear on the stockholder list or, if applicable, who
are listed as participants in a clearing agency's security position listing
for subsequent transmittal to beneficial owners of Shares by the Purchaser
following receipt of such list or listings from the Company.
 
EXTENSION, TERMINATION AND AMENDMENT
 
  The Purchaser expressly reserves the right, in its sole discretion, at any
time or from time to time, to extend the period of time during which the Offer
is to remain open by giving oral or written notice of such extension to the
Exchange Agent, which extension must be announced no later than 9:00 A.M., New
York City time, on the next business day after the previously scheduled
Expiration Date. There can be no assurance that the Purchaser will exercise
its right to extend the Offer. However, it is the Purchaser's current
intention to extend the Offer until all conditions have been satisfied or
waived. See "--Extension, Termination and Amendment." During any such
extension, all Shares previously tendered and not withdrawn will remain
subject to the Offer, subject to the right of a tendering stockholder to
withdraw his Shares. See "--Withdrawal Rights."
 
  Subject to the applicable rules and regulations of the Commission, the
Purchaser also reserves the right, in its sole discretion, at any time or from
time to time, (i) to delay acceptance for exchange of or, regardless of
whether such Shares were theretofore accepted for exchange, exchange of any
Shares pursuant to the Offer or to terminate the Offer and not accept for
exchange or exchange any Shares not therefore accepted for exchange, or
exchanged, upon the failure of any of the conditions of the Offer to be
satisfied and (ii) to waive any condition other than the Regulatory Approval
Condition or otherwise amend the Offer in any respect, by giving oral or
written notice of such delay, termination or amendment to the Exchange Agent
and by making a public announcement thereof. Any such extension, termination,
amendment or delay will be followed as promptly as practicable by public
announcement thereof, such announcement in the case of an extension to be
issued no later than 9:00 A.M., New York City time, on the next business day
after the previously scheduled Expiration Date. Subject to applicable law
(including Rules 14d-4(c) and 14d-6(d) under the Exchange Act, which requires
that any material change in the information published, sent or given to
stockholders in connection with the Offer be promptly disseminated to
stockholders in a manner reasonably designed to inform stockholders of such
change)
 
                                      34
<PAGE>
 
and without limiting the manner in which the Purchaser may choose to make any
public announcement, the Purchaser shall have no obligation to publish,
advertise or otherwise communicate any such public announcement other than by
making a release to the Dow Jones News Service.
 
  The Purchaser confirms that if it makes a material change in the terms of
the Offer or the information concerning the Offer, or if it waives a material
condition of the Offer, the Purchaser will extend the Offer to the extent
required under the Exchange Act. If, prior to the Expiration Date, the
Purchaser shall increase or decrease the percentage of Shares being sought or
the consideration offered to holders of Shares, such increase or decrease
shall be applicable to all holders whose Shares are accepted for exchange
pursuant to the Offer, and, if at the time notice of any such increase or
decrease is first published, sent or given to holders of Shares, the Offer is
scheduled to expire at any time earlier than the tenth business day from and
including the date that such notice is first so published, sent or given, the
Offer will be extended until the expiration of such ten business-day period.
For purposes of the Offer, a "business day" means any day other than a
Saturday, Sunday or federal holiday and consists of the time period from 12:01
A.M. through 12:00 midnight, New York City time.
 
EXCHANGE OF SHARES; DELIVERY OF WELLS FARGO COMMON STOCK
 
  Upon the terms and subject to the conditions of the Offer (including, if the
Offer is extended or amended, the terms and conditions of any such extension
or amendment), the Purchaser will accept for exchange, and will exchange,
Shares validly tendered and not withdrawn as promptly as practicable after the
Expiration Date. In addition, subject to applicable rules of the Commission,
the Purchaser expressly reserves the right to delay acceptance for exchange or
the exchange of Shares in order to comply with any applicable law. In all
cases, exchange of Shares tendered and accepted for exchange pursuant to the
Offer will be made only after timely receipt by the Exchange Agent of
certificates for such Shares (or a confirmation of a book-entry transfer of
such Shares in the Exchange Agent's account at The Depository Trust Company,
the Midwest Securities Trust Company, or the Philadelphia Depository Trust
Company (collectively, the "Book-Entry Transfer Facilities")), a properly
completed and duly executed Letter of Transmittal (or facsimile thereof) and
any other required documents.
 
  For purposes of the Offer, the Purchaser will be deemed to have accepted for
exchange Shares validly tendered and not withdrawn as, if and when the
Purchaser gives oral or written notice to the Exchange Agent of its acceptance
of the tenders of such Shares pursuant to the Offer. Delivery of Wells Fargo
Common Stock in exchange for Shares pursuant to the Offer and cash in lieu of
fractional shares of Wells Fargo Common Stock will be made by the Exchange
Agent as soon as practicable after receipt of such notice. The Exchange Agent
will act as agent for tendering stockholders for the purpose of receiving
Wells Fargo Common Stock and cash to be paid in lieu of fractional shares of
Wells Fargo Common Stock from the Purchaser and transmitting such Wells Fargo
Common Stock and cash to tendering stockholders. Under no circumstances will
interest with respect to fractional shares be paid by the Purchaser by reason
of any delay in making such exchange.
 
  If any tendered Shares are not accepted for exchange pursuant to the terms
and conditions of the Offer for any reason, or if certificates are submitted
for more Shares than are tendered, certificates for such unexchanged Shares
will be returned without expense to the tendering stockholder or, in the case
of Shares tendered by book-entry transfer of such Shares into the Exchange
Agent's account at a Book-Entry Transfer Facility pursuant to the procedures
set forth below under "--Procedure for Tendering," such Shares will be
credited to an account maintained within such Book-Entry Transfer Facility, as
soon as practicable following expiration or termination of the Offer.
 
CASH IN LIEU OF FRACTIONAL SHARES OF WELLS FARGO COMMON STOCK
 
  No certificates representing fractional shares of Wells Fargo Common Stock
will be issued pursuant to the Offer. In lieu thereof, each tendering
stockholder who would otherwise be entitled to a fractional share of Wells
Fargo Common Stock will receive cash in an amount equal to such fraction
(expressed as a decimal and rounded
 
                                      35
<PAGE>
 
to the nearest 0.01 of a share) times the closing price for shares of Wells
Fargo Common Stock on the NYSE Composite Tape on the date such stockholder's
Shares are accepted for exchange by the Purchaser.
 
WITHDRAWAL RIGHTS
 
  Tenders of Shares made pursuant to the Offer are irrevocable, except that
Shares tendered pursuant to the Offer may be withdrawn at any time prior to
the Expiration Date, and, unless theretofore accepted for exchange by the
Purchaser pursuant to the Offer, may also be withdrawn at any time after     ,
1996.
 
  For a withdrawal to be effective, a written, telegraphic, telex or facsimile
transmission notice of withdrawal must be timely received by the Exchange
Agent at one of its addresses set forth on the back cover of this Prospectus
and must specify the name of the person having tendered the Shares to be
withdrawn, the number of Shares to be withdrawn and the name of the registered
holder, if different from that of the person who tendered such Shares.
 
  The signature(s) on the notice of withdrawal must be guaranteed by a
financial institution (including most banks, savings and loan associations and
brokerage houses) which is a participant in the Securities Transfer Agents
Medallion Program, the New York Stock Exchange Medallion Signature Program or
the Stock Exchange Medallion Program (an "Eligible Institution") unless such
Shares have been tendered for the account of any Eligible Institution. If
Shares have been tendered pursuant to the procedures for book-entry tender as
set forth below under "Procedure for Tendering," any notice of withdrawal must
specify the name and number of the account at the Book-Entry Transfer Facility
to be credited with the withdrawn Shares and must otherwise comply with such
Book-Entry Transfer Facility's procedures. If certificates have been delivered
or otherwise identified to the Exchange Agent, the name of the registered
holder and the serial numbers of the particular certificates evidencing the
Shares withdrawn must also be furnished to the Exchange Agent as aforesaid
prior to the physical release of such certificates. All questions as to the
form and validity (including time of receipt) of any notice of withdrawal will
be determined by the Purchaser, in its sole discretion, which determination
shall be final and binding. Neither the Purchaser, the Exchange Agent, the
Information Agent, the Dealer Manager[s] nor any other person will be under
any duty to give notification of any defects or irregularities in any notice
of withdrawal or will incur any liability for failure to give any such
notification. Any Shares properly withdrawn will be deemed not to have been
validly tendered for purposes of the Offer. However, withdrawn Shares may be
retendered by following one of the procedures described under "--Procedure for
Tendering" at any time prior to the Expiration Date.
 
  A withdrawal of Shares shall also constitute a withdrawal of the associated
Rights. Rights may not be withdrawn unless the associated Shares are also
withdrawn.
 
PROCEDURE FOR TENDERING
 
  For a stockholder to validly tender Shares pursuant to the Offer, (i) a
properly completed and duly executed Letter of Transmittal (or manually
executed facsimile thereof), together with any required signature guarantees
and any other required documents, must be transmitted to and received by the
Exchange Agent at one of its addresses set forth on the back cover of this
Prospectus and certificates for tendered Shares must be received by the
Exchange Agent at such address or such Shares must be tendered pursuant to the
procedures for book-entry tender set forth below (and a confirmation of
receipt of such tender received (such confirmation, a "Book-Entry
Confirmation")), in each case prior to the Expiration Date, or (ii) such
stockholder must comply with the guaranteed delivery procedure set forth
below.
 
  Stockholders will be required to tender one Right for each Share tendered in
order to effect a valid tender of shares, unless the Rights Plan and DGCL 203
Condition (insofar as it relates to the Rights) has been satisfied or waived.
Unless the Company Distribution Date occurs, a tender of Shares will
constitute a tender of the associated Rights. If the Company Distribution Date
occurs and separate certificates representing the Rights are distributed by
the Company or the Rights Agent to holders of Shares prior to the time a
holder's Shares are
 
                                      36
<PAGE>
 
tendered pursuant to the Offer, certificates representing a number of Rights
equal to the number of Shares tendered must be delivered to the Exchange
Agent, or, if available, a Book-Entry Confirmation received by the Exchange
Agent with respect thereto, in order for such Shares to be validly tendered.
If the Company Distribution Date occurs and separate certificates representing
the Rights are not distributed prior to the time Shares are tendered pursuant
to the Offer, Rights may be tendered prior to a stockholder receiving the
certificates for Rights by use of the guaranteed delivery procedure described
below. If Rights certificates are distributed but are not available to a
stockholder prior to the time Shares are tendered pursuant to the Offer, a
tender of Shares constitutes an agreement by the tendering stockholder to
deliver to the Exchange Agent pursuant to the guaranteed delivery procedure
described below, prior to the expiration of the period to be specified in the
Notice of Guaranteed Delivery and the related Letter of Transmittal for
delivery of Rights certificates or a Book-Entry Confirmation for Rights (the
"Rights Delivery Period"), Rights certificates representing a number of Rights
equal to the number of Shares tendered. If Rights certificates are
distributed, the Purchaser will distribute a separate letter of transmittal
for such Rights certificates. If Rights certificates are tendered separately
from Shares, then a properly completed letter of transmittal for Rights
certificates (or manually executed facsimile thereof) must be submitted with
respect to such Rights. The Purchaser reserves the right to require that it
receive such Rights certificates (or a Book-Entry Confirmation with respect to
such Rights) prior to accepting Shares for exchange.
 
  Nevertheless, the Purchaser will be entitled to accept for exchange Shares
tendered by a stockholder prior to receipt of the Rights certificates required
to be tendered with such Shares or a Book-Entry Confirmation with respect to
such Rights and either (i) subject to complying with applicable rules and
regulations of the Commission, withhold payment for such Shares pending
receipt of the Rights certificates or a Book-Entry Confirmation for such
Rights or (ii) exchange Shares accepted for exchange pending receipt of the
Rights certificates or a Book-Entry Confirmation for such Rights in reliance
upon the guaranteed delivery procedure described below. In addition, after
expiration of the Rights Delivery Period, the Purchaser may instead elect to
reject as invalid a tender of Shares with respect to which Rights certificates
or a Book-Entry Confirmation for an equal number of Rights have not been
received by the Exchange Agent. Any determination by the Purchaser to make
payment for Shares in reliance upon such guaranteed delivery procedure or,
after expiration of the Rights Delivery Period, to reject a tender as invalid,
shall be made, subject to applicable law, in the sole and absolute discretion
of the Purchaser.
 
  The Exchange Agent will establish accounts with respect to the Shares at the
Book-Entry Transfer Facilities for purposes of the Offer within two business
days after the date of this Prospectus, and any financial institution that is
a participant in any of the Book-Entry Transfer Facilities' systems may make
book-entry delivery of the Shares by causing such Book-Entry Transfer Facility
to transfer such Shares into the Exchange Agent's account in accordance with
such Book-Entry Transfer Facility's procedure for such transfer. However,
although delivery of Shares may be effected through book-entry at the Book-
Entry Transfer Facilities, the Letter of Transmittal (or facsimile thereof),
with any required signature guarantees and any other required documents, must,
in any case, be transmitted to and received by the Exchange Agent at one or
more of its addresses set forth on the back cover of this Prospectus prior to
the Expiration Date, or the guaranteed delivery procedure described below must
be complied with. No assurance can be given, however, that book-entry delivery
of Rights will be available. If book-entry delivery is not available, a
tendering stockholder will be required to tender Rights by means of delivery
of Rights certificates or pursuant to the guaranteed delivery procedure set
forth below.
 
  Signatures on all Letters of Transmittal must be guaranteed by an Eligible
Institution, except in cases in which Shares are tendered (i) by a registered
holder of Shares who has not completed either the box entitled "Special
Payment Instructions" or the box entitled "Special Delivery Instructions" on
the Letter of Transmittal or (ii) for the account of an Eligible Institution.
If the certificates for Shares or Rights (if any) are registered in the name
of a person other than the signer of the Letter of Transmittal, or if
certificates for unexchanged Shares or Rights (if any) are to be issued to a
person other than the registered holder(s), the certificates must be endorsed
or accompanied by appropriate stock powers, in either case signed exactly as
the name or names of the registered owner or owners appear on the
certificates, with the signature(s) on the certificates or stock powers
guaranteed as aforesaid.
 
                                      37
<PAGE>
 
  THE METHOD OF DELIVERY OF SHARE CERTIFICATES AND ALL OTHER REQUIRED
DOCUMENTS, INCLUDING DELIVERY THROUGH ANY BOOK-ENTRY TRANSFER FACILITY, IS AT
THE OPTION AND RISK OF THE TENDERING STOCKHOLDER, AND THE DELIVERY WILL BE
DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE EXCHANGE AGENT. IF DELIVERY IS
BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED, IS
RECOMMENDED. IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE TIMELY
DELIVERY.
 
  TO PREVENT BACKUP FEDERAL INCOME TAX WITHHOLDING WITH RESPECT TO CASH
RECEIVED IN LIEU OF FRACTIONAL SHARES THEREOF, A STOCKHOLDER MUST PROVIDE THE
EXCHANGE AGENT WITH HIS CORRECT TAXPAYER IDENTIFICATION NUMBER AND CERTIFY
WHETHER SUCH STOCKHOLDER IS SUBJECT TO BACKUP WITHHOLDING OF FEDERAL INCOME
TAX BY COMPLETING THE SUBSTITUTE FORM W-9 INCLUDED IN THE LETTER OF
TRANSMITTAL. CERTAIN STOCKHOLDERS (INCLUDING, AMONG OTHERS, ALL CORPORATIONS
AND CERTAIN FOREIGN INDIVIDUALS) ARE NOT SUBJECT TO THESE BACKUP WITHHOLDING
AND REPORTING REQUIREMENTS. IN ORDER FOR A FOREIGN INDIVIDUAL TO QUALIFY AS AN
EXEMPT RECIPIENT, THE STOCKHOLDER MUST SUBMIT A FORM W-8, SIGNED UNDER
PENALTIES OF PERJURY, ATTESTING TO THAT INDIVIDUAL'S EXEMPT STATUS.
 
  If a stockholder desires to tender Shares pursuant to the Offer and such
stockholder's certificates are not immediately available or such stockholder
cannot deliver the certificates and all other required documents to the
Exchange Agent prior to the Expiration Date or such stockholder cannot
complete the procedure for book-entry transfer on a timely basis, such Shares
may nevertheless be tendered, provided that all of the following conditions
are satisfied:
 
   (a) such tenders are made by or through an Eligible Institution;
 
   (b) a properly completed and duly executed Notice of Guaranteed Delivery,
 substantially in the form made available by the Purchaser, is received by the
 Exchange Agent as provided below on or prior to the Expiration Date; and
 
   (c) the certificates for all tendered Shares (or a confirmation of a book-
 entry transfer of such securities into the Exchange Agent's account at a
 Book-Entry Transfer Facility as described above), in proper form for
 transfer, together with a properly completed and duly executed Letter of
 Transmittal (or facsimile thereof) and all other documents required by the
 Letter of Transmittal are received by the Exchange Agent within three NYSE
 trading days after the date of execution of such Notice of Guaranteed
 Delivery.
 
  The Notice of Guaranteed Delivery may be delivered by hand or transmitted by
telegram, telex, facsimile transmission or mail to the Exchange Agent and must
include a guarantee by an Eligible Institution in the form set forth in such
Notice.
 
  In all cases, exchanges of Shares tendered and accepted for exchange
pursuant to the Offer will be made only after timely receipt by the Exchange
Agent of certificates for Shares (or timely confirmation of a book-entry
transfer of such securities into the Exchange Agent's account at a Book-Entry
Transfer Facility as described above), properly completed and duly executed
Letter(s) of Transmittal (or facsimile(s) thereof) and any other required
documents. Accordingly, tendering stockholders may be paid at different times
depending upon when certificates for Shares or confirmations of book-entry
transfers of such Shares are actually received by the Exchange Agent.
 
  By executing a Letter of Transmittal as set forth above, the tendering
stockholder irrevocably appoints designees of the Purchaser as such
stockholder's attorneys-in-fact and proxies, each with full power of
substitution, to the full extent of such stockholder's rights with respect to
the Shares tendered by such stockholder and accepted for exchange by the
Purchaser and with respect to any and all other Shares and other securities
 
                                      38
<PAGE>
 
issued or issuable in respect of the Shares on or after     , 199 . Such
appointment is effective, and voting rights will be affected, when and only to
the extent that the Purchaser deposits the shares of Wells Fargo Common Stock
for Shares tendered by such stockholder with the Exchange Agent. All such
proxies shall be considered coupled with an interest in the tendered Shares
and therefore shall not be revocable. Upon the effectiveness of such
appointment, all prior proxies given by such stockholder will be revoked, and
no subsequent proxies may be given (and, if given, will not be deemed
effective). The Purchaser's designees will, with respect to the Shares for
which the appointment is effective, be empowered, among other things, to
exercise all voting and other rights of such stockholder as they, in their
sole discretion, deem proper at any annual, special or adjourned meeting of
the Company's stockholders, by written consent in lieu of any such meeting or
otherwise. The Purchaser reserves the right to require that, in order for
Shares to be deemed validly tendered, immediately upon the Purchaser's
exchange of such Shares, the Purchaser must be able to exercise full voting
rights with respect to such Shares.
 
  All questions as to the validity, form, eligibility (including time of
receipt) and acceptance for exchange of any tender of Shares will be
determined by the Purchaser, in its sole discretion, which determination shall
be final and binding. The Purchaser reserves the absolute right to reject any
and all tenders of Shares determined by it not to be in proper form or the
acceptance of or exchange for which may, in the opinion of Purchaser's
counsel, be unlawful. The Purchaser also reserves the absolute right to waive
any of the conditions of the Offer, other than the Regulatory Approval
Condition, or any defect or irregularity in the tender of any Shares. No
tender of Shares will be deemed to have been validly made until all defects
and irregularities in tenders of Shares have been cured or waived. Neither the
Purchaser, the Exchange Agent, the Information Agent, the Dealer Manager[s]
nor any other person will be under any duty to give notification of any
defects or irregularities in the tender of any Shares or will incur any
liability for failure to give any such notification. The Purchaser's
interpretation of the terms and conditions of the Offer (including the Letter
of Transmittal and instructions thereto) will be final and binding.
 
