WELLS FARGO & CO
PRRN14A, 1996-01-16
NATIONAL COMMERCIAL BANKS
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                                  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:
 
[X] Preliminary Proxy Statement          [_] Confidential, for Use of the
                                             Commission Only (as permitted by
                                             Rule 14a-6(e)(2))
 
[_] Definitive Proxy Statement
 
[_] Definitive Additional Materials
 
[_] 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, IF OTHER THAN THE REGISTRANT)
 
Payment of Filing Fee (Check the appropriate box):
 
[_] $125 per Exchange Act Rule 0-11(c)(1)(ii), 14a-6(i)(1), or 14a-6(i)(2) or
    Item 22(a)(2) of Schedule 14A.
 
[_] $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:
 
[X] 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:
 
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<PAGE>
 
        
     PRELIMINARY COPY--SUBJECT TO COMPLETION, DATED JANUARY 16, 1996     
 
                                    [LOGO]
       
                                                                         , 1996
   
Dear First Interstate Stockholders:     
 
  As you probably know by now, Wells Fargo is offering to acquire First
Interstate in a tax-free exchange of two-thirds of a share of Wells Fargo
common stock for each share of First Interstate common stock.
 
  First Interstate's board, which collectively owns less than 1% of the common
stock of First Interstate, has rejected that exchange offer and, by
maintaining obstacles to its completion, has refused to let you--the
stockholders of First Interstate--realize its benefits. Instead, they are
intent on pursuing a merger with First Bank System ("FBS"), even though in our
view that merger offers you considerably less value.
 
                      DO NOT SUPPORT AN INFERIOR PROPOSAL
   
  .  At all times since the competing proposals were announced, the Wells Fargo
     proposal has produced a substantially higher market value per First
     Interstate share than has the FBS proposal--a $19.35 per share premium,
     or an aggregate of approximately $1.5 billion in excess of the FBS
     proposal, based on closing prices on January 15, 1996. This is true even
     though Wells Fargo believes the market has significantly discounted its
     shares since October 18, 1995 due to uncertainty over whether Wells Fargo
     will succeed in eliminating the obstacles to its exchange offer being
     maintained by the First Interstate board.     
 
  .  The First Interstate board has attempted to justify its endorsement of the
     lower market value FBS proposal on the basis of various financial reasons
     which Wells Fargo believes are subject to serious question.
 
  .  In an extraordinary and perhaps unprecedented action, one of First
     Interstate's own financial advisors included in its fairness opinion
     relating to the FBS proposal an additional opinion that the original
     Wells Fargo proposal to merge with First Interstate (at an exchange ratio
     of 0.625, or approximately $8 to $9 per share lower than the value
     produced by the current Wells Fargo offer with an exchange ratio of two-
     thirds) was fair from a financial point of view to First Interstate
     stockholders. The other First Interstate financial advisor explicitly
     qualified its fairness opinion by stating that it was not passing on the
     relative merits of the competing proposals and by assuming that the
     FIB/FBS Merger is of long-term strategic importance to First Interstate
     solely on the basis of being so informed by the First Interstate board.
 
  Now the First Interstate board is soliciting your vote for the FBS merger at
a meeting scheduled to be held on            , 1996, despite the higher market
value of the Wells Fargo proposal and the case laid out in the attached Proxy
Statement that the Wells Fargo exchange offer is superior.
 
                      PRESERVE YOUR OPPORTUNITY TO ACCEPT
                 THE OFFER PROVIDING THE HIGHEST MARKET VALUE;
                          VOTE AGAINST THE FBS MERGER
 
  Wells Fargo cannot complete its exchange offer if the First Interstate
stockholders approve the FBS merger. Thus, Wells Fargo urges you to vote
against the FBS merger and preserve your opportunity to accept the higher
market value Wells Fargo offer. If stockholders vote down the FBS merger:
 
  . We believe First Interstate's board will respect your vote, remove the
    obstacles it is maintaining to the completion of the Wells Fargo exchange
    offer (e.g., the First Interstate "poison pill" rights plan) and allow
<PAGE>
 
    that offer to proceed. After all, as stated above, one of First
    Interstate's own financial advisors has already opined that the original
    Wells Fargo proposal was fair from a financial point of view to the First
    Interstate stockholders.
 
  . Even if the First Interstate board remains intransigent and ignores your
    views, First Interstate stockholders will still have the last word: Wells
    Fargo intends (if necessary) to proceed with a solicitation of written
    consents from stockholders to replace the First Interstate board with
    nominees committed to removing all obstacles to the completion of the
    Wells Fargo exchange offer.
 
  . In any event, Wells Fargo will continue to pursue its current litigation
    intended to force the First Interstate board to honor its fiduciary duties
    and remove the obstacles it is maintaining to a combination with Wells
    Fargo.
 
                 WE SEE NO TIME ADVANTAGE TO THE FBS PROPOSAL
   
  The competing proposals are subject to obtaining virtually identical
regulatory approvals. Wells Fargo is confident that it will be able to obtain
the necessary regulatory approvals for its exchange offer on a timely basis
and in a time frame substantially identical to that in which FBS would be able
to obtain the necessary regulatory approvals for its proposed merger.
Accordingly, Wells Fargo is convinced that the FBS proposal offers no timing
advantage over the Wells Fargo exchange offer. First Interstate stockholders
should thus focus solely on the economics of the competing proposals. On this
basis, Wells Fargo believes its exchange offer is clearly superior.     
 
                            YOUR VOTE IS ESSENTIAL
 
  IF YOU WANT THE WELLS FARGO OFFER TO SUCCEED, VOTE AGAINST THE FBS PROPOSAL
BY SIGNING, DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD TODAY.
 
                                       Sincerely,
 
                                       [Signature--To Come]
 
                                       Paul Hazen
                                          
                                       Chairman of the Board and Chief
                                        Executive Officer     
 
 
                                   IMPORTANT
   
  Only stockholders of record on January 10, 1996 are entitled to
vote.     
 
  1. If your shares are held in your own name, please sign, date and
     return the enclosed WHITE proxy card in the postage-paid envelope
     provided. If your shares are held in the name of a brokerage firm,
     bank or other institution, please sign, date and return the WHITE
     proxy card to such brokerage firm, bank or other institution in the
     envelope provided by that firm.
 
  2. Please be sure your latest dated proxy is a WHITE card voting
     AGAINST the FBS proposal. If you have already voted for the FBS
     proposal on First Interstate's [color] proxy card, it is not too
     late to change your vote; simply sign, date and return the WHITE
     proxy card. Only your latest dated proxy will be counted.
 
  If you have any questions or require any assistance in voting your shares,
please call:
 
                             D.F. KING & CO., INC.
 
                          77 WATER STREET, 20TH FLOOR
                           NEW YORK, NEW YORK 10005
               BANKERS AND BROKERS CALL COLLECT: (212) 269-5550
                   ALL OTHERS CALL TOLL-FREE: 1-800-431-9646
 
<PAGE>
 
        
     PRELIMINARY COPY--SUBJECT TO COMPLETION, DATED JANUARY 16, 1996     
 
                        SPECIAL MEETING OF STOCKHOLDERS
                                      OF
                           FIRST INTERSTATE BANCORP
 
                               ----------------
 
                     RELATING TO THE PROPOSED MERGER WITH
                            FIRST BANK SYSTEM, INC.
 
                               ----------------
 
                                PROXY STATEMENT
                                      OF
                             WELLS FARGO & COMPANY
   
  This Proxy Statement is furnished by Wells Fargo & Company ("Wells Fargo")
in connection with its solicitation of proxies to be used at a special meeting
of stockholders of First Interstate Bancorp ("First Interstate") to be held on
         , 1996 at       , at    a.m. local time, and at any adjournments,
postponements or reschedulings thereof (the "Special Meeting"). At the Special
Meeting, the holders of shares of common stock of First Interstate (the
"Shares") of record on January 10, 1996 ("Stockholders") will be voting on
whether to approve and adopt the Agreement and Plan of Merger, dated as of
November 5, 1995, by and among First Bank System, Inc. ("FBS"), Eleven
Acquisition Corp., a subsidiary of FBS ("FBS Sub"), and First Interstate (the
"FIB/FBS Merger Agreement") relating to a proposed merger between First
Interstate and FBS Sub (the "FIB/FBS Merger"). This Proxy Statement is first
being mailed to Stockholders on or about         , 1996.     
   
  On             , 1996, Wells Fargo commenced an offer (the "Wells Fargo
Offer") to exchange two-thirds of a share of Wells Fargo common stock ("Wells
Fargo Common Stock") for each Share. Wells Fargo intends, as soon as
practicable after consummation of the Wells Fargo Offer, to seek to acquire
the remaining Shares pursuant to a merger with First Interstate (the "Wells
Fargo Merger" and, together with the Wells Fargo Offer, the "Wells Fargo
Acquisition") in which each outstanding Share not acquired by Wells Fargo
pursuant to the Wells Fargo Offer would be converted into the right to receive
two-thirds of a share of Wells Fargo Common Stock. The Wells Fargo Offer by
its terms will expire on               , 1996, but Wells Fargo currently
intends to extend such offer from time to time until all conditions thereto
have been satisfied or waived. The Wells Fargo Offer is being made solely
pursuant to Wells Fargo's prospectus dated               , 1996 (the "Wells
Fargo Prospectus" and, in the preliminary form dated January 16, 1996, the
"Wells Fargo Preliminary Prospectus") and the related Letter of Transmittal
which have been separately mailed to Stockholders. For additional information
concerning the Wells Fargo Offer and the FIB/FBS Merger, see the Wells Fargo
Preliminary Prospectus.     
 