  The tender of Shares and Rights (if any) pursuant to any of the procedures
described above will constitute a binding agreement between the tendering
stockholder and the Purchaser upon the terms and subject to the conditions of
the Offer.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
  In the opinion of Sullivan & Cromwell, counsel to the Purchaser, exchanges
of Shares for Wells Fargo Common Stock pursuant to the Offer and the Merger
should be treated for federal income tax purposes as exchanges pursuant to a
plan of reorganization within the meaning of the Code. Consequently, no gain
or loss should be recognized by holders of Shares upon such exchanges, except
as described below under "Tax Consequences to Holders of Shares if the Offer
and the Merger Qualify as a Reorganization." This opinion is based on Sullivan
& Cromwell's view that the Offer and the Merger should be treated as a single
transaction and on certain assumptions, including that (a) the continuity of
shareholder interest requirement applicable to corporate reorganizations
(which requires a continuing equity interest in the Purchaser by holders
owning a significant percentage of the Shares prior to the consummation of the
Offer) will be satisfied, taking into account any holders that exercise
dissenters' rights, if any, (b) the Purchaser will continue the Company's
historic business or will use a significant portion of the Company's historic
business assets in a business and (c) the Offer and the Merger will generally
be consummated as contemplated by this Prospectus.
 
  In rendering their opinion, Sullivan & Cromwell have further assumed that
(a) upon consummation of the Offer, there will be no significant contingencies
preventing the prompt consummation of the Merger, (b) upon consummation of the
Offer, the Purchaser will not have waived any of the conditions relating to
its obligation to consummate the Offer in a manner that could prevent a prompt
consummation of the Merger and (c) the Merger will in fact be consummated
promptly after the consummation of the Offer. A significant delay in the
consummation of the Merger would substantially increase the risk that the
Offer will not qualify as part of a reorganization within the meaning of
Section 368(a)(1)(A) of the Code and the absence of the Merger would
 
                                      39
<PAGE>
 
mean that the Offer was not part of a reorganization. The consequences of a
failure to so qualify are discussed below under "Tax Consequences to Holders
of Shares if the Offer Does Not Qualify as Part of a Reorganization."
 
  In deciding whether two steps are part of a single transaction qualifying as
a reorganization, some courts have applied the so-called "binding commitment"
test. Under that test, two steps will be integrated only if, at the time that
the first step is consummated, there is a binding commitment to consummate the
second step. If the "binding commitment" test were applied to the Offer and
the Merger and the Company has not at the time the Offer is consummated
entered into an agreement with the Purchaser requiring the Purchaser to effect
the Merger, the Offer and the Merger would not be treated as a single
transaction, and the Offer would not qualify as part of a reorganization.
Although the matter is not free from doubt, Sullivan & Cromwell do not believe
that the "binding commitment" test should be applied to determine whether the
Offer and the Merger should be treated as a single transaction.
 
  Assuming that the Merger qualifies as a reorganization under the Code, no
gain or loss will be recognized by the Purchaser or the Company as a result of
the Offer and the Merger.
 
  This summary does not address any tax consequences of the Offer or the
Merger to U.S Holders who exercise dissenters' rights, if any. It may not
apply to certain classes of taxpayers, including, without limitation,
insurance companies, tax-exempt organizations, financial institutions, dealers
in securities, foreign persons, persons who acquired Shares pursuant to an
exercise of employee stock options or rights or otherwise as compensation and
persons who hold Shares as part of a straddle or conversion transaction. Also,
the summary does not address state, local or foreign tax consequences of the
Offer or the Merger. Consequently, each holder should consult such holder's
own tax advisor as to the specific tax consequences of the Offer and the
Merger to such holder.
 
  This summary is based on current law and the opinion of Sullivan & Cromwell.
Future legislative, judicial or administrative changes or interpretations,
which may be retroactive, could alter or modify the statements set forth
herein. The opinion of Sullivan & Cromwell set forth in this summary is based,
among other things, on assumptions relating to certain facts and circumstances
of, and the intentions of the parties to, the Offer and the Merger, which
assumptions have been made with the consent of the Purchaser. The Purchaser
will not request any ruling from the Internal Revenue Service as to the United
States federal income tax consequences of the Offer and the Merger. An opinion
of counsel is not binding on the Internal Revenue Service, and the Internal
Revenue Service is not precluded from taking contrary positions.
 
 Tax Consequences to Holders of Shares if the Offer and the Merger Qualify as
a Reorganization
 
  If the Offer and the Merger together qualify as a reorganization within the
meaning of Section 368(a)(1)(A) of the Code, the material federal income tax
consequences to holders who are (a) citizens or residents of the United
States, (b) domestic corporations or (c) otherwise subject to United States
federal income tax on a net income basis in respect of the Shares ("U.S.
Holders") who hold Shares as capital assets and who exchange such Shares
pursuant to the Offer or the Merger, or both, will be as follows:
 
   (i) no gain or loss will be recognized by a U.S. Holder on the exchange of
 Shares for Wells Fargo Common Stock, except as described below with respect
 to the receipt of cash in lieu of fractional shares of Wells Fargo Common
 Stock, and subject to the discussion below of the surrender of Rights that
 have become exercisable;
 
   (ii) the aggregate adjusted tax basis of shares of Wells Fargo Common Stock
 received by a U.S. Holder (including fractional shares of Well Fargo Common
 Stock deemed received and redeemed as described below) will be the same as
 the aggregate adjusted tax basis of the Shares exchanged therefor;
 
                                      40
<PAGE>
 
   (iii) the holding period of shares of Wells Fargo Common Stock (including
 the holding period of fractional shares of Wells Fargo Common Stock) received
 by a U.S. Holder will include the holding period of the Shares exchanged
 therefor; and
 
   (iv) a U.S. Holder of Shares who receives cash in lieu of fractional shares
 of Wells Fargo Common Stock will be treated as having received such
 fractional shares and then as having received such cash in redemption of such
 fractional shares. Under Section 302 of the Code, provided that such deemed
 distribution is "substantially disproportionate" with respect to such U.S
 Holder or is "not essentially equivalent to a dividend" after giving effect
 to the constructive ownership rules of the Code, the U.S. Holder will
 generally recognize capital gain or loss equal to the difference between the
 amount of cash received and the U.S. Holder's adjusted tax basis in the
 fractional share interest in Wells Fargo Common Stock. Such capital gain or
 loss will be long-term capital gain or loss if the U.S. Holder's holding
 period in the fractional shares is more than one year.
 
  Sullivan & Cromwell express no opinion as to the federal income tax
consequences of the surrender pursuant to the Offer or the Merger of Rights
that have become exercisable.
 
 Tax Consequences to Holders of Shares if the Offer Does Not Qualify as Part
of a Reorganization
 
  If the Merger is not consummated, or if the Merger is consummated but the
Offer is treated as a separate transaction for federal income tax purposes,
exchanges pursuant to the Offer will be taxable transactions for federal
income tax purposes. In that case, each U.S. Holder exchanging Shares for
shares of Wells Fargo Common Stock pursuant to the Offer will recognize gain
or loss for federal income tax purposes measured by the difference between
such U.S. Holder's adjusted basis in the Shares exchanged and the sum of the
fair market value of Wells Fargo Common Stock received by such U.S. Holder
pursuant to the Offer and any cash received by such U.S. Holder in lieu of
fractional shares of Wells Fargo Common Stock.
 
  If the Offer is a taxable transaction, the Merger itself should be
considered a reorganization within the meaning of Section 368(a)(1)(A) of the
Code if the continuity of interest requirement is satisfied in the Merger. For
advanced ruling purposes, guidelines published by the Internal Revenue Service
would require that stockholders of the Company receive in the Merger stock of
the Purchaser having a value equal to at least 50% of the value of all of the
stock of the Company outstanding prior to the Merger. In that event, a U.S.
Holder receiving Wells Fargo Common Stock in the Merger would be subject to
the rules concerning reorganizations described above with respect to such
Wells Fargo Common Stock, but not with respect to any Wells Fargo Common Stock
received by such U.S. Holder pursuant to the Offer.
 
EFFECT OF OFFER ON MARKET FOR SHARES; REGISTRATION UNDER THE EXCHANGE ACT
 
  The exchange of Shares pursuant to the Offer will reduce the number of
holders of Shares and the number of Shares that might otherwise trade publicly
and could adversely affect the liquidity and market value of the remaining
Shares held by the public.
 
  The Shares are listed and principally traded on the NYSE and are also listed
on the Boston Stock Exchange, Cincinnati Stock Exchange, Midwest Stock
Exchange, Philadelphia-Baltimore-Washington Stock Exchange and the PSE.
Depending upon the number of Shares acquired pursuant to the Offer, the Shares
may no longer meet the requirements of such exchanges for continued listing.
For example, published guidelines of the NYSE indicate that the NYSE would
consider delisting the outstanding Shares if, among other things, (i) the
number of publicly held Shares (exclusive of holdings of officers, directors
and members of their immediate families and other concentrated holdings of 10
percent or more) should fall below 600,000, (ii) the number of record holders
of 100 or more Shares should fall below 1,200 or (iii) the aggregate market
value of publicly held Shares should fall below $5 million.
 
  According to the Company's Quarterly Report on Form 10-Q for the period
ended September 30, 1995, there were, as of October 31, 1995, 75,744,254
Shares outstanding, and according to the 1994 Company 10-K, there were, as of
February 28, 1995, 24,976 holders of record of Shares.
 
                                      41
<PAGE>
 
  If such exchanges were to delist the Shares, the market therefor could be
adversely affected. It is possible that the Shares would be traded on other
securities exchanges or in the over-the-counter market, and that price
quotations would be reported by such exchanges, or through Nasdaq or by other
sources. The extent of the public market for the Shares and the availability
of such quotations would, however, depend upon the number of holders and/or
the aggregate market value of the Shares remaining at such time, the interest
in maintaining a market in the Shares on the part of securities firms, the
possible termination of registration Shares under the Exchange Act, as
described below, and other factors.
 
  The Shares are presently "margin securities" under the regulations of the
Federal Reserve Board, which has the effect, among other things, of allowing
brokers to extend credit on the collateral of such Shares. Depending on
factors similar to those described above with respect to listing and market
quotations, the Shares may no longer constitute "margin securities" for the
purposes of the Federal Reserve Board's margin regulations in which event the
Shares would be ineligible as collateral for margin loans made by brokers.
 
  The Shares are currently registered under the Exchange Act. Such
registration may be terminated by the Company upon application to the
Commission if the outstanding Shares are not listed on a national securities
exchange and if there are fewer than 300 holders of record of Shares.
Termination of registration of the Shares under the Exchange Act would reduce
the information required to be furnished by the Company to its stockholders
and to the Commission and would make certain provisions of the Exchange Act,
such as the short-swing profit recovery provisions of Section 16(b) and the
requirement of furnishing a proxy statement in connection with stockholders'
meetings pursuant to Section 14(a) and the related requirement of furnishing
an annual report to stockholders, no longer applicable with respect to the
Shares. Furthermore, the ability of "affiliates" of the Company and persons
holding "restricted securities" of the Company to dispose of such securities
pursuant to Rule 144 under the Securities Act, may be impaired or eliminated.
If registration of the Shares under the Exchange Act were terminated, the
Shares would no longer be eligible for Nasdaq reporting or for continued
inclusion on the Federal Reserve Board's list of "margin securities."
 
  The Rights currently are registered under the Exchange Act and are listed on
the NYSE and the PSE, but currently are attached to the outstanding Shares and
are not separately transferable. The Rights may become transferable apart from
the Shares, unless previously redeemed. If the Rights are not redeemed or
invalidated and the Purchaser waives the Rights Plan and DGCL 203 Condition,
then the foregoing discussion with respect to the effect of the Offer on the
Shares would be similarly applicable to the Rights (although the continued
listing criteria are different).
 
PURPOSE OF THE OFFER; THE MERGER
 
  The purpose of the Offer is to enable the Purchaser to acquire control of,
and the entire common equity interest in, the Company. The Offer, as the first
step in the acquisition of the Company, is intended to facilitate the
acquisition of all Shares. The Purchaser intends, as soon as practicable after
consummation of the Offer, to seek to have the Company consummate the Merger
with the Purchaser. Assuming the Minimum Tender Condition is satisfied, the
Purchaser would have sufficient voting power to effect the Merger without the
vote of any other stockholder of the Company. The purpose of the Merger is to
acquire all Shares not tendered and purchased pursuant to the Offer or
otherwise. Pursuant to the Merger, each then outstanding Share (except for
Shares owned by the Purchaser or any subsidiary of the Purchaser other than in
a fiduciary capacity) would be converted into the right to receive two-thirds
of a share of Wells Fargo Common Stock.
 
  Holders of Shares do not have appraisal rights as a result of the Offer and,
assuming the Shares remain listed on a national securities exchange or Nasdaq
or a similar market, will not have appraisal rights as a result of the Merger.
However, in the event the Merger is consummated, and if, on the date fixed to
determine stockholders entitled to vote on the Merger, the Shares are no
longer listed on a national securities exchange or Nasdaq or a similar market,
holders of Shares will have certain rights pursuant to the provisions of
Section 262 of the DGCL to dissent and to demand appraisal of their Shares.
Under Section 262, dissenting stockholders
who comply with the applicable statutory procedures will be entitled to
receive a judicial determination of the
 
                                      42
<PAGE>
 
fair value of their Shares (exclusive of any element of value arising from the
accomplishment or expectation of the Merger) and to receive payment of such
fair value in cash, together with a fair rate of interest, if any. Any such
judicial determination of the fair value of Shares could be based upon factors
other than, or in addition to, the price per Share to be paid in the Merger or
the market value of the Shares. The value so determined could be more or less
than the price per Share to be paid in the Merger.
 
  Rule 13e-3 of the General Rules and Regulations under the Exchange Act,
which the Purchaser does not believe would be applicable to the Merger if the
Merger occurred within one year of consummation of the Offer, would require,
among other things, that certain financial information concerning the Company,
and certain information relating to the fairness of the proposed transaction
and the consideration offered to stockholders of the Company therein, be filed
with the Commission and disclosed to stockholders of the Company prior to
consummation of the Merger.
 
  In addition, the Purchaser reserves the right to acquire, following the
consummation or termination of the Offer, additional Shares through open
market purchases, privately negotiated transactions, a tender offer or
exchange offer, or otherwise, upon such terms and at such prices as it shall
determine, which may be more or less favorable than those of the Offer. The
Purchaser and its affiliates also reserve the right to dispose of any or all
Shares acquired by them pursuant to the Offer or otherwise, upon such terms
and at such prices as they shall determine.
 
  In connection with the Offer, the Purchaser has reviewed, and will continue
to review, on the basis of available information, various possible business
strategies that it might consider in the event that it acquires all or
substantially all of the common equity interest in the Company. Upon the
completion of the Offer, the Purchaser intends to elect nominees of its choice
to the Company Board if it has not already done so. The Purchaser also intends
to conduct a detailed review of the Company and its assets, corporate
structure, capitalization, operations, properties, policies, management and
personnel and consider what, if any, changes would be desirable in light of
the circumstances which then exist. Such strategies could include, among other
things, changes in the Company's business, corporate structure, certificate of
incorporation, bylaws, capitalization, Company Board or management, and
consideration of disposition of certain assets or lines of business of the
Company. See "Background of the Offer--Comparison of the Proposals."
 
  Except as noted herein, the Purchaser does not have any present plans or
proposals that would result in an extraordinary corporate transaction, such as
a merger, reorganization or liquidation, or sale or transfer of a material
amount of assets, involving the Company or any of its subsidiaries, or any
material changes in the Company's corporate structure or business or any
change in its management. However, because the Purchaser has not had access to
the Company's books and records, additional changes may be made after a full
review of the Company's operations is completed.
 
MINIMUM TENDER CONDITION
 
  The Offer is conditioned upon, among other things, there being validly
tendered and not withdrawn prior to the Expiration Date a number of Shares
which, together with the Shares beneficially owned by the Purchaser and its
affiliates for their own respective accounts, will constitute at least a
majority of the total number of outstanding Shares on a fully diluted basis
(i.e., as though all options or other securities convertible into or
exercisable or exchangeable for Shares, other than the Rights, had been so
converted, exercised or exchanged) as of the date the Shares are accepted by
the Purchaser pursuant to the Offer. According to the Company's Quarterly
Report on Form 10-Q for the period ended September 30, 1995, there were
75,744,254 Shares outstanding as of October 31, 1995. According to the First
Interstate 8-K, there were 4,133,320 shares reserved for issuance pursuant to
employee stock options, the Company's dividend reinvestment plan and the
Company's stock purchase plan as of October 31, 1995 (the "Options"). In
addition, there are currently 15,073,106 Shares purported to be issuable to
FBS under certain circumstances pursuant to the Reciprocal Stock Option
Agreements. Assuming no options, warrants, rights or other securities
convertible into or exercisable or
 
                                      43
<PAGE>
 
exchangeable for Shares were issued or granted) after October 31, 1995, (other
than pursuant to the Reciprocal Stock Option Agreement), the Purchaser
believes there would be 94,950,680 Shares outstanding on a fully diluted basis
(i.e., as though all options or other securities convertible into or
exercisable or exchangeable for Shares, other than the Rights, had been so
converted, exercised or exchanged). Accordingly, the Purchaser believes that
the Minimum Tender Condition would be satisfied if at least an aggregate of
47,475,341 Shares are validly tendered pursuant to the Offer and not
withdrawn. The Purchaser reserves the right (but shall not be obligated),
subject to the rules and regulations of the Commission, to waive or amend the
Minimum Tender Condition and to purchase fewer than such number of Shares as
would satisfy the Minimum Tender Condition pursuant to the Offer.
 
WELLS FARGO STOCKHOLDER APPROVAL CONDITION
 
  The Offer is conditioned, among other things, upon the satisfaction of the
Wells Fargo Stockholder Approval Condition. Pursuant to the rules of the NYSE
(on which the Wells Fargo Common Stock is listed), the issuance of Wells Fargo
Common Stock must be approved by a majority vote of the holders of Wells Fargo
Common Stock voting at a meeting of such holders if the number of shares of
Wells Fargo Common Stock to be issued will be equal to or in excess of 20% of
the shares outstanding prior to such issuance. The Purchaser intends to seek
such approval at a special stockholders meeting to be called in early 1996. It
is contemplated that such meeting will be held prior to the time that the
respective stockholders of the Company and FBS meet to vote upon the FIB/FBS
Merger Agreement and the transaction contemplated thereby.
 
RIGHTS PLAN AND DGCL 203 CONDITION
 
  Insofar as the Rights Plan and DGCL 203 Condition relates to the Rights,
this condition may be satisfied in a number of ways, including the following:
(i) the Company Board may determine that the Offer is a Qualified Offer (as
defined below) or may redeem or amend the Rights so they would not be
triggered by the Offer and the Merger, (ii) pursuant to a consent solicitation
of a type referred to under "Background of the Offer--General," the Purchaser
could succeed in replacing the Company Board with new directors who would
(subject to fiduciary duties) take such actions as may be necessary with
respect to the Rights so that they would not be triggered by the Offer or the
Merger or (iii) the Purchaser could be successful in its litigation seeking,
among other things, invalidation of the Rights or an injunction requiring the
Company Board to redeem the Rights. See "Background of the Offer--Litigation."
 