  The Board of Directors of First Interstate (the "First Interstate Board"),
which collectively owns less than 1% of the outstanding Shares, has rejected
the Wells Fargo Offer and, by maintaining obstacles to its completion, has
refused to let the First Interstate Stockholders realize its benefits.
Instead, the First Interstate Board is intent on pursuing the FIB/FBS Merger,
even though in Wells Fargo's view that merger offers Stockholders considerably
less value.
 
  THE PURPOSE OF THE SOLICITATION MADE BY THIS PROXY STATEMENT (THE "PROXY
SOLICITATION") IS TO ENABLE FIRST INTERSTATE'S STOCKHOLDERS TO DECIDE FOR
THEMSELVES WHICH PROPOSAL IS SUPERIOR AND TO ACT ACCORDINGLY.
<PAGE>
 
  WELLS FARGO URGES YOU TO VOTE AGAINST THE FIB/FBS MERGER AGREEMENT AND
PRESERVE YOUR OPPORTUNITY TO ACCEPT THE HIGHER MARKET VALUE WELLS FARGO OFFER.
IF YOU WANT THE WELLS FARGO OFFER TO SUCCEED, VOTE AGAINST THE FIB/FBS MERGER
AGREEMENT BY SIGNING, DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD
TODAY.
 
 
                                  IMPORTANT
    
 Only Stockholders of record on January 10, 1996 (the "Record Date") are
 entitled to vote.     
 
 1. If your Shares are held in your own name, please sign, date and return
    the enclosed WHITE proxy card in the postage-paid envelope provided. If
    your shares are held in the name of a brokerage firm, bank or other
    institution, please sign, date and return the WHITE proxy card to such
    brokerage firm, bank or other institution in the envelope provided by
    that firm.
 
 2. Please be sure your latest dated proxy is a WHITE card voting AGAINST
    the FBS proposal. If you have already voted for the FBS proposal on
    First Interstate's [color] proxy card, it is not too late to change
    your vote; simply sign, date and return the WHITE proxy card. Only your
    latest dated proxy will be counted.
 
 If you have any questions or require any assistance in voting your Shares,
 please call:
 
                             D.F. KING & CO., INC.
 
                          77 WATER STREET, 20TH FLOOR
                           NEW YORK, NEW YORK 10005
               BANKERS AND BROKERS CALL COLLECT: (212) 269-5550
                   ALL OTHERS CALL TOLL-FREE: 1-800-431-9646
 
 
                                       2
<PAGE>
 
                                 INTRODUCTION
 
  On             , 1996, Wells Fargo commenced an offer (the Wells Fargo
Offer) to exchange two-thirds of a share of Wells Fargo Common Stock for each
Share. Wells Fargo intends, as soon as practicable after consummation of the
Wells Fargo Offer, to seek to acquire the remaining Shares pursuant to a
merger with First Interstate (the Wells Fargo Merger) in which each
outstanding Share not acquired by Wells Fargo pursuant to the Wells Fargo
Offer would be converted into the right to receive two-thirds of a share of
Wells Fargo Common Stock. The Wells Fargo Offer by its terms will expire on
     , 1996, but Wells Fargo currently intends to extend such offer from time
to time until all conditions thereto have been satisfied or waived. The Wells
Fargo Offer is being made solely pursuant to the Wells Fargo Prospectus and
the related Letter of Transmittal which have been separately mailed to
Stockholders. For additional information concerning the Wells Fargo Offer and
the FIB/FBS Merger, see the Wells Fargo Preliminary Prospectus.
 
  The First Interstate Board, which collectively owns less than 1% of the
outstanding Shares, has rejected the Wells Fargo Offer and, by maintaining
obstacles to its completion, has refused to let the First Interstate
Stockholders realize its benefits. Instead, the First Interstate Board is
intent on pursuing the FIB/FBS Merger, even though in Wells Fargo's view that
merger offers Stockholders considerably less value. See "Comparison of the Two
Proposals" below.
     
  . At all times since the competing proposals were announced, the Wells
    Fargo Offer has produced a substantially higher market value per Share
    than has the FIB/FBS Merger proposal --a $19.35 per Share premium, or an
    aggregate of approximately $1.5 billion in excess of the FBS proposal,
    based on closing prices on the last trading day before the date of this
    preliminary proxy statement. See "Comparison of the Two Proposals--Market
    Value" below. This is true even though Wells Fargo believes the market
    has significantly discounted its shares since October 18, 1995 due to
    uncertainty over whether Wells Fargo will succeed in eliminating the
    obstacles to its exchange offer being maintained by the First Interstate
    Board.     
 
  . The First Interstate Board has attempted to justify its endorsement of
    the lower market value FIB/FBS Merger proposal on the basis of various
    financial reasons which Wells Fargo believes are subject to serious
    question. See "Comparison of the Two Proposals--Other Considerations
    Affecting Value" below.
 
  . In an extraordinary and perhaps unprecedented action, one of First
    Interstate's own financial advisors included in its fairness opinion
    relating to the FIB/FBS Merger proposal an additional opinion that the
    original Wells Fargo proposal to merge with First Interstate (at an
    exchange ratio of 0.625, or approximately $8 to $9 per share lower than
    the value produced by the current Wells Fargo Offer with an exchange
    ratio of two-thirds) was fair from a financial point of view to the First
    Interstate Stockholders. The other First Interstate financial advisor
    explicitly qualified its fairness opinion by stating that it was not
    passing on the relative merits of the competing proposals and by assuming
    that the FIB/FBS Merger is of long-term strategic importance to First
    Interstate solely on the basis of being so informed by the First
    Interstate board.
 
  THE PURPOSE OF THIS PROXY SOLICITATION IS TO ENABLE FIRST INTERSTATE'S
STOCKHOLDERS TO DECIDE FOR THEMSELVES WHICH PROPOSAL IS SUPERIOR AND TO ACT
ACCORDINGLY.
 
  Wells Fargo cannot complete the Wells Fargo Offer if the First Interstate
Stockholders approve the FIB/FBS Merger Agreement. Thus, Wells Fargo urges
Stockholders to vote against the FIB/FBS Merger Agreement and preserve the
Stockholders opportunity to accept the higher value Wells Fargo Offer. If
Stockholders do not approve and adopt the FIB/FBS Merger Agreement, Wells
Fargo believes the First Interstate Board will respect the Stockholders' vote,
remove the obstacles it is maintaining to the completion of the Wells Fargo
Offer (e.g., the First Interstate "poison pill" rights plan) and allow that
offer to proceed. After all, as stated above, one of First Interstate's own
financial advisors has already opined that the original Wells Fargo proposal
was fair from a financial point of view to the First Interstate Stockholders.
However, if the First Interstate Board remains
 
                                       3
<PAGE>
 
intransigent and ignores the views of the Stockholders, Wells Fargo intends
(if necessary) to proceed with a solicitation of written consents from
Stockholders to replace the First Interstate Board with nominees committed to
removing all obstacles to the completion of the Wells Fargo Offer. In any
event, Wells Fargo will continue to pursue its current litigation intended to
force the First Interstate Board to honor its fiduciary duties and remove the
obstacles it is maintaining to a combination with Wells Fargo.
   
  The competing proposals are subject to obtaining virtually identical
regulatory approvals. Wells Fargo is confident that it will be able to obtain
the necessary regulatory approvals for the Wells Fargo Acquisition on a timely
basis and in a time frame substantially identical to that in which FBS would
be able to obtain the necessary regulatory approvals for the FIB/FBS Merger.
Accordingly, Wells Fargo is convinced that the FIB/FBS Merger proposal offers
no timing advantage over the Wells Fargo Offer. Stockholders should thus focus
solely on the economics of the competing proposals. On this basis, Wells Fargo
believes the Wells Fargo Offer is clearly superior. See "Comparison of the Two
Proposals" below.     
 
 
                                       4
<PAGE>
 
                        BACKGROUND OF THE SOLICITATION
 
THE ORIGINAL PROPOSAL
 
  On September 7, 1995, Paul Hazen, Chairman and Chief Executive Officer of
Wells Fargo, met with William Siart, Chairman and Chief Executive Officer of
First Interstate, to discuss the possibility of a merger of the two companies.
No conclusions were reached, but Mr. Siart indicated that First Interstate
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 Wells Fargo intended to deliver a letter containing a new merger
proposal to First Interstate 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. Wells Fargo's letter was then delivered to First Interstate.
 
  On October 18, 1995, First Interstate and, shortly thereafter, Wells Fargo
publicly announced that Wells Fargo had made a proposal (the "Original
Proposal") to First Interstate for a tax-free merger in which First
Interstate's Stockholders would receive 0.625 of a share of Wells Fargo Common
Stock for each Share. Wells Fargo believes 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 First Interstate 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 First Interstate and Wells Fargo would
enhance stockholder value. Mr. Hazen explained the estimates of cost savings
and reductions in revenue being used by Wells Fargo. Mr. Hazen also offered to
have the individuals at Wells Fargo who had prepared those estimates meet with
their counterparts at First Interstate in order to discuss potential cost
savings and reductions in revenue if there were any questions about Wells
Fargo's estimates, but Mr. Siart responded that that would not be necessary
since he agreed with the economic value of the Wells Fargo estimates. Mr.
Siart and Mr. Hazen were joined during part of this meeting by George Roberts
of Kohlberg Kravis Roberts & Co., First Interstate's largest stockholder, and
Warren Buffett of Berkshire Hathaway Inc., Wells Fargo's largest stockholder.
Mr. Buffett expressed his view that an exchange ratio of 0.625 was fair, and
Mr. Roberts and Mr. Siart expressed their view that such ratio was inadequate.
Mr. Hazen then offered to raise the exchange ratio in Wells Fargo's proposal
to 0.65 of a share of Wells Fargo Common Stock for each Share if First
Interstate would enter into a merger agreement with Wells Fargo. Mr. Roberts
indicated that an exchange ratio of 0.65 was still inadequate and indicated
that it would take an exchange ratio of 0.70 to reach agreement at that time.
Mr. Hazen stated that Wells Fargo 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 Wells Fargo who had prepared the estimates
of cost savings and reductions in revenue meet with their counterparts at
First Interstate in order to review such estimates in detail, but Mr. Siart
again declined that offer. Mr. Siart then indicated that he would be prepared
to recommend a merger with Wells Fargo if Wells Fargo 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 First Interstate and Wells Fargo.
 