  Insofar as the Rights Plan and DGCL 203 Condition relates to Section 203 of
the DGCL, this condition may be satisfied in a number of ways, including the
following: (i) the Company Board may approve the Offer for purposes of Section
203, (ii) pursuant to a consent solicitation of a type referred to under
"Background of the Offer--General," the Purchaser could succeed in replacing
the Company Board with new directors who would (subject to fiduciary duties)
approve the Offer for purposes of Section 203, or (iii) the Purchaser could be
successful in its litigation seeking, among other things, a declaratory
judgment that the exemption afforded by Section 203(b)(6) of the DGCL is
applicable to the Offer or, alternatively, an injunction requiring the Company
Board to approve the Offer for purposes of Section 203. (Since the Offer was
announced after the Company approved the FIB/FBS Merger, the Purchaser
believes that such exemption is applicable to the Offer and Merger.) See
"Background of the Offer--Litigation" and Section 203, a copy of which is
attached hereto as Schedule B.
 
  Set forth below is certain additional information concerning the Rights and
Section 203 of the DGCL:
 
Rights Agreement
 
  On November 21, 1988, the Company Board declared a dividend of one common
share purchase right (a "Right") for each outstanding Share, to the holders of
record on December 30, 1988 and authorized and directed the issuance of one
Right with respect to each Share that shall become outstanding after December
30, 1988 and before the earliest to occur of (i) December 31, 1998, (ii) the
date the Rights are redeemed or (iii) the Distribution Date (as defined
below).
 
                                      44
<PAGE>
 
  The terms of the Rights are set forth in a Rights Agreement, dated November
21, 1988 (the "Rights Agreement"), between the Company and First Interstate
Bank of California, as successor Rights Agent. The following description of
the Rights does not purport to be complete and is qualified in its entirety by
reference to the Rights Agreement. Each Right entitles the registered holder
thereof to purchase from the Company one Share at a price of $170, subject to
adjustment. The Rights will expire on December 31, 1998, unless such date is
extended or unless such Rights are redeemed earlier, and will not be
exercisable or transferable separately from the Shares until (i) 10 days
following a public announcement that a person or group of persons (other than
the Company, any subsidiary of the Company, any employee benefit plan of the
Company or any subsidiary of the Company or any entity holding Shares pursuant
to the terms of any such plan) has become the beneficial owner of 20% or more
of the outstanding Shares (a "Company Acquiring Person"), or (ii) 10 business
days (or such later date as may be determined by action of the Company Board)
following the commencement of, or announcement of an intention to make, a
tender offer or exchange offer by any person or group of persons (other than
the Company, any subsidiary of the Company, any employee benefit plan of the
Company or any subsidiary of the Company or any entity holding Shares pursuant
to the terms of any such plan) the consummation of which would result in the
beneficial ownership by a person of 20% or more of such outstanding Shares
(the earlier of such dates being the "Company Distribution Date"). According
to the Company Schedule 14D-9, the Company Board determined to postpone the
occurrence of the Company Distribution Date as a result of the public
announcement of the Offer until such later date as determined by the Company
Board.
 
  On November 5, 1995, the Company amended the Rights Agreement so that FBS
and its affiliates are excluded from the definition of Company Acquiring
Person.
 
  At any time prior to the time a person or group of persons becomes a Company
Acquiring Person, the Company Board may redeem the Rights in whole, but not in
part, at a price of $.001 per Right, rounded upward for each holder to the
nearest $.01.
 
  In the event that (i) the Company is acquired in a merger or other business
combination transaction other than a merger which follows a tender or exchange
offer for all outstanding Shares at a price and on terms determined to be
adequate and otherwise in the best interests of the Company and its
stockholders by at least a majority of the members of the Company Board who
are not officers of the Company (a "Qualified Offer") or (ii) 50% or more of
the Company's consolidated assets or earning power are sold, proper provision
will be made so that each holder of a Right, except as otherwise provided in
the Rights Agreement, will thereafter have the right to receive, upon the
exercise thereof at the then current exercise price of the Right, that number
of shares of common stock of the acquiring corporation which at the time of
such transaction will have a market value of two times the exercise price of
the Right. In the event that any person becomes a Company Acquiring Person
(other than pursuant to a Qualified Offer) or during such time as there is a
Company Acquiring Person, except upon terms disclosed in a Qualified Offer,
there occurs any reclassification of securities, recapitalization,
reorganization, or merger of the Company or issuance of securities by the
Company which increases by more than 1% the proportionate share of any class
of equity securities of the Company beneficially owned by any Company
Acquiring Person, each holder of a Right, other than Rights beneficially owned
by the Company Acquiring Person (which will thereafter be void), will
thereafter have the right to receive upon exercise that number of Shares
having a market value of two times the exercise price of the Right. Until a
Right is exercised, the holder thereof, as such, will have no rights as a
stockholder of the Company, including, without limitation, the right to vote
or to receive dividends.
 
  At any time after a person or group of persons becomes a Company Acquiring
Person prior to the acquisition by a Company Acquiring Person of 50% or more
of the outstanding Shares, the Company's Board may exchange the Rights other
than Rights owned by such Company Acquiring Person (which shall have become
void), in whole or in part, at an exchange ratio of one Share per Right
(subject to adjustment).
 
  The terms of the Rights may be amended by the Company Board without the
consent of the holders of the Rights; provided, however, that from and after
such time as any person becomes a Company Acquiring Person,
 
                                      45
<PAGE>
 
the terms of the Rights may not be amended in any manner which adversely
affect the interests of the holder of the Rights.
 
  The Rights have certain anti-takeover effects. The Rights will cause
substantial dilution to a person or group of persons that attempts to acquire
the Company in a manner which causes the Rights to become exercisable.
 
 DGCL 203
 
  Section 203 of the DGCL, in general, prohibits a Delaware corporation such
as the Company from engaging in a Business Combination (as defined in Section
203) with an Interested Stockholder (as defined in Section 203) for a period
of three years following the date that such person became an Interested
Stockholder unless (a) prior to the date that such person became an Interested
Stockholder, the board of directors of the corporation approved either the
Business Combination or the transaction that resulted in the stockholder
becoming an Interested Stockholder, (b) upon consummation of the transaction
that resulted in the stockholder becoming an Interested Stockholder, the
Interested Stockholder owned at least 85% of the voting stock of the
corporation outstanding at the time the transaction commenced, excluding stock
held by directors who are also officers of the corporation and employee stock
plans that do not provide employees with the right to determine confidentially
whether shares held subject to the plan will be tendered in a tender or
exchange offer, (c) a business combination is proposed by an Interested
Stockholder prior to the consummation or abandonment of and subsequent to the
public announcement of a proposed transaction which (i) constitutes a merger
or consolidation of the corporation, (ii) is with or by a person who either
was not an interested stockholder during the previous 3 years or who became an
interested stockholder with the approval of the corporation's board of
directors and (iii) is approved or not opposed by a majority of the board of
directors then in office who were directors prior to any person becoming an
Interested Stockholder during the previous three years, or (d) on or
subsequent to the date such person became an Interested Stockholder, the
Business Combination is approved by the board of directors of the corporation
and authorized at a meeting of stockholders, and not by written consent, by
the affirmative vote of the holders of at least 66 2/3% of the outstanding
voting stock of the corporation not owned by the Interested Stockholder. A
copy of Section 203 of the DGCL has been annexed as Schedule B hereto.
 
FIB/FBS MERGER AGREEMENT CONDITION
 
  The Offer is conditioned upon, among other things, the stockholders of the
Company not having approved the FIB/FBS Merger Agreement, which requires the
approval of the holders of a majority of the Shares. The FIB/FBS Merger
Agreement Condition shall not have been satisfied if such approval shall have
been obtained.
 
REGULATORY APPROVAL CONDITION
 
  The Offer is conditioned upon, among other things, all regulatory approvals
required to consummate the Offer and Merger having been obtained and remaining
in full force and effect, all statutory waiting periods in respect thereof
having expired and no such approval containing any conditions or restrictions
which the Board of Directors of the Purchaser reasonably determines in good
faith will have or reasonably be expected to have a Material Adverse Effect.
The Regulatory Approval Condition is virtually identical to the regulatory
condition for consummating the FIB/FBS Merger. As used in this Prospectus, the
term "Material Adverse Effect" has the same substantive meaning as given to
that term in the FIB/FBS Merger Agreement. Specifically, the term "Material
Adverse Effect" means material adverse effect on the business, results of
operations or financial condition of the Purchaser, the Company and their
respective subsidiaries taken as a whole or a material adverse effect on the
Purchaser's ability to consummate the transactions contemplated hereby;
provided, however, that in determining whether a Material Adverse Effect has
occurred there shall be excluded any effect the cause of which is (i) any
change in banking and similar laws, rules or regulations of general
applicability or interpretations thereof by courts or governmental
authorities, (ii) any change in generally accepted accounting principles or
regulatory accounting requirements applicable to banks, thrifts or their
holding companies generally, (iii) any action or omission of the Purchaser or
any subsidiary of the Purchaser in contemplation of the Merger, (iv) any
 
                                      46
<PAGE>
 
changes in general economic conditions affecting banks, thrifts or their
holding companies generally and (v) in the case of members of the Savings
Association Insurance Fund ("SAIF") of the FDIC, the funding of the SAIF.
 
  The Purchaser will use its reasonable best efforts to obtain the requisite
regulatory approvals (the "Requisite Regulatory Approvals"), which include
approval from the Federal Reserve Board and various state and foreign
regulatory authorities. (The obligation to use reasonable best efforts to
obtain the Requisite Regulatory Approvals is the same obligation that FBS has
agreed to under the FIB/FBS Merger Agreement.) Applications seeking the
Requisite Regulatory Approvals have been or soon will be filed. The Offer
and/or the Merger cannot proceed in the absence of the Requisite Regulatory
Approvals. Although no assurances can be given, the Purchaser anticipates that
it will receive all regulatory approvals on a timely basis. In this regard,
the Company Schedule 14D-9 states that the Company Board determined "it was
likely that each of FBS and Wells would ultimately receive all [regulatory]
approvals."
 
  As mentioned above, the Purchaser believes that consummation of the FIB/FBS
Merger is subject to the making of substantially identical filings and the
receipt of identical regulatory approvals as the Offer and the Merger and
believes that the regulators will consider the Purchaser's applications for
approval of the Offer and the Merger in a time frame substantially identical
to that of the FBS applications for approval of the FIB/FBS Merger.
 
  The Offer and the Merger are subject to approval by the Federal Reserve
Board pursuant to Sections 3 and 4 of the BHCA. Assuming Federal Reserve Board
approval, the Offer may not be consummated until 30 days after such approval,
during which time the Department of Justice may challenge the Offer on
antitrust grounds and seek the divestiture of certain assets and liabilities.
With the approval of the Federal Reserve Board and the Department of Justice,
the waiting period may be reduced to no less than 15 days.
 
  The Federal Reserve Board is prohibited from approving any transaction under
the applicable statutes which:
 
   (i) would result in a monopoly or which would be in furtherance of any
 combination or conspiracy to monopolize or to attempt to monopolize the
 business of banking in any part of the United States; or
 
   (ii) may have the effect in any section of the United States of
 substantially lessening competition, or tending to create a monopoly, or
 resulting in a restraint of trade, unless the Federal Reserve Board finds
 that the anti-competitive effects of the transaction are clearly outweighed
 in the public interest by the probable effect of the transaction in meeting
 the convenience and needs of the communities to be served.
 
  In reviewing the Offer and the Merger, the Department of Justice could
analyze their effect on competition differently than the Federal Reserve
Board, and thus it is possible that the Department of Justice could reach a
different conclusion than the Federal Reserve Board regarding their
competitive effects. The Federal Reserve Board will also consider the
financial and managerial resources of the companies and their subsidiary
banks.
 
  In addition, under the Community Reinvestment Act of 1977, as amended (the
"CRA"), the Federal Reserve Board must take into account the record of
performance of each of the Purchaser and the Company in meeting the credit
needs of the entire community, including low and moderate income
neighborhoods, served by each company. As part of the review process, the
Federal Reserve Board frequently receives comments and protests from community
groups and others. The Purchaser's principal bank, Wells Fargo Bank, N.A.
(which represents approximately 90% of the Purchaser's consolidated assets),
has received an "Outstanding" rating, the CRA's highest rating. The Company's
principal subsidiary bank has a "Satisfactory" rating; its other subsidiary
banks have "Satisfactory" or "Outstanding" ratings. FBS's principal subsidiary
bank has a "Satisfactory" rating.
 
  The Federal Reserve Board will furnish notice and a copy of the application
for approval of the Offer and the Merger to the Office of the Comptroller of
the Currency (the "OCC"), the FDIC and the appropriate state
 
                                      47
<PAGE>
 
regulatory authorities. These agencies have 30 days to submit their views and
recommendations to the Federal Reserve Board. The Federal Reserve Board is
required to hold a public hearing in the event it receives a written
recommendation of disapproval of the application from any of these agencies
within such 30-day period. Furthermore, Federal Reserve Board regulations
require publication of notice of, and the opportunity for public comment on,
the application submitted by the Purchaser for approval of the Offer and the
Merger and authorize the Federal Reserve Board to hold a public hearing in
connection therewith if the Federal Reserve Board determines that such a
hearing would be appropriate.
 
  The Purchaser expects that the Federal Reserve Board and the Department of
Justice will require that the Purchaser divest certain operations in order to
alleviate what such agencies believe would be an adverse competitive effect.
In its application filed with the Federal Reserve Bank of San Francisco, the
Purchaser committed to divest approximately $905 million in deposits to
alleviate adverse competitive effects. It is possible that the Federal Reserve
and/or the Department of Justice will request a more substantial divestiture.
Although any potential divestitures may affect certain pro forma combined
financial statement amounts, merger and restructuring costs, cost savings and
revenues, the Purchaser believes that the aggregate amount and financial
impact of any such divestitures will not be material and will not have a
Material Adverse Effect.
 
  Under Section 4 of the BHCA and related regulations, the Federal Reserve
Board must consider whether the performance of the Purchaser's and the
Company's nonbanking activities on a combined basis can reasonably be expected
to produce benefits to the public (such as greater convenience, increased
competition and gains in efficiency) that outweigh possible adverse effects
(such as undue concentration of resources, decreased or unfair competition,
conflicts of interest and unsound banking practices). This consideration
includes an evaluation of the financial and managerial resources of the
Purchaser and the Company and the effect of the proposed transaction on those
resources.
 
  In addition, the Merger will require certain approvals, notices or
exemptions in California and in certain other states and foreign jurisdictions
where the Purchaser and the Company are engaged in business. The Purchaser
does not currently anticipate any significant difficulties in obtaining such
approvals or any material impact on the operations of the combined entity if
any such approvals are not obtained.
 
CERTAIN OTHER CONDITIONS OF THE OFFER
 
  Notwithstanding any other provision of the Offer, the Purchaser shall not be
required to accept for exchange or exchange any Shares, may postpone the
acceptance for exchange of or exchange for tendered Shares, and may, in its
sole discretion, terminate or amend the Offer as to any Shares not then
exchanged for if at the Expiration Date, any of the Minimum Tender Condition,
the Wells Fargo Stockholder Approval Condition, the Rights Plan and DGCL 203
Condition, the FIB/FBS Merger Agreement Condition or the Regulatory Approval
Condition (in each case as defined on the cover page of this Prospectus) has
not been satisfied or, with respect to the Minimum Tender Condition, the Wells
Fargo Stockholder Approval Condition, the Rights Plan and DGCL 203 Condition
and the FIB/FBS Merger Agreement Condition, waived, or if on or after     ,
199  and at or prior to the time of exchange of any such Shares (whether or
not any Shares have theretofore been accepted for exchange or exchanged
pursuant to the Offer), any of the following events shall not have occurred:
 
  (a) The shares of Wells Fargo Common Stock which shall be issued to the
stockholders of the Company in the Offer and the Merger shall have been
authorized for listing on the NYSE, subject to official notice of issuance.
 
  (b) The Registration Statement shall have become effective under the
Securities Act, and no stop order suspending the effectiveness of the
Registration Statement shall have been issued and no proceedings for that
purpose shall have been initiated or threatened by the Commission.
 
  (c) No order, injunction or decree issued by any court or agency of
competent jurisdiction or other legal restraint or prohibition preventing the
consummation of the Offer and/or the Merger or any of the other
 
                                      48
<PAGE>
 
transactions contemplated by this Prospectus shall be in effect. No statute,
rule, regulation, order, injunction or decree shall have been enacted,
entered, promulgated or enforced by any court, administrative agency or
commission or other governmental authority or instrumentality which prohibits,
restricts or makes illegal the consummation of the Offer and/or the Merger.
 
  (d) (i) The representations and warranties of the Company in the FIB/FBS
Merger Agreement with respect to capitalization, authority, financial
statements, and absence of certain changes or events shall be true and correct
in all material respects as of the date of this Prospectus and (except to the
extent such representations and warranties speak as of an earlier date) as of
the Expiration Date as though made on and as of the Expiration Date and (ii)
the representations and warranties of the Company set forth in the FIB/FBS
Merger Agreement other than those specifically enumerated in clause (i) hereof
shall be true and correct in all respects as of the date of this Prospectus
and (except to the extent such representations and warranties speak as of an
earlier date) as of the Expiration Date as though made on and as of the
Expiration Date; provided, however, that for purposes of determining the
satisfaction of the condition contained in this clause (ii), no effect shall
be given to any exception in such representations and warranties relating to
materiality or a Material Adverse Effect, and provided, further, however,
that, for purposes of this clause (ii), such representations and warranties
shall be deemed to be true and correct in all respects unless the failure or
failures of such representations and warranties to be so true and correct,
individually or in the aggregate, results or would reasonably be expected to
result in a Material Adverse Effect on the Company and its subsidiaries taken
as a whole.
 
  The foregoing conditions are for the sole benefit of the Purchaser and may
be asserted by the Purchaser regardless of the circumstances giving rise to
any such conditions (including any action or inaction by the Purchaser) or may
be waived by the Purchaser in whole or in part. The determination as to
whether any condition has occurred shall be in the sole judgment of the
Purchaser and will be final and binding on all parties. The failure by the
Purchaser at any time to exercise any of the foregoing rights shall not be
deemed a waiver of any such right and each such right shall be deemed a
continuing right which may be asserted at any time and from time to time.
Notwithstanding the fact that the Purchaser reserves the right to assert the
occurrence of a condition following acceptance for payment but prior to
payment in order to delay payment or cancel its obligation to exchange
properly tendered Shares, the Purchaser will either promptly exchange such
Shares or promptly return such Shares.
 
  The conditions to the Offer set forth herein are identical in all material
respects to the conditions of FBS to effect the FIB/FBS Merger, except that:
 
  (a) FBS does not have to effect the FIB/FBS Merger unless FBS receives a
letter from its accountants to the effect that the FIB/FBS Merger will qualify
for "pooling of interests" accounting treatment.
 
  (b) FBS does not have to effect the FIB/FBS Merger unless it receives an
opinion of its counsel to the effect that the FIB/FBS Merger will be treated
for Federal income tax purposes as a reorganization within the meaning of
Section 368(a) of the Code and that accordingly no gain or loss will be
recognized by FBS or the Company as a result of the FIB/FBS Merger and no gain
or loss will be recognized by the stockholders of the Company who exchange
their Shares solely for FBS Common Stock pursuant to the FIB/FBS Merger.
 
  (c) FBS does not have to effect the FIB/FBS Merger unless the Company has
performed in all material respects its obligations required to be performed by
it under the FIB/FBS Merger Agreement at or prior to the closing of the
FIB/FBS Merger, and FBS shall have received a certificate signed on behalf of
the Company by the Chief Executive Officer and the Chief Financial Officer to
such effect.
 