  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.
 
THE FIB/FBS MERGER AGREEMENT
 
  On November 5, 1995, First Interstate, FBS and FBS Sub entered into the
FIB/FBS Merger Agreement pursuant to which FBS Sub and First Interstate 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 Wells Fargo Offer, including among others that all regulatory and
stockholder approvals be obtained, although it is also subject to
 
                                       5
<PAGE>
 
an additional condition which is not a condition to the Wells Fargo Offer,
namely that each of First Interstate and FBS shall have received a letter from
its accountants to the effect that the FIB/FBS Merger qualifies for pooling of
interests accounting treatment. BASED ON DISCUSSIONS WITH ITS ACCOUNTANTS,
KPMG PEAT MARWICK LLP, WELLS FARGO BELIEVES THERE IS A SIGNIFICANT QUESTION AS
TO WHETHER THE FIB/FBS MERGER QUALIFIES FOR POOLING OF INTERESTS ACCOUNTING
TREATMENT IN LIGHT OF (I) THE INCREASED SHARE REPURCHASE PROGRAM FBS ANNOUNCED
IN CONNECTION WITH THE FIB/FBS MERGER, AND (II) THE NUMBER OF TAINTED SHARES
THAT ARE, BASED ON STATEMENTS MADE BY FBS, EXPECTED TO BE OUTSTANDING AT THE
TIME OF THE CLOSING OF THE FIB/FBS MERGER, WHICH SHARES, FOLLOWING THEIR
EXCHANGE FOR FBS COMMON STOCK, WOULD ALONE EXCEED 10% OF THE FBS COMMON STOCK
OUTSTANDING PRIOR TO THE CLOSING OF THE FIB/FBS MERGER. FOR A DISCUSSION OF
THE CONDITIONS TO THE WELLS FARGO OFFER, SEE "THE OFFER--GENERAL" IN THE WELLS
FARGO PRELIMINARY PROSPECTUS.
 
  As a further condition to the execution and delivery of the FIB/FBS Merger
Agreement, FBS and First Interstate 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").
 
  For a more detailed description of the FIB/FBS Merger Agreement, see
"Background of the Offer--FIB/FBS Merger Agreement" in the Wells Fargo
Preliminary Prospectus.
   
  First Interstate entered into the FIB/FBS Merger Agreement (as well as the
Reciprocal Fee Letters and the 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 Wells Fargo 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 trading day 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
Wells Fargo proposal produced a value of $139.41 per Share, or $7.26 per Share
higher. Moreover, according to First Interstate's statement on Schedule 14D-9
filed with the Securities and Exchange Commission (the "Commission") on
November 20, 1995 (as amended, the "First Interstate Schedule 14D-9"), First
Interstate 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 Wells Fargo's Original Proposal (at a 0.625
exchange ratio, or 6.3% below the exchange ratio being offered pursuant to the
Wells Fargo Offer) and the FIB/FBS Merger (at the agreed upon 2.60 exchange
ratio) were both fair from a financial point of view to the Stockholders.     
 
  According to the First Interstate Schedule 14D-9, FBS and certain other
potential merger candidates were afforded an opportunity to discuss with First
Interstate's financial advisors a possible business combination with First
Interstate. Wells Fargo was not contacted by First Interstate's financial
advisors and was not afforded an opportunity to conduct due diligence on First
Interstate or to receive any confidential information. First Interstate has
also amended its "poison pill" rights plan and taken certain other actions to
accommodate the FIB/FBS Merger, but has not taken any similar action with
respect to any Wells Fargo proposal.
 
THE WELLS FARGO OFFER AND RELATED ACTIONS
 
  On November 13, 1995, Wells Fargo 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 the Wells Fargo Offer, Mr. Hazen
again stated that Wells Fargo would be prepared to enter into a merger
agreement with First Interstate providing for the same consideration as the
Wells Fargo Offer. In the event that First Interstate did not elect to
terminate the FIB/FBS Merger Agreement, Wells Fargo offered to agree to a
process pursuant to which both FBS and Wells Fargo would each have 10 days to
submit their best and final merger proposals, which proposals would together
be presented to First Interstate's Stockholders who could decide for
themselves which proposal was in their best interest. This latter proposal was
designed to reduce the time and expense involved in a prolonged contest, and
the resultant disruption to First Interstate, but neither First Interstate's
management nor the First Interstate Board has responded to the proposal.
 
                                       6
<PAGE>
 
  As part of the November 13, 1995 announcement, Wells Fargo also stated that
it anticipated filing (a) this Proxy Statement and (b) preliminary consent
solicitation materials with the Commission for use in soliciting written
consents from Stockholders of First Interstate to replace the current members
of the First Interstate Board with nominees who are committed to removing any
obstacles to the Wells Fargo Merger. THIS PROXY STATEMENT DOES NOT CONSTITUTE
A SOLICITATION OF CONSENTS FROM STOCKHOLDERS. ANY SUCH SOLICITATION WILL BE
MADE ONLY PURSUANT TO SEPARATE CONSENT SOLICITATION MATERIALS COMPLYING WITH
THE REQUIREMENTS OF SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED (THE "EXCHANGE ACT").
   
  Wells Fargo also announced on November 13, 1995 the filing of a complaint
against First Interstate, the members of the First Interstate Board, FBS and
FBS Sub in the Delaware Chancery Court which, among other things, seeks to
invalidate the FIB/FBS Merger Agreement and the "lock-up" arrangements granted
to FBS pursuant to the Reciprocal Fee Letters and the Reciprocal Stock Option
Agreements and seeks injunctive relief requiring the First Interstate Board to
redeem the "poison pill" rights associated with the Shares and to prevent
First Interstate from using anti-takeover devices or taking other actions
intended to impede or delay the acquisition of First Interstate by Wells
Fargo. For a further description of this litigation (including information
concerning an amended complaint alleging that FBS repurchased on the open
market more than $125 million of its common stock, thereby artificially
inflating the price of the FBS common stock and denying First Interstate's
stockholders the ability to assess accurately the market value of the FIB/FBS
Merger proposal or compare it to the Wells Fargo Offer), and for a description
of (a) certain class action, derivative action and shareholder litigation
brought against First Interstate, the members of the First Interstate Board
and FBS alleging, among other things, breach of fiduciary duty to the
stockholders of First Interstate, violations of federal securities laws by
making false and misleading statements and material omissions of fact
regarding the FIB/FBS Merger and the Offer, abuse of control and tortious
interference with prospective economic advantage, (b) certain litigation
brought by First Interstate and FBS against Wells Fargo alleging, among other
things, violations of federal securities laws by releasing certain financial
projections and by making allegedly false statements regarding the FIB/FBS
Merger and (c) certain counterclaims brought by Wells Fargo against First
Interstate and FBS alleging, among other things, violations of federal
securities laws by making false and misleading statements and material
omissions of fact regarding the FIB/FBS Merger and the Offer, see "Background
of the Offer--Litigation" in the Wells Fargo Preliminary Prospectus.     
   
  On November 13, 1995, Wells Fargo filed applications and notices in draft
form with the Federal Reserve Bank of San Francisco (the "FRB-SF") seeking
approval of, among other things, the Wells Fargo Acquisition; the applications
and notices were refiled in final form on November 17, 1995. Wells Fargo has
filed additional applications and notices with various governmental
authorities seeking all approvals required to permit consummation of the Wells
Fargo Acquisition. FBS announced that it had filed an application in final
form for the FIB/FBS Merger with the Federal Reserve Bank of Minneapolis (the
"FRB-M") on November 10, 1995. On December 14, 1995, the FRB-M accepted the
FBS application and wrote that it expected a Federal Reserve Board decision by
February 12, 1996. On December 20, 1995, the FRB-SF accepted Wells Fargo's
application and wrote that it expected a Federal Reserve Board decision by
February 18, 1996. In its application filed with the FRB-SF, Wells Fargo has
committed to divest approximately $1 billion in deposits and related assets in
connection with regulatory concerns regarding possible adverse competitive
effects of the Wells Fargo Acquisition. It is not possible to predict with
certainty the acceptability of any particular divestiture plan to governmental
agencies. However, based on discussions with Wells Fargo's counsel, Sullivan &
Cromwell, and Wells Fargo's own knowledge of and experience in the regulatory
process, Wells Fargo believes that the divestitures it has proposed in its
application filed with the FRB-SF are consistent with the competitive analysis
set forth in that application. Moreover, based on such discussions, knowledge
and experience and because Wells Fargo fully intends to make all divestitures
required in order to secure the necessary approvals, Wells Fargo is confident
that, even if a governmental agency disagreed with the competitive analysis
set forth in the Wells Fargo application and required a higher level of
divestitures, Wells Fargo would be able to reach agreement with that agency on
appropriate divestitures and obtain the regulatory approvals required for the
Wells Fargo Acquisition on a timely basis and in a time frame substantially
identical to that in which FBS would be able to obtain the regulatory
approvals required for the FIB/FBS Merger. See "The Offer--Regulatory Approval
Condition" in the Wells Fargo Preliminary Prospectus.     
 