  (d) The Purchaser does not have to accept for exchange or exchange any
Shares pursuant to the Offer and can terminate or amend the Offer if the
stockholders of the Company have approved the FIB/FBS Merger Agreement.
 
                                      49
<PAGE>
 
RELATIONSHIPS WITH THE COMPANY
 
  On November 1, 1995, the Purchaser acquired 100 Shares at a price of $124
5/8 per Share (excluding mark-ups or commissions) in an open market purchase.
Additionally, as of October 20, 1995, the Purchaser held 1,961,095 Shares (or
approximately 2.6% of the outstanding Shares) in a fiduciary capacity. The
Purchaser disclaims beneficial ownership of the Shares owned in such fiduciary
capacity and any other Shares held by any pension plan of the Purchaser or any
affiliates of the Purchaser. Except as set forth herein, and except for Philip
J. Quigley, Director of the Purchaser, who beneficially owns 500 Shares,
neither the Purchaser nor, to the best of its knowledge, any of the persons
listed in Schedule A hereto nor any associate or majority-owned subsidiary of
any of the foregoing, beneficially owns or has a right to acquire any equity
securities of the Company. Except as set forth above, neither the Purchaser
nor, to the best of its knowledge, any of the persons or entities referred to
above, nor any director, executive officer or subsidiary of any of the
foregoing, has effected any transaction in such equity securities during the
past 60 days.
 
  Except as set forth herein, neither the Purchaser nor, to the best of its
knowledge, any of the persons listed in Schedule A hereto has any contract,
arrangement, understanding or relationship with any other person with respect
to any securities of the Company, including, but not limited to, any contract,
arrangement, understanding or relationship concerning the transfer or the
voting of any such securities, joint ventures, loan or option arrangements,
puts or calls, guaranties of loans, guaranties against loss or the giving or
withholding of proxies. Except as described herein, there have been no
contacts, negotiations or transactions since November 1, 1995, between the
Purchaser or, to the best of its knowledge, any of the persons listed in
Schedule A hereto, on the one hand, and the Company or its affiliates, on the
other hand, concerning a merger, consolidation or acquisition, a tender offer
or other acquisition of securities, an election of directors, or a sale or
other transfer of a material amount of assets. Neither the Purchaser, nor, to
the best of its knowledge, any of the persons listed in Schedule A hereto, has
since November 1, 1995 had any transaction with the Company or any of its
executive officers, directors or affiliates that would require disclosure
under the rules and regulations of the Commission applicable to the Offer.
 
FEES AND EXPENSES
 
  [       is acting as Dealer Manager in connection with the Offer pursuant to
a Dealer Manager Agreement (the "Dealer Manager Agreement"). The Purchaser has
agreed to pay     , as compensation for its financial advisory service
(including services as Dealer Manager) in connection with the Offer, a fee of
$   . Upon the effectiveness of the Registration Statement, of which this
Prospectus forms a part, the Purchaser has agreed to pay     an additional fee
of $   . If the Purchaser consummates the Offer and the Merger, the Purchaser
has agreed to pay      an additional fee of $   . In addition, the Purchaser
has agreed to reimburse      for its reasonable out-of-pocket expenses,
including the fees and expenses of its counsel, in connection with the Offer,
and has agreed to indemnify      against certain liabilities and expenses in
connection with the Offer, including liabilities under the federal securities
laws.
 
  The Purchaser has also retained D.F. King & Co., Inc. to act as Information
Agent in connection with the Offer. The Information Agent may contact holders
of Shares by mail, telephone, telex, telegraph and personal interviews and may
request brokers, dealers and other nominee stockholders to forward the Offer
materials to beneficial owners of Shares. The Information Agent will receive a
fee estimated not to exceed $200,000 for such services, plus reimbursement of
out-of-pocket expenses and the Purchaser will indemnify the Information Agent
against certain liabilities and expenses in connection with the Offer,
including liabilities under federal securities laws.
 
  The Purchaser will pay the Exchange Agent reasonable and customary
compensation for its services in connection with the Offer, plus reimbursement
for out-of-pocket expenses, and will indemnify the Exchange Agent against
certain liabilities and expenses in connection therewith, including
liabilities under the federal securities laws. Brokers, dealers, commercial
banks and trust companies will be reimbursed by the Purchaser for customary
mailing and handling expenses incurred by them in forwarding material to their
customers.]
 
                                      50
<PAGE>
 
ACCOUNTING TREATMENT
 
  Upon consummation of the Offer, the Purchaser will account for the
acquisition of the Shares using the purchase method of accounting in
accordance with Accounting Principles Board Opinion No. 16, "Business
Combinations," as amended. See "Background of the Offer--Comparison of the
Proposals--Purchase Versus Pooling of Interests Accounting." Accordingly, the
purchase price will be allocated to assets acquired and liabilities assumed
based on their estimated fair values at the consummation date. Income (or
loss) of the Company prior to the consummation date will not be included in
income of the combined company.
 
STOCK EXCHANGE LISTING
 
  The Wells Fargo Common Stock is listed on the NYSE, the PSE, the London
Stock Exchange and the Frankfurt Stock Exchange. Application will be made to
list the shares of Wells Fargo Common Stock to be issued pursuant to the Offer
on the NYSE.
 
                                      51
<PAGE>
 
                            BUSINESS OF WELLS FARGO
 
  Today, the Purchaser operates one of the largest banking businesses in the
United States. The Purchaser provides a broad range of financial products and
services through electronic and traditional channels. Customers can access
accounts electronically seven days a week, 24 hours a day. Besides serving as
banker to millions of California households, the Purchaser provides a full
range of banking and financial services to commercial, corporate, real estate
and small business customers across the nation. Its primary lines of business
are highlighted below.
 
  The Retail Distribution Group sells and services a complete line of retail
financial products for consumers and small businesses. It encompasses a branch
network (including supermarket branches and banking centers), the 24-hour
Customer Sales and Service Centers (telephone banking), the ATM network and
Wells Fargo ON-LINE, the Purchaser's personal computer banking service. In
addition, Retail Distribution includes product management for the consumer
checking business, which primarily uses the branches as a source of new
customers.
 
  As part of the ongoing effort to provide higher-convenience, lower-cost
service to customers, the Purchaser has opened supermarket branches, which are
a more efficient delivery channel for a full line of retail banking services,
and banking centers throughout California. The supermarket banking centers
(modularly-designed kiosks equipped with ATMs and a customer service telephone
and staffed by a banking officer) are capable of providing substantially all
consumer services.
 
  The Business Banking Group provides a full range of financial services to
small businesses, including credit, deposits, investments, payroll services,
retirement programs and credit and debit card services. Business Banking
customers include small businesses with annual sales up to $10 million in
which the owner of the business is also the principal financial decision
maker.
 
  The Investment Group is responsible for the sales and management of savings
and investment products, investment management and brokerage services,
including the Stagecoach and Overland Express Funds and personal trust,
employee benefit trust and agency assets. It also includes product management
for market rate accounts, savings deposits, Individual Retirement Accounts and
time deposits.
 
  Real Estate products and services include construction loans for commercial
and residential development, land acquisition and development loans, secured
and unsecured lines of credit, interim financing arrangements for completed
buildings, rehabilitation loans, affordable housing loans and letters of
credit. Secondary market services are provided through the Real Estate Capital
Markets Group, whose business includes purchases of distressed loans at a
discount, mezzanine financing, acquisition financing, origination of permanent
loans for securitization, syndications, commercial real estate loan servicing
and real estate pension fund advisory services.
 
  The Wholesale Products Group includes the Commercial Banking Group, which
serves businesses with annual sales of $5 million to $250 million, and the
Corporate Banking Group, which maintains relationships with major corporations
throughout the United States. The group is responsible for soliciting and
maintaining credit and noncredit relationships with businesses by offering a
variety of products and services including traditional commercial loans and
lines of credit, letters of credit, trade facilities and cash management.
 
  Consumer Lending offers a full array of consumer loan products ranging from
credit card loans and auto financing and leases to other installment loans and
lines of credit.
 
                                      52
<PAGE>
 
                   PRO FORMA COMBINED FINANCIAL INFORMATION
 
                                  (UNAUDITED)
 
  The following unaudited pro forma combined financial statements were
prepared in connection with Purchaser's Offer to exchange each outstanding
Share for two-thirds of a share of Wells Fargo Common Stock and give effect to
the purchase accounting adjustments and other assumptions described in the
accompanying notes. The unaudited pro forma combined balance sheet is based
upon the unaudited consolidated balance sheets of the Purchaser and the
Company as of September 30, 1995. The unaudited pro forma combined statements
of income are based on the consolidated statements of income of the Purchaser
and the Company for the nine-month period ended September 30, 1995 (unaudited)
and the year ended December 31, 1994. Certain information was derived from the
audited consolidated financial statements of the Company contained in its
Annual Report on Form 10-K that, for purposes of this Prospectus, are not
covered by reports of the Company's independent accountants. The pro forma
combined financial statements do not give effect to the anticipated cost
savings, the disposition of certain yet-to-be identified assets or the effects
of any required regulatory divestitures. Divestitures may affect certain pro
forma combined financial statement amounts, but the net effect of any required
divestitures is not expected to be material. In its application filed with the
Federal Reserve Bank of San Francisco, the Purchaser has committed to divest
$905 million in deposits to alleviate adverse competitive effects.
 
  The resolution of the pending matters pertaining to the assets and
liabilities of the Company described above, as well as the operations of the
Company subsequent to September 30, 1995, will affect the allocation of the
purchase price. In addition, changes to the adjustments already included in
the unaudited pro forma combined financial statements are expected as
valuations of assets and liabilities are completed and as additional
information becomes available. An increase in the unallocated portion of the
purchase price remaining after fair value adjustments will result in a greater
final allocation to goodwill which will have a corresponding impact on
amortization expense and will reduce tangible common equity. A decrease in the
unallocated portion of the purchase price remaining after fair value
adjustments will have the opposite effects. Accordingly, the final pro forma
combined amounts will differ from those set forth in the unaudited pro forma
combined financial statements.
 
  The information shown below should be read in conjunction with the
consolidated historical financial statements of the Purchaser and the Company,
including the respective notes, which are incorporated by reference in this
Prospectus (but which, in the case of the Company, are not covered by the
report of the Company's independent accountants for purposes of this
Prospectus) and the unaudited pro forma combined per share financial
information which appear elsewhere in this Prospectus. The pro forma data are
presented for comparative purposes only and are not necessarily indicative of
the combined financial position or results of operations in the future. The
pro forma data are also not necessarily indicative of the combined financial
position or results of operations which would have been realized had the
Acquisition been consummated during the periods or as of the dates for which
the pro forma financial statements are presented.
 
                                      53
<PAGE>
 
              WELLS FARGO & COMPANY AND FIRST INTERSTATE BANCORP
 
                       PRO FORMA COMBINED BALANCE SHEET
 
                             SEPTEMBER 30, 1995(A)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                       HISTORICAL
                              ----------------------------
                              WELLS FARGO FIRST INTERSTATE  PRO FORMA   PRO FORMA
                               & COMPANY      BANCORP      ADJUSTMENTS  COMBINED
                              ----------- ---------------- -----------  ---------
                                                           (NOTES B&C)
(IN MILLIONS)
<S>                           <C>         <C>              <C>          <C>
ASSETS
Cash and due from banks.....    $ 3,183       $ 5,916        $  --      $  9,099
Investment securities.......      9,436         9,432           --        18,868
Loans.......................     34,298        35,967           --        70,265
Allowance for loan losses...      1,872           847           --         2,719
                                -------       -------        ------     --------
  Net loans.................     32,426        35,120           --        67,546
                                -------       -------        ------     --------
Goodwill....................        391           697         5,679(D)     6,767
Other assets................      4,498         3,902         1,475(E)     9,875
                                -------       -------        ------     --------
  Total assets..............    $49,934       $55,067        $7,154     $112,155
                                =======       =======        ======     ========
LIABILITIES
Noninterest-bearing depos-
 its........................    $ 9,627       $17,044        $  --      $ 26,671
Interest-bearing deposits...     29,321        31,192           --        60,513
                                -------       -------        ------     --------
Total deposits..............     38,948        48,236           --        87,184
Federal funds purchased and
 securities sold under re-
 purchase agreements........      2,554           -- (1)        --         2,554
Senior and subordinated
 debt.......................      3,020         1,368           --         4,388
Other liabilities...........      1,538         1,482           --         3,020
                                -------       -------        ------     --------
  Total liabilities.........     46,060        51,086           --        97,146
                                -------       -------        ------     --------
STOCKHOLDERS' EQUITY
Preferred stock.............        489           350           --           839
Common stock................        237           169            83          489
Additional paid-in capital..      1,221         1,667         8,866       11,754
Retained earnings...........      1,932         2,436        (2,436)       1,932
Other.......................         (5)            1            (1)          (5)
Less: Treasury stock........        --           (642)          642          --
                                -------       -------        ------     --------
  Total stockholders' equi-
   ty.......................      3,874         3,981         7,154(F)    15,009
                                -------       -------        ------     --------
  Total liabilities and
   stockholders' equity.....    $49,934       $55,067        $7,154     $112,155
                                =======       =======        ======     ========
</TABLE>
- --------
(1) The balance of federal funds purchased and securities sold under
    repurchase agreements at September 30, 1995, if any, is presumed to be
    included in other liabilities.
 
 
             See notes to pro forma combined financial statements.
 
                                      54
<PAGE>
 
               WELLS FARGO & COMPANY AND FIRST INTERSTATE BANCORP
 
                     PRO FORMA COMBINED STATEMENT OF INCOME
 
                FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995(A)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                      HISTORICAL
                             ----------------------------
                             WELLS FARGO FIRST INTERSTATE  PRO FORMA   PRO FORMA
                              & COMPANY      BANCORP      ADJUSTMENTS  COMBINED
                             ----------- ---------------- -----------  ---------
(IN MILLIONS)
<S>                          <C>         <C>              <C>          <C>
INTEREST INCOME
Investment securities......    $  460         $  480         $ --       $  940
Loans......................     2,536          2,283           --        4,819
Other......................        78             26           --          104
                               ------         ------         -----      ------
  Total interest income....     3,074          2,789           --        5,863
                               ------         ------         -----      ------
INTEREST EXPENSE
Deposits...................       750            722           --        1,472
Federal funds purchased and
 securities sold under
 repurchase agreements.....       160            --            --          160
Senior and subordinated
 debt......................       152             90           --          242
Other......................        25             72           --           97
                               ------         ------         -----      ------
  Total interest expense...     1,087            884           --        1,971
                               ------         ------         -----      ------
NET INTEREST INCOME........     1,987          1,905           --        3,892
Provision for loan losses..       --             --            --          --
                               ------         ------         -----      ------
Net interest income after
 provision for loan
 losses....................     1,987          1,905           --        3,892
                               ------         ------         -----      ------
NONINTEREST INCOME
Service charges on deposit
 accounts..................       357            446           --          803
Fees and commissions.......       316            151           --          467
Trust and investment
 services income...........       176            123           --          299
Other......................        41            103           --          144
                               ------         ------         -----      ------
  Total noninterest
   income..................       890            823           --        1,713
                               ------         ------         -----      ------
NONINTEREST EXPENSE
Salaries and employee
 benefits..................       765            804           --        1,569
Net occupancy..............       159            294           --          453
Equipment..................       139            -- (1)        --          139
Federal deposit insurance..        47             58           --          105
Other......................       528            482           342 (G)   1,352
                               ------         ------         -----      ------
  Total noninterest
   expense.................     1,638          1,638           342       3,618
                               ------         ------         -----      ------
INCOME BEFORE INCOME
 TAXES.....................     1,239          1,090          (342)      1,987
Income tax expense.........       513            420           (83)(G)     850
                               ------         ------         -----      ------
NET INCOME.................    $  726         $  670         $(259)     $1,137
                               ======         ======         =====      ======
NET INCOME APPLICABLE TO
 COMMON STOCK..............    $  695         $  645         $(259)     $1,081
                               ======         ======         =====      ======
PER COMMON SHARE
Net income.................    $14.14                                   $10.85
                               ======                                   ======
Dividends declared.........    $ 3.45                                   $ 3.45
                               ======                                   ======
Average common shares
 outstanding...............      49.2                         50.4        99.6
                               ======                        =====      ======
</TABLE>
- --------
(1) Equipment expense for the Company is included in net occupancy.
 
             See notes to pro forma combined financial statements.
 
                                       55
<PAGE>
 
               WELLS FARGO & COMPANY AND FIRST INTERSTATE BANCORP
 
                     PRO FORMA COMBINED STATEMENT OF INCOME
 
                    FOR THE YEAR ENDED DECEMBER 31, 1994(A)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                      HISTORICAL
                             ----------------------------
                             WELLS FARGO FIRST INTERSTATE  PRO FORMA   PRO FORMA
                              & COMPANY      BANCORP      ADJUSTMENTS  COMBINED
                             ----------- ---------------- -----------  ---------
(IN MILLIONS)
<S>                          <C>         <C>              <C>          <C>
INTEREST INCOME
Investment securities......    $  740         $  844         $ --       $1,584
Loans......................     3,015          2,304           --        5,319
Other......................        10             44           --           54
                               ------         ------         -----      ------
  Total interest income....     3,765          3,192           --        6,957
                               ------         ------         -----      ------
INTEREST EXPENSE
Deposits...................       854            725           --        1,579
Federal funds purchased and
 securities sold under
 repurchase agreements.....        99            --            --           99
Senior and subordinated
 debt......................       192            106           --          298
Other......................        10             34           --           44
                               ------         ------         -----      ------
  Total interest expense...     1,155            865           --        2,020
                               ------         ------         -----      ------
NET INTEREST INCOME........     2,610          2,327           --        4,937
Provision for loan losses..       200            --            --          200
                               ------         ------         -----      ------
Net interest income after
 provision for loan
 losses....................     2,410          2,327           --        4,737
                               ------         ------         -----      ------
NONINTEREST INCOME
Service charges on deposit
 accounts..................       473            562           --        1,035
Fees and commissions.......       387            172           --          559
Trust and investment
 services income...........       203            193           --          396
Other......................       137            127           --          264
                               ------         ------         -----      ------
  Total noninterest
   income..................     1,200          1,054           --        2,254
                               ------         ------         -----      ------
NONINTEREST EXPENSE
Salaries and employee
 benefits..................     1,027          1,080           --        2,107
Net occupancy..............       215            228           --          443
Equipment..................       174            128           --          302
Federal deposit insurance..       101            103           --          204
Other......................       639            658           482(G)    1,779
                               ------         ------         -----      ------
  Total noninterest
   expense.................     2,156          2,197           482       4,835
                               ------         ------         -----      ------
INCOME BEFORE INCOME
 TAXES.....................     1,454          1,184          (482)      2,156
Income tax expense.........       613            450          (122)(G)     941
                               ------         ------         -----      ------
NET INCOME.................    $  841         $  734         $(360)     $1,215
                               ======         ======         =====      ======
NET INCOME APPLICABLE TO
 COMMON STOCK..............    $  798         $  701         $(360)     $1,139
                               ======         ======         =====      ======
PER COMMON SHARE
  Net income...............    $14.78                                   $10.69
                               ======                                   ======
  Dividends declared.......    $ 4.00                                   $ 4.00
                               ======                                   ======
Average common shares
 outstanding...............      53.9                         52.6       106.5
                               ======                        =====      ======
</TABLE>
 
             See notes to pro forma combined financial statements.
 
                                       56
<PAGE>
 
              WELLS FARGO & COMPANY AND FIRST INTERSTATE BANCORP
 
               NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS
 
                                  (UNAUDITED)
 
NOTE A: BASIS OF PRESENTATION
 
  The unaudited pro forma combined balance sheet combines the historical
consolidated balance sheets of the Purchaser and the Company as if the
Acquisition had been effective on September 30, 1995. The pro forma combined
statements of income for the nine-month period ended September 30, 1995 and
the year ended December 31, 1994 combine the historical consolidated
statements of income of the Purchaser and the Company as if the Acquisition
had been effective on January 1, 1994. Certain amounts in the historical
financial statements of the Company have been reclassified in the unaudited
pro forma combined financial statements to conform to the Purchaser's
historical financial statements.
 
  The Acquisition is accounted for as a purchase. Under this method of
accounting, assets and liabilities of the Company are adjusted to their
estimated fair value and combined with the recorded values of the assets and
liabilities of the Purchaser. Applicable income tax effects of such
adjustments are included as a component of the Purchaser's net deferred tax
asset. Certain transactions conducted in the ordinary course of business
between the Purchaser and the Company are immaterial and, accordingly, have
not been eliminated.
 
  The Purchaser has not had access to the Company's records in order to make
its determination of the fair value of their assets and liabilities. For
purposes of the pro forma financial statements, it has been assumed that the
net book value of the Company's assets (excluding intangibles) minus
liabilities approximates fair value.
 
  Following the Acquisition, the Purchaser intends to combine the operations
of and, subject to regulatory approvals, to merge the California subsidiary
banks of both institutions as well as certain other operations. In its
application with the Federal Reserve Bank of San Francisco, the Purchaser has
committed to divest $905 million in deposits to alleviate adverse competitive
effects. As of the date of this statement, no final determination with respect
to such matters has been made. The impact of any required divestitures is not
expected to be material. The Purchaser expects to achieve significant
operating cost savings as a result of the Acquisition. See "Background of the
Offer--Comparison of the Proposals." No adjustment has been included in the
unaudited pro forma combined financial statements for the anticipated
operating cost savings.
 
NOTE B: PURCHASE PRICE
 
  The purchase price is based on exchanging two-thirds of a share of Wells
Fargo Common Stock for each outstanding Share at the closing price per share
of Wells Fargo Common Stock on October 17, 1995, the last full business day
before announcement of the Original Proposal. Exercise of the Company's stock
options are not included in the number of outstanding Shares of the Company on
the assumption that all options will become equivalent options on Wells Fargo
Common Stock. In addition, the number of the Shares used in calculating the
total market value of Wells Fargo Common Stock to be issued in connection with
the Offer reflects an exchange of Wells Fargo Common Stock for the outstanding
Shares, exclusive of the Company's common stock equivalents.
 
  The total market value of the Wells Fargo Common Stock to be issued in
connection with the Acquisition is calculated as follows:
 
<TABLE>
   <S>                                                                 <C>
   The Company's common shares outstanding on September 30, 1995 (in
    thousands)........................................................   75,727
   Exchange ratio.....................................................      2/3
                                                                       --------
   Wells Fargo Common Stock to be issued (in thousands)...............   50,485
   Market price per share of Wells Fargo Common Stock at October 17,
    1995.............................................................. $213.625
                                                                       --------
     Total market value of Wells Fargo Common Stock to be issued (in
      millions)....................................................... $ 10,785
                                                                       ========
</TABLE>
 
                                      57
<PAGE>
 
              WELLS FARGO & COMPANY AND FIRST INTERSTATE BANCORP
 
         NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
                                  (UNAUDITED)
 
  In addition to the above market value of the Wells Fargo Common Stock to be
issued, the total purchase price will include other direct acquisition costs,
such as legal, investment banking and other professional fees.
 
NOTE C: ALLOCATION OF PURCHASE PRICE
 
  Certain matters are still pending that will have an effect on the ultimate
allocation of the purchase price. Accordingly, the allocation of the purchase
price has not been finalized and the portion of the purchase price allocated
to goodwill and the identifiable intangibles (discussed below) is subject to
change.
 
  The purchase price has been allocated as described in the table below:
 
<TABLE>
<CAPTION>
   (IN MILLIONS)
   <S>                                                          <C>    <C>
   Net assets applicable to the Company's common stock at Sep-
    tember 30, 1995...........................................         $ 3,631
   Increase to the Company's net asset value at September 30,
    1995 as a result of estimated fair value adjustments, net
    of applicable income tax effects:
     Purchased Credit Card Relationships*.....................  $  100
     Purchased Mortgage Servicing Rights*.....................      50
     Core Deposit Intangibles*................................   1,350
                                                                ------
       Total estimated fair value adjustments.................           1,500
   Elimination of the Company's existing goodwill and identi-
    fiable intangibles........................................            (722)
                                                                       -------
       Total preliminary allocation of purchase price.........           4,409
   Goodwill due to the Acquisition............................           6,376
                                                                       -------
       Total purchase price...................................         $10,785
                                                                       =======
</TABLE>
- --------
* Amounts are adjusted to a net-of-tax basis using an estimated marginal tax
  rate of 42.4%.
 
  It is expected that about $700 million of costs related to premises,
severance and other restructuring charges will be incurred in connection with
the Acquisition. To the extent that this amount includes costs related to the
Company's premises, employees and operations, they will affect the final
amount of goodwill as of the consummation of the Acquisition. The remaining
costs related to the Purchaser's premises, employees and operations as well as
all costs relating to systems conversions and other indirect, integration
costs will be expensed, either upon consummation of the Acquisition or as
incurred.
 
  In addition, goodwill does not include the effect of a potential $200
million purportedly payable to FBS pursuant to the Reciprocal Stock Option
Agreements and the Reciprocal Fee Letters. The Purchaser believes that the
Reciprocal Stock Option Agreements and the Reciprocal Fee Letters are not
permissible and should be invalidated. See "Background of the Offer--
Litigation."
 
NOTE D: CALCULATION OF GOODWILL ADJUSTMENT AND TOTAL GOODWILL DUE TO
ACQUISITION
 
<TABLE>
<CAPTION>
   (IN MILLIONS)
   <S>                                                                  <C>
   Purchase price...................................................... $10,785
   Company total common stockholders' equity...........................  (3,631)
   Net-of-tax identifiable intangibles.................................  (1,500)
   Company net-of-tax existing identifiable intangibles................      25
                                                                        -------
   Goodwill adjustment.................................................   5,679
   Company existing goodwill...........................................     697
                                                                        -------
   Total goodwill due to Acquisition................................... $ 6,376
                                                                        =======
</TABLE>
 
                                      58
<PAGE>
 
              WELLS FARGO & COMPANY AND FIRST INTERSTATE BANCORP
 
         NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
                                  (UNAUDITED)
 
  For purposes of the pro forma combined balance sheet, it has been assumed
that the net book value of the Company's assets (excluding intangibles) minus
liabilities approximates fair value.
 
NOTE E: OTHER ASSETS
 
  This amount includes an adjustment for identifiable intangibles of $2,562
million less a reduction in the Purchaser's net deferred tax asset of $1,087
million. The identifiable intangible adjustment represents a gross
identifiable intangibles balance of $2,605 million less the Company's existing
intangibles balance of $43 million. The net deferred tax asset adjustment
represents the deferred tax liability related to the gross identifiable
intangibles of $1,105 million partially offset by the reversal of the
Company's deferred tax liability of $18 million related to existing
identifiable intangibles.
 
  The net-of-tax identifiable intangibles of $1,500 million are amortized over
their estimated period of benefit (not exceeding 15 years) on an accelerated
basis.
 
NOTE F: STOCKHOLDERS' EQUITY
 
  The purchase price of $10,785 million is reduced by the Company's common
stockholders' equity of $3,631 million. The Purchaser will issue two-thirds of
a share of the Purchaser's common stock in exchange for each of the 75,727
thousand shares of the Company's outstanding common stock (based on the number
of Shares outstanding as of September 30, 1995). The price of the Purchaser's
stock on October 17, 1995 was $213 5/8; total par value of new common stock of
the Purchaser is $252 million. The remaining $10,533 million represents
additional paid-in capital. The Company's preferred stock will be converted
into the Purchaser's preferred stock and the Company's treasury stock will be
eliminated.
 
  Adjustments to stockholders' equity are as follows:
 
<TABLE>
<CAPTION>
                                              PURCHASE    COMPANY
                                               PRICE   COMMON EQUITY ADJUSTMENT
                                              -------- ------------- ----------
   (IN MILLIONS)
   <S>                                        <C>      <C>           <C>
   Common stock.............................. $   252     $  (169)    $    83
   Additional paid-in capital................  10,533      (1,667)      8,866
   Retained earnings.........................              (2,436)     (2,436)
   Treasury stock............................                 642         642
   Net unrealized (gains) losses on avail-
    able-for-sale securities.................                  (1)         (1)
                                              -------     -------     -------
     Total common stockholders' equity....... $10,785     $(3,631)    $ 7,154
                                              =======     =======     =======
</TABLE>
 
                                      59
<PAGE>
 
              WELLS FARGO & COMPANY AND FIRST INTERSTATE BANCORP
 
         NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS--(CONCLUDED)
 
                                  (UNAUDITED)
 
NOTE G: PURCHASE ACCOUNTING ADJUSTMENTS
 
  Adjustments are made to reflect the recording of intangibles as well as to
eliminate any intangible balances previously recorded by the Company in
accordance with the purchase method of accounting. It has been assumed that
the net book value of the Company's assets (excluding intangibles) minus
liabilities approximates fair value. The following purchase accounting
adjustments are based on the best available information and are subject to
change as new information becomes available. Purchase accounting adjustments
will be booked on a gross basis with related adjustments to the Purchaser's
net deferred tax asset as follows:
 
<TABLE>
<CAPTION>
                                                                 AMORTIZATION
                                                              ------------------
                                                              9 MONTHS   YEAR
                                                               ENDED     ENDED
                                          NET OF TAX  GROSS   9/30/95* 12/31/94*
                                          ---------- -------  -------- ---------
(IN MILLIONS)
<S>                                       <C>        <C>      <C>      <C>
DEBIT (CREDIT)
Goodwill and identifiable intangibles of
 the Company............................    $ (722)  $  (740)   $(45)    $ (60)
Goodwill due to the Acquisition.........     6,376     6,376     191       255
Identifiable intangibles due to the Ac-
 quisition..............................     1,500     2,605     196       287
                                            ------   -------    ----     -----
                                             7,154     8,241     342       482
Adjustment to Wells Fargo net deferred
 tax asset related to purchase account-
 ing adjustments........................       --     (1,087)    (83)     (122)
                                            ------   -------    ----     -----
  Total.................................    $7,154   $ 7,154    $259     $ 360
                                            ======   =======    ====     =====
</TABLE>
- --------
* Goodwill due to the Acquisition is amortized on a straight-line basis over
  25 years. Identifiable intangibles due to the Acquisition are amortized over
  their estimated period of benefit (not exceeding 15 years) on an accelerated
  basis.
 
                                      60
<PAGE>
 
                   DESCRIPTION OF WELLS FARGO CAPITAL STOCK
 
WELLS FARGO COMMON STOCK
 
  The Restated Certificate of Incorporation of the Purchaser (the "Wells Fargo
Certificate") provides that the Purchaser has authority to issue 150,000,000
shares of Wells Fargo Common Stock. On October 31, 1995, the Purchaser had
46,966,721 shares of Wells Fargo Common Stock issued and outstanding. In 1995,
the Purchaser authorized the continuation of certain stock repurchase
programs. For a full description of these programs see "--Repurchases of Wells
Fargo Common Stock."
 
  Holders of shares of Wells Fargo Common Stock are entitled to one vote per
share for each share held. Subject to the rights of holders of shares of the
Purchaser's outstanding preferred stock ("the Wells Fargo Preferred Stock")
(as described below), holders of shares of Wells Fargo Common Stock have equal
rights to participate in dividends when declared and, in the event of
liquidation, in the net assets of the Purchaser available for distribution to
stockholders. The Purchaser may not declare any dividends on the Wells Fargo
Common Stock unless full preferential amounts to which holders of Wells Fargo
Preferred Stock are entitled have been paid or declared and set apart for
payment upon all outstanding shares of Wells Fargo Preferred Stock. The
Purchaser is also subject to certain contractual and regulatory restrictions
on the payment of dividends. See "Certain Regulatory Considerations."
 
  The holders of shares of Wells Fargo Common Stock do not have preemptive
rights or preferential rights of subscription for any shares of Wells Fargo
Common Stock or other securities of the Purchaser. Outstanding shares of Wells
Fargo Common Stock are, and shares to be issued pursuant to the Offer will be,
fully paid and nonassessable.
 
  First Chicago Trust Company of New York is the transfer agent and registrar
for the Wells Fargo Common Stock.
 
REPURCHASES OF WELLS FARGO COMMON STOCK
 
  In April, 1995, the Wells Fargo Board of Directors authorized the repurchase
of up to 4,957,991 shares of Wells Fargo Common Stock, representing 10 percent
of the Purchaser's outstanding Common Stock as of March 31, 1995. This
authorization continues a repurchase program which the Purchaser began in
1994, and is supplemental to the shares of Wells Fargo Common Stock the
Purchaser routinely buys to offset stock issued or expected to be issued under
its employee benefit and dividend reinvestment plans. There is no scheduled
date for completion of the repurchase program and it is expected that the
Purchaser will purchase shares from time to time, subject to market
conditions.
 
  During the nine months ended September 30, 1995, the Purchaser repurchased
3,785,927 shares (net of issuances of 720,627 shares) of Wells Fargo Common
Stock. For the year ended December 31, 1994, the Purchaser repurchased
4,560,944 shares (net of issuances of 561,653 shares) of Wells Fargo Common
Stock.
 
WELLS FARGO PREFERRED STOCK
 
  The Wells Fargo Certificate provides that the Purchaser is authorized to
issue 25,000,000 shares of Wells Fargo Preferred Stock. The Wells Fargo
Preferred Stock may be issued from time to time in one or more series and the
Wells Fargo Board is authorized to determine or alter the powers, preferences
and rights, and the qualifications, limitations or restrictions to be granted
to or imposed upon the Wells Fargo Preferred Stock or any series thereof with
respect to any wholly unissued class or series of Wells Fargo Preferred Stock,
and to fix the number of shares constituting any such series and the
designation thereof, or any of them. Thus, the Wells Fargo Board is authorized
to establish, designate and fix with respect to each series of Wells Fargo
Preferred Stock the specific designation of that series, the number of shares,
the dividend rate, right of redemption and the price, terms and manner of
redemption, special and relative rights on liquidation, sinking fund
provisions, conversion rights and voting rights, all without further action by
the holders of Wells Fargo Common Stock.
 
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<PAGE>
 
  Because the Purchaser is a holding company, its rights, the rights of its
creditors and of its stockholders, including the holders of the shares of the
Wells Fargo Preferred Stock, to participate in any distribution of the assets
of any subsidiary upon the latter's liquidation or recapitalization will be
subject to the prior claims of the subsidiary's creditors, except to the
extent that the Purchaser may itself be a creditor with recognized claims
against the subsidiary. The principal source of the Purchaser's revenues are
dividends received from its banking and other subsidiaries. Various statutory
provisions limit the amount of dividends its bank subsidiaries and certain
nonbank subsidiaries can pay without regulatory approval, and various
regulations can also restrict the payment of dividends. In addition, federal
statutes limit the ability of its bank subsidiaries to make loans to the
Purchaser. See "--Certain Regulatory Considerations."
 
  The following is a brief description of certain terms of the outstanding
series of Wells Fargo Preferred Stock. This description does not purport to be
complete and is qualified in its entirety by reference to the Wells Fargo
Certificate, including the certificate of designations with respect to each
such series.
 
  The shares of Wells Fargo Preferred Stock now outstanding have preference
over Wells Fargo Common Stock with respect to the payment of dividends and the
distribution of assets in the event of liquidation, winding up or dissolution
of the Purchaser. Each of such series ranks on a parity with one another as to
dividends and the distribution of assets upon liquidation, winding up or
dissolution.
 
  Generally, the holders of each series of Wells Fargo Preferred Stock have no
voting rights. However, if the equivalent of six quarterly dividends payable
on a series of Wells Fargo Preferred Stock are in default, the number of
directors of the Purchaser will be increased by two and the holders of such
outstanding series of Wells Fargo Preferred Stock together with the holders of
shares of every other series of Wells Fargo Preferred Stock similarly entitled
to vote for the election of two directors, acting together as a single class,
will be entitled to elect two of the authorized number of members of the Wells
Fargo Board at the next annual meeting and at each subsequent annual meeting
of stockholders to serve until all dividends accumulated have been fully paid
or set apart for payment. Each series of Wells Fargo Preferred Stock is listed
on the NYSE.
 
  Wells Fargo Series B Preferred Stock. As of November 15, 1995, there were
issued and outstanding 1,500,000 shares of Adjustable Rate Cumulative
Preferred Stock, Series B, par value $5.00 per share (the "Wells Fargo Series
B Preferred Stock"). The Wells Fargo Series B Preferred Stock is redeemable at
the option of the Purchaser, in whole or in part, through May 14, 1996 at a
price of $51.50 per share and, thereafter, at $50 per share, plus accrued and
unpaid dividends to the redemption date.
 
  Dividends on the Wells Fargo Series B Preferred Stock are cumulative and
payable quarterly on the fifteenth day of February, May, August and November
of each year at the rate of 76% of the highest of the three-month Treasury
Bill discount rate, 10-year constant maturity Treasury security yield or 20-
year constant maturity Treasury security yield, but in no event shall be less
than 5.5% per annum or greater than 10.5% per annum. The average dividend rate
was 5.7%, 5.6% and 6.2% during 1994, 1993 and 1992, respectively.
 
  Wells Fargo Series C Preferred Stock. As of November 15, 1995, there were
issued and outstanding 477,500 shares of 9% Preferred Stock, Series C, par
value $5.00 per share (the "Wells Fargo Series C Preferred Stock"), evidenced
by 9,550,000 depositary shares, each representing a one-twentieth interest in
a share of Wells Fargo Series C Preferred Stock. The Wells Fargo Series C
Preferred Stock is redeemable at the option of the Purchaser, in whole or in
part, on and after October 24, 1996 at a price of $500 per share (equivalent
to $25 per depositary share) plus accrued and unpaid dividends to the
redemption date.
 
  Dividends on the Wells Fargo Series C Preferred Stock of $11.25 per share
(9% annualized rate) are cumulative and are paid quarterly on the last day of
each March, June, September and December (equivalent to $0.56 per annum per
depositary share).
 
  Wells Fargo Series D Preferred Stock. As of November 15, 1995, there were
issued and outstanding 350,000 shares of 8 7/8% Preferred Stock, Series D, par
value $5.00 per share (the "Wells Fargo Series D
 
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<PAGE>
 
Preferred Stock"), evidenced by 7,000,000 depositary shares, each representing
a one-twentieth interest in a share of Wells Fargo Series D Preferred Stock.
The Wells Fargo Series D Preferred Stock is redeemable at the option of the
Purchaser, in whole or in part, on and after March 5, 1997 at a price of $500
per share (equivalent to $25 per depositary share) plus accrued and unpaid
dividends to the redemption date.
 
  Dividends on the Wells Fargo Series D Preferred Stock of $11.09 per share 
(8 7/8% annualized rate) are cumulative and are paid quarterly on the last day
of each March, June, September and December (equivalent to $0.55 per annum per
depositary share).
 
CERTAIN REGULATORY CONSIDERATIONS
 
  SUPERVISION AND REGULATION. The following discussion addresses the
regulatory framework applicable to bank holding companies and their
subsidiaries, and provides certain specific information relevant to the
Purchaser. Regulation of financial institutions such as the Purchaser and its
subsidiaries is intended primarily for the protection of depositors, the
deposit insurance funds of the FDIC and the banking system as a whole, and
generally is not intended for the protection of stockholders or other
investors.
 