                                       7
<PAGE>
 
  On November 20, 1995, the First Interstate Schedule 14D-9 was filed with the
Commission stating, among other things, that the First Interstate Board was
committed to completing the FIB/FBS Merger and recommending that First
Interstate's Stockholders not tender their Shares in the Wells Fargo Offer.
Wells Fargo believes that most of the reasons cited in the First Interstate
Schedule 14D-9 for selecting the FIB/FBS Merger proposal over the Wells Fargo
Offer are subject to serious question, and that these reasons do not justify
the rejection of the Wells Fargo Offer with its substantially higher market
value. See "Comparison of the Two Proposals--Other Considerations Affecting
Value" below.
   
  AT ALL TIMES DURING THE FIRST INTERSTATE BOARD'S CONSIDERATION OF EACH WELLS
FARGO PROPOSAL AND FBS PROPOSAL, THE THEN CURRENT WELLS FARGO PROPOSAL HAS
PRODUCED A MARKET VALUE HIGHER THAN THE MARKET VALUE PRODUCED BY THE THEN
CURRENT FBS PROPOSAL. ON JANUARY 15, 1996 (THE LAST TRADING DAY PRIOR TO THE
DATE OF THIS PRELIMINARY PROXY STATEMENT) THE DIFFERENTIAL AMOUNTED TO $19.35
PER SHARE, AND THE AGGREGATE MARKET VALUE OF THE OFFER EXCEEDED THE AGGREGATE
MARKET VALUE OF THE FBS PROPOSAL BY APPROXIMATELY $1.5 BILLION.     
 
TIMING OF THE WELLS FARGO OFFER
 
  The Wells Fargo Offer is currently scheduled to expire on    , 1996;
however, it is Wells Fargo's current intention to extend the Wells Fargo Offer
from time to time as necessary until all conditions to the Wells Fargo Offer
have been satisfied or waived. See "The Offer--Extension, Termination and
Amendment" in the Wells Fargo Preliminary Prospectus. Wells Fargo expects that
the Wells Fargo Stockholder Approval Condition (as defined in the Wells Fargo
Preliminary Prospectus) will be satisfied by    , 1996 (the date on which it
has called a special meeting of its stockholders to approve the issuance of
shares of Wells Fargo Common Stock pursuant to the Wells Fargo Offer and the
Wells Fargo Merger) and that the other conditions to the Wells Fargo Offer
will be satisfied once the Regulatory Approval Condition, the FIB/FBS Merger
Agreement Condition and the Rights Plan and DGCL 203 Condition (as each term
is defined in the Wells Fargo Preliminary Prospectus) are satisfied.
   
  Wells Fargo is confident that it will be able to obtain the regulatory
approvals required for the Wells Fargo Acquisition on a timely basis and in a
time frame substantially identical to that in which FBS would be able to
obtain the regulatory approvals required for the FIB/FBS Merger. See "The
Offer--Regulatory Approval Condition" in the Wells Fargo Preliminary
Prospectus.     
 
  First Interstate has scheduled a special stockholders meeting to vote on the
FIB/FBS Merger Agreement on     , 1996. Assuming First Interstate's
stockholders do not approve the FIB/FBS Merger Agreement, the FIB/FBS Merger
Agreement Condition will then be satisfied. Wells Fargo believes that the
First Interstate Board would at that point respect the vote of First
Interstate's stockholders and remove the obstacles it is maintaining to the
Wells Fargo Offer and Wells Fargo Merger, thereby satisfying the Rights Plan
and DGCL 203 Condition. However, if the First Interstate Board does not do so,
Wells Fargo presently intends to commence a solicitation of written consents
from First Interstate's stockholders (or continue such a consent solicitation
if it has by then already been commenced) to replace the members of the First
Interstate Board with individuals who would (subject to their fiduciary
duties) do so. Although Wells Fargo does not currently expect to commence such
a consent solicitation prior to First Interstate's special stockholders
meeting, it reserves the right to do so if circumstances so warrant. Wells
Fargo believes that commencement of such a consent solicitation would not
require regulatory approval. Any such consent solicitation would be
consummated as soon as any required approvals are obtained (Wells Fargo has
already applied for such approvals as part of its applications to satisfy the
Regulatory Approval Condition) and unrevoked and valid consents of the holders
of a majority of the outstanding Shares are delivered to First Interstate.
Wells Fargo also intends to pursue its currently pending litigation in order
to satisfy the Rights Plan and DGCL 203 Condition. For further information
about the Rights Plan and DGCL 203 Condition and Wells Fargo's plans for
satisfying it, see "The Offer--Rights Plan and DGCL 203 Condition" in the
Wells Fargo Preliminary Prospectus.
 
 
 
                                       8
<PAGE>
 
                        COMPARISON OF THE TWO PROPOSALS
 
  Wells Fargo is convinced that the Wells Fargo Offer provides demonstrably
superior value when compared to the FBS proposal, in both the short and the
long term, for the First Interstate Stockholders.
 
MARKET VALUE
 
  It is beyond question that the Wells Fargo Offer has produced a
substantially higher market value per Share than has the FIB/FBS Merger
proposal.
 
<TABLE>   
<CAPTION>
                                          MARKET VALUE PER SHARE PRODUCED BY
                                         WELLS FARGO OFFER AND FIB/FBS MERGER*
                                        ---------------------------------------
                                        WELLS FARGO
                                        OFFER AT A  FIB/FBS MERGER
                                        TWO-THIRDS    AT A 2.60
                                         EXCHANGE      EXCHANGE
BASED ON CLOSING 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
 (day of announcement of Original
 Proposal)
January 15, 1996.......................    140.25       120.90        19.35
 (last trading day before the date of
 this preliminary proxy
 statement)
Average of indicated number of trading
 days preceding
 January 15, 1996:
 10 Trading Days.......................    141.31       126.69        14.62
 20 Trading Days.......................    142.26       128.51        13.75
 30 Trading Days.......................    143.16       130.63        12.53
</TABLE>    
- --------
* Based on the closing price per share of the common stock of Wells Fargo or
 FBS, as the case may be, for the indicated dates or periods. The then current
 exchange ratio proposed by Wells Fargo before October 26, 1995 was 0.625 and
 the then current exchange ratio proposed by Wells Fargo from October 26, 1995
 until announcement of the Offer on November 13, 1995 was 0.65 rather than the
 two-thirds ratio used in this chart.
 
  Moreover, the indicated differentials in market value between the competing
proposals were realized even though Wells Fargo believes the market has
significantly discounted its shares since October 18, 1995 due to uncertainty
over whether Wells Fargo will succeed in eliminating the obstacles to its
exchange offer being maintained by the First Interstate Board.
 
OTHER CONSIDERATIONS AFFECTING VALUE
 
  In the First Interstate Schedule 14D-9, First Interstate included a list of
reasons for selecting the FIB/FBS Merger proposal over the Wells Fargo Offer.
Wells Fargo believes that most of these reasons are subject to serious
question, and that these reasons do not justify the rejection of Wells Fargo's
proposal with its substantially higher market value. A discussion of such
reasons and Wells Fargo's responses follows.
 
                                       9
<PAGE>
 
<TABLE>
<CAPTION>
 FIRST INTERSTATE'S
   LISTED REASON                                WELLS FARGO'S RESPONSE
 ------------------                             ----------------------
 <C>                                    <S>
 An FBS merger produces a top three     Five of those states have a combined
 ranking (in terms of deposits) in ten  population of less than 4.5 million
 states, or six more states than a      people. A Wells Fargo merger (unlike
 Wells Fargo merger.                    an FBS merger) produces a top three
                                        ranking in California; the population
                                        of the states where a Wells Fargo
                                        merger produces a top three ranking is
                                        40 million while the population of the
                                        states where an FBS merger produces a
                                        top three ranking is only 21 million.

 A Wells Fargo merger would produce     Four out of First Interstate's five
 greater concentration in California    most recent significant acquisitions
 assets, specifically California real   (based on asset size as set forth on
 estate loans, which "is inconsistent   page 32 of First Interstate's 1994
 with the First Interstate Board's      Annual Report) have been in
 longstanding desire to achieve greater California. Further, First Interstate
 geographic diversification."           has sold its operations in Oklahoma
                                        and part of its operations in New
                                        Mexico. Between 1993 and 1994 First
                                        Interstate increased its total
                                        California real estate loans by 151%
                                        and its California commercial real
                                        estate loans by 78%.

 A FBS merger would provide further     First Interstate's serious financial
 geographic diversification of assets   problems in the early 1990's were
 outside California and thereby reduce  widely attributed to credit quality
 credit risk.                           and other problems in its units
                                        outside California, primarily Arizona
                                        and Texas.

 A Wells Fargo merger presents a        First Interstate's stated philosophy
 "materially increased exposure to real notwithstanding, between 1993 and 1994
 estate lending, which exposure is      First Interstate's total real estate
 inconsistent with First Interstate's   loans increased by 61% and its
 credit philosophy."                    commercial real estate loans increased
                                        by 33%.

 Anticipated cost savings from an FBS   When measured against a comparable
 merger as compared to a Wells Fargo    expense base, Wells Fargo's estimate
 merger.                                of cost savings from a Wells Fargo
                                        merger is $500 million higher than
                                        FBS's estimate of cost savings from an
                                        FBS merger. Moreover, Wells Fargo is
                                        convinced that its estimate is
                                        conservative while the FBS estimate is
                                        unrealistic--(i) the FBS estimate (as
                                        a percentage of operating expense
                                        base) is two to three times those
                                        projected in comparable transactions,
                                        while the Wells Fargo estimate is
                                        consistent with those projected in
                                        comparable transactions and (ii) the
                                        FBS estimate includes no provision for
                                        revenue loss, while the Wells Fargo
                                        estimate does.