  In the following discussion, references to statutes and regulations are
brief summaries thereof and are qualified in their entirety by reference to
such statutes and regulations. In addition, there are other statutes and
regulations that apply to the operation of banking institutions. Changes in
the applicable laws, and in their application by regulatory agencies, cannot
necessarily be predicted, but they may have a material effect on the business
and results of the Purchaser.
 
  As a bank holding company, the Purchaser is subject to regulation,
supervision and examination by the Federal Reserve Board under the BHCA. Under
the BHCA, bank holding companies may not, in general, directly or indirectly
acquire ownership or control of more than 5% of the voting shares of any
company, including a bank or bank holding company, without the prior approval
of the Federal Reserve Board. In addition, bank holding companies are
generally prohibited from engaging in nonbanking (i.e., commercial or
industrial) activities, subject to certain exceptions under the BHCA.
 
  The Purchaser's banking subsidiaries, as national banking associations, are
subject to regulation, supervision and examination by the OCC.
 
  Depository institutions are also affected by various state and Federal laws,
including those relating to consumer protection and similar matters, as well
as by the fiscal and monetary policies of the Federal government and its
agencies, including the Federal Reserve Board. An important purpose of these
policies is to curb inflation and control recessions through control of the
supply of money and credit. The Federal Reserve Board uses its powers to
establish reserve requirements of depository institutions and to conduct open
market operations in United States government securities so as to influence
the supply of money and credit. These policies have a direct effect on the
availability of bank loans and deposits and on interest rates charged on loans
and paid on deposits, with the result that Federal policies have a material
effect on the earnings of the banking subsidiaries, and, hence, the Purchaser.
 
  The Purchaser also has other financial services subsidiaries that are
subject to regulation, supervision and examination by the Federal Reserve
Board, as well as other applicable state and Federal regulatory agencies. For
example, the Purchaser's discount brokerage and asset management subsidiaries
are subject to supervision and regulation by the Commission, the National
Association of Securities Dealers, Inc. and state securities regulators; and
the Purchaser's insurance subsidiaries are subject to regulation by the
insurance regulatory authorities of the various states. Other nonbank
subsidiaries of the Purchaser are subject to other laws and regulations of
both the Federal government and the various states in which they are
authorized to do business.
 
  DIVIDEND RESTRICTIONS. The Purchaser is a legal entity separate and distinct
from its banking and other subsidiaries. The principal source of cash flow of
the Purchaser, including cash flow to pay dividends on the
 
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Purchaser's common and preferred stock and debt service on the Purchaser's
debt, is dividends from its banking and other subsidiaries. Various Federal
and state statutes and regulations limit the amount of dividends that may be
paid to the Purchaser by its banking subsidiaries without regulatory approval.
 
  The approval of the OCC is required for the payment of any dividend by a
national bank if the total of all dividends declared by the board of directors
of such bank in any calendar year would exceed the total of (i) the bank's
retained net profits (as defined and interpreted by regulation) for the
current year plus (ii) the retained net profits (as defined and interpreted by
regulation) for the preceding two years, less any required transfer to surplus
or a fund for the retirement of any preferred stock. In addition, a national
bank can pay dividends only to the extent that retained net profits (including
the portion transferred to surplus) exceed bad debts (as defined and
interpreted by regulation).
 
  In addition, if, in the opinion of the applicable Federal banking 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 institution, could include the payment of dividends) the
agency may require, after notice and hearing, that such institution cease and
desist from such practice. The OCC has indicated that paying dividends that
would deplete a depository institution's capital base to an inadequate level
would be an unsafe and unsound practice. Moreover, under the Federal Deposit
Insurance Act (the "FDI Act"), an insured depository institution may not pay
any dividend if payment would cause it to become undercapitalized or once it
is undercapitalized. See "--Regulatory Capital Standards and Related Matters."
Also, the Federal bank regulatory agencies have issued policy statements which
provide that FDIC-insured depository institutions and their holding companies
should generally pay dividends only out of current operating earnings.
 
  HOLDING COMPANY STRUCTURE. Transactions Involving Banking Subsidiaries. The
Purchaser's banking subsidiaries are subject to Federal Reserve Act
restrictions which limit the transfer of funds or other items of value from
such subsidiaries to the Purchaser and (with certain exceptions) to the
Purchaser's nonbanking subsidiaries (together, "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,
each covered transaction by a banking subsidiary with one of its affiliates is
limited in amount to 10% of that banking subsidiary's capital and surplus (as
defined and interpreted by regulation) and, with respect to all covered
transactions with affiliates, in the aggregate, to 20% of that banking
subsidiary's capital and surplus. Furthermore, loans and extensions of credit
are required to be secured in specified amounts.
 
  Source of Strength Doctrine. Under Federal Reserve Board policy, a bank
holding company is expected to serve 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 by the Federal Reserve Board at times when the Purchaser may not have
the resources to provide it or, for other reasons, would not otherwise be
inclined to provide it. Certain loans by a bank holding company to any of its
subsidiary banks are subordinate in right of payment to deposits in, and
certain other indebtedness of, the subsidiary bank. In addition, in the event
of a bank holding company's bankruptcy, any commitment by a 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 such institution (including claims by the FDIC as
subrogee of insured depositors) and certain claims for administrative expenses
of the FDIC as a receiver would be afforded a priority over other general
unsecured claims against such an institution. If an insured depository
institution fails, insured and uninsured depositors, along with the FDIC, will
be placed ahead of unsecured, nondeposit creditors, including a parent holding
company, in order of priority of payment.
 
  Liability of Commonly Controlled Institutions. Under the FDI Act, an insured
depository institution that is under common control with another insured
depository institution is generally liable for any loss incurred, or
 
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<PAGE>
 
reasonably anticipated to be incurred, by the FDIC in connection with the
default of such commonly controlled institution, or any assistance provided by
the FDIC to any such commonly controlled institution that is in danger of
default. The term "default" is defined generally to mean the appointment of a
conservator or receiver and the term "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. Capital Guidelines. The
Federal Reserve Board, the FDIC and the OCC have adopted substantially similar
risk-based and leverage capital guidelines for United States banking
organizations. The guidelines establish a systematic, analytical framework
that makes regulatory capital requirements sensitive to differences in risk
profiles among banking organizations, takes off-balance sheet exposure into
account in assessing capital adequacy and reduces disincentives to holding
liquid, low-risk assets. The risk-based capital ratio is determined by
classifying assets and specified off-balance sheet financial instruments into
weighted categories with higher levels of capital being required for
categories perceived as representing greater risk. The Federal bank regulatory
agencies have indicated that in assessing the capital adequacy of a banking
organization they will consider, among other things, interest rate risk, and
are each considering a proposal to incorporate an explicit mechanism by which
interest rate risk would be incorporated into the risk-based capital
standards. Federal Reserve Board policy also provides that banking
organizations generally, and, in particular, those that are experiencing
internal growth or actively making acquisitions, are expected to maintain
capital positions that are substantially above the minimum supervisory levels,
without significant reliance on intangible assets.
 
  Under these risk-based capital standards, the minimum consolidated ratio of
total capital to risk-adjusted assets (including certain off-balance sheet
items, such as standby letters of credit) required by the Federal Reserve
Board for bank holding companies, such as the Purchaser, is currently 8%. At
least one-half of the total capital must be comprised 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 ("Tier I capital").
The remainder may consist of qualifying hybrid capital instruments, perpetual
debt, mandatory convertible debt securities, a limited amount of subordinated
debt, preferred stock that does not qualify as Tier I capital and a limited
amount of loan and lease loss reserves ("Tier II capital"). As of September
30, 1995, the Purchaser's Tier I and total capital to risk-adjusted assets
ratios were 8.56% and 12.25%, respectively. At September 30, 1995, on a pro
forma combined basis after giving effect to the Offer and the Merger on a
purchase accounting basis, the Purchaser's estimated consolidated Tier I
capital and total capital to risk-adjusted assets ratios would be 8.07% and
11.31%, respectively.
 
  In addition to the risk-based standard, the Purchaser is subject to minimum
leverage ratio guidelines. The leverage ratio is defined to be the ratio of a
bank holding company's Tier I capital to its total consolidated quarterly
average assets less goodwill and certain other intangible assets (the
"Leverage Ratio"). These guidelines provide for a minimum Leverage Ratio of 3%
for bank holding companies that have the highest supervisory rating. All other
bank holding companies must maintain a minimum Leverage Ratio of at least 4%
to 5%. Neither the Purchaser nor any of its banking subsidiaries has been
advised by the appropriate Federal banking regulator of any specific Leverage
Ratio applicable to it. As of September 30, 1995, the Purchaser's Leverage
Ratio was 6.93%. At September 30, 1995, on a pro forma combined basis after
giving effect to the Offer and the Merger on a purchase accounting basis, the
Purchaser's estimated consolidated Leverage Ratio would be 6.56%.
 
  The reductions in the Purchaser's pro forma combined capital ratios are due
to the effect of the Company's capital ratios, which are lower than the
Purchaser's.
 
  The Purchaser's banking subsidiaries are also subject to capital
requirements substantially similar to those imposed by the Federal Reserve
Board on bank holding companies. As of September 30, 1995, each of the
Purchaser's banking subsidiaries had capital in excess of the foregoing
minimum regulatory ratio requirements.
 
  Prompt Corrective Action. The FDI Act requires the federal banking agencies
to take "prompt corrective action" in respect of depository institutions that
do not meet minimum capital requirements. A depository
 
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<PAGE>
 
institution's treatment for purposes of the prompt corrective action
provisions will depend upon how its capital levels compare to various relevant
capital measures and certain other factors, as established by regulation.
 
  The OCC has adopted regulations establishing relevant capital measures and
relevant capital levels. The relevant capital measures are the total capital
ratio, Tier 1 capital ratio and the Leverage Ratio. Under the regulations, a
national bank will be: (i) "well capitalized" if it has a total capital ratio
of 10% or greater, a Tier 1 capital ratio of 6% or greater and a Leverage
Ratio of 5% or greater and is not subject to any order or written directive by
any such regulatory authority to meet and maintain a specific capital level
for any capital measure; (ii) "adequately capitalized" if it has a total
capital ratio of 8% or greater, a Tier 1 capital ratio of 4% or greater and a
Leverage Ratio of 4% or greater (3% in certain circumstances) and is not "well
capitalized," (iii) "undercapitalized" if it has a total capital ratio of less
than 8%, a Tier 1 capital ratio of less than 4% or a Leverage Ratio of less
than 4% (3% in certain circumstances); (iv) "significantly undercapitalized"
if it has a 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 (v) "critically
undercapitalized" if its tangible equity is equal to or less than 2% of
average quarterly tangible assets. In addition, a bank's primary federal
banking agency is authorized to downgrade the bank's capital category to the
next lower category upon a determination that the bank is 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. As of September 30, 1995, all of
the Purchaser's subsidiary banks had capital levels that qualify them as being
"well capitalized" under such regulations.
 
  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
therefore be "undercapitalized". "Undercapitalized" depository institutions
are subject to limitations on, among other things, asset growth; acquisitions;
branching; new business lines; acceptance of brokered deposits; and borrowings
from the Federal Reserve System 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 such capital restoration plan. The aggregate
liability of the parent holding company is limited to the lesser of (i) an
amount equal to 5% of the depository institution's total assets at the time it
became "undercapitalized", and (ii) the amount which is necessary (or would
have been necessary) to bring the institution into compliance with all capital
standards applicable with respect to such institution as of the time it fails
to comply with the plan. If a depository institution fails to submit an
acceptable plan, it is treated as if it is "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.
 
  FDIC Insurance. On August 8, 1995, the FDIC amended its regulations on
insurance assessments to establish a new assessment rate schedule of 4 to 31
cents per $100 of insured deposits in replacement of the previous schedule of
23 to 31 cents (based on each institution's assigned risk classification) per
$100 of insured deposits for institutions whose deposits are subject to
assessment by the Bank Insurance Fund ("BIF"). All of the Purchaser's insured
deposits are subject to assessments payable to BIF. The new BIF schedule
became effective on June 1, 1995, the first day of the month after the month
in which BIF reached its "designated reserve ratio" of 1.25% of total
estimated insured deposits. Assessments collected under the previous
assessment schedule in excess of the amount due under the new schedule were
refunded, with interest, from the effective date of the new schedule. The
Purchaser's subsidiary banks received an aggregate refund of approximately $23
million. An institution's risk classification is based on an assignment of the
institution by the FDIC to one of three capital groups and to one of three
supervisory subgroups. The capital groups are "well capitalized," "adequately
capitalized" and "undercapitalized." The three supervisory subgroups are Group
"A" (for
 
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financially solid institutions with only a few minor weaknesses), Group "B"
(for those institutions with weaknesses which, if uncorrected, could cause
substantial deterioration of the institution and increase the risk to the
deposit insurance fund) and Group "C" (for those institutions with a
substantial probability of loss to the fund absent effective corrective
action).
 
  On November 14, 1995, the Board of Directors of the FDIC approved a further
reduction in the assessment schedule for BIF deposits. Effective January 1,
1996, the assessment schedule will range from 0 to 27 cents per $100 of
deposits subject to BIF assessments, based on each institution's risk
classification.
 
  Various legislative proposals regarding the future of BIF and the SAIF have
recently been reported, which generally provide for a special assessment on
SAIF deposits. While the ultimate outcome of the legislative process cannot be
predicted, the Purchaser does not expect these proposals to have an effect on
its financial condition. The Purchaser's bank subsidiaries currently hold no
deposits subject to assessments payable to SAIF.
 
  As part of the currently pending Budget Reconciliation Act for fiscal year
1996, the House-Senate Conference Committee has proposed an assessment on all
FDIC-insured depository institutions to provide funds for payment of interest
on Financing Corporation debt when due. If enacted, this proposal would result
in minimum BIF insurance premiums, which are expected to be approximately 2.5
cents on each $100 in deposits subject to BIF assessments.
 
  Interstate Banking and Other Recent Legislation. Under the Riegle-Neal
Interstate Banking and Branching Efficiency Act of 1994 (the "Interstate
Act"), which became effective on September 29, 1995, bank holding companies
are permitted to acquire banks located in any state regardless of the state
law in effect at the time. The Interstate Act also provides for the nationwide
interstate branching of banks. Under the Interstate Act, both national and
state-chartered banks will be permitted to merge across state lines (and
thereby create interstate branches) commencing on June 1, 1997. States are
permitted to "opt-out" of the interstate branching authority by taking action
prior to the commencement date. States may also "opt-in" early (i.e., prior to
June 1, 1997) to the interstate branching provisions.
 
  In addition to the matters discussed above, there have been proposed a
number of legislative and regulatory proposals designed to strengthen the
Federal deposit insurance system and to improve the overall financial
stability of the U.S. banking system, and to provide for other changes in the
bank regulatory structure, including proposals to reduce regulatory burdens on
banking organizations and to expand the nature of products and services banks
and bank holding companies may offer. It is impossible to predict whether or
in what form these proposals may be adopted in the future, and, if adopted,
what their effect will be on the Purchaser.
 
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<PAGE>
 
    COMPARISON OF RIGHTS OF HOLDERS OF SHARES AND WELLS FARGO COMMON STOCK
 
  Pursuant to the Offer, stockholders of the Company who elect to receive
Wells Fargo Common Stock in exchange for Shares will become stockholders of
the Purchaser. The following is a summary of certain similarities and material
differences between the rights of holders of Shares and the rights of holders
of Wells Fargo Common Stock. As each of the Company and the Purchaser is
organized under the laws of Delaware, these differences arise solely from
various provisions of the certificate of incorporation and by-laws of each of
the Company and the Purchaser and the Rights Agreement.
 
  The following summary does not purport to be a complete statement of the
rights of stockholders under the the Company's Composite Certificate of
Incorporation (the "Company Certificate"), the Bylaws of the Company (the
"Company Bylaws") and the Rights Agreement as compared with the rights of the
Purchaser's stockholders under the Wells Fargo Certificate and the Bylaws of
Wells Fargo, as amended April 18, 1995 (the "Wells Fargo Bylaws"), or a
complete description of the specific provisions referred to herein. The
identification of specific differences is not meant to indicate that other
equally or more significant differences do not exist. The summary is qualified
in its entirety by reference to the DGCL and the governing corporate
instruments of the Company and the Purchaser, to which stockholders are
referred.
 
SPECIAL MEETINGS OF STOCKHOLDERS
 
  Under Delaware law, special meetings of the stockholders may be called by
the board of directors or such other persons as may be authorized by the
certificate of incorporation or bylaws. The Company Bylaws provide that a
special meeting may also be called by the Chairman of the Board, or in his
absence or when the office of Chairman of the Board is vacant, by the
President, and shall be called by the Chairman of the Board, or in his absence
or when the office of Chairman of the Board is vacant, by the President, or
the Secretary, at the request in writing of stockholders owning a majority of
the outstanding capital stock entitled to vote. The Wells Fargo Bylaws provide
that a special meeting may also be called by the Chairman of the Board, the
President, the Chief Executive Officer (if other than the Chairman of the
Board or the President), or one or more stockholders holding not less than 10%
of the voting power of the corporation.
 
NUMBER OF DIRECTORS
 
  Under Delaware law, the number of directors shall be fixed by or in the
manner provided in the bylaws, unless the certificate of incorporation fixes
the number of directors, in which case a change in the number of directors
shall be made only by amendment to the certificate. The Company Bylaws provide
that the Company Board is to consist of not less than three nor more than 26
directors, as shall be determined by resolution of the Board. The Wells Fargo
Bylaws provide that the Wells Fargo Board of Directors is to consist of not
less than ten nor more than 20 directors, the exact number to be fixed from
time to time by a bylaw adopted by the stockholders or by the Board of
Directors, but until some other number is so fixed, the number of directors
shall be 14.
 
ADVANCE NOTICE OF STOCKHOLDER NOMINATIONS OF DIRECTORS
 
  Under the Company Bylaws, nominations of persons for election to the Company
Board may be made at a meeting of stockholders by any stockholder, provided
that the Secretary of the Company receives written notice not less than 30
days nor more than 60 days prior to the meeting. If less than 40 days' notice
or prior public disclosure of the date of the meeting is given or made by the
Company to stockholders, the notice of a nomination must be received not later
than the close of business on the tenth day following the day on which such
notice of the date of the meeting was mailed or public disclosure was made.
Notices of nominations, among other things, must state the nominee's name,
age, business and residential address and principal occupation and employment,
as well as the class and number of Shares of the Company beneficially owned by
such nominee and any other information about the nominee required to be
disclosed in solicitations for proxies for the election
 
                                      68
<PAGE>
 
of directors pursuant to Rule 14a of the Exchange Act. In addition, the notice
must state the name and record address of the nominating stockholder and the
class and number of shares of the Company beneficially owned by the
stockholder. The Wells Fargo Bylaws do not contain any similar advance notice
provisions for the nomination of directors.
 
STOCKHOLDER PROPOSAL PROCEDURES
 
  Under the Company Bylaws, business is properly brought before an annual
meeting if the Secretary of the Company receives written notice not less than
30 days nor more than 60 days prior to the annual meeting. If less than 40
days' notice or prior public disclosure of the date of the annual meeting is
given or made by the Company to stockholders, notice by the stockholder must
be received not later than the close of business on the tenth day following
the day on which such notice of the date of the annual meeting was mailed or
public disclosure was made. Stockholder notices must state, among other
things, a brief description of the business desired to be brought before the
annual meeting and the reasons for conducting such business at the annual
meeting, the name and record address of the stockholder proposing the
business, the class and number of shares of the Company beneficially owned by
the stockholder and any material interest in such business. The Wells Fargo
Bylaws do not contain any similar advance notice provisions for stockholder
proposals.
 