 Wells Fargo's cost savings would be    The statement is internally
 accompanied by substantial revenue     inconsistent, and the former claim is
 losses, while FBS's cost savings would inconsistent with statements by both
 not.                                   First Interstate and FBS for their own
                                        in-market acquisitions and
                                        inconsistent with projections in other
                                        bank mergers.

 Wells Fargo would lose substantial     Even at the highest divestiture levels
 revenues through divestitures.         estimated in preliminary proxy
                                        materials filed with the Commission by
                                        First Interstate, Wells Fargo is
                                        convinced net revenue loss would be
                                        minimal.

 Wells Fargo would lose substantial     Wells Fargo's experience in the
 revenues through "significant" deposit Crocker National merger (an in-market
 attrition.                             merger with a company that, at the
                                        time of acquisition, represented 70%
                                        of Wells Fargo's assets) demonstrates
                                        that deposits can grow, even given a
                                        substantial reduction in branches, if
                                        that reduction is properly managed.
</TABLE>
 
 
                                       10
<PAGE>
 
<TABLE>
<CAPTION>
 FIRST INTERSTATE'S
   LISTED REASON                                WELLS FARGO'S RESPONSE
 ------------------                             ----------------------
 <C>                                    <S>
 FBS would have no significant revenue  FBS's presentations to analysts show
 reductions as a result of cost savings 32% of their projected cost savings
 because its cost savings would be      coming from line operations.
 primarily derived from consolidation
 of back office and operating systems
 (as opposed to line operations).

 FBS has a proven record of achieving   An FBS acquisition of First Interstate
 cost savings and efficiencies in ac-   and another pending FBS acquisition
 quisitions; Wells Fargo has not con-   would require integration of
 summated the acquisition of a signifi- institutions with assets aggregating
 cant bank since 1988.                  over 178% of FBS's total assets, while
                                        a Wells Fargo acquisition of First
                                        Interstate would require integration
                                        of an institution with assets
                                        aggregating 110% of Wells Fargo's
                                        total assets. The current FBS
                                        management has never consummated an
                                        acquisition comparable to Wells
                                        Fargo's acquisition of Crocker
                                        National, which represented 70% of
                                        Wells Fargo's 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; all six of Wells Fargo's
                                        most senior executive officers were
                                        executive officers at the time of the
                                        Crocker National acquisition. Wells
                                        Fargo's 1990 acquisition of Great
                                        American's assets and deposits was
                                        larger (in terms of deposits) than any
                                        acquisition by First Interstate and
                                        larger than all but one of FBS's
                                        acquisitions since that time.

 A Wells Fargo merger would provide     Wells Fargo sees substantial revenue
 fewer product lines and revenue growth growth opportunities in a merger with
 opportunities.                         First Interstate, in supermarket
                                        branches and banking centers, small
                                        business lending, consumer lending,
                                        direct distribution, commercial
                                        lending, trust and investment
                                        management. In addition, Wells Fargo
                                        notes that FBS's ratio of noninterest
                                        income (after subtracting a non-
                                        recurring gain) to average assets
                                        (2.3% on an annualized basis for the
                                        quarter ended September 30, 1995) is
                                        currently lower than the comparable
                                        ratio for Wells Fargo (2.7% on an
                                        annualized basis for the quarter ended
                                        September 30, 1995).

 First Interstate Stockholders could    This conclusion can be reached only if
 achieve higher cash earnings per share FBS is assumed to achieve cost savings
 from an FBS merger than a Wells Fargo  two to three times the level projected
 merger.                                in other major market extension
                                        mergers in the banking industry and
                                        Wells Fargo is assumed to suffer
                                        revenue loss greater than projected
                                        and far above industry norms. If cost
                                        savings and revenue reductions are
                                        more in line with Wells Fargo
                                        projections and industry norms, a
                                        Wells Fargo merger would produce
                                        substantially higher cash earnings per
                                        share.
</TABLE>
 
 
                                       11
<PAGE>
 
<TABLE>   
<CAPTION>
 FIRST INTERSTATE'S
   LISTED REASON                                WELLS FARGO'S RESPONSE
 ------------------                             ----------------------
 <C>                                    <S>
 Although First Interstate acknowledges Wells Fargo has already made
 that it is "likely that Wells would    substantial divestiture commitments to
 ultimately receive all [regulatory]    eliminate this concern. Wells Fargo is
 approvals," Wells Fargo could require  confident that it will be able to
 a longer period of time because of an- obtain the regulatory approvals
 titrust concerns.                      required for the Wells Fargo Offer and
                                        the Wells Fargo Merger on a timely
                                        basis and in a time frame
                                        substantially identical to that in
                                        which FBS would be able to obtain the
                                        regulatory approvals required for the
                                        FIB/FBS Merger. See "Background of the
                                        Solicitation--Timing of the Wells
                                        Fargo Offer."

 Fairness opinions of First Inter-      In an extraordinary and perhaps
 state's financial advisors.            unprecedented action, one of First
                                        Interstate's own financial advisors
                                        included in its fairness opinion an
                                        additional opinion that Wells Fargo's
                                        Original Proposal to merge with First
                                        Interstate (at an exchange ratio of
                                        0.625, or approximately $8 to $9 per
                                        Share lower than the value produced by
                                        the Wells Fargo Offer with an exchange
                                        ratio of two-thirds) was fair from a
                                        financial point of view to the First
                                        Interstate Stockholders. The other
                                        First Interstate financial advisor
                                        explicitly qualified its fairness
                                        opinion by stating that it was not
                                        passing on the relative merits of the
                                        competing proposals and by assuming
                                        that the FIB/FBS Merger is of long-
                                        term strategic importance to First
                                        Interstate solely on the basis of
                                        being so informed by the First
                                        Interstate Board.

 First Interstate and FBS "share common Wells Fargo also has a number of
 information systems which should       systems in common with First
 greatly facilitate the integration of  Interstate. Wells Fargo believes that
 the two companies' operations;" "[i]n  these common systems between FBS and
 contrast, Wells utilizes               First Interstate and Wells Fargo and
 a system which is incompatible with    First Interstate would merely simplify
 First                                  initial customer conversions and do
 Interstate's."                         not impact overall systems efficiency
                                        (which depends on interactions between
                                        systems and systems architecture).
                                        Wells Fargo 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.

 The trading price of Wells Fargo's     This is also true of FBS's common
 common stock in relation to book value stock. The price to book value and
 and earnings is among the highest in   price to earnings (using 1996 earnings
 the banking industry.                  estimates) ratios as set forth in
                                        First Call estimates as of December
                                        29, 1995 for the Wells Fargo Common
                                        Stock and the FBS Common Stock and the
                                        average of these ratios for the 25
                                        largest banks (excluding Wells Fargo
                                        and First Interstate) were 3.0x and
                                        9.8x, 2.4x and 10.7x and 1.7x and
                                        10.1x, respectively.
</TABLE>    
 
 
                                       12
<PAGE>
 
<TABLE>   
<CAPTION>
 FIRST INTERSTATE'S
   LISTED REASON                                WELLS FARGO'S RESPONSE
 ------------------                             ----------------------
 <C>                                    <S>
 Concerns that the Wells Fargo propos-  Wells Fargo believes there is no
 al, but not the FBS proposal, would be meaningful difference between purchase
 accounted for as a purchase rather     accounting and pooling of interests
 than a pooling of interests.           accounting. In addition, based on
                                        discussions with its accountants (KPMG
                                        Peat Marwick LLP), Wells Fargo
                                        believes there is a significant
                                        question as to whether the FBS
                                        transaction will qualify for pooling
                                        of interests accounting treatment (in
                                        light of both the increased share
                                        repurchase program announced by FBS in
                                        connection with the FIB/FBS Merger
                                        Agreement and the number of tainted
                                        First Interstate Shares).

 A risk that the market value of Wells  The market value of Wells Fargo's
 Fargo's common stock would decline if  common stock increased by $15.375 on
 the market rejected Wells Fargo's view the day of the announcement of Wells
 that the combined company should be    Fargo's Original Proposal to acquire
 valued with an emphasis on cash flow.  First Interstate using purchase
                                        accounting.

 The combined FBS-First Interstate en-  The combined Wells Fargo-First
 tity would be the ninth largest bank-  Interstate entity would rank seventh
 ing institution in the country in      largest in terms of assets and fourth
 terms of total assets and fifth larg-  largest in terms of market value.
 est in terms of market value.

 The expectation that the FBS merger    Wells Fargo also expects that its
 will be tax free.                      proposal will be tax free.
</TABLE>    
   
  In addition, the First Interstate Schedule 14D-9 refers generally and
vaguely to such issues as FBS's compatible and complementary corporate
philosophy and Wells Fargo's "very different" strategies and "significantly
different characteristics." Wells Fargo was never, however, given a sufficient
opportunity to address any of these concerns with First Interstate. Likewise,
the First Interstate Schedule 14D-9 refers repeatedly to presentations by
First Interstate's financial advisors on various issues and to such financial
advisors' roles in assisting First Interstate to find a potential merger
partner, but Wells Fargo, unlike FBS and certain other potential merger
partners, was never given an opportunity to meet or discuss any of these
issues with First Interstate's financial advisors.     
 
  Moreover, in its November 6, 1995 press release announcing the FIB/FBS
Merger Agreement, First Interstate listed "the hostile nature of the Wells
approach" as one of its reasons for selecting the FIB/FBS Merger proposal over
the Wells Fargo Offer. This reason, however, is not relevant to a
determination of which proposal provides greater value for the First
Interstate Stockholders. In any event, this reason is particularly
uncompelling in light of the fact that Wells Fargo made its offer directly to
Stockholders only after several attempts to arrange a negotiated transaction
with First Interstate were rejected by First Interstate's management and the
First Interstate Board.
 
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. Wells Fargo has a history of success with individual and small
business customers. Wells Fargo is also known for its expertise in the area of
alternative delivery as it conducts
 
                                      13
<PAGE>
 
business with many of its customers via phone, ATMs, supermarket locations and
electronically through the Internet. Wells Fargo 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 Wells Fargo
operates throughout the entire state.
 
  With the proposed combination with First Interstate, Wells Fargo will
solidify its position in California with deposits of approximately $58
billion. Additionally, through the presence of First Interstate 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 First Interstate'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
Wells Fargo and First Interstate 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 First
Interstate operates. Thus, when viewing the two respective franchises, Wells
Fargo believes a Wells Fargo/First Interstate combination with its deeper
penetration of the populous California market coupled with the rapid growing
western states covered by First Interstate is preferable to an FBS/First
Interstate combination with its diversification into a geographical area which
would dilute the economic growth prospects for First Interstate's
Stockholders. Put differently, a combination of Wells Fargo and First
Interstate would span fewer states than would a combination of FBS and First
Interstate, but the population of the states where Wells Fargo and First
Interstate combined would rank number one, two or three in terms of deposits
would be approximately 40 million while the population of the states where FBS
and First Interstate combined would rank number one, two or three in terms of
deposits would be only approximately 21 million.
 
                                  WELLS FARGO
 
  Wells Fargo is a bank holding company incorporated under the laws of the
State of Delaware and registered under the Bank Holding Company Act of 1956,
as amended. 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.
 
  Wells Fargo'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.
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, Wells Fargo 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 the caption "Business of Wells Fargo" in the Wells Fargo
Preliminary Prospectus.
 
  Wells Fargo is subject to the informational requirements of the Exchange Act
and in accordance therewith files reports and other information with the
Commission. The reports, proxy statements and other information filed by Wells
Fargo with the Commission may be inspected and copied at the Commission's
public reference room located at 450 Fifth Street, N.W., Judiciary Plaza,
Washington, D.C. 20549, and at the public reference facilities in the
Commission's regional offices in New York (Seven World Trade Center, Suite
1300, New York, New York 10048) and Chicago (Citicorp Center, 500 West Madison
Street, Suite 1400, 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., Judiciary Plaza,
Washington, D.C. 20549. In addition such material can be inspected at the
offices of the New York Stock Exchange, Inc. (20 Broad Street,
 
                                      14
<PAGE>
 
New York, New York 10005) and the Pacific Stock Exchange (301 Pine Street, San
Francisco, California 94104), on which certain of Wells Fargo's securities,
including the Wells Fargo Common Stock, are listed.
 
  Wells Fargo has its principal executive offices at 420 Montgomery Street, San
Francisco, California 94163, telephone number (415) 477-1000.
   
  Certain information concerning the directors and executive officers of Wells
Fargo and other employees and representatives of Wells Fargo who may solicit
proxies from Stockholders is set forth in Annex A hereto. Certain information
concerning the Shares held by the persons described in the preceding sentence
and by Wells Fargo, and certain transactions between any of them and First
Interstate, is set forth in Annex B hereto.     
 
                                       15
<PAGE>
 
                             VOTING OF PROXY CARDS
 
PROCEDURAL INSTRUCTIONS
 
  The accompanying WHITE proxy card will be voted in accordance with the
Stockholder's instructions on such WHITE proxy card. Stockholders may vote
against the approval and adoption of the FIB/FBS Merger Agreement or may
withhold their votes or vote for such approval and adoption by marking the
proper box on the WHITE proxy and signing, dating and returning it promptly in
the enclosed postage-paid envelope. If a Stockholder returns a WHITE proxy
card that is signed, dated and not marked, that Stockholder will be deemed to
have voted against approval and adoption of the FIB/FBS Merger Agreement.
   
  Only Stockholders of record on the Record Date are eligible to give their
proxies. Therefore, any Stockholder owning shares held in the name of a
brokerage firm, bank, or other institution should sign, date and return the
WHITE proxy card to such brokerage firm, bank or other institution in the
envelope provided by that firm.     
 
  Approval and adoption of the FIB/FBS Merger Agreement requires the
affirmative vote of a majority of Shares outstanding on the Record Date.
 
  WELLS FARGO URGES YOU TO VOTE AGAINST THE FIB/FBS MERGER AGREEMENT AND
PRESERVE YOUR OPPORTUNITY TO ACCEPT THE HIGHER VALUE WELLS FARGO OFFER. IF YOU
WANT THE WELLS FARGO OFFER TO SUCCEED, VOTE AGAINST THE FIB/FBS MERGER
AGREEMENT BY SIGNING, DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD
TODAY.
 
REVOCATION OF PROXIES
 
  An executed proxy may be revoked at any time prior to its exercise by
submitting another proxy with a later date, by appearing in person at the
Special Meeting and voting or by sending a written, signed, dated revocation
which clearly identifies the proxy being revoked to either (a) Wells Fargo in
care of D.F. King & Co., Inc. at 77 Water Street, 20th Floor, New York, New
York 10005, or (b) the principal executive offices of First Interstate at 633
West Fifth Street, Los Angeles, California 90071. A revocation may be in any
written form validly signed by the record holder as long as it clearly states
that the proxy previously given is no longer effective. Wells Fargo requests
that a copy of any revocation sent to First Interstate also be sent to Wells
Fargo in care of D.F. King & Co., Inc. at the above address so that Wells
Fargo may more accurately determine if and when proxies have been received
from the holders of record on the Record Date of a majority of the Shares then
outstanding.
 
  IF YOU HAVE ALREADY SENT A PROXY CARD TO THE BOARD OF DIRECTORS OF FIRST
INTERSTATE, YOU MAY REVOKE THAT PROXY AND VOTE AGAINST THE FIB/FBS MERGER
AGREEMENT BY SIGNING, DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD. THE
LATEST DATED PROXY IS THE ONLY ONE THAT COUNTS.
 
APPRAISAL RIGHTS
 
  According to statements made by FBS in its Registration Statement on Form S-
4 relating to the FIB/FBS Merger, Stockholders will not be entitled to any
appraisal rights in connection with the FIB/FBS Merger.
 
                                      16
<PAGE>
 
                              OWNERSHIP OF SHARES
 
  Each Share is entitled to one vote, and the Shares are the only class of
securities of First Interstate currently entitled to vote at the Special
Meeting. According to First Interstate's Form 10-K for the fiscal year ended
December 31, 1994, there were approximately 24,976 holders of record of Shares
as of February 28, 1995, and according to First Interstate's Form 10-Q for the
period ending September 30, 1995, as of October 31, 1995, there were
75,744,254 Shares outstanding.
 
  The following table sets forth the share ownership of all persons who own
beneficially more than 5% of First Interstate's outstanding Shares to the
extent known by the persons on whose behalf the proxy solicitation is being
made. The information below with respect to such beneficial ownership is based
upon information filed with the Commission pursuant to Sections 13 (d) or 14
of the Exchange Act.
 
<TABLE>
<CAPTION>
                                                       AMOUNT AND
                                                         NATURE
                                                           OF
                                                       BENEFICIAL    PERCENT OF
                                                       OWNERSHIP     OUTSTANDING
   NAME AND ADDRESS OF BENEFICIAL OWNER                OF SHARES       SHARES
   ------------------------------------                ----------    -----------
   <S>                                                 <C>           <C>
   DI Associates and KKR Associates................... 6,131,693(1)     8.26%
    c/o Kohlberg Kravis Roberts & Co.
    9 West 57th Street
    New York, NY 10019
   Oppenheimer Group, Inc. ........................... 5,170,191(2)     6.78%
    Oppenheimer Tower,
    World Financial Center
    New York, NY 10281
   The Capital Group Companies, Inc. and
    Capital Research Management Company............... 4,084,020(3)     5.36%
    333 South Hope Street
    Los Angeles, CA 90071
</TABLE>
- --------
(1) According to the First Interstate Proxy Statement, dated March 20, 1995
    (the "First Interstate Proxy Statement") this information is based upon a
    Schedule 13D dated February 3, 1993 filed with the Commission jointly by
    DI Associates and KKR Associates, which have sole voting and dispositive
    power as to all of the Shares.
(2) According to the First Interstate Proxy Statement, this information is
    based upon a Schedule 13G dated February 1, 1995 filed with the Commission
    by Oppenheimer Group, Inc. ("Group"), as a parent holding company on
    behalf of Oppenheimer & Co., L.P. and Group's subsidiary companies and/or
    certain investment advisory clients or discretionary accounts of such
    subsidiaries. Group does not have sole voting and dispositive power with
    respect to any of the Shares, and has shared voting and dispositive power
    as to all of the Shares. An investment advisory subsidiary, Oppenheimer
    Capital, has shared voting and dispositive power as to 5,130,281 of such
    Shares, and sole voting and dispositive power as to none of the Shares.
(3) This information is based upon a Schedule 13G dated February 8, 1995 filed
    with the Commission by The Capital Group Companies, Inc. and Capital
    Research Management Company. The Capital Group Companies, Inc. has sole
    voting power with respect to 54,020 of the Shares and sole dispositive
    power with respect to all of the Shares, while Capital Research Management
    Company does not have sole voting power with respect to any of the Shares
    and has sole dispositive power with respect to 4,030,000 Shares.
 
  For information relating to the ownership of Shares by the current directors
and executive officers of First Interstate, see Annex C hereto.
 
                                      17
<PAGE>
 
  The information concerning First Interstate contained in this Proxy
Statement (including Annex C hereto) has been taken from or is based upon
documents and records on file with the Commission and other publicly available
information. Wells Fargo has no knowledge that would indicate that statements
relating to First Interstate contained in this Proxy Statement in reliance
upon publicly available information are inaccurate or incomplete. Wells Fargo,
however, has not been given access to the books and records of First
Interstate, was not involved in the preparation of such information and
statements, and is not in a position to verify, or make any representation
with respect to the accuracy of, any such information or statements.
 