INDEMNIFICATION
 
  Both the Company Bylaws and the Wells Fargo Bylaws provide for the
indemnification of directors, officers and persons serving at the request of
the respective corporations as a director, officer, employee or agent of
another corporation or of a partnership, joint venture, trust or other
enterprise to the fullest extent authorized by the DGCL. The Wells Fargo
Bylaws also mandatorily extend this right to indemnification to all employees
of Wells Fargo, whereas the Company Bylaws provide that this right to
indemnification may only be extended to employees and agents by action of the
Company Board of Directors.
 
CERTAIN VOTING RIGHTS FOR MERGERS
 
  Under Delaware law, any merger, consolidation or sale of all or
substantially all of the assets of a corporation requires the approval of the
holders of a majority (unless the certificate of incorporation requires a
higher percentage) of the outstanding shares of such corporation entitled to
vote thereon. Neither the Company Certificate nor the Wells Fargo Certificate
requires a higher percentage.
 
CUMULATIVE VOTING
 
  Under Delaware law, stockholders of a corporation are not entitled to
cumulate their votes in the election of directors unless the corporation's
certificate of incorporation so provides. Neither the Company Certificate nor
the Wells Fargo Certificate provides for cumulative voting.
 
REMOVAL OF DIRECTORS; FILLING VACANCIES ON THE BOARD OF DIRECTORS
 
  Under Delaware law, any or all directors of a corporation which does not
have cumulative voting or a classified board may be removed, with or without
cause, by the holders of a majority of the shares entitled to vote at an
election of directors, unless such corporation's certificate of incorporation
provides otherwise. Neither the Company Certificate nor the Wells Fargo
certificate provides otherwise.
 
  Under Delaware law, vacancies and newly-created directorships resulting from
any increase in the authorized number of directors may be filled by a majority
of the directors in office. Under both the Company Bylaws and the Wells Fargo
Bylaws, such vacancies and newly-created directorships may also be filled by
the stockholders of the respective corporations.
 
                                      69
<PAGE>
 
STOCKHOLDER ACTION BY WRITTEN CONSENT
 
  Under Delaware law, unless otherwise provided in the certificate of
incorporation, any action which may be taken at any annual or special meeting
may be taken without a meeting and without prior notice, if a consent in
writing, setting forth the action so taken, shall be signed by the holders of
outstanding shares having not less than the minimum number of votes that would
be necessary to authorize or take such action at a meeting at which all shares
entitled to vote thereon were present and voted. Neither the Company
Certificate nor the Wells Fargo Certificate contains provisions to the
contrary.
 
AMENDMENT OF BYLAWS
 
  Under Delaware law, the power to adopt, amend or repeal bylaws is vested in
the stockholders unless the certificate of incorporation confers the power to
adopt, amend or repeal bylaws upon the directors as well. Both the Company
Certificate and the Wells Fargo Certificate confer such power on their
respective boards of directors.
 
CLASSIFICATION OF BOARD OF DIRECTORS
 
  Delaware law permits (but does not require) a certificate of incorporation
to provide that a board of directors be divided into classes, with each class
having a term of office longer than one year but not longer than three years.
Neither the Company Certificate nor the Wells Fargo Certificate provides for
classes of directors.
 
                                      70
<PAGE>
 
                          MARKET PRICES AND DIVIDENDS
 
WELLS FARGO
 
  The Wells Fargo Common Stock is listed and principally traded on the NYSE
and is also listed on the PSE, London Stock Exchange and Frankfurt Stock
Exchange. The following table sets forth the range of high and low sales
prices as reported on the NYSE Composite Tape, together with the per share
dividends declared by the Purchaser, during the periods indicated.
 
<TABLE>
<CAPTION>
                                                        PRICE RANGE
                                                     -----------------
QUARTER                                                HIGH     LOW    DIVIDENDS
- -------                                              -------- -------- ---------
<S>                                                  <C>      <C>      <C>
1993:
  First............................................. $109 1/2 $ 75 1/2   $0.50
  Second............................................  120       95 3/4    0.50
  Third.............................................  127 3/8  107 1/4    0.50
  Fourth............................................  133      105 7/8    0.75
1994:
  First............................................. $147 1/2 $127 5/8   $1.00
  Second............................................  159 1/2  136 5/8    1.00
  Third.............................................  160 3/8  145 1/8    1.00
  Fourth............................................  149 5/8  141        1.00
1995:
  First............................................. $160 5/8 $143 3/8   $1.15
  Second............................................  185 7/8  157        1.15
  Third.............................................  189      177 3/4    1.15
  Fourth (through November 22, 1995)................  230 1/4  186 7/8    1.15
</TABLE>
 
  On October 17, 1995, the last trading day prior to public announcement of
the Original Proposal, the closing sales price per share of Wells Fargo Common
Stock was $213 5/8. On October 18, 1995, the trading day of the announcement
of the Original Proposal, such price was $229. On November 10, 1995, the last
trading day prior to announcement of the Offer, such price was $215 3/8. On
November 22, 1995, the last full trading day prior to the date of this
preliminary prospectus, such price was $213 3/8. Past price performance is not
necessarily indicative of likely future price performance. Holders of Shares
are urged to obtain current market quotations for shares of Wells Fargo Common
Stock.
 
  In January 1995, the Purchaser increased the quarterly dividend on the Wells
Fargo Common Stock to $1.15 per share.
 
  Holders of Wells Fargo Common Stock are entitled to receive dividends from
funds legally available therefor when, as and if declared by the Board of
Directors of the Purchaser. The Board of Directors of the Purchaser presently
intends to continue the policy of paying quarterly cash dividends. Future
dividends of the Purchaser will depend upon the earnings of the Purchaser and
its subsidiaries, their financial condition and other factors including
applicable governmental regulations and policies. See "Description Of Wells
Fargo Capital Stock--Certain Regulatory Considerations."
 
                                      71
<PAGE>
 
THE COMPANY
 
  The Shares are listed and principally traded on the NYSE and are also listed
on the Boston Stock Exchange, Cincinnati Stock Exchange, Midwest Stock
Exchange, Philadelphia-Baltimore-Washington Stock Exchange and the PSE. The
following table sets forth the range of high and low sales prices as reported
on the NYSE Composite Tape, together with the per Share dividends declared by
the Company, during the periods indicated.
 
<TABLE>
<CAPTION>
                                                        PRICE RANGE
                                                     -----------------
QUARTER                                                HIGH     LOW    DIVIDENDS
- -------                                              -------- -------- ---------
<S>                                                  <C>      <C>      <C>
1993:
  First............................................. $ 58 7/8 $ 44 1/2   $0.30
  Second............................................   64 1/2   52 1/2    0.40
  Third.............................................   67       58 3/8    0.40
  Fourth............................................   68       53 1/2    0.50
1994:
  First............................................. $ 79 1/8 $ 62 3/8   $0.50
  Second............................................   85       71 3/4    0.75
  Third.............................................   84 1/8   72        0.75
  Fourth............................................   81 1/2   66 7/8    0.75
1995:
  First............................................. $ 82 1/8 $ 68 5/8   $0.75
  Second............................................   88 1/4   75 1/8    0.75
  Third.............................................  103       79 3/4    0.80
  Fourth (through November 22, 1995)................  141 3/8  100 1/8    0.80
</TABLE>
 
  On October 17, 1995, the last trading day prior to public announcement of
the Original Proposal, the closing sales price was $106 per Share. On October
18, 1995, the trading day of the announcement of the Original Proposal, such
price was $140 1/4. On November 10, 1995, the last trading day prior to the
announcement of the Offer, such price was $134 3/4. On November 22, 1995, the
last full trading day prior to the date of this preliminary prospectus, such
price was $134 1/8. Past price performance is not necessarily indicative of
likely future price performance. Holders of Shares are urged to obtain current
market quotations for Shares.
 
  In July 1995, the Company increased the quarterly dividend on the Shares to
$0.80 per Share.
 
  Holders of Shares are entitled to receive dividends from funds legally
available therefor when, as and if declared by the Company Board. Future
dividends of the Company will depend upon the earnings of the Company and its
subsidiaries, their financial condition and other factors including applicable
governmental regulations and policies.
 
  The Rights are listed on the NYSE, but are currently attached to all
outstanding Shares and may not be traded separately. As a result, the sales
prices per Share set forth above are also the high and low sales prices per
Share and associated Right during such periods. Upon occurrence of the Company
Distribution Date, the Rights are to trade separately from the Shares.
According to the Company Schedule 14D-9, the Company Board determined to
postpone the occurrence of the Company Distribution Date as a result of the
public announcement of the Offer until such later date as determined by the
Company Board.
 
                                      72
<PAGE>
 
                     VALIDITY OF WELLS FARGO COMMON STOCK
 
  The validity of the shares of Wells Fargo Common Stock offered hereby will
be passed upon for the Purchaser by Sullivan & Cromwell, 125 Broad Street, New
York, New York 10004.
 
                                    EXPERTS
 
  The consolidated financial statements of Wells Fargo & Company as of
December 31, 1994 and 1993, and for each of the years in the three-year period
ended December 31, 1994, have been incorporated by reference herein and in the
Registration Statement in reliance upon the report of KPMG Peat Marwick LLP,
independent certified public accountants, incorporated by reference herein,
and upon the authority of said firm as experts in accounting and auditing.
 
 
                                      73
<PAGE>
 
                                  SCHEDULE A
 
DIRECTORS AND EXECUTIVE OFFICERS OF THE PURCHASER
 
  The following table sets forth the name, business address and the present
principal occupation or employment, and the name, principal business and
address of any corporation or other organization in which such employment is
carried on, of the directors and executive officers of Wells Fargo.
 
                DIRECTORS AND EXECUTIVE OFFICERS OF WELLS FARGO
 
<TABLE>
<CAPTION>
           NAME AND PRINCIPAL                         PRESENT OFFICE OR OTHER
           BUSINESS ADDRESS*                     PRINCIPAL OCCUPATION OR EMPLOYMENT
- --------------------------------------------  -------------------------------------------
<S>                                           <C>
                                     
H. Jesse Arnelle............................  Director; Senior Partner of Arnelle, Hastie, McGee, 
 Arnelle, Hastie, McGee, Willis & Greene      Willis & Greene 
 1 Market Plaza
 Spear Street Tower, 39th Floor
 San Francisco, California 94105

William R. Breuner..........................  Director; Retired Chairman of the Board of the John 
 The Moraga Professional Center               Breuner Company
 1042 Country Club Drive, Suite 2C
 Moraga, California 94556

William S. Davila...........................  Director; President Emeritus of The Vons
 The Vons Companies, Inc.                     Companies, Inc.
 618 Michillinda Avenue
 Arcadia, California 91007

Rayburn S. Dezember.........................  Director; Retired Chairman of the Board of Central 
 5401 California Avenue                       Pacific Corp.
 Bakersfield, California 93309

Paul Hazen..................................  Chairman of the Board and Chief Executive Officer

Robert K. Jaedicke..........................  Director; Professor (Emeritus) of Accounting and 
 Graduate School of Business,                 Former Dean of the Graduate School of Business, 
 Room 289 Stanford University                 Stanford University
 Stanford, California 94305

Ellen M. Newman.............................  Director; President, Ellen Newman Associates
 Ellen Newman Associates
 323 Geary Street, Suite 507
 San Francisco, California 94102
                                     
Philip J. Quigley...........................  Director; Chairman, President and Chief Executive 
 Pacific Telesis Group                        Officer of Pacific Telesis Group           
 130 Kearney Street, 37th Floor      
 San Francisco, California 94108

Carl E. Reichardt...........................  Director; Retired Chairman of the Board

Donald B. Rice..............................  Director; President and Chief Operating Officer of
 Teledyne, Inc.                               Teledyne, Inc.
 2049 Century Park East, 15th Floor
 Los Angeles, California 90067
</TABLE>
 
                                      A-1
<PAGE>
 
<TABLE>
<CAPTION>
           NAME AND PRINCIPAL                         PRESENT OFFICE OR OTHER
           BUSINESS ADDRESS*                     PRINCIPAL OCCUPATION OR EMPLOYMENT
- --------------------------------------------  -------------------------------------------
<S>                                           <C>
                                    
Susan G. Swenson............................  Director; President and Chief Executive Officer of  
 Cellular One                                 Cellular One
 651 Gateway Boulevard, Suite 1500
 South San Francisco, California 94080
                                    
Chang-Lin Tien..............................  Director; Chancellor of the University of California,  
 Office of the Chancellor                     Berkeley
 200 California Hall
 University of California
 Berkeley, California 94720
John A. Young...............................  Director; Retired President and Chief Executive 
 Hewlett-Packard Company                      Officer of Hewlett-Packard  Company 
 3200 Hillview Avenue              
 Palo Alto, California 94304
William F. Zuendt...........................  Director; President and Chief Operating Officer
Michael J. Gillfillan.......................  Vice Chairman
Charles M. Johnson..........................  Vice Chairman
 2030 Main Street, Suite 900
 Irvine, California 92714
Clyde W. Ostler.............................  Vice Chairman
Rodney L. Jacobs............................  Vice Chairman and Chief Financial Officer
Leslie L. Altick............................  Executive Vice President and Director of Corporate 
 343 Sansome Street                           Communications   
 San Francisco, California 94104  
Patricia R. Callahan........................  Executive Vice President and Personnel Director
Frank A. Moeslein...........................  Executive Vice President and Controller
 343 Sansome Street
 San Francisco, California 94104
Guy Rounsaville, Jr.........................  Executive Vice President, Chief Counsel and
                                              Secretary
Ross J. Kari................................  Executive Vice President and General Auditor
Eric D. Shand...............................  Executive Vice President and Chief Loan Examiner 
 111 Sutter Street                  
 San Francisco, California 94104
</TABLE>
- --------
*  Unless otherwise indicated, the principal business address of each director
   and executive officer is Wells Fargo & Company, 420 Montgomery Street, San
   Francisco, California 94104.
 
                                      A-2
<PAGE>
 
                                  SCHEDULE B
 
              SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW
 
(a) Notwithstanding any other provisions of this chapter, a corporation shall
not engage in any business combination with any interested stockholder for a
period of 3 years following the time that such stockholder became an
interested stockholder, unless:
 
  (1) prior to such time the board of directors of the corporation approved
either the business combination or the transaction which resulted in the
stockholder becoming an interested stockholder, or
 
  (2) upon consummation of the transaction which resulted in the stockholder
becoming an interested stockholder, the interested stockholder owned at least
85% of the voting stock of the corporation outstanding at the time the
transaction commenced, excluding for purposes of determining the number of
shares outstanding those shares owned (i) by persons who are directors and
also officers and (ii) employee stock plans in which employee participants do
not have the right to determine confidentially whether shares held subject to
the plan will be tendered in a tender or exchange offer, or
 
  (3) At or subsequent to such time the business combination is approved by
the board of directors and authorized at an annual or special meeting of
stockholders, and not by written consent, by the affirmative vote of at least
66 2/3% of the outstanding voting stock which is not owned by the interested
stockholder.
 
(b) The restrictions contained in this section shall not apply if:
 
  (1) the corporation's original certificate of incorporation contains a
provision expressly electing not be governed by this section;
 
  (2) the corporation, by action of its board of directors, adopts an
amendment to its bylaws within 90 days of the effective date of this section,
expressly electing not to be governed by this section, which amendment shall
not be further amended by the board of directors;
 
  (3) the corporation, by action of its stockholders, adopts an amendment to
its certificate of incorporation or bylaws expressly electing not to be
governed by this section, provided that, in addition to any other vote
required by law, such amendment to the certificate of incorporation or bylaws
must be approved by the affirmative vote of a majority of the shares entitled
to vote. An amendment adopted pursuant to this paragraph shall be effective
immediately in the case of a corporation that both (i) has never had a class
of voting stock that falls within any of the three categories set out in
subsection (b)(4) hereof, and (ii) has not elected by a provision in its
original certificate of incorporation or any amendment thereto to be governed
by this section. In all other cases, an amendment adopted pursuant to this
paragraph shall not be effective until 12 months after the adoption of such
amendment and shall not apply to any business combination between such
corporation and any person who became an interested stockholder of such
corporation on or prior to such adoption. A bylaw amendment adopted pursuant
to this paragraph shall not be further amended by the board of directors;
 
  (4) the corporation does not have a class of voting stock that is (i) listed
on a national securities exchange, (ii) authorized for quotation on The NASDAQ
Stock Market or (iii) held of record by more than 2,000 stockholders, unless
any of the foregoing results from action taken, directly or indirectly, by an
interested stockholder or from a transaction in which a person becomes an
interested stockholder;
 
  (5) a stockholder becomes an interested stockholder inadvertently and (i) as
soon as practicable divests itself of ownership of sufficient shares so that
the stockholder ceases to be an interested stockholder and (ii) would not, at
any time within the 3 year period immediately prior to a business combination
between the corporation and such stockholder, have been an interested
stockholder but for the inadvertent acquisition of ownership;
 
 
                                      B-1
<PAGE>
 
  (6) the business combination is proposed prior to the consummation or
abandonment of and subsequent to the earlier of the public announcement or the
notice required hereunder of a proposed transaction which (i) constitutes one
of the transactions described in the second sentence of this paragraph; (ii)
is with or by a person who either was not an interested stockholder during the
previous 3 years or who became an interested stockholder with the approval of
the corporation's board of directors or during the period described in
paragraph (7) of this subsection (b); and (iii) is approved or not opposed by
a majority of the members of the board of directors then in office (but not
less than 1) who were directors prior to any person becoming an interested
stockholder during the previous 3 years or were recommended for election or
elected to succeed such directors by a majority of such directors. The
proposed transactions referred to in the preceding sentence are limited to (x)
a merger or consolidation of the corporation (except for a merger in respect
of which, pursuant to section 251(f) of the chapter, no vote of the
stockholders of the corporation is required); (y) a sale, lease, exchange,
mortgage, pledge, transfer or other disposition (in one transaction or a
series of transactions), whether as a part of a dissolution or otherwise, of
assets of the corporation or of any direct or indirect majority-owned
subsidiary of the corporation (other than to any direct or indirect wholly-
owned subsidiary or to the corporation) having an aggregate market value equal
to 50% or more of either that aggregate market value of all of the assets of
the corporation determined on a consolidated basis or the aggregate market
value of all the outstanding stock of the corporation; or (z) a proposed
tender or exchange offer for 50% or more of the outstanding voting stock of
the corporation. The corporation shall give not less than 20 days notice to
all interested stockholders prior to the consummation of any of the
transactions described in clauses (x) or (y) of the second sentence of this
paragraph; or
 
  (7) The business combination is with an interested stockholder who became an
interested stockholder at a time when the restrictions contained in this
section did not apply by reason of any paragraphs (1) through (4) of this
subsection (b), provided, however, that this paragraph (7) shall not apply if,
at the time such interested stockholder became an interested stockholder, the
corporation's certificate of incorporation contained a provision authorized by
the last sentence of this subsection (b).
 
  Notwithstanding paragraphs (1), (2), (3) and (4) of this subsection, a
corporation may elect by a provision of its original certificate of
incorporation or any amendment thereto to be governed by this section;
provided that any such amendment to the certificate of incorporation shall not
apply to restrict a business combination between the corporation and an
interested stockholder of the corporation if the interested stockholder became
such prior to the effective date of the amendment.
 
(c) As used in this section only, the term:
 
  (1) "affiliate" means a person that directly, or indirectly through one or
more intermediaries, controls, or in controlled by, or is under common control
with, another person.
 
  (2) "associate," when used to indicate a relationship with any person, means
(i) any corporation, partnership, unincorporated association or other entity
of which such person is a director, officer or partner or is, directly or
indirectly, the owner of 20% or more of any class of voting stock, (ii) any
trust or other estate in which such person has at least a 20% beneficial
interest or as to which such person serves as trustee or in a similar
fiduciary capacity, and (iii) any relative or spouse of such person, or any
relative of such spouse, who has the same residence as such person.
 