  The First Interstate Proxy Statement contains additional information
concerning the Shares, beneficial ownership of the Shares by and other
information concerning First Interstate's directors and officers, compensation
paid to executive officers, and the principal holders of Shares.
 
                            SOLICITATION OF PROXIES
 
  Proxies will be solicited by mail, telephone, telegraph, telex, telecopier
and advertisement and in person. Solicitation may be made by directors,
executive officers and other representatives of Wells Fargo. See Annex A
hereto for a listing of such persons.
 
  Banks, brokerage houses and other custodians, nominees and fiduciaries will
be requested to forward the solicitation materials to the beneficial owners of
Shares for which they hold of record and Wells Fargo will reimburse them for
their reasonable out-of-pocket expenses.
 
  In addition, Wells Fargo has retained D.F. King & Co., Inc. ("D.F. King") to
assist and to provide advisory services in connection with this Proxy
Solicitation for which D.F. King will be paid a fee of not more than $200,000
and will be reimbursed for reasonable out-of-pocket expenses. Wells Fargo will
indemnify D.F. King against certain liabilities and expenses in connection
with the Proxy Solicitation, including liabilities under the federal
securities law.
 
  CS First Boston Corporation ("CS First Boston") and Montgomery Securities
("Montgomery Securities") are providing certain financial advisory services to
Wells Fargo in connection with its proposal to acquire First Interstate,
including, among other things, the Proxy Solicitation. For information
concerning the fees to be paid to CS First Boston and Montgomery Securities in
connection with such engagement, see "The Offer--Fees and Expenses" in the
Wells Fargo Preliminary Prospectus. Wells Fargo has also agreed to reimburse
each of CS First Boston and Montgomery Securities for its reasonable out-of-
pocket expenses, including the fees and expenses of its legal counsel,
incurred in connection with its engagement, and has agreed to indemnify each
of CS First Boston and Montgomery Securities and certain related persons and
entities against certain liabilities and expenses in connection with its
engagement, including certain liabilities under the federal securities laws.
In connection with CS First Boston's and Montgomery Securities' engagement as
financial advisors, Wells Fargo anticipates that certain employees of each of
CS First Boston and Montgomery Securities may communicate in person, by
telephone or otherwise with a limited number of institutions, brokers or other
persons who are Stockholders for the purpose of assisting in the Proxy
Solicitation. CS First Boston and Montgomery Securities will not receive any
fee for or in connection with such solicitation activities by their respective
employees apart from the fees they are otherwise entitled to receive as
described above.
 
  In addition to the fees to be received by CS First Boston in connection with
its engagement as financial advisor to Wells Fargo, since January 1, 1993, CS
First Boston has rendered various investment banking and financial advisory
services for Wells Fargo for which it has received customary compensation.
 
  The expenses related to the Proxy Solicitation will be borne by Wells Fargo.
Wells Fargo does not intend to seek reimbursement of its expenses related to
the Proxy Solicitation from First Interstate whether or not the Proxy
Solicitation is successful.
 
                                      18
<PAGE>
 
  If you have any questions concerning this Proxy Solicitation or the
procedures to be followed to execute and deliver a proxy, please contact D.F.
King & Co., Inc. at the address or phone number specified below.
 
  YOUR PROXY AND PROMPT ACTION ARE IMPORTANT. YOU ARE URGED TO GRANT YOUR
PROXY BY SIGNING, DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD TODAY.
 
                                          Wells Fargo & Company
   
       , 1996     
 
- -------------------------------------------------------------------------------
 
                             D.F. KING & CO., INC.
                          77 Water Street, 20th Floor
                           New York, New York 10005
               Bankers and Brokers Call Collect: (212) 269-5550
                   All Others Call Toll-Free: 1-800-431-9646
 
- -------------------------------------------------------------------------------
 
                                      19
<PAGE>
 
                                    ANNEX A
 
          INFORMATION CONCERNING THE DIRECTORS AND EXECUTIVE OFFICERS
           
        OF WELLS FARGO AND OTHER EMPLOYEES AND REPRESENTATIVES OF     
                      WELLS FARGO WHO MAY SOLICIT PROXIES
 
  The following tables set 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 and other
representatives of Wells Fargo who may solicit proxies from Stockholders of
First Interstate.
 
                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,
 Arnelle, Hastie, McGee, Willis &   Hastie, McGee,
Greene                              
 1 Market Plaza                     Willis & Greene.
 Spear Street Tower, 39th Floor     
 San Francisco, California 94105    
                                    
William R. Breuner................  Director; Retired Chairman of the Board and
 The Moraga Professional Center     Chief Executive Officer of the John Breuner
 1042 Country Club Drive, Suite 2C  Company, retail and rental home and office
 Moraga, California 94556           furnishers.

William S. Davila.................  Director; President Emeritus of The Vons
 The Vons Companies, Inc.           Companies, Inc., a Los Angeles-based chain
 618 Michillinda Avenue             of supermarkets.
 Arcadia, California 91007

Rayburn S. Dezember...............  Director; Retired Chairman of the Board and
 5401 California Avenue             Chief Executive Officer of Central Pacific
 Bakersfield, California 93309      Corporation, a bank holding company.

Paul Hazen........................  Director; Chairman of the Board and Chief
                                    Executive Officer.
Robert K. Jaedicke................  Director; Professor (Emeritus) of
 Graduate School of Business, Room  Accounting and Former Dean of the Graduate
 289                                School of Business, Stanford University.
 Stanford University
 Stanford, California 94305

Ellen M. Newman...................  Director; President, Ellen Newman
                                    Associates, consumer relations consultants.
 Ellen Newman Associates
 323 Geary Street, Suite 507
 San Francisco, California 94102

Philip J. Quigley.................  Director; Chairman, President and Chief
 Pacific Telesis Group              Executive
                                    Officer of Pacific Telesis Group, a
 130 Kearney Street, 37th Floor     telephone holding
 San Francisco, California 94108    company.
                                    
Carl E. Reichardt.................  Director; Retired Chairman of the Board and
                                    Chief Executive Officer.
                                    Director; President and Chief Operating

Donald B. Rice....................  Officer of
 Teledyne, Inc.                     Teledyne, Inc., a diversified manufacturing
 2049 Century Park East, 15th       company.
 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, a cellular communications
 651 Gateway Boulevard, Suite 1500  company.
 South San Francisco, California    
 94080                               
                                    
Chang-Lin Tien....................  Director; Chancellor of the University of
 Office of the Chancellor           California,
 200 California Hall                Berkeley
 University of California           
 Berkeley, California 94720         
                                    
John A. Young.....................  Director; Retired President and Chief
 Hewlett-Packard Company            Executive Officer of Hewlett-Packard
 3200 Hillview Avenue               Company, a computer manufacturing concern.
 Palo Alto, California 94304

William F. Zuendt.................  Director; President and Chief Operating
Michael J. Gillfillan.............  Officer
Charles M. Johnson................  Vice Chairman
 2030 Main Street, Suite 900        Vice Chairman
 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
 343 Sansome Street                 Corporate
 San Francisco, California 94163    Communications
                                    Executive Vice President and Personnel

Patricia R. Callahan..............  Director
                                    Executive Vice President and General

Ross J. Kari......................  Auditor

Frank A. Moeslein.................  Executive Vice President and Controller
 343 Sansome Street
 San Francisco, California 94163

Guy Rounsaville, Jr...............  Executive Vice President, Chief Counsel and
                                    Secretary

Eric D. Shand.....................  Executive Vice President and Chief Loan
 111 Sutter Street                  Examiner
 San Francisco, California 94163
</TABLE>    
- --------
*  Unless otherwise indicated, the principal business address of each director
   and executive officer is Wells Fargo & Company, 420 Montgomery Street, San
   Francisco, California 94163.
 
                                      A-2
<PAGE>
 
   
  OTHER EMPLOYEES AND REPRESENTATIVES OF WELLS FARGO WHO MAY SOLICIT PROXIES
    
<TABLE>     
<CAPTION>
   NAME AND PRINCIPAL                       PRESENT OFFICE OR OTHER
   BUSINESS ADDRESS*                  PRINCIPAL OCCUPATION OR EMPLOYMENT
   ------------------           -----------------------------------------------
   <S>                          <C>
   Kim Kellogg................. Senior Vice President--Public Relations
    343 Sansome Street
    San Francisco, California
    94163

   Cynthia A. Koehn............ Vice President--Investor Relations
    343 Sansome Street
    San Francisco, California
    94163

   Scott A. Wilson............. Assistant Vice President--Investor Relations
    343 Sansome Street
    San Francisco, California
    94163

   Richard E. Thornburgh....... Chief Financial Officer, CS First Boston

   Michael E. Martin........... Managing Director, CS First Boston

   Mark S. Maron............... Managing Director, CS First Boston

   Olivier P. Sarkozy.......... Vice President, CS First Boston

   Andrew C. Rosenburgh........ Associate, CS First Boston

   J. Richard Fredericks....... Senior Managing Director, Montgomery Securities

   James C. Hale............... Managing Director, Montgomery Securities
</TABLE>    
- --------
* The principal business address of each representative of CS First Boston is
  CS First Boston Corporation, Park Avenue Plaza, 55 East 52nd Street, New
  York, New York 10055, and the principal business address of each
  representative of Montgomery Securities is 600 Montgomery Street, San
  Francisco, California 94111.
 