  (3) "business combination," when used in reference to any corporation and
any interested stockholder of such corporation, means:
 
    (i) any merger or consolidation of the corporation or any direct or
  indirect majority-owned subsidiary of the corporation with (A) the
  interested stockholder, or (B) with any other corporation, partnership,
  unincorporated association or other entity if the merger or consolidation
  is caused by the interested stockholder and as a result of such merger or
  consolidation subsection (a) of this section is not applicable to the
  surviving entity;
 
 
                                      B-2
<PAGE>
 
    (ii) any sale, lease, exchange, mortgage, pledge, transfer or other
  disposition (in one transaction or a series of transactions), except
  proportionately as a stockholder of such corporation, to or with the
  interested stockholder, whether as part of a dissolution or otherwise, of
  assets of the corporation or of any direct or indirect majority-owned
  subsidiary of the corporation which assets have an aggregate market value
  equal to 10% or more of either the aggregate market value of all the assets
  of the corporation determined on a consolidated basis or the aggregate
  market value of all the outstanding stock of the corporation;
 
    (iii) any transaction which results in the issuance or transfer by the
  corporation or by any direct or indirect majority-owned subsidiary of the
  corporation of any stock of the corporation or of such subsidiary to the
  interested stockholder, except (A) pursuant to the exercise, exchange or
  conversion of securities exercisable for, exchangeable for or convertible
  into stock of such corporation or any such subsidiary which securities were
  outstanding prior to the time that the interested stockholder became such,
  (B) pursuant to a merger under Section 251(g) of this title; (C) pursuant
  to a dividend to a dividend or distribution paid or made, or the exercise,
  exchange or conversion of securities exercisable for, exchangeable for or
  convertible into stock of such corporation or any such subsidiary which
  security is distributed, pro rata to all holders of a class or series of
  stock of such corporation subsequent to the time the interested stockholder
  became such, (D) pursuant to an exchange offer by the corporation to
  purchase stock made on the same terms to all holders of said stock, or (E)
  any issuance or transfer of stock by the corporation, provided however,
  that in no case under (C)-(E) above shall there be an increase in the
  interested stockholder's proportionate share of the stock of any class or
  series of the corporation or of the voting stock of the corporation;
 
    (iv) any transaction involving the corporation or any direct or indirect
  majority-owned subsidiary of the corporation which has the effect, directly
  or indirectly, of increasing the proportionate share of the stock of any
  class or series, or securities convertible into the stock of any class or
  series, of the corporation or of any such subsidiary which is owned by the
  interested stockholder, except as a result of immaterial changes due to
  fractional share adjustments or as a result of any purchase or redemption
  of any shares of stock not caused, directly or indirectly, by the
  interested stockholder; or
 
    (v) any receipt by the interested stockholder of the benefit, directly or
  indirectly (except proportionately as a stockholder of such corporation) of
  any loans, advances, guarantees, pledges, or other financial benefits
  (other than those expressly permitted in subparagraphs (i)-(iv) above)
  provided by or through the corporation or any direct or indirect majority
  owned subsidiary.
 
  (4) "control," including the term "controlling," "controlled by" and "under
common control with," means the possession, directly or indirectly, of the
power to direct or cause the direction of the management and policies of a
person, whether through the ownership of voting stock, by contract, or
otherwise. A person who is the owner of 20% or more of the outstanding voting
stock of any corporation, partnership, unincorporated association or other
entity shall be presumed to have control of such entity, in the absence of
proof by a preponderance of the evidence to the contrary. Notwithstanding the
foregoing, a presumption of control shall not apply where such person holds
voting stock, in good faith and not for the purpose of circumventing this
section, as an agent, bank, broker, nominee, custodian or trustee for one or
more owners who do not individually or as a group have control of such entity.
 
  (5) "interested stockholder" means any person (other than the corporation
and any direct or indirect majority-owned subsidiary of the corporation) that
(i) is the owner of 15% or more of the outstanding voting stock of the
corporation, or (ii) is an affiliate or associate of the corporation and was
the owner of 15% or more of the outstanding voting stock of the corporation at
any time within the 3-year period immediately prior to the date on which it is
sought to be determined whether such person is an interested stockholder; and
the affiliates and associates of such person; provided, however, that the term
"interested stockholder" shall not include (x) any person who (A) owned shares
in excess of the 15% limitation set forth herein as of, or acquired such
shares pursuant to a tender offer commenced prior to, December 23, 1987, or
pursuant to an exchange offer announced prior to the aforesaid date and
commenced within 90 days thereafter and either (I) continued to own shares in
 
                                      B-3
<PAGE>
 
excess of such 15% limitation or would have but for action by the corporation
or (II) is an affiliate or associate of the corporation and so continued (or
so would have continued but for action by the corporation) to be the owner of
15% or more of the outstanding voting stock of the corporation at any time
within the 3-year period immediately prior to the date on which it is sought
to be determined whether such a person is an interested stockholder or (B)
acquired said shares from a person described in (A) above by gift, inheritance
or in a transaction in which no consideration was exchanged; or (y) any person
whose ownership of shares in excess of the 15% limitation set forth herein in
the result of action taken solely by the corporation provided that such person
shall be an interested stockholder if thereafter such person acquires
additional shares of voting stock of the corporation, except as a result of
further corporate action not caused, directly or indirectly, by such person.
For the purpose of determining whether a person is an interested stockholder,
the voting stock of the corporation deemed to be outstanding shall include
stock deemed to be owned by the person through application of paragraph (8) of
this subsection but shall not include any other unissued stock of such
corporation which may be issuable pursuant to any agreement, arrangement or
understanding, or upon exercise of conversion rights, warrants or options, or
otherwise.
 
  (6) "person" means any individual, corporation, partnership, unincorporated
association or other entity.
 
  (7) "Stock" means, with respect to any corporation, capital stock and, with
respect to any other entity, any equity interest.
 
  (8) "Voting stock" means, with respect to any corporation, stock of any
class or series entitled to vote generally in the election of directors and,
with respect to any entity that is not a corporation, any equity interest
entitled to vote generally in the election of the governing body of such
entity.
 
  (9) "owner" including the terms "own" and "owned" when used with respect to
any stock means a person that individually or with or through any of its
affiliates or associates:
 
    (i) beneficially owns such stock, directly or indirectly; or
 
    (ii) has (A) the right to acquire such stock (whether such right is
  exercisable immediately or only after the passage of time) pursuant to any
  agreement, arrangement or understanding, or upon the exercise of conversion
  rights, exchange rights, warrants or options, or otherwise; provided,
  however, that a person shall not be deemed the owner of stock tendered
  pursuant to a tender or exchange offer made by such person or any of such
  person's affiliates or associates until such tendered stock is accepted for
  purchase or exchange; or (B) the right to vote such stock pursuant to any
  agreement, arrangement or understanding; provided, however, that a person
  shall not be deemed the owner of any stock because of such person's right
  to vote such stock if the agreement, arrangement or understanding to vote
  such stock arises solely from a revocable proxy or consent given in
  response to a proxy or consent solicitation made to 10 or more persons; or
 
    (iii) has any agreement, arrangement or understanding for the purpose of
  acquiring, holding, voting (except voting pursuant to a revocable proxy or
  consent as described in item (B) of clause (ii) of this paragraph), or
  disposing of such stock with any other person that beneficially owns, or
  whose affiliates or associates beneficially own, directly or indirectly,
  such stock.
 
(d) No provision of a certificate of incorporation or bylaw shall require, for
any vote of stockholders required by this section a greater vote of
stockholders than that specified in this section.
 
(e) The Court of Chancery is hereby vested with exclusive jurisdiction to hear
and determine all matters with respect to this section. (Last amended by Ch.
79, L. '95, eff. 7-1-95.)
 
 
                                      B-4
<PAGE>
 
  Manually signed facsimile copies of the Letter of Transmittal will be
accepted. The Letter of Transmittal, certificates for Shares and Rights and
any other required documents should be sent or delivered by each stockholder
of the Company or his broker, dealer, commercial bank, trust company or other
nominee to the Exchange Agent at one of its addresses set forth below.
 
                              THE EXCHANGE AGENT:
                                 [Insert Name]
 
                               TELEPHONE NUMBER:
                                    [     ]
                                (call collect)
 
   By Mail: [To Come]       Facsimile Transmission         By Hand or
                                 Copy Numbers:         Overnight Courier:
                                    [    ]                  [To Come]
                                    [    ]
 
 
                        Confirm Facsimile by Telephone:
                                    [    ]
                                    [    ]
 
  Any questions or requests for assistance or additional copies of the
Prospectus, the Letter of Transmittal and the Notice of Guaranteed Delivery
may be directed to the Information Agent or the Dealer Manager[s] at their
respective telephone numbers and locations listed below. You may also contact
your local broker, commercial bank, trust company or nominee for assistance
concerning the Offer.
 
                    The Information Agent for the Offer is:
 
                             D.F. KING & CO., INC.
 
                         77 Water Street, 20th Floor 
                           New York, New York 10005 
                Banks and Brokers Call Collect: (212) 269-5550 
                   All Others Call Toll-Free: 1-800-431-9646
 
                The Dealer Manager[s] for the Offer [is] [are]:
 
                                   [To Come]
<PAGE>
 
                                    PART II
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  As permitted by Section 102(b)(7) of the DGCL, Article Fifth of the Wells
Fargo Certificate (Exhibit 3.1 hereto) eliminates the monetary liability of a
director to the corporation or its stockholders for breach of fiduciary duty
as a director, with the following exceptions, as required by Delaware law: (i)
breach of the director's duty of loyalty to the corporation or its
stockholders; (ii) acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law; (iii) payment of
unlawful dividends or the making of unlawful stock purchases or redemptions;
or (iv) any transaction from which the director derived an improper personal
benefit.
 
  In addition, under Section 145 of the DGCL, a corporation may indemnify a
director, officer, employee or agent of the corporation against expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by him in connection with any threatened,
pending or completed Proceeding (other than an action by or in the right of
the corporation) if he acted in good faith and in a manner which he reasonably
believed to be in or not opposed to the best interests of the corporation and,
with respect to any criminal action or proceeding, had no reasonable cause to
believe his conduct was unlawful. In the case of an action brought by or in
the right of the corporation, the corporation may indemnify a director,
officer, employee or agent of the corporation against expenses (including
attorneys' fees) actually and reasonably incurred by him in connection with
the defense or settlement of any threatened, pending or completed action or
suit if he acted in good faith and in a manner he reasonably believed to be in
or not opposed to the best interests of the corporation, except that no
indemnification shall be made in respect of any claim, issue or matter as to
which such person shall have been adjudged to be liable to the corporation
unless and only to the extent that a court determines upon application that,
in view of all the circumstances of the case, such person is fairly and
reasonably entitled to indemnity for such expenses as the court deems proper.
Article IV of the Wells Fargo By-laws (Exhibit 3.2 hereto) provides for
indemnification of its directors, officers, employees, and other agents to the
fullest extent permitted by the DGCL.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULE
 
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                 DESCRIPTION
 -------                               -----------
 <C>     <S>
  3.1    Restated Certificate of Incorporation of the Registrant dated March 3,
         1987 (filed as Exhibit 3(a) to the Registrant's Annual Report on Form
         10-K for the year ended December 31, 1993).*
  3.2    Bylaws of the Registrant, as amended April 18, 1995 (filed as Exhibit
         3(ii) to the Registrant's Annual Report on Form 10-K for the year
         ended December 31, 1993).*
  3.3    Certificate of the Voting Powers, Designation, Preferences and
         Relative Participating, Optional or Other Special Rights, and the
         Qualifications, Limitations or Restrictions Thereof, Which Have Not
         Been Set Forth in the Certificate of Incorporation or in Any Amendment
         Thereto, of the Adjustable Rate Cumulative Preferred Stock, Series B
         (filed as Exhibit 3(c) to the Registrant's Annual Report on Form 10-K
         for the year ended December 31, 1993).*
  3.4    Certificate of the Voting Powers, Designation, Preferences and
         Relative Participating, Optional or Other Special Rights, and the
         Qualifications, Limitations or Restrictions Thereof, Which Have Not
         Been Set Forth in the Certificate of Incorporation or in Any Amendment
         Thereto, of the 9% Preferred Stock, Series C (filed as Exhibit 3 to
         the Registrant's Current Report on Form 8-K dated October 24, 1991).*
  3.5    Certificate of the Voting Powers, Designation, Preferences and
         Relative Participating, Optional or Other Special Rights, and the
         Qualifications, Limitations or Restrictions Thereof, Which Have Not
         Been Set Forth in the Certificate of Incorporation or in Any Amendment
         Thereto, of the 8 7/8% Preferred Stock, Series D (filed as Exhibit 3
         to the Registrant's Current Report on Form 8-K dated March 5, 1992).*
</TABLE>
 
 
                                     II-1
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                 DESCRIPTION
 -------                               -----------
 <C>     <S>
  5.1    Opinion of Sullivan & Cromwell.**
  8.1    Tax opinion of Sullivan & Cromwell.**
 21.1    Subsidiaries of the Registrant (filed as Exhibits 21 and 22 to the
         Registrant's Annual Report on Form 10-K for the year ended December
         31, 1994).*
 23.1    Consent of KPMG Peat Marwick LLP.
 23.2    Consent of Sullivan & Cromwell (included in Exhibit 5.1).**
 23.3    Consent of Sullivan & Cromwell (included in Exhibit 8.1).**
 24.1    Powers of Attorney (See page II-4).
 99.1    Form of Letter of Transmittal.**
 99.2    Form of Letter of Transmittal Supplement.**
 99.3    Form of Notice of Guaranteed Delivery.**
 99.4    Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies
         and Other Nominees.**
 99.5    Form of Letter to Clients for use by Brokers, Dealers, Commercial
         Banks, Trust Companies and Other Nominees.**
 99.6    Form of Guidelines for Certification of Taxpayer Identification Number
         on Substitute Form W-9.**
 99.7    Summary Advertisement.**
</TABLE>
- --------
*  Incorporated by reference.
** To be filed by amendment.
 
ITEM 22. UNDERTAKINGS
 
  The Undersigned Registrant hereby undertakes:
 
  (1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
 
    (i) to include any prospectus required by Section 10(a)(3) of the
  Securities Act 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 post-
  effective amendment thereof) which, individually or in the aggregate,
  represent a fundamental change in the information set forth in the
  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 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.
 
  (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of
the offering.
 
  The undersigned Registrant hereby undertakes that, for the purpose 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
 
                                     II-2
<PAGE>
 
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.
 
  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 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.
 
  The undersigned registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the prospectus pursuant to
Items 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.
 
  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-3
<PAGE>
 
                                  SIGNATURES
 
  Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant has duly caused this Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City and County
of San Francisco, State of California on November 27, 1995.
 
                                     WELLS FARGO & COMPANY
 

                                     By           /s/ Rodney L. Jacobs
                                       -----------------------------------------
                                                    Rodney L. Jacobs 
                                       Vice Chairman and Chief Financial Officer
 
  Each person whose signature appears below appoints Paul Hazen, William F.
Zuendt, and Rodney L. Jacobs and each of them, any of whom may act without the
joinder of the other, as his or her true and lawful attorneys-in-fact and
agents, with full power of substitution and resubstitution, for him or her and
in his or her name, place and stead, in any and all capacities to sign any and
all amendments (including post-effective amendments) to this Registration
Statement and to file the same, with all exhibits thereto and all other
documents in connection therewith, with the Securities and Exchange
Commission, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite and
necessary to be done, as fully to all intents and purposes as he or she might
or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or their substitute or substitutes may lawfully
do or cause to be done by virtue hereof.
 
  Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
              SIGNATURE                              TITLE                      DATE
              ---------                              -----                      ----
<S>                                    <C>                                <C>
                           
            /s/ Paul Hazen             Chairman of the Board, Chief       November 27, 1995
______________________________________  Executive Officer and Director
              Paul Hazen                (Principal Executive Officer)
                              

         /s/ Rodney L. Jacobs          Vice Chairman and Chief            November 27, 1995
______________________________________  Financial Officer (Principal
           Rodney L. Jacobs             Financial Officer)
                              

        /s/ Frank A. Moeslein          Executive Vice President and       November 27, 1995
______________________________________  Controller (Principal
          Frank A. Moeslein             Accounting Officer)


         /s/ H. Jesse Arnelle
______________________________________ Director                           November 27, 1995
           H. Jesse Arnelle


        /s/ William R. Breuner
______________________________________ Director                           November 27, 1995
          William R. Breuner


        /s/ William S. Davila
______________________________________ Director                           November 27, 1995
          William S. Davila
</TABLE>
 
 
                                     II-4
<PAGE>
 
<TABLE>
<CAPTION>
              SIGNATURE                              TITLE                      DATE
              ---------                              -----                      ----
<S>                                    <C>                                <C>

       /s/ Rayburn S. Dezember
______________________________________ Director                           November 27, 1995
         Rayburn S. Dezember


        /s/ Robert K. Jaedicke
______________________________________ Director                           November 27, 1995
          Robert K. Jaedicke


         /s/ Ellen M. Newman
______________________________________ Director                           November 27, 1995
           Ellen M. Newman


        /s/ Philip J. Quigley
______________________________________ Director                           November 27, 1995
          Philip J. Quigley


        /s/ Carl E. Reichardt
______________________________________ Director                           November 27, 1995
          Carl E. Reichardt


          /s/ Donald B. Rice
______________________________________ Director                           November 27, 1995
            Donald B. Rice


         /s/ Susan G. Swenson
______________________________________ Director                           November 27, 1995
           Susan G. Swenson


          /s/ Chang-Lin Tien
______________________________________ Director                           November 27, 1995
            Chang-Lin Tien


          /s/ John A. Young
______________________________________ Director                           November 27, 1995
            John A. Young


        /s/ William F. Zuendt
______________________________________ Director                           November 27, 1995
          William F. Zuendt
</TABLE>
 
                                      II-5
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
 EXHIBIT                                                                   PAGE
   NO.                             DESCRIPTION                             NO.
 -------                           -----------                             ----
 <C>     <S>                                                               <C>
  5.1    Opinion of Sullivan & Cromwell.**
  8.1    Tax opinion of Sullivan & Cromwell.**
 21.1    Subsidiaries of the Registrant (filed as Exhibits 21 and 22 to
         the Registrant's Annual Report on Form 10-K for the year ended
         December 31, 1994).*
 23.1    Consent of KPMG Peat Marwick LLP.
 23.2    Consent of Sullivan & Cromwell (included in Exhibit 5.1).**
 23.3    Consent of Sullivan & Cromwell (included in Exhibit 8.1).**
 24.1    Powers of Attorney (See page II-4).
 99.1    Form of Letter of Transmittal.**
 99.2    Form of Letter of Transmittal Supplement.**
 99.3    Form of Notice of Guaranteed Delivery.**
 99.4    Form of Letter to Brokers, Dealers, Commercial Banks, Trust
         Companies and Other Nominees.**
 99.5    Form of Letter to Clients for use by Brokers, Dealers,
         Commercial Banks, Trust Companies and Other Nominees.**
 99.6    Form of Guidelines for Certification of Taxpayer Identification
         Number on Substitute Form
         W-9.**
 99.7    Summary Advertisement.**
</TABLE>
- --------
*  Incorporated by reference.
** To be filed by amendment.
<PAGE>
 
                                                                   EXHIBIT 23.1
 
                       CONSENT OF KPMG PEAT MARWICK LLP
 
The Board of Directors 
Wells Fargo & Company:
 
 We consent to the incorporation by reference in the Registration Statement on
Form S-4 (No. 33-   ) of Wells Fargo & Company of our report dated January 17,
1995, incorporated by reference in the Annual Report on Form 10-K of Wells
Fargo & Company for the year ended December 31, 1994 and to the reference to
our firm under the heading "Experts" in the Prospectus.
 
                                          /s/ KPMG Peat Marwick LLP
 
San Francisco, CA 
November 27, 1995


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