                                      A-3
<PAGE>
 
                                    ANNEX B
 
 SHARES 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 purchased 100 Shares on November 1, 1995 for $124 5/8 per share
(excluding mark-ups or commissions). As of January 16, 1996, Wells Fargo owned
beneficially 100 Shares. Additionally, as of January 11, 1996, Wells Fargo
held 162,751 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. With
respect to Shares held in a fiduciary capacity that Wells Fargo has the power
to vote and any vote taken with respect to the FIB/FBS Merger, Wells Fargo has
either relinquished such power to vote to an unaffiliated third party or will
abstain from any such vote.     
 
  Philip J. Quigley beneficially owns 500 Shares 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 from January 1, 1994, through September 30, 1995).
   
  Each of CS First Boston 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 ordinary course of their
business, CS First Boston and Montgomery Securities may actively trade the
securities of First Interstate for their own account and the accounts of their
customers and, accordingly, may at any time hold a long or short position in
such securities. As of January 8, 1996, CS First Boston held a net long
position of approximately 2,792 Shares, and Montgomery Securities held no
Shares. Neither CS First Boston nor Montgomery Securities admit that they or
any of their directors, officers, employees or affiliates are a "participant,"
as defined in Schedule 14A promulgated under the Exchange Act by the
Commission, in the solicitation to which this Proxy Statement relates or that
such Schedule 14A requires the disclosure in this Proxy Statement of certain
information concerning CS First Boston and Montgomery Securities.     
   
  Except as disclosed in this Proxy Statement, to the best knowledge of Wells
Fargo, none of Wells Fargo, its directors and executive officers or other
employees and representatives of Wells Fargo named in Annex A hereto has any
interest direct or indirect, by security holdings or otherwise, in First
Interstate.     
 
                                      B-1
<PAGE>
 
                                    ANNEX C
 
      SHARES HELD BY DIRECTORS AND EXECUTIVE OFFICERS OF FIRST INTERSTATE
 
  The following table sets forth as of February 21, 1995 (with the exception
of shares held in the Employee Savings Plan, which are reported as of December
31, 1994) the number of Shares beneficially owned by each director, the chief
executive officer and each of the four other most highly compensated executive
officers (and by all directors and executive officers as a group) of First
Interstate. The information contained in the table is derived from information
contained in the First Interstate Proxy Statement.
 
<TABLE>
<CAPTION>
                                                   AMOUNT AND NATURE
                                                     OF BENEFICIAL   PERCENT OF
                                                     OWNERSHIP OF    OUTSTANDING
NAME OF BENEFICIAL OWNER(1)                          SHARES(2)(3)      SHARES
- ---------------------------                        ----------------- -----------
<S>                                                <C>               <C>
John E. Bryson(4)(5)..............................         7,640          *
Edward M. Carson(4)(6)............................       255,394          *
Dr. Jewel Plummer Cobb............................         8,290          *
James J. Curran(6)(7).............................        86,641          *
Ralph P. Davidson.................................         9,500          *
Myron Du Bain(4)..................................        36,939          *
Don C. Frisbee....................................         3,872          *
Mary M. Gates(8)..................................         8,335          *
George M. Keller(4)...............................        10,896          *
William F. Kieschnick(4)..........................         8,100          *
Thomas L. Lee.....................................         6,300          *
Dr. William F. Miller(4)..........................        10,310          *
J.J. Pinola(4)....................................         8,842          *
William S. Randall(5)(6)..........................       115,940          *
Dr. Steven B. Sample..............................         7,000          *
Forrest N. Shumway(4).............................        10,000          *
William E. B. Siart(6)............................       215,004          *
Richard J. Stegemeier(4)..........................         7,800          *
Daniel M. Tellep..................................         7,500          *
Bruce G. Willison(5)(6)(7)........................       115,504          *
All directors and executive officers as a group
 (30 persons) (4)(5)(6)(7)(8)(9)(10)(11)..........     1,292,066        1.69%
</TABLE>
- --------
*   Represents less than 1% of the outstanding Shares.
(1) Subject to applicable community property and similar statutes, the persons
    listed as beneficial owners of the Shares have sole voting and investment
    power with respect to such shares except as noted.
(2) Fractional Shares resulting from participation in the Dividend
    Reinvestment and Stock Purchase Plan and the Employee Savings Plan of First
    Interstate Bancorp have been rounded to the nearest whole share.
(3) Includes the number of Shares that could be purchased by exercise of
    options presently exercisable, or exercisable within 60 days from February
    21, 1995, under First Interstate's stock option plans.
(4) Includes the following Shares held by a living or family trust formed by
    the named individual in which voting or investment power may be shared: Mr.
    Bryson, 500 Shares; Mr. Carson, 30,482 Shares; Mr. Du Bain, 23,839 Shares;
    Mr. Keller, 5,896 Shares; Mr. Kieschnick, 7,100 Shares; Dr. Miller, 2,310
    Shares; Mr. Pinola, 8,842 Shares; Mr. Shumway, 2,000 Shares; and Mr.
    Stegemeier, 4,800 Shares. Also includes 4,000 Shares held in an Individual
    Retirement Account by Mr. Du Bain.
(5) Includes Shares held jointly, or in other capacities, as to which in some
    cases beneficial ownership may be disclaimed.
  
                                      C-1
<PAGE>
 
(6) Includes the following shares held by the Trustee of the Employee Savings
  Plan in the accounts of the named individuals as of December 31, 1994:
 
<TABLE>
      <S>                                                                 <C>
      Edward M. Carson...................................................    801
      William E. B. Siart................................................ 16,527
      William S. Randall.................................................  9,830
      Bruce G. Willison..................................................  4,972
      James J. Curran.................................................... 13,338
      All executive officers as a group (15 persons)..................... 56,479
</TABLE>
 (7) Includes the following performance units awarded pursuant to the 1991,
   1992 and 1993 annual incentive plans and issued under the 1991 Performance
   Stock Plan (each performance stock unit represents a Share):
 
<TABLE>
      <S>                                                                  <C>
      Mr. Willison........................................................ 1,777
      Mr. Curran.......................................................... 1,543
      All executive officers as a group (15 persons)...................... 7,692
</TABLE>
 
  The performance stock units will be paid in Shares or cash upon the
  occurrence of certain events, at the executive officer's election,
  including the first to occur of termination of employment, retirement or a
  specified date. Additional performance unit credit will be received based
  on the value of dividends paid on the underlying performance stock units.
 (8) Mrs. Gates' stock ownership is reported as of June 9, 1994, the date of
     her death.
 (9) Includes 97,213 Shares held in living or family trusts in which voting or
     investment power may be shared.
(10) No directors or executive officers of First Interstate owned any shares
     of Series F or Series G Preferred Stock of the Corporation.
(11) Includes shares of Restricted Stock awarded by the Compensation Committee
     pursuant to the First Interstate's 1991 Performance Stock Plan.
 
                                      C-2
<PAGE>
 
                    PRELIMINARY COPY--SUBJECT TO COMPLETION
 
                           [FORM OF PROXY CARD-WHITE]
 
 
                    PROXY SOLICITED BY WELLS FARGO & COMPANY
    IN OPPOSITION TO THE PROXY SOLICITED BY THE BOARD OF DIRECTORS OF FIRST
                               INTERSTATE BANCORP
       
      Unless otherwise specified below, the undersigned, a holder of
    record of shares of Common Stock, par value $2.00 per share (the
    "Shares"), of First Interstate Bancorp ("First Interstate") on
    January 10, 1996 (the "Record Date"), hereby appoints Paul Hazen or
    William F. Zuendt, or either of them, the proxy or proxies of the
    undersigned, each with full power of substitution, to attend the
    Special Meeting of Stockholders of First Interstate to be held on
               , 1996 at which holders of Shares will be voting on
    approval and adoption of the Agreement and Plan of Merger, dated as
    of November 5, 1995, by and among First Bank System, Inc., Eleven
    Acquisition Corp., and First Interstate (the "FIB/FBS Merger
    Agreement"), and at any adjournments, postponements or reschedulings
    thereof, and to vote as specified in this Proxy all the Shares which
    the undersigned would otherwise be entitled to vote if personally
    present. The undersigned hereby revokes any previous proxies with
    respect to the matters covered in this proxy:     
 
     WELLS FARGO RECOMMENDS A VOTE AGAINST APPROVAL AND ADOPTION OF THE
                          FIB/FBS MERGER AGREEMENT.
 
         (IF RETURNED CARDS ARE SIGNED AND DATED BUT NOT MARKED, THE
        UNDERSIGNED WILL BE DEEMED TO HAVE VOTED AGAINST APPROVAL AND
                 ADOPTION OF THE FIB/FBS MERGER AGREEMENT.)
 
    1. Approval and adoption of the FIB/FBS Merger Agreement.
 
                 [_] AGAINST       [_] ABSTAIN       [_] FOR
 
    2. In their discretion, the Proxies are authorized to vote upon such
       other business as may properly come before the meeting.
 
      IF YOU HAVE ANY QUESTIONS OR NEED ASSISTANCE, PLEASE CONTACT D.F.
    KING & CO., INC. AT (800) 431-9646
 
      Proxies can only be given by Stockholders of record on the Record
    Date. Please sign your name below exactly as it appears on your
    stock certificate(s) on the Record Date or on the label affixed
    hereto. When Shares are held of record by joint tenants, both should
    sign. When signing as attorney, executor, administrator, trustee or
    guardian, please give full title as such. If a corporation, please
    sign in full corporate name by president or authorized officer. If a
    partnership, please sign in partnership name by authorized person.
 
                                          Dated: _________________ , 1996
 
                                          -------------------------------
                                             Signature (Title, if any)
 
                                          -------------------------------
                                             Signature if held jointly
 
    PLEASE SIGN, DATE AND RETURN PROXY PROMPTLY IN THE ENCLOSED POSTAGE-
                               PAID ENVELOPE.
 


